Explosion-proof inspection robot

Abstract

The utility model relates to the technical field of inspection holders, and discloses an anti-explosion inspection robot which comprises a holder body, a sound sensor and a gas sensor, the outer walls of the ends, away from the holder body, of the sound sensor and the gas sensor are sleeved with and fixedly connected with frames, and the sides, away from the holder body, of the two frames are provided with adjusting openings. The inner walls of the two adjusting openings are connected with dustproof assemblies, and the total height of the two dustproof assemblies does not exceed 2 / 3 of the inner wall of the frame. According to the anti-explosion inspection robot, when the inspection robot executes an inspection task in some places with large dust, transposition can be conducted at regular time through the dustproof assembly, air blowing is conducted from the back face of the dustproof assembly through the air blowing mechanism at the same time, and then dust, batting and the like adhering to the dustproof assembly can be blown off; and therefore, the normal monitoring of the sound sensor and the gas sensor can be prevented from being influenced by excessive dust and batting, and the time for manual cleaning can be saved.

Description

Technical Field

[0001] The utility model relates to the technical field of inspection pan - tilt, in particular to an explosion - proof inspection robot. Background Art

[0002] An explosion - proof inspection robot is a robot specially designed for automatic or remote inspection and monitoring in potentially explosive environments. As one of the important components of an explosion - proof inspection robot, the inspection pan - tilt is a rotatable and tiltable platform installed on the top of the robot, on which a variety of visual and sensing devices are loaded, such as high - definition cameras, thermal imagers, lidars, millimeter - wave radars, ultrasonic radars, gas monitoring sensors, sound sensors, etc.

[0003] Currently, the patent with the publication number CN214110427U discloses an explosion - proof inspection robot, including a robot body. A detection platform is installed on the robot body. A support rod is fixedly connected to the upper end of the detection platform. A baffle is fixedly connected to the support rod. A storage groove is provided on the robot body. A rectangular frame is slidably connected in the storage groove. The rectangular frame abuts against the baffle. A limiting mechanism is provided between the rectangular frame and the upper end of the robot body. Four mounting frames are installed at the bottom of the robot body, and walking wheels are installed on all four mounting frames. The structure of this robot is reasonable. It can not only control the pan - tilt, high - definition camera and infrared thermal imager, making them not easily damaged and convenient for reuse, but also has a shock - absorbing effect, realizing the protection of electrical components inside the robot body, and also facilitating the disassembly and repair of the high - definition camera and infrared thermal imager.

[0004] However, the above - mentioned explosion - proof inspection robot still has the following problems during actual use:

[0005] Most explosion - proof inspection robots are applied to natural gas facilities, chemical plants, mines and other industrial sites with flammable or explosive gases, vapors, and dust. In these places, the air mostly contains a certain amount of dust and flying flocs. These dust and flying flocs are very likely to adhere to the dust - proof net outside the gas monitoring sensor or sound sensor of the explosion - proof inspection robot. Over time, the accumulated dust and flying flocs will block the dust - proof net, thereby affecting the normal transmission of gas and sound, and may also affect the quality of the collected data. Currently, the cleaning of the dust - proof net is mostly carried out manually by disassembling after the explosion - proof inspection robot has inspected for a period of time or after the inspection is completed. This method is not only troublesome to operate but also has very low efficiency. Content of the Utility Model

[0006] Aiming at the deficiencies of the prior art, the utility model provides an explosion - proof inspection robot to solve the problem that too much dust or flying flocs adhere to the surfaces of the sound sensor and gas sensor of the current explosion - proof inspection robot, thus affecting the normal monitoring task.

[0007] The utility model provides the following technical solution: an explosion-proof inspection robot, which includes a pan-tilt body, a sound sensor and a gas sensor installed on the pan-tilt body. The outer walls of the ends of the sound sensor and the gas sensor away from the pan-tilt body are both sleeved and fixedly connected with frames. Adjustment openings are provided on the sides of the two frames away from the pan-tilt body. Dust-proof components are connected to the inner walls of the two adjustment openings. The total height of the two dust-proof components does not exceed 2 / 3 of the inner wall of the frame. Connecting openings are respectively penetrated through the upper and lower ends of the two adjustment openings close to the pan-tilt body. The upper and lower ends of the two frames close to the pan-tilt body are fixedly connected with blowing frames. The two blowing frames are respectively aligned and communicated with the two connecting openings. A blowing mechanism is connected to the side of the pan-tilt body close to the sound sensor. The output end of the blowing mechanism is connected with four flow-dividing components, and the four flow-dividing components are respectively connected with the four blowing frames.

