A reciprocating double-guide rail vertical hydraulic winch

Abstract

The present invention relates to the field of winch technology, and more particularly to a reciprocating dual-guide rail vertical hydraulic winch, comprising a winch body for winding a steel wire rope fixedly connected to one end of a bundle of steel strands, and pulling the entire bundle of steel strands into a prestressed pipe by winding the wire rope. The winch body is placed on a liftable construction platform. When winding the wire rope, the winch body falls on a buttress at the mouth of the prestressed pipe and is driven away from the support of the construction platform by the reverse force of the wire rope. The present invention provides a hydraulic winch capable of pulling in an entire bundle of steel strands at once without requiring a fixed position.

Description

Technical Field

[0001] The present invention relates to the technical field of winches, in particular to a reciprocating double-guide rail vertical hydraulic winch. Background Art

[0002] In the prestressed construction of large structures (such as nuclear power plant containment vessels, liquefied natural gas storage tanks, etc.), horizontal bundle threading operations require inserting multiple long steel strands into prestressed pipes at different heights. The traditional construction method is to place a bundle threading machine on the construction platform and use it to thread the steel strands into the pipe one by one. This is quite difficult, especially the last few steel strands. Therefore, a winch is needed that can pull the entire bundle of steel strands into the pipe. Usually, the winch is horizontally fixed to the ground or platform with a ground anchor. However, during bundle threading construction, the pulling force required to pull in the entire bundle of steel strands is large, and fixing it on the platform poses a great safety hazard. Therefore, a winch structure that can be easily adjusted and does not need to be fixed to the construction platform is required. At the same time, this structure can be placed on the construction platform and move up and down with the platform. Summary of the Invention

[0003] The object of the present invention is to provide a reciprocating double-guide rail vertical hydraulic winch to solve the technical problems existing in the above-mentioned background technology.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] A reciprocating double-guide rail vertical hydraulic winch includes: a winch body, the winch body is used to reel in a steel wire rope fixedly connected to one end of a whole bundle of steel strands, and the whole bundle of steel strands is pulled into a prestressed pipe by reeling in the steel wire rope. The winch body is placed on a liftable construction platform. When reeling in the steel wire rope, the winch body falls on the buttress column at the mouth of the prestressed pipe, and the winch body is driven away from the support of the construction platform by the reverse force of the steel wire rope.

[0006] Furthermore, the winch body includes a skeleton, a column, a winch assembly, a winch leg assembly, a rope-laying mechanism, a power-assisted winch, and a leg assembly. The skeleton includes a sun-shaped top frame and a mouth-shaped side frame. The mouth-shaped side frame is fixedly connected to the left side of the bottom end of the sun-shaped top frame. There are four columns, and the four columns are symmetrically fixedly installed on the front and rear sides of the bottom end of the sun-shaped top frame. There are four groups of winch leg assemblies, and the four groups of winch leg assemblies are symmetrically and slidingly connected to two double tracks symmetrically arranged on the front and rear sides of the inner end of the sun-shaped top frame. The bottom ends of the four winch leg assemblies are respectively fixedly connected to the left sides of the top of the winch assembly. The rope-laying mechanism is used to drive the winch assembly to move back and forth left and right. The power-assisted winch is fixedly installed on the lower right end of the winch assembly. The bottom end of the column is provided with a length-adjustable leg assembly.

[0007] Furthermore, it also includes a multi-way valve and a pilot valve, and the multi-way valve, the pilot valve and the corresponding balance valve are respectively installed at the bottom end of the sun-shaped top frame.

[0008] Furthermore, it also includes a crossbeam and a support beam, wherein two crossbeams are provided, and two columns on the same side in the front and rear are fixed together by a crossbeam, and one end of the two support beams are symmetrically fixed on the lower outer ends of the two columns on the front and rear sides of the left end, and the other ends of the two support beams are symmetrically fixed on the front and rear sides of the lower right end of the mouth-shaped side frame.

