Device for preventing dust from falling from dust box of sweeper

Abstract

An embodiment of the present invention discloses a device for preventing dust from falling from a dust box of a sweeper, comprising a storage box chamber arranged in a sweeper body, a dust box connected to the storage box chamber, and a wind roller connected to the sweeper body and used for rolling dust into the storage box chamber is arranged on the right side of the storage box chamber, an air suction port is opened at a position corresponding to the wind roller on the side wall of the storage box chamber, and a dust blocking structure is installed in the air suction port. The device can seal and block the air suction port by a flap installed at the air suction port to prevent dust at the dust box from falling again. During its specific implementation, the torsion springs on both sides of the flap will always push the flap to ensure that the flap has enough force to tightly close the dust suction port. Even if the sweeper produces a large vibration, the dust in the sweeper will not easily leak out from the dust suction port due to the obstruction of the flap.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of sweeping machines, and particularly to a device for preventing dust from falling from a dust box of a sweeping machine. Background Art

[0002] A sweeping robot, also known as an automatic sweeper, smart vacuum, or robot vacuum cleaner, is a type of smart home appliance that uses artificial intelligence to automatically clean floors. It typically uses a brushing and vacuuming method to collect debris from the floor into its own trash collection box, completing the cleaning process. Generally speaking, any robot that performs sweeping, vacuuming, and mopping is also categorized as a sweeping robot. While sweeping robots have numerous components, one of the most important is the dust collection box.

[0003] The common vacuum cleaner boxes for sweepers on the market are detachable and reusable. In order to allow the dust rolled up by the sweeper to enter the dust box, a dust suction port is opened at the dust box. After the dust suction port is opened, some sweeping robots do not have any cover at the dust suction port, while others add a barrier sheet inside the dust box. When the user pulls out the dust box, the dust suction port can be closed by relying on the gravity of the barrier sheet, so that the dust will not easily fall out of the dust box. However, due to the light weight of the barrier sheet, it cannot completely close the dust suction port during actual use. If the sweeper generates some vibration, the dust in the dust box is very likely to fall again. Summary of the Invention

[0004] To this end, an embodiment of the present invention provides a device for preventing dust from falling from the dust box of a sweeping robot, so as to solve the problem in the prior art that some sweeping robots have no cover at the dust suction port, while some have a barrier plate added inside the dust box. When the user pulls out the dust box, the dust suction port can be closed by relying on the gravity of the barrier plate, so that dust will not easily fall out of the dust box. However, since the barrier plate is designed to be light in weight, it cannot completely close the dust suction port during actual use. If the sweeping robot generates partial vibration, the dust in the dust box is very likely to fall again.

[0005] In order to achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] A device for preventing dust from falling from a dust box of a sweeping machine comprises a storage box chamber arranged in a sweeping machine body, a dust box connected to the storage box chamber, and a wind drum connected to the sweeping machine body and used to roll dust into the storage box chamber is arranged on the right side of the storage box chamber, a suction port is opened at a position corresponding to the wind drum on the side wall of the storage box chamber, and a dust blocking structure is installed in the suction port;

[0007] The dust-blocking structure includes a rotating shaft located inside the air suction port, a flap is sleeved on the side wall of the rotating shaft, and a torsion spring is sleeved on the end side wall of the rotating shaft for pushing the flap to tightly press the air suction port, a trigger plate is installed at the surface of the flap and at a position corresponding to the torsion spring, and a roller brush cover is provided below the flap, which is connected to the sweeper body and limits the trigger plate.

[0008] As a preferred solution of the present invention, a dust scraping strip is installed on the surface of the flap on one side close to the air suction port.

[0009] As a preferred solution of the present invention, there are two torsion springs, and the two torsion springs are respectively located at two ends of the rotating shaft.

[0010] As a preferred solution of the present invention, the height of the flap is greater than the height of the air exhaust port on the side wall of the dust box, and the positions of the air exhaust port and the air suction port correspond to each other.

