Oil cylinder structure capable of limiting rotation
By setting the guide rails and grooves in the hydraulic chamber, the complexity of hydraulic cylinder assembly is solved, and the stable rotation stop and sealing effect between the piston rod and the cylinder is achieved, thereby improving assembly efficiency and stability.
Patent Information
- Application Number
- CN202422555450.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-10-22
AI Technical Summary
During the assembly process of existing hydraulic cylinders, the relative rotation freedom between the piston rod and the cylinder is not restricted, resulting in increased assembly complexity and difficulty, especially in the case of obstruction of sight.
Axially extending guide rails and grooves are provided on the inner peripheral wall of the hydraulic chamber and the outer peripheral wall of the piston. Preliminary alignment is performed by observing the position of the guide rails and grooves, and the guide rails are fixed by connecting parts and screws to ensure the stop-rotation fit between the piston and the cylinder.
It reduces the complexity and difficulty of the assembly process, ensures that there is no relative rotation between the piston rod and the cylinder, improves the convenience and stability of assembly, and enhances the sealing performance and guidance effect.
Smart Images
Figure CN223282313U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydraulic oil cylinders, in particular to an oil cylinder structure with limited rotation. Background Art
[0002] A hydraulic cylinder is a hydraulic actuator that uses liquid pressure to drive a piston rod to extend and retract into a cylinder, performing linear reciprocating motion. Hydraulic cylinders convert hydraulic energy into mechanical energy and are used in a variety of applications, including construction machinery and machine tools. Commonly available hydraulic cylinders do not constrain the relative rotational freedom of the piston rod and cylinder barrel, making them less suitable for applications where relative rotation between the piston rod and cylinder barrel is crucial.
[0003] The related technology discloses a hydraulic cylinder, which includes a cylinder body, a piston rod and a piston. The cylinder body includes a cylinder barrel and a cylinder head connected to each other. The piston rod is connected to the piston. The piston is arranged in the cylinder barrel movably along the axial direction of the cylinder barrel. The piston moves to drive the piston rod to extend or retract into the cylinder barrel. An axially extending guide rod is provided on the piston, and a guide hole is provided on the cylinder head. When the piston moves, the guide rod is driven to move in the guide hole to limit the relative rotation between the piston and the cylinder head, so that the piston rod and the cylinder barrel do not rotate relative to each other during the hydraulic cylinder performs linear motion.
[0004] However, when assembling the hydraulic cylinder, it is necessary to first install the guide rod on the piston and push the piston into the cylinder toward the side where the cylinder head is located. During the assembly process, it is necessary to ensure that the guide rod on the piston can be accurately inserted into the guide hole on the cylinder head. Since the internal space of the cylinder is relatively closed, the assembler's line of sight may be blocked by the cylinder wall and the cylinder head, making it difficult to directly observe the alignment of the guide rod and the guide hole, thereby increasing the complexity and difficulty of assembly. Utility Model Content
[0005] The purpose of the utility model is to provide a limited rotation oil cylinder structure, and the technical problem it solves is: how to reduce the complexity and difficulty of assembly.
[0006] In order to solve the above technical problems, the present utility model adopts the following technical solutions.
[0007] The utility model provides a limited rotation oil cylinder structure, which comprises: a cylinder body, including a cylinder barrel and a cylinder cover, a hydraulic chamber is provided in the cylinder barrel, one end of the hydraulic chamber has an opening, the cylinder cover is detachably connected to the cylinder barrel and is used to close the opening, and a clearance opening is provided on the cylinder cover; a piston assembly, including a piston rod and a piston, the piston is sleeved outside the piston rod and connected to the piston rod, the piston rod is passed through the hydraulic chamber, and the free end of the piston rod is exposed outside the clearance opening, the piston is arranged in the hydraulic chamber so as to be movably along the axial direction of the hydraulic chamber, and the piston The cam is provided with an axially extending guide rail, and the cam is provided with a groove which cooperates with the guide rail. Alternatively, the cam is provided with an axially extending groove, and the cam is provided with a guide rail which cooperates with the groove. When the piston moves relative to the hydraulic chamber, the guide rail moves in the groove, and the guide rail and the groove form a rotation-stopping fit which prevents the piston and the piston rod from rotating relative to the cylinder barrel.
