1. The central traction device comprises a traction pin base, a traction pull rod symmetrically arranged on the traction pin base, a central traction spherical hinge pressed in the traction pin base, a central pin pressed in the central traction spherical hinge in a conical surface fit manner and a locking bolt used for axially locking the central pin and the central traction spherical hinge, and is characterized in that: the central traction spherical hinge is axially positioned in the traction pin seat, the lower end of the central traction spherical hinge is sealed by a stop block, and the stop block is pressed and abutted against the central traction spherical hinge and the central pin along the axial direction through a locking bolt.

2. The central pulling apparatus of claim 1, wherein: the central traction spherical hinge comprises an inner sleeve matched with the central pin, an outer sleeve matched with the traction pin base and a rubber layer vulcanized between the inner sleeve and the outer sleeve, and the step that the central traction spherical hinge is axially positioned in the traction pin base means that: the end faces of the two ends of the outer sleeve are respectively abutted against the traction pin seat, so that the outer sleeve is positioned in the traction pin seat.

3. The central pulling apparatus of claim 2, wherein: the lower end of the inner wall of the traction pin base is provided with a lower retaining ring which is abutted against the lower end face of the outer sleeve, an upper retaining ring which is abutted against the upper end face of the outer sleeve is fixed on the traction pin base, the upper retaining ring is in a right-angle flanging shape and is fixedly attached to the upper end of the traction pin base, and the lower end of the upper retaining ring is abutted against the upper end face of the outer sleeve.

4. The central pulling apparatus of claim 1, wherein: the inner sleeve comprises a conical surface section matched with the conical surface of the center pin and a connecting section integrally formed below the conical surface section, one end of the center pin is pressed into the conical surface section, and the stop block extends into the connecting section from the lower end of the inner sleeve and abuts against the lower end surface of the inner sleeve and the lower end surface of the center pin respectively to seal the connecting section.

5. The central pulling apparatus of claim 4, wherein: the stop block is formed by integrally forming a baffle plate and a pressing block, the baffle plate abuts against the lower end face of the inner sleeve, the pressing block extends into the connecting section and abuts against the lower end face of the center pin, the locking bolt penetrates through the stop block in a threaded fit mode and is screwed into the center pin, and the head of the locking bolt compresses the baffle plate.

6. The central pulling apparatus of claim 4, wherein: the inner wall of the connecting section is provided with an internal thread, the inner end of the internal thread is provided with a circumferential step surface, and the circumferential step surface is positioned below the lower end surface of the center pin.

7. The central pulling apparatus of claim 5, wherein: the conical surface section is connected with the rubber layer in a vulcanization mode, the connecting section is not connected with the rubber layer in a vulcanization mode and extends out of the lower end of the traction pin seat, a circumferential notch is formed in the connecting section, the pressing block fills the circumferential notch to enable the inner sleeve and the stop block to be circumferentially positioned, and a rubber sealing gasket in contact with the lower end face of the inner sleeve is laid on the inner face of the baffle plate.

8. The method of splitting a central pulling apparatus as set forth in any one of claims 1 to 7, wherein: the locking bolt and the stop block are firstly detached, then the central traction spherical hinge is coaxially connected with the force application oil cylinder, and then the force application oil cylinder applies axial pressure to the central pin to press the central pin out of the central traction spherical hinge.

9. The method for splitting a central traction device according to claim 8, wherein: the design connecting cylinder, the outer wall and the linkage segment inner wall screw-thread fit of connecting cylinder, inner wall and application of force hydro-cylinder tip screw-thread fit, "pull down locking bolt and dog earlier and pull ball pivot and application of force hydro-cylinder coaxial coupling with the center" specifically mean:

firstly, screwing out the locking bolt to be separated from the central pin and the stop block; then taking the stop block out of the connecting section of the inner sleeve; then adding a cushion block on the lower end face of the center pin; then, the connecting cylinder is in threaded fit with the connecting section until the end face of the connecting cylinder is abutted against the annular step face; and finally, matching the end part of the force application oil cylinder with the connecting cylinder through threads to realize the coaxial connection of the central traction spherical hinge inner sleeve and the force application oil cylinder.

