Grinding mechanism

Abstract

The utility model belongs to the field of devices for grinding end faces, and particularly relates to a grinding mechanism. In order to solve the problems that in the process of grinding the end face of a workpiece to be machined through a grinding mechanism in the prior art, when the number of dust collection covers is small, the dust removal effect is poor; the utility model provides a grinding mechanism aiming at solving the technical problem that when the number of dust hoods is large, the structure is complex. The grinding mechanism comprises a grinding disc used for grinding the end face of the workpiece to be machined and a dust suction hood used for sucking away dust generated during machining, a dust suction pipe is connected to the dust suction hood or a connecting structure used for installing the dust suction pipe is arranged on the dust suction hood, the grinding disc is covered with the dust suction hood, and a receding hole allowing an output shaft of the grinding motor to penetrate through is formed in the dust suction hood. When the grinding mechanism is used for grinding a workpiece to be machined, the dust collection cover is arranged on the grinding disc in a covering mode, the dust collection cover sucks away dust generated during machining from the periphery of the grinding disc, the dust removal effect is good, only one dust collection cover is arranged on one grinding disc, and the structure is simple.

Description

Technical Field

[0001] The utility model belongs to the field of devices for grinding end faces, in particular to a grinding mechanism. Background Art

[0002] When processing the hollow pressure transmission block for artificial diamond, it is necessary to grind the six surfaces of the block of the hollow pressure transmission block to obtain a hollow pressure transmission block with smaller dimensional tolerance, smaller shape and position tolerance and higher end face quality. When grinding the end face of the hollow pressure transmission block, a grinding mechanism is required.

[0003] For example, a utility model patent with an authorization announcement date of 2022.05.27 and an authorization announcement number of CN216608311U discloses a rolling grinding mechanism for the end face of a supporting wheel side cover, the grinding mechanism comprising a frame on which is mounted a grinding blade (i.e., a grinding disc) for grinding the end face of a workpiece to be processed, a grinding motor for driving the grinding blade to rotate, and dust hoods located on both sides of the grinding blade. Each dust hood is connected to a vacuum cleaner (equivalent to a dust collection device) through a dust collection pipe. When the grinding blade grinds the workpiece to be processed, the dust hood is aligned with the workpiece to be processed and the grinding blade and is used to absorb the dust generated during processing.

[0004] When using the above-mentioned grinding mechanism to grind the end face of the workpiece to be processed (specifically, the end face of the workpiece waiting to be processed, such as the side cover of the supporting wheel or the hollow pressure transmission block), first, turn on the vacuum cleaner and the grinding motor; then, make the grinding blade contact with the workpiece to be processed, and the vacuum cleaner sucks away the dust generated during grinding through the dust suction pipe and the dust suction hood; finally, separate the grinding blade from the workpiece to be processed, and the processing is completed.

[0005] However, in the process of using the above-mentioned grinding mechanism to grind the end face of the workpiece to be processed, since the single dust hood is only located on the radial side of the grinding blade, the single dust hood can only suck away the dust on the radial side of the grinding blade, and the dust removal effect is poor; although the dust removal effect can be improved by setting up multiple dust hoods, the increase in dust hoods, dust pipes and vacuum cleaners will lead to a more complicated structure. Utility Model Content

[0006] The purpose of the utility model is to provide a grinding mechanism to solve the technical problems that in the process of grinding the end face of a workpiece to be processed by the grinding mechanism in the prior art, the dust hood is arranged on one side of the grinding disc, the dust removal effect is poor when the number of dust hoods is small; and the structure is complicated when the number of dust hoods is large.

[0007] The utility model also aims to provide a dust hood to solve the same technical problem as above.

[0008] In order to achieve the above-mentioned purpose, the technical solution of the grinding mechanism provided by the utility model is:

[0009] A grinding mechanism comprises a grinding disc for grinding the end face of a workpiece to be processed and a dust hood for sucking away dust generated during processing, the dust hood is connected to a dust suction pipe for connecting to a dust suction device or the dust hood is provided with a connecting structure for installing a dust suction pipe connected to the dust suction device, the dust hood is arranged on the grinding disc, and the dust hood is provided with an avoidance hole for the output shaft of a grinding motor to pass through; the side of the grinding disc used for grinding the workpiece to be processed is defined as the grinding surface, and in the axial direction of the grinding disc, the grinding surface of the grinding disc protrudes from the dust hood.

