Heat exchange well depth detection device for ground source heat pump

Abstract

The invention discloses a heat exchange well depth detection device for a ground source heat pump, and relates to the technical field of heat exchange well depth detection, a rotating shaft is fixedly sleeved with a winding roller, a U-shaped switching frame is provided with a locking assembly used for conducting one-way locking on the rotating shaft, the winding roller is wound with a flexible pipe, and the flexible pipe is connected with the rotating shaft. The supporting frame is provided with an inflation assembly used for inflating the interior of the flexible pipe, a falling cylinder is fixed to the lower end of the flexible pipe, and an extension supporting assembly is installed between the bogie and the falling cylinder. In the process that the flexible pipe is inflated through the inflation assembly, pressure air can enter the center cylinder and be dispersed into the multiple radial pipes and the abutting and pushing cylinder, so that the abutting and pushing cylinder can push the bogie to rotate, and under the action of the extension supporting assembly, the extension frame can extend relative to the falling cylinder and abut against the inner wall of the heat exchange well; the position stability of the falling cylinder is effectively guaranteed, shaking of the falling cylinder is avoided, and the depth detection accuracy of the heat exchange well is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange well depth detection, in particular to a heat exchange well depth detection device for a ground source heat pump. Background Art

[0002] A ground-source heat pump is an efficient, energy-saving and environmentally friendly air-conditioning system that utilizes shallow underground geothermal resources for both heating and cooling. A ground-source heat pump can transfer energy from a low-temperature heat source to a high-temperature heat source by inputting a small amount of electrical energy. In winter, the heat in the soil is "extracted", the temperature is raised and then supplied to the room for heating; in summer, the heat in the room is "extracted" and released into the soil, and the underground temperature can be kept balanced all year round.

[0003] When performing depth detection on the heat exchange well of a ground source heat pump, the existing depth detection device uses a rope to drop a lead block into the heat exchange well, and measures the depth of the heat exchange well by the length of the rope. However, during the depth detection process, it is easy to cause the rope to tilt and shake. At the same time, the stability of the lead block inside the heat exchange well is poor, and it is also easy to produce a large shake, resulting in inaccurate depth detection results of the heat exchange well. In view of the above technical defects of the prior art, a heat exchange well depth detection device for a ground source heat pump is provided to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a heat exchange well depth detection device for a ground source heat pump to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A heat exchange well depth detection device for a ground source heat pump comprises a support frame, a circular hole is opened on the support frame, a rotating shaft is rotatably mounted on the support frame, a hand crank is fixed to the end of the rotating shaft, a winding roller is fixedly sleeved on the rotating shaft, a U-shaped switching frame is slidably mounted on the support frame, a locking assembly for one-way locking of the rotating shaft is installed on the U-shaped switching frame, a flexible tube is wound on the winding roller, an inflation assembly for inflating the inside of the flexible tube is installed on the support frame, the flexible tube passes through the center of the circular hole, a fixed sleeve sleeved on the flexible tube is fixed on the support frame, and the fixed sleeve A limit assembly for laterally clamping the flexible tube is installed on the tube, a sinker is fixed at the lower end of the flexible tube, an ultrasonic generator is installed on the sinker, an ultrasonic receiver corresponding to the ultrasonic generator is fixed on the edge of the circular hole, a central tube connected to the flexible tube is fixed in the sinker, a plurality of radial tubes are installed on the central tube, a push tube is sealingly and slidingly sleeved on the radial tube, a plurality of bogies corresponding to the push tubes are rotatably installed on the side wall of the sinker, a torsion spring is connected between the bogie and the sinker, and an extension support assembly is installed between the bogie and the sinker.

[0006] As an improved solution of the present invention: the limiting assembly includes a plurality of rotating frames rotatably mounted on the side wall of the fixed sleeve, and a guide wheel abutting against the side wall of the flexible tube is rotatably mounted on the lower end of the rotating frame.

[0007] As an improved solution of the present invention: the limiting assembly also includes a lifting sleeve threadedly sleeved on the fixed sleeve, the lifting sleeve is rotatably mounted with a threaded sleeve, the support frame is rotatably mounted with a rotating sleeve, the rotating sleeve is slidably sleeved on the threaded sleeve, and the lifting sleeve abuts against the rotating frame.

