CN216657459U

CN216657459U - Abrasive belt grinding machine

Info

Publication number: CN216657459U
Application number: CN202122821122.5U
Authority: CN
Inventors: 刘钦毅
Original assignee: Quanzhou Siji Machinery Co ltd
Current assignee: Quanzhou Siji Machinery Co ltd
Priority date: 2021-11-17
Filing date: 2021-11-17
Publication date: 2022-06-03
Anticipated expiration: 2031-11-17

Abstract

The utility model provides an abrasive belt sander which comprises a rack, a sanding component arranged on the rack, a motor mounting rack rotationally connected to the rack and a motor arranged on the motor mounting rack, wherein the rotating shafts of the motor mounting rack and the rack are arranged perpendicular to the output of the motor, the sanding component comprises a grinding wheel directly or indirectly rotationally connected to the rack, a driving wheel arranged corresponding to the grinding wheel is arranged on an output shaft of the motor, and abrasive belts are wound on the driving wheel and the grinding wheel. Because the motor mounting bracket rotates to be connected in the frame, and the drive wheel is installed on the output shaft of motor, the relative angle of accessible swing motor mounting bracket and frame comes the angle of swing drive wheel to make the abrasive band skew on the drive wheel, realize rectifying, need not to set up independent mechanism of rectifying, simple structure and equipment cost are lower relatively.

Description

Abrasive belt grinding machine

Technical Field

The utility model relates to a grinding device, in particular to a sand belt grinding machine.

Background

An abrasive belt grinding machine, also called as an abrasive belt machine or a polishing machine, is a belt type grinding device and is widely applied to grinding of various metal and stone products. In order to prevent the abrasive belt from deviating from the grinding wheel (also called a belt wheel) during use, a deviation-correcting mechanism is usually disposed on the abrasive belt grinding machine, for example, a three-point deviation-correcting mechanism of an abrasive belt machine disclosed in chinese patent application publication No. CN110450025A, or a deviation-correcting mechanism of an abrasive belt disclosed in chinese utility model publication No. CN209632717U, etc., however, such a deviation-correcting mechanism is usually an independent mechanism, which increases the structural complexity of the abrasive belt grinding machine and increases the equipment cost of the abrasive belt grinding machine.

In addition, traditional abrasive band polisher, its main part that is used for supporting abrasive wheel, what adopt usually is cast fashioned supporting seat, and this type of cast fashioned supporting seat need make the mould earlier before the shaping, still need carry out machining after the shaping, just can be used for the equipment of abrasive band machine afterwards, and production cycle is long and the cost is relatively higher.

In view of the above, the applicant has made intensive studies to solve the above problems and has made the present invention.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a belt sander with simple structure and relatively low equipment cost.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides an abrasive band polisher, includes the frame, installs polishing subassembly in the frame, rotate to be connected motor mounting bracket in the frame and install motor on the motor mounting bracket, motor mounting bracket with the axis of rotation of frame with the output of motor is arranged perpendicularly, polishing subassembly includes that direct or indirect rotation is connected grinding wheel in the frame, install on the output shaft of motor with the grinding wheel corresponds the drive wheel of arranging, the drive wheel with around being equipped with the abrasive band on the grinding wheel.

As an improvement of the present invention, a swing handle for driving the motor mounting rack to swing is fixedly connected or integrally connected to the motor mounting rack.

As an improvement of the present invention, the machine frame includes a bottom plate, and a first vertical plate, a second vertical plate, and a third vertical plate which are respectively tenoned on the bottom plate and are respectively arranged perpendicular to the bottom plate, the first vertical plate and the second vertical plate are arranged parallel to each other, the third vertical plate is located between the first vertical plate and the second vertical plate, one end of the third vertical plate is tenoned on the first vertical plate, the other end is tenoned on the second vertical plate, the upper end of the first vertical plate is rotatably connected with a turnover plate arranged parallel to the first vertical plate, a locking structure for relatively fixedly connecting the turnover plate and the first vertical plate is arranged between the turnover plate and the first vertical plate, a main body plate which is arranged perpendicular to the turnover plate is tenoned on the turnover plate, a follower plate which is rotatably connected on the second vertical plate and two rail plates which are arranged parallel to each other are tenoned on the main body plate, two be formed with the spout between the track board, sliding connection has the slide bar on the spout, the subassembly of polishing is installed the one end of slide bar, motor mounting bracket rotates to be connected on the main part board.

