A grinding machine for the inner wall of a hydraulic prop cylinder

Abstract

The present application relates to the technical field of metal polishing equipment, and specifically discloses a polishing machine for the inner wall of a mine hydraulic prop cylinder, which comprises a supporting frame and further comprises: a polishing mechanism fixedly installed on the top of the supporting frame; a fixing mechanism fixedly installed on the polishing mechanism; wherein the polishing mechanism comprises a protective pipe fixedly installed on the supporting frame, the top of the protective pipe is fixedly connected with a connecting disc, the edge upper surface of the connecting disc is fixedly connected with four connecting rods, and the top of each connecting rod is fixedly connected with a mounting disc. The present application can automatically fit the inner wall of the cylinder during polishing, can match cylinder production with different inner diameters, and can make the polishing plate and the inner wall of the cylinder as a whole in elastic air pressure fitting, so as to protect the equipment itself during polishing and avoid the problem that the traditional rigid fitting can easily damage the equipment.

Description

Technical Field

[0001] This invention relates to the field of metal grinding equipment technology, specifically a grinding machine for the inner wall of a mining hydraulic support cylinder. Background Technology

[0002] Mine hydraulic props are core equipment for roof support in fully mechanized coal mining faces. They provide stable support to the roof through the relative movement of the cylinder and piston, directly impacting the safety and efficiency of coal mining operations. In the manufacturing and maintenance of hydraulic props, grinding the inner wall of the cylinder is a crucial process for restoring or ensuring its surface smoothness, reducing frictional resistance, and extending the service life of the seals. Because the cylinder of mine hydraulic props is typically made of thick-walled seamless steel pipe with varying inner diameters (commonly ranging from Φ63mm to Φ400mm), and the inner wall of the cylinder often has defects such as rust, scratches, and wear steps after use, it needs to be repaired through grinding.

[0003] Existing grinding equipment for the inner wall of mining hydraulic support cylinders still has the following shortcomings in practical applications: First, traditional equipment mostly uses grinding wheels or grinding heads of fixed sizes for grinding. When processing cylinders with different inner diameters, it is necessary to change to grinding tools of corresponding specifications. This not only increases the types of spare parts and changeover time, but also the contact pressure between the fixed-size grinding tool and the inner wall of the cylinder is rigidly set, lacking a mechanism to automatically adjust the contact force according to changes in the inner diameter. It is difficult to ensure the fit between the grinding tool and the cylinder wall during the grinding process, which can easily cause local over-grinding or under-grinding, affecting the consistency of repair quality. Second, if the metal powder on the inner wall of the cylinder cannot be discharged in time during the grinding process, it will accumulate in the contact area between the grinding tool and the cylinder wall. With the rotation of the grinding tool, this metal powder is equivalent to forming rolling abrasive grains on the cylinder wall surface, causing secondary scratches and abrasions on the already polished surface, seriously reducing the grinding quality. Traditional equipment generally lacks a structural design for simultaneously collecting or discharging metal powder during the grinding process. This often requires machine shutdown for cleaning or reliance on manual blowing with compressed air, impacting efficiency and increasing dust pollution in the working environment. Thirdly, the clamping and fixing of the cylinder before grinding is mostly manual. Operators must use wrenches to tighten the clamps or bolts to fix the cylinder to the fixture and manually adjust its centering position to ensure the grinding head is coaxial with the cylinder. This process is time-consuming and highly dependent on operator experience. If the centering deviation is too large, uneven grinding will occur on one side of the cylinder's inner wall after grinding, affecting the sealing accuracy and service life of the hydraulic support. Fourthly, traditional rigid grinding heads lack elastic buffering capacity when encountering local high points or areas of uneven hardness on the cylinder's inner wall, easily generating impact vibrations that can cause the grinding head to crack or the cylinder wall to develop grooves. Simultaneously, rigid contact accelerates wear on the grinding wheel, leading to frequent maintenance. In addition, most existing grinding equipment lacks external auxiliary positioning and adaptive clamping functions for the cylinder body, making it difficult to achieve rapid and continuous production in large-scale cylinder body repair operations, which restricts the overall efficiency of coal mine equipment maintenance. Summary of the Invention

