CN114135536A

CN114135536A - Hydraulic oil cylinder

Info

Publication number: CN114135536A
Application number: CN202111160671.0A
Authority: CN
Inventors: 曾文则; 孟华; 许东; 刘帅; 张勇
Original assignee: Wuhan Marine Machinery Plant Co Ltd
Current assignee: Wuhan Marine Machinery Plant Co Ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-03-04

Abstract

The disclosure provides a hydraulic oil cylinder, and belongs to the field of mechanical equipment. The hydraulic oil cylinder comprises an oil cylinder body and two connecting components; two coupling assembling is located respectively the both sides of the axis of hydro-cylinder body, coupling assembling includes fixed knot structure, sliding part and connecting piece, sliding part movably with fixed knot constructs the connection, the connecting piece respectively with fixed knot constructs with sliding part detachably links to each other. The two sides of the axis of the oil cylinder body are respectively connected with the two sliding parts in a rotating mode, and a rotating surface formed by the rotation of the oil cylinder body is parallel to the moving direction of the sliding parts. This openly passes through hydraulic cylinder, can make the hydro-cylinder body swing.

Description

Hydraulic oil cylinder

Technical Field

The disclosure belongs to the field of mechanical equipment, and particularly relates to a hydraulic oil cylinder.

Background

The hydraulic oil cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and makes linear reciprocating motion (or swinging motion). In the detection process of a large or heavy test platform, the hydraulic oil cylinder plays a significant role.

Among the correlation technique, hydraulic cylinder includes hydro-cylinder body and coupling assembling, and coupling assembling and the outer wall connection of hydro-cylinder body, coupling assembling are arranged in fixing the hydro-cylinder body in corresponding service environment.

However, in some specific use environments, it is necessary that the cylinder body not only output a linear reciprocating motion, but also be capable of performing a circumferential swing motion with an axis perpendicular to the cylinder body as an axis. At this time, the above apparatus cannot satisfy the above requirements.

Disclosure of Invention

The embodiment of the disclosure provides a hydraulic cylinder, which can enable a cylinder body to swing. The technical scheme is as follows:

the embodiment of the disclosure provides a hydraulic oil cylinder, which comprises an oil cylinder body and two connecting components;

the two connecting assemblies are respectively positioned on two sides of the axis of the oil cylinder body and comprise a fixed structure, a sliding piece and a connecting piece, the sliding piece is movably connected with the fixed structure, and the connecting piece is detachably connected with the fixed structure and the sliding piece respectively;

the two sides of the axis of the oil cylinder body are respectively connected with the two sliding parts in a rotating mode, and a rotating surface formed by the rotation of the oil cylinder body is parallel to the moving direction of the sliding parts.

In another implementation manner of the present disclosure, a side wall of the fixing structure facing the oil cylinder body is provided with a long hole and a plurality of clamping holes;

the length direction of the long hole is the same as the moving direction of the sliding piece;

the clamping holes are arranged at intervals along the length direction of the strip holes;

the sliding piece is movably located at the position of the long strip hole and is connected with the fixed structure through the clamping hole.

In another implementation of the present disclosure, the glide includes a base plate and a sleeve;

the sleeve is inserted in the middle of the substrate and is positioned in the long strip hole;

the outer edge of the substrate is provided with at least two connecting holes, each connecting hole corresponds to one of the clamping holes, and the connecting piece is positioned in the connecting holes and the corresponding clamping holes.

In another implementation manner of the present disclosure, the cylinder body includes a cylinder body and a connecting ear ring;

the connecting earrings are coaxially sleeved on the outer wall of the cylinder body, and two sides of the axis of the connecting earrings are respectively and rotatably inserted into the sliding piece.

In another implementation of the present disclosure, the connecting earring includes a connecting ring, two trunnions, and two wear sleeves;

the two trunnions are coaxially arranged and are respectively connected to the outer wall of the connecting ring, and the axes of the trunnions extend along the radial direction of the connecting ring;

the wear-resistant sleeves correspond to the trunnions one to one, the wear-resistant sleeves are sleeved on the corresponding trunnions, and the outer walls of the wear-resistant sleeves are rotatably connected with the sliding parts;

the connecting ring is coaxially sleeved on the outer wall of the cylinder body.

