Vertical belt sander with adjustable tension

Abstract

The tension-adjustable vertical belt sander comprises a rack, an abrasive belt, a driving roller rotationally connected to the rack and a transmission roller, the rack is connected with a rotating part, the abrasive belt is used for being stretched by the driving roller and the driving roller and driving transmission, the rack is connected with an adjusting roller, the adjusting roller is connected to the rack through a connecting part, and the adjusting roller makes contact with the abrasive belt. The connecting piece is used for driving the adjusting roller to move to adjust tension of the abrasive belt. The adjusting roller makes contact with the abrasive belt, and when the tension of the abrasive belt is insufficient or too large, the connecting piece drives the adjusting roller to move and adjust the tension of the abrasive belt, so that the situation that the abrasive belt deviates or slips due to the too small tension of the abrasive belt is reduced, the polishing efficiency is improved, and the situation that the abrasive belt breaks due to the too large tension of the abrasive belt is reduced.

Description

Technical Field

[0001] The present application relates to the field of abrasive belt machines, and in particular to a tension-adjustable vertical abrasive belt machine. Background Art

[0002] After die-casting, metal workpieces need to be removed and further polished to ensure a smooth and even surface. Vertical belt sanders are typically used for this purpose. These sanders primarily use cloth wheels, hemp wheels, flap wheels, nylon wheels, abrasive belts, and other polishing materials, and are ideal for sanding, grinding, and polishing small and medium-sized hardware parts.

[0003] Chinese patent application number CN202952142U discloses a double-headed sanding belt machine comprising two sanding belt grinding devices symmetrically arranged on a machine base. Each sanding belt grinding device includes a bearing seat, an active sanding belt wheel, and a passive sanding belt wheel. The bearing seat is fixed to the machine base, and the active sanding belt wheel is rotatably supported on the bearing seat. The active sanding belt wheel is connected to a transmission mechanism, and a retractable bracket is fixed to the bearing seat. The passive sanding belt wheel is fixed to the retractable bracket. The utility model mounts the passive sanding belt wheel on the retractable bracket. The linear motion of the retractable bracket changes the distance between the passive and active sanding belt wheels, allowing the sanding belt machine to use sanding belts of various specifications, expanding the scope of use of the sanding belt machine.

[0004] With regard to the above-mentioned related technologies, the sanding belt is prone to loosening and slipping after long-term use, requiring workers to manually adjust it continuously after slipping, which affects the workpiece grinding efficiency. Utility Model Content

[0005] In order to reduce the deviation and slipping of the sanding belt and improve the sanding efficiency, the present application provides a vertical sanding belt machine with adjustable tension.

[0006] The present application provides a tension-adjustable vertical sanding belt machine that adopts the following technical solution:

[0007] A tension-adjustable vertical sanding belt machine includes a frame, a sanding belt, an active roller and a transmission roller rotatably connected to the frame, the frame is connected to a rotating member, the rotating member is used to drive the active roller to rotate, the sanding belt is used to be stretched and driven by the active roller and the active roller, the frame is connected to an adjusting roller, the adjusting roller is connected to the frame through a connecting member, the adjusting roller is in contact with the sanding belt, and the connecting member is used to drive the adjusting roller to move and thereby adjust the tension of the sanding belt.

[0008] By adopting the above technical solution, when grinding a workpiece, the rotating member drives the active roller to rotate, and the rotation of the active roller drives the sanding belt to rotate, so that the workpiece and the sanding belt rub against each other, thereby grinding the workpiece. When in use, the adjusting roller contacts the sanding belt. When the tension of the sanding belt is insufficient or too large, the connecting member drives the adjusting roller to move and adjust the tension of the sanding belt, thereby reducing the deviation or slipping of the sanding belt due to too small sanding belt tension, improving the grinding efficiency, and reducing the breakage of the sanding belt due to excessive sanding belt tension.

[0009] Optionally, the frame is connected to a connecting cylinder, and the connecting cylinder is rotatably connected to a connecting rod, the length direction of the connecting rod is consistent with the radial direction of the connecting cylinder, the rotation axis of the connecting rod is collinear with the central axis of the connecting cylinder, the other end of the connecting rod is connected to the adjusting roller, and the connecting member is a first spring arrangement, one end of the first spring is connected to the connecting cylinder, and the other end of the first spring is connected to the connecting rod, and when the sanding belt contacts the adjusting roller, the first spring is deformed.

