WO2021042427A1

WO2021042427A1 - Hoistway lift with underneath type traction machine for building construction

Info

Publication number: WO2021042427A1
Application number: PCT/CN2019/108192
Authority: WO
Inventors: 张夏
Original assignee: 歌拉瑞电梯股份有限公司
Priority date: 2019-09-04
Filing date: 2019-09-26
Publication date: 2021-03-11
Also published as: CN210214481U

Abstract

A hoistway lift with an underneath type traction machine for building construction, comprising a traction machine (1), a top beam (2), a traction medium (3), a cage (4), and a counterweight (5), wherein the top beam (2) is fixed at an upper end of a building hoistway (10) and is capable of moving up and down; the traction machine (1) is fixed below the top beam (2); a first wheel set (6) is provided at the top of the cage (4); a second wheel set (7) is provided on the counterweight (5); a third wheel set (8) and a fourth wheel set (9) are provided on the top beam (2); one end of the traction medium (3) is led out from the traction machine (1), and is led downwards to the first wheel set (6) after bypassing the third wheel set (8); the traction medium (3) is led out upwards and fixed after bypassing the first wheel set (6); the other end of the traction medium (3) is led out from the traction machine (1), and is led downwards to the second wheel set (7) after bypassing the fourth wheel set (9); the traction medium (3) is led out upwards and fixed after bypassing the second wheel set (7); the traction medium (3) is a steel wire rope or a steel belt, and the top beam (2) is capable of moving up and down. The lift has the advantages of higher safety, high lifting speed, low noise, and labor saving.

Description

Hoistway elevator for under-mounted traction machine

Technical field

The invention relates to the field of building construction elevators, and in particular to a hoistway elevator for construction with a traction machine installed underneath.

Background technique

Construction elevator is also called construction elevator. Conventional construction elevator is a kind of construction machinery that uses gears and racks to mesh to make the cage move up and down to transport construction personnel, tools, equipment and materials. The disadvantage is the efficiency of lifting Low and noisy. Traditional elevators are installed on the outer walls of high-rise buildings and have low safety.

Summary of the invention

In order to solve one or more of the above-mentioned problems, according to one aspect of the present invention, a

Hoistway elevators for under-mounted traction machines, including traction machines, sky beams, traction media, cages and counterweights;

The sky beam is fixed at the upper end of the building hoistway, and the traction machine is fixed below the sky beam;

There is a first wheel set on the top of the cage, and a second wheel set on the counterweight;

There is a third round group and a fourth round group on the Tianliang;

One end of the traction medium is led out from the traction machine and led to the third wheel set. After bypassing the third wheel set, it is led down to the first wheel set. The traction medium is drawn up and fixed after bypassing the first wheel set. ；

The other end of the traction medium is guided from the traction machine to the fourth wheel set. After bypassing the fourth wheel set, it is guided downwards to the second wheel set. The traction medium bypasses the second wheel set and is drawn upward and fixed. ；

The traction medium is steel wire rope or steel belt, and the sky beam can move up and down.

The beneficial effects of this embodiment are: Compared with the traditional elevators installed on the outer walls of high-rise buildings, the elevators of this embodiment can be arranged in the building hoistway and have higher safety; the traction machine is used to drive the wire rope or steel belt to suspend the cage. Lifting has the advantages of fast lifting speed and low noise; the elevator of this embodiment adopts a lower-mounted traction machine structure, and the two sections of traction medium drawn by the traction machine are guided to the cage and the counterweight, and the traction ratio is 2:1 , Has the advantage of labor-saving.

In some embodiments, the fourth wheel set consists of one pulley or two pulleys.

In some embodiments, the third wheel set consists of one pulley or two pulleys.

In some embodiments, one end of the traction medium is drawn directly upward to the third wheel set after being drawn from the traction machine, and the other end of the traction medium is drawn directly upward to the fourth wheel set after being drawn from the traction machine.

In some embodiments, it further includes a first guide wheel and a second guide wheel. The first guide wheel and the second guide wheel are arranged below the traction system, and a section of the traction medium drawn from the traction system is guided downward to The first guide wheel, after bypassing the first guide wheel, is guided upwards to the third wheel set, another section of traction medium drawn from the traction system is guided downwards to the second guide wheel, and then upwards after bypassing the second guide wheel Lead to the fourth round group.

