CN221236980U

CN221236980U - Automatic pin pulling oil cylinder

Info

Publication number: CN221236980U
Application number: CN202322792889.9U
Authority: CN
Inventors: 黎雄坚
Original assignee: Smk Hydraulic Cylinder Co ltd
Current assignee: Smk Hydraulic Cylinder Co ltd
Priority date: 2023-10-18
Filing date: 2023-10-18
Publication date: 2024-06-28
Anticipated expiration: 2033-10-18

Abstract

The utility model discloses an automatic pin pulling oil cylinder which comprises a cylinder barrel, a connecting device, a piston rod, a piston, a cylinder bottom, a cylinder cover, a sealing guide device, a buffer device and an initiating device, wherein the cylinder barrel is transversely arranged, the connecting device is arranged on the periphery of the left end of the cylinder barrel and is used for connecting an external pin pulling device to be pulled out, the piston rod is arranged in the cylinder barrel and extends out of the cylinder barrel leftwards and can move leftwards or rightwards relative to the cylinder barrel, the piston is sleeved on the right end of the piston rod, the sealing guide device is arranged on the inner periphery of the left end of the cylinder barrel and is used for guiding the piston rod to move leftwards and rightwards relative to the cylinder barrel in a matched manner, meanwhile, the left end of the sealing guide device is provided with the cylinder cover, the cylinder cover is flush with the tail end of the cylinder barrel, the right end of the cylinder barrel is provided with the cylinder bottom, and the buffer device is arranged at the right end of the piston. The utility model has the advantages of wide application range, high running stability, low failure rate, simple assembly and disassembly operation and good safety.

Description

Automatic pin pulling oil cylinder

Technical Field

The utility model relates to the technical field of hydraulic cylinders, in particular to an automatic pin pulling cylinder.

Background

The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). The device has simple structure and reliable operation. When it is used to realize reciprocating motion, it can eliminate speed reducer, and has no transmission clearance and smooth motion, so that it can be widely used in hydraulic systems of various machines. The output force of the hydraulic cylinder is in direct proportion to the effective area of the piston and the pressure difference between two sides of the effective area of the piston; the hydraulic cylinder basically consists of a cylinder barrel, a cylinder cover, a piston rod, a sealing device, a buffer device and an exhaust device. The device can be divided into linear reciprocating motion type and rotary swing type according to the motion mode; the working principle of the hydraulic cylinder doing linear reciprocating motion is as follows: by utilizing the two one-way valves, after the hydraulic cylinder reaches the end point, the lower part of the one-way valve is communicated with the other oil inlet pipe, and oil is turned to the other oil inlet pipe to push the oil cylinder. Because the two one-way valves are communicated, the labor is saved in any aspect, and the oil flows into any oil pipe until the hydraulic pressure at the two ends is balanced.

The automatic pin pulling cylinder is a hydraulic cylinder capable of automatically pulling out pins and is generally applied to places with a certain danger in pin pulling. The design requirements include: the pin pulling force is large enough to pull out the pin and ensure the safety and reliability of the pin; the pin pulling speed is moderate and cannot be too high or too low so as not to damage the pin pulling device; the stability and reliability of the hydraulic cylinder are ensured in the pin pulling process, and oil leakage or other faults are avoided; the size and the shape of the hydraulic cylinder are suitable for application occasions, and the hydraulic cylinder is convenient to install and maintain; the hydraulic cylinder is made of wear-resistant, corrosion-resistant and high-strength materials so as to ensure the service life and the working efficiency.

In the prior art, the automatic pin pulling oil cylinder has the following defects: the failure rate is high, the mechanical parts of the existing automatic pin pulling oil cylinder are more, the failure is easy to occur, and frequent maintenance and replacement are required; the operation is complex, the existing automatic pin pulling oil cylinder needs to be controlled electrically or pneumatically, the operation is complex, and professional personnel are required to operate and maintain; the potential safety hazard is high, the accident situation can occur when the existing automatic pin pulling oil cylinder is operated, and the potential safety hazard can be caused to personnel and equipment; the application range is limited, the existing automatic pin pulling oil cylinder is only suitable for specific production scenes, cannot be suitable for all production processes, and the application range is limited.

