CN111957015B

CN111957015B - Automatic go up 5G basic station vertical ladder down

Info

Publication number: CN111957015B
Application number: CN202010808611.4A
Authority: CN
Inventors: 黄观金; 范红星; 范嘉乐; 印宇杰; 赵志强
Original assignee: Individual
Current assignee: Jing Zhou
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2021-11-26
Anticipated expiration: 2040-08-12
Also published as: CN113582092A; CN113521688A; CN111957015A

Abstract

The invention discloses a vertical ladder for an automatic up-down 5G base station, which comprises: the novel backpack comprises a backpack shell, a tool box, a metal rod A, a metal rod B, a metal rod C, a metal rod bracket, a pull rod, a metal rod E, a claw groove, a clamping groove, a tool clamping groove, a rotating wheel groove, a rope groove, a claw shell, a bevel gear A, a wheel groove, a clamping rod, a synchronous belt, a pulley, a spur gear A, a bevel gear B, a bevel gear C, wheels, a metal rod F, a metal rod H, a bearing A, a bearing B, a spur gear B, a metal rod G, a clamping block, a back belt, a safety belt and a slow descending wheel, wherein the whole structure is driven by a motor, so that the cost is reduced, the working efficiency is improved, and the safety of workers is guaranteed; the claw part is designed skillfully, and the rotation and up-and-down states of the claw are manually controlled, so that great convenience is provided for workers; the safety belt, the safety rope, etc. are provided in the practicality so as to ensure the life safety of workers, and meanwhile, for the convenience of work, the tool kit is arranged to replace the previous tool kit, so that the burden of the workers is reduced.

Description

Automatic go up 5G basic station vertical ladder down

Technical Field

The invention relates to the technical field of base station equipment, in particular to a vertical ladder for automatically going up and down 5G base stations.

Background

The existing base station is built with a vertical ladder for going up and down the base station, so that a worker can conveniently go up and down for maintenance, but the base station is very high, the worker is too hard to go up and down, and a packing maintenance tool is carried on the back, so that time and labor are wasted. It is also unsafe without any protection devices. Therefore, a machine which can automatically go up and down the vertical ladder and is provided with a protection device is needed, the safety is greatly improved, and the working efficiency of worker maintenance and daily maintenance is also improved.

Disclosure of Invention

Aiming at the problems, the invention provides an automatic vertical ladder for a 5G base station.

The technical scheme adopted by the invention is as follows: an automatic vertical ladder of 5G basic station about, includes: knapsack, tongs, bevel gear group, motor gear group, braces life saving panel, the knapsack include: the backpack comprises a backpack shell, a tool box, a metal rod A, a metal rod B, a metal rod C, a metal rod bracket, a pull rod, a metal rod E, a claw groove, a clamping groove, a tool clamping groove, a rotating wheel groove and a rope groove.

The tongs include: the claw comprises a claw shell, a bevel gear A, a wheel groove, a clamping rod, a synchronous belt, a pulley, a spur gear A, a bevel gear B, a bevel gear C, a wheel, a metal rod F, a metal rod H, a bearing A, a bearing B, a spur gear B and a metal rod G.

The bevel gear group comprises: bevel gear D, bevel gear E, bevel gear F, bevel gear G, bevel gear I and metal rod D.

The motor gear set includes: spur gear C, spur gear D, spur gear E.

The strap life saving board includes: fixture block, braces, safety belt, slowly fall wheel, backplate.

A tool box is fixedly arranged on the inner side of the backpack shell, and a tool clamping groove is fixedly arranged on the inner wall of the tool box; the upper end of the metal rod A is fixedly connected with the upper plate of the backpack shell, and the lower end of the metal rod A is propped against the lower plate of the backpack shell; one end of the hollow cylinder is fixedly arranged at the inner side of the backpack shell, a spring is arranged in the hollow cylinder, the other end of the hollow cylinder is rotatably connected with the rear end of the metal rod B, and the front end of the metal rod B is fixedly connected with the middle shelf corner of the pull rod; the end part of the metal rod C is fixedly connected with the side surface of the metal rod B; the rear end of the metal rod bracket is fixedly arranged at the inner side of the backpack shell; the outer end of the pull rod extends out of a side groove hole of the backpack shell; four metal rods E are arranged, two of the metal rods E are fixedly arranged below the upper plate of the backpack shell, and the other two metal rods E are fixedly arranged above the bottom plate of the backpack shell; the claw grooves are arranged on the side surface of the backpack shell; the clamping groove is arranged on the upper end face of the backpack shell; the rotating wheel groove is arranged on the front end surface of the backpack shell; the rope groove is arranged on the front end face of the backpack shell.

