Cylinder body inner wall polishing mechanism for hydraulic oil cylinder

Abstract

The utility model relates to a cylinder body inner wall polishing mechanism for a hydraulic oil cylinder. A supporting assembly is arranged on the working platform, grinding assemblies are further symmetrically arranged on the working platform, the supporting assembly comprises a supporting frame, a supporting groove, a driving air cylinder, a driving support, a driving motor, a driving wheel, a driving sleeve, a plurality of supporting air cylinders, a supporting support and a supporting wheel, and extension lines of the supporting air cylinders in the telescopic direction intersect on the axis of the supporting groove. The grinding assembly comprises a grinding support, a telescopic air cylinder, a plurality of grinding plates and a grinding piece, the telescopic direction of the telescopic air cylinder is collinear with the axis of the supporting groove, the extending direction of each grinding plate is parallel to the axis of the supporting groove, and the driving wheel and the driving sleeve are driven by the driving motor to drive the oil cylinder to rotate. All the polishing pieces extend into the rotating oil cylinder to polish the inner wall of the oil cylinder through driving of the telescopic air cylinder to the polishing support. The device is ingenious in structure, convenient and practical.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic oil cylinder inner wall grinding, in particular to a cylinder inner wall grinding mechanism for a hydraulic oil cylinder. Background Art

[0002] A hydraulic cylinder is a mechanical component that works on the principle of hydraulics and is widely used in engineering machinery, industrial equipment, automobile manufacturing and other fields. It uses the pressure of hydraulic oil to achieve the transmission of thrust or pull, thereby driving the movement of mechanical parts. The hydraulic cylinder is mainly composed of a cylinder body, a piston, a piston rod, a seal, an end cover, a buffer device and a guide sleeve. The operating principle of the hydraulic cylinder is that when hydraulic oil is pumped into the cylinder, the oil pressure pushes the piston to move, thereby achieving linear motion of the mechanical parts. Hydraulic cylinders can be designed as single-acting or double-acting. Single-acting cylinders usually require external force to return the piston, while double-acting cylinders can be pushed by hydraulic oil in both directions.

[0003] When the existing hydraulic cylinder is installed and used, the outer wall and the inner wall of the cylinder body need to be polished. When the inner wall of the cylinder body is manually polished, due to the limited internal space, there will be positions on the inner wall of the cylinder that cannot be polished, and the quality and efficiency of manual polishing are low, which greatly affects the later use of the hydraulic cylinder and is very inconvenient. Utility Model Content

[0004] The utility model aims to provide a cylinder inner wall grinding mechanism for a hydraulic oil cylinder, which has an ingenious structure and can realize comprehensive and efficient grinding of the cylinder inner wall without any grinding dead angles, thereby improving the grinding efficiency and also ensuring the stability, practicality, efficiency and convenience of the hydraulic oil cylinder in the later stage.

[0005] The technical solution for achieving the purpose of the utility model is as follows: the utility model has a working platform; a supporting assembly is provided on the working platform for the oil cylinder to pass through and rotate, and a grinding assembly is also symmetrically provided on the working platform for grinding the inner wall of the oil cylinder, and two grinding assemblies are located on both sides of the supporting assembly, and the supporting assembly includes a supporting frame, a supporting groove arranged on the supporting frame and for the oil cylinder to pass through, a driving cylinder fixed in the supporting groove, a driving bracket fixed at the telescopic end of the driving cylinder, a driving motor fixed on the driving bracket, a driving wheel rotatably arranged on the driving bracket under the drive of the driving motor, a driving sleeve mounted on the driving wheel, a plurality of supporting cylinders distributed in the supporting groove along the circumference of the axis of the supporting groove, a supporting bracket fixed at the telescopic end of the supporting cylinder, and a supporting bracket rotatably arranged on the supporting bracket The support wheel and the axes of each driving wheel are arranged parallel to the axes of the support wheel and the support groove, and the extension lines of the telescopic directions of each supporting cylinder intersect on the axes of the support groove. The grinding assembly includes a bottom bracket arranged on the working platform, a telescopic cylinder fixed on the grinding bracket, a grinding bracket fixed on the telescopic cylinder, a plurality of grinding plates distributed on the grinding bracket along the circumference of the axis of the grinding bracket, and a grinding sheet fixed on each grinding plate. The telescopic direction of the telescopic cylinder is arranged colinearly with the axis of the support groove, and the extension direction of each grinding plate is arranged parallel to the axis of the support groove. The driving wheel and the driving sleeve drive the oil cylinder to rotate through the drive of the driving motor, and each grinding sheet extends into the rotating oil cylinder through the drive of the grinding bracket by the telescopic cylinder to grind the inner wall of the oil cylinder.

