Belt sander

By designing a switchable first grinding device and a belt sanding machine structure that provides a space for avoidance, the problem of large space in the belt sanding machine in the prior art is solved, and flexibility and efficiency are achieved during grinding in different processes.

CN222768030UActive Publication Date: 2025-04-18XIAMEN RUSHOU INTELLIGENT TECH CO LTD
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Patent Information

Application Number
CN202421611332.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-09
Publication Date
2025-04-18
Estimated Expiration
2034-07-09

AI Technical Summary

Technical Problem

When grinding different processes, existing belt sanders need to be provided with different models of belt sanders, resulting in large space.

Method used

A belt sanding machine is designed, including a frame, a first grinding device and a second grinding device, which can be switched between the first station and the second station to provide a space for the second grinding device to grind the product.

Benefits of technology

It realizes that when grinding in different processes, there is no need to replace the belt sander, which reduces the floor space and improves the grinding efficiency and space utilization.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to a belt sander which comprises a rack, a first polishing device and a second polishing device, the rack is provided with a first station and a second station, the first polishing device can be switched between the first station and the second station, and when the first polishing device is located on the first station, the second polishing device can be switched between the first station and the second station. The first grinding device is used for grinding products, and under the condition that the first grinding device is located on the second station, the first grinding device provides an avoiding space for the second grinding device to grind the products. The belt sander can be suitable for polishing of two different working procedures, when polishing of the different working procedures is carried out, another belt sander of different models is not needed for polishing, polishing can be directly achieved in the belt sander, convenience and rapidness are achieved, and no space is needed to be occupied.
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Description

Technical Field

[0001] The utility model relates to the technical field of surface treatment equipment, in particular to a sanding machine. Background Art

[0002] A belt sander is a machine used for surface treatment. It uses a belt of sandpaper or abrasive belt to grind, polish or remove unevenness on the surface of the material through high-speed rotation. Belt sanders are widely used in metal processing, wood processing, automobile manufacturing, furniture manufacturing and other industries. Depending on the width and length of the belt and the coarseness of the abrasive, the belt sander can be used for a variety of different grinding operations such as coarse grinding, medium grinding and fine grinding. At present, when the belt sander is used for different grinding processes, different models of belt sanders are required to achieve this, which requires a large amount of floor space. Utility Model Content

[0003] In order to solve the above problems, the purpose of the utility model is to provide a sanding machine, which is used to solve the technical problem in the prior art that different types of sanding machines are needed to perform different sanding processes, which consumes a large amount of space.

[0004] The embodiment of the utility model adopts the following technical solution:

[0005] The embodiment of the utility model provides a belt sander, the belt sander comprising:

[0006] A frame having a first station and a second station;

[0007] A first grinding device, arranged on the frame;

[0008] The second grinding device is arranged on the frame,

[0009] Among them, the first grinding device can be switched between the first workstation and the second workstation. When the first grinding device is located at the first workstation, the first grinding device is used to grind the product. When the first grinding device is located at the second workstation, the first grinding device provides an avoidance space for the second grinding device to grind the product.

[0010] In some embodiments of the present application, the first grinding device includes:

[0011] A movable plate is movably arranged on the frame, and the movable plate can be moved and switched between the first station and the second station;

[0012] A first driving wheel, rotatably disposed on the moving plate;

[0013] A first driver, disposed on the moving plate, wherein an output end of the first driver is connected to the first driving wheel, and the first driver is used to drive the first driving wheel to rotate;

[0014] A first driven wheel, rotatably disposed on the moving plate;

[0015] The first abrasive belt is arranged on the first driving wheel and the first driven wheel, and moves driven by the rotation of the first driving wheel and the first driven wheel.

[0016] In some embodiments of the present application, the first grinding device further includes:

[0017] The first driving component is arranged on the frame and connected to the movable plate, and is used for driving the movable plate to move and switch between the first station and the second station.

