Anti-loosening structure of piston rod assembly

Abstract

The utility model discloses an anti-loosing structure of a piston rod assembly, which comprises a piston and a piston rod, the piston rod and the piston are locked through threads of a perforation thread connecting piece, the end face of the piston rod is provided with a mounting groove, a locking piece is arranged in the mounting groove, the end portion of the locking piece is attached to the head portion of the perforation thread connecting piece, and the end portion of the locking piece is fixedly connected with the piston rod. A locking hole is formed in the mounting groove, and an elastic piece making contact with the locking piece is arranged in the locking hole. By means of the mode, according to the anti-loosening structure of the piston rod assembly, the locking piece and the perforation thread connecting piece are mutually locked, the perforation thread connecting piece is prevented from loosening from the piston and the piston rod, and therefore the locking effect of the perforation thread connecting piece is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of oil cylinders, in particular to an anti-loosening structure of a piston rod assembly. Background Art

[0002] With the development of industrial technology, mechanical equipment is everywhere, and many devices need to use cylinders to complete some related actions. Cylinders are widely used in various mechanical fields due to their simple structure, large output force, high-power power components, high working efficiency, stable and reliable performance, easy use and maintenance and other excellent characteristics. However, the connection reliability of the piston rod and piston of the oil cylinder has a crucial influence on the performance and life of the oil cylinder. At present, most oil cylinders generally consider the interchangeability of parts, and the piston rod and piston are made separate, and the working required action is completed through threaded connection. The anti-loosening of the piston rod and piston thread will become an important consideration. If the anti-loosening is not good, the loosening of the piston will cause many losses and end up with safety accidents. At present, the most commonly used means of anti-loosening of piston and piston rod threads are mainly steel ball plus screw anti-loosening, saddle screw anti-loosening, etc. For the saddle screw anti-loosening structure, due to frequent impact and alternating loads, after working for a certain period of time, the preload force of the piston and piston rod connection thread decreases, the self-locking ability of the friction pair is weakened, and loosening occurs under impact loads. The saddle screw that prevents the piston thread from rotating relative to the piston rod thread will play an important role at this time, but often under frequent alternating and impact loads, the saddle screw also becomes loose. After the saddle screw is loosened and falls into the oil cylinder, it will cause the cylinder to be pulled, resulting in the loss of the entire oil cylinder being scrapped. Summary of the invention

[0003] The main technical problem solved by the utility model is to provide an anti-loosening structure of a piston rod assembly, by locking a locking plate and a saddle threaded connector with each other to prevent the saddle threaded connector from loosening from the piston and the piston rod, thereby ensuring the locking effect of the saddle threaded connector.

[0004] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide an anti-loosening structure of a piston rod assembly, including a piston and a piston rod, the piston rod and the piston are threadedly locked by a saddle threaded connector, an installation groove is provided on the end surface of the piston rod, a locking plate is provided in the installation groove, the end of the locking plate is attached to the head of the saddle threaded connector, a locking hole is provided in the installation groove, and an elastic member in contact with the locking plate is provided in the locking hole.

[0005] In a preferred embodiment of the present invention, the piston rod and the piston are provided with mounting holes, and the mounting holes are located at both ends of the mounting groove and are connected through.

[0006] In a preferred embodiment of the present invention, the locking piece is embedded in the mounting groove, and the saddle threaded connector is screwed into the mounting hole to compress the locking piece.

[0007] In a preferred embodiment of the utility model, the head of the saddle thread connector has a positioning step, and the positioning step contacts the end surface of the locking plate to limit the relative rotation of the locking plate and the saddle thread connector.

[0008] In a preferred embodiment of the present invention, the bottom of the locking plate has a mounting seat, the mounting seat extends into the locking hole and is connected to the elastic member.

[0009] In a preferred embodiment of the present invention, there is an installation gap between the head of the mounting seat and the bottom of the locking hole.

[0010] In a preferred embodiment of the present invention, a through pressure equalizing hole is provided on the mounting seat.

[0011] In a preferred embodiment of the present invention, the mounting groove is arranged radially, and the locking hole and the mounting hole are arranged axially.

