阅读说明：本技术 一种用于架空线缆作业设备上下线的吊装装置 (Hoisting device for overhead cable operation equipment to get on and off line ) 是由 赖华敏 李夏 饶成康 于 2020-11-06 设计创作，主要内容包括：本发明公开了一种用于架空线缆作业设备上下线的吊装装置,属于电力辅助设备技术领域,包括吊筐及平台,平台设于吊筐上且用于放置架空线缆作业设备,吊装装置还包括立杆、卷扬机构、调整电机及控制机构,立杆的顶部设有挂钩,卷扬机构设于挂钩与吊筐之间且可驱动吊筐上升或下降,调整电机设于吊筐上且可驱动平台前后移动,控制机构设于吊筐上且用于控制卷扬机构和调整电机。本发明提供的吊装装置能很好的满足架空线缆作业设备上下线的工作要求,检修人员无需攀爬至高处后将吊装构件安装于架空线缆上,有利于提高架空线缆检修作业的安全性和效率。(The invention discloses a hoisting device for the up-line and down-line of overhead cable operation equipment, which belongs to the technical field of electric auxiliary equipment and comprises a hanging basket and a platform, wherein the platform is arranged on the hanging basket and used for placing the overhead cable operation equipment, the hoisting device also comprises an upright rod, a hoisting mechanism, an adjusting motor and a control mechanism, the top of the upright rod is provided with a hook, the hoisting mechanism is arranged between the hook and the hanging basket and can drive the hanging basket to ascend or descend, the adjusting motor is arranged on the hanging basket and can drive the platform to move back and forth, and the control mechanism is arranged on the hanging basket and is used for controlling the hoisting mechanism and the adjusting motor. The hoisting device provided by the invention can well meet the working requirements of the overhead cable operation equipment for loading and unloading, and the maintainers do not need to climb to a high place and then install the hoisting component on the overhead cable, so that the safety and efficiency of the overhead cable maintenance operation are improved.)

1. The utility model provides a hoist device for overhead cable operation equipment is on-line and off-line, includes and hangs basket and platform, and the platform is located and is hung on the basket and be used for placing overhead cable operation equipment, its characterized in that, hoist device still includes pole setting, hoist mechanism, adjustment motor and control mechanism, and the top of pole setting is equipped with the couple, and hoist mechanism locates between couple and the basket of hanging and can drive and hang the basket and rise or descend, and adjustment motor locates and hangs on the basket and can drive the platform back-and-forth movement, and control mechanism locates and hangs on the basket and be used for controlling hoist mechanism and adjustment motor.

2. The hoisting device of claim 1, wherein the hoisting mechanism comprises a hoisting wheel, a traction belt wound on the hoisting wheel, and a hoisting motor for driving the hoisting wheel, and the tail end of the traction belt is connected to the hook.

3. The hoisting device according to claim 2, wherein the hook is provided with two hooks respectively located at the left and right sides of the basket, the hook is connected with a cross rod arranged along the front and rear direction, the hoisting mechanisms are provided with two hooks respectively corresponding to the two hooks, each hoisting mechanism is provided with two hoisting wheels respectively located at the front and rear sides of the corresponding vertical rod, and the ends of the traction belts on the two hoisting wheels are respectively connected to the front and rear ends of the cross rod.

4. The hoisting device according to claim 3, wherein the hoisting mechanism further comprises a transmission shaft, the transmission shaft is rotatably erected on the basket, the two hoisting wheels are respectively sleeved at two ends of the transmission shaft, a transmission structure is arranged between the hoisting motor and the transmission shaft, and the hoisting motor drives the hoisting wheels to rotate through the transmission structure and the transmission shaft.

5. The hoisting device as claimed in claim 3, wherein the hoisting mechanism further comprises a safety switch arranged on the basket and a pressure lever for triggering the safety switch, and when the basket rises until the pressure lever abuts against the cross bar, the pressure lever triggers the safety switch and stops the operation of the hoisting motor.

6. The hoisting device as recited in claim 2, wherein the basket is provided with a limiting structure for limiting the traction belt, the limiting structure comprises a limiting seat and a pair of limiting wheels, the limiting seat is disposed on the basket, the limiting wheels are rotatably disposed on the limiting seat, and the traction belt passes through the limiting seat and is disposed between the two limiting wheels disposed in pairs.

