CN113353859B

CN113353859B - Anti-falling elevator

Info

Publication number: CN113353859B
Application number: CN202110916202.0A
Authority: CN
Inventors: 程丽萍; 李冰; 张郁葱
Original assignee: Foshan Guangtao Mechanical And Electrical Equipment Co ltd
Current assignee: Foshan Guangtao Mechanical And Electrical Equipment Co ltd
Priority date: 2021-08-11
Filing date: 2021-08-11
Publication date: 2021-10-29
Anticipated expiration: 2041-08-11
Also published as: CN113353859A

Abstract

The invention belongs to the field of elevators. The invention provides an anti-falling elevator, wherein a bearing plate and a base are hinged with a crawling ladder, the crawling ladder comprises a plurality of unit steps, each unit step comprises a pedal and a connecting pipe, the two ends of each pedal are connected with the connecting pipes, and the connecting pipe of one unit step above is inserted into the connecting pipe of one unit step below; the lower part of the connecting pipe is connected with a connecting nail, the lower part of the connecting pipe is provided with an avoiding through hole, the upper part of the connecting pipe is provided with a first connecting hole, and the connecting nail is movably connected with the connecting pipe; the connecting nail on one connecting pipe can partially extend out of the connecting pipe from the avoiding through hole and is connected with the first connecting hole of the other connecting pipe; the connecting nail on one connecting pipe can be disconnected with the first connecting hole and completely returns into the connecting pipe from the avoiding through hole; the connecting nail is made of iron or steel. This prevent weighing down lift's benefit is when the loading board has the risk of falling, and the cat ladder can be used for supporting the loading board, avoids causing great vibration.

Description

Anti-falling elevator

Technical Field

The invention relates to the field of lifting power mechanisms, in particular to an anti-falling lifter.

Background

CN112079279A patent application of chinese invention discloses an anti-falling device for elevator, which comprises a base, a first anti-falling mechanism, a cover frame, a second anti-falling mechanism and a winding drum, wherein the first belt pulley is connected with the second belt pulley through a driving belt, a driving shaft penetrates through the second anti-falling mechanism, the winding drum is connected with the front and rear ends of the driving shaft, a lifting rope is wound around the outer side of the winding drum, the lifting rope is connected with a tension sensor through a fixed pulley, the tension sensor is fixed on the left and right sides of the upper end surface of the bearing plate through a fastener, and the tension sensor is located on the outer side of the limit plate. This a falling preventing device for lift, after the loading board was hoisted to the lifting rope, force sensor began working, and when the unexpected fracture of lifting rope, the pulling force value that corresponding force sensor detected was zero, and the movable block moved under the extension effect of first piston rod this moment, and the second fixture block removes thereupon and the block is connected on first fixture block, conveniently in time fixes the loading board, prevents that the loading board from slope or falling.

The problem that prior art exists is that, the piston rod needs certain time just can promote the second fixture block and the block is connected on first fixture block, consequently, when the loading board falls because of the accident, before second fixture block and the complete block of first fixture block, the lift can produce great vibration, leads to the power unit damage of lift easily, for example the hydro-cylinder card dies or the output shaft fracture etc. of motor.

Therefore, the prior art is in need of improvement.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: when the loading board falls due to accident, the elevator can generate larger vibration, which easily causes the damage of the power mechanism of the elevator.

In order to achieve the purpose, the specific technical scheme of the invention is as follows:

an anti-falling elevator comprises a base, a bearing plate, a lifting power mechanism and a ladder stand, wherein the top of the lifting power mechanism is connected with the bearing plate, the lifting power mechanism is connected with the base, the bearing plate and the base are both hinged with the ladder stand, the ladder stand comprises a plurality of unit steps, each unit step comprises a pedal and a connecting pipe, the two ends of each pedal are both connected with the connecting pipes, the connecting pipe of one unit step above is inserted into the connecting pipe of one unit step below, and the connecting pipes which are inserted with each other can slide relatively; an avoidance through hole is formed in the lower portion of the connecting pipe, a connecting nail is arranged in the connecting pipe at a position corresponding to the avoidance through hole, a first connecting hole is formed in the upper portion of the connecting pipe, and the connecting nail is movably connected with the connecting pipe; when the two mutually inserted connecting pipes slide relatively for a certain distance, the connecting nail on one connecting pipe can partially extend out of the connecting pipe from the avoiding through hole and is connected with the first connecting hole of the other connecting pipe under the action of external force; under the action of reverse external force, the connecting nail on one connecting pipe can be disconnected with the first connecting hole and completely retreated into the connecting pipe from the avoiding through hole; the connecting nail is made of iron or steel, and the external force and the reverse external force are both magnetic forces of the magnets.