As an improvement of the utility model, the locking structure comprises a third arc-shaped through groove formed in the turnover plate, a locking threaded hole formed in the first vertical plate, and a first locking bolt inserted into the third arc-shaped through groove and spirally connected with the locking threaded hole, a rotating shaft between the turnover plate and the first vertical plate is coaxially arranged with a central shaft of the third arc-shaped through groove, and a nut of the first locking bolt abuts against one side of the turnover plate, which is far away from the first vertical plate.

As an improvement of the utility model, the turnover plate is a sector plate, a rotating shaft between the turnover plate and the first vertical plate is coaxially arranged with a central shaft of the arc-shaped surface of the turnover plate, the locking structure comprises at least one clamping groove formed in the arc-shaped surface of the turnover plate, the first vertical plate is rotatably connected with a locking rod, one end of the locking rod is provided with a clamping block matched with the clamping groove, and a rod body of the locking rod is spirally connected with a second locking bolt abutted against the first vertical plate.

As an improvement of the utility model, a non-slip plate is joggled between the two track plates, and a non-slip bolt which is propped against the sliding rod is spirally connected on the non-slip plate.

As an improvement of the present invention, an arc ratchet bar arranged parallel to the main body plate is fixedly or integrally connected to the main body plate, an adjusting lever is rotatably connected to the main body plate, a rotating shaft between the adjusting lever and the main body plate is coaxially arranged with a central axis of the arc ratchet bar, a ratchet matched with the arc ratchet bar is rotatably connected to the adjusting lever, an operating handle is fixedly or integrally connected to the ratchet, a supporting rod is further fixedly connected to the adjusting lever, and a tensioning wheel abutting against the abrasive belt is rotatably connected to the supporting rod.

As an improvement of the utility model, the grinding component comprises a supporting plate arranged on the machine frame, a first grinding wheel rotatably connected to one end of the supporting plate and a grinding wheel bracket rotatably connected to the other end of the supporting plate, one end of the grinding wheel bracket is provided with a fastening threaded hole, the other end of the grinding wheel bracket is detachably and rotatably connected with a second grinding wheel, the outer diameter of the second grinding wheel is less than or equal to that of the first grinding wheel, the central axis of the first grinding wheel and the central axis of the second grinding wheel are arranged in parallel, a first arc-shaped through groove is formed in the position, corresponding to the locking threaded hole, of the support plate, a rotating shaft between the grinding wheel bracket and the supporting plate is coaxially arranged with the central shaft of the first arc-shaped through groove, and a locking bolt in threaded connection with the fastening threaded hole is inserted into the first arc-shaped through groove, and a nut of the fastening bolt abuts against one side, far away from the grinding wheel support, of the support plate.

As an improvement of the present invention, the first grinding wheel is a rubber wheel.

As an improvement of the present invention, the polishing assembly further includes a flat polishing plate, a supporting arm detachably and fixedly connected to the supporting plate is fixedly connected to the flat polishing plate, the flat polishing plate is located between the first polishing wheel and the second polishing wheel, a side surface of the flat polishing plate, which is away from the supporting arm, is used as a reference surface, the flat polishing plate, the first polishing wheel and the second polishing wheel are located on a same side of the reference surface, and the first polishing wheel and the second polishing wheel are tangent to the reference surface.

By adopting the technical scheme, the utility model has the following beneficial effects:

1. because the motor mounting bracket rotates to be connected in the frame, and the drive wheel is installed on the output shaft of motor, the relative angle of accessible swing motor mounting bracket and frame comes the angle of swing drive wheel to make the abrasive band skew on the drive wheel, realize rectifying, need not to set up independent mechanism of rectifying, simple structure and equipment cost are lower relatively.

2. The frame provided by the utility model adopts the plate joggle structure, so that a steel plate with a preset thickness can be directly purchased for cutting and drilling during production, the frame can be used for assembling the abrasive belt machine, the production period is short, and the cost is relatively low.