7. The hoisting device of claim 1, wherein the adjustment motor is provided with a push rod capable of moving back and forth, and the platform is connected to the push rod.

8. The hoisting device according to claim 1, wherein the basket is provided with a support beam arranged in the front-rear direction, and the bottom of the platform is provided with a sliding seat sleeved outside the support beam; and/or an elastic pad is arranged on the platform.

9. The hoisting device according to any one of claims 1 to 8, wherein an electric cabinet is provided at the bottom of the basket, the control mechanism is provided in the electric cabinet, a battery is further provided in the electric cabinet, the control mechanism comprises a control board and a wireless signal transceiver, and the wireless signal transceiver, the hoisting mechanism and the adjustment motor are all in signal connection with the control board.

10. The hoisting device of claim 9, further comprising a camera disposed on the basket, the camera being in signal communication with the control panel.

Technical Field

The invention relates to the technical field of electric auxiliary equipment, in particular to a hoisting device for the on-line and off-line of overhead cable operation equipment.

Background

With the development of the electric power operation robot technology, more and more robots replace maintainers to engage in work with severe environment and complex procedures, and the robots are more and more widely applied to the aspect of overhead cables. In order to eliminate potential safety hazards of the overhead cable, the inspection robot can be used for inspecting the overhead cable, and the maintainers can know the specific conditions of the overhead cable according to the pictures fed back by the inspection robot so as to make and implement the maintenance measures for eliminating the potential safety hazards in time. In order to clean hanging objects on the overhead cable or clean an aged external coating of the overhead cable, a cleaning robot can be adopted to clean the overhead cable so as to perform spraying operation on the overhead cable in the following process. In order to improve the transmission safety of the overhead cable, the spraying robot can be used for spraying the insulating paint on the overhead cable after cleaning is finished, so that the insulating paint forms a new insulating layer outside the overhead cable.

Because the overhead cable has a certain hoisting bearing capacity, the overhead cable operation equipment is usually directly suspended on the corresponding overhead cable for operation. In order to suspend the overhead cable operation equipment on the overhead cable to complete the on-line action, or in order to take the overhead cable operation equipment off the overhead cable to complete the off-line action, the maintainer needs to climb to a high position to install the hanging wheel on the overhead cable, and then lift the operation equipment to the height of the overhead cable or lower the operation equipment on the ground through the winch and the hanging rope. The current mode of inserting winding or unwinding coils of built on stilts cable operation equipment needs the maintainer to climb to the eminence and install, is unfavorable for improving operation security and operating efficiency.

Disclosure of Invention

In order to overcome the defects and shortcomings in the prior art, the invention provides the hoisting device for the overhead cable operation equipment to go up and down, which effectively improves the operation safety of the overhead cable operation equipment when going up and down.

In order to achieve the technical purpose, the invention provides a hoisting device for loading and unloading overhead cable operation equipment, which comprises a hanging basket and a platform, wherein the platform is arranged on the hanging basket and used for placing the overhead cable operation equipment, the hoisting device also comprises an upright rod, a hoisting mechanism, an adjusting motor and a control mechanism, the top of the upright rod is provided with a hook, the hoisting mechanism is arranged between the hook and the hanging basket and can drive the hanging basket to ascend or descend, the adjusting motor is arranged on the hanging basket and can drive the platform to move back and forth, and the control mechanism is arranged on the hanging basket and is used for controlling the hoisting mechanism and the adjusting motor.

Preferably, the hoisting mechanism comprises a hoisting wheel, a traction belt wound on the hoisting wheel and a hoisting motor for driving the hoisting wheel, and the tail end of the traction belt is connected to the hook.

Preferably, the couple is equipped with two and is located the left and right sides of hanging the basket respectively, and the couple is connected with the horizontal pole of arranging along the fore-and-aft direction, and hoisting mechanism is equipped with two and corresponds the setting with two couples respectively, and every hoisting mechanism all is equipped with two hoist wheels and two hoist wheels are located the front and back both sides that correspond the pole setting respectively, and the end of traction belt is connected in both ends around the horizontal pole respectively on two hoist wheels.

Preferably, the hoisting mechanism further comprises a transmission shaft, the transmission shaft is rotatably erected on the hanging basket, the two hoisting wheels are respectively sleeved at two ends of the transmission shaft, a transmission structure is arranged between the hoisting motor and the transmission shaft, and the hoisting motor drives the hoisting wheels to rotate through the transmission structure and the transmission shaft.

