A marine crane stabilizing assembly

Abstract

The application relates to the field of crane technology and particularly relates to a ship crane stabilizing assembly, which comprises a base, the top of the base is provided with a vertical rod, a swing rod, the end of the swing rod is provided with a telescopic rod, the end of the telescopic rod is provided with a top-holding rod, the surface of the swing rod is provided with a first slot, the surface of the swing rod is provided with a limiting plate, the limiting plate is provided with a sliding block, the end of the sliding block is provided with a first L-shaped rod, a second L-shaped rod is arranged at the bottom of the telescopic rod, and the beneficial effects are that when a sleeving ring is located at the top of a lifting block, a forklift can be inserted into a first through groove and a second through groove, after the forklift is inserted into the second through groove, a top-holding block is pushed to top-hold at the bottom of the sleeving ring, the position of the lifting block is stabilized, the crane can be moved through the forklift through the second through groove and the first through groove, the first through groove can be shielded after the sleeving ring moves downwards, and the force plate on the surface of the sleeving ring is top-held at the end of the lifting block, so that the lifting block is retracted into the telescopic hole.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cranes, in particular to a ship crane stabilizing assembly. BACKGROUND

[0002] A crane refers to a multi-motion hoisting machine for vertically lifting and horizontally transporting heavy objects within a certain range, also known as a hoist. Some hoisting equipment has the characteristic of doing intermittent motion, i.e., in a working cycle, the corresponding mechanisms for taking, transporting, and unloading are alternately operated.

[0003] In the prior art, the patent CN208561507U includes a machine body, the bottom of the machine body is fixedly connected with a base, the bottom of the base is fixedly connected with legs at four corners, the bottom of the leg is movably connected with a roller through a rotating shaft, and the two sides of the inner cavity of the base are movably connected with moving plates. The side away from the inner cavity of the base of the moving plate penetrates to the outside of the base, and the opposite side of the moving plate is provided with a threaded hole. The base, the moving plate, the threaded hole, the double-shaft motor, the rotating rod, the first bevel gear, the threaded rod, the second bevel gear, the first sleeve plate, the first sliding groove, the sliding rod, the first hydraulic rod, the support plate, the long groove, the second hydraulic rod, the connecting rod, and the movable plate are cooperated to adjust the distance between the support plates, increase the supporting area of the crane base, make the center of gravity of the base more stable, improve the stability of the base, and facilitate the safe operation of the operator.

[0004] However, when the crane is disassembled, the crane is directly placed on the surface of the ship, which requires the crane to be lifted for transportation, resulting in low transportation efficiency and consumption of a large amount of resources and equipment. SUMMARY

[0005] The present application aims to provide a ship crane stabilizing assembly to solve the problems raised in the background.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a ship crane stabilizing assembly, comprising:

[0007] A base is provided with a vertical rod on the top.

[0008] A swing rod is provided with an extension rod at one end, and a top holding rod is provided at the end of the extension rod. A first slot is formed on the surface of the swing rod, and a limiting plate is arranged on the surface of the swing rod. A sliding block is arranged in the limiting plate, and a first L-shaped rod is arranged at the end of the sliding block.

[0009] A second L-shaped rod is arranged at the bottom of the extension rod.

[0010] Preferably, the top of the stand is provided with a rotating block, the top of the rotating block is provided with a lifting arm, the bottom of the lifting arm is provided with a hydraulic rod, the surface of the rotating block is fixedly provided with a first extension plate, the bottom of the hydraulic rod is connected with the first extension plate, the outside of the stand is sleeved with a sleeving ring, the sleeving ring can ascend and descend on the surface of the stand, the surface of the stand is provided with a first through groove, and the bottom of the stand is provided with a plurality of clamping grooves.

[0011] Preferably, the surface of the sleeving ring is fixedly provided with a plurality of stress plates, the stress plates ascend and descend with the sleeving ring, the bottom of the sleeving ring is fixedly provided with an arc-shaped rod, the end of the arc-shaped rod is fixedly provided with a top holding plate, the top holding plate and the arc-shaped rod ascend and descend with the sleeving ring, the bottom of the sleeving ring is fixedly provided with a pressing plate, the bottom of the pressing plate is provided with a stress groove, and the pressing plate ascends and descends with the sleeving ring.