10. The method for splitting a central traction device according to claim 9, wherein: the step of applying axial pressure to the center pin by using the force application oil cylinder to press the center pin out of the center traction spherical hinge specifically comprises the following steps: and starting the force application oil cylinder, enabling a telescopic rod of the force application oil cylinder to extend to abut against the cushion block, and transmitting axial pressure to the center pin through the cushion block to press the center pin out of the center traction spherical hinge inner sleeve.

Background

The central traction device is arranged between a railway vehicle body and a bogie and is used for connecting the vehicle body and the bogie, transmitting traction force and braking force and simultaneously buffering impact and vibration caused by wheels. The central traction device comprises a traction pin seat, a central traction spherical hinge and a central pin. The center pin is a connecting piece for connecting the vehicle body and the center traction device and is used for transmitting traction force and braking force. The central traction ball hinge is arranged in the traction pin seat and is connected with the traction pin seat and the central pin to transmit traction force and braking force. In the prior art, the following technical problems exist:

1. the central traction device consists of a traction pin seat and a central traction spherical hinge, and the original structure is easy to axially move.

2. The central pin and the traction pin seat are matched by adopting a conical surface. When the car body and the bogie are separated, the center pin and the traction pin seat are required to be separated, and the disassembly is very difficult due to limited space.

3. The sand and stone at the bottom impact the product, which affects the service life.

The relevant patent documents retrieved are:

a locomotive traction device with a center pin and a Z-shaped pull rod comprises a CN200620036147.7, wherein a traction pin is arranged at the bottom of a locomotive, a traction pin seat is sleeved on the traction pin, traction pull rods are respectively arranged at two ends of the traction pin seat, the two traction pull rods and the traction pin seat are arranged in a Z shape, the traction pull rods are hinged with the traction pin seat through elastic joints, the other end of each traction pull rod is connected with a traction pull rod seat on a bogie beam, and elastic elements are further arranged on the traction pin and the traction pin seat.

CN200820072618.9, a bogie central traction device without abrasion structure, mainly comprising a center pin, a traction beam, a traction pull rod and a center pin sleeve, wherein the center pin sleeve is pressed in a center cylinder of the traction beam, the center pin and the center pin sleeve are concentrically assembled, the center pin and the center pin sleeve are in taper fit, the traction pull rod is arranged on the left side and the right side of the center cylinder of the traction beam, the length direction of the traction pull rod is vertically arranged with the length direction of the traction beam to form a Z-shaped structure, the bogie central traction device is characterized in that the center pin sleeve adopts a vulcanization structure of metal and rubber, and the center pin adopts a hollow casting structure.

The central traction device of the monorail car comprises a central pin, a central traction spherical hinge and a traction pin seat, wherein the central traction spherical hinge is arranged in the traction pin seat, the central pin is connected with the central traction spherical hinge, the central pin is inserted into the central traction spherical hinge from top to bottom, and the central pin and the central traction spherical hinge are in locking connection with a locking nut through a second bolt; the central traction spherical hinge comprises an inner sleeve, the top surface of the central pin is provided with a second backing plate, the upper end of the second bolt penetrates through the central traction spherical hinge, the central pin and the second backing plate from bottom to top and then is connected with the locking nut, and the lower end of the second bolt is fixedly connected with the lower end of the inner sleeve of the central traction spherical hinge.

Disclosure of Invention

The central traction device and the splitting method thereof provided by the invention limit the axial movement of the central traction ball hinge in the traction pin seat, avoid the accelerated aging caused by repeatedly pulling the rubber layer in the ball hinge due to the movement of the central traction ball hinge, improve the structural stability of the whole device and prolong the service life, can effectively prevent sand and stone from entering from the lower end of the central traction ball hinge to improve the adaptability of the central traction device to severe working conditions, improve the splitting efficiency, reduce the splitting difficulty and have higher practicability.

In order to achieve the purpose, the invention adopts the technical scheme that:

the central traction device comprises a traction pin base, a traction pull rod symmetrically arranged on the traction pin base, a central traction spherical hinge pressed in the traction pin base, a central pin pressed in the central traction spherical hinge in a conical surface fit manner and a locking bolt used for axially locking the central pin and the central traction spherical hinge, and is characterized in that: the central traction spherical hinge is axially positioned in the traction pin seat, the lower end of the central traction spherical hinge is sealed by a stop block, and the stop block is pressed and abutted against the central traction spherical hinge and the central pin along the axial direction through a locking bolt.

