A gas detection and sampling device for mining goaf

Abstract

The present invention relates to the technical field of gas detection and sampling, and specifically relates to a gas detection and sampling device for goaf back mining, including a bottom plate, on which a storage box is fixedly arranged. It also includes a collection unit and a storage unit. The collection unit includes an adjustment box fixedly arranged on the storage box. A chute is opened in the adjustment box, and a sliding plate is slidably arranged in the chute. An air delivery pipe is fixedly arranged on the sliding plate, and a collector is fixedly arranged at the end of the air delivery pipe. The collection unit is used for sampling and collecting the gas in the goaf. By means of the partition plate arranged on the storage box, the staff can store multiple storage bags in the device storage box. When it is necessary to use the storage bag for gas storage, just move the sliding plate. Then, by means of the pressing plate control device arranged on the adjustment box, the position of the pressing plate is adjusted to use the storage and sampled gas in a specific chamber.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection and sampling, and in particular to a gas detection and sampling device for the gas extraction of a goaf during coal mining. Background Art

[0002] Gas detection mainly uses gas sensors to detect the types of gases present in the environment. A gas sensor is a sensor used to detect the composition and content of gases. In urban management, it is necessary for staff to conduct air gas detection in areas of the city to obtain urban air quality detection data. Among them, gas detectors are usually used for gas detection.

[0003] A gas detector is an instrument and tool for detecting gas leakage concentration, including portable gas detectors, handheld gas detectors, fixed gas detectors, online gas detectors, etc. It mainly uses gas sensors to detect the types of gases present in the environment. A gas sensor is a sensor used to detect the composition and content of gases. Gas sampling is the process of collecting samples of pollutants or contaminated air in the atmosphere.

[0004] In the operation of gas detection in a coal mine goaf, staff usually use gas sampling bags to collect gas samples in a closed area. Since a single sampling bag can only reflect the instantaneous gas concentration at a local position, and the gas distribution inside the goaf often has uneven phenomena such as stratification and eddy currents, to ensure the comprehensiveness and accuracy of the detection data, it is usually necessary to conduct multiple repeated samplings at different depths and orientations. Each time sampling is carried out, the staff must manually disassemble the connection device between the air pump and the sampling bag, replace the full old bag with a new sampling bag, and then reinstall and seal it, which affects the efficiency of gas sampling in multiple areas. Summary of the Invention

[0005] Based on the above problems existing in the prior art, the problem to be solved by the present application is: To ensure the comprehensiveness and accuracy of the detection data, it is usually necessary to conduct multiple repeated samplings at different depths and orientations. Each time sampling is carried out, the staff must manually disassemble the connection device between the air pump and the sampling bag, replace the full old bag with a new sampling bag, and then reinstall and seal it. This process not only requires repeatedly tightening the clamp and checking the airtightness, but may also cause operation errors due to the narrow space and dim light in the underground mine.

[0006] The technical solution adopted by the present application to solve its technical problems is: A gas detection and sampling device for the gas extraction of a goaf, including a bottom plate, a storage box fixedly arranged on the bottom plate, and further including a collection unit and a storage unit;

[0007] The collection unit includes an adjustment box fixedly arranged on the storage box. A chute is formed in the adjustment box. A sliding plate is slidably arranged in the chute. An air delivery pipe is fixedly arranged on the sliding plate. A collector is fixedly arranged at the end of the air delivery pipe. The collection unit is used for sampling and collecting the gas in the goaf.

[0008] The storage unit includes a partition fixedly arranged in the storage box. A plurality of evenly arranged connecting pipes are slidably arranged at the top of the storage box. One end of the sliding plate is fixedly provided with a corrugated pipe. A control groove is formed in the side wall of the adjustment box. A guide rod is fixedly arranged on the outer peripheral surface of the corrugated pipe. The guide rod is slidably connected with the control groove. The storage unit is used for transferring, receiving, storing and accommodating the gas collected by the collector.

[0009] Preferably, the partition divides the inside of the storage box into four storage chambers of equal size. Two symmetrically arranged pull rods are fixedly arranged on the outer peripheral surface of the storage box. And an anti-slip sleeve is sleeved on the outer peripheral surface of the pull rod.

