Vacuum cleaner with automatic dust removal function

Abstract

A dust collection bin with automatic dust removal function is characterized by: at least two or more sets of filters, each or each set of filters is equipped with a dust collection and dust removal reversing valve, and a driving device is provided for the combined dampers on the dust collection and dust removal reversing valves. Under the action of the driving device, each combined damper alternately switches between a first working position and a second working position. Specifically, in the first working position, the combined damper opens the dust collection outlet and closes the dust removal inlet; in the second working position, the combined damper closes the dust collection outlet and opens the dust removal inlet. This solution solves the problem of simultaneously performing dust collection and dust removal, and is particularly suitable for situations in industrial, hotel, restaurant, and public places where the dust collection volume is large and continuous long-term operation is required.

Description

Technical Field

[0001] The invention relates to the field of vacuum cleaners, and in particular to a vacuum bucket with an automatic dust cleaning function, which can automatically clean each filter in turn while vacuuming continuously, so as to keep the filters in the vacuum bucket always in a good working state. Background Art

[0002] Industrial vacuum cleaners (including medium and large vacuum cleaners used in hotels, restaurants and public places) are commonly used supporting or cleaning equipment, mainly used for collecting waste in industrial production processes, filtering and purifying air, and cleaning the environment. Compared with household vacuum cleaners, industrial vacuum cleaners have the characteristics of being able to be used continuously for 24 hours, having strong suction power, large dust storage capacity, long service life, and being able to withstand high temperatures.

[0003] Industrial vacuum cleaners generally have dust cleaning problems due to their long continuous working time and large dust collection volume. In order not to reduce work efficiency, there is an automatic dust cleaning dust collection bucket on the market that uses high-pressure gas to impact the dust accumulation surface of the filter. The disadvantage of this dust collection bucket is that it requires an external air source when in use, so its use occasions are greatly limited.

[0004] On July 6, 2016, Chinese patent CN205360858U disclosed a utility model patent named "Self-dust-removing dust bucket". The patent has a motor vertically arranged inside the filter element, and a filter lever extending toward the inner wall of the filter element is arranged below the motor. A lever head is arranged at one end of the filter lever, and the other end is connected to the output shaft of the motor through a lever shaft. When the filter element needs to be cleaned and dusted, the filter lever is driven to rotate by the motor, and the lever head on the filter lever moves the filter on the filter element, so that the dust attached to the filter is cleaned off. Although this technical solution can realize automatic cleaning of the filter element in the dust bucket without disassembly, since there is only one filter element in the dust bucket, dust collection cannot be taken into account during cleaning, and automatic cleaning cannot be achieved without stopping dust collection.

[0005] In view of this, how to design a dust collecting device that can automatically clean dust without stopping the dust collection is a subject to be studied by the present invention. Summary of the invention

[0006] The invention provides a dust collection bucket with an automatic dust cleaning function, which aims to solve the problem that dust collection and dust cleaning cannot be taken into account at the same time in the existing dust collection device.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a dust collector with automatic dust cleaning function, comprising a shell, a dust suction port and an air outlet are provided on the shell, a first negative pressure chamber, a second negative pressure chamber and a filter are provided in the shell, the dust suction port is connected to the first negative pressure chamber, the air outlet is connected to the second negative pressure chamber, and the first negative pressure chamber is connected to the second negative pressure chamber through the filter.

[0008] The innovation lies in that the filter is composed of at least two or two groups, each or each group of filters is arranged between the first negative pressure chamber and the second negative pressure chamber, and each or each group of filters forms a parallel filtering channel on the filtering path of the first negative pressure chamber and the second negative pressure chamber.

[0009] A dust suction and cleaning reversing valve is arranged for each filter or each group of filters, and the dust suction and cleaning reversing valve has a reversing valve seat, and a reversing cavity is arranged on the reversing valve seat, and the reversing cavity is located on the second negative pressure chamber side of the first negative pressure chamber and the second negative pressure chamber with the filter as the center; the reversing cavity is a space, and a dust suction outlet, a cleaning air inlet and a dust suction and cleaning common port are respectively arranged on the side walls of the space, wherein the dust suction and cleaning common port is connected with the filter, the dust suction outlet is connected with the second negative pressure chamber, and the cleaning air inlet is connected with the outside of the shell.