[0008] As an improved solution of the present invention: the side wall of the threaded sleeve is fixed with an inner wall slidably embedded in the rotating sleeve, a screwing wheel is rotatably mounted on the support frame, and a pulley mechanism is transmission-connected between the screwing wheel and the threaded sleeve.

[0009] As an improved solution of the present invention: the extension support assembly includes an extension frame slidably mounted on the bogie, a traction frame is hinged between the extension frame and the sinking tube, and the end of the push tube is provided with an inclined surface abutting against the bogie.

[0010] As an improved solution of the present invention: the extension support assembly also includes a sleeve disc fixedly sleeved on the push tube, a spring ring is fixed between the sleeve disc and the inner wall of the sinking tube, a sliding plate is fixed on the sleeve disc, and a clamping assembly for limiting the sliding plate is installed on the sinking tube.

[0011] As an improved solution of the present invention: the clamping assembly includes an extension plate fixed to the inner wall of the falling tube, a triangular plug block is vertically slidably installed on the extension plate, a thrust spring I is fixed between the triangular plug block and the extension plate, and a V-groove adapted for plugging with the triangular plug block is provided on the sliding plate.

[0012] As an improved solution of the present invention: the locking assembly includes a check plate I and a check plate II coaxially fixed on the rotating shaft, the check plate I is provided with a plurality of wedge grooves I evenly arranged in an annular direction, the check plate II is provided with a plurality of wedge grooves II evenly arranged in an annular direction, wedge teeth I and wedge blocks II are respectively slidably installed at both ends of the U-shaped switching frame, the wedge teeth I is snap-fitted with the wedge groove I, the wedge blocks II are snap-fitted with the wedge groove II, and a push spring II is fixedly connected between the wedge teeth I and the wedge blocks II and the U-shaped switching frame.

[0013] As an improved solution of the present invention: the inflation component includes an air pump fixed on a support frame, the air outlet of the air pump is connected to a valve, an air inlet pipe is installed on the valve, the air inlet pipe connected to the flexible pipe is installed in the rotating shaft and the winding roller, the part of the air inlet pipe located in the rotating shaft is coaxially arranged with the rotating shaft, and the air inlet pipe is connected to the air inlet pipe through a rotating joint.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention can provide lateral support for the flexible tube by means of the limit assembly, so that the flexible tube can extend into the heat exchange well along the vertical direction, and the downward transportation of the flexible tube is smoother. By injecting air into the flexible tube, the flexible tube can be straightened during transportation, which can effectively reduce the shaking of the flexible tube, effectively improve the depth detection stability of the heat exchange well, and effectively improve the depth detection accuracy.

[0015] The present invention uses the inflation component to inflate the flexible tube, so that pressurized air can enter the center tube and disperse into multiple radial tubes and the push tube, so that the push tube can push the bogie to rotate. Under the action of the extension support component, the extension frame can extend relative to the falling tube and abut against the inner wall of the heat exchange well, which effectively ensures the stability of the position of the falling tube and avoids its shaking, thereby significantly improving the accuracy of depth detection of the heat exchange well. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 For the present invention Figure 1 The enlarged schematic diagram of the middle A part; Figure 3 For the present invention Figure 1 A schematic diagram of the structure at a certain viewing angle; Figure 4It is a schematic diagram of the connection of the winding roller, the rotating shaft, the air inlet pipe and the flexible pipe in the present invention; Figure 5 It is a connection diagram of the rotating shaft, the U-shaped switching frame and the locking assembly in the present invention; Figure 6 It is a schematic diagram of the connection between the wedge tooth I, the wedge block II, the push spring II and the U-shaped switching frame in the present invention; Figure 7 It is a structural schematic diagram of the limiting component in the present invention; Figure 8 It is a schematic diagram of the local structure of the present invention; Fig. 9 It is a schematic diagram of the connection between the bogie, the thrust cylinder and the extension support assembly in the present invention; Fig.10 It is a schematic diagram of the connection of the push cylinder, sleeve disc, sliding plate and other components in the present invention.

