Double-outlet type piston rod structure

Abstract

The utility model discloses a double-outlet type piston rod structure, which belongs to the technical field of hydraulic pressure and pneumatics, and comprises a piston rod, a piston rod, a piston rod and a piston rod, the piston is provided with a through hole allowing the piston rod to penetrate through, one end face of the piston sinks inwards to form a first annular hole, the inner diameter of the first annular hole is larger than that of the piston rod, and the first annular hole is provided with internal threads; the pressing ring is formed by splicing a plurality of annular parts, the annular parts can be embedded into the annular groove of the piston rod in the radial direction of the piston rod, and the overall outer diameter of the pressing ring is larger than the piston rod and smaller than the inner diameter of the first annular hole; the annular nut is provided with an external thread, the annular nut can be arranged in the piston rod in a sleeving mode and is in threaded connection with the first annular hole of the piston, and the annular nut presses the pressing ring to the piston. The utility model has the following advantages and effects: the scheme utilizes a new mechanical structure, the whole structure is compact, the assembly is convenient, and the production cost is low.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic and pneumatic operation and relates to a double-outlet piston rod structure. Background Art

[0002] A double-rod oil or gas cylinder usually refers to an actuator whose piston rods extend out of the cylinder body at both ends. Conventional double-rod piston rods are made by splicing two piston rods through screw locking, but the coaxiality of this spliced ​​piston rod is poor, which can easily lead to product scrapping due to poor assembly accuracy.

[0003] In order to improve the coaxiality problem of the double-outlet oil cylinder piston rod, relevant companies have designed a technical solution for an integrated piston rod. For example, a Chinese patent with application number 202322348464.9 discloses a connection structure between a small double-outlet oil cylinder sealing ring and a sealing ring rod, including a cylinder barrel, the end of the cylinder barrel is fixedly connected to a cylinder head by bolts, a pressure cover is installed at one end of the cylinder head, a sealing ring rod is slidably connected to the inside of the cylinder barrel, a positioning groove is provided on the outer wall of the sealing ring rod, a sealing ring is sleeved on the outer wall of the cylinder barrel, and a conical pin is inserted in the middle groove of the sealing ring.

[0004] However, this structure in which the piston and the piston rod are connected by a pin shaft requires hole-to-hole calibration before assembly, resulting in low overall assembly efficiency and easy loosening after long-term use. In addition, the piston also needs to be designed to be bulky, resulting in high material costs. Summary of the invention

[0005] The utility model aims to solve the above problems in the prior art and proposes a double-outlet piston rod structure, which is easy to assemble, has a compact overall structure and low production cost.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A double-outlet piston rod structure, comprising:

[0008] The piston rod is an integrated structure, and an annular groove is provided in the middle of the piston rod;

[0009] A piston, which is provided with a through hole for the piston rod to pass through, and one end surface of the piston is concave to form a first annular hole, the inner diameter of the first annular hole is larger than the piston rod and is provided with an internal thread;

[0010] A compression ring, which is composed of a plurality of annular parts, the plurality of annular parts can be embedded in the annular groove of the piston rod along the radial direction of the piston rod, and the overall outer diameter of the compression ring is larger than the piston rod and smaller than the inner diameter of the first annular hole;

[0011] The annular nut is provided with an external thread. The annular nut can be inserted into the piston rod and threadedly connected with the first annular hole of the piston. The annular nut presses the pressure ring to the piston.

[0012] As a further improvement of the utility model, the pressure ring is formed by splicing two symmetrical half rings.

[0013] As a further improvement of the utility model, the end surface of the annular nut close to the pressure ring is concave to form a second annular hole, and the pressure ring is entirely embedded in the second annular hole.

[0014] As a further improvement of the utility model, the annular nut is integrally embedded in the first annular hole of the piston.

[0015] As a further improvement of the utility model, a slot is provided on the end surface of the annular nut away from the pressure ring.

