Efficient sampling device for heavy metals in ambient air
Patent Information
- Application Number
- CN202620048863.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-15
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2036-01-15
AI Technical Summary
目前，环境空气中重金属采用的检测方法是，将空气中的重金属通过滤膜采样法收集后，再将采样后进行预处理、实验室分析、数据处理与质量控制等步骤，空气在进行重金属的检测中，滤膜采样是检测的关键步骤，现有的技术中，空气中重金属的采样装置主要是在采样管内安装有滤膜，滤膜采用膜夹固定后进行采样，此结构的采样装置在使用的过程中存在以下的不足，一是滤膜的捕集范围小，捕集效果不理想，且膜夹的稳定性差，滤膜容易脱落，另外，从采样管内取出滤膜的难度大，耗时长，效率较低；二是现有的采样管结构单一，不能进行长度的伸缩，采样的范围窄，同时由于空气中的重金属粒度不均匀，金属颗粒经过滤膜捕集后，其捕集的金属粒度粒度过大，会影响后续重金属成分的检测精度
[0005]与现有的技术相比，本装置的优点在于：一是本装置优化了采样管组件的结构，采样伸缩管采用伸缩式的结构，采样伸缩管的长度可以适时的调节，通过调节采样伸缩管的长度，可以调整采样的范围，提高采样的效果，同时汇聚筒内部设置的切粒机构可以对空气中的重金属进行切粒处理，空气中的重金属经过切粒机构的处理后，采样后的重金属粒度减小，粒度减小的重金属在便于采样滤袋收集的同时，有利于提高后续检测的精度；二是优化了采样滤袋的安装结构，采样滤袋竖直安装在采样箱内，可以扩大采样滤袋捕集重金属的捕集范围，能够完全对空气中的重金属进行完全的捕集，同时，采样压袋组件对采样滤袋进行压紧固定，一方面能够提高采样滤袋安装的稳定性，防止采样滤袋脱落，另一方面是采样压袋组件的结构，采样滤袋的安装、拆卸比较方便和容易，可以节省大量的取袋时间，提高采样的效率。本装置具有结构合理、采样效率高、使用效果好的优点，易于推广使用。
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Figure CN224906422U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of environmental quality testing technology, specifically relating to a high-efficiency sampling device for heavy metals in ambient air. Background Technology
[0002] Heavy metals in the atmosphere generally refer to metallic elements with a density greater than 4.5 g / cm³, commonly including lead (Pb), mercury (Hg), cadmium (Cd), cadmium (Cr), arsenic (As), copper (Cu), and zinc (Zn). Among these, lead, mercury, cadmium, chromium, and arsenic are heavy metals with significant biotoxicity that are of particular concern in environmental pollution control. These heavy metals mainly originate from human activities, such as industrial production (waste gases emitted from mining, smelting, and chemical processes), traffic exhaust (especially lead produced from the combustion of leaded gasoline), agricultural activities (heavy metals contained in pesticides and fertilizers), and municipal solid waste incineration. In the atmosphere, they often exist in the form of aerosols or particulate matter, and can migrate through processes such as wind and precipitation, posing a threat to ecosystems and human health. Heavy metals are difficult to degrade in the atmosphere and can accumulate through the food chain. For example, mercury accumulates in aquatic organisms and then enters the human body, causing chronic poisoning. Lead and mercury may also affect the nervous system, and cadmium can cause kidney damage. Therefore, it is necessary to monitor heavy metals in the ambient air to facilitate the implementation of reasonable environmental protection measures. Currently, the method for detecting heavy metals in ambient air involves collecting heavy metals through a filter membrane sampling method, followed by pretreatment, laboratory analysis, data processing, and quality control. Filter membrane sampling is a crucial step in heavy metal detection. Existing technologies primarily use sampling devices with a filter membrane installed inside a sampling tube, secured by a membrane clamp. This structure has several drawbacks: first, the filter membrane has a small capture range, resulting in unsatisfactory capture efficiency; second, the membrane clamp has poor stability, leading to easy membrane detachment; and third, removing the filter membrane from the sampling tube is difficult, time-consuming, and inefficient. Finally, existing sampling tubes have a simple structure, cannot be extended or retracted, and have a narrow sampling range. Furthermore, due to the uneven particle size of heavy metals in the air, the captured particles are often too large, affecting the accuracy of subsequent heavy metal component detection. Therefore, it is an objective need to develop a high-efficiency sampling device for heavy metals in ambient air that has a reasonable structure, stable operation, convenient filter membrane installation and disassembly, and can expand the sampling range. Summary of the Invention
[0003] The purpose of this invention is to provide a high-efficiency sampling device for heavy metals in ambient air that has a reasonable structure, stable operation, convenient filter membrane installation and disassembly, and can expand the sampling range.