[0017] In the figure: 1-support frame, 2-round hole, 3-winding roller, 4-air pump, 5-valve, 6-intake pipe, 7-flexible pipe, 8-falling cylinder, 9-ultrasonic generator, 10-ultrasonic receiver, 11-guide wheel, 12-lifting sleeve, 13-hand crank, 14-twist wheel, 15-pulley mechanism, 16-extension frame, 17-bend pipe, 18-check plate I, 19-wedge tooth I, 20-check plate II, 21-rotating shaft, 22-U-shaped switching frame, 23-thrust spring I, 2 4-rotating joint, 25-rotating frame, 26-triangular plug, 27-wedge groove I, 28-wedge block II, 29-wedge groove II, 30-rotating sleeve, 31-clip strip, 32-threaded sleeve, 33-thrust spring II, 34-fixed sleeve, 35-center tube, 36-sliding plate, 37-thrust tube, 38-bogie, 39-traction frame, 40-extension plate, 41-inclined surface, 42-spring ring, 43-sleeve disc, 44-radial tube, 45-V groove, 46-torsion spring. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments: First embodiment: Please refer to the attached Figure 1 -Attached Fig.10A heat exchange well depth detection device for a ground source heat pump comprises a support frame 1, a circular hole 2 is opened on the support frame 1, a rotating shaft 21 is rotatably installed on the support frame 1, a hand crank 13 is fixed to the end of the rotating shaft 21, a winding roller 3 is fixedly sleeved on the rotating shaft 21, a U-shaped switching frame 22 is slidably installed on the support frame 1, a locking component for one-way locking of the rotating shaft 21 is installed on the U-shaped switching frame 22, a flexible tube 7 is wound on the winding roller 3, an inflation component for inflating the inside of the flexible tube 7 is installed on the support frame 1, the flexible tube 7 passes through the center of the circular hole 2, a fixed sleeve 34 sleeved on the flexible tube 7 is fixed on the support frame 1, and a fixed sleeve 34 is fixed on the fixed sleeve 34 A limit assembly for laterally clamping the flexible tube 7 is installed, a drop tube 8 is fixed at the lower end of the flexible tube 7, an ultrasonic generator 9 is installed on the drop tube 8, an ultrasonic receiver 10 corresponding to the ultrasonic generator 9 is fixed on the edge of the circular hole 2, a central tube 35 connected to the flexible tube 7 is fixed in the drop tube 8, a plurality of radial tubes 44 are installed on the central tube 35, a push tube 37 is sealingly and slidingly sleeved on the radial tube 44, a plurality of bogies 38 corresponding to the push tubes 37 are rotatably installed on the side wall of the drop tube 8, a torsion spring 46 is connected between the bogie 38 and the drop tube 8, and an extension support assembly is installed between the bogie 38 and the drop tube 8.

[0019] When the depth of the heat exchange well of the ground source heat pump is detected by using this device, the circular hole 2 is placed opposite to the wellhead of the heat exchange well, and the rotating shaft 21 is driven to rotate by shaking the hand crank 13. The rotating shaft 21 drives the winding roller 3 to rotate to release the flexible pipe 7 wound thereon, so that the drop tube 8 enters the heat exchange well under the traction of the flexible pipe 7, the ultrasonic generator 9 emits ultrasonic waves, and the ultrasonic receiver 10 receives the ultrasonic signal. The ultrasonic signal is analyzed by an external processor electrically connected to the ultrasonic receiver 10 to obtain the depth of the heat exchange well.

[0020] The position limiting assembly of the device includes a plurality of rotating frames 25 rotatably mounted on the side wall of the fixed sleeve 34, and a guide wheel 11 abutting against the side wall of the flexible tube 7 is rotatably mounted on the lower end of the rotating frame 25. The position limiting assembly also includes a lifting sleeve 12 threadedly sleeved on the fixed sleeve 34, and a threaded sleeve 32 is rotatably mounted on the lifting sleeve 12. A rotating sleeve 30 is rotatably mounted on the support frame 1, and the rotating sleeve 30 is slidably sleeved on the threaded sleeve 32, and the lifting sleeve 12 abuts against the rotating frame 25. A clamping strip 31 slidably embedded in the inner wall of the rotating sleeve 30 is fixed to the side wall of the threaded sleeve 32, and a screwing wheel 14 is rotatably mounted on the support frame 1, and a pulley mechanism 15 is transmission-connected between the screwing wheel 14 and the threaded sleeve 32.