[0018] In some embodiments of the present application, the first driving component includes:

[0019] A connecting piece connected to the movable plate;

[0020] The second driver is arranged on the frame and connected to the connecting member, and is used for driving the connecting member to drive the movable plate to move and switch between the first station and the second station.

[0021] In some embodiments of the present application, the connecting member includes:

[0022] A connecting block, connecting the moving plate and the second driver;

[0023] A linear bearing, arranged on the movable plate, having a guide groove;

[0024] A guide rod is arranged on the frame, and the guide rod passes through the guide groove so that the linear bearing can move relative to the guide rod.

[0025] In some embodiments of the present application, the first grinding device further includes:

[0026] The first tensioning wheel is adjustably arranged on the movable plate and can rotate relative to the movable plate. The first abrasive belt is arranged on the first tensioning wheel, the first driving wheel and the first driven wheel.

[0027] In some embodiments of the present application, the second grinding device includes:

[0028] A second driving wheel is rotatably arranged on the frame relative to the frame;

[0029] A second driver is arranged on the frame, and an output end of the second driver is connected to the second driving wheel;

[0030] A second tensioning wheel is adjustably arranged on the frame and can rotate relative to the frame plate;

[0031] The second abrasive belt is arranged on the second driving wheel and the second tensioning wheel, and moves driven by the second driving wheel and the second tensioning wheel.

[0032] In some embodiments of the present application, the second grinding device further includes:

[0033] A second driven wheel is disposed on the frame and is rotatable relative to the frame;

[0034] The third abrasive belt is arranged on the second driving wheel, the second driven wheel and the second tensioning wheel. The third abrasive belt moves under the driving of the second driving wheel, the second driven wheel and the second tensioning wheel.

[0035] In some embodiments of the present application, the second grinding device further includes:

[0036] A support frame has one end arranged on the frame, the second driven wheel is arranged on the support frame, and the second driven wheel is located below the second driving wheel.

[0037] In some embodiments of the present application, there are multiple first grinding devices and multiple second grinding devices, and the first grinding devices and the second grinding devices are arranged in the height direction, wherein one first grinding device and one second grinding device form a group, and in any group, the first grinding device is located above the second grinding device.

[0038] Compared with the prior art, the beneficial effects of the embodiments of the present invention are:

[0039] The belt sander of this embodiment includes a frame, a first grinding device and a second grinding device. The frame has a first station and a second station. The first grinding device can be switched between the first station and the second station. When the first grinding device is located at the first station, the first grinding device is used to grind the product. When the first grinding device is located at the second station, the first grinding device provides an avoidance space for the second grinding device to grind the product. The belt sander of this embodiment can be used for grinding of two different processes. When performing grinding of different processes, there is no need to use another belt sander of a different model for grinding. It can be directly realized in the belt sander of this embodiment, which is convenient and fast, and does not require space, greatly reducing the floor space of the belt sander, while improving the product grinding efficiency, effectively solving the technical problem that when the belt sander is used to grind different processes, different models of belt sanders need to be provided, which consumes a large amount of floor space. Moreover, in this embodiment, when the first grinding device is adjusted to the second working position, sufficient space can be left for the second grinding device to grind the product, thereby further improving the space utilization and flexibility of the belt sander. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0041] Figure 1 The utility model is a structural schematic diagram of a sanding belt machine provided by the utility model.

[0042] Figure 2 It is a structural schematic diagram of a first grinding device of a belt sander provided by the utility model.

[0043] Figure 3 It is a structural schematic diagram from another viewing angle of a first grinding device of a sanding machine provided by the utility model.

[0044] Figure 4 It is a structural schematic diagram from another viewing angle of a first grinding device of a sanding machine provided by the utility model.

[0045] Figure 5 It is a structural schematic diagram of a second grinding device of a belt sander provided by the utility model.

[0046] Figure 6 It is a structural schematic diagram from another viewing angle of a second grinding device of a belt sander provided by the utility model.

