An air sampling monitoring device for air pollution control

Abstract

The present invention relates to the field of environmental monitoring technology, and specifically to an air sampling monitoring device for air pollution control, comprising an adjustment column, a lifting slot is provided on the outer wall of the adjustment column, a lifting module is sleeved on the outer side of the adjustment column, the lifting module is slidably connected to the lifting slot, a mounting ring is provided on the outer side of the lifting module, a number of evenly distributed connecting rods are fixedly installed between the inner ring wall of the mounting ring and the lifting module, a driving slot of a circular ring structure is provided on the outer wall of the mounting ring, a driving slider is slidably installed in the driving slot, and a driving slot extends from one side of the driving slider and is fixedly installed with an exhaust module. The present invention designs a placement rack, which can be aligned with several placement racks in turn through the movement of the exhaust module. When the exhaust module is aligned with the placement rack, it can drive the airflow through the filter membrane on the placement rack to achieve air sampling, which greatly improves the efficiency of air sampling.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental monitoring, and in particular to an air sampling and monitoring device for air pollution control. Background Art

[0002] Air pollution is a very common type of environmental pollution in modern society. Mainly with the development of society, the emission of various industrial waste gases and automobile exhaust has made the level of air pollution in the current environment increasingly high.

[0003] In order to cope with the increasingly serious air pollution, environmental protection personnel will use air sampling and monitoring devices to sample and monitor the atmosphere and carry out targeted air pollution control. The membrane filter method is a commonly used method in existing air sampling and monitoring. It mainly extracts air through the membrane filter, and then determines the content of particulate matter in the air by weighing the membrane filter. Finally, the membrane filter can be sealed and other pollutants adsorbed on the membrane filter can be tested in the laboratory to achieve the purpose of sampling. However, existing membrane filter air sampling and monitoring devices can usually only install a single membrane filter. When long-term atmospheric monitoring is required, the operator is required to constantly replace the membrane filter, which is inconvenient. In addition, the operator cannot leave for a long time, further increasing the cost of atmospheric monitoring. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the background technology and to propose an air sampling and monitoring device for air pollution control.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an air sampling monitoring device for air pollution control, comprising an adjusting column, a lifting slot is provided on the outer wall of the adjusting column, a lifting module is sleeved on the outer side of the adjusting column, the lifting module is slidably connected with the lifting slot, a mounting ring is provided on the outer side of the lifting module, and a plurality of evenly distributed connecting rods are fixedly installed between the inner ring wall of the mounting ring and the lifting module;

[0006] A driving slide groove of a circular ring structure is provided on the outer wall of the mounting ring, a driving slider is slidably installed in the driving slide groove, and a driving slide groove is extended from one side of the driving slider and a vacuum module is fixedly installed thereon;

[0007] A plurality of upper brackets and lower brackets evenly distributed along the circumference are fixedly installed on the outer wall of the mounting ring and located above and below the driving slide groove, respectively. The plurality of upper brackets and the plurality of lower brackets correspond to each other one by one. A placement rack with a circular ring structure is hingedly connected to one end of the lower bracket away from the mounting ring. The installation position of the placement rack corresponds to the exhaust module. A placement groove is provided on the inner ring wall of the placement rack. A plug-in groove is provided on the top of the placement rack. The plug-in groove runs through the placement rack and is connected to the placement groove. A filter membrane is inserted in the placement groove. A positioning block is fixedly installed on one side of the placement rack close to the upper bracket. A positioning slot is provided at one end of the upper bracket away from the mounting ring. The positioning block is matched with the corresponding positioning slot in a concave-convex manner.

[0008] In the above-mentioned air sampling and monitoring device for air pollution control, an air pump is fixedly installed in the air extraction module, a telescopic groove is opened on the side of the air extraction module away from the driving slider, the telescopic groove is connected with the air extraction pump, a telescopic tube is inserted in the telescopic groove, a bellows is fixedly installed between the telescopic tube and the air extraction pump, one end of the telescopic tube away from the bellows extends out of the telescopic groove and is installed with a linkage plate, a telescopic rod one is fixedly installed in the air extraction module and on one side of the telescopic groove, the telescopic end of the telescopic rod one passes through the air extraction module and is fixedly connected to the linkage plate.