In conclusion, the market needs to have a wide application range suitable for market demands, high running stability, low failure rate, and simple and safe automatic pin pulling cylinder for assembly and disassembly operation.

Disclosure of utility model

According to the defects of the prior art, the utility model provides the automatic pin pulling oil cylinder which is simple in structure, high in operation stability, low in failure rate, simple in assembly and disassembly operation, good in safety and wide in application range.

In order to solve the technical problems, the technical scheme of the utility model is as follows: the automatic pin pulling cylinder comprises a cylinder barrel, a connecting device, a piston rod, a piston, a cylinder bottom, a cylinder cover, a sealing guide device, a buffer device and an initiating device, wherein the cylinder barrel is transversely arranged, the connecting device is arranged at the periphery of the left end of the cylinder barrel and is used for connecting an external pin pulling device to be pulled out, the piston rod is arranged in the cylinder barrel, extends out of the cylinder barrel leftwards and can move leftwards or rightwards relative to the cylinder barrel, the left end of the piston rod is connected with a pin of the pin pulling device to be pulled out, the piston is sheathed at the right end of the piston rod, the sealing guide device is arranged at the inner periphery of the left end of the cylinder barrel and is used for guiding the piston rod to move leftwards and rightwards relative to the cylinder barrel in a mutually matched manner, the left end of the sealing guide device is provided with the cylinder cover, the cylinder cover is flush with the tail end of the cylinder barrel, the right end of the cylinder barrel is provided with a cylinder bottom, the buffer device is arranged at the right end of the piston, the inner circumference of the left end of the cylinder bottom is provided with a containing space with the shape matched with the buffer device, the buffer device is used for containing the buffer device when the piston rod moves rightwards to prevent the damage or the collision of the cylinder bottom in the working process of the piston, the trigger device is used for sensing and controlling the movement of the piston rod and comprises a first trigger device and a second trigger device which are arranged at the lower end of the cylinder barrel, the first trigger device is positioned at the right end side of the sealing guide device and used for controlling the piston rod to move leftwards relative to the cylinder barrel while sensing the position of the piston relative to the sealing guide device and controlling the piston rod to stop moving leftwards, the second trigger device is positioned at the right end side of the containing space and used for controlling the piston rod to move rightwards relative to the cylinder barrel while sensing the position of the buffer device relative to the cylinder bottom, and controls the piston rod to stop moving rightward.

As a further illustration of the utility model:

Preferably, the connecting device comprises a connecting flange which is flush with the ends of the cylinder cover and the cylinder barrel and is used for connecting an external pin device to be pulled out.

Preferably, the engine further comprises a first oil hole and a second oil hole which are communicated through an external oil pipe, the diameters of the first oil hole and the second oil hole are the same and used for entering and exiting power oil, the first oil hole is arranged on the cylinder barrel at the right end of the sealing guide device in a penetrating mode, the second initiating device is electrically connected with the first oil hole and used for controlling the power oil to enter the inner periphery of the cylinder barrel through the first oil hole, the piston is pushed to drive the piston rod to move rightwards relative to the cylinder barrel, the second oil hole penetrates through the cylinder bottom and is communicated with the inside of the cylinder barrel, the first initiating device is electrically connected with the second oil hole and used for controlling the power oil to enter between the cylinder barrel and the buffering device through the second oil hole, and the piston is pushed to drive the piston rod to move leftwards relative to the cylinder barrel.

Preferably, the right-hand member of piston rod is equipped with the first installation department of shape and piston rod assorted installation piston, and the right-hand member of first installation department is equipped with the second installation department of shape and piston rod assorted installation buffer, the piston cup joints in the periphery of first installation department, and buffer wraps up in the second installation department and fixes through fastening screw, and the diameter of first installation department is the same with the diameter of second installation department, just is less than the piston rod.

