Anti-rotation structure of large hydraulic cylinder piston

Abstract

The utility model discloses an anti-rotation structure of a piston of a large hydraulic cylinder, relates to the technical field of parts of die-casting machines, and aims to solve the problems that the limiting effect of the piston cylinder and the piston rotating relatively around an axis is poor, and the axial guide precision of an anti-rotation limiting structure is low. The anti-rotation connecting base and the anti-rotation guide rod are arranged to slide in a matched mode to conduct anti-rotation limiting on the piston, the guide accuracy of axial movement stress of the piston is improved, and abrasion loss of the inner wall of the piston cylinder and the matching face of the piston is reduced. By arranging the first lubricating channel, the lubricating circulation groove, the guide sliding hole and the second lubricating channel, the coaxiality between the piston and the side wall of the piston cavity is improved, and the possibility that the axial sliding fit surface of the piston is damaged due to component force deviating from the axial direction is reduced; and the rotation limiting effect of the anti-rotation guide rod on the anti-rotation connecting seat and the piston is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of die-casting machine parts, in particular to an anti-rotation structure of a large hydraulic cylinder piston. Background Art

[0002] In die-casting machines or other molding processing techniques and equipment, hydraulic cylinders are usually required. In die-casting machine parts, especially those that require mold opening and closing movement drive, parts movement matching guide, and providing push-pull driving force, the use of piston cylinders is indispensable.

[0003] In the prior art, the matching surface between the piston rod and the piston cylinder is usually a circular matching surface. When the piston rod slides axially in the piston cylinder, gaps and leakages often occur at the matching point between the piston rod and the piston cylinder due to guide installation errors and radial forces on the piston rod. In addition, during use, the piston rod is easily subjected to a reaction force, causing the piston rod and the piston cylinder to rotate relative to each other around the axial direction, which easily aggravates the sliding wear between the piston rod and the piston cylinder, resulting in a reduction in the service life of the piston cylinder.

[0004] In the prior art, for example, Chinese invention patent CN106945242A discloses a two-plate clamping device, which maintains thrust on the brake assembly and the clamping cylinder assembly by arranging an elastic member, so that the contact end faces between the brake assembly and the clamping cylinder assembly are separated to reduce mechanical impact and direct scratching and wear of the clamping piston end face, and prevents the piston assembly from turning by arranging two anti-rotation guide rods between the front cover of the clamping cylinder and the clamping piston assembly; in this invention patent, the anti-rotation guide rod is arranged in the internal structure of the piston and the guide rod, and the matching limit between the anti-rotation guide rod and the clamping piston may have a poor anti-rotation guiding effect, and the anti-rotation guide direction may be easily deflected, resulting in poor anti-rotation function.

[0005] For example, Chinese utility model patent CN214867130U discloses a large oil cylinder anti-rotation structure. In this technical solution, an anti-rotation pin is placed between the tail plate and the locking piston to prevent the oil cylinder from relative rotation due to force when the mold is opened or closed. The anti-rotation pin is directly connected between the two mating surfaces, which may cause installation difficulties and axial guide deviations that may lead to structural damage or failure of the anti-rotation limit. Utility Model Content

[0006] The utility model aims to provide an anti-rotation structure for a large hydraulic cylinder piston, so as to solve the problems of poor limiting effect of relative rotation around the axis between the piston cylinder and the piston and low axial guiding accuracy of the anti-rotation limiting structure.

[0007] In order to solve the above technical problems, the utility model specifically provides the following technical solutions:

[0008] An anti-rotation structure for a large hydraulic cylinder piston comprises a piston cylinder body, a piston cavity is arranged in the piston cylinder body, a first piston end cover is fixedly connected to the left end surface of the piston cylinder body, a second piston end cover is fixedly connected to the right end surface of the piston cylinder body, a piston is slidably connected in the piston cavity, an anti-rotation connection seat is arranged at the right end of the piston, an anti-rotation guide rod is fixedly connected to the right end of the second piston end cover, and the right end of the anti-rotation guide rod is slidably connected to the anti-rotation connection seat;

[0009] By setting an anti-rotation connecting seat and an anti-rotation guide rod to cooperate and slide to limit the piston, the guiding accuracy of the axial movement force of the piston is improved, the wear and loss of the inner wall of the piston cylinder and the piston mating surface is reduced, and the sliding fit effect and service life of the inner wall of the piston cylinder and the piston mating surface are improved.