[0047] in:

[0048] 100, frame; 200, first grinding device; 210, movable plate; 220, first driving wheel; 230, first driven wheel; 240, first sanding belt; 250, first driver; 251, connecting block; 252, linear bearing; 253, guide rod; 254, first driving component; 260, first tensioning wheel; 300, second grinding device; 310, second driving wheel; 320, second driver; 330, second tensioning wheel; 340, second sanding belt; 350, second driven wheel; 360, third sanding belt; 370, support frame. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0051] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a replaceable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0052] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0053] In the related art, in the automatic belt grinding method, the shapes of some products are relatively complex, and more grinding steps are required to complete the grinding process, that is, more different types of belts are needed to complete it, and the space occupied is required to be reasonably compact.

[0054] like Figure 1-6 As shown; Figure 1 Schematic diagram of the structure of a belt sander provided by the present application. The present application provides a belt sander, the belt sander comprising:

[0055] The frame 100 has a first station and a second station;

[0056] A first grinding device 200, disposed on the frame 100; and

[0057] The second grinding device 300 is arranged on the frame 100, and the first grinding device 200 and the second grinding device 300 are arranged in height;

[0058] The first grinding device 200 can be switched between the first workstation and the second workstation. When the first grinding device 200 is located at the first workstation, the first grinding device 200 is used to grind the product. When the first grinding device 200 is located at the second workstation, the first grinding device 200 provides an avoidance space for the second grinding device 300 to grind the product.

[0059] The belt sander of this embodiment includes a frame 100, a first grinding device 200 and a second grinding device 300. The frame 100 has a first station and a second station. The first grinding device 200 can be switched between the first station and the second station. When the first grinding device 200 is located at the first station, the first grinding device 200 is used to grind the product. When the first grinding device 200 is located at the second station, the first grinding device 200 provides an avoidance space for the second grinding device 300 to grind the product. The belt sander of this embodiment can be used for grinding of two different processes. When grinding different processes, there is no need to use another belt sander of a different model for grinding. It can be directly realized in the belt sander of this embodiment, which is convenient and fast, and does not require space, greatly reducing the floor space of the belt sander, while improving the product grinding efficiency, effectively solving the technical problem that when the belt sander is used to grind different processes, different models of belt sanders need to be provided, which consumes a large floor space.

[0060] In this embodiment, when the first grinding device 200 is adjusted to the second working position, sufficient space can be left for the second grinding device 300 to grind the product, thereby further improving the space utilization and flexibility of the belt sander.

[0061] In this embodiment, the first grinding device 200 and the second grinding device 300 are arranged in a vertical arrangement, so as to further reduce the horizontal space occupied by the belt sander.

[0062] In this embodiment, the first station and the second station on the frame 100 are both arranged in the horizontal direction, and the first station and the second station are at different positions in the horizontal direction. When the first grinding device 200 is needed, the first grinding device 200 can be moved to the first station manually or by a driving component, and the first grinding device 200 is started at this time to grind the product. When the first grinding device 200 is not needed or when the second grinding device 300 is used, the first grinding device 200 can be moved to the second station manually or by a driving component, thereby avoiding the position of the second grinding device 300, so that the second grinding device 300 can perform the product grinding work.

[0063] In some embodiments of the present application, the first grinding device 200 includes:

[0064] A movable plate 210 is movably disposed on the frame 100, and the movable plate 210 can be moved and switched between the first station and the second station;

[0065] A first driving wheel 220 is rotatably disposed on the moving plate 210;

[0066] A first driver 250 is disposed on the moving plate 210, wherein an output end of the first driver 250 is connected to the first driving wheel 220, and the first driver 250 is used to drive the first driving wheel 220 to rotate;

[0067] A first driven wheel 230 is rotatably disposed on the moving plate 210;

[0068] The first sanding belt 240 is disposed on the first driving wheel 220 and the first driven wheel 230 , and moves when the first driving wheel 220 and the first driven wheel 230 rotate.