Preferably, the hoisting mechanism further comprises a safety switch arranged on the hanging basket and a pressure lever used for triggering the safety switch, and when the hanging basket rises until the pressure lever is abutted against the cross rod, the pressure lever triggers the safety switch and stops the hoisting motor.

Preferably, be equipped with on the hanging basket and make the traction area receive spacing limit structure, limit structure includes spacing seat and a pair of spacing wheel, and on the hanging basket was located to spacing seat, spacing wheel rotatable locate on spacing seat, the traction area was worn through spacing seat and is located between two spacing wheels that set up in pairs.

Preferably, the adjusting motor is provided with a push rod capable of moving back and forth, and the platform is connected with the push rod.

Preferably, the hanging basket is provided with support beams arranged along the front-back direction, and the bottom of the platform is provided with a sliding seat sleeved outside the support beams; and/or an elastic pad is arranged on the platform.

Preferably, the bottom of hanging the basket is equipped with the electric cabinet, and control mechanism still is equipped with the battery in locating the electric cabinet in the electric cabinet, and control mechanism includes control panel and wireless signal transceiver, hoisting mechanism and the equal signal connection of adjustment motor are in the control panel.

Preferably, the hoisting device further comprises a shooting device arranged on the hanging basket, and the shooting device is in signal connection with the control panel.

After the technical scheme is adopted, the invention has the following advantages:

1. according to the hoisting device provided by the invention, when overhead cable operation equipment is on line, the hook is firstly hung on the overhead cable through the vertical rod, then the hoisting mechanism drives the hanging basket and the operation equipment to ascend, and after the hanging basket ascends to a proper height, the motor is adjusted to drive the operation equipment to move back and forth through the platform, so that the travelling mechanism of the operation equipment can be smoothly hung on the overhead cable, and the on-line action of the operation equipment is completed. When the overhead cable operation equipment is off-line, the travelling mechanism of the operation equipment is separated from the overhead cable, then the hoisting mechanism drives the hanging basket and the operation equipment to descend, and finally the hook is taken from the cable through the vertical rod. The hoisting device provided by the invention can well meet the working requirements of the overhead cable operation equipment for loading and unloading, and the maintainers do not need to climb to a high place and then install the hoisting component on the overhead cable, so that the safety and efficiency of the overhead cable maintenance operation are improved.

2. The quantity and the setting position that rationally set up the couple rationally set up hoisting mechanism's concrete structure, and the end of two traction bands of every hoisting mechanism is connected in both ends around the horizontal pole respectively, and four bights of hanging the basket all connect in the horizontal pole through traction band, make the even atress of basket ability when going up and down, are favorable to improving the stability when hanging the basket and driving the operation equipment and go up and down.

3. When hanging the basket and rising to depression bar and horizontal pole conflict, hanging the basket and rising to target in place, at this moment, the depression bar triggers safety switch under the conflict effect of horizontal pole, and hoist motor outage stop motion hangs the basket and no longer rises, and the biggest stroke when hanging the basket through depression bar and trigger switch's cooperation effective control hoisting mechanism drive is favorable to improving the holistic operation security of device.

4. The traction belt penetrates through the limiting seat and is located between the two limiting wheels which are arranged in pairs, the traction belt is limited through the limiting wheels and the limiting seat, the retraction stability of the traction belt is improved, and the lifting stability of the hoisting device is improved.

5. The adjusting motor preferably adopts a push rod motor, the platform is connected to a push rod of the adjusting motor, the push rod drives the platform to move back and forth when the adjusting motor works, and the platform can drive the operation equipment placed on the platform to move back and forth synchronously so that the operation equipment is close to or far away from the overhead cable, so that the travelling mechanism of the operation equipment can be smoothly hung or separated from the overhead cable.

6. The sliding seat at the bottom of the platform is sleeved on the supporting beam of the hanging basket, and the stability of the platform in the front-back movement process is improved through the matching of the sliding seat and the supporting beam. Set up the cushion on the platform, through the stability of cushion increase operation equipment when placing on the platform, avoid operation equipment to hang the gliding condition of basket lift relative to the platform, be favorable to improving the stability when operation equipment goes up the line or rolls off the production line.