As a further improvement of the above technical solution, the unit step further includes a positioning block, the positioning block is disposed in the connecting tube and fixedly connected to the connecting tube, a stepped hole is disposed in the positioning block, the stepped hole includes a locking section and a limiting section, an annular protrusion is disposed in the locking section, a first annular groove and a second annular groove are disposed on the connecting nail, a limiting head is disposed at one end of the connecting nail, the first annular groove is disposed between the second annular groove and the limiting head, the limiting head is disposed in the limiting section, and both the first annular groove and the second annular groove are used for being connected to the protrusion; the ladder stand further comprises a driving block, the driving block comprises a torsion spring and two connecting pieces, the two connecting pieces are hinged with each other through the torsion spring, the two connecting pieces are clamped on the outer wall of the connecting pipe, and the driving block can slide along the length direction of the connecting pipe; the lower end or the upper end of the driving block is connected with two magnetic blocks, an avoiding gap is arranged between the two magnetic blocks, and the magnetic blocks are used for attracting the connecting nail; connecting a driving block to one side of the connecting pipe, which is provided with an avoidance through hole, placing the driving block in a downward direction according to the two magnetic suction blocks, moving the connecting nail out of the connecting pipe and connecting the connecting nail with the first connecting hole when the driving block slides upwards along the connecting pipe and is close to the connecting nail, wherein the first annular groove can be connected with the bulge part, and meanwhile, the limiting head is abutted against the joint of the locking section and the limiting section; connect the drive block in keep away from the one side of dodging the through-hole on the connecting pipe, work as the drive block is followed the connecting pipe slides down and is close to when connecting the nail, it removes to connect the nail to remove in the connecting pipe, second annular groove can with the bellying is connected, it gets into completely to connect the nail in the connecting pipe.

As a further improvement of the technical scheme, the ladder stand further comprises a grab rail, the grab rail comprises a plurality of sleeves which are sequentially connected in an inserting manner, the connecting pipe is arranged in an inclined manner, the sleeves are arranged obliquely above the connecting pipe and are parallel to the connecting pipe, a gap is arranged between each sleeve and the connecting pipe, and the bearing plate and the base are both hinged to the grab rail; the safety ring is sleeved on the grab rail and is connected with the grab rail in a sliding way, and the safety ring is connected with a safety rope; be equipped with the second connecting hole on the bar, the second connecting hole with first connecting hole collineation, the one end of connecting the nail can stretch into in the second connecting hole.

As a further improvement of the technical scheme, the middle part and the end part of the safety rope are respectively provided with a male buckle and a female buckle, and the male buckle and the female buckle can be mutually buckled.

As a further improvement of the technical scheme, the connecting pipe and the sleeve are both made of aluminum alloy.

As a further improvement of the technical scheme, the number of the first connecting holes on one connecting pipe is more than two.

As a further improvement of the above technical scheme, the lifting power mechanism is a hydraulic scissor lifting power mechanism, the middle of the lifting power mechanism is connected with a transition platform, the two crawling ladders are respectively located on the left side and the right side of the lifting power mechanism, two ends of one crawling ladder are respectively hinged to the right side of the bearing plate and the right side of the transition platform, and two ends of the other crawling ladder are respectively hinged to the left side of the transition platform and the left side of the base.

The invention has the beneficial effects that: and controlling the lifting height of the bearing plate to be a certain value, so that the positions of the avoidance through hole on the upper connecting pipe and the first connecting hole on the lower connecting pipe are overlapped or partially overlapped. Then, in the process that the operator climbs upwards from the ladder stand, the connecting nails are pulled outwards from the connecting pipes by using the external magnets, so that the connecting nails are connected with the first connecting holes, the positions of the adjacent unit steps can be locked with each other, and the length of the ladder stand is fixed.

When the length of cat ladder is fixed the back, if because of reasons such as lifting power mechanism trouble, for example the oil pipe of hydro-cylinder bursts or the motor loses efficacy suddenly, leads to the loading board to lose to support and has the risk of falling, and the cat ladder can be used for supporting the loading board, avoids the loading board to fall suddenly and arouses great vibration, can protect the lift.

