1. A quick locking tractor for a trailer comprises a cast steel shell (1), and is characterized in that a ball cavity (2) and a mounting groove (3) which are communicated with each other are respectively formed in two sides of the bottom end of the cast steel shell (1), an adjustable adjusting bolt (4) is arranged inside the ball cavity (2), two ends of the adjusting bolt (4) penetrate through the ball cavity (2) and the cast steel shell (1), a limiting structure (5) is arranged at the top end of the cast steel shell (1), a locking assembly (6) is arranged at the top end of the limiting structure (5), an elastic structure (7) is arranged on the surface of the locking assembly (6), and the bottom end of the locking assembly (6) penetrates through the limiting structure (5), the cast steel shell (1), the mounting groove (3) and the ball cavity (2) in sequence and is in contact with the adjusting bolt (4);

locking Assembly (6) are including upgrading interior piece (601), the bottom of upgrading interior piece (601) is provided with pull rod (602), interior piece (601) and limit structure (5) are run through to the top of pull rod (602).

2. The quick locking retractor for the trailer according to claim 1, wherein the limiting structure (5) comprises two slope lifting sleeves (501), the two slope lifting sleeves (501) are both in a step shape, the two slope lifting sleeves (501) are connected end to end, the two slope lifting sleeves (501) are mounted at the top end of the cast steel shell (1), a limiting opening (502) is arranged at the side of the slope lifting sleeve (501) with the higher height, and two clamping rods (503) matched with the limiting opening (502) are fixedly connected to the surface of the pull rod (602).

3. The quick lock retractor for a trailer of claim 1 wherein a removable aluminum die cast knob (603) is mounted on top of the tie rod (602), the upper surface of the aluminum die cast knob (603) being provided with a resistance increasing layer (604).

4. The quick locking retractor for trailer of claim 3 wherein the cast steel housing (1) has a stop (101) fixedly attached to its top end and the aluminum die-cast knob (603) has two stop rods (605) fixedly attached to its lower surface.

5. The quick locking retractor for trailers of claim 1, wherein the inner bottom wall of the mounting groove (3) is fixedly connected with a limit plate (301) attached to the inner upgrading block (601), and the inclination of the limit plate (301) is identical to the inclination of the pull rod (602).

6. The quick-locking retractor for trailers of claim 1 wherein both sides of the upgraded inner block (601) are provided with contact surfaces (606), the radius of curvature of the contact surface (606) close to the limiting plate (301) being greater than the radius of curvature of the contact surface (606) on the other side.

7. The quick locking retractor for a trailer according to claim 1 wherein the bottom end of the inner upgrading block (601) is provided with a limiting surface (607), and the inner wall of the limiting surface (607) is attached to the upper surface of the adjusting bolt (4).

8. The tractor for locking trailer of claim 1, wherein the cast steel housing (1) has mounting holes (102) formed on its surface for uniformly distributing and communicating with the mounting groove (3), and the cast steel housing (1) has circular-arc-shaped notches (103) formed on its top and bottom ends, and the notches (103) communicate with the mounting groove (3).

9. The quick locking retractor for the trailer according to claim 1, wherein a first circular hole (608) is formed at the top end of the upgrading inner block (601), a second circular hole (609) communicated with the first circular hole (608) is formed at the bottom end of the upgrading inner block (601), the diameter of the second circular hole (609) is larger than that of the first circular hole (608), the pull rod (602) is inserted into the first circular hole (608), a dismounting bolt (610) is arranged on the inner top wall of the second circular hole (609), the top end of the dismounting bolt (610) penetrates through the second circular hole (609) and is connected with the pull rod (602), and a strip-shaped groove (611) is formed at the bottom end of the dismounting bolt (610).

10. The quick-locking retractor for a trailer according to claim 1, wherein the elastic structure (7) comprises a bottom sleeve gasket ring (701), the bottom sleeve gasket ring (701) is sleeved on the surface of the pull rod (602), a snap spring is arranged on the surface of the pull rod (602), a compression spring (702) is arranged at the upper end of the snap spring, and the top end of the compression spring (702) is connected with the bottom sleeve gasket ring (701).

Background

Trailer tractors are important devices mounted on the front of a trailer and are the connection between the trailer ball and the trailer at the rear of the towing vehicle. When dragging, the trailer tractor locks the towing ball head in the ball cavity, thus connecting the trailer with the towing vehicle in front. One key point in the design of the retractor is that the ball lock cannot be pulled out while in the ball cavity. The required tension is pulled out, dividing the load rating of the tractor.

