A compact belt drive numerical control belt sander

Abstract

The application discloses a compact type sand belt transmission numerical control sand belt machine, which comprises a sand belt and a sand belt transmission device for driving the sand belt to move, wherein the sand belt transmission device comprises a driving wheel, a driven wheel, a tensioning sand belt wheel and a compacting sand belt wheel; the compacting sand belt wheel compacts the sand belt to the outer surface of the driving wheel; the sand belt surface of the sand belt is compactly attached to the outer surface of the driving wheel; and the sand belt moves under the driving of the driving wheel while the driving wheel rotates. The sand belt is arranged outside a soft rubber shaft; the shape of the sand belt and the soft rubber shaft is deformed along with the shape of an irregularly shaped workpiece and is fully contacted with the irregularly shaped workpiece, so that the grinding and polishing of the irregularly shaped workpiece are completed. Since the sand belt surface is rough, the friction with the driving wheel is increased, so that the driving force of the driving wheel to the sand belt is increased; the tensioning sand belt wheel only needs to gently straighten the sand belt, and the sand belt does not need to be pulled too tightly; the sand belt is closely attached to the irregularly shaped part of the special-shaped workpiece through the soft rubber shaft, and a more ideal effect is obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polishing equipment, and particularly relates to a pressurized sand belt transmission numerical control sand belt machine. BACKGROUND

[0002] The sand belt machine is a commonly used grinding and polishing equipment, which is widely used in workpiece grinding and forming. The sand belt machine plays an irreplaceable role in the metal processing industry, and the sand belt polishing equipment is usually applied to the metal processing procedures such as surface polishing, circular polishing, finishing polishing and grinding, radius polishing, chamfering and deburring.

[0003] The sand belt machine is driven by a driving wheel and a driven wheel through sand belt tensioning to realize power output. During grinding, the sand belt needs to obtain high output power and is generally pulled tightly. In the published patent document CN214771128U, a device for enhancing transmission power by sand belt friction is used to increase the friction between the sand belt and the driving wheel by making the sand belt pass outside the driving wheel. If the sand belt is not pulled tightly enough, the driving wheel and the sand belt will slip, affecting the rotation of the sand belt. If the sand belt is pulled too tightly, the rubber shaft used as the driven wheel will lose elasticity due to compression, so it cannot use a softer rubber shaft on the driven wheel.

[0004] However, for irregularly shaped products, it is necessary to deform the soft rubber shaft externally to achieve the purpose of grinding and polishing the special-shaped parts. Since the driven wheel cannot use a soft rubber shaft, it is impossible to grind and polish special-shaped parts. SUMMARY

[0005] Therefore, it is necessary to provide a pressurized sand belt transmission numerical control sand belt machine which can use a soft rubber shaft to grind special-shaped parts without tensioning the sand belt.

[0006] A pressurized sand belt transmission numerical control sand belt machine, comprising a fixed mounting frame, a workpiece grinding device, a sand belt and a sand belt transmission device for driving the sand belt to rotate, the sand belt transmission device comprising a driving wheel, a driven wheel, a tensioning sand belt wheel and a pressurized sand belt wheel, the tensioning sand belt wheel being used to adjust the tightness of the sand belt, and the pressurized sand belt wheel being used to press the sand belt onto the surface of the driving wheel so that the driving wheel drives the sand belt to rotate; the workpiece grinding device comprising a soft rubber shaft, the sand belt being arranged outside the soft rubber shaft and rotating along the outside of the soft rubber shaft, the sand belt being tightly attached to the outside of the soft rubber shaft, the shape of the soft rubber shaft being deformed according to the shape of the irregularly shaped workpiece and being tightly attached to the irregularly shaped workpiece, so that the sand belt can grind and polish the irregularly shaped workpiece.

[0007] Preferably, the sand belt is connected end to end to form a closed sand belt ring, the sand belt comprises a sand belt surface and a back surface opposite to the sand belt surface, the sand belt surface is the outer side of the sand belt ring; the sand belt ring is arranged around the surfaces of the driving wheel, the driven wheel and the tensioning sand belt wheel, the driven wheel, the tensioning sand belt wheel and the pressing sand belt wheel act on the inner side of the sand belt ring, the driving wheel acts on the outer side of the sand belt ring, and the surface of the driving wheel is in close contact with the sand belt surface of the sand belt.