[0004] The purpose of this utility model is achieved as follows: it includes a base plate, a lifting mechanism, and a sampling tube assembly. The lifting mechanism is installed on one side of the top surface of the base plate, and an mounting plate is installed on the top of the lifting mechanism. The sampling tube assembly includes a sampling box, a collecting cylinder, and a sampling telescopic tube. The collecting cylinder is installed through the mounting plate, and a top plate is installed on the top of the collecting cylinder. A pelletizing mechanism extending into the collecting cylinder is installed on the top plate. The sampling telescopic tubes are evenly distributed on the upper part of the collecting cylinder, and a sampling cone is installed at the end of the sampling telescopic tube. A conical guide tube is installed at the bottom of the collecting cylinder, and a gas guiding hose is provided at the bottom of the conical guide tube. The sampling box is installed on the base plate, and a filter bag support is fixedly installed inside the sampling box. A sampling filter bag is movably placed inside the filter bag support. A box cover is movably installed on the top of the sampling box. Multiple sets of bag pressing assemblies for pressing the sampling filter bags are evenly distributed on the bottom surface of the box cover. An air inlet pipe is provided on the top of the box cover, and the air inlet pipe is movably connected to the gas guiding hose. An exhaust pipe is provided at the bottom of the sampling box, and an air pump is provided on the exhaust pipe.
[0005] Compared with existing technologies, this device has the following advantages: First, it optimizes the structure of the sampling tube assembly. The sampling telescopic tube adopts a telescopic structure, and its length can be adjusted in a timely manner. By adjusting the length of the sampling telescopic tube, the sampling range can be adjusted, improving the sampling effect. At the same time, the granulation mechanism set inside the collecting cylinder can granulate the heavy metals in the air. After the heavy metals in the air are processed by the granulation mechanism, the particle size of the heavy metals after sampling is reduced. The smaller particle size of the heavy metals is easier to collect by the sampling filter bag and helps to improve the accuracy of subsequent detection. Second, it optimizes the installation structure of the sampling filter bag. The sampling filter bag is installed vertically in the sampling box, which can expand the collection range of heavy metals by the sampling filter bag and can completely capture heavy metals in the air. At the same time, the sampling bag pressing assembly presses and fixes the sampling filter bag, which can improve the stability of the sampling filter bag installation and prevent the sampling filter bag from falling off. On the other hand, the structure of the sampling bag pressing assembly makes the installation and removal of the sampling filter bag more convenient and easier, which can save a lot of bag removal time and improve sampling efficiency. This device has the advantages of reasonable structure, high sampling efficiency, and good performance, and is easy to promote and use. Attached Figure Description
[0006] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of the converging cylinder 4 in this utility model; Figure 3 for Figure 1 An enlarged schematic diagram of part A in the middle; In the diagram: 1-Base plate, 2-Mounting plate, 3-Sampling box, 4-Gathering cylinder, 5-Sampling telescopic tube, 6-Top plate, 7-Sampling cone, 8-Conical duct, 9-Air guide hose, 10-Filter bag support, 11-Sampling filter bag, 12-Box cover, 13-Inlet pipe, 14-Exhaust pipe, 15-Air pump, 16-Pressure plate, 17-Counterweight, 18-Limiting plate, 19-Moving plate, 20-Moving guide rod, 21-Spring, 22-Clamping block, 23-Support ring plate, 24-Sealed outer shell, 25-First motor, 26-Shaft, 27-Blade, 28-Fixed cylinder, 29-Lifting rod, 30-Cylinder cover, 31-Partition plate, 32-Adjusting screw, 33-Lifting slide plate, 34-Second motor, 35-Walking wheel assembly, 36-Push handle. Detailed Implementation
[0007] The present invention will be further described below with reference to the accompanying drawings, but this description is not intended to limit the present invention in any way. Any changes or improvements made based on the teachings of the present invention shall fall within the protection scope of the present invention.