3. The grinding assembly is convenient for grinding concave workpieces with different angles by arranging the large grinding wheel and the small grinding wheel, the small grinding wheels with different sizes can be conveniently replaced by arranging the grinding wheel support under the condition that the whole grinding assembly is not replaced, and meanwhile, the grinding angle can be conveniently and quickly adjusted due to the fact that the angle of the grinding wheel support can be adjusted, and the use is convenient.

4. Set up first emery wheel into the rubber wheel, can realize the rolling friction between abrasive band and the emery wheel, and the shock attenuation effect of usable rubber improves the effect of polishing and the efficiency of polishing.

5. Through setting up flat grinding plate, be convenient for polish to the plane, simultaneously because the angularly adjustable of emery wheel support, need not to adjust the position of flat grinding plate after changing the second emery wheel, it is comparatively convenient to use.

Drawings

FIG. 1 is a schematic structural view of a sanding belt sander in an embodiment;

FIG. 2 is a schematic structural view of another perspective of the sanding belt sander in the embodiment;

fig. 3 is a partial enlargement of the position a in fig. 1.

The designations in the figures correspond to the following:

10-a frame; 11-a base plate;

12-a first riser; 13-a second vertical plate;

14-a third vertical plate; 15-turning over the board;

16-a body plate; 17-a follower plate;

18-a track slab; 19-a slide bar;

20-grinding the assembly; 21-a support plate;

22-a first grinding wheel; 23-a grinding wheel holder;

24-a second grinding wheel; 25-a first arc-shaped through groove;

26-a rotating rod; 27-a bearing;

30-a motor mounting bracket; 31-a swing handle;

40-a motor; 41-driving wheels;

50-a locking structure; 51-a card slot;

52-a locking lever; 53-a fixture block;

54-a third arc-shaped through slot; 55-locking threaded holes;

61-a slip-resistant plate; 62-a second arc-shaped through groove;

63-mounting holes; 64-arc ratchet bar;

65-adjusting the rod; 66-ratchet;

67-operating handle; 68-a tension wheel;

69-strut.

Detailed Description

The utility model is further described with reference to the following figures and specific embodiments.

As shown in fig. 1-3, the present embodiment provides a sander, which is essentially a belt sander, and comprises a frame 10, a sanding unit 20 mounted on the frame 10 (i.e. the sanding unit 20 is connected to the frame 10), a motor mounting bracket 30 rotatably connected to the frame 10, and a motor 40 mounted on the motor mounting bracket 30, wherein the motor 40 is a motor used in a conventional belt sander and is commercially available.

The machine frame 10 may be a conventional casting machine frame, and this embodiment provides a machine frame 10 with a plate-type joggle structure, where the machine frame 10 includes a bottom plate 11 arranged horizontally, and a first vertical plate 12, a second vertical plate 13, and a third vertical plate 14 joggled on the bottom plate 11 and arranged perpendicular to the bottom plate 11, that is, each vertical plate is arranged on the bottom plate 11 vertically, where the first vertical plate 12 and the second vertical plate 13 are arranged in parallel, the third vertical plate 14 is located between the first vertical plate 12 and the second vertical plate 13, and one end of the third vertical plate 14 is joggled on the first vertical plate 12, and the other end is joggled on the second vertical plate 13, so that an i-shaped structure can be formed, and the stability of the machine frame 10 is ensured. The upper end of the first vertical plate 12 is rotatably connected with a turning plate 15 arranged in parallel with the first vertical plate 12, preferably, in this embodiment, the turning plate 15 is a sector plate, and the rotation axis between the turning plate 15 and the first vertical plate 12 is arranged coaxially with the central axis of the arc-shaped surface of the turning plate 15 (i.e. the central axis of the sector plate).