The operator is from the in-process that the cat ladder climbed downwards, utilizes the magnet of peripheral hardware will follow another direction attraction and connects the nail, can be with connecting the nail to pulling in the connecting tube for connecting nail and first connecting hole disjunctor, can be with the mutual unblock of adjacent unit step, the cat ladder can contract, and the loading board can descend under elevating power unit's effect.

Drawings

FIG. 1 is a front elevational view of the fall arrest elevator of the present invention;

FIG. 2 is a schematic view of the connection of two unit steps of the present invention;

FIG. 3 is a schematic view showing the connection of parts of the ladder of the present invention;

figure 4 is a cross-sectional view of part of the ladder of the present invention during an operator ascending the ladder;

figure 5 is a cross-sectional view of part of the ladder of the invention during the descending movement of an operator along the ladder;

FIG. 6 is a perspective view of the drive block of the present invention;

FIG. 7 is a cross-sectional view of the locating block of the present invention;

FIG. 8 is a cross-sectional view of the attachment nail of the present invention;

FIG. 9 is a cross-sectional view of a connecting tube of the present invention;

fig. 10 is a cross-sectional view of a cannula of the present invention.

In the figure: 1-base, 2-bearing plate, 3-ladder stand, 31-unit step, 311-pedal, 312-connecting pipe, 3121-avoidance through hole, 3123-first connecting hole, 313-connecting nail, 3131-first annular groove, 3132-second annular groove, 3133-limiting head, 314-locating block, 3141-locking section, 3142-limiting section, 3143-bulge, 32-handrail rod, 321-sleeve, 3211-second connecting hole, 33-safety ring, 34-safety rope, 35-male buckle, 36-female buckle, 4-driving block, 41-torsion spring, 42-connecting piece, 43-magnetic attraction block, 5-lifting power mechanism and 6-transition platform.

Detailed Description

The invention is described in detail below with reference to specific embodiments.

As shown in fig. 1 to 10, the embodiment of the anti-falling lift of the present invention specifically includes:

an anti-falling elevator comprises a base 1, a bearing plate 2, a lifting power mechanism 5 and a ladder stand 3, wherein the top of the lifting power mechanism 5 is connected with the bearing plate 2, the bottom of the lifting power mechanism 5 is connected with the base 1, the bearing plate 2 and the base 1 are both hinged with the ladder stand 3, the ladder stand 3 comprises a plurality of unit steps 31, each unit step 31 comprises a pedal 311 and a connecting pipe 312, the connecting pipes 312 are connected with two ends of each pedal 311, the connecting pipe 312 of one unit step 31 above is inserted into the connecting pipe 312 of the other unit step 31 below, and the connecting pipes 312 inserted into each other can slide relatively; the lower part of the connecting pipe 312 is provided with an avoiding through hole 3121, a connecting nail 313 is arranged in the connecting pipe 312 at a position corresponding to the avoiding through hole 3121, the upper part of the connecting pipe 312 is provided with a first connecting hole 3123, and the connecting nail 313 is movably connected with the connecting pipe 312; when the two connecting pipes 312 inserted into each other slide a certain distance relatively, under the action of external force, the connecting pin 313 on the upper connecting pipe 312 can partially extend out of the connecting pipe 312 from the avoiding through hole 3121 and is connected with the first connecting hole 3123 of the lower connecting pipe 312; under the action of reverse external force, the connecting nail 313 can be disconnected from the first connecting hole 3123 and completely withdrawn from the avoiding through hole 3121 into the connecting pipe 312; the connecting nail 313 is made of iron or steel, and the external force and the reverse external force are both magnetic force of the magnet.