[0011] As a preferred solution of the present invention, a sealing mechanism is provided on the inner wall of the exhaust port, and the sealing mechanism includes a shielding film connected to the inner wall of the exhaust port at one end and connected to the surface of the flap at the other end, and a stretching groove with a C-shaped cross-section is provided on the shielding film, and an auxiliary stretching groove is provided on the stretching groove.

[0012] As a preferred solution of the present invention, a sealing rubber block is installed on the inner wall of the air exhaust port, a fixed boss is installed on the surface of the flap, and a boss limiting groove for limiting the fixed boss is opened in the sealing rubber block.

[0013] As a preferred solution of the present invention, an anti-backflow mechanism is provided at a position corresponding to the inner wall of the dust collector box and the air suction port, and the anti-backflow mechanism includes a fixed column connected to the inner wall of the dust collector box, and a mounting frame is connected to the fixed column, and a plurality of inclined plates are installed on the mounting frame, and a guide column connected to the mounting frame is provided between adjacent inclined plates.

[0014] As a preferred solution of the present invention, a deflection plate connected to the inner wall of the bottom of the dust box is provided below the mounting frame, a hooking strip is connected to the end of the deflection plate away from the dust box, and a pushing spring connected to the dust box is installed on the surface of the deflection plate, a hook platform is installed on the surface of the hooking strip, a rotating piece is connected to the inner wall of the air suction port, a hook column for hooking the hook platform is installed on the side wall of the rotating piece, and an inclined column pushed by the shielding film is installed on the rotating piece.

[0015] As a preferred solution of the present invention, an adjusting block for pushing the deflection plate is installed at the bottom of the dust collector box, and an adjusting bevel is provided on the side of the adjusting block close to the inner wall of the bottom of the dust collector box. The length of the adjusting bevel is set to increase linearly, and an adjusting column that passes through the dust collector box is installed on the surface of the adjusting block.

[0016] The embodiments of the present invention have the following advantages:

[0017] The device can seal the suction port by installing a flap at the suction port to prevent dust from falling into the dust box again. When it is implemented, the torsion springs on both sides of the flap will always push the flap to ensure that the flap has enough force to tightly close the dust suction port. Even if the sweeper vibrates greatly, the dust in the sweeper will not easily leak out of the dust suction port due to the obstruction of the flap. When the flap is closed, the shielding film and the sealing rubber block can play an auxiliary sealing role to prevent the flap from being loosely closed due to the attenuation of the torsion spring elastic force, causing dust to splash out. At the same time, the shielding film can also prevent debris from getting stuck at the connection between the flap and the suction port, thereby preventing the torsion spring from getting stuck.

[0018] The present invention can also prevent lint and other debris from being sucked in too much and thus overflowing or being scraped away by the inclined sheets, guide posts and deflector plates. During its specific implementation, if lint and other debris are sucked into the dust box, they will first be guided into the dust box by the inclined sheets and will not hit the inner wall of the dust box and flow back with the wind. After entering the box, the inclined sheets can block the debris. If there is a lot of debris accumulated in the box, once the dust box is pulled out, the deflector plate will be pushed by the blocking film to break away from the restriction of the hook post and flip toward the inside of the dust box. In this way, the debris accumulated at the air intake port can be brought back, preventing the debris from being scraped away by the air intake port. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are intended only to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in sizes, without affecting the efficacy and objectives of the present invention, shall still fall within the scope of the technical contents disclosed herein.

[0021] Figure 1A three-dimensional diagram of a dust shield structure according to an embodiment of the present invention;

[0022] Figure 2 A three-dimensional diagram of a dust collection box according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic cross-sectional structural diagram of a flap door in a closed state according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the cross-sectional structure of the flap door when it is opened according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic structural diagram of the trigger piece in contact with the roller brush cover according to an embodiment of the present invention;

[0026] Figure 6 A three-dimensional diagram of a flap door according to an embodiment of the present invention;

[0027] Figure 7 Schematic diagram of the anti-backflow mechanism structure according to an embodiment of the present invention;

[0028] Figure 8 This is a schematic structural diagram of a sealing mechanism according to an embodiment of the present invention;

[0029] Figure 9 A top view of an inclined sheet according to an embodiment of the present invention;

[0030] Figure 10 A bottom view of a maneuvering block according to an embodiment of the present invention;

[0031] Figure 11 This is a schematic structural diagram of a deflection plate when being hooked according to an embodiment of the present invention;

[0032] Figure 12 This is a front view of the inclined piece according to an embodiment of the present invention.

