A dust extractor brush

Abstract

The present application relates to the technical field of dust collector, and discloses a dust collector floor brush, which comprises a floor brush upper cover, an air outlet pipe is arranged on the floor brush upper cover; a base is detachably installed at the bottom of the floor brush upper cover; further comprising: a dust suction cover is sealingly arranged on the base, the air outlet pipe is communicated with the inner cavity of the dust suction cover, and an air inlet is formed in the dust suction cover; a plugging mechanism is arranged on the base and has a plugging station and a unplugging station; when the dust collector floor brush is used to suck dust on the ground, the plugging mechanism is located at the unplugging station to make the air inlet open; when the dust collector floor brush is lifted, the plugging mechanism is located at the plugging station to plug the air inlet. The dust collector floor brush can plug the air inlet when the dusting operation is completed and the dust collector floor brush is lifted, so that even if the dust collector floor brush shakes or vibrates when being lifted, dust adhered to the inner wall of the air duct will not flow out of the air inlet, and the clean ground will not be covered with dust again.

Description

Technical Field

[0001] This invention relates to the field of vacuum cleaner technology, and more specifically to a vacuum cleaner floor brush. Background Technology

[0002] Vacuum cleaners are common cleaning tools used in daily life, widely used to remove dust from floors. They work by using an electric motor to drive blades to rotate at high speed, creating negative air pressure within a sealed casing to suck up dust and debris. The floor brush is a crucial component of the vacuum cleaner, used to contact the floor. Its inner cavity forms a negative pressure chamber, and by placing the suction nozzle at the bottom or front of the brush and connecting it to this chamber, it effectively removes dust.

[0003] For example, Chinese invention patents with authorization announcement numbers 201611047353.2 and CN106618378B, entitled "A Floor Brush for a Vacuum Cleaner," disclose a floor brush cover, a base, a slider, a suction mask cover, and a floor brush air outlet device. The slider has a suction port in the middle, and two arc-shaped air ducts connected to the suction port are symmetrically arranged on both sides of the suction port on the lower surface of the slider. Each arc-shaped air duct includes a connection port connected to the suction port and an air inlet located at the front end of the slider. When the vacuum cleaner is working, air and dust from the ground enter through the two air inlets at the front end of the slider, pass through the arc-shaped air ducts, and enter the suction port. The arc-shaped air duct structure facilitates airflow entry, and at the same time, the arc-shaped air ducts can rectify the two airflows entering from the air inlets, effectively reducing the noise generated when the airflow enters the floor brush.

[0004] The vacuum cleaner floor brush provided by the aforementioned invention patent, although able to reduce the noise generated when the airflow enters the floor brush by rectifying the two airflows entering from the air inlet using the arc-shaped air duct design, has the following drawbacks: In actual use, when the vacuum cleaner is turned off at the end, the suction force suddenly disappears, causing some dust to always stick to the inner wall of the air duct and not be sucked into the dust collection box. In addition, the arc-shaped air duct design in the aforementioned patent makes it easier for more dust to stick to the inner wall of the curved part of the air duct. Moreover, since both air inlets are open, when the floor brush is picked up from the ground after vacuuming, the vibration or shaking of the floor brush will cause the dust adhering to the inner wall of the floor brush to easily flow out from the suction port, causing the cleaned floor to fall dust again. Summary of the Invention

[0005] The purpose of this invention is to provide a vacuum cleaner floor brush to overcome the aforementioned shortcomings of the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a vacuum cleaner floor brush, comprising...

[0007] A floor brush cover is installed on top of which an air outlet duct is installed;

[0008] A base, detachably mounted on the bottom of the floor brush cover; also includes:

[0009] A dust collection hood is sealed on the base, the air outlet pipe is connected to the inner cavity of the dust collection hood, and the dust collection hood has an air inlet.

[0010] A sealing mechanism is mounted on the base and has a sealing station and a desealing station;

[0011] When the vacuum cleaner floor brush is on the ground for vacuuming, the sealing mechanism is in the unsealing position to allow the air inlet to be open; when the vacuum cleaner floor brush is picked up, the sealing mechanism is in the sealing position to block the air inlet.

[0012] The vacuum cleaner floor brush described above has a first roller rotatably mounted on its upper cover and two second rollers symmetrically arranged rotatably mounted on its base.

