Portable charging pile on-site calibrator

Abstract

The application provides a portable charging pile on-site calibrator, which comprises an instrument main body, the instrument main body comprises a shell, a load mechanism, a cover plate and a reinforcing column, the load mechanism is fixedly installed in the shell, the reinforcing column is fixedly installed on the outer wall of the shell, and the telescopic mechanism is movably sleeved in the reinforcing column. The built-in load group can simulate the actual working state of the charging pile, improve the detection efficiency and ensure the data accuracy, solve the high-power test demand, effectively solve the heat dissipation problem through the setting of the load group and forced air circulation, prolong the service life of the equipment, avoid data drift or test interruption caused by overheating, set the telescopic mechanism for supporting the calibrator, conveniently move the calibrator when a large number of calibrations are carried out, solve the problem of frequent bending and operation, and store the telescopic mechanism after use, improve the use performance of the charging pile calibrator, and make the calibrator adapt to the efficient calibration work demand of outdoor scenes.

Description

Technical Field

[0001] This invention relates to a portable charging pile on-site verification instrument, belonging to the technical field of charging pile verification instruments. Background Technology

[0002] A charging pile calibrator is a professional device used to test and evaluate the performance of electric vehicle charging piles. Its core function is to ensure that the electrical parameters, safety performance, and metrological accuracy of the charging piles meet national standards through high-precision measurement and analysis. It can measure key parameters such as voltage, current, power, and energy error of the charging pile, and supports the testing of both AC and DC charging piles. It can also analyze ripple below 1kHz to assess charging stability. In addition, the charging pile calibrator also has functions such as insulation resistance testing, temperature / humidity monitoring, and GPS clock calibration. Some models can even simulate BMS protocols (DC charging piles) or vehicle guidance circuits to comprehensively verify the compatibility and safety of the charging piles.

[0003] Charging pile calibrators are professional devices used to test the electrical performance of charging piles. Currently, most calibrators combine the instrument and load to improve their convenience. However, prolonged high-current testing can lead to high internal temperatures, especially during outdoor testing in hot weather. Testing a large number of charging piles may cause the calibrator to be damaged by high temperatures, seriously affecting its lifespan. Furthermore, due to the long distances between charging piles, continuous testing requires frequent handling and bending over, which affects the convenience of operation and increases the labor intensity of the calibration personnel, impacting the ease of use of the calibrator. On the other hand, the supporting structure can also affect the portability of the calibrator. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, the present invention provides a portable charging pile on-site verification instrument.

[0005] The present invention solves the above-mentioned technical problems through the following technical solutions:

[0006] This invention provides a portable charging pile on-site verification instrument, including an instrument body. The instrument body includes a shell, a load mechanism, a cover plate, and a reinforcing column. The load mechanism is fixedly installed inside the shell. The cover plate is hinged to the top of the instrument body. The reinforcing column is fixedly installed on the outer wall of the shell. A telescopic mechanism is movably sleeved inside the reinforcing column.

[0007] The load mechanism includes a mounting plate, a surrounding plate, and a load assembly. The mounting plate is fixedly connected to the inside of the housing. The mounting plate is correspondingly disposed below the partition. The bottom of the mounting plate is fixedly connected to the surrounding plate. The inside of the surrounding plate is fixedly connected to the load assembly through a support column.

[0008] The telescopic mechanism includes a sleeve rod and a support rod. The sleeve rod is movably sleeved inside the reinforcing column, and the support rod is movably sleeved inside the sleeve rod. The bottom end of the support rod is provided with a roller.

[0009] In this technical solution, the edge of the housing is provided with a protruding edge, the housing is fitted and connected to the cover plate, the edge of the cover plate is provided with an adhesive strip, and the adhesive strip is embedded and connected to the protruding edge of the housing edge.

[0010] In this technical solution, an interactive panel is fixedly installed inside the top of the housing, and a partition is fixedly installed inside the top of the housing, with the partition correspondingly positioned below the interactive panel.

[0011] In this technical solution, an airflow cavity is formed between the enclosure and the shell, and an airflow passage cavity is formed between the enclosure and the load group. The load group consists of multiple load units with gaps between adjacent load units. An air intake mechanism is fixedly installed at the bottom of the enclosure. The air intake mechanism includes a flow guide and a fan. The flow guide is fixedly connected to the bottom of the enclosure. A fan is fixedly installed in the middle of the flow guide. Uniformly distributed air holes are opened at the bottom of the enclosure. Multiple square holes are opened on the surface of the mounting plate, and the square holes are distributed corresponding to the gaps and cavities.

