A double-frame double-sided wide-band sander

Abstract

This application relates to the field of sanding machine technology, and more specifically to a double-sanding frame double-sided wide-band sander, comprising: a base assembly, a feeding assembly, and a sanding belt assembly. The base assembly includes an upper seat and a lower seat, with the upper seat being raised and lowered above the lower seat. The feeding assembly includes a first feeding structure and a second feeding structure, both of which are horizontally arranged on the lower seat and spaced a predetermined distance apart in the length direction. The sanding belt assembly is located between the first and second feeding structures and includes a first sanding belt and a second sanding belt, which are respectively disposed on the lower seat and the upper seat. The first sanding belt has a first fine-tuning structure between it and the lower seat, and the second sanding belt has a second fine-tuning structure between it and the upper seat. This utility model achieves the advantages of fine-tuning the position of the sanding belt and delaying the frequency of sanding belt replacement by finely adjusting the height of the first and second sanding belts through the first and second fine-tuning structures.

Description

Technical Field

[0001] This application relates to the field of sanding machine technology, and more specifically to a double-sand frame double-sided wide-band sander. Background Technology

[0002] A wide-belt sander is a surface processing device that uses a wide-width annular sanding belt as the core grinding medium and drives the sanding belt to rotate at high speed by an electric motor to polish the surface of the workpiece.

[0003] A double-frame, double-sided wide-band sander is available, comprising an upper frame, a lower frame, a feeding structure, a first sanding belt, and a second sanding belt. The feeding mechanism is located between the upper frame and the lower frame. The first sanding belt and the second sanding belt are respectively mounted on the upper frame and the lower frame. During use, material is fed in through the feeding structure, and the upper and lower surfaces of the material are contacted by the first sanding belt and the second sanding belt, respectively. However, after long-term use, the first sanding belt and the second sanding belt may wear and become thin. Replacing the first sanding belt and the second sanding belt is wasteful, but because the positions of the first sanding belt and the second sanding belt cannot be finely adjusted, the error during material sanding is relatively large.

[0004] Therefore, there is a need for a dual-frame, double-sided wide-band sander that allows for fine-tuning of the sanding belt position and delays the frequency of sanding belt replacement. Summary of the Invention

[0005] The main objective of this application is to provide a double-frame double-sided wide-band sander, wherein the double-frame double-sided wide-band sander includes a base assembly, a feeding assembly, and a sanding belt assembly. The base assembly includes an upper seat and a lower seat, with the upper seat being raised and lowered above the lower seat. The feeding assembly includes a first feeding structure and a second feeding structure, both of which are horizontally arranged on the lower seat and spaced a predetermined distance apart in the length direction. The sanding belt assembly is located between the first and second feeding structures and includes a first sanding belt and a second sanding belt, which are respectively disposed on the lower seat and the upper seat. A first fine-tuning structure is provided between the first sanding belt and the lower seat, and a second fine-tuning structure is provided between the second sanding belt and the upper seat. The height of the first and second sanding belts can be finely adjusted through the first and second fine-tuning structures, which has the advantages of fine-tuning the sanding belt position and delaying the frequency of sanding belt replacement compared to the prior art.

[0006] Another objective of this application is to provide a double-frame double-sided wide-belt sander, wherein the lower base includes two fixed bases, a first connecting base, and a first lifting base. The two ends of the first connecting base are respectively fixedly connected to the two fixed bases. The first lifting base is lifted and lowered on the first connecting base. The first connecting base has a sliding groove. The first fine-tuning structure includes a lead screw and a slider. The lead screw is rotatably mounted on the first connecting base. The slider is helically connected to the lead screw and is slidably disposed in the sliding groove. The slider has a first inclined surface, and the first lifting base has a second inclined surface. The first inclined surface and the second inclined surface fit together to achieve fine-tuning of the height position of the first sanding belt.

[0007] To achieve at least one of the above-mentioned objectives, this application provides a double-frame double-sided wide-width sander, wherein the double-frame double-sided wide-width sander comprises: A seat assembly, comprising an upper seat and a lower seat, wherein the upper seat is vertically positioned above the lower seat; The feeding assembly includes a first feeding structure and a second feeding structure, both of which are horizontally arranged on the lower seat and are spaced a predetermined distance apart in the length direction. A sanding belt assembly is located between the first feeding structure and the second feeding structure. The sanding belt assembly includes a first sanding belt and a second sanding belt. The first sanding belt and the second sanding belt are respectively disposed on the lower seat and the upper seat. The first sanding belt and the lower seat have a first fine-tuning structure, and the second sanding belt and the upper seat have a second fine-tuning structure.