Be provided with between returning face plate 15 and the first riser 12 and be used for the relative fixed connection's of returning face plate 15 and first riser 12 locking structure 50, this embodiment provides two kinds of locking structures 50, can the alternative use, also can use together in order to realize dual locking, and two kinds of locking structures 50 use together in this embodiment. First locking structure 50 includes at least one draw-in groove 51 of seting up on the arcwall face of returning face plate 15, it is connected with locking pole 52 to rotate on first riser 12, the one end of locking pole 52 is provided with draw-in groove 51 complex fixture block 53, and screwed connection has the second locking bolt (not shown in the figure) of propping up on first riser 12 on the pole body of locking pole 52, in the time of the use, through alternating fixture block 53 and realizing the locking in draw-in groove 51, and it compresses tightly first riser 12 in order to avoid fixture block 53 to drop from draw-in groove 51 to screw up the second locking bolt, when needing adjustment returning face plate 15's position, then unscrew the second locking bolt, and take out fixture block 53 from draw-in groove 51 through locking pole 52. The second locking structure 50 comprises a third arc-shaped through groove 54 formed in the turnover plate 15, a locking threaded hole 55 formed in the first vertical plate 12, and a first locking bolt (not shown in the figure) inserted in the third arc-shaped through groove 54 and spirally connected with the locking threaded hole 55, wherein a rotating shaft between the turnover plate 15 and the first vertical plate 12 is coaxially arranged with a central shaft of the third arc-shaped through groove 54, and a nut of the first locking bolt abuts against one side, far away from the first vertical plate 12, of the turnover plate 15; during the use, realize the locking through screwing up first locking bolt, when needing the position of adjustment returning face plate 15, then unscrew first locking bolt and can rotate returning face plate 15.

The main body plate 16 vertically arranged with the turnover plate 15 is connected to the turnover plate 15 in a joggled mode, so that the main body plate 16 can rotate along with the turnover plate 15, the follow-up plate 17 rotatably connected to the second vertical plate 13 and the two track plates 18 arranged in parallel are connected to the main body plate 16 in a joggled mode, and the two vertical plates can both support the main body plate 16 due to the arrangement of the follow-up plate 17. A sliding groove is horizontally arranged between the two track plates 18, a sliding rod 19 with one end penetrating out of the sliding groove is connected to the sliding groove in a sliding mode, in addition, a sliding-stopping plate 61 which is arranged in parallel with the main body plate 16 is connected between the two track plates 18 in a jogged mode, and a sliding-stopping bolt (not shown in the figure) which abuts against the sliding rod 19 is connected to the sliding-stopping plate 61 in a spiral mode, so that the sliding rod 19 is fastened in the sliding groove when the sliding-stopping device is used, and the sliding rod 19 is prevented from sliding when the sliding-stopping device is used.

Grinding component 20 is installed on the one end that slide bar 19 wore out the spout, and motor mounting bracket 30 rotates to be connected on the one end that grinding component 30 was kept away from to main part board 16. The motor mounting frame 30 and the rotating shaft of the frame 10 are arranged perpendicular to the output of the motor 40, and preferably, a swing handle 31 for driving the motor mounting frame 30 to swing is fixedly connected or integrally connected to the motor mounting frame 30. In addition, the grinding assembly 20 includes a grinding wheel directly or indirectly rotatably connected to the frame 10, a driving wheel 41 is mounted on an output shaft of the motor 40 and is disposed corresponding to the grinding wheel, and an abrasive belt (not shown) is wound around the driving wheel 41 and the grinding wheel. In this way, the driving wheel 41 can be driven to swing through the swing handle 31, so that the abrasive belt arranged on the driving wheel 41 is displaced, and thus, in the rotation process of the abrasive belt, the relative position between the abrasive belt and the grinding wheel can also be deviated, and further deviation rectification is realized.

The grinding assembly 20 with the grinding wheel can be a conventional grinding assembly, preferably, in order to improve the applicability and the use convenience of the grinding assembly, the embodiment provides the grinding assembly 20 with relatively more grinding functions, and the grinding assembly 20 can be matched with the grinding machine in the embodiment, can also be used in other grinding equipment, and even can be sold separately. Specifically, the grinding assembly 20 includes a support plate 21 mounted on the slide rod 19 of the frame 10, a first grinding wheel 22 rotatably connected to one end of the support plate 21, and a grinding wheel support 23 rotatably connected to the other end of the support plate 21, wherein the support plate 21 is arranged perpendicular to the slide rod 19, one end of the grinding wheel support 23 is provided with a fastening threaded hole, the other end is detachably and rotatably connected with a second grinding wheel 24, an outer diameter of the second grinding wheel 24 is smaller than or equal to an outer diameter of the first grinding wheel 22, a central axis of the first grinding wheel 22 is arranged in parallel with a central axis of the second grinding wheel 24, and the grinding belt is simultaneously wound on the drive wheel 41, the first grinding wheel 22 and the second grinding wheel 24 and covers the drive wheel 41, the first grinding wheel 22 and the second grinding wheel 24 (i.e., the drive wheel 41, the first grinding wheel 22 and the second grinding wheel 24 are located in a space surrounded by the grinding belt). Further, in the present embodiment, the first grinding wheel 22 is a rubber wheel.

