A valve maintenance and inspection device utilizing pressure characteristics

Abstract

The present invention relates to the field of valve detection technology, and discloses a valve maintenance and detection device utilizing pressure characteristics, including an operating table. The present invention starts the first motor counterclockwise, the first motor drives the first threaded rod to rotate, the first threaded rod rotates to move the first slider to the left, the first slider drives the valve and the connecting rod to move, the movement of the connecting rod drives the fixed rod to move, the fixed rod pushes the connecting plate to move in a direction away from the center of the operating table, the connecting plate drives the second slider to move, the second slider drives the stamping mechanism to move, so that the stamping tube is separated from the valve that has been detected on the left side, when the first slider and the center of the operating table are located in the same horizontal plane and continue to move to the left, the connecting rod pulls the fixed rod to move toward the center of the operating table, the first slider moves to the leftmost end of the first threaded rod, the stamping tube docks with the valve on the right side, the valve that has been detected on the left side can be taken out, and a new valve can be placed, the residence time of the valve on the detection table can be shortened, and the detection efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of valve detection, and in particular to a valve maintenance and detection device utilizing pressure characteristics. Background Art

[0002] A valve is a device used to control the flow of fluids (such as liquids, gases or steam). It controls the flow and regulates the pressure by opening, closing or adjusting the path of the fluid. Valves play a vital role in various industrial and building systems. After the valves are processed and produced, the sealing of the valves needs to be checked, and the air tightness of the valves needs to be tested using specific testing devices.

[0003] The application number is CN202311395003.5, which discloses a valve leakage detection device, which relates to the field of valve detection, including a workbench, a control console fixedly connected to the top of the workbench, a top frame fixedly connected to the top of the workbench, a reciprocating screw fixedly connected to the side of the top frame, an electric telescopic rod fixedly connected to the side of the ball nut seat of the reciprocating screw, a pneumatic clamp fixedly connected to the bottom of the telescopic part of the electric telescopic rod, a pneumatic clamp fixedly connected to the top of the top frame, a handwheel groove is provided on the inner vertical surface of the pneumatic clamp, and the valve is placed on the top of the valve seat, so that the flange groove can support the flange connection parts at both ends of the valve body, and the side of the valve body can be limited by the side arc plate. After the valve is inspected, the reciprocating screw and the electric telescopic rod cooperate to operate, so that the detected valve can be transported to the discharge conveyor belt on the rear side, so that a large number of valves can be automatically and quickly detected and transmitted, which solves the problem that the existing detection device is not convenient for automatic and fast detection and transmission of a large number of valves.

[0004] When the device detects the valve, it clamps the valve to the valve seat by the pneumatic clamp, and after the detection is completed, the pneumatic clamp clamps the tested valve to the discharge conveyor belt. This will make the time interval between the two valve detections longer, affecting the work efficiency. Summary of the invention

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention is a valve maintenance and detection device utilizing pressure characteristics, comprising an operating table, a support column being fixedly connected to the bottom of the operating table, a first slide slot being provided on the operating table, a second slide slot being provided on the operating table, and a placement mechanism, wherein the placement mechanism comprises a mounting plate fixedly connected to the top of the operating table, two mounting plates being provided, a first motor being fixedly connected to the right side of the right mounting plate, an output end of the first motor passing through and extending from the left side of the right mounting plate, a first threaded rod being fixedly connected to the output end of the first motor, an end of the first threaded rod being away from the first motor being rotatably connected to the right side of the left mounting plate, a first sliding rod being fixedly connected to the side of the two mounting plates close to each other, a first sliding block being slidably connected to the outer wall of the first sliding rod, and an inner wall of the first sliding block The cam is threadedly connected to an outer wall of the first threaded rod, and a connecting rod is fixedly connected to the central axis of the bottom of the first sliding block, and the connecting rod is slidably connected to the inside of the first sliding groove, and an end of the connecting rod away from the first sliding groove passes through the first sliding groove and extends. The outer wall of the connecting rod is rotatably connected to a fixing rod, and an end of the fixing rod away from the connecting rod is rotatably connected to a connecting plate. The left and right sides of the connecting plate are fixedly connected to the second sliding block, and the second sliding block is slidably connected to the inside of the second sliding groove, and the top of the first sliding block is fixedly connected to a base, and the top of the base is fixedly connected to a placing frame, and the top of the base is fixedly connected to a supporting frame. This configuration is to limit the first sliding block by the first sliding bar, so that when the first motor drives the first threaded rod to rotate, the first sliding block can move along the first threaded rod.