Preferably, the claw shell is rotatably arranged at the inner end of the metal rod E; the bevel gear F is fixedly arranged on the claw shell and is positioned on the side surface of the claw shell; the bevel gear A is fixedly arranged at one end of the metal rod G and is connected with the bevel gear F through a bearing A; the wheel groove is arranged on the inner side of the clamping groove of the claw shell; the clamping rod is slidably arranged in one end of the clamping jaw of the jaw shell, and the rear end of the clamping rod is provided with a spring; the spur gear B is fixedly arranged on the metal rod G, and the rear end of the metal rod G is connected with the claw shell through a bearing B; the synchronous belt wraps the spur gear B and the spur gear A; the pulley is rotatably arranged at the corner in the claw shell and is connected with the synchronous belt in a sliding way; the spur gear A is rotatably arranged on the inner side of a corner in the claw shell; the bevel gear B is rotatably arranged in the claw shell and is meshed with the spur gear B at the lower position; the metal rod F is fixedly arranged in a circular hole on the claw shell, the bevel gear C is meshed with the bevel gear B, the bevel gear C is fixedly connected with the lower end of the metal rod F, the upper end of the metal rod F is fixedly connected with a wheel on one side, and the wheel is rotatably arranged in a wheel groove; the metal rod H is fixedly connected with the wheels on the other side, and is rotatably arranged in a slotted hole at the claw clamping end of the claw shell.

Preferably, the bevel gear D is fixedly arranged on the rod body of the metal rod B, and the bevel gear D and the bevel gear F are meshed with each other; the bevel gear E is meshed with the bevel gear D, the bevel gear E is fixedly connected with the metal rod D, and a rod body of the metal rod D is fixedly connected with a bearing in a circular hole in the front end of the metal rod bracket; bevel gear G is located bevel gear E below, and bevel gear G fixed mounting is at metal pole D lower extreme, and bevel gear G and bevel gear I intermeshing rotate and install on metal pole B, and bevel gear I and bevel gear A intermeshing.

Preferably, the spur gear C is connected with a motor shaft of a motor, the motor is fixedly installed in the backpack shell, the spur gear C is meshed with the spur gear D on one side, the spur gear D is fixedly installed in the middle of the metal rod D on the right side, the spur gear D is meshed with the spur gear E, and the spur gear E is fixedly installed in the middle of the metal rod D on the left side.

Preferably, the back plate is slidably mounted on the front end face of the backpack shell, a clamping block is arranged on the back plate, the clamping block is movably buckled with the clamping groove, a strap is arranged on the front end face of the back plate, and a safety belt is mounted at a position, close to the lower position, of the front end face of the back plate; the slow descending wheel is rotatably arranged in the rotating wheel groove, and a slow descending rope in the slow descending wheel is fixedly connected with the buckle on the rear end face of the back plate.

Has the advantages that:

1. the whole structure of the invention is driven by a motor, thus reducing the cost, improving the working efficiency and guaranteeing the safety of workers.

2. The claw part is designed skillfully, and the rotation and the up-and-down states of the claw are manually controlled. Providing great convenience for workers.

3. The utility model provides devices such as safety belt, safety rope so that guarantee workman's life safety, simultaneously for convenient operation, be equipped with the toolbox and replace saddlebag before, alleviate workman's burden.

Drawings

Fig. 1 and 2 are schematic overall structural diagrams of the present invention.

Fig. 3 is a schematic view of the internal structure of the present invention.

Fig. 4 and 5 are schematic views of the backpack structure of the present invention.

Fig. 6 is a schematic view of the gripper structure of the present invention.

