A hydraulic cylinder inner wall rolling device for improving surface quality

Abstract

The present invention discloses a hydraulic cylinder inner wall rolling device for improving surface quality, which relates to the technical field of hydraulic cylinder inner wall rolling. It includes a rolling press, on which a push frame is slidably connected. A fixed frame is arranged on the rolling press through bolts, and a support shaft is fixedly connected to the fixed frame. An oil cavity for storing hydraulic oil is opened in the support shaft. A plurality of mutually connected pressing plates are stepwise clamped on the support shaft. The pressing plate close to the oil cavity of the support shaft is communicated with the oil cavity of the support shaft. A nut is threadedly connected to the support shaft, and a baffle is placed between the nut and the adjacent pressing plate. The present invention realizes stepwise rolling by the way that the number of rollers on the three pressing plates gradually increases to the right. It can not only realize the transition from preliminary shaping to fine processing, make the material deformation more uniform, but also effectively reduce local stress concentration, reduce the possibility of surface microcracks generation, and can more effectively eliminate surface unevenness and residual traces, thus improving the rolling quality.

Description

Technical Field

[0001] The present invention relates to the technical field of internal wall rolling of hydraulic cylinders, and particularly relates to a device for rolling the internal wall of a hydraulic cylinder to improve surface quality. Background Art

[0002] Internal wall rolling of hydraulic cylinders is a technology that mechanically processes the internal wall of hydraulic cylinders through balls or rollers. A hard rolling tool rolls under high pressure over the surface of the inner wall of the cylinder, thereby realizing plastic deformation of the material. This process can improve the surface finish of the inner wall, eliminate micro-cracks and residual stresses, enhance the wear resistance and fatigue resistance of the inner wall of the cylinder, and extend the service life of the hydraulic cylinder.

[0003] In the process of internal wall rolling of hydraulic cylinders, in order to improve the surface quality, the method of gradually increasing the number of rollers on the rolling disc is usually adopted. However, due to the large differences in the internal dimensions of different cylinders, it is necessary to replace the suitable rolling disc before each operation, arrange the rollers in a specific order, and also consider the wear degree of the rollers to avoid data deviation. This process is not only complex in operation but also very time-consuming, seriously affecting the processing efficiency and flexibility. Summary of the Invention

[0004] In order to overcome the disadvantages mentioned in the above background art, the present invention provides a device for rolling the internal wall of a hydraulic cylinder to improve surface quality.

[0005] A device for rolling the internal wall of a hydraulic cylinder to improve surface quality includes a rolling press. A push frame is slidably connected to the rolling press. A fixed frame is provided on the rolling press through bolts. A support shaft is fixedly connected to the fixed frame. An oil cavity for storing hydraulic oil is opened in the support shaft. A plurality of mutually connected pressing discs are stepwise clamped on the support shaft. The pressing disc close to the oil cavity of the support shaft is communicated with the oil cavity of the support shaft. A nut is threadedly connected to the support shaft. A baffle is placed between the nut and the adjacent pressing disc. The baffle is sleeved on the support shaft. An electric push rod is fixedly connected in the oil cavity of the support shaft. A piston block is fixedly connected to the telescopic end of the electric push rod. Slide frames are slidably connected in the pressing discs and are circumferentially and equally spaced. Rollers are rotatably connected to the slide frames. The rollers are located outside the pressing discs. The number of rollers on each pressing disc increases stepwise. Elastic pieces are fixedly connected between the slide frames and the inner side of the pressing discs and are symmetrically distributed along the slide frames.

[0006] As a further preferred solution, through grooves are opened in the pressing discs. Adjacent pressing discs are communicated through the through grooves. The pressing disc close to the oil cavity of the support shaft is communicated with the oil cavity of the support shaft through the through grooves.

[0007] As a further preferred solution, a screw rod and a three-jaw chuck are rotatably arranged on the rolling press. The push frame is threadedly connected to the screw rod on the rolling press.