[0010] Furthermore, the dust hood includes an end plate and a side plate connected to the end plate and used to surround the outside of the grinding disc, at least a portion of the side plate forms a dust collecting portion, and the cross-section of the dust collecting portion is at least three quarters of a circle concentric with the grinding disc; the avoidance hole is arranged on the end plate, and in the axial direction of the grinding disc, the grinding surface of the grinding disc protrudes from the side plate.

[0011] Furthermore, a portion of the side panel is also surrounded by a narrowing portion; the dust suction pipe is connected to the narrowing portion, and the width of the narrowing portion gradually narrows in the direction from the dust collecting portion to the dust suction pipe; or, a connecting structure for connecting the dust suction pipe is arranged on the narrowing portion, and the width of the narrowing portion gradually narrows in the direction from the dust collecting portion to the connecting structure.

[0012] Furthermore, the side panels are perpendicular to the end panels.

[0013] Furthermore, a dustproof sleeve is detachably fixedly connected to the output shaft of the grinding motor, and the dustproof sleeve is located on a side of the grinding disc away from the grinding surface.

[0014] Furthermore, the output shaft of the grinding motor is provided with an external thread, the inner wall surface of the dustproof sleeve is provided with an internal thread corresponding to the external thread, and the dustproof sleeve is fixedly connected to the output shaft of the grinding motor through the external thread and the internal thread.

[0015] Furthermore, the grinding mechanism also includes a frame, the frame includes a motor seat, a connecting piece is fixedly connected to the dust hood, and one end of the connecting piece away from the dust hood is fixedly connected to the motor seat.

[0016] Furthermore, the dust suction pipe is a hose; the frame also includes a mounting frame, and the motor seat is movably connected to the mounting frame along the axial direction of the grinding disc.

[0017] Furthermore, the dust suction pipe is a hose; the frame also includes a mounting frame, and the motor seat is movably connected to the mounting frame along a direction parallel to the radial direction of the grinding disc.

[0018] Furthermore, the connecting member is a connecting rod, and the number of the connecting rods is at least two, all the connecting rods are evenly spaced on the same circumference, and the center of the circle surrounded by all the connecting rods is located on the axis of the grinding disc.

[0019] The beneficial effects of the grinding mechanism of the utility model are as follows: the utility model is an improved invention. The grinding disc can be used to grind the workpiece to be processed; the dust hood is set on the grinding disc, which can suck away dust from all around the grinding disc, and there is no need to set up multiple dust hoods around the grinding disc, which has a simple structure and good dust removal effect; the avoidance hole is set to avoid interference between the dust hood and the output shaft of the grinding motor; in the axial direction of the grinding disc, the grinding surface of the grinding disc is protruded from the dust hood, which can avoid contact between the dust hood and the workpiece to be processed, and ensure that the grinding disc can grind the end face of the workpiece to be processed; when the grinding mechanism in the technical solution is used to grind the end face of the workpiece to be processed, a dust suction pipe connected to the dust suction device is installed through the connection structure of the dust suction hood, or the dust suction device is directly connected through the dust suction pipe on the dust suction hood, so that the dust generated during processing can be directly sucked away from all around the grinding disc, and the dust removal effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A structural schematic diagram of an embodiment of the grinding mechanism of the utility model from one angle;

[0021] Figure 2 It is a structural schematic diagram of another angle of an embodiment of the grinding mechanism of the utility model;

[0022] Figure 3 It is a front view of an embodiment of the grinding mechanism of the utility model;

[0023] Figure 4 for Figure 1 A schematic diagram of the structure of the dust collection hood and the dust collection pipe at an angle;

[0024] Figure 5 for Figure 1 A schematic diagram of the structure of the dust hood and the dust pipe from another angle.

