Built-in anti-rotation oil cylinder

Abstract

The utility model relates to a built-in anti-rotation oil cylinder which comprises a cylinder barrel, a piston, a piston rod and an anti-rotation rod. A cavity is formed in the cylinder barrel, the cylinder barrel and the cylinder bottom are welded to form a closed cavity, an L-shaped oil inlet hole is formed in the cylinder bottom, and an oil through hole is formed in the cylinder barrel. The piston is connected with the piston rod, the cavity is divided into a rod cavity and a rodless cavity, and an eccentric through hole with a sealing groove is formed in the piston. And one end of the piston rod is matched with the guide sleeve, and the other end of the piston rod is matched with the piston. The anti-rotation rod is arranged in inner holes of the piston rod and the cylinder bottom, a guide section is arranged on the outer circle, penetrates through an inner hole of the copper sleeve, limits circumferential rotation of the piston and is fixed through a set screw, a cylindrical pin and a plug, and structural stability is enhanced. Through the design of the built-in anti-rotation rod, the piston rod is effectively prevented from rotating, the movement precision and stability are ensured, the internal structure is optimized, the occupied space is reduced, the sealing performance is improved, and the service life is prolonged. The compact structural design is suitable for installation in a narrow space, and the maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of mechanical hydraulic technology, and more specifically, to a built-in anti-rotation cylinder. Background Technology

[0002] Traditional hydraulic cylinders suffer from piston rod rotation during operation. In hydraulic systems, the cylinder is a crucial actuator, converting hydraulic energy into mechanical energy to achieve linear or oscillating reciprocating motion. However, due to uneven circumferential fit between the piston rod and the cylinder barrel, the piston rod is prone to rotation during extension and retraction, which affects the accuracy and stability of the equipment.

[0003] To address this problem, anti-rotation cylinders were developed. Their core design involves optimizing the internal structure to limit piston rod rotation. Common technical solutions include: designing an eccentric structure between the piston rod and piston to prevent the piston rod from rotating relative to the cylinder; adding an anti-rotation guide rod or anti-rotation nut to limit piston rod rotation using a non-circular structure (such as a square one); and installing an anti-rotation block at the end of the piston rod, which, through cooperation with a fixed structure within the cylinder, prevents piston rod rotation.

[0004] In existing construction machinery, the anti-rotation device of the anti-rotation cylinder is generally set on the outside of the cylinder. This is inconvenient to install in narrow spaces, and it also encroaches on the installation space of other components. The exposed anti-rotation rod is prone to corrosion, collision and bending, which affects the service life of the cylinder.

[0005] Authorized publication number CN221569063U discloses an anti-rotation hydraulic cylinder, comprising: a mounting base having a spherical cavity; a cylinder body, one end of which is a mounting end, which is spherical and located within the spherical cavity for hinge connection with the mounting base; an anti-rotation block fixed to the mounting base, having a limiting groove; and an anti-rotation head fixed to the cylinder body, which engages with the limiting groove to limit the circumferential movement of the cylinder body. In this design, the spherical hinge connection between the cylinder body and the mounting base allows the cylinder body to swing within a certain range relative to the mounting base, meeting usage requirements. Furthermore, the engagement of the anti-rotation head and the anti-rotation block restricts the circumferential position of the cylinder body, preventing rotation of the cylinder body relative to the mounting base and thus avoiding reduced lifespan due to cylinder rotation.

[0006] However, the patent still has the following problems: the mounting base is located externally, taking up space; although the problem of the cylinder rotating relative to the mounting base has been optimized, various problems still occur with the anti-rotation rod. Utility Model Content

[0007] To address the issues of exposed anti-rotation rods being prone to corrosion, bending, and other problems, this invention integrates the anti-rotation rod inside the hydraulic cylinder. Furthermore, to address the issue of the anti-rotation cylinder occupying a large area, the anti-rotation rod is integrated with the internal piston rod, ensuring a tight seal while resolving the problem of insufficient structural compactness and inconvenient installation in confined spaces.

[0008] An internal anti-rotation hydraulic cylinder includes a cylinder barrel and a piston. The cylinder barrel has a chamber and an oil passage hole communicating with the chamber. A guide sleeve is threadedly connected to the cylinder barrel and locked in place, forming a sealed chamber with a sealing assembly. The piston is connected to a piston rod and moves within the chamber to divide it into two parts: a rod-side chamber on the left and a rodless chamber on the right. The piston has an eccentric through hole with a sealing groove.

