Multi-angle grinding device

Abstract

The present invention discloses a multi-angle grinding device, comprising a base and a stand on the base, the stand can move along the Y-axis direction on the base, a movable plate is provided on the stand, the movable plate can move along the Z-axis direction on the stand, a first power source, a rotating platform driven by the first power source, and a grinding structure driven to rotate by the rotating platform are provided on the movable plate, the grinding structure comprises a mounting plate, an abrasive belt located on the mounting plate, and a plurality of rollers located on the back side of the abrasive belt, the plurality of rollers are rotatably mounted on the mounting plate, a first protrusion is provided on the surface of the roller along the circumference of the roller, the roller can be pressed against the back side of the abrasive belt, so that the abrasive belt is partially concave from the back side to the front side, thereby forming a ridge-shaped protrusion on the front side of the abrasive belt that can grind the workpiece. Therefore, the present invention has the advantages of being able to grind the workpiece from multiple angles, grinding the curved surface and corners of the special-shaped curved surface, being more efficient, and having a better grinding effect.

Description

Technical Field

[0001] The invention relates to the field of grinding mechanisms, in particular to a multi-angle grinding device. Background Art

[0002] Due to the irregularity of the surface of special-shaped curved parts, the surface that needs to be ground is the curved surface or the corner. The curved surface has an arc and the space at the corner is narrow. The grinding parts of the commonly used multi-angle grinding devices are all arranged horizontally, so they can only grind the flat surface and it is difficult to grind special-shaped curved parts.

[0003] Chinese patent document CN 107553276A discloses a multi-angle grinding device for a special-shaped curved surface, comprising a machine platform, a suction mechanism, a grinding mechanism and a transmission mechanism, wherein the transmission mechanism comprises a motor, a driving wheel and a tensioning unit, wherein the motor is fixedly mounted on the machine platform, the driving wheel is fixedly connected to the power output end of the motor, the tensioning unit comprises an adjustable length adjustment rod and a tensioning wheel, the adjustment rod is horizontally mounted on the machine platform, one end of the adjustment rod is fixedly connected to the machine platform, and the other end of the adjustment rod is rotatably connected to the tensioning wheel; the grinding mechanism comprises an abrasive belt, a support rod and a contact grinding wheel, the support rod and the contact grinding wheel are fixedly connected to the machine platform, and the contact grinding wheel is ... The support rod is horizontally installed on the machine platform, and one end of the support rod is fixedly connected to the machine platform, and the other end of the support rod is detachably connected to the contact grinding wheel, and the driving wheel, the tensioning wheel and the contact grinding wheel are all vertically arranged on the same horizontal plane; the sanding belt is in contact with the driving wheel, the driving wheel and the side walls of the contact grinding wheel; the suction mechanism includes a negative pressure suction machine, a first suction pipe and a second suction pipe, the first suction pipe and the second suction pipe are both connected to the negative pressure suction machine, the end of the first suction pipe away from the negative pressure suction machine is opposite to the driving wheel, and the end of the second suction pipe away from the negative pressure suction machine is opposite to the contact grinding wheel.

[0004] The multi-angle grinding device for special-shaped curved surfaces in the above-mentioned prior art can, to a certain extent, perform grinding processing on certain large-area curved surfaces. However, there are still defects in actual use. For example, the above-mentioned prior art cannot smoothly process the edges and corners of special-shaped curved surface parts, and its use has limitations. Usually, the edges and corners have to be converted into manual grinding. Not only are the grinding effects uneven and there are large differences, but the workload is large and the efficiency is low, which makes it difficult to meet mass production. In addition, it cannot grind multiple workpieces at multiple angles, making it difficult to meet various grinding needs. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-angle grinding device which can grind workpieces from multiple angles and grind curved surfaces and corners of special-shaped curved surfaces with higher efficiency and better grinding effect.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a multi-angle grinding device is provided, comprising a base and a stand located on the base, the stand can move along the Y-axis direction on the base, a movable plate is provided on the stand, the movable plate can move along the Z-axis direction on the stand, a first power source, a rotating platform driven by the first power source, and a grinding structure driven to rotate by the rotating platform are provided on the movable plate, the grinding structure comprises a mounting plate, a sanding belt located on the mounting plate, and a plurality of rollers located on the back side of the sanding belt, the plurality of rollers are rotatably mounted on the mounting plate, a first protrusion is provided on the surface of the roller along the circumference of the roller, the roller can be against the back side of the sanding belt, so that the sanding belt is partially recessed from the back side to the front side, thereby forming a ridge-shaped protrusion on the front side of the sanding belt that can grind the workpiece.