[0008] Further, sliding grooves are provided on both sides of the two adjustment openings, and the dust-proof components are located in the two sliding grooves.

[0009] Further, the dust-proof component includes a lifting mechanism, a sliding frame and two dust-proof nets. The lifting mechanism is connected to both sides of the sliding frame, and the lifting mechanism is located in the two sliding grooves. The two dust-proof nets are both fixedly connected to the inner wall of the sliding frame, and the outer wall of the sliding frame is slidably connected to the inner wall of the adjustment opening.

[0010] Further, the lifting mechanism includes a commutation motor, a lead screw and a slide bar. The outer wall of the commutation motor is fixedly connected to the upper surface of the outer wall of the frame. The output shaft of the commutation motor is fixedly connected to one end of the lead screw. The other end of the lead screw penetrates through the frame, one side of the sliding frame and one of the sliding grooves, and is threadedly connected to the inner wall of the sliding frame. The outer wall of the lead screw is rotatably connected to the inner wall of the frame. The slide bar penetrates through the other side of the sliding frame and is slidably connected to the inner wall of the sliding frame, and both ends of the slide bar are fixedly connected to the inner wall of the other sliding groove.

[0011] Further, the upper and lower ends of the side of the frame away from the pan-tilt body are both connected with support frames. Filter cloths are fixedly connected to the inner walls of the two support frames. The two filter cloths are respectively matched and aligned with the two connecting openings. The length and width of the support frames are not less than the length and width of the dust-proof nets, and the side of the support frame close to the dust-proof net abuts against the side of the sliding frame away from the pan-tilt body.

[0012] Further, mounting blocks are fixedly connected to both sides of the support frame, and the two mounting blocks are both fastened to the frame by bolts.

[0013] Further, a partition board is fixedly connected to the middle of the side of the sliding frame away from the pan-tilt body, and the partition board is located between the two support frames.

[0014] Further, a support opening is provided on the side of the pan-tilt body close to the sound sensor, and the blowing mechanism is located in the support opening.

[0015] Furthermore, the air blowing mechanism includes an air blowing pump, a multi-way pipe, and four solenoid valves. The outer wall of the air blowing pump is fixedly connected to the inner wall of the support port. The output end of the air blowing pump is fixedly connected to one end of the multi-way pipe. The other ends of the multi-way pipe are respectively connected to four shunt components, and the four solenoid valves are respectively located inside the other ends of the multi-way pipe.

[0016] Furthermore, the shunt component includes a connecting pipe and a blowing pipe. One end of the connecting pipe is fixedly connected to the inner wall of the multi-way pipe. The other end of the connecting pipe penetrates through the air blowing frame and is fixedly connected to one end of the blowing pipe. The blowing pipe is located inside the air blowing frame, and several blowing ports of the blowing pipe are all aligned with the connecting port.

[0017] Compared with the prior art, the present utility model has the following beneficial effects:

[0018] For this kind of explosion-proof inspection robot, by arranging two frames on the sound sensor and the gas sensor of the inspection robot pan-tilt body, and arranging a dust-proof component inside the two frames, and connecting the air blowing mechanism to the four air blowing frames on the back of the two frames. When the inspection robot performs inspection tasks in some places with large dust, the dust-proof component can be regularly replaced, and at the same time, the air blowing mechanism can blow air from the back of the dust-proof component, so as to blow off the dust, fluff, etc. adhering to the dust-proof component, thereby avoiding excessive dust and fluff from affecting the normal monitoring of the sound sensor and the gas sensor, and also saving the time for manual cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall appearance of the present utility model;

[0020] Figure 2 is a detailed connection schematic diagram of components such as the pan-tilt body, sound sensor, and gas sensor of the present utility model;

[0021] Figure 3 is a detailed connection schematic diagram of components such as the frame, air blowing frame, and dust-proof net of the present utility model;

