A sander

Abstract

This utility model discloses a sander, relating to the field of sanders. It includes a sander body, a base plate at the lower end of the sander body, and a sandpaper clamping and tensioning structure on the base plate. The sandpaper clamping and tensioning structure includes a clamping rod and a tensioning rod, both of which can rotate back and forth relative to the base plate. The sander body drives the base plate, the base plate is used to attach sandpaper, the clamping rod clamps the sandpaper to the base plate, and the tensioning rod tensions the sandpaper after clamping. This sander not only clamps the sandpaper but also tensions it after clamping, effectively avoiding a series of problems caused by loose sandpaper, such as uneven sanding, reduced work efficiency, and sandpaper breakage.

Description

Technical Field

[0001] This utility model relates to the field of sanding machines, specifically to a sanding machine that can clamp sandpaper and further tighten the sandpaper. Background Technology

[0002] A sander is a mechanical device used for surface treatment of wood, metal, or other materials, primarily for grinding and smoothing workpiece surfaces. The sandpaper holder is a crucial component of the sander, ensuring the correct installation and proper tension of the sandpaper or abrasive, which is essential for guaranteeing the sander's efficiency and quality.

[0003] Currently, after sandpaper is installed on a sander, sandpaper loosening may occur. Sandpaper loosening can cause a series of negative effects, such as: sandpaper loosening will prevent the sandpaper from contacting the workpiece surface evenly, resulting in uneven sanding; sandpaper loosening will reduce the abrasive area involved in the work, thereby reducing sanding efficiency; sandpaper loosening will cause it to repeatedly creep during the working process, which will lead to reduced work efficiency and sandpaper breakage. Utility Model Content

[0004] Purpose of this utility model: The purpose of this utility model is to provide a sanding machine that solves a series of problems caused by loose sandpaper, such as uneven sanding, reduced work efficiency, and sandpaper breakage. This sanding machine can not only clamp the sandpaper but also tighten it after clamping, effectively avoiding the problems caused by loose sandpaper.

[0005] Technical solution: A sander, including a sander body, a base plate provided at the lower end of the sander body, and a sandpaper clamping and tensioning structure provided on the base plate; The sandpaper clamping and tensioning structure includes a clamping rod and a tensioning rod, both of which can rotate back and forth relative to the base plate. The sander body is used to drive the base plate to move; The base plate is used to attach sandpaper; The clamping rod is used to clamp the sandpaper to the base plate; The tensioning rod is used for tensioning after the sandpaper is clamped.

[0006] Furthermore: the base plate is provided with the sandpaper clamping and tensioning structure at least on the upper end of one of its front and rear sides; The sandpaper clamping and tensioning structure also includes a fixed seat and a snap-fit ​​seat arranged at intervals along the left and right directions on the upper end of the base plate. The clamping rod and the tensioning rod are rotatably connected between the fixed seat and the snap-fit ​​seat. The snap-fit ​​seat has a snap-fit ​​groove on its upper end along the left and right directions.

[0007] Furthermore: the clamping rod includes a clamping part, a first clamping connecting part provided at one end of the clamping part facing the fixed base, and a second clamping connecting part provided at one end of the clamping part facing the snap-fit ​​base; The tensioning rod includes a tensioning part, a first tensioning connecting part provided at one end of the tensioning part facing the fixed seat, and a second tensioning connecting part provided at one end of the tensioning part facing the snap-fit ​​seat. The clamping part is used to clamp the sandpaper to the base plate; The tensioning part is used for tensioning after the sandpaper is clamped; The shortest distance between the clamping part and the center of the base plate is less than the shortest distance between the tensioning part and the center of the base plate.

[0008] Furthermore: the upper end of the base plate has a clamping groove and a tensioning groove along the left-right direction; During the back-and-forth rotation of the clamping rod relative to the base plate, the clamping part can be inserted into the clamping groove; During the back-and-forth rotation of the tensioning rod relative to the base plate, the tensioning part can be inserted into the tensioning groove.