Fig. 7 and 8 are schematic diagrams of the internal structure of the gripper of the present invention.

Fig. 9 is a partially enlarged structural view of the bevel gear set of the present invention.

Fig. 10 is a partially enlarged structural view of the motor gear set of the present invention.

Fig. 11 and 12 are schematic diagrams of the structure of the harness life-saving board of the invention.

Reference numerals:

1-a backpack; 2, gripping the hand; 3-bevel gear set; 4-a motor gear set; 5-a harness life saving board; 101-a backpack shell; 102-a tool kit; 103-metal rod a; 104-metal rod B; 105-metal rod C; 106-metal rod holder; 107-pull rod; 108-metal rod E; 109-claw grooves; 110-card slot; 111-tool card slot; 112-rotating wheel groove; 113-rope groove; 114-a hollow cylinder; 201-claw shell; 202-bevel gear a; 203-rumbling groove; 204-clamping rod; 205-a synchronous belt; 206-a pulley; 207-spur gear A; 208-bevel gear B; 209-bevel gear C; 210-rumbling; 211-metal rod F; 212-metal rod H; 213-bearing a; 214-bearing B; 215-spur gear B; 216-metal rod G; 301-bevel gear D; 302-bevel gear E; 303-bevel gear F; 304-bevel gear G; 306-bevel gear I; 307-metal rod D; 401-spur gear C; 402-spur gear D; 403-spur gear E; 501-a fixture block; 502-harness; 503-a safety belt; 504-slow descending wheel; 505-a back plate.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In one embodiment, as shown in fig. 1 to 12, an automatic vertical ladder for a 5G base station includes: knapsack 1, tongs 2, bevel gear group 3, motor gear group 4, braces survival panel 5, knapsack 1 include: the backpack comprises a backpack shell 101, a tool box 102, a metal rod A103, a metal rod B104, a metal rod C105, a metal rod bracket 106, a pull rod 107, a metal rod E108, a claw groove 109, a clamping groove 110, a tool clamping groove 111, a rotating wheel groove 112 and a rope groove 113.

The hand grip 2 includes: claw housing 201, bevel gear A202, rumble groove 203, clamping bar 204, timing belt 205, pulley 206, spur gear A207, bevel gear B208, bevel gear C209, rumble 210, metal rod F211, metal rod H212, bearing A213, bearing B214, spur gear B215, and metal rod G216.

The bevel gear group 3 includes: bevel gear D301, bevel gear E302, bevel gear F303, bevel gear G304, bevel gear I306 and metal rod D307.

The motor gear set 4 includes: spur gear C401, spur gear D402, spur gear E403.

The harness survival panel 5 includes: a block 501, a back belt 502, a safety belt 503, a slow descending wheel 504 and a back plate 505.

A tool box 102 is fixedly arranged on the inner side of the backpack shell 101, and a tool clamping groove 111 is fixedly arranged on the inner wall of the tool box 102; the upper end of the metal rod A103 is fixedly connected with the upper plate of the backpack shell 101, and the lower end of the metal rod A103 is propped against the lower plate of the backpack shell 101; one end of a hollow cylinder 114 is fixedly arranged at the inner side of the backpack shell 101, a spring is arranged inside the hollow cylinder 114, the other end of the hollow cylinder 114 is rotatably connected with the rear end of the metal rod B104, and the front end of the metal rod B104 is fixedly connected with the middle frame corner of the pull rod 107; the end part of the metal rod C105 is fixedly connected with the side surface of the metal rod B104; the rear end of the metal rod bracket 106 is fixedly arranged at the inner side of the backpack shell 101; the outer ends of the pull rods 107 extend out of the side slotted holes of the backpack shell 101; four metal rods E108 are provided, two of which are fixedly arranged below the upper plate of the backpack shell 101, and the other two of which are fixedly arranged above the bottom plate of the backpack shell 101; the claw grooves 109 are provided on the side surface of the backpack housing 101; the clamping groove 110 is arranged on the upper end face of the backpack shell 101; the rotating wheel groove 112 is arranged on the front end face of the backpack shell 101; the cord groove 113 is provided on the front end surface of the backpack housing 101.