The principle of the present invention is that when the elevating power mechanism 5 drives the carrier plate 2 to ascend, the connection pipes 312 of the unit steps 31 slide relative to each other, and the ladder 3 is stretched. When the rising height of the carrier plate 2 is controlled to a certain value, the positions of the escape through hole 3121 of the upper one of the connection pipes 312 and the first connection hole 3123 of the lower one of the connection pipes 312 can be overlapped or partially overlapped. Then, the operator pulls the coupling pin 313 outward from the coupling tube 312 using an external magnet during climbing up from the ladder 3 so that the coupling pin 313 is coupled with the first coupling hole 3123, and the coupling pin 313 locks positions of the adjacent unit steps 31 to each other; when the positions of all the unit steps 31 are locked to each other, the length of the ladder stand 3 is fixed. Because the length of cat ladder 3 is fixed, if 5 troubles of power that goes up and down, for example, the oil pipe of hydro-cylinder bursts or the motor loses efficacy suddenly, lead to bearing plate 2 to lose to support and have the risk of falling, cat ladder 3 can be used for supporting bearing plate 2, avoids bearing plate 2 to fall suddenly and arouses great vibration, plays the effect of protection lift. In addition, while the operator climbs the ladder stand 3 downward, the connection pin 313 is attracted from the other direction by the magnet provided outside, and the connection pin 313 can be pulled into the connection pipe 312, so that the connection pin 313 is disconnected from the first connection hole 3123, and the adjacent unit steps 31 are unlocked from each other, and the ladder stand 3 can be retracted after the unit steps 31 are unlocked from each other, and the carrier plate 2 can be moved downward by the elevating power mechanism 5.

As a preferred embodiment, the unit step 31 further includes a positioning block 314, the positioning block 314 is disposed in the connecting pipe 312 and fixedly connected to the connecting pipe 312, a stepped hole is disposed in the positioning block 314, the stepped hole includes a locking section 3141 and a limiting section 3142, an annular protrusion 3143 is disposed in the locking section 3141, a first annular groove 3131 and a second annular groove 3132 are disposed on the connecting peg 313, a limiting head 3133 is disposed at one end of the connecting peg 313, the first annular groove 3131 is disposed between the second annular groove 3132 and the limiting head 3133, the limiting head 3133 is disposed in the limiting section 3142, and both the first annular groove 3131 and the second annular groove 3132 are used for connecting to the protrusion 3143; the ladder stand 3 further comprises a driving block 4, the driving block 4 comprises a torsion spring 41 and two connecting pieces 42, the two connecting pieces 42 are hinged to each other through the torsion spring 41, the two connecting pieces 42 are clamped on the outer wall of the connecting pipe 312, and the driving block 4 can slide along the length direction of the connecting pipe 312; the lower end or the upper end of the driving block 4 is connected with two magnetic blocks 43, an avoiding gap is arranged between the two magnetic blocks 43, and the magnetic blocks 43 are used for attracting the connecting nail 313; connecting the driving block 4 to one side of the connecting pipe 312 provided with the avoiding through hole 3121, placing the driving block 4 in a direction that the two magnetic blocks 43 face downward, when the driving block 4 slides upward along the connecting pipe 312 and approaches the connecting nail 313, the connecting nail 313 moves outward of the connecting pipe 312 and is connected with the first connecting hole 3123, the first annular groove 3131 can be connected with the protruding portion 3143, and simultaneously the limiting head 3133 abuts against the connection between the locking section 3141 and the limiting section 3142; when the driving block 4 is connected to the connecting tube 312 at a side away from the escape through hole 3121, and the driving block 4 slides down the connecting tube 312 and approaches the connecting peg 313, the connecting peg 313 moves into the connecting tube 312, the second annular groove 3132 can be connected to the protrusion 3143, and the connecting peg 313 completely enters the connecting tube 312.

The principle of the embodiment is that after the bearing plate 2 is driven by the lifting power mechanism 5 to rise for a certain distance, in the process that an operator moves upwards along the ladder stand 3, the driving block 4 is connected to one side of the connecting pipe 312 provided with the avoidance through hole 3121, and the magnetic block 43 sucks out the connecting nails 313 from the connecting pipe 312 one by one, so that two adjacent unit steps 31 are fixed to each other; in the process that the operator ascends, the unit steps 31 positioned below the operator can be locked with each other, even if the loading plate 2 accidentally falls in the process that the operator ascends a half way, the part of the crawling ladder 3 below the operator can be prevented from being shortened, and therefore the safety of the operator is guaranteed. In the descending process of the crawling ladder 3, an operator connects the driving block 4 to one side, far away from the avoiding through hole 3121, of the connecting pipe 312, the connecting nails 313 are sucked into the connecting pipe 312 one by one, the safety of the operator in the descending process can be guaranteed, and when the operator goes up and down from the crawling ladder 3 to the base 1, all unit steps 31 can be unlocked. The first annular groove 3131 connected to the protrusion 3143 can prevent the connection pin 313 from being withdrawn into the connection pipe 312 by itself, and the second annular groove 3132 connected to the protrusion 3143 can reduce the tendency of the connection pin 313 to collide with the connection pipe 312.

