1. The utility model provides a piston rod intensity, sealed test fixture which characterized in that includes: a mandrel and an inclined hole cover sealing structure;

the inclined hole sealing structure is sleeved on the rod body of the piston rod and is used for sealing the inclined hole on the left side surface of the piston head on the piston rod;

the mandrel is arranged on the through hole of the piston rod in a penetrating mode, a gap is formed between the outer cylindrical surface of the mandrel and the inner hole surface of the through hole of the piston rod, an injection opening used for injecting pressure media is formed in one end of the mandrel, and the injection opening is communicated with the gap;

a left blocking structure is arranged at the left end of the mandrel and used for blocking the left end face of the rod body of the piston rod; and a right blocking structure is arranged at the right end of the mandrel and used for blocking the right end surface of the piston ring of the piston rod.

2. A piston rod strength, seal test fixture, as claimed in claim 1, wherein: the inclined hole sealing cover structure comprises a sleeve and a sealing gasket, the sleeve is sleeved on the piston rod body, an open accommodating cavity is formed in the right side of the sleeve and used for accommodating the piston head, and the sealing gasket is arranged between the bottom wall of the accommodating cavity and the left side face of the piston head; a locking nut is arranged on the right side of the piston head and is in threaded connection with the sleeve; an empty opening is formed in the locking nut.

3. A piston rod strength, seal test fixture, as claimed in claim 2, wherein: the clamping ring is arranged between the locking nut and the right end face of the piston head, and the hardness of the material of the clamping ring is lower than that of the material of the piston head.

4. A piston rod strength, seal test fixture, as claimed in claim 1, wherein: the injection opening is a counter bore arranged on the left end face of the core shaft, a side hole perpendicular to the counter bore is arranged on the core shaft, and the counter bore is communicated with the gap through the side hole.

5. A piston rod strength, seal test fixture, as claimed in claim 1, wherein: and the excircle of the mandrel at the injection inlet is provided with a thread for connecting a pressure medium injection device.

6. A piston rod strength, seal test fixture, as claimed in claim 1, wherein: the left blocking structure comprises a left sealing ring and an annular boss arranged on the mandrel; the sealing ring is arranged between the left end face of the rod body of the piston rod and the right end face of the annular boss; the annular boss and the mandrel are of an integrated forming structure.

7. The piston rod strength, seal test fixture of claim 6, wherein: the outer diameter of the annular boss is larger than or equal to that of the left sealing ring; the outer diameter of the left sealing ring is larger than or equal to the outer diameter of the rod body on the piston rod.

8. A piston rod strength, seal test fixture, as claimed in claim 1, wherein: the right blocking structure comprises a right sealing ring and a compression nut, wherein the right sealing ring and the compression nut are sleeved on the right end of the mandrel.

9. A piston rod strength, seal test fixture, as claimed in claim 8, wherein: the outer diameter of the right sealing ring is smaller than that of the piston ring.

10. A piston rod strength, seal test fixture, according to claim 7, wherein: and a gasket is arranged between the compression nut and the right sealing ring, and the outer diameter of the gasket is larger than or equal to that of the right sealing ring.

Background

The piston rod shown in figure 1 is a key part in a hydraulic actuator cylinder unit on an aircraft engine, and comprises a rod body and a piston head at the right end of the rod body, wherein the rod body and the piston head are of an integrated forming structure, a piston ring is embedded in the center of the right side of the piston head, and the piston ring is connected with the piston head in a welding mode. When the strength and sealing performance of the piston rod are tested, certain pressure medium is required to be filled into the inner cavity of the piston rod for strength and sealing performance tests, and the piston rod is not allowed to be damaged or leaked.

