Pushing chain type lifting operation platform

Abstract

The invention belongs to the technical field of lifting operation platforms, and particularly relates to a pushing chain type lifting operation platform which comprises a pushing chain lifting mast, the pushing chain lifting mast comprises a telescopic mast and a pushing chain driving system, and an operation platform is installed at the top end of the telescopic mast. According to the pushing chain type lifting operation platform, a variable frequency motor drives a pushing chain to conduct high-speed and constant lifting motion, a mast is vertically pushed and driven to ascend and descend, so that the operation platform on the top of the mast is driven to ascend and descend, the operation platform can stop at any height without sliding down, pure mechanical driving is adopted, and the risk of hydraulic oil leakage is avoided; and meanwhile, the problems that the transmission efficiency is low, the lifting speed is low, the speed is not constant, the descending speed is difficult to control, the stopping precision is low, and oil leakage possibly pollutes the environment are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of lifting work platforms, and particularly relates to a push-chain type lifting work platform. Background Art

[0002] A lifting mast is a telescopic lifting system composed of multiple tubular structures, and is often used to raise and lower communication, lighting, monitoring, reconnaissance equipment, etc. Currently, the main types of mast lifting systems include pneumatic masts, electric masts, etc. A pneumatic mast usually includes a gas source, a cylinder, etc., and realizes the lifting movement by compressing and releasing air. An electric mast usually includes a motor, a reduction mechanism, a lead screw, etc., and realizes the lifting movement by the motor driving the lead screw. At present, a problem with pneumatic masts is that the mast will slowly lower over time and cannot fully maintain its position. The problems with current electric masts are slow lifting speed and low load capacity.

[0003] In scenarios such as machinery installation and maintenance, and building construction and maintenance that require high-altitude operations, a scissor-type manned work platform is commonly used. A scissor-type manned work platform usually uses hydraulic drive. When hydraulic oil is pressed into the oil cylinder, the piston moves upward, thereby pushing the scissor arms and causing the scissor mechanism to expand upward, and the work platform rises; when the hydraulic oil returns, under the action of gravity, the piston moves downward, causing the scissor mechanism to contract downward, and the work platform descends. The problems with current scissor-type manned work platforms are that the oil cylinder obliquely pushes the scissor arms, and the thrust is not vertically upward, so several times the load weight must be generated, resulting in low transmission efficiency and waste of energy; using hydraulic drive, the lifting speed is slow and the speed is not constant. Especially when descending, it relies on gravity and the speed is difficult to control; the height may slowly slide down due to gravity, and the stop accuracy is low; moreover, using hydraulic drive also has the risk of hydraulic oil leakage, which may pollute the environment. Summary of the Invention

[0004] The present invention discloses a push-chain type lifting work platform, which is driven by a variable-frequency motor to drive the push chain to perform fast and constant lifting movement, vertically push the mast, drive the mast to lift, thereby driving the work platform at the top of the mast to lift, and can stop at any height without sliding down. It adopts pure mechanical drive, has no risk of hydraulic oil leakage, will not pollute the environment, and at the same time solves the problems of low transmission efficiency, slow lifting speed, non-constant speed, difficult control of descending speed, low stop accuracy, and possible oil leakage and environmental pollution.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A push-chain type lifting work platform, comprising a push-chain lifting mast. The push-chain lifting mast includes a telescopic mast and a push-chain drive system. An operating platform is installed at the top end of the telescopic mast. The push-chain drive system is configured to control the telescoping of the telescopic mast. The push-chain drive system includes a chain box and a drive box provided on one side of the bottom of the chain box and connected to the chain box. The top end of the drive box is fixedly connected to the bottom of the telescopic mast. A push-chain output port is provided at the top of the drive box. The push-chain output from the drive box extends vertically upward along the axis of the telescopic mast and is fixedly connected to the bottom end of the top section of the telescopic mast. The telescoping of the entire telescopic mast and the lifting of the operating platform are realized under the telescoping of the push-chain.