[0010] Preferably, a guide rod mounting hole is opened on the right end face of the second piston end cover, and an anti-rotation guide rod is fixedly connected in the guide rod mounting hole; the parallelism between the guide rod mounting hole and the piston is improved, the accuracy of the anti-rotation limit guide of the guide rod mounting hole is improved, and the anti-rotation effect of the piston is improved.

[0011] Preferably, the right end of the anti-rotation guide rod is slidably connected with a guide sleeve, and a guide receiving cavity is provided in the anti-rotation connecting seat, and the guide sleeve is rotatably connected in the guide receiving cavity; the convenience of disassembly, assembly and maintenance of the anti-rotation structure is improved, and the axial guiding accuracy of the piston anti-rotation limit is improved.

[0012] Preferably, the right end face of the piston is fixedly connected with a docking shaft, a docking positioning surface is provided on the circumferential side face of the docking shaft, and the upper end face of the anti-rotation connection seat is fixedly connected with the docking positioning surface;

[0013] The stability of maintaining the distance between the axis of the piston and the axis of the anti-rotation guide rod is improved, and the axial guiding accuracy of the anti-rotation guide rod to the piston is improved.

[0014] Preferably, the left end face of the second piston end cover is fixedly connected with a stop key, and the right end face of the piston cylinder body is provided with a radial limit groove slidably connected to the stop key; the sealing performance of the piston cylinder is improved, and the accuracy and reliability of the axial sliding guide of the piston are improved.

[0015] Preferably, a first oil inlet and outlet is provided in the first piston end cover, and a second oil inlet and outlet is provided in the second piston end cover; thereby improving the axial force stability of the piston.

[0016] Preferably, a group of evenly distributed extended positioning holes are provided in the circumferential direction of the right end surface of the piston, and a group of evenly distributed extended mounting holes are provided in the circumferential direction of the docking shaft;

[0017] The possibility of the anti-rotation connection seat transmitting the axial sliding guide direction via the docking shaft deviating from the piston axis is reduced, and the transmission and limiting accuracy of the piston anti-rotation axial guide is improved.

[0018] Preferably, an anti-rotation positioning hole is provided in the docking positioning surface, an anti-rotation fixing hole is provided at the upper end of the anti-rotation connecting seat, and anti-rotation connecting studs are provided in the anti-rotation fixing hole and the anti-rotation positioning hole;

[0019] The connection positioning accuracy of the anti-rotation limit transmitted by the anti-rotation connection seat is improved, and the stability of the limiting effect of preventing the piston from rotating and the anti-rotation limit accuracy are improved.

[0020] Preferably, a first lubrication channel is provided in the side wall of the guide receiving cavity, a lubrication flow groove is provided in the outer side surface of the guide sleeve, a guide sliding hole is provided in the guide sleeve, an anti-rotation guide rod is slidably connected in the guide sliding hole, and a second lubrication channel is provided in the side wall of the guide sliding hole;

[0021] By providing the first lubrication channel, the lubrication flow groove, the guide sliding hole and the second lubrication channel, the coaxiality between the piston and the side wall of the piston chamber is improved, the possibility of the piston axial sliding fitting surface being damaged by the force deviating from the axial direction is reduced, the rotation limiting effect of the anti-rotation guide rod on the anti-rotation connecting seat and the piston is improved, the anti-rotation guiding stability of the piston is improved, and the service life of the cylinder is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0023] Figure 1 This is a schematic diagram of the overall assembly structure of an anti-rotation structure of a large hydraulic cylinder piston of the utility model;

[0024] Figure 2 It is a front view schematic diagram of an anti-rotation structure of a large hydraulic cylinder piston of the utility model;

[0025] Figure 3 yes Figure 2 A right side schematic diagram of

[0026] Figure 4 yes Figure 3 AA cross-sectional view in FIG.

