Automatic unhooking structure of lifting appliance

Abstract

The utility model belongs to the technical field of lifting, and relates to an automatic unhooking structure of a lifting appliance, which comprises a hook and is characterized by further comprising a mounting main body, a telescopic mechanism and a sliding limiting mechanism, the telescopic mechanism and the sliding limiting mechanism are respectively mounted at two ends of the mounting main body, and the bottom of the telescopic mechanism extends out of the bottom of the mounting main body. One end of the hook is hinged to the bottom of the telescopic mechanism, and the other end of the hook is limited in the sliding limiting mechanism. The automatic unhooking structure is scientific and reasonable in design, has the advantages of being convenient to unhook and reset, low in manufacturing cost, long in service life, capable of improving hoisting efficiency and easy to implement, and has high innovativeness.

Description

Technical Field

[0001] The utility model belongs to the technical field of hoisting, and relates to a sling, in particular to an automatic unhooking structure of the sling. Background Art

[0002] A sling refers to a device used to lift heavy objects in lifting machinery. Hooks, as a common form of sling, are widely used in the lifting and hoisting industry.

[0003] In order to facilitate the lifting operation of heavy objects, slings with automatic unhooking function have appeared on the market. For example, the publication number is CN219906713U, and the publication date is October 27, 2023. The Chinese patent name is an automatic unhooking sling. When the heavy object is unhooked, the heavy object falls to the ground so that the hook is no longer subjected to downward traction. The mounting ring rotates on the mounting shaft, and the counterweight plate falls and drives the hook to lift up, so that the traction rope on the hook naturally slides off the hook, realizing automatic unhooking of the heavy object; after unloading the heavy object, the drive motor is turned on to drive the winding drum to rotate, so that the steel wire is wound around the surface of the winding drum, and at the same time, the counterweight plate is pulled upward until it contacts the limit slot, thereby realizing automatic resetting of the counterweight plate, facilitating the next round of lifting and increasing practicality.

[0004] Although the above patent realizes the automatic unhooking function of the spreader, its structure is relatively complex, and a motor is required when the hook returns to its original position, which not only increases the cost of the spreader, but also easily affects its service life due to bumps. Utility Model Content

[0005] The purpose of the utility model is to provide an automatic unhooking structure for a sling which has a scientific and reasonable structural design, is convenient for unhooking and resetting, has a low manufacturing cost, a long service life and is easy to implement.

[0006] The utility model solves the technical problem by the following technical solutions:

[0007] An automatic unhooking structure for a sling includes a hook, and is characterized in that it also includes a mounting body, a telescopic mechanism and a sliding limit mechanism, wherein the telescopic mechanism and the sliding limit mechanism are respectively installed at both ends of the mounting body, the bottom of the telescopic mechanism extends from the bottom of the mounting body, one end of the hook is hinged to the bottom of the telescopic mechanism, and the other end of the hook is limited in the sliding limit mechanism.

[0008] Moreover, the mounting body includes a mounting block and a mounting plate symmetrically arranged front and back at one end of the mounting block, a longitudinal telescopic hole is provided on the mounting block, a telescopic mechanism is installed in the telescopic hole, one end of the hook is hinged on the bottom of the telescopic mechanism, sliding holes are symmetrically provided on the two mounting plates, a sliding limit mechanism is slidably installed on the sliding hole between the two mounting plates, and the other end of the hook is opened and closed at the sliding limit mechanism.

[0009] Moreover, the telescopic mechanism includes a telescopic limit column and a spring. A telescopic limit column with a limit cap on the top is installed in the telescopic hole. A spring is installed on the telescopic limit column. One end of the spring abuts against the limit cap, and the other end abuts against the support platform set in the telescopic hole. A hook is hinged at the bottom of the telescopic limit column.

[0010] Moreover, a limiting ring is provided at the lower position of the telescopic limiting column.

[0011] Moreover, the limiting ring is a limiting boss integrally formed with the telescopic limiting column, or a limiting ring sleeved on the telescopic limiting column.

[0012] Moreover, the sliding hole is composed of a first vertical long hole, a second vertical long hole and an arc-shaped long hole. The first vertical long hole is vertically arranged on the side of the mounting plate close to the hook, and an arc-shaped long hole is arranged on the outside of the first vertical long hole. The curvature of the arc-shaped long hole is a trajectory formed by an arc with the top of the first vertical long hole as the center of the circle, and a second vertical long hole is connected to the lower part of the arc-shaped long hole.

[0013] Moreover, the sliding limit mechanism includes a first sliding rod, a second sliding rod and a sliding limit block, and a first through-hole and a second through-hole are respectively provided at the diagonal positions on the block body of the sliding limit block. The first sliding rod is installed in the first through-hole of the sliding limit block and is slidably installed in the first vertical long hole. The second sliding rod is installed in the second through-hole of the sliding limit block and is slidably installed in the second vertical long hole and the arc-shaped long hole. Blocking pieces are provided at both ends of the first sliding rod and the second sliding rod.

[0014] Moreover, the hook body of the hook is a structure with a limiting step provided on its outer end surface, and the limiting step is limited on the inner side of the sliding limiting block.