[0012] Preferably, the bottom of the rotating block is screwed with a screw rod, the surface of the screw rod is fixedly provided with a limiting ring, the limiting ring is provided with two groups, the surface of the sleeving ring is fixedly provided with a second extension plate, and the limiting rings are respectively located at the top and bottom of the second extension plate.

[0013] Preferably, the swing rod is hinged to the surface of the stand through a rotating shaft, the swing rod can swing along the rotating shaft, the end of the swing rod is inserted with a telescopic rod, the telescopic rod can telescopically move in the swing rod, and the top holding rod moves with the telescopic rod.

[0014] Preferably, the surface of the telescopic rod is inserted with a first L-shaped rod, the first L-shaped rod can telescopically move in the telescopic rod, the end of the first L-shaped rod is connected with a second L-shaped rod, the second L-shaped rod moves with the first L-shaped rod, the limiting plates are provided with two groups, a sliding block is arranged between the limiting plates, the sliding block can move between the limiting plates, the surface of the sliding block is provided with teeth, and the teeth are provided with a plurality of groups.

[0015] Preferably, the surface of the telescopic rod is fixedly provided with a plurality of limiting strips, the limiting strips are inserted in the swing rod, the limiting strips move with the telescopic rod, the surface of the swing rod is provided with a first slot and a second slot, the first L-shaped rod can move in the first slot, and the second L-shaped rod can move in the second slot.

[0016] Preferably, the bottom of the swing rod is fixedly provided with an L-shaped plate, the end of the second L-shaped rod is fixedly provided with a pressing block, the pressing block is located between the two groups of L-shaped plates, the pressing block moves with the second L-shaped rod, the pressing block is supported on the surface of the L-shaped plate after moving, the surface of the L-shaped plate near the pressing block is provided with teeth, the surface of the pressing block near the L-shaped plate is provided with teeth, and the teeth on the surface of the pressing block are engaged with the teeth on the surface of the L-shaped plate after the pressing block is supported on the surface of the L-shaped plate.

[0017] Preferably, the surface of the stand is provided with a telescopic hole, a lifting block is inserted into the telescopic hole, the lifting block can move in the telescopic hole, the surface of the lifting block is provided with a second groove, the surface of the lifting block is provided with a supporting block, one end of the supporting block is located in the second groove, and the supporting block can move in the surface of the lifting block and be supported at the bottom of the sleeving ring after moving.

[0018] Preferably, the surface of the stand is provided with a telescopic hole, a lifting block is inserted into the telescopic hole, the lifting block can move in the telescopic hole, the surface of the lifting block is provided with a second groove, the surface of the lifting block is provided with a supporting block, one end of the supporting block is located in the second groove, and the supporting block can move in the surface of the lifting block and be supported at the bottom of the sleeving ring after moving.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] When the sleeving ring is located at the top of the lifting block, the forklift can be inserted into the first groove and the second groove, the supporting block is supported at the bottom of the sleeving ring after being inserted into the second groove, the position of the lifting block is stabilized, the crane can be moved through the forklift through the second groove and the first groove, the first groove is blocked after the sleeving ring moves down, and the force plate on the surface of the sleeving ring is supported at the end of the lifting block, so that the lifting block is retracted into the telescopic hole. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a three-dimensional structure schematic diagram of the present application.

[0022] Figure 2 It is another perspective structure schematic diagram of the present application.

[0023] Figure 3 It is a stand structure schematic diagram of the present application.

[0024] Figure 4 It is a sleeving ring structure schematic diagram of the present application.

[0025] Figure 5 It is a swing rod structure schematic diagram of the present application.

[0026] Figure 6 It is another perspective structure schematic diagram of the present application.

[0027] Figure 7 For Figure 3 Structure enlarged schematic view at A in the middle.

[0028] Figure 8 For Figure 4 Structure enlarged schematic view at B in the middle.

[0029] Figure 9 For Figure 5 Structure enlarged schematic view at C in the middle.

[0030] Figure 10 For Figure 6 Structure enlarged schematic view at D in the middle.