As a further preferred embodiment, the ladder stand 3 further includes a grab bar 32, the grab bar 32 includes a plurality of sleeves 321 connected in an inserted manner in sequence, the connecting pipe 312 is arranged obliquely, the sleeves 321 are arranged obliquely above the connecting pipe 312, the sleeves 321 are parallel to the connecting pipe 312, a gap is arranged between the sleeves 321 and the connecting pipe 312, and the bearing plate 2 and the base 1 are both hinged to the grab bar 32; a safety ring 33 is sleeved on the grab rail 32, the safety ring 33 is connected with the grab rail 32 in a sliding way, and a safety rope 34 is connected on the safety ring 33; a second connecting hole 3211 is formed in the grab bar 32, the second connecting hole 3211 is collinear with the first connecting hole 3123, and one end of the connecting nail 313 can extend into the second connecting hole 3211.

In this embodiment, the safety rope 34 is used for being tied up on an operator, when the operator moves upwards, one hand pushes the safety ring 33 to slide obliquely upwards along the grab bar 32, the other hand pushes the driving block 4 to slide obliquely upwards along the connecting pipe 312, when the safety ring 33 slides for a certain distance, the driving block 4 is pushed to suck out the connecting nail 313 below the safety ring 33 obliquely, the connecting nail 313 passes through the first connecting hole 3123 and then is connected with the second connecting hole 3211, at this time, under the action of the connecting nail 313, the path along which the safety ring 33 slides obliquely downwards is blocked, and since the operator is connected with the safety ring 33 through the safety rope 34, the safety ring 33 can ensure that the operator does not fall. The operator can also safely stay at each position on the ladder stand 3, so that the operator can work at each height without changing the height of the bearing platform to change the height of the work, thereby facilitating the work.

In a further preferred embodiment, the middle and the end of the safety rope 34 are respectively provided with a male buckle 35 and a female buckle 36, and the male buckle 35 and the female buckle 36 can be fastened to each other. The benefit of this embodiment is the ease of tying the safety line 34 to the operator.

As an alternative embodiment, the connecting tube 312 and the sleeve 321 are made of aluminum alloy. The aluminum alloy has the advantage that the quality is light and intensity is high, and the process of tensile cat ladder 3 and handrail pole 32 can the energy saving to can provide stronger supporting force for loading board 2.

In alternative embodiments, the number of the first connection holes 3123 on one connection pipe 312 is two or more. The advantage of this embodiment is that the attachment peg 313 can be attached to different first attachment holes 3123, and the length of the ladder 3 after being pulled up can be selected to a greater extent.

The lifting power mechanism 5 is a hydraulic scissor lifting power mechanism, the middle of the lifting power mechanism 5 is connected with a transition platform 6, the number of the crawling ladders 3 is two, the crawling ladders 3 are respectively positioned on the left side and the right side of the lifting power mechanism 5, two ends of one crawling ladder 3 are respectively hinged to the right side of the bearing plate 2 and the right side of the transition platform 6, and two ends of the other crawling ladder 3 are respectively hinged to the left side of the transition platform 6 and the left side of the base 1. The benefit of this embodiment is, when power unit fails suddenly, and loading board 2 has the risk of falling, needs satisfy two cat ladder 3 all contracts or all breaks, and loading board 2 just can fall to the lower extreme, and consequently, the reliability of preventing weighing down the lift of this embodiment is higher. In addition, the two crawling ladders 3 are respectively positioned on the left side and the right side of the lifting power mechanism 5, so that the gravity center deviation degree of the anti-falling lifter can be reduced to a certain degree, and the anti-falling lifter is prevented from inclining.

The features of the embodiments and embodiments described above may be combined with each other without conflict.