[0008] As a further preferred solution, it further includes a roundness diameter gauge, the roundness diameter gauge is fixedly connected to the fixed frame, a diameter measuring rod, at least one diameter measuring rod is slidably connected to the roundness diameter gauge, and the diameter measuring rod contacts the adjacent roller.

[0009] As a further preferred solution, it further includes a second one-way valve corresponding to the pressure plate, the second one-way valve is fixedly connected to the through groove on the right side of the corresponding pressure plate, and the first one-way valves are fixedly connected to the through groove on the left side of the pressure plate and on the side of the support shaft oil chamber close to the pressure plate. The second one-way valve is fixedly connected with a push rod, and the push rod contacts the adjacent first one-way valve.

[0010] As a further preferred solution, both the first one-way valve and the second one-way valve are composed of a valve tube, a spring and a valve. The valve tube is fixedly connected to the corresponding pressure plate, the valve is slidably connected to the adjacent valve tube, the spring is fixedly connected between the adjacent valve tube and the valve. The valve of the first one-way valve contacts the adjacent push rod, and the valve of the second one-way valve is fixedly connected to the adjacent push rod.

[0011] As a further preferred solution, it further includes an exhaust cylinder corresponding to the pressure plate, the exhaust cylinder is fixedly connected to the corresponding pressure plate and is communicated with the pressure plate. A slide plate is slidably connected in the exhaust cylinder, the slide plate is fixedly connected with a frustum-shaped breathable floating plate, the breathable floating plate is located in the exhaust cylinder, the breathable floating plate contacts the inner wall of the adjacent exhaust cylinder, and the exhaust cylinder is fixedly connected with a cylinder cover, and there is a gap between the inner wall of the cylinder cover and the outer wall of the adjacent exhaust cylinder.

[0012] As a further preferred solution, both ends of the breathable floating plate are open, and the diameter of the breathable floating plate near the slide plate end is smaller than the diameter of the breathable floating plate far from the slide plate end.

[0013] As a further preferred solution, it further includes a guide frame, the guide frame is slidably connected in the support shaft, a clamping rod for limiting the nut is slidably connected in the support shaft, the guide frame is used to control the clamping rod to extend into and out of the support shaft, and one end of the support shaft is threadedly connected with a screw, and the screw is rotatably connected to the guide frame.

[0014] As a further preferred solution, the guide frame is provided with inclined holes symmetrically distributed along the guide frame, and the guide frame is slidably connected to the clamping rod through the inclined holes.

[0015] The present invention has the following advantages: The present invention realizes stepped rolling by the way that the number of rollers on the three pressure plates gradually increases to the right. It can not only realize the transition from preliminary shaping to fine processing, make the material deformation more uniform, but also effectively reduce local stress concentration, reduce the possibility of surface micro-cracks generation, and can more effectively eliminate surface unevenness and residual traces, so as to improve the rolling quality.

[0016] The present invention automatically regulates the adaptive fitting of each roller to the inner wall of the hydraulic cylinder through the pressure of the hydraulic oil, so that the device is applicable to hydraulic cylinders with different internal dimensions without the need to frequently replace the adapted rolling disc, and also reduces the influence of roller wear on the rolling accuracy of the inner wall of the hydraulic cylinder.

[0017] The elastic piece of the present invention can not only control the reset of the carriage and the roller, but also increase the contact area of the hydraulic oil, making it easier for the carriage to slide outwards, thus facilitating the outward movement of the roller.

[0018] The present invention measures the radius length from the roller to the center of the pressing disc after the roller moves outwards in real time through the diameter measuring rod and the roundness diameter measuring instrument, so as to facilitate determining when to stop the injection pressure of the hydraulic oil.

[0019] By setting the first one-way valve, the second one-way valve and the ejector rod, the present invention ensures that after the pressing disc is removed, the remaining hydraulic oil remains in the pressing disc instead of leaking out through the through groove. On the one hand, it can be used for the next hydraulic use to prevent waste of hydraulic oil, and makes the next injection pressure easier and faster. On the other hand, it can moisturize and maintain the pressing disc to improve the service life of the pressing disc.