Because the piston rod is a hollow structure with two open ends, the rod body is of a thin-wall structure, and the left side surface of the piston head is provided with a plurality of inclined holes communicated to the through hole of the piston rod, the difficulty of the strength and the tightness test of the piston rod is increased. At present, a special test fixture for strength and sealing tests of the piston rod is not available, so that the piston rod is difficult to test, and the production stagnation phenomenon is caused. The problem to be solved is to provide a clamp for performing strength and sealing tests on the piston rod.

Disclosure of Invention

The invention mainly aims to provide a piston rod strength and sealing test fixture, and aims to solve the technical problems.

In order to achieve the aim, the invention provides a piston rod strength and sealing test fixture which comprises a mandrel and an inclined hole sealing cover structure; the inclined hole sealing structure is sleeved on the rod body of the piston rod and is used for sealing the inclined hole on the left side surface of the piston head on the piston rod; the mandrel is arranged on the through hole of the piston rod in a penetrating mode, a gap is formed between the outer cylindrical surface of the mandrel and the inner hole surface of the through hole of the piston rod, an injection opening used for injecting pressure media is formed in one end of the mandrel, and the injection opening is communicated with the gap; a left blocking structure is arranged at the left end of the mandrel and used for blocking the left end face of the rod body of the piston rod; and a right blocking structure is arranged at the right end of the mandrel and used for blocking the right end surface of the piston ring of the piston rod.

Preferably, the inclined hole sealing cover structure comprises a sleeve and a sealing gasket, the sleeve is sleeved on the piston rod body, an open accommodating cavity is formed in the right side of the sleeve and is used for accommodating the piston head, and the sealing gasket is arranged between the bottom wall of the accommodating cavity and the left side face of the piston head; a locking nut is arranged on the right side of the piston head and is in threaded connection with the sleeve; an empty opening is formed in the locking nut. Set up empty trompil and form the accommodation space of right block structure on lock nut, the installation and the dismantlement of the right block structure of being convenient for.

Preferably, a compression ring is arranged between the locking nut and the right end face of the piston head, and the hardness of the compression ring material is lower than that of the piston head material. Set up the clamping ring and can adjust the interval between lock nut and the piston head in order to guarantee better right the sleeve is taut, and the hardness of clamping ring material is less than simultaneously the hardness of piston head material avoids causing the crushing to the piston head in order to avoid carrying out the in-process of locking, has protected the piston head effectively.

Preferably, the injection port is a counter bore arranged on the left end face of the mandrel, a side hole perpendicular to the counter bore is arranged on the mandrel, and the counter bore is communicated with the gap through the side hole.

Preferably, the outer circle of the mandrel at the injection port is provided with threads for connecting a pressure medium injection device. Adopts threaded connection, has simple structure and convenient operation.

Preferably, the left blocking structure comprises a left sealing ring and an annular boss arranged on the mandrel; the sealing ring is arranged between the left end face of the rod body of the piston rod and the right end face of the annular boss; the annular boss and the mandrel are of an integrated forming structure. The annular boss and the mandrel are formed by integral turning, and the annular boss and the mandrel are simple in structure and convenient to machine and manufacture.

Preferably, the outer diameter of the annular boss is larger than or equal to that of the left sealing ring; the outer diameter of the left sealing ring is larger than or equal to the outer diameter of the rod body on the piston rod. By adopting the structure, the pressing area of the annular boss on the left sealing ring and the sealing contact area of the left sealing ring on the left end face of the upper rod body of the piston rod can be better ensured, and the sealing effect of the left sealing ring is further ensured.

Preferably, the right blocking structure comprises a right sealing ring and a compression nut which are sleeved on the right end of the mandrel.

Preferably, the right seal ring has an outer diameter smaller than an outer diameter of the piston ring. Can effectively avoid right sealing washer to cause the block to the welding seam of piston ring and piston head, in the experimentation so that observe the leakproofness of welding seam.

Preferably, a gasket is arranged between the compression nut and the right sealing ring, and the outer diameter of the gasket is larger than or equal to that of the right sealing ring. By adopting the structure that the outer diameter of the gasket is larger than or equal to that of the right sealing ring, the pressing area of the gasket on the right sealing ring can be better ensured, and the sealing effect of the right sealing ring is ensured.