[0025] Description of reference numerals:

[0026] 1. Grinding motor; 101. Output shaft; 2. Dust hood; 21. Avoidance hole; 22. Narrowing part; 231. End plate; 232. Side plate; 3. Dust suction pipe; 4. Frame; 5. Transverse screw; 6. Transverse seat; 7. Transverse motor; 8. Adjustment motor; 9. Motor seat; 10. Connecting rod; 11. Grinding disc; 12. Adjustment screw; 13. Dustproof sleeve. DETAILED DESCRIPTION

[0027] In order to solve the problems mentioned in the background technology, the main inventive concept of the utility model is: the dust hood is set on the grinding disc, and avoidance holes are set to avoid interference between the dust hood and the output shaft of the grinding motor, so as to ensure that the grinding surface of the grinding disc used for grinding the workpiece to be processed protrudes from the dust hood, so that the dust hood can absorb the dust generated during processing from all sides of the grinding disc, and the dust removal effect is good; at the same time, only one dust hood needs to be set on a grinding disc, and there is no need to set multiple dust hoods around the grinding disc, and the structure is simple.

[0028] The present invention is further described in detail below in conjunction with the embodiments.

[0029] The specific embodiment of the grinding mechanism provided by the utility model is as follows:

[0030] like Figure 1-5 As shown, as a specific implementation, the grinding mechanism includes a frame 4, on which are mounted a grinding disc 11 for grinding the end face of a workpiece to be processed, a grinding motor 1 for driving the grinding disc 11 to rotate, and a dust hood 2 for sucking away dust generated during processing, the dust hood 2 is connected to a dust suction pipe 3 for connecting to a dust suction device, the dust hood 2 is arranged on the grinding disc 11, and the dust hood 2 is provided with an avoidance hole 21 for the output shaft 101 of the grinding motor 1 to pass through; the side of the grinding disc 11 used for grinding the workpiece to be processed is defined as the grinding surface, and in the axial direction of the grinding disc 11, the grinding surface of the grinding disc 11 protrudes from the dust hood 2.

[0031] Of course, in other specific embodiments, the dust hood 2 may also be provided with a connection structure for installing a dust suction pipe connected to the dust suction device. In this case, the dust suction pipe is not part of the grinding mechanism, and the dust suction pipe of the dust suction device can be directly installed on the connection structure. Specifically, the connection structure may be a connection flange; of course, the connection structure may also be a connecting tube and a clamp. After the dust suction pipe of the dust suction device is installed on the connecting tube, the clamp is used to clamp the dust suction pipe and the connecting tube, so that the dust suction pipe is fixedly connected to the connecting tube. In this embodiment, the connection method between the dust suction pipe and the dust suction hood 2 is not limited, as long as the dust suction pipe can be installed on the dust suction hood.

[0032] Specifically, as a specific implementation method, Figure 1-5 As shown, the axis of the grinding disc 11 extends in the vertical direction, and the grinding mechanism is a top grinding mechanism, that is, a mechanism for grinding the top surface of the workpiece to be processed; but in other specific embodiments, the axis of the grinding disc 11 can also be parallel to the horizontal plane, and the grinding mechanism is a side grinding mechanism, that is, a side grinding mechanism for grinding the side surface of the workpiece to be processed. In this embodiment, there is no restriction on the direction of the axis of the grinding disc 11, as long as the grinding disc 11 can grind the end surface of the workpiece to be processed.

[0033] As a specific implementation, the workpiece to be processed is a hollow pressure transmission block, but in other specific implementations, the workpiece to be processed can also be a workpiece whose other end faces need to be ground, such as the supporting wheel side cover mentioned in the background technology of the utility model. In this embodiment, there is no limitation on the workpiece to be processed.