[0020] By setting the exhaust cylinder, the slide plate, the breathable floating plate and the cylinder cover, the present invention enables the air in the oil cavity of the pressing disc to be extruded into the external air by the hydraulic oil during the injection pressure process, avoiding the influence of the air in the oil cavity of the pressing disc on the rolling accuracy.

[0021] After tightening the nut, by tightening the screw, the clamping rod moves outwards, thereby limiting the left side of the nut to prevent the nut from loosening to the left. Brief Description of the Drawings

[0022] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0023] Figure 2 It is a three-dimensional structural schematic diagram of components such as the fixing frame, the support shaft and the pressing disc of the present invention.

[0024] Figure 3 It is a three-dimensional structural schematic diagram of components such as the carriage, the roller and the elastic piece of the present invention separated.

[0025] Figure 4 It is a three-dimensional structural schematic diagram of components such as the pressing disc, the nut and the baffle of the present invention.

[0026] Figure 5 It is a three-dimensional structural schematic diagram of components such as the roller, the roundness diameter measuring instrument and the diameter measuring rod of the present invention.

[0027] Figure 6 It is a three-dimensional structural schematic diagram of components such as the electric push rod, the roundness diameter measuring instrument and the diameter measuring rod of the present invention.

[0028] Figure 7 This is a three-dimensional structural schematic diagram of components such as the pressure plate, the first one-way valve, and the second one-way valve of the present invention.

[0029] Figure 8 This is a three-dimensional structural schematic diagram of components such as the first one-way valve, the second one-way valve, and the ejector rod of the present invention.

[0030] Figure 9 This is a three-dimensional structural schematic diagram of components such as the pressure plate, the exhaust cylinder, and the cylinder cover of the present invention.

[0031] Figure 10 This is a three-dimensional structural schematic diagram of components such as the sliding plate, the breathable floating plate, and the cylinder cover of the present invention.

[0032] Figure 11 This is a three-dimensional structural schematic diagram of components such as the guide frame, the clamping rod, and the screw of the present invention.

[0033] Wherein: 1 - rolling machine, 2 - pushing frame, 3 - fixing frame, 4 - support shaft, 5 - pressure plate, 501 - through groove, 6 - nut, 7 - baffle, 8 - electric push rod, 9 - piston block, 10 - sliding frame, 11 - roller, 12 - elastic sheet, 13 - roundness diameter gauge, 14 - diameter measuring rod, 15 - first one-way valve, 16 - second one-way valve, 17 - ejector rod, 18 - exhaust cylinder, 19 - sliding plate, 20 - breathable floating plate, 21 - cylinder cover, 22 - guide frame, 23 - clamping rod, 24 - screw. Specific Embodiment

[0034] The following will further illustrate the present invention in conjunction with specific embodiments. It should also be noted that unless otherwise clearly defined and limited, terms such as: setting, installation, connection, and coupling should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Embodiment 1: A hydraulic cylinder inner wall rolling device for improving surface quality, as Figures 1-4As shown in the figure, it includes a rolling press 1. A screw rod and a three-jaw chuck are respectively rotatably arranged at the lower part and the left part of the rolling press 1. A push frame 2 is slidably connected to the right part of the rolling press 1 in the left-right direction. The push frame 2 is threadedly connected to the screw rod on the rolling press 1. A fixing frame 3 is arranged on the rolling press 1 through bolts. A support shaft 4 is transversely and fixedly connected to the upper part of the fixing frame 3. An oil cavity for storing hydraulic oil is opened in the right part of the support shaft 4. Three mutually connected pressing plates 5 are stepwise clamped on the support shaft 4. The pressing plate 5 close to the oil cavity of the support shaft 4 is communicated with the oil cavity of the support shaft 4. A nut 6 is threadedly connected to the left side of the support shaft 4. A baffle plate 7 is placed between the nut 6 and the leftmost pressing plate 5. The baffle plate 7 is sleeved on the support shaft 4. Two left-right through grooves 501 are opened on the pressing plate 5. The adjacent pressing plates 5 are communicated through the through grooves 501. The rightmost pressing plate 5 is communicated with the oil cavity of the support shaft 4 through the through grooves 501. The baffle plate 7 is used to block the left through groove 501 of the leftmost pressing plate 5. An electric push rod 8 is fixedly connected in the oil cavity of the support shaft 4. A piston block 9 is fixedly connected to the telescopic end of the electric push rod 8. Slide frames 10 are slidably connected in the pressing plate 5 and are circumferentially and equally spaced. Rollers 11 are rotatably connected to the outside of the slide frames 10. The rollers 11 are located outside the pressing plate 5. The number of rollers 11 on the left pressing plate 5 is four, the number of rollers 11 on the middle pressing plate 5 is six, and the number of rollers 11 on the right pressing plate 5 is eight. Elastic pieces 12 symmetrically distributed along the slide frames 10 are fixedly connected between the slide frames 10 and the inner side of the pressing plate 5.