[0069] In this embodiment, the movable plate 210 can move on the frame 100, that is, switch between the first workstation and the second workstation. It can be moved manually or driven by a driving component, so that the first grinding device 200 can switch between the first workstation and the second workstation.

[0070] When the first grinding device 200 is working at the first workstation, the first driver 250 is started. The first driver 250 can be an electric motor, a motor or an engine, etc., to transfer the rotational kinetic energy to the first driving wheel 220. The first driving wheel 220 drives the first driven wheel 230 to rotate through the first grinding belt 240, so that the first grinding belt 240 moves under the drive of the first driving wheel 220 and the first driven wheel 230. The product is placed on the first grinding belt 240 for grinding, so that the product can be polished.

[0071] In some embodiments of the present application, the first grinding device 200 further includes:

[0072] The first driving component 254 is disposed on the frame 100 and connected to the moving plate 210 , and is used to drive the moving plate 210 to move and switch between the first station and the second station.

[0073] In this embodiment, the first driving component 254 can realize that the movable plate 210 can move on the frame 100, that is, switch between the first station and the second station, that is, realize that the first grinding device 200 can switch between the first station and the second station. The movement of the first grinding device 200 between the first station and the second station can be realized automatically, so that manpower and material resources can be saved and the working efficiency of the belt sander can be improved. The first driving component 254 can be an electric cylinder, a gas cylinder or an oil cylinder, etc., or it can be a component of a motor, a gear and a rack, or a motor, a screw rod and a connecting block 251 adapted to the screw rod, etc., which can realize a driving component that drives the movable plate 210 to move and switch between the first station and the second station.

[0074] In some embodiments of the present application, the first driving component 254 includes:

[0075] A connecting member connected to the moving plate 210;

[0076] The second driver 320 is disposed on the frame 100 and connected to the connecting member, and is used to drive the connecting member to drive the movable plate 210 to move and switch between the first station and the second station.

[0077] In this embodiment, the connecting member and the movable plate 210 can be connected by bolts, screws, embedding, etc., or can be fixed by welding, so that the connecting member can move synchronously with the movable plate 210. The second driver 320 can be an electric cylinder, a pneumatic cylinder or an oil cylinder, etc. The output end is connected to the connecting member, and the connecting member is directly driven by the output end to move and switch the movable plate 210 between the first station and the second station, ensuring that the movable plate 210 can stably move and switch between the first station and the second station.

[0078] In some embodiments of the present application, the connecting member includes:

[0079] A connecting block 251, connecting the moving plate 210 and the second driver 320;

[0080] A linear bearing 252, disposed on the moving plate 210, having a guide groove;

[0081] The guide rod 253 is disposed on the frame 100 , and the guide rod 253 passes through the guide groove so that the linear bearing 252 can move relative to the guide rod 253 .

[0082] In this embodiment, the connecting block 251 and the moving plate 210 may be connected by bolts, screws, embedding, etc., or may be fixed by welding, so that the connecting member can move synchronously with the moving plate 210.

[0083] The linear bearing 252 is installed on the movable plate 210 and can be fixed thereon by welding or bolts, bolt connections, etc., and has a guide groove; the guide rod 253 passes through the guide groove, and the guide groove is restricted by the guide rod 253, that is, the linear bearing 252 and the movable plate 210 are restricted by the guide rod 253 and driven by the second driver 320, so that the movable plate 210 can be stably moved and switched between the first station and the second station, and the linear bearing 252 can bear the weight of the movable plate 210 and the first driving wheel 220, the first driven wheel 230 and the first sanding belt 240, etc., thereby ensuring that the first grinding device 200 can work stably while being able to move and switch between the first station and the second station.

[0084] In some embodiments of the present application, the first grinding device 200 further includes:

[0085] The first tensioning wheel 260 is adjustably disposed on the movable plate 210 and is rotatable relative to the movable plate 210 . The first abrasive belt 240 is disposed on the first tensioning wheel 260 , the first driving wheel 220 and the first driven wheel 230 .

