Inner hole internal expansion lifting appliance

Abstract

The utility model discloses an inner hole internal expansion lifting appliance which comprises a central shaft, a top connecting sleeve, a bottom connecting sleeve, a plurality of clamping blocks, a top connecting arm and a bottom connecting arm, wherein the top connecting sleeve and the bottom connecting sleeve are sleeved at the top and the bottom of the central shaft; one end of the top connecting arm is hinged with the top connecting sleeve, and the other end is hinged with the top inside the clamping block; one end of the bottom connecting arm is hinged with the bottom connecting sleeve, and the other end is hinged with the inner bottom of the clamping block; a supporting locking assembly is arranged above the top connecting sleeve, a first limiting check ring is arranged below the top connecting sleeve, and an unlocking spring is arranged between the bottom of the top connecting sleeve and the first limiting check ring. A second limiting check ring is arranged above the bottom connecting sleeve; the locking structure and the unlocking spring are arranged, so that the internal expansion structure is stable, and the hoisting safety is high; and labor is saved when the lifting appliance is separated from the workpiece.

Description

Technical Field

[0001] The utility model relates to the field of hoisting equipment, in particular to an inner hole and inner expansion hoist. Background Art

[0002] There are many tubular workpieces in mechanical processing, such as stators, elbows, etc. Some large or heavy tubular workpieces need to be hoisted when moved or installed, so suitable hoists are needed.

[0003] Chinese patent CN102745589A discloses an internal expansion self-locking sling. Under the action of gravity, each contact block of the patent tightly supports the hole wall of the hoisted object, and the object can be lifted by pulling the lifting ring with one hand. However, the patent also has certain defects. For example, there is no locking structure, which cannot ensure the stability of the internal expansion structure, and there are safety hazards during lifting.

[0004] Chinese patent CN108821105A discloses a stator hoist that utilizes friction between the outer wall of a tensioner and the stator hole wall to lift the stator. However, this solution requires rotating a lever and utilizing a screw-nut mechanism to control the tension of the hoist. This lacks operational flexibility and requires further structural improvement.

[0005] In addition, the inner walls of some tubular workpieces are relatively smooth. After coming into contact with the internal expansion hanger, the rubber pad has a large suction force on the inner wall, making separation more difficult. Utility Model Content

[0006] The purpose of the utility model is to provide an inner hole expansion sling.

[0007] The innovation of the utility model lies in that: the application is provided with a locking structure and an unlocking spring, the internal expansion structure is stable, and the lifting safety is high; and effort is saved when the lifting device is separated from the workpiece.

[0008] In order to achieve the above-mentioned utility model purpose, the technical solution of the utility model is:

[0009] The top end of the lifting link is hinged on the top of the lifting link, and the bottom end is hinged on the inner bottom of the lifting link, and the lifting link is hinged on the top of the lifting link.

[0010] Furthermore, a middle connecting sleeve is provided between the top connecting sleeve and the bottom connecting sleeve, and a middle connecting arm is provided between the top connecting arm and the bottom connecting arm. One end of the middle connecting arm is hinged to the middle connecting sleeve, and the other end is hinged to the middle part of the inner side of the block; a third limit ring is also provided at the bottom of the middle connecting sleeve.

[0011] Furthermore, a fixing seat is provided below the bottom connecting sleeve, and the bottom connecting sleeve is welded to the fixing seat.

[0012] Furthermore, a first limiting pin is provided between the bottom connecting sleeve and the central shaft.

[0013] Furthermore, a second limiting pin is provided between the middle connecting sleeve and the central shaft.

[0014] Furthermore, a rubber pad is provided on the outer side wall of the clamping block, and the rubber pad is connected to the clamping block by screws.

[0015] Furthermore, a handle is provided on the support seat, and a lifting lug is provided on the top end of the central axis.