[0012] In a preferred embodiment of the present invention, the saddle threaded connector is a saddle screw or a saddle bolt.

[0013] The beneficial effect of the utility model is that the anti-loosening structure of the piston rod assembly of the utility model locks the front and rear end surfaces of the locking plate through the positioning step and the spring, thereby realizing the mutual locking effect of the saddle threaded connector and the locking plate, ensuring that neither of them will loosen and achieving a permanent locking effect.

[0014] The anti-loosening structure of the piston rod assembly of the utility model has an installation gap on the locking groove for axial movement of the locking plate, which is convenient for screwing the locking plate into the saddle threaded connector after installation, and cooperates with the pressure equalizing hole to achieve pressure balance on the front and back sides of the locking plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0016] Figure 1 It is a structural schematic diagram of a preferred embodiment of the anti-loosening structure of the piston rod assembly of the utility model;

[0017] Figure 2 yes Figure 1 Schematic diagram of the local structure;

[0018] The markings of the components in the accompanying drawings are as follows: 1. piston, 2. piston rod, 3. saddle screw, 4. mounting groove, 5. locking plate, 6. locking hole, 7. elastic member, 8. pressure equalizing hole, 9. positioning step, 10. mounting seat. DETAILED DESCRIPTION

[0019] The technical scheme in the embodiment of the utility model will be described clearly and completely below. The structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification, so that people familiar with this technology can understand and read, and are not used to limit the limiting conditions that can be implemented in the utility model, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that can be produced by the utility model and the purpose that can be achieved, should still fall within the scope of the technical content disclosed in the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of narration, and are not used to limit the scope that can be implemented. The change or adjustment of its relative relationship should also be regarded as the scope that can be implemented in the utility model without substantially changing the technical content.

[0020] See also Figure 1 and Figure 2 A piston rod assembly anti-loosening structure includes a piston 1 and a piston rod 2. The piston rod 2 and the piston 1 have mounting holes. The piston rod 2 and the piston 1 are threadedly locked by a saddle threaded connector. The saddle threaded connector is preferably a saddle screw 3, and other conventional connectors such as a saddle bolt can also be selected. The saddle screw 3 is screwed into the mounting hole to lock the piston 1 and the piston rod 2.

[0021] The end surface of the piston rod 2 is provided with a mounting groove 4. The mounting groove 4 is located inside the mounting hole, and the mounting groove 4 and the mounting hole are connected through. The mounting groove 4 is arranged in the radial direction, and the mounting hole is arranged in the axial direction.

[0022] A locking piece 5 is provided in the mounting groove 4. A locking hole 6 is provided in the mounting groove 4, and the locking hole 6 is also axially arranged. An elastic member 7 in contact with the locking piece 5 is provided in the locking hole 6, and the elastic member 7 is preferably a spring. The bottom of the locking piece 5 has a mounting seat 10, which extends into the locking hole 6 and is connected to the elastic member 7. During installation, the spring is first placed in the locking hole 6, and then the locking piece 5 is placed in the locking groove. Since there is an installation gap between the head of the mounting seat 10 and the bottom of the locking hole 6, the locking groove has a certain amount of moving space in the axial direction, which is convenient for the subsequent installation of the saddle screw 3.

[0023] The mounting seat 10 is provided with a through pressure equalizing hole 8 for balancing the pressure on both sides of the locking plate 5 to prevent the locking plate 5 from being unable to bounce due to the compression of the spring under the oil pressure.

[0024] The end of the locking piece 5 is attached to the head of the saddle screw 3, the locking piece 5 is embedded in the mounting groove 4, and the saddle screw 3 is screwed into the mounting hole to compress the locking piece 5. The head of the saddle screw 3 has a positioning step 9, and the positioning step 9 contacts the end face of the locking piece 5 to limit the relative rotation of the locking piece 5 and the saddle screw 3. The upper end face of the positioning step 9 is used to compress the locking piece 5, and the side faces position the locking piece 5. The above structure makes it impossible for the locking screw to rotate in the circumferential direction, and the locking piece 5 cannot be disengaged in the axial direction, so that the locking piece 5 and the saddle screw 3 are interlocked.