The invention achieves the following beneficial effects:

(1) according to the strength and sealing test fixture for the piston rod, provided by the invention, during testing, only the mandrel, the inclined hole sealing cover structure, the left blocking structure and the right blocking structure are required to be assembled with the piston rod, and the strength and sealing test can be carried out on the piston rod by injecting a pressure medium through the injection opening, so that the operation is simple and convenient, the test efficiency is greatly improved, and the problem of difficulty in testing caused by the fact that the piston rod is of a thin-wall structure and has a plurality of inclined holes is solved.

(2) The strength and sealing test fixture for the piston rod provided by the invention can effectively realize the end face and radial sealing of the piston rod part, and ensure the smooth performance of the strength and sealing test of the piston rod part.

(3) The piston rod strength and sealing test fixture provided by the invention has simple structure of each component, and can finish the processing of each component by adopting numerical control turning or numerical control milling, thereby greatly reducing the manufacturing cost of the test fixture.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic diagram of the construction of a piston rod in a hydraulic ram unit on an aircraft engine;

FIG. 2 is a schematic structural view of the piston rod after assembling the strength and sealing test fixture and the piston rod provided by the invention;

FIG. 3 is a schematic view of the mandrel of the present invention cooperating with the left and right blocking structures;

FIG. 4 is a front view of the mandrel of the present invention;

FIG. 5 is a cross-sectional view taken along A-A of FIG. 4;

FIG. 6 is a schematic view showing the structure of the sleeve, the packing and the lock nut according to the present invention;

FIG. 7 is a schematic view of the construction of the sleeve of the present invention;

FIG. 8 is a front view of the lock nut of the present invention;

FIG. 9 is a cross-sectional view taken along B-B of FIG. 8;

the reference numbers illustrate: 10. a piston rod; 11. a rod body; 12. a piston head; 13. a piston ring; 14. an inclined hole; 20. a mandrel; 21. an injection port; 22. a counter bore; 23. a side hole; 24. a thread; 30. a left sealing ring; 31. an annular boss; 40. a right seal ring; 41. a compression nut; 42. a gasket; 50. a sleeve; 51. a gasket; 52. an accommodating cavity; 53. locking the nut; 54. opening a hole in an empty mode; 55. pressing a ring; 60. a gap.

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 all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

As shown in fig. 1, which is a schematic structural diagram of a piston rod 10 in a hydraulic actuator cylinder unit on an aircraft engine, the piston rod 10 includes a rod body 11 and a piston head 12 at the right end of the rod body 11, the rod body 11 and the piston head 12 are of an integral molding structure, the piston rod 10 is of a hollow structure with two open ends, the rod body 11 is of a thin-wall structure, a piston ring 13 is embedded in the center of the right side of the piston head 12, the piston ring 13 is connected with the piston head 12 in a welding manner, and a plurality of inclined holes 14 are formed in the left side surface of the piston head 12 and are communicated with a through hole of the piston rod 10.

As shown in fig. 2, the strength and sealing test fixture for a piston rod 10 according to the present invention is a specific embodiment after being assembled with the piston rod 10, and the strength and sealing test fixture for a piston rod 10 includes a mandrel 20 and an inclined hole capping structure; the inclined hole sealing structure is sleeved on the rod body 11 of the piston rod 10 and is used for sealing an inclined hole 14 on the left side surface of a piston head 12 on the piston rod 10; the mandrel 20 is arranged on the through hole of the piston rod 10 in a penetrating way, a gap 60 is arranged between the outer cylindrical surface of the mandrel 20 and the inner hole surface of the through hole of the piston rod 10, an injection port 21 for injecting pressure medium is arranged at one end of the mandrel 20, and the injection port 21 is communicated with the gap 60; a left blocking structure is arranged at the left end of the mandrel 20 and used for blocking the left end face of the rod body 11 of the piston rod 10; a right blocking structure is provided at the right end of the mandrel 20 for blocking the right end surface of the piston ring 13 of the piston rod 10.