[0012] In this technical solution, the sidewall of the housing has two air inlets and two air outlets, which are distributed sequentially on adjacent surfaces of the housing. The air inlets are located below the mounting plate, and the air outlets are located above the mounting plate.

[0013] In this technical solution, an electric push rod is fixedly installed on the edge of the mounting plate, the telescopic end of the electric push rod is fixedly connected to the square plate, the square plate is movably sleeved onto the surface of the load group, a flow channel is formed between the square plate and the surrounding plate, the square plate is disposed in the cavity between the surrounding plate and the load group, and the side wall of the surrounding plate has an inclined structure.

[0014] In this technical solution, there are four reinforcing columns, with two reinforcing columns symmetrically arranged on both sides of the shell, and each reinforcing column is movably fitted with a telescopic mechanism.

[0015] In this technical solution, a countersunk hole is provided inside the top of the sleeve rod, and a positioning pin is connected to the countersunk hole through a return spring. The positioning pin is movably sleeved inside the countersunk hole, and a positioning hole is provided at the bottom of the reinforcing column.

[0016] In this technical solution, there are four sleeve rods and four support rods. The bottom ends of the four sleeve rods and the bottom ends of the four support rods are connected in sequence by crossbars, and the crossbars on the sleeve rods and support rods are distributed vertically and vertically.

[0017] In this technical solution, the bottom end of the reinforcing column extends to the bottom of the housing, and a hook is rotatably connected to the side wall of the reinforcing column. The top end of the hook is connected to the reinforcing column. The hook has an L-shaped structure and is located on one side of the crossbar. The hook is connected to the side wall of the reinforcing column through a connecting spring. The bottom end of the hook is fixedly connected to a pull rope. The other end of the pull rope is connected to a handle. The handle fits against the outer side wall of the housing, and both ends of the handle extend into the elongated holes opened in the reinforcing column.

[0018] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0019] The positive and progressive effects of this invention are as follows:

[0020] The portable charging pile field calibrator proposed above can simulate the actual working state of charging piles through its built-in load group, improving testing efficiency and ensuring data accuracy. It solves the high-power testing requirements and effectively solves the heat dissipation problem through the setting of the load group and forced air circulation, avoiding the problem of high temperature damage caused by long-term operation. It can work continuously in high-temperature environments, which not only extends the service life of the equipment, but also avoids data drift or test interruption caused by overheating. A telescopic mechanism is set up for the support of the calibrator, making it easy to move during batch calibration, solving the problem of frequent bending and operation. After use, the telescopic mechanism can be stored without affecting the normal carrying of the calibrator, improving the performance of the charging pile calibrator. It enables the calibrator to meet the high-efficiency calibration operation requirements in outdoor scenarios while ensuring testing accuracy. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the internal front view of the present invention.

[0023] Figure 3 This is a three-dimensional structural diagram of the load group of the present invention.

[0024] Figure 4 This is a three-dimensional structural diagram of the air guide cover of the present invention.

[0025] Figure 5 This is a partial three-dimensional structural diagram of the housing of the present invention.

[0026] Figure 6 This is a three-dimensional structural diagram of the reinforcing column of the present invention.

[0027] Figure 7 For the present invention Figure 6 A magnified schematic diagram of the structure at point A in the middle.

[0028] Figure 8 This is a three-dimensional structural diagram of the crossbar of the present invention.

[0029] Figure 9 For the present invention Figure 8 A magnified schematic diagram of the structure at point B in the middle.

[0030] Figure 10 This is a three-dimensional structural diagram of the support rod of the present invention.