[0008] In some embodiments of the present application, at least two mounting holes are provided on the cylinder barrel and are distributed along the axial direction. The limited rotation cylinder structure also includes connecting parts with the same number as the mounting holes. The connecting parts include a cap and a rod that are connected to each other. The outer diameter of the cap is larger than the outer diameter of the rod. The cap is arranged outside the hydraulic cavity, and the outer diameter of the cap is larger than the inner diameter of the mounting hole. The rod passes through the mounting hole and is locked to the guide rail to fix the guide rail on the inner wall of the hydraulic cavity.
[0009] In some embodiments of the present application, the guide rail is provided with screw holes of the same number as the mounting holes, each screw hole corresponds one-to-one to each mounting hole, the screw hole has an internal thread, the rod has an external thread, and the rod is screwed to the screw hole to lock it to the guide rail.
[0010] In some embodiments of the present application, the cylinder barrel is provided with a joint arranged around the periphery of the mounting hole, the joint is provided outside the hydraulic chamber, the joint is provided with an interface, the number of the joints is the same as the mounting holes, and each of the joints corresponds one-to-one to each of the mounting holes, the limited rotation cylinder structure also includes the same number of plugs as the joints, each of the plugs corresponds one-to-one to each of the joints, the plugs are used to close the interface, and the cap is provided in the joint.
[0011] In some embodiments of the present application, the cylinder head includes a first cover portion and a second cover portion, both of which are annular, the outer diameter of the first cover portion is larger than the outer diameter of the second cover portion, the inner diameter of the first cover portion encloses a first give way channel, and the inner diameter of the second cover portion encloses a second give way channel, the first cover portion is connected to the second cover portion, and the first give way channel is connected to the second give way channel; the second cover portion is locked in the hydraulic chamber, the first cover portion is arranged in the hydraulic chamber, and is used to close the opening, and one end of the first give way channel is the give way port.
[0012] In some embodiments of the present application, the outer circumferential wall of the second cover portion is in the shape of a stepped ring with gradually decreasing size from one end connected to the first cover portion to the other end, and the inner circumferential wall of the hydraulic chamber is correspondingly in the shape of a stepped ring that cooperates with the second cover portion; the cylinder structure with limited rotation also includes a seal and a fastener, the seal is sleeved on the outside of the second cover portion, and forms a seal between the outer circumferential wall of the second cover portion and the inner circumferential wall of the hydraulic chamber, the fastener passes through the cylinder barrel and extends into the hydraulic chamber, and one end of the fastener is pressed against the outer circumferential wall of the second cover portion to lock the second cover portion in the hydraulic chamber.
[0013] In some embodiments of the present application, an oil hole is provided on the piston which passes through in the axial direction.
[0014] In some embodiments of the present application, there are at least two oil holes, and the oil holes are spaced apart along the circumference of the piston.
[0015] In some embodiments of the present application, the surface of the guide rail is chrome-plated.
[0016] In some embodiments of the present application, the piston is made of ductile iron.