[0007] Preferably, the chain box includes a chain box housing. A chain box guide plate is provided inside the chain box housing. A coiled chain guide is provided on the chain box guide plate. A horizontal section is provided at the bottom of the chain guide. A drive box guide plate is provided inside the drive box. The horizontal section extends into the drive box guide plate. The end of the horizontal section is connected to a vertical section through an arc transition. The vertical section opens at the top of the drive box and forms a chain output port. The horizontal section and the vertical section divide the drive box guide plate into a first guide plate and a second guide plate for forming a chain guide inside the drive box. A drive shaft passing through the drive box and rotatably connected to the drive box is provided inside the arc transition. A sprocket is provided on the drive shaft. The sprocket is in transmission connection with the push-chain. A variable-frequency motor is provided outside the drive box. The variable-frequency motor is in transmission connection with the drive shaft through a speed reducer. The variable-frequency motor is equipped with a brake. A travel limiter connected to the drive shaft is also installed at the other end of the drive box. A control panel for controlling the actions of the variable-frequency motor and the brake is provided on the operating platform.

[0008] Preferably, the telescopic mast includes a plurality of mast tubes nested with each other. A fixing plate is provided at the top end of the mast tube of the top section. The center of the bottom of the operating platform is fixedly connected to the fixing plate. A chain joint is provided at the output end of the push-chain. The push-chain is fixedly connected to the sealing plate at the bottom of the mast tube of the top section through the chain joint. Except for the mast tube of the top section, a joint sleeve is fixedly connected to the top end of the mast tubes of the other sections. Except for the mast tube of the bottom section, a limiting plate and a sliding pad block that are slidably matched with the inner wall of the adjacent mast tube are integrally connected to the outer wall of the other mast tubes. The limiting plate is used in cooperation with the joint sleeve. Except for the mast tube of the top section, a guide plate for guiding the push-chain is fixedly connected to the inner wall of the other mast tubes. And there is 1 guide plate which is fixedly connected to the bottom of the corresponding mast tube. A guide hole matching the cross-sectional shape of the push-chain is provided inside the guide plate.

[0009] Preferably, the push chain is configured to be formed by sequentially connecting a plurality of light-load chain links or a plurality of heavy-load chain links according to the load of the lifting platform. The light-load chain link is the same as the chain link of a push chain for a villa ladder, except that: the outer rollers on both sides of the pin shaft are cancelled, the length of the roller is shortened, and a first roller is respectively installed on the pin shaft where the two sides of the roller are located. Correspondingly, two sprockets cooperating with the first roller are installed on the drive shaft; the heavy-load chain link is based on the light-load chain link, and two additional second rollers are installed at both ends of the pin shaft. At the same time, two more sprockets cooperating with the second rollers are arranged on the drive shaft, and the load capacity of the push chain is increased by the cooperation of four sprockets and the heavy-load chain link.

[0010] Preferably, it further includes a bottom plate. The reducer, the chain box and the bottom of the drive box are respectively fixedly connected to the upper end of the bottom plate. The chain box and the variable-frequency motor are respectively fixedly connected to the mast pipe of the bottom section. A support plate is also connected between the mast pipe of the bottom section and the bottom plate.

[0011] Preferably, it further includes a programmable controller, a human-machine interaction device, and a ranging sensor. A ranging sensor for measuring the real-time height of the working platform is installed at the bottom of the working platform. The ranging sensor is used in cooperation with the upper end of the bottom plate. The controller is electrically connected to the power supply and is respectively electrically connected to the human-machine interaction device and the ranging sensor through wires.

[0012] The beneficial effects of a push-chain type lifting working platform of the present invention are as follows:

[0013] (1) The telescopic mast of the present invention is driven by a push chain, replacing traditional pneumatic, electric and other methods, endowing the telescopic mast with higher load-bearing capacity, supporting higher loads, and having stronger overall versatility. The push chain has a fast transmission speed and a stable speed that is easy to control. Therefore, compared with a scissor-type manned working platform using hydraulic drive, the present invention can save the time required for lifting and can quickly lift in case of emergency or bad conditions.

[0014] (2) The present invention performs fast and precise position control by setting a programmable controller, a human-machine interaction device, and a ranging sensor, and realizes self-locking at any height, with higher stopping accuracy, which can prevent the mast height from decreasing due to gravity over time and prevent the working platform from sliding. At the same time, further safety protection can be provided by setting limit switches, overrun protection for the telescopic amount of the telescopic mast can be provided by setting position sensors, and overrun protection for the lifting speed of the mast can be provided. The position sensor and the variable-frequency motor are closed-loop protected by the programmable controller to ensure the personal safety of the operator.