[0027] Figure 5 yes Figure 3 BB cross-sectional view in FIG.

[0028] Figure 6 yes Figure 2 Schematic diagram of CC cross-section in FIG.

[0029] Figure 7 yes Figure 3 A partial enlarged schematic diagram of point E in the middle;

[0030] Figure 8 yes Figure 2 A partial enlarged schematic diagram of point F in the middle;

[0031] Fig. 9 yes Figure 5 A partial enlarged schematic diagram of the G in the middle;

[0032] Fig.10 yes Fig. 9 A local enlarged schematic diagram of the H in the middle;

[0033] Fig.11 yes Fig.10 A partial enlarged schematic diagram of the J in the middle;

[0034] Fig.12 yes Figure 6 A local enlarged schematic diagram of the K in the middle;

[0035] Fig.13 yes Figure 1 Schematic diagram of the three-dimensional structure of the central docking shaft;

[0036] Fig.14 yes Fig.13 A schematic diagram of the main view;

[0037] Fig.15 yes Figure 1 Schematic diagram of the assembly relationship between the middle anti-rotation connecting seat and the anti-rotation guide rod;

[0038] Fig.16 yes Fig.15 Schematic diagram of the three-dimensional structure of the middle anti-rotation connection seat;

[0039] Fig.17 yes Fig.15 Schematic diagram of the three-dimensional structure of the middle guide sleeve;

[0040] Fig.18 yes Figure 1 Schematic diagram of the assembly relationship at the middle docking shaft.

[0041] Figure numbers: piston cylinder 10; second piston end cover 11; docking shaft 12; anti-rotation connecting seat 13; anti-rotation guide rod 14; first piston end cover 15; piston chamber 16; first oil inlet and outlet 17; guide rod mounting hole 20; extension mounting hole 21; extension positioning hole 22; guide receiving chamber 23; guide sleeve 24; axial limit groove 25; lubrication flow groove 26; docking positioning surface 27; guide slide hole 28; second lubrication channel 29; piston 30; first lubrication channel 31; anti-rotation fixing hole 32; anti-rotation positioning hole 33; anti-rotation key 34; second oil inlet and outlet 35; guide rail fixing seat 36; guide connecting bracket 37; guide track frame 38; anti-rotation connecting stud 43. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

[0044] Embodiment 1

[0045] Refer to the attached Figure 1 To Attachment Figure 6 As shown, the utility model provides an anti-rotation structure of a large hydraulic cylinder piston, including a piston cylinder body 10, a piston chamber 16 is arranged in the piston cylinder body 10, a first piston end cover 15 is fixedly connected to the left end surface of the piston cylinder body 10, the first piston end cover 15 seals the rodless chamber at the left end of the piston chamber 16, a second piston end cover 11 is fixedly connected to the right end surface of the piston cylinder body 10, the second piston end cover 11 seals the rod chamber at the right end of the piston chamber 16, a piston 30 is slidably connected in the piston chamber 16, an anti-rotation connecting seat 13 is arranged at the right end of the piston 30, the anti-rotation connecting seat 13 and the piston 30 are rigidly connected to maintain a synchronous motion state between the two, an anti-rotation guide rod 14 is fixedly connected to the right end of the second piston end cover 11, the right end of the anti-rotation guide rod 14 is slidably connected to the anti-rotation connecting seat 13, and the anti-rotation guide rod 14 limits the rotation of the piston 30 rigidly connected to the anti-rotation connecting seat 13 around its axis;