[0010] Preferably, the chute is located above the control groove, and the control groove is bent. A limiting device for fixing the position of the guide rod is arranged at the bending part of the control groove.

[0011] Preferably, the limiting device includes a vertical groove formed in the adjustment box. A cylinder is slidably arranged in the vertical groove. A pressing plate is fixedly arranged at one end of the cylinder. A cylinder is slidably arranged at the other end of the cylinder. A pressing plate is fixedly arranged on the cylinder.

[0012] Preferably, a groove is formed in the side wall of the vertical groove. A clamping plate one is fixedly arranged on the groove. A limiting groove is formed in the adjustment box. A cross plate is slidably arranged in the limiting groove. The cross plate is fixedly connected with the cylinder. A clamping plate two which is mutually attached to the clamping plate one is fixedly arranged on the cylinder. A circular plate two is fixedly arranged in the cylinder. A circular plate one is fixedly arranged on the outer peripheral surface of the cylinder. The circular plate one is slidably connected with the cylinder. A spring two is fixedly arranged between the circular plate one and the circular plate two.

[0013] Preferably, a positioning shaft is fixedly arranged on the inner wall of the storage box. A control plate is fixedly arranged on the positioning shaft. The control plate is telescopic. The top of the control plate is V-shaped.

[0014] Preferably, a sleeve is fixedly arranged inside the storage box. The sleeve and the connecting pipe are coaxially arranged. A clamping ring is fixedly arranged on the outer peripheral surface of the connecting pipe. The lower end of the clamping ring is inclined. A first bracket is fixedly arranged on the side wall of the regulating plate. A second bracket is fixedly arranged at the upper end of the storage box. A telescopic limiting plate is rotatably arranged on the second bracket. A guiding groove is formed on the first bracket. A rotating shaft is fixedly arranged on the side wall of the limiting plate. The rotating shaft is slidably connected with the guiding groove.

[0015] Preferably, a turntable is fixedly arranged on the outer peripheral surface of the connecting pipe. A third spring is fixedly arranged on the turntable. The other end of the third spring is fixedly connected with the storage box.

[0016] Preferably, a long strip plate is fixedly arranged inside the sleeve. A rotating ring is rotatably arranged on the long strip plate. A scraping plate is fixedly arranged on the rotating ring. A clamping post is fixedly arranged on the side wall of the scraping plate. An arc-shaped groove is formed on the inner wall of the connecting pipe. The clamping post is slidably connected with the arc-shaped groove.

[0017] Preferably, a second baffle is fixedly arranged on the top end of the scraping plate. The second baffle is elastically arranged. A first baffle is fixedly arranged on the inner wall of the connecting pipe. The first baffle abuts against the second baffle.

[0018] The beneficial effect of this application is as follows: For a gas detection and sampling device for mining goaf provided by this application, through the partition plate arranged on the storage box, it enables the staff to store multiple storage bags in the device storage box. When it is necessary to use the storage bag for gas storage, just toggle the sliding plate. Then, through the pressing plate control device arranged on the adjustment box, by adjusting the position of the pressing plate, the storage and sampling gas in a specific chamber can be used.

[0019] The rotating ring arranged in the sleeve enables the scraping plate fixedly arranged on the rotating ring to rotate when using the connecting pipe to receive gas. At this time, the rotating scraping plate can remove the impurities on the inner wall of the connecting pipe. At the same time, the permeability of the connecting pipe is controlled by the first baffle and the second baffle to ensure the normal use of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[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 internal structure of the storage box of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the adjustment box of the present invention;

[0023] Figure 4 It is a schematic diagram of the internal structure of the adjustment box of the present invention;

[0024] Figure 5 is a schematic diagram of the local structure of the present invention;

[0025] Figure 6 is a schematic side view structure diagram of the present invention;

[0026] Figure 7 is Figure 6 an enlarged schematic diagram of the structure at position A in

[0027] Figure 8 is a schematic diagram of the internal structure of the housing of the present invention;

[0028] Figure 9 is a schematic diagram of the internal structure of the connecting pipe of the present invention.