[0006] Furthermore, the above-mentioned polishing bracket is provided with a telescopic slide groove coaxially arranged with the polishing bracket, and the bottom of the telescopic slide groove is provided with multiple cylinder groups corresponding to each polishing plate, each cylinder group is composed of two polishing cylinders, one end of each polishing cylinder is fixed on the bottom of the telescopic slide groove, and the other end of each polishing cylinder is fixed on the polishing plate, and each polishing plate is telescopically arranged in the telescopic slide groove through the drive of the corresponding polishing cylinder.

[0007] Furthermore, the above-mentioned grinding bracket is provided with a dust suction chamber, and the dust suction chamber is provided with multiple dust suction pumps corresponding to each grinding plate, and each grinding plate is provided with multiple dust suction grooves. Each grinding plate is provided with a dust collection channel and a dust exhaust channel corresponding to each dust suction groove. One end of each dust collection channel is connected with the corresponding dust suction groove, and the other end of each dust collection channel is connected to the dust exhaust channel. The bottom of the telescopic slide is provided with dust suction holes corresponding to each dust suction pump, and a dust suction pipe is provided between each grinding plate and the bottom of the telescopic slide, and the two ends of each dust suction pipe are respectively connected with the dust suction hole and the dust exhaust channel, and the dust suction groove on each grinding plate is driven by the dust suction pump to suck the debris generated by grinding into the dust suction chamber, and an openable chamber door is provided on the end of each grinding bracket away from the telescopic cylinder.

[0008] Furthermore, an auxiliary pressing assembly for auxiliary supporting the oil cylinder is provided between each grinding assembly and the supporting assembly, and the auxiliary pressing assembly includes an auxiliary cylinder arranged on the working platform, an auxiliary platform fixed on the auxiliary cylinder, an auxiliary slide rail fixed on the auxiliary platform, two auxiliary sliding blocks slidably arranged on the auxiliary slide rails, an auxiliary bracket fixed on each auxiliary sliding block, and an auxiliary wheel rotatably arranged on each auxiliary bracket, the extension direction of each auxiliary slide rail is perpendicular to the axis of the supporting groove, and the axis of each auxiliary wheel is parallel to the axis of the supporting wheel, and the side wall of the auxiliary slide rail is provided with a plurality of locking holes evenly distributed along the extension direction of the auxiliary slide rail, the auxiliary slide rail is provided with an adjusting groove, a locking rod is slidingly provided in the adjusting groove, a reset spring is sleeved on the locking rod, and two ends of the reset spring act on the locking rod and the adjusting groove respectively, and the auxiliary slide rail is slidably connected to the auxiliary slide rail and is fixed by the plug-in cooperation of the locking rod and the locking hole.