[0034] The grinding disc 11 can grind the workpiece to be processed, the grinding motor 1 can drive the grinding disc 11 to rotate, and the dust generated during processing can be sucked away by the dust hood 2 and the dust suction pipe 3 connected to the dust suction device; the dust suction hood 2 is set on the grinding disc 11, and dust can be sucked away from all around the grinding disc 11, and there is no need to set multiple dust suction hoods 2 around the grinding disc 11, which has a simple structure and good dust removal effect; the avoidance hole 21 is set to avoid interference between the dust suction hood 2 and the output shaft 101 of the grinding motor 1; in the axial direction of the grinding disc 11, the grinding surface of the grinding disc 11 is protruded from the dust suction hood 2, which can avoid contact between the dust suction hood 2 and the workpiece to be processed, and ensure that the grinding disc 11 can grind the end face of the workpiece to be processed. When the grinding mechanism is used to grind the end face of the workpiece to be processed, the dust suction device is connected through the dust suction pipe 3 on the dust suction hood 2, so that the dust generated during processing is directly sucked away from all around the grinding disc 11, and the dust removal effect is good.

[0035] like Figure 1-5 As shown, in order to improve the dust removal effect, as a specific embodiment, the dust hood 2 includes an end plate 231 and a side plate 232 connected to the end plate 231 and used to surround the outside of the grinding disc 11. A portion of the side plate 232 surrounds a dust collecting portion, and the cross-section of the dust collecting portion is at least three quarters of a circle concentric with the grinding disc 11; the avoidance hole 21 is provided on the end plate 231, and in the axial direction of the grinding disc 11, the grinding surface of the grinding disc 11 protrudes from the side plate 232, thereby ensuring that the grinding surface can contact the workpiece to be processed. Specifically, as a specific embodiment, the cross-section of the dust collecting portion is three quarters of a circle, so that the cross-section of the dust collecting portion is three quarters of a circle concentric with the grinding disc 11, which can ensure that the gap between the inner wall surface of the dust collecting portion and the outer peripheral surface of the grinding disc 11 is equal everywhere, which is conducive to improving the dust removal effect.

[0036] However, in other specific embodiments, the cross section of the dust collecting portion may be a complete circle, in which case the side plate 232 is a circular ring plate, and the side plate 232 completely surrounds the dust collecting portion; or, the cross section of the dust collecting portion may be four fifths of a circle; or, the cross section of the dust collecting portion may be a rectangular or diamond-shaped structure. In this embodiment, the specific shape of the cross section of the dust collecting portion is not limited.

[0037] like Figure 4-5As shown, in order to further improve the dust removal effect, as a specific implementation, a part of the side plate 232 is also surrounded by a narrowing portion 22, and the dust suction pipe 3 is connected to the narrowing portion 22. The width of the narrowing portion 22 gradually narrows in the direction from the dust collecting portion to the dust suction pipe 3. Since the narrowing portion 22 gradually narrows in the direction from the dust collecting portion to the dust suction pipe 3, the wind speed will gradually increase, and the air pressure at the connection between the narrowing section and the dust suction pipe 3 is lower than the air pressure at the connection between the narrowing section and the dust collecting portion, which is conducive to further improving the dust removal effect.

[0038] In other specific implementations, when the grinding mechanism does not include a dust suction pipe, a connection structure for connecting the dust suction pipe is provided on the narrowing portion 22, and the width of the narrowing portion 22 gradually narrows in the direction from the dust collecting portion to the connection structure. Since the narrowing portion 22 gradually narrows in the direction from the dust collecting portion to the connection structure, the wind speed gradually increases, and the air pressure at the connection structure is lower than the air pressure at the connection between the narrowing section and the dust collecting portion, which is conducive to further improving the dust removal effect.

[0039] However, in other specific embodiments, the narrowing portion 22 may not be provided, and the side plate 232 may be a circular ring plate, and the dust suction pipe 3 may be connected to the side plate 232; of course, in other specific embodiments, the dust suction pipe 3 may also be connected to the end plate 231.

[0040] Specifically, a storage space for accommodating the grinding disc 11 is formed between the side panels 232, and a dust collecting space is formed between the dust collecting parts, which is a cylindrical space whose axis coincides with the axis of the avoidance hole; a narrowing space is formed between the narrowing parts 22, and the width of the narrowing space gradually narrows in the direction from the dust collecting space to the dust suction pipe; the dust collecting space and the narrowing space communicate with each other to form a storage space for accommodating the grinding disc 11.