[0029] In the figure: 1, bottom plate; 2, storage box; 21, pull rod; 22, partition board; 23, protection plate; 231, connecting plate; 232, clamping plate; 24, first spring; 25, positioning shaft; 26, regulation plate; 261, first bracket; 2611, guiding groove; 27, second bracket; 271, limiting plate; 272, rotating shaft; 3, adjustment box; 31, sliding groove; 32, regulation groove; 33, vertical groove; 331, groove; 332, first snap plate; 333, limiting groove; 34, cross plate; 341, pressing plate; 35, cylinder; 351, first circular plate; 352, second spring; 36, second circular plate; 37, cylinder; 371, second snap plate; 38, pressing plate; 4, sliding plate; 41, gas transmission pipe; 42, collector; 43, corrugated pipe; 431, guiding rod; 5, connecting pipe; 51, snap ring; 52, first baffle; 53, arc groove; 6, housing; 61, long strip plate; 62, rotating ring; 63, scraping plate; 631, clamping post; 64, second baffle; 7, turntable; 71, third spring. Specific embodiments

[0030] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will describe the present application in detail with reference to the drawings and in combination with the embodiments.

[0031] In order to enable those skilled in the art to better understand the solution of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0032] Referring to Figures 1-5 , a gas detection and sampling device for mining goafs includes a bottom plate 1, a storage box 2 is fixedly arranged on the bottom plate 1, and also includes a collection unit and a storage unit;

[0033] The collection unit includes an adjustment box 3 fixedly arranged on the storage box 2. A chute 31 is provided in the adjustment box 3. A sliding plate 4 is slidably arranged in the chute 31. An air delivery pipe 41 is fixedly arranged on the sliding plate 4. A collector 42 is fixedly arranged at the end of the air delivery pipe 41. The collection unit is used for sampling and collecting the gas in the goaf.

[0034] The storage unit includes a partition plate 22 fixedly arranged in the storage box 2. A plurality of uniformly arranged connecting pipes 5 are slidably arranged on the top of the storage box 2. One end of the sliding plate 4 is fixedly provided with a corrugated pipe 43. A control groove 32 is provided on the side wall of the adjustment box 3. A guide rod 431 is fixedly arranged on the outer peripheral surface of the corrugated pipe 43. The guide rod 431 is slidably connected with the control groove 32. The storage unit is used for transferring, receiving, storing and accommodating the gas collected by the collector 42.

[0035] Refer to Figures 1-3 , the partition plate 22 divides the inside of the storage box 2 into four storage chambers of equal size. Two symmetrically arranged pull rods 21 are fixedly arranged on the outer peripheral surface of the storage box 2. And an anti-slip sleeve is sleeved on the outer peripheral surface of the pull rod 21. A protection plate 23 is slidably arranged in each storage chamber. A first spring 24 is fixedly arranged on the bottom of the protection plate 23. The first spring 24 is fixedly connected with the bottom plate 1. A connecting plate 231 is fixedly arranged on the protection plate 23. A clamping plate 232 is fixedly arranged on the connecting plate 231. The pull rod 21 arranged on the side wall of the storage box 2 facilitates the staff to pick up the device. At the same time, the anti-slip sleeve arranged on the pull rod 21 increases the friction between the pull rod 21 and the palm, avoiding the occurrence of slipping.

[0036] Refer to Figures 1-3 , the chute 31 is located above the control groove 32, and the control groove 32 is arranged in a curved shape. A limiting device for fixing the position of the guide rod 431 is arranged at the bending part of the control groove 32. By arranging the control groove 32 in a complete setting, it is realized that the staff can control the up and down movement of the corrugated pipe 43 when sliding one end of the sliding plate 4.

[0037] Refer to Figures 3-5 , the limiting device includes a vertical groove 33 opened on the adjustment box 3. A cylinder 35 is slidably arranged in the vertical groove 33. A pressing plate 341 is fixedly arranged at one end of the cylinder 35. A cylinder 37 is slidably arranged at the other end of the cylinder 35. A pressing plate 38 is fixedly arranged on the cylinder 37. By arranging the vertical groove 33 on the adjustment box 3, when the staff adjusts the position of the pressing plate 38, at this time, there will be a gap in the vertical groove 33. When the corrugated pipe 43 moves to the bottom of the control groove 32, it can directly slide into the vertical groove 33 to ensure that the connecting pipe 5 and the air delivery pipe 41 can be aligned.