[0009] Preferably, the cylinder barrel and the cylinder bottom are welded together to form a sealed chamber, the guide sleeve is screwed into the cylinder barrel and locked, the piston is screwed into the piston rod and locked, and moves in the cylinder barrel along the axis and radial direction.

[0010] Preferably, the piston rod has a rod head pin hole on the outside and an inner hole on the inside. One end of the piston rod is connected to the cylinder by cooperating with the guide sleeve, and the other end is connected to the cylinder by cooperating with the piston.

[0011] Preferably, the cylinder barrel and cylinder bottom are welded together to form a sealed chamber. An L-shaped oil inlet is provided on the cylinder bottom, and an inner hole is provided on one side of the cylinder bottom that corresponds to the inner hole of the piston rod. This improves sealing performance, optimizes the oil flow path, enhances structural strength, simplifies maintenance, and improves the performance and service life of the hydraulic cylinder.

[0012] Preferably, anti-rotation rods are provided in the inner bore of the piston rod and the inner bore of the cylinder bottom. This effectively prevents the piston rod from rotating, ensuring motion accuracy and stability, while optimizing structural compactness and enhancing service life and reliability.

[0013] Preferably, the outer circumference of the anti-rotation rod is provided with a guide section that passes through the inner hole of the copper sleeve and the inner hole of the piston rod, restricting the circumferential rotation of the piston. This can precisely restrict the circumferential rotation of the piston, effectively prevent the piston rod from rotating on its own, thereby improving the motion accuracy and stability of the hydraulic cylinder, ensuring the reliability of equipment operation, while optimizing the internal structure, reducing space occupation, and enhancing overall performance.

[0014] Preferably, the anti-rotation rod is fixed to the bottom of the cylinder by a set screw, the inner hole of the copper sleeve is provided with a guide groove to cooperate with the piston rod, and the end face is drilled with a slit hole and locked with a screw to fix the anti-rotation rod.

[0015] Preferably, a cylindrical pin and a plug are provided on the outer side of the set screw. This enhances structural stability, prevents loosening due to vibration, and also provides sealing and protection, extending the service life of the component.

[0016] The beneficial effects of this utility model are: preventing the circumferential rotation of the piston rod and piston. Through the cooperation of the built-in anti-rotation rod and copper sleeve, the circumferential rotation of the piston and piston rod is effectively limited, ensuring that the position of the rod head pin hole is always fixed, and avoiding equipment precision reduction and malfunction caused by piston rod rotation.

[0017] With its compact structure and space-saving design, the anti-rotation rod is located inside the cylinder barrel, making the overall structure compact and suitable for installation in narrow spaces, thus improving the applicability of the hydraulic cylinder.

[0018] To improve service life, the anti-rotation rod is located inside the hydraulic cylinder, reducing its contact with the external environment and preventing damage caused by external factors such as rust and collision, thereby extending the service life of the hydraulic cylinder.

[0019] Improving sealing performance, the cylinder barrel is welded to the cylinder bottom, and the sealing groove design of the sealing components and anti-rotation rod ensures the sealing of the inside of the cylinder, reduces the risk of hydraulic oil leakage, and improves the reliability of the system.

[0020] Easy to install and maintain, the anti-rotation rod is fixed by set screws and cylindrical pins, with a simple structure that is easy to install and maintain, reducing the cost of use.

[0021] It is adaptable to a variety of application scenarios and is suitable for hydraulic systems that require high-precision positioning and stability, such as construction machinery, automated equipment, and tunnel boring machines, and can meet the needs of different working conditions. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of a built-in anti-rotation hydraulic cylinder according to an embodiment of the present invention.

[0023] Figure 2 This is an enlarged view of some parts of a built-in anti-rotation hydraulic cylinder according to an embodiment of the present invention.