[0015] (3) The working platform of the present invention can be a manned working platform or a working platform for loading various mechanical equipment such as communication equipment, lighting equipment, and measuring equipment. A traveling mechanism can also be installed under the bottom plate. Therefore, the push-chain lifting mast of the present invention has a wide range of applications, is easy to install, and can achieve multiple functions in different scenarios.

[0016] (4) After being retracted, the push chain of the present invention is coiled and stored in the chain box. After being retracted, the mast is nested in multiple layers. The overall structure is compact, the floor area is small, and it is very convenient to move and carry, and can easily pass through narrow spaces.

[0017] (5) A guide rail plate is provided inside the telescopic mast of the present invention, which can limit the lateral movement of the chain when the push chain extends over a long stroke, prevent the chain from bending, and improve the stability of the push chain. The push chain is used to push the mast vertically and drive the working platform to lift. The direction of the force is consistent with the lifting direction, without the need for additional thrust, and the transmission efficiency is higher.

[0018] (6) By placing the push chain inside the telescopic mast, the present invention can avoid the influence of harsh environments such as moisture or sand and dust on the push chain; space can be reserved inside the mast to place cables, and various equipment installed on the top can route wires along the push chain inside the mast, with higher integration, and the cables can be prevented from aging due to the influence of the external environment. Description of the Drawings

[0019] Figure 1 、Schematic diagram of the overall structure of the present invention;

[0020] Figure 2 、Schematic diagram of the structure of the telescopic mast closed by the retraction of the push chain of the present invention;

[0021] Figure 3 、Schematic diagram of the internal structure of the telescopic mast closed by the retraction of the push chain of the present invention;

[0022] Figure 4 、Schematic diagram of the structure of the push chain lifting the telescopic mast of the present invention;

[0023] Figure 5 、Schematic diagram of the internal structure of the push chain lifting the telescopic mast of the present invention;

[0024] Figure 6 、Schematic diagram of the internal structure of the drive box cooperating with the chain box of the present invention;

[0025] Figure 7 、Schematic diagram of the internal structure of the telescopic mast of the present invention;

[0026] Figure 8 、Schematic diagram of the light-load chain structure of the present invention;

[0027] Figure 9, Schematic structural diagram of the heavy-duty chain of the present invention;

[0028] Figure 10 , Schematic diagram of the guide rail plate of the present invention;

[0029] Figure 11 , Schematic diagram of the guide rail plate of the drive box of the present invention;

[0030] Figure 12 , Schematic diagram of the manned operation platform of the present invention;

[0031] Markings in the figure: 1, Push-chain lifting mast; 2, Operation platform; 21, Door; 22, Guardrail; 23, Control panel; 3, Push-chain drive system; 4, Drive box; 41, Drive box housing; 42, Sprocket; 43, Drive box guide rail plate; 431, First guide rail plate; 432, Second guide rail plate; 5, Chain box; 51, Chain box housing; 52, Chain box guide rail plate; 521, Chain guide rail; 6, Push chain; 61, Chain joint; 62, Chain link; 621, Light-load chain link; 622, Heavy-load chain link; 623, First chain plate; 624, Second chain plate; 625, Pin shaft; 626, Roller; 627, First roller; 628, Second roller; 7, Telescopic mast; 71, Mast tube; 72, Guide rail plate; 721, Guide hole; 73, Sliding cushion block; 74, Limit plate; 75, Sleeve; 76, Fixed plate; 8, Variable-frequency motor; 9, Reducer; 10, Travel limiter; 11, Bracket; 111, Hoop; 112, Support plate; 12, Bottom plate. Detailed implementation manners

[0032] The following description is only for the preferred embodiments of the present invention and is not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0033] The following embodiments can be understood as separately expressing a part of the local structure or method of the present invention, or can also be understood as the embodiments combined with each other to explain the connotation of the larger-scale structure or method of the present invention.