[0016] As a further improvement of the present invention, a conical guide surface is provided at one end of the first annular hole close to the annular nut.

[0017] As a further improvement of the utility model, a sealing groove is provided in the middle of the outer peripheral wall of the piston, and the sealing groove is used for installing a sealing sleeve.

[0018] As a further improvement of the utility model, both ends of the piston rod are respectively provided with mounting screw holes and clamping planes.

[0019] Based on the above technical solution, the embodiment of the utility model can at least produce the following technical effects:

[0020] 1. When the annular nut is locked, the pressure ring can limit the axial displacement of the piston relative to the piston rod, thereby ensuring that the piston rod can stably extend out of the cylinder body in both directions to work. During the assembly process, the pressure ring and the annular nut can be embedded in the piston for positioning and installation, making the assembly easier and more secure. That is, by providing a split pressure ring and annular nut, the present application can cleverly fix the piston and the piston rod, and effectively improve the assembly efficiency while ensuring the installation reliability.

[0021] 2. The pressure ring is set as two symmetrical half rings, which can improve the interchangeability of parts. That is, two half rings can be arbitrarily selected for assembly during assembly, simplifying the process of parts selection.

[0022] 3. By opening a second annular hole on the annular nut, the pressure ring can provide a coaxial positioning function, that is, the coaxiality of the annular nut and the piston thread is better when connected, thereby ensuring the coaxiality of the piston and the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an exploded view of an embodiment of the utility model.

[0024] Figure 2 It is a cross-sectional view of an embodiment of the utility model.

[0025] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0026] In the figure: 100, piston rod; 110, annular groove; 120, mounting screw hole; 130, clamping plane; 200, piston; 210, first annular hole; 211, conical guide surface; 220, sealing groove; 300, pressure ring; 400, annular nut; 410, second annular hole; 420, slot. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings.

[0028] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0029] like Figures 1 to 3 As shown, the utility model provides a double-outlet piston rod structure, specifically comprising: a piston rod 100, a piston 200, a pressure ring 300 and an annular nut 400, wherein the piston rod 100 is an integrated structure and has the same diameter at both ends, an annular groove 110 is provided in the middle of the piston rod 100, the piston 200 is provided with a through hole for the piston rod 100 to pass through, and one end surface of the piston 200 is concave to form a first annular hole 210, the inner diameter of the first annular hole 210 is larger than the piston rod 100 and is provided with an internal thread; the pressure ring 300 is spliced ​​by a plurality of annular parts, and the plurality of annular parts can be embedded in the annular groove 110 of the piston rod 100 along the radial direction of the piston rod 100, the overall outer diameter of the pressure ring 300 is larger than the piston rod 100 and smaller than the inner diameter of the first annular hole 210; the annular nut 400 is provided with an external thread, the annular nut 400 can be inserted into the piston rod 100 and threadedly connected with the first annular hole 210 of the piston 200, and the annular nut 400 presses the pressure ring 300 to the piston 200.

[0030] When the ring nut 400 is locked, the pressure ring 300 can limit the axial displacement of the piston 200 relative to the piston rod 100, thereby ensuring that the piston rod 100 can stably extend out of the cylinder body in both directions to work. During the assembly process, the pressure ring 300 and the ring nut 400 can be embedded in the piston 200 for positioning and installation, making the assembly easier and more secure.

[0031] That is, the present application can cleverly fix the piston 200 and the piston rod 100 by providing a split-type pressure ring 300 and annular nut 400, and effectively improve the assembly efficiency while ensuring the installation reliability.

[0032] It is worth noting that the pressure ring 300 composed of multiple annular parts is a 360° complete ring. If two annular parts are used, the arc of the annular part is 180°. If three annular parts are used, the arc of the annular part is 120°, and so on. The preferred pressure ring 300 of this embodiment is spliced ​​by two 180° half rings, that is, the pressure ring 300 is set as two symmetrical half rings, which can improve the interchangeability of parts. During assembly, two half rings can be arbitrarily selected for assembly, simplifying the process of selecting parts, thereby reducing costs and improving assembly efficiency.