[0041] Specifically, Figure 1-5 As shown, in order to simplify the structure, as a specific implementation, the side plate 232 is perpendicular to the end plate 231, and the structure is simple. However, in other specific implementations, the side plate 232 can also be at a certain angle with the end plate 231, and the side plate 232 encloses a truncated cone-shaped internal space; in this embodiment, there is no limitation on the angle between the side plate 232 and the end plate 231, as long as the side plate 232 and the end plate 231 can cover the grinding disc 11.

[0042] like Figure 1-5As shown, in order to further simplify the structure, as a specific implementation, the cross section of the avoidance hole 21 is a circle whose center is located on the axis of the grinding disc 11, and the avoidance hole 21 is a circular avoidance hole 21. At this time, the distance from the hole wall of the avoidance hole 21 to the outer wall of the output shaft 101 of the grinding motor 1 is a constant value, the structure is simple, and it can ensure that the hole wall of the avoidance hole 21 does not interfere with the output shaft 101 of the grinding motor 1. Of course, in other specific implementations, the cross section of the avoidance hole 21 can also be rectangular, and the avoidance hole 21 is a rectangular avoidance hole 21. On the premise of ensuring that the hole wall of the avoidance hole 21 does not interfere with the output shaft 101 of the grinding motor 1, the area of ​​the cross section of the rectangular avoidance hole 21 is greater than the area of ​​the cross section of the circular avoidance hole 21.

[0043] like Figure 3 As shown, in order to prevent dust from adhering to the output shaft 101 of the grinding motor 1 and prolong the service life of the grinding motor 1, as a specific implementation, a dustproof sleeve 13 is detachably fixedly connected to the output shaft 101 of the grinding motor 1, and the dustproof sleeve 13 is located on the side of the grinding disc 11 away from the grinding surface, thereby preventing dust from falling on the output shaft 101 of the grinding motor 1 and prolonging the service life of the grinding motor 1. Of course, in other specific implementations, the dustproof sleeve 13 may not be provided, but the grinding motor 1 may be regularly maintained to clean the dust adhering to the output shaft 101 of the grinding motor 1.

[0044] In order to conveniently fix the dustproof sleeve 13 on the output shaft 101 of the grinding motor 1, as a specific implementation method, the output shaft 101 of the grinding motor 1 is provided with an external thread, and the inner wall surface of the dustproof sleeve 13 is provided with an internal thread corresponding to the external thread. The dustproof sleeve 13 is fixedly connected to the output shaft 101 of the grinding motor 1 through the external thread and the internal thread. The structure is simple, and the dustproof sleeve 13 can be conveniently installed on the output shaft 101 of the grinding motor 1. At the same time, the dustproof sleeve 13 can be conveniently removed from the output shaft 101 of the grinding motor 1.

[0045] Of course, in other specific embodiments, the output shaft 101 of the grinding motor 1 is provided with an external thread. A nut is first installed on the output shaft 101 of the grinding motor 1, and then the dustproof sleeve 13 is fixed to the nut by clamping, welding, etc. In this embodiment, the installation method of the dustproof sleeve 13 is not limited, as long as the dustproof sleeve 13 can be detachably installed on the output shaft 101 of the grinding motor 1.

[0046] like Figure 2As shown, in order to conveniently fix the dust hood 2, as a specific embodiment, the frame 4 includes a motor seat 9, and a connecting piece is fixedly connected to the dust hood 2, and one end of the connecting piece away from the dust hood 2 is fixedly connected to the motor seat 9. Specifically, the connecting piece is a connecting rod 10, and the dust hood 2 can be conveniently fixed to the motor seat 9 through the connecting rod 10. Of course, in other specific embodiments, the connecting piece can also be a connecting plate or other structures; of course, a dust hood bracket can also be separately provided, and the dust hood 2 can be installed on the dust hood bracket, so as to achieve the fixation of the dust hood 2.