[0013] In the aforementioned vacuum cleaner floor brush, each of the two second rollers is elastically slidably disposed in the vertical direction via an elastic mechanism, and the second rollers are rotatably connected to the elastic mechanism.

[0014] The aforementioned vacuum cleaner floor brush includes two symmetrically arranged fixed plates. Each of the two fixed plates has a guide groove on its opposite side. A slider is slidably disposed in each of the two guide grooves. A second roller is rotatably disposed between the two sliders. A first compression spring is connected between the top surface of the slider and the top surface of the guide groove, and a second compression spring is connected between the bottom surface of the slider and the bottom surface of the guide groove.

[0015] In the aforementioned vacuum cleaner floor brush, the sealing mechanism is connected to the second roller via a transmission. When the vacuum cleaner floor brush is on the ground, the weight of the base compresses each of the first compression springs to drive the second roller to move upward. The upward movement of the second roller causes the sealing mechanism to be positioned at the unsealing station.

[0016] In the aforementioned vacuum cleaner floor brush, the sealing mechanism is elastically rotatably connected to the base. When the vacuum cleaner floor brush is picked up, under the action of the elastic rotation force, one end of the sealing mechanism rotates toward the air inlet to block the air inlet.

[0017] The aforementioned vacuum cleaner floor brush includes a sealing mechanism comprising two swing rods that abut against the tops of two second rollers respectively. One end of each swing rod is elastically rotatably connected to the base, and the other end of each swing rod is fixedly fitted with a sealing plate that slides against the inner wall of the base. The elastic rotational force of the swing rod is directed towards the air inlet, which is located below the sealing plate, so that the air inlet is blocked when the swing rod drives the sealing plate to rotate downward elastically.

[0018] The aforementioned vacuum cleaner floor brush has a base with clearance holes on the side away from the air inlet, corresponding to the two swing rods. The swing rods pass through the corresponding clearance holes, and each clearance hole is sealed with an elastic pad. The swing rods pass through the elastic pads and are sealed with the penetration point of the elastic pads.

[0019] In the aforementioned vacuum cleaner floor brush, the side plate on which the dust cover slides and fits into the sealing plate is an arc-shaped plate, the air inlet is located at the bottom of the arc-shaped plate, the sealing plate is also arc-shaped, and the center of the arc of the arc-shaped plate, the center of the arc of the sealing plate, and the rotation center of the swing rod coincide.

[0020] The aforementioned vacuum cleaner floor brush also includes two limiting mechanisms corresponding to the two swing arms. The limiting mechanisms abut against the top of the swing arms to limit the maximum angle of upward rotation of the sealing plate.

[0021] Beneficial effects: In the above technical solution, the vacuum cleaner floor brush provided by the present invention, by setting a sealing mechanism on the base, can keep the air inlet open when the vacuum cleaner is working without hindering the vacuuming operation. At the same time, it can block the air inlet when the vacuum cleaner floor brush is picked up after vacuuming, so that even if the vacuum cleaner floor brush shakes or vibrates when picked up, the dust adhering to the inner wall of the ventilation duct will not flow out from the air inlet, thus preventing the cleaned floor from being covered with dust again. This can effectively solve the shortcomings of the prior art. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0023] Figure 1 This is a front view structural diagram of a vacuum cleaner floor brush provided in an embodiment of the present invention;

[0024] Figure 2 Provided for embodiments of the present invention Figure 1 A schematic diagram of the structure after removing the top cover of the floor brush and the first roller;

[0025] Figure 3 Provided for embodiments of the present invention Figure 2 A three-dimensional structural diagram;

[0026] Figure 4 Provided for embodiments of the present invention Figure 3 A magnified structural diagram of part A in the diagram;

[0027] Figure 5 Provided for embodiments of the present invention Figure 2 Sectional view in;

[0028] Figure 6 Provided for embodiments of the present invention Figure 5 A three-dimensional structural diagram;

[0029] Figure 7 A schematic diagram of the structure of the elastic mechanism provided in an embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the structure of the dust hood provided in an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Floor brush cover; 101. Air outlet pipe; 2. First roller; 3. Dust hood; 301. Opening; 302. Curved plate; 303. Air inlet; 304. Clearance hole; 4. Second roller; 5. Base; 501. Support plate; 502. Insertion port; 6. Swing rod; 7. Elastic pad; 8. Rotating shaft; 9. Elastic mechanism; 901. Fixing plate; 902. First compression spring; 903. Slider; 904. Second compression spring; 10. Threaded rod; 11. Top sleeve; 12. Limiting frame; 1201. Frame-shaped opening; 13. Threaded column; 14. Sealing plate. Detailed Implementation

[0033] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0034] like Figure 1-8 As shown, an embodiment of the present invention provides a vacuum cleaner floor brush, including...