[0004] (a) Technical problems to be solved This invention provides a grinding machine for the inner wall of a hydraulic support cylinder in mining, which solves the problems mentioned in the background art.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a grinding machine for the inner wall of a mining hydraulic support cylinder, comprising a support frame and further comprising: a grinding mechanism fixedly installed on the top of the support frame; a fixing mechanism fixedly installed on the grinding mechanism; wherein the grinding mechanism comprises a protective tube fixedly installed on the support frame, a connecting plate fixedly connected to the top of the protective tube, four connecting rods fixedly connected to the upper edge of the connecting plate, and an mounting plate fixedly connected to the top of the connecting rods; a motor fixedly installed in the middle of the support frame, wherein the motor is located inside the protective tube, a drive rod rotatably connected to the output end of the motor, the top of the drive rod rotatably connected through and to the upper surface of the middle of the mounting plate, wherein an mounting column is fixedly connected to the top of the drive rod, and a grinding plate is provided on the outer side of the mounting column, wherein the grinding plate is arc-shaped.

[0006] According to one embodiment of the present invention, a rotating disk is rotatably connected to the bottom surface of the mounting disk, and a rotating cover is rotatably fastened to the bottom surface of the rotating disk. The rotating cover is fixedly sleeved on the outer surface of the drive rod. A first partition plate is fixedly connected to the inner surface of the rotating cover, and a second partition plate is fixedly connected to the bottom surface of the rotating disk. The first partition plate and the second partition plate are initially arranged perpendicular to each other.

[0007] According to one embodiment of the present invention, an annular groove is provided inside the mounting column, and a telescopic plate is fixedly embedded on the outer surface of the mounting column. A connecting plate is fixedly connected to the outer end of the telescopic plate, wherein the annular groove communicates with the internal cavity of the rotating cover, and the internal cavity of the telescopic plate communicates with the annular groove.

[0008] According to one embodiment of the present invention, an mounting plate is fixedly connected to the inner surface of the grinding plate, and a groove is provided on the side of the mounting plate away from the grinding plate. A sliding column is elastically slidably installed in the groove, and the inner side of the sliding column is fixedly connected to the outer surface of the middle part of the connecting plate, wherein the outer surface of the connecting plate is slidably attached to the inner surface of the mounting plate.

[0009] According to one embodiment of the present invention, the grinding plate is symmetrically fixedly connected to both ends with baffles, and the baffles are also fixedly connected to the outer surfaces of both sides of the mounting plate. An air pressure chamber is formed on the inner surface of the grinding plate, wherein the air pressure chamber is connected to the internal cavity of the slide groove. An air outlet is formed through the interior of the grinding plate, wherein the middle part of the air outlet is connected to the air pressure chamber. A collection groove is formed on the outer surface of the grinding plate, the collection groove is arranged in a near-herringbone shape, wherein the top of the collection groove is connected to the air pressure chamber, and the bottom of the collection groove is connected to the air outlet.

[0010] According to one embodiment of the present invention, the fixing mechanism includes a connecting frame, which is fixedly installed on the top of the support frame, and the inner end of the connecting frame is fixedly connected to the side surface of the mounting plate, and the connecting frame and the mounting plate are configured to share the same central axis.

[0011] According to one embodiment of the present invention, four movable slots are provided on the connecting frame at fixed intervals around the circumference. A threaded rod is rotatably connected in the movable slot. A movable seat is threadedly connected to the outer surface of the threaded rod. The movable seat is slidably disposed in the movable slot. A covering plate is fixedly installed on the upper surface of the movable seat. The covering plate is arc-shaped, and an elastic telescopic ring is fixedly connected through the top of the covering plate. The four covering plates are combined into a ring shape by the telescopic ring.

[0012] According to one embodiment of the present invention, four gearboxes are fixedly connected to the side surface of the connecting frame, the end of the threaded rod is rotatably connected to the output end of the gearbox, and a magnetic ring is rotatably connected to the input end of the gearbox, wherein the magnetic ring is magnetically attracted to the input end of the gearbox.

[0013] According to one embodiment of the present invention, a transmission belt is rotatably connected to the outer surface of the magnetic ring, and a transition ring is rotatably connected to the end of the transmission belt away from the magnetic ring. The transition ring is rotatably sleeved on the outer surface of the connecting rod, and the transition ring is also rotatably connected to the outer surface of the rotating cover.

[0014] The equipment is fixedly installed using a support bracket. Then, the cylinder body with its opening facing down is fitted onto the outside of the grinding plate and fixed. The motor is then started. The motor starts, which drives the drive rod to rotate, thereby causing the mounting column to rotate. After the mounting column rotates, it drives the grinding plate to rotate via a telescopic plate to grind the inner wall of the cylinder.