[0010] A first damper is set for the dust suction outlet on each reversing valve seat, and a second damper is set for the dust cleaning air inlet on each reversing valve seat. The first damper is fixedly connected to the second damper by a connecting bracket to form an integral combined damper. The combined damper is rotatably connected relative to the reversing valve seat, and has two working positions in the rotation direction of the combined damper. In the first working position, the combined damper opens the dust suction outlet and closes the dust cleaning air inlet. In the second working position, the combined damper closes the dust suction outlet and opens the dust cleaning air inlet.

[0011] A driving device is provided for the combined air doors on the dust suction and cleaning reversing valve, and under the action of the driving device, each combined air door switches alternately between the first working position and the second working position.

[0012] The relevant contents in the above technical solution are explained as follows:

[0013] 1. In the above solution, the shell refers to the outer shell of the dust collector bucket of the present invention.

[0014] 2. In the above scheme, the suction port refers to the interface for dust collection. The air outlet refers to the air suction port or the exhaust port, wherein the suction port means that the dust bucket itself does not have a dust suction motor and a dust suction fan, and the dust suction fan is placed outside the dust bucket and connected to the suction port through a pipe. At this time, the dust suction port is under negative pressure in the working state; and the exhaust port means that the dust bucket has a dust suction motor and a dust suction fan, and the dust suction motor and the dust suction fan are arranged on the dust bucket. At this time, the dust suction port is under negative pressure in the working state.

[0015] 3. In the above scheme, in order to open and close the dust outlet and the dust cleaning inlet at the same time by rotation, the sealing surface of the dust outlet and the sealing surface of the dust cleaning inlet are placed in different directions of rotation around the axis on the same plane to facilitate control of both.

[0016] 4. In the above scheme, the first air shield door is located on the side of the second negative pressure chamber with the center of the dust suction outlet as the reference, and the second air shield door is located on the external connection side with the center of the dust cleaning air inlet as the reference. In the working state, the negative pressure formed by the second negative pressure chamber forces the first air shield door to open the dust suction outlet, and at the same time forces the second air shield door to close the dust cleaning air inlet, so that the combined air shield is in the first working position. In the dust cleaning state, the driving device forces the combined air shield door to switch from the first working position to the second working position.

[0017] 5. In the above scheme, the driving device is composed of a motor, a reducer and a paddle. The output shaft of the motor is connected to the input shaft of the reducer by transmission. The output shaft of the reducer is fixedly connected to the paddle. The paddle is provided with a toggle end. A touch block is provided on the combined damper corresponding to the toggle end. The touch block is provided with a touch surface. The touch blocks on all the combined dampers are arranged in a circumferential direction around the paddle with the paddle rotation axis as the center. In the working state, the motor drives the paddle to rotate through the reducer. On the rotation path, the toggle end of the paddle touches the touch blocks on all the combined dampers in turn, so that each or each group of filters is cleaned in turn while keeping the dust bucket in a dust collection state. The driving device can also be composed of a solenoid valve, the driving end of the solenoid valve serves as the touch end, and each solenoid valve corresponds to a combined damper.

[0018] The design principle of the present invention is: in order to solve the problem that the existing dust collection device cannot take into account both dust collection and dust cleaning at the same time, the present solution sets at least two or two groups of filters, and sets a dust collection and dust cleaning reversing valve for each or each group of filters, and then sets a driving device for the combined damper on the dust collection and dust cleaning reversing valve, and each combined damper switches alternately between the first working position and the second working position under the action of the driving device. Among them, in the first working position state, the combined damper opens the dust collection outlet and closes the dust cleaning air inlet at the same time, and in the second working position state, the combined damper closes the dust collection outlet and opens the dust cleaning air inlet at the same time.

[0019] Compared with the prior art, this solution has the following advantages and effects:

[0020] 1. The present invention can work continuously, that is, it can vacuum and clean at the same time. The filter will not be blocked during 24-hour operation. It can take care of both vacuuming and cleaning at the same time. It is particularly suitable for industries, hotels, restaurants and public places where the amount of vacuuming is large and continuous long-term operation is required.

[0021] 2. The dust suction and dust cleaning reversing valve of the present invention has a simple design structure and reliable operation. In particular, it adopts a rotation method to control the switching of the combined air door to open and close, and its design concept is very ingenious.