[0046] The anti-rotation guide rod 14 and the second piston end cover 11 are relatively fixed and maintain a synchronous moving state, and the docking shaft 12 and the anti-rotation connecting seat 13 are relatively fixed. When the piston 30 slides axially in the piston cavity 16, the anti-rotation connecting seat 13 is driven to move axially synchronously. At this time, the anti-rotation connecting seat 13 slides on the guide track at the right end of the anti-rotation guide rod 14, and the anti-rotation guide rod 14 limits the freedom of the anti-rotation connecting seat 13 to rotate around the axis of the piston 30. The anti-rotation connecting seat 13 can follow the axial movement of the piston 30 and limit the freedom of the piston 30 to rotate around its axis, thereby improving the guiding accuracy of the axial movement force of the piston 30, reducing the wear and loss of the inner wall of the piston cylinder and the piston mating surface, and improving the sliding matching effect and service life of the inner wall of the piston cylinder and the piston mating surface.

[0047] Refer to the attached Figure 3 , Attachment Figure 5 And attached Fig. 9 As shown, a guide rod mounting hole 20 is provided on the right end surface of the second piston end cover 11, and an anti-rotation guide rod 14 is fixedly connected in the guide rod mounting hole 20;

[0048] The second piston end cover 11 fixes the anti-rotation guide rod 14 through the guide rod mounting hole 20, which can improve the positioning accuracy of the guide rod mounting hole 20, improve the parallelism between the guide rod mounting hole 20 and the piston 30, improve the accuracy of the anti-rotation limit guide of the guide rod mounting hole 20, and improve the anti-rotation effect of the piston 30.

[0049] Refer to the attached Figure 7 To Attachment Fig.10 As shown, the right end of the anti-rotation guide rod 14 is slidably connected with a guide sleeve 24, and the anti-rotation connection seat 13 is provided with a guide receiving cavity 23, and the guide receiving cavity 23 is rotatably connected with the guide sleeve 24;

[0050] The anti-rotation connecting seat 13 is rotatably connected to the guide sleeve 24 through the guide receiving chamber 23, and the guide sleeve 24 and the anti-rotation connecting seat 13 maintain synchronous axial movement. The anti-rotation connecting seat 13 slides on the right end of the anti-rotation guide rod 14 through the guide sleeve 24, which improves the convenience of disassembly, assembly and maintenance of the anti-rotation structure. The guide sleeve 24 decomposes the sliding cooperation between the anti-rotation connecting seat 13 and the anti-rotation guide rod 14 into the circumferential rotation cooperation between the guide sleeve 24 and the anti-rotation connecting seat 13 and the axial sliding cooperation between the guide sleeve 24 and the anti-rotation guide rod 14, which is convenient for direct maintenance and adjustment of the axial sliding between the anti-rotation connecting seat 13 and the anti-rotation guide rod 14, avoids the influence of the radial component force generated by the rigid connection between the anti-rotation connecting seat 13 and the anti-rotation guide rod 14 on the axial sliding guide of the anti-rotation connecting seat 13 on the anti-rotation guide rod 14, and improves the axial guiding accuracy of the anti-rotation limit of the piston 30.

[0051] Refer to the attached Figure 1 And attached Figure 6 To Attachment Fig. 9 As shown, the right end face of the piston 30 is fixedly connected to the docking shaft 12, a docking positioning surface 27 is provided on the circumferential side face of the docking shaft 12, and the upper end face of the anti-rotation connection seat 13 is fixedly connected to the docking positioning surface 27;

[0052] The docking shaft 12 is positioned and installed with the anti-rotation connecting seat 13 through the docking positioning surface 27, which can improve the accuracy of the connection and positioning between the docking shaft 12 and the anti-rotation guide rod 14, thereby improving the stability of the distance between the axis of the piston 30 and the axis of the anti-rotation guide rod 14, improving the smoothness and stability of the axial sliding fit of the anti-rotation guide, and improving the axial guiding accuracy of the anti-rotation guide rod 14 to the piston 30.