In another implementation manner of the disclosure, the trunnion is provided with a plurality of annular grooves arranged at intervals along the axial direction of the trunnion;

the inner wall of the wear-resistant sleeve is provided with a plurality of annular bulges arranged at intervals along the axial direction of the inner wall, the annular bulges are arranged in one-to-one correspondence with the annular grooves, and the annular bulges are positioned in the corresponding annular grooves.

In another implementation of the disclosure, each of the trunnions has a communication hole along its own axis, one of the two communication holes communicates with the rodless chamber of the cylinder, and the other of the two communication holes communicates with the rod chamber of the cylinder;

the hydraulic oil cylinder further comprises two joint assemblies, the two joint assemblies correspond to the fixed structures one to one, the first ends of the joint assemblies are connected with the corresponding fixed structures and communicated with the communicating holes, and the second ends of the joint assemblies are communicated with an external pump station.

In another implementation of the present disclosure, the joint assembly includes a fixed joint and a jointed tubing;

the first end of the joint oil pipe is communicated with the first end of the fixing sleeve, the second end of the joint oil pipe is communicated with the corresponding communication hole, and the joint oil pipe is positioned in the fixing structure;

the fixed joint is connected with the fixed structure, and the second end of the fixed joint is communicated with an external pump station.

In another implementation of the present disclosure, the joint tubing is a hose.

In another implementation manner of the present disclosure, the cylinder body further includes a first cylinder oil pipe and a second cylinder oil pipe;

the first oil cylinder oil pipe and the second oil cylinder oil pipe are respectively positioned on two sides of the axis of the cylinder body and are connected with the connecting ring;

the first end of the first oil cylinder oil pipe is communicated with one of the two communicating holes, and the second end of the first oil cylinder oil pipe is communicated with the rodless cavity of the cylinder body;

and the first end of the oil pipe of the second oil cylinder is communicated with the other of the two communicating holes, and the second end of the oil pipe of the second oil cylinder is communicated with the rod cavity of the oil cylinder body.

The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:

when the hydraulic cylinder provided by the embodiment of the disclosure is used, because the hydraulic cylinder comprises a cylinder body and a connecting assembly, and the connecting assembly comprises a fixed structure, a sliding part and a connecting piece, the hydraulic cylinder can be connected with the cylinder body through the sliding part, the sliding part is connected with external equipment through the fixed structure, the sliding part is fixed on the fixed structure through the connecting piece, so that the cylinder body can rotate relative to the fixed structure, so that when the hydraulic cylinder is used, the cylinder body can output linear motion and can swing, the mounting position of the cylinder body can be adjusted along with the sliding part, and specific use requirements are met.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a hydraulic cylinder provided in an embodiment of the present disclosure;

FIG. 2 is a top view of a connection structure of a fixed structure and a glide according to an embodiment of the present disclosure;

FIG. 3 is a schematic view along direction B in FIG. 2;

fig. 4 is a schematic structural diagram of an overall structure of the cylinder body and the connecting earrings and the like provided by the embodiment of the disclosure;

FIG. 5 is a schematic view of a connecting earring according to an embodiment of the present disclosure;

FIG. 6 is a front view of the cylinder body provided by the embodiment of the present disclosure;

fig. 7 is a sectional view taken along a-a of fig. 6.

The symbols in the drawings represent the following meanings:

1. an oil cylinder body; 11. a cylinder body; 111. a first end cap; 1111. a first oil port; 112. a second end cap; 1121. a second oil port; 113. an intermediate barrel; 114. a piston; 115. a piston rod; 12. connecting an earring; 121. a connecting ring; 122. a trunnion; 1221. a communicating hole; 1222. an annular groove; 123. a wear-resistant sleeve; 1231. an annular projection; 13. a first cylinder oil pipe; 14. a second cylinder oil pipe; 15. a displacement sensor; 16. connecting a joint;

2. a connecting assembly; 21. a fixed structure; 211. a strip hole; 212. a clamping hole; 213. a support; 214. a box body;

22. a sliding member; 221. a substrate; 2212. connecting holes; 222. a sleeve; 23. a connecting member;

3. a joint assembly; 31. fixing the joint; 32. and (5) connecting an oil pipe.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

The embodiment of the disclosure provides a hydraulic oil cylinder, and as shown in fig. 1, the hydraulic oil cylinder comprises an oil cylinder body 1 and a connecting assembly 2. The two connecting assemblies 2 are respectively positioned on two sides of the axis of the oil cylinder body 1.