[0022] 3. The driving device of the present invention is composed of a motor, a reducer and a paddle. In order to reliably and effectively control the switching of the combined damper to open and close, an elastic arm structure is specially designed on the combined damper, and a touch surface composed of a section of inclined surface and a section of arc surface is also designed on the elastic arm. These designs play a positive role in reliably and effectively controlling the switching of the combined damper, and also solve the problem that the dust outlet cannot be closed or is blocked due to industrial manufacturing errors and wear, so it has outstanding substantial characteristics.

[0023] 4. The present invention does not require an external gas source when used, and is applicable to a wider range of places and occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attached Figure 1 is a three-dimensional diagram of the dust collection bucket of this embodiment;

[0025] Attached Figure 2 This is an exploded view of the dust bucket of this embodiment;

[0026] Attached Figure 3 This is a three-dimensional diagram of the filter, dust collection and cleaning reversing valve and fixing plate in the dust collection bucket of this embodiment;

[0027] Attached Figure 4 A top view of the dust collection and cleaning reversing valve and the fixing plate in the dust collection bucket of this embodiment;

[0028] Attached Figure 5 A three-dimensional diagram of the motor and paddle of the vacuum cleaner bucket of this embodiment;

[0029] Attached Figure 6 This is a three-dimensional diagram of the reversing valve seat of the dust collection bucket of this embodiment;

[0030] Attached Figure 7 This is a three-dimensional diagram of the combined air door of the dust collection bucket of this embodiment;

[0031] Attached Figure 8 is a top view of the dust collection bucket of this embodiment;

[0032] Attached Fig. 9 for Figure 8 Sectional view along AA direction;

[0033] Attached Fig.10 is a top view of the dust collection bucket of this embodiment;

[0034] Attached Fig.11 for Fig.10 Middle BB section view.

[0035] In the above figures: 1. Dust suction port; 2. Air outlet; 3. Barrel body; 4. Filter; 5. Fixed plate; 6. Sealing ring; 7. Upper cover; 8. Top cover; 9. Reversing valve seat; 10. Motor; 11. Paddle; 12. First air shield; 13. Connecting bracket; 14. Second air shield; 15. Pin; 16. Elastic arm; 17. Spring; 18. Inclined surface; 19. Arc surface; 20. Dust suction and ash cleaning reversing valve; 21. Isolation chamber; 22. Ash cleaning air inlet; 23. Dust suction and ash cleaning common port; 24. Dust suction air outlet; 25. Reversing chamber; 26. First negative pressure chamber; 27. Second negative pressure chamber; 28. Normal pressure chamber. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0037] Embodiment: A dust collecting bucket with automatic dust cleaning function

[0038] See attached Figure 1-11 The dust collection bucket comprises a shell, on which a dust collection port 1 and an air outlet 2 are provided (see Figure 1 and Figure 2 ), the shell is provided with a first negative pressure chamber 26, a second negative pressure chamber 27 and a filter 4 (see Fig. 9 ), the suction port 1 is connected to the first negative pressure chamber 26 (see Fig.11 ), the air outlet 2 is connected to the second negative pressure chamber 27 (see Fig.11 ), the first negative pressure chamber 26 is connected to the second negative pressure chamber 27 through the filter 4 (see Fig. 9 ).

[0039] The shell is composed of a barrel 3, an upper cover 7, a top cover 8 and a fixing plate 5 (see Figure 1 ), the barrel body 3 is a container with an upper opening, the upper cover 7 is a cover with a lower opening, the upper cover 7 covers the upper end of the barrel body 3, and the fixing plate 5 is arranged between the upper cover 7 and the barrel body 3 (see Figure 1 and Figure 2 ), a sealing ring 6 is provided on the outer periphery of the fixing plate 5 for sealing (see Figure 2 The fixing plate 5 is used to fix the filter 4, the dust suction and cleaning reversing valve 20 and the driving device (see Figure 2), on the other hand, the internal space formed by the upper cover 7 and the barrel body 3 is divided into a first negative pressure chamber 26 located at the bottom and a second negative pressure chamber 27 located at the top (see Fig. 9 The top cover 8 is placed on the top of the upper cover 7, and a normal pressure chamber 28 is provided in the shell (see Fig. 9 ), the normal pressure chamber 28 is formed by the space between the top cover 8 and the upper cover 7. The normal pressure chamber 28 is connected to the dust removal air inlet 22 on the reversing valve seat 9 on one hand, and is connected to the outside of the housing on the other hand. The reversing valve seat 9 is provided with an isolation chamber 21 (see Figure 6 ), the isolation chamber 21 is connected to the dust cleaning air inlet 22 on one hand, and is connected to the normal pressure chamber 28 on the other hand, and finally the dust cleaning air inlet 22 is connected to the normal pressure chamber 28 through the isolation chamber 21 (see Fig. 9 ).