[0009] Furthermore, the winch assembly includes a mounting seat, a drum, a rope presser, a motor oil port flange, a drum end cover and a round rod. Two mounting seats are symmetrically arranged on the left and right, the drum is arranged between the two mounting seats, two drum end covers are provided, and the two drum end covers are symmetrically arranged at both ends of the drum. The outer ends of the two drum end covers are respectively sealed and rotatably connected to the two motor oil port flanges. The two motor oil port flanges are respectively fixed to the inner ends facing each other of the two mounting seats by a number of fixing bolts distributed in a circular array. There are four round rods, and the four round rods are respectively arranged at the upper and lower front and rear positions between the two mounting seats. The rope presser is installed on one of the round rods.

[0010] Furthermore, the winch leg assembly includes a support, a copper sleeve 1, a small wheel, a cover plate, a pin shaft, a pressure plate, a roller bracket, an end cover, a copper sleeve 2, a large wheel and a copper sleeve 3. The outer side of the support is rotatably connected to the middle of the roller bracket through the copper sleeve 3, and the outer end of the support is fixedly installed with the end cover; the large wheel is rotatably connected to the middle of the pin shaft through two copper sleeves 2 arranged symmetrically in front and behind, and the pin shaft is pinned to the left and right sides of the roller bracket, and two pressure plates are fixedly installed on the left and right sides of the upper part of the roller bracket near one end of the support, and the pressure plate presses the end surface of the pin shaft near the support toward one side of the roller bracket; the small wheel is rotatably connected to the fixed shaft arranged at the top end of the support near the roller bracket through the copper sleeve 1, and a cover plate is fixedly installed on the top of the fixed shaft; the large wheel and the small wheel are respectively connected to the double tracks in a transverse rolling manner, and the support is fixedly installed on one side of the top of the mounting seat.

[0011] Furthermore, the rope-laying mechanism includes a rope-laying cylinder, and there are two rope-laying cylinders. The two rope-laying cylinders are symmetrically placed horizontally on the front and rear sides of the bottom end of the skeleton. The rope-laying cylinder includes a piston rod and a cylinder barrel. The piston rod passes through both ends of the cylinder barrel. The two ends of the piston rod are respectively fixedly mounted on the right side of the bottom end of the sun-shaped top frame and the upper part of the inner wall of the mouth-shaped side frame. The cylinder barrel is sealingly and slidingly connected to the piston rod. The left and right ends of the cylinder barrel are respectively fixedly connected to the upper parts of the inner ends facing each other of the two mounting seats. A stop ring is provided at the right end of the piston rod.

[0012] Furthermore, the power-assisted winch is fixedly mounted on the lower portion of the outer end of the mounting seat on the right side.

[0013] Furthermore, the support leg assembly includes a support plate, an internal threaded sleeve, an external threaded sleeve, a top foot and a sole. The support plate is fixedly installed on the bottom end of the column, the top of the internal threaded sleeve is fixedly installed on the bottom end of the support plate, the external threaded sleeve is threadedly connected to the internal threaded sleeve, the bottom end of the external threaded sleeve is fixedly connected to the top foot, and the bottom end of the top foot is provided with a sole.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. When the prestressed pipe needs to be threaded with steel strands, first lift the entire winch body to an appropriate height through the liftable construction platform, place the mouth-shaped side frame of the winch body flat on the top surface of the construction platform, and make the four leg assemblies flat. Then fix one end of the wire rope to one end of the entire bundle of steel strands, adjust the four leg assemblies so that the four soles fall on the buttresses at the mouth of the prestressed pipe, and then tighten the wire rope to separate the entire winch body from the support of the construction platform. Then use the hydraulic motor to drive the drum to retract and release the wire rope, and at the same time adjust the rope arrangement cylinder to drive the winch assembly and the winch leg assembly to reciprocate up and down in the two double tracks on the inside of the frame, so that the wire ropes are neatly arranged and retracted on the drum. The rope presser presses the collected wire rope or the unreleased wire rope when the drum retracts and releases the wire rope to prevent the wire rope on the drum from sliding down due to its own weight.