Preferably, a piston sealing ring and a piston guide sleeve are sequentially arranged between the periphery of the piston and the inner wall of the cylinder barrel from left to right, two sleeve sealing rings which are uniformly distributed are arranged between the inner periphery of the piston and the first installation part, the piston guide sleeve is used for supporting and guiding the piston to move left and right relative to the cylinder barrel, and the piston sealing rings and the sleeve sealing rings are mutually matched and used for preventing power oil from leaking through the piston when the piston moves.

Preferably, the left end inner circumference of the cylinder barrel is inwards sunken to form a baffle part, the sealing guide device is arranged at the left end of the baffle part, two baffle sealing rings are uniformly distributed between the sealing guide device and the inner wall of the cylinder barrel, a first piston rod sealing ring, a second piston rod sealing ring and a piston rod guiding ring are sequentially arranged between the inner circumference of the sealing guide device and the piston rod from left to right, the piston rod guiding ring is used for guiding the piston rod to move left and right relative to the cylinder barrel, and the first piston rod sealing ring and the second piston rod sealing ring are mutually matched for preventing power oil from overflowing and simultaneously preventing external impurities from entering the cylinder barrel.

Preferably, a dustproof sealing ring and a piston rod supporting ring are sequentially arranged between the inner periphery of the cylinder cover and the piston rod from left to right, the dustproof sealing ring is used for being matched with the first piston rod sealing ring and the second piston rod sealing ring to prevent external impurities from entering the cylinder barrel, and the piston rod supporting ring is used for being matched with the piston rod guiding ring to support and guide the piston rod to move left and right relative to the cylinder barrel.

Preferably, the diameter of the outer periphery of the cylinder barrel is 104.0 mm-124.0 mm, the diameter of the inner periphery of the cylinder barrel is 85.0 mm-95.0 mm, the length of the cylinder barrel is 385.0 mm-405.0 mm, the diameter of a piston rod is 45.0 mm-55.0 mm, the length from the hole center of the first oil hole to the end side of the left end of the cylinder barrel is 65.0 mm-85.0 mm, the length from the hole center of the second oil hole to the end side of the right end of the cylinder bottom is 23.0 mm-31.0 mm, the length of the piston is 55.0 mm-65.0 mm, the diameter of the connecting flange is 255.0 mm-275.0 mm, the thickness of the connecting flange is 14.0 mm-18.0 mm, the working stroke of the piston is 180.0 mm-200.0 mm, the working pressure is 15 MPa-18 MPa, and the test pressure is 30 MPa-35 MPa.

Preferably, the sleeve sealing ring, the baffle sealing ring and the dustproof sealing ring are O-shaped sealing rings.

The beneficial effects of the utility model are as follows:

The sealing guide device is arranged on the inner periphery of the left end of the cylinder barrel and used for guiding the piston rod to move left and right relative to the cylinder barrel in a mutually matched manner with the piston, and meanwhile, the buffer device is arranged on the right end of the piston, the inner periphery of the left end of the cylinder bottom is provided with a containing space with the shape matched with the buffer device and used for containing the buffer device when the piston rod moves rightwards, the phenomenon that the cylinder bottom is damaged or crashed in the working process of the piston is prevented, the piston guide sleeve is used for supporting and guiding the piston to move left and right relative to the cylinder barrel, the piston sealing ring and the sleeve sealing ring are mutually matched and used for preventing power oil from leaking through the piston when the piston moves, the dustproof sealing ring is used for matching with the first piston rod sealing ring and the second piston rod sealing ring to prevent external impurities from entering the cylinder barrel, and the piston rod supporting ring is used for supporting and guiding the piston rod to move left and right relative to the cylinder barrel.

