An automatic grinding machine

Abstract

This invention discloses an automatic grinding machine for grinding parts to be ground. It includes a frame, a tail grinding device, two side grinding devices, and an internal grinding device. In use, the part to be ground is arranged inside the frame. The tail grinding device and the internal grinding device move linearly along the frame until the tail grinding device contacts the tail of the part to be ground, and the internal grinding device contacts the inner wall of the part to be ground. At this time, the two side grinding devices act on the outer wall of the part to be ground, achieving simultaneous grinding of the tail, inner wall, and outer wall of the part. This saves manpower and improves the grinding efficiency of the part to be ground. When the automatic grinding machine is applied to grinding ceramic filter cartridges, it can improve the grinding efficiency of the ceramic filter cartridges.

Description

Technical Field

[0001] This invention relates to the field of grinding equipment technology, and in particular to an automatic grinding machine. Background Technology

[0002] After the existing ceramic filter cartridges are produced, there are surface defects such as rough edges at the mold joints, protrusions at the tail pins, and uneven inner walls of the flanges. To improve the overall appearance of the product, manual sanding is required to remove the rough edges at the mold joints, protrusions at the tail pins, and inner walls of the flanges, which is inefficient.

[0003] Therefore, how to improve the grinding efficiency of ceramic filter cartridges is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an automatic grinding machine to improve the grinding efficiency of ceramic filter cartridges;

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An automatic grinding machine for grinding parts to be ground includes a frame, a tail grinding device, side grinding devices, and an internal grinding device, wherein:

[0007] The frame is slot-shaped;

[0008] The tail grinding device, the side grinding devices and the internal grinding device are arranged sequentially inside the frame and can move along a straight line on the frame;

[0009] The tail grinding device is used to grind the tail of the part to be ground;

[0010] The two-sided grinding devices are used to grind the outer wall of the part to be ground.

[0011] The internal grinding device is used to grind the inner wall of the part to be ground.

[0012] Optionally, in the above-mentioned automatic grinding machine, a slide rail is arranged on the first side of the frame, and the tail grinding device, the side grinding devices and the internal grinding device can slide along the slide rail.

[0013] Optionally, in the above-mentioned automatic grinding machine, a positioning block is arranged inside the frame, which is used to limit the workpiece to be ground.

[0014] Optionally, in the above-mentioned automatic grinding machine, the tail grinding device includes a first connecting block, a first cylinder, a first motor, and a contour grinding head, wherein:

[0015] The first cylinder is located on the second side of the frame;

[0016] The first end of the first connecting block is connected to the slide rail, and the second end of the first connecting block is connected to the first cylinder;

[0017] The first cylinder is used to drive the first connecting block to feed linearly along the slide rail;

[0018] The first motor is fixed to the first connecting block and connected to the contour grinding head, and is used to drive the contour grinding head to rotate.

[0019] Contouring grinding heads are used to grind the tail end of the workpiece to be repaired.

[0020] Optionally, in the above-mentioned automatic grinding machine, the two-sided grinding device includes a second connecting block, a second cylinder, and a side grinding head assembly, wherein:

[0021] The second cylinder is located on the second side of the frame;

[0022] The first end of the second connecting block is connected to the slide rail, and the second end of the second connecting block is connected to the second cylinder;

[0023] The second cylinder is used to drive the second connecting block to feed linearly along the slide rail;

[0024] The side grinding head assembly is fixed to the second connecting block.

[0025] Optionally, in the above-mentioned automatic grinding machine, there are two side grinding head assemblies, which are arranged opposite to each other;

[0026] The side grinding head assembly includes a suspension bar and an arc-shaped grinding head;

[0027] The first end of the suspension bar is connected to the second connecting block, and the second end is connected to the arc-shaped grinding head;

[0028] Arc-shaped grinding heads are used to grind the outer wall of the workpiece to be ground.

