A control material peristaltic pump for a stirring device for paint production

Abstract

The present application relates to peristaltic pump technical field, especially to a kind of material control peristaltic pump for stirring equipment for paint production, including peristaltic pump shell, roller frame is rotationally connected and arranged in peristaltic pump shell, material conveying hose is arranged in peristaltic pump shell, the auxiliary recovery plate is slidably arranged in the inner wall of both sides of peristaltic pump shell, the adjusting plate is slidably arranged in the inner wall of the top of peristaltic pump shell, vibration mechanism is rotationally connected and arranged in the outer wall of one side of peristaltic pump shell, motor is fixedly arranged in one side of peristaltic pump shell, gas guide cover is sleeved outside motor, pipe rack is fixedly connected and arranged in one side of the bottom of peristaltic pump shell, when roller frame is extruded and material conveying hose is fed by motor, adjusting plate can be automatically driven to move, so that adjusting plate can drive two auxiliary recovery plates to extrude the both sides of material conveying hose after extrusion, more uniform recovery pressure can be provided, help material conveying hose to restore to original shape, thereby extend the service life of material conveying hose.

Description

Technical Field

[0001] This invention relates to the field of peristaltic pump technology, and in particular to a peristaltic pump for controlling material flow in a mixing device for paint production. Background Technology

[0002] In paint production, peristaltic pumps are commonly used for the precise delivery and metering of various liquid raw materials. Peristaltic pumps move liquids by squeezing a flexible tube in a pipeline, making them suitable for applications requiring high viscosity materials or where leakage must be avoided. Their advantages include preventing direct contact between the liquid and the pump body, thus reducing the risk of contamination, and enabling precise flow control to ensure accurate dispensing. In paint production, peristaltic pumps effectively and precisely deliver pigments, resins, solvents, and other components to the mixing container. Combined with mixing equipment, this ensures uniform mixing of the paint and precise control of the proportions of different components, improving production efficiency and product quality.

[0003] The prior art publication CN117212110A provides a peristaltic pump that, by limiting the cross-sectional expansion of the pump tube between the pump tube release port A and the pump tube inlet / outlet B, avoids the uneven flow rate caused by the change in pump tube volume due to roller compression and release, thereby improving the smoothness of fluid delivery and the stability of flow rate.

[0004] In the operation of a peristaltic pump, material is conveyed by continuously squeezing the hose, and then the hose returns to its original shape to allow for feeding. However, existing technology does not facilitate the recovery of the hose after squeezing, which means that the hose material will undergo repeated compression and recovery during long-term use. Excessive bending and stretching will reduce the elasticity of the hose, making it unable to return to its original shape. Elastic fatigue prevents the hose from fully recovering, resulting in a weakened pump suction capacity, poor feeding, and reduced production efficiency.

[0005] In summary, the existing technology lacks a technique for assisting in the restoration of the material delivery hose in a peristaltic pump. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of the prior art by providing a peristaltic pump for a mixing device used in paint production.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a peristaltic pump for a mixing device in paint production, comprising a peristaltic pump housing, a roller frame rotatably connected inside the peristaltic pump housing, a material conveying hose inside the peristaltic pump housing, auxiliary recovery plates slidably fitted on both inner walls of the peristaltic pump housing, an adjusting plate slidably fitted on the inner wall of the top of the peristaltic pump housing, a vibration mechanism rotatably connected to one outer wall of the peristaltic pump housing, a motor fixedly mounted on one side of the peristaltic pump housing, an air guide cover sleeved on the outside of the motor, and a pipe rack fixedly connected to one side of the bottom of the peristaltic pump housing.

[0008] Preferably, one side of the auxiliary recovery plate is in movable contact with the outer wall of the conveying hose, and the other side of the auxiliary recovery plate is fixedly connected with multiple tension springs. The other end of each tension spring is fixedly connected to the inner wall of the peristaltic pump housing. One of the auxiliary recovery plates is fixedly connected with a guide rod on the side connected to the tension spring. The guide rod is slidably engaged with the inner wall of the peristaltic pump housing.

