Abrasive belt grinding machine

Abstract

The utility model relates to the field of grinding machines, in particular to an abrasive belt grinding machine which comprises a rack, at least one connecting rod assembly is arranged on the rack in a penetrating mode, the two ends of the connecting rod assembly protrude out of the rack and are fixedly provided with a grinding mechanism, the grinding mechanism comprises a first grinding assembly and a second grinding assembly, and the first grinding assembly is fixedly connected with the end of a connecting rod. The second grinding assembly is movably arranged at the top of the first grinding assembly. The first grinding assemblies are provided with first abrasive belts in a winding mode, the number of the first abrasive belts of the multiple first grinding assemblies is sequentially decreased or increased, the second grinding assemblies are provided with second abrasive belts in a winding mode, the number of the second abrasive belts of the multiple second grinding assemblies is sequentially decreased or increased, the grinding mechanisms are located on the two sides of the rack, and the gravity center of the rack is more stable; and it is ensured that the abrasive belt grinding machine has good stability. The multiple grinding mechanisms are provided with the first abrasive belts and the second abrasive belts with different mesh numbers, rough grinding and fine grinding are completed in the one-time grinding process, and the grinding efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of grinders, in particular to a belt grinder. Background Art

[0002] A belt sander is a commonly used metal processing equipment, mainly used for grinding and trimming metal, wood, plastic and other materials. It is usually driven by a motor, which drives a rotating sanding belt for grinding. A belt sander usually has an adjustable speed function, which can adjust the speed according to different workpieces and grinding requirements. It is also equipped with sanding belts of different particle sizes, and the appropriate sanding belt can be selected for grinding as needed to achieve different precision requirements. Belt sanders are widely used in metal processing, woodworking, workshop maintenance and other fields. They can deburr, trim, polish and other processes on the surface of workpieces to improve the surface quality and precision of workpieces.

[0003] Among them, the application number is CN202210058267.0, and the name is a washing machine cover sanding belt grinding workbench, which links the grinding wheel and the movement of the tension force through a linkage component to ensure the accuracy of the device. However, since there are coarse grinding and fine grinding in the grinding stage, sanding belts with different mesh sizes need to be used in different stages, resulting in the need to set up multiple workbenches with different mesh sizes, and the grinding efficiency is low. Utility Model Content

[0004] The utility model aims to provide a belt grinder, aiming to improve the problem that a conventional grinding workbench cannot meet the requirements of coarse grinding and fine grinding processes and has low grinding efficiency.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A belt sander comprises a frame, wherein at least one connecting rod assembly is provided on the frame, and both ends of the connecting rod assembly protrude from the frame and are fixed with a sanding mechanism.

[0007] The grinding mechanism comprises a first grinding assembly and a second grinding assembly, wherein the first grinding assembly is fixedly connected to the end of the connecting rod, and the second grinding assembly is movably arranged on the top of the first grinding assembly;

[0008] The first grinding assembly is provided with a first sanding belt, and the mesh numbers of the first sanding belts of the first grinding assemblies decrease or increase in sequence.

[0009] The second grinding assembly is provided with a second grinding belt, and the mesh sizes of the second grinding belts of the plurality of second grinding assemblies decrease or increase in sequence.

[0010] Furthermore, the grinding mechanism is arranged to be inclined, and the grinding mechanisms located at both ends of the connecting rod are inclined in a positive "eight" shape or an inverted "eight" shape.

[0011] Further, the first grinding assembly includes a first mounting beam, a first rotary drive member, a first driving roller and a first driven roller;

[0012] A guide unit is disposed on the top of the first mounting crossbeam, and the second grinding assembly is movably disposed on the guide unit;

[0013] A mounting tube is fixed on the side of the first mounting crossbeam, the mounting tube is arranged obliquely, and the end of the connecting rod is inserted and fixed in the mounting tube;

[0014] The first driving roller and the first driven roller are arranged on the first mounting crossbeam via a rotating shaft, and the first abrasive belt is wound around the first driving roller and the first driven roller;

[0015] The first rotary drive member is fixed on the first mounting crossbeam and is drivingly connected to the first active roller to drive the first active roller to rotate.

[0016] Further, the second grinding assembly includes a second mounting beam, a second rotary drive member, a second driving roller and a second driven roller;

[0017] A slider base is provided at the bottom of the second mounting crossbeam, and the slider base is movably provided on the guide unit. A telescopic driving member is fixed on the first mounting crossbeam, and a driving end of the telescopic driving member is fixedly connected to the slider base.