[0025] The assembly process of the anti-loosening structure of the piston rod assembly of the utility model is as follows:

[0026] After the piston is installed on the piston rod 2 and the torque is applied, first, two mounting holes are drilled on the same section passing through the axis of the piston rod 2, and the center of the section is located on the center surface of the mounting groove 4 on the end face of the piston rod 2. Then, the two springs are respectively inserted into the mounting seat 10 of the locking plate 5, and the locking plate 5 and the spring are installed in the spring mounting hole together, and the locking plate 5 is pressed to compress the spring, and the locking plate 5 is close to the bottom of the groove 4 on the end face of the piston rod 2. Then, the saddle screw 3 is screwed on, and the tightening angle is fine-tuned after tightening the saddle screw 3, so that the positioning step 9 of the saddle screw 3 is aligned with the end face of the locking plate 5. At this time, the pressed locking plate 5 is released, and the locking plate 5 will bounce up under the action of the spring force, and then the saddle screw 3 is stuck. At this time, the locking plate 5 is in the mounting groove 4 on the end face of the piston rod 2, and the two saddle screws 3 cannot fall out when the locking plate 5 is stuck, and the assembly is completed.

[0027] When the oil cylinder is working, if the saddle screw 3 loosens and tends to rotate, the screw positioning surface will contact the end surface of the locking plate 5, but the locking plate 5 cannot move due to the restraint of the saddle screws 3 on both sides and the mounting grooves 4 on the piston rod 2, and conversely the saddle screw 3 cannot rotate.

[0028] Different from the prior art, the anti-loosening structure of the piston rod assembly of the utility model prevents the saddle threaded connector from loosening from the piston and the piston rod by locking the locking plate and the saddle threaded connector with each other, thereby ensuring the locking effect of the saddle threaded connector.

[0029] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A piston rod assembly anti-loosening structure, comprising a piston (1) and a piston rod (2), wherein the piston rod (2) and the piston (1) are thread-locked by a saddle thread connection, characterized in that: The piston rod (2) is provided with a mounting groove (4) on its end surface, a locking piece (5) is provided in the mounting groove (4), an end of the locking piece (5) is attached to the head of the saddle threaded connector, a locking hole (6) is provided in the mounting groove (4), and an elastic piece (7) in contact with the locking piece (5) is provided in the locking hole (6).

2. The anti-loosening structure of the piston rod assembly according to claim 1, characterized in that: The piston rod (2) and the piston (1) are provided with mounting holes, the mounting holes being located at both ends of the mounting groove (4) and being through-connected.

3. The anti-loosening structure of the piston rod assembly according to claim 2, characterized in that: The locking piece (5) is embedded in the mounting groove (4), and the saddle threaded connector is screwed into the mounting hole to compress the locking piece (5).

4. The anti-loosening structure of the piston rod assembly according to claim 3, characterized in that: The head of the saddle thread connector has a positioning step (9), and the positioning step (9) contacts the end surface of the locking plate (5) to limit the relative rotation of the locking plate (5) and the saddle thread connector.

5. The anti-loosening structure of the piston rod assembly according to claim 1, characterized in that: The bottom of the locking plate (5) is provided with a mounting seat (10), and the mounting seat (10) extends into the locking hole (6) and is connected to the elastic member (7).

6. The anti-loosening structure of the piston rod assembly according to claim 5, characterized in that: There is an installation gap between the head of the installation seat (10) and the bottom of the locking hole (6).

7. The anti-loosening structure of the piston rod assembly according to claim 6, characterized in that: The mounting seat (10) is provided with a through pressure equalizing hole (8).

8. The anti-loosening structure of the piston rod assembly according to any one of claims 2 to 7, characterized in that: The mounting groove (4) is arranged in the radial direction, and the locking hole (6) and the mounting hole are arranged in the axial direction.

9. The anti-loosening structure of the piston rod assembly according to claim 8, characterized in that: The saddle thread connection piece is a saddle screw (3) or a saddle bolt.

Images