[0033] In the picture:

[0034] 1-Dust box; 2-Flap door; 3-Trigger plate; 4-Torsion spring; 5-Roller brush cover; 6-Rotating shaft; 7-Scrubber strip; 8-Sweeper body; 9-Storage box chamber; 10-Dust shield; 11-Air blower; 12-Sealing mechanism; 13-Anti-return mechanism;

[0035] 901-air intake;

[0036] 1201-blocking film; 1202-stretching groove; 1203-auxiliary pulling groove; 1204-sealing rubber block; 1205-fixing boss; 1206-boss limiting groove;

[0037] 1301-fixed column; 1302-mounting frame; 1303-tilted plate; 1304-guide column; 1305-deflection plate; 1306-hook bar; 1307-push spring; 1308-hook platform; 1309-rotating plate; 1310-hook column; 1311-tilted column; 1312-adjusting block; 1313-adjusting inclined slot; 1314-adjusting column. DETAILED DESCRIPTION

[0038] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0039] like Figure 1 As shown, the present invention provides a device for preventing dust from falling from a dust box of a sweeper, which can seal and block the air suction port 901 through a flap 2 installed at the air suction port.

[0040] like Figure 3 and Figure 4 As shown, the device includes a storage box chamber 9 arranged in the sweeper body 8, a dust box 1 is connected to the storage box chamber 9, and a wind drum 11 connected to the sweeper body 8 and used to roll dust into the storage box chamber 9 is provided on the right side of the storage box chamber 9, and an air suction port 901 is opened at a position corresponding to the side wall of the storage box chamber 9 and the wind drum 11, and a dust blocking structure 10 is installed in the air suction port 901.

[0041] When the device is in use, if the dust box 1 is not inserted into the storage box chamber 9, the dust shielding structure 10 will seal the air suction port 901, thereby preventing the air suction port 901 from being loosely closed and causing dust to fall again. If the user then inserts the dust box 1 into the storage box chamber 9, the dust shielding structure 10 will gradually open as the dust box 1 is inserted until it can no longer move.

[0042] like Figure 1 、 Figure 5 、 Figure 6 and Figure 2 As shown, the dust-blocking structure 10 includes a rotating shaft 6 located inside the air suction port 901, a flap 2 is sleeved on the side wall of the rotating shaft 6, and a torsion spring 4 is sleeved on the end side wall of the rotating shaft 6 for pushing the flap 2 to tightly press the air suction port 901, a trigger plate 3 is installed at the surface of the flap 2 at a position corresponding to the torsion spring 4, and a roller brush cover 5 is provided below the flap 2, which is connected to the sweeper body 8 and limits the trigger plate 3.

[0043] The dust blocking structure 10 can directly seal the air suction port 901 when the dust box 1 is not inserted. In its specific implementation, the torsion spring 4 will push the flap 2 to press the air suction port 901 through its own torque, so that the air suction port 901 is tightly closed. Even if the sweeper vibrates greatly, the dust in the storage box chamber 9 will not easily leak out from the air suction port 901. When the user continues to push and insert the dust box 1, the dust box 1 and the flap 2 will be pushed forward. When the trigger piece 3 of the flap 2 contacts the roller brush cover 5, the roller brush cover 5 will give the trigger piece 3 a force (this force can be directly applied to the flap 2, so that the flap 2 can rotate counterclockwise around the rotation axis 6). Once the user fully inserts the dust box 1 into the storage box chamber 9, due to the obstruction of the roller brush cover 5 (the obstruction force acts on the trigger piece 3 to brake and limit the trigger piece 3), the trigger piece 3 will rotate around the rotation axis 6, thereby driving the entire flap 2 to rotate, that is, the flap 2 will rotate synchronously with the advancement of the dust box 1 until it is fully opened.