[0018] The second driven roller is arranged on the second mounting beam via a rotating shaft, the second rotating driving member is arranged on the second mounting beam, the second driving roller is arranged on the driving end of the second rotating driving member, and the second abrasive belt is wound around the second driving roller and the second driven roller.

[0019] Furthermore, a tension driving member is fixed on the second mounting crossbeam, and a driving plate is fixed on the driving end of the tension driving member.

[0020] A second motor seat is fixed to the side of the second rotary drive member, and the second motor seat is arranged on the drive plate. The tension drive member drives the second rotary drive member to move, thereby driving the second active roller to approach or move away from the second driven roller.

[0021] Furthermore, an adjusting bearing is fixed between the driving plate and the second motor seat, and a lifting and lowering adjustment component is fixed on the driving plate.

[0022] The lifting and adjusting assembly includes a base rod and a lifting rod, one end of the base rod is fixedly connected to the driving plate, the lifting rod passes through the other end of the base rod and is fixedly connected to the base rod, the end of the lifting rod is connected to a connecting rod extending outward, and the end of the connecting rod is fixedly connected to the second motor seat.

[0023] Furthermore, a tensioning assembly is fixed to the side of the first mounting beam, and the tensioning assembly includes a tensioning mounting plate and a tensioning wheel. One end of the tensioning mounting plate is fixedly connected to the first mounting beam, and the tensioning wheel is arranged at the other end of the tensioning mounting plate through a rotating shaft. The first abrasive belt is wound around the first driving wheel, the tensioning wheel and the first driven wheel.

[0024] Further, an adjustment assembly is fixed on the first mounting crossbeam, and the adjustment assembly includes an adjustment drive member and an adjustment arm;

[0025] The end of the first mounting crossbeam is provided with a connecting arm extending outward, the adjusting driving member is fixed on the top of the first mounting crossbeam, the driving end of the adjusting driving member is drivingly connected to one end of the adjusting arm, and the other end of the adjusting arm is movably connected to the connecting arm through a rotating shaft.

[0026] A driven wheel mounting seat is fixed on the adjusting arm, and the first driven wheel is arranged on the driven wheel mounting seat via a rotating shaft.

[0027] Furthermore, a waist-shaped through hole is provided on the first mounting crossbeam, a mounting plate is fixed on the first mounting crossbeam, and a driving end of the first rotating driving member passes through the mounting plate and the waist-shaped through hole and extends to the inside of the first mounting crossbeam to be drivingly connected to the first active roller;

[0028] The mounting plate is provided with a strip-shaped mounting through hole, and the mounting plate is fixedly connected to the first mounting crossbeam via the strip-shaped mounting through hole and bolts.

[0029] Furthermore, the width of the first abrasive belt is greater than the width of the second abrasive belt.

[0030] After adopting the above technical solution, the utility model has the following advantages compared with the background technology:

[0031] 1. In this solution, the grinding mechanism is located on both sides of the frame, making full use of the space of the frame. In addition, the center of gravity of the frame is more stable, ensuring that the belt grinder has good stability during the grinding process. Multiple grinding mechanisms are set with first and second sanding belts of different mesh sizes, and coarse and fine grinding are completed in one grinding process, effectively improving the grinding efficiency.

[0032] 2. The grinding mechanisms at both ends of the connecting rod are tilted in a positive "eight" shape or an inverted "eight" shape. During the grinding process, the manipulator clamps the product close to the grinding mechanism and grinds the product. The tilted grinding mechanism effectively increases the grinding range and avoids collision between the product and the external shell or other equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1It is a structural schematic diagram of the abrasive belt grinder of the utility model;

[0034] Figure 2 This is a schematic diagram of the frame structure of the belt grinder of the utility model;

[0035] Figure 3 It is a schematic diagram of the front structure of the grinding mechanism of the belt grinder of the utility model;

[0036] Figure 4 It is an enlarged structural schematic diagram of the grinding mechanism A part of the belt grinder of the utility model;

[0037] Figure 5 It is a schematic diagram of the back part of the grinding mechanism of the belt grinder of the utility model;

[0038] Figure 6 It is an enlarged structural schematic diagram of the grinding mechanism B part of the belt grinder described in the utility model.