7. The battery is used for supplying power to electrical appliances such as a hoisting motor, an adjusting motor, a safety switch and the like, the defect that the application range of the hoisting device is limited due to the power connection problem is overcome, and the situation that the device cannot run smoothly due to the fact that a power connection wire is wound on other parts can be avoided. Ground maintainer can carry out wireless signal exchange through remote control unit and control mechanism to according to particular case through remote control unit to control panel transmission operating instruction, can instruct relevant component to carry out the instruction after the control panel receives operating instruction, make hoist device can hang the operation equipment smoothly and put to the overhead cable on.

8. The shooting device shoots the on-line action and the off-line action of the operation equipment, and the shot picture can be fed back to the remote control device used by the ground maintainer through the control mechanism, so that the ground maintainer can timely make an operation instruction according to the fed-back picture to enable the operation equipment to be smoothly hung or separated from the overhead cable.

Drawings

Fig. 1 is an overall schematic view of a hoisting device according to an embodiment of the present invention;

fig. 2 is an exploded view of a lifting device according to an embodiment of the present invention;

fig. 3 is a schematic partial structure diagram of a hoisting device according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an adjusting motor and a platform in a hoisting device according to an embodiment of the present invention;

fig. 5 is an electrical control schematic diagram of a hoisting device according to an embodiment of the invention.

In the figure, 100-camera, 200-basket, 210-beam, 310-platform, 320-push plate, 330-push piece, 340-slide seat, 341-upper seat body, 342-lower seat body, 350-elastic cushion, 410-upright rod, 420-hook, 430-cross rod, 500-hoisting mechanism, 510-hoisting wheel, 520-traction belt, 530-hoisting motor, 540-transmission shaft, 550-compression rod, 560-safety switch, 600-adjusting motor, 610-push rod, 710-support, 720-limit seat, 730-support, 740-electric cabinet, 750-limit wheel, 810-control panel, 820-wireless signal transceiver and 830-remote control device.

Detailed Description

The invention is further described with reference to the following figures and specific examples. It is to be understood that the following terms "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," "bottom," and the like are used merely to indicate an orientation or positional relationship relative to one another as illustrated in the drawings, merely to facilitate describing and simplifying the invention, and are not intended to indicate or imply that the device/component so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore are not to be considered limiting of the invention.

Example one

As shown in fig. 1 to 5, a hoisting device for overhead cable work equipment to get on and off the line according to a first embodiment of the present invention includes a basket 200 and a platform 310, where the platform 310 is disposed on the basket 200 and is used for placing the overhead cable work equipment. The hoisting device further comprises an upright rod 410, a hoisting mechanism 500, an adjusting motor 600 and a control mechanism, wherein the top of the upright rod 410 is provided with a hook 420, the hoisting mechanism 500 is arranged between the hook 420 and the basket 200 and can drive the basket 200 to ascend or descend, the adjusting motor 600 is arranged on the basket 200 and can drive the platform 310 to move back and forth, and the control mechanism is arranged on the basket 200 and is used for controlling the hoisting mechanism 500 and the adjusting motor 600.

Referring to fig. 3, in the present embodiment, the vertical rod 410 is provided with two hooks respectively located at the left and right sides of the basket 200, and correspondingly, the hook 420 is also provided with two hooks respectively located at the left and right sides of the basket 200, and each hook 420 is connected to a cross rod 430 arranged along the front-rear direction. Correspondingly, the hoisting mechanism 500 is also provided with two hooks 420 which are respectively positioned at the left side and the right side of the basket 200, the hoisting mechanism 500 comprises hoisting wheels 510, traction belts 520 wound on the hoisting wheels 510 and a hoisting motor 530 for driving the hoisting wheels 510, each hoisting mechanism 500 is provided with two hoisting wheels 510, the two hoisting wheels 510 are respectively positioned at the front side and the rear side of the corresponding upright rod 410, and the tail ends of the traction belts 520 on the two hoisting wheels 510 are respectively connected to the front end and the rear end of the cross rod 430. Thus, the basket 200 is provided with four winding wheels 510, and the four winding wheels 510 are respectively located at four corners of the basket 200. In this embodiment, the hook 420 is fixed on the top end of the upright 410, the cross bar 430 is disposed through the hook 420, and the hook 420 and the cross bar 430 are fixed by screws.