[0009] In the above-mentioned air sampling and monitoring device for air pollution control, a drainage hood with a funnel-shaped structure is fixedly installed on the side of the placement frame close to the mounting ring, and a drainage port is opened on the side of the drainage hood away from the placement frame, and the inner diameter of the drainage port is larger than the outer diameter of the telescopic tube.

[0010] In the above-mentioned air sampling and monitoring device for air pollution control, a sealing ring is fixedly installed on the inner wall of the drainage port, and an inclined surface is provided on the inner ring wall of the sealing ring.

[0011] In the above-mentioned air sampling and monitoring device for air pollution control, a connecting base with an arc-shaped structure is inserted in the plug-in slot, and two symmetrically arranged telescopic rods 2 are fixedly installed at the bottom of the connecting base. The telescopic ends of the telescopic rods 2 are in a pointed cone structure, and the telescopic ends of the telescopic rods 2 are inserted in the filter membrane. A gravity sensor unit is fixedly installed at the bottom of the inner wall of the placement slot, and the gravity sensor unit is in contact with the bottom of the filter membrane.

[0012] In the above-mentioned air sampling and monitoring device for air pollution control, a disc-shaped isolation plate is hingedly connected to the side of the placement rack away from the exhaust module through a spring hinge, and a handle with an arc-shaped structure is fixedly installed on the side of the isolation plate away from the placement rack. A pressing groove is opened in the lower bracket, and a pull wire is fixedly installed on the inner wall of the pressing groove. The end of the pull wire away from the pressing groove passes through the lower bracket and is fixedly connected to the handle. An extrusion block is fixedly installed on the bottom of the exhaust module, and a telescopic block is inserted on the top of the lower bracket. The bottom of the telescopic block extends into the pressing groove and contacts with the pull wire.

[0013] In the above-mentioned air sampling monitoring device for air pollution control, a spring bead is inserted into the top of the telescopic block, and a sensing groove is opened at the bottom of the extrusion block. The sensing groove matches the spring bead in a concave-convex manner, and a sensing unit is installed in the sensing groove.

[0014] In the above-mentioned air sampling monitoring device for air pollution control, two symmetrically arranged telescopic rods three are fixedly installed in the lifting module, and the telescopic ends of the telescopic rods three pass through the lifting module and are fixedly installed with protective covers with arc-shaped structures.

[0015] Compared with the existing technology, the advantages of the air sampling monitoring device for air pollution control are: the present invention designs a placement rack, which can be aligned with several placement racks in turn through the movement of the vacuum module. When the vacuum module is aligned with the placement rack, it can drive the airflow to pass through the filter membrane on the placement rack to achieve air sampling, which greatly improves the efficiency of air sampling. At the same time, it has a high degree of automation and can control the vacuum module to move intermittently within a specified time through an external control unit to achieve sampling, which solves the problem of high labor costs in the existing air sampling process and improves the sampling efficiency. At the same time, during the sampling process, the weight of the filter membrane can be monitored in real time with the cooperation of the gravity sensing unit, which further improves the efficiency of atmospheric sampling and monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the adjustment column and the protective cover in the present invention.

[0017] Figure 2 It is a three-dimensional structural schematic diagram of the mounting ring and the placement frame in the present invention.

[0018] Figure 3 It is a three-dimensional structural schematic diagram of the placement rack in the present invention.

[0019] Figure 4 The present invention Figure 3 Schematic diagram of the local enlarged structure at point A in the middle.

[0020] Figure 5 It is a schematic cross-sectional structural diagram of the air extraction module and the placement rack in the present invention.

[0021] Figure 6 The present invention Figure 5 Schematic diagram of the local enlarged structure at point B in the middle.

[0022] Figure 7 The present invention Figure 5 Schematic diagram of the local enlarged structure at point C in the middle.

[0023] Figure 8 The present invention Figure 5 Schematic diagram of the local enlarged structure at point D in the middle.