[0031] In the figure: hoisting arm 1, hydraulic rod 2, first extension plate 3, rotating block 4, vertical rod 5, base 6, first through slot 7, sleeving ring 8, clamping groove 9, top holding plate 10, arc-shaped rod 11, stress plate 12, top holding rod 13, telescopic rod 14, limiting plate 15, first slot 16, swing rod 17, rotating shaft 18, second extension plate 19, screw rod 20, limiting ring 21, stress groove 23, pressing plate 24, teeth 25, first L-shaped rod 26, limiting strip 28, second slot 29, second L-shaped rod 30, pressing block 31, L-shaped plate 32, sliding block 33, top holding block 34, telescopic hole 35, second through slot 36, hoisting block 37. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions of the present application clear, complete and the advantages more clear and obvious, the following will be further described in detail in combination with the drawings. It should be understood that the specific embodiments described here are part of the embodiments of the present application, not all embodiments, and are only used to explain the embodiments of the present application, and are not used to limit the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0033] Please refer to Figures 1 to 10 The present application provides a technical solution:

[0034] Embodiment 1: a ship crane stabilizing assembly, comprising: a base 6, the top of the base 6 is provided with a vertical rod 5; a swing rod 17, the end of the swing rod 17 is provided with a telescopic rod 14, the end of the telescopic rod 14 is provided with a top holding rod 13, the surface of the swing rod 17 is provided with a first slot 16, the surface of the swing rod 17 is provided with a limiting plate 15, the limiting plate 15 is provided with a sliding block 33, the end of the sliding block 33 is provided with a first L-shaped rod 26; a second L-shaped rod 30 is arranged at the bottom of the telescopic rod 14, the second L-shaped rod 30 drives the downward pressing block 31 to be held on the surface of the L-shaped plate 32, the surface of the L-shaped plate 32 and the surface of the downward pressing block 31 are provided with teeth, so as to keep the stability of the downward pressing block 31 and further keep the stability of the telescopic rod 14.

[0035] The embodiment 2 is based on the embodiment 1, the top of the vertical rod 5 is provided with the rotating block 4, the top of the rotating block 4 is provided with the lifting arm 1, the bottom of the lifting arm 1 is provided with the hydraulic rod 2, the surface of the rotating block 4 is fixedly provided with the first extension plate 3, the bottom of the hydraulic rod 2 is connected with the first extension plate 3, the outside of the vertical rod 5 is sleeved with the sleeving ring 8, the sleeving ring 8 can be lifted on the surface of the vertical rod 5, the surface of the vertical rod 5 is provided with the first through slot 7, the bottom of the vertical rod 5 is provided with a plurality of clamping grooves 9, the swinging rod 17 is hingedly connected to the surface of the vertical rod 5 through the rotating shaft 18, the swinging rod 17 can swing along the rotating shaft 18, the end of the swinging rod 17 is inserted with the telescopic rod 14, the telescopic rod 14 can telescopically move in the swinging rod 17, the top holding rod 13 moves along with the telescopic rod 14, the surface of the telescopic rod 14 is inserted with the first L-shaped rod 26, the first L-shaped rod 26 can telescopically move in the telescopic rod 14, the end of the first L-shaped rod 26 is connected with the second L-shaped rod 30, the second L-shaped rod 30 moves along with the first L-shaped rod 26, the limiting plate 15 is provided with two groups, the sliding block 33 is arranged between the limiting plates 15, the sliding block 33 can move between the limiting plates 15, the surface of the sliding block 33 is provided with the teeth 25, the teeth 25 are provided with a plurality of groups, the surface of the telescopic rod 14 is fixedly provided with a plurality of limiting strips 28, the limiting strips 28 are inserted in the swinging rod 17, the limiting strips 28 move along with the telescopic rod 14, the surface of the swinging rod 17 is provided with the first slot 16 and the second slot 29, the first L-shaped rod 26 can move in the first slot 16, the second L-shaped rod 30 can move in the second slot 29, the bottom of the swinging rod 17 is fixedly provided with the L-shaped plate 32, the end of the second L-shaped rod 30 is fixedly provided with the pressing block 31, the pressing block 31 is located between the two L-shaped plates 32, the pressing block 31 moves along with the second L-shaped rod 30, the pressing block 31 is held on the surface of the L-shaped plate 32 after moving, the surface of the L-shaped plate 32 close to the pressing block 31 is provided with the teeth, the surface of the pressing block 31 close to the L-shaped plate 32 is provided with the teeth, the teeth on the surface of the pressing block 31 are engaged with the teeth on the surface of the L-shaped plate 32 after the pressing block 31 is held on the surface of the L-shaped plate 32, the surface of the vertical rod 5 is provided with the telescopic hole 35, the telescopic hole 35 is inserted with the lifting block 37, the lifting block 37 can telescopically move in the telescopic hole 35, the surface of the lifting block 37 is provided with the second through slot 36, the surface of the lifting block 37 is inserted with the holding block 34, one end of the holding block 34 is located in the second through slot 36, and the holding block 34 can telescopically move on the surface of the lifting block 37, the holding block 34 can be held on the bottom of the sleeving ring 8 after moving, when the sleeving ring 8 is located on the top of the lifting block 37, the forklift can be inserted into the first through slot 7 and the second through slot 36, after the forklift is inserted into the second through slot 36, the holding block 34 is held on the bottom of the sleeving ring 8 after receiving the pushing, the position of the lifting block 37 is stabilized, the crane can be moved through the forklift through the second through slot 36 and the first through slot 7, the sleeving ring 8 drives the arc-shaped rod 11 and the pressing plate 24 to move downwards,The top holding plate 10 at the end of the arc-shaped rod 11 is held on the surface of the sliding block 33, the bottom of the top holding plate 10 is provided with a tooth, the surface of the sliding block 33 is provided with a tooth 25, the tooth on the surface of the top holding plate 10 is engaged with the tooth 25 on the surface of the sliding block 33, and the position of the sliding block 33 is kept stable.