Preferably, the central traction spherical hinge comprises an inner sleeve matched with the central pin, an outer sleeve matched with the traction pin base and a rubber layer vulcanized between the inner sleeve and the outer sleeve, and the "axial positioning of the central traction spherical hinge in the traction pin base" means that: the end faces of the two ends of the outer sleeve are respectively abutted against the traction pin seat, so that the outer sleeve is positioned in the traction pin seat.

Preferably, the lower end of the inner wall of the traction pin base is provided with a lower retaining ring which is abutted against the lower end face of the outer sleeve, the traction pin base is fixedly provided with an upper retaining ring which is abutted against the upper end face of the outer sleeve, the upper retaining ring is in a right-angle flanging shape and is fixedly attached to the upper end of the traction pin base, and the lower end of the upper retaining ring is abutted against the upper end face of the outer sleeve.

Preferably, the inner sleeve comprises a conical surface section matched with the conical surface of the center pin and a connecting section integrally formed below the conical surface section, one end of the center pin is pressed into the conical surface section, and the stop block extends into the connecting section from the lower end of the inner sleeve and abuts against the lower end surface of the inner sleeve and the lower end surface of the center pin respectively to seal the connecting section.

Preferably, the stop block is formed by integrally forming a baffle plate and a pressing block, the baffle plate abuts against the lower end face of the inner sleeve, the pressing block extends into the connecting section and abuts against the lower end face of the center pin, the locking bolt penetrates through the stop block in a threaded fit mode and is screwed into the center pin, and the head of the locking bolt presses the stop block.

Preferably, the inner wall of the connecting section is provided with an internal thread, the inner end of the internal thread is provided with a circumferential step surface, and the circumferential step surface is positioned below the lower end surface of the center pin.

Preferably, the conical surface section is connected with the rubber layer in a vulcanization mode, the connecting section is not connected with the rubber layer in a vulcanization mode and extends out of the lower end of the traction pin base, a circumferential notch is formed in the connecting section, the pressing block fills the circumferential notch to enable the inner sleeve and the stop block to be circumferentially positioned, and a rubber sealing gasket in contact with the lower end face of the inner sleeve is laid on the inner face of the baffle plate.

The method for splitting the central traction device is characterized in that: the locking bolt and the stop block are firstly detached, then the central traction spherical hinge is coaxially connected with the force application oil cylinder, and then the force application oil cylinder applies axial pressure to the central pin to press the central pin out of the central traction spherical hinge.

Preferably, the design connecting cylinder, the outer wall and the linkage segment inner wall screw-thread fit of connecting cylinder, inner wall and application of force hydro-cylinder tip screw-thread fit, "pull down locking bolt and dog earlier and pull ball pivot and application of force hydro-cylinder coaxial coupling with the center" specifically mean:

firstly, screwing out the locking bolt to be separated from the central pin and the stop block; then taking the stop block out of the connecting section of the inner sleeve; then adding a cushion block on the lower end face of the center pin; then, the connecting cylinder is in threaded fit with the connecting section until the end face of the connecting cylinder is abutted against the annular step face; and finally, matching the end part of the force application oil cylinder with the connecting cylinder through threads to realize the coaxial connection of the central traction spherical hinge inner sleeve and the force application oil cylinder.

Preferably, the step of applying axial pressure to the center pin by using the force application oil cylinder to press the center pin out of the center traction ball joint specifically includes: and starting the force application oil cylinder, enabling a telescopic rod of the force application oil cylinder to extend to abut against the cushion block, and transmitting axial pressure to the center pin through the cushion block to press the center pin out of the center traction spherical hinge inner sleeve.

The invention has the beneficial effects that:

1. the central traction device limits the axial movement of the central traction ball hinge in the traction pin seat through the axial positioning of the traction pin seat and the central traction ball hinge, avoids the accelerated aging caused by the repeated pulling of the rubber layer in the ball hinge due to the movement of the central traction ball hinge, improves the structural stability of the whole device and prolongs the service life.

2. The lower end of the central traction spherical hinge is sealed by the stop block, so that sand and stones can be effectively prevented from entering the lower end of the central traction spherical hinge to form abrasion on the matching conical surface of the central traction spherical hinge and the central pin, the adaptability of the central traction device to severe working conditions is improved, and the reliability of the assembling structure of the central traction spherical hinge and the central pin is ensured, so that the service life is prolonged.