[0029] Optionally, in the above-mentioned automatic grinding machine, the arc-shaped grinding head is made of a flexible material;

[0030] Sandpaper is attached to the side of the arc-shaped grinding head closest to the workpiece to be ground.

[0031] Optionally, in the above-mentioned automatic grinding machine, the internal grinding device includes a third connecting block, a third cylinder, a second motor, and an internal grinding head, wherein:

[0032] The third cylinder is located on the second side of the frame;

[0033] The first end of the third connecting block is connected to the slide rail, and the second end of the third connecting block is connected to the third cylinder;

[0034] The third cylinder is used to drive the third connecting block to feed linearly along the slide rail;

[0035] The second motor is fixed to the third connecting block and connected to the inner grinding head to drive the inner grinding head to rotate.

[0036] Internal grinding heads are used to grind the inner walls of workpieces to be repaired.

[0037] Optionally, in the above-mentioned automatic grinding machine, the bottom of the frame is provided with multiple through holes;

[0038] The automatic grinding machine also includes a negative pressure fan. The pipes of the negative pressure fan are connected to the through holes, and the negative pressure fan is used to suck away the dust inside the frame.

[0039] Optionally, in the above-mentioned automatic grinding machine, the automatic grinding machine further includes a first dust collection plate, a second dust collection plate, and a dust cover, wherein:

[0040] The first dust collection plate and the second dust collection plate are respectively arranged on both sides of the positioning block;

[0041] The dust cover is trough-shaped and connected to the rack to cover the rack;

[0042] The dust cover can extend and retract horizontally along the frame.

[0043] The automatic grinding machine provided by this invention has the workpiece to be ground arranged inside the frame during use. The tail grinding device and the internal grinding device move in a straight line on the frame until the tail grinding device contacts the tail of the workpiece to be ground and the internal grinding device contacts the inner wall of the workpiece to be ground. At this time, the grinding devices on both sides act on the outer wall of the workpiece to be ground, so as to realize the simultaneous grinding of the tail, inner wall and outer wall of the workpiece to be ground, thereby saving manpower and improving the grinding efficiency of the workpiece to be ground. When the automatic grinding machine is applied to grinding ceramic filter cartridges, it can improve the grinding efficiency of ceramic filter cartridges. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is an overall structural diagram of the automatic grinding machine disclosed in an embodiment of the present invention;

[0046] Figure 2 This is an overall structural diagram of the tail grinding device disclosed in an embodiment of the present invention;

[0047] Figure 3 This is a front view of the two-sided grinding device disclosed in an embodiment of the present invention;

[0048] Figure 4 This is a perspective view of the two-sided grinding device disclosed in an embodiment of the present invention;

[0049] Figure 5 This is an overall structural diagram of the internal grinding device disclosed in an embodiment of the present invention;

[0050] Figure 6 This is a front view of the rack disclosed in an embodiment of the present invention;

[0051] in:

[0052] Frame 100, slide rail 101, positioning block 102;

[0053] Tail-end grinding device 200, first connecting block 201, first motor 202, contour grinding head 203, L-shaped hanging plate 204, first cylinder 205;

[0054] The two-sided grinding device 300, the second connecting block 301, the side grinding head assembly 302, the suspension bar 303, the arc-shaped grinding head 304, and the second cylinder 305;

[0055] Internal grinding device 400, third connecting block 401, second motor 402, internal grinding head 403, third cylinder 404;

[0056] First dust collection plate 500, second dust collection plate 501, dust cover 502. Detailed Implementation

[0057] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without novelty are within the scope of protection of the present invention.