[0044] The triggering piece 3, the flap 2 and the rotating shaft 6 are an integral whole. When the triggering piece 3 encounters resistance, the flap 2 will be restricted and thus rotate around the rotating shaft 6.

[0045] like Figure 1 and Figure 4 As shown, a dust scraping strip 7 is installed on the surface of the flap 2 on one side close to the air suction port 901 , and the height of the flap 2 is greater than the height of the air suction port on the side wall of the dust box 1 .

[0046] When the dust box 1 is fully inserted into the storage box chamber 9, the scraping strip 7 will rotate with the flap 2 until the scraping strip 7 is attached to the ground. After that, when the sweeper is working, the scraping strip 7 can play the role of scraping dust. At the same time, the size of the flap 2 should be larger than the exhaust port, so that there will be no large gap between the suction port 901 and the flap 2.

[0047] There are two torsion springs 4, and the two torsion springs 4 are respectively located at the two ends of the rotating shaft 6. The torsion springs 4 are arranged in this way to ensure that the torque applied to the rotating shaft 6 is sufficient to prevent the flap 2 from automatically flipping over and releasing the air intake 901 due to insufficient torque of the torsion spring 4.

[0048] like Figure 7 and Figure 8 As shown, the inner wall of the exhaust port is provided with a sealing mechanism 12, and the sealing mechanism 12 includes a shielding film 1201 connected to the inner wall of the exhaust port at one end and connected to the surface of the flap 2 at the other end, and a stretching groove 1202 with a C-shaped cross-section is provided on the shielding film 1201, and an auxiliary stretching groove 1203 is provided on the stretching groove 1202.

[0049] The sealing mechanism 12 can enhance the sealing effect of the flap 2 so that waste will not be easily stuck between the flap 2 and the air outlet. In its specific implementation, if the flap 2 is in a closed state, the shielding film 1201 will be Figure 2 The state shown is presented, and the gap between the flap 2 and the exhaust port is blocked. Once the flap 2 is flipped open, the shielding film 1201 will be gradually stretched, and at the same time, the stretching groove 1202 and the auxiliary pulling groove 1203 will be flattened until the flap 2 is fully opened. At this time, the shielding film 1201 will be attached to the flap 2 (as shown in the specific embodiment). Figure 7 As shown), this avoids the phenomenon that debris is stuck between the flap 2 and the air outlet.

[0050] A sealing rubber block 1204 is installed on the inner wall of the air exhaust port, a fixing boss 1205 is installed on the surface of the flap 2 , and a boss limiting groove 1206 for limiting the fixing boss 1205 is opened in the sealing rubber block 1204 .

[0051] When the flap 2 is closed, the fixed boss 1205 on the surface of the flap 2 will be embedded in the boss limit groove 1206. At this time, the sealing between the flap 2 and the exhaust port is better. Even if the elastic force of the torsion spring 4 decays, due to the limitation of the sealing rubber block 1204, even if the dust box vibrates greatly, the flap 2 will not shake easily to shake out the dust.

[0052] like Figure 7 、 Figure 8 、 Figure 9 and Figure 12 As shown, an anti-backflow mechanism 13 is provided at a position corresponding to the inner wall of the dust collector box 1 and the air suction port 901. The anti-backflow mechanism 13 includes a fixed column 1301 connected to the inner wall of the dust collector box 1, and a mounting frame 1302 is connected to the fixed column 1301. A plurality of inclined plates 1303 are installed on the mounting frame 1302, and a guide column 1304 connected to the mounting frame 1302 is provided between adjacent inclined plates 1303.

[0053] The anti-backflow mechanism 13 can prevent the situation that when the debris enters the dust box along with the suction air, the suction air carries the debris and hits the inner wall of the dust box and brings the debris back. In its specific implementation, once the debris enters the dust box 1, the debris and the suction air will first contact the inclined piece 1303 (the inclined piece 1303 is as shown in FIG. Figure 9 As shown in the figure, the direction of the suction air changes and it will not directly impact the inner wall of the dust box, thus avoiding backflow. The debris will slide along the inclined surface of the inclined piece 1303 until it enters the dust box 1. If the debris is large in size, it will be stuck on the guide column 1304. At this time, the suction air will impact the debris and the guide column 1304 will rotate slightly, making it easier for the debris to enter.