[0036] A plurality of force receiving plates 12 are fixed on the surface of the sleeve ring 8, the force receiving plates 12 are raised and lowered with the sleeve ring 8, the bottom of the sleeve ring 8 is fixed with the arc-shaped rod 11, the end of the arc-shaped rod 11 is fixed with the top holding plate 10, the top holding plate 10 and the arc-shaped rod 11 are raised and lowered with the sleeve ring 8, the bottom of the sleeve ring 8 is fixed with the lower pressing plate 24, the bottom of the lower pressing plate 24 is provided with a force receiving groove 23, the lower pressing plate 24 is raised and lowered with the sleeve ring 8, the lower pressing plate 24 is held on the surface of the swing rod 17 after the sleeve ring 8 is lowered, the force receiving groove 23 on the surface of the lower pressing plate 24 is clamped on the surface of the swing rod 17, the force receiving plate 12 is held on the surface of the lifting block 37 after the sleeve ring 8 is lowered, so that the lifting block 37 is retracted into the telescopic hole 35, when the lower pressing plate 24 is held on the surface of the swing rod 17, the top holding rod 13 at the end of the telescopic rod 14 is held on the surface of the ship, and the telescopic rod 14 is stable in the inside of the swing rod 17, when the vertical rod 5 swings, the telescopic rod 14 and the swing rod 17 play a role in sharing the force, the force receiving plate 12 is held on the end of the lifting block 37, the end of the lifting block 37 is arc-shaped, so that the arc-shaped end of the lifting block 37 bears the force, the lifting block 37 is retracted into the inside of the telescopic hole 35, during the lowering of the sleeve ring 8, the edge of the sleeve ring 8 is held on the arc-shaped end of the lifting block 37, so that the lifting block 37 is further retracted into the inside of the telescopic hole 35, and the sleeve ring 8 continues to descend, the surface of the sleeve ring 8 is held on the end of the lifting block 37, so that the lifting block 37 is completely retracted into the inside of the telescopic hole 35.

[0037] The bottom of the rotating block 4 is screwed with a screw rod 20, the surface of the screw rod 20 is fixed with a limiting ring 21, the limiting ring 21 is provided with two groups, the surface of the sleeve ring 8 is fixed with a second extension plate 19, and the limiting ring 21 is located at the top and bottom of the second extension plate 19 respectively.