In an alternative embodiment of the present invention, the claw housing 201 is rotatably mounted at the inner end of the metal rod E108, except for the same components as in the previous embodiment; the bevel gear F303 is fixedly arranged on the claw shell 201 and is positioned on the side surface of the claw shell 201; the bevel gear A202 is fixedly arranged at one end of the metal rod G216, and the bevel gear A202 is connected with a bevel gear F303 through a bearing A213; the wheel groove 203 is arranged at the inner side of the clamping groove of the claw shell 201; the clamping rod 204 is slidably arranged in one end of the clamping jaw of the jaw shell 201, and the rear end of the clamping rod 204 is provided with a spring; the spur gear B215 is fixedly arranged on a metal rod G216, and the rear end of the metal rod G216 is connected with the claw shell 201 through a bearing B214; the synchronous belt 205 wraps the spur gear B215 and the spur gear A207; the pulley 206 is rotatably installed at a corner in the claw shell 201, and the pulley 206 is connected with the synchronous belt 205 in a sliding manner; spur gear a207 is rotatably mounted inside a corner in the pawl housing 201; a bevel gear B208 is rotatably arranged in the claw shell 201, and the bevel gear B208 is meshed with a spur gear B215 at the lower position; the metal rod F211 is fixedly arranged in a round hole on the claw shell 201, the bevel gear C209 is meshed with the bevel gear B208, the bevel gear C209 is fixedly connected with the lower end of the metal rod F211, the upper end of the metal rod F211 is fixedly connected with a wheel 210 on one side, and the wheel 210 is rotatably arranged in a wheel groove 203; the metal rod H212 is fixedly connected to the wheel 210 on the other side, and the metal rod H212 is rotatably mounted in a slot hole of the jaw end of the jaw housing 201.

In an optional implementation manner of the embodiment of the invention, except for the same parts as those in the previous embodiment, a bevel gear D301 is fixedly installed on a rod body of a metal rod B104, and the bevel gear D301 and a bevel gear F303 are meshed with each other; the bevel gear E302 and the bevel gear D301 are meshed with each other, the bevel gear E302 is fixedly connected with the metal rod D307, and a rod body of the metal rod D307 is fixedly connected with a bearing in a circular hole in the front end of the metal rod support 106; the bevel gear G304 is positioned below the bevel gear E302, the bevel gear G304 is fixedly arranged at the lower end of the metal rod D307, the bevel gear G304 is meshed with the bevel gear I306, the bevel gear I306 is rotatably arranged on the metal rod B104, and the bevel gear I306 is meshed with the bevel gear A202.

In an alternative embodiment of the present invention, the spur gear C401 is connected to the motor shaft of the motor, the motor is fixedly mounted in the backpack housing 101, the spur gear C401 is engaged with the spur gear D402 on one side, the spur gear D402 is fixedly mounted at the middle position of the metal rod D307 on the right side, the spur gear D402 is engaged with the spur gear E403, and the spur gear E403 is fixedly mounted at the middle position of the metal rod D307 on the left side, except for the same components as in the previous embodiment.

In an optional implementation manner of the embodiment of the present invention, except for the same components as those in the previous embodiment, the back plate 505 is slidably mounted on the front end surface of the backpack shell 101, the back plate 505 is provided with the fixture block 501, the fixture block 501 is movably engaged with the slot 110, the front end surface of the back plate 505 is provided with the shoulder strap 502, and the front end surface of the back plate 505 is provided with the safety belt 503 at a lower position; the slow descending wheel 504 is rotatably installed in the rotating wheel groove 112, and a slow descending rope in the slow descending wheel 504 is fixedly connected with the buckle on the rear end face of the back plate 505.