[0086] In this embodiment, the first tensioning wheel 260 can rotate relative to the movable plate 210, and can be moved and adjusted relative to the movable plate 210, so as to adjust the tightness of the first abrasive belt 240. By providing a slide groove or multiple grooves on the movable plate 210, and by arranging the first tensioning wheel 260 at different positions of the slide groove or on different grooves, the position of the first tensioning wheel 260 can be adjusted to adjust the tightness of the first abrasive belt 240.

[0087] In some embodiments of the present application, the second grinding device 300 includes:

[0088] A second driving wheel 310 is rotatably disposed on the frame 100;

[0089] A second driver 320 is disposed on the frame 100, and an output end of the second driver 320 is connected to the second driving wheel 310;

[0090] A second tensioning wheel 330 is adjustably disposed on the frame 100 and is rotatable relative to the frame 100;

[0091] The second sanding belt 340 is disposed on the second driving wheel 310 and the second tensioning wheel 330 , and moves driven by the second driving wheel 310 and the second tensioning wheel 330 .

[0092] In this embodiment, the second driver 320 can be an electric motor or a motor, etc., which can drive the second driving wheel 310 to rotate, and the second tensioning wheel 330 can be driven to rotate through the second abrasive belt 340. At the same time, the second driving wheel 310 and the second tensioning wheel 330 rotate, and the second abrasive belt 340 can also be moved in time, so that the product can be placed on the second abrasive belt 340 for grinding. The second abrasive belt 340 can realize another process of grinding for different products.

[0093] In this embodiment, the second tensioning wheel 330 can rotate relative to the frame 100, and can be moved and adjusted relative to the frame 100, so as to adjust the tightness of the second abrasive belt 340. By providing a slide slot or multiple slots on the frame 100, and by arranging the second tensioning wheel 330 at different positions of the slide slot or on different slots, the position of the second tensioning wheel 330 can be adjusted to adjust the tightness of the second abrasive belt 340.

[0094] In some embodiments of the present application, the second grinding device 300 further includes:

[0095] The second driven wheel 350 is disposed on the frame 100 and can rotate relative to the frame 100;

[0096] The third abrasive belt 360 is disposed on the second driving wheel 310 , the second driven wheel 350 and the second tensioning wheel 330 . The third abrasive belt 360 moves driven by the second driving wheel 310 , the second driven wheel 350 and the second tensioning wheel 330 .

[0097] In this embodiment, the second grinding device 300 can also be configured with another set of grinding process of the third sanding belt 360. By configuring the third sanding belt 360, the third sanding belt 360 is arranged on the second driving wheel 310, the second driven wheel 350 and the second tensioning wheel 330, and the third sanding belt 360 moves under the drive of the second driving wheel 310, the second driven wheel 350 and the second tensioning wheel 330. At this time, the second sanding belt 340 does not need to be configured, and the third sanding belt 360 can realize another process of grinding the product.

[0098] In some embodiments of the present application, the second grinding device 300 further includes:

[0099] One end of the support frame 370 is disposed on the frame 100 , and the second driven wheel 350 is disposed on the support frame 370 . The second driven wheel 350 is located below the second driving wheel 310 .

[0100] In this embodiment, the second driven wheel 350 can be better disposed below the second driving wheel 310 through the support frame 370, so that a portion of the third sanding belt 360 forms a vertical space for grinding the product.

[0101] In some embodiments of the present application, there are multiple first grinding devices 200 and multiple second grinding devices 300, and the first grinding devices 200 and the second grinding devices 300 are arranged in the height direction, wherein one first grinding device 200 and one second grinding device 300 form a group, and in any group, the first grinding device 200 is located above the second grinding device 300.