[0058] In the description of this invention, it should be understood that the terms "upper," "lower," "top surface," "bottom surface," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the indicated position or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0059] like Figures 1-6As shown, the automatic grinding machine disclosed in this invention is used for grinding parts to be ground. It includes a frame 100, a tail grinding device 200, side grinding devices 300, and an internal grinding device 400. The frame 100 is trough-shaped. The tail grinding device 200, side grinding devices 300, and internal grinding device 400 are sequentially arranged inside the frame 100 and can move linearly along the frame 100. The tail grinding device 200 grinds the tail of the part to be ground, the side grinding devices 300 grind the outer wall of the part to be ground, and the internal grinding device 400 grinds the inner wall of the part to be ground. Specifically, the frame 100 can be funnel-shaped, as long as it can accommodate the tail grinding device 200, the side grinding devices 300, and the internal grinding device 400. The parts to be ground include, but are not limited to, parts with burrs after production, such as ceramic filter cartridges. Furthermore, when the part to be repaired is a ceramic filter cartridge, the tail repair device 200 is used to repair the tail protrusion of the ceramic filter cartridge, the two side repair devices 300 are used to repair the rough edges of the mold joint on both sides of the ceramic filter cartridge, and the internal repair device 400 is used to repair the inner wall of the flange of the ceramic filter cartridge. The automatic grinding machine provided by this invention, when in use, has the workpiece to be ground arranged inside the frame 100. The tail grinding device 200 and the internal grinding device 400 move linearly on the frame 100 until the tail grinding device 200 contacts the tail of the workpiece to be ground and the internal grinding device 400 contacts the inner wall of the workpiece to be ground. At this time, the two grinding devices 300 on both sides act on the outer wall of the workpiece to be ground, so as to realize the simultaneous grinding of the tail, inner wall and outer wall of the workpiece to be ground, thereby saving manpower and improving the grinding efficiency of the workpiece to be ground. When the automatic grinding machine is applied to grinding ceramic filter cartridges, it can improve the grinding efficiency of ceramic filter cartridges. The following description all take ceramic filter cartridges as an example of the workpiece to be ground.

[0060] To optimize the above technical solution, a slide rail 101 is arranged on the first side of the frame 100, allowing the tail grinding device 200, the side grinding devices 300, and the internal grinding device 400 to slide along the slide rail 101. Specifically, the tail grinding device 200, the side grinding devices 300, and the internal grinding device 400 adjust their positions by sliding along the slide rail 101, so that the tail grinding device 200 abuts against the tail of the ceramic filter cartridge, and the internal grinding device 400 fits against the inner wall of the flange of the ceramic filter cartridge, thus limiting and grinding the ceramic filter cartridge. At the same time, the side grinding devices 300 slide along the slide rail 101, grinding the rough edges of the mold joints on both sides of the ceramic filter cartridge while sliding. Therefore, this arrangement can limit the ceramic filter cartridge on one hand and achieve effective grinding on the other, thereby saving time and improving grinding efficiency.

[0061] To optimize the above technical solution, a positioning block 102 is arranged inside the frame 100. The positioning block 102 is used to limit the workpiece to be repaired. Specifically, the positioning block 102 can have various forms, including but not limited to a V-shape in which the ceramic filter cartridge is clamped; or two opposing vertical blocks in which the ceramic filter cartridge is clamped between the two vertical blocks. The present invention preferably uses a V-shape for the positioning block 102. In use, the positioning block 102 is arranged at the bottom of the frame 100. The operator places the ceramic filter cartridge on the V-shaped positioning block 102. The two sides of the V-shaped positioning block 102 limit the ceramic filter cartridge, thereby preventing the ceramic filter cartridge from shifting and ensuring the repair effect of the automatic repair machine.