[0053] Refer to the attached Figure 1 To Attachment Figure 4As shown, the left end surface of the second piston end cover 11 is fixedly connected with a rotation stop key 34, and the right end surface of the piston cylinder body 10 is provided with a radial limiting groove slidably connected with the rotation stop key 34;

[0054] The piston 30 limits the freedom of the second piston end cover 11 to rotate around the axis of the piston 30 through the stop key 34, thereby improving the connection rigidity between the piston cylinder body 10 and the second piston end cover 11, and preventing the piston 30 fixedly connected to the docking shaft 12 from transmitting friction through the mating surface to drive the second piston end cover 11 to rotate locally on the end surface of the piston cylinder body 10, thereby affecting the sealing of the mating surface between the second piston end cover 11 and the piston cylinder body 10, thereby improving the sealing performance of the piston cylinder, limiting the sliding mating surface of the piston 30 to the mating surface between the side wall of the piston cavity 16 and the inner wall of the second piston end cover 11, reducing the influence of the assembly error between the piston cylinder body 10 and the second piston end cover 11 on the anti-rotation limit of the piston 30, and improving the accuracy and reliability of the axial sliding guide of the piston 30.

[0055] Refer to the attached Figure 1 To Attachment Figure 5 As shown, a first oil inlet and outlet port 17 is provided in the first piston end cover 15, and the first oil inlet and outlet port 17 is communicated with the rodless cavity at the left end of the piston cavity 16. A second oil inlet and outlet port 35 is provided in the second piston end cover 11, and the second oil inlet and outlet port 35 is communicated with the rod cavity at the right end of the piston cavity 16. By taking pressure oil in and out of the first oil inlet and outlet port 17 and the second oil inlet and outlet port 35, the convenience of reverse switching of the force of the piston 30 when the sliding driving direction of the piston 30 in the piston cavity 16 changes is facilitated, thereby improving the axial force stability of the piston 30.

[0056] Refer to the attached Figure 3 To Attachment Figure 5 And attached Fig. 9 As shown, a group of evenly distributed extended positioning holes 22 are opened in the circumferential direction of the right end surface of the piston 30, and a group of evenly distributed extended mounting holes 21 are opened in the circumferential direction of the docking shaft 12. Screws are arranged in the extended mounting holes 21 and the extended positioning holes 22, and the docking shaft 12 is fixedly connected to the piston 30 by screws;

[0057] By setting the extended mounting hole 21 and the extended positioning hole 22, positioning is provided for the fixed fit between the piston 30 and the docking shaft 12, thereby improving the coaxiality between the docking shaft 12 and the piston 30, reducing the possibility of the anti-rotation connecting seat 13 transmitting the axial sliding guide direction through the docking shaft 12 deviating from the axis of the piston 30, and improving the transmission and limiting accuracy of the anti-rotation axial guide of the piston 30.

[0058] Refer to the attached Figure 2 , Attachment Figure 5 , Attachment Figure 6 , Attachment Fig.12 , Attachment Fig.15 And attached Fig.16As shown, an anti-rotation positioning hole 33 is opened in the docking positioning surface 27, an anti-rotation fixing hole 32 is provided at the upper end of the anti-rotation connecting seat 13, and an anti-rotation connecting stud 43 is provided in the anti-rotation fixing hole 32 and the anti-rotation positioning hole 33, and the anti-rotation connecting seat 13 is fixedly connected to the docking shaft 12 through the anti-rotation connecting stud 43;

[0059] The anti-rotation positioning hole 33 arranged in the docking positioning surface 27 and the anti-rotation fixing hole 32 opened at the upper end of the anti-rotation connecting seat 13 provide positioning for the anti-rotation connecting stud 43. The docking shaft 12 is fixedly connected to the anti-rotation connecting seat 13 through the anti-rotation connecting stud 43. The anti-rotation connecting stud 43 can limit the freedom of the anti-rotation connecting seat 13 to rotate around the normal direction of the docking positioning surface 27. The docking positioning surface 27 can limit the rotation and sliding of the anti-rotation connecting seat 13 in the circumferential direction of the docking shaft 12, thereby improving the connection positioning accuracy of the anti-rotation connecting seat 13 transmitting the anti-rotation limit, and improving the stability of the limiting effect and the anti-rotation limit accuracy of preventing the piston 30 from rotating.