[0054] like Figure 7 、 Figure 8 and Figure 11 As shown, a deflection plate 1305 connected to the inner wall of the bottom of the dust box 1 is provided below the mounting frame 1302, a hooking bar 1306 is connected to the end of the deflection plate 1305 away from the dust box 1, and a push-up spring 1307 connected to the dust box 1 is installed on the surface of the deflection plate 1305, a hook platform 1308 is installed on the surface of the hooking bar 1306, a rotating piece 1309 is connected to the inner wall of the air suction port 901, a hook column 1310 for hooking the hook platform 1308 is installed on the side wall of the rotating piece 1309, and an inclined column 1311 pushed by the shielding film 1201 is installed on the rotating piece 1309.

[0055] The anti-return mechanism 13 can also prevent debris from overflowing or a large amount of debris from being stuck at the air suction port 901. In its specific implementation, when the debris is absorbed, the user can remove the dust box 1. Since the flap 2 will seal the air suction port 901 after the dust box 1 is pulled out, once the flap 2 is closed, the shielding film 1201 will also be reset (specifically, Figure 8 As shown), the reset shielding film 1201 can push the tilting column 1311 to move slightly toward the inside of the box body, and then the movable tilting column 1311 can move together with the rotating piece 1309, and then the hook column 1310 will be separated from the hook platform 1308, so that the hooking bar 1306 is no longer under force, that is, the pushing spring 1307 can be reset, and then the pushing spring 1307 will push the deflection plate 1305 and the hooking bar 1306 to deflect toward the inside of the box, and at the same time push the debris accumulated at the mouth of the air suction port 901 into the box, thereby avoiding the situation where too much debris accumulates at the mouth and overflows, and at the same time, the debris entering the box will not be easily stuck between the air suction port 901 and the flap 2.

[0056] like Figure 7 、 Figure 8 and Figure 10 As shown, the bottom of the dust box 1 is equipped with a maneuvering block 1312 for pushing the deflection plate 1305. The maneuvering block 1312 is provided with an adjusting chute 1313 on one side close to the inner wall of the bottom of the dust box 1. The length of the adjusting chute 1313 is set to increase linearly. This is to enable the deflection plate 1305 to deflect within a certain area. When the length of the adjusting chute 1313 is at its minimum, its structure is as shown in FIG. Figure 8 As shown, when the slot length of the adjustment chute 1313 is at its maximum, its structure is as follows Figure 7 As shown, an adjusting column 1314 that passes through the dust collection box 1 is installed on the surface of the adjusting block 1312.

[0057] When the dust box is pulled out and the debris is discharged, the adjusting column 1314 can be slightly rotated so that it moves with the adjusting block 1312 until the adjusting block 1312 moves to the Figure 7Status shown (previously Figure 8 At this time, the deflector plate 1305 will be pushed by the inclined surface of the adjusting inclined slot 1313, thereby bringing the hooking bar 1306 to deflect toward the air suction port 901 until the hook platform 1308 hooks the hook column 1310 position again, after which the user can insert the dust box into the interior of the sweeper.

[0058] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made thereto. Therefore, such modifications and improvements, without departing from the spirit of the present invention, are intended to be within the scope of protection claimed herein.