3. The connecting section of the inner sleeve of the central traction spherical hinge extends out of the lower end of the traction pin base to provide an extending space for the stop dog, a circumferential notch is formed in the connecting section, a filling block corresponding to the circumferential notch is arranged on the baffle plate, the filling block is filled in the circumferential notch to circumferentially position the inner sleeve and the stop dog, the locking bolt penetrates through the stop dog in a threaded fit mode and is screwed into the center pin, looseness of the locking bolt is effectively prevented through circumferential positioning of the inner sleeve and the stop dog, sealing reliability of the stop dog on the lower end of the central traction spherical hinge is guaranteed, locking reliability of the locking bolt on the central traction spherical hinge and the center pin is also guaranteed, and structural reliability of the whole device is improved.

4. Set up the internal thread on the inner wall of linkage segment, realize the center through the internal thread when split center pulls ball pivot and core pin that the coaxial coupling of ball pivot and application of force hydro-cylinder is pulled to pressurization through application of force hydro-cylinder realizes both splits fast, improves split efficiency between them, reduces the split degree of difficulty, improves the practicality of whole device.

Drawings

FIG. 1 is a schematic view of a center draft gear of the present invention.

Fig. 2 is a schematic view of a central traction ball joint.

Fig. 3 is an exploded schematic view of the attachment section, locking bolt and stop assembly.

Fig. 4 is a schematic structural view of the stopper.

FIG. 5 is an exploded view of the coaxial alignment of the central traction device, connector barrel, pad and force applying cylinder.

Detailed Description

Embodiments of the present invention will be described in detail with reference to fig. 1 to 5.

The central traction device comprises a traction pin base 1, a traction pull rod symmetrically installed on the traction pin base 1, a central traction spherical hinge 2 pressed in the traction pin base 1, a central pin 3 pressed in the central traction spherical hinge 2 in a conical surface fit manner, and a locking bolt 4 used for axially locking the central pin 3 and the central traction spherical hinge 2, and is characterized in that: the central traction spherical hinge 2 is axially positioned in the traction pin base 1, the lower end of the central traction spherical hinge 2 is sealed by a stop block 5, and the stop block 5 is pressed and propped against the central traction spherical hinge 2 and the central pin 3 along the axial direction through a locking bolt 4.

In the central traction device, the central traction ball joint 2 is limited to axially move in the traction pin seat 1 through the axial positioning of the traction pin seat 1 and the central traction ball joint 2, so that the phenomenon that a rubber layer in the ball joint is repeatedly pulled due to the movement of the central traction ball joint 1 to accelerate aging is avoided, the structural stability of the whole device is improved, and the service life is prolonged. The lower end of the central traction spherical hinge 2 is sealed by the stop block 5, so that sand and stones can be effectively prevented from entering the matching conical surfaces of the central traction spherical hinge 2 and the central pin 3 from the lower end of the central traction spherical hinge 2 to form abrasion, the severe working condition adaptability of the central traction device is improved, and the reliability of the assembling structure of the central traction spherical hinge and the central pin is ensured, so that the service life is prolonged.

Wherein, the central traction spherical hinge 2 comprises an inner sleeve 21 matched with the central pin 3, an outer sleeve 22 matched with the traction pin base 1 and a rubber layer vulcanized between the inner sleeve and the outer sleeve, and the axial positioning of the central traction spherical hinge 2 in the traction pin base 1 means that: the end faces of the outer sleeve 22 are respectively abutted against the traction pin base 1, so that the outer sleeve 22 is positioned in the traction pin base 1. The center pin 3 is connected with a vehicle body, the inner sleeve 21 is matched with the conical surface of the center pin 3 and axially locked through the locking bolt 4, the inner sleeve 21 cannot move, and the outer sleeve 22 is easy to move, so that two ends of the outer sleeve 22 are respectively abutted against the traction pin base 1, the outer sleeve 22 is positioned in the traction pin base 1, the outer sleeve 22 can be effectively prevented from moving, the rubber layer is prevented from being repeatedly pulled due to the movement of the outer sleeve 22, and the service life is prolonged.

