Laser cutting dust removal mechanism

Abstract

The utility model provides a dust removal mechanism for laser cutting, which is used for dust removal operation during laser cutting of plates and comprises a dust removal box component, a dust collection port is arranged on the dust removal box component and corresponds to a preset cutting position of a to-be-cut plate, and the dust collection port is arranged on the dust removal box component and corresponds to the preset cutting position of the to-be-cut plate. The dust removal box assembly can collect and store molten slag generated by laser cutting; the scraping plate assembly comprises scraping pieces arranged at the two ends of the dust collecting opening, a shielding piece arranged on the inner side of the dust collecting opening in a sliding mode along a closed path, and a driving mechanism for driving the shielding piece to slide; when a plate to be cut is cut above the dust collection opening, the shielding piece can prevent slag from making contact with the inner wall of the dust collection opening, and when the driving mechanism drives the shielding piece to slide along the closed path, the scraping piece can scrape the slag adhering to the shielding piece. According to the laser cutting dust removal mechanism, the cutting quality of laser cutting can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to laser cutting technical field, especially relates to a laser cutting dust removal mechanism. BACKGROUND

[0002] In the laser cutting operation project, especially in the scene involving the cutting task of the relatively fixed position, due to the sparks and slag generated in the cutting process, the position thereof is relatively stable distribution area relative to the dust removal box configured. With the continuous cutting operation, the cutting spark area is easy to accumulate slag, and these slag are formed by the materials melted in the high-temperature cutting process and rapidly cooled and solidified, and with the lapse of time, the continuous expansion of the accumulated slag volume begins to seriously hinder the normal discharge path of the cutting spark.

[0003] The blocked spark discharge will cause the high-temperature spark to be forced to change direction, and even the phenomenon of reverse folding occurs, the spark folded back carries extremely high heat, directly acts on the surface of the cutting plate, causes the local area of the plate to suffer additional heat radiation and burning, and thus the blackening phenomenon occurs. When the accumulation reaches a certain scale, the adhesion phenomenon between the slag also begins to become increasingly common, which will cause further blockage of the dust collection port of the dust removal box, and further deteriorate the spark discharge condition, so that the surface quality of the cutting plate is reduced, thereby causing the significant decline of the cutting quality. SUMMARY

[0004] Therefore, the utility model aims at providing a dust removal mechanism to improve the cutting quality of laser cutting.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] A laser cutting dust removal mechanism for dust removal operation when cutting plate by laser, the dust removal mechanism comprises:

[0007] A dust removal box assembly is provided with a dust collection port on the dust removal box assembly, the dust collection port is arranged corresponding to the preset cutting position of the cutting plate, and the dust removal box assembly can collect and store the slag generated by laser cutting;

[0008] A scraper assembly comprises a scraping part arranged at both ends of the dust collection port, a shielding part slidingly arranged inside the dust collection port along a closed path, and a driving mechanism driving the shielding part to slide;

[0009] When the cutting plate is cut above the dust collection port, the shielding part can block the slag from contacting the inner wall of the dust collection port, and when the driving mechanism drives the shielding part to slide along the closed path, the scraping part can scrape the slag adhered to the shielding part.

[0010] Further, the dust removal box assembly comprises a box body with a containing cavity, and a negative pressure mechanism for generating negative pressure in the containing cavity; the dust collection port is arranged on the top of the box body, and the negative pressure mechanism generates negative pressure in the box body so that the molten slag enters the box body through the dust collection port.

[0011] Further, the box body is provided with a slag removal mechanism below, and the bottom of the box body is provided with a communication port facing the slag removal mechanism.

[0012] Further, the slag removal mechanism comprises a slag box, universal wheels arranged below the slag box, and a hand holding part arranged on the slag box; the communication port communicates with the slag box so that the molten slag enters the slag box.

[0013] Further, the box body is provided with a guide plate, which is arranged downwardly and obliquely from the inner side wall of the box body.

[0014] Further, the negative pressure mechanism comprises a fan arranged on the box body, which can discharge the gas in the box body to the outside to generate negative pressure in the box body.

[0015] Further, the shielding member is a ring structure made of Teflon material.