[0021] Through the above arrangement, the selected screw wheel 14 can drive the rotating sleeve 30 to rotate through the pulley mechanism 15, and the rotating sleeve 30 drives the threaded sleeve 32 to rotate through the clamping strip 31. The threaded sleeve 32 drives the lifting sleeve 12 to move vertically downward under the action of the thread of the fixed sleeve 34. At this time, the lifting sleeve 12 pushes the rotating frame 25, and the multiple rotating frames 25 respectively drive the guide wheels 11 thereon to move toward the flexible tube 7, so that the guide wheel 11 abuts against the flexible tube 7 inflated inside, which plays a role in limiting and guiding the flexible tube 7 during the downward movement, ensuring that the flexible tube 7 and the falling tube 8 move downward stably.

[0022] In addition, the extension support assembly includes an extension frame 16 slidably mounted on the bogie 38, a traction frame 39 is hinged between the extension frame 16 and the sinking tube 8, and an inclined surface 41 is provided at the end of the push tube 37 to abut against the bogie 38. The extension support assembly also includes a sleeve 43 fixedly sleeved on the push tube 37, a spring ring 42 is fixed between the sleeve 43 and the inner wall of the sinking tube 8, a sliding plate 36 is fixed on the sleeve 43, and a clamping assembly for limiting the sliding plate 36 is installed on the sinking tube 8.

[0023] Specifically, the clamping assembly includes an extension plate 40 fixed to the inner wall of the falling tube 8, a triangular plug block 26 is vertically slidably installed on the extension plate 40, a push spring I23 is fixed between the triangular plug block 26 and the extension plate 40, and a V-groove 45 is provided on the sliding plate 36 to be plugged in and adapted to the triangular plug block 26.

[0024] Based on the above arrangement, during the process of the inflation component filling the flexible tube 7 with air, the air enters the center tube 35 and then disperses into each radial tube 44. After the flexible tube 7 is filled with air and the internal air pressure reaches a certain value, the air pushes the push tube 37 to slide relative to the radial tube 44, and the sliding plate 36 slides relative to the triangular plug block 26, that is, the triangular plug block 26 is not engaged with the V-groove 45. Before the push tube 37 slides relative to the radial tube 44, the triangular plug block 26 is stably engaged in the V-groove 45 under the pushing action of the push spring 123, thereby achieving a temporary stable locking effect on the push tube 37, ensuring that the bogie 38 will not rotate until the flexible tube 7 is filled with air, thereby avoiding the bogie 38 from rotating too early and abutting against the inner wall of the heat exchange well, thereby ensuring that the falling tube 8 moves down smoothly into the heat exchange well.

[0025] During the sliding of the push tube 37 relative to the radial tube 44, the push tube 37 pushes the bogie 38 to rotate, thereby expanding the distance between the end of the bogie 38 and the drop tube 8. At the same time, under the traction of the traction frame 39, the extension frame 16 rotates with the bogie 38 while sliding relative to the bogie 38, further increasing the distance between the extension frame 16 and the drop tube 8, ensuring that the extension frame 16 can stably abut against the inner wall of the heat exchange well and quickly and stably position the drop tube 8, effectively ensuring the stability and accuracy of the heat exchange well depth detection.

[0026] Second embodiment: Please refer to the attached Figure 1 -Attached Fig.10 On the basis of the first embodiment, in addition, the locking assembly includes a check plate I18 and a check plate II20 coaxially fixed on the rotating shaft 21, a plurality of wedge grooves I27 are evenly arranged on the check plate I18 in an annular direction, a plurality of wedge grooves II29 are evenly arranged on the check plate II20 in an annular direction, wedge teeth I19 and wedge blocks II28 are slidably installed at both ends of the U-shaped switching frame 22, the wedge surfaces of the wedge teeth I19 and the wedge blocks II28 face opposite directions, the wedge teeth I19 are snap-fitted with the wedge grooves I27, the wedge blocks II28 are snap-fitted with the wedge grooves II29, and a push spring II33 is fixedly connected between the wedge teeth I19 and the wedge blocks II28 and the U-shaped switching frame 22.