[0040] The filter 4 consists of three components (see Figure 3 ), each filter 4 is arranged between the first negative pressure chamber 26 and the second negative pressure chamber 27, and each filter 4 forms a parallel filtering channel on the filtering path of the first negative pressure chamber 26 and the second negative pressure chamber 27.

[0041] A dust suction and cleaning reversing valve 20 (see Figure 3 ), the dust suction and cleaning reversing valve 20 has a reversing valve seat 9 (see Figure 6 ), a reversing chamber 25 is provided on the reversing valve seat 9, and the reversing chamber 25 is located on the side of the second negative pressure chamber 27 of the first negative pressure chamber 26 and the second negative pressure chamber 27 with the filter 4 as the center. The reversing chamber 25 is a space, and a dust suction outlet 24, a dust cleaning air inlet 22 and a dust suction and dust cleaning common port 23 are respectively provided on the side walls of the space (see Figure 6 ), wherein the dust collection and cleaning common port 23 is connected to the filter 4 (see Fig. 9 ), the dust suction outlet 24 is connected to the second negative pressure chamber 27 (see Fig.11 ), the dust cleaning air inlet 22 is connected to the outside of the housing (see Fig. 9 ).

[0042] A first air shield door 12 is provided for each dust suction air outlet 24 on the reversing valve seat 9 (see Figure 7 ), a second air shield door 14 is provided for the dust cleaning air inlet 22 on each reversing valve seat 9 (see Figure 7 ), the first air shield door 12 and the second air shield door 14 are fixedly connected by a connecting bracket 13 to form an integral combined air shield (see Figure 7 ), the combined damper is rotatably connected to the reversing valve seat 9 via a pin 15 (see Figure 7), the combined damper has two working positions in the rotation direction, wherein in the first working position state, the combined damper opens the dust suction air outlet 24 and closes the dust cleaning air inlet 22, and in the second working position state, the combined damper closes the dust suction air outlet 24 and opens the dust cleaning air inlet 22.

[0043] The sealing surface of the dust suction air outlet 24 and the sealing surface of the dust cleaning air inlet 22 are located in different directions of rotation around the axis on the same plane (see Figure 6 The first damper door 12 is located at one side of the second negative pressure chamber 27 with the center of the dust outlet 24 as a reference, and the second damper door 14 is located at one side of the normal pressure chamber 28 with the center of the dust cleaning air inlet 22 as a reference. In the working state, the negative pressure formed by the second negative pressure chamber 27 forces the first damper door 12 to open the dust outlet 24, and at the same time forces the second damper door 14 to close the dust cleaning air inlet 22, so that the combined damper is in the first working position. In the dust cleaning state, the driving device forces the combined damper to switch from the first working position to the second working position.

[0044] When the combined air door is in the first working position, Fig.10 and Fig.11 , pay special attention Fig.11 The upper right part is represented by a curve indicating the airflow path, at which time the corresponding filter 4 is in a dust collecting working state.

[0045] When the combined damper is in the second working position, Figure 8 and Fig. 9 , pay special attention Fig. 9 The upper left part uses a curve to represent the airflow path, and the corresponding filter 4 is in a dust cleaning working state at this time.