[0047] like Figure 2 As shown, in order to better fix the dust hood 2, as a specific embodiment, the connecting member is a connecting rod 10, and the number of the connecting rods 10 is two, all the connecting rods 10 are evenly spaced on the same circumference, and the center of the circle surrounded by all the connecting rods 10 is located on the axis of the grinding disc 11, so as to better fix the dust hood 2. However, in other specific embodiments, the number of connecting rods 10 can also be three, four or more; or, the connecting rods 10 may not be arranged on the same circumference; in this embodiment, the arrangement of the connecting rods 10 is not limited, as long as the connecting rods 10 can ensure that the dust hood 2 is fixed on the motor base 9.

[0048] like Figure 1-3 As shown, on the basis that the dust hood 2 is fixedly connected to the motor base 9, in order to conveniently adjust the grinding depth of the workpiece to be processed, as a specific implementation method, the dust suction pipe 3 is a hose; the frame 4 also includes a mounting frame, and the motor base 9 is movably connected to the mounting frame along the axial direction of the grinding disc 11, and the distance between the grinding disc 11 and the workpiece to be processed is adjusted by controlling the axial movement distance of the motor base 9 along the grinding disc 11, thereby adjusting the distance between the grinding disc 11 and the workpiece to be processed, and adjusting the grinding depth of the workpiece to be processed; the dust suction pipe 3 is a hose, so as to prevent the dust hood from being damaged when the dust removal hood moves with the motor base 9.

[0049] Of course, in other specific embodiments, the motor seat 9 can also be fixedly installed on the mounting frame. In this case, a clamp is used to clamp the workpiece to be processed, and the movement of the clamp along the axial direction of the grinding disc 11 is controlled to adjust the grinding depth of the workpiece to be processed. Since the motor seat 9 does not move, the dust suction pipe 3 can be a hard pipe.

[0050] like Figure 1-3 As shown, on the basis of the dust hood 2 being fixedly connected to the motor base 9, in order to enable the grinding disc 11 to conveniently grind the entire end surface of the workpiece to be processed, as a specific implementation method, the frame 4 also includes a mounting frame, and the motor base 9 is movably connected to the mounting frame along the radial direction of the grinding disc 11. The motor base 9 drives the grinding motor 1 and the grinding disc 11 to move, thereby grinding the entire end surface of the workpiece to be processed.

[0051] Of course, in other specific embodiments, the motor seat 9 can also be fixedly installed on the mounting frame. At this time, the workpiece to be processed is clamped by a clamp, and the clamp is controlled to move radially along the grinding disc 11, so that the grinding disc 11 grinds the entire end surface of the workpiece to be processed.

[0052] Specifically, the mounting frame is provided with a transverse screw 5 extending along the radial direction of the grinding disc 11, one end of the transverse screw 5 is connected to a transverse motor 7 for controlling the rotation of the transverse screw 5, and the transverse seat 6 is connected to the transverse screw 5. The transverse seat 6, the transverse screw 5 and the mounting frame constitute a nut screw mechanism. The transverse seat 6 is provided with an adjustment screw 12 extending along the axial direction of the grinding disc 11, one end of the adjustment screw 12 is connected to an adjustment motor 8 for controlling the rotation of the adjustment screw 12, the transverse seat 6, the adjustment screw 12 and the motor seat 9 constitute a nut screw mechanism, and the motor seat 9 is indirectly arranged on the mounting frame through the transverse seat 6. The motor seat 9 can be controlled to move along the axial direction of the grinding disc 11 by adjusting the motor 8, thereby adjusting the grinding depth of the workpiece to be processed; the transverse motor 7 can conveniently control the movement of the transverse seat 6 along the radial direction of the grinding disc 11, so that the grinding disc 11 grinds the entire end surface of the workpiece to be processed.

[0053] Of course, in other specific embodiments, the mounting frame may also be provided with a slide rail extending radially along the grinding disc 11, the transverse shift seat 6 may be provided with a corresponding slider, and the mounting frame may be provided with a cylinder whose output end is transmission-connected to the transverse shift seat 6, and the transverse shift seat 6 may be controlled by the cylinder to move radially along the grinding disc 11, so that the grinding disc 11 grinds the entire end surface of the workpiece to be processed.