[0009] Furthermore, the above-mentioned working platform is provided with a first bottom rail which is arranged opposite to and parallel to the axis of the supporting groove, and the bottom of each bottom bracket is provided with a first sliding block corresponding to each first bottom rail. The working platform is also provided with a first cylinder corresponding to each bottom bracket, and the telescopic end of each first cylinder is fixed on the bottom bracket. The bottom bracket is set on the working platform by the drive of each first cylinder and the cooperation and sliding of the first sliding block and the first bottom rail. The working platform is also provided with a second bottom rail which is arranged opposite to and parallel to the first bottom rail, and the bottom of each auxiliary cylinder is provided with a second sliding block corresponding to the second bottom rail. The working platform is also provided with a second cylinder corresponding to each auxiliary cylinder, and the telescopic end of each second cylinder is fixed on the auxiliary cylinder. The auxiliary cylinder is set on the working platform by the drive of the second cylinder and the cooperation and sliding of the second bottom rail and the second sliding block.

[0010] The utility model has positive effects: (1) the utility model sets a support assembly on the working platform, each driving cylinder drives the driving bracket, and the driving motor drives the driving wheel and the driving sleeve to drive the rod body to roll, and the driving sleeve drives the cylinder body to rotate by the friction between the outer wall of the cylinder body and the driving cylinder. Each supporting wheel supports the rod body by driving the supporting cylinder and can assist the rod body to rotate. The support assembly can be suitable for cylinders with different outer diameters, and can stably press the outer wall of the cylinder body according to the cylinders with different outer diameters to avoid the cylinder body from shaking during the grinding process. Both sides of the cylinder body are A grinding mechanism is provided, and each grinding mechanism extends into the inner wall of the cylinder body to grind the inner wall of the cylinder body through the driving of the grinding bracket by the telescopic cylinder, which effectively solves the problem of insufficient grinding of the inner wall of the cylinder body in the prior art. The inner wall of the rotating cylinder body is polished by the grinding sheets on multiple grinding plates, so that the high efficiency of the grinding of the inner wall of the cylinder body is achieved, which greatly improves the grinding quality and grinding efficiency of the inner wall of the cylinder body, and also ensures the comprehensiveness of the grinding of the inner wall of the cylinder body. In addition, grinding components are arranged on both sides, and the inner wall of the cylinder body is polished at the same time, which further ensures the balance of the cylinder body during grinding, and is stable and practical.

[0011] (2) The utility model provides a telescopic slide groove on the grinding bracket, and provides a plurality of grinding cylinders on the telescopic slide groove. Each grinding cylinder drives the grinding plate and the grinding sheet to expand outward, so as to fit with the inner wall of the cylinder body and grind the inner wall of the cylinder body. The grinding cylinder drives the grinding plate to be suitable for cylinder bodies with various inner diameters, so as to comprehensively and efficiently grind the inner wall of the cylinder body, and has good adjustability and applicability.

[0012] (3) The utility model provides a dust suction chamber, and the dust suction pump in the dust suction chamber is driven to suck the debris and powder generated during the grinding process into the dust suction chamber through the dust suction groove, the dust collection channel and the dust exhaust channel. On the one hand, it can greatly ensure the cleanliness of the inner wall of the cylinder body, and on the other hand, it can also uniformly recover and uniformly process the generated debris, thereby ensuring the cleanliness of the entire grinding mechanism, convenience and practicality.

[0013] (4) The utility model sets an auxiliary pressure assembly, and the auxiliary cylinder drives the auxiliary platform to rise and fall. The auxiliary slider and the auxiliary slide rail cooperate with each other, and the locking rod and the locking hole cooperate to adjust the position of the auxiliary wheel. On the one hand, it can be suitable for cylinders with various outer diameters. On the other hand, by setting two auxiliary pressure assemblies, the balance of the cylinder can be further ensured, and the stability of the cylinder during the grinding process can be ensured, which is efficient and convenient.

[0014] (5) The utility model sets a first cylinder, and the bottom bracket is driven by the first cylinder and the first bottom rail and the first slider are used to adjust the horizontal position. The second cylinder drives the auxiliary cylinder and the second bottom rail and the second slider are used to adjust the horizontal position of each auxiliary wheel. This can ensure the high efficiency of the grinding bracket when entering and exiting the cylinder body, and can also adjust the horizontal position according to cylinder bodies of different lengths. It has strong applicability and is efficient and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to specific embodiments and in conjunction with the accompanying drawings.