[0008] Preferably, the pressing sand belt wheel and the driven wheel are arranged on the same side of the driving wheel, the sand belt passes through the gap between the pressing sand belt wheel and the driving wheel and then successively winds around the driving wheel and the driven wheel; the contact surface of the pressing sand belt wheel and the driving wheel is deviated to the left of the vertical direction of the axis of the driving wheel by a predetermined angle, the vertical direction of the axis of the driven wheel is deviated to the right of the vertical direction of the axis of the driving wheel by a predetermined angle, and the contact area between the sand belt and the driving wheel depends on the distance between the driven wheel and the pressing sand belt wheel, so that the driven wheel is as close as possible to the pressing sand belt wheel to maximize the contact area between the sand belt and the driving wheel and increase the friction between the driving wheel and the sand belt.

[0009] Preferably, the pressing sand belt wheel comprises a fixed support, a movable support, a push-pull cylinder and an axle, the pressing sand belt wheel is installed on the fixed mounting frame through the fixed support, and the axle is arranged on one side of the driving wheel and presses the sand belt on the driving wheel.

[0010] Preferably, the axle comprises a first shaft core, a steel shaft and a rubber shaft, the steel shaft is rotatably sleeved on the outside of the first shaft core, the rubber shaft is sleeved on the outside of the steel shaft, and the rubber shaft and the steel shaft are in interference fit.

[0011] Preferably, the two ends of the first shaft core are fixedly connected to the movable support, the push-pull cylinder has a movable rod, the top end of the movable rod is fixedly connected to the movable support, and the movable rod of the push-pull cylinder drives the movable rod and the axle to move.

[0012] Preferably, the tensioning sand belt wheel comprises a second shaft core, and the sand belt transmission device further comprises a tensioning wheel rotating slide plate, a slide plate rotating shaft and a slide plate adjusting cylinder, one end of the tensioning wheel rotating slide plate is connected to the second shaft core, the other end of the tensioning wheel rotating slide plate is connected to the slide plate rotating shaft, the slide plate adjusting cylinder is arranged below the tensioning wheel rotating slide plate and close to one end of the tensioning sand belt wheel, the slide plate adjusting cylinder changes the inclination of the tensioning wheel rotating slide plate through the extension and contraction of the cylinder top rod, adjusts the height of the tensioning sand belt wheel, and thus adjusts the tightness of the sand belt.

[0013] Preferably, the workpiece grinding device comprises a grinding head frame, and the soft rubber shaft is mounted on the grinding head frame through a bearing seat.

[0014] Preferably, a workpiece moving device is further included, which is arranged below the workpiece grinding device and is used for grinding a workpiece to be processed placed on the workpiece moving device, and the workpiece moving device comprises a moving mechanism and a workpiece jig, the moving mechanism comprises a lifting module and a horizontal moving module, the horizontal moving module is arranged above the lifting module, the workpiece jig is arranged above the horizontal moving module, and the lifting module and the horizontal moving module drive the workpiece jig to move in a processing space.

[0015] Preferably, an electrically controlled magnetic table is arranged above the horizontal moving module, the workpiece jig is arranged on the electrically controlled magnetic table and is opened and closed under the control of the electrically controlled magnetic table to clamp the workpiece to be processed.