[0016] Further, the driving mechanism comprises a driving part and a driven part arranged at two ends of the dust collection port respectively, and the shielding member is a ring structure sleeved on the driving part and the driven part; the driving part comprises a driving motor, a driving wheel arranged on the power output end of the driving motor; the driven part comprises a rotating shaft, a bearing sleeved on the rotating shaft, and a driven wheel arranged on the bearing; when the driving motor drives the driving wheel to rotate, the shielding member can be driven to rotate the driven wheel, so that the shielding member is arranged in the dust collection port along the closed path.

[0017] Further, the scraping member comprises a first scraper arranged on one side of the driving part, and a second scraper arranged on one side of the driven part; the two side walls of the first scraper are respectively abutted on the inner side walls of the shielding member on one side of the driving part; the two side walls of the second scraper are respectively abutted on the inner side walls of the shielding member on one side of the driven part.

[0018] Further, the scraper assembly further comprises a tensioning part arranged on one side of the driven part, the tensioning part comprises a mounting plate arranged on the dust removal box assembly, and an elastic member arranged on the mounting plate; the mounting plate is provided with a sliding groove, the rotating shaft is slidingly arranged in the sliding groove, one end of the elastic member is connected to the mounting plate, and the other end of the elastic member is connected to the rotating shaft to constrain the position of the rotating shaft in the sliding groove.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] The laser cutting dust removal mechanism, through the setting of the dust removal box assembly, can collect and store the slag generated by laser cutting, through the setting of the scraper assembly, can shield the inner side of the dust collecting port, prevent the slag from directly contacting the side wall of the dust collecting port and adhering and accumulating on the dust collecting port, through the setting of the scraping part, can clean the slag adhered to the shielding part, ensure the smooth collection of the slag by the dust collecting port, can effectively avoid the accumulation of the slag on the dust collecting port causing the spark reflection to blacken the surface of the to-be-cut plate, thereby improving the cutting quality of the laser cutting mechanism.

[0021] In addition, through the setting of the negative pressure mechanism, negative pressure is generated in the containing cavity, which is convenient for collecting the slag generated by laser cutting, and the negative pressure is helpful for collecting the smoke dust generated by laser cutting, thereby improving the collection effect of the dust removal box assembly, and the structure is simple and convenient for design and implementation. Through the setting of the slag removal mechanism, the slag in the box body can be taken out, the box body is convenient for cleaning, the structure is simple, and the design and implementation are convenient. Through the setting of the universal wheel and the hand holding part, the slag box is convenient for being separated from the box body, thereby facilitating the transfer of the slag for subsequent treatment, the structure is simple, and the design and implementation are convenient. Through the setting of the guide plate, it is conducive to guiding the slag falling into the slag box, the slag is convenient for falling into the slag box, and the slag can be prevented from accumulating in the corner of the box body, the structure is simple, and the design and implementation are convenient.

[0022] In addition, through the setting of the fan, it is convenient to generate negative pressure in the box body, the structure is simple, and the design and implementation are convenient. Through the setting of the driving part, the driven part and the shielding part of the ring structure, the shielding part is convenient for sliding along the closed path in the dust collecting port, thereby facilitating the scraping of the slag on the shielding part by the scraping part, the structure is simple, and the design and implementation are convenient. The scraping part comprises first and second scrapers arranged on the driving side and the driven side respectively, which is convenient for scraping the slag adhered to the shielding part, the structure is simple, and the design and implementation are convenient. The shielding part is made of a ring-shaped structure made of Teflon material, which is conducive to reducing the slag adhered to the shielding part, and the design and implementation are convenient. Through the setting of the tensioning part, the shielding part is convenient for installation on the driving mechanism, and it is convenient to ensure that the shielding part is always in a tensioning state during sliding travel, the structure is simple, and the design and implementation are convenient. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings that constitute a part of the present application are used to provide a further understanding of the present application, and the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0024] Figure 1 The use state structure schematic view of the laser cutting dust removal mechanism described in the embodiments of the present application;

[0025] Figure 2 A structure schematic view of the laser cutting dust removal mechanism is shown in the embodiment of the utility model;

[0026] Figure 3 For Figure 2 A enlarged view of the A place of the laser cutting dust removal mechanism is shown in the embodiment of the utility model;