[0016] 2. The entire device can pull in a whole bundle of steel strands at one time. At the same time, the entire device does not need to be fixed, which ensures safety and greatly improves work efficiency. The steel strands can be pulled in at different heights, which is convenient for adjustment and has no impact on the construction platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural view of the present invention;

[0018] Figure 2 is an exploded view of the present invention;

[0019] Figure 3 This is a structural view of the winch assembly of the present invention;

[0020] Figure 4 This is a structural view of the winch leg assembly of the present invention;

[0021] The reference numerals in the drawings are as follows: 1, framework; 2, multi-way valve; 3, upright column; 4, pilot valve; 5, winch assembly; 5-1, mounting seat; 5-2, drum; 5-3, rope pressing device; 5-4, motor oil port flange; 5-5, drum end cover; 5-6, round rod; 6, winch leg assembly; 6-1, support; 6-2, first copper bushing; 6-3, small wheel; 6-4, cover plate; 6-5, pin shaft; 6-6, pressing plate; 6-7, roller support; 6-8, end cover; 6-9, second copper bushing; 6-10, large wheel; 6-11, third copper bushing; 7, rope arranging oil cylinder; 8, stop ring; 9, assisting winch; 10, leg assembly; 10-1, support plate; 10-2, external thread sleeve; 10-3, internal thread sleeve; 10-4, top foot; 10-5, sole; 11, cross beam; 12, support beam. Detailed implementation manners

[0022] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0023] Refer to Figures 1 to 4 As shown, a reciprocating double-rail vertical hydraulic winch includes: a winch body for winding a steel wire rope fixedly connected to one end of a whole bundle of steel strands, and pulling the whole bundle of steel strands into a prestressed pipeline by winding the steel wire rope. The winch body is placed on a liftable construction platform. When winding the steel wire rope, the winch body floats on a buttress column at the prestressed pipeline opening, and the winch body is driven by the reverse acting force of the steel wire rope to disengage from the support of the construction platform.

[0024] The winch body includes a framework 1, upright columns 3, a winch assembly 5, a winch leg assembly 6, a rope arranging mechanism, an assisting winch 9, and a leg assembly 10. The framework 1 includes a day-shaped top frame and a mouth-shaped side frame. The mouth-shaped side frame is fixedly connected to the left bottom end of the day-shaped top frame. There are four upright columns 3, and the four upright columns 3 are symmetrically and fixedly installed on the front and rear sides of the bottom end of the day-shaped top frame. There are four groups of winch leg assemblies 6, and the four groups of winch leg assemblies 6 are symmetrically and slidably connected to two double tracks symmetrically arranged on the inner ends of the front and rear sides of the day-shaped top frame. The bottom ends of the four winch leg assemblies are respectively fixedly connected to the left sides of the top ends of the winch assembly. The rope arranging mechanism is used to drive the winch assembly 5 to reciprocate left and right. The assisting winch 9 is fixedly installed at the lower right end of the winch assembly 5. The bottom end of the upright column 3 is provided with a leg assembly 10 with adjustable length.

[0025] It further includes a multi-way valve 2 and a pilot valve 4. The multi-way valve 2, the pilot valve 4 and the corresponding balance valve are respectively installed at the bottom end of the day-shaped top frame. The flow direction of the hydraulic oil in the hydraulic motor can be adjusted through the multi-way valve provided. The pilot valve 4 provided facilitates the control of the valve body of the whole device. The balance valve provided can well balance the pressure of the hydraulic oil. The above valve body is connected to the winch motor and the rope arranging oil cylinder 7 through hydraulic hoses and joint bodies, etc., to drive the whole device to work as required.

[0026] It also includes a crossbeam 11 and a support beam 12. Two crossbeams 11 are provided. The two columns 3 on the same side in the front and rear are fixed together by a crossbeam 11 to improve the stability of the two columns 3. The two ends of the support beams 12 are symmetrically fixed on the lower outer ends of the two columns 3 on the front and rear sides of the left end, and the other ends of the two support beams 12 are symmetrically fixed on the front and rear sides of the lower right end of the mouth-shaped side frame. Through the two support beams 12, the gravity of the entire device can be evenly applied to the mouth-shaped side frame.