[0016] In the above-mentioned pressurized abrasive belt transmission numerical control abrasive belt machine, the driving wheel and the driven wheel drive the abrasive belt to rotate, the tensioning abrasive belt wheel is used for adjusting the tightness of the abrasive belt, the pressurized abrasive belt wheel presses the abrasive belt against the outer surface of the driving wheel, the abrasive belt sanding surface is pressed and combined with the outer surface of the driving wheel, and the abrasive belt sanding surface is wound on the outer surface of the driving wheel. When the driving wheel rotates, the abrasive belt rotates under the driving of the driving wheel to polish the workpiece to be processed. For the groove or inner corner of the irregularly shaped workpiece surface, the abrasive belt is wound on the outer surface of the soft rubber shaft, and the shapes of the abrasive belt and the soft rubber shaft are deformed along the shape of the irregularly shaped workpiece, so that the abrasive belt is in full contact with the irregularly shaped workpiece, and the grinding and polishing of the irregularly shaped workpiece are completed. Because the abrasive belt sanding surface is rough, the friction with the driving wheel is increased, so that the driving force of the driving wheel on the abrasive belt is increased. Therefore, the tensioning abrasive belt wheel only needs to straighten the abrasive belt slightly, and does not need to be pulled too tightly. In the grinding process, the abrasive belt can be combined with the shape of the irregularly shaped workpiece through the soft rubber shaft, and a more ideal effect can be polished. The structure of the present application is simple, easy to realize, low in cost and convenient to popularize. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic diagram of the pressurized abrasive belt transmission numerical control abrasive belt machine of the embodiment of the present application.

[0018] Figure 2 is a front view of the pressurized abrasive belt transmission numerical control abrasive belt machine of the embodiment of the present application.

[0019] Figure 3Fig. 1 is a structural schematic diagram of a pressing sand belt wheel of a pressing sand belt transmission numerical control sand belt machine according to an embodiment of the present application.

[0020] Figure 4 Fig. 2 is a top view of the pressing sand belt wheel of the pressing sand belt transmission numerical control sand belt machine according to the embodiment of the present application.

[0021] Figure 5 Fig. 3 is a sectional view of the pressing sand belt wheel of the pressing sand belt transmission numerical control sand belt machine according to the embodiment of the present application. DETAILED DESCRIPTION

[0022] The embodiment of the present application takes the pressing sand belt transmission numerical control sand belt machine as an example, and the present application will be described in detail below in combination with specific embodiments and drawings.

[0023] Please refer to Figure 1 and Figure 2 , which show a pressing sand belt transmission numerical control sand belt machine 100 provided by an embodiment of the present application, which comprises a fixed mounting frame 10, a workpiece moving device 20, a workpiece grinding device 30, a sand belt 40, and a sand belt transmission device 50 for driving the sand belt 40 to rotate. The workpiece moving device 20 is arranged below the workpiece grinding device 30. The workpiece grinding device 30 is used for grinding a workpiece 200 to be processed placed on the workpiece moving device 20. The sand belt transmission device 50 comprises a driving wheel 51, a driven wheel 52, a tensioning sand belt wheel 53, and a pressing sand belt wheel 54. The tensioning sand belt wheel 53 is used for adjusting the tightness of the sand belt 40. The pressing sand belt wheel 54 presses the sand belt 40 onto the surface of the driving wheel 51, so that the driving wheel 51 drives the sand belt 40 to rotate. The workpiece grinding device 30 comprises a soft rubber shaft 32. The sand belt 40 is arranged outside the soft rubber shaft 32 and rotates along the outside of the soft rubber shaft 32. The sand belt 40 is tightly attached to the outside of the soft rubber shaft 32. The shape of the soft rubber shaft 32 deforms along with the shape of an irregularly shaped workpiece and is tightly attached to the irregularly shaped workpiece, so that the sand belt 40 can grind the irregularly shaped workpiece.

[0024] Specifically, the soft rubber shaft 32 is used for grinding a special-shaped workpiece with an irregular shape. The soft rubber shaft 32 has elasticity and can deform along with the special-shaped workpiece, so that the sand belt 40 outside the soft rubber shaft 32 deforms at the same time and is tightly attached to the special-shaped workpiece. The soft rubber shaft 32 is used for grinding the special-shaped workpiece, without tensioning the sand belt 40. The sand belt 40 can be pressed by the pressing sand belt wheel 54 onto the driving wheel 51 to drive the sand belt 40 to rotate, so that the sand belt 40 can be elastic during the grinding process, the grinding of the special-shaped workpiece is realized, and a good grinding effect is achieved.