[0009] Furthermore, the sandpaper clamping and tensioning structure also includes a first adapter, a second adapter, a first snap-fit ​​component, and a second snap-fit ​​component; The first clamping connection is connected to the first adapter, the first tensioning connection is connected to the second adapter, and both the first adapter and the second adapter are rotatably connected to the fixed base. The second clamping connection part is connected to the first snap-fit ​​part, and the second tensioning connection part is connected to the second snap-fit ​​part. Both the first snap-fit ​​part and the second snap-fit ​​part are movably snapped into the snap-fit ​​groove.

[0010] Further: the first snap-fit ​​member extends through the snap-fit ​​groove at one end opposite to the fixed base, and a first operating rod is connected to its extended end; The second snap-fit ​​member extends through the snap-fit ​​groove at one end facing the opposite direction of the fixed base, and a second operating rod is connected to its extended end. The first operating lever is used to drive the clamping part to rotate back and forth; The second operating lever is used to drive the tensioning part to rotate back and forth.

[0011] Furthermore: the clamping part and the tensioning part are located on the same side in the front-rear direction of the fixing base; The first operating lever and the second operating lever are located on the same side in the front-rear direction of the fixed base and are connected together to the operating handle; The operating handle is used to drive the clamping part and the tensioning part to rotate together via the first operating lever and the second operating lever.

[0012] Furthermore: During the process of the operating handle driving the clamping part and the tensioning part to rotate together through the first operating rod and the second operating rod, the rotation angle between the clamping part and the bottom of the clamping groove is smaller than the rotation angle between the tensioning part and the bottom of the tensioning groove, so that when the clamping part just touches the bottom of the clamping groove, there is a gap between the tensioning part and the bottom of the tensioning groove.

[0013] Furthermore, a limiting screw is provided at the upper end of the locking seat and near the locking groove, with the head of the limiting screw located directly above the locking groove.

[0014] Furthermore, the first adapter and the second adapter are arranged vertically at intervals.

[0015] The beneficial effects of this utility model are as follows: The sandpaper clamping and tensioning structure of this application can not only clamp the sandpaper, but also continue to tighten the sandpaper after clamping, thereby further tightening the sandpaper and effectively preventing the sandpaper from loosening. While ensuring the working efficiency of the sander, it also improves the life of the sandpaper. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a sander according to the present invention; Figure 2 This is a schematic diagram of the sandpaper clamping and tensioning structure; Figure 3 This is a schematic diagram showing the location of the card slot; Figure 4 This is a partial schematic diagram of the sandpaper clamping and tensioning structure.

[0017] In the diagram: 1. Sander body; 2. Base plate; 3. Sandpaper clamping and tensioning structure; 4. Fixing base; 5. Snap-fit ​​base; 6. Clamping rod; 7. Tensioning rod; 8. Clamping part; 9. Tensioning part; 10. Snap-fit ​​groove; 11. First clamping connection part; 12. Second clamping connection part; 13. First tensioning connection part; 14. Second tensioning connection part; 15. Clamping groove; 16. Tensioning groove; 17. First adapter; 18. Second adapter; 19. First snap-fit ​​part; 20. Second snap-fit ​​part; 21. First operating lever; 22. Second operating lever; 23. Operating handle; 24. Limit screw. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0019] Those skilled in the art will understand that, without conflict, the features in the following embodiments and implementations can be combined with each other.

[0020] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," and "rear," which indicate orientation or positional relationship, are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0021] As used herein, the singular forms “a,” “an,” and “the” include plural objects, and the plural form “multiple” includes two or more objects, unless otherwise expressly indicated. As used herein, the term “or” is generally used to include the meaning of “and / or,” unless otherwise expressly indicated, and the terms “install,” “connect,” and “link” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Connections can be direct or indirect through an intermediate medium, and can be internal communication between two components or an interaction between two components.