[0039] Description of reference numerals:

[0040] 1. Frame;

[0041] 2. connecting rod assembly; 21. first connecting rod; 22. second connecting rod;

[0042] 3. Grinding mechanism; 31. First grinding assembly; 311. First driving roller; 312. First driven roller; 313. First mounting crossbeam; 3131. Mounting cylinder; 3132. Connecting arm; 3133. Oval through hole; 3134. Mounting plate; 3135. Strip mounting through hole; 3136. Inspection channel; 314. First rotating driving member; 3141. Driving wheel; 3142. Belt; 315. Tensioning assembly; 3151. Tensioning mounting plate; 3152. Tensioning wheel; 316. Adjusting assembly; 3161. Adjusting driving member; 3162. Adjusting arm; 3163, driven wheel mounting seat; 317, guide unit; 318, telescopic drive member; 319, first sanding belt; 32, second grinding assembly; 321, second active roller; 322, second driven roller; 323, second mounting beam; 3231, sliding base; 324, second rotary drive member; 3241, second motor seat; 325, tensioning drive member; 3251, drive plate; 326, adjustment bearing; 327, lifting and lowering adjustment assembly; 3271, base rod; 3272, lifting rod; 3273, connecting rod; 3274, nut; 328, second sanding belt. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0044] In addition, it should be noted that the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element of the present invention must have a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] When an element is referred to as being “fixed to” or “disposed on” or “provided on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0046] 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 detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0047] Example

[0048] Please refer to Figure 1-6As shown, this embodiment provides a belt sander, including a frame 1, on which at least one connecting rod assembly 2 is passed, and both ends of the connecting rod assembly 2 protrude from the frame 1 and are fixed with a sanding mechanism 3. The sanding mechanism 3 includes a first sanding assembly 31 and a second sanding assembly 32, wherein the first sanding assembly 31 is fixedly connected to the end of the connecting rod, and the second sanding assembly 32 is movably arranged on the top of the first sanding assembly 31. The first sanding assembly 31 is wound with a first sanding belt 319, and the mesh numbers of the first sanding belts 319 of the plurality of first sanding assemblies 31 are successively decreased or increased. The second sanding assembly 32 is wound with a second sanding belt 328, and the mesh numbers of the second sanding belts 328 of the plurality of second sanding assemblies 32 are successively decreased or increased. In this embodiment, the connecting rod assembly 2 includes a first connecting rod 21 and a second connecting rod 22, which are arranged in parallel and spaced apart, and the first connecting rod 21 and the second connecting rod 22 provide multi-directional support force for the sanding mechanism 3 to ensure the stability of the sanding mechanism 3 during the sanding process. The number of specific connecting rod assemblies 2 is two groups, and the two connecting rod assemblies 2 are arranged at intervals in the vertical direction. The two groups of connecting rod assemblies 2 connect four grinding mechanisms 3. In this embodiment, the mesh numbers of the first sanding belts 319 of the four grinding mechanisms 3 are successively reduced. Similarly, the mesh numbers of the first sanding belts 319 can also be successively increased, or irregularly arranged. The mesh numbers of the second sanding belts 328 of the four grinding mechanisms 3 are successively reduced. Similarly, the mesh numbers of the second sanding belts 328 can also be successively increased, or irregularly arranged. The grinding mechanisms 3 are located on both sides of the frame 1, making full use of the space of the frame 1. And the center of gravity of the frame 1 is more stable, ensuring that the belt grinder has good stability during the grinding process. Multiple grinding mechanisms 3 are provided with first sanding belts 319 and second sanding belts 328 of different mesh numbers, and rough grinding and fine grinding are completed in one grinding process, effectively improving the grinding efficiency. And in this embodiment, the width of the first sanding belt 319 is greater than the width of the second sanding belt 328, which meets the grinding requirements of different structural positions of the product and has better practicality. Likewise, the number of connecting rod assemblies 2 can also be set to one group, three groups or more groups according to grinding requirements.

[0049] Please refer to Figure 1 As shown, the grinding mechanism 3 is tilted, and the grinding mechanisms 3 at both ends of the connecting rod are tilted in a positive "eight" shape or an inverted "eight" shape. In this embodiment, the grinding mechanisms 3 at both ends of the connecting rod are tilted in a positive "eight" shape. During the grinding process, the manipulator clamps the product close to the grinding mechanism 3 and grinds the product. The tilted grinding mechanism 3 effectively increases the grinding range and prevents the product from colliding with the external shell or other equipment.