[0025] Compared with the conventional technical solution of increasing the friction between the sand belt and the driving wheel by tightening the sand belt, the pressing sand belt transmission numerical control sand belt machine 100 in the technical solution is more suitable for flexible shafts, such as soft rubber shafts, flexible polishing shafts, etc. In the embodiment, the pressing sand belt wheel 54 is used to press the sand belt 40 on the driving wheel 51, so that the sand belt 40 around the soft rubber shaft 32 does not need to be tightened too much, and the soft rubber shaft 32 and the sand belt 40 are more easily attached to the special-shaped workpiece, thereby completing the polishing of the special-shaped workpiece.

[0026] The sand belt transmission device 50 and the workpiece grinding device 30 are fixedly installed on one side of the fixed mounting frame 10, and the workpiece grinding device 30 is arranged below the sand belt transmission device 50.

[0027] Preferably, the sand belt 40 is connected at the head and tail to form a closed sand belt ring, the sand belt 40 includes a sand belt surface and a back surface opposite to the sand belt surface, and the sand belt surface is the outer side surface of the sand belt ring. The sand belt ring is arranged around the surfaces of the driving wheel 51, the driven wheel 52, and the tensioning sand belt wheel 53, the driven wheel 52, the tensioning sand belt wheel 53, and the pressing sand belt wheel 54 act on the inner side of the sand belt ring, i.e., contact the back surface of the sand belt 40, and the driving wheel 51 acts on the outer side of the sand belt ring, and the surface of the driving wheel 51 is in close contact with the sand belt surface of the sand belt 40.

[0028] Preferably, the pressing sand belt wheel 54 and the driven wheel 52 are arranged on the same side of the driving wheel 51, and after the sand belt 40 passes through the gap between the pressing sand belt wheel 54 and the driving wheel 51, the sand belt 40 successively winds around the driving wheel 51 and the driven wheel 52.

[0029] Specifically, the distance between the pressing sand belt wheel 54 and the driven wheel 52 is small, and according to the winding direction of the sand belt 40, the sand belt 40 first passes through the gap between the pressing sand belt wheel 54 and the driving wheel 51, then winds around the outer surface of the driving wheel 51, and finally adjusts the rotation direction of the sand belt 40 through the driven wheel 52.

[0030] In the embodiment, the contact surface of the pressing sand belt wheel 54 and the driving wheel 51 is deviated by a predetermined angle, such as 5-30 degrees, to the left in the vertical direction of the axis of the driving wheel 51. The vertical direction of the axis of the driven wheel 52 is deviated by a predetermined angle, such as 10-30 degrees, to the right in the vertical direction of the axis of the driving wheel 51. The pressing sand belt wheel 54 and the driven wheel 52 have a spacing therebetween to avoid friction of the sand belt 40 itself during rotation.

[0031] Preferably, please refer to Figure 3 ,Figure 4 and Figure 5 , show the structure of the compression belt wheel 54, the compression belt wheel 54 includes a fixed support 541, a movable support 542, a push-pull cylinder 543 and a wheel shaft, the compression belt wheel 54 is installed on the fixed mounting frame 10 through the fixed support 541, the wheel shaft is arranged on one side of the driving wheel 51 and compresses the sand belt 40 on the driving wheel 51. The wheel shaft includes a first shaft core 544, a steel shaft 545 and a rubber shaft 546, the steel shaft 545 is rotatably sleeved on the outside of the first shaft core 544, the rubber shaft 546 is sleeved on the outside of the steel shaft 545, and the rubber shaft 546 and the steel shaft 545 are in interference fit. Both ends of the first shaft core 544 are fixedly connected to the movable support 542, the push-pull cylinder 543 has a movable rod, the top end of the movable rod is fixedly connected to the movable support 542, and the movable rod of the push-pull cylinder 543 drives the movable rod and the wheel shaft to move.

[0032] Specifically, the distance between the compression belt wheel 54 and the driven wheel 52 is close, so that the sand belt 40 is tightly wound on the outer surface of the driving wheel 51, the length of the sand belt 40 around the driving wheel 51 is increased, and the contact area between the sand belt 40 and the driving wheel 51 is increased.