[0016] Figure 1 It is a schematic diagram of the overall structure of the cylinder inner wall grinding mechanism for the hydraulic cylinder in the utility model;

[0017] Figure 2 It is a cross-sectional view of the overall structure of the support assembly in the utility model;

[0018] Figure 3 It is a cross-sectional view of the overall structure of the grinding assembly in the utility model;

[0019] Figure 4 It is a cross-sectional view of the overall structure of the grinding plate in the utility model;

[0020] Figure 5 It is a schematic diagram of the overall structure of the auxiliary pressing component in the utility model;

[0021] Figure 6 It is a cross-sectional view of the connection structure between the auxiliary slider and the locking rod in the utility model. DETAILED DESCRIPTION

[0022] See Figures 1 to 6The utility model has a working platform 1; a supporting assembly 2 through which an oil cylinder can pass and rotate is provided on the working platform 1; a grinding assembly 3 for grinding the inner wall of the oil cylinder is symmetrically provided on the working platform 1; two grinding assemblies 3 are located on both sides of the supporting assembly 2; the supporting assembly 2 includes a supporting frame 21, a supporting groove 22 arranged on the supporting frame 21 and through which the oil cylinder can pass, a driving cylinder 23 fixed in the supporting groove 22, a driving bracket 24 fixed at the telescopic end of the driving cylinder 23, a driving motor 20 fixed on the driving bracket 24, a driving wheel 25 rotatably arranged on the driving bracket 24 under the drive of the driving motor 20, a driving sleeve 26 sleeved on the driving wheel 25, a plurality of supporting cylinders 27 distributed in the supporting groove 22 along the circumference of the axis of the supporting groove 22, a supporting bracket 28 fixed at the telescopic end of the supporting cylinder 27, and a supporting wheel 29 rotatably arranged on the supporting bracket 28, each driving The axis of the wheel 25 is arranged parallel to the axis of the supporting wheel 29, and is also arranged parallel to the axis of the supporting groove 22. The extension lines of the telescopic directions of each supporting cylinder 27 intersect on the axis of the supporting groove 22. The grinding assembly 3 includes a bottom bracket 31 arranged on the working platform 1, a telescopic cylinder 32 fixed on the grinding bracket 33, a grinding bracket 33 fixed on the telescopic cylinder 32, a plurality of grinding plates 34 distributed on the grinding bracket 33 along the axis of the grinding bracket 33, and a grinding sheet 35 fixed on each grinding plate 34. The telescopic direction of the telescopic cylinder 32 is arranged colinearly with the axis of the supporting groove 22, and the extension direction of each grinding plate 34 is arranged parallel to the axis of the supporting groove 22. The driving wheel 25 and the driving sleeve 26 drive the oil cylinder to rotate through the drive motor 20, and each grinding sheet 35 extends into the rotating oil cylinder through the drive of the grinding bracket 33 by the telescopic cylinder 32 to grind the inner wall of the oil cylinder.

[0023] The polishing bracket 33 is provided with a telescopic slide groove 37 coaxially arranged with the polishing bracket 33. The bottom of the telescopic slide groove 37 is provided with multiple cylinder groups corresponding to each polishing plate 34. Each cylinder group is composed of two polishing cylinders 36. One end of each polishing cylinder 36 is fixed to the bottom of the telescopic slide groove 37, and the other end of each polishing cylinder 36 is fixed to the polishing plate 34. Each polishing plate 34 is telescopically arranged in the telescopic slide groove 37 through the drive of the corresponding polishing cylinder 36.