[0015] (III) Beneficial Effects This invention provides a grinding machine for the inner wall of a hydraulic support cylinder in mining. It has the following beneficial effects: (I) The grinding machine for the inner wall of the cylinder of this mining hydraulic support, when the motor starts and drives the drive rod to rotate, will simultaneously drive the rotating cover to rotate. That is, the rotating cover initially rotates relative to the rotating disk, which causes the first partition to rotate counterclockwise and move closer to the second partition. At this time, the inner cavity of the rotating cover is compressed, thereby increasing the air pressure and sending the air pressure to the annular groove, which finally connects to the telescopic plate, causing the telescopic plate to expand outward, thereby pushing the mounting plate and the grinding plate to move outward as a whole. Finally, the outer surface of the grinding plate is put into contact with the inner wall of the cylinder for grinding. When the inner cavity of the rotating cover can no longer be compressed, it will drive the rotating disk to overcome the friction and rotate synchronously with it, thereby achieving automatic contact with the inner wall of the cylinder during grinding. This not only allows the equipment to be matched with cylinders of different inner diameters, but also ensures that the grinding plate and the inner wall of the cylinder are in elastic air pressure contact, thereby protecting the equipment itself during grinding and avoiding the problem of easy damage to the equipment caused by traditional rigid contact.

[0016] (II) The grinding machine for the inner wall of the cylinder of this mining hydraulic support gradually smooths the inner wall of the cylinder due to friction during the grinding process. That is, a lot of metal powder is generated in the initial grinding process. The metal powder fills the air pressure chamber and the cavity between the baffle and the grinding plate when the grinding plate passes by. At the same time, the telescopic plate and the connecting plate are directly connected. That is, in the initial stage, due to the lack of smoothness of the inner wall of the cylinder, the connecting plate is irregularly and intermittently misaligned by the sliding column and the mounting plate, which squeezes the cavity of the sliding groove and then transports the cavity inside to the air pressure chamber of the inner wall of the grinding plate. This causes the air pressure chamber to release air pressure to the collection groove and the air outlet, and finally releases the metal powder through the bottom of the baffle. This realizes the automatic cleaning of the metal powder produced by grinding by its own friction during grinding, avoiding the problem of secondary scratching of the inner wall of the cylinder caused by the inability to export metal powder in traditional grinding equipment. At the same time, the metal powder is always released through the bottom, which also facilitates unified collection and treatment.

[0017] (III) The grinding machine for the inner wall of the hydraulic support cylinder of this mine, when the rotating cover rotates, will drive the adapter ring to rotate, thereby driving the transmission belt to rotate. The rotation of the transmission belt will drive the magnetic ring to rotate. Initially, the magnetic ring rotates together with the input end of the gearbox, which in turn causes the threaded rod to rotate. The rotation of the threaded rod will cause the four covering plates to contract. Finally, the four covering plates will be squeezed and contracted on the outer wall of the cylinder. When the squeezing pressure is sufficient and cannot continue to contract, the magnetic ring will rotate relative to the input end of the gearbox. This will enable the cylinder to be automatically centered and fixed before grinding, in conjunction with the synchronously expanding grinding plate. This will greatly improve the automation level of this equipment. Unlike traditional grinding equipment, it does not require frequent manual adjustment, which greatly improves the ease of use of the equipment. Moreover, the cylinder can be quickly removed when the motor reverses, allowing the equipment to work quickly and continuously without stopping, which greatly improves production efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the coating plate of the present invention; Figure 3 This is a schematic diagram of the installation disk of the present invention; Figure 4 This is a schematic diagram of the structure of the grinding plate of the present invention; Figure 5 This is a schematic diagram of the mounting column of the present invention; Figure 6 This is a schematic diagram of the mounting plate of the present invention; Figure 7 This is a schematic diagram of the rotating disk of the present invention; Figure 8 This is a schematic diagram of the rotating cover of the present invention.