[0027] The winch assembly 5 includes a mounting seat 5-1, a drum 5-2, a rope press 5-3, a motor oil port flange 5-4, a drum end cover 5-5 and a round rod 5-6. Two mounting seats 5-1 are symmetrically arranged on the left and right. The drum 5-2 is arranged between the two mounting seats 5-1. There are two drum end covers 5-5. The two drum end covers 5-5 are symmetrically arranged at both ends of the drum 5-2. The outer ends of the two drum end covers 5-5 are respectively sealed and rotatably connected to the two motor oil port flanges 5-4. The two motor oil port flanges 5-4 are respectively fixed by a plurality of circular arrays. The bolts are fixedly installed on the inner ends of the two mounting seats 5-1 facing each other, and four round rods 5-6 are provided. The four round rods 5-6 are respectively arranged at the upper and lower front and rear positions between the two mounting seats 5-1. The rope presser 5-3 is installed on one of the round rods 5-1, and the two motor oil port flanges 5-4 are respectively connected to the input and output ends of the hydraulic motor. The hydraulic motor drives the drum 5-2 to retract and release. The rope presser 5-3 can press the wire rope that has been collected or the wire rope that has not been released to prevent the wire rope on the drum 5-2 from sliding down due to its own weight.

[0028] The winch leg assembly 6 includes a support 6-1, a copper sleeve 1 6-2, a small wheel 6-3, a cover plate 6-4, a pin 6-5, a pressure plate 6-6, a roller bracket 6-7, an end cover 6-8, a copper sleeve 2 6-9, a large wheel 6-10 and a copper sleeve 3 6-11. The outer side of the support 6-1 is rotatably connected to the middle of the roller bracket 6-7 through the copper sleeve 3 6-11, and the end cover 6-8 is fixedly installed on the outer end of the support 6-1; the large wheel 6-10 is rotatably connected to the middle of the pin 6-5 through two copper sleeves 2 6-9 arranged symmetrically in front and back, and the pin 6-5 is pinned to the left and right sides of the roller bracket 6-7. The upper left and right sides of the roller bracket 6-7 near one end of the support 6-1 are respectively fixedly installed Two pressure plates 6-6, the pressure plates 6-6 press the end surface of the contact pin 6-5 close to the support 6-1 on one side toward the roller bracket 6-7; the small wheel 6-3 is rotatably connected to the fixed shaft set at the top of the support 6-1 close to the roller bracket 6-7 through a copper sleeve 6-2, and a cover plate 6-4 is fixedly installed on the top of the fixed shaft; the large wheel 6-10 and the small wheel 6-3 are respectively connected to the double tracks in a transverse rolling manner, and the support 6-1 is fixedly installed on one side of the top of the mounting seat 5-1. The large wheel 6-10 and the small wheel 6-3 on the four winch leg assemblies 6 are respectively connected to the two double tracks on the inner side of the skeleton 1 in a rolling manner, so that the winch assembly can slide left and right on the skeleton.

[0029] The rope-laying mechanism includes a rope-laying cylinder 7. There are two rope-laying cylinders 7. The two rope-laying cylinders 7 are symmetrically placed horizontally on the front and rear sides of the bottom end of the skeleton 1. The rope-laying cylinder 7 includes a piston rod and a cylinder. The piston rod passes through both ends of the cylinder. The two ends of the piston rod are respectively fixedly mounted on the right side of the bottom end of the sun-shaped top frame and the upper part of the inner wall of the mouth-shaped side frame. The cylinder is sealed and slidably connected to the piston rod. The left and right ends of the cylinder are respectively fixedly connected to the upper parts of the inner ends facing each other of the two mounting seats 5-1. The cylinder moves left and right on the piston rod and drives the reel 5-2 to move left and right, so that the wire rope can be neatly arranged and wound on the reel. A stop ring 8 is provided at the right end of the piston rod. The stop ring 8 provided can limit the height of the upward movement of the winch assembly 5.

[0030] The power-assisted winch 9 is fixedly mounted on the lower portion of the outer end of the mounting seat 5-1 on the right side.

[0031] The leg assembly 10 includes a support plate 10-1, an internal threaded sleeve 10-2, an external threaded sleeve 10-3, a top foot 10-4 and a foot 10-5. The support plate 10-1 is fixedly mounted on the bottom end of the column 3, the top of the internal threaded sleeve 10-2 is fixedly mounted on the bottom end of the support plate 10-1, the external threaded sleeve 10-3 is threadedly connected to the internal threaded sleeve 10-2, the bottom end of the external threaded sleeve 10-3 is fixedly connected to the top foot 10-4, and the bottom end of the top foot 10-4 is provided with a foot 10-5. The telescopic length of the entire leg assembly 10 can be adjusted by rotating the external threaded sleeve 10-3.