[0017] It can be seen from the above technical solutions that the embodiments of the present utility model have at least the following advantages and positive effects:
[0018] In the limited rotation oil cylinder structure of the present invention, during assembly, the piston is pushed from the opening into the hydraulic chamber. Since the inner circumferential wall of the hydraulic chamber and the outer circumferential wall of the piston are respectively provided with guide rails and grooves extending in the axial direction, the position of the guide rails and grooves can be easily observed through the opening, and the influence of obstructed vision is relatively small, which facilitates the initial visual alignment of the two. Furthermore, since the piston can only be continuously pushed inward when it is aligned, the operator can also determine whether it is aligned based on the blockage during the pushing process. If the initial alignment is not in place, the operator can fine-tune the angle of the piston by rotating until the piston can be easily pushed in. When the piston is pushed in place, the assembly between the piston and the cylinder is completed. The overall assembly and adjustment process is relatively easy and simple, reducing the complexity and difficulty of the assembly process. Subsequently, the cylinder head and the cylinder are connected to the cylinder to close the hydraulic chamber. When the oil cylinder structure begins to work, the liquid pressure of the hydraulic oil injected into the hydraulic chamber can push the piston to move, thereby driving the piston rod connected to the piston to perform linear movement. When the piston moves relative to the hydraulic chamber, the guide rail moves in the groove. On the one hand, the concave-convex fit between the guide rail and the groove acts as a circumferential upper limit, which can prevent the piston from rotating relative to the cylinder, thereby indirectly preventing relative rotation between the piston rod and the cylinder. On the other hand, the sliding fit between the guide rail and the groove can guide the piston when it moves, making the piston more stable and accurate during movement. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The various objects, features, and advantages of the present invention will become more apparent upon consideration of the following detailed description of preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are merely illustrative illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, like reference numerals denote identical or similar components.
[0020] Figure 1 1 is a schematic structural diagram of a cylinder structure with limited rotation according to an exemplary embodiment.
[0021] Figure 2 yes Figure 1 Front cross-sectional view of .
[0022] Figure 3 yes Figure 1 side sectional view of .
[0023] Figure 4 yes Figure 1 Schematic diagram of the decomposition structure in .
[0024] Figure 5 yes Figure 1 Schematic diagram of the structure of the cylinder head and cylinder barrel.
[0025] Figure 6 yes Figure 1Schematic diagram of the cylinder head and seal structure.
[0026] Figure 7 yes Figure 2 Schematic diagram of the structure of the middle piston.
[0027] The following are the descriptions of the reference numerals:
[0028] 1. Cylinder body; 11. Cylinder barrel; 111. Hydraulic chamber; 112. Opening; 113. Guide rail; 1131. Screw hole; 114. Mounting hole; 115. Connector; 1151. Interface; 12. Cylinder head; 121. First cover; 122. Second cover; 123. First clearance channel; 124. Second clearance channel; 125. Clearance opening;
[0029] 2. Piston assembly; 21. Piston rod; 22. Piston; 221. Groove; 222. Oil hole;
[0030] 3. Connector; 31. Cap; 32. Rod;
[0031] 4. Plug;
[0032] 5. Seals;
[0033] 6. Fasteners. DETAILED DESCRIPTION
[0034] Although the present invention can be easily embodied as embodiments of different forms, only some of the specific embodiments are shown in the drawings and will be described in detail in this specification. It should be understood that this description should be regarded as an exemplary illustration of the principles of the present invention and is not intended to limit the present invention to that described herein.
[0035] Thus, a feature indicated in this specification is intended to illustrate one of the features of one embodiment of the present invention, rather than implying that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features can be combined together to illustrate possible system designs, these features can also be used in other, not explicitly described, combinations. Thus, unless otherwise noted, the described combinations are not intended to be limiting.
[0036] In the embodiments shown in the accompanying drawings, directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of various components of the present invention are not absolute but relative. These descriptions are applicable when these components are in the positions shown in the accompanying drawings. If the descriptions of the positions of these components are changed, these directional indications will also change accordingly.
[0037] See also Figures 1 to 3The oil cylinder structure with limited rotation provided by one embodiment of the present invention mainly includes a cylinder body 1 and a piston assembly 2. The cylinder body 1 includes a cylinder barrel 11 and a cylinder head 12. A hydraulic chamber 111 is provided in the cylinder barrel 11. One end of the hydraulic chamber 111 has an opening 112. The cylinder head 12 is detachably connected to the cylinder barrel 11 and is used to close the opening 112. A clearance opening 125 is provided on the cylinder head 12. The piston assembly 2 includes a piston rod 21 and a piston 22. The piston 22 is sleeved on the outside of the piston rod 21 and connected to the piston rod 21. The piston rod 21 is disposed in the hydraulic chamber 111, and the free end of the piston rod 21 is exposed outside the clearance opening 125. The piston 22 is disposed in the hydraulic chamber 111 so as to be movable along the axial direction of the hydraulic chamber. The movement of the piston 22 drives the piston rod 21 to move in the axial direction and causes the free end of the piston rod 21 to move closer to or away from the cylinder head 12. The inner circumferential wall of the hydraulic chamber 111 is provided with an axially extending guide rail 113, and the outer circumferential wall of the piston 22 is provided with a groove 221 that cooperates with the guide rail 113. Alternatively, the inner circumferential wall of the hydraulic chamber 111 is provided with an axially extending groove 221, and the outer circumferential wall of the piston 22 is provided with a guide rail 113 that cooperates with the groove 221. When the piston 22 moves relative to the hydraulic chamber 111, the guide rail 113 moves within the groove 221, and the guide rail 113 and the groove 221 form a rotation-stopping fit that prevents the piston 22 and the piston rod 21 from rotating relative to the cylinder 11.