[0038] Refer to Figures 3-5, a groove 331 is provided on the side wall of the vertical groove 33, a snap plate one 332 is fixedly arranged on the groove 331, a limit groove 333 is provided in the adjustment box 3, a cross plate 34 is slidably arranged in the limit groove 333, the cross plate 34 is fixedly connected with the cylinder 35, a snap plate two 371 which is mutually attached to the snap plate one 332 is fixedly arranged on the cylinder 37, a circular plate two 36 is fixedly arranged in the cylinder 35, a circular plate one 351 is fixedly arranged on the outer peripheral surface of the cylinder 37, the circular plate one 351 is slidably connected with the cylinder 35, a spring two 352 is fixedly arranged between the circular plate one 351 and the circular plate two 36. When the staff presses the pressing plate 38, the cylinder 37 can be pushed to move, and the moving cylinder 37 can drive the snap plate two 371 to disengage from the snap plate one 332. At this time, the position of the adjustment pressing plate 341 can be moved up and down. When idle, the elastic force of the spring two 352 can keep the snap plate two 371 and the snap plate one 332 meshed with each other, avoiding the situation that the pressing plate 38 moves sideways and ensuring the overall stability of the device.

[0039] Refer to Figures 1-3 , a positioning shaft 25 is fixedly arranged on the inner wall of the storage box 2, a regulation plate 26 is fixedly arranged on the positioning shaft 25, the regulation plate 26 is of a telescopic type, the top of the regulation plate 26 is of a V-shaped setting. Through the regulation plate 26 arranged on the storage box 2, when the guide rod 431 moves, when the guide rod 431 moves to the bottom of the regulation groove 32, the guide rod 431 contacts the top end of the regulation plate 26, and the telescopic regulation plate 26 is pressed down during the moving process.

[0040] Refer to Figures 6-8 , a sleeve 6 is fixedly arranged in the storage box 2, the sleeve 6 is coaxially arranged with the connecting pipe 5, a clamping ring 51 is fixedly arranged on the outer peripheral surface of the connecting pipe 5, the lower end of the clamping ring 51 is inclined, a support one 261 is fixedly arranged on the side wall of the regulation plate 26, a support two 27 is fixedly arranged at the upper end of the storage box 2, a telescopic limiting plate 271 is rotatably arranged on the support two 27, a guide groove 2611 is provided on the support one 261, a rotating shaft 272 is fixedly arranged on the side wall of the limiting plate 271, and the rotating shaft 272 is slidably connected with the guide groove 2611. During the downward movement of the corrugated pipe 43, the connecting pipe 5 in direct contact with it will be pressed down and move. And during the movement of the regulation plate 26, the limiting plate 271 is driven to rotate through the support one 261. At this time, the other end of the limiting plate 271 tilts up, and the connecting pipe 5 is in a free telescopic state. When the corrugated pipe 43 disengages from the connecting pipe 5, at this time the limiting plate 271 is in a descending state, and the telescopic limiting plate 271 can contact and press down the connecting pipe 5 to make it return to its original position.

[0041] Refer to Figures 7-9, a turntable 7 is fixedly arranged on the outer peripheral surface of the connecting pipe 5, a third spring 71 is fixedly arranged on the turntable 7, and the other end of the third spring 71 is fixedly connected to the storage box 2. By means of the turntable 7 arranged on the outer peripheral surface of the connecting pipe 5, when the device is used, the third spring 71 can push the connecting pipe 5 to move upward.

[0042] Refer to Figures 7-9 , a long strip plate 61 is fixedly arranged inside the housing 6, a rotating ring 62 is rotatably arranged on the long strip plate 61, a scraping plate 63 is fixedly arranged on the rotating ring 62, a clamping column 631 is fixedly arranged on the side wall of the scraping plate 63, an arc-shaped groove 53 is formed in the inner wall of the connecting pipe 5, and the clamping column 631 is slidably connected to the arc-shaped groove 53. By means of the rotating ring 62 arranged on the long strip plate 61, when the connecting pipe 5 moves, the scraping plate 63 can be driven to rotate through the arc-shaped groove 53, and the rotating scraping plate 63 can scrape and clean the impurities in the connecting pipe 5.