[0008] In one or more embodiments of this application, the lower seat includes two fixed seats, a first connecting seat, and a first lifting seat. The two ends of the first connecting seat are respectively fixedly connected to the two fixed seats. The first lifting seat is lifted and lowered on the first connecting seat. The first connecting seat has a sliding groove. The first fine-tuning structure includes a lead screw and a slider. The lead screw is rotatably mounted on the first connecting seat. The slider is helically connected to the lead screw and is slidably disposed in the sliding groove. The slider has a first inclined surface. The first lifting seat has a second inclined surface. The first inclined surface and the second inclined surface are in contact.

[0009] In one or more embodiments of this application, the upper seat includes two second lifting seats and a third lifting seat, the third lifting seat is located between the two second lifting seats, and the third lifting seat is flexibly mounted on the second lifting seats. The second fine-tuning structure includes two rotating shafts, both of which are rotatably mounted on the second lifting seats and located on both sides of the bottom of the second lifting seats. Each rotating shaft is provided with a cam, and the cam contacts the bottom surface of the third lifting seat.

[0010] In one or more embodiments of this application, the double-sand frame double-sided wide-band sander further includes a limiting assembly, which includes an upper limiting roller and a lower limiting roller. The lower limiting roller is rotatably mounted on the fixed base, and the upper limiting roller is liftable and rotatably mounted on the second lifting base.

[0011] In one or more embodiments of this application, the limiting assembly further includes a horizontal plate, a threaded component, a first guide rod, and a mounting base. The horizontal plate is fixedly connected to the lower base, one end of the first guide rod is fixedly connected to the horizontal plate, and the other end of the first guide rod passes through the mounting base. The upper limiting roller is rotatably mounted on the mounting base. The threaded component is threadedly connected to the horizontal plate, and the end of the threaded component near the mounting base has a ball head. The mounting base has a ball groove, and the ball head is rotatably placed in the ball groove.

[0012] In one or more embodiments of this application, one end of each of the rotating shafts extends out of the second lifting seat by a predetermined length, and the end of the rotating shaft extending out of the second lifting seat has a rotating disc, and the rotating disc is provided with a second bolt, which abuts against or separates from the second lifting seat.

[0013] In one or more embodiments of this application, the sanding belt assembly further includes two first rotating rollers and two second rotating rollers. The two first rotating rollers are respectively located inside the two ends of the first sanding belt and are rotatably mounted on the first lifting seat. The two second rotating rollers are respectively located inside the two ends of the second sanding belt and are rotatably mounted on the second lifting seat.

[0014] In one or more embodiments of this application, the double-sand frame double-sided wide-band sander further includes a support roller assembly, which includes a first support roller and a second support roller. The first support roller is rotatably mounted on the first lifting seat and passes through the first sanding belt and is in line contact with a first rotating roller. The second support roller is rotatably mounted on the third lifting seat and passes through the second sanding belt and is in line contact with a second rotating roller.

[0015] In one or more embodiments of this application, a first rotary drive device is fixedly installed on both the first lifting seat and the second lifting seat, and the rotating shaft of the first rotary drive device is connected to the first rotating roller or the second rotating roller.

[0016] In one or more embodiments of this application, both the first feeding structure and the second feeding structure include a plurality of third rotating rollers and a second rotating drive device. The third rotating rollers are rotatably mounted on the fixed base, and each of the third rotating rollers has chain teeth on one side and on the rotating shaft of the second rotating drive device. The chain teeth on the third rotating rollers and the chain teeth on the rotating shaft of the second rotating drive device are connected by a chain.