[0038] In the oil cylinder structure with limited rotation in the embodiment of the present invention, during assembly, the piston 22 is pushed from the opening 112 into the hydraulic chamber 111. Since the inner circumferential wall of the hydraulic chamber 111 and the outer circumferential wall of the piston 22 are respectively provided with a guide rail 113 and a groove 221 extending in the axial direction, the position of the guide rail 113 and the groove 221 can be easily observed through the opening 112, and the influence of obstructed vision is relatively small, which facilitates the preliminary visual alignment of the two. Furthermore, since the piston 22 can be continuously pushed inward only when it is aligned in place, the operator can also judge whether it is aligned in place according to the blockage in the pushing process. When the preliminary alignment is not in place, the operator fine-tunes the angle of the piston 22 by rotating until the piston 22 can be easily pushed in. When the piston 22 is pushed in place, the assembly between the piston 22 and the cylinder 11 is completed. The overall process of assembly and adjustment is relatively easy and simple, which reduces the complexity and difficulty of the assembly process. Subsequently, the cylinder head 12 and the cylinder barrel 11 are connected, so that the hydraulic chamber 111 is in a closed state. When the cylinder structure begins to operate, the liquid pressure of the hydraulic oil injected into the hydraulic chamber 111 can push the piston 22 to move, thereby driving the piston rod 21 connected to the piston 22 to perform linear movement. As the piston 22 moves relative to the hydraulic chamber 111, the guide rail 113 moves within the groove 221. On the one hand, the concave-convex fit between the guide rail 113 and the groove 221 acts as a circumferential upper limit, which can prevent the piston 22 from rotating relative to the cylinder barrel 11, thereby indirectly preventing relative rotation between the piston rod 21 and the cylinder barrel 11. On the other hand, the sliding fit between the guide rail 113 and the groove 221 can guide the piston 22 as it moves, making the piston 22 more stable and accurate during movement.
[0039] See also Figure 2In one embodiment in which an axially extending guide rail 113 is provided on the inner circumferential wall of the hydraulic chamber 111, at least two axially spaced mounting holes 114 are formed on the cylinder barrel 11. The rotation-limiting cylinder structure further includes a connector 3, the same number as the mounting holes 114. The connector 3 includes a cap 31 and a rod 32, which are connected to each other. The outer diameter of the cap 31 is larger than the outer diameter of the rod 32. The cap 31 is disposed outside the hydraulic chamber 111 and has an outer diameter larger than the inner diameter of the mounting hole 114. The rod 32 passes through the mounting hole 114 and locks onto the guide rail 113, thereby securing the guide rail 113 to the inner circumferential wall of the hydraulic chamber 111. The cooperation between the mounting holes 114, the connector 3, and the guide rail 113 stably secures the guide rail 113 within the hydraulic chamber 111. Accordingly, the piston 22 is provided with a groove 221 that cooperates with the guide rail 113, thereby providing a specific and feasible arrangement for the guide rail 113 and the groove 221. On the other hand, if the guide rail 113 is worn, the connector 3 can be unlocked from the guide rail 113 and the guide rail 113 can be removed from the hydraulic chamber 111 for replacement without having to replace the entire cylinder 11, thereby saving costs. In other embodiments, the guide rail 113 is integrally connected to the inner circumferential wall of the hydraulic chamber 111.