[0024] Fig. 9 The present invention Figure 5 Schematic diagram of the local enlarged structure at point E in the middle.

[0025] Fig.10 It is a schematic cross-sectional structural diagram of the placement rack in the present invention.

[0026] Fig.11 It is a partial cross-sectional structural schematic diagram of the lifting module and the protective cover in the present invention.

[0027] In the figure: 1. Adjustment column; 101. Lifting slide; 2. Lifting module; 3. Mounting ring; 301. Drive slide; 302. Drive slider; 303. Upper bracket; 304. Lower bracket; 4. Exhaust module; 5. Placement rack; 501. Placement slot; 502. Plug-in slot; 503. Filter membrane; 504. Positioning block; 305. Positioning slot; 401. Exhaust pump; 402. Telescopic slot; 403. Telescopic tube; 405. Linking plate; 406. Telescopic rod one; 505. Drainage cover; 506. Drainage port; 508. Connecting base; 509. Telescopic rod two; 511. Isolation plate; 512. Handle; 407. Extrusion block; 306. Pressing slot; 307. Pull wire; 308. Telescopic block; 309. Spring bead; 408. Induction groove; 201. Telescopic rod three; 6. Protective cover. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] Reference Figure 1-Figure 11An air sampling monitoring device for air pollution control includes an adjusting column 1, a lifting slot 101 is provided on the outer wall of the adjusting column 1, a lifting module 2 is sleeved on the outer side of the adjusting column 1, the lifting module 2 is slidably connected to the lifting slot 101, a mounting ring 3 is provided on the outer side of the lifting module 2, a plurality of evenly distributed connecting rods are fixedly installed between the inner ring wall of the mounting ring 3 and the lifting module 2, the adjusting column 1 is fixed on the moving device, a lead screw is provided in the lifting slot 101, and the lifting module 2 can be driven to reciprocate and lift on the adjusting column 1 by the drive of the lead screw, so that the height of the atmospheric sampling can be conveniently adjusted.

[0031] A driving groove 301 with a circular ring structure is provided on the outer wall of the mounting ring 3, and a driving slider 302 is slidably installed in the driving groove 301. The driving groove 301 extends from one side of the driving slider 302 and a vacuum module 4 is fixedly installed thereon. The mounting ring 3 drives the vacuum module 4 to reciprocate through the driving groove 301 and the driving slider 302.

[0032] On the outer wall of the mounting ring 3 and above and below the driving slide groove 301, a plurality of upper brackets 303 and lower brackets 304 uniformly distributed along the circumference thereof are fixedly installed respectively, and the plurality of upper brackets 303 and the plurality of lower brackets 304 correspond to each other one by one, and a placement rack 5 with a ring-shaped structure is hingedly connected at one end of the lower bracket 3 away from the mounting ring 3, and the installation position of the placement rack 5 corresponds to the exhaust module 4, and a placement groove 501 is provided on the inner ring wall of the placement rack 5, and a plug-in groove 502 is provided on the top of the placement rack 5, and the plug-in groove 502 runs through the placement rack 5 and is connected to the placement groove 501, and a filter membrane 503 is inserted in the placement groove 501, and a positioning block 504 is fixedly installed on one side of the placement rack 5 close to the upper bracket 303, and a positioning slot 30 is provided at one end of the upper bracket 303 away from the mounting ring 3 5. The positioning block 504 is matched with the corresponding positioning slot 305. The upper bracket 303 and the lower bracket 304 are used to connect the placement rack 5. The filter membrane 503 can be inserted into the placement rack 5 through the placement slot 501. When the exhaust module 4 moves to the specified position, it will be aligned with the placement rack 5 at the corresponding position. At this time, the exhaust through the exhaust module 4 can drive the air to flow and pass through the filter membrane 503. The placement rack 5 can be flipped on the lower bracket 304, which can facilitate the placement rack 5 to be unfolded to a horizontal state. The placement rack 5 in this state can facilitate the installation and removal of the filter membrane 503. The positioning block 504 cooperates with the positioning slot 305 on the upper bracket 303 to fix the placement rack 5 when the placement rack 5 is in a vertical state to prevent the placement rack 5 from automatically unfolding during use.