[0102] In this embodiment, by configuring a plurality of the first grinding devices 200 and the second grinding devices 300, and the first grinding devices 200 and the second grinding devices 300 are arranged in a height direction, it is possible to reduce the space occupied by the sanding machine while realizing multiple different grinding processes.

[0103] Moreover, the first grinding device 200 and the second grinding device 300 form a group. In any group, the first grinding device 200 is located above the second grinding device 300, so that the first grinding device 200 can achieve effective avoidance, so that each group of the second grinding device 300 and the second grinding device 300 can occupy a smaller area, thereby improving space utilization.

[0104] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0105] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A belt sander, characterized in that: The belt sander comprises: A frame having a first station and a second station; A first grinding device, disposed on the frame; and A second grinding device is arranged on the frame, wherein the first grinding device and the second grinding device are arranged in a height arrangement; Among them, the first grinding device can be switched between the first workstation and the second workstation. When the first grinding device is located at the first workstation, the first grinding device is used to grind the product. When the first grinding device is located at the second workstation, the first grinding device provides an avoidance space for the second grinding device to grind the product.

2. The belt sander according to claim 1, characterized in that: The first grinding device comprises: A movable plate is movably arranged on the frame, and the movable plate can be moved and switched between the first station and the second station; A first driving wheel, rotatably disposed on the moving plate; A first driver, disposed on the moving plate, wherein an output end of the first driver is connected to the first driving wheel, and the first driver is used to drive the first driving wheel to rotate; A first driven wheel, rotatably disposed on the moving plate; The first abrasive belt is arranged on the first driving wheel and the first driven wheel, and moves driven by the rotation of the first driving wheel and the first driven wheel.

3. The belt sander according to claim 2, characterized in that: The first grinding device also includes: The first driving component is arranged on the frame and connected to the movable plate, and is used for driving the movable plate to move and switch between the first station and the second station.

4. The belt sander according to claim 3, characterized in that: The first driving component comprises: A connecting piece connected to the movable plate; The second driver is arranged on the frame and connected to the connecting member, and is used for driving the connecting member to drive the movable plate to move and switch between the first station and the second station.

5. The belt sander according to claim 4, characterized in that: The connecting piece comprises: A connecting block, connecting the moving plate and the second driver; A linear bearing, arranged on the movable plate, having a guide groove; A guide rod is arranged on the frame, and the guide rod passes through the guide groove so that the linear bearing can move relative to the guide rod.

6. The belt sander according to claim 5, characterized in that: The first grinding device also includes: The first tensioning wheel is adjustably arranged on the movable plate and can rotate relative to the movable plate. The first abrasive belt is arranged on the first tensioning wheel, the first driving wheel and the first driven wheel.

7. The belt sander according to claim 1, characterized in that: The second grinding device comprises: A second driving wheel is rotatably arranged on the frame relative to the frame; A second driver is arranged on the frame, and an output end of the second driver is connected to the second driving wheel; A second tensioning wheel is adjustably arranged on the frame and can rotate relative to the frame plate; The second abrasive belt is arranged on the second driving wheel and the second tensioning wheel, and moves driven by the second driving wheel and the second tensioning wheel.

8. The belt sander according to claim 7, characterized in that: The second grinding device also includes: A second driven wheel is disposed on the frame and is rotatable relative to the frame; The third abrasive belt is arranged on the second driving wheel, the second driven wheel and the second tensioning wheel. The third abrasive belt moves under the driving of the second driving wheel, the second driven wheel and the second tensioning wheel.

9. The belt sander according to claim 8, characterized in that: The second grinding device also includes: A support frame has one end arranged on the frame, the second driven wheel is arranged on the support frame, and the second driven wheel is located below the second driving wheel.

10. The belt sander according to claim 1, characterized in that: There are multiple first grinding devices and multiple second grinding devices, and the first grinding devices and the second grinding devices are arranged in the height direction, wherein one first grinding device and one second grinding device form a group, and in any group, the first grinding device is located above the second grinding device.