The second oil hole penetrates through the cylinder bottom and is communicated with the inside of the cylinder, the first oil hole is electrically connected with the second oil hole and is used for controlling the power oil to enter the inner periphery of the cylinder through the first oil hole, the piston is driven by the piston to move rightwards relative to the cylinder, the power oil enters between the cylinder and the buffer device through the second oil hole, the piston is driven by the piston to move leftwards relative to the cylinder, the left end tail side of the piston rod is connected with a pin of a pin pulling device to be pulled out, the automatic pin pulling can be achieved through simple operation, no professional is required to operate and maintain, the connecting device comprises a connecting flange, the connecting flange is flush with the tail ends of the cylinder cover and the cylinder, the connecting flange is used for connecting an external pin pulling device to be pulled out, and the connecting device is convenient to install and detach.

The utility model overcomes the defects that the prior art has limited application range, is only suitable for specific production scenes and cannot be suitable for all production processes, and has wide application range, good use effect and long service life.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model.

Fig. 2 is a left side view of the present utility model.

In the figure: 1. a cylinder; 2. a piston rod; 3. a cylinder bottom; 4. a cylinder cover; 5. a piston; 6. a first oil hole; 7. a second oil hole; 8. a connecting flange; 9. a buffer device; 10. a first initiating device; 11. a second initiating means; 12. a first mounting portion; 13. a second mounting portion; 14. a fastening screw; 15. a piston seal ring; 16. a piston guide sleeve; 17. sleeving a sealing ring; 18. a baffle sealing ring; 19. a first piston rod seal ring; 20. a piston rod guide ring; 21. a dust-proof sealing ring; 22. a piston rod supporting ring.

Detailed Description

The structural and operational principles of the present utility model will be described in further detail below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the utility model is an automatic pin pulling cylinder, comprising a cylinder 1, a connecting device, a piston rod 2, a piston 5, a cylinder bottom 3, a cylinder cover 4, a sealing guide device, a buffer device 9 and an initiating device, wherein the cylinder 1 is transversely arranged, the connecting device is arranged at the periphery of the left end of the cylinder 1 and is used for connecting an external pin pulling device, the piston rod 2 is arranged in the cylinder 1 and extends leftwards to the outside of the cylinder 1 and can move leftwards or rightwards relative to the cylinder 1, the left end of the piston rod 2 is connected with a pin of the pin pulling device, the piston 5 is sheathed at the right end of the piston rod 2, the sealing guide device is arranged at the inner periphery of the left end of the cylinder 1 and is used for guiding the piston rod 2 to move leftwards and rightwards relative to the cylinder 1 in a mutual matching way with the piston 5, and is used for preventing external impurities from entering the inside of the cylinder 1, the left end of the sealing guide device is provided with a cylinder cover 4, the cylinder cover 4 is flush with the tail end of the cylinder barrel 1, the right end of the cylinder barrel 1 is provided with a cylinder bottom 3, the buffer device 9 is arranged at the right end of the piston 5, the inner circumference of the left end of the cylinder bottom 3 is provided with a containing space with the shape matched with the buffer device 9, the buffer device 9 is used for containing the buffer device 9 when the piston rod 2 moves rightwards to prevent the piston 5 from damaging or crashing the cylinder bottom 3 in the working process, the trigger device is used for sensing and controlling the movement of the piston rod 2, the trigger device comprises a first trigger device 10 and a second trigger device 11 which are arranged at the lower end of the cylinder barrel 1, the first trigger device 10 is positioned at the tail end of the right end of the sealing guide device and used for controlling the piston rod 2 to move leftwards relative to the cylinder barrel 1 and simultaneously sensing the position of the piston 5 relative to the sealing guide device and controlling the piston rod 2 to stop leftwards movement, the second triggering device 11 is located at the right end of the accommodating space, and is used for controlling the piston rod 2 to move rightwards relative to the cylinder barrel 1, sensing the position of the buffer device 9 relative to the cylinder bottom 3, and controlling the piston rod 2 to stop moving rightwards.