The first arc-shaped through groove 25 is formed in the position, corresponding to the locking threaded hole, of the support plate 21, the rotating shaft between the grinding wheel support 23 and the support plate 21 is coaxially arranged with the central shaft of the first arc-shaped through groove 25, a locking bolt (not shown in the figure) in threaded connection with the fastening threaded hole penetrates through the first arc-shaped through groove 25, and the nut of the fastening bolt abuts against one side, far away from the grinding wheel support 23, of the support plate 21, so that the relative position between the grinding wheel support 23 and the support plate 21 can be adjusted conveniently.

The specific connection structure between the second grinding wheel 24 and the grinding wheel support 23 may be a conventional structure, in this embodiment, a rotating rod 26 coaxially arranged with the second grinding wheel 24 is fixedly connected or integrally connected to the second grinding wheel 24, two ends of the rotating rod 26 are respectively sleeved with bearings 27, and the second grinding wheel 24 is located between the two bearings 27; the one end that fastening screw hole was kept away from to emery wheel support 23 has two mutual parallel arrangement's installation arm, and each installation arm is kept away from fastening screw hole's one end offer with bearing complex spread groove, and two bearings are one to one inlayed and are established in two spread grooves, utilize the pressure that the abrasive band produced around second emery wheel 24 to compress tightly the bearing in the spread groove that corresponds, be convenient for like this according to the actual needs of polishing change second emery wheel 24, and change speed is very fast relatively. It should be noted that when the diameter of the second grinding wheel 24 is too small, the bearing 27 may not be provided, and in addition, the bearing 27 is preferably a flanged bearing, and in this case, the rotating rod 26 is preferably a stepped shaft so that the axial play of the second grinding wheel 24 is realized by the stepped surface of the stepped shaft.

Further, the grinding assembly 20 further includes a flat grinding plate 58, a supporting arm 59 detachably and fixedly connected to the supporting plate 21 is fixedly connected to the flat grinding plate 58, and a specific detachable connection structure between the two can be a conventional structure, such as a bolt connection or a clamping connection, and will not be described in detail herein. Flat grinding plate 48 is located between first grinding wheel 22 and second grinding wheel 24, the side of flat grinding plate 58 away from support arm 59 is used as a reference surface, flat grinding plate 58, first grinding wheel 22 and second grinding wheel 24 are all located on the same side of the reference surface, and first grinding wheel 22 and second grinding wheel 24 are all tangent to the reference surface, so that after the abrasive belt is wound on first grinding wheel 22 and second grinding wheel 24, the working section of the abrasive belt located between first grinding wheel 22 and second grinding wheel 24 can be arranged in parallel with flat grinding plate 48 and abut against flat grinding plate 48. It should be noted that the reference plane is a virtual plane, and since the grinding wheel holder 23 is adjustable in position, the working section of the sanding belt does not need to be arranged parallel to the flat grinding plate 48 in the non-use state or the state in which the flat grinding plate 58 is detached.

In order to adjust the angle between the polishing assembly 20 and the slide rod 19, in this embodiment, a mounting hole 63 for matching with the slide rod 19 of the polishing machine and a second arc-shaped through groove 62 having a central axis coaxial with the mounting hole 63 are formed in the support plate 21, a plug pin connected to the slide rod 19 is inserted into the mounting hole 63, so as to rotatably connect the support plate 21 and the slide rod 19, an adjusting bolt (not shown in the figure) spirally connected to the slide rod 19 is inserted into the second arc-shaped through groove 62, and a nut of the adjusting bolt abuts against a side of the support plate 21 away from the slide rod 19, so that the adjusting bolt can be screwed to fixedly connect the support plate 21 and the slide rod 19, and the relative position between the support plate 21 and the slide rod 19 can be adjusted after the adjusting bolt is screwed.