[0007] As an improvement of the present invention, the surface of the roller transitions in a curved surface in the middle position along the axial direction toward the two ends of the roller.

[0008] As an improvement of the present invention, it also includes a roller drive assembly installed on the mounting plate, the roller drive assembly includes a bracket and a second power source, a plurality of rollers are installed on the bracket, the second power source is connected to the bracket and can drive the bracket to move, so that the rollers are against or away from the sanding belt.

[0009] As an improvement of the present invention, the bracket includes a seat body and a plurality of roller mounting seats, the rollers are installed in a one-to-one correspondence with the roller mounting seats, the roller mounting seats are installed on the seat body, and the roller mounting seats can slide relative to the seat body.

[0010] As an improvement of the present invention, a third guide rail or a third slider is provided on the seat body, and each of the roller mounting seats is provided with a third slider or a third guide rail that cooperates with the third guide rail or the third slider. The sliding of the roller mounting seat on the seat body is achieved through the cooperation between the third guide rail and the third slider.

[0011] As an improvement of the present invention, it also includes a sanding belt tensioning assembly, which includes a driving wheel and a driven wheel, the driving wheel and the driven wheel are mounted on the mounting plate, and the sanding belt is sleeved on the driving wheel and the driven wheel and tensioned by the driving wheel and the driven wheel.

[0012] As an improvement of the present invention, it further comprises a third power source installed on the installation plate, wherein the third power source is connected to the driving wheel and drives the driving wheel to rotate.

[0013] As an improvement of the present invention, it also includes an automatic tensioning component, which includes a pull rod, a compression elastic member, a limit member, and a guide groove opened on the mounting plate. The driven wheel mounting shaft can move up and down in the guide groove. One end of the pull rod is connected to the driven wheel mounting shaft along the guide groove upward, and the other end is connected to the driven wheel mounting shaft along the guide groove downward in sequence through the limit member and the compression elastic member. The limit member is against the bottom of the guide groove. When the compression elastic member is opened, the pull rod can pull the driven wheel mounting shaft to move downward.

[0014] As an improvement of the present invention, the movable plate is moved along the Z-axis direction on the stand by a first movable device, the first movable device includes a first slider and a first guide rail matching the slider, the first guide rail is installed on the stand, the first slider is installed on the movable plate and can slide on the first guide rail.

[0015] The present invention comprises a base and a stand located on the base, wherein the stand can move along the Y-axis direction on the base, a movable plate is provided on the stand, and the movable plate can move along the Z-axis direction on the stand, a first power source, a rotating platform driven by the first power source, and a grinding structure driven to rotate by the rotating platform are provided on the movable plate, the grinding structure comprises a mounting plate, a sanding belt located on the mounting plate, and a plurality of rollers located on the back side of the sanding belt, the plurality of rollers are rotatably mounted on the mounting plate, a first protrusion is provided on the surface of the roller along the circumference of the roller, the roller can abut against the back side of the sanding belt, causing the sanding belt to partially sink from the back side to the front side, thereby forming a ridge-shaped protrusion on the front side of the sanding belt that can grind the workpiece. In the present invention, mainly the first protrusion of the roller is against the back side of the sanding belt, and as the roller moves against the sanding belt, the sanding belt is partially recessed from the back side to the front side, thereby forming a ridge-shaped protrusion on the front side that can grind the workpiece. Therefore, the ridge-shaped protrusion formed by the sanding belt in the present invention can be used not only for grinding curved surfaces, but also for grinding corners. In addition, the multi-angle grinding device can be adjusted in the Y-axis and Z-axis directions in the present invention, and the sanding belt can also rotate. Therefore, the present invention can grind the workpiece from multiple different angles to meet different grinding needs. The present invention has a wider range of applications, higher efficiency and better grinding effect. Therefore, the present invention has the advantages of being able to grind curved surfaces and corners of special-shaped curved surfaces, higher efficiency and better grinding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic plan view of a first embodiment of the present invention;

[0017] Figure 2 for Figure 1 A schematic diagram of the structure in which the roller abuts against the abrasive belt;

[0018] Figure 3 for Figure 1A schematic diagram of the structure when the roller in FIG. 1 abuts against the abrasive belt;