[0019] In the diagram: 1. Support frame; 2. Grinding mechanism; 21. Protective tube; 22. Connecting plate; 23. Connecting rod; 24. Mounting plate; 25. Motor; 26. Drive rod; 27. Mounting column; 28. Grinding plate; 29. ​​Rotating plate; 210. Rotating cover; 211. Partition No. 1; 212. Partition No. 2; 213. Ring groove; 214. Telescopic plate; 215. Connecting plate; 216. Mounting plate; 217. Sliding groove; 218. Sliding column; 219. Stop bar; 220. Air pressure chamber; 221. Air outlet; 222. Collection groove; 3. Fixing mechanism; 31. Connecting frame; 32. Moving groove; 33. Threaded rod; 34. Moving seat; 35. Covering plate; 36. Elastic telescopic ring; 37. Gearbox; 38. Magnetic ring; 39. Transmission belt; 310. Adapter ring. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] First embodiment: as follows Figures 1 to 8 As shown, the present invention provides a technical solution: a grinding machine for the inner wall of a mining hydraulic support cylinder, including a support frame 1, and further comprising: Grinding mechanism 2 is fixedly installed on the top of support frame 1; Fixing mechanism 3 is fixedly installed on grinding mechanism 2; The grinding mechanism 2 includes a protective tube 21, which is fixedly installed on the support frame 1. A connecting plate 22 is fixedly connected to the top of the protective tube 21. Four connecting rods 23 are fixedly connected to the upper surface of the edge of the connecting plate 22. A mounting plate 24 is fixedly connected to the top of the connecting rods 23. A motor 25 is fixedly installed in the middle of the support frame 1. The motor 25 is located inside the protective tube 21. The output end of the motor 25 is rotatably connected to a drive rod 26. The top of the drive rod 26 is rotatably connected to the upper surface of the middle part of the mounting plate 24. The top of the drive rod 26 is fixedly connected to a mounting post 27. A grinding plate 28 is provided on the outside of the mounting post 27. The grinding plate 28 is arc-shaped.

[0022] The bottom surface of the mounting plate 24 is rotatably connected to the rotating plate 29, and the bottom surface of the rotating plate 29 is rotatably fastened to the rotating cover 210, which is fixedly sleeved on the outer surface of the drive rod 26. A first partition 211 is fixedly connected to the inner surface of the rotating cover 210, and a second partition 212 is fixedly connected to the bottom surface of the rotating disk 29. The first partition 211 and the second partition 212 are initially set perpendicular to each other.

[0023] An annular groove 213 is provided inside the mounting column 27, and a telescopic plate 214 is fixedly installed on the outer surface of the mounting column 27. A connecting plate 215 is fixedly connected to the outer end of the telescopic plate 214. The annular groove 213 communicates with the internal cavity of the rotating cover 210, and the internal cavity of the telescopic plate 214 communicates with the annular groove 213.

[0024] A mounting plate 216 is fixedly connected to the inner surface of the grinding plate 28. A groove 217 is provided on the side of the mounting plate 216 away from the grinding plate 28. A sliding column 218 is elastically slidably installed in the groove 217. The inner side of the sliding column 218 is fixedly connected to the outer surface of the middle part of the connecting plate 215. The outer surface of the connecting plate 215 is slidably attached to the inner surface of the mounting plate 216.

[0025] The grinding plate 28 is symmetrically fixedly connected to two ends of the baffle strip 219, which is also fixedly connected to the outer surfaces of both sides of the mounting plate 216. The inner surface of the grinding plate 28 is provided with a pneumatic cavity 220, which is connected to the internal cavity of the slide groove 217. The interior of the grinding plate 28 is provided with a through-hole 221, wherein the middle part of the through-hole 221 is connected to the air pressure chamber 220. A collection groove 222 is provided on the outer surface of the grinding plate 28. The collection groove 222 is arranged in a near-V shape. The top of the collection groove 222 is connected to the air pressure chamber 220, and the bottom of the collection groove 222 is connected to the air outlet 221.

[0026] Second embodiment: as follows Figures 1 to 8 As shown, the fixing mechanism 3 includes a connecting frame 31, which is fixedly installed on the top of the support frame 1. At the same time, the inner end of the connecting frame 31 is fixedly connected to the side surface of the mounting plate 24, and the connecting frame 31 and the mounting plate 24 are set to the same central axis.

[0027] The connecting frame 31 has four movable slots 32 with a fixed circumferential spacing. A threaded rod 33 is rotatably connected in the movable slot 32. A movable seat 34 is threadedly connected to the outer surface of the threaded rod 33. The movable seat 34 is slidably disposed in the movable slot 32. A covering plate 35 is fixedly installed on the upper surface of the movable seat 34. The covering plate 35 is arc-shaped, and an elastic telescopic ring 36 is fixedly connected through the top of the covering plate 35. The four covering plates 35 are combined into a ring shape by the telescopic ring.