[0027] Figure 4 For Figure 2 A enlarged view of the B place of the laser cutting dust removal mechanism is shown in the embodiment of the utility model;

[0028] Figure 5 A internal structure schematic view of the laser cutting mechanism is shown in the embodiment of the utility model;

[0029] Mark explanation:

[0030] 1, dust removal box assembly;

[0031] 101, dust collecting port;102, box body;103, slag removal mechanism;

[0032] 1021, guide plate;1031, slag box;1032, universal wheel;1033, hand holding part;

[0033] 2, scraper assembly;

[0034] 201, scraping part;202, shielding part;203, driving mechanism;204, tensioning part;

[0035] 2031, driving part;2032, driven part;2033, take-up wheel set;2041, mounting plate;2042, elastic part;2043, sliding slot. Specific implementation

[0036] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0037] In the description of the utility model, it should be noted that if the terms indicating orientation or position relationship such as "up", "down", "inner", "outer" appear, its orientation or position relationship shown in the drawing is based on, only for the convenience of describing the utility model and simplifying the description, and it is not indicated or implied that the device or element must have a specific orientation, a specific orientation and operation, so it cannot be understood as a limitation of the utility model. In addition, if the terms "first", "second" appear, they are also used for description purposes only, and cannot be understood as indicating or implying relative importance.

[0038] In the laser cutting dust removal mechanism described in the utility model, the orientation words such as "up, down, left, right, front, back" used in the embodiment are defined with the up-down direction (also called height direction), left-right direction (also called width direction) and front-back direction (also called length direction) of the dust removal mechanism as the reference. "Inner, outer" is defined with the contour of the corresponding component as the reference, for example, "inner" and "outer" are defined with the contour of the dust removal mechanism as the reference, the side close to the middle of the dust removal mechanism is "inner", and vice versa is "outer".

[0039] In addition, in the description of the utility model, unless otherwise explicitly limited, the terms "mounting", "connecting", "connection" and "connecting piece" should be understood broadly. For example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood in combination with specific circumstances.

[0040] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0041] Embodiment one

[0042] The embodiment relates to a laser cutting dust removal mechanism, which aims to improve the cutting quality of laser cutting by optimizing the structure of the dust removal mechanism.

[0043] As shown in the overall structure, Figures 1 to 5 The laser cutting dust removal mechanism in the embodiment is used for dust removal operation when cutting plate materials by laser, and comprises a dust removal box assembly 1 and a scraper assembly 2.

[0044] The dust removal box assembly 1 is provided with a dust collection port 101, the dust collection port 101 is arranged at the preset cutting position of the to-be-cut plate material, and the dust removal box assembly 1 can collect and store the slag generated in laser cutting. The scraper assembly 2 comprises scraper pieces 201 arranged at both ends of the dust collection port 101, a shielding piece 202 slidingly arranged on the inner side of the dust collection port 101 along a closed path, and a driving mechanism 203 for driving the shielding piece 202 to slide. When the to-be-cut plate material is cut above the dust collection port 101, the shielding piece 202 can block the slag from contacting the inner wall of the dust collection port 101, and when the driving mechanism 203 drives the shielding piece 202 to slide along the closed path, the scraper pieces 201 can scrape off the slag adhered to the shielding piece 202.

[0045] As set forth above, the laser cutting dust removal mechanism of the embodiment can collect and store the slag generated by laser cutting through the setting of the dust removal box assembly 1, can shield the inner side of the dust collection port 101 through the setting of the scraper assembly 2, prevent the slag from directly contacting the side wall of the dust collection port 101 and adhering and accumulating on the dust collection port 101, and can clean the slag adhering to the shielding piece 202 through the setting of the scraping piece 201, thereby ensuring the smooth collection of the slag by the dust collection port 101 and effectively avoiding the accumulation of the slag on the dust collection port 101 to cause spark reflection and blackening of the surface of the to-be-cut plate, thereby facilitating the improvement of the cutting quality of the laser cutting mechanism.