In addition, an arc ratchet bar 64 arranged in parallel with the main body plate 16 is fixedly connected or integrally connected to the main body plate 16, an adjusting rod 65 is rotatably connected to the main body plate 16, a rotating shaft between the adjusting rod 65 and the main body plate 16 is coaxially arranged with a central shaft of the arc ratchet bar 64, a ratchet 66 matched with the arc ratchet bar 64 is rotatably connected to the adjusting rod 64, and an operating handle 67 is fixedly connected or integrally connected to the ratchet 66 so as to drive the ratchet 66 to move. A supporting rod 69 is fixedly connected to the adjusting rod 66, and a tension wheel 68 abutting against the abrasive belt is rotatably connected to the supporting rod 69, and specifically, the tension wheel 68 is located in a space surrounded by the abrasive belt. The supporting rod 67 and the adjusting rod 66 are respectively located on two sides of the main body plate 16, the supporting rod 69 and the adjusting rod 66 are fixedly connected to the same pin, and the pin is inserted into the main body plate 16 to be rotatably connected with the main body plate 16, so that the stress is balanced. When the abrasive belt tensioning device is used, the adjusting rod 65 is swung upwards to drive the tensioning wheel 68 to swing upwards, so that the abrasive belt is tensioned, in the process, due to the matching of the ratchet 66 and the arc-shaped ratchet rack 64, the adjusting rod 65 cannot retreat under the reaction force, and when the abrasive belt needs to be loosened, the ratchet 66 is separated from the arc-shaped ratchet rack 64 through the operating handle 67.

The belt sander provided by the embodiment can be suitable for sanding of different types of workpieces because the positions of the main body plate 16 and the sanding component 20 can be adjusted; because the motor mounting frame 30 can rotate, the correction function of the abrasive belt can be realized under the condition that an independent correction mechanism is not arranged; the grinding machine adopting the grinding assembly 20 provided by the embodiment has multiple grinding functions, specifically, the first grinding wheel 22 can be used for roughly grinding a workpiece, and as the first grinding wheel 22 is a rubber wheel, rolling friction exists between the first grinding wheel 22 and an abrasive belt, and the rubber has a damping effect, has a good grinding effect and has higher grinding efficiency; the second grinding wheel 24 can be used for grinding concave workpieces with relatively small angles, and the second grinding wheel 24 can be replaced, so that the grinding device can be suitable for grinding different workpieces; a workpiece with a relatively high flatness requirement may be ground using the flat grinding plate 58 between the two grinding wheels, and after the flat grinding plate 58 is removed, the cambered surface of the workpiece may also be ground using the abrasive belt segment between the two grinding wheels.

The present invention is described in detail with reference to the attached drawings, but the embodiments of the present invention are not limited to the above embodiments, and those skilled in the art can make various modifications to the present invention based on the prior art, which fall within the scope of the present invention.

Claims

1. The abrasive belt grinding machine is characterized by comprising a machine frame, a grinding assembly arranged on the machine frame, a motor mounting frame connected to the machine frame in a rotating mode and a motor arranged on the motor mounting frame, wherein the motor mounting frame and the rotating shaft of the machine frame are perpendicularly arranged with the output of the motor, the grinding assembly is directly or indirectly connected to a grinding wheel arranged on the machine frame in a rotating mode, a driving wheel arranged corresponding to the grinding wheel is arranged on the output shaft of the motor, and an abrasive belt is wound on the driving wheel and the grinding wheel.

2. The belt sander of claim 1, wherein a swing handle for driving the motor mount to swing is fixedly attached or integrally attached to the motor mount.