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments: like Figure 1-4 As shown, a sander includes a sander body 1 and a base plate 2 located at the lower end of the sander body 1. The sander body 1 drives the base plate 2 to move, and the base plate 2 is used to attach sandpaper. In this application, a base plate pad is also provided at the lower end of the base plate 2. The sandpaper is attached to the base plate 1 via the base plate pad. The base plate pad is generally made of materials such as rubber and is used to provide cushioning and vibration absorption. The sandpaper is used to polish the surface of the workpiece during sanding operations. The sander body 1 includes a housing, a motor and a transmission structure housed within the housing. The motor is the drive source, and the motor drives the base plate 2 to move through the transmission structure. The movement of the base plate 2, in turn, drives the sandpaper to polish the surface of the workpiece. Since the existing technology for the sander body 1 is relatively mature, it will not be described in detail here.

[0023] The sander in this application also includes a sandpaper clamping and tensioning structure 3 on the base plate 2. The base plate 2 has the sandpaper clamping and tensioning structure 3 on at least one of its front and rear upper ends; that is, the base plate 2 can have the sandpaper clamping and tensioning structure 3 on both its front and rear upper ends, or it can have the sandpaper clamping and tensioning structure 3 on one of its front and rear upper ends and a traditional sandpaper clamp on the other upper end. The traditional sandpaper clamp includes, but is not limited to, a fixedly mounted round shaft, a torsion spring fitted on the round shaft, and a clamping rod that can rotate relative to the round shaft. The clamping rod uses the force applied by the torsion spring to clamp the sandpaper. The existing technology for traditional sandpaper clamps is already quite mature, so it will not be described in detail here.

[0024] Compared to traditional sandpaper clamps, the sandpaper clamping and tensioning structure 3 of this application not only clamps the sandpaper but also further tensions it after clamping. Preferably, the sandpaper clamping and tensioning structure 3 is located on the upper end of one side, while a traditional sandpaper clamp is located on the upper end of the other side. The traditional sandpaper clamp holds one end of the sandpaper, while the sandpaper clamping and tensioning structure 3 can hold the other end of the sandpaper and further tension it after clamping. In this application, "sandpaper tightening" or "sandpaper tensioning" refers to tightening or pulling the sandpaper to prevent it from loosening.

[0025] The sandpaper clamping and tensioning structure 3 of this application includes a fixed seat 4 and a snap-fit ​​seat 5 arranged at intervals along the left and right directions on the upper end of the base plate 2, and a clamping rod 6 and a tensioning rod 7 rotatably connected between the fixed seat 4 and the snap-fit ​​seat 5. Both the clamping rod 6 and the tensioning rod 7 can rotate back and forth relative to the base plate 2. The clamping rod 6 includes a clamping part 8, and the tensioning rod 7 includes a tensioning part 9. The upper end of the base plate 2 has a clamping groove 15 and a tensioning groove 16 in the left and right directions. The clamping part 8 cooperates with the clamping groove 15 to clamp the sandpaper. For example, when the clamping rod 6 rotates back and forth relative to the base plate 2, the clamping part 8 can be inserted into the clamping groove 15 to clamp the sandpaper. The tensioning part 9 cooperates with the tensioning groove 16 to further tension the sandpaper after it is clamped by the clamping part 8. For example, when the tensioning rod 7 rotates back and forth relative to the base plate 2, the tensioning part 9 can be inserted into the tensioning groove 16 to further tension the sandpaper after it is clamped. Both the clamping part 8 and the tensioning part 9 in this application are straight rods and are arranged in the left-right direction. The clamping part 8 is arranged parallel to the bottom surface of the clamping groove 15 at intervals, and the tensioning part 9 is arranged parallel to the bottom surface of the tensioning groove 16 at intervals.