[0033] The contact area between the sand belt 40 and the driving wheel 51 depends on the distance between the driven wheel 52 and the compression belt wheel 54, under the premise that the sand belt 40 does not emit friction between the driven wheel 52 and the compression belt wheel 54, the driven wheel 52 is as close as possible to the compression belt wheel 54, so that the contact area between the sand belt 40 and the driving wheel 51 is maximized, and the friction between the driving wheel 51 and the sand belt 40 is increased.

[0034] In this embodiment, from the compression position of the compression belt wheel 54 to the winding around the driven wheel 52 away from the driving wheel 51, the contact length between the sand belt 40 and the driving wheel 51 reaches at least 80% of the outer circumference length of the driving wheel 51.

[0035] Preferably, the tensioning belt wheel 53 comprises a second shaft core, the belt transmission device 50 further comprises a tensioning wheel rotating slide plate 532, a slide plate rotating shaft 531 and a slide plate adjusting cylinder 533, one end of the tensioning wheel rotating slide plate 532 is connected to the second shaft core, the other end of the tensioning wheel rotating slide plate 532 is connected to the slide plate rotating shaft 531, the slide plate adjusting cylinder 533 is arranged below the tensioning wheel rotating slide plate 532, close to one end of the tensioning belt wheel 53, the slide plate adjusting cylinder 533 changes the inclination of the tensioning wheel rotating slide plate 532 through the extension and contraction of the cylinder top rod, adjusts the height of the tensioning belt wheel 53, so as to adjust the tightness of the belt 40.

[0036] Specifically, the slide plate adjusting cylinder 533 pushes the tensioning wheel rotating slide plate 532 upward through the cylinder top rod, the tensioning wheel rotating slide plate 532 rotates around the slide plate rotating shaft 531 as the rotation axis, moves the tensioning belt wheel 53 upward, and tightens the belt 40; on the contrary, the cylinder top rod contracts, the tensioning wheel rotating slide plate 532 reversely rotates around the slide plate rotating shaft 531 as the axis, moves the tensioning belt wheel 53 downward, and loosens the belt 40.

[0037] Specifically, the belt transmission device 50 further comprises a driving motor, the driving motor is fixedly installed on the fixed mounting frame 10, and the driving motor is used to drive the driving wheel 51 to rotate, so that the driving wheel 51 rotates and drives the belt 40 to move.

[0038] Preferably, the workpiece grinding device 30 is fixedly installed on the fixed mounting frame 10. The workpiece grinding device 30 comprises a grinding head frame 31, and the soft rubber shaft 32 is installed on the grinding head frame 31 through a bearing seat.

[0039] Preferably, the workpiece moving device 20 comprises a moving mechanism and a workpiece jig 24, the moving mechanism comprises a lifting module and a horizontal moving module 22, the horizontal moving module 22 is arranged above the lifting module, the workpiece jig 24 is arranged above the horizontal moving module 22, and the lifting module and the horizontal moving module 22 drive the workpiece jig 24 to move in the machining space. An electrically controlled magnetic table 23 is arranged above the horizontal moving module 22, the workpiece jig 24 is arranged on the electrically controlled magnetic table 23 and is opened and closed under the control of the electrically controlled magnetic table 23, so as to clamp the workpiece to be processed 200.

[0040] Specifically, the lifting module comprises a movable mounting frame 21, the movable mounting frame 21 comprises a fixed component and a lifting component, the lifting component and the fixed component are connected through a slide rail, and the lifting component moves up and down along the slide rail, so that the horizontal moving module 22 and the workpiece jig 24 move synchronously.

[0041] Specifically, the horizontal moving module 22 comprises front and back moving slide plates and left and right moving slide plates, which control the horizontal movement of the workpiece fixture 24 in the X-axis direction and the Y-axis direction, and the lifting module controls the vertical movement of the workpiece fixture 24 in the Z-axis direction, so that the workpiece fixture 24 drives the workpiece 200 to move to any position in the processing space under the control of the moving mechanism.