[0033] An air pump 401 is fixedly installed in the air extraction module 4, and a telescopic groove 402 is opened on the side of the air extraction module 4 away from the driving slider 302, the telescopic groove 402 is connected with the air extraction pump 401, a telescopic tube 403 is inserted in the telescopic groove 402, a bellows is fixedly installed between the telescopic tube 403 and the air extraction pump 401, one end of the telescopic tube 403 away from the bellows extends out of the telescopic groove 402 and is installed with a linkage plate 405, a telescopic rod 406 is fixedly installed in the air extraction module 4 and on one side of the telescopic groove 402, the telescopic end of the telescopic rod 406 passes through the air extraction module 4 and is fixedly connected to the linkage plate 405, the air extraction pump 401 is used to drive the air flow, the telescopic rod 406 is an electric telescopic rod, and the telescopic tube 403 can be driven to reciprocate in the telescopic groove 402 through the telescopic movement of the telescopic rod 406 and the linkage plate 405.

[0034] A drainage hood 505 with a funnel-shaped structure is fixedly installed on one side of the placement rack 5 close to the mounting ring 3, and a drainage port 506 is opened on the side of the drainage hood 505 away from the placement rack 5. The inner diameter of the drainage port 506 is larger than the outer diameter of the telescopic tube 403. When the vacuum module 4 moves to the specified position, it will be aligned with one of the several placement racks 5. The telescopic rod 406 is operated to push the telescopic tube 403 to extend and insert it into the drainage port 506 on the aligned drainage hood 505. At this time, the vacuum pump 401 is operated to drive the air to pass through the filter membrane 503 on the aligned placement rack 5. Under the action of the drainage hood 505, a large amount of air will quickly pass through the filter membrane 503, thereby improving the sampling efficiency.

[0035] A sealing ring is fixedly installed on the inner wall of the drainage port 506, and an inclined surface is provided on the inner ring wall of the sealing ring. When the telescopic tube 403 is extended into the drainage port 506, the outer wall of the telescopic tube 403 will contact the sealing ring, which can further improve the sealing effect of the drainage cover 505 and the suction force of the vacuum pump 401.

[0036] A connecting base 508 with an arc-shaped structure is inserted in the plug-in slot 502, and two symmetrically arranged telescopic rods 509 are fixedly installed at the bottom of the connecting base 508. The telescopic ends of the telescopic rods 509 are in a pointed cone structure, and the telescopic ends of the telescopic rods 509 are inserted in the filter membrane 503. A gravity sensor unit is fixedly installed at the bottom of the inner wall of the placement slot 501, and the gravity sensor unit is in contact with the bottom of the filter membrane 503. The connecting base 508 cooperates with the telescopic rods 509 to fix the filter membrane 503. The existing air sampling filter membrane is a disc-shaped structure with a certain thickness. Therefore, when installing, the filter membrane is 503 is inserted into the telescopic end of the telescopic rod 509, and the filter membrane 503 is inserted into the placement groove 501 through the plug-in groove 502. When the filter membrane 503 is inserted into the placement groove 501, it will drive the connecting base 508 to be inserted into the plug-in groove 502 synchronously. When the placement rack 5 is in a vertical state, the filter membrane 503 will generate a downward force under the action of gravity. At this time, the filter membrane 503 can be weighed by the gravity sensing unit. After the filter membrane 503 is sampled, the weight of the filter membrane 503 can be monitored in time by the gravity sensing unit, so as to judge the content of particulate matter in the atmosphere and achieve the purpose of atmospheric sampling and monitoring.