[0016] The beneficial effects of the utility model are:

[0017] First: This application uses its own gravity to expand outward, contacts the inner wall of the tubular workpiece, generates friction, and forms an internal expansion structure. This application provides a locking nut. After the clamping block contacts the tubular workpiece, the locking nut is rotated to lock and fix the internal expansion structure, thereby ensuring the stability of the internal expansion structure and improving the safety of lifting.

[0018] Second: the application sets the unlocking spring, after hoisting, need to separate the lifting appliance and workpiece, rotate the locking nut, the unlocking spring lifts the top connecting sleeve and the support seat, can quickly, labor-saving separate the lifting appliance and workpiece.

[0019] Third: the application sets the first limit check ring, the second limit check ring and the third limit check ring, the middle connecting sleeve, the bottom connecting sleeve and the center shaft are further provided with the second limit pin and the first limit pin, can improve the stability of connecting sleeve and center shaft connection, further improve the safety of the lifting appliance. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the structural schematic diagram of the utility model.

[0021] Figure 2 It is the center shaft and the support locking assembly sectional view.

[0022] In the drawing: 10 is the center shaft, 11 is the top connecting sleeve, 12 is the bottom connecting sleeve, 13 is the middle connecting sleeve, 20 is the clamping block, 21 is the rubber pad, 22 is the screw, 31 is the top connecting arm, 32 is the bottom connecting arm, 33 is the middle connecting arm, 40 is the support locking assembly, 41 is the support seat, 42 is the sleeve, 43 is the locking nut, 44 is the handle, 51 is the first limit check ring, 52 is the second limit check ring, 53 is the third limit check ring, 54 is the unlocking spring, 60 is the fixed seat, 71 is the first limit pin, 72 is the second limit pin. DETAILED DESCRIPTION

[0023] The technical scheme in the utility model embodiment will be described clearly and completely in conjunction with the drawings.

[0024] The utility model provides an inner hole inner expansion lifting appliance, including center shaft 10, the top connecting sleeve 11 and bottom connecting sleeve 12 of setting in the top and bottom of center shaft 10, a plurality of clamping blocks 20 along the lateral circumference of center shaft 10 is evenly distributed, still including top connecting arm 31 and bottom connecting arm 32, top connecting arm 31 one end is hinged with top connecting sleeve 11, and the other end is hinged with the inside top of clamping block 20, bottom connecting arm 32 one end is hinged with bottom connecting sleeve 12, and the other end is hinged with the inside bottom of clamping block 20, the top of top connecting sleeve 11 is provided with support locking assembly 40 above, including support seat 41, sleeve 42 is set up on support seat 41 and is set up locking nut 43 above sleeve 42, top connecting sleeve 11 top and support seat 41 bottom welding connection are connected, center shaft 10 upper end passes through sleeve 42, top connecting sleeve 11 and center shaft 10 sliding connection, bottom connecting sleeve 12 and center shaft 10 fixed connection, the outer wall of center shaft 10 upper end is provided with external thread and locking nut 43 cooperation, top connecting sleeve 11 below is provided with first limit baffle 51, and between top connecting sleeve 11 bottom and first limit baffle 51 is provided with unlocking spring 54, bottom connecting sleeve 12 is provided with second limit baffle 52 above.

[0025] Further, the top connecting sleeve 11 and bottom connecting sleeve 12 are also provided with a middle connecting sleeve 13, the top connecting arm 31 and bottom connecting arm 32 are also provided with a middle connecting arm 33, one end of the middle connecting arm 33 is hinged with the middle connecting sleeve 13, and the other end is hinged with the middle inside of the clamping block 20, and the bottom of the middle connecting sleeve 13 is also provided with a third limit baffle 53.

[0026] Further, the bottom connecting sleeve 12 is also provided with a fixing seat 60 below, and the bottom connecting sleeve 12 is welded with the fixing seat 60.

[0027] Further, the bottom connecting sleeve 12 and the center shaft 10 are also provided with a first limit pin 71.

[0028] Further, the middle connecting sleeve 13 and the center shaft 10 are also provided with a second limit pin 72.