[0026] In this application, both the clamping rod 6 and the tensioning rod 7 are rotatably connected. When the clamping rod 6 rotates, it will cause the clamping part 8 to rotate as well. The clamping groove 15 is opened on the base plate 2 and is located on the circumferential path of the clamping part 8, so that the clamping part 8 can be inserted into the clamping groove 15 during the rotation of the clamping rod 6. When the tensioning rod 7 rotates, it will cause the tensioning part 9 to rotate as well. The tensioning groove 16 is opened on the base plate 2 and is located on the circumferential path of the tensioning part 9, so that the tensioning part 9 can be inserted into the tensioning groove 16 during the rotation of the tensioning rod 7.

[0027] In this application, the shortest distance between the clamping part 8 and the center of the base plate 2 is less than the shortest distance between the tensioning part 9 and the center of the base plate 2. That is, the clamping part 8 is located between the tensioning part 9 and the center of the base plate 2, ensuring that the sandpaper, after being clamped by the clamping part 8, can be further tensioned by the tensioning part 9. Similarly, the maximum distance between the clamping groove 15 and the center of the base plate 2 is less than the shortest distance between the tensioning groove 16 and the center of the base plate 2. That is, the clamping groove 15 is located between the tensioning groove 16 and the center of the base plate 2, further ensuring that the sandpaper, after being clamped by the clamping part 8, can be further tensioned by the tensioning part 9.

[0028] The clamping rod 6 of this application also includes a first clamping connecting part 11 provided at one end of the clamping part 8 facing the fixed seat 4 and a second clamping connecting part 12 provided at one end of the clamping part 8 facing the snap-fit ​​seat 5. The tensioning rod 7 also includes a first tensioning connecting part 13 provided at one end of the tensioning part 9 facing the fixed seat 4 and a second tensioning connecting part 14 provided at one end of the tensioning part 9 facing the snap-fit ​​seat 5.

[0029] The application has a snap-fit ​​groove 10 on the upper end of the snap-fit ​​base 5 along the left and right direction. A threaded hole is vertically opened on the upper end of the snap-fit ​​base 5 near the snap-fit ​​groove 10. The limiting screw 24 is screwed into the threaded hole. The head of the limiting screw 24 is located directly above the snap-fit ​​groove 10. This can effectively prevent the parts in the snap-fit ​​groove 10 from coming out. The head of the limiting screw 24 refers to a part or part of the head of the limiting screw 24.

[0030] The sandpaper clamping and tensioning structure 3 of this application further includes a first adapter 17, a second adapter 18, a first locking member 19, and a second locking member 20. The first clamping connecting part 11 is connected to the first adapter 17, and the first tensioning connecting part 13 is connected to the second adapter 18. Both the first adapter 17 and the second adapter 18 are rotatably connected to the fixed base 4. The second clamping connecting part 12 is connected to the first locking member 19, and the second tensioning connecting part 14 is connected to the second locking member 20. Both the first locking member 19 and the second locking member 20 are movably engaged into the locking groove 10.

[0031] The first adapter 17, second adapter 18, first latching member 19, and second latching member 20 of this application are all designed as circular shafts, and all are designed along the left-right direction. The first adapter 17 is rotatably connected to the fixing base 4 at one end and connected to the first clamping connection part 11 at the other end; the second adapter 18 is rotatably connected to the fixing base 4 at one end and connected to the first tensioning connection part 13 at the other end; the first latching member 19 is connected to the second clamping connection part 12 at one end and extends movably through the latching groove 10 at the other end; the second latching member 20 is connected to the second tensioning connection part 14 at one end and extends movably through the latching groove 10 at the other end. The first adapter 17 and the second adapter 18 are arranged vertically at intervals. For example, the second adapter 18 can be positioned directly above the first adapter 17, with the second latching member 20 located above and the first latching member 19 below within the latching groove 10. The mounting base 4 of this application has a set of round shaft holes, all of which are opened in the left-right direction. The round shaft holes are divided into a first adapter round shaft hole and a second adapter round shaft hole. The second adapter round shaft hole is adjacent to the first adapter round shaft hole and located directly above it. The first adapter is inserted into the first adapter round shaft hole and the second adapter is inserted into the second adapter round shaft hole, so as to realize the rotational connection between the first adapter, the second adapter and the mounting base 4.