[0033] In addition, a second annular hole 410 is formed inwardly on the end surface of the annular nut 400 close to the pressure ring 300 , and the pressure ring 300 is entirely embedded in the second annular hole 410 .

[0034] By opening the second annular hole 410 on the annular nut 400 , the pressure ring 300 can provide a coaxial positioning function, that is, the coaxiality of the annular nut 400 and the piston 200 is better when they are threadedly connected, thereby ensuring the coaxiality of the piston 200 and the piston rod 100 .

[0035] It is worth mentioning that the annular nut 400 is also integrally embedded in the first annular hole 210 of the piston 200, so that the overall structure of the piston 200 and the piston rod 100 is more compact and the force on the piston rod 100 is more uniform.

[0036] In order to facilitate the ring nut 400 to be screwed into the piston 200 as a whole, a straight groove 420 is provided on the end surface of the ring nut 400 away from the pressure ring 300 .

[0037] A conical guide surface 211 is provided at one end of the first annular hole 210 close to the annular nut 400 to guide the annular nut 400 to be better screwed into the piston 200 and improve the coaxiality of the annular nut 400 and the piston 200 .

[0038] When the piston 200 and the piston rod 100 of this embodiment work together with the cylinder body, a sealing sleeve needs to be installed to isolate the space on the left and right sides of the piston 200. Specifically, a sealing groove 220 is provided in the middle of the outer peripheral wall of the piston 200, and the sealing groove 220 is used to install the sealing sleeve.

[0039] To facilitate the connection of the piston rod 100 to the executed structure, mounting screw holes 120 and clamping planes 130 are respectively provided at both ends of the piston rod 100. The clamping planes 130 can be clamped by tools such as wrenches to limit the rotation of the piston rod 100. At this time, the screws can be screwed into the mounting screw holes 120 to fix the piston rod 100 and the executed structure.

[0040] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0041] The above description is only a preferred embodiment of the present utility model, so all equivalent changes or modifications made according to the structure, features and principles described in the scope of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A double-outlet piston rod structure, characterized in that: include: The piston rod is an integrated structure, and an annular groove is provided in the middle of the piston rod; A piston, which is provided with a through hole for the piston rod to pass through, and one end surface of the piston is concave to form a first annular hole, the inner diameter of the first annular hole is larger than the piston rod and is provided with an internal thread; A compression ring, which is composed of a plurality of annular parts, the plurality of annular parts can be embedded in the annular groove of the piston rod along the radial direction of the piston rod, and the overall outer diameter of the compression ring is larger than the piston rod and smaller than the inner diameter of the first annular hole; The annular nut is provided with an external thread. The annular nut can be inserted into the piston rod and threadedly connected with the first annular hole of the piston. The annular nut presses the pressure ring to the piston.

2. A double-outlet piston rod structure according to claim 1, characterized in that: The pressure ring is formed by splicing two symmetrical half rings.

3. A double-outlet piston rod structure according to claim 1, characterized in that: The end surface of the annular nut close to the pressure ring is concave to form a second annular hole, and the pressure ring is entirely embedded in the second annular hole.

4. A double-outlet piston rod structure according to claim 1, characterized in that: The annular nut is integrally embedded in the first annular hole of the piston.

5. A double-outlet piston rod structure according to claim 4, characterized in that: The end surface of the annular nut away from the pressure ring is provided with a slot.

6. A double-outlet piston rod structure according to claim 1, characterized in that: A conical guide surface is provided at one end of the first annular hole close to the annular nut.

7. The double-outlet piston rod structure according to claim 1, characterized in that: A sealing groove is provided in the middle of the outer peripheral wall of the piston, and the sealing groove is used for installing a sealing sleeve.

8. The double-outlet piston rod structure according to claim 1, characterized in that: Both ends of the piston rod are respectively provided with mounting screw holes and clamping planes.

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