[0007] Furthermore, a stamping mechanism is arranged above the second slider, and the stamping mechanism includes a first slide rail fixedly connected to the top of the second slider, a second threaded rod is rotatably connected inside the first slide rail, and an end of the second threaded rod away from the center of the operating table penetrates the outer wall of the first slide rail and extends.

[0008] Furthermore, a knob is fixedly connected to one end of the second threaded rod away from the center of the operating table, a third slider is threadedly connected to the outer wall of the second threaded rod, the third slider is slidably connected to the inside of the first slide rail, a fixing frame is fixedly connected to the top of the third slider, and a stamping tube is fixedly connected to the inside of the fixing frame. This arrangement is used to limit the first slider by the first slide rail, so that when the second threaded rod is rotated by rotating the knob, the third slider can move along the first slide rail.

[0009] Furthermore, a sealing ring is fixedly connected to one side of the stamping tube close to the center of the operating table, a pressure relief valve is connected to the top of the stamping tube, an air intake pipe is connected to the stamping tube, a pressure monitor is provided on the air intake pipe, and a one-way air valve is provided on the air intake pipe. The pressure relief valve can be used to relieve the pressure on the stamping tube after clamping is completed to avoid accidents during subsequent operations or equipment disassembly.

[0010] Furthermore, a second motor is fixedly connected to the top of the operating table, a fan is fixedly connected to the output end of the second motor, a hose is provided on the top of the fan, and one end of the hose away from the fan is connected to the air inlet pipe.

[0011] Furthermore, a fixing mechanism is arranged above the operating table, and the fixing mechanism includes a mounting frame fixedly connected to the top of the operating table, and two mounting frames are arranged, and a second slide rail is fixedly connected to one side of the two mounting frames close to each other, and a mounting rod is slidably connected inside the second slide rail.

[0012] Furthermore, both ends of the mounting rod pass through the outer wall of the second slide rail and extend, both ends of the mounting rod are fixedly connected to a first pull rod, one end of the first pull rod away from the mounting rod is fixedly connected to the top of the second slider, the outer wall of the mounting rod is rotatably connected to the second pull rod, and the bottom of the second slide rail is fixedly connected to the third slide rail. This arrangement is to drive the first pull rod to move through the movement of the second slider, and the top of the first pull rod pushes the mounting rod to move, thereby causing the mounting rod to push the second pull rod to move.

[0013] Furthermore, a fourth slider is slidably connected inside the third slide rail, a push rod is fixedly connected to the bottom of the fourth slider, an end of the push rod away from the fourth slider passes through the bottom of the third slide rail and extends, an end of the push rod away from the fourth slider is fixedly connected to a pressure plate, and limit rods are fixedly connected to the left and right sides of the fourth slider, and the limit rods are slidably connected to the inside of the third slide rail. In a professional setting, the fourth slider is limited by the limit rod to prevent the fourth slider from escaping from the inside of the third slide rail.