[0024] The grinding bracket 33 is provided with a dust suction chamber 38, and the dust suction chamber 38 is provided with a plurality of dust suction pumps 381 corresponding to each grinding plate 34, and each grinding plate 34 is provided with a plurality of dust suction grooves 341, and each grinding plate 34 is provided with a dust collection channel 342 and a dust exhaust channel 343 corresponding to each dust suction groove 341, and one end of each dust collection channel 342 is connected to the corresponding dust suction groove 341, and the other end of each dust collection channel 342 is connected to the dust exhaust channel 343. The bottom of the telescopic slide 37 is provided with dust suction holes 331 corresponding to each dust suction pump 381, and a dust suction pipe 39 is provided between each grinding plate 34 and the bottom of the telescopic slide 37. The two ends of each dust suction pipe 39 are respectively connected with the dust suction hole 331 and the dust exhaust channel 343. The dust suction groove 341 on each grinding plate 34 is driven by the dust suction pump 381 to suck the debris generated by grinding into the dust suction chamber 38, and an openable chamber door 30 is provided on the end of each grinding bracket 33 away from the telescopic cylinder 32.

[0025] An auxiliary pressing assembly 4 for auxiliary support of the oil cylinder is arranged between each grinding assembly 3 and the supporting assembly 2, and the auxiliary pressing assembly 4 comprises an auxiliary cylinder 41 arranged on the working platform 1, an auxiliary platform 42 fixed on the auxiliary cylinder 41, an auxiliary slide rail 43 fixed on the auxiliary platform 42, two auxiliary sliders 44 slidably arranged on the auxiliary slide rails 43, an auxiliary bracket 45 fixed on each auxiliary slider 44, and an auxiliary wheel 46 rotatably arranged on each auxiliary bracket 45, and the extension direction of each auxiliary slide rail 43 is perpendicular to the axis of the supporting groove 22. The auxiliary wheels 46 are arranged in parallel with the axis of the supporting wheel 29, the side wall of the auxiliary rail 43 is provided with a plurality of locking holes 431 evenly distributed along the extension direction of the auxiliary rail 43, the auxiliary slider 44 is provided with an adjusting groove 441, a locking rod 443 is slidably provided in the adjusting groove 441, a reset spring 442 is sleeved on the locking rod 443, and both ends of the reset spring 442 act on the locking rod 443 and the adjusting groove 441 respectively, the auxiliary slider 44 is slidably connected to the auxiliary rail 43 and is fixed by the plug-in cooperation of the locking rod 443 and the locking hole 431.

[0026] The working platform 1 is provided with a first bottom rail 12 which is arranged opposite to and parallel to the axis of the supporting groove 22, and a first slider 13 corresponding to each first bottom rail 12 is provided at the bottom of each bottom bracket 31, and a first cylinder 11 corresponding to each bottom bracket 31 is also provided on the working platform 1, and a telescopic end of each first cylinder 11 is fixed on the bottom bracket 31, and the bottom bracket 31 is arranged on the working platform 1 by the driving of each first cylinder 11 and the cooperation and sliding of the first slider 13 and the first bottom rail 12, and a second bottom rail 15 which is arranged opposite to and parallel to the first bottom rail 12 is also provided on the working platform 1, and a second slider 16 corresponding to the second bottom rail 15 is provided at the bottom of each auxiliary cylinder 41, and a second cylinder 14 corresponding to each auxiliary cylinder 41 is also provided on the working platform 1, and a telescopic end of each second cylinder 14 is fixed on the auxiliary cylinder 41, and the auxiliary cylinder 41 is arranged on the working platform 1 by the driving of the second cylinder 14 and the cooperation and sliding of the second bottom rail 15 and the second slider 16.