[0032] When using the device, the construction platform is used to lift the winch body to the position of the prestressed pipe mouth, the four feet 10-5 fall on the buttress column, the internal threaded sleeve 10-2 and the external threaded sleeve 10-3 are adjusted to level the winch body, and then one end of the wire rope is fixedly connected to the pulling-in end of the entire bundle of steel strands, and then the hydraulic motor is used to drive the drum 5-2 to tighten the wire rope so that the entire winch is separated from the support of the construction platform, and the hydraulic motor is started to drive the drum 5-2 to rewind the wire rope. At the same time, according to the stacking situation of the wire rope on the drum 5-2, the rope arrangement cylinder 7 is adjusted to extend and retract, driving the winch assembly 5 and the winch support leg assembly 6 to move back and forth up and down on the two double tracks in the skeleton 1, helping the entire device to neatly arrange the retracted and released wire rope when working. When the wire rope is stacked on the drum 5-2, the rope presser 5-3 presses the wire rope to prevent the wire rope from sliding down due to its own weight. The drum 5-2 reels and releases the wire rope, and the winch leg assembly 6 moves up and down reciprocatingly to complete the rope reeling and releasing operations; the present invention solves the problems of low efficiency and construction difficulty in prestressed bundle threading construction of nuclear power and liquefied natural gas tanks, and can pull the entire bundle of steel strands into the prestressed pipe at one time, ensuring safety while greatly improving work efficiency. At the same time, the steel bundle can be pulled in at different heights, which is convenient for adjustment and has no impact on the construction platform.

[0033] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modification, equivalent replacement and improvement made by any technician familiar with the profession to the above embodiment without departing from the scope of the technical solution of the present invention and based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A reciprocating double-guide rail vertical hydraulic winch, characterized in that: include: A hoist body, the hoist body being used to wind up a steel wire rope fixedly connected to one end of the entire bundle of steel strands, and to pull the entire bundle of steel strands into the prestressed pipe by winding up the steel wire rope. The hoist body is placed on a liftable construction platform. When winding up the steel wire rope, the hoist body floats on the buttress column at the outlet of the prestressed pipe, and the hoist body is driven away from the support of the construction platform by the reverse force of the steel wire rope. The winch body comprises a frame (1), a column (3), a winch assembly (5), a winch leg assembly (6), a rope arrangement mechanism, a power winch (9), and a leg assembly (10). The frame (1) comprises a sun-shaped top frame and a mouth-shaped side frame, the mouth-shaped side frame being fixedly connected to the left side of the bottom end of the sun-shaped top frame. The columns (3) are provided in four groups, and the four columns (3) are symmetrically fixedly installed on the front and rear sides of the bottom end of the sun-shaped top frame. The winch leg assembly (6) is provided in four groups, and the four groups of winch leg assemblies (6) are symmetrically slidably connected to two double tracks symmetrically arranged on the front and rear sides of the inner end of the sun-shaped top frame. The bottom ends of the four winch leg assemblies are respectively fixedly connected to the left sides of the top end of the winch assembly. The rope arrangement mechanism is used to drive the winch assembly (5) to move back and forth. The power winch (9) is fixedly installed on the lower right end of the winch assembly (5). The bottom end of the column (3) is provided with a length-adjustable leg assembly (10).

2. A reciprocating double-guide rail vertical hydraulic winch according to claim 1, characterized in that: It also includes a multi-way valve (2) and a pilot valve (4), wherein the multi-way valve (2), the pilot valve (4) and the corresponding balancing valve are respectively installed at the bottom end of the sun-shaped top frame.

3. The reciprocating double-guide rail vertical hydraulic winch according to claim 1, characterized in that: It also includes a crossbeam (11) and a support beam (12), wherein two crossbeams (11) are provided, and two columns (3) on the same side of the front and rear are fixed together through a crossbeam (11), and two ends of the support beams (12) are symmetrically fixedly installed on the lower outer ends of the two columns (3) on the front and rear sides of the left end, and the other ends of the two support beams (12) are symmetrically fixedly installed on the front and rear sides of the lower right end of the slot-shaped side frame.