[0019] Figure 4 for Figure 2 A top view of

[0020] Figure 5 for Figure 4 The enlarged structural diagram at A in the middle;

[0021] Figure 6 for Figure 3 A top view of

[0022] Figure 7 for Figure 1 Schematic diagram of some structures in ;

[0023] Figure 8 for Figure 7 A front view of

[0024] Fig. 9 It is a schematic diagram of the structure when the roller abuts against the abrasive belt;

[0025] Fig.10 for Figure 1 Schematic diagram of the three-dimensional structure after the partial structure in is disassembled;

[0026] Fig.11 for Figure 1 Schematic diagram of the three-dimensional structure after partial structure disassembly;

[0027] Fig.12 It is a plan view schematically showing a second embodiment of the present invention;

[0028] Fig.13 for Fig.12 Schematic diagram of some structures in ;

[0029] Fig.14 for Fig.13 Side view of

[0030] Fig.15 for Fig.13 Front view of . DETAILED DESCRIPTION

[0031] Below, the present invention is further described in conjunction with the accompanying drawings and specific embodiments:

[0032] Please see first Figures 1 to 11 , Figures 1 to 11Disclosed is a first embodiment of a multi-angle grinding device, a multi-angle grinding device, comprising a base 1 and a stand 2 located on the base 1, the stand 2 being movable on the base 1 along the Y-axis direction, a movable plate 3 being arranged on the stand 2, the movable plate 3 being movable on the stand 2 along the Z-axis direction, a first power source 40, a rotating platform 41 driven by the first power source 40, and a grinding structure driven to rotate by the rotating platform 41 being arranged on the movable plate 3, the grinding structure comprising a mounting plate 51, a sanding belt 52 located on the mounting plate 51, and a plurality of rollers 53 located on the back side of the sanding belt 52, in the present invention, specifically, the grinding surface of the sanding belt 52 is defined as the front side of the sanding belt, and the back side of the grinding surface is the back side of the sanding belt; a first protrusion 54 is arranged on the surface of the roller 53 along the circumference of the roller 53, in this embodiment, specifically, as Figure 4 and Figure 5 As shown, the first protrusion 54 is arranged at the middle position 56 of the surface of the roller 53. Of course, it can also be arranged at other positions on the surface, and the present invention is not limited thereto. The roller 53 can be pressed against the back side 521 of the abrasive belt 52, so that the abrasive belt 52 is partially recessed from the back side 521 to the front side 522, thereby forming a ridge-shaped protrusion 55 on the front side 522 of the abrasive belt 52 for grinding a workpiece. A rotating platform mounting position 510 is provided on the back of the mounting plate 51, and the rotating platform 41 is mounted on the rotating platform mounting position 510 on the back of the mounting plate 51. The first power source 40 is mounted on the side of the rotating platform 41, and the rotating platform 41 is driven by the first power source 40 to move, thereby driving the grinding structure to rotate, so that the rotation of the entire grinding structure can be realized, and the sand belt 52 of the grinding structure naturally rotates together, thereby realizing multi-angle grinding of the workpiece; in the present invention, the stand 2 can move along the Y-axis direction on the base 1, and the movable plate 3 can move along the Z-axis direction on the stand 2. For different workpieces, the positions and angles required for grinding are different. The present invention can realize the change of the direction of the entire grinding structure through the action of the rotating component rotating, the stand 2 can move along the Y-axis direction on the base 1, and the movable plate 3 moves along the Z-axis direction on the stand 2. Through the three direction adjustment devices, the sand belt 52 of the grinding structure can also change direction and angle accordingly, thereby realizing grinding of the workpiece from various angles, with better grinding effect and more thorough grinding.

[0033] In this embodiment, a roller drive assembly is also included which is mounted on the mounting plate 51. The roller drive assembly includes a bracket 61 and a second power source 62. A plurality of rollers 53 are mounted on the bracket 61. In this embodiment, there are three rollers 53. Of course, the number of rollers 53 can be installed according to grinding requirements, and the present invention does not limit this. The second power source 62 is connected to the bracket 61 and can drive the bracket 61 to move, so that the roller 53 moves against or away from the sanding belt 52. When the roller 53 is needed, the second power source 62 is driven to drive the roller 53 to move and against the sanding belt 52 (such as Fig. 9 When the roller 53 is not needed, the second power source 62 is driven to make the bracket 61 drive the roller 53 to move in the reverse direction and away from the abrasive belt 52 (as shown in FIG. Figure 8 In this embodiment, the roller 53 is automatically controlled to move closer to or away from the abrasive belt, which makes the operation more convenient. In this embodiment, the second power source 62 is a cylinder.