The hoisting mechanism 500 further comprises a transmission shaft 540 arranged along the front-back direction, the transmission shaft 540 is rotatably erected on the hanging basket 200, the two hoisting wheels 510 are respectively sleeved at two ends of the transmission shaft 540, a transmission structure is arranged between the hoisting motor 530 and the transmission shaft 540, and the hoisting motor 530 drives the hoisting wheels 510 to rotate through the transmission mechanism and the transmission shaft 540. In this embodiment, the basket 200 is provided with a support 710, the transmission shaft 540 is rotatably disposed through the support 710 via a bearing, a motor shaft of the winding motor 530 is perpendicular to the transmission shaft 540, and a worm and gear transmission matching structure is preferably adopted between the motor shaft and the transmission shaft 540.

In order to improve the retraction stability of the traction belt 520, the basket 200 is provided with a limiting structure for limiting the traction belt 520, the limiting structure comprises a limiting seat 720 and a pair of limiting wheels 750, the limiting seat 720 is arranged on the basket 200, the limiting wheels 750 are rotatably arranged on the limiting seat 720, and the traction belt 520 penetrates through the limiting seat 720 and is positioned between the two limiting wheels 750 arranged in pairs. In this embodiment, the limiting structures are disposed corresponding to the traction belts 520 one by one, the limiting seats 720 are fixed on one side of the support 710, the limiting seats 720 are in a basket-shaped structure, and the two limiting wheels 750 disposed in pairs are respectively disposed on the left and right sides of the traction belts 520.

In order to limit the maximum stroke of the basket 200 during the ascending process, the winding mechanism 500 further includes a safety switch 560 disposed on the basket 200 and a pressing rod 550 for triggering the safety switch 560, and when the basket 200 ascends until the pressing rod 550 abuts against the cross rod 430, the pressing rod 550 triggers the safety switch 560 and stops the operation of the winding motor 530. In this embodiment, a bracket 730 is fixed to a side portion of one of the supports 710 corresponding to each winding mechanism 500, the safety switch 560 is disposed in the bracket 730, one end of the pressing rod 550 is hinged to a top end of the bracket 730, and a spring is disposed between a bottom of the pressing rod 550 and the top end of the bracket 730. When the basket 200 is lifted to the right position, the pressure lever 550 is abutted against the cross bar 430, the pressure lever 550 overcomes the elastic force of the spring to rotate under the abutting action of the cross bar 430 and triggers the safety switch 560, the winding motor 530 is powered off and stops running, and the basket 200 does not lift any more. When the plunger 550 is disengaged from the crossbar 430, the spring returns the plunger 550 to allow the plunger 550 to release the safety switch 560.

Referring to fig. 4, the adjustment motor 600 is preferably a push rod motor, the adjustment motor 600 includes a push rod 610 capable of moving forward and backward, and the platform 310 is connected to the push rod 610. When the adjustment motor 600 works, the push rod 610 drives the platform 310 to move back and forth, and the platform 310 can drive the operation equipment placed on the platform to synchronously move back and forth to enable the operation equipment to be close to or far away from the overhead cable. In this embodiment, the rear end of the adjusting motor 600 is hinged to the basket 200, the bottom of the platform 310 is fixed with the push plate 320, the bottom of the push plate 320 is fixed with the U-shaped push piece 330, and the push rod 610 and the push piece 330 are connected together by a pin.

In order to improve the stability of the platform 310 during the forward and backward movement, the basket 200 is provided with the support beams 210 arranged along the forward and backward directions, the bottom of the platform 310 is provided with the sliding base 340, the sliding base 340 is sleeved on the support beams 210 of the basket 200, and the stability of the platform 310 during the forward and backward movement is improved through the matching of the sliding base 340 and the support beams 210. In this embodiment, the sliding base 340 includes an upper base 341 and a lower base 342, and the upper base 341 and the lower base 342 jointly embrace the supporting beam 210 and are connected to the platform 310 through bolts.

In order to improve the stability of the work equipment when the work equipment is placed on the platform 310, the top surface of the platform 310 is provided with an elastic pad 350, and the stability of the work equipment when the work equipment is placed on the platform 310 is increased through the elastic pad 350, so that the work equipment is prevented from sliding relative to the platform 310 when the basket 200 is lifted. In this embodiment, the elastic pad 350 is preferably made of elastic foam.