In the description of the present invention, it should be understood that "a plurality" of the present invention means three or more in number, and the terms "length", "upper", "lower", "top", "bottom", "inner", "outer", "circumferential" and the like indicate orientations or positional relationships based on those shown in the drawings, which are merely for convenience of description and simplification of description, but do not indicate or imply that the referred device or element 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.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. The utility model provides a prevent weighing down lift, includes base, loading board, lifting power unit and cat ladder, lifting power unit's top with the loading board is connected, lifting power unit with the base is connected, the loading board with the base all with the cat ladder is articulated, its characterized in that: the ladder stand comprises a plurality of unit steps, each unit step comprises a pedal and connecting pipes, the connecting pipes are connected to two ends of each pedal, the connecting pipe of one unit step above is inserted into the connecting pipe of one unit step below, and the connecting pipes inserted into each other can slide relatively; an avoidance through hole is formed in the lower portion of the connecting pipe, a connecting nail is arranged in the connecting pipe at a position corresponding to the avoidance through hole, a first connecting hole is formed in the upper portion of the connecting pipe, and the connecting nail is movably connected with the connecting pipe; when the two mutually inserted connecting pipes slide relatively for a certain distance, the connecting nail on one connecting pipe can partially extend out of the connecting pipe from the avoiding through hole and is connected with the first connecting hole of the other connecting pipe under the action of external force; under the action of reverse external force, the connecting nail on one connecting pipe can be disconnected with the first connecting hole and completely retreated into the connecting pipe from the avoiding through hole; the connecting nail is made of iron or steel, and the external force and the reverse external force are both magnetic force of the magnet;

the unit step further comprises a positioning block, the positioning block is arranged in the connecting pipe and fixedly connected with the connecting pipe, a stepped hole is formed in the positioning block, the stepped hole comprises a locking section and a limiting section, an annular bulge is formed in the locking section, a first annular groove and a second annular groove are formed in the connecting nail, a limiting head is arranged at one end of the connecting nail, the first annular groove is formed between the second annular groove and the limiting head, the limiting head is arranged in the limiting section, and the first annular groove and the second annular groove are both used for being connected with the bulge;

the ladder stand further comprises a driving block, the driving block comprises a torsion spring and two connecting pieces, the two connecting pieces are hinged with each other through the torsion spring, the two connecting pieces are clamped on the outer wall of the connecting pipe, and the driving block can slide along the length direction of the connecting pipe; the lower end or the upper end of the driving block is connected with two magnetic blocks, an avoiding gap is arranged between the two magnetic blocks, and the magnetic blocks are used for attracting the connecting nail;

connecting a driving block to one side of the connecting pipe, which is provided with an avoidance through hole, placing the driving block in a downward direction according to the two magnetic suction blocks, moving the connecting nail out of the connecting pipe and connecting the connecting nail with the first connecting hole when the driving block slides upwards along the connecting pipe and is close to the connecting nail, wherein the first annular groove can be connected with the bulge part, and meanwhile, the limiting head is abutted against the joint of the locking section and the limiting section;

connect the drive block in the connecting pipe is kept away from the one side of dodging the through-hole, works as the drive block is followed the connecting pipe slides down and is close to when connecting the nail, it removes to connect the nail to remove in the connecting pipe, second annular groove can with the bellying is connected, it gets into completely to connect the nail in the connecting pipe.

2. The fall arrest lift according to claim 1, characterized in that: the ladder stand further comprises a grab rail, the grab rail comprises a plurality of sleeves which are sequentially connected in an inserting mode, the connecting pipe is arranged in an inclined mode, the sleeves are arranged above the connecting pipe in an inclined mode, the sleeves are parallel to the connecting pipe, a gap is formed between each sleeve and the corresponding connecting pipe, and the bearing plate and the base are hinged to the grab rail; the safety ring is sleeved on the grab rail and is connected with the grab rail in a sliding way, and the safety ring is connected with a safety rope; be equipped with the second connecting hole on the bar, the second connecting hole with first connecting hole collineation, the one end of connecting the nail can stretch into in the second connecting hole.

3. The fall arrest lift according to claim 2, characterized in that: the middle part and the tip of safety rope are equipped with pin thread and box respectively, the pin thread with the box can lock joint each other.

4. The fall arrest lift according to claim 2, characterized in that: the connecting pipe and the sleeve are made of aluminum alloy.

5. The fall arrest lift according to claim 1, characterized in that: the number of the first connecting holes on one connecting pipe is more than two.

6. The fall arrest lift according to claim 1, characterized in that: the lifting power mechanism is a hydraulic scissor lifting power mechanism, the middle of the lifting power mechanism is connected with a transition platform, the number of the crawling ladders is two, the two crawling ladders are respectively located on the left side and the right side of the lifting power mechanism, two ends of one crawling ladder are respectively hinged to the right side of the loading plate and the right side of the transition platform, and two ends of the other crawling ladder are respectively hinged to the left side of the transition platform and the left side of the base.