In some embodiments, the traction medium is connected to the sky beam or a component installed on the sky beam or a separate cross beam.

In some embodiments, at least one of the traction medium drawn from the first wheel set and the traction medium drawn from the second wheel set is fixed in a centrally fixed manner. The beneficial effect of this embodiment is that a sufficient length of the traction medium is reserved after the middle of the traction medium is fixed, and the sky beam is raised by one floor according to the increased value of the floor height, and a certain length of the reserved traction medium is released accordingly. In order to extend the working length of the traction medium, there is no need to replace a new traction medium, and there is no need to adopt a continuous wiring extension method.

In some embodiments, the traction medium is fixed in the middle through a connecting piece. The connecting piece includes a wedge sleeve and a wedge block. The wedge sleeve has an inner cavity with two ends open. One port of the inner cavity is large and the other port is small. It has a big head end and a small head end opposite to the big head end. The outer peripheral surface of the wedge has a groove. The small head end of the wedge is inserted into the cavity from the big mouth end of the inner cavity, and the small mouth end of the inner cavity is set downward to draw the medium. The middle part is folded in half and inserted into the cavity from the small end. The half-folded part is sleeved in the groove on the outer circumferential surface of the wedge. The large end of the wedge is connected to the sky beam or the components installed on the sky beam or another cross beam. The acting force and the opposite force of the wedge sleeve lock the wedge sleeve, the wedge block and the traction medium to each other. The beneficial effect is that one does not need to cut the rope, it can be connected from any position in the middle of the traction medium, and the connection position of the connecting piece on the traction medium can be adjusted at will, so as to release the working length of the traction medium. The characteristics of the lock, the third is fast connection.

In some embodiments, a suspension rod is pivotally connected to the large end of the wedge sleeve, the suspension rod passes through the sky beam or the cross beam, and an elastic component is sleeved on the suspension rod, and the elastic component is located above the sky beam or the cross beam. Both ends of the suspension rod are respectively provided with an elastic component seat, the free end of the boom is provided with at least one limiting nut, and the elastic component is a spring or a rubber ring. The beneficial effect is that the elastic component plays a buffering role.

In some embodiments, the two strands of traction medium protruding from the small mouth end pass through the rope clamp, the rope clamp includes two oppositely arranged splints, the two splints are detachably connected, and the sides of the splints have ribs, two The ribs of the splint are relatively bent to constrain the traction medium in the rope clamp. The two splints can be connected in a detachable manner such as bolts. The role of the rope clamp is to restrain the two strands of traction medium protruding from the small mouth end and prevent the two strands of traction medium from dispersing.

Description of the drawings

Fig. 1 is a schematic structural diagram of a hoistway hoist for construction with a lower traction machine installed in a building hoistway according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a hoistway hoist for construction with a lower traction machine installed in a building hoistway according to another embodiment of the present disclosure.

FIG. 3 is a schematic structural diagram of another embodiment of the present disclosure after the hoistway hoist for construction with a lower traction machine is installed in a building hoistway.

Fig. 4 is a schematic diagram of a hoistway elevator structure for construction with a traction machine under-mounted in another embodiment of the present disclosure after being installed in a building hoistway.

FIG. 5 is a schematic diagram of the structure of the connector in the specific embodiment of the disclosure.

Fig. 6 is a schematic diagram of the connection structure between the connecting member and the sky beam shown in Fig. 5.

Fig. 7 is a schematic diagram of the rope clamp viewed from the AA' direction in Fig. 6.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "inner" and "outer" "Respectively refers to the direction toward or away from the geometric center of a particular component.

According to one aspect of the present disclosure, there is provided a hoistway hoist for construction with a traction machine under-mounted. Figures 1-4 schematically show the structure diagrams of the elevators of the four embodiments of the present disclosure installed in the building hoistway 10.