[0028] Four gearboxes 37 are fixedly connected to the side surface of the connecting frame 31. The end of the threaded rod 33 is rotatably connected to the output end of the gearbox 37. A magnetic ring 38 is rotatably connected to the input end of the gearbox 37, wherein the magnetic ring 38 is magnetically attracted to the input end of the gearbox 37.

[0029] A transmission belt 39 is rotatably connected to the outer surface of the magnetic ring 38. A transition ring 310 is rotatably connected to the end of the transmission belt 39 away from the magnetic ring 38. The transition ring 310 is rotatably sleeved on the outer surface of the connecting rod 23, and the transition ring 310 is also rotatably connected to the outer surface of the rotating cover 210.

[0030] During operation, the equipment is fixedly installed using the support bracket 1. Then, the cylinder body, with its opening facing downwards, is fitted onto the outside of the grinding plate 28 and fixed. The motor 25 is then started. The motor 25 drives the drive rod 26 to rotate, which in turn causes the mounting column 27 to rotate. The rotation of the mounting column 27, via the telescopic plate 214, drives the grinding plate 28 to rotate, grinding the inner wall of the cylinder. Simultaneously, when the motor 25 starts and drives the drive rod 26 to rotate, it also drives the rotating cover 210 to rotate. Initially, the rotating cover 210 rotates relative to the rotating disk 29, causing the first partition plate 211 to rotate counterclockwise and approach the second partition plate 212. At this time, the inner cavity of the rotating cover 210 is compressed, increasing the air pressure and delivering it to the annular groove 213, ultimately connecting to the telescopic plate 214, causing the telescopic plate 214 to move outwards. The expansion pushes the mounting plate 216 and the grinding plate 28 outwards, ultimately causing the outer surface of the grinding plate 28 to adhere to the inner wall of the cylinder for grinding. When the inner cavity of the rotating cover 210 can no longer be compressed, it will drive the rotating disk 29 to overcome friction and rotate synchronously with it, thus achieving automatic adhesion to the inner wall of the cylinder during grinding. This not only allows the equipment to be compatible with the production of cylinders with different inner diameters, but also ensures that the grinding plate 28 and the inner wall of the cylinder are in an elastic air pressure fit, thereby protecting the equipment itself during grinding and avoiding the problem of easy damage caused by traditional rigid adhesion. During the grinding process, the inner wall of the cylinder will gradually become smooth due to friction. That is, the initial grinding process will produce a lot of metal powder, which will fill the gap as the grinding plate 28 passes. The air is filled into the air pressure chamber 220 and the cavity between the baffle 219 and the grinding plate 28. At the same time, the telescopic plate 214 is directly connected to the connecting plate 215. Initially, due to the unevenness of the inner wall of the cylinder, the connecting plate 215 intermittently rotates and misaligns with the mounting plate 216 via the sliding column 218, thereby compressing the cavity of the sliding groove 217. This compresses the cavity and transports the internal cavity to the air pressure chamber 220 on the inner wall of the grinding plate 28. The air pressure chamber 220 then releases air pressure into the collection groove 222 and the air outlet 221, ultimately releasing the metal powder through the bottom of the baffle 219. This achieves automatic cleaning of the metal powder produced during grinding using its own friction, avoiding the problem of secondary scratching of the inner wall of the cylinder caused by the inability to remove metal powder in traditional grinding equipment. Meanwhile, the metal powder is always released through the bottom, which facilitates unified collection and processing. When the rotating cover 210 rotates, it drives the adapter ring 310 to rotate, which in turn drives the transmission belt 39. The rotation of the transmission belt 39 drives the magnetic ring 38 to rotate. Initially, the magnetic ring 38 rotates together with the input end of the gearbox 37, causing the threaded rod 33 to rotate. The rotation of the threaded rod 33 causes the four covering plates 35 to contract. Finally, the four covering plates 35 are compressed and contracted against the outer wall of the cylinder. When the compressive force is sufficient and further contraction is impossible, the magnetic ring 38 rotates relative to the input end of the gearbox 37. This allows the cylinder to be automatically centered and fixed before grinding, in conjunction with the synchronously expanding grinding plate 28, significantly improving the automation level of the equipment.Unlike traditional grinding equipment, this machine eliminates the need for frequent manual adjustments, significantly improving ease of use. Furthermore, the cylinder can be quickly removed by reversing the motor at 25°, allowing for rapid, continuous, and uninterrupted operation, greatly enhancing production efficiency.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A grinding machine for the inner wall of a hydraulic support cylinder in mining, comprising a support frame, characterized in that: Also includes: A grinding mechanism, which is fixedly installed on the top of the support frame; A fixing mechanism is fixedly installed on the grinding mechanism; The grinding mechanism includes a protective tube, which is fixedly installed on a support frame. A connecting plate is fixedly connected to the top of the protective tube. Four connecting rods are fixedly connected to the upper surface of the edge of the connecting plate, and a mounting plate is fixedly connected to the top of the connecting rods. A motor is fixedly installed in the middle of the support frame, and the motor is located inside the protective tube. The output end of the motor is rotatably connected to a drive rod. The top of the drive rod is rotatably connected to the upper surface of the middle part of the mounting plate. A mounting column is fixedly connected to the top of the drive rod. A grinding plate is provided on the outside of the mounting column. The grinding plate is arc-shaped.