[0024] In the diagram: Piston rod 1, rod head pin hole 11, guide sleeve 2, oil passage hole 3, anti-rotation rod 4, plug 41, cylindrical pin 42, set screw 43, guide section 44, cylinder 5, piston 6, copper sleeve 7, guide groove 71, cylinder bottom 8, oil inlet hole 81. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] As shown in the figure, a built-in anti-rotation hydraulic cylinder includes a cylinder barrel 5 and a piston 6. The cylinder barrel 5 has a working chamber and an oil passage communicating with the chamber. A guide sleeve 2 is threadedly connected to and locked to the cylinder barrel 5, forming a sealed space in conjunction with a sealing element. The piston 6 is connected to the piston rod 1, dividing the chamber into a rod-side chamber and a rodless chamber. The piston 6 has an eccentric through-hole with a sealing groove. The cylinder barrel 5 and the cylinder bottom 8 are welded together to form a sealed chamber. The cylinder bottom 8 is equipped with an L-shaped oil inlet channel, the inner hole of which corresponds to the inner hole of the piston rod 1. This design significantly improves sealing performance, optimizes the oil flow path, enhances overall structural strength, simplifies maintenance, and extends the service life of the hydraulic cylinder. An anti-rotation rod 4 is installed in the inner hole of the piston rod 1, with a guide structure on its outer circumference, passing through the inner hole of the copper sleeve 7, effectively limiting the rotation of the piston 6, thereby improving the movement accuracy and stability of the hydraulic cylinder. The anti-rotation rod 4 is fixed to the cylinder bottom 8 by the set screw 43. The guide groove 71 in the inner hole of the copper sleeve 7 fits tightly with the piston rod 1, and the end face is locked with screws through the slotted hole, further enhancing the stability and reliability of the structure. In addition, the set screw 43 is equipped with a cylindrical pin 42 and a plug 41 on the outside to prevent loosening due to vibration, while also providing sealing and protection, and extending the service life of the components.

[0027] An internal anti-rotation cylinder includes a cylinder barrel 5 and a piston 6. The cylinder barrel 5 has a chamber and an oil passage hole 3 communicating with the chamber. The guide sleeve 2 is threadedly connected and locked to the cylinder barrel 5, and together with the sealing assembly, a sealed chamber is formed.

[0028] Piston 6 is connected to piston rod 1. Piston 6 moves within the chamber to divide the chamber into two parts: a rod chamber on the left and a rodless chamber on the right. Piston 6 is provided with an eccentric through hole with a sealing groove.

[0029] The eccentric through-hole can cooperate with the anti-rotation rod 4 to effectively limit the circumferential rotation of the piston rod 1, thereby ensuring that the piston rod 1 will not rotate during extension and retraction. This is crucial for applications requiring high-precision positioning, such as tunnel boring machines, construction machinery, and automated production lines, significantly improving the stability and reliability of the equipment. Secondly, the sealing groove design effectively prevents hydraulic oil leakage and enhances the sealing performance of the cylinder. This design improves the overall efficiency and service life of the system by reducing the risk of leakage.

[0030] Furthermore, the eccentric through-hole design integrates the anti-rotation function within the piston 6, eliminating the need for an additional external anti-rotation device, thus saving space and making the cylinder structure more compact. This compact design is particularly suitable for installation in space-constrained equipment. Simultaneously, the combination of the built-in anti-rotation rod 4 and the eccentric through-hole reduces friction between the piston rod 1 and the cylinder 5, lowering wear caused by rotation. This design not only extends the service life of the cylinder but also reduces costs associated with frequent seal replacements or equipment maintenance.

[0031] The eccentric through-hole design with sealing groove has significant advantages in anti-rotation hydraulic cylinders. It can effectively solve the problem of self-rotation of the piston rod 1 in traditional hydraulic cylinders, while improving sealing performance and service life. It can adapt to a variety of complex working conditions, and performs particularly well in high-load and high-precision positioning applications.

[0032] In the design of the built-in anti-rotation cylinder, the cylinder barrel 5 and the cylinder bottom 8 are welded together to form a sealed chamber. The guide sleeve 2 is screwed into the cylinder barrel 5 and locked, and the piston 6 is screwed into the piston rod 1 and locked. The entire assembly moves along the axis and radially within the cylinder barrel 5. Firstly, the welded connection between the cylinder barrel 5 and the cylinder bottom 8 ensures the sealing of the cylinder interior, effectively preventing hydraulic oil leakage and improving the reliability and safety of the system. This sealed design not only reduces hydraulic oil waste caused by leakage but also avoids the risk of environmental pollution due to oil leakage.