[0032] The clamping rod 6 of this application can rotate back and forth around the first adapter 17, that is, the clamping part 8 can rotate around the first adapter 17; the tensioning rod 7 can rotate back and forth around the second adapter 18, that is, the tensioning part 9 can rotate around the second adapter 18. A limiting screw 24 is provided at the upper end of the snap-fit ​​seat 5 and near the snap-fit ​​groove 10. The head of the limiting screw 24 is located directly above the snap-fit ​​groove 10, which can effectively prevent the first snap-fit ​​part 19 and the second snap-fit ​​part 20 from coming out of the snap-fit ​​groove 10.

[0033] The first locking member 19 of this application extends movably through the locking groove 10 at one end opposite to the fixed base 4, and its extended end is connected to the first operating rod 21, which can drive the clamping part 8 to rotate back and forth. The second locking member 20 extends movably through the locking groove 10 at one end opposite to the fixed base 4, and its extended end is connected to the second operating rod 22, which can drive the tensioning part 9 to rotate back and forth.

[0034] When the first operating lever 21 and the clamping part 8 are on the same side of the fixed base 4 in the front-rear direction, raising (or lowering) the first operating lever 21 will cause the clamping part 8 to rise (or fall) together; when the first operating lever 21 and the clamping part 8 are on opposite sides of the fixed base 4 in the front-rear direction, raising (or lowering) the first operating lever 21 will cause the clamping part 8 to move in the opposite direction, i.e., fall (or rise). When the second operating lever 22 and the tensioning part 9 are on the same side of the fixed base 4 in the front-rear direction, raising (or lowering) the second operating lever 22 will cause the tensioning part 9 to rise (or fall) together; when the second operating lever 22 and the tensioning part 9 are on opposite sides of the fixed base 4 in the front-rear direction, raising (or lowering) the second operating lever 22 will cause the tensioning part 9 to move in the opposite direction, i.e., fall (or rise). When assembling sandpaper on a sander, the user can first use the first operating lever 21 to move the clamping part 8 to clamp the sandpaper, and then use the second operating lever 22 to move the tensioning part 9 to tighten the sandpaper, thus achieving further tensioning after clamping.

[0035] The first operating lever 21, the second operating lever 22, the first locking member 19, the second locking member 20, the clamping rod 6, the tensioning rod 7, the first adapter 17, and the second adapter 18 of this application are all elastic and can deform when subjected to external pressure, and can return to their shape after the external force is removed. The first operating lever 21, the first locking member 19, the clamping rod 6, and the first adapter 17 of this application can be integrally molded. The second operating lever 22, the second locking member 20, the tensioning rod 7, and the second adapter 18 of this application can also be integrally molded. For example, two steel wires can be used, one of which constitutes the first operating lever 21, the first locking member 19, the clamping rod 6, and the first adapter 17, and the other steel wire constitutes the second operating lever 22, the second locking member 20, the tensioning rod 7, and the second adapter 18.

[0036] The first operating lever 21 and the second operating lever 22 of this application can also be connected to the operating handle 23. The operating handle 23 can drive the clamping part 8 and the tensioning part 9 to move together. That is, the operating handle 23 can drive the clamping part 8 and the tensioning part 9 to rotate together through the first operating lever 21 and the second operating lever 22. In order to facilitate the operation of the operating handle 23 to drive the clamping part 8 and the tensioning part 9 to move together, the clamping part 8 and the tensioning part 9 are both located on the same side of the front and rear direction of the fixed base 4. The first operating lever 21 and the second operating lever 22 of this application are also both located on the same side of the front and rear direction of the fixed base 4.