[0031] Explanation of reference numerals in the attached figures

[0032] 10. Instrument body; 11. Housing; 111. Air inlet; 112. Interaction panel; 113. Partition; 114. Air outlet; 115. Support leg; 116. Flow guide plate; 21. Mounting plate; 211. Enclosure; 212. Flow guide shroud; 213. Fan; 214. Load group; 215. Spacing; 216. Electric push rod; 217. Square plate; 218. Flow channel; 219. Square hole; 31 311. Cover plate; 312. Handle; 413. Rubber strip; 414. Reinforcing post; 415. Sleeve rod; 416. Support rod; 417. Countersunk hole; 418. Return spring; 419. Positioning pin; 420. Insertion hole; 411. Hook; 421. Connecting spring; 422. Pull rope; 423. Handle; 424. Long hole; 425. Roller; 426. Crossbar; 427. Positioning hole; 428. Knob. Detailed Implementation

[0033] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0034] like Figure 1-10 As shown, the portable charging pile on-site verification instrument includes an instrument body 10. The instrument body 10 includes a housing 11, a load mechanism, a cover plate 31, and a reinforcing column 41. The load mechanism is fixedly installed inside the housing 11. The cover plate 31 is hinged to the top of the instrument body 10. The reinforcing column 41 is fixedly installed on the outer wall of the housing 11. A telescopic mechanism is movably sleeved inside the reinforcing column 41. A roller 422 is provided below the telescopic mechanism. The instrument body 10 can be moved by setting the roller 422, which allows the instrument body 10 to be moved during on-site verification.

[0035] The housing 11 has a raised edge, and the housing 11 is fitted and connected to the cover plate 31. The cover plate 31 has an adhesive strip 312 on its edge, and the adhesive strip 312 is fitted and connected to the raised edge of the housing 11. When the cover plate 31 is closed, the cover plate 31 can drive the adhesive strip 312 to fit into the raised edge of the housing 11, thereby achieving a seal at the connection between the housing 11 and the cover plate 31.

[0036] An interactive panel 112 is fixedly installed inside the top of the housing 11. The interactive panel 112 is equipped with a display screen, control buttons and a charging pile slot. The charging pile slot is provided with a cover. When the charging pile is calibrated, the plug of the charging pile is inserted into the charging pile slot of the housing 11, and the circuit is connected for circuit calibration of the charging pile.

[0037] A partition 113 is fixedly installed inside the top of the housing 11. The partition 113 is correspondingly arranged below the interactive panel 112. The partition 113 can separate the control circuit board on the interactive panel 112, so that the various circuit devices on the interactive panel 112 will not be affected.

[0038] The bottom of the housing 11 is fixedly equipped with support legs 115, which can support the housing 11. A guide plate 116 is fixedly connected inside the bottom end of the housing 11. The guide plate 116 is inclinedly arranged around the housing 11 and is located below the load mechanism. A notch is opened at the bottom of the housing 11 outside the guide plate 116. In this way, airflow can be achieved between the guide plate 116 and the load mechanism, while rainwater that may enter from the outside can be blocked by the guide plate 116 and discharged through the notch, thus avoiding water ingress into the housing 11.

[0039] The load mechanism includes a mounting plate 21, a surrounding plate 211, and a load assembly 214. The mounting plate 21 is fixedly connected to the interior of the housing 11. The mounting plate 21 is correspondingly disposed below the partition 113. The bottom of the mounting plate 21 is fixedly connected to the surrounding plate 211. The interior of the surrounding plate 211 is fixedly connected to the load assembly 214 via a support column. An airflow cavity is formed between the surrounding plate 211 and the housing 11. An airflow hole is formed between the surrounding plate 211 and the load assembly 214. An air intake mechanism is fixedly installed at the bottom of the surrounding plate 211.

[0040] The air intake mechanism includes a flow guide 212 and a fan 213. The flow guide 212 is fixedly connected to the bottom of the enclosure 211. The fan 213 is fixedly installed in the middle of the flow guide 212. The bottom of the enclosure 211 has evenly distributed air holes. By setting the air holes, the airflow can enter the interior of the enclosure 211 evenly. The load group 214 is supported by a support column, so that the bottom of the load group 214 can still achieve air circulation.

[0041] The mounting plate 21 has a plurality of square holes 219 on its surface. The square holes 219 are distributed corresponding to the intervals 215 and the cavity, respectively. The square holes 219 located at the edge are arranged above the cavity formed by the surrounding plate 211 and the load group 214. In this way, when air flows from the intervals 215 of the load group 214, the airflow can be transported to the top of the mounting plate 21 through the square holes 219.