[0022] Figure 4 is the present utility model Figure 3 a schematic diagram of another perspective of each component in;

[0023] Figure 5 is an exploded schematic diagram of each component on the side of the frame of the present utility model close to the pan-tilt body;

[0024] Figure 6 is the present utility model Figure 5 an enlarged schematic diagram of part A in;

[0025] Figure 7 is the present utility model Figure 5Schematic diagram of another perspective of each component in

[0026] Figure 8 This utility model Figure 7 Enlarged schematic diagram of part B in

[0027] Figure 9 Exploded view of each component on the side of the frame of this utility model away from the pan-tilt body

[0028] Figure 10 This utility model Figure 9 Enlarged schematic diagram of part C in

[0029] Figure 11 This utility model Figure 9 Schematic diagram of another perspective of each component in

[0030] In the figure: 1, pan-tilt body; 2, frame; 3, filter cloth; 4, dust-proof net; 5, sound sensor; 6, gas sensor; 7, blowing frame; 8, support frame; 9, transposition motor; 10, mounting block; 11, blowing pump; 12, multi-way pipe; 13, connecting pipe; 14, blowing pipe; 15, solenoid valve; 16, sliding frame; 17, partition; 18, lead screw; 19, sliding rod; 101, support port; 201, connection port; 202, chute; 203, adjustment port. Specific embodiments

[0031] Next, the technical solutions in the embodiments of this utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, rather than all of the embodiments.

[0032] Please refer to Figures 1-11 , an explosion-proof inspection robot, including a pan-tilt body 1, a sound sensor 5 and a gas sensor 6 installed on the pan-tilt body 1. The outer walls of the ends of the sound sensor 5 and the gas sensor 6 away from the pan-tilt body 1 are both sleeved and fixedly connected with a frame 2. Adjustment ports 203 are provided on the sides of the two frames 2 away from the pan-tilt body 1. Dust-proof components are connected to the inner walls of the two adjustment ports 203. The total height of the two dust-proof components does not exceed 2 / 3 of the inner wall of the frame 2. Connection ports 201 are penetrated and provided at the upper and lower ends of the two adjustment ports 203 close to the pan-tilt body 1. Blowing frames 7 are fixedly connected to the upper and lower ends of the two frames 2 close to the pan-tilt body 1. The two blowing frames 7 are respectively aligned and communicated with the two connection ports 201. A blowing mechanism is connected to the side of the pan-tilt body 1 close to the sound sensor 5. The output end of the blowing mechanism is connected with four flow splitting components, and the four flow splitting components are respectively connected with the four blowing frames 7.

[0033] An explosion-proof inspection robot in the present utility model is similar in structure to the existing explosion-proof inspection robots, such as an explosion-proof inspection robot disclosed in the patent with the publication number CN217765045U. As Figures 1 to 11 shown, when the explosion-proof inspection robot in the present utility model is in use, first, two frames 2 are respectively installed outside the sound sensor 5 and the gas sensor 6, and then the inspection robot is normally operated for inspection. When the inspection robot performs inspection tasks in some places with a large amount of dust, dust or fluff in the external environment will inevitably adhere to the surfaces of the two dust-proof components. At this time, the dust-proof components can be turned on through the internal controller of the inspection robot (this is prior art, so no detailed description is given), the dust-proof components are regularly repositioned, and at the same time, the blowing mechanism is turned on through the internal controller of the inspection robot. After the blowing mechanism is started, air can be blown from the back of the dust-proof components, and thus the dust, fluff, etc. adhering to the front surface of the dust-proof components can be blown off, thereby avoiding excessive dust and fluff from affecting the normal monitoring of the sound sensor 5 and the gas sensor 6, and also saving the time for manual cleaning.

[0034] As a preferred solution of the present utility model, sliding grooves 202 are provided on both sides of the two adjustment openings 203, and the dust-proof components are located in the two sliding grooves 202.

[0035] More specifically, by providing the sliding grooves 202, first, a support can be provided for the dust-proof components; secondly, by setting the two ends of the dust-proof components in the sliding grooves 202, a partition and sealing effect can also be achieved. Finally, it is relatively aesthetically pleasing in appearance.