[0050] Please refer to Figure 3-6As shown, the first grinding assembly 31 includes a first mounting crossbeam 313, a first rotating driving member 314, a first active roller 311 and a first driven roller 312. Specifically, the first rotating driving member 314 is a driving motor, and can also be other driving mechanisms for driving rotation. A mounting cylinder 3131 is fixed to the side of the first mounting crossbeam 313. The mounting cylinder 3131 is tilted, and the end of the connecting rod is plugged and fixed in the mounting cylinder 3131. That is, there is an angle between the extension direction of the mounting cylinder 3131 and the extension plane of the first mounting crossbeam 313, ensuring that the mounting cylinder 3131 is in a horizontal state and the first mounting crossbeam 313 is in an inclined state. The first active roller 311 and the first driven roller 312 are arranged on the first mounting crossbeam 313 through a rotating shaft, and the first sanding belt 319 is wound around the first active roller 311 and the first driven roller 312. The first rotary driving member 314 is fixed on the first mounting cross beam 313 and is drivingly connected to the first driving roller 311 to drive the first driving roller 311 to rotate, thereby driving the first driven roller 312 to rotate.

[0051] In this embodiment, a tensioning assembly 315 is fixed to the side of the first mounting crossbeam 313, and the tensioning assembly 315 includes a tensioning mounting plate 3151 and a tensioning wheel 3152. One end of the tensioning mounting plate 3151 is fixedly connected to the first mounting crossbeam 313, and the tensioning wheel 3152 is arranged at the other end of the tensioning mounting plate 3151 through a rotating shaft. The first sanding belt 319 is wound around the first driving wheel, the tensioning wheel 3152 and the first driven wheel. The tensioning wheel 3152 ensures that the first sanding belt 319 is in a taut state, ensuring that the first sanding belt 319 has a better sanding effect during the sanding process.

[0052] In this embodiment, an adjustment assembly 316 is fixed on the first mounting crossbeam 313, and the adjustment assembly 316 includes an adjustment drive 3161 and an adjustment arm 3162. At the same time, a connecting arm 3132 extending outward is provided at the end of the first mounting crossbeam 313. Specifically, the adjustment drive 3161 is a telescopic cylinder, and can also be other telescopic drive mechanisms. The adjustment drive 3161 is fixed on the top of the first mounting crossbeam 313, and the driving end of the adjustment drive 3161 is drivingly connected to one end of the adjustment arm 3162, and the other end of the adjustment arm 3162 is movably connected to the connecting arm 3132 through a rotating shaft. A driven wheel mounting seat 3163 is fixed on the adjustment arm 3162, and the first driven wheel is arranged on the driven wheel mounting seat 3163 through a rotating shaft. During use, the adjustment assembly 316 adjusts the position of the first driven roller 312 to further ensure that the first sanding belt 319 is in a tight state, thereby improving the grinding effect.

[0053] A waist-shaped through hole 3133 is provided on one side of the first mounting crossbeam 313, and a mounting plate 3134 is fixed on the first mounting crossbeam 313, and the mounting plate 3134 is covered on the waist-shaped through hole 3133. The driving end of the first rotating driving member 314 passes through the mounting plate 3134 and the waist-shaped through hole 3133, and extends to the inside of the first mounting crossbeam 313 to be drivingly connected to the first active roller 311. In this embodiment, the driving end of the first rotating driving member 314 is connected to a driving wheel 3141, and the driving wheel 3141 and the driving part of the first active roller 311 are connected by a belt 3142. The first rotating driving member 314 rotates by driving the driving wheel 3141, thereby driving the first active roller 311 to rotate. A strip-shaped mounting through hole 3135 is provided on the mounting plate 3134, and the mounting plate 3134 is fixedly connected to the first mounting crossbeam 313 through the strip-shaped mounting through hole 3135 and bolts. The installation position of the strip-shaped installation hole installation plate 3134 provides a selection space. At the same time, the oval through hole 3133 makes way for the driving end of the first rotating drive member 314, which is convenient for adjusting the position of the first rotating drive member 314, ensuring that the belt 3142 is in a running state, and improving the driving efficiency. Similarly, the first rotating drive member 314 can also be driven and connected to the first active roller 311 by a gear chain or other driving method. In this embodiment, an inspection channel 3136 is provided on the other side opposite to the first mounting beam 313, and the inspection channel 3136 corresponds to the position of the oval through hole 3133, which is convenient for inspecting the first rotating drive member 314. An inspection cover (not shown in the attached figure) is fixed on the first mounting beam 313, and the inspection cover is covered on the inspection channel 3136 to protect the internal structure of the first mounting beam 313.