Hoistway hoist for construction underneath the traction machine, including the traction machine 1, the sky beam 2, the traction medium 3, the cage 4 and the counterweight 5;

The sky beam 2 is fixed at the upper end of the building shaft 10, and the traction machine 1 is fixed below the sky beam 2;

The top of the hanging cage 4 is provided with a first wheel set 6 and the counterweight 5 is provided with a second wheel set 7;

Tianliang 2 has a third round group 8 and a fourth round group 9;

One end of the traction medium 3 is led out from the traction machine 1, leading to the third wheel set 8, and after bypassing the third wheel set 8, it is led down to the first wheel set 6, and the traction medium 3 bypasses the first wheel set. After group 6, lead upwards and fix;

The other end of the traction medium 3 is led out from the traction machine 1, leading to the fourth wheel set 9, after bypassing the fourth wheel set 9, and then directed downwards to the second wheel set 7, and the traction medium 3 bypasses the second wheel set 7. The rear wheel set 7 is drawn upward and fixed;

The traction medium 3 is a steel wire rope or a steel belt, and the sky beam 2 can move up and down.

The elevator of the present disclosure can be installed in a building hoistway 10, such as an elevator hoistway. Compared with a traditional elevator installed outdoors, the safety is improved. The sky beam 2 is horizontally arranged on the top of the building shaft 10, and both ends of the sky beam 2 can be fixed on the wall of the building shaft 10. Whenever the construction of a certain floor is completed, the installation position of the sky beam 2 is raised, and the working length of the traction medium 3 is extended to increase the maximum liftable height of the elevator. The elevator of the specific embodiment of the present disclosure adopts the traction machine 1 to drive the wire rope or steel belt suspension cage 4 to go up and down. Compared with the traditional rack and pinion lifting method, the elevator has the advantages of fast lifting speed and low noise. In order to keep the hanging cage 4 stable, a vertical guide rail is provided on the wall of the building hoistway 10, and the hanging cage 4 is slidingly matched with the guide rail to prevent the hanging cage 4 from shaking. The building hoistway 10 is provided with a door on each floor, and the hanging cage 4 is raised and lowered on the side of the building hoistway 10 with the door. The elevator of the specific embodiment of the present disclosure adopts the under-mounted structure of the traction machine 1. The two sections of traction medium 3 drawn from the traction machine 1 are directly guided to the cage 4 and the counterweight 5, and the traction ratio is 2:1. The elevator has The advantages of labor-saving. The traction medium 3 is a steel wire rope or a steel belt. Steel wire rope is relatively more convenient to manufacture, but the steel belt also has a flat design to increase the contact area and increase the traction friction; at the same time, the steel belt does not require additional lubrication, no oil pollution, lower vibration amplitude than steel wire rope, more stable and comfortable, and economical Electric energy and long service life have their own advantages.

The first wheel group 6, the second wheel group 7, the third wheel group 8 and the fourth wheel group 9 mentioned in the present disclosure play the role of reversing and guiding the movement of the traction medium 3. Each wheel set can include one pulley or a combination of two or more pulleys. For example, in the embodiment shown in FIG. 1, the fourth wheel set 9 includes a first pulley 901 and a second pulley 902 arranged on the left and right, and a section of traction medium 3 drawn upward from the traction system 1 bypasses the first pulley 901 in turn. And the second pulley 902 are guided downward to the second wheel set 7. Please refer to Figure 2. The fourth wheel set 9 can also be a pulley with a suitable diameter. For another example, in the embodiment shown in FIG. 3, the third wheel set 8 includes a third pulley 801 and a fourth pulley 802 arranged on the left and right, and another section of the traction medium 3 drawn upward from the traction system 1 bypasses the first traction medium 3 in turn. The three pulleys 801 and the fourth pulley 802 are guided downwards to the first wheel set 6. Please refer to Figure 4, the third wheel set 8 can also be a pulley with a suitable diameter. Similarly, the first wheel set 6 can also adopt a similar configuration. For example, in the embodiment shown in FIGS. 1-4, the first wheel set 6 is a single pulley. In other embodiments, the first wheel set 6 may also be combined with two pulleys. Those skilled in the art can make a reasonable selection based on the installable space in the hoistway, which will not be exhaustive here.

In the embodiment shown in Figures 1-3, one end of the traction medium 3 is drawn directly upward from the traction machine 1 to the third wheel set 8, and the other end of the traction medium 3 is drawn directly from the traction machine 1 Lead up to the fourth round group 9.