Fig. 2 is a top view of a partial structure of a fixing structure according to an embodiment of the present disclosure, and in conjunction with fig. 2, the connecting assembly 2 includes a fixing structure 21, a sliding member 22, and a connecting member 23, the sliding member 22 is movably connected with the fixing structure 21, and the connecting member 23 is detachably connected with the fixing structure 21 and the sliding member 22, respectively.

Two sides of the axis of the oil cylinder body 1 are respectively connected with the two sliding pieces 22 in a rotating way, and a rotating surface formed by the rotation of the oil cylinder body 1 is parallel to the moving direction of the sliding pieces 22.

When the hydraulic cylinder provided by the embodiment of the disclosure is used, because the hydraulic cylinder comprises the cylinder body 1 and the connecting assembly 2, and the connecting assembly 2 comprises the fixed structure 21, the sliding piece 22 and the connecting piece 23, so that the hydraulic cylinder can be connected with the cylinder body 1 through the sliding piece 22, the hydraulic cylinder is connected with external equipment through the fixed structure 21, the sliding piece 22 is fixed on the fixed structure 21 through the connecting piece 23, so that the cylinder body 1 can rotate relative to the fixed structure 21, so that when the hydraulic cylinder is used, the cylinder body 1 not only can output linear motion and can swing, but also can follow the sliding piece 22 to adjust the installation position of the cylinder body 1, and specific use requirements are met.

Fig. 3 is a schematic view along direction B in fig. 2, and in conjunction with fig. 3, optionally, a side wall of the fixing structure 21 facing the cylinder body 1 has a long hole 211 and a plurality of clamping holes 212.

The longitudinal direction of the elongated hole 211 is the same as the moving direction of the slider 22. The plurality of catching holes 212 are arranged at intervals along the length direction of the elongated hole 211. The sliding member 22 is movably located at the elongated hole 211 and connected to the fixing structure 21 through the engaging hole 212.

In the above implementation, the fixed structure 21 is used to provide a support and mounting base for the glides 22 and the like. The sliding part 22 is used for being connected with the oil cylinder body 1, so that the oil cylinder body 1 can rotate relative to the sliding part 22, and further the oil cylinder body 1 rotates.

The fixing structure 21 is provided with a long hole 211 and a plurality of clamping holes 212, and the connecting member 23 can be inserted into the clamping holes 212 and the sliding member 22, so as to fix the sliding member 22 on the fixing structure 21. And the arrangement of the long hole 211 can facilitate the rotating shaft of the oil cylinder body 1 to have a moving space, and the oil cylinder body can conveniently move along with the sliding piece 22.

In the present embodiment, the connection member 23 includes a bolt, a washer, a nut, and the like.

Optionally, glide 22 includes base 221 and sleeve 222. The sleeve 222 is inserted into the middle of the substrate 221, and the sleeve 222 is located in the elongated hole 211. At least two connecting holes 2212 are formed in the outer edge of the substrate 221, each connecting hole 2212 corresponds to one of the clamping holes 212, and the connecting piece 23 is located in the connecting hole 2212 and the corresponding clamping hole 212.

In the above implementation manner, the sleeve 222 is disposed to facilitate the rotation shaft of the cylinder body 1 to pass through, so as to rotate relative to the sliding member 22, and the arrangement of the connection hole 2212 can correspond to the clamping hole 212, so that the connection member 23 is simultaneously inserted into the connection hole 2212 and the clamping hole 212, and the sliding member 22 is fixed on the fixing structure 21, so that the cylinder body 1 can be positioned after moving along with the sliding member 22.

In this embodiment, four connection holes 2212 are provided, and are respectively located at four corner positions of the slide 22. Correspondingly, there are four connecting elements 23.

Referring again to fig. 1 and 2, optionally, the fixed structure 21 includes a bracket 213 and a box 214. The case 214 is located in the holder 213, and the outer wall of the case 214 is connected to the inner wall of the holder 213.

Referring again to fig. 3, the glide 22 is located outside the housing 214 and is removably attached to an outer wall of the housing 214, and the bracket 213 is adapted to be attached to an external device.