[0046] Specifically, in the embodiment, as an exemplary structure, in combination with Figure 1 and Figure 2 shown, in order to facilitate the collection of slag, the dust removal box assembly 1 of the laser cutting dust removal mechanism in the embodiment includes a box body 102 having a containing cavity, and a negative pressure mechanism for creating negative pressure in the containing cavity. The dust collection port 101 is opened at the top of the box body 102, and negative pressure is created in the box body 102 by the negative pressure mechanism, so that the slag enters the box body 102 through the dust collection port 101. Through the setting of the negative pressure mechanism, negative pressure is created in the containing cavity, which facilitates the collection of slag generated by laser cutting, and the negative pressure helps to collect the smoke generated by laser cutting, thereby improving the collection effect of the dust removal box assembly 1, and the structure is simple and easy to design and implement.

[0047] In more detail, in combination with Figures 1 to 5 shown, the dust removal box assembly 1 in the embodiment further includes a slag removal mechanism 103 arranged below the box body 102. A communication port is opened at the bottom of the box body 102 towards the slag removal mechanism 103. Through the setting of the slag removal mechanism 103, the slag collected in the box body 102 can be taken out, which facilitates the cleaning of the box body 102, and the structure is simple and easy to design and implement.

[0048] The slag removal mechanism 103 in the embodiment includes a slag box 1031 arranged below the box body 102, universal wheels 1032 arranged below the slag box 1031, and a hand holding part 1033 arranged on the slag box 1031. The communication port communicates with the slag box 1031 to allow the slag to enter the slag box 1031. Through the setting of the universal wheels 1032 and the hand holding part 1033, the slag box 1031 can be easily separated from the box body 102, thereby facilitating the transportation of the slag for subsequent processing. The structure is simple and easy to design and implement.

[0049] It is worth mentioning that in combination with Figure 1 and Figure 5As shown, in order to better make the slag fall into the slag box 1031 and avoid the slag accumulation at the bottom of the slag box 1031, the box body 102 in the embodiment is internally provided with guide plates 1021 on both sides, the guide plates 1021 are inclinedly arranged from the inner side wall of the box body 102 downward, the arrangement of the guide plates 1021 is conducive to the guidance of the slag falling into the slag box 1031, facilitates the falling of the slag into the slag box 1031, and can prevent the slag from accumulating in the corners of the box body 102, and the structure is simple and conducive to design and implementation.

[0050] In addition, the negative pressure mechanism in the embodiment can for example include a fan arranged on the box body 102, the fan is communicated with the containing cavity inside the box body 102 through the opening arranged on the box body 102, the fan can discharge the gas in the box body 102 to the outside to create negative pressure in the box body 102, and the arrangement of the fan facilitates the creation of negative pressure in the box body 102, and the structure is simple and conducive to design and implementation. Of course, the negative pressure mechanism can also be connected with the smoke dust treatment device through a pipeline to treat the smoke dust in the discharged gas.

[0051] The scraper assembly 2 in the embodiment can shield the inner side of the dust collecting port 101 to prevent the slag from adhering to the inner side wall of the dust collecting port 101 to block the dust collecting port 101. Specifically, the driving mechanism 203 of the scraper assembly 2 in the embodiment includes a driving part 2031 and a driven part 2032 arranged at both ends of the dust collecting port 101 respectively, and the shielding piece 202 is in the form of a ring arranged on the driving part 2031 and the driven part 2032.

[0052] Among them, in combination with Figures 1 to 4 As shown, the driving part 2031 includes a driving motor, a driving wheel arranged on the power output end of the driving motor, the driven part 2032 includes a rotating shaft, a bearing arranged on the rotating shaft, and a driven wheel arranged on the bearing, when the driving motor drives the driving wheel to rotate, the shielding piece 202 can be driven to rotate the driven wheel to make the shielding piece 202 slide along the closed path inside the dust collecting port 101, through the arrangement of the driving part 2031, the driven part 2032 and the shielding piece 202 in the form of a ring, the sliding of the shielding piece 202 along the closed path in the dust collecting port 101 is facilitated, thereby facilitating the scraping of the slag on the shielding piece 202 by the scraping piece 201, and the structure is simple and conducive to design and implementation.

[0053] In more detail, in combination with Figure 2 and Figure 3 As shown, the driving wheel is further provided with convex ridges uniformly arranged along the circumferential direction of the driving wheel, through the arrangement of the convex ridges, the friction between the shielding piece 202 and the driving wheel is facilitated, and the sliding of the shielding piece 202 in the dust collecting port 101 by the driving mechanism 203 is facilitated.