[0062] To optimize the above technical solution, the tail grinding device 200 includes a first connecting block 201, a first cylinder 205, a first motor 202, and a contour grinding head 203. The first cylinder 205 is arranged on the second side of the frame 100. The first end of the first connecting block 201 is connected to the slide rail 101, and the second end of the first connecting block 201 is connected to the first cylinder 205. The first cylinder 205 is used to drive the first connecting block 201 to feed linearly along the slide rail 101. The first motor 202 is fixed to the first connecting block 201 and connected to the contour grinding head 203, and is used to drive the contour grinding head 203 to rotate. The contour grinding head 203 is used to grind the tail of the workpiece to be ground. Specifically, the shapes of the first connecting block 201, the second connecting block 301, and the third connecting block 401 are identical. Correspondingly, a slider is arranged on the slide rail 101. The first ends of the first connecting block 201, the second connecting block 301, and the third connecting block 401 are all connected to the slider on the slide rail 101 to achieve movement along the slide rail 101. Further, the tail grinding device 200 includes an L-shaped hanging plate 204. The first end of the L-shaped hanging plate 204 is connected to the first connecting block 201, and its second end is used to fix the first motor 202 so that the first motor 202 sinks into the interior of the frame 100.

[0063] In use, the first cylinder 205 drives the first connecting block 201 to move along the slide rail 101 until the profile grinding head 203 contacts the tail of the ceramic filter cartridge. The first motor 202 controls the profile grinding head 203 to rotate. The profile grinding head 203 grinds the protrusions at the tail of the ceramic filter cartridge, realizing automated grinding of the tail of the ceramic filter cartridge and improving the grinding efficiency of the ceramic filter cartridge.

[0064] To optimize the above technical solution, the two-sided grinding device 300 includes a second connecting block 301, a second cylinder 305, and a side grinding head assembly 302. The second cylinder 305 is located on the second side of the frame 100. The first end of the second connecting block 301 is connected to the slide rail 101, and the second end of the second connecting block 301 is connected to the second cylinder 305. The second cylinder 305 drives the second connecting block 301 to feed linearly along the slide rail 101. The side grinding head assembly 302 is fixed to the second connecting block 301. Specifically, since the side grinding head assembly 302 only needs to grind the outer wall of the workpiece, it does not need to rotate; only linear movement of the side grinding head assembly 302 is required. In use, the second cylinder 305 drives the second connecting block 301 to move along the slide rail 101 until the side grinding head assembly 302 grinds the rough edges of the mold joint on both sides of the ceramic filter cartridge, thereby realizing automated grinding of the outer wall of the ceramic filter cartridge and improving the grinding efficiency of the ceramic filter cartridge.

[0065] To optimize the above technical solution, two side grinding head assemblies 302 are provided and arranged opposite each other. Each side grinding head assembly 302 includes a suspension bar 303 and an arc-shaped grinding head 304. The first end of the suspension bar 303 is connected to the second connecting block 301, and the second end is connected to the arc-shaped grinding head 304, which is used to grind the outer wall of the part to be ground. Specifically, the suspension bar 303 allows the arc-shaped grinding head 304 to sink into the interior of the frame 100 for easier grinding of the part. Specifically, the two arc-shaped grinding heads 304 are arranged opposite each other, and their length can be changed according to usage needs to grind parts of various diameters. When grinding the entire outer wall of the part to be ground is required, the arc-shaped grinding heads 304 can be joined together to form a complete circle. In use, the two arc-shaped grinding heads 304 move back and forth along a straight line to grind the rough edges of the mold joints on both sides of the ceramic filter cartridge, thereby improving the grinding efficiency of the ceramic filter cartridge.

[0066] To optimize the above technical solution, the arc-shaped grinding head 304 is made of a flexible material, and sandpaper is adhered to the side of the arc-shaped grinding head 304 closest to the workpiece to be ground. Specifically, the arc-shaped grinding head 304 is made of an elastic, flexible material, and the longest distance between the two arc-shaped grinding heads 304 is less than the diameter of the ceramic filter cartridge, so that the two arc-shaped grinding heads 304 press against the outer wall of the ceramic filter cartridge for grinding, improving the grinding efficiency of the ceramic filter cartridge. In use, the operator can use Velcro to attach the sandpaper to the side of the arc-shaped grinding head 304 closest to the ceramic filter cartridge for easy sandpaper replacement and to improve the grinding precision of the ceramic filter cartridge.