[0009] Preferably, the adjusting plate has two symmetrical transmission grooves, and a transmission shaft is slidably fitted on the inner wall of the transmission groove. A connecting frame is rotatably connected between the two ends of the transmission shaft, and one end of the connecting frame is fixedly connected to the auxiliary restoration plate.

[0010] Preferably, one end of the adjusting plate extends through the inner wall of the peristaltic pump housing to the outside and is fixedly connected to a sliding rod, and one end of the sliding rod is rotatably connected to a contact wheel.

[0011] Preferably, the vibration mechanism includes a fixed ring, which is fixedly connected to the outer wall of the peristaltic pump housing. Multiple rotating shafts are rotatably connected to the fixed ring, and a striking rod is fixedly connected to each rotating shaft. One end of the striking rod is in movable contact with the outer wall of the guide rod, and a spring is fixedly connected to the striking rod. The other end of the spring is fixedly connected to the fixed ring, and an adjusting wheel is fixedly connected to the other end of the rotating shaft.

[0012] Preferably, the vibration mechanism further includes a transmission wheel A, which is rotatably connected to the outer wall of the peristaltic pump housing. A sector gear is fixedly connected to one end of the transmission wheel A, and the sector gear meshes with the adjusting wheel for transmission.

[0013] Preferably, the motor output end extends through the outer wall of the peristaltic pump housing into the interior and is fixedly connected to the roller frame. A concave-convex disc is fixedly connected to the motor output end. The outer wall of the concave-convex disc is in sliding contact with the outer wall of the contact wheel. A drive gear is fixedly connected to one side of the concave-convex disc. The drive gear is engaged with the transmission wheel A for transmission.

[0014] Preferably, a fan blade is rotatably connected inside the exhaust end of the air guide shroud, a driven wheel is fixedly connected to one end of the fan blade, a universal joint is rotatably connected through the exhaust end of the air guide shroud, a transmission wheel B is fixedly connected to one end of the universal joint, the transmission wheel B meshes with the drive gear plate for transmission, and a driving wheel is fixedly connected to one end of the universal joint located inside the air guide shroud, the driving wheel meshes with the driven wheel for transmission.

[0015] Preferably, an air inlet pipe and an exhaust pipe are symmetrically and fixedly connected on the pipe rack. The air inlet pipe and the exhaust pipe are fixedly connected through the inner wall of the peristaltic pump housing. A baffle is rotatably connected to the pipe rack. Filter plates are fixedly connected to the two openings on the baffle. The outer wall of the baffle is in sliding contact with the exhaust end of the air guide hood and one side of the air inlet pipe and the exhaust pipe. A worm gear is rotatably connected to the pipe rack. A worm wheel is fixedly connected to one end of the filter plate. The worm wheel and the worm gear are meshed and driven together.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] By setting auxiliary recovery plates, when the motor drives the roller frame to squeeze and convey material into the conveying hose, it can automatically drive the adjustment plate to move. This allows the adjustment plate to drive two auxiliary recovery plates to assist in squeezing both sides of the squeezed conveying hose, providing more uniform recovery pressure and helping the conveying hose return to its original shape. This effectively reduces the deformation or indentation of the conveying hose caused by uneven local pressure, thereby extending the service life of the conveying hose. Through this auxiliary recovery method, the resilience of the conveying hose can be improved, avoiding permanent deformation caused by frequent squeezing and recovery, and improving the efficiency and reliability of the pump.

[0018] By setting up a vibration mechanism, when the motor drives the roller frame to squeeze and convey the material to the conveying hose, it can drive the vibration mechanism so that the striking rod strikes the guide rod, thereby generating vibration of the auxiliary restoration plate. The dynamic effect of the vibration helps to accelerate the restoration process of the conveying hose, especially in high-frequency operations, which can improve the speed at which the conveying hose returns to its original shape and reduce conveying problems caused by abnormal shape of the conveying hose.