[0054] It is worth mentioning that in order to facilitate the sliding of the shielding piece 202 inside the dust collecting opening 101, a tension wheel set 2033 is arranged between the driving part 2031 and the driven part 2032 and the dust collecting opening 101 respectively, the tension wheel set 2033 includes two tension wheels arranged oppositely, the shielding piece 202 passes through the gap between the two tension wheels, and the outer side wall of the shielding piece 202 abuts on the two tension wheels respectively.

[0055] In addition, the shielding piece 202 in the embodiment can be a ring structure made of Teflon material, so that the shielding piece 202 is a ring structure made of Teflon material, which is beneficial to reduce the adhered slag on the shielding piece 202 and facilitate design implementation.

[0056] The shielding piece 202 in the embodiment is sleeved on the driving part 2031 and the driven part 2032, and abuts on the scraping piece 201, when the shielding piece 202 slides along the closed path, the scraping piece 201 can scrape the adhered slag on the shielding piece 202, in particular, in order to better improve the scraping effect of the scraping piece 201, the scraping piece 201 in the embodiment includes a first scraper arranged on one side of the driving part 2031 and a second scraper arranged on one side of the driven part 2032.

[0057] Among them, the two side walls of the first scraper abut on the inner side walls of the shielding piece 202 on one side of the driving part 2031, and the two side walls of the second scraper abut on the inner side walls of the shielding piece 202 on one side of the driven part 2032, so that the scraping piece 201 includes the first scraper and the second scraper arranged on the driving side and the driven side respectively, which is convenient for scraping the adhered slag on the shielding piece 202, and the structure is simple and beneficial to design implementation.

[0058] In more detail, the first scraper and the second scraper in the embodiment are arranged in T-shaped plate structure, so that the first scraper and the second scraper are arranged in T-shaped plate structure, which is convenient for the installation of the first scraper and the second scraper on the dust collecting opening 101, and helps to improve the scraping effect of the first scraper and the second scraper, the structure is simple and beneficial to design implementation.

[0059] In addition, in combination with Figure 1 , Figure 2 and Figure 4As shown, the scraper assembly 2 in the embodiment further comprises a tensioning portion 204 arranged on one side of the driven portion 2032, the tensioning portion 204 comprises a mounting plate 2041 arranged on the dust removal box assembly 1, and an elastic member 2042 arranged on the mounting plate 2041, the mounting plate 2041 is provided with a sliding groove 2043, the rotating shaft is arranged in the sliding groove 2043, one end of the elastic member 2042 is connected to the mounting plate 2041, and the other end of the elastic member 2042 is connected to the rotating shaft, so as to constrain the position of the rotating shaft in the sliding groove 2043. Through the arrangement of the tensioning portion 204, the installation of the shielding member 202 on the driving mechanism 203 is facilitated, and the sliding stroke of the shielding member 202 is always in a tensioning state, which is simple in structure and beneficial to design and implementation.

[0060] Specifically, the elastic member 2042 in the embodiment may be a spring, for example. One end of the spring is connected to the mounting plate 2041, and the other end of the spring is connected to the rotating shaft. When the driving mechanism 203 operates, the spring is in a stretched state. When the shielding member 202 is replaced, the connection end of the spring and the rotating shaft is removed from the rotating shaft, and the rotating shaft is slid along the sliding groove 2043, so that the shielding member 202 is released from the tensioning state. Conversely, when the shielding member 202 is installed, the shielding member 202 is first sleeved on the driving mechanism 203, the rotating shaft is slid along the sliding groove 2043 to tension the shielding member 202, and the spring is stretched and connected to the rotating shaft.

[0061] The laser cutting dust removal mechanism can collect and store the molten slag generated by laser cutting, shield the inner side of the dust collecting port 101, prevent the molten slag from directly contacting the side wall of the dust collecting port 101 and adhering and accumulating on the dust collecting port 101, and clean the molten slag adhered to the shielding member 202 through the scraping member 201, so as to ensure the smooth collection of the molten slag by the dust collecting port 101, effectively avoid the accumulation of the molten slag on the dust collecting port 101, and prevent the sparks from reflecting and blackening the surface of the to-be-cut plate, thereby improving the cutting quality of the laser cutting mechanism.