[0008] like Figures 1-3As shown, this utility model includes a base plate 1, a lifting mechanism, and a sampling tube assembly. The lifting mechanism is installed on one side of the top surface of the base plate 1, and an mounting plate 2 is installed on the top of the lifting mechanism. The lifting mechanism can drive the mounting plate 2 to move up and down, facilitating the adjustment of the sampling height of the sampling tube assembly. The sampling tube assembly includes a sampling box 3, a collecting cylinder 4, and a sampling telescopic tube 5. The sampling telescopic tube 5 can be adjusted in length, facilitating the adjustment of the sampling range. The collecting cylinder 4 is installed through the mounting plate 2, and a top plate 6 is installed on the top of the collecting cylinder 4. A pelletizing mechanism extending into the collecting cylinder 4 is installed on the top plate 6. The pelletizing mechanism can shear the sampled air to further refine the metal particles in the air. The sampling telescopic tubes 5 are evenly distributed on the upper part of the collecting cylinder 4, and a sampling cone shroud 7 is installed at the end of the sampling telescopic tube 5. A conical guide tube 8 is installed at the bottom of the collecting cylinder 4. A gas guiding hose 9 is provided. The sampling box 3 is installed on the base plate 1. A filter bag support 10 is fixedly installed inside the sampling box 3. The structure of the filter bag support 10 matches that of the sampling filter bag 11 to ensure that the filter bag is kept open. The sampling filter bag 11 is movably placed inside the filter bag support 10. The sampling filter bag 11 is designed as an open bag structure to increase the sampling capture range and can better capture heavy metal particles in the air. The sampling filter bag is made of filter membrane materials such as glass fiber, quartz fiber and polytetrafluoroethylene (PTFE) used in the prior art. A box cover 12 is movably installed on the top of the sampling box 3. Multiple sets of bag pressing assemblies for pressing the sampling filter bag 11 are evenly distributed on the bottom surface of the box cover 12. An air inlet pipe 13 is provided on the top of the box cover 12. The air inlet pipe 13 is movably connected to the gas guiding hose 9. An exhaust pipe 14 is provided at the bottom of the sampling box 3. An air pump 15 is provided on the exhaust pipe 14.
[0009] The working process of this device is as follows: The device is placed in the air environment to be sampled. The lifting mechanism drives the mounting plate 2 and the collecting cylinder 4 to rise and fall. After adjusting to the required sampling height, the lifting mechanism stops. The length of the sampling telescopic tube 5 is adjusted. By adjusting the length of the sampling telescopic tube 5, the sampling range can be adjusted. After the length of the sampling telescopic tube 5 is adjusted, the air pump 15 is turned on. Under the suction action of the air pump 15, air will enter the collecting cylinder 4 through multiple sampling cones 7 and the sampling telescopic tube 5. Once the air enters the collecting cylinder 4, the granulation mechanism is activated. The granulation mechanism can cut the heavy metal particles in the air, further reducing the particle size. After the heavy metals are cut smaller, it is beneficial to improve the accuracy of subsequent detection. After being granulated in the collecting cylinder 4, the air enters the sampling box 3 through the air guide hose 9 and the air inlet pipe 13. After entering the sampling box 3, the air is captured by the sampling filter bag 11, and the heavy metals in the air are trapped in the sampling filter bag 11. The air is then discharged through the exhaust pipe 14. The discharged air enters the corresponding... Inside the absorption bottle, the content of other components is tested. After the air sampling reaches the specified time, the air pump 15 is turned off, and the box cover 12 is opened. After the box cover 12 is opened, the bag-pressing assembly releases the pressure on the sampling filter bag 11, allowing the sampling filter bag 11 to be easily removed from the filter bag holder 10. After the sampling filter bag 11 is removed, a new sampling filter bag 11 is placed back on the filter bag holder 10, and the box cover 12 is closed. As the box cover 12 is closed, the bag-pressing assembly presses and fixes the sampling filter bag 11 onto the filter bag holder 10, allowing the next step to proceed. In this sampling operation, the sampling filter bag 11 is vertically installed inside the sampling box 3, which expands the capture range of heavy metals by the sampling filter bag 11 and can completely capture heavy metals in the air. At the same time, the sampling bag pressing assembly presses and fixes the sampling filter bag 11, which on the one hand improves the stability of the sampling filter bag 11 installation and prevents the sampling filter bag 11 from falling off. On the other hand, the structure of the sampling bag pressing assembly makes the installation and removal of the sampling filter bag 11 more convenient and easier, which can save a lot of bag removal time and improve sampling efficiency.