[0035] A floor brush cover 1 is provided with an air outlet duct 101;

[0036] A base 5 is detachably mounted on the bottom of the floor brush cover 1; it also includes:

[0037] A dust cover 3 is sealed on the base 5, and the air outlet pipe 101 is connected to the inner cavity of the dust cover 3. An air inlet 303 is provided on the dust cover 3.

[0038] A sealing mechanism is installed on the base 5, which has a sealing station and an unsealing station;

[0039] When the vacuum cleaner floor brush is on the ground for vacuuming, the sealing mechanism is in the unsealing position to allow the air inlet 303 to be open; when the vacuum cleaner floor brush is picked up, the sealing mechanism is in the sealing position to seal the air inlet 303.

[0040] The vacuum cleaner floor brush provided in this embodiment is used to connect to the vacuum cleaner's suction pipe. When the motor drives the blades to rotate at high speed, it creates negative pressure in the inner cavity, thereby adsorbing dust from the floor. The directional terms such as "upper" and "lower" used in this embodiment are relative to the accompanying drawings. Specifically, the floor brush cover 1 and the base 5 are connected by screws or snap-fit. When connected by screws, multiple threaded posts 13 are fixedly installed on the base 5. The floor brush cover 1 has holes (not shown in the figure) corresponding to each of the multiple threaded posts 13. The screw passes through the holes and is screwed onto the threaded posts 13, thus connecting the floor brush cover 1 and the base 5. The dust collection hood 3 is sealed to the floor brush cover 1; this is prior art and will not be described in detail. The dust collection hood 3 is fixedly and sealed to the base 5, and the inner cavity of the dust collection hood 3 is connected to the air outlet pipe through the opening 301. The sealing connection 101 allows the inner cavity of the dust hood 3 and the inner cavity of the exhaust pipe 101 to form a sealed ventilation channel. The opening 301 is located at the top of the dust hood 3. The exhaust pipe 101 is sealed to the exhaust port of the vacuum cleaner. When the motor in the vacuum cleaner is running, it drives the blades to rotate at high speed, thereby creating a negative pressure in the ventilation channel formed by the inner cavity of the dust hood 3 and the inner cavity of the exhaust pipe 101. The dust hood 3 has an air inlet 303. Under the action of negative pressure, the air inlet 303 draws dust from the ground into the ventilation channel and collects it in the dust collection box. The air inlet 303 is arranged in a straight line along the width direction of the dust hood 3 (referring to the left and right direction when working). The air inlet 303 is located at the bottom or front of the dust hood 3 (referring to the position in front of the person when working), which is sufficient to generate suction force for the dust on the ground. The sealing mechanism is used to seal the air inlet 303 in a timely manner. When vacuuming is performed, the sealing mechanism is in the unsealing position. At this time, the air inlet 303 is not sealed, and dust can enter the ventilation duct through the air inlet 303 under the action of negative pressure. When the vacuuming operation is finished and the vacuum cleaner brush is picked up, the sealing mechanism automatically adjusts to the sealing position to seal the air inlet 303. At this time, the dust in the ventilation duct cannot flow out from the air inlet 303. The working principle of the vacuum cleaner floor brush provided by this invention is as follows: First, the vacuum cleaner floor brush is placed on the ground, and the sealing mechanism is in the unsealing position. Then, the motor is started, which drives the blades to rotate at high speed, so that the ventilation duct formed by the inner cavity of the vacuum hood 3 and the inner cavity of the air outlet duct 101 forms a negative pressure. Under the action of negative pressure, the air inlet 303 generates suction, thereby sucking the dust on the ground into the ventilation duct. After that, it enters the dust collection box through the filtration system. After the vacuuming work is completed, the vacuum cleaner floor brush is picked up for easy storage. When the vacuum cleaner floor brush is picked up, the sealing mechanism automatically enters the sealing position and seals the air inlet 303. Therefore, even if there is shaking and vibration when the vacuum cleaner floor brush is picked up, the dust adhering to the inner wall of the ventilation duct will not flow out from the air inlet 303 and will not contaminate the ground again.In existing technologies, the air inlets are all open. When the floor brush is picked up from the ground after vacuuming, the vibration or shaking of the brush can cause dust adhering to the inner wall of the brush to easily flow out of the suction port, resulting in dust falling back onto the cleaned floor.