[0046] A driving device is provided for the combined dampers on the dust suction and cleaning reversing valve 20, and each combined damper is switched alternately between the first working position and the second working position under the action of the driving device. In this embodiment, the driving device is composed of a motor 10, a reducer and a paddle 11 (see Figure 5 ), the output shaft of the motor 10 is drivingly connected to the input shaft of the reducer, the output shaft of the reducer is fixedly connected to the paddle 11, and the paddle 11 is provided with a paddle end (see Figure 5 ), a touch block is provided on the combined damper corresponding to the toggle end, and a touch surface is provided on the touch block. The touch blocks on all the combined dampers are arranged at intervals in the circumferential direction around the paddle 11 with the rotation axis of the paddle 11 as the center. In the working state, the motor 10 drives the paddle 11 to rotate through the reducer (see Figure 4 ), on the rotating path, the toggling end of the paddle 11 touches the touch blocks on all the combined air doors in turn, so as to clean each or each group of filters 4 in turn while keeping the dust collection bucket always in the dust collection state.

[0047] In order to reliably and effectively control the switching of the combined damper to open and close, the trigger block is an elastic arm 16 (see Figure 7 ), the elastic arm 16 is rotatably connected to the combined damper, and a spring 17 is provided between the elastic arm 16 and the combined damper (see Figure 7 The touch surface is composed of a slope 18 and a circular arc surface 19 (see Figure 7 ). The purpose of the elastic arm 16 and the spring 17 is to solve the problem that the dust outlet 24 cannot be closed or is blocked due to industrial manufacturing errors and wear. The inclined surface 18 is designed to close the door quickly. Slow closing speed will cause the dust bucket to be in a state of decompression or air leakage, which is not conducive to the normal operation of the dust bucket and should be minimized. The arc surface 19 is designed to keep the door closed. A gap appears after the arc surface 19 ends. This gap will cause the dust outlet 24 to be quickly opened, switching from the dust cleaning state to the dust collection state.

[0048] The following is an explanation of other implementations and structural changes of the present invention:

[0049] 1. In the above embodiment, the filters 4 are composed of three. However, the present invention is not limited thereto, and the number of filters 4 can be two, four, five, or even more. This is understandable to those skilled in the art, and the essential condition is that at least two filters 4 are composed. In addition, the filters 4 can be designed in the form of groups, each group is equivalent to an independent unit, and each group is composed of at least two filters. This is understandable to those skilled in the art.

[0050] 2. In the above embodiments, the driving device is composed of a motor 10, a reducer and a paddle 11 (see Figure 5 ). However, the present invention is not limited thereto, and the driving device may be in other structural forms, for example, the driving device is composed of a solenoid valve, the driving end of the solenoid valve serves as the trigger end, and each solenoid valve corresponds to a combined damper.

[0051] 3. In the above embodiments, the housing is composed of a barrel 3, an upper cover 7, a top cover 8 and a fixing plate 5 (see Figure 1 ). However, the present invention is not limited thereto, and may have other structural forms, and the shell essentially refers to the outer shell of the dust collection bucket.

[0052] 4. In the above embodiments, the dust collection bucket does not include a dust collection motor and a dust collection fan. However, the present invention is not limited thereto, and the dust collection motor and the dust collection fan may also be designed on the dust collection bucket. This is understandable to those skilled in the art.