Claims

1. A device for preventing dust from falling from a dust box of a sweeper, characterized in that: The utility model comprises a storage box chamber (9) arranged in a sweeping machine body (8), a dust collecting box (1) is connected in the storage box chamber (9), and a wind roller (11) connected to the sweeping machine body (8) and used for rolling dust into the storage box chamber (9) is arranged on the right side of the storage box chamber (9), a suction port (901) is opened at a position corresponding to the wind roller (11) on the side wall of the storage box chamber (9), and a dust blocking structure (10) is installed in the suction port (901); The dust-blocking structure (10) includes a rotating shaft (6) located inside the air suction port (901), a flap (2) is sleeved on the side wall of the rotating shaft (6), and a torsion spring (4) is sleeved on the end side wall of the rotating shaft (6) for pushing the flap (2) to tightly press the air suction port (901), a trigger plate (3) is installed at a position corresponding to the torsion spring (4) on the surface of the flap (2), and a roller brush cover (5) connected to the sweeper body (8) and limiting the trigger plate (3) is provided below the flap (2); An anti-return mechanism (13) is provided at a position corresponding to the inner wall of the dust collection box (1) and the air suction port (901), the anti-return mechanism (13) comprising a fixing column (1301) connected to the inner wall of the dust collection box (1), a mounting frame (1302) connected to the fixing column (1301), a plurality of inclined plates (1303) mounted on the mounting frame (1302), and a guide column (1304) connected to the mounting frame (1302) provided between adjacent inclined plates (1303); Once debris enters the dust collection box (1), the debris and the suction air first contact the inclined plate (1303). At this time, the flow direction of the suction air changes, and the debris slides along the inclined surface of the inclined plate (1303) until it enters the interior of the dust collection box (1). If the debris is large in size, the debris will be stuck at the guide column (1304). At this time, the suction air impacts the debris and the guide column (1304) rotates, making it easier for the debris to enter.

2. The device for preventing dust from falling from a dust box of a sweeper according to claim 1, characterized in that: The flap (2) is provided with a dust scraping strip (7) on the surface of one side close to the air suction port (901).

3. The device for preventing dust from falling from a dust box of a sweeper according to claim 1, characterized in that: There are two torsion springs (4) in total, and the two torsion springs (4) are respectively located at two ends of the rotating shaft (6).

4. The device for preventing dust from falling from a dust box of a sweeper according to claim 1, characterized in that: The height of the flap (2) is greater than the height of the air exhaust port on the side wall of the dust collection box (1), and the air exhaust port corresponds to the position of the air suction port (901).

5. The device for preventing dust from falling from a dust box of a sweeper according to claim 4, characterized in that: The inner wall of the air outlet is provided with a sealing mechanism (12), and the sealing mechanism (12) comprises a shielding film (1201) connected at one end to the inner wall of the air outlet on the side wall of the dust collection box (1), and connected at the other end to the surface of the flap (2), a stretching groove (1202) having a C-shaped cross-section is provided on the shielding film (1201), and an auxiliary stretching groove (1203) is provided on the stretching groove (1202).

6. The device for preventing dust from falling from a dust box of a sweeper according to claim 4, characterized in that: A sealing rubber block (1204) is installed on the inner wall of the air exhaust port, a fixed boss (1205) is installed on the surface of the flap (2), and a boss limiting groove (1206) for limiting the fixed boss (1205) is provided in the sealing rubber block (1204).

7. The device for preventing dust from falling from a dust box of a sweeper according to claim 1, characterized in that: A deflection plate (1305) connected to the inner wall of the bottom of the dust collection box (1) is provided below the mounting frame (1302); a hooking strip (1306) is connected to the end of the deflection plate (1305) away from the dust collection box (1); a push-up spring (1307) connected to the dust collection box (1) is installed on the surface of the deflection plate (1305); a hook platform (1308) is installed on the surface of the hooking strip (1306); a rotating piece (1309) is connected to the inner wall of the air suction port (901); a hook column (1310) for hooking the hook platform (1308) is installed on the side wall of the rotating piece (1309); and an inclined column (1311) pushed by the shielding film (1201) is installed on the rotating piece (1309).

8. The device for preventing dust from falling from a dust box of a sweeper according to claim 7, characterized in that: The bottom of the dust collection box (1) is provided with an adjustment block (1312) for pushing the deflection plate (1305); an adjustment inclined groove (1313) is provided on a side of the adjustment block (1312) close to the inner wall of the bottom of the dust collection box (1); the groove length of the adjustment inclined groove (1313) is arranged to have a linear increasing trend; and an adjustment column (1314) penetrating the dust collection box (1) is provided on the surface of the adjustment block (1312).

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