[0054] A guide unit 317 is disposed on the top of the first mounting beam 313, and the second grinding assembly 32 is movably disposed on the guide unit 317. Specifically, the guide unit 317 is a slide rail, and it can also be other guiding mechanisms that play a guiding role. The second grinding assembly 32 includes a second mounting beam 323, a second rotating drive member 324, a second active roller 321, and a second driven roller 322. Specifically, the second rotating drive member 324 is a driving motor, and it can also be other driving mechanisms that drive rotation. A slider base is disposed at the bottom of the second mounting beam 323, and the slider base is movably disposed on the guide unit 317. A telescopic drive member 318 is fixed on the first mounting beam 313, and the driving end of the telescopic drive member is fixedly connected to the slider base. Specifically, the telescopic drive member 318 is a telescopic cylinder, and it can also be other telescopic drive mechanisms. The second driven roller 322 is arranged on the second mounting beam 323 through a rotating shaft, the second rotating driving member 324 is arranged on the second mounting beam 323, the second driving roller 321 is arranged on the driving end of the second rotating driving member 324, and the second sanding belt 328 is wound around the second driving roller 321 and the second driven roller 322. The second grinding assembly 32 adjusts the second driven wheel and the first driving wheel to a suitable position through the guide unit 317 to avoid the distance between the two being too small to meet the grinding requirements of the product, and to avoid the distance between the two being too large to reduce the space utilization rate.

[0055] In this embodiment, a tensioning driving member 325 is fixed on the second mounting crossbeam 323, and a driving plate 3251 is fixed to the driving end of the tensioning driving member 325. Specifically, the tensioning driving member 325 is a telescopic cylinder, and can also be other telescopic driving mechanisms. A second motor seat 3241 is fixed to the side of the second rotating driving member 324, and the second motor seat 3241 is set on the driving plate 3251. The tensioning driving member 325 drives the second rotating driving member 324 to move, thereby driving the second active roller 321 to approach or move away from the second driven roller 322. Ensure that the second sanding belt 328 is in a taut state to improve the grinding effect.

[0056] In this embodiment, an adjustment bearing 326 is fixed between the driving plate 3251 and the second motor base 3241, and the driving plate 3251 and the second motor base 3241 realize relative rotation through the bearing. A lifting adjustment assembly 327 is fixed on the driving plate 3251, and the lifting adjustment assembly 327 includes a base rod 3271 and a lifting rod 3272, one end of the base rod 3271 is fixedly connected to the driving plate 3251, and the lifting rod 3272 passes through the other end of the base rod 3271 and is fixedly connected to the base rod 3271, and the end of the lifting rod 3272 is connected to a connecting rod 3273 extending outwards, and the end of the connecting rod 3273 is fixedly connected to the second motor base 3241. In this embodiment, the lifting rod 3272 is provided with an external thread, and two nuts 3274 are threadedly connected to the lifting rod 3272. The two nuts 3274 are respectively located on both sides of the base rod 3271. By adjusting the positions of the two nuts 3274, the position of the lifting rod 3272 is adjusted, thereby adjusting the inclination angle of the second rotating drive member 324. Avoid the deviation of the second sanding belt 328 due to the difference in the inner and outer lengths of the second sanding belt 328, and ensure that the second sanding belt 328 is in the center during the grinding process. For example, the outer length of the second sanding belt 328 is greater than the inner length. During the grinding process, the second sanding belt 328 will deviate outward, adjust the driving end of the second rotating drive member 324 to tilt upward, thereby driving the second driving wheel to tilt upward, and applying a downward force to the second sanding belt 328, effectively avoiding the second sanding belt 328 from being cheap, ensuring that the grinding process is carried out smoothly, and improving the grinding efficiency.

[0057] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A belt sander, characterized in that: The machine frame comprises a frame, wherein at least one connecting rod assembly is provided on the frame, and both ends of the connecting rod assembly protrude from the frame and are fixed with a grinding mechanism. The grinding mechanism comprises a first grinding assembly and a second grinding assembly, wherein the first grinding assembly is fixedly connected to the end of the connecting rod, and the second grinding assembly is movably arranged on the top of the first grinding assembly; The first grinding assembly is provided with a first sanding belt, and the mesh numbers of the first sanding belts of the first grinding assemblies decrease or increase in sequence. The second grinding assembly is provided with a second grinding belt, and the mesh sizes of the second grinding belts of the plurality of second grinding assemblies decrease or increase in sequence.