2. A grinding machine for the inner wall of a mining hydraulic support cylinder according to claim 1, characterized in that: The bottom surface of the mounting plate is rotatably connected to a rotating plate, and the bottom surface of the rotating plate is rotatably fastened with a rotating cover, which is fixedly sleeved on the outer surface of the drive rod. The inner surface of the rotating cover is fixedly connected to a first partition plate, and the bottom surface of the rotating disk is fixedly connected to a second partition plate, wherein the first partition plate and the second partition plate are initially set perpendicular to each other.

3. A grinding machine for the inner wall of a mining hydraulic support cylinder according to claim 2, characterized in that: The mounting column has an annular groove inside, and a telescopic plate is fixedly embedded on the outer surface of the mounting column. A connecting plate is fixedly connected to the outer end of the telescopic plate. The annular groove communicates with the internal cavity of the rotating cover, and the internal cavity of the telescopic plate communicates with the annular groove.

4. A grinding machine for the inner wall of a mining hydraulic support cylinder according to claim 3, characterized in that: An mounting plate is fixedly connected to the inner surface of the grinding plate. A groove is provided on the side of the mounting plate away from the grinding plate. A sliding column is elastically slidably installed in the groove. The inner side of the sliding column is fixedly connected to the outer surface of the middle part of the connecting plate. The outer surface of the connecting plate is slidably attached to the inner surface of the mounting plate.

5. A grinding machine for the inner wall of a mining hydraulic support cylinder according to claim 4, characterized in that: The grinding plate has symmetrically fixed baffles at both ends, and the baffles are also fixedly fixed to the outer surfaces of both sides of the mounting plate. The inner surface of the grinding plate has an air pressure chamber, which is connected to the internal cavity of the slide groove. The grinding plate has a through-hole for air venting, and the middle part of the air vent is connected to the air pressure chamber. The outer surface of the grinding plate is provided with a collection groove, which is arranged in a near-herringbone shape. The top of the collection groove is connected to the air pressure chamber, and the bottom of the collection groove is connected to the air outlet.

6. A grinding machine for the inner wall of a mining hydraulic support cylinder according to claim 5, characterized in that: The fixing mechanism includes a connecting frame, which is fixedly installed on the top of the support frame. The inner end of the connecting frame is fixedly connected to the side surface of the mounting plate, and the connecting frame and the mounting plate are set to the same central axis.

7. A grinding machine for the inner wall of a mining hydraulic support cylinder according to claim 6, characterized in that: The connecting frame has four movable slots at fixed intervals around its circumference. A threaded rod is rotatably connected in each movable slot. A movable seat is threadedly connected to the outer surface of the threaded rod. The movable seat is slidably disposed in the movable slot. A covering plate is fixedly installed on the upper surface of the movable seat. The covering plate is arc-shaped, and an elastic telescopic ring is fixedly connected through the top of the covering plate. The four covering plates are combined into a ring shape by the telescopic ring.

8. A grinding machine for the inner wall of a mining hydraulic support cylinder according to claim 7, characterized in that: Four gearboxes are fixedly connected to the side surface of the connecting frame. The end of the threaded rod is rotatably connected to the output end of the gearbox. A magnetic ring is rotatably connected to the input end of the gearbox, and the magnetic ring is magnetically attracted to the input end of the gearbox.

9. A grinding machine for the inner wall of a mining hydraulic support cylinder according to claim 8, characterized in that: A transmission belt is rotatably connected to the outer surface of the magnetic ring. A transition ring is rotatably connected to the end of the transmission belt away from the magnetic ring. The transition ring is rotatably sleeved on the outer surface of the connecting rod and is also rotatably connected to the outer surface of the rotating cover.

Images