In the above implementation, the bracket 213 is used to provide a support and mounting base for the case 214. Case 214 is used to provide a mounting base for glide 22. The sliding piece 22 is used for being connected with the oil cylinder body 1 so as to realize the rotation of the oil cylinder body 1.

Referring again to fig. 2 and 3, the case 214 includes a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall connected in series.

The first and third sidewalls of the tank 214 are oppositely disposed, the second and fourth sidewalls of the tank 214 are oppositely disposed, the first and third sidewalls of the tank 214 are respectively connected to the inner wall of the bracket 213, and the second sidewall of the tank 214 is used to be connected to an external pump station. The elongated hole 211 and the plurality of catching holes 212 are located on the fourth sidewall of the case 214.

In the above implementation, the tank 214 is configured as above, so that the tank 214 can provide a moving base for the sliding member 22 on the one hand, and can be connected with an external pump station on the other hand.

Fig. 4 is a schematic overall structure diagram of a cylinder body and a connection lug and the like provided in the embodiment of the present disclosure, and with reference to fig. 4, the cylinder body 1 includes a cylinder body 11 and a connection lug 12. The connecting ear ring 12 is coaxially sleeved on the outer wall of the cylinder 11, and two sides of the axis of the connecting ear ring 12 are respectively rotatably inserted into the sliding member 22.

In the above implementation, the connecting ear 12 is used to connect with the sliding member 22, so as to facilitate the rotation of the cylinder body 1.

Fig. 5 is a schematic structural view of a connection earring provided by the embodiment of the present disclosure, and in conjunction with fig. 5, the connection earring 12 optionally includes a connection ring 121, two trunnions 122, and two wear sleeves 123 (see fig. 2). The two trunnions 122 are coaxially arranged and are respectively connected to the outer wall of the connection ring 121, and the axes of the trunnions 122 extend in the radial direction of the connection ring 121.

Referring to fig. 2 again, the wear-resistant sleeves 123 correspond to the trunnions 122 one to one, the wear-resistant sleeves 123 are sleeved on the corresponding trunnions 122, and the outer walls of the wear-resistant sleeves 123 are rotatably connected with the sliding member 22. The connecting ring 121 is coaxially sleeved on the outer wall of the cylinder body 11.

In the above implementation manner, the connection ring 121 is used to connect the oil cylinder body 1 and the trunnion 122 together, the two trunnions 122 correspond to the two fixing structures 21 one by one, and the trunnion 122 is inserted into the corresponding sleeve 222, so that the trunnion 122 can rotate relative to the sliding part 22, that is, the oil cylinder body 1 can rotate relative to the sliding part 22, so that when in use, the oil cylinder body 1 can not only output linear motion, but also swing, and specific use requirements are met.

The wear-resistant sleeve 123 can reduce the friction between the sliding part 22 and the trunnion 122, and prolong the service life of the sliding part 22 and the trunnion 122.

With continued reference to fig. 2 and 5, the trunnion 122 is optionally provided with a plurality of spaced apart annular grooves 1222 axially along the trunnion. The inner wall of the wear-resistant sleeve 123 is provided with a plurality of annular protrusions 1231 arranged at intervals along the axial direction of the wear-resistant sleeve, the annular protrusions 1231 are arranged in one-to-one correspondence with the annular grooves 1222, and the annular protrusions 1231 are located in the corresponding annular grooves 1222.

In the above implementation, the annular groove 1222 and the annular protrusion 1231 are matched, so that the wear-resistant sleeve 123 is installed on the trunnion 122, and then the friction force between the sliding part 22 and the trunnion 122 is reduced through the wear-resistant sleeve 123, thereby prolonging the service life of the sliding part 22 and the trunnion 122.

Alternatively, each trunnion 122 has a communication hole 1221 along its own axis, one of the two communication holes 1221 communicating with the rodless chamber of the cylinder 11, and the other of the two communication holes 1221 communicating with the rod chamber of the cylinder 11.

Referring to fig. 1 again, the hydraulic cylinder further includes two joint assemblies 3, the two joint assemblies 3 correspond to the fixed structures 21 one by one, the first end of each joint assembly 3 is connected to the corresponding fixed structure 21 and communicated with the corresponding communication hole 1221, and the second end of each joint assembly 3 is used for being communicated with an external pump station.