[0034] In this embodiment, the abrasive belt tensioning assembly includes a driving wheel 81 and a driven wheel 82, the driving wheel 81 and the driven wheel 82 are mounted on the mounting plate 51, and the abrasive belt 52 is sleeved on the driving wheel 81 and the driven wheel 82 and tensioned by the driving wheel 81 and the driven wheel 82. In order to enable the abrasive belt 52 to rotate and realize automatic grinding of the workpiece, a third power source 83 is installed on the mounting plate 51, the third power source 83 is connected to the driving wheel 81 and drives the driving wheel to rotate, thereby driving the driven wheel 82 to move, so that the abrasive belt 52 can be tensioned and moved between the driving wheel 81 and the driven wheel 82, the roller 53 can rotate in the bracket 61, when the roller 53 abuts against the abrasive belt 52, the abrasive belt 52 moves, and the roller 53 in contact with it also rolls accordingly.

[0035] In this embodiment, further, the surface of the roller 53 transitions to the two ends 57 of the roller in the axial direction at the middle position 56 in a curved surface. The purpose of such a setting is that the design can make the highest point of the ridge-shaped protrusion 55 a curved surface, which is conducive to grinding corners with relatively narrow space, and is not easy to damage the sand belt 52. During grinding, the sand belt 52 is tensioned, the roller 53 approaches the sand belt 52 and the roller 53 is against the back side 521 of the sand belt 52, so that the sand belt 52 is partially concave from the back side 521 to the front side 522, thereby forming a ridge-shaped protrusion 55 (such as a ridge-shaped protrusion 55) on the front side 522 that can grind the workpiece. Figure 6As shown in the figure, in the present invention, since a first protrusion 54 is provided on the surface of the roller 53 along the circumference of the roller 53, due to the special structure of the roller 53, when the roller 53 abuts against the back side 521 of the abrasive belt 52, it is mainly the first protrusion 54 of the roller 53 that abuts against the back side 521 of the abrasive belt 52, and a part of the abrasive belt 52 is recessed from the back side 521 to the front side 522, so that a ridge-shaped protrusion 55 for grinding a workpiece is formed on the front side 522, and the ridge-shaped protrusion 55 is in the shape of an elongated strip. Therefore, the formed ridge-shaped protrusion 55 can not only be used for grinding special-shaped curved surfaces, but also can be used for grinding parts with relatively narrow space such as corners, and is more flexible to use. Therefore, the abrasive belt in the present invention can be used not only for grinding curved surfaces, but also for grinding corners with relatively narrow space. Compared with the prior art, the scope of application of the present invention is wider.

[0036] In this embodiment, an automatic tensioning assembly is also included, and the automatic tensioning assembly includes a pull rod 72, a compression elastic member 73, a limit member 74, and a guide groove 71 opened on the mounting plate 51. In this embodiment, the compression elastic member 73 is a spring, and is a spring in a compressed state. The guide groove 71 is in an inverted U shape, and the guide groove 71 passes through the edge of the mounting plate 51, and the notch of the guide groove 71 is located at the bottom edge of the mounting plate 51. The driven wheel mounting shaft 84 can move up and down in the guide groove 71. The pull rod 72 moves upward along the guide groove 71 and is connected to the driven wheel mounting shaft 84, and the other end of the pull rod 72 passes through the limiter 74 and the compression elastic member 73 in sequence downward along the guide groove 71. The limiter 74 abuts against the notch of the guide groove 71. The spring in the compressed state always has an external tension. Therefore, the spring always drives the pull rod 72 to pull the driven wheel mounting shaft 84 downward. The driven wheel 82 has a tendency to move downward under the action of the driven wheel mounting shaft 84, so that the abrasive belt 52 is always in a tensioned state. In the present invention, the automatic tensioning assembly is set up for the purpose that, in the prior art, after being used for a period of time, the abrasive belt 52 is easily deformed and loosened, so that it cannot be tensioned between the driving wheel 81 and the driven wheel 82. In the present invention, under the action of the automatic tensioning assembly, the abrasive belt 52 can always be in a tensioned state, so as not to affect the grinding effect.