[0041] In this embodiment, by setting a sealing mechanism on the base 5, the air inlet 303 can be kept open without hindering the vacuuming operation when the vacuum cleaner is working. At the same time, the air inlet 303 can be blocked when the vacuum cleaner brush is picked up after the vacuuming operation is completed. Thus, even if the vacuum cleaner brush shakes or vibrates when it is picked up, the dust adhering to the inner wall of the ventilation duct will not flow out from the air inlet 303, thereby preventing the cleaned floor from being covered with dust again. This effectively solves the shortcomings of the prior art.

[0042] In this embodiment, a first roller 2 is rotatably mounted on the top cover 1 of the floor brush. The first roller 2 is also rotatably mounted on the base 5. Two second rollers 4 are symmetrically arranged on the base 5. The base 5 has two insertion ports 502 for inserting the two second rollers 4 respectively. The bottoms of the first roller 2 and the two second rollers 4 protrude from the bottom of the base 5 and abut against the ground, thereby reducing the friction between the floor brush of the vacuum cleaner and the ground, making the floor brush of the vacuum cleaner move more smoothly on the ground.

[0043] In this embodiment, each of the two second rollers 4 is elastically slidable vertically via an elastic mechanism 9. The elastic mechanism 9 is mounted on the base 5, and the second rollers 4 are rotatably connected to the elastic mechanism 9. When the vacuum cleaner floor brush is placed on the ground, under the weight of the base 5, the two second rollers 4 elastically slide vertically upward a certain distance. This elastic sliding of the two second rollers 4 in the vertical direction allows the base 5 to absorb shock during movement. Simultaneously, the first roller 2 is elastically slidable vertically via another elastic mechanism 9. The first roller 2 is rotatably connected to the elastic mechanism 9, and the elastic mechanism 9 connected to the first roller 2 is mounted on the floor brush cover 1 or on the base 5. This ensures that when the vacuum cleaner floor brush is placed on the ground, under the weight of the base 5, both the two second rollers 4 and the first roller 2 can elastically slide vertically upward a certain distance, thus maintaining the force balance of the vacuum cleaner floor brush.

[0044] In this embodiment, the elastic mechanism 9 includes two symmetrically arranged fixed plates 901, which are fixedly mounted on the base 5. Each fixed plate 901 has a guide groove on its opposite side, and the guide grooves are vertically arranged. A slider 903 is slidably disposed within each guide groove, and the slider 903 can only slide up and down along the vertical direction of the guide groove. A second roller 4 is rotatably disposed between the two sliders 903. A first compression spring 902 is connected between the top surface of the slider 903 and the top surface of the guide groove. One end of the first compression spring 902 is fixedly connected to the top surface of the slider 903, and the other end is fixedly connected to the top surface of the guide groove. A second compression spring 904 is connected between the bottom surface of the slider 903 and the bottom surface of the guide groove. One end of 904 is fixedly connected to the bottom surface of slider 903, and the other end is fixedly connected to the bottom surface of guide groove. In the initial state, the compression force of the first compression spring 902 and the second compression spring 904 is the same, so that the second roller 4 is stably located at a specific height. When the vacuum cleaner brush is placed on the ground, the gravity of the base 5 presses down on each of the first compression springs 902, so that the second roller 4 drives the corresponding slider 903 to slide upward, so that each of the first compression springs 902 is further compressed. When the vacuum cleaner brush is picked up from the ground, the downward pressure of the base 5 on each of the first compression springs 902 disappears. At this time, each of the first compression springs 902 releases its compression force, so that the corresponding slider 903 slides down to reset, thereby driving the second roller 4 to move down to reset.