[0036] Place the hydraulic cylinder on the left part of the rolling press 1 and fix it on the three-jaw chuck on the left side of the rolling press 1. Then, control the electric push rod 8 to extend leftward, driving the piston block 9 to move leftward, so as to inject the hydraulic oil in the oil cavity of the support shaft 4 into the three pressing plates 5 in sequence from left to right through the respective through grooves 501. Under the uniform hydraulic action of the hydraulic oil, each slide frame 10 pushes the roller 11 to adaptively move outward synchronously to fit the inner wall of the hydraulic cylinder. The elastic pieces 12 deform adaptively. Then, control the rolling press 1 to drive the hydraulic cylinder to rotate relative to the roller 11 through the three-jaw chuck, so that the roller 11 applies high pressure to the inner wall surface of the hydraulic cylinder, causing the surface layer material of the inner wall of the hydraulic cylinder to undergo plastic deformation and grain refinement, forming a dense hardened layer, significantly improving the surface hardness and surface finish of the inner wall of the hydraulic cylinder. When it is necessary to control the roller 11 to disengage from the inner wall of the hydraulic cylinder, control the electric push rod 8 to shorten rightward, and the elastic pieces 12 reset to drive the slide frames 10 to slide inward, thereby driving the rollers 11 to move inward and disengage from the inner wall of the hydraulic cylinder.

[0037] In summary, the present invention realizes stepped rolling by the way that the number of rollers 11 on the three pressing plates 5 gradually increases rightward. It can not only realize the transition from preliminary shaping to fine machining, make the material deformation more uniform, but also effectively reduce local stress concentration, reduce the possibility of surface microcracks, and can more effectively eliminate surface unevenness and residual traces, thus improving the rolling quality.

[0038] In addition, in the present invention, the pressure of the hydraulic oil is used to automatically regulate the adaptation of each roller 11 to fit the inner wall of the hydraulic cylinder, so that the device is applicable to hydraulic cylinders with different internal dimensions without the need to frequently replace the matching rolling discs, and also reduces the influence of the wear of the roller 11 on the rolling accuracy of the inner wall of the hydraulic cylinder.

[0039] Moreover, the elastic piece 12 of the present invention can not only control the reset of the carriage 10 and the roller 11, but also increase the contact area of the hydraulic oil, making it easier for the carriage 10 to slide outwards, thereby facilitating the outward movement of the roller 11.

[0040] As Figure 5 and Figure 6 shown, it further includes a roundness diameter gauge 13. The roundness diameter gauge 13 is fixedly connected to the fixed frame 3, and a diameter measuring rod 14. At least one diameter measuring rod 14 is slidably connected to the roundness diameter gauge 13. The measuring contact of the diameter measuring rod 14 contacts the adjacent roller 11. The diameter measuring rod 14 converts the mechanical displacement of the diameter measuring rod 14 into an electrical signal through the internal sensor, so that the roundness diameter gauge 13 can record the signal change from the diameter measuring rod 14 in real time to calculate the radius length from the roller 11 to the center of the pressing disc 5.