[0037] A disc-shaped isolation plate 511 is hingedly connected to the side of the placement rack 5 away from the exhaust module 4 through a spring hinge, and a handle 512 with an arc-shaped structure is fixedly installed on the side of the isolation plate 511 away from the placement rack 5. A pressing groove 306 is opened in the lower bracket 304, and a pull wire 307 is fixedly installed on the inner wall of the pressing groove 306. One end of the pull wire 307 away from the pressing groove 306 passes through the lower bracket 304 and is fixedly connected to the handle 512. An extrusion block 407 is fixedly installed at the bottom of the exhaust module 4, and a telescopic block 308 is inserted at the top of the lower bracket 304. The bottom of the telescopic block 308 extends into the pressing groove 306 and contacts with the pull wire 307. The isolation plate 511 will fit on one side of the placement rack 5 under the action of the spring hinge. The filter membrane 503 when not in use can be sealed by the isolation plate 511 to prevent particulate matter in the air from being adsorbed on the unused filter membrane 503 and affecting the accuracy of the monitoring data. When the vacuum module 4 moves to the specified position, it will drive the extrusion block 407 to press the telescopic block 308. The ends of the extrusion block 407 and the telescopic block 308 are both arc-shaped structures. When the telescopic block 308 is pressed, the pull wire 307 will be squeezed, and the pull wire 307 will be bent due to the squeezing. The bent pull wire 307 will shrink and expand by pulling the isolation plate 511 through the handle 512 to expose the filter membrane 503. At this time, the air can be pumped through the vacuum module 4 to pass through the filter membrane 503 to achieve atmospheric sampling monitoring.

[0038] A spring bead 309 is inserted at the top of the telescopic block 308, and a sensing groove 408 is opened at the bottom of the extrusion block 407. The sensing groove 408 and the spring bead 309 are matched with each other, and a sensing unit is installed in the sensing groove 408. When the extrusion block 407 is completely aligned with the telescopic block 308, the spring bead 309 will be inserted into the sensing groove 408. The sensing unit in the sensing groove 408 can control the driving slider 302 to stop moving, thereby realizing the precise positioning of the exhaust module 4. The positioned exhaust module 4 will be aligned with the placement rack 5 at the specified position.

[0039] Two symmetrically arranged telescopic rods 3 201 are fixedly installed in the lifting module 2. The telescopic ends of the telescopic rods 3 201 pass through the lifting module 2 and are fixedly installed with a protective cover 6 with an arc structure. The telescopic rods 3 201 are electric telescopic rods. The telescopic rods 3 201 are used to drive the protective cover 6 to rise and fall. When encountering rain during sampling, the protective cover 6 can be lowered to protect the placement rack 5 to prevent rain from wetting the filter membrane 503.

[0040] The specific working principle and use method of the present invention are explained in detail below: when in use, the adjustment column 1 is fixed to the moving device, the moving device drives the adjustment column 1 to move to the specified position, the lifting module 2 is operated to drive the mounting ring 3 to move the adjustment column 1 to the specified position, the exhaust module 4 is operated to the specified position and aligned with the placement frame 5 at the specified position;

[0041] Operate the telescopic rod 406 to push the telescopic tube 403 out and insert it into the drainage port 506 on the aligned drainage cover 505. At this time, operate the vacuum pump 401 to drive air to pass through the filter membrane 503 on the aligned placement rack 5. Under the action of the drainage cover 505, a large amount of air will quickly pass through the filter membrane 503, thereby improving the sampling efficiency.