The working principle of the invention is as follows: when the power supply is turned on, the motor drives the spur gear C401 to rotate, the spur gear C401 drives the spur gear D402 to rotate, the spur gear D402 drives the spur gear E403 to rotate in opposite directions, so that the two metal rods D307 are synchronously driven to rotate in opposite directions, the metal rods D307 drive the bevel gear G304 to rotate, so that the bevel gear D301 is driven to rotate, and further the bevel gear F303 is driven to rotate, the bevel gear F303 is fixedly arranged on the claw shell 201, so that the claw shell 201 is driven to rotate towards the middle, when the claw shell 201 rotates 90 degrees, the motor stops working, at the moment, the four grippers 2 just rotate out, and when the motor rotates reversely, the four grippers 2 are withdrawn;

after the hand grip 2 rotates out, the pull rods 107 on two sides of the backpack 1 are manually pulled, the bevel gear D301 is disengaged from the bevel gear F303 and the bevel gear E302, the bevel gear I306 is driven by the bevel gear G304 to drive the bevel gear A202 to rotate, the metal rod G216 is driven by the bevel gear A202 to rotate so as to drive the spur gear B215 to rotate, the spur gear B215 and the synchronous belt 205 rotate, the synchronous belt 205 is driven by the pulley 206 and the spur gear A207 to rotate the other spur gear B215 which is rotatably arranged on the claw shell 201, the spur gear B215 at the outer end of the claw shell 201 drives the bevel gear B208 to rotate so as to drive the bevel gear C209 to rotate so as to drive the metal rod F211 to rotate, the metal rod F211 rotates to drive the wheel 210 to rotate, and the vertical force is generated by the invention;

the harness life saving board 5 is an emergency rescue device, when the hand 2 breaks down when going to the half-empty of the base station vertical ladder, and when a person can not go up and down in the half-empty, the hand-operated handle block 501 is separated from the clamping groove 110, because the person carries on the back in the harness 502, the slow-down rope of the slow-down wheel 504 is connected with the back plate 505, and the person is slowly lowered down by the slow-down rope.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Claims

1. The utility model provides an automatic vertical ladder of 5G basic station from top to bottom which characterized in that includes: knapsack (1), tongs (2), bevel gear group (3), motor gear group (4), braces life saving plate (5), knapsack (1) include: the backpack comprises a backpack shell (101), a tool box (102), a metal rod A (103), a metal rod B (104), a metal rod C (105), a metal rod bracket (106), a pull rod (107), a metal rod E (108), a claw groove (109), a clamping groove (110), a tool clamping groove (111), a rotating wheel groove (112) and a rope groove (113);

the tongs (2) include: a claw shell (201), a bevel gear A (202), a rumbling groove (203), a clamping rod (204), a synchronous belt (205), a pulley (206), a spur gear A (207), a bevel gear B (208), a bevel gear C (209), a rumbling (210), a metal rod F (211), a metal rod H (212), a bearing A (213), a bearing B (214), a spur gear B (215) and a metal rod G (216);

the bevel gear set (3) comprises: bevel gear D (301), bevel gear E (302), bevel gear F (303), bevel gear G (304), bevel gear I (306) and metal rod D (307);

the motor gear set (4) comprises: a spur gear C (401), a spur gear D (402), a spur gear E (403);

the harness life saving board (5) comprises: a clamping block (501), a shoulder strap (502), a safety belt (503), a slow descending wheel (504) and a back plate (505);

a tool box (102) is fixedly arranged on the inner side of the backpack shell (101), and a tool clamping groove (111) is fixedly arranged on the inner wall of the tool box (102); the upper end of the metal rod A (103) is fixedly connected with the upper plate of the backpack shell (101), and the lower end of the metal rod A (103) is propped against the lower plate of the backpack shell (101); one end of a hollow cylinder (114) is fixedly arranged on the inner side of the backpack shell (101), a spring is arranged inside the hollow cylinder (114), the other end of the hollow cylinder (114) is rotatably connected with the rear end of a metal rod B (104), and the front end of the metal rod B (104) is fixedly connected with the middle frame corner of a pull rod (107); the end part of the metal rod C (105) is fixedly connected with the side surface of the metal rod B (104); the rear end of the metal rod bracket (106) is fixedly arranged at the inner side of the backpack shell (101); the outer end of the pull rod (107) extends out of a side groove hole of the backpack shell (101); four metal rods E (108) are provided, wherein two of the metal rods E are fixedly arranged below the upper plate of the backpack shell (101), and the other two metal rods E are fixedly arranged above the bottom plate of the backpack shell (101); the claw groove (109) is arranged on the side surface of the backpack shell (101); the clamping groove (110) is arranged on the upper end face of the backpack shell (101); the rotating wheel groove (112) is arranged on the front end surface of the backpack shell (101); the rope groove (113) is arranged on the front end face of the backpack shell (101).