The bottom of the basket 200 is provided with an electric cabinet 740, a control mechanism is arranged in the electric cabinet 740, the control mechanism comprises a control panel 810 and a wireless signal transceiver 820, and the wireless signal transceiver 820, the winding mechanism 500, the adjusting motor 600 and the safety switch 560 are all in signal connection with the control panel 810.

In order to facilitate the maintainer to know whether the operation equipment is successfully on line or successfully off line, the lifting device further comprises a camera 100 arranged on the basket 200, and the camera 100 is in signal connection with the control panel 810. The hoisting device of this embodiment is also equipped with remote control unit 830, remote control unit 830 is equipped with the main control board and wireless signal transceiver 820 and the display screen of signal connection in the main control board, can carry out wireless signal exchange through wireless signal transceiver 830 between remote control unit 830 and the control panel 810 to the maintainer sends operating instruction to control panel 810 through remote control unit according to particular case, can instruct relevant component execution instruction after control panel 810 receives operating instruction, makes hoisting device can hang the operation equipment smoothly and put to the overhead cable. The shooting device 100 can shoot the on-line action and the off-line action of the operation equipment, and can feed back the shot pictures to the remote control device 830 used by the ground maintainer through the control mechanism, so that the ground maintainer can timely make an operation instruction according to the fed back pictures to enable the operation equipment to be smoothly hung or separated from the overhead cable.

When the hoisting device of this embodiment is used to complete the on-line operation of the overhead cable operation equipment, the vertical rod 410 is firstly hung on the overhead cable through the hook 420, the traction belt 520 is separated from the hoisting wheel 510, then the hoisting motor 530 drives the hoisting wheel 510 to rotate so that the traction belt 520 is wound on the hoisting wheel 510, and the traction belt 520 drives the basket 200 and the operation equipment to ascend. After the basket 200 is lifted to a proper height, the hoisting motor 530 stops working, and then the platform 310 and the operation equipment placed on the platform 310 are driven to move back and forth by adjusting the motor 600, so that the travelling mechanism of the operation equipment can be smoothly hung on the overhead cable, and the operation equipment can be on-line.

When the overhead cable operation equipment is off line, the hoisting mechanism 500 drives the basket 200 to firstly ascend for a certain distance to enable the travelling mechanism of the operation equipment to be separated from the overhead cable in the vertical direction, then the adjustment motor 600 drives the platform 310 to move to enable the operation equipment to be far away from the overhead cable in the front-back direction, finally the basket 200 and the operation equipment are driven to descend through the hoisting mechanism 500, and after the basket 200 descends to the ground, the upright rod 410 is taken away from the overhead cable.

It can be understood that other transmission matching structures can be adopted between the motor shaft of the hoisting motor 530 and the transmission shaft 540, so as to meet the transmission requirement.

It is understood that the motor shaft of the winding motor 530 may be arranged in parallel with the driving shaft 540.

It is understood that the elastic pad 350 may be made of other materials to meet the requirement of anti-slip.

It will be appreciated that, instead of the elastic pad 350, an anti-slip structure such as a skid-proof pattern may be provided on the top surface of the platform 310, in which case the elastic pad 350 is not provided.

It will be appreciated that the slide 340 and the support beam 210 may be replaced by cooperating rails and rail mounts, the rail mounts being provided on the basket 200 and the rails being provided on the bottom of the platform 310.

It can be understood that the hoisting device of this embodiment can be used for realizing the action of going up and down the line of overhead cable inspection robot, overhead cable cleaning robot, overhead cable spraying robot or other overhead cable operation equipment.

Example two

In this embodiment, the hook 420 is detachably disposed on the top end of the upright 410. Before the overhead cable operation equipment is on line, the hook 420 is hung on the overhead cable through the vertical rod 410, the vertical rod 410 is separated from the hook 420, and the vertical rod is taken out of the hoisting device. After the overhead cable operation equipment is offline, the top end of the vertical rod 410 is connected with the hook 420, and then the hook 420 is taken down from the overhead cable through the vertical rod 410.

It can be understood that the hook 420 and the upright 410 can be detachably connected by a reasonable detachable connection structure such as a screw-thread fit, a screw-thread fit and a screwing groove fit.

Other embodiments of the present invention than the preferred embodiments described above, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit of the present invention, should fall within the scope of the present invention defined in the claims.