[0033] Secondly, the screw-in connection and locking between the guide sleeve 2 and the cylinder 5 ensures precise guidance of the piston rod 1 during movement, reducing wear and malfunctions caused by misalignment or vibration. This design improves the movement accuracy and stability of the hydraulic cylinder and extends its service life.

[0034] Furthermore, the screw-in connection and locking between piston 6 and piston rod 1 allows piston 6 and piston rod 1 to move as a whole along the axis and radially within cylinder 5. This integrated design not only improves the smoothness and precision of the movement but also enhances the overall structural strength of the cylinder, enabling it to withstand higher loads and pressures.

[0035] This structural design significantly improves the performance and service life of the hydraulic cylinder by ensuring sealing, enhancing motion precision and stability, and increasing overall strength.

[0036] In the design of the built-in anti-rotation cylinder, the piston rod 1 has an external rod head pin hole 11 and an internal bore. One end of the rod head pin hole 11 connects to the cylinder 5 in conjunction with the guide sleeve 2, and the other end is tightly connected to the piston 6. Firstly, the rod head pin hole 11 facilitates external mechanical connections, enabling precise fixing to other equipment via pins or other connectors, thus ensuring effective power transmission and stable equipment operation. Simultaneously, the internal bore of the piston rod 1 provides a channel for the anti-rotation rod 4 or other internal components, further optimizing the internal structure of the cylinder. This allows it to achieve the anti-rotation function while reducing the external space occupied and improving overall compactness.

[0037] Furthermore, the fit between piston rod 1 and guide sleeve 2 ensures precise guidance within cylinder 5, effectively reducing skewing and vibration during movement, thereby improving the cylinder's motion accuracy and stability. The tight connection at the other end to piston 6 ensures synchronous movement between piston rod 1 and piston 6, avoiding efficiency losses or malfunction risks due to loose connections, and enhancing the overall performance and reliability of the cylinder. This design not only improves the cylinder's structural strength, enabling it to withstand higher loads and pressures, but also extends its service life by reducing internal friction.

[0038] This piston rod 1 design significantly improves the performance and service life of the hydraulic cylinder through multi-functional connection, precise guidance and enhanced structural strength, while optimizing space utilization.

[0039] The cylinder barrel 5 and cylinder bottom 8 are welded together to form a sealed chamber. An L-shaped oil inlet 81 is provided on the cylinder bottom 8, and the inner hole on one side of the cylinder bottom 8 is aligned with the inner hole of the piston rod 1. Firstly, the welded connection effectively prevents hydraulic oil leakage, ensuring the sealing of the cylinder interior, thereby improving the reliability and safety of the system and reducing the risk of hydraulic oil waste and equipment failure due to leakage. Secondly, the design of the L-shaped oil inlet 81 optimizes the flow path of the hydraulic oil, allowing the oil to enter the cylinder barrel 5 more evenly. Simultaneously, the relative fit between the inner hole of the cylinder bottom 8 and the inner hole of the piston rod 1 further enhances the lubrication effect, reduces wear caused by poor oil flow, and extends the service life of the cylinder.

[0040] Furthermore, welded structures offer higher strength and stability compared to other connection methods (such as threaded or flanged connections), better adapting to high loads and complex operating conditions, and reducing connection loosening caused by vibration or high-pressure environments. This design also simplifies the overall structure of the cylinder, reducing the number of parts and making the cylinder more compact, facilitating installation and maintenance. Simultaneously, the compact design makes it more suitable for installation in space-constrained equipment. This design significantly improves the performance and service life of hydraulic cylinders by enhancing sealing, optimizing oil flow, strengthening structural strength, and simplifying maintenance.

[0041] An anti-rotation rod 4 is installed in the inner bore of the piston rod 1 and the inner bore of the cylinder bottom 8. This design effectively prevents the piston rod 1 from rotating during reciprocating motion, thereby ensuring the motion accuracy and stability of the hydraulic cylinder. The anti-rotation rod 4, through its engagement with the inner bore of the piston rod 1, provides additional guidance and axial fixation, preventing equipment malfunctions and sensor failures caused by piston rod 1 rotation. Furthermore, this built-in anti-rotation rod 4 design reduces the need for external anti-rotation devices, lowers space requirements, and results in a more compact structure, making it suitable for installation in confined spaces. Simultaneously, the internal arrangement of the anti-rotation rod 4 reduces the impact of the external environment, improving the service life and reliability of the hydraulic cylinder.