[0027] Through the structural setting of the above-mentioned locking assembly, when the winding roller 3 lays out the flexible tube 7, the wedge tooth I19 is switched to be engaged with the wedge groove I27 by sliding the U-shaped switching frame 22. At this time, the wedge block II28 and the wedge groove II29 are in a separated state. At this time, the winding roller 3 can only rotate clockwise to lay out the flexible tube 7, and the winding roller 3 cannot rotate in the opposite direction, which ensures that the flexible tube 7 drives the falling tube 8 to move downward stably. When the flexible tube 7 needs to be reeled in, the wedge block II28 is switched to be engaged with the wedge groove II29 by sliding the U-shaped switching frame 22. At this time, the wedge tooth I19 and the wedge groove I27 are in a separated state, that is, the winding roller 3 can only rotate counterclockwise to reel in the flexible tube 7, which ensures that the flexible tube 7 can be stably wound around the winding roller 3. The above-mentioned switching operation is simple and convenient, which greatly ensures the stability of the laying and reeling in of the flexible tube 7.

[0028] The inflation component of the device includes an air pump 4 fixed on the support frame 1, the air outlet of the air pump 4 is connected to a valve 5, an air inlet pipe 6 is installed on the valve 5, the air inlet pipe 6 connected to the flexible tube 7 is installed in the rotating shaft 21 and the winding roller 3, the part of the air inlet pipe 6 located in the rotating shaft 21 is coaxially arranged with the rotating shaft 21, and the air inlet pipe 6 is connected to the air inlet pipe 6 through a rotating joint 24.

[0029] Through the above-mentioned arrangement, the compressed air generated by the air pump 4 can enter the curved pipe 17 through the air inlet pipe 6, thereby achieving the inflation effect on the flexible pipe 7, ensuring that the flexible pipe 7 entering the heat exchange well is in a straight state due to the compressed air inside, which overcomes the defects of the existing rope that is easy to shake and twist, effectively improves the stability of the downward movement of the falling tube 8, and improves the accuracy of the depth detection of the heat exchange well.

[0030] In summary, the present invention can provide lateral support to the flexible tube 7 by setting the limit assembly, so that the flexible tube 7 can extend to the inside of the heat exchange well in the vertical direction, and the downward transportation of the flexible tube 7 is more stable. By injecting air into the flexible tube 7, the flexible tube 7 can be straightened during the transportation process, which can effectively reduce the shaking of the flexible tube 7, effectively improve the stability of the depth detection of the heat exchange well, and effectively improve the accuracy of the depth detection. In the process of inflating the flexible tube 7 by the inflation assembly of the present invention, the pressurized air can enter the center tube 35 and disperse into the multiple radial tubes 44 and the push tube 37, so that the push tube 37 can push the bogie 38 to rotate. Under the action of the extension support assembly, the extension frame 16 can extend relative to the falling tube 8 and abut against the inner wall of the heat exchange well, effectively ensuring the stability of the position of the falling tube 8 and avoiding its shaking, so that the accuracy of the depth detection of the heat exchange well is significantly improved.

Claims

1. A heat exchange well depth detection device for a ground source heat pump, comprising a support frame (1), a circular hole (2) is formed on the support frame (1), a rotating shaft (21) is rotatably mounted on the support frame (1), a hand crank (13) is fixed to the end of the rotating shaft (21), a winding roller (3) is fixedly sleeved on the rotating shaft (21), characterized in that: A U-shaped switching frame (22) is slidably mounted on the support frame (1), a locking assembly for unidirectionally locking the rotating shaft (21) is mounted on the U-shaped switching frame (22), a flexible tube (7) is wound on the winding roller (3), an inflation assembly for inflating the inside of the flexible tube (7) is mounted on the support frame (1), the flexible tube (7) passes through the center of the circular hole (2), a fixed sleeve (34) sleeved on the flexible tube (7) is fixed on the support frame (1), a limiting assembly for lateral clamping of the flexible tube (7) is mounted on the fixed sleeve (34), a sinker (8) is fixed at the lower end of the flexible tube (7), and the sinker (8) is fixed at the lower end of the flexible tube (7). An ultrasonic generator (9) is installed on the upper surface of the cylindrical tube (8), an ultrasonic receiver (10) corresponding to the ultrasonic generator (9) is fixed on the edge of the circular hole (2), a central tube (35) connected to the flexible tube (7) is fixed in the lower sinking tube (8), a plurality of radial tubes (44) are installed on the central tube (35), a push tube (37) is sealingly and slidably sleeved on the radial tube (44), a plurality of bogies (38) corresponding to the push tubes (37) are rotatably installed on the side wall of the lower sinking tube (8), a torsion spring (46) is connected between the bogie (38) and the lower sinking tube (8), and an extension support assembly is installed between the bogie (38) and the lower sinking tube (8).