[0037] In this embodiment, the movable plate 3 is moved along the Z-axis direction on the stand 2 by a first movable device, the first movable device includes a first slider, and a first guide rail 21 matching the first slider, the first guide rail 21 is installed on the stand 2, the first slider is arranged on the movable plate 3 and can slide on the first guide rail 21, in this embodiment, specifically, the movable plate 3 is driven by a first driving device, the first driving device includes a screw rod 91, a nut 92, a connecting block 90, a driven wheel 93 at the screw rod end, a driving wheel 94 at the fourth power source end, a belt 95 and a fourth power source 96, the screw rod 91, the driven wheel 93 at the screw rod end, the driving wheel 94 at the fourth power source end and the fourth power source 96 are installed on the stand 2, specifically, the screw rod The driven wheel 93 at the end is arranged at one end of the screw rod 91, the driving wheel 94 at the fourth power source end is arranged at the output end of the fourth power source 96, the belt 95 is sleeved on the driven wheel 93 at the screw rod end and the driving wheel 94 at the fourth power source end, and is tensioned by the driven wheel 93 at the screw rod end and the driving wheel 94 at the fourth power source end, the screw rod 91 passes through the nut 92, and the nut 92 is arranged in the connecting block 90, and the connecting block 90 is fixed on the moving plate 3, and the driving wheel 94 at the fourth power source end is driven to rotate by the fourth power source 96, and under the action of the belt 95, the driven wheel 93 at the screw rod end also rotates, thereby driving the screw rod 91 to rotate, and the nut 92 and the connecting block 90 move relative to the screw rod 91, so as to drive the moving plate 3 to move up and down along the first guide rail 21. In this embodiment, the purpose of driving the moving plate 3 to move up and down along the first guide rail 21 is: when cutting, the grinding of the handle of the tool is adjusted in the vertical direction, so as to control the degree of cutting of the handle and the effect of cutting.

[0038] In this embodiment, the movement of the stand 2 along the Y-axis direction on the base 1 is achieved by a second moving device, and the second moving device includes a second slider 11 and a second guide rail 12 matching the second slider 11, the second guide rail 12 is installed on the base 1, the second slider 11 is set at the bottom of the stand 2, and the second slider 11 can slide on the second guide rail 12. In this embodiment, specifically, the stand 2 is driven by a second driving device. In this embodiment, the second driving device has the same structure as the first driving device, and they are not repeated here.

[0039] The present invention can also be set as a second embodiment (such as Figures 12 to 15 The second embodiment is substantially the same as the first embodiment, except that the bracket 61 includes a seat body 611 and a plurality of roller mounting seats 612, and the surface of the roller 53 has different sizes of transition from the middle position 56 to the two ends 57 of the roller along the axial direction, thereby forming rollers 53 with different sizes of first protrusions 54, such as Fig.13As shown, the range of transition from the middle position 56 of the five rollers 53 to the curved surfaces at both ends 57 of the rollers along the axial direction is different, so there are five rollers 53 with different sizes of first protrusions 54. The rollers 53 with different sizes of first protrusions 54 are respectively against the abrasive belt 52, and the protrusion amplitudes of the ridge-shaped protrusions 55 formed on the front side 522 of the abrasive belt 52 are also different, so different grinding requirements can be met, so that different grinding effects are formed on the workpiece. The rollers 53 are installed in a one-to-one correspondence with the roller mounting seat 612, and the roller mounting seat 612 is installed on the seat body 611, and the roller mounting seat 612 can slide relative to the seat body 611. Specifically, the seat body 611 is provided with a third guide rail or a third slider 64, and each of the roller mounting seats 612 is provided with a third slider or a third guide rail that cooperates with the third guide rail or the third slider 64. In this embodiment, specifically, the seat body 611 is provided with a third slider 64, and each of the roller mounting seats 612 is provided with a third guide rail (not visible in the figure) that cooperates with the third slider 64. The third guide rail and the third slider cooperate to achieve the sliding of the roller mounting seat 612 on the seat body 611. When the present invention is used, according to the grinding requirements, the corresponding roller 53 is selected, the latch 63 is pulled out, and the roller mounting seat 612 where the selected roller 53 is located is moved to move the roller 53 to the back side of the sanding belt 52, and the roller mounting seat 612 is fixed to the seat body 611 by the latch 63, and then the relevant grinding work is performed. In this embodiment, a variety of rollers 53 that can produce different grinding effects are provided at the same time, which can be flexibly selected by the operator, have a wider range of applications, and are easy to operate. Different rollers 53 with different sizes of the range of surface transition can be switched by simply moving them, without the need for frequent disassembly and installation to change wheels, which greatly improves work efficiency.