[0040] It is conceivable that in one embodiment, an axially extending groove 221 is provided on the inner circumferential wall of the above-mentioned hydraulic chamber 111, and a guide rail 113 that cooperates with the groove 221 is provided on the outer circumferential wall of the piston 22, the piston 22 and the guide rail 113 can be integrally formed, or they can be integrally connected through the connection method disclosed in the prior art.
[0041] Exemplarily, there are three mounting holes 114 and three connectors 3, which are used to ensure that the guide rail 113 can be stably fixed in the hydraulic chamber 111, reduce shaking and offset, and thus improve the stability and reliability of the connection.
[0042] In a further embodiment, the three mounting holes 114 and the connecting member 3 may correspond to both ends and the middle of the guide rail 113 respectively.
[0043] In other embodiments, only one mounting hole 114 and one connecting member 3 are provided, and further, one mounting hole 114 and one connecting member 3 correspond to the middle of the guide rail 113, or two mounting holes 114 and two connecting members 3 are provided, and further, the two mounting holes 114 and the connecting members 3 correspond to the two ends of the guide rail 113 respectively. The above-mentioned other embodiments are implicitly disclosed by the embodiments of the present invention.
[0044] See also Figure 2 and Figure 3In a further embodiment, the guide rail 113 is provided with screw holes 1131 equal in number to the mounting holes 114, each screw hole 1131 corresponding to each mounting hole 114. The screw holes 1131 have internal threads, and the rod 32 has external threads. The rod 32 is screwed into the screw holes 1131 to be locked to the guide rail 113. The screw connection is simple, reliable, and easy to install and remove, thereby facilitating maintenance and replacement of the guide rail 113.
[0045] See also Figures 2 to 4 The cylinder barrel 11 is provided with a joint 115 arranged around the outer periphery of the mounting hole 114. The joint 115 is provided outside the hydraulic chamber 111 and has an interface 1151. The number of joints 115 is the same as the number of mounting holes 114, and each joint 115 corresponds to each mounting hole 114. The rotation-limited oil cylinder structure also includes the same number of plugs 4 as the number of joints 115, each plug 4 corresponds to each joint 115, and is used to close the interface 1151. The cap 31 is provided in the joint 115. The connector 3 enters the joint 115 through the interface 1151, and the rod 32 of the connector 3 passes through the mounting hole 114 and is locked to the guide rail 113. The cap 31 of the connector 3 is retained in the joint 115, which can prevent the connection from loosening or failure due to external force collision or accidental contact with the cap 31 of the connector 3, further improving the stability of the guide rail 113. The plug 4 closes the interface 1151 and provides an additional sealing measure, which can be used to additionally block the leakage of hydraulic oil from the gap between the connector 3 and the mounting hole 114, thereby improving the sealing performance of the entire cylinder structure.
[0046] See also Figure 5 In one embodiment in which the cylinder head 12 is detachably connected to the cylinder barrel 11, the cylinder head 12 includes a first cover portion 121 and a second cover portion 122, both of which are annular. The outer diameter of the first cover portion 121 is larger than the outer diameter of the second cover portion 122. The inner diameter of the first cover portion 121 encloses a first clearance passage 123, and the inner diameter of the second cover portion 122 encloses a second clearance passage 124. The first cover portion 121 and the second cover portion 122 are connected, and the first clearance passage 123 communicates with the second clearance passage 124. The second cover portion 122 is locked within the hydraulic chamber 111. The first cover portion 121 is disposed within the hydraulic chamber 111 and is used to close the opening 112. One end of the first clearance passage 123 is a clearance opening 125. Through the specific cooperation between the first cover part 121, the second cover part 122 and the cylinder barrel 11, on the one hand, it is ensured that the opening 112 can be effectively blocked when the cylinder barrel 11 is connected, so that the cylinder structure has a structural basis for subsequent execution of work; on the other hand, the first make way channel 123 and the second make way channel 124 are connected to form a channel for the piston rod 21 to move, ensuring that the piston rod 21 can move relative to the hydraulic chamber 111 when the piston 22 is driven by liquid pressure.