[0060] Refer to the attached Figures 10 to 17 As shown, a first lubrication channel 31 is provided in the side wall of the guide receiving chamber 23, the first lubrication channel 31 is communicated with the guide receiving chamber 23, a lubrication flow groove 26 is provided in the outer side surface of the guide sleeve 24, a guide slide hole 28 is provided in the guide sleeve 24, the guide slide hole 28 is slidably connected with the anti-rotation guide rod 14, a second lubrication channel 29 is provided in the side wall of the guide slide hole 28, the second lubrication channel 29 is communicated with the lubrication flow groove 26, the second lubrication channel 29 runs through the side wall of the guide slide hole 28, and the positions of the first lubrication channel 31 and the lubrication flow groove 26 correspond to each other;

[0061] An axial limit groove 25 is provided in the guide receiving chamber 23, and the anti-rotation connecting seat 13 limits the axial sliding between the guide sleeve 24 and the anti-rotation connecting seat 13 through the axial limit groove 25. The first lubrication channel 31 can allow lubricant to enter the guide receiving chamber 23 to lubricate the rotating matching surface between the guide sleeve 24 and the guide receiving chamber 23, and the lubrication flow groove 26 can guide the lubricant through the second lubrication channel 29 to the sliding matching surface between the guide sliding hole 28 and the anti-rotation guide rod 14 for lubrication;

[0062] The mating surface between the lubrication circulation groove 26 and the anti-rotation guide rod 14 is annular. The anti-rotation guide rod 14 can limit the freedom of the guide sleeve 24 and the anti-rotation connecting seat 13 to move in the radial direction of the anti-rotation guide rod 14, thereby limiting the movement of the piston 30 in its radial direction, reducing the radial deflection of the piston 30 during the axial sliding process, improving the matching accuracy between the piston 30 and the circumferential side wall of the piston cavity 16, improving the separation and sealing effect of the piston 30 on the left and right ends of the piston cavity 16, improving the coaxiality between the piston 30 and the side wall of the piston cavity 16, reducing the possibility of the axial sliding matching surface of the piston 30 being damaged by the force deviating from the axial direction, improving the rotation limiting effect of the anti-rotation guide rod 14 on the anti-rotation connecting seat 13 and the piston 30, improving the anti-rotation guiding stability of the piston 30, and improving the service life of the cylinder.

[0063] Embodiment 2

[0064] Refer to the attached Figure 2 , Attachment Figure 8 , Attachment Fig. 9 And attached Fig.18 As shown, the anti-rotation guide rod 14 can be replaced by a guide rail frame 38, and a guide rail fixing seat 36 is fixedly connected to the right end of the second piston end cover 11, and a guide connection bracket 37 is fixedly connected to the right end of the docking shaft 12. The right end of the guide rail fixing seat 36 is fixedly connected to the guide rail frame 38, and the right end of the guide rail frame 38 is slidably connected to the guide connection bracket 37. The guide rail frame 38 can provide axial sliding guidance for the docking shaft 12 and the guide connection bracket 37 as a whole, and at the same time limit the freedom of the guide connection bracket 37 to rotate around the axis of the docking shaft 12, which can prevent the docking shaft 12 from rotating relative to the axis of the second piston end cover 11, can improve the versatility of the anti-rotation structure, and improve the scope of use of the anti-rotation structure.

[0065] Embodiment 3

[0066] Refer to the attached Fig.18 As shown, a sliding fit can also be adopted between the guide rail frame 38 and the guide rail fixing seat 36. The right end of the guide rail fixing seat 36 is slidably connected to the guide rail frame 38, and the right end of the guide rail frame 38 is fixedly connected to the guide connection bracket 37. When the docking shaft 12 drives the guide connection bracket 37 to move synchronously, it drives the guide rail frame 38 to slide synchronously in the axial direction of the docking shaft 12. The guide rail frame 38 slides and extends at the right end of the guide rail fixing seat 36, thereby following the axial sliding of the docking shaft 12 to support it when preventing the docking shaft 12 from rotating around its axis. This can effectively ensure the anti-rotation limiting effect when the lead of the docking shaft 12 is long, improve the anti-rotation limiting stability of the piston rod, and improve the compactness and application range of the piston rod anti-rotation structure.