[0040] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims

1. A multi-angle grinding device, characterized in that: The invention comprises a base (1) and a stand (2) located on the base (1), wherein the stand (2) can move on the base (1) along the Y-axis direction, a movable plate (3) is provided on the stand (2), and the movable plate (3) can move on the stand (2) along the Z-axis direction, a first power source (40) and a rotating platform (41) driven by the first power source (40) are provided on the movable plate (3), and a grinding structure driven to rotate by the rotating platform (41), wherein the grinding structure comprises a mounting plate (51), a sanding belt (52) located on the mounting plate (51), and a sanding belt (52) located on the back side of the sanding belt (52). The plurality of rollers (53) are rotatably mounted on the mounting plate (51), and a first protrusion (54) is provided on the surface of the roller (53) along the circumference of the roller (53). The roller (53) can abut against the back side (521) of the abrasive belt (52), so that the abrasive belt (52) is partially recessed from the back side (521) to the front side (522), thereby forming a ridge-shaped protrusion (55) on the front side (522) of the abrasive belt (52) for grinding a workpiece. The surface of the roller (53) is curved at a middle position (56) along the axial direction toward two ends (57) of the roller. The rotating platform (41) is mounted on a rotating platform mounting position (510) on the back side of the mounting plate (51), and further comprises a roller drive assembly mounted on the mounting plate (51), the roller drive assembly comprising a bracket (61) and a second power source (62), a plurality of rollers (53) being mounted on the bracket (61), the second power source (62) being connected to the bracket (61) and being capable of driving the bracket (61) to move, thereby causing the rollers (53) to abut against or move away from the sanding belt (52), the bracket (61) comprising a seat body (611) and a plurality of roller mounting seats ( 612), the roller (53) and the roller mounting seat (612) are mounted in a one-to-one correspondence, the roller mounting seat (612) is mounted on the seat body (611), and the roller mounting seat (612) can slide relative to the seat body (611), the seat body (611) is provided with a third guide rail or a third slider (64), and each of the roller mounting seats (612) is provided with a third slider or a third guide rail that cooperates with the third guide rail or the third slider (64), and the sliding of the roller mounting seat (612) on the seat body (611) is achieved through the cooperation between the third guide rail and the third slider.

2. The multi-angle grinding device according to claim 1, characterized in that: It also comprises a sanding belt tensioning assembly, the sanding belt tensioning assembly comprising a driving wheel (81) and a driven wheel (82), the driving wheel (81) and the driven wheel (82) being mounted on the mounting plate (51), the sanding belt (52) being sleeved on the driving wheel (81) and the driven wheel (82) and being tensioned by the driving wheel (81) and the driven wheel (82).

3. The multi-angle grinding device according to claim 2, characterized in that: It also includes a third power source (83) mounted on the mounting plate (51), wherein the third power source (83) is connected to the driving wheel (81) and drives the driving wheel (81) to rotate.

4. The multi-angle grinding device according to claim 2, characterized in that: The invention also includes an automatic tensioning assembly, which includes a pull rod (72), a compression elastic member (73), a limit member (74), and a guide groove (71) provided on the mounting plate (51). The driven wheel mounting shaft (84) can move up and down in the guide groove (71). One end of the pull rod (72) is connected to the driven wheel mounting shaft (84) upward along the guide groove (71), and the other end is connected to the driven wheel mounting shaft (84) downward along the guide groove (71) and passes through the limit member (74) and the compression elastic member (73) in sequence. The limit member (74) is against the bottom of the guide groove (71). When the compression elastic member (73) is opened, the pull rod (72) can pull the driven wheel mounting shaft (84) to move downward.

5. The multi-angle grinding device according to claim 1 or 2, characterized in that: The movable plate (3) is moved along the Z-axis direction on the stand (2) by a first movable device, wherein the first movable device comprises a first slider and a first guide rail (21) matching the slider, wherein the first guide rail (21) is mounted on the stand (2), and the first slider is mounted on the movable plate (3) and can slide on the first guide rail (21).

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