[0042] The anti-rotation rod 4 has a guide section 44 on its outer circle that passes through the copper sleeve 7 and the inner hole of the piston rod 1. This can precisely limit the circumferential rotation of the piston and effectively prevent the piston rod 1 from rotating on its own, thereby improving the motion accuracy and stability of the hydraulic cylinder, ensuring the reliability of the equipment operation, while optimizing the internal structure, reducing space occupation, and enhancing overall performance.

[0043] The anti-rotation rod 4 is fixed to the cylinder bottom 8 by a set screw 43. Simultaneously, the inner bore of the copper sleeve 7 has a guide groove 71 that tightly engages with the piston rod 1, and the end face is locked with a screw through a slotted hole. This design ensures the stability and reliability of the anti-rotation rod 4 within the cylinder 5, effectively limiting the circumferential rotation of the piston rod 1, thereby improving the cylinder's motion accuracy and stability. The set screw 43 ensures the anti-rotation rod 4 remains secure under high loads and complex operating conditions, preventing loosening due to vibration or impact. The guide groove 71 in the inner bore of the copper sleeve 7 further optimizes the piston rod 1's movement trajectory, reducing friction and wear, and extending the cylinder's service life. Furthermore, the slotted screw locking method enhances the overall structural strength and stability, making the cylinder more reliable during operation and reducing maintenance costs and failure risks.

[0044] A cylindrical pin 42 and a plug 41 are provided on the outside of the set screw 43, which effectively enhances the stability and reliability of the structure. The set screw 43 is used to fix the anti-rotation rod 4, ensuring that it does not loosen under high loads and complex working conditions. The cylindrical pin 42 further provides additional positioning and anti-loosening functions, preventing the set screw 43 from shifting due to vibration. The plug 41 is used to seal and protect the exposed parts of the screw and pin, preventing dust and impurities from entering and extending the service life of the components. This combined design not only improves the anti-loosening performance of the hydraulic cylinder, but also enhances the overall durability and ease of maintenance.

[0045] Specifically, the cylinder 5 has a chamber within it, and the cylinder 5 has an oil passage 3 communicating with the chamber; the cylinder bottom 8 has an oil inlet 81 communicating with the chamber, and also has a fixing hole; the piston 6 can move within the chamber to divide it into a rod chamber and a rodless chamber; the piston rod 1 is connected to the piston 6, with a rod pin hole 11 at the exposed end and an inner hole inside; the copper sleeve 7 has a guide groove 71 in its inner hole, which cooperates with the piston 6, and the end face has a slotted hole and is locked with a screw; the guide sleeve 2 is threadedly connected to the cylinder 5 and locked, and together with the sealing assembly, forms a sealed chamber; the anti-rotation rod 4 has a guide section 44 on its outer circle, which passes through the inner hole of the copper sleeve 7 and the inner hole of the piston rod 1, restricting the circumferential rotation of the piston 6;

[0046] Therefore, according to an embodiment of the present invention, a built-in anti-rotation cylinder has a fixing hole on the cylinder bottom 8, a guide groove 71 in the inner hole of the copper sleeve 7, which cooperates with the piston 6, and a slit hole is drilled on the end face and locked with screws. The anti-rotation rod 4 is first fixed to the fixed cylinder bottom 8 with a set screw 43, and then passes through the fixed copper sleeve 7. The cylinder bottom 8 is welded and fixed to the cylinder barrel 5. The guide sleeve 2 is threaded and locked to the cylinder barrel 5. The anti-rotation rod 4 is constrained and fixed. Therefore, when the piston rod 1 slides on the anti-rotation rod 4, it will not rotate circumferentially, and the piston 6 connected to the piston rod 1 will not rotate circumferentially. Thus, the position of the rod head pin hole 11 is always fixed and does not rotate circumferentially, thereby realizing the anti-rotation function.

[0047] In summary, the eccentric rod anti-rotation hydraulic cylinder according to this utility model embodiment, through the built-in anti-rotation rod 4, in conjunction with the fixing hole fixed in the cylinder bottom 8 and the fixed copper sleeve 7, restricts the rotation of the piston rod 1 connected to the copper sleeve 7, thus determining the position of the rod head pin hole 11. The anti-rotation rod 4 is arranged inside the cavity of the cylinder 5, and the overall structure is simple and compact, further saving space and making it suitable for installation in narrow spaces. At the same time, the built-in anti-rotation rod 4 has less contact with air, making it less prone to corrosion or collision bending, and extending the service life of the hydraulic cylinder.