[0041] In order to determine when to stop the injection pressure of the hydraulic oil, it is necessary to measure the radius length from the roller 11 to the center of the pressing disc 5 in real time through the cooperation of the diameter measuring rod 14 and the roundness diameter gauge 13. When the roller 11 moves outwards to a radius length that is exactly the radius length of the inner wall of the corresponding size hydraulic cylinder, the electric push rod 8 is controlled to stop injecting pressure through the piston block 9.

[0042] Embodiment 2: On the basis of Embodiment 1, as Figure 7 and Figure 8 shown, it further includes a second one-way valve 16 corresponding to the pressing disc 5. The second one-way valve 16 is fixedly connected to the through groove 501 on the right side of the corresponding pressing disc 5. First one-way valves 15 are fixedly connected to the through groove 501 on the left side of the pressing disc 5 and on one side of the oil cavity of the support shaft 4 close to the right pressing disc 5. Both the first one-way valve 15 and the second one-way valve 16 are composed of a valve tube, a spring and a valve. The valve tube is fixedly connected to the corresponding pressing disc 5, the valve slides with the adjacent valve tube, and the spring is fixedly connected between the adjacent valve tube and the valve. A push rod 17 is fixedly connected to the valve of the second one-way valve 16, and the valve of the first one-way valve 15 contacts the adjacent push rod 17.

[0043] In order to ensure that the hydraulic oil remaining in the pressing disc 5 is retained in the oil cavity rather than leaking out through the through groove 501 after the pressing disc 5 is removed, it is necessary to automatically close the corresponding pressing disc 5 when the pressing disc 5 is removed and automatically open the corresponding pressing disc 5 when a new pressing disc 5 is inserted. The specific operation is as follows:

[0044] When inserting a pressure plate 5, under the action of the ejector rod 17 in the newly inserted pressure plate 5, the valves of the first one-way valve 15 and the second one-way valve 16 adjacent to the ejector rod 17 are both pushed open, and the springs adjacent to the ejector rod 17 are compressed. The hydraulic oil flows into the newly inserted pressure plate 5 through the first one-way valve 15 and the second one-way valve 16. When removing a pressure plate 5, the left side of the removed pressure plate 5 is pre-closed by the valve of the first one-way valve 15, and the ejector rod 17 on the right side in the removed pressure plate 5 is separated from the adjacent valve of the first one-way valve 15, causing the valve of the second one-way valve 16 in the removed pressure plate 5 to automatically close. As a result, the right side of the removed pressure plate 5 is closed by the valve of the second one-way valve 16, and the valve of the first one-way valve 15 of the leftmost pressure plate 5 that remains unremoved also automatically closes, making the left side of the leftmost unremoved pressure plate 5 closed by the valve of the first one-way valve 15.

[0045] In this way, it can be ensured that when removing the pressure plate 5, the corresponding pressure plate 5 automatically closes, and when inserting the pressure plate 5, the corresponding pressure plate 5 automatically opens. Thus, after removing the pressure plate 5, the remaining hydraulic oil remains in the pressure plate 5 instead of leaking out through the through groove 501. On the one hand, it can be used as hydraulic oil for the next time, preventing waste of hydraulic oil, and making the next injection more relaxed and fast. On the other hand, it can conduct wet maintenance on the pressure plate 5, improving the service life of the pressure plate 5.

[0046] Embodiment 3: On the basis of Embodiment 2, as Figure 9 and Figure 10 shown, it further includes an exhaust cylinder 18 corresponding to the pressure plate 5. The exhaust cylinder 18 is fixedly connected to the corresponding pressure plate 5 and is communicated with the adjacent pressure plate 5. A slide plate 19 is slidably connected in the exhaust cylinder 18 in the up and down direction. A frustum-shaped breathable floating plate 20 is fixedly connected to the bottom of the slide plate 19. The breathable floating plate 20 is located in the exhaust cylinder 18. The lower part of the outer side wall of the breathable floating plate 20 is in contact with the inner wall of the adjacent exhaust cylinder 18. Both the upper and lower ends of the breathable floating plate 20 are open, and the diameter of the upper end of the breathable floating plate 20 is smaller than the diameter of the lower end of the breathable floating plate 20. A cylinder cover 21 is fixedly connected to the upper part of the exhaust cylinder 18, and a gap is provided between the inner wall of the cylinder cover 21 and the outer wall of the adjacent exhaust cylinder 18.