[0037] When the clamping part 8 and the tensioning part 9 move together via the operating handle 23, the rotation angles of the clamping part 8 and the tensioning part 9 are designed to ensure that the clamping part 8 clamps the sandpaper first. This design ensures that during the movement of the clamping part 8 and the tensioning part 9 by the operating handle 23, the rotation angle between the clamping part 8 and the bottom of the clamping groove 15 is less than the rotation angle between the tensioning part 9 and the bottom of the tensioning groove 16. This results in a gap between the tensioning part 9 and the bottom of the tensioning groove 16 when the clamping part 8 just touches the bottom of the clamping groove 15. In other words, during the movement of the clamping part 8 and the tensioning part 9, the clamping part 8 clamps the sandpaper first.

[0038] This application allows for tensioning of sandpaper after clamping via the operating handle 23. Taking an example where the first operating lever 21 and the second operating lever 22 are located on one side of the fixed base 4 in the front-rear direction, and the clamping part 8 and the tensioning part 9 are located on the other side of the fixed base 4 in the front-rear direction, this application will specifically illustrate how the sandpaper can be clamped via the operating handle 23 and then further tensioned: When sandpaper is loaded onto the sander, one end of the sandpaper is held by a traditional sandpaper clamp, while the other end first passes through the tension groove 16 and then is fed into the clamping groove 15. The hand-operated handle 23 is raised upwards. This upward movement of the handle causes the clamping part 8 and the tensioning part 9 to move downwards together via the first operating lever 21 and the second operating lever 22. During this downward movement, because the rotation angle between the clamping part 8 and the bottom of the clamping groove 15 is less than the rotation angle between the tensioning part 9 and the bottom of the tensioning groove 16, there is a gap between the tensioning part 9 and the bottom of the tensioning groove 16 when the clamping part 8 abuts against the bottom of the clamping groove 15. Therefore, the clamping part 8 first presses the sandpaper down until it reaches the bottom of the clamping groove 15, thus clamping the sandpaper. Then, continue to lift the operating handle 23 upwards. Because the first operating lever 21, the second operating lever 22, the first locking member 19, the second locking member 20, the clamping lever 6, the tensioning lever 7, the first adapter 17, and the second adapter 18 are all elastic, lifting the operating handle 23 upwards will cause the tensioning part 9 to continue moving downwards. The tensioning part 9 will continue to press down on the sandpaper, thereby achieving a further tensioning effect after the sandpaper is clamped. At this time, the downward pressure applied by the clamping part 8 on the sandpaper will also continue to increase. However, because the clamping part 8 is elastic, it can deform and continue to press down on and clamp the sandpaper. The sandpaper clamped by the clamping part 8 and tensioned by the tensioning part 9 can be removed by simply moving the operating handle 23 downwards, causing the clamping part 8 and the tensioning part 9 to rise accordingly.

[0039] This application, referencing existing technology, utilizes methods such as slotting or setting blocks on the base plate 2 to fix the position of the operating lever when the sandpaper is clamped and tensioned. For example, the sandpaper is clamped and tensioned via the operating handle 23. A portion of the first operating lever 21 is recessed downwards to form a V-shaped limiting part. The upper end of the base plate 2 facing the first operating lever 21 has a limiting groove. When the sandpaper is clamped and tensioned via the operating handle 23, the V-shaped limiting part on the first operating lever 21 is inserted into the limiting groove on the base plate 2, thus fixing the positions of the first operating lever 21 and the second operating lever 22. Since the existing technology for fixing the position of the operating lever for sandpaper clamping is already quite mature, it will not be elaborated upon here.

[0040] The sandpaper clamping and tensioning structure of this application has a clamping part and a tensioning part. The clamping part can clamp the sandpaper, and the tensioning part can continue to tighten the sandpaper after it is clamped, so as to further tighten the sandpaper and effectively prevent the sandpaper from loosening. While ensuring the working efficiency of the sander, it also improves the life of the sandpaper.

[0041] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the above specific embodiments. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A sander, characterized in that, Includes a sander body, a base plate at the lower end of the sander body, and a sandpaper clamping and tensioning structure on the base plate; The sandpaper clamping and tensioning structure includes a clamping rod and a tensioning rod, both of which can rotate back and forth relative to the base plate. The sander body is used to drive the base plate to move; The base plate is used to attach sandpaper; The clamping rod is used to clamp the sandpaper to the base plate; The tensioning rod is used for tensioning after the sandpaper is clamped.