[0042] The load group 214 consists of multiple load units, with a gap 215 between adjacent load units. When the fan 213 starts, outside air enters through the air inlet 111, passes through the cavity between the housing 11 and the enclosure 211, and then enters the air guide shroud 212. The air guide shroud 212 evenly distributes the airflow to the bottom of the enclosure 211, and then enters the interior of the enclosure 211 through the air holes at the bottom of the enclosure 211. The airflow is evenly distributed to the gap 215 and carries the high temperature of the load during operation, which is discharged from the square hole 219 at the mounting plate 21 and discharged to the outside through the air outlet 114. The air inlet 111 and the air outlet 114 are located on different sides of the housing 11, which does not affect the heat dissipation effect and allows the airflow to be evenly distributed among multiple loads for heat dissipation.

[0043] The sidewalls of the housing 11 are respectively provided with two air inlets 111 and two air outlets 114. The air inlets 111 and air outlets 114 are distributed sequentially on adjacent surfaces of the housing 11. The air inlets 111 are located below the mounting plate 21, and the air outlets 114 are located above the mounting plate 21. In this way, the air can achieve unidirectional airflow during the circulation process through the fan 213, and the high temperature at the load group 214 is lifted and transported by the fan 213, ensuring efficient airflow and further improving the heat dissipation effect of the load group 214 during operation. In addition, the cavity formed between the enclosure plate 211 and the housing 11 can further improve the protective performance of the load group 214 and enhance its anti-collision and anti-impact performance.

[0044] An electric push rod 216 is fixedly mounted on the edge of the mounting plate 21. The telescopic end of the electric push rod 216 is fixedly connected to the square plate 217. The square plate 217 is movably sleeved onto the surface of the load group 214. A flow channel 218 is formed between the square plate 217 and the surrounding plate 211. The square plate 217 is disposed in the cavity between the surrounding plate 211 and the load group 214. The side wall of the surrounding plate 211 has an inclined structure. Thus, when the electric push rod 216 drives the square plate 217 to rise and fall, the square plate 217 controls the size of the flow channel 218 in the cavity, and the airflow can be adjusted according to the heat dissipation requirements. In terms of flow efficiency, specifically, when the temperature inside the cavity is higher than the temperature at interval 215, the electric push rod 216 shortens, causing the square plate 217 to rise, increasing the width of the flow channel 218, allowing more airflow to pass through the flow channel 218. When the temperature inside the cavity is lower than the temperature at interval 215, the electric push rod 216 extends, causing the square plate 217 to fall, decreasing the width of the flow channel 218. At this time, more airflow passes through the interval 215 between the load groups 214. The airflow direction can be controlled according to the heated position of the load group 214, further improving the heat dissipation effect of the load group 214.

[0045] A handle 311 is fixedly installed on the top of the cover plate 31. One end of the cover plate 31 is provided with a latch that is connected to the protrusion of the edge of the housing 11. When the cover plate 31 is closed, the latch enables the connection between the cover plate 31 and the housing 11, and drives the rubber strip 312 to fit into the top edge of the housing 11, thereby achieving a seal between the cover plate 31 and the housing 11.

[0046] There are four reinforcing columns 41, with two reinforcing columns 41 symmetrically arranged on both sides of the housing 11. Each reinforcing column 41 has a telescopic mechanism movably sleeved inside it. The telescopic mechanism includes a sleeve rod 411 and a support rod 412. The sleeve rod 411 is movably sleeved inside the reinforcing column 41, and the support rod 412 is movably sleeved inside the sleeve rod 411. In this way, the reinforcing columns 41 can improve the structural strength of the housing 11, and the arrangement of the sleeve rod 411 and the support rod 412 can support the housing 11. When carrying, the sleeve rod 411 and the support rod 412 can be retracted to achieve storage, making it convenient to carry. When performing on-site verification, the sleeve rod 411 and the support rod 412 can be extended to support the housing 11. At this time, there is no need to bend over to perform plugging and unplugging operations, which facilitates the short-distance movement of the verification instrument between charging piles and improves the convenience of use.