[0019] By setting up an air guide hood, when the motor drives the roller frame to squeeze and convey materials through the conveying hose, it can drive the fan blades to rotate. This draws the hot air around the motor into the peristaltic pump housing, providing a certain degree of auxiliary heating to the conveying hose and coating raw materials. This can increase the temperature of the conveying hose and coating raw materials, thereby improving the flowability and flow stability of the raw materials and reducing the problems of excessive viscosity or poor conveying caused by excessively low temperature of the coating raw materials. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the overall structure of a peristaltic pump for a mixing device used in paint production according to the present invention;

[0021] Figure 2 This is a partial cross-sectional schematic diagram of the overall structure of a peristaltic pump for a mixing device in paint production according to the present invention;

[0022] Figure 3 This is a schematic diagram of the auxiliary recovery plate structure of a peristaltic pump for a mixing device in paint production according to the present invention;

[0023] Figure 4 This is a schematic diagram of the regulating plate structure of a peristaltic pump for a mixing device in paint production according to the present invention.

[0024] Figure 5 This is a schematic diagram of the vibration mechanism of a peristaltic pump for a mixing device in paint production according to the present invention.

[0025] Figure 6 This is a schematic diagram showing the motor structure of a peristaltic pump for a mixing device in paint production according to the present invention.

[0026] Figure 7 This is a partial cross-sectional schematic diagram of the air guide shroud structure of a peristaltic pump for a mixing device in paint production according to the present invention.

[0027] Figure 8 This is a schematic diagram of the pipe frame structure of a peristaltic pump for a mixing device used in paint production according to the present invention.

[0028] The diagram shows: 1. Peristaltic pump housing; 2. Roller frame; 3. Feed hose; 4. Auxiliary recovery plate; 5. Adjusting plate; 6. Vibration mechanism; 7. Motor; 8. Air guide hood; 9. Pipe rack; 401. Tension spring; 402. Guide rod; 501. Transmission spur groove; 502. Transmission shaft; 503. Connecting frame; 504. Sliding rod; 505. Contact wheel; 601. Fixing ring; 602. Rotating shaft; 603. 604. Striking rod; 605. Spring; 606. Adjusting wheel; 607. Drive wheel A; 608. Sector gear; 701. Concave-convex disc; 702. Drive gear disc; 801. Fan blade; 802. Driven wheel; 803. Universal joint; 804. Drive wheel B; 805. Drive wheel; 901. Intake pipe; 902. Exhaust pipe; 903. Baffle; 904. Filter plate; 905. Worm; 906. Worm wheel. Detailed Implementation

[0029] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0030] like Figures 1-8The diagram shows a peristaltic pump for a mixing device used in paint production. It includes a peristaltic pump housing 1, a roller frame 2 rotatably connected inside the housing 1, a material conveying hose 3 inside the housing 1, auxiliary recovery plates 4 slidingly fitted on both inner walls of the housing 1, an adjusting plate 5 slidingly fitted on the inner wall of the top of the housing 1, a vibration mechanism 6 rotatably connected to one outer wall of the housing 1, a motor 7 fixedly mounted on one side of the housing 1, an air guide cover 8 sleeved on the outside of the motor 7, and a pipe rack 9 fixedly connected to one side of the bottom of the housing 1.

[0031] like Figure 3 As shown, one side of the auxiliary recovery plate 4 is in movable contact with the outer wall of the conveying hose 3, and multiple tension springs 401 are fixedly connected to the other side of the auxiliary recovery plate 4. The other end of the tension spring 401 is fixedly connected to the inner wall of the peristaltic pump housing 1. A guide rod 402 is fixedly connected to the side of one of the auxiliary recovery plates 4 connected to the tension spring 401. The guide rod 402 is slidably engaged with the inner wall of the peristaltic pump housing 1.

[0032] By setting up auxiliary recovery plates 4, when the motor 7 drives the roller frame 2 to squeeze and convey material onto the conveying hose 3, it can automatically drive the adjusting plate 5 to move. This allows the adjusting plate 5 to drive the two auxiliary recovery plates 4 to assist in squeezing both sides of the squeezed conveying hose 3, providing more uniform recovery pressure and helping the conveying hose 3 return to its original shape. This effectively reduces deformation or indentation of the conveying hose 3 caused by uneven local pressure, thereby extending the service life of the conveying hose 3. Through this auxiliary recovery method, the resilience of the conveying hose 3 can be improved, avoiding permanent deformation caused by frequent squeezing and recovery, and improving the efficiency and reliability of the pump.