[0010] By adopting the above technical solution, when in use, the adjusting roller contacts the sanding belt and the first spring is deformed. When the tension of the sanding belt decreases, the first spring restores its shape and drives the adjusting roller to move, increasing the path passed by the sanding belt, so that the sanding belt is tensioned, thereby minimizing the sanding belt deviation caused by insufficient sanding belt tension and improving the grinding efficiency. When the sanding belt tension is too large, the sanding belt pushes the adjusting roller to move, thereby reducing the path passed by the sanding belt. At the same time, the first spring is deformed, thereby minimizing the sanding belt rupture caused by excessive sanding belt tension.

[0011] Optionally, the active roller and the transmission roller are spaced apart in sequence along the vertical direction, the frame is provided with a sliding groove, the length direction of the sliding groove is consistent with the vertical direction, a slider is slidably connected in the sliding groove, the transmission roller is rotatably connected to the slider, a lifting component is connected in the sliding groove, and the lifting component is used to drive the slider to slide in the vertical direction and be connected in the sliding groove.

[0012] By adopting the above technical solution, when the lengths of the sanding belts driven and transmitted by the active roller and the transmission roller are different, the slider is driven by the lifting component to slide in the vertical direction and connected to the sliding groove, driving the transmission roller to move in the vertical direction, changing the distance between the active roller and the transmission roller, so as to adapt to sanding belts of different lengths, and the transmission roller can move in the vertical direction, thereby facilitating the installation and disassembly of the sanding belt.

[0013] Optionally, the lifting assembly includes a screw and a first motor, the length direction of the screw is consistent with the vertical direction, the screw is rotatably connected in the sliding groove, the first motor is connected to the frame, the output shaft of the first motor is connected to one end of the screw, and the slider is threadedly sleeved on the screw.

[0014] By adopting the above technical solution, the first motor drives the screw to rotate, thereby driving the slider to move in the vertical direction, thereby driving the transmission roller to approach or move away from the active roller, changing the distance between the active roller and the transmission roller, thereby adapting to sanding belts of different lengths.

[0015] Optionally, the connecting rod includes a support rod and a moving rod, one end of the support rod is connected to the connecting tube, the length direction of the support rod is radially consistent with the connecting tube, one end of the support rod is slidably sleeved on the moving rod, the length direction of the moving rod is consistent with the length direction of the support rod, the center axis of the moving rod is collinear with the center axis of the support rod, the moving rod is connected to the adjusting roller at one end away from the support rod, and the moving rod is connected to a locking assembly, which is used to lock the moving rod to the support rod.

[0016] By adopting the above technical solution, the moving rod is moved along the length direction of the moving rod, and the moving rod is locked to the support rod through the locking assembly, so that the connecting rod can be extended and retracted, thereby changing the length of the connecting rod to meet the needs of different tension adjustment ranges.

[0017] Optionally, a mounting groove is provided on the circumference of the moving rod, and the length direction of the mounting groove is consistent with the radial direction of the moving rod. The locking assembly includes a second spring and a locking block. The length direction of the second spring is consistent with the radial direction of the moving rod. One end of the second spring is connected to the inner wall of the mounting groove, and the other end of the second spring is connected to the locking block. The locking block is slidably connected to the mounting groove along the length direction of the mounting groove. A number of locking holes for the locking block to pass through are provided on the circumference of the support rod, and the several locking holes are spaced apart in sequence along the length direction of the support rod.

[0018] By adopting the above technical solution, when adjusting the length of the connecting rod, the movable rod is moved along the length direction of the support rod. At the same time, the locking block is squeezed by the support rod and embedded in the installation groove, and the second spring is deformed by the squeezing. When the movable rod moves to the corresponding position, the locking block approaches the corresponding locking hole, the second spring restores its shape and pushes the locking block, and the locking block moves along the length direction of the installation slot and passes through the locking hole, so that the movable rod is stably connected to the support rod.

[0019] Optionally, the support rod is rotatably sleeved on the moving rod, and the locking block is provided with a guide surface along one circumferential side of the moving rod. The guide surface is inclined, and the guide surface facilitates the locking block to move away from the locking hole.