[0017] In this embodiment, the double-frame double-sided wide-band sander includes a base assembly, a feeding assembly, and a sanding belt assembly. The base assembly includes an upper seat and a lower seat, with the upper seat being raised and lowered above the lower seat. The feeding assembly includes a first feeding structure and a second feeding structure, both of which are horizontally arranged on the lower seat and spaced a predetermined distance apart in the length direction. The sanding belt assembly is located between the first and second feeding structures and includes a first sanding belt and a second sanding belt. The first and second sanding belts are respectively disposed on the lower seat and the upper seat, and a first fine-tuning structure is provided between the first sanding belt and the lower seat, while a second fine-tuning structure is provided between the second sanding belt and the upper seat. The heights of the first and second sanding belts can be finely adjusted using the first and second fine-tuning structures. Compared with the prior art, this method has the advantages of finely adjusting the sanding belt position and delaying the frequency of sanding belt replacement. Attached Figure Description

[0018] These and / or other aspects and advantages of this application will become clearer and more readily understood from the following detailed description of embodiments of this application taken in conjunction with the accompanying drawings, wherein: Figure 1 The figure shows a structural schematic diagram of a double-sand frame double-sided wide-band sander according to this application; Figure 2 The diagram illustrates the structure of the first fine-tuning structure. Figure 3 The diagram illustrates the structure of the second fine-tuning structure at a certain angle. Figure 4 The diagram shows... Figure 1 A magnified view of a portion of point C. Detailed Implementation

[0019] The terms and words used in the following specification and claims are not limited to their literal meaning, but are used solely by the inventors to enable a clear and consistent understanding of this application. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of this application is provided for illustrative purposes only and not for the purpose of limiting the application as defined in the appended claims and their equivalents.

[0020] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0021] While ordinal numbers such as "first," "second," etc., will be used to describe various components, there is no limitation on which components are used herein. The term is used only to distinguish one component from another. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component, without departing from the teachings of the utility model concept. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It will also be understood that the terms “comprising” and / or “having” as used in this specification specify the presence of the described features, numbers, steps, operations, components, elements or combinations thereof, without excluding the presence or addition of one or more other features, numbers, steps, operations, components, elements or groups thereof.

[0023] Schematic double-frame double-sided wide-band sander, for reference. Figures 1 to 4 According to a preferred embodiment of the present invention, a double-sand frame double-sided wide belt sander includes a base assembly 10, a feed assembly 20, and a sanding belt assembly 30.

[0024] Specifically, such as Figure 1As shown, the seat assembly 10 includes an upper seat 101 and a lower seat 102, with the upper seat 101 being raised and lowered above the lower seat 102. Additionally, the feeding assembly 20 includes a first feeding structure 201 and a second feeding structure 202, both horizontally arranged on the lower seat 102, and spaced a predetermined distance apart in the length direction. Furthermore, the sanding belt assembly 30 is located between the first feeding structure 201 and the second feeding structure 202. The sanding belt assembly 30 includes a first sanding belt 301 and a second sanding belt 302, respectively disposed on the lower seat 102 and the upper seat 101. A first fine-tuning structure 1021 is provided between the first sanding belt 301 and the lower seat 102, and a second fine-tuning structure 1011 is provided between the second sanding belt 302 and the upper seat 101.

[0025] It should be noted that during processing, the user places the material on the first feeding structure 201, which then feeds the material between the first sanding belt 301 and the second sanding belt 302. The first and second sanding belts 301 and 302 grind the upper and lower surfaces of the material. It should be pointed out that when one end of the material just contacts the second feeding structure 202, the other end remains in contact with the first feeding structure 201, allowing the material to be further moved along its original direction by the second feeding structure 202. Furthermore, when the first sanding belt 301 wears and becomes thin, the first fine-tuning structure 1021 can be adjusted to allow the first sanding belt 301 to... 01. Move upwards by a predetermined distance to compensate for the height loss due to the thinning of the first sanding belt 301. Similarly, when the second sanding belt 302 wears and thins, the second fine-tuning structure 1011 can be adjusted to move the second sanding belt 302 downwards by a predetermined distance to compensate for the height loss due to the thinning of the second sanding belt 302. This continues until the first sanding belt 301 and the second sanding belt 302 wear down to a predetermined thickness, at which point the first sanding belt 301 or the second sanding belt 302 can be replaced as a whole. It is evident that, by setting the first fine-tuning structure 1021 and the second fine-tuning structure 1011, this application has the advantage of being able to finely adjust the position of the sanding belt and delaying the frequency of sanding belt replacement compared to the prior art.

[0026] Furthermore, to specifically achieve fine-tuning of the height direction of the first sand belt 301, such as... Figure 1As shown, the lower seat 102 includes two fixed seats 1022, a first connecting seat 1023, and a first lifting seat 1024. The two ends of the first connecting seat 1023 are fixedly connected to the two fixed seats 1022 respectively. The first lifting seat 1024 is ellipsably disposed on the first connecting seat 1023. The first connecting seat 1023 has a sliding groove 10231. The first fine-tuning structure 1021 includes a lead screw 10211 and a slider 10212. The lead screw 10211 is rotatably mounted on the first connecting seat 1023. The slider 10212 is helically connected to the lead screw 10211 and is slidably disposed in the sliding groove 10231. The slider 10212 has a first inclined surface, and the first lifting seat 1024 has a second inclined surface 10241. The first inclined surface and the second inclined surface 10241 are in contact.