The lower end of the inner wall of the traction pin base 1 is provided with a lower retaining ring 11 which is abutted against the lower end face of the outer sleeve 22, the traction pin base 1 is fixedly provided with an upper retaining ring 12 which is abutted against the upper end face of the outer sleeve 22, the upper retaining ring 12 is in a right-angle flanging shape and is fixedly attached to the upper end of the traction pin base, and the lower end of the upper retaining ring 12 is abutted against the upper end face of the outer sleeve 22. The lower baffle ring 11 and the traction pin base 11 are integrally formed, when the ball hinge 2 is pulled by a press-fitting center, the lower baffle ring 11 is in contact with the lower baffle ring 11, namely, the lower baffle ring is in press-fitting in place, the upper baffle ring 12 is fixedly attached to the traction pin base 1 and is in a right-angle flanging shape, the upper flanging and the traction pin base 1 are fixed through bolts, the lower end of the upper flanging is abutted to the upper end face of the outer sleeve 22, and the outer sleeve 22 is axially positioned in the traction pin base 1. The upper baffle ring 12 is convenient and simple to install, and is convenient for realizing the axial positioning of the central traction spherical hinge 2. And the upper retaining ring 12 is tightly pressed on the central traction spherical hinge 2 through the pretightening force of the bolt after being installed in place, so that the circumferential slipping rotation of the central traction spherical hinge in the traction pin seat can be effectively limited, the structural reliability is improved, the central traction spherical hinge and the traction pin seat can be assembled by small interference fit or clearance fit, and the assembly is more convenient and simpler.

The inner sleeve 21 comprises a conical surface section 211 matched with the conical surface of the central pin 3 and a connecting section 212 integrally formed below the conical surface section, one end of the central pin 3 is pressed into the conical surface section 211, and the stop block 5 extends into the connecting section 212 from the lower end of the inner sleeve 21 and abuts against the lower end surface of the inner sleeve 21 and the lower end surface of the central pin 3 respectively to seal the connecting section 212. The inner cavity of the connecting section 212 is used as a containing cavity of the stop block 5, when the locking bolt 4 is screwed in, the stop block 5 is abutted against the lower end of the inner sleeve 21, the central pin 3 is pulled to be pressed into the inner sleeve 21 to form conical fit with the inner sleeve 21, the screwing in of the locking bolt provides strong axial tension for the central pin to be pressed into the conical surface of the inner sleeve 21, the central pin 3 and the central traction ball hinge 2 are axially locked, the arrangement of the stop block 5 can also effectively prevent the locking bolt 4 from being loosened, and the structural stability is improved.

The stop block 5 is formed by integrally molding a stop plate 51 and a pressing block 52, the stop plate 51 abuts against the lower end face of the inner sleeve 21, the pressing block 52 extends into the connecting section 212 and abuts against the lower end face of the center pin 3, the locking bolt 4 penetrates through the stop block 5 in a threaded fit manner and is screwed into the center pin 3, and the head of the locking bolt 4 presses the stop plate 51. As shown in the figure, the baffle 51 abuts against the lower end of the inner sleeve 21, the pressing block 52 extends into the connecting section 212 and abuts against the lower end of the center pin 3, the connecting section 212 is sealed through the baffle 51 to prevent sand from entering, the center pin 3 and the inner sleeve 22 form a stable-structure whole through the matching of the stop block 5 and the locking bolt 4, and the structural stability and the reliability are higher.

The inner wall of the connecting section 212 is provided with an internal thread, the inner end of the internal thread is provided with a circumferential stepped surface 213, and the circumferential stepped surface 213 is positioned below the lower end surface of the center pin 3. When the ball hinge 2 and the center pin 3 are drawn at the splitting center, the coaxial connection of the center-drawn ball hinge 2 and the force application oil cylinder is realized through the internal thread, so that the splitting between the ball hinge 2 and the force application oil cylinder can be quickly realized through the pressurization of the force application oil cylinder, the splitting efficiency between the ball hinge and the force application oil cylinder is improved, the splitting difficulty is reduced, and the practicability of the whole device is improved. The annular step surface 213 axially positions the coaxially connected connecting piece, and when the connecting piece contacts the annular step surface 213, the connecting piece is installed in place, so that the operability of coaxial connection of the central traction spherical hinge 2 and the force application oil cylinder is improved.