[0036] As a preferred solution of the present utility model, the dust-proof components include a lifting mechanism, a sliding frame 16 and two dust-proof nets 4. The lifting mechanism is connected to both sides of the sliding frame 16, and the lifting mechanism is located in the two sliding grooves 202. Both dust-proof nets 4 are fixedly connected to the inner wall of the sliding frame 16, and the outer wall of the sliding frame 16 is slidably connected to the inner wall of the adjustment opening 203.

[0037] More specifically, under normal circumstances, one of the dust-proof nets 4 is located at the position facing the opening of the sound sensor 5 (or the gas sensor 6), and thus, on the premise of separating dust, fluff, etc. in the external environment, it will not affect the normal monitoring of the sound sensor 5 (or the gas sensor 6).

[0038] After the inspection robot has been used for a period of time, a certain amount of dust or flying fluff adheres to the surface of the dust-proof net 4 facing the sound sensor 5 (or the gas sensor 6). At this time, the lifting mechanism is turned on through the internal controller of the inspection robot. After the lifting mechanism is started, it drives the sliding frame 16 to rise and fall, and thus the other dust-proof net 4 on the sliding frame 16 can be raised or lowered to the position aligned with the sound sensor 5 (or the gas sensor 6).

[0039] Meanwhile, the dust-proof net 4 with dust and flying fluffs adhered to its surface before will rise or fall to a position aligned with the connection port 201 and the blowing frame 7. At this time, the internal controller turns on the blowing mechanism, and then air can be blown from the back of this dust-proof net 4, so that the dust and flying fluffs adhered to the surface of this dust-proof net 4 can be blown off.

[0040] As a preferred solution of the present utility model, the lifting mechanism includes a transposition motor 9, a lead screw 18 and a slide bar 19. The outer wall of the transposition motor 9 is fixedly connected to the upper surface of the outer wall of the frame 2. The output shaft of the transposition motor 9 is fixedly connected to one end of the lead screw 18. The other end of the lead screw 18 penetrates through one side of the frame 2, the sliding frame 16 and one of the sliding grooves 202, and is threadedly connected to the inner wall of the sliding frame 16. The outer wall of the lead screw 18 is rotatably connected to the inner wall of the frame 2. The slide bar 19 penetrates through the other side of the sliding frame 16 and is slidably connected to the inner wall of the sliding frame 16, and both ends of the slide bar 19 are fixedly connected to the inner wall of the other sliding groove 202.

[0041] More specifically, when it is necessary to control the sliding frame 16 to transpose, just turn on the transposition motor 9 through the internal controller of the inspection robot. After the transposition motor 9 starts, the output shaft drives the lead screw 18 to rotate, and then it can cooperate with the slide bar 19 at the other end to lift or lower the middle sliding frame 16.

[0042] It should be particularly noted here that:

[0043] 1. When it is necessary to control the sliding frame 16 to transpose again, just turn on the reverse rotation of the transposition motor 9 through the internal controller.

[0044] 2. The transposition motor 9 can be pre-set to drive the lifting distance of the sliding frame 16, so that during the start-up to shutdown of the transposition motor 9, the sliding frame 16 can just transpose the two dust-proof nets 4.

[0045] As a preferred solution of the present utility model, both the upper and lower ends of the side of the frame 2 away from the pan-tilt body 1 are connected with support frames 8. Filter cloths 3 are fixedly connected to the inner walls of the two support frames 8. The two filter cloths 3 are respectively matched and aligned with the two connection ports 201, and the length and width of the support frame 8 are not less than the length and width of the dust-proof net 4, and the side of the support frame 8 close to the dust-proof net 4 abuts against the side of the sliding frame 16 away from the pan-tilt body 1.

[0046] More specifically, by providing the support frames 8 and the filter cloths 3, firstly, it can prevent the dust and flying fluffs blown off by the blowing mechanism from falling again and adhering to the lower dust-proof net 4; secondly, it can collect the blown-off dust and flying fluffs. After the current inspection task is completed, the support frames 8 and the filter cloths 3 can be disassembled to process the collected dust and flying fluffs.

[0047] It should be particularly noted here that:

[0048] 1. The filter cloth 3 can be made of a cloth with very small pore size, which is sufficient to allow the gas blown by the blowing mechanism to pass through, but dust and flying flocs will be blocked.