[0027] It should be noted that when the height of the first sanding belt 301 needs to be adjusted, the lead screw 10211 can be rotated. When the lead screw 10211 rotates circumferentially, the slider 10212 slides along the slide groove 10231. Since the first inclined surface is in contact with the second inclined surface 10241, when the slider 10212 slides, the first lifting seat 1024 moves upward or downward, causing the first sanding belt 301 to move upward or downward. In addition, to prevent the lead screw 10211 from rotating circumferentially without human intervention, one end of the lead screw 10211 extends out of the slide groove 10231. One end of the first connecting seat 1023 and the end of the lead screw 10211 extending out of the first connecting seat 1023 have a grip portion, and a stop bolt 10213 is screwed onto the grip portion. When the stop bolt 10213 is tightened and abuts against the end face of the first connecting seat 1023, the circumferential position of the lead screw 10211 is fixed. When it is necessary to rotate the lead screw 10211, the stop bolt 10213 is loosened and separated from the end face of the first connecting seat 1023, so that the lead screw 10211 can be rotated.

[0028] Furthermore, to achieve fine-tuning in the height direction of the second sand belt 302, such as... Figure 1As shown, the upper seat 101 includes two second lifting seats 1012 and a third lifting seat 1013. The third lifting seat 1013 is located between the two second lifting seats 1012 and is flexibly mounted on the second lifting seats 1012. The second fine-tuning structure 1011 includes two rotating shafts 10111. Both rotating shafts 10111 are rotatably mounted on the second lifting seats 1012 and located on both sides of the bottom of the second lifting seats 1012. Each rotating shaft 10111 is provided with a cam 10112. The cam 10112 contacts the bottom surface of the third lifting seat 1013. The cam 10112 is fixedly connected to the rotating shaft 10111. The fixed connection method includes, but is not limited to, welding.

[0029] It should be noted that by rotating the rotating shaft 10111, the cam 10112 rotates circumferentially in sync, thereby changing the absolute position of the highest point of the cam 10112 and causing the overall height of the third lifting seat 1013 supported by the cam 10112 to move upward or downward, which in turn drives the second sanding belt 302 to move upward or downward.

[0030] Similarly, to limit the circumferential rotation of the rotating shaft 10111 under non-human-induced conditions, such as Figure 4 As shown, one end of each of the rotating shafts 10111 extends out of the second lifting seat 1012 by a predetermined length. The end of the rotating shaft 10111 extending out of the second lifting seat 1012 has a rotating disc 10113. The rotating disc 10113 is provided with a second bolt, which abuts against or separates from the second lifting seat 1012.

[0031] It should be noted that when the second bolt abuts against the second lifting seat 1012, the rotating disc 10113 is difficult to rotate circumferentially. Conversely, when it is necessary to rotate the rotating shaft 10111, the second bolt is loosened and the second bolt is separated from the second lifting seat 1012.

[0032] Furthermore, to prevent significant vertical movement of materials during grinding or feeding, such as Figure 1 and Figure 4 As shown, the double-sand frame double-sided wide-band sander also includes a limiting assembly 40, which includes an upper limiting roller 401 and a lower limiting roller 402. The lower limiting roller 402 is rotatably mounted on the fixed base 1022, and the upper limiting roller 401 is liftable and rotatably mounted on the second lifting base 1012.

[0033] It should be noted that when the material moves along the first feeding structure 201 and the second feeding structure 202, the upper limit roller 401 and the lower limit roller 402 contact the upper and lower surfaces of the material respectively, restricting the material from moving significantly in the height direction.

[0034] Furthermore, to enable the upper limit roller 401 to be vertically and flexibly mounted on the second lifting seat 1012, as follows: Figure 4 As shown, the limiting assembly 40 further includes a horizontal plate 403, a threaded component 404, a first guide rod 405, and a mounting base 406. The horizontal plate 403 is fixedly connected to the lower base 102. One end of the first guide rod 405 is fixedly connected to the horizontal plate 403, and the other end of the first guide rod 405 passes through the mounting base 406. The upper limit roller 401 is rotatably mounted on the mounting base 406. The threaded component 404 is threadedly connected to the horizontal plate 403, and the end of the threaded component 404 near the mounting base 406 has a ball head 4041. The mounting base 406 has a ball groove 4061, and the ball head 4041 is rotatably placed in the ball groove 4061.