[0010] Furthermore, to improve ease of use, the bag-pressing assembly includes a pressing plate 16, a counterweight 17, a limiting plate 18, a movable plate 19, and a movable guide rod 20. The limiting plate 18 is fixedly installed on the inner wall of the sampling box 3, and symmetrical limiting holes are machined on the limiting plate 18. The movable guide rod 20 is slidably installed in the limiting holes. The pressing plate 16 is fixedly installed on the lower end of the movable guide rod 20. Upper teeth are provided on the bottom surface of the pressing plate 16, and the top surface of the filter bag support 10... The sampling filter bag 11 is provided with upper teeth, which press the sampling filter bag 11 between the upper and lower teeth to prevent it from sliding. The movable plate 19 is installed on the upper end of the movable guide rod 20. A spring 21 is installed between the movable plate 19 and the limiting plate 18. The counterweight 17 is installed on the bottom surface of the box cover 12. The bottom of the counterweight 17 is equipped with a pressing block 22 that slides in contact with the movable plate 19. After the sampling filter bag 11 is installed in the filter bag support 10, the box cover 12 closes on the sampling filter bag 11. When the box 3 is at its top, due to the action of the counterweight 17, the counterweight 17 and the pressing block 22 move downwards. When the pressing block 22 contacts the movable plate 19, the spring 21 is compressed, and the movable plate 19, the movable guide rod 20, and the pressing plate 16 move downwards. The pressing plate 16 moves downwards and contacts the sampling filter bag 11, thus pressing and fixing the edge of the sampling filter bag 11 to the edge of the filter bag support 10, thereby achieving the pressing of the sampling filter bag 11. After the sampling filter bag 11 has made contact with the sample, the box is opened upwards. When the cover 12 is pulled upward, the counterweight 17 and the pressing block 22 move upward and do not contact the movable plate 19. The spring 21 extends, and the movable plate 19, the movable guide rod 20 and the pressing plate 16 move upward. The pressing plate 16 moves upward and does not contact the sampling filter bag 11, so the sampling filter bag 11 can be quickly removed from the filter bag support 10. Preferably, in order to improve the pressing effect of the pressing block 22 on the sampling filter bag 11, the bottom surface of the pressing block 22 is set as an arc-shaped structure with a low middle and a high edge.
[0011] Preferably, in order to improve the sealing performance between the lid 12 and the sampling box 3 and prevent heavy metals in the air from escaping from the gap between them and affecting the accuracy of the detection, a support ring plate 23 is fixedly installed on the outer wall of the upper part of the sampling box 3. An annular slot is machined on the top surface of the support ring plate 23. A sealing shell 24 that fits into the sampling box 3 is installed on the bottom edge of the lid 12. The lower end of the sealing shell 24 is inserted into the annular slot. This connection method enhances the sealing performance between the lid 12 and the sampling box 3.
[0012] Furthermore, to improve the convenience of adjusting the length of the sampling telescopic tube 5, the sampling telescopic tube 5 includes a fixed tube, a movable tube, and an adjusting sleeve. The outer walls of the fixed tube and the movable tube are machined with external threads, and the inner wall of the adjusting sleeve is machined with external threads. The fixed tube and the movable sleeve are respectively threaded to both ends inside the adjusting sleeve. One end of the fixed tube is fixedly connected to the converging cylinder 4, and the other end of the movable tube is fixedly connected to the sampling cone 7. In use, by rotating the adjusting sleeve, the movable tube can reciprocate within the adjusting sleeve, thereby adjusting the installation length of the movable tube within the adjusting sleeve and thus achieving the adjustment of the length of the sampling telescopic tube 5.