[0047] See also Figure 5 and Figure 6 In a further embodiment, the outer circumferential wall of the second cover portion 122 is in a stepped annular shape with gradually decreasing size from one end connected to the first cover portion 121 to the other end, and the inner circumferential wall of the hydraulic chamber 111 is correspondingly in a stepped annular shape that cooperates with the second cover portion 122. The limited rotation cylinder structure also includes a seal 5 and a fastener 6. The seal 5 is sleeved on the outside of the second cover portion 122 and forms a seal between the outer circumferential wall of the second cover portion 122 and the inner circumferential wall of the hydraulic chamber 111. The fastener 6 extends through the cylinder barrel 11 into the hydraulic chamber 111, and one end of the fastener 6 presses against the outer circumferential wall of the second cover portion 122 to lock the second cover portion 122 in the hydraulic chamber 111. The stepped annular cooperation between the second cover portion 122 and the hydraulic chamber 111, as well as the provision of the seal 5, can significantly improve the sealing performance of the cylinder structure, effectively prevent the leakage of hydraulic oil, and thus extend the service life of the cylinder structure. The fastener 6 securely fastens the second cover 122 within the hydraulic chamber 111, preventing it from shaking or shifting, thereby improving the stability and reliability of the overall cylinder structure. The form fit between the second cover 122 and the hydraulic chamber 111 and the securing method facilitate assembly and disassembly between the cylinder barrel 11 and the cylinder head 12, thereby reducing maintenance costs and time. In this embodiment, the seal 5 is an O-ring.
[0048] In a further embodiment, a sealing member 5 is also provided on the junction of the first cover portion 121 and the second cover portion 122 , thereby further improving the sealing performance of the oil cylinder structure.
[0049] See also Figure 3 、 Figure 4 and Figure 7 The piston 22 is provided with an oil hole 222 that passes through in the axial direction. The piston 22 divides the hydraulic chamber 111 into a rod chamber and a rodless chamber. The space between the rod chamber and the rodless chamber changes relatively with the movement of the piston 22. The oil hole 222 is used to connect the rod chamber and the rodless chamber, allowing hydraulic oil to flow between the rod chamber and the rodless chamber, thereby achieving the effect of balancing the pressure between the rodless chamber and the rod chamber, performing movement buffering and adjusting the reciprocating motion speed of the piston 22, making the overall movement of the cylinder structure more stable.
[0050] In a further embodiment, at least two oil holes 222 are provided, each of which is spaced apart along the circumference of the piston 22. Providing two or more oil holes 222 helps improve the flow efficiency of the hydraulic oil, and evenly distributed oil holes 222 can ensure a more uniform force on the piston 22. In this embodiment, four oil holes 222 are provided.
[0051] In the above embodiments, the surface of the guide rail 113 is chrome-plated, which can improve the hardness and wear resistance of the guide rail 113, extend the service life of the guide rail 113, and improve the stability and reliability of the cylinder structure.
[0052] In the above embodiments, the piston 22 is made of ductile iron, which has certain lubricating properties and can reduce friction and wear during the movement of the piston 22, making the movement of the piston 22 smoother and improving the accuracy of the movement of the piston 22.
[0053] While the present invention has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope of the appended claims. Therefore, all changes and modifications that fall within the scope of the claims or their equivalents are intended to be covered by the appended claims.