[0035] It should be noted that before the ball head 4041 is inserted, the opening of the ball groove 4061 is greater than or equal to the diameter of the ball head 4041. When at least half of the ball head 4041 is inserted into the ball groove 4061, the two semicircular rings are fixedly connected to the mounting base 406, and the inner hole of the ring formed by splicing the two semicircular rings is smaller than the radius of the ball head 4041. This allows the ball head 4041 to rotate circumferentially without causing the mounting base 406 to rotate circumferentially when the threaded component 404 rotates circumferentially. Furthermore, when the threaded component 404 moves axially up and down, the mounting base 406 moves axially up and down accordingly. By making the upper limit roller 401 height-adjustable, the height of the upper limit roller 401 near the first feeding structure 201 can be higher, while the height of the upper limit roller 401 near the second feeding structure 202 can be lower, to accommodate the heights of unpolished and polished materials respectively.

[0036] Furthermore, to achieve the movement of the belts of the first sanding belt 301 and the second sanding belt 302, such as... Figure 1 and Figure 3 As shown, the sanding belt assembly 30 further includes two first rotating rollers 303 and two second rotating rollers 304. The two first rotating rollers 303 are respectively located inside the two ends of the first sanding belt 301, and the first rotating rollers 303 are rotatably mounted on the first lifting seat 1024. The two second rotating rollers 304 are respectively located inside the two ends of the second sanding belt 302, and the second rotating rollers 304 are rotatably mounted on the second lifting seat 1012.

[0037] It should be noted that when the first rotating roller 303 or the second rotating roller 304 rotates circumferentially, the belt of the first sanding belt 301 or the second sanding belt 302 moves in a circular motion.

[0038] In addition, to achieve circumferential rotation of the first rotating roller 303 or the second rotating roller 304, such as Figure 3 As shown, a first rotary drive device 305 is fixedly installed on both the first lifting seat 1024 and the second lifting seat 1012, and the rotating shaft 10111 of the first rotary drive device 305 is connected to the first rotating roller 303 or the second rotating roller 304.

[0039] Furthermore, to facilitate the disassembly of the first sanding belt 301 or the second sanding belt 302 while also providing effective support for the first rotating roller 303 or the second rotating roller 304, such as... Figure 1 and Figure 3 As shown, the double-sand frame double-sided wide-band sander also includes a support roller assembly 50, which includes a first support roller 501 and a second support roller 502. The first support roller 501 is rotatably mounted on the first lifting seat 1024 and passes through the first sanding belt 301 and is in line contact with a first rotating roller 303. The second support roller 502 is rotatably mounted on the third lifting seat 1013 and passes through the second sanding belt 302 and is in line contact with a second rotating roller 304.

[0040] Furthermore, to achieve the actions of the first delivery structure 201 and the second delivery structure 202, as follows: Figure 1 As shown, both the first feeding structure 201 and the second feeding structure 202 include a plurality of third rotating rollers 2011. The third rotating rollers 2011 are rotatably mounted on the fixed base 1022, and each of the third rotating rollers 2011 has chain teeth on one side and on the rotating shaft 10111 of the second rotating drive device. The chain teeth on the third rotating rollers 2011 and the chain teeth on the rotating shaft 10111 of the second rotating drive device are connected by a chain.

[0041] It should be noted that when the shaft 10111 of the second rotary drive device is activated, the chain is activated and drives each of the third rotating rollers 2011 to rotate circumferentially in one direction.

[0042] In summary, the dual-frame double-sided wide-band sander described in the embodiments of this application is explained, which provides advantages such as adjustable sanding belt position and delayed sanding belt replacement frequency.

[0043] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The function and structural principle of the present invention have been shown and explained in the embodiments, and any modifications or variations may be made to the implementation of the present invention without departing from these principles.