[0067] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the utility model, and are not intended to limit the implementation methods of the technology of the utility model in any form. Any technical personnel in this field may make slight changes or replace them with other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the utility model, but they should still be regarded as technologies or embodiments that are essentially the same as the utility model.

[0068] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. An anti-rotation structure for a large hydraulic cylinder piston, comprising a piston cylinder body (10), wherein a piston cavity (16) is provided in the piston cylinder body (10), a first piston end cover (15) is fixedly connected to the left end surface of the piston cylinder body (10), a second piston end cover (11) is fixedly connected to the right end surface of the piston cylinder body (10), and a piston (30) is slidably connected in the piston cavity (16), characterized in that: An anti-rotation connection seat (13) is provided at the right end of the piston (30), an anti-rotation guide rod (14) is fixedly connected to the right end of the second piston end cover (11), and the right end of the anti-rotation guide rod (14) is slidably connected to the anti-rotation connection seat (13).

2. According to the anti-rotation structure of a large hydraulic cylinder piston as described in claim 1, it is characterized in that: A guide rod mounting hole (20) is formed on the right end surface of the second piston end cover (11), and the anti-rotation guide rod (14) is fixedly connected in the guide rod mounting hole (20).

3. According to the anti-rotation structure of a large hydraulic cylinder piston as described in claim 2, it is characterized in that: The right end of the anti-rotation guide rod (14) is slidably connected to a guide sleeve (24), and a guide receiving chamber (23) is provided in the anti-rotation connection seat (13), and the guide sleeve (24) is rotatably connected in the guide receiving chamber (23).

4. According to the anti-rotation structure of a large hydraulic cylinder piston as described in claim 3, it is characterized in that: The right end surface of the piston (30) is fixedly connected to a docking shaft (12), a docking positioning surface (27) is provided on a circumferential side surface of the docking shaft (12), and the upper end surface of the anti-rotation connection seat (13) is fixedly connected to the docking positioning surface (27).

5. The anti-rotation structure of a large hydraulic cylinder piston according to any one of claims 1 to 4, characterized in that: A detent key (34) is fixedly connected to the left end surface of the second piston end cover (11), and a radial limiting groove is provided on the right end surface of the piston cylinder body (10) for slidably connecting the detent key (34).

6. The anti-rotation structure of a large hydraulic cylinder piston according to claim 5, characterized in that: A first oil inlet and outlet (17) is provided in the first piston end cover (15), and a second oil inlet and outlet (35) is provided in the second piston end cover (11).

7. The anti-rotation structure of a large hydraulic cylinder piston according to claim 4, characterized in that: A group of evenly distributed extending positioning holes (22) are provided on the right end surface of the piston (30) in the circumferential direction, and a group of evenly distributed extending mounting holes (21) are provided on the docking shaft (12) in the circumferential direction.

8. The anti-rotation structure of a large hydraulic cylinder piston according to claim 7, characterized in that: An anti-rotation positioning hole (33) is provided in the docking positioning surface (27), an anti-rotation fixing hole (32) is provided at the upper end of the anti-rotation connecting seat (13), and anti-rotation connecting studs (43) are provided in the anti-rotation fixing hole (32) and the anti-rotation positioning hole (33).

9. The anti-rotation structure of a large hydraulic cylinder piston according to claim 3, characterized in that: A first lubrication channel (31) is provided in the side wall of the guide receiving cavity (23), a lubrication flow groove (26) is provided in the outer side surface of the guide sleeve (24), a guide sliding hole (28) is provided in the guide sleeve (24), the guide sliding hole (28) is slidably connected to the anti-rotation guide rod (14), and a second lubrication channel (29) is provided in the side wall of the guide sliding hole (28).

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