[0047] The top of the sleeve rod 411 has a countersunk hole 413. The countersunk hole 413 is connected to the positioning pin 415 through a return spring 414. The positioning pin 415 is movably sleeved inside the countersunk hole 413. The bottom of the reinforcing column 41 has a positioning hole 424. When the sleeve rod 411 moves, the positioning pin 415 moves synchronously inside the reinforcing column 41. When the positioning pin 415 moves to the positioning hole 424, the return spring 414 pushes the positioning pin 415 out, thereby limiting the sleeve rod 411. When storing, simply press the positioning pin 415 into the countersunk hole 413, and the sleeve rod 411 moves into the reinforcing column 41 to be stored.

[0048] There are four sleeve rods 411 and four support rods 412. The bottom ends of the four sleeve rods 411 and the bottom ends of the four support rods 412 are connected in sequence by crossbars 423. The crossbars 423 on the sleeve rods 411 and the support rods 412 are arranged vertically and vertically. In this way, by setting the crossbars 423, the structural strength of the sleeve rods 411 and the support rods 412 can be improved, so that the sleeve rods 411 and the support rods 412 will not bend or deform when the housing 11 is pushed to move.

[0049] The bottom end of the support rod 412 is provided with a roller 422. The roller 422 enables convenient movement of the calibrator. When the support rod 412 is retracted, the roller 422 is positioned above the bottom surface of the support leg 115, at which time the support leg 115 supports the housing 11.

[0050] The bottom end of the reinforcing column 41 extends to the bottom of the housing 11. A hook 417 is rotatably connected to the side wall of the reinforcing column 41. The top end of the hook 417 is connected to the reinforcing column 41. The hook 417 has an L-shaped structure and is located on one side of the crossbar 423. The hook 417 is connected to the side wall of the reinforcing column 41 through a connecting spring 418. The bottom end of the hook 417 is fixedly connected to the pull rope 419. The other end of the pull rope 419 is connected to the handle 420. The handle 420 fits against the outer wall of the housing 11. Both ends of the handle 420 extend into the elongated hole 421 opened in the reinforcing column 41. The elongated hole 421 is provided for stable movement during lifting. The upward movement of the handle 420 can cause the pull rope 419 to pull the hook 417 to rotate, causing the hook 417 to separate from the crossbar 423. At this time, the sleeve rod 411 and the support rod 412 are unrestricted, thereby allowing the sleeve rod 411 and the support rod 412 to extend.

[0051] The bottom end of the sleeve rod 411 is threadedly connected to the knob 425, and the top end of the support rod 412 is provided with an insertion hole 416. When the support rod 412 is lowered, the knob 425 is tightened inside the insertion hole 416 to limit the position of the support rod 412.

[0052] In specific operation, after closing the cover plate 31, the housing 11 can be easily moved using the handle 311. During on-site verification, pull the handle 420 with both hands to move the handle 420 upwards. The handle 420 moves the hook 417 by pulling the rope 419. The hook 417 overcomes the tension of the connecting spring 418 and separates from the crossbar 423. The sleeve rod 411 and the support rod 412 extend. The positioning pin 415 is inserted into the positioning hole 424 to limit the sleeve rod 411. After the support rod 412 extends, tighten the knob 425 into the insertion hole 416 to limit the support rod 412. At this time, the roller 422 contacts the ground, thereby supporting the housing 11. During on-site verification, the housing 11 can be pushed to move the roller 422 for short-distance movement of the calibrator, eliminating the need for frequent bending over and improving the ease of use of the calibrator.

[0053] This invention is not limited to the embodiments described above. Any changes in shape or structure shall fall within the protection scope of this invention. The protection scope of this invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of this invention, but all such changes and modifications shall fall within the protection scope of this invention.

Claims

1. A portable charging pile on-site verification instrument, comprising an instrument body (10), characterized in that, The instrument body (10) includes a shell (11), a load mechanism, a cover plate (31) and a reinforcing column (41). The load mechanism is fixedly installed inside the shell (11). The cover plate (31) is hinged to the top of the instrument body (10). The reinforcing column (41) is fixedly installed on the outer wall of the shell (11). A telescopic mechanism is movably sleeved inside the reinforcing column (41). The load mechanism includes a mounting plate (21), a surrounding plate (211), and a load assembly (214). The mounting plate (21) is fixedly connected to the inside of the housing (11). The mounting plate (21) is correspondingly arranged below the partition (113). The bottom of the mounting plate (21) is fixedly connected to the surrounding plate (211). The inside of the surrounding plate (211) is fixedly connected to the load assembly (214) through a support column. The telescopic mechanism includes a sleeve rod (411) and a support rod (412). The sleeve rod (411) is movably sleeved inside the reinforcing column (41). The support rod (412) is movably sleeved inside the sleeve rod (411). The bottom end of the support rod (412) is provided with a roller (422).