4. The reciprocating double-guide rail vertical hydraulic winch according to claim 1, characterized in that: The winch assembly (5) includes a mounting seat (5-1), a drum (5-2), a rope press (5-3), a motor oil port flange (5-4), a drum end cover (5-5) and a round rod (5-6). Two mounting seats (5-1) are symmetrically arranged on the left and right. The drum (5-2) is arranged between the two mounting seats (5-1). Two drum end covers (5-5) are provided. The two drum end covers (5-5) are symmetrically arranged at both ends of the drum (5-2). The two drum end covers ( The outer ends of 5-5 are respectively connected to the two motor oil port flanges (5-4) in a sealed rotation manner. The two motor oil port flanges (5-4) are respectively fixedly mounted on the inner ends of the two mounting seats (5-1) facing each other through a plurality of fixing bolts distributed in a circumferential array. Four round rods (5-6) are provided. The four round rods (5-6) are respectively arranged at the upper and lower sides and the front and rear positions between the two mounting seats (5-1). The rope presser (5-3) is installed on one of the round rods (5-6).

5. The reciprocating double-guide rail vertical hydraulic winch according to claim 1, characterized in that: The winch leg assembly (6) comprises a support (6-1), a copper sleeve 1 (6-2), a small wheel (6-3), a cover plate (6-4), a pin shaft (6-5), a pressure plate (6-6), a roller bracket (6-7), an end cover (6-8), a copper sleeve 2 (6-9), a large wheel (6-10) and a copper sleeve 3 (6-11). The outer side of the support (6-1) is rotatably connected to the middle part of the roller bracket (6-7) through the copper sleeve 3 (6-11), and the end cover (6-8) is fixedly installed on the outer end of the support (6-1); the large wheel (6-10) is rotatably connected to the middle part of the pin shaft (6-5) through two copper sleeves 2 (6-9) arranged symmetrically in front and back. The pin shaft (6-5) is pinned to the roller bracket (6 -7), two pressing plates (6-6) are fixedly installed on the left and right sides of the upper part of the roller bracket (6-7) close to one end of the support (6-1), respectively, and the pressing plates (6-6) press the end surface of the contact pin shaft (6-5) close to the support (6-1) toward one side of the roller bracket (6-7); the small wheel (6-3) is rotatably connected to the fixed shaft set at the top end of the support (6-1) close to the roller bracket (6-7) through a copper sleeve (6-2), and a cover plate (6-4) is fixedly installed on the top of the fixed shaft; the large wheel (6-10) and the small wheel (6-3) are respectively connected to the double tracks in a transverse rolling manner, and the support (6-1) is fixedly installed on one side of the top end of the mounting base (5-1).

6. The reciprocating double-guide rail vertical hydraulic winch according to claim 1, characterized in that: The rope-laying mechanism includes a rope-laying oil cylinder (7), and two rope-laying oil cylinders (7) are provided. The two rope-laying oil cylinders (7) are symmetrically placed horizontally on the front and rear sides of the bottom end of the frame (1). The rope-laying oil cylinder (7) includes a piston rod and a cylinder barrel. The piston rod passes through both ends of the cylinder barrel. The two ends of the piston rod are respectively fixedly mounted on the right side of the bottom end of the sun-shaped top frame and the upper part of the inner wall of the mouth-shaped side frame. The cylinder barrel is sealingly slidably connected to the piston rod. The left and right ends of the cylinder barrel are respectively fixedly connected to the upper parts of the inner ends facing each other of the two mounting seats (5-1). A stop ring (8) is provided on the right end of the piston rod.

7. The reciprocating double-guide rail vertical hydraulic winch according to claim 1, characterized in that: The power-assisted winch (9) is fixedly mounted on the lower portion of the outer end of the mounting seat (5-1) on the right side.

8. The reciprocating double-guide rail vertical hydraulic winch according to claim 1, characterized in that: The support leg assembly (10) comprises a support plate (10-1), an internally threaded sleeve (10-2), an externally threaded sleeve (10-3), a top foot (10-4) and a sole (10-5); the support plate (10-1) is fixedly mounted on the bottom end of the column (3); the top of the internally threaded sleeve (10-2) is fixedly mounted on the bottom end of the support plate (10-1); the externally threaded sleeve (10-3) is threadedly connected to the internally threaded sleeve (10-2); the bottom end of the externally threaded sleeve (10-3) is fixedly connected to the top foot (10-4); and the bottom end of the top foot (10-4) is provided with a sole (10-5).

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