[0043] Refer to Figures 7-9 , a second baffle 64 is fixedly arranged at the top end of the scraping plate 63, the second baffle 64 is elastically arranged, a first baffle 52 is fixedly arranged on the inner wall of the connecting pipe 5, and the first baffle 52 abuts against the second baffle 64. By means of the second baffle 64 arranged on the scraping plate 63 and the first baffle 52 inside the connecting pipe 5, when the scraping plate 63 rotates, the second baffle 64 can be controlled, so as to control the flow of gas in the connecting pipe 5.

[0044] The specific solution of this scheme is as follows: When using the device, the staff first aligns and installs the prepared gas storage bag with each connecting pipe 5 in the storage box 2. When a certain storage bag needs to be used, the pressing plate 38 at the corresponding part is toggled. At this time, a gap will appear in the vertical groove 33. When the corrugated pipe 43 moves to the bottom of the regulation groove 32, it can directly slide into the vertical groove 33 to ensure that the connecting pipe 5 and the gas transmission pipe 41 are aligned. When pressing the pressing plate 38, the cylinder 37 can be pushed to move. The moving cylinder 37 can drive the second buckle plate 371 to disengage from the first buckle plate 332. At this time, the position of the adjusting pressing plate 341 can be toggled up and down. When idle, the elastic force of the second spring 352 can keep the second buckle plate 371 and the first buckle plate 332 meshed with each other to avoid the side shift of the pressing plate 38 and ensure the overall stability of the device. During the downward movement of the corrugated pipe 43, the connecting pipe 5 in direct contact with it will be pressed and moved downward. And during the movement of the regulation plate 26, the limiting plate 271 is driven to rotate by the first bracket 261. At this time, the other end of the limiting plate 271 tilts up, and the connecting pipe 5 is in a freely telescopic state. When the corrugated pipe 43 disengages from the connecting pipe 5, at this time, the limiting plate 271 is in a descending state. The telescopic limiting plate 271 can contact and press the connecting pipe 5 with the snap ring 51 to make it return to its original position. And as the storage bag expands, it will press the protection plate 23 downward. The moving protection plate 23 drives the clamping plate 232 to move downward through the connecting plate 231, thereby realizing the control of the movement of the connecting pipe 5 and disconnecting the gas transmission to ensure the stability of the internal air pressure of the storage bag.

[0045] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary. Under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order. There are many other variations in different aspects of the present invention as above, and they are not provided in detail for the sake of brevity.

[0046] The present invention aims to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A gas detection and sampling device for mining goafs, comprising a bottom plate (1), and a storage box (2) is fixedly arranged on the bottom plate (1), characterized in that, It also includes a collection unit and a storage unit; The collection unit includes an adjustment box (3) fixedly arranged on the storage box (2). A chute (31) is formed in the adjustment box (3). A slide plate (4) is slidably arranged in the chute (31). An air delivery pipe (41) is fixedly arranged on the slide plate (4). A collector (42) is fixedly arranged at the end of the air delivery pipe (41). The collection unit is used for sampling and collecting the gas in the goaf; The storage unit includes a partition plate (22) fixedly arranged in the storage box (2). A plurality of uniformly arranged connecting pipes (5) are slidably arranged at the top of the storage box (2). One end of the slide plate (4) is fixedly provided with a corrugated pipe (43). A control groove (32) is formed in the side wall of the adjustment box (3). A guide rod (431) is fixedly arranged on the outer peripheral surface of the corrugated pipe (43). The guide rod (431) is slidably connected with the control groove (32). The storage unit is used for transferring, receiving, storing and accommodating the gas collected by the collector (42).