[0020] By adopting the above technical solution, when adjusting the length of the connecting rod, the support rod is rotated, and under the guidance of the guide surface, the locking block is away from the locking hole, thereby facilitating the movement of the movable rod.

[0021] Optionally, the frame is connected to a protective cover, which is used to cover the active roller, the transmission roller, and the abrasive belt. A through hole is opened on one side of the protective cover for the workpiece to contact the abrasive belt.

[0022] By adopting the above technical solution, when the workpiece is being ground, the protective cover is arranged on the sanding belt, and the metal debris generated during the grinding process is blocked in the protective cover, thereby reducing the situation where the metal debris splashes onto the operator.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. When grinding a workpiece, the rotating member drives the active roller to rotate, and the rotation of the active roller drives the abrasive belt to rotate, causing the workpiece to rub against the abrasive belt, thereby grinding the workpiece. When in use, the adjusting roller contacts the abrasive belt. When the tension of the abrasive belt is insufficient or too large, the connecting member drives the adjusting roller to move and adjust the tension of the abrasive belt, thereby reducing the deviation or slipping of the abrasive belt caused by too small abrasive belt tension, improving grinding efficiency, and reducing the breakage of the abrasive belt caused by too large abrasive belt tension;

[0025] 2. When in use, the adjusting roller contacts the abrasive belt and the first spring is deformed. When the tension of the abrasive belt decreases, the first spring restores its shape and drives the adjusting roller to move, increasing the path of the abrasive belt, making the abrasive belt tight, thereby minimizing the deviation of the abrasive belt caused by insufficient abrasive belt tension and improving the grinding efficiency. When the tension of the abrasive belt is too high, the abrasive belt pushes the adjusting roller to move, thereby reducing the path of the abrasive belt. At the same time, the first spring is deformed, thereby minimizing the breakage of the abrasive belt caused by excessive abrasive belt tension.

[0026] 3. The first motor drives the screw to rotate, thereby driving the slider to move in the vertical direction, thereby driving the transmission roller to move closer to or away from the active roller, changing the distance between the active roller and the transmission roller, so as to adapt to different lengths of sanding belts. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional structural diagram of this embodiment.

[0028] Figure 2 It is a three-dimensional structural diagram of this embodiment without the protective cover.

[0029] Figure 3 It is a top view of this embodiment with the protective cover hidden.

[0030] Figure 4 This embodiment Figure 3 Cross-sectional view along the AA axis.

[0031] Figure 5 This embodiment Figure 3 Cross-sectional view along the BB direction.

[0032] Figure 6 It is a left side view of this embodiment with the protective cover hidden.

[0033] Figure 7 This embodiment Figure 6 Cross-sectional view along CC direction.

[0034] Figure 8 This embodiment Figure 7 Magnified view of part D.

[0035] Explanation of the accompanying drawings: 100, frame; 110, protective cover; 111, through hole; 120, sliding groove; 130, placement groove; 140, groove; 150, second motor; 200, active roller; 300, transmission roller; 400, sanding belt; 500, adjusting roller; 600, lifting assembly; 610, screw rod; 611, slider; 620, first motor; 700, connecting cylinder; 710, annular groove; 720, circular ring; 721, fixing rod; 730, mounting plate; 740, first spring; 800, connecting rod; 810, support rod; 811, locking hole; 820, moving rod; 821, mounting groove; 900, locking assembly; 910, second spring; 920, locking block. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-8 This application is described in further detail.

[0037] The embodiment of the present application discloses a tension-adjustable vertical belt sander. Figure 1 and Figure 2 A vertical belt sander with adjustable tension includes a frame 100, a driving roller 200, a transmission roller 300, and an abrasive belt 400. Two driving rollers 200 are provided, spaced apart horizontally. A rotating member is connected to the frame 100 and disposed between the two driving rollers 200. The rotating member is used to drive the two driving rollers 200 to rotate. Two abrasive belts 400 are provided, one corresponding to each driving roller 200. Two transmission rollers 300 are provided, one corresponding to each abrasive belt 400. The driving rollers 200 and the transmission rollers 300 are spaced apart vertically. The abrasive belt 400 is stretched and driven by the driving rollers 200. The frame 100 is connected to an adjusting roller 500, which is arranged between the active roller 200 and the transmission roller 300. The adjusting roller 500 is connected to the frame 100 through a connecting piece. The adjusting roller 500 is in contact with the sanding belt 400. The connecting piece is used to drive the adjusting roller 500 to move and thereby adjust the tension of the sanding belt 400.