[0067] To optimize the above technical solution, the internal grinding device 400 includes a third connecting block 401, a third cylinder 404, a second motor 402, and an internal grinding head 403. The third cylinder 404 is arranged on the second side of the frame 100. The first end of the third connecting block 401 is connected to the slide rail 101, and the second end of the third connecting block 401 is connected to the third cylinder 404. The third cylinder 404 is used to drive the third connecting block 401 to feed linearly along the slide rail 101. The second motor 402 is fixed to the third connecting block 401 and connected to the internal grinding head 403, and is used to drive the internal grinding head 403 to rotate. The internal grinding head 403 is used to grind the inner wall of the workpiece to be ground. Specifically, the first cylinder 205, the second cylinder 305, the third cylinder 404, the first motor 202, and the second motor 402 are all controlled by PLC. The first cylinder 205, the second cylinder 305, and the third cylinder 404 are all rodless cylinders. The linear feed of the rodless cylinders drives the movement of the tail grinding device 200 and the internal grinding device 400. The rotation of the first motor 202 drives the rotation of the profile grinding head 203. The rotation of the second motor 402 drives the rotation of the inner cylindrical grinding head 403. The linear feed of the second cylinder 305 drives the linear movement of the grinding devices 300 on both sides, so as to achieve the grinding of the tail protrusions, mold seam burrs, and flange inner wall of the ceramic filter cartridge. Furthermore, the inner grinding head 403 is a multi-bladed sandpaper grinding head. The outer diameter of the inner grinding head 403 is slightly larger than the inner diameter of the ceramic filter cartridge. In use, the inner grinding head 403 extends into the interior of the ceramic filter cartridge, and the second motor 402 drives the inner grinding head 403 to rotate, so as to realize the automatic grinding of the inner wall of the ceramic filter cartridge, thereby improving the grinding efficiency of the ceramic filter cartridge.

[0068] To optimize the above technical solution, multiple through holes are provided at the bottom of the frame 100. The automatic grinding machine also includes a negative pressure fan, the pipes of which are connected to the through holes. The negative pressure fan is used to remove dust from inside the frame 100. Specifically, the multiple through holes are arranged at the bottom of the positioning block 102. During use, the negative pressure fan can be turned on during or after grinding the ceramic filter cartridge. A negative pressure is formed in the pipes of the negative pressure fan, drawing the dust generated during grinding into the inside of the pipes, thereby cleaning the production environment when the automatic grinding machine is used and realizing its environmental protection function.

[0069] To optimize the above technical solution, the automatic grinding machine also includes a first dust collection plate 500, a second dust collection plate 501, and a dust cover 502. The first dust collection plate 500 and the second dust collection plate 501 are respectively arranged on both sides of the positioning block 102. The dust cover 502 is groove-shaped and connected to the frame 100 to cover the frame 100. The dust cover 502 can extend and retract horizontally along the frame 100. Specifically, the first dust collection plate 500 is arranged between the slide rail 101 and the positioning block 102, and the second dust collection plate 501 is arranged between the positioning block 102 and the first cylinder 205, the second cylinder 305, and the third cylinder 404, to isolate the slide rail 101, the first cylinder 205, the second cylinder 305, and the third cylinder 404 from the dust generated during grinding, thus extending their service life. Specifically, the dust cover 502 of the present invention is preferably a bellows cover. When it is necessary to take or put the part to be repaired, the dust cover 502 is retracted. When it is necessary to repair the part to be repaired, the dust cover 502 is extended to cover the frame 100. With the help of a negative pressure fan, dust leakage can be further avoided, thus improving the environmental performance of the automatic repair machine.

[0070] The advantages of this invention are:

[0071] (1) Improved the grinding efficiency of ceramic filter cartridges;

[0072] (2) It saves manpower and achieves high polishing precision;

[0073] (3) The grinding process is environmentally friendly and highly practical.