[0054] Of course, in other specific embodiments, the transverse seat 6 may also be provided with a slide rail extending along the axial direction of the grinding disc 11, the motor seat 9 may be provided with a corresponding slider, and the transverse seat 6 may be provided with a cylinder whose output end is transmission-connected to the motor seat 9, and the cylinder controls the axial movement of the motor seat 9 along the grinding disc 11, thereby adjusting the grinding depth of the workpiece to be processed.

[0055] Of course, in different specific embodiments, the transverse screw 5 or the adjusting screw 12 may not be provided, so that the motor seat 9 can only move axially or radially along the grinding disc 11, and the workpiece to be processed is clamped by a clamp, and the grinding depth is adjusted by moving the clamp to ensure that the grinding disc 11 grinds the entire end surface of the workpiece to be processed.

[0056] Finally, it should be noted that the above are only preferred embodiments of the utility model and are not intended to limit the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A grinding mechanism, comprising a grinding disc for grinding the end face of a workpiece to be machined and a dust hood for sucking away dust generated during machining, the dust hood being connected to a dust suction pipe for connecting to a dust suction device or the dust hood being provided with a connecting structure for installing a dust suction pipe connected to a dust suction device, characterized in that: The dust hood is arranged on the grinding disc, and an avoidance hole is arranged on the dust hood for the output shaft of the grinding motor to pass through; the side of the grinding disc used for grinding the workpiece to be processed is defined as the grinding surface, and in the axial direction of the grinding disc, the grinding surface of the grinding disc protrudes from the dust hood.

2. The grinding mechanism according to claim 1, characterized in that: The dust hood includes an end plate and a side plate connected to the end plate and used to surround the outside of the grinding disc, at least a portion of the side plate forms a dust collecting portion, and the cross-section of the dust collecting portion is at least three quarters of a circle concentric with the grinding disc; the avoidance hole is arranged on the end plate, and in the axial direction of the grinding disc, the grinding surface of the grinding disc protrudes from the side plate.

3. The grinding mechanism according to claim 2, characterized in that: A portion of the side panel also forms a narrowing portion; the dust suction pipe is connected to the narrowing portion, and the width of the narrowing portion gradually narrows in the direction from the dust collecting portion to the dust suction pipe; or, a connecting structure for connecting the dust suction pipe is arranged on the narrowing portion, and the width of the narrowing portion gradually narrows in the direction from the dust collecting portion to the connecting structure.

4. The grinding mechanism according to claim 2 or 3, characterized in that: The side panels are perpendicular to the end panels.

5. The grinding mechanism according to any one of claims 1 to 3, characterized in that: A dustproof sleeve is detachably fixedly connected to the output shaft of the grinding motor, and the dustproof sleeve is located on the side of the grinding disc away from the grinding surface.

6. The grinding mechanism according to claim 5, characterized in that: The output shaft of the grinding motor is provided with an external thread, the inner wall surface of the dustproof sleeve is provided with an internal thread corresponding to the external thread, and the dustproof sleeve is fixedly connected to the output shaft of the grinding motor through the external thread and the internal thread.

7. The grinding mechanism according to any one of claims 1 to 3, characterized in that: The grinding mechanism also includes a frame, which includes a motor seat. A connecting piece is fixedly connected to the dust hood, and one end of the connecting piece away from the dust hood is fixedly connected to the motor seat.

8. The grinding mechanism according to claim 7, characterized in that: The dust suction pipe is a hose; the frame also includes a mounting frame, and the motor seat is movably connected to the mounting frame along the axial direction of the grinding disc.

9. The grinding mechanism according to claim 7, characterized in that: The dust suction pipe is a hose; the frame also includes a mounting frame, and the motor seat is movably connected to the mounting frame along a direction parallel to the radial direction of the grinding disc.

10. The grinding mechanism according to claim 7, characterized in that: The connecting piece is a connecting rod, and the number of the connecting rods is at least two, all the connecting rods are evenly distributed on the same circumference, and the center of the circle surrounded by all the connecting rods is located on the axis of the grinding disc.

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