2. The gas detection and sampling device for goaf recovery according to claim 1, characterized in that, The partition plate (22) divides the interior of the storage box (2) into four storage chambers of equal size. Two symmetrically arranged pull rods (21) are fixedly arranged on the outer peripheral surface of the storage box (2). An anti-slip sleeve is sleeved on the outer peripheral surface of the pull rod (21). A protection plate (23) is slidably arranged in each storage chamber. A first spring (24) is fixedly arranged at the bottom of the protection plate (23). The first spring (24) is fixedly connected with the bottom plate (1). A connecting plate (231) is fixedly arranged on the protection plate (23). A clamping plate (232) is fixedly arranged on the connecting plate (231).

3. The gas detection and sampling device for mining goaf according to claim 1, characterized in that, The chute (31) is located above the control groove (32), and the control groove (32) is arranged in a curved shape. A limiting device for fixing the position of the guide rod (431) is arranged at the bending part of the control groove (32).

4. The gas detection and sampling device for extracting goaf according to claim 3, characterized in that, The limiting device includes a vertical groove (33) formed in the adjustment box (3). A cylinder (35) is slidably arranged in the vertical groove (33). A pressing plate (341) is fixedly arranged at one end of the cylinder (35). A cylinder (37) is slidably arranged at the other end of the cylinder (35). A pressing plate (38) is fixedly arranged on the cylinder (37).

5. The gas detection and sampling device for mining goaf according to claim 4, characterized in that A groove (331) is formed on the side wall of the vertical groove (33). A first snap plate (332) is fixedly arranged on the groove (331). A limit groove (333) is formed in the adjustment box (3). A cross plate (34) is slidably arranged in the limit groove (333). The cross plate (34) is fixedly connected to the cylinder (35). A second snap plate (371) which is mutually attached to the first snap plate (332) is fixedly arranged on the cylinder (37). A second circular plate (36) is fixedly arranged in the cylinder (35). A first circular plate (351) is fixedly arranged on the outer peripheral surface of the cylinder (37). The first circular plate (351) is slidably connected to the cylinder (35). A second spring (352) is fixedly arranged between the first circular plate (351) and the second circular plate (36).

6. The gas detection and sampling device for mining goaf according to claim 1, characterized in that, A positioning shaft (25) is fixedly arranged on the inner wall of the storage box (2). A control plate (26) is fixedly arranged on the positioning shaft (25). The control plate (26) is of a telescopic type. The top of the control plate (26) is of a V-shaped setting.

7. The gas detection and sampling device for mining goaf according to claim 6, characterized in that, A sleeve (6) is fixedly arranged in the storage box (2). The sleeve (6) and the connecting pipe (5) are coaxially arranged. A clamping ring (51) is fixedly arranged on the outer peripheral surface of the connecting pipe (5). The lower end of the clamping ring (51) is inclined. A first bracket (261) is fixedly arranged on the side wall of the control plate (26). A second bracket (27) is fixedly arranged at the upper end of the storage box (2). A telescopic limiting plate (271) is rotatably arranged on the second bracket (27). A guiding groove (2611) is formed in the first bracket (261). A rotating shaft (272) is fixedly arranged on the side wall of the limiting plate (271). The rotating shaft (272) is slidably connected to the guiding groove (2611).

8. The gas detection and sampling device for mining goaf according to claim 7, characterized in that, A turntable (7) is fixedly arranged on the outer peripheral surface of the connecting pipe (5). A third spring (71) is fixedly arranged on the turntable (7). The other end of the third spring (71) is fixedly connected to the storage box (2).

9. The gas detection and sampling device for mining goaf according to claim 7, characterized in that, A long strip plate (61) is fixedly arranged inside the sleeve (6). A rotating ring (62) is rotatably arranged on the long strip plate (61). A scraping plate (63) is fixedly arranged on the rotating ring (62). A clamping column (631) is fixedly arranged on the side wall of the scraping plate (63). An arc groove (53) is formed in the inner wall of the connecting pipe (5). The clamping column (631) is slidably connected to the arc groove (53).

10. The gas detection and sampling device for mining goaf according to claim 9, characterized in that, A second baffle (64) is fixedly arranged at the top end of the scraping plate (63). The second baffle (64) is of an elastic type. A first baffle (52) is fixedly arranged on the inner wall of the connecting pipe (5). The first baffle (52) abuts against the second baffle (64).

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