[0033] like Figure 4 As shown, the adjusting plate 5 has two symmetrical transmission grooves 501. The inner wall of the transmission groove 501 is fitted with a transmission shaft 502. A connecting frame 503 is rotatably connected between the two ends of the transmission shaft 502. One end of the connecting frame 503 is fixedly connected to the auxiliary restoration plate 4.

[0034] One end of the adjusting plate 5 extends through the inner wall of the peristaltic pump housing 1 to the outside and is fixedly connected to a sliding rod 504. One end of the sliding rod 504 is rotatably connected to a contact wheel 505. When the output end of the motor 7 rotates, it will drive the connected convex and concave disc 701 to rotate. When the protruding part of the convex and concave disc 701 contacts the contact wheel 505, it will push the sliding rod 504 connected to the contact wheel 505 to move, so that the sliding rod 504 drives the connected adjusting plate 5 to move. At this time, the transmission groove 501 on the adjusting plate 5 will drive the auxiliary recovery plate 4 connected to the connecting frame 503 to move. At this time, the two auxiliary recovery plates 4 that are close to each other will assist in the recovery of the extruded conveying hose 3.

[0035] like Figure 5 As shown, the vibration mechanism 6 includes a fixed ring 601, which is fixedly connected to the outer wall of the peristaltic pump housing 1. Multiple rotating shafts 602 are rotatably connected to the fixed ring 601. A striking rod 603 is fixedly connected to the rotating shaft 602. One end of the striking rod 603 is in movable contact with the outer wall of the guide rod 402. A spring 604 is fixedly connected to the striking rod 603. The other end of the spring 604 is fixedly connected to the fixed ring 601. An adjusting wheel 605 is fixedly connected to the other end of the rotating shaft 602.

[0036] The vibration mechanism 6 also includes a transmission wheel A606, which is rotatably connected to the outer wall of the peristaltic pump housing 1. A sector gear 607 is fixedly connected to one end of the transmission wheel A606, and the sector gear 607 meshes with the adjusting wheel 605 for transmission. When the output end of the motor 7 rotates, it can drive the connected drive gear 702 to rotate. At this time, the drive gear 702 will drive the transmission wheel A606 to rotate, which in turn will drive the connected sector gear 607 to rotate. This causes the sector gear 607 to drive the adjusting wheel 605 to rotate, and then the adjusting wheel 605 will drive the connected rotating shaft 602 to rotate. This causes the rotating shaft 602 to drive the connected striking rod 603 to rotate. Then, under the action of the spring 604, the striking rod 603 will quickly reset and strike the guide rod 402, causing the auxiliary recovery plate 4 connected to the guide rod 402 to vibrate.

[0037] like Figure 6 As shown, the output end of the motor 7 extends through the outer wall of the peristaltic pump housing 1 and is fixedly connected to the roller frame 2. A convex-concave plate 701 is fixedly connected to the output end of the motor 7. The outer wall of the convex-concave plate 701 is in sliding contact with the outer wall of the contact wheel 505. A drive gear plate 702 is fixedly connected to one side of the convex-concave plate 701. The drive gear plate 702 meshes with the transmission wheel A606 for transmission.

[0038] like Figure 7As shown, a fan blade 801 is rotatably connected inside the exhaust end of the air guide shroud 8. A driven wheel 802 is fixedly connected to one end of the fan blade 801. A universal joint 803 is rotatably connected through the exhaust end of the air guide shroud 8. A transmission wheel B804 is fixedly connected to one end of the universal joint 803. The transmission wheel B804 meshes with the drive gear 702 for transmission. A drive wheel 805 is fixedly connected to one end of the universal joint 803 located inside the air guide shroud 8. The drive wheel 805 meshes with the driven wheel 802 for transmission. When the drive gear 702 rotates, it will drive the universal joint 803 connected to the transmission wheel B804 to rotate, so that the universal joint 803 drives the drive wheel 805 to rotate. Then the drive wheel 805 can drive the fan blade 801 connected to the driven wheel 802 to rotate, so that the air guide shroud 8 draws the heated air around the motor 7 into the air guide shroud 8, and after being filtered by the filter plate 904, it is injected into the peristaltic pump housing 1 through the air inlet pipe 901.