[0014] The present invention has the following beneficial effects:

[0015] The present invention starts the first motor counterclockwise, and the first motor drives the first threaded rod to rotate. The rotation of the first threaded rod will cause the first slider to move to the left, the first slider drives the base and the connecting rod to move, the mounting plate drives the valves on the placement frame and the support frame to move, and the movement of the connecting rod will drive the fixed rod to move. Because the connecting plate is fixedly connected to the second slider, and the second slider is slidably connected inside the second slide groove, the fixed rod will push the connecting plate to move in a direction away from the center of the operating table, the connecting plate drives the second slider to move, and the second slider drives the stamping mechanism to move, so that the stamping pipe is separated from the valve detected on the left side of the first slider. When the center of the first slider and the center of the operating table are located in the same horizontal plane, the first slider continues to move to the left, and the connecting rod pulls the fixed rod to move toward the center of the operating table. When the first slider moves to the leftmost end of the first threaded rod, the stamping pipe on the stamping mechanism will dock with the valve on the right side of the first slider, and the right valve will be detected. At this time, the valve detected on the left side can be taken out and a new valve can be placed. Similarly, the first motor is started clockwise, and the first slider moves from left to right to repeat the above operation, thereby shortening the residence time of the valve on the detection table and improving the detection efficiency.

[0016] The present invention rotates the knob, and the rotation of the knob will drive the second threaded rod to rotate. Because the first slide rail will limit the third slider, when the second threaded rod rotates, the third slider will move along the first slide rail, and the third slider will drive the fixed frame to move, and the fixed frame will drive the stamping tube to move, so that the position of the stamping tube can be adjusted to facilitate the detection of valves of different lengths.

[0017] In the process of the present invention approaching the center of the operating table through the connecting plate, the second slide block drives the first pull rod to move, the first pull rod drives the installation rod to move, the installation rod pushes the second pull rod, the second pull rod pushes the fourth slide block to move downward along the third slide rail, the fourth slide block drives the push rod to move downward, the push rod drives the pressure plate to move, so that the pressure plate contacts the top of the valve, so that the valve can be fixed in the placement frame and the support frame, preventing the valve from shaking during the stamping test, resulting in air leakage at the joint between the stamping tube and the valve, affecting the test result.

[0018] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the overall bottom-up structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure above the operating table of the present invention;

[0023] Figure 4 It is a schematic diagram of the placement mechanism structure of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the punching mechanism of the present invention;

[0025] Figure 6 It is a structural schematic diagram of the fixing mechanism of the present invention;

[0026] Figure 7 A bottom view schematic diagram of the fixing mechanism of the present invention;

[0027] Figure 8 It is a schematic diagram of the third slide rail structure of the present invention.

[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0029] In the figure: 1, operating table; 11, supporting column; 12, first slide; 13, second slide; 2, placing mechanism; 201, mounting plate; 202, first motor; 203, first threaded rod; 204, first slide; 205, first slider; 206, connecting rod; 207, fixing rod; 208, connecting plate; 209, second slider; 210, base; 211, placing rack; 212, supporting rack; 3, stamping mechanism; 301, first slide; 302, second threaded rod; 303, knob; 304, The third slider; 305, the fixing frame; 306, the stamping tube; 307, the sealing ring; 308, the pressure relief valve; 309, the air inlet pipe; 310, the pressure monitor; 311, the one-way air valve; 312, the second motor; 313, the fan; 314, the hose; 4, the fixing mechanism; 401, the mounting frame; 402, the second slide rail; 403, the mounting rod; 404, the first pull rod; 405, the second pull rod; 406, the third slide rail; 407, the fourth slider; 408, the push rod; 409, the pressure plate; 410, the limit rod. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1 - Figure 8 As shown, a valve maintenance and detection device using pressure characteristics includes an operating table 1, a support column 11 is fixedly connected to the bottom of the operating table 1, a first slide groove 12 is opened on the operating table 1, a second slide groove 13 is opened on the operating table 1, and further includes:

[0032] The placing mechanism 2 includes a mounting plate 201 fixedly connected to the top of the operating table 1, and two mounting plates 201 are provided. A first motor 202 is fixedly connected to the right side of the right mounting plate 201, and an output end of the first motor 202 passes through the left side of the right mounting plate 201 and extends. A first threaded rod 203 is fixedly connected to the output end of the first motor 202, and an end of the first threaded rod 203 away from the first motor 202 is rotatably connected to the right side of the left mounting plate 201. A first sliding rod 204 is fixedly connected to the side where the two mounting plates 201 are close to each other, and a first sliding block 205 is slidably connected to the outer wall of the first sliding block 204, and the inner wall of the first sliding block 205 is threadedly connected to the outer wall of the first threaded rod 203 A connecting rod 206 is fixedly connected to the central axis at the bottom of the first slider 205, and the connecting rod 206 is slidably connected to the inside of the first slide groove 12. The end of the connecting rod 206 away from the first slider 205 passes through the first slide groove 12 and extends. The outer wall of the connecting rod 206 is rotatably connected to a fixed rod 207, and the end of the fixed rod 207 away from the connecting rod 206 is rotatably connected to a connecting plate 208. The left and right sides of the connecting plate 208 are fixedly connected to the second slider 209, and the second slider 209 is slidably connected to the inside of the second slide groove 13. The top of the first slider 205 is fixedly connected to a base 210, the top of the base 210 is fixedly connected to a placement rack 211, and the top of the base 210 is fixedly connected to a support rack 212.

[0033] A stamping mechanism 3 is arranged above the second slider 209, and the stamping mechanism 3 includes a first slide rail 301 fixedly connected to the top of the second slider 209, a second threaded rod 302 is rotatably connected inside the first slide rail 301, and an end of the second threaded rod 302 away from the center of the operating table 1 passes through the outer wall of the first slide rail 301 and extends.

[0034] The end of the second threaded rod 302 away from the center of the operating table 1 is fixedly connected with a knob 303, the outer wall of the second threaded rod 302 is threadedly connected with a third slider 304, the third slider 304 is slidably connected to the inside of the first slide rail 301, the top of the third slider 304 is fixedly connected with a fixing frame 305, and the inside of the fixing frame 305 is fixedly connected with a stamping tube 306.

[0035] A sealing ring 307 is fixedly connected to one side of the stamping tube 306 close to the center of the operating table 1, a pressure relief valve 308 is connected to the top of the stamping tube 306, an air intake pipe 309 is connected to the stamping tube 306, a pressure monitor 310 is provided on the air intake pipe 309, and a one-way air valve 311 is provided on the air intake pipe 309.

[0036] A second motor 312 is fixedly connected to the top of the operating table 1 , a fan 313 is fixedly connected to the output end of the second motor 312 , a hose 314 is provided on the top of the fan 313 , and one end of the hose 314 away from the fan 313 is connected to the air inlet pipe 309 .

[0037] A fixing mechanism 4 is arranged above the operating platform 1, and the fixing mechanism 4 includes a mounting frame 401 fixedly connected to the top of the operating platform 1. Two mounting frames 401 are arranged, and a second slide rail 402 is fixedly connected to one side of the two mounting frames 401 close to each other, and a mounting rod 403 is slidably connected inside the second slide rail 402.

[0038] Both ends of the mounting rod 403 penetrate through the outer wall of the second slide rail 402 and extend, and both ends of the mounting rod 403 are fixedly connected to the first pull rod 404, and one end of the first pull rod 404 away from the mounting rod 403 is fixedly connected to the top of the second slider 209, and the outer wall of the mounting rod 403 is rotatably connected to the second pull rod 405, and the bottom of the second slide rail 402 is fixedly connected to the third slide rail 406.

[0039] The third slide rail 406 is slidably connected to the inside of a fourth slider 407, a push rod 408 is fixedly connected to the bottom of the fourth slider 407, one end of the push rod 408 away from the fourth slider 407 passes through the bottom of the third slide rail 406 and extends, one end of the push rod 408 away from the fourth slider 407 is fixedly connected to a pressure plate 409, the left and right sides of the fourth slider 407 are fixedly connected to a limit rod 410, and the limit rod 410 is slidably connected to the inside of the third slide rail 406.