[0045] Furthermore, the sealing mechanism is connected to the second roller 4 via a transmission. When the vacuum cleaner's floor brush is on the ground, the weight of the base 5 compresses the first compression springs 902, driving the second roller 4 to move upwards. The upward movement of the second roller 4 moves the sealing mechanism to the unsealing position. By utilizing the upward movement of the second roller 4, the sealing mechanism can automatically adjust to the unsealing position when the vacuum cleaner's floor brush contacts the ground, thus eliminating the need for separate operation of the sealing mechanism to enter the unsealing position, making it more intelligent.

[0046] Furthermore, the sealing mechanism is elastically rotatably connected to the base 5. The elastic rotational force of the sealing mechanism is directed towards the air inlet 303, and the elastic rotational force of the sealing mechanism does not hinder the upward movement of the second roller 4. Thus, when the vacuum cleaner floor brush is picked up, under the action of the elastic rotational force, one end of the sealing mechanism rotates towards the air inlet 303 to block the air inlet 303. At the same time, under the action of the elastic rotational force, the sealing mechanism will not open the air inlet 303 on its own, so that the dust adhering in the ventilation duct will not flow out from the air inlet 303 on its own. It can be seen that the sealing mechanism can automatically adjust to the sealing position when the vacuum cleaner floor brush is picked up, thereby realizing the conversion from the unsealing position to the sealing position in the first time, sealing the air inlet 303 in time, and eliminating the need for separate operation of the sealing mechanism to enter the sealing position, further improving the intelligence.

[0047] In a preferred embodiment, the sealing mechanism includes two swing rods 6 that abut against the tops of the two second rollers 4 respectively. One end of each swing rod 6 is elastically rotatably connected to the base 5. The base 5 is fixedly provided with two sets of support plates 501 corresponding to the two swing rods 6. Each set of support plates 501 includes two support plates 501. The swing rods 6 are located between the corresponding two support plates 501. A rotating shaft 8 is rotatably inserted into the swing rod 6. The two ends of the rotating shaft 8 are rotatably inserted into the two support plates 501 respectively. The other end of the two swing rods 6 is fixedly installed with a sealing plate 14 that slides against the inner wall of the base 5. The elastic rotational force of the swing rod 6 is directed towards the air inlet 303. The air inlet 303 is located below the sealing plate 14, so that when the swing rod 6 drives the sealing plate 14 to rotate downward elastically, the air inlet 303 is blocked.

[0048] Furthermore, the base 5 has clearance holes 304 on the side away from the air inlet 303, corresponding to the two swing rods 6. The swing rods 6 pass through the corresponding clearance holes 304. The vertical length of the clearance holes 304 is greater than the diameter of the swing rods 6, so that the swing rods 6 have space to rotate up and down. Each clearance hole 304 is sealed with an elastic pad 7. At this time, the elastic pad 7 acts as a seal for the ventilation duct to prevent air leakage. The swing rods 6 pass through the elastic pads 7 and are sealed at the penetration point of the elastic pads 7, so that the swing rods 6 will not damage the airtightness of the ventilation duct when rotating up and down after passing through the elastic pads 7. The width of the elastic pad 7 is greater than the width of the clearance hole 304. The swing rods 6 pass through the center of the elastic pads 7, so that the elastic pads 7 can undergo corresponding elastic deformation as the swing rods 6 rotate up and down. The elastic pads 7 provide a downward pulling force to the swing rods 6, so that the swing rods 6 have a downward rotational force. At this time, the elastic pads 7 serve to provide a downward rotational force for the swing rods 6.

[0049] Specifically, in the initial state, under the combined action of the first compression spring 902 and the second compression spring 904, the two second rollers 4 are positioned at a specific height. At this time, under the elastic force of the elastic pad 7, the sealing plate 14 blocks the air inlet 303. The bottom of the sealing plate 14 abuts and presses tightly against the bottom of the inner cavity of the dust cover 3 to ensure the stability of the sealing plate 14 and prevent it from rotating when the vacuum cleaner floor brush shakes or vibrates. When the vacuum cleaner floor brush is placed on the bottom surface, the bottom surfaces of the first roller 2 and the two second rollers 4 abut against the ground. Under the gravity of the base 5, the first roller 2 and the two second rollers 4 move upwards. The upward movement of each second roller 4 pushes the corresponding swing rod 6 to rotate upward around the pivot 8. The upward rotation of the swing rod 6 drives the sealing plate 14 to rotate upward synchronously. At this time, the bottom of the sealing plate 14 gradually moves away from the air inlet 303 so that the air inlet 303 opens, until the second roller 4 moves upward to its limit. After that, the motor can be driven to perform the vacuuming work. After the vacuuming work is completed, when the vacuum cleaner floor brush is picked up, the downward pressure of the base 5 on the two second rollers 4 disappears. At this time, under the action of the first compression spring 902, the second compression spring 904 and the elastic pad 7, the second roller 4 and the sealing plate 14 are reset so that the air inlet 303 is resealed.