[0038] When the tension is too large or too small, the connecting member drives the adjusting roller 500 to adjust the tension of the sanding belt 400, thereby avoiding the sanding belt 400 from breaking due to excessive tension and reducing the sanding belt 400 from deflecting or slipping due to insufficient tension.

[0039] Reference Figure 1 and Figure 2The frame 100 is connected to two protective covers 110, which correspond to the sanding belts 400 one by one. The protective covers 110 are used to cover the sanding belts 400, and the active roller 200, the transmission roller 300, the adjustment roller 500, and the sanding belt 400 are all arranged inside the protective covers 110. A through hole 111 is opened on one side of the protective cover 110 for the workpiece to contact the sanding belt 400.

[0040] Reference Figure 3 and Figure 4 The frame 100 is connected to two lifting assemblies 600, which are used to drive the transmission rollers 300 to move in the vertical direction. The lifting assemblies 600 correspond one-to-one with the transmission rollers 300. The frame 100 is provided with two sliding slots 120, which correspond one-to-one with the lifting assemblies 600. The length direction of the sliding slots 120 is consistent with the vertical direction.

[0041] Reference Figure 4 and Figure 5 The lifting assembly 600 includes a screw rod 610 and a first motor 620. The length direction of the screw rod 610 is consistent with the vertical direction. The screw rod 610 is rotatably connected to the corresponding side inner wall of the sliding groove 120 at both ends along its length. The frame 100 also has two placement slots 130. The placement slots 130 are provided, and the placement slots 130 correspond one-to-one with the sliding groove 120. The placement slots 130 are located above the sliding groove 120 and correspond one-to-one with the first motor 620. The first motor 620 is connected to the placement slots 130. The output shaft of the first motor 620 passes through the top inner wall of the sliding groove 120 downward in the vertical direction, and the output shaft of the first motor 620 is connected to the top of the screw rod 610. A slider 611 is slidably connected in the sliding groove 120 , and the slider 611 is threadedly sleeved on the screw rod 610 . The slider 611 is slidably connected in the sliding groove 120 along the vertical direction. The slider 611 corresponds to the transmission roller 300 one by one, and the transmission roller 300 is rotatably connected to the slider 611 .

[0042] The first motor 620 drives the screw rod 610 to rotate, thereby driving the slider 611 to slide vertically and connect to the sliding groove 120, thereby driving the transmission roller 300 to move vertically to adapt to sanding belts 400 of different lengths.

[0043] Reference Figure 2 and Figure 4The top of the frame 100 is provided with a groove 140 for the second motor 150 to be inserted into. The second motor 150 is a double-ended motor. The output shaft of the second motor 150 corresponds one-to-one with the active roller 200. The output shaft of the second motor 150 is connected to the active roller 200, and the central axis of the active roller 200 is collinear with the central axis of the output shaft of the second motor 150. The output shaft of the second motor 150 is sleeved with a connecting tube 700. The central axis of the connecting tube 700 is collinear with the central axis of the output shaft of the second motor 150. The connecting tube 700 is fixedly connected to the frame 100 along one end of its length. An annular groove 710 is provided on the circumference of the connecting tube 700. The central axis of the annular groove 710 is collinear with the central axis of the connecting tube 700. A circular ring 720 is rotatably sleeved on the connecting tube 700. The circular ring 720 is embedded in the annular groove 710, and the central axis of the circular ring 720 is collinear with the central axis of the connecting tube 700.

[0044] Reference Figure 4 and Figure 6 A connecting rod 800 is connected to the circumference of the ring 720. The length direction of the connecting rod 800 is consistent with the radial direction of the ring 720. The rotation axis of the connecting rod 800 is collinear with the central axis of the connecting cylinder 700. The other end of the connecting rod 800 is connected to the adjusting roller 500, and the adjusting roller 500 is rotatably connected to the connecting rod 800.