2. The belt sander according to claim 1, characterized in that: The grinding mechanism is tilted, and the grinding mechanisms located at both ends of the connecting rod are tilted in a positive "eight" shape or a reverse "eight" shape.

3. The belt sander according to claim 1, characterized in that: The first grinding assembly includes a first mounting beam, a first rotary drive member, a first driving roller, and a first driven roller; A guide unit is disposed on the top of the first mounting crossbeam, and the second grinding assembly is movably disposed on the guide unit; A mounting tube is fixed on the side of the first mounting crossbeam, the mounting tube is arranged obliquely, and the end of the connecting rod is inserted and fixed in the mounting tube; The first driving roller and the first driven roller are arranged on the first mounting crossbeam via a rotating shaft, and the first abrasive belt is wound around the first driving roller and the first driven roller; The first rotary drive member is fixed on the first mounting crossbeam and is drivingly connected to the first active roller to drive the first active roller to rotate.

4. The belt sander according to claim 3, characterized in that: The second grinding assembly includes a second mounting beam, a second rotary drive member, a second driving roller and a second driven roller; A slider base is provided at the bottom of the second mounting crossbeam, and the slider base is movably provided on the guide unit. A telescopic driving member is fixed on the first mounting crossbeam, and a driving end of the telescopic driving member is fixedly connected to the slider base. The second driven roller is arranged on the second mounting beam via a rotating shaft, the second rotating driving member is arranged on the second mounting beam, the second driving roller is arranged on the driving end of the second rotating driving member, and the second abrasive belt is wound around the second driving roller and the second driven roller.

5. The belt sander according to claim 4, characterized in that: A tension driving member is fixed on the second mounting crossbeam, and a driving plate is fixed on the driving end of the tension driving member. A second motor seat is fixed to the side of the second rotary drive member, and the second motor seat is arranged on the drive plate. The tension drive member drives the second rotary drive member to move, thereby driving the second active roller to approach or move away from the second driven roller.

6. The belt sander according to claim 5, characterized in that: An adjusting bearing is fixed between the driving plate and the second motor seat, and a lifting and lowering adjusting assembly is fixed on the driving plate. The lifting and adjusting assembly includes a base rod and a lifting rod, one end of the base rod is fixedly connected to the driving plate, the lifting rod passes through the other end of the base rod and is fixedly connected to the base rod, the end of the lifting rod is connected to a connecting rod extending outward, and the end of the connecting rod is fixedly connected to the second motor seat.

7. The belt sander according to claim 3, characterized in that: A tensioning assembly is fixed to the side of the first mounting beam, and the tensioning assembly includes a tensioning mounting plate and a tensioning wheel. One end of the tensioning mounting plate is fixedly connected to the first mounting beam, and the tensioning wheel is arranged at the other end of the tensioning mounting plate through a rotating shaft. The first abrasive belt is wound around the first driving wheel, the tensioning wheel and the first driven wheel.

8. The belt sander according to claim 7, characterized in that: An adjustment assembly is fixed on the first mounting crossbeam, and the adjustment assembly includes an adjustment drive member and an adjustment arm; The end of the first mounting crossbeam is provided with a connecting arm extending outward, the adjusting driving member is fixed on the top of the first mounting crossbeam, the driving end of the adjusting driving member is drivingly connected to one end of the adjusting arm, and the other end of the adjusting arm is movably connected to the connecting arm through a rotating shaft. A driven wheel mounting seat is fixed on the adjusting arm, and the first driven wheel is arranged on the driven wheel mounting seat via a rotating shaft.

9. The belt sander according to claim 3, characterized in that: A waist-shaped through hole is provided on the first mounting crossbeam, a mounting plate is fixed on the first mounting crossbeam, and a driving end of the first rotating driving member passes through the mounting plate and the waist-shaped through hole and extends to the inside of the first mounting crossbeam to be drivingly connected to the first active roller; The mounting plate is provided with a strip-shaped mounting through hole, and the mounting plate is fixedly connected to the first mounting crossbeam via the strip-shaped mounting through hole and bolts.

10. The belt sander according to claim 1, characterized in that: The width of the first abrasive belt is greater than the width of the second abrasive belt.

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