As shown in fig. 1 and 2, the connecting device comprises a connecting flange 8, and the connecting flange 8 is flush with the tail ends of the cylinder cover 4 and the cylinder barrel 1 and is used for connecting an external pin device to be pulled out.

As shown in fig. 1, the engine further comprises a first oil hole 6 and a second oil hole 7 which are communicated through an external oil pipe, the diameters of the first oil hole 6 and the second oil hole 7 are the same and used for entering and exiting power oil, the first oil hole 6 is arranged on the cylinder barrel 1 at the right end of the sealing guide device in a penetrating mode, the second initiation device 11 is electrically connected with the first oil hole 6 and used for controlling the power oil to enter the inner periphery of the cylinder barrel 1 through the first oil hole 6, the piston 5 is pushed to drive the piston rod 2 to move rightwards relative to the cylinder barrel 1, the second oil hole 7 penetrates through the cylinder bottom 3 and is communicated with the inside of the cylinder barrel 1, the first initiation device 10 is electrically connected with the second oil hole 7 and used for controlling the power oil to enter between the cylinder barrel 1 and the buffer device 9 through the second oil hole 7, and the piston 5 is pushed to drive the piston rod 2 to move leftwards relative to the cylinder barrel 1.

As shown in fig. 1, the right end of the piston rod 2 is provided with a first mounting portion 12 with a shape matching with the piston rod 2 for mounting the piston 5, the right end of the first mounting portion 12 is provided with a second mounting portion 13 with a shape matching with the piston rod 2 for mounting the buffer device 9, the piston 5 is sleeved on the periphery of the first mounting portion 12, the buffer device 9 is wrapped on the second mounting portion 13 and fixed by a fastening screw 14, in this embodiment, the piston rod 2, the first mounting portion 12 and the second mounting portion 13 are in an integral structure, and the diameters of the first mounting portion 12 and the second mounting portion 13 are the same and smaller than the diameter of the piston rod 2.

As shown in fig. 1, a piston sealing ring 15 and a piston guiding sleeve 16 are sequentially arranged between the outer periphery of the piston 5 and the inner wall of the cylinder barrel 1 from left to right, two sleeve sealing rings 17 which are uniformly distributed are arranged between the inner periphery of the piston 5 and the first mounting part 12, the piston guiding sleeve 16 is used for supporting and guiding the piston 5 to move left and right relative to the cylinder barrel 1, and the piston sealing ring 15 and the sleeve sealing rings 17 are mutually matched for preventing power oil from leaking through the piston 5 when the piston 5 moves.

As shown in fig. 1, the inner circumference of the left end of the cylinder barrel 1 is recessed inwards to form a blocking part, the sealing guide device is arranged at the left end of the blocking part, two blocking sealing rings 18 which are uniformly distributed are arranged between the sealing guide device and the inner wall of the cylinder barrel 1, a first piston rod sealing ring 19, a second piston rod sealing ring and a piston rod guiding ring 20 are sequentially arranged between the inner circumference of the sealing guide device and the piston rod 2 from left to right, the piston rod guiding ring 20 is used for guiding the piston rod 2 to move left and right relative to the cylinder barrel 1, and the first piston rod sealing ring 19 and the second piston rod sealing ring are mutually matched for preventing power oil from overflowing and simultaneously preventing external impurities from entering the cylinder barrel 1.

As shown in fig. 1, a dustproof sealing ring 21 and a piston rod supporting ring 22 are sequentially arranged between the inner periphery of the cylinder cover 4 and the piston rod 2 from left to right, the dustproof sealing ring 21 is used for being matched with the first piston rod sealing ring 19 and the second piston rod sealing ring to prevent external impurities from entering the cylinder barrel 1, and the piston rod supporting ring 22 is used for being matched with the piston rod guiding ring 20 to support and guide the piston rod 2 to move left and right relative to the cylinder barrel 1.