[0045] Reference Figure 4 and Figure 5 The connecting tube 700 is fixedly sleeved with a mounting plate 730, the central axis of the mounting plate 730 is collinear with the central axis of the connecting tube 700, and the connecting piece is a first spring 740. One end of the first spring 740 is connected to the mounting plate 730, and the other end of the first spring 740 is connected to the connecting rod 800. When the sanding belt 400 contacts the adjusting roller 500, the first spring 740 is squeezed and deformed.

[0046] Reference Figure 6 and Figure 7 The connecting rod 800 is a telescopic rod and includes a support rod 810 and a movable rod 820. A fixed rod 721 is fixedly connected to the circumference of the ring 720. The length of the fixed rod 721 is radially aligned with the ring 720, and the length of the support rod 810 is aligned with the length of the fixed rod 721. The support rod 810 is rotatably mounted on the fixed rod 721 along its length, with the central axis of the support rod 810 and the central axis of the fixed rod 721 collinear. The first spring 740 is connected to the support rod 810. The other end of the support rod 810 is slidably mounted on the movable rod 820. The length of the movable rod 820 is aligned with the length of the support rod 810, and the central axis of the movable rod 820 is collinear with the central axis of the support rod 810. The movable rod 820 is L-shaped. The end of the movable rod 820 away from the support rod 810 is rotatably connected to the adjustment roller 500, which is rotatably mounted on the movable rod 820.

[0047] Reference Figure 7 and Figure 8 The movable rod 820 is connected to a locking assembly 900, which is used to lock the movable rod 820 to the support rod 810. A mounting groove 821 is provided on the circumference of the movable rod 820, and the length direction of the mounting groove 821 is radially consistent with the movable rod 820. The locking assembly 900 includes a second spring 910 and a locking block 920 connected to the mounting groove 821. The length direction of the second spring 910 is radially consistent with the movable rod 820. One end of the second spring 910 is connected to the inner wall of the mounting groove 821 along its length, and the other end of the second spring 910 is connected to one end of the locking block 920. The locking block 920 is slidably connected to the mounting groove 821 along the length direction of the mounting groove 821. A plurality of locking holes 811 for the locking blocks 920 to pass through are provided on the circumference of the support rod 810. The depth direction of the locking holes 811 is radially consistent with the support rod 810, and the plurality of locking holes 811 are distributed in sequence along the length direction of the support rod 810.

[0048] Reference Figure 5 and Figure 8 The locking block 920 is provided with a guide surface along one side of the circumference of the moving rod 820. The guide surface is provided on the side of the locking block 920 away from the second spring 910. The guide surface is inclined to facilitate the locking block 920 to move away from the locking hole 811. The support rod 810 is rotatably sleeved on the moving rod 820.

[0049] When adjusting the length of the connecting rod 800, rotate the support rod 810 so that the locking block 920 is embedded in the installation groove 821, so as to facilitate the movement of the moving rod 820. When the moving rod 820 moves to the corresponding position, the locking block 920 is close to the locking hole 811 at the corresponding position, and the second spring 910 pushes the locking block 920 through the locking hole 811, so that the moving rod 820 is stably connected to the support rod 810.

[0050] The implementation principle of a tension-adjustable vertical sanding belt machine according to an embodiment of the present application is as follows: during sanding, the second motor 150 drives the active roller 200 to rotate, thereby driving the sanding belt 400 to be transmitted, and the sanding belt 400 sands the workpiece. During use, the sanding belt 400 is pressed against the adjusting roller 500, and the first spring 740 is squeezed and deformed. When the tension of the sanding belt 400 is too low, the first spring 740 gradually recovers its shape, and the first spring 740 pushes the adjusting roller 500 to move, and the adjusting roller 500 drives the sanding belt 400 to move, thereby increasing the tension of the sanding belt 400 and avoiding as much as possible the situation where the sanding belt 400 is deflected or slipped due to too little tension. When the tension of the sanding belt 400 is too high, the sanding belt 400 pushes the adjusting roller 500 to move, thereby adjusting the tension of the sanding belt 400 and avoiding as much as possible the situation where the sanding belt 400 is broken due to too much tension.