[0029] Further, the outer wall of the clamping block 20 is provided with a rubber pad 21, and the rubber pad 21 and the clamping block 20 are connected by a screw 22.

[0030] Further, the support seat 41 is also provided with a handle 44, and the top end of the center shaft 10 is provided with a lifting lug (not marked in the figure).

[0031] The application utilizes self-gravity to expand outward, the clamping block 20 is in contact with the inner wall of the tubular workpiece, friction is generated, an internal expansion structure is formed, after the clamping block 20 is in contact with the tubular workpiece, the internal expansion structure is locked and fixed through the rotating locking nut 43, the stability of the internal expansion structure is ensured, and the safety of hoisting is improved.

[0032] After hoisting is completed, the locking nut 43 is reversely rotated, the unlocking spring 54 lifts up the top connecting sleeve 11 and the support seat 41, the lifting tool can be separated from the workpiece quickly and labor-savingly.

[0033] The described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

Claims

1. An inner hole expansion sling, comprising a central shaft (10), a top connecting sleeve (11) and a bottom connecting sleeve (12) sleeved on the top and bottom of the central shaft (10), and a plurality of clamping blocks (20) uniformly distributed along the circumference of the outer side of the central shaft (10), characterized in that: The invention also includes a top connecting arm (31) and a bottom connecting arm (32); one end of the top connecting arm (31) is hinged to the top connecting sleeve (11), and the other end is hinged to the top inner side of the block (20); one end of the bottom connecting arm (32) is hinged to the bottom connecting sleeve (12), and the other end is hinged to the bottom inner side of the block (20); a support locking assembly (40) is provided above the top connecting sleeve (11), comprising a support seat (41), a sleeve (42) provided on the support seat (41), and a locking nut (43) provided above the sleeve (42); the top of the top connecting sleeve (11) is hinged to the support seat (41). The bottom of the seat (41) is welded, the upper end of the central shaft (10) passes through the sleeve (42), the top connecting sleeve (11) is slidably connected to the central shaft (10), and the bottom connecting sleeve (12) is fixedly connected to the central shaft (10); an external thread is provided on the outer wall of the upper end of the central shaft (10) to cooperate with the locking nut (43); a first limit retaining ring (51) is provided below the top connecting sleeve (11), and an unlocking spring (54) is provided between the bottom of the top connecting sleeve (11) and the first limit retaining ring (51); a second limit retaining ring (52) is provided above the bottom connecting sleeve (12).

2. The inner hole expansion sling according to claim 1, characterized in that: A middle connecting sleeve (13) is further provided between the top connecting sleeve (11) and the bottom connecting sleeve (12), and a middle connecting arm (33) is further provided between the top connecting arm (31) and the bottom connecting arm (32). One end of the middle connecting arm (33) is hinged to the middle connecting sleeve (13), and the other end is hinged to the middle part of the inner side of the clamping block (20); a third limiting retaining ring (53) is further provided at the bottom of the middle connecting sleeve (13).

3. The inner hole expansion sling according to claim 1, characterized in that: A fixing seat (60) is further provided below the bottom connecting sleeve (12), and the bottom connecting sleeve (12) and the fixing seat (60) are welded together.

4. The inner hole expansion sling according to claim 1, characterized in that: A first limiting pin (71) is also provided between the bottom connecting sleeve (12) and the central shaft (10).

5. The inner hole expansion sling according to claim 2, characterized in that: A second limiting pin (72) is also provided between the middle connecting sleeve (13) and the central shaft (10).

6. The inner hole expansion sling according to claim 1, characterized in that: A rubber pad (21) is provided on the outer side wall of the clamping block (20), and the rubber pad (21) and the clamping block (20) are connected by screws (22).

7. The inner hole expansion hanger according to claim 1, characterized in that: A handle (44) is also provided on the support seat (41), and a lifting lug is provided on the top end of the central shaft (10).

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