Claims

1. A double-sand-frame double-sided wide-band sander, characterized in that: The double-frame, double-sided wide-band sander includes A seat assembly, comprising an upper seat and a lower seat, wherein the upper seat is vertically positioned above the lower seat; The feeding assembly includes a first feeding structure and a second feeding structure, both of which are horizontally arranged on the lower seat and are spaced a predetermined distance apart in the length direction. A sanding belt assembly is located between the first feeding structure and the second feeding structure. The sanding belt assembly includes a first sanding belt and a second sanding belt. The first sanding belt and the second sanding belt are respectively disposed on the lower seat and the upper seat. The first sanding belt and the lower seat have a first fine-tuning structure, and the second sanding belt and the upper seat have a second fine-tuning structure.

2. The double-sand-frame double-sided wide-band sander according to claim 1, characterized in that: The lower seat includes two fixed seats, a first connecting seat, and a first lifting seat. The two ends of the first connecting seat are fixedly connected to the two fixed seats respectively. The first lifting seat is lifted and lowered on the first connecting seat. The first connecting seat has a sliding groove. The first fine-tuning structure includes a lead screw and a slider. The lead screw is rotatably mounted on the first connecting seat. The slider is helically connected to the lead screw and is slidably disposed in the sliding groove. The slider has a first inclined surface. The first lifting seat has a second inclined surface. The first inclined surface and the second inclined surface are in contact.

3. The double-sand-frame double-sided wide-band sander according to claim 2, characterized in that: The upper seat includes two second lifting seats and a third lifting seat. The third lifting seat is located between the two second lifting seats and is flexibly mounted on the second lifting seats. The second fine-tuning structure includes two rotating shafts. Both rotating shafts are rotatably mounted on the second lifting seats and located on both sides of the bottom of the second lifting seats. Each rotating shaft is provided with a cam, and the cam contacts the bottom surface of the third lifting seat.

4. The double-sand-frame double-sided wide-band sander according to claim 3, characterized in that: The double-sand frame double-sided wide-band sander also includes a limiting assembly, which includes an upper limiting roller and a lower limiting roller. The lower limiting roller is rotatably mounted on the fixed base, and the upper limiting roller is liftable and rotatably mounted on the second lifting base.

5. The double-sand-frame double-sided wide-band sander according to claim 4, characterized in that: The limiting assembly further includes a horizontal plate, a threaded component, a first guide rod, and a mounting base. The horizontal plate is fixedly connected to the lower base. One end of the first guide rod is fixedly connected to the horizontal plate, and the other end of the first guide rod passes through the mounting base. The upper limit roller is rotatably mounted on the mounting base. The threaded component is threadedly connected to the horizontal plate, and the end of the threaded component near the mounting base has a ball head. The mounting base has a ball groove, and the ball head is rotatably placed in the ball groove.

6. The double-sand-frame double-sided wide-band sander according to claim 3, characterized in that: One end of each of the rotating shafts extends out of the second lifting seat by a predetermined length. The end of the rotating shaft extending out of the second lifting seat has a rotating disc. The rotating disc is provided with a second bolt, which abuts against or separates from the second lifting seat.

7. The double-sand-frame double-sided wide-band sander according to claim 3, characterized in that: The sanding belt assembly further includes two first rotating rollers and two second rotating rollers. The two first rotating rollers are located inside the two ends of the first sanding belt and are rotatably mounted on the first lifting seat. The two second rotating rollers are located inside the two ends of the second sanding belt and are rotatably mounted on the second lifting seat.

8. The double-sand-frame double-sided wide-band sander according to claim 7, characterized in that: The double-sand frame double-sided wide-band sander also includes a support roller assembly, which includes a first support roller and a second support roller. The first support roller is rotatably mounted on the first lifting seat and passes through the first sanding belt and is in line contact with a first rotating roller. The second support roller is rotatably mounted on the third lifting seat and passes through the second sanding belt and is in line contact with a second rotating roller.

9. The double-sand-frame double-sided wide-band sander according to claim 8, characterized in that: A first rotary drive device is fixedly installed on both the first lifting seat and the second lifting seat, and the rotating shaft of the first rotary drive device is connected to the first rotating roller or the second rotating roller.

10. The double-sand-frame double-sided wide-band sander according to claim 3, characterized in that: Both the first feeding structure and the second feeding structure include a plurality of third rotating rollers and a second rotating drive device. The third rotating rollers are rotatably mounted on the fixed base, and each of the third rotating rollers has chain teeth on one side and on the rotating shaft of the second rotating drive device. The chain teeth on the third rotating rollers and the chain teeth on the rotating shaft of the second rotating drive device are connected by a chain.

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