Wherein, the conical surface section 211 is connected with the rubber layer by vulcanization, the connecting section 212 is not connected with the rubber layer by vulcanization and extends out from the lower end of the traction pin base 1, the connecting section 212 is provided with a circumferential gap 214, the pressing block 52 fills the circumferential gap 214 to circumferentially position the inner sleeve 21 and the stop block 5, a rubber gasket 511 which is contacted with the lower end surface of the inner sleeve 21 is laid on the inner surface of the baffle plate 51, a rubber gasket 511 is added, the sealing can be realized by pressing the rubber gasket 511 during installation, water is prevented from entering the thread on the inner wall of the internal corrosion connecting section 212, the sealing reliability is high, the locking bolt 4 passes through the stop block 5 in a thread fit way and is screwed into the central pin 3, the locking bolt 4 is effectively prevented from loosening by the circumferential positioning of the inner sleeve 21 and the stop block 5, namely the sealing reliability of the stop block 5 to the lower end of the central traction ball hinge 2 is ensured, and the locking reliability of the locking bolt 4 to the central traction ball hinge 2 and the central pin 3 is also ensured, the structural reliability of the whole device is improved.

The method for splitting the central traction device is characterized in that: firstly, the locking bolt 4 and the stop block 5 are dismounted, then the central traction spherical hinge 2 is coaxially connected with the force application oil cylinder 7, and then the force application oil cylinder 7 is used for applying axial pressure to the central pin 3 to extrude the central pin out of the central traction spherical hinge. Through the coaxial coupling of central traction ball pivot 2 and application of force hydro-cylinder, guarantee that the effort of application of force hydro-cylinder is along the central pin axis effect, pull 3 extrusion from central traction ball pivot 2 with the central pin, through the pressurization of application of force hydro-cylinder realize fast splitting of central pin 3 and central traction ball pivot 2 fast, improve split efficiency between them, reduce the split degree of difficulty, improve the maneuverability of dividing the book.

Wherein, design connecting cylinder 6, the outer wall and the linkage segment 212 inner wall screw-thread fit of connecting cylinder 6, inner wall and the cooperation of application of force hydro-cylinder 7 tip screw-thread, "pull down locking bolt 4 and dog 5 earlier and pull ball pivot 2 and application of force hydro-cylinder 7 coaxial coupling with the center" specifically mean:

firstly, screwing out the locking bolt 4 to be separated from the central pin 3 and the stop block 5; then the block 5 is taken out from the connecting section 212 of the inner sleeve; then adding a cushion block 8 on the lower end face of the central pin 3; then, the connecting cylinder 6 is in threaded fit with the connecting section 212 until the end face of the connecting cylinder 6 abuts against the annular step face 213; and finally, matching the end part of the force application oil cylinder with the connecting cylinder 6 in a threaded manner to realize the coaxial connection of the central traction spherical hinge inner sleeve and the force application oil cylinder. Internal thread on the inner wall of the connecting section 212 is in threaded fit with the outer wall of the connecting cylinder 6, threads on the inner wall of the connecting cylinder 6 are in threaded fit with the end part of the force application oil cylinder, the connecting section 212, the connecting cylinder 6 and the force application oil cylinder 7 are coaxially connected into a whole, the action force of the force application oil cylinder is ensured to act along the central axis of the center pin, the folding and splitting safety and reliability are improved, and the center pin 3 and the center traction ball hinge 2 are prevented from being damaged during splitting.

Wherein, the step of applying axial pressure to the central pin 3 by the force application oil cylinder 7 to press the central pin 3 out of the central traction spherical hinge specifically means that: and starting the force application oil cylinder 7, enabling a telescopic rod of the force application oil cylinder 7 to extend to abut against the cushion block 8, and transmitting axial pressure to the central pin 3 through the cushion block 8 to press the central pin out of the central traction spherical hinge inner sleeve. The telescopic rod of the force application oil cylinder 7 acts on the cushion block, so that the lower end face of the center pin 3 is uniformly pressed, the pressure deflection of the force application oil pressure 7 is effectively avoided, and the detachment safety is further improved.

The technical solutions of the embodiments of the present invention are fully described above with reference to the accompanying drawings, and it should be noted that the described embodiments are only some embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.