[0042] Specifically, when polishing the outer side surface of the workpiece, the workpiece 200 is placed on the workpiece fixture 24, the workpiece fixture 24 clamps the workpiece 200, the driving motor drives the driving wheel 51 to rotate, the driving wheel 51 drives the sand belt 40 to rotate, the sand belt 40 passes through the driving wheel 51, the driven wheel 52, the tensioning sand belt wheel 53 and the soft rubber shaft 32, the slide plate adjusting cylinder 533 adjusts the position of the tensioning sand belt wheel 53 to tension the sand belt 40, so that the sand belt 40 rotates with the driving wheel 51, and the workpiece moving device 20 moves the workpiece 200 to the soft rubber shaft 32 for polishing.

[0043] When the workpiece 200 is a special-shaped workpiece with an irregular shape, the soft rubber shaft 32 is installed on the grinding head frame 31, the soft rubber shaft 32 deforms with the sand belt 40 and is attached to the surface of the special-shaped workpiece, the pressing sand belt wheel 54 presses the sand belt 40 against the outer surface of the driving wheel 51, the sand belt 40 is wound around the driving wheel 51, which increases the contact area and friction force between the sand belt 40 and the driving wheel 51, and the driving force of the driving wheel 51 on the sand belt 40 is increased when the driving wheel 51 rotates. At this time, the tensioning sand belt wheel 53 does not need to tension the sand belt 40 too much, which can ensure the rotational torque of the sand belt 40 and realize the polishing of the special-shaped workpiece.

[0044] The driving wheel 51 and the driven wheel 52 drive the sand belt 40 to move, the tensioning sand belt wheel 53 is used for adjusting the tightness of the sand belt 40, the pressing sand belt wheel 54 presses the sand belt 40 to the outer surface of the driving wheel 51, the sand belt 40 is tightly adhered to the outer surface of the driving wheel 51, the sand belt 40 is wound on the outer surface of the driving wheel 51, and the sand belt 40 is driven to rotate by the driving wheel 51 while the driving wheel 51 rotates, so as to polish the workpiece to be processed. For the groove or inner corner of the irregularly shaped workpiece surface, the sand belt 40 is wound around the outer surface of the soft rubber shaft 32, the shape of the sand belt 40 and the soft rubber shaft 32 is deformed along the shape of the irregularly shaped workpiece, so that the sand belt 40 is in full contact with the irregularly shaped workpiece, and the grinding and polishing of the irregularly shaped workpiece is completed. Because the sand belt 40 has a rough sand belt surface, the friction with the driving wheel 51 is increased, so that the driving force of the driving wheel 51 on the sand belt 40 is increased, therefore, the tensioning sand belt wheel 53 only needs to gently straighten the sand belt 40, without the need to pull it too tightly. In the grinding process, the sand belt 40 can adhere to the shape of the irregularly shaped workpiece through the soft rubber shaft 32, and a more ideal effect can be polished. The structure of the present application is simple, easy to realize, low in cost, and convenient to popularize.