In the above implementation manner, the joint assembly 3 is used for communicating an external pump station with the inside of the oil cylinder body 1 so as to supply oil to the inside of the oil cylinder body 1.

And the communicating hole 1221 is arranged in the trunnion 122, so that oil can be filled into the rodless cavity of the oil cylinder body 1 through the communicating hole 1221, and oil can be filled into the rod cavity of the oil cylinder body 1, thereby ensuring that the oil cylinder body 1 can be normally used.

Fig. 6 is a front view of the cylinder body provided in the embodiment of the present disclosure, and in conjunction with fig. 6, optionally, the cylinder body 1 further includes a first cylinder oil pipe 13 and a second cylinder oil pipe 14.

The first oil pipe 13 and the second oil pipe 14 are respectively located on two sides of the axis of the cylinder body 11 and connected with the cylinder body 11, the first end of the first oil pipe 13 is communicated with one of the two communication holes 1221, and the second end of the first oil pipe 13 is communicated with the rodless cavity of the cylinder body 11.

A first end of the second cylinder oil pipe 14 is communicated with the other of the two communication holes 1221, and a second end of the second cylinder oil pipe 14 is communicated with the rod chamber of the cylinder body 1.

In the above implementation manner, the first cylinder oil pipe 13 and the second cylinder oil pipe 14 are respectively used for being communicated with the two communication holes 1221, so as to input the power oil in the pump station into the rodless cavity or the rod cavity, and further drive the piston rod in the cylinder body 1 to extend or retract.

Fig. 7 is a sectional view taken along a-a direction of fig. 6, and in conjunction with fig. 7, the cylinder 11 optionally includes a first end cap 111, a second end cap 112, an intermediate cylinder 113, a piston 114, and a piston rod 115.

The first end cap 111 and the second end cap 112 respectively cover two ends of the middle cylinder 113, and are respectively connected with two ends of the middle cylinder 113. A first end of the piston rod 115 is inserted into the piston 114, and a second end of the piston rod 115 movably extends out of the second end cap 112. The piston 114 is located in the middle cylinder 113, and the outer peripheral wall of the piston 114 is attached to the inner wall of the middle cylinder 113, one side of the piston 114 forms a rodless cavity with the first end cap 111 and a part of the middle cylinder 113, and the other side of the piston 114 forms a rod cavity with the second end cap 112 and another part of the middle cylinder 113.

In the implementation manner, the internal structure of the oil cylinder body 1 can be simply implemented by the above structure, so that the oil cylinder body 1 can make the piston rod 115 perform reciprocating linear motion under the action of the power oil.

In this embodiment, the first end cover 111 has a first oil port 1111 in a radial direction thereof.

In the above implementation, the first oil port 1111 is configured to communicate with the second end of the first cylinder oil pipe 13 so as to communicate the first cylinder oil pipe 13 with the rodless chamber.

For the same reason, the second end cover 112 has a second oil port 1121 in the radial direction thereof.

In the above implementation, the second oil port 1121 is used to communicate with the first end of the second cylinder oil pipe 14 so as to communicate the rod chamber in the cylinder body 1 with the first cylinder oil pipe 13.

With continued reference to fig. 7, the cylinder body 1 further includes a displacement sensor 15, the displacement sensor 15 is connected to a surface of the first end cap 111 facing away from the second end cap 112, and the displacement sensor 15 is electrically connected to the piston rod 115 to monitor a moving stroke of the piston rod 115.

In the above embodiment, the displacement sensor 15 is used to monitor the moving stroke of the piston rod 115, so as to detect the moving stroke of the cylinder body 1.

Illustratively, the piston rod 115 has a first threading hole (not shown) along its axial direction. The middle part of the first end cover 111 is provided with a second threading hole which is coaxially arranged and communicated with the first threading hole.

In the above implementation manner, the signal line and the contact of the displacement sensor 15 are connected to the piston rod 115 through the first threading hole and the second threading hole, so that the movement stroke of the piston rod 115 is conveniently monitored, and the movement stroke of the cylinder body 1 is determined.

Optionally, the cylinder body 1 further comprises a connection joint 16, and the connection joint 16 is screwed on the second end of the piston rod 115.