[0050] During the vacuuming process, the first roller 2 and the two second rollers 4 can still rotate under the action of friction with the ground. Since the two second rollers 4 abut against the corresponding swing rods 6 during rotation, and the positions where the two swing rods 6 abut against the corresponding second rollers 4 are provided with protruding ridges (not shown in the figure), under the action of the protruding ridges, the swing rods 6 can clean the dust and debris adhering to the outer surface of the rotating second rollers 4, so as to keep the outer surface of the second rollers 4 clean.

[0051] In this embodiment, the side plate of the dust hood 3 that slides and fits with the sealing plate 14 is an arc-shaped plate 302. The air inlet 303 is located at the bottom of the arc-shaped plate 302. The sealing plate 14 is also arc-shaped. The center of the arc of the arc-shaped plate 302, the center of the arc of the sealing plate 14 and the rotation center of the swing rod 6 coincide, so that the sealing plate 14 always fits with the inner wall of the arc-shaped plate 302 during the rotation process, so that the sealing plate 14 has a better sealing effect on the air inlet 303.

[0052] In this embodiment, two limiting mechanisms corresponding to the two swing rods 6 are also included. The limiting mechanisms abut against the top of the swing rods 6 to limit the maximum upward rotation angle of the sealing plate 14. By setting the limiting structure, the maximum upward rotation angle of the sealing plate 14 is restricted, allowing the sealing plate 14 to adjust the area of ​​the air inlet 303, thereby controlling the size of the air inlet 303. When the air inlet 303 decreases, its suction force increases. Therefore, by controlling the maximum upward rotation angle of the sealing plate 14 through the limiting mechanisms, the suction force of the air inlet 303 can be adjusted. This allows for the reasonable reduction of the air inlet 303 when the vacuum cleaner's suction force is insufficient, thereby improving the vacuum cleaner's suction force. Thus, it is evident that the sealing plate 14 also plays a role in adjusting the suction force of the air inlet 303.

[0053] The limiting mechanism includes a threaded rod 10 fixedly mounted on the base 5, with a top sleeve 11 screwed onto the threaded rod 10. Rotating the top sleeve 11 in both directions allows it to move upwards and downwards. The top of the top sleeve 11 rotatably engages with a limiting frame 12, ensuring that the limiting frame 12 can only rotate horizontally relative to the top sleeve 11 without disengaging. Rotating the top sleeve 11 causes it to move up and down along the threaded rod 10, which in turn causes the limiting frame 12 to move up and down synchronously. A swing rod 6 passes through the frame opening 1201 of the limiting frame 12, with its top abutting against the top of the frame opening 1201, thus limiting the swing rod 6. The vertical length of the frame opening 1201 on the limiting frame 12 is greater than the diameter of the swing rod 6, allowing the swing rod 6 room to rotate downwards. Specifically, when the top sleeve 11 is rotated in the forward direction, the top sleeve 11 drives the limiting frame 12 to move upward synchronously. At this time, the maximum upward rotation angle of the swing rod 6 increases, thereby increasing the maximum upward rotation angle of the sealing plate 14. When the top sleeve 11 is rotated in the reverse direction, the top sleeve 11 drives the limiting frame 12 to move downward synchronously. At this time, the maximum upward rotation angle of the swing rod 6 and the sealing plate 14 decreases. When the vacuum cleaner floor brush is placed on the ground, the sealing plate 14 can block part of the air inlet 303, thereby improving the suction force of the air inlet 303. Meanwhile, as the maximum upward rotation angle of the swing rod 6 and the sealing plate 14 decreases, the upward movement distance of the second roller 4 also decreases, which in turn increases the height of the air inlet 303 from the ground, thereby reducing the dust extraction capacity. Therefore, there are multiple second rollers 4 with different diameters, so that the distance between the air inlet 303 and the ground can be adjusted by replacing the second rollers 4 with different diameters. The shaft of the second roller 4 includes an axially arranged first shaft and a second shaft. The first shaft and the second shaft are keyed to the second roller 4 and can slide axially. A spring is connected between the first shaft and the second shaft. Under the action of the spring force, the first shaft and the second shaft are respectively rotated and inserted into the corresponding slider 903. The second roller 4 can be disassembled by pressing the first shaft or the second shaft inward. The installation of the second roller 4 is the same and will not be described in detail.