In the embodiment shown in FIG. 4, the elevator further includes a first guide wheel 31 and a second guide wheel 32. The first guide wheel 31 and the second guide wheel 32 are arranged below the traction system 1. The drawn-out section of traction medium 3 is led down to the first guide wheel 31, after bypassing the first guide wheel 31, it is led upward to the third wheel set 8, and the other section of traction medium 3 drawn from the traction system 1 goes down Lead to the second guide wheel 32, bypass the second guide wheel 32 and then lead upward to the fourth wheel set 9.

Optionally, the traction medium 3 is connected to the sky beam 2 or a component installed on the sky beam 2 or a separate cross beam. The section of traction medium 3 drawn from the first wheel set 6 is connected to the sky beam 2, and the other section of traction medium 3 drawn from the second wheel set 7 is connected to the sky beam 2. In some embodiments, a component dedicated to connecting the two sections of traction medium 3 can also be fixed on the sky beam 2. In other embodiments, another cross beam can also be provided, and the two sections of traction medium 3 are connected to the cross beam.

Optionally, at least one of the traction medium 3 drawn from the first wheel set 6 and the traction medium 3 drawn from the second wheel set 7 is fixed in a fixed manner in the middle. For example, the traction medium 3 drawn from the first wheel set 6 is fixed in the middle part, and a sufficient length is left between the middle connection point of the traction medium 3 and the free end of the traction medium 3. The free end of the traction medium 3 drawn from the second wheel set 7 is fixed. For another example, the traction medium 3 drawn from the second wheel set 7 is fixed in the middle part, and a sufficient length is reserved from the middle connection point of the traction medium 3 to the free end of the traction medium 3. The free end of the traction medium 3 drawn from the second wheel set 6 is fixed. For another example, the traction medium 3 drawn from the first wheel set 6 is fixed in the middle part, and the traction medium 3 drawn from the second wheel set 7 is also fixed in the middle part.

Optionally, referring to FIG. 5, the traction medium 3 is fixed in the middle through the connecting piece 30. FIG. 5 is a schematic structural diagram of the connecting member 30 according to a specific embodiment of the disclosure. FIG. 6 is a schematic diagram of the connection structure between the connecting member 30 and the sky beam 2 shown in FIG. 5. 5 and 6, the connector 30 includes a wedge sleeve 12 and a wedge block 13. The wedge sleeve 12 has an inner cavity 14 open at both ends. One port of the inner cavity 14 is large and the other port is small. The wedge 13 has a large end. The end 15 and the small head end 16 opposite to the big head end 15, the outer peripheral surface of the wedge 13 has a groove 17, and the small head end 16 of the wedge 13 is inserted into the inner cavity 14 from the large mouth end 18 of the inner cavity 14. The small end 19 is set downwards, the middle of the traction medium 3 is folded in half and inserted into the cavity 14 from the small end 19, the half-folded part is sleeved in the groove 17 on the outer peripheral surface of the wedge 13, and the large end 18 of the wedge sleeve 12 is connected to the sky beam 2 or The components installed on the sky beam 2 or the additional beam, the force received by the wedge 13 and the reverse force received by the wedge sleeve 12 make the wedge sleeve 12, the wedge block 13 and the traction medium 3 lock each other. The force of the wedge sleeve 12 is opposite to that of the wedge block 13, so the traction medium 3 around the outer circumference of the wedge block 13 is squeezed between the inner wall of the inner cavity 14 and the wedge block 13, and the heavier the cage 4, The traction medium 3 is squeezed tighter. The cross-sectional size of the inner cavity 14 gradually decreases from the large mouth end 18 to the small mouth end 19, so that the inner cavity 14 has a wedge shape. The cross-sectional size of the wedge 13 gradually decreases from the big head end 15 to the small head end 16, so that the wedge 13 has a wedge shape. After the outer circumference of the wedge 13 is wound with a rope, its width is greater than the width of the small mouth end 19 of the inner cavity 14, so the wedge 13 and the traction medium 3 are limited by the wedge-shaped inner wall of the inner cavity 14 and will not fall out of the small mouth end 19. 12. The wedge 13 and the traction medium 3 are locked to each other. When the force exerted on the wedge sleeve 12 is removed, the wedge block 13 is taken out from the large mouth end 18 of the wedge sleeve 12, and the traction medium 3 and the connecting member 30 are disassembled. The advantage of the connecting piece 30 of this embodiment is that it can be connected from any position in the middle of the traction medium 3 without cutting the rope, and the connecting position of the connecting piece 30 on the traction medium 3 can be adjusted as needed to realize the release. The working length of the traction medium 3; second, it has self-locking characteristics; third, the connection is fast. In some embodiments, the large mouth end 18 of the wedge sleeve 12 is connected to a component mounted on the sky beam 2. In other embodiments, the large mouth end 18 of the wedge sleeve 12 is connected to a separate beam.