2. A sander as claimed in claim 1, characterized in that The base plate is provided with the sandpaper clamping and tensioning structure at least on the upper end of the front and rear sides; The sandpaper clamping and tensioning structure also includes a fixed seat and a snap-fit ​​seat arranged at intervals along the left and right directions on the upper end of the base plate. The clamping rod and the tensioning rod are rotatably connected between the fixed seat and the snap-fit ​​seat. The snap-fit ​​seat has a snap-fit ​​groove on its upper end along the left and right directions.

3. A sander as claimed in claim 2, characterized in that The clamping rod includes a clamping part, a first clamping connecting part provided at one end of the clamping part facing the fixed base, and a second clamping connecting part provided at one end of the clamping part facing the snap-fit ​​base. The tensioning rod includes a tensioning part, a first tensioning connecting part provided at one end of the tensioning part facing the fixed seat, and a second tensioning connecting part provided at one end of the tensioning part facing the snap-fit ​​seat. The clamping part is used to clamp the sandpaper to the base plate; The tensioning part is used for tensioning after the sandpaper is clamped; The shortest distance between the clamping part and the center of the base plate is less than the shortest distance between the tensioning part and the center of the base plate.

4. A sanding machine according to claim 3, characterized in that, The bottom plate has a clamping groove and a tensioning groove on its upper end and along the left-right direction; During the back-and-forth rotation of the clamping rod relative to the base plate, the clamping part can be inserted into the clamping groove; During the back-and-forth rotation of the tensioning rod relative to the base plate, the tensioning part can be inserted into the tensioning groove.

5. A sanding machine according to claim 4, characterized in that, The sandpaper clamping and tensioning structure further includes a first adapter, a second adapter, a first snap-fit ​​component, and a second snap-fit ​​component; The first clamping connection is connected to the first adapter, the first tensioning connection is connected to the second adapter, and both the first adapter and the second adapter are rotatably connected to the fixed base. The second clamping connection part is connected to the first snap-fit ​​part, and the second tensioning connection part is connected to the second snap-fit ​​part. Both the first snap-fit ​​part and the second snap-fit ​​part are movably snapped into the snap-fit ​​groove.

6. A sanding machine according to claim 5, characterized in that, The first snap-fit ​​component extends through the snap-fit ​​groove at one end facing the opposite direction of the fixed base, and a first operating lever is connected to its extended end. The second snap-fit ​​member extends through the snap-fit ​​groove at one end facing the opposite direction of the fixed base, and a second operating rod is connected to its extended end. The first operating lever is used to drive the clamping part to rotate back and forth; The second operating lever is used to drive the tensioning part to rotate back and forth.

7. A sanding machine according to claim 6, characterized in that, The clamping part and the tensioning part are located on the same side in the front-rear direction of the fixed base; The first operating lever and the second operating lever are located on the same side in the front-rear direction of the fixed base and are connected together to the operating handle; The operating handle is used to drive the clamping part and the tensioning part to rotate together via the first operating lever and the second operating lever.

8. A sander according to claim 7, characterized in that, During the process of the operating handle driving the clamping part and the tensioning part to rotate together via the first operating rod and the second operating rod, the rotation angle between the clamping part and the bottom of the clamping groove is smaller than the rotation angle between the tensioning part and the bottom of the tensioning groove, so that when the clamping part just touches the bottom of the clamping groove, there is a gap between the tensioning part and the bottom of the tensioning groove.

9. A sander according to claim 2, characterized in that, A limiting screw is provided at the upper end of the snap-fit ​​base and near the snap-fit ​​groove, with the head of the limiting screw located directly above the snap-fit ​​groove.

10. A sander according to claim 5, characterized in that, The first adapter and the second adapter are arranged vertically at intervals.

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