[0054] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A vacuum cleaner floor brush, comprising: A brush cover (1) is provided with an air outlet pipe (101). A base (5) is detachably mounted on the bottom of the floor brush cover (1); characterized in that, Also includes: A dust hood (3) is sealed on the base (5), the air outlet pipe (101) is connected to the inner cavity of the dust hood (3), and an air inlet (303) is provided on the dust hood (3). A sealing mechanism is provided on the base (5) and has a sealing station and a desealing station; When the vacuum cleaner floor brush is on the ground for vacuuming, the sealing mechanism is in the unsealing position to allow the air inlet (303) to be open; when the vacuum cleaner floor brush is picked up, the sealing mechanism is in the sealing position to seal the air inlet (303). The top cover (1) of the floor brush is rotatably provided with a first roller (2), and the base (5) is rotatably provided with two symmetrically arranged second rollers (4). The two second rollers (4) are each elastically slidably disposed in the vertical direction through an elastic mechanism (9), and the second rollers (4) are rotatably connected to the elastic mechanism (9); The elastic mechanism (9) includes two symmetrically arranged fixed plates (901). A guide groove is opened on the opposite side of each of the two fixed plates (901). A slider (903) is slidably arranged in each of the two guide grooves. The second roller (4) is rotatably arranged between the two sliders (903). A first compression spring (902) is connected between the top surface of the slider (903) and the top surface of the guide groove. A second compression spring (904) is connected between the bottom surface of the slider (903) and the bottom surface of the guide groove. The sealing mechanism is connected to the second roller (4) in a transmission. When the vacuum cleaner floor brush is on the ground, it compresses each of the first compression springs (902) under the action of the gravity of the base (5) to drive the second roller (4) to move upward. The upward movement of the second roller (4) drives the sealing mechanism to the unsealing position. The sealing mechanism is elastically rotatably connected to the base (5). When the vacuum cleaner floor brush is picked up, under the action of elastic rotation force, one end of the sealing mechanism rotates toward the air inlet (303) to block the air inlet (303).

2. The vacuum cleaner floor brush according to claim 1, characterized in that: The sealing mechanism includes two swing rods (6) that abut against the tops of the two second rollers (4) respectively. One end of each swing rod (6) is elastically rotatably connected to the base (5). The other end of the two swing rods (6) is fixedly installed with a sealing plate (14) that slides against the inner wall of the base (5). The elastic rotation force of the swing rod (6) is directed towards the air inlet (303). The air inlet (303) is located below the sealing plate (14) so ​​that the air inlet (303) is blocked when the swing rod (6) drives the sealing plate (14) to rotate downward elastically.

3. The vacuum cleaner floor brush according to claim 2, characterized in that: The base (5) has clearance holes (304) on the side away from the air inlet (303) that correspond one-to-one with the two swing rods (6). The swing rods (6) pass through the corresponding clearance holes (304). Each clearance hole (304) is sealed with an elastic pad (7). The swing rod (6) passes through the elastic pad (7) and is sealed with the penetration point of the elastic pad (7).

4. The vacuum cleaner floor brush according to claim 2, characterized in that: The side plate of the dust hood (3) and the sealing plate (14) that slides together is an arc plate (302). The air inlet (303) is located at the bottom of the arc plate (302). The sealing plate (14) is also arc-shaped. The center of the arc of the arc plate (302), the center of the arc of the sealing plate (14) and the rotation center of the swing rod (6) coincide.

5. The vacuum cleaner floor brush according to claim 2, characterized in that: It also includes two limiting mechanisms corresponding to the two swing rods (6), which abut against the top of the swing rods (6) to limit the maximum angle of upward rotation of the sealing plate (14).

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