2. The portable charging pile on-site verification instrument as described in claim 1, characterized in that: The shell (11) has a raised edge, the shell (11) is fitted and connected to the cover plate (31), the cover plate (31) has an adhesive strip (312) on its edge, and the adhesive strip (312) is fitted and connected to the raised edge of the shell (11).

3. The portable charging pile on-site verification instrument as described in claim 1, characterized in that: An interactive panel (112) is fixedly installed inside the top of the housing (11), and a partition (113) is fixedly installed inside the top of the housing (11), with the partition (113) correspondingly positioned below the interactive panel (112).

4. The portable charging pile on-site verification instrument as described in claim 1, characterized in that: A cavity for airflow is formed between the enclosure (211) and the shell (11). A cavity with airflow holes is formed between the enclosure (211) and the load group (214). The load group (214) is composed of multiple load units. An interval (215) is formed between adjacent load units. An air intake mechanism is fixedly installed at the bottom of the enclosure (211). The air intake mechanism includes a flow guide (212) and a fan (213). The flow guide (212) is fixedly connected to the bottom of the enclosure (211). A fan (213) is fixedly installed in the middle of the flow guide (212). The bottom of the enclosure (211) is provided with evenly distributed air holes. A plurality of square holes (219) are provided on the surface of the mounting plate (21). The square holes (219) are distributed corresponding to the interval (215) and the cavity, respectively.

5. The portable charging pile on-site verification instrument as described in claim 1, characterized in that: The sidewall of the housing (11) has two air inlets (111) and two air outlets (114), which are distributed sequentially on adjacent surfaces of the housing (11). The air inlets (111) are located below the mounting plate (21), and the air outlets (114) are located above the mounting plate (21).

6. The portable charging pile on-site verification instrument as described in claim 1, characterized in that: An electric push rod (216) is fixedly installed on the edge of the mounting plate (21). The telescopic end of the electric push rod (216) is fixedly connected to the square plate (217). The square plate (217) is movably sleeved onto the surface of the load group (214). A flow channel (218) is formed between the square plate (217) and the surrounding plate (211). The square plate (217) is located in the cavity between the surrounding plate (211) and the load group (214). The side wall of the surrounding plate (211) has an inclined structure.

7. The portable charging pile on-site verification instrument as described in claim 1, characterized in that: The number of reinforcing columns (41) is four, and every two reinforcing columns (41) are symmetrically arranged on both sides of the shell (11). Each reinforcing column (41) is movably fitted with a telescopic mechanism.

8. The portable charging pile on-site verification instrument as described in claim 1, characterized in that: The top of the sleeve (411) has a countersunk hole (413), and the countersunk hole (413) is connected to the positioning pin (415) by a return spring (414). The positioning pin (415) is movably sleeved inside the countersunk hole (413). The bottom of the reinforcing column (41) has a positioning hole (424).

9. The portable charging pile on-site verification instrument as described in claim 1, characterized in that: The number of sleeve rods (411) and support rods (412) is four. The bottom ends of the four sleeve rods (411) and the bottom ends of the four support rods (412) are connected in sequence by crossbars (423), and the crossbars (423) on the sleeve rods (411) and support rods (412) are distributed vertically.

10. The portable charging pile on-site verification instrument as described in claim 1, characterized in that: The bottom end of the reinforcing column (41) extends to the bottom of the housing (11). The side wall of the reinforcing column (41) is rotatably connected to a hook (417). The top end of the hook (417) is connected to the reinforcing column (41). The hook (417) has an L-shaped structure and is set on one side of the crossbar (423). The hook (417) is connected to the side wall of the reinforcing column (41) through a connecting spring (418). The bottom end of the hook (417) is fixedly connected to a pull rope (419). The other end of the pull rope (419) is connected to a handle (420). The handle (420) fits against the outer wall of the housing (11). Both ends of the handle (420) extend into the elongated hole (421) opened in the reinforcing column (41).

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