[0048] This utility model designs a built-in anti-rotation hydraulic cylinder, including a cylinder barrel, which defines a chamber and has an oil passage 3 communicating with the chamber; a cylinder bottom 8, which has an oil inlet 81 communicating with the chamber and a fixing hole; a piston, which can move within the chamber to divide it into a rod chamber and a rodless chamber; a piston rod 1, which is connected to the piston and has a rod pin hole 11 at its exposed end and an inner hole inside; a copper sleeve 7, which has a guide groove 71 in its inner hole and cooperates with the piston, with a slotted hole on its end face and locked with a screw; a guide sleeve 2, which is threaded and locked to the cylinder barrel 5, and cooperates with a sealing assembly to form a sealed chamber; and an anti-rotation rod 4, which has a guide section 44 on its outer circle, which passes through the inner hole of the copper sleeve 7 and the inner hole of the piston rod 1 to restrict the circumferential rotation of the piston. The anti-rotation rod 4 is first fixed to the fixed cylinder bottom 8 with a stud screw, and then passes through the fixed copper sleeve 7. It can constrain the rotation of the piston and piston rod 1, thereby limiting the rotation of the rod head pin hole 11, stabilizing the pin hole position, and meeting the main unit's limit use requirements. Moreover, the anti-rotation rod 4 is set inside the oil cylinder, which can reduce the oil cylinder installation space and avoid the problems of corrosion and collision of the anti-rotation rod 4.

[0049] The scope of protection of this utility model is not limited to the specific embodiments described herein, but is determined by the appended claims and equivalents recognized under patent law. This means that all technical solutions that are the same as or equivalent to this utility model in principle and spirit are within the scope of protection of this utility model. Therefore, the inventiveness and practicality of this utility model are not limited to the form currently shown, but also include all possible and reasonable derivatives and extensions.

Claims

1. A built-in anti-rotation hydraulic cylinder, characterized in that, It includes a cylinder and a piston. The cylinder has a chamber and an oil passage hole that communicates with the chamber. The guide sleeve is threadedly connected to the cylinder and locked in place, forming a sealed chamber with the sealing assembly. The piston is connected to the piston rod. The piston moves within the chamber, dividing it into two parts: a rod chamber on the left and a rodless chamber on the right. The piston has an eccentric through hole with a sealing groove.

2. The built-in anti-rotation hydraulic cylinder according to claim 1, characterized in that, The cylinder barrel and cylinder bottom are welded together to form a sealed chamber. The guide sleeve is screwed into the cylinder barrel and locked. The piston is screwed into the piston rod and locked. It moves in the cylinder barrel along the axis and radial direction.

3. A built-in anti-rotation hydraulic cylinder according to claim 1, characterized in that, The piston rod has a rod head pin hole on the outside and an inner hole on the inside. One end of the piston rod is connected to the cylinder by a guide sleeve, and the other end is connected to the cylinder by a piston.

4. A built-in anti-rotation hydraulic cylinder according to claim 1, characterized in that, The cylinder barrel and cylinder bottom are welded together to form a sealed chamber. An L-shaped oil inlet hole is provided on the cylinder bottom, and an inner hole is provided on one side of the cylinder bottom that is opposite to the inner hole of the piston rod.

5. A built-in anti-rotation hydraulic cylinder according to claim 4, characterized in that, Anti-rotation rods are installed in the inner bore of the piston rod and the inner bore of the cylinder bottom.

6. A built-in anti-rotation hydraulic cylinder according to claim 4, characterized in that, The outer circumference of the anti-rotation rod is provided with a guide section that passes through the inner hole of the copper sleeve and the inner hole of the piston rod to restrict the circumferential rotation of the piston.

7. A built-in anti-rotation hydraulic cylinder according to claim 4, 5, or 6, characterized in that, The anti-rotation rod is fixed to the bottom of the cylinder by a set screw. The inner hole of the copper sleeve is provided with a guide groove to cooperate with the piston rod. The end face is drilled with a slit hole and locked with screws to fix the anti-rotation rod.

8. A built-in anti-rotation hydraulic cylinder according to claim 7, characterized in that, The set screw has a cylindrical pin and a plug on the outside.

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