The connecting joint 16 is used for connecting with an external moving structure to drive the external moving structure to perform a reciprocating linear motion by the movement of the piston rod 115.

Referring again to fig. 1, optionally, the joint assembly 3 includes a fixed joint 31 and a jointed tubing 32. A first end of the joint oil pipe 32 communicates with a first end of the fixed joint 31, a second end of the joint oil pipe 32 communicates with the corresponding communication hole 1221, and the joint oil pipe 32 is located inside the fixed structure 21.

The fixed connection 31 is connected to the fixed structure 21 and a second end of the fixed connection 31 communicates with an external pump station.

In the above implementation manner, the fixed joint 31 is used for communicating with an external pump station, and the joint oil pipe 32 is used for introducing external oil into the oil cylinder body 1.

Optionally, the joint tubing 32 is a hose.

In the above implementation manner, the joint oil pipe 32 is provided as a hose, so that the joint oil pipe 32 does not affect the rotation process of the cylinder body 1 using the trunnion 122 as the shaft, so that the cylinder body 1 can flexibly rotate.

In this embodiment, the joint oil pipe 32 is a rubber hose structure. The pump station is communicated with the fixed joint 31 through a stainless steel pipe, and oil is introduced into the oil cylinder body 1.

The fixed joint 31 is connected with one side of the fixed structure 21 facing the oil cylinder body 1 in a welding mode, an external oil pipe (an oil pipe communicated with a pump station) is connected with the fixed joint 31 in a welding mode, and the joint oil pipe 32 is inserted into the fixed joint 31 through a fastener.

The working process of the hydraulic oil cylinder provided by the embodiment of the disclosure is briefly described as follows:

first, the fixing structure 21 is fixed on the table, and the cylinder body 1 is supported on the table while being rotatably connected to the fixing structure 21.

Then, the joint component 3 is communicated with an external pump station, so that oil in the external pump station can be communicated with a rod cavity and a rodless cavity in the oil cylinder body 1.

Then, the sliding member 22 is moved so that the sliding member 22 and the cylinder body 1 can be moved together to adjust the position of the cylinder body 1, and the sliding member 22 is fixed to the fixing structure 21 by the connecting member 23 to position the cylinder body 1.

Next, the cylinder body 1 is swung, so that the cylinder body 1 can swing with the trunnion 122 as an axis, thereby ensuring that the cylinder body 1 can flexibly rotate.

Finally, the pump station is controlled, so that the piston rod 115 in the oil cylinder body 1 performs telescopic motion under the action of the power oil in the pump station, the oil cylinder body 1 can output linear motion, and meanwhile, the oil cylinder body 1 is controlled so that the oil cylinder body can rotate relative to the trunnion 122.

The hydraulic oil cylinder has the function of multi-degree-of-freedom adjustment, safety and reliability are both considered, functional adaptability of the hydraulic oil cylinder is greatly improved, cost can be saved, installation at various positions and adjustment of installation distance can be achieved by one hydraulic oil cylinder, and the hydraulic oil cylinder is widely applied to certain large-scale test platforms. That is to say, the hydraulic cylinder that this disclosed embodiment provided can the circumference swing also can lateral shifting, can adopt stainless steel pipe to carry out the oil feed oil return simultaneously, improves hydraulic cylinder's reliability.

The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims

1. The hydraulic oil cylinder is characterized by comprising an oil cylinder body (1) and two connecting assemblies (2);

the two connecting assemblies (2) are respectively positioned on two sides of the axis of the oil cylinder body (1), each connecting assembly (2) comprises a fixed structure (21), a sliding piece (22) and a connecting piece (23), each sliding piece (22) is movably connected with the fixed structure (21), and each connecting piece (23) is detachably connected with the fixed structure (21) and the corresponding sliding piece (22);

the two sides of the axis of the oil cylinder body (1) are respectively connected with the two sliding pieces (22) in a rotating mode, and a rotating surface formed by rotation of the oil cylinder body (1) is parallel to the moving direction of the sliding pieces (22).