[0051] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A vertical sanding machine with adjustable tension, comprising a frame (100), a sanding belt (400), an active roller (200) rotatably connected to the frame (100), and a transmission roller (300), wherein the frame (100) is connected to a rotating member, the rotating member is used to drive the active roller (200) to rotate, and the sanding belt (400) is used to be stretched by the active roller (200) and driven for transmission, and is characterized in that: The frame (100) is connected to an adjusting roller (500), the adjusting roller (500) being connected to the frame (100) via a connecting piece, the adjusting roller (500) being in contact with the sanding belt (400), and the connecting piece being used to drive the adjusting roller (500) to move and thereby adjust the tension of the sanding belt (400).

2. The tension-adjustable vertical belt sander according to claim 1, characterized in that: The frame (100) is connected to a connecting tube (700), and the connecting tube (700) is rotatably connected to a connecting rod (800). The length direction of the connecting rod (800) is consistent with the radial direction of the connecting tube (700), and the rotation axis of the connecting rod (800) is colinear with the central axis of the connecting tube (700). The other end of the connecting rod (800) is connected to the adjusting roller (500). The connecting member is a first spring (740). One end of the first spring (740) is connected to the connecting tube (700), and the other end of the first spring (740) is connected to the connecting rod (800). When the sanding belt (400) contacts the adjusting roller (500), the first spring (740) is deformed.

3. The tension-adjustable vertical belt sander according to claim 1, characterized in that: The active roller (200) and the transmission roller (300) are spaced apart in sequence along the vertical direction. The frame (100) is provided with a sliding groove (120). The length direction of the sliding groove (120) is consistent with the vertical direction. A slider (611) is slidably connected in the sliding groove (120). The transmission roller (300) is rotatably connected to the slider (611). A lifting component (600) is connected in the sliding groove (120). The lifting component (600) is used to drive the slider (611) to slide in the vertical direction and be connected in the sliding groove (120).

4. The tension-adjustable vertical belt sander according to claim 3, characterized in that: The lifting assembly (600) includes a screw rod (610) and a first motor (620). The length direction of the screw rod (610) is consistent with the vertical direction. The screw rod (610) is rotatably connected to the sliding groove (120). The first motor (620) is connected to the frame (100). The output shaft of the first motor (620) is connected to one end of the screw rod (610). The slider (611) is threadedly sleeved on the screw rod (610).

5. The tension-adjustable vertical belt sander according to claim 2, characterized in that: The connecting rod (800) includes a support rod (810) and a moving rod (820), one end of the support rod (810) is connected to the connecting tube (700), the length direction of the support rod (810) is consistent with the radial direction of the connecting tube (700), one end of the support rod (810) is slidably sleeved on the moving rod (820), the length direction of the moving rod (820) is consistent with the length direction of the support rod (810), the central axis of the moving rod (820) is collinear with the central axis of the support rod (810), the end of the moving rod (820) away from the support rod (810) is connected to the adjusting roller (500), and the moving rod (820) is connected to a locking assembly (900), and the locking assembly (900) is used to lock the moving rod (820) to the support rod (810).

6. The tension-adjustable vertical belt sander according to claim 5, characterized in that: The movable rod (820) is provided with a mounting groove (821) on its circumferential side, and the length direction of the mounting groove (821) is consistent with the radial direction of the movable rod (820). The locking assembly (900) includes a second spring (910) and a locking block (920). The length direction of the second spring (910) is consistent with the radial direction of the movable rod (820). One end of the second spring (910) is connected to the inner wall of the mounting groove (821), and the other end of the second spring (910) is connected to the locking block (920). The locking block (920) is slidably connected to the mounting groove (821) along the length direction of the mounting groove (821). The support rod (810) is provided with a plurality of locking holes (811) for the locking block (920) to pass through. The plurality of locking holes (811) are distributed in sequence along the length direction of the support rod (810).

7. The tension-adjustable vertical belt sander according to claim 6, characterized in that: The support rod (810) is rotatably sleeved on the moving rod (820), and the locking block (920) is provided with a guide surface along one circumferential side of the moving rod (820). The guide surface is inclined, and the guide surface facilitates the locking block (920) to move away from the locking hole (811).

8. The tension-adjustable vertical belt sander according to claim 1, characterized in that: The frame (100) is connected to a protective cover (110), which is used to cover the active roller (200), the transmission roller (300), and the abrasive belt (400). A through hole (111) for contact between a workpiece and the abrasive belt (400) is provided on one side of the protective cover (110).

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