[0039] like Figure 8 As shown, an intake pipe 901 and an exhaust pipe 902 are symmetrically and fixedly connected to the pipe frame 9. The intake pipe 901 and the exhaust pipe 902 are fixedly connected to the inner wall of the peristaltic pump housing 1. A baffle 903 is rotatably connected to the pipe frame 9. Filter plates 904 are fixedly connected to the two openings on the baffle 903. The outer wall of the baffle 903 is in sliding contact with the exhaust end of the air guide shroud 8 and one side of the intake pipe 901 and the exhaust pipe 902. A worm gear 905 is rotatably connected to the pipe frame 9. A worm wheel 906 is fixedly connected to one end of the filter plate 904. The worm wheel 906 and the worm gear 905 are meshed and driven. By rotating the worm gear 905, the baffle 903 connected to the worm wheel 906 can be rotated, causing the filter plate 904 on the baffle 903 to move away, making it convenient to clean the filter plate 904.

[0040] Working principle: When conveying raw materials during paint production, the motor 7 first drives the connected roller frame 2 to rotate. At this time, the rollers on the roller frame 2 will contact and squeeze the conveying hose 3, thereby squeezing the raw materials in the conveying hose 3 to the other end to achieve feeding.

[0041] At the same time, when the output end of the motor 7 rotates, it will drive the connected concave-convex disc 701 to rotate. When the protruding part of the concave-convex disc 701 contacts the contact wheel 505, it will push the sliding rod 504 connected to the contact wheel 505 to move, so that the sliding rod 504 drives the connected adjusting plate 5 to move. At this time, the transmission inclined groove 501 on the adjusting plate 5 will drive the auxiliary restoration plate 4 connected to the connecting frame 503 to move. At this time, the two auxiliary restoration plates 4 that are close to each other will assist in the restoration of the extruded conveying hose 3. Then, the tension spring 401 will drive the auxiliary restoration plate 4 to automatically reset.

[0042] Then, when the output end of the motor 7 rotates, it can drive the connected drive gear 702 to rotate. At this time, the drive gear 702 will drive the transmission wheel A606 to rotate. At this time, the transmission wheel A606 will drive the connected sector gear 607 to rotate, so that the sector gear 607 drives the adjusting wheel 605 to rotate. Then the adjusting wheel 605 will drive the connected rotating shaft 602 to rotate, so that the rotating shaft 602 can drive the connected striking rod 603 to rotate. Then, under the action of the spring 604, the striking rod 603 will quickly reset and strike the guide rod 402, so that the auxiliary restoration plate 4 connected to the guide rod 402 will vibrate, which improves the restoration effect of the conveying hose 3.

[0043] At the same time, when the drive gear 702 rotates, it will drive the universal joint 803 connected to the transmission wheel B804 to rotate, so that the universal joint 803 drives the drive wheel 805 to rotate. Then the drive wheel 805 can drive the fan blade 801 connected to the driven wheel 802 to rotate, so that the air guide shroud 8 draws the heated air around the motor 7 into the air guide shroud 8, and after being filtered by the filter plate 904, it is injected into the peristaltic pump housing 1 through the air inlet pipe 901 to provide auxiliary heating for the internal conveying hose 3 and raw materials.