[0038] The base 6 is fixed on the surface of the ship by the screw rod, the hydraulic rod 2 drives the lifting arm 1 to swing, the rotating block 4 can rotate on the top of the base 6, when the crane is used, the telescopic rod 14 is extended from the swing rod 17, the top holding rod 13 at the end of the telescopic rod 14 is held on the surface of the ship, the screw rod 20 is screwed, the limiting ring 21 on the surface of the screw rod 20 pushes the second extension plate 19 to move, the second extension plate 19 drives the sleeving ring 8 to move downwards on the surface of the vertical rod 5, the sleeving ring 8 drives the arc-shaped rod 11 and the pressing plate 24 to move downwards, the top holding plate 10 at the end of the arc-shaped rod 11 is held on the surface of the sliding block 33, the teeth on the bottom of the top holding plate 10, the teeth 25 on the surface of the sliding block 33, the teeth on the surface of the top holding plate 10 and the teeth 25 on the surface of the sliding block 33 are engaged, the position of the sliding block 33 is stable, the sliding block 33 is connected with the telescopic rod 14 through the first L-shaped rod 26, the telescopic rod 14 is stable, and the first L-shaped rod 26 is connected with the second L-shaped rod 30, the first L-shaped rod 26 drives the second L-shaped rod 30 to move, the second L-shaped rod 30 drives the pressing block 31 to be held on the surface of the L-shaped plate 32, the surface of the L-shaped plate 32 and the surface of the pressing block 31 are provided with teeth, the position of the pressing block 31 is stable, the telescopic rod 14 is further stable, the swing rod 17 is hinged on the surface of the vertical rod 5 through the rotating shaft 18, the pressing plate 24 moves downwards and is held on the surface of the swing rod 17, the position of the swing rod 17 is stable, the swing rod 17 can share the stress of the vertical rod 5, when the sleeving ring 8 is located on the top of the lifting block 37, the forklift can be inserted into the first through slot 7 and the second through slot 36, after the forklift is inserted into the second through slot 36, the top holding block 34 is pushed and held on the bottom of the sleeving ring 8, the position of the lifting block 37 is stable, the crane can be moved through the forklift through the second through slot 36 and the first through slot 7, the first through slot 7 is blocked after the sleeving ring 8 moves downwards, and the stress plate 12 on the surface of the sleeving ring 8 is held on the end of the lifting block 37, so that the lifting block 37 is retracted into the telescopic hole 35.

[0039] Although the above describes the specific embodiments of the present application in order to enable those skilled in the art to understand the present application, the present application is not limited to the specific embodiments, and all the application creations using the concept of the present application are protected as long as various changes are within the spirit and scope of the present application defined and determined by the appended claims.

Claims

1. A vessel crane stabilisation assembly characterised in that: Comprising: A base (6), the top of the base (6) is provided with a vertical rod (5); A swing rod (17), the end of the swing rod (17) is provided with a telescopic rod (14), the end of the telescopic rod (14) is provided with a top holding rod (13), the surface of the swing rod (17) is provided with a first slot (16), the surface of the swing rod (17) is provided with a limiting plate (15), the end of the sliding block (33) is provided with a first L-shaped rod (26); The second L-shaped rod (30) is arranged at the bottom of the telescopic rod (14), the top of the vertical rod (5) is provided with a rotating block (4), the top of the rotating block (4) is provided with a lifting arm (1), the bottom of the lifting arm (1) is provided with a hydraulic rod (2), the surface of the rotating block (4) is fixedly provided with a first extension plate (3), the bottom of the hydraulic rod (2) is connected with the first extension plate (3), the outer portion of the vertical rod (5) is sleeved with a sleeving ring (8), the sleeving ring (8) can be lifted on the surface of the vertical rod (5), the surface of the vertical rod (5) is provided with a first through groove (7), the bottom of the vertical rod (5) is provided with a plurality of clamping grooves (9), the surface of the sleeving ring (8) is fixedly provided with a plurality of stress plates (12), the stress plates (12) are lifted along with the sleeving ring (8), the bottom of the sleeving ring (8) is fixedly provided with an arc-shaped rod (11), the end portion of the arc-shaped rod (11) is fixedly provided with a supporting plate (10), the supporting plate (10) and the arc-shaped rod (11) are lifted along with the sleeving ring (8), the bottom of the sleeving ring (8) is fixedly provided with a pressing plate (24), the bottom of the pressing plate (24) is provided with a stress groove (23), the pressing plate (24) is lifted along with the sleeving ring (8), the surface of the telescopic rod (14) is inserted with a first L-shaped rod (26), the first L-shaped rod (26) can be telescopically moved in the telescopic rod (14), the end portion of the first L-shaped rod (26) is connected with a second L-shaped rod (30), the second L-shaped rod (30) is moved along with the first L-shaped rod (26), the limiting plates (15) are provided with two groups, the sliding blocks (33) are arranged between the limiting plates (15), the sliding blocks (33) can be moved between the limiting plates (15), the surface of the sliding block (33) is provided with a plurality of teeth (25), the end portion of the swinging rod (17) is fixedly provided with an L-shaped plate (32), the end portion of the second L-shaped rod (30) is fixedly provided with a pressing block (31), the pressing block (31) is located between the two L-shaped plates (32), the pressing block (31) is moved along with the second L-shaped rod (30), the pressing block (31) is supported on the surface of the L-shaped plate (32) after being moved, the surface of the L-shaped plate (32) near the pressing block (31) is provided with a tooth, the surface of the pressing block (31) near the L-shaped plate (32) is provided with a tooth, the tooth on the surface of the pressing block (31) is engaged with the tooth on the surface of the L-shaped plate (32) after the pressing block (31) is supported on the surface of the L-shaped plate (32), the surface of the vertical rod (5) is provided with a telescopic hole (35), the telescopic hole (35) is inserted with a lifting block (37), the lifting block (37) can be telescopically moved in the telescopic hole (35), the surface of the lifting block (37) is provided with a second through groove (36), the surface of the lifting block (37) is inserted with a supporting block (34), one end of the supporting block (34) is located in the second through groove (36), and the supporting block (34) can be telescopically moved on the surface of the lifting block (37), the supporting block (34) can be supported on the bottom of the sleeving ring (8) after being moved.