[0042] It is further explained that the above-mentioned fixed connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, it can be welding, gluing, or one-piece molding, etc., which are conventional means well known to those skilled in the art.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An air sampling and monitoring device for air pollution control, comprising an adjustment column (1), characterized in that: The outer wall of the adjusting column (1) is provided with a lifting slot (101), the outer side of the adjusting column (1) is sleeved with a lifting module (2), the lifting module (2) is slidably connected to the lifting slot (101), a mounting ring (3) is provided on the outer side of the lifting module (2), and a plurality of evenly distributed connecting rods are fixedly installed between the inner ring wall of the mounting ring (3) and the lifting module (2); A driving groove (301) of a circular ring structure is provided on the outer wall of the mounting ring (3), a driving slider (302) is slidably mounted in the driving groove (301), and a suction module (4) is fixedly mounted on one side of the driving slider (302) extending out of the driving groove (301); A plurality of upper brackets (303) and lower brackets (304) evenly distributed along the circumference of the mounting ring (3) are fixedly mounted on the outer wall of the mounting ring (3) and located above and below the driving slide groove (301). The plurality of upper brackets (303) and the plurality of lower brackets (304) correspond to each other one by one. A placement rack (5) with a circular ring structure is hingedly connected to one end of the lower bracket (304) away from the mounting ring (3). The mounting position of the placement rack (5) corresponds to the exhaust module (4). A placement groove ( 501), a plug-in slot (502) is provided on the top of the placement rack (5), the plug-in slot (502) passes through the placement rack (5) and is connected to the placement slot (501), a filter membrane (503) is inserted in the placement slot (501), a positioning block (504) is fixedly installed on one side of the placement rack (5) close to the upper bracket (303), and a positioning slot (305) is provided on one end of the upper bracket (303) away from the mounting ring (3), and the positioning block (504) and the corresponding positioning slot (305) are matched in a concave-convex manner; A disc-shaped isolation plate (511) is hingedly connected to the side of the placement rack (5) away from the air extraction module (4) via a spring hinge, and a handle (512) of an arc-shaped structure is fixedly installed on the side of the isolation plate (511) away from the placement rack (5). A pressing groove (306) is provided in the lower bracket (304), and a pull wire (307) is fixedly installed on the inner wall of the pressing groove (306). One end of the pull wire (307) away from the pressing groove (306) passes through the lower bracket (304) and is fixedly connected to the handle (512). An extrusion block (407) is fixedly installed at the bottom of the air extraction module (4), and a telescopic block (308) is inserted into the top of the lower bracket (304). The bottom of the telescopic block (308) extends into the pressing groove (306) and contacts the pull wire (307). A spring bead (309) is inserted into the top of the telescopic block (308), and a sensing groove (408) is provided at the bottom of the extrusion block (407). The sensing groove (408) and the spring bead (309) are matched in a concave-convex manner, and a sensing unit is installed in the sensing groove (408).

2. The air sampling and monitoring device for air pollution control according to claim 1, characterized in that: An air pump (401) is fixedly installed in the air extraction module (4); a telescopic groove (402) is provided on a side of the air extraction module (4) away from the driving slider (302); the telescopic groove (402) is connected to the air extraction pump (401); a telescopic tube (403) is inserted into the telescopic groove (402); a bellows is fixedly installed between the telescopic tube (403) and the air extraction pump (401); one end of the telescopic tube (403) away from the bellows extends out of the telescopic groove (402) and is installed with a linkage plate (405); a telescopic rod (406) is fixedly installed in the air extraction module (4) and located on one side of the telescopic groove (402); the telescopic end of the telescopic rod (406) passes through the air extraction module (4) and is fixedly connected to the linkage plate (405).

3. The air sampling and monitoring device for air pollution control according to claim 2, characterized in that: A drainage cover (505) with a funnel-shaped structure is fixedly mounted on one side of the placement rack (5) close to the mounting ring (3), and a drainage port (506) is provided on the side of the drainage cover (505) away from the placement rack (5), wherein the inner diameter of the drainage port (506) is greater than the outer diameter of the telescopic tube (403).

4. The air sampling and monitoring device for air pollution control according to claim 3 is characterized in that: A sealing ring is fixedly mounted on the inner wall of the drainage port (506), and an inclined surface is provided on the inner ring wall of the sealing ring.

5. The air sampling and monitoring device for air pollution control according to claim 2, characterized in that: A connecting base (508) with an arc-shaped structure is inserted into the plug-in slot (502), and two symmetrically arranged telescopic rods (509) are fixedly installed at the bottom of the connecting base (508). The telescopic ends of the telescopic rods (509) are in a pointed cone-shaped structure. The telescopic ends of the telescopic rods (509) are inserted into the filter membrane (503). A gravity sensor unit is fixedly installed at the bottom of the inner wall of the placement slot (501), and the gravity sensor unit is in contact with the bottom of the filter membrane (503).

6. The air sampling and monitoring device for air pollution control according to claim 1, characterized in that: Two symmetrically arranged telescopic rods (201) are fixedly installed in the lifting module (2); the telescopic ends of the telescopic rods (201) penetrate the lifting module (2) and are fixedly installed with protective covers (6) with circular arc structures.

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