[0044] Then, by rotating the worm gear 905, the baffle 903 connected to the worm wheel 906 can be rotated, causing the filter plate 904 of the baffle 903 to be moved away, making it convenient to clean the filter plate 904.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A peristaltic pump for a mixing device in paint production, comprising a peristaltic pump housing (1), characterized in that: A roller frame (2) is rotatably connected inside the peristaltic pump housing (1). A conveying hose (3) is installed inside the peristaltic pump housing (1). Auxiliary recovery plates (4) are slidably fitted on both inner walls of the peristaltic pump housing (1). An adjusting plate (5) is slidably fitted on the inner wall of the top of the peristaltic pump housing (1). A vibration mechanism (6) is rotatably connected to one outer wall of the peristaltic pump housing (1). A motor (7) is fixedly installed on one side of the peristaltic pump housing (1). An air guide cover (8) is fitted on the outside of the motor (7). A pipe rack (9) is fixedly connected to one side of the bottom of the peristaltic pump housing (1). One side of the auxiliary recovery plate (4) is in movable contact with the outer wall of the conveying hose (3). Multiple tension springs (401) are fixedly connected to the other side of the auxiliary recovery plate (4). The other end of the tension springs (401) is connected to... The inner wall of the peristaltic pump housing (1) is fixedly connected. One of the auxiliary recovery plates (4) is connected to a tension spring (401) and a guide rod (402) is fixedly connected to one side. The guide rod (402) is slidably connected to the inner wall of the peristaltic pump housing (1). The adjusting plate (5) has two symmetrical transmission grooves (501). The inner wall of the transmission groove (501) is slidably connected to a transmission shaft (502). A connecting frame (503) is rotatably connected between the two ends of the transmission shaft (502). One end of the connecting frame (503) is fixedly connected to the auxiliary recovery plate (4). One end of the adjusting plate (5) extends through the inner wall of the peristaltic pump housing (1) to the outside and is fixedly connected to a sliding rod (504). One end of the sliding rod (504) is rotatably connected to a contact wheel (505).

2. The peristaltic pump for controlling material flow in a mixing device for paint production according to claim 1, characterized in that: The vibration mechanism (6) includes a fixed ring (601), which is fixedly connected to the outer wall of the peristaltic pump housing (1). Multiple rotating shafts (602) are rotatably connected to the fixed ring (601). A striking rod (603) is fixedly connected to the rotating shaft (602). One end of the striking rod (603) is in movable contact with the outer wall of the guide rod (402). A spring (604) is fixedly connected to the striking rod (603). The other end of the spring (604) is fixedly connected to the fixed ring (601). An adjusting wheel (605) is fixedly connected to the other end of the rotating shaft (602).

3. The peristaltic pump for a mixing device in paint production according to claim 2, characterized in that: The vibration mechanism (6) further includes a transmission wheel A (606), which is rotatably connected to the outer wall of the peristaltic pump housing (1). A sector gear (607) is fixedly connected to one end of the transmission wheel A (606), and the sector gear (607) meshes with the adjusting wheel (605) for transmission.

4. The peristaltic pump for a mixing device in paint production according to claim 3, characterized in that: The output end of the motor (7) extends through the outer wall of the peristaltic pump housing (1) and is fixedly connected to the roller frame (2). A convex-concave disc (701) is fixedly connected to the output end of the motor (7). The outer wall of the convex-concave disc (701) is in sliding contact with the outer wall of the contact wheel (505). A drive gear disc (702) is fixedly connected to one side of the convex-concave disc (701). The drive gear disc (702) meshes with the transmission wheel A (606) for transmission.

5. A peristaltic pump for a mixing device in paint production according to claim 4, characterized in that: A fan blade (801) is rotatably connected inside the exhaust end of the air guide cover (8). A driven wheel (802) is fixedly connected to one end of the fan blade (801). A universal joint (803) is rotatably connected through the exhaust end of the air guide cover (8). A transmission wheel B (804) is fixedly connected to one end of the universal joint (803). The transmission wheel B (804) meshes with the drive gear (702) for transmission. A drive wheel (805) is fixedly connected to one end of the universal joint (803) inside the air guide cover (8). The drive wheel (805) meshes with the driven wheel (802) for transmission.

6. The peristaltic pump for controlling material flow in a mixing device for paint production according to claim 1, characterized in that: The tube frame (9) is symmetrically and fixedly connected with an air inlet pipe (901) and an exhaust pipe (902). The air inlet pipe (901) and the exhaust pipe (902) are fixedly connected through the inner wall of the peristaltic pump housing (1). A baffle (903) is rotatably connected to the tube frame (9). A filter plate (904) is fixedly connected to the two openings on the baffle (903). The outer wall of the baffle (903) is in sliding contact with the exhaust end of the air guide hood (8), one side of the air inlet pipe (901) and the exhaust pipe (902). A worm gear (905) is rotatably connected to the tube frame (9). A worm wheel (906) is fixedly connected to one end of the filter plate (904). The worm wheel (906) and the worm gear (905) are meshed and driven.

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