[0047] During the injection process, as the hydraulic oil enters the pressure plate 5, the air in the pressure plate 5 is squeezed out by the hydraulic oil to the lower part of the exhaust cylinder 18, and then discharged to the top of the exhaust cylinder 18 through the breathable holes on the breathable floating plate 20. Finally, it is discharged to the external air through the gap between the outer wall of the exhaust cylinder 18 and the inner wall of the cylinder cover 21. After the air in the pressure plate 5 is squeezed out, due to the density of the hydraulic oil being much higher than that of the air, the hydraulic oil hardly passes through the breathable holes of the breathable floating plate 20. Under the buoyancy effect of the hydraulic oil, the breathable floating plate 20 pushes the slide plate 19 to slide upward to seal the upper outlet of the exhaust cylinder 18, thus achieving the exhaust effect.

[0048] Example 4: Based on Example 3, Figure 11 As shown, it also includes a guide frame 22, which is slidably connected to the support shaft 4 along the left and right directions. The guide frame 22 is provided with oblique holes symmetrically distributed along the front and back of the guide frame 22. A clamping rod 23 is slidably connected to the support shaft 4 along the up and down directions. When the clamping rod 23 extends upward from the support shaft 4, the nut 6 is limited. The guide frame 22 is slidably connected to the clamping rod 23 through the oblique hole. The guide frame 22 controls the clamping rod 23 to extend into and out of the support shaft 4 through the oblique hole. The left end of the support shaft 4 is threadedly connected to a screw 24, and the right end of the screw 24 is rotatably connected to the guide frame 22.

[0049] In order to prevent the nut 6 from loosening, after tightening the nut 6, the screw 24 is tightened to move the guide frame 22 to the right, and the guide frame 22 squeezes the clamping rod 23 outward through the inclined hole, thereby limiting the left side of the nut 6 and preventing the nut 6 from loosening to the left.

[0050] The technical principles of the embodiments of the present invention have been described above in conjunction with specific embodiments. These descriptions are intended solely to explain the principles of the embodiments of the present invention and should not be construed in any way as limiting the scope of protection of the embodiments of the present invention. Based on the explanations herein, those skilled in the art will be able to conceive of other specific implementations of the embodiments of the present invention without inventive effort, and such implementations will fall within the scope of protection of the embodiments of the present invention.

Claims

1. A hydraulic cylinder inner wall rolling device for improving surface quality, comprising a rolling machine (1), a push frame (2) is slidably connected to the rolling machine (1), a fixing frame (3) is arranged on the rolling machine (1) through bolts, and a support shaft (4) is fixedly connected to the fixing frame (3), characterized in that: The support shaft (4) is internally provided with an oil cavity for storing hydraulic oil. A plurality of interconnected pressure plates (5) are stepwise clamped on the support shaft (4). The pressure plate (5) close to the oil cavity of the support shaft (4) is communicated with the oil cavity of the support shaft (4). A nut (6) is threadedly connected to the support shaft (4). A baffle (7) is placed between the nut (6) and the adjacent pressure plate (5). The baffle (7) is sleeved on the support shaft (4). An electric push rod (8) is fixedly connected inside the oil cavity of the support shaft (4). The telescopic end of the electric push rod (8) is fixedly connected with a piston block (9). Slide frames (10) evenly distributed at equal intervals in the circumferential direction are slidably connected inside the pressure plate (5). The slide frames (10) are rotatably connected with rollers (11). The rollers (11) are located outside the pressure plate (5). The number of rollers (11) on each pressure plate (5) increases stepwise. Elastic pieces (12) symmetrically distributed along the slide frames (10) are fixedly connected between the slide frames (10) and the inner side of the pressure plate (5).