2. A vessel crane stabilisation assembly according to claim 1, characterised in that: The bottom of the rotating block (4) is screwed with a screw rod (20), the surface of the screw rod (20) is fixed with a limiting ring (21), the limiting ring (21) is provided with two groups, the surface of the sleeve ring (8) is fixed with a second extension plate (19), and the limiting ring (21) is located at the top and bottom of the second extension plate (19) respectively.

3. A vessel crane stabilisation assembly according to claim 2, characterised in that: The swing rod (17) is hinged on the surface of the vertical rod (5) through a rotating shaft (18), the swing rod (17) can swing along the rotating shaft (18), the end of the swing rod (17) is inserted with the telescopic rod (14), the telescopic rod (14) can move telescopically in the swing rod (17), and the top holding rod (13) moves along with the telescopic rod (14).

4. A vessel crane stabilisation assembly according to claim 3, characterised in that: The surface of the telescopic rod (14) is fixed with a plurality of limiting strips (28), the limiting strips (28) are inserted into the swing rod (17), the limiting strips (28) move along with the telescopic rod (14), the surface of the swing rod (17) is provided with a first slot (16) and a second slot (29), the first L-shaped rod (26) can move in the first slot (16), and the second L-shaped rod (30) can move in the second slot (29).

5. A vessel crane stabilisation assembly according to claim 4, characterised in that: The surface of the telescopic rod (14) is fixed with a plurality of limiting strips (28), the limiting strips (28) are inserted into the swing rod (17), the limiting strips (28) move along with the telescopic rod (14), the surface of the swing rod (17) is provided with a first slot (16) and a second slot (29), the first L-shaped rod (26) can move in the first slot (16), and the second L-shaped rod (30) can move in the second slot (29). When the telescopic rod (14) is stably arranged in the swing rod (17), when the vertical rod (5) swings, the telescopic rod (14) and the swing rod (17) play a role in sharing the stress, the stress plate (12) is held at the end of the lifting block (37), the end of the lifting block (37) is arc-shaped, so that the arc-shaped end of the lifting block (37) is stressed, the lifting block (37) is withdrawn into the telescopic hole (35), during the descending process of the sleeve ring (8), the edge of the sleeve ring (8) is held at the arc-shaped end of the lifting block (37), so that the lifting block (37) is further withdrawn into the telescopic hole (35), and the sleeve ring (8) continues to descend, the surface of the sleeve ring (8) is held at the end of the lifting block (37), so that the lifting block (37) is completely withdrawn into the telescopic hole (35).

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