[0062] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A laser cutting dust removal mechanism for dust removal operation when a plate is laser cut, characterized by, The dust removal mechanism comprises: A dust removal box assembly (1) is provided with a dust collection port (101), which corresponds to the preset cutting position of the plate to be cut, and can collect and store the slag generated by laser cutting; A scraper assembly (2) comprises a scraping part (201) provided at both ends of the dust collection port (101), a shielding part (202) slidingly provided inside the dust collection port (101) along a closed path, and a driving mechanism (203) driving the shielding part (202) to slide; When the plate to be cut is cut above the dust collection port (101), the shielding part (202) can block the slag from contacting the inner wall of the dust collection port (101), and when the driving mechanism (203) drives the shielding part (202) to slide along the closed path, the scraping part (201) can scrape the slag adhered to the shielding part (202).

2. The laser cutting dust removal mechanism according to claim 1, wherein: The dust removal box assembly (1) comprises a box body (102) having a containing cavity, and a negative pressure mechanism for creating negative pressure in the containing cavity; The dust collection port (101) is opened at the top of the box body (102), and negative pressure is created in the box body (102) by the negative pressure mechanism, so that the slag enters the box body (102) through the dust collection port (101).

3. The laser cutting dust removal mechanism according to claim 2, wherein: The box body (102) is provided below with a slag removal mechanism (103), and the bottom of the box body (102) is provided with a communication port facing the slag removal mechanism (103).

4. The laser cutting dust removal mechanism according to claim 3, wherein: The slag removal mechanism (103) comprises a slag box (1031), universal wheels (1032) provided below the slag box (1031), and a hand holding part (1033) provided on the slag box (1031); The communication port communicates with the slag box (1031), so that the slag enters the slag box (1031).

5. The dust removal mechanism according to claim 4, wherein: The box body (102) is provided with a guide plate (1021) inclined downward from the inner side wall of the box body (102).

6. The laser cutting dust removal mechanism according to claim 2, wherein: The negative pressure mechanism comprises a fan provided on the box body (102), which can exhaust the gas in the box body (102) to the outside to create negative pressure in the box body (102).

7. The laser cutting dust removal mechanism according to claim 1, wherein: The shielding part (202) is made of a ring structure of Teflon material.

8. The laser cutting dust removal mechanism according to any one of claims 1-7, wherein: The driving mechanism (203) comprises a driving part (2031) and a driven part (2032) respectively arranged at two ends of the dust collecting port (101), and the shielding part (202) is an annular structure sleeved on the driving part (2031) and the driven part (2032); The driving part (2031) comprises a driving motor and a driving wheel arranged on a power output end of the driving motor; The driven part (2032) comprises a rotating shaft, a bearing sleeved on the rotating shaft, and a driven wheel arranged on the bearing; When the driving motor drives the driving wheel to rotate, the shielding part (202) can be driven to rotate the driven wheel, so that the shielding part (202) is arranged in the dust collecting port (101) along the closed path.

9. The laser cutting dust removal mechanism according to claim 8, wherein: The scraping part (201) comprises a first scraper arranged on one side of the driving part (2031) and a second scraper arranged on one side of the driven part (2032); The two side walls of the first scraper are respectively abutted on the inner side walls of the shielding part (202) located on one side of the driving part (2031); The two side walls of the second scraper are respectively abutted on the inner side walls of the shielding part (202) located on one side of the driven part (2032).

10. The laser cutting dust removal mechanism according to claim 8, wherein: The scraper assembly (2) further comprises a tensioning part (204) arranged on one side of the driven part (2032), the tensioning part (204) comprises a mounting plate (2041) arranged on the dust removal box assembly (1), and an elastic member (2042) arranged on the mounting plate (2041); The mounting plate (2041) is provided with a sliding groove (2043), the rotating shaft is slidingly arranged in the sliding groove (2043), one end of the elastic member (2042) is connected to the mounting plate (2041), and the other end of the elastic member (2042) is connected to the rotating shaft, so as to constrain the position of the rotating shaft in the sliding groove (2043).

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