[0034] Embodiment 1

[0035] A push-chain type lifting operation platform, as Figures 1-12As shown in the figure, it includes a push-chain lifting mast 1, and the push-chain lifting mast 1 includes a telescopic mast 7 and a push-chain drive system. An operation platform 2 is installed at the top of the telescopic mast 7. The push-chain drive system is configured to control the telescopic movement of the telescopic mast 7. The push-chain drive system includes a chain box 5 and a drive box 4 provided on one side of the bottom of the chain box 5 and connected to the chain box. The top of the drive box 4 is fixedly connected to the bottom of the telescopic mast 7. A push-chain output port is provided at the top of the drive box 4. The push-chain 6 output from the drive box extends vertically upward along the axis of the telescopic mast 7 and is fixedly connected to the bottom end of the top section of the telescopic mast. The telescopic movement of the entire telescopic mast 7 and the lifting of the operation platform 2 are realized under the telescopic movement of the push-chain.

[0036] In this embodiment, the operation platform can be a manned operation platform or an operation platform for carrying mechanical equipment, such as for installing communication equipment, lighting equipment, and measuring equipment, so that the present invention can achieve various functions. By driving the telescopic mast 7 with a push-chain, the operation platform can be accurately stopped at any required height, and it has the characteristics of fast driving speed, accurate positioning, stable lifting process, and high bearing capacity.

[0037] Embodiment 2

[0038] As shown in Figure 2 , 3 , 5, and 6, the chain box 5 includes a chain box housing 51. A chain box guide plate 52 is provided inside the chain box housing 51. A coiled chain guide 521 is provided on the chain box guide plate 52. Its coiled form can be configured in the form of alternating straight line segments and arc segments as shown in Figure 3 , or in other coiled ways, such as in a spiral circular arc coiled posture. The former has the characteristic of smaller floor area. A horizontal section is provided at the bottom of the chain guide 521. As shown in Figure 3 , a drive box guide plate 43 is provided inside the drive box 4. The horizontal section extends into the drive box guide plate. The end of the horizontal section is connected to a vertical section through an arc transition. The vertical section opens at the top of the drive box 4 and forms a chain output port. As shown in Figure 3 , 11 , the horizontal section and the vertical section divide the drive box guide plate 43 into a first guide plate 431 and a second guide plate 432 for forming a chain guide inside the drive box. A drive shaft passing through the drive box 4 and rotatably connected to the drive box is provided inside the arc transition. As shown in Figure 3 , 6 , a sprocket 42 is provided on the drive shaft. The sprocket 42 is in transmission connection with the push-chain 6. As shown in Figure 2 , 4As shown, a variable frequency motor 8 is arranged outside the driving box 4, and the variable frequency motor 8 is connected to the driving shaft through a reducer 9. The variable frequency motor 8 is equipped with a brake, and a travel limiter 10 connected to the driving shaft is also arranged at the other end of the driving box (a commercially available product can be selected, which is a safety protection device that can limit the lifting travel of the telescopic mast within a safe range to avoid safety accidents caused by excessive travel). Figure 12 As shown, the working platform 2 is provided with a control panel 23 for controlling the frequency conversion motor 8 and the action of the brake.

[0039] In this embodiment, the chain box guide plate is slotted to form a winding chain guide, and the chain guide 521 cooperates with the roller of the push chain, that is, the grooves that cooperate with the rollers are respectively provided on the opposite groove walls of the slots, and the rollers are connected in a rolling manner in the grooves, so that the push chain can move along the trajectory set by the chain guide, and the chain guide in the drive box is the same. Driven by a variable frequency motor, the chain can be output along the chain output port to the telescopic mast, thereby realizing the rise of the working platform, and can also be retracted into the chain box to realize the descent of the working platform. When the working platform is a manned working platform, the worker can manually control the height of the working platform through the control panel.