[0013] Furthermore, the pelletizing mechanism includes a first motor 25 and a rotating shaft 26. The rotating shaft 26 is vertically rotatably mounted on the top plate 6, and multiple blades 27 are evenly distributed on the rotating shaft 26. The first motor 25 is mounted above the top plate 6 and is connected to the rotating shaft 26 for transmission. A housing is provided on the outside of the first motor 25, and a ventilation hole is provided on the housing. The first motor 25 is a structure used in the prior art. When in use, the first motor 25 is turned on, and the first motor 25 drives the rotating shaft 26 to rotate. The rotating shaft 26 drives the blades to rotate. During the rotation process, the blades can shear the heavy metal particles in the air, cutting the heavy metal particles into smaller pieces. This is beneficial to improving the accuracy of subsequent heavy metal detection.
[0014] Furthermore, to facilitate the adjustment of the sampling height of the sampling telescopic tube 5, the lifting mechanism includes a fixed cylinder 28 and a lifting rod 29. A cylinder cover 30 is installed on the top of the fixed cylinder 28, and a partition 31 is installed in the lower part of the fixed cylinder 28. An adjusting screw 32 is rotatably installed between the partition 31 and the cylinder cover 30. A lifting slide plate 33 is installed on the adjusting screw 32. Vertical grooves are symmetrically machined on the inner wall of the fixed cylinder 28. A guide slider corresponding to the vertical groove is installed on the lifting slide plate 33. The guide slider is slidably installed in the vertical groove. Guide holes are symmetrically machined on the cylinder cover 30. The lifting rod 29 is slidably installed in the guide holes. The lower end of the lifting rod 29 is fixedly connected to the lifting slide plate 33, and the upper end of the lifting rod 29 is connected to the mounting plate 2. The partition 31... A second motor 34 is installed inside the square fixed cylinder 28. The second motor 34 is a structure used in the prior art. The finished product is purchased directly according to the power required. The output shaft of the second motor 34 is connected to the adjusting screw 32. Ventilation holes are installed on the fixed cylinder 28 below the partition plate 31. When in use, the second motor 34 is turned on, which drives the adjusting screw 32 to rotate. The rotation of the adjusting screw 32 will drive the lifting slide plate 33 to rise or fall along the adjusting screw 32. During the rise or fall of the adjusting screw 32, the lifting rod 29 also rises or falls, thereby realizing the lifting and lowering of the mounting plate 2 and the collecting cylinder 4, thus realizing the adjustment of the sampling height of the sampling telescopic tube 5. After the structure of the sampling telescopic tube 5 is adjusted, the second motor 34 is turned off.
[0015] Furthermore, to improve the practicality of this device, a walking wheel assembly 35 is installed on the bottom surface of the base plate 1. The walking wheel assembly 35 can adopt the structure used in the prior art, mainly including the structure of rollers and brakes. A push handle 36 is provided on one side of the base plate 1. The walking wheel assembly 35 can facilitate the movement of this device, and the handle 36 can cooperate with the walking wheel assembly 35 to push the device to move, achieving the effect of saving time and effort.
Claims
1. A high-efficiency sampling device for heavy metals in ambient air, comprising a base plate (1), a lifting mechanism, and a sampling tube assembly, characterized in that: The lifting mechanism is installed on one side of the top surface of the base plate (1), and an installation plate (2) is installed on the top of the lifting mechanism. The sampling tube assembly includes a sampling box (3), a collecting cylinder (4), and a sampling telescopic tube (5). The collecting cylinder (4) is installed through the installation plate (2). A top plate (6) is installed on the top of the collecting cylinder (4). A pelletizing mechanism extending into the collecting cylinder (4) is installed on the top plate (6). The sampling telescopic tubes (5) are evenly distributed on the upper part of the collecting cylinder (4). A sampling cone cover (7) is installed at the end of the sampling telescopic tube (5). A conical guide tube (8) is installed at the bottom of the collecting cylinder (4). The bottom of the conical guide tube (8) is provided with The sampling box (3) is mounted on a base plate (1) with a gas guiding hose (9). A filter bag support (10) is fixedly installed inside the sampling box (3). A sampling filter bag (11) is movably placed inside the filter bag support (10). A box cover (12) is movably installed on the top of the sampling box (3). Multiple sets of bag pressing assemblies for pressing the sampling filter bag (11) are evenly distributed on the bottom surface of the box cover (12). An air inlet pipe (13) is provided on the top of the box cover (12). The air inlet pipe (13) is movably connected to the gas guiding hose (9). An exhaust pipe (14) is provided at the bottom of the sampling box (3). An air pump (15) is provided on the exhaust pipe (14).