2. A heat exchange well depth detection device for a ground source heat pump according to claim 1, characterized in that: The limiting assembly comprises a plurality of rotating frames (25) rotatably mounted on the side wall of the fixed sleeve (34), and a guide wheel (11) is rotatably mounted on the lower end of the rotating frame (25) and abuts against the side wall of the flexible tube (7).

3. A heat exchange well depth detection device for a ground source heat pump according to claim 2, characterized in that: The limiting assembly further comprises a lifting sleeve (12) threadedly sleeved on the fixed sleeve (34), a threaded sleeve (32) being rotatably mounted on the lifting sleeve (12), a rotating sleeve (30) being rotatably mounted on the support frame (1), the rotating sleeve (30) being slidably sleeved on the threaded sleeve (32), and the lifting sleeve (12) being in abutment with the rotating frame (25).

4. A heat exchange well depth detection device for a ground source heat pump according to claim 3, characterized in that: A clamping strip (31) slidably embedded in the inner wall of the rotating sleeve (30) is fixed to the side wall of the threaded sleeve (32), a screwing wheel (14) is rotatably mounted on the support frame (1), and a pulley mechanism (15) is transmission-connected between the screwing wheel (14) and the threaded sleeve (32).

5. The heat exchange well depth detection device for a ground source heat pump according to claim 1, characterized in that: The extension support assembly comprises an extension frame (16) slidably mounted on the bogie (38), a traction frame (39) is hingedly connected between the extension frame (16) and the sinker tube (8), and an end of the push tube (37) is provided with an inclined surface (41) that abuts against the bogie (38).

6. A heat exchange well depth detection device for a ground source heat pump according to claim 5, characterized in that: The extension support assembly further comprises a sleeve disc (43) fixedly sleeved on the push tube (37), a spring ring (42) being fixed between the sleeve disc (43) and the inner wall of the sinker tube (8), a sliding plate (36) being fixed on the sleeve disc (43), and a clamping assembly for limiting the position of the sliding plate (36) being installed on the sinker tube (8).

7. A heat exchange well depth detection device for a ground source heat pump according to claim 6, characterized in that: The clamping assembly comprises an extension plate (40) fixed to the inner wall of the falling tube (8), a triangular plug block (26) being vertically slidably mounted on the extension plate (40), a push spring I (23) being fixed between the triangular plug block (26) and the extension plate (40), and a V-groove (45) being plug-fitted with the triangular plug block (26) being provided on the sliding plate (36).

8. The heat exchange well depth detection device for a ground source heat pump according to claim 1, characterized in that: The locking assembly comprises a check plate I (18) and a check plate II (20) coaxially fixed on the rotating shaft (21); a plurality of wedge grooves I (27) are uniformly formed on the check plate I (18) in an annular direction; a plurality of wedge grooves II (29) are uniformly formed on the check plate II (20) in an annular direction; wedge teeth I (19) and wedge blocks II (28) are slidably mounted on both ends of the U-shaped switching frame (22); the wedge teeth I (19) are snap-fitted with the wedge grooves I (27); the wedge blocks II (28) are snap-fitted with the wedge grooves II (29); and push springs II (33) are fixedly connected between the wedge teeth I (19) and the wedge blocks II (28) and the U-shaped switching frame (22).

9. The heat exchange well depth detection device for a ground source heat pump according to claim 1, characterized in that: The inflation assembly comprises an air pump (4) fixed on a support frame (1); an air outlet of the air pump (4) is connected to a valve (5); an air inlet pipe (6) is mounted on the valve (5); an air inlet pipe (6) connected to a flexible pipe (7) is mounted inside the rotating shaft (21) and the winding roller (3); a portion of the air inlet pipe (6) located inside the rotating shaft (21) is coaxially arranged with the rotating shaft (21); and the air inlet pipe (6) is connected to the air inlet pipe (6) via a rotating joint (24).

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