[0040] Example 3

[0041] like Figure 3 , 4 As shown in , 5 and 7, the telescopic mast 7 comprises a plurality of mast tubes 71 nested with each other, a fixing plate 76 is provided at the top of the mast tube 71 of the top segment, the center of the bottom of the working platform 2 is fixedly connected to the fixing plate, a chain joint 61 is provided at the output end of the push chain 6, and the push chain 6 is fixedly connected to the sealing plate at the bottom of the mast tube 71 of the top segment through the chain joint 61; except for the mast tube 71 of the top segment, the tops of the mast tubes 71 of the remaining segments are fixedly connected with a section sleeve 75 (the function of the section sleeve is to guide the adjacent mast tubes The outer walls of the remaining mast tubes 71, except for the mast tube 71 of the bottom segment, are integrally connected with a limit plate 74 and a sliding pad 73 (the sliding pad has a sliding guide function) that slide with the inner wall of the adjacent mast tube 71. The limit plate 74 is used in conjunction with the section sleeve 75, that is, on the one hand, the upper mast tube can pull the lower mast tube up, and on the other hand, it can prevent the adjacent mast tube from slipping off; except for the mast tube of the top segment, the inner walls of the remaining mast tubes 71 are welded or bolted with a guide plate 72 that provides guidance for the push chain 6, such as Figure 7 As shown, there is one guide rail plate, which is welded or bolted to the bottom of the corresponding mast tube 71, and a guide hole 721 matching the cross-sectional shape of the push chain 6 is opened on the inner side of the guide rail plate 72.

[0042] Example 4

[0043] As Figure 8 , 9 shown, the pushing chain 6 is set to be composed of a number of light-load chain links connected in sequence (light-load chain) or composed of a number of heavy-load chain links connected in sequence (heavy-load chain) according to the different loads of the lifting platform. As Figure 8 shown, the light-load chain link is the same as the chain link of a pushing chain for a villa ladder, except that: the outer rollers on both sides of the pin shaft are cancelled, the length of the roller 626 is shortened, and first rollers 627 are respectively installed on the pin shafts 625 where both sides of the roller 626 are located. Correspondingly, 2 sprockets cooperating with the first rollers 627 are installed on the drive shaft; As Figure 9 shown, the heavy-load chain link is based on the light-load chain link, and 2 second rollers 628 are additionally installed at both ends of the pin shaft 625. At the same time, 2 more sprockets cooperating with the second rollers 628 are arranged on the drive shaft, and the load capacity of the pushing chain is increased by the cooperation of 4 sprockets with the heavy-load chain link.

[0044] In this embodiment, a pushing chain for a villa ladder refers to the pushing chain for a villa ladder described in the patent document CN222331277U, and its structure and principle can be seen in detail in this patent document. The rollers in the chain are used for cooperating with the chain guide rail 521. Of course, other types of pushing chains that can achieve related functions can also be used.

[0045] Embodiment 5

[0046] As Figure 2 shown, it further includes a bottom plate 12. The speed reducers 9, the chain boxes 5 and the bottoms of the drive boxes 4 are respectively fixedly connected to the upper end of the bottom plate 12. The chain boxes 5 and the variable-frequency motors are respectively fixedly connected to the mast tubes 71 of the bottom section. A support plate 112 is also connected between the mast tubes 71 of the bottom section and the bottom plate.

[0047] In this embodiment, a traveling mechanism can be installed at the lower end of the bottom plate so that the present invention can perform mobile operations.

[0048] Embodiment 6

[0049] As Figures 1-12As shown, it further includes a programmable controller (a common device, not shown in the figure), a human-machine interaction device (a common device, not shown in the figure), and a ranging sensor (a common device, not shown in the figure). A ranging sensor for measuring the real-time height of the working platform is installed at the bottom of the working platform 2. The ranging sensor is used in cooperation with the upper end of the bottom plate 12, that is, to measure the height of the working platform from the upper end of the bottom plate in real time. The controller is electrically connected to the power supply and is respectively electrically connected to the human-machine interaction device and the ranging sensor through wires. After the telescopic mast 7 is lifted to the specified height, the variable-frequency motor is braked by the brake, so that the manned working platform 2 accurately stays at the specified height and maintains its position through the push chain 6 to prevent the telescopic mast from descending.

[0050] Embodiment 7

[0051] This embodiment provides a way that the working platform is a manned working platform. As Figure 12 shown, the working platform 2 includes a door 21 and a guardrail 22. The operator opens the door and enters the platform, and the guardrail 22 protects the operator from falling during high-altitude operations. A control panel 23 is installed on the guardrail 22, and the operator can independently control the lifting of the telescopic mast through the control panel 23 on the platform to adjust the height of the working platform.