Optionally, a boom 20 is pivotally connected to the large mouth end 18 of the wedge sleeve 12, the boom 20 passes through the sky beam 2 or a component or beam installed on the sky beam 2, and an elastic component 21 is sleeved on the boom 20 , The elastic component 21 is located above the sky beam 2 or the component or the cross beam installed on the sky beam 2, two ends of the elastic component 21 are each provided with an elastic component seat 22, and the free end of the boom 20 is provided with at least one limit nut 23 , The elastic member 21 is a spring or a rubber ring.

Optionally, the two strands of traction medium 3 protruding from the small mouth end 19 pass through the rope clamp 26. The rope clamp 26 includes two oppositely arranged splints 27. The two splints 27 can be detachably connected, and the sides of the splints 27 have blocks. The side 28 and the ribs 28 of the two clamping plates 27 are relatively bent to constrain the traction medium 3 in the rope clamp 26.

Optionally, in the specific embodiments shown in 5 and FIG. 6, a boom 20 is pivotally connected to the large mouth end 18 of the wedge sleeve 12, the boom 20 passes through the sky beam 2, and the boom 20 is sheathed with an elastic The component 21, the elastic component 21 is located above the sky beam 2, the two ends of the elastic component 21 are each provided with an elastic component seat 22, the free end of the boom 20 is provided with at least one limit nut 23, the elastic component 21 is a spring or a rubber ring . The elastic member 21 serves as a buffer. In some embodiments, the wedge sleeve 12 is connected to the components installed on the sky beam 2 through the boom 20. In other embodiments, the wedge sleeve 12 can also be connected to a separate beam through the boom 20.

Optionally, in the specific embodiment shown in FIG. 5 and FIG. 6, a cushion pad 24 is provided between the sky beam 2 and the elastic component seat 22. The cushion 24 can be made of rubber material, and its function is to reduce the wear of the spring component seat 22. In some embodiments, a cushion 24 is provided between the component mounted on the sky beam 2 and the elastic component seat 22. In other embodiments, a cushion 24 is provided between the additional beam and the elastic member seat 22.

Optionally, in the specific embodiment shown in FIGS. 5 and 6, the free end of the boom 20 is provided with a cotter pin 25, and the cotter pin 25 is located below the limit nut 23. The split pin 25 restricts the limit nut 23 from falling off the boom 20 after long-term use.

Optionally, in the specific embodiment shown in FIG. 6, the traction medium 3 drawn from the small mouth end 19 of the wedge sleeve 11 passes through the rope clamp 26. FIG. 7 schematically shows a schematic view of the rope clamp 26 viewed from the AA' direction of FIG. 6. The rope clamp 26 includes two oppositely arranged splints 27, the two splints 27 are detachably connected, and the sides of the splints 27 have ribs 28 . The ribs 28 of the two clamping plates 27 are relatively bent to confine the rope in the rope clamp 26. The two clamping plates 27 can be connected in a detachable manner such as bolts. The function of the rope clamp 26 is to restrain the two strands of the traction medium 3 protruding from the small mouth end 19 and prevent the two strands of the traction medium 3 from dispersing.

What has been described above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can be made, and these all fall within the protection scope of the present invention.

Claims

A hoistway elevator for construction underneath the traction machine is characterized by including a traction machine (1), a sky beam (2), a traction medium (3), a cage (4) and a counterweight (5);

The sky beam (2) is fixed at the upper end of the building hoistway (10), and the traction machine (1) is fixed below the sky beam (2);

The top of the hanging cage (4) is provided with a first wheel group (6), and the counterweight (5) is provided with a second wheel group (7);

The third wheel group (8) and the fourth wheel group (9) are provided on the sky beam (2);

One end of the traction medium (3) is led out from the traction machine (1), led to the third wheel set (8), after bypassing the third wheel set (8), it is led down to the first wheel Set (6), the traction medium (3) is drawn upwards and fixed after bypassing the first wheel set (6);