Through retrieval, the chinese patent discloses an anti-loose locking device for automobile traction (publication number CN110641235A), which utilizes the structural cooperation of a clamping lever, a handle lever, a connecting lever and a connecting bracket to form a locking mechanism, the locking mechanism can be located at a dead point position by using the lever principle of a hinge four-bar mechanism, but when the locking mechanism is located at the dead point position, the safety locking block is locked on the poking rod to ensure that the locking mechanism cannot act at the dead point position, and then the safety bolt is inserted, so that the locking and separating operation is troublesome, the parts are many, the assembly is difficult, and the load level is low, and the locking mechanism cannot be installed on a large trailer for use

Disclosure of Invention

In view of the above technical problems, the embodiment of the present invention provides a quick locking retractor for a trailer.

The first aspect of the embodiment of the invention provides a quick locking tractor for a trailer, which comprises a cast steel shell, wherein a ball cavity and a mounting groove which are mutually communicated are respectively formed in two sides of the bottom end of the cast steel shell, an adjustable adjusting bolt is arranged in the ball cavity, two ends of the adjusting bolt penetrate through the ball cavity and the cast steel shell, a limiting structure is arranged at the top end of the cast steel shell, a locking component is arranged at the top end of the limiting structure, an elastic structure is arranged on the surface of the locking component, and the bottom end of the locking component penetrates through the limiting structure, the cast steel shell, the mounting groove and the ball cavity in sequence and is in contact with the adjusting bolt;

the locking assembly comprises an upgrading inner block, a pull rod is arranged at the bottom end of the upgrading inner block, and the top end of the pull rod penetrates through the upgrading inner block and the limiting structure.

In an embodiment, the limiting structure includes two slope lifting sleeves, the two slope lifting sleeves are both in a step shape, the two slope lifting sleeves are connected end to end, the two slope lifting sleeves are mounted at the top end of the cast steel shell, a limiting opening is formed in one side of the slope lifting sleeve with the higher height, and two clamping rods matched with the limiting opening are fixedly connected to the surface of the pull rod.

In one embodiment, the top end of the pull rod is provided with a detachable aluminum die-casting knob, and the upper surface of the aluminum die-casting knob is provided with a resistance increasing layer.

In one embodiment, a stop block is fixedly connected to the top end of the cast steel shell, and two stop rods are fixedly connected to the lower end of the surface of the aluminum die-cast knob.

In one embodiment, the inner bottom wall of the installation groove is fixedly connected with a limiting plate attached to the upgrading inner block, and the inclination of the limiting plate is consistent with that of the pull rod.

In one embodiment, both sides of the upgrading inner block are provided with contact surfaces, and the curvature radius of the contact surface close to the limiting plate is larger than that of the contact surface on the other side.

In one embodiment, the bottom end of the upgrading inner block is provided with a limiting surface, and the inner wall of the limiting surface is attached to the upper surface of the adjusting bolt.

In one embodiment, the surface of the cast steel shell is provided with mounting holes which are uniformly distributed and communicated with the mounting groove, and the top end and the bottom end of the cast steel shell are provided with circular arc-shaped gaps which are communicated with the mounting groove.

In an embodiment, first circular port has been seted up on the top of upgrading inner block, the second circular port that is linked together with first circular port is seted up to the bottom of upgrading inner block, the diameter of second circular port is greater than the diameter of first circular port, the pull rod peg graft in first circular port, the interior roof of second circular port sets up dismantlement bolt, the top of dismantling the bolt runs through the second circular port and is connected with the pull rod, the bar groove has been seted up to the bottom of dismantling the bolt.

In an embodiment, the elastic structure includes a bottom sleeve gasket ring, the bottom sleeve gasket ring is sleeved on the surface of the pull rod, a snap spring is arranged on the surface of the pull rod, a pressure spring is arranged at the upper end of the snap spring, and the top end of the pressure spring is connected with the bottom sleeve gasket ring.

According to the technical scheme provided by the embodiment of the invention, the locking assembly is rotated downwards, under the action of the limiting structure, the bottom sleeve gasket ring is contacted with the inner top wall of the cast steel shell, the pressure spring has a downward force, so that the clamp spring drives the pull rod to move downwards, the contact between the inner block and the adjusting bolt is upgraded, the ball head is effectively locked, under the action of the pressure spring, the clamp spring and the bottom sleeve gasket ring, the locking assembly is not easy to loosen, the operation is convenient, the rapid locking of equipment can be realized, the structural layout in the tractor enables the integral length to be quite short, and the distance from the ball head to the pull rod at the rear part is short. Thus, the moment borne by the pull rod during use is relatively small. This characteristics also help the tractor can be used for bigger load, can install on large-scale trailer, has improved the application scope of tractor, and the design of limiting plate simultaneously for pull rod and limiting plate laminating area are bigger, and the bulb is locked by the interior piece of upgrading in the ball chamber, and the interior piece of upgrading leans on behind one's back the limiting plate, forms a wedge structure. The wedge-shaped structure is particularly firm, and the loading level of the tractor is effectively improved.

Drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

FIG. 3 is an exploded view of the present invention;

figure 4 is an exploded view of the locking assembly of the present invention.

In the figure: 1. a cast steel shell; 101. a stopper; 102. mounting holes; 103. a notch; 2. a ball cavity; 3. mounting grooves; 301. a limiting plate; 4. adjusting the bolt; 5. a limiting structure; 501. a slope lifting sleeve; 502. a limiting port; 503. a clamping rod; 6. a locking assembly; 601. upgrading the inner block; 602. a pull rod; 603. an aluminum die-cast knob; 604. a resistance increasing layer; 605. a gear lever; 606. a contact surface; 607. a limiting surface; 608. a first circular hole; 609. a second circular hole; 610. disassembling the bolt; 611. a strip-shaped groove; 7. an elastic structure; 701. a gasket ring is sleeved at the bottom; 702. and (5) pressing a spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the following embodiments may be combined without conflict.

See fig. 1, 2 and 3: a quick locking tractor for a trailer comprises a cast steel shell 1, wherein a ball cavity 2 and a mounting groove 3 which are mutually communicated are respectively formed in two sides of the bottom end of the cast steel shell 1, an adjustable adjusting bolt 4 is arranged in the ball cavity 2, two ends of the adjusting bolt 4 penetrate through the ball cavity 2 and the cast steel shell 1, a limiting structure 5 is arranged at the top end of the cast steel shell 1, a locking assembly 6 is arranged at the top end of the limiting structure 5, an elastic structure 7 is arranged on the surface of the locking assembly 6, and the bottom end of the locking assembly 6 sequentially penetrates through the limiting structure 5, the cast steel shell 1, the mounting groove 3 and the ball cavity 2 and is in contact with the adjusting bolt 4;

locking Assembly 6 is provided with pull rod 602 including upgrading inner block 601 in the bottom of upgrading inner block 601, and upgrading inner block 601 and limit structure 5 are run through to the top of pull rod 602. Locking Assembly 6 rotates downwards, under limit structure 5's effect, convenient operation can realize the quick locking of equipment, and the inside structural configuration of this tractor makes holistic length fairly short, and the bulb is short from the pull rod 602 distance at rear portion. Thus, the torque experienced by the tie rod 602 during use is relatively small. This feature also helps the tractor to be able to be used for larger loads, to be able to be mounted on large trailers, and to increase the range of applicability of the tractor.

See fig. 2 and 3 for illustration: limiting structure 5 includes that quantity is two slope lifting cover 501, and two slope lifting cover 501's shape is the echelonment, and two slope lifting cover 501 end to end, and two slope lifting cover 501 are installed in the top of cast steel casing 1, and the higher one side of slope lifting cover 501 height is provided with spacing mouthful 502, and the fixed surface of pull rod 602 is connected with quantity be two and with spacing mouthful 502 assorted kelly 503. The clamping rod 503 moves synchronously along with the pull rod 602, and moves at the top end of the slope lifting sleeve 501 to be finally clamped with the limiting port 502, so that the operation is simple, the locking difficulty is reduced, and the tractor can be quickly locked.

As shown in FIG. 1: the top end of the pull rod 602 is provided with a detachable aluminum die-casting knob 603, and the upper surface of the aluminum die-casting knob 603 is provided with a resistance-increasing layer 604. When rotatory aluminium die-casting knob 603, the palm is at first with increasing the contact of resistance layer 604, increases the resistance layer 604 and can effectively increase frictional resistance between palm and the aluminium die-casting knob 603, takes place the condition of skidding when avoiding rotatory aluminium die-casting knob 603, and the design of aluminium die-casting knob 603, the ascending and the decline of the interior piece 601 of control upgrading of being convenient for, the opening of the locking of tractor also can be controlled simultaneously, the later stage of being convenient for is to the operation of tractor.

As shown in FIG. 1: the top end of the cast steel shell 1 is fixedly connected with a stop block 101, and the lower end of the surface of the aluminum die-casting knob 603 is fixedly connected with two stop rods 605. The stop 101 can stop the stop rod 605 from continuing to rotate after the retractor is locked, and can provide a reference for the locking position to avoid over-rotation.