In this embodiment, the inclined hole sealing structure includes a sleeve 50 and a sealing gasket 51, the sleeve 50 is sleeved on the rod body 11 of the piston rod 10, the right side of the sleeve 50 is provided with an open accommodating cavity 52 for accommodating the piston head 12, and the sealing gasket 51 is arranged between the bottom wall of the accommodating cavity 52 and the left side surface of the piston head 12; a locking nut 53 is arranged on the right side of the piston head 12, and the locking nut 53 is in threaded connection with the sleeve 50; a blank opening 54 is provided in the lock nut 53. An empty opening 54 is formed in the locking nut 53 to form an accommodating space of the right blocking structure, so that the right blocking structure can be conveniently mounted and dismounted.

In this embodiment, a pressing ring 55 is disposed between the lock nut 53 and the right end surface of the piston head 12, and the hardness of the material of the pressing ring 55 is lower than that of the material of the piston head 12. The setting clamping ring 55 can adjust the interval between lock nut 53 and piston head 12 to guarantee better right sleeve 50 strains, and the hardness of clamping ring 55 material is less than the hardness of piston head 12 material avoids causing the crushing to piston head 12 in the in-process of locking simultaneously, has protected piston head 12 effectively.

In this embodiment, the injection port 21 is a counter bore 22 disposed on the left end surface of the core shaft 20, a side hole 23 perpendicular to the counter bore 22 is disposed on the core shaft 20, and the counter bore 22 is communicated with the gap 60 through the side hole 23.

In the present embodiment, a thread 24 is provided on the outer circumference of the mandrel 20 at the injection port 21 for connecting a pressure medium injection device. Adopts threaded connection, has simple structure and convenient operation.

In the present embodiment, the left blocking structure includes a left sealing ring 30 and an annular boss 31 disposed on the mandrel 20; the sealing ring is arranged between the left end face of the rod body 11 of the piston rod 10 and the right end face of the annular boss 31; the annular boss 31 and the mandrel 20 are of an integral forming structure. The annular boss 31 and the mandrel 20 are formed by integral turning, and the annular boss is simple in structure and convenient to machine and manufacture.

In this embodiment, the outer diameter of the annular boss 31 is greater than or equal to the outer diameter of the left seal ring 30; the outer diameter of the left sealing ring 30 is greater than or equal to the outer diameter of the rod body 11 on the piston rod 10. By adopting the structure, the pressing area of the annular boss 31 on the left sealing ring 30 and the sealing contact area of the left sealing ring 30 on the left end face of the rod body 11 on the piston rod 10 can be better ensured, and the sealing effect of the left sealing ring 30 is further ensured.

In this embodiment, the right blocking structure includes a right sealing ring 40 and a compression nut 41, which are sleeved on the right end of the spindle 20.

In the present embodiment, the outer diameter of the right seal ring 40 is smaller than the outer diameter of the piston ring 13. The right sealing ring 40 can be effectively prevented from blocking the welding line between the piston ring 13 and the piston head 12, so that the sealing performance of the welding line can be conveniently observed in the test process.

In the present embodiment, a washer 42 is disposed between the compression nut 41 and the right seal ring 40, and an outer diameter of the washer 42 is greater than or equal to an outer diameter of the right seal ring 40. By adopting the structure that the outer diameter of the gasket 42 is larger than or equal to that of the right sealing ring 40, the pressing area of the gasket 42 on the right sealing ring 40 can be better ensured, and the sealing effect of the right sealing ring 40 is ensured.

In this embodiment, the left seal ring 30, the right seal ring 40, and the seal gasket 51 are all made of nylon material.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.