The other end of the traction medium (3) is led out from the traction machine (1), led to the fourth wheel set (9), and after bypassing the fourth wheel set (9), it is led down to the second wheel set (9). A wheel set (7), the traction medium (3) is drawn upwards and fixed after bypassing the second wheel set (7);

The traction medium (3) is a steel wire rope or a steel belt, and the sky beam (2) can move up and down.
The hoistway elevator for construction underneath the traction machine according to claim 1, wherein the fourth wheel set (9) is composed of one pulley or two pulleys.
The hoistway elevator for construction under the traction machine according to claim 1, wherein the third wheel set (8) is composed of one pulley or two pulleys.
The hoistway elevator for under-mounted traction machine construction according to claim 1, characterized in that, one end of the traction medium (3) is drawn from the traction machine (1) directly upward to the third wheel group ( 8), the other end of the traction medium (3) is drawn directly from the traction machine (1) to the fourth wheel set (9).
The hoistway elevator for construction under the traction machine according to claim 1, characterized in that it further comprises a first guide wheel (31) and a second guide wheel (32), the first guide wheel (31) and The second guide wheel (32) is arranged below the traction system (1), and a section of the traction medium (3) drawn from the traction system (1) is guided down to the first guide wheel (31), bypassing the first guide wheel (31) and then leading upward to the third wheel set (8), and another section of traction medium (3) drawn from the traction system (1) It is guided down to the second guide wheel (32), bypassed the second guide wheel (32), and then guided up to the fourth wheel set (9).
The winding structure of a traction machine elevator for construction use according to claim 1, wherein the traction medium (3) and the sky beam (2) or components installed on the sky beam (2) or Another beam connection.
The hoistway lifter for construction underneath the traction machine according to any one of claims 1-6, characterized in that the traction medium (3) drawn from the first wheel set (6) and the traction medium (3) drawn from the first wheel set (6) and the first At least one of the traction media (3) drawn by the second wheel set (7) is fixed in a fixed manner in the middle.
The hoistway lifter for construction underneath the traction machine according to claim 7, characterized in that the traction medium (3) is fixed in the middle through a connecting piece (30), and the connecting piece (30) includes a wedge sleeve (12) and a wedge (13). The wedge (12) has an inner cavity (14) open at both ends. One port of the inner cavity (14) is large and the other port is small. The wedge (12) 13) It has a big head end (15) and a small head end (16) opposite to the big head end (15), the outer peripheral surface of the wedge (13) has a groove (17), the wedge (13) The small head end (16) of the inner cavity (14) is inserted into the inner cavity (14) from the large mouth end (18) of the inner cavity (14), the small mouth end (19) of the inner cavity (14) is set downward, and the drag The middle part of the guiding medium (3) is folded in half and inserted into the inner cavity (14) from the small mouth end (19), and the folded part is sleeved in the groove (17) on the outer peripheral surface of the wedge block (13), and the wedge sleeve The large mouth end (18) of (12) is connected to the sky beam (2) or the components installed on the sky beam (2) or another cross beam, the force of the wedge (13) and the wedge The reverse force of the sleeve (12) causes the wedge sleeve (12), the wedge block (13) and the traction medium (3) to be locked to each other.
The hoistway elevator for under-mounted traction machine construction according to claim 8, characterized in that, a boom (20) is pivotally connected to the large mouth end (18) of the wedge sleeve (12), and the boom (20) is pivotally connected to the large mouth end (18) of the wedge sleeve (12). (20) Passing through the sky beam (2) or parts or beams installed on the sky beam (2), an elastic component (21) is sleeved on the boom (20), the elastic component (21) Located above the sky beam (2) or components or cross beams installed on the sky beam (2), two ends of the elastic member (21) are each provided with an elastic member seat (22), and the boom (20) The free end of) is provided with at least one limiting nut (23), and the elastic component (21) is a spring or a rubber ring.
The hoistway elevator for construction underneath the traction machine according to claim 8, wherein the two traction media (3) protruding from the small mouth end (19) pass through the rope clamp (26), so The rope clamp (26) includes two splints (27) arranged oppositely, the two splints (27) are detachably connected, the sides of the splints (27) have ribs (28), and the two splints The rib (28) of (27) is relatively bent to constrain the traction medium (3) in the rope clamp (26).