[0040] When in use, when the first slider 205 is located at the right end of the first threaded rod 203, the stamping tube 306 on the stamping mechanism 3 will dock with the valve on the left. When the left valve is detected, the first motor 202 is started counterclockwise, and the first motor 202 drives the first threaded rod 203 to rotate. The rotation of the first threaded rod 203 will cause the first slider 205 to move to the left, and the first slider 205 drives the base 210 and the connecting rod 206 to move. The mounting plate 201 drives the valves on the placement rack 211 and the support rack 212 to move. The movement of the connecting rod 206 will drive the fixed rod 207 to move. Because the connecting plate 208 is fixedly connected to the second slider 209, and the second slider 209 is slidably connected to the inside of the second slide groove 13, the fixed rod 207 will push the connecting plate 208 moves in the direction away from the center of the operating table 1, the connecting plate 208 drives the second slider 209 to move, and the second slider 209 drives the stamping mechanism 3 to move, so that the stamping tube 306 is separated from the valve tested on the left side of the first slider 205. When the center of the first slider 205 is in the same horizontal plane as the center of the operating table 1, the first slider 205 continues to move to the left, and the connecting rod 206 pulls the fixed rod 207 to move toward the center of the operating table 1. When the first slider 205 moves to the leftmost end of the first threaded rod 203, the stamping tube 306 on the stamping mechanism 3 will dock with the valve on the right side of the first slider 205 to test the right valve. At this time, the valve tested on the left side can be taken out and a new valve can be placed. Similarly, the first motor 2 is turned clockwise. 02, the first slider 205 moves from left to right and repeats the above operation, thereby shortening the residence time of the valve on the test bench and improving the test efficiency. The knob 303 is rotated, and the rotation of the knob 303 drives the second threaded rod 302 to rotate. Because the first slide rail 301 limits the third slider 304, when the second threaded rod 302 rotates, the third slider 304 moves along the first slide rail 301, and the third slider 304 drives the fixing frame 305 to move, and the fixing frame 305 drives the stamping tube 306 to move, so that the position of the stamping tube 306 can be adjusted to adapt to the test of valves of different lengths. At the same time, when the connecting plate 208 approaches the center of the operating table 1, the second slider 209 drives the first pull rod 404 to move, and the first pull rod 406 moves. 04 drives the installation rod 403 to move, the installation rod 403 pushes the second pull rod 405, the second pull rod 405 pushes the fourth slider 407 to move downward along the third slide rail 406, the fourth slider 407 drives the push rod 408 to move downward, the push rod 408 drives the pressure plate 409 to move, so that the pressure plate 409 contacts the top of the valve, so that the valve can be fixed in the placement frame 211 and the support frame 212 to prevent the valve from shaking during the stamping test, resulting in air leakage at the docking point between the stamping tube 306 and the valve, affecting the test result. After the stamping tube 306 is docked with the valve, the second motor 312 is started, and the second motor 312 drives the fan 313 to run. The fan 313 will blow air into the stamping tube 306 through the hose 314 and the air inlet pipe 309.The air in the stamping tube 306 will be blocked by the valve. At this time, the pressure inside the stamping tube 306 and the valve will increase. The pressure on both sides of the valve can be checked through the pressure monitor 310. By blowing air of different pressures into both sides of the valve and letting it stand for a period of time, the pressure on both sides can be observed. If the low pressure increases and the high pressure decreases, it means that the valve is leaking. If both the high and low pressures decrease, there may be a leak on the sealing surface of the valve.