2. An automatic up-down 5G base station vertical ladder as claimed in claim 1, wherein the claw housing (201) is rotatably mounted at the inner end of the metal rod E (108); the bevel gear F (303) is fixedly arranged on the claw shell (201) and is positioned on the side surface of the claw shell (201); the bevel gear A (202) is fixedly arranged at one end of the metal rod G (216), and the bevel gear A (202) is connected with the bevel gear F (303) through a bearing A (213); the wheel groove (203) is arranged at the inner side of the clamping groove of the claw shell (201); the clamping rod (204) is slidably arranged in one end of the clamping jaw of the jaw shell (201), and the rear end of the clamping rod (204) is provided with a spring; the spur gear B (215) is fixedly arranged on a metal rod G (216), and the rear end of the metal rod G (216) is connected with the claw shell (201) through a bearing B (214); the synchronous belt (205) covers the spur gear B (215) and the spur gear A (207); the pulley (206) is rotatably arranged at a corner in the claw shell (201), and the pulley (206) is in sliding connection with the synchronous belt (205); the spur gear A (207) is rotatably installed inside a corner inside the claw shell (201); a bevel gear B (208) is rotatably arranged in the claw shell (201), and the bevel gear B (208) is meshed with a spur gear B (215) at the lower position; the metal rod F (211) is fixedly arranged in a round hole in the claw shell (201), the bevel gear C (209) is meshed with the bevel gear B (208), the bevel gear C (209) is fixedly connected with the lower end of the metal rod F (211), the upper end of the metal rod F (211) is fixedly connected with a roller (210) on one side, and the roller (210) is rotatably arranged in the roller groove (203); the metal rod H (212) is fixedly connected with the wheel (210) on the other side, and the metal rod H (212) is rotatably arranged in a slotted hole at the clamping jaw end of the claw shell (201).

3. The automatic up-down 5G base station vertical ladder as claimed in claim 1, wherein the bevel gear D (301) is fixedly mounted on the body of the metal rod B (104), and the bevel gear D (301) and the bevel gear F (303) are engaged with each other; the bevel gear E (302) is meshed with the bevel gear D (301), the bevel gear E (302) is fixedly connected with the metal rod D (307), and a rod body of the metal rod D (307) is fixedly connected with a bearing in a circular hole at the front end of the metal rod bracket (106); the bevel gear G (304) is positioned below the bevel gear E (302), the bevel gear G (304) is fixedly installed at the lower end of the metal rod D (307), the bevel gear G (304) is meshed with the bevel gear I (306), the bevel gear I (306) is rotatably installed on the metal rod B (104), and the bevel gear I (306) is meshed with the bevel gear A (202).

4. The automatic up-down 5G base station vertical ladder according to claim 1, wherein the spur gear C (401) is connected with a motor shaft of a motor, the motor is fixedly installed in the backpack shell (101), the spur gear C (401) is meshed with the spur gear D (402) on one side, the spur gear D (402) is fixedly installed in the middle of the metal rod D (307) on the right side, the spur gear D (402) is meshed with the spur gear E (403), and the spur gear E (403) is fixedly installed in the middle of the metal rod D (307) on the left side.

5. The automatic vertical ladder for the up-down 5G base station as claimed in claim 1, wherein the back plate (505) is slidably mounted on the front end surface of the backpack shell (101), a clamping block (501) is arranged on the back plate (505), the clamping block (501) is movably buckled with the clamping groove (110), a strap (502) is arranged on the front end surface of the back plate (505), and a safety belt (503) is mounted on the front end surface of the back plate (505) at a lower position; the slow descending wheel (504) is rotatably arranged in the rotating wheel groove (112), and a slow descending rope in the slow descending wheel (504) is fixedly connected with the buckle on the rear end face of the back plate (505).