[0049] 2. A layer of double-sided adhesive cloth can be further arranged inside the support frame 8, and micropores with a certain pore size are opened on its surface for the wind blown by the blowing mechanism to pass through. In this way, not only can dust and flying flocs be adhered to its surface, but normal ventilation will not be affected.

[0050] 3. Since the support frame 8 and the filter cloth 3 are provided, external dust and flying flocs can also be prevented from falling into the blowing frame 7.

[0051] As a preferred solution of the present utility model, mounting blocks 10 are fixedly connected to both sides of the support frame 8, and both mounting blocks 10 are tightly connected to the frame 2 through bolts.

[0052] More specifically, by providing the mounting blocks 10 and connecting them through bolts, the installation and disassembly of the support frame 8 can be facilitated.

[0053] As a preferred solution of the present utility model, a partition 17 is fixedly connected to the middle of the side of the sliding frame 16 away from the pan-tilt body 1, and the partition 17 is located between the two support frames 8.

[0054] More specifically, by providing the partition 17, firstly, the rising and falling distance (range) of the sliding frame 16 can be limited, and secondly, the partition between the sliding frame 16 and the two support frames 8 can be increased, avoiding dust and flying flocs in the cavity between the support frame 8 and the blowing frame 7 from flying to the outside through the gap between the sliding frame 16 and the support frame 8.

[0055] As a preferred solution of the present utility model, a support opening 101 is provided on the side of the pan-tilt body 1 close to the sound sensor 5, and the blowing mechanism is located in the support opening 101.

[0056] More specifically, by providing the support opening 101, firstly, a housing can be provided for the blowing mechanism; secondly, the occupation of external space by the blowing mechanism can be avoided.

[0057] As a preferred solution of the present utility model, the blowing mechanism includes a blowing pump 11, a multi-pass pipe 12 and four solenoid valves 15. The outer wall of the blowing pump 11 is fixedly connected to the inner wall of the support opening 101, the output end of the blowing pump 11 is fixedly connected to one end of the multi-pass pipe 12, the other several ends of the multi-pass pipe 12 are respectively connected to four shunt components, and the four solenoid valves 15 are respectively located in the other several ends of the multi-pass pipe 12.

[0058] More specifically, when it is necessary to blow air from the back of the dust-proof net 4, just turn on the air blowing pump 11 through the internal controller of the inspection robot. After the air blowing pump 11 starts, its output end conveys gas (which can be air or any other harmless gas) into the multi-way pipe 12. Then, one or more of the four electromagnetic valves 15 corresponding to the electromagnetic valves 15 are opened, and thus the gas inside the multi-way pipe 12 can be conveyed into the shunt assembly, and then air can be blown from the back of the dust-proof net 4.

[0059] As a preferred solution of the present utility model, the shunt assembly includes a connecting pipe 13 and a blowing pipe 14. One end of the connecting pipe 13 is fixedly connected to the inner wall of the multi-way pipe 12, and the other end of the connecting pipe 13 penetrates through the blowing frame 7 and is fixedly connected to one end of the blowing pipe 14. The blowing pipe 14 is located inside the blowing frame 7, and several blowing ports of the blowing pipe 14 are all aligned with the connection port 201.

[0060] More specifically, when the gas inside the multi-way pipe 12 passes through the electromagnetic valve 15, this part of the gas will enter the connecting pipe 13, and then enter the blowing pipe 14 inside the blowing frame 7 through the connecting pipe 13. Then, air can be blown from several blowing ports of the blowing pipe 14 against the back of the dust-proof net 4.

[0061] Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An explosion-proof inspection robot, comprising a pan-tilt body (1), a sound sensor (5) and a gas sensor (6) mounted on the pan-tilt body (1), characterized in that: The outer walls of the ends of the sound sensor (5) and the gas sensor (6) away from the pan / tilt body (1) are sleeved with and fixedly connected to a frame (2); an adjustment port (203) is provided on the side of the two frames (2) away from the pan / tilt body (1); the inner walls of the two adjustment ports (203) are connected to dustproof components; the total height of the two dustproof components does not exceed 2 / 3 of the inner wall of the frame (2); the upper and lower ends of the two adjustment ports (203) close to the pan / tilt body (1) are penetrated by connection ports (201); the upper and lower ends of the two frames (2) close to the pan / tilt body (1) are fixedly connected to a blowing frame (7); the two blowing frames (7) are respectively aligned and connected to the two connection ports (201); the side of the pan / tilt body (1) close to the sound sensor (5) is connected to a blowing mechanism; the output end of the blowing mechanism is connected to four shunt components; the four shunt components are respectively connected to four blowing frames (7).