Claims
1. A cylinder structure with limited rotation, characterized in that: include: The cylinder body comprises a cylinder barrel and a cylinder cover, wherein a hydraulic chamber is provided in the cylinder barrel and one end of the hydraulic chamber has an opening, the cylinder cover is detachably connected to the cylinder barrel and is used to close the opening, and a clearance opening is provided on the cylinder cover; A piston assembly, comprising a piston rod and a piston, wherein the piston is sleeved outside the piston rod and connected to the piston rod, the piston rod is disposed in the hydraulic chamber, and the free end of the piston rod is exposed outside the clearance port, the piston is disposed in the hydraulic chamber so as to be movable along the axial direction of the hydraulic chamber, and the movement of the piston drives the piston rod to move in the axial direction and causes the free end of the piston rod to approach or move away from the cylinder head; Wherein, an axially extending guide rail is provided on the inner circumferential wall of the hydraulic chamber, and a groove cooperating with the guide rail is provided on the outer circumferential wall of the piston, or an axially extending groove is provided on the inner circumferential wall of the hydraulic chamber, and a guide rail cooperating with the groove is provided on the outer circumferential wall of the piston; When the piston moves relative to the hydraulic chamber, the guide rail moves in the groove, and the guide rail and the groove form a rotation-stopping fit that prevents the piston and the piston rod from rotating relative to the cylinder.
2. The oil cylinder structure with limited rotation according to claim 1, characterized in that: The cylinder barrel is provided with at least two mounting holes spaced apart along the axial direction. The rotation-limiting cylinder structure also includes connecting parts having the same number as the mounting holes. The connecting parts include a cap and a rod connected to each other. The outer diameter of the cap is larger than the outer diameter of the rod. The cap is arranged outside the hydraulic chamber, and the outer diameter of the cap is larger than the inner diameter of the mounting hole. The rod passes through the mounting hole and is locked to the guide rail to fix the guide rail on the inner circumferential wall of the hydraulic chamber.
3. The oil cylinder structure with limited rotation according to claim 2, characterized in that: The guide rail is provided with screw holes having the same number as the mounting holes, each screw hole corresponds to each mounting hole one by one, the screw holes have internal threads, the rod has external threads, and the rod is screwed to the screw holes to be locked to the guide rail.
4. The oil cylinder structure with limited rotation according to claim 2, characterized in that: The cylinder is provided with a joint arranged around the outer circumference of the mounting hole, the joint is provided outside the hydraulic chamber, the joint is provided with an interface, the number of the joints is the same as the mounting holes, and each of the joints corresponds one-to-one to each of the mounting holes. The limited rotation cylinder structure also includes plugs with the same number as the joints, and each of the plugs corresponds one-to-one to each of the joints. The plugs are used to close the interface, and the cap is provided in the joint.
5. The oil cylinder structure with limited rotation according to claim 1, characterized in that: The cylinder head includes a first cover portion and a second cover portion, both of which are annular. The outer diameter of the first cover portion is larger than the outer diameter of the second cover portion. The inner diameter of the first cover portion encloses a first clearance channel, and the inner diameter of the second cover portion encloses a second clearance channel. The first cover portion is connected to the second cover portion, and the first clearance channel is connected to the second clearance channel. The second cover portion is locked in the hydraulic cavity, the first cover portion is arranged in the hydraulic cavity and is used to close the opening, and one end of the first make way channel is the make way opening.
6. The oil cylinder structure with limited rotation according to claim 5, characterized in that: The outer circumferential wall of the second cover portion is in the shape of a stepped ring with gradually decreasing size from one end connected to the first cover portion to the other end, and the inner circumferential wall of the hydraulic chamber is correspondingly in the shape of a stepped ring that cooperates with the second cover portion; the cylinder structure with limited rotation also includes a seal and a fastener, the seal is sleeved on the outside of the second cover portion, and forms a seal between the outer circumferential wall of the second cover portion and the inner circumferential wall of the hydraulic chamber, the fastener passes through the cylinder barrel and extends into the hydraulic chamber, and one end of the fastener is pressed against the outer circumferential wall of the second cover portion to lock the second cover portion in the hydraulic chamber.
7. The oil cylinder structure with limited rotation according to claim 1, characterized in that: The piston is provided with an oil hole which penetrates in the axial direction.
8. The oil cylinder structure with limited rotation according to claim 7, characterized in that: There are at least two oil holes, and the oil holes are spaced apart along the circumference of the piston.
9. The oil cylinder structure with limited rotation according to claim 1, characterized in that: The surface of the guide rail is chrome-plated.
10. The oil cylinder structure with limited rotation according to claim 1, characterized in that: The piston is made of ductile iron.