2. The high-efficiency sampling device for heavy metals in ambient air according to claim 1, characterized in that: The bag pressing assembly includes a pressing plate (16), a counterweight (17), a limiting plate (18), a movable plate (19), and a movable guide rod (20). The limiting plate (18) is fixedly installed on the inner wall of the sampling box (3). The limiting plate (18) has symmetrical limiting holes. The movable guide rod (20) is slidably installed in the limiting holes. The pressing plate (16) is fixedly installed at the lower end of the movable guide rod (20). The bottom surface of the pressing plate (16) is provided with upper teeth. The top surface of the filter bag support (10) is provided with upper teeth. The movable plate (19) is installed at the upper end of the movable guide rod (20). A spring (21) is installed between the movable plate (19) and the limiting plate (18). The counterweight (17) is installed on the bottom surface of the box cover (12). The bottom of the counterweight (17) is provided with a pressing block (22) that slides in contact with the movable plate (19).
3. The high-efficiency sampling device for heavy metals in ambient air according to claim 2, characterized in that: The bottom surface of the clamping block (22) is configured as an arc-shaped structure with a low center and a high edge.
4. The high-efficiency sampling device for heavy metals in ambient air according to claim 1, characterized in that: A support ring plate (23) is fixedly installed on the outer wall of the upper part of the sampling box (3). An annular slot is machined on the top surface of the support ring plate (23). A sealing shell (24) that fits the sampling box (3) is installed on the bottom edge of the box cover (12). The lower end of the sealing shell (24) is inserted into the annular slot.
5. The high-efficiency sampling device for heavy metals in ambient air according to claim 1, characterized in that: The sampling telescopic tube (5) includes a fixed tube, a movable tube and an adjusting sleeve. The outer walls of the fixed tube and the movable tube are both machined with external threads, and the inner wall of the adjusting sleeve is machined with external threads. The fixed tube and the movable sleeve are respectively threaded to the two ends inside the adjusting sleeve. One end of the fixed tube is fixedly connected to the converging cylinder (4), and the other end of the movable tube is fixedly connected to the sampling cone (7).
6. The high-efficiency sampling device for heavy metals in ambient air according to claim 1, characterized in that: The pelletizing mechanism includes a first motor (25) and a rotating shaft (26). The rotating shaft (26) is vertically rotatably mounted on the top plate (6). Multiple blades (27) are evenly distributed on the rotating shaft (26). The first motor (25) is mounted above the top plate (6) and is connected to the rotating shaft (26) for transmission. A housing is provided on the outside of the first motor (25), and ventilation holes are provided on the housing.
7. The high-efficiency sampling device for heavy metals in ambient air according to claim 1, characterized in that: The lifting mechanism includes a fixed cylinder (28) and a lifting rod (29). A cylinder cover (30) is installed on the top of the fixed cylinder (28). A partition (31) is installed in the lower part of the fixed cylinder (28). An adjusting screw (32) is rotatably installed between the partition (31) and the cylinder cover (30). A lifting slide plate (33) is installed on the adjusting screw (32). Vertical grooves are symmetrically machined on the inner wall of the fixed cylinder (28). A guide slider corresponding to the vertical groove is installed on the lifting slide plate (33). The slider is slidably installed in the vertical groove. The cylinder cover (30) has symmetrically machined guide holes. The lifting rod (29) is slidably installed in the guide holes. The lower end of the lifting rod (29) is fixedly connected to the lifting slide plate (33). The upper end of the lifting rod (29) is connected to the mounting plate (2). The second motor (34) is installed in the fixed cylinder (28) below the partition (31). The output shaft of the second motor (34) is connected to the adjusting screw (32) for transmission. The fixed cylinder (28) below the partition (31) is equipped with ventilation holes.
8. The high-efficiency sampling device for heavy metals in ambient air according to claim 1, characterized in that: A walking wheel assembly (35) is installed on the bottom surface of the base plate (1), and a push handle (36) is provided on one side of the base plate (1).