[0027] Working principle of the utility model: during the use of the utility model, the hydraulic cylinder is first placed in the support groove 22 of the support frame 21, and each support wheel 29 in the support groove 22 is pressed against the outer wall of the cylinder body by the driving of the support frame 28 by the support cylinder 27, and each auxiliary wheel 46 is horizontally adjusted by the driving of the auxiliary cylinder 41 by the second cylinder 14, the cooperation of the second bottom rail 15 and the second slider 16, and then the auxiliary platform 42 is driven by the auxiliary cylinder 41, and the cooperation of the auxiliary slide rail 43 and the auxiliary slider 44 is adjusted according to the actual outer diameter of the cylinder body. After the adjustment is completed, it is fixed by the plug-in cooperation of the locking rod 443 and the locking hole 431, and each auxiliary wheel 46 is pressed against the outer wall of the cylinder body of the cylinder, and the driving cylinder 23 drives the driving frame 24 to rise, and the driving wheel 25 on the driving frame 24 drives the cylinder body of the cylinder to rotate by the driving motor 20, and each bottom bracket 31 is driven by the first cylinder 11 and the second bottom bracket 31 is driven by the second cylinder 11 and the second bottom bracket 31 is driven by the second cylinder 11 and the second bottom bracket 31 is driven by the second bottom bracket 31. The cooperation of the bottom rail 12 and the first slider 13 drives the grinding bracket 33 to press against the cylinder body, and then the telescopic cylinder 32 drives the grinding bracket 33 to extend into the cylinder body. After the grinding bracket 33 extends into the cylinder body, each grinding cylinder 36 drives the grinding plate 34 and the grinding sheet 35 on the grinding plate 34 to press against the inner wall of the cylinder body, thereby grinding the inner wall of the rotating cylinder body. While grinding, the telescopic cylinder 32 drives the grinding bracket 33 to continue to penetrate into the inner wall of the cylinder body, thereby achieving comprehensive grinding of the inner wall of the cylinder body. At the same time, the debris generated by grinding is sucked into the dust suction chamber 38 by the drive of the dust suction pump 381 in the dust suction chamber 38, and after the grinding is completed, the debris is poured out by opening the chamber door 30, which effectively solves the problems of low grinding efficiency, poor quality and incomplete grinding caused by manual grinding in the prior art, effectively guarantees the efficiency and quality of grinding the inner wall of the cylinder body, effectively guarantees the comprehensive grinding of the inner wall of the cylinder body, and also lays the foundation for the later use of the oil cylinder, with ingenious structure, high efficiency and convenience.

[0028] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The inner wall grinding mechanism for the hydraulic cylinder has a working platform; its characteristics are: The working platform is provided with a supporting assembly through which the oil cylinder can pass and rotate, and the working platform is also symmetrically provided with grinding assemblies that can grind the inner wall of the oil cylinder, and the two grinding assemblies are located on both sides of the supporting assembly, and the supporting assembly includes a supporting frame, a supporting groove arranged on the supporting frame and through which the oil cylinder can pass, a driving cylinder fixed in the supporting groove, a driving bracket fixed at the telescopic end of the driving cylinder, a driving motor fixed on the driving bracket, a driving wheel rotatably arranged on the driving bracket under the drive of the driving motor, a driving sleeve mounted on the driving wheel, a plurality of supporting cylinders distributed in the supporting groove along the circumference of the axis of the supporting groove, a supporting bracket fixed at the telescopic end of the supporting cylinder, and a supporting wheel rotatably arranged on the supporting bracket, and the axis of each driving wheel is aligned with the supporting bracket. The axes of the support wheels are arranged in parallel and are all arranged in parallel with the axes of the support grooves. The extension lines of the telescopic directions of the support cylinders intersect on the axes of the support grooves. The grinding assembly includes a bottom bracket arranged on the working platform, a telescopic cylinder fixed on the grinding bracket, a grinding bracket fixed on the telescopic cylinder, a plurality of grinding plates distributed on the grinding bracket along the circumference of the axis of the grinding bracket, and a grinding sheet fixed on each grinding plate. The telescopic direction of the telescopic cylinder is arranged colinearly with the axis of the support groove, and the extension direction of each grinding plate is arranged parallel to the axis of the support groove. The driving wheel and the driving sleeve drive the oil cylinder to rotate through the drive of the driving motor, and each grinding sheet extends into the rotating oil cylinder through the drive of the grinding bracket by the telescopic cylinder to grind the inner wall of the oil cylinder.