3. The abrasive belt sander as set forth in claim 1, wherein the frame comprises a bottom plate, and a first vertical plate, a second vertical plate and a third vertical plate which are respectively jogged on the bottom plate and are respectively arranged perpendicular to the bottom plate, the first vertical plate and the second vertical plate are arranged parallel to each other, the third vertical plate is located between the first vertical plate and the second vertical plate, one end of the third vertical plate is jogged on the first vertical plate, the other end is jogged on the second vertical plate, the upper end of the first vertical plate is rotatably connected with a turnover plate arranged parallel to the first vertical plate, a locking structure for relatively fixedly connecting the turnover plate and the first vertical plate is arranged between the turnover plate and the first vertical plate, the turnover plate is jogged with a main body plate arranged perpendicular to the turnover plate, the main body plate is jogged with a follower plate rotatably connected to the second vertical plate and two rail plates arranged parallel to each other, two be formed with the spout between the track board, sliding connection has the slide bar on the spout, the subassembly of polishing is installed the one end of slide bar, motor mounting bracket rotates to be connected on the main part board.

4. The belt sander of claim 3, wherein the locking structure comprises a third arcuate through slot formed in the flipping plate, a locking threaded hole formed in the first vertical plate, and a first locking bolt inserted into the third arcuate through slot and screwed into the locking threaded hole, wherein an axis of rotation between the flipping plate and the first vertical plate is arranged coaxially with a central axis of the third arcuate through slot, and a nut of the first locking bolt abuts against a side of the flipping plate away from the first vertical plate.

5. The belt sander as set forth in claim 3, wherein the turning plate is a sector plate, and the rotation axis between the turning plate and the first vertical plate is coaxial with the central axis of the arc-shaped surface of the turning plate, the locking structure comprises at least one clamping groove formed on the arc-shaped surface of the turning plate, a locking rod is rotatably connected to the first vertical plate, a clamping block matched with the clamping groove is arranged at one end of the locking rod, and a second locking bolt abutting against the first vertical plate is spirally connected to the rod body of the locking rod.

6. The abrasive belt sander of claim 3, wherein a slip-resistant plate is joggled between the two track plates, and a slip-resistant bolt abutting against the sliding rod is spirally connected to the slip-resistant plate.

7. The abrasive belt sander of claim 3, wherein the main body plate is fixedly connected or integrally connected with an arc ratchet bar arranged in parallel with the main body plate, the main body plate is rotatably connected with an adjusting rod, a rotating shaft between the adjusting rod and the main body plate is coaxially arranged with a central axis of the arc ratchet bar, the adjusting rod is rotatably connected with a ratchet matched with the arc ratchet bar, the ratchet is fixedly connected or integrally connected with an operating handle, the adjusting rod is further fixedly connected with a supporting rod, and the supporting rod is rotatably connected with a tension wheel abutting against the abrasive belt.

8. The belt sander according to any one of claims 1 to 7, wherein said sanding assembly comprises a support plate mounted on said machine frame, a first grinding wheel rotatably connected to one end of said support plate, and a grinding wheel holder rotatably connected to the other end of said support plate, one end of said grinding wheel holder being provided with a fastening threaded hole, the other end being detachably and rotatably connected to a second grinding wheel, the outer diameter of said second grinding wheel being smaller than or equal to the outer diameter of said first grinding wheel, and the central axis of said first grinding wheel and the central axis of said second grinding wheel being arranged in parallel, said support plate being provided with a first arcuate through-groove at a position corresponding to said fastening threaded hole, the rotational axis between said grinding wheel holder and said support plate being arranged coaxially with the central axis of said first arcuate through-groove, said first arcuate through-groove being pierced with a locking bolt screwed to said fastening threaded hole, the nut of the locking bolt abuts against one side, far away from the grinding wheel support, of the supporting plate.

9. The belt sander of claim 8, wherein the first grinding wheel is a rubber wheel.

10. The belt sander of claim 8, wherein the sanding assembly further comprises a flat sanding plate to which is fixedly attached a support arm removably fixedly attached to the support plate, and wherein the flat sanding plate is positioned between the first grinding wheel and the second grinding wheel, and wherein the flat sanding plate, the first grinding wheel, and the second grinding wheel are all positioned on the same side of the reference surface, and wherein the first grinding wheel and the second grinding wheel are all tangent to the reference surface, with the side of the flat sanding plate away from the support arm being the reference surface.