2. The hydraulic cylinder according to claim 1, characterized in that a side wall of the fixing structure (21) facing the cylinder body (1) is provided with a long hole (211) and a plurality of clamping holes (212);

the length direction of the long hole (211) is the same as the moving direction of the sliding piece (22);

the clamping holes (212) are arranged at intervals along the length direction of the long holes (211);

the sliding piece (22) is movably located at the long hole (211) and is connected with the fixing structure (21) through the clamping hole (212).

3. Hydraulic cylinder according to claim 2, characterized in that said slide (22) comprises a base plate (221) and a sleeve (222);

the sleeve (222) is inserted in the middle of the base plate (221), and the sleeve (222) is positioned in the elongated hole (211);

the outer edge of the substrate (221) is provided with at least two connecting holes (2212), each connecting hole (2212) corresponds to one clamping hole (212), and the connecting piece (23) is located in the connecting hole (2212) and the corresponding clamping hole (212).

4. Hydraulic cylinder according to claim 1, characterized in that the cylinder body (1) comprises a cylinder body (11) and a connecting lug (12);

the connecting earrings (12) are coaxially sleeved on the outer wall of the cylinder body (11), and two sides of the axis of the connecting earrings (12) are respectively and rotatably inserted into the sliding pieces (22).

5. A hydraulic cylinder according to claim 4, characterized in that said connecting earrings (12) comprise a connecting ring (121), two trunnions (122) and two wear sleeves (123);

the two trunnions (122) are coaxially arranged and are respectively connected to the outer wall of the connecting ring (121), and the axes of the trunnions (122) extend along the radial direction of the connecting ring (121);

the wear-resistant sleeves (123) correspond to the trunnions (122) one by one, the wear-resistant sleeves (123) are sleeved on the corresponding trunnions (122), and the outer walls of the wear-resistant sleeves (123) are rotatably connected with the sliding pieces (22);

the connecting ring (121) is coaxially sleeved on the outer wall of the cylinder body (11).

6. A hydraulic cylinder according to claim 5, characterized in that the trunnion (122) is provided with a plurality of spaced apart annular grooves (1222) in its axial direction;

the inner wall of the wear-resistant sleeve (123) is provided with a plurality of annular protrusions (1231) arranged at intervals along the axial direction of the wear-resistant sleeve, the annular protrusions (1231) are arranged in one-to-one correspondence with the annular grooves (1222), and the annular protrusions (1231) are positioned in the corresponding annular grooves (1222).

7. A hydraulic cylinder according to claim 5, characterized in that each of said trunnions (122) has a communication hole (1221) along its own axis, one of the two communication holes (1221) communicating with the rodless chamber of the cylinder (11) and the other of the two communication holes (1221) communicating with the rodless chamber of the cylinder (11);

the hydraulic cylinder still includes two joint Assembly (3), two joint Assembly (3) with fixed knot constructs (21) one-to-one, and each the first end of joint Assembly (3) with correspond fixed knot constructs (21) and connects, and with the correspondence intercommunicating pore (1221) intercommunication, the second end of joint Assembly (3) is used for with external pump station intercommunication.

8. A hydraulic ram according to claim 7, characterised in that the joint assembly (3) comprises a fixed joint (31) and a joint oil tube (32);

the first end of the joint oil pipe (32) is communicated with the first end of the fixed joint (31), the second end of the joint oil pipe (32) is communicated with the corresponding communication hole (1221), and the joint oil pipe (32) is positioned inside the fixed structure (21);

the fixed joint (31) is connected with the fixed structure (21), and the second end of the fixed joint (31) is communicated with an external pump station.

9. A hydraulic ram according to claim 8, characterised in that the joint oil pipe (32) is a hose.

10. A hydraulic ram according to claim 7, characterised in that the ram body (1) further comprises a first ram oil pipe (13) and a second ram oil pipe (14);

the first oil cylinder oil pipe (13) and the second oil cylinder oil pipe (14) are respectively positioned at two sides of the axis of the cylinder body (11) and are connected with the connecting ring (121);

the first end of the first oil cylinder pipe (13) is communicated with one of the two communication holes (1221), and the second end of the first oil cylinder pipe (13) is communicated with the rodless cavity of the cylinder body (11);

the first end of the second oil cylinder pipe (14) is communicated with the other of the two communication holes (1221), and the second end of the second oil cylinder pipe (14) is communicated with the rod cavity of the oil cylinder body (1).