2. The internal wall rolling device for a hydraulic cylinder to improve surface quality according to claim 1, characterized in that: The pressure plate (5) is provided with a through groove (501). The adjacent pressure plates (5) are communicated through the through groove (501). The pressure plate (5) close to the oil cavity of the support shaft (4) is communicated with the oil cavity of the support shaft (4) through the through groove (501).

3. A hydraulic cylinder inner wall rolling device for improving surface quality according to claim 2, characterized in that: A screw rod and a three-jaw chuck are rotatably arranged on the rolling press (1). The push frame (2) is threadedly connected with the screw rod on the rolling press (1).

4. A hydraulic cylinder inner wall rolling device for improving surface quality according to claim 3, characterized in that: It further includes a roundness diameter gauge (13). The roundness diameter gauge (13) is fixedly connected to the fixed frame (3). A diameter measuring rod (14). At least one diameter measuring rod (14) is slidably connected to the roundness diameter gauge (13). The diameter measuring rod (14) contacts the adjacent roller (11).

5. The hydraulic cylinder inner wall rolling device for improving surface quality according to claim 4, characterized in that: It further includes a second one-way valve (16) corresponding to the pressure plate (5). The second one-way valve (16) is fixedly connected in the through groove (501) on the right side of the corresponding pressure plate (5). First one-way valves (15) are fixedly connected in the through groove (501) on the left side of the pressure plate (5) and on the side of the oil cavity of the support shaft (4) close to the pressure plate (5). The second one-way valve (16) is fixedly connected with a push rod (17). The push rod (17) contacts the adjacent first one-way valve (15).

6. A hydraulic cylinder inner wall rolling device for improving surface quality according to claim 5, characterized in that: Both the first one-way valve (15) and the second one-way valve (16) are composed of a valve tube, a spring and a valve. The valve tube is fixedly connected to the corresponding pressure plate (5). The valve slides in the adjacent valve tube. The spring is fixedly connected between the adjacent valve tube and the valve. The valve of the first one-way valve (15) contacts the adjacent push rod (17). The valve of the second one-way valve (16) is fixedly connected with the adjacent push rod (17).

7. The hydraulic cylinder inner wall rolling device for improving surface quality according to claim 6, characterized in that: It further includes an exhaust cylinder (18) corresponding to the pressure plate (5). The exhaust cylinder (18) is fixedly connected to the corresponding pressure plate (5) and is communicated with the pressure plate (5). A slide plate (19) is slidably connected in the exhaust cylinder (18). The slide plate (19) is fixedly connected with a frustum-shaped breathable floating plate (20). The breathable floating plate (20) is located inside the exhaust cylinder (18). The breathable floating plate (20) contacts the inner wall of the adjacent exhaust cylinder (18). The exhaust cylinder (18) is fixedly connected with a cylinder cover (21). A gap is provided between the inner wall of the cylinder cover (21) and the outer wall of the adjacent exhaust cylinder (18).

8. The inner wall rolling device for hydraulic cylinder to improve surface quality as claimed in claim 7, wherein: Both ends of the breathable floating board (20) are open, and the diameter of the breathable floating board (20) near one end of the skateboard (19) is smaller than the diameter of the breathable floating board (20) far from one end of the skateboard (19).

9. A hydraulic cylinder inner wall rolling device for improving surface quality according to claim 8, characterized in that: It further includes a guide frame (22). The guide frame (22) is slidably connected to the support shaft (4). A clamping rod (23) for limiting the nut (6) is slidably connected in the support shaft (4). The guide frame (22) is used to control the clamping rod (23) to extend into and out of the support shaft (4). One end of the support shaft (4) is threadedly connected with a screw (24), and the screw (24) is rotatably connected to the guide frame (22).

10. A hydraulic cylinder inner wall rolling device for improving surface quality according to claim 9, characterized in that: The guide frame (22) is provided with inclined holes symmetrically distributed along the guide frame (22), and the guide frame (22) is slidably connected with the clamping rod (23) through the inclined holes.

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