As shown in fig. 2 and 3: the inner bottom wall of the mounting groove 3 is fixedly connected with a limiting plate 301 attached to the upgrading inner block 601, and the inclination of the limiting plate 301 is consistent with that of the pull rod 602. The design of same gradient for pull rod 602 and limiting plate 301 laminating area are bigger, and the bulb is locked by upgrading inner block 601 in ball chamber 2, and upgrading inner block 601 leans on limiting plate 301 behind one's back, forms a wedge structure. The wedge-shaped structure is particularly firm, and the loading level of the tractor is effectively improved.

As shown in fig. 4: contact surfaces 606 are arranged on two sides of the upgrading inner block 601, and the curvature radius of the contact surface 606 close to the limiting plate 301 is larger than that of the contact surface 606 on the other side. Make contact surface 606 and bulb laminate more, area of contact is bigger, and the effect of locking is better.

As shown in fig. 4: the bottom of upgrading inner block 601 is seted up spacing face 607, and the inner wall of spacing face 607 and adjusting bolt 4's upper surface are laminated mutually. The limiting surface 607 at the bottom end of the upgrading inner block 601 can better combine the upgrading inner block 601 with the adjusting bolt 4, so that the contact area is enlarged, and the upgrading inner block 601 is more stable.

As shown in fig. 2: the surface of cast steel casing 1 is equipped with evenly distributed and the mounting hole 102 that is linked together with mounting groove 3, and circular-arc breach 103 has all been seted up to cast steel casing 1's top and bottom, and breach 103 is linked together with mounting groove 3. Mounting hole 102 may better connect cast-steel housing 1 to other structures, and the design of mounting hole 102 and notch 103 may be more convenient when connecting cast-steel housing 1.

As shown in fig. 4: first circular port 608 has been seted up on the top of upgrading inner mass 601, the second circular port 609 that is linked together with first circular port 608 is seted up to the bottom of upgrading inner mass 601, the diameter of second circular port 609 is greater than the diameter of first circular port 608, pull rod 602 is pegged graft in first circular port 608, the interior roof of second circular port 609 sets up dismantlement bolt 610, the top of dismantling bolt 610 runs through second circular port 609 and is connected with pull rod 602, strip-shaped groove 611 has been seted up to the bottom of dismantling bolt 610. When the tractor is dismantled to needs, improve the rotatory bolt 610 of dismantling of bar groove 611, can separate piece 601 and the bolt 610 of dismantling in the upgrading to realize the separation of piece 601 and pull rod 602 in the upgrading, make the tractor dismantle more convenient, the later stage of being convenient for is to the maintenance and the maintenance of tractor.

See fig. 2 and 4 for illustration: the elastic structure 7 comprises a bottom sleeve gasket ring 701, the bottom sleeve gasket ring 701 is sleeved on the surface of the pull rod 602, a snap spring is arranged on the surface of the pull rod 602, a pressure spring 702 is arranged at the upper end of the snap spring, and the top end of the pressure spring 702 is connected with the bottom sleeve gasket ring 701. And the locking component 6 is used in combination, the bottom sleeve gasket ring 701 is contacted with the inner top wall of the cast steel shell 1, the pressure spring 702 has a downward force, so that the clamp spring drives the pull rod 602 to move downwards, the upgrading inner block 601 is contacted with the adjusting bolt 4 to effectively lock the ball head, and the locking component 6 is not easy to loosen under the action of the pressure spring 702, the clamp spring and the bottom sleeve gasket ring 701.

During locking, aluminium die-casting knob 603 in the rotatory locking subassembly 6, the palm is direct to contact with resistance-increasing layer 604, pull rod 602 takes place rotatoryly along aluminium die-casting knob 603 in step, kelly 503 slides on the top of slope lifting sleeve 501, when kelly 503 rotates to spacing mouthful 502, can realize the locking of tractor, in this process, end cover spacer ring 701 can contact with cast steel casing 1's interior roof, pressure spring 702 has a decurrent power, drive the jump ring and move down, thereby drive pull rod 602 and move down, avoid the tractor to become flexible under the state of locking, the spacing face 607 of upgrading inner block 601 bottom is direct to laminate with adjusting bolt 4, at this time, the bulb is locked in ball chamber 2, can't move down

The reverse rotation aluminium die-casting knob 603, the pull rod 602 can drive the interior piece 601 of upgrading to rise like this, when aluminium die-casting knob 603 is located the peak, the interior piece 601 of upgrading also shifts up to the ball chamber 2 upper portion outside along limiting plate 301 behind one's back, pull the bulb at this time and freely pass in and out, and the design of same gradient pull rod 602 and limiting plate 301, the bulb is pinned by the interior piece 601 of upgrading in ball chamber 2, the interior piece 601 of upgrading leans on limiting plate 301 behind one's back, form a wedge structure. The wedge-shaped structure is particularly firm, and the loading level of the tractor is effectively improved.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.