2. The inner wall grinding mechanism for a hydraulic cylinder according to claim 1, characterized in that: The polishing bracket is provided with a telescopic slide groove coaxially arranged with the polishing bracket, and the bottom of the telescopic slide groove is provided with multiple groups of cylinder groups corresponding to each polishing plate, each cylinder group is composed of two polishing cylinders, one end of each polishing cylinder is fixed on the bottom of the telescopic slide groove, and the other end of each polishing cylinder is fixed on the polishing plate, and each polishing plate is telescopically arranged in the telescopic slide groove through the drive of the corresponding polishing cylinder.

3. The inner wall grinding mechanism for a hydraulic cylinder according to claim 2, characterized in that: A dust suction chamber is provided in the grinding bracket, and a plurality of dust suction pumps corresponding to each grinding plate are provided in the dust suction chamber, and a plurality of dust suction grooves are provided on each grinding plate. A dust collecting channel and a dust exhaust channel corresponding to each dust suction groove are provided in each grinding plate, one end of each dust collecting channel is connected with the corresponding dust suction groove, and the other end of each dust collecting channel is connected to the dust exhaust channel. A dust suction hole corresponding to each dust suction pump is provided at the bottom of the telescopic slide groove, and a dust suction pipe is provided between each grinding plate and the bottom of the telescopic slide groove, and the two ends of each dust suction pipe are respectively connected with the dust suction hole and the dust exhaust channel, and the dust suction groove on each grinding plate sucks the debris generated by grinding into the dust suction chamber through the drive of the dust suction pump, and an openable chamber door is provided at the end of each grinding bracket away from the telescopic cylinder.

4. The inner wall grinding mechanism for a hydraulic cylinder according to claim 3, characterized in that: The auxiliary pressing assembly for auxiliary supporting the oil cylinder is provided between each grinding assembly and the supporting assembly. The auxiliary pressing assembly includes an auxiliary cylinder arranged on the working platform, an auxiliary platform fixed on the auxiliary cylinder, an auxiliary slide rail fixed on the auxiliary platform, two auxiliary sliding blocks slidably arranged on the auxiliary slide rails, an auxiliary bracket fixed on each auxiliary sliding block, and an auxiliary wheel rotatably arranged on each auxiliary bracket. The extension direction of each auxiliary slide rail is perpendicular to the axis of the supporting groove, and the axis of each auxiliary wheel is parallel to the axis of the supporting wheel. The side wall of the auxiliary slide rail is provided with a plurality of locking holes evenly distributed along the extension direction of the auxiliary slide rail. The auxiliary slide rail is provided with an adjusting groove, a locking rod is slidingly provided in the adjusting groove, a reset spring is sleeved on the locking rod, and two ends of the reset spring act on the locking rod and the adjusting groove respectively. The auxiliary slide rail is slidably connected to the auxiliary slide rail and is fixed by plugging and fitting the locking rod and the locking hole.

5. The inner wall grinding mechanism for a hydraulic cylinder according to claim 4, characterized in that: The working platform is provided with a first bottom rail which is arranged opposite to and parallel to the axis of the supporting groove, and the bottom of each bottom bracket is provided with a first sliding block corresponding to each first bottom rail. The working platform is also provided with a first cylinder corresponding to each bottom bracket, and the telescopic end of each first cylinder is fixed on the bottom bracket. The bottom bracket is set on the working platform by the drive of each first cylinder and the cooperation and sliding of the first sliding block and the first bottom rail. The working platform is also provided with a second bottom rail which is arranged opposite to and parallel to the first bottom rail, and the bottom of each auxiliary cylinder is provided with a second sliding block corresponding to the second bottom rail. The working platform is also provided with a second cylinder corresponding to each auxiliary cylinder, and the telescopic end of each second cylinder is fixed on the auxiliary cylinder. The auxiliary cylinder is set on the working platform by the drive of the second cylinder and the cooperation and sliding of the second bottom rail and the second sliding block.

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