Further, the diameter of the outer periphery of the cylinder barrel 1 is 104.0 mm-124.0 mm, the diameter of the inner periphery of the cylinder barrel 1 is 85.0 mm-95.0 mm, the length of the cylinder barrel 1 is 385.0 mm-405.0 mm, the diameter of the piston rod 2 is 45.0 mm-55.0 mm, the length from the hole center of the first oil hole 6 to the end side of the left end of the cylinder barrel 1 is 65.0 mm-85.0 mm, the length from the hole center of the second oil hole 7 to the end side of the right end of the cylinder bottom 3 is 23.0 mm-31.0 mm, the length of the piston 5 is 55.0 mm-65.0 mm, the diameter of the connecting flange 8 is 255.0 mm-275.0 mm, the thickness of the connecting flange 8 is 14.0 mm-18.0 mm, the working stroke of the piston 5 is 180.0 mm-200.0 mm, the working pressure is 15 MPa-18 MPa, and the test pressure is 30 MPa-35 MPa. In this embodiment, the outer diameter of the cylinder 1 is 114.0mm, the inner diameter of the cylinder 1 is 90.0mm, the length of the cylinder 1 is 395.0mm, the diameter of the piston rod 2 is 50.0mm, the length from the center of the first oil hole 6 to the left end of the cylinder 1 is 75.0mm, the length from the center of the second oil hole 7 to the right end of the cylinder bottom 3 is 27.0mm, the length of the piston 5 is 60.0mm, the diameter of the connecting flange 8 is 265.0mm, the thickness of the connecting flange 8 is 16.0mm, the working stroke of the piston 5 is 190.0mm, the working pressure is 16MPa, and the test pressure is 30 MPa-35 MPa.

Further, in this embodiment, the sleeve seal ring 17, the baffle seal ring 18 and the dust seal ring 21 are O-shaped seal rings.

The embodiments described by referring to the drawings are exemplary and intended to be illustrative of the application and are not to be construed as limiting the application. In the description of the present application, it should be understood that the azimuth or positional relationship indicated by the terms "left", "right", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature.

In the foregoing, only the preferred embodiment of the present utility model is described, and any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical solutions of the present utility model fall within the scope of the technical solutions of the present utility model.

Claims

1. An automatic pin pulling oil cylinder is characterized in that: the piston rod is arranged in the cylinder barrel and extends out of the cylinder barrel leftwards and rightwards relative to the cylinder barrel, the left end of the piston rod is connected with a pin of the pin pulling device to be pulled out, the piston is sleeved on the right end of the piston rod, the sealing guiding device is arranged on the inner periphery of the left end of the cylinder barrel and used for guiding the piston rod to move leftwards and rightwards relative to the cylinder barrel in a mutually matched mode, meanwhile, the left end of the sealing guiding device is provided with a cylinder cover which is flush with the tail end of the cylinder barrel, the right end of the cylinder barrel is provided with the cylinder bottom, the buffering device is arranged at the right end of the piston, a containing space matched with the buffering device in shape is arranged at the inner periphery of the left end of the cylinder bottom and used for containing the buffering device when the piston rod moves rightwards, damage or collision of the bottom is prevented in the working process of the piston, the sealing guiding device is used for guiding the piston rod to move leftwards relative to the cylinder barrel by mutually matching with the piston, and is used for preventing the outer impurities from entering the cylinder barrel, and simultaneously, the sealing guiding device is arranged at the left end of the cylinder barrel is used for guiding the piston rod to move leftwards relative to the cylinder barrel, and the piston rod is stopped, and the piston rod is controlled to move leftwards relative to the piston rod is controlled to the piston rod is arranged at the right end of the cylinder barrel.

2. The automatic pin pulling cylinder as defined in claim 1, wherein: the connecting device comprises a connecting flange, wherein the connecting flange is flush with the tail ends of the cylinder cover and the cylinder barrel and is used for connecting an external pin to be pulled out device.