[0041] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A valve maintenance and inspection device utilizing pressure characteristics, comprising an operating table (1), a support column (11) being fixedly connected to the bottom of the operating table (1), a first slide groove (12) being provided on the operating table (1), and a second slide groove (13) being provided on the operating table (1), characterized in that: Also includes: A placement mechanism (2), the placement mechanism (2) comprising a mounting plate (201) fixedly connected to the top of the operating table (1), two mounting plates (201) being provided, a first motor (202) being fixedly connected to the right side of the right mounting plate (201), an output end of the first motor (202) passing through the left side of the right mounting plate (201) and extending, a first threaded rod (203) being fixedly connected to the output end of the first motor (202), an end of the first threaded rod (203) away from the first motor (202) being rotatably connected to the right side of the left mounting plate (201), a first sliding rod (204) being fixedly connected to the side where the two mounting plates (201) are close to each other, a first sliding block (205) being slidably connected to the outer wall of the first sliding block (204), an inner wall of the first sliding block (205) being threadedly connected to the outer wall of the first threaded rod (203), A connecting rod (206) is fixedly connected to the central axis at the bottom of the first sliding block (205), and the connecting rod (206) is slidably connected to the inside of the first sliding groove (12). The end of the connecting rod (206) away from the first sliding block (205) passes through the first sliding groove (12) and extends. The outer wall of the connecting rod (206) is rotatably connected to a fixing rod (207), and the end of the fixing rod (207) away from the connecting rod (206) is rotatably connected to a connecting plate (208). The left and right sides of the connecting plate (208) are fixedly connected to a second sliding block (209), and the second sliding block (209) is slidably connected to the inside of the second sliding groove (13). The top of the first sliding block (205) is fixedly connected to a base (210), and the top of the base (210) is fixedly connected to a placement frame (211), and the top of the base (210) is fixedly connected to a support frame (212); A fixing mechanism (4) is arranged above the operating table (1), and the fixing mechanism (4) comprises a mounting frame (401) fixedly connected to the top of the operating table (1), and two mounting frames (401) are arranged, and a second slide rail (402) is fixedly connected to the side of the two mounting frames (401) close to each other, and a mounting rod (403) is slidably connected inside the second slide rail (402), and both ends of the mounting rod (403) penetrate the outer wall of the second slide rail (402) and extend, and both ends of the mounting rod (403) are fixedly connected to a first pull rod (404), and one end of the first pull rod (404) away from the mounting rod (403) is fixedly connected to the top of the second slider (209), and the mounting rod The outer wall (403) is rotatably connected to a second pull rod (405), the bottom of the second slide rail (402) is fixedly connected to a third slide rail (406), the inside of the third slide rail (406) is slidably connected to a fourth slider (407), the bottom of the fourth slider (407) is fixedly connected to a push rod (408), the end of the push rod (408) away from the fourth slider (407) passes through the bottom of the third slide rail (406) and extends, the end of the push rod (408) away from the fourth slider (407) is fixedly connected to a pressure plate (409), the left and right sides of the fourth slider (407) are fixedly connected to a limit rod (410), and the limit rod (410) is slidably connected to the inside of the third slide rail (406).

2. The valve maintenance and inspection device using pressure characteristics according to claim 1, characterized in that: A punching mechanism (3) is arranged above the second sliding block (209), and the punching mechanism (3) comprises a first sliding rail (301) fixedly connected to the top of the second sliding block (209), a second threaded rod (302) being rotatably connected inside the first sliding rail (301), and an end of the second threaded rod (302) away from the center of the operating table (1) passes through the outer wall of the first sliding rail (301) and extends.

3. The valve maintenance and detection device using pressure characteristics according to claim 2, characterized in that: A knob (303) is fixedly connected to one end of the second threaded rod (302) away from the center of the operating table (1); a third slider (304) is threadedly connected to the outer wall of the second threaded rod (302); the third slider (304) is slidably connected to the inside of the first slide rail (301); a fixing frame (305) is fixedly connected to the top of the third slider (304); and a stamping tube (306) is fixedly connected to the inside of the fixing frame (305).

4. The valve maintenance and inspection device using pressure characteristics according to claim 3, characterized in that: A sealing ring (307) is fixedly connected to one side of the stamping tube (306) close to the center of the operating table (1); a pressure relief valve (308) is provided on the top of the stamping tube (306); an air intake pipe (309) is provided on the stamping tube (306); a pressure monitor (310) is provided on the air intake pipe (309); and a one-way air valve (311) is provided on the air intake pipe (309).

5. The valve maintenance and inspection device using pressure characteristics according to claim 1, characterized in that: A second motor (312) is fixedly connected to the top of the operating table (1); a fan (313) is fixedly connected to the output end of the second motor (312); a hose (314) is provided on the top of the fan (313); and one end of the hose (314) away from the fan (313) is connected to an air inlet pipe (309).

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