[0045] It should be noted that the above only describes the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A compact belt driven numerical control belt sander comprising a fixed mounting frame, a workpiece grinding device, a sanding belt and a sanding belt driving device for driving the sanding belt to rotate, characterized in that, The sand belt transmission device comprises a driving wheel, a driven wheel, a tensioning sand belt wheel and a pressing sand belt wheel, the tensioning sand belt wheel is used for adjusting the tightness of the sand belt, and the pressing sand belt wheel presses the sand belt on the surface of the driving wheel, so that the driving wheel drives the sand belt to rotate; the workpiece grinding device comprises a soft rubber shaft, the sand belt is arranged outside the soft rubber shaft and rotates along the outer side of the soft rubber shaft, the sand belt is tightly attached to the outer side of the soft rubber shaft, the outer shape of the soft rubber shaft is deformed according to the shape of the irregularly shaped workpiece, and the soft rubber shaft is tightly attached to the irregularly shaped workpiece, so that the sand belt realizes polishing and processing of the irregularly shaped workpiece; The pressing sand belt wheel and the driven wheel are arranged on the same side of the driving wheel, the sand belt passes through the gap between the pressing sand belt wheel and the driving wheel, and then sequentially passes around the driving wheel and the driven wheel; the contact surface between the pressing sand belt wheel and the driving wheel deviates to the left of the vertical direction of the axis of the driving wheel by a predetermined angle, the vertical direction of the axis of the driven wheel deviates to the right of the vertical direction of the axis of the driving wheel by a predetermined angle, and the contact area between the sand belt and the driving wheel depends on the distance between the driven wheel and the pressing sand belt wheel, so that the driven wheel is as close as possible to the pressing sand belt wheel, the contact area between the sand belt and the driving wheel is maximized, and the friction between the driving wheel and the sand belt is increased. The sand belt is connected at the head and tail to form a closed sand belt ring, the sand belt comprises a sand belt surface and a back surface opposite to the sand belt surface, and the sand belt surface is the outer side surface of the sand belt ring; the sand belt ring is arranged around the surfaces of the driving wheel, the driven wheel and the tensioning sand belt wheel, the driven wheel, the tensioning sand belt wheel and the pressing sand belt wheel act on the inner side of the sand belt ring, and the driving wheel acts on the outer side of the sand belt ring, and the surface of the driving wheel is in close contact with the sand belt surface.

2. The compact belt-driven CNC belt sander according to claim 1, characterized in that The pressing sand belt wheel comprises a fixed support, a movable support, a push-pull cylinder and an axle, the pressing sand belt wheel is installed on the fixed mounting frame through the fixed support, and the axle is arranged on one side of the driving wheel and presses the sand belt on the driving wheel.

3. The compact belt driven CNC belt sander as claimed in claim 2, wherein, The axle comprises a first shaft core, a steel shaft and a rubber shaft, the steel shaft is rotatably sleeved outside the first shaft core, and the rubber shaft is sleeved outside the steel shaft; and the rubber shaft and the steel shaft are in interference fit.

4. The compact belt driven CNC belt sander as claimed in claim 3, wherein, The two ends of the first shaft core are fixedly connected to the movable support, the push-pull cylinder has a movable rod, the top end of the movable rod is fixedly connected to the movable support, and the movable rod of the push-pull cylinder drives the movable rod and the axle to move.

5. The compact belt driven CNC belt sander as claimed in claim 1, wherein, The tensioning sand belt wheel comprises a second shaft core, the sand belt transmission device further comprises a tensioning wheel rotating slide plate, a slide plate rotating shaft and a slide plate adjusting cylinder, one end of the tensioning wheel rotating slide plate is connected to the second shaft core, the other end of the tensioning wheel rotating slide plate is connected to the slide plate rotating shaft, the slide plate adjusting cylinder is arranged below the tensioning wheel rotating slide plate and close to one end of the tensioning sand belt wheel, the slide plate adjusting cylinder changes the inclination of the tensioning wheel rotating slide plate through the extension and contraction of a cylinder top rod, adjusts the height of the tensioning sand belt wheel, and thus adjusts the tightness of the sand belt.

6. The compact belt driven CNC belt sander as claimed in claim 1, wherein, The workpiece grinding device comprises a grinding head frame, and the soft rubber shaft is installed on the grinding head frame through a bearing seat.

7. The compact belt driven CNC belt sander as claimed in claim 1, wherein, Further comprising a workpiece moving device, the workpiece moving device is arranged below the workpiece grinding device, the workpiece grinding device is used for grinding a workpiece to be processed placed on the workpiece moving device, the workpiece moving device comprises a moving mechanism and a workpiece jig, the moving mechanism comprises a lifting module and a horizontal moving module, the horizontal moving module is arranged above the lifting module, the workpiece jig is arranged above the horizontal moving module, and the lifting module and the horizontal moving module drive the workpiece jig to move in a processing space.

8. The compact belt driven CNC belt sander as claimed in claim 7, wherein, An electric control magnetic table is arranged above the horizontal moving module, the workpiece jig is arranged on the electric control magnetic table and is opened and closed under the control of the electric control magnetic table to clamp a workpiece to be processed.

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