[0053] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A dust collection bucket with an automatic dust cleaning function, comprising a shell, the shell being provided with a dust collection port (1) and an air outlet (2), the shell being provided with a first negative pressure chamber (26), a second negative pressure chamber (27) and a filter (4), the dust collection port (1) being in communication with the first negative pressure chamber (26), the air outlet (2) being in communication with the second negative pressure chamber (27), and the first negative pressure chamber (26) being in communication with the second negative pressure chamber (27) via the filter (4); Features: The filter (4) is composed of at least two or two groups, each filter (4) is arranged between the first negative pressure chamber (26) and the second negative pressure chamber (27), and each filter (4) forms a parallel filtering channel on the filtering path between the first negative pressure chamber (26) and the second negative pressure chamber (27); A dust collection and ash cleaning reversing valve (20) is provided for each filter or each group of filters (4), the dust collection and ash cleaning reversing valve (20) having a reversing valve seat (9), a reversing chamber (25) being provided on the reversing valve seat (9), the reversing chamber (25) being located on the side of the second negative pressure chamber (27) of the first negative pressure chamber (26) and the second negative pressure chamber (27) with the filter (4) as the center; the reversing chamber (25) is a space, the side walls of which are respectively provided with a dust collection outlet (24), a ash cleaning air inlet (22) and a dust collection and ash cleaning common port (23), wherein the dust collection and ash cleaning common port (23) is connected to the filter (4), the dust collection outlet (24) is connected to the second negative pressure chamber (27), and the ash cleaning air inlet (22) is connected to the outside of the shell; A first damper (12) is provided for each dust suction air outlet (24) on the reversing valve seat (9), and a second damper (14) is provided for each dust cleaning air inlet (22) on the reversing valve seat (9); the first damper (12) and the second damper (14) are fixedly connected via a connecting bracket (13) to form an integral combined damper; the combined damper is rotatably connected relative to the reversing valve seat (9) and has two working positions in the rotation direction of the combined damper; in the first working position, the combined damper opens the dust suction air outlet (24) and closes the dust cleaning air inlet (22); and in the second working position, the combined damper closes the dust suction air outlet (24) and opens the dust cleaning air inlet (22); The sealing surface of the dust suction air outlet (24) and the sealing surface of the dust cleaning air inlet (22) are located in different directions of rotation around the axis on the same plane; A normal pressure chamber (28) is provided in the shell, the normal pressure chamber (28) being in communication with the dust cleaning air inlet (22) on the reversing valve seat (9) on one hand, and being in communication with the outside of the shell on the other hand; an isolation chamber (21) is provided on the reversing valve seat (9), the isolation chamber (21) being in communication with the dust cleaning air inlet (22) on one hand, and being in communication with the normal pressure chamber (28) on the other hand; A driving device is provided for the combined air doors on the dust suction and dust cleaning reversing valve (20), and under the action of the driving device, each combined air door switches alternately between a first working position and a second working position; The first damper door (12) is located on one side of the second negative pressure chamber (27) with the center of the dust suction outlet (24) as a reference, and the second damper door (14) is located on the external connection side with the center of the dust cleaning air inlet (22) as a reference. In the working state, the negative pressure formed by the second negative pressure chamber (27) forces the first damper door (12) to open the dust suction outlet (24) and forces the second damper door (14) to close the dust cleaning air inlet (22), so that the combined damper is in the first working position. In the dust cleaning state, the driving device forces the combined damper to switch from the first working position to the second working position. The driving device is composed of a motor (10), a reducer and a paddle (11); the output shaft of the motor (10) is drivingly connected to the input shaft of the reducer; the output shaft of the reducer is fixedly connected to the paddle (11); a paddle (11) is provided with a toggle end; a touch block is provided on the combined air door corresponding to the toggle end; and a touch surface is provided on the touch block; the touch blocks on all the combined air doors are arranged at intervals in a circumferential direction around the paddle (11) with the rotation axis of the paddle (11) as the center; in a working state, the motor (10) drives the paddle (11) to rotate through the reducer; and on the rotation path, the toggle end of the paddle (11) touches the touch blocks on all the combined air doors in turn, thereby keeping the dust collection bucket always in a dust collection state and cleaning each filter or each group of filters (4) in turn.

2. The dust bucket according to claim 1, Features: The shell comprises a barrel body (3), an upper cover (7) and a top cover (8); the barrel body (3) is a container with an upper opening, the upper cover (7) is a cover body with a lower opening, the upper cover (7) covers the upper end of the barrel body (3), a fixing plate (5) is provided between the upper cover (7) and the barrel body (3), the fixing plate (5) being used to fix or install a filter (4), a dust suction and ash cleaning reversing valve (20) and a driving device on the one hand, and to separate the internal space formed by the upper cover (7) and the barrel body (3) into a first negative pressure chamber (26) located at the lower part and a second negative pressure chamber (27) located at the upper part on the other hand; the top cover (8) covers the top of the upper cover (7), the normal pressure chamber (28) is formed by the space between the top cover (8) and the upper cover (7), and the ash cleaning air inlet (22) is connected to the normal pressure chamber (28) through the isolation cavity (21).

3. The dust bucket according to claim 1, Features: The trigger block is an elastic arm (16), the elastic arm (16) is rotationally connected or movably connected relative to the combined damper, and a spring (17) is provided between the elastic arm (16) and the combined damper.

4. The dust bucket according to claim 1, Features: The actuating surface is composed of a section of inclined surface (18) and a section of arc surface (19) connected together.

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