[0074] It should be noted that the automatic grinding machine provided by this invention can be used in the field of grinding equipment technology or other fields. Other fields refer to any field other than the field of grinding equipment technology. The above are merely examples and do not limit the application areas of the automatic grinding machine provided by this invention.

[0075] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0076] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0077] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0078] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An automatic grinding machine, characterized in that, Used for grinding parts to be ground, including a frame, a tail grinding device, side grinding devices, and an internal grinding device, wherein: The frame is trough-shaped; The tail grinding device, the two side grinding devices, and the internal grinding device are arranged sequentially inside the frame and can move along a straight line on the frame; The tail grinding device is used to grind the tail of the workpiece to be ground. The two-sided grinding devices are used to grind the outer wall of the workpiece to be ground. The internal grinding device is used to grind the inner wall of the part to be ground. A slide rail is arranged on the first side of the frame, and the tail grinding device, the two side grinding devices and the internal grinding device can slide along the slide rail; The tail-end grinding device includes a first connecting block, a first cylinder, a first motor, and a contour grinding head, wherein: the first cylinder is arranged on the second side of the frame; the first end of the first connecting block is connected to the slide rail, and the second end of the first connecting block is connected to the first cylinder; the first cylinder is used to drive the first connecting block to feed linearly along the slide rail; the first motor is fixed to the first connecting block and connected to the contour grinding head, and is used to drive the contour grinding head to rotate; the contour grinding head is used to grind the tail end of the workpiece to be ground; the tail-end grinding device includes an L-shaped hanging plate, the first end of the L-shaped hanging plate is connected to the first connecting block, and the second end of the L-shaped hanging plate is used to fix the first motor, so that the first motor sinks into the interior of the frame; The two-sided grinding device includes a second connecting block, a second cylinder, and a side grinding head assembly, wherein: the second cylinder is arranged on the second side of the frame; the first end of the second connecting block is connected to the slide rail, and the second end of the second connecting block is connected to the second cylinder; the second cylinder is used to drive the second connecting block to feed linearly along the slide rail; the side grinding head assembly is fixed to the second connecting block; The side grinding head assembly consists of two parts, arranged opposite to each other; each side grinding head assembly includes a suspension bar and an arc-shaped grinding head; the first end of the suspension bar is connected to the second connecting block, and the second end is connected to the arc-shaped grinding head; the suspension bar is used to allow the arc-shaped grinding head to sink into the interior of the frame; the arc-shaped grinding head is used to grind the outer wall of the workpiece to be ground. The arc-shaped grinding head is made of flexible material; sandpaper is adhered to the side of the arc-shaped grinding head closest to the workpiece to be repaired.

2. The automatic grinding machine as described in claim 1, characterized in that, The frame is equipped with positioning blocks, which are used to limit the position of the workpiece to be repaired.

3. The automatic grinding machine as described in claim 1, characterized in that, The internal grinding device includes a third connecting block, a third cylinder, a second motor, and an internal grinding head, wherein: The third cylinder is arranged on the second side of the frame; The first end of the third connecting block is connected to the slide rail, and the second end of the third connecting block is connected to the third cylinder; The third cylinder is used to drive the third connecting block to feed linearly along the slide rail; The second motor is fixed to the third connecting block and connected to the inner grinding head, and is used to drive the inner grinding head to rotate; The internal grinding head is used to grind the inner wall of the workpiece to be repaired.

4. The automatic grinding machine as described in any one of claims 1-3, characterized in that, The bottom of the frame has multiple through holes; The automatic grinding machine also includes a negative pressure fan, the pipes of which are connected to the through hole, and the negative pressure fan is used to remove dust from inside the frame.

5. The automatic grinding machine as described in claim 2, characterized in that, The automatic grinding machine also includes a first dust collection plate, a second dust collection plate, and a dust cover, wherein: The first dust collection plate and the second dust collection plate are respectively arranged on both sides of the positioning block; The dust cover is groove-shaped and connected to the frame to cover the frame; The dust cover can extend and retract horizontally along the frame.

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