Claims

1. A push-chain type lifting working platform, characterized in that: Comprising a push-chain lifting mast, the push-chain lifting mast includes a telescopic mast and a push-chain drive system. An operation platform is installed at the top end of the telescopic mast. The push-chain drive system is configured to control the telescoping of the telescopic mast. The push-chain drive system includes a chain box and a drive box provided on one side of the bottom of the chain box and connected to the chain box. The top end of the drive box is fixedly connected to the bottom of the telescopic mast. A push-chain outlet is provided at the top of the drive box. The push-chain output from the drive box extends vertically upward along the axis of the telescopic mast and is fixedly connected to the bottom end of the top section of the telescopic mast. The telescoping of the entire telescopic mast and the lifting of the operation platform are realized under the telescoping of the push-chain.

2. A push-chain type lifting operation platform according to claim 1, characterized in that: the chain box includes a chain box housing. A chain box guide plate is provided inside the chain box housing. A coiled chain guide is provided on the chain box guide plate. A horizontal section is provided at the bottom of the chain guide. A drive box guide plate is provided inside the drive box. The horizontal section extends into the drive box guide plate. The end of the horizontal section is connected to a vertical section through an arc transition. The vertical section opens at the top of the drive box and forms a chain outlet. The horizontal section and the vertical section divide the drive box guide plate into a first guide plate and a second guide plate for forming a chain guide inside the drive box. A drive shaft passing through the drive box and rotatably connected to the drive box is provided inside the arc transition. A sprocket is provided on the drive shaft. The sprocket is in transmission connection with the push-chain. A variable-frequency motor is provided outside the drive box. The variable-frequency motor is in transmission connection with the drive shaft through a speed reducer. The variable-frequency motor is equipped with a brake. A travel limiter connected to the drive shaft is also installed at the other end of the drive box. A control panel for controlling the actions of the variable-frequency motor and the brake is provided on the operation platform.

3. The push-chain type lifting work platform according to claim 2, characterized in that: The telescopic mast includes a plurality of mast tubes nested with each other. A fixing plate is provided at the top end of the mast tube of the top section. The center of the bottom of the operation platform is fixedly connected to the fixing plate. A chain joint is provided at the output end of the push-chain. The push-chain is fixedly connected to the sealing plate at the bottom of the mast tube of the top section through the chain joint. Except for the mast tube of the top section, a joint sleeve is fixedly connected to the top end of the mast tubes of the other sections. Except for the mast tube of the bottom section, a limiting plate and a sliding pad block that are slidably matched with the inner wall of the adjacent mast tube are integrally connected to the outer wall of the other mast tubes. The limiting plate is used in cooperation with the joint sleeve. Except for the mast tube of the top section, a guide plate for guiding the push-chain is fixedly connected to the inner wall of the other mast tubes. Moreover, there is 1 guide plate and it is fixedly connected to the bottom of the corresponding mast tube. A guide hole matching the cross-sectional shape of the push-chain is provided inside the guide plate.

4. The push-chain type lifting work platform according to claim 3, characterized in that: The described push chain is set to be composed of a number of light-load chain links connected in sequence or a number of heavy-load chain links connected in sequence according to the different loads of the lifting platform. The light-load chain link is the same as the chain link of a push chain for a villa ladder, except that: the outer rollers on both sides of the pin shaft are cancelled, the length of the roller is shortened, and a first roller is installed on the pin shaft where the two sides of the roller are located. Correspondingly, two sprockets that cooperate with the first roller are installed on the drive shaft; the heavy-load chain link is based on the light-load chain link, and two additional second rollers are installed at both ends of the pin shaft. At the same time, two more sprockets that cooperate with the second rollers are arranged on the drive shaft, and the load capacity of the push chain is increased by the cooperation of the four sprockets and the heavy-load chain link.

5. The push-chain type lifting working platform according to claim 4, characterized in that: It further includes a bottom plate. The reducer, the chain box and the bottom parts of the drive box are respectively fixedly connected to the upper end of the bottom plate. The chain box and the variable-frequency motor are respectively fixedly connected to the mast pipe of the bottom section. A support plate is also connected between the mast pipe of the bottom section and the bottom plate.

6. The push-chain type lifting working platform according to claim 5, characterized in that: It further includes a programmable controller, a human-machine interaction device, and a ranging sensor. A ranging sensor for measuring the real-time height of the work platform is installed at the bottom of the work platform. The ranging sensor is used in cooperation with the upper end of the bottom plate. The controller is electrically connected to the power supply and is respectively electrically connected to the human-machine interaction device and the ranging sensor through wires.

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