3. The automatic pin pulling cylinder as defined in claim 2, wherein: the engine oil cylinder is characterized by further comprising a first oil hole and a second oil hole which are communicated through an external oil pipe, wherein the diameters of the first oil hole and the second oil hole are the same and used for entering and exiting power oil, the first oil hole is arranged on the cylinder barrel at the right end of the sealing guide device in a penetrating mode, the second initiation device is electrically connected with the first oil hole and used for controlling the power oil to enter the inner periphery of the cylinder barrel through the first oil hole, the piston is pushed to drive the piston rod to move rightwards relative to the cylinder barrel, the second oil hole penetrates through the cylinder bottom and is communicated with the inside of the cylinder barrel, and the first initiation device is electrically connected with the second oil hole and used for controlling the power oil to enter between the cylinder barrel and the buffer device through the second oil hole and pushing the piston to drive the piston rod to move leftwards relative to the cylinder barrel.

4. The automatic pin pulling cylinder as set forth in claim 3, wherein: the right-hand member of piston rod is equipped with the first installation department of shape and piston rod assorted installation piston, and the right-hand member of first installation department is equipped with the second installation department of shape and piston rod assorted installation buffer, the piston cup joints in the periphery of first installation department, and buffer wraps up on the second installation department and fixes through fastening screw, and the diameter of first installation department is the same with the diameter of second installation department, and is less than the diameter of piston rod.

5. The automatic pin pulling cylinder as defined in claim 4, wherein: the piston guide sleeve is used for supporting and guiding the piston to move left and right relative to the cylinder barrel, and the piston seal ring and the sleeve seal ring are mutually matched and used for preventing power oil from leaking through the piston when the piston moves.

6. The automatic pin pulling cylinder as defined in claim 5, wherein: the inner circumference of the left end of the cylinder barrel is inwards sunken to form a baffle part, the sealing guide device is arranged at the left end of the baffle part, two baffle sealing rings are uniformly distributed between the sealing guide device and the inner wall of the cylinder barrel, a first piston rod sealing ring, a second piston rod sealing ring and a piston rod guiding ring are sequentially arranged between the inner circumference of the sealing guide device and the piston rod from left to right, the piston rod guiding ring is used for guiding the piston rod to move left and right relative to the cylinder barrel, and the first piston rod sealing ring and the second piston rod sealing ring are mutually matched for preventing power oil from overflowing and simultaneously preventing external impurities from entering the cylinder barrel.

7. The automatic pin pulling cylinder as defined in claim 6, wherein: the cylinder cover is characterized in that a dustproof sealing ring and a piston rod supporting ring are sequentially arranged between the inner periphery of the cylinder cover and the piston rod from left to right, the dustproof sealing ring is used for being matched with the first piston rod sealing ring and the second piston rod sealing ring to prevent external impurities from entering the cylinder barrel, and the piston rod supporting ring is used for being matched with the piston rod guiding ring to be used for supporting and guiding the piston rod to move left and right relative to the cylinder barrel.

8. The automatic pin pulling cylinder as defined in claim 7, wherein: the diameter of the outer periphery of the cylinder barrel is 104.0-124.0 mm, the diameter of the inner periphery of the cylinder barrel is 85.0-95.0 mm, the length of the cylinder barrel is 385.0-405.0 mm, the diameter of a piston rod is 45.0-55.0 mm, the length from the center of a first oil hole to the left end of the cylinder barrel is 65.0-85.0 mm, the length from the center of a second oil hole to the right end of the cylinder barrel is 23.0-31.0 mm, the length of a piston is 55.0-65.0 mm, the diameter of a connecting flange is 255.0-275.0 mm, the thickness of the connecting flange is 14.0-18.0 mm, the working stroke of the piston is 180.0-200.0 mm, the working pressure is 15-18 MPa, and the test pressure is 30-35 MPa.

9. The automatic pin pulling cylinder as defined in claim 7, wherein: the sleeve joint sealing ring, the baffle sealing ring and the dustproof sealing ring are O-shaped sealing rings.