2. The explosion-proof inspection robot according to claim 1, characterized in that: Slide grooves (202) are provided on both sides of the two adjustment openings (203), and the dustproof components are located in the two slide grooves (202).

3. The explosion-proof inspection robot according to claim 2, characterized in that: The dustproof component comprises a lifting mechanism, a sliding frame (16) and two dustproof nets (4); the lifting mechanism is connected to both sides of the sliding frame (16), and the lifting mechanism is located in two sliding grooves (202); the two dustproof nets (4) are fixedly connected to the inner wall of the sliding frame (16), and the outer wall of the sliding frame (16) is slidably connected to the inner wall of the adjustment port (203).

4. The explosion-proof inspection robot according to claim 3, characterized in that: The lifting mechanism comprises a transposition motor (9), a screw rod (18) and a slide rod (19); the outer wall of the transposition motor (9) is fixedly connected to the upper surface of the outer wall of the frame (2); the output shaft of the transposition motor (9) is fixedly connected to one end of the screw rod (18); the other end of the screw rod (18) passes through the frame (2), one side of the slide frame (16) and one of the slide grooves (202), and is threadedly connected to the inner wall of the slide frame (16); the outer wall of the screw rod (18) is rotatably connected to the inner wall of the frame (2); the slide rod (19) passes through the other side of the slide frame (16), and is slidably connected to the inner wall of the slide frame (16); and both ends of the slide rod (19) are fixedly connected to the inner wall of another slide groove (202).

5. The explosion-proof inspection robot according to claim 4, characterized in that: The upper and lower ends of the frame (2) on the side away from the pan / tilt head body (1) are both connected to support frames (8), the inner walls of the two support frames (8) are both fixedly connected to filter cloths (3), the two filter cloths (3) are respectively matched and aligned with the two connection ports (201), and the length and width of the support frame (8) are not less than the length and width of the dustproof net (4), and the side of the support frame (8) close to the dustproof net (4) is against the side of the sliding frame (16) away from the pan / tilt head body (1).

6. The explosion-proof inspection robot according to claim 5, characterized in that: Both sides of the support frame (8) are fixedly connected with mounting blocks (10), and the two mounting blocks (10) are fastened to the frame (2) by bolts.

7. An explosion-proof inspection robot according to claim 5 or 6, characterized in that: A partition plate (17) is fixedly connected to the middle of the sliding frame (16) on the side away from the pan / tilt head body (1), and the partition plate (17) is located between the two supporting frames (8).

8. An explosion-proof inspection robot according to claim 1, 2, 3, 4, 5 or 6, characterized in that: A support opening (101) is provided on one side of the pan / tilt body (1) close to the sound sensor (5), and the air blowing mechanism is located in the support opening (101).

9. The explosion-proof inspection robot according to claim 8, characterized in that: The air blowing mechanism comprises an air blowing pump (11), a multi-way pipe (12) and four solenoid valves (15); the outer wall of the air blowing pump (11) is fixedly connected to the inner wall of the support opening (101); the output end of the air blowing pump (11) is fixedly connected to one end of the multi-way pipe (12); the other ends of the multi-way pipe (12) are respectively connected to four flow diversion components; and the four solenoid valves (15) are respectively located in the other ends of the multi-way pipe (12).

10. The explosion-proof inspection robot according to claim 9, characterized in that: The flow splitter assembly comprises a connecting pipe (13) and a blowing pipe (14); one end of the connecting pipe (13) is fixedly connected to the inner wall of the multi-way pipe (12); the other end of the connecting pipe (13) passes through the blowing frame (7) and is fixedly connected to one end of the blowing pipe (14); the blowing pipe (14) is located in the blowing frame (7), and a plurality of blowing ports of the blowing pipe (14) are all aligned with the connecting port (201).

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