[0015] The advantages and beneficial effects of the utility model are:

[0016] 1. The automatic unhooking mechanism of this sling achieves the purpose of locking the load after lifting and automatically unhooking after lowering by cooperating with the sliding limit block in the sliding limit mechanism through the telescopic hook. To return the load to its original position, the hook can be returned to the inner side of the sliding limit block by pulling the sliding limit block outward. This simple and convenient operation greatly improves lifting efficiency and lifting costs. Furthermore, this utility model has a simple structure, is easy to manufacture and process, and is reliable and easy to operate.

[0017] 2. The utility model is scientifically and rationally designed, and has the advantages of convenient unhooking and resetting, low manufacturing cost, long service life, improved lifting efficiency, and easy implementation. It is an automatic unhooking structure of a sling with high innovation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the utility model;

[0019] Figure 2 This is a structural diagram of the hook of the utility model slipping off the sliding limit block;

[0020] Figure 3 This is a bottom view of the hook of the utility model sliding off the sliding limit block (the sliding hole is omitted);

[0021] Figure 4 This is a schematic diagram of the relative positions of the sliding limit block and the hook when hanging heavy objects in the utility model;

[0022] Figure 5 This is a schematic diagram of the relative positions of the sliding limit block and the hook after the heavy object is hung on the utility model;

[0023] Figure 6 This is a schematic diagram of the relative positions of the sliding limit block and the hook when unloading heavy objects in the utility model.

[0024] Reference numerals

[0025] 1-installation body, 2-limiting cap, 3-spring, 4-telescopic limiting column, 5-first sliding rod, 6-first vertical long hole, 7-arc-shaped long hole, 8-second sliding rod, 9-second vertical long hole, 10-hook, 11-installation block, 12-installation plate, 13-sliding hole, 14-sliding limiting mechanism, 15-sliding limiting block, 16-second through hole, 17-first through hole, 18-limiting step, 19-limiting ring. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below through specific embodiments. The following embodiments are merely illustrative and non-restrictive, and should not be used to limit the scope of protection of the present invention.

[0027] An automatic unhooking structure for a sling includes a hook 10 for hanging heavy objects. Its innovation lies in: it also includes an installation body 1, a telescopic mechanism and a sliding limiting mechanism 14 for limiting and releasing the hook. When the hook is limited, reliable lifting of the heavy object is achieved. When the hook is released, automatic unhooking of the heavy object is achieved.

[0028] The installation body includes a mounting block 11 and a mounting plate 12 symmetrically arranged at one end of the mounting block. Figures 1 to 3 As shown, the mounting body is an integrally formed structure, that is, the mounting block and the mounting plate are integrally arranged, the portion of the mounting plate is higher than the portion of the mounting block, a longitudinal telescopic hole is provided on the mounting block, a telescopic mechanism is installed in the telescopic hole, one end of the hook is hinged on the bottom of the telescopic mechanism, sliding holes 13 are symmetrically provided on the two mounting plates, a sliding limit mechanism is slidably installed on the sliding hole between the two mounting plates, the other end of the hook is inserted between the two mounting plates, and opening and closing are realized at the sliding limit mechanism.

[0029] The telescopic mechanism includes a telescopic limit column 4 and a spring 3. A telescopic limit column with a limit cap 2 on the top is installed in the telescopic hole. A spring is installed on the telescopic limit column. One end of the spring abuts against the limit cap, and the other end abuts against the support platform set in the telescopic hole. A hook is hinged at the bottom of the telescopic limit column.

[0030] To prevent the telescopic limit post from falling out of the telescopic hole, a limit ring 19 is provided at the lower portion of the telescopic limit post. The limit ring, spring, and limit cap cooperate to retain the telescopic limit post within the telescopic hole. The limit ring can be a limit boss integrally formed with the telescopic limit post or a limit ring fitted onto the telescopic limit post. The limit boss or limit ring abuts the bottom surface of the telescopic hole.

[0031] The sliding hole is used to guide and limit the travel track of the sliding limit mechanism to control the state of the sliding limit mechanism, thereby realizing the control of the hook state. Figure 1 and Figure 2 As shown, the sliding hole is composed of a first vertical long hole 6, a second vertical long hole 9 and an arc-shaped long hole 7. The first vertical long hole is vertically provided on the side of the mounting plate close to the hook, and an arc-shaped long hole is provided on the outside of the first vertical long hole. The curvature of the arc-shaped long hole is a trajectory formed by an arc with the top of the first vertical long hole as the center of the circle, and a second vertical long hole is provided in communication with the lower part of the arc-shaped long hole.

[0032] The sliding limit mechanism includes a first sliding rod 5, a second sliding rod 8 and a sliding limit block 15. A first through hole 17 and a second through hole 16 are respectively provided at the diagonal positions on the block body of the sliding limit block. The first sliding rod is installed in the first through hole of the sliding limit block and is slidably installed in the first vertical long hole. The second sliding rod is installed in the second through hole of the sliding limit block and is slidably installed in the second vertical long hole and the arc-shaped long hole. Blocking pieces are provided at both ends of the first sliding rod and the second sliding rod.

[0033] The hook body of the hook is a structure in which a limiting step 18 is provided on its outer end face, and the limiting step is limited to the inner side of the sliding limiting block. In order to facilitate the hook to slip off from the sliding limiting block, the end of the hook is a sloped structure.

[0034] The utility model is a part of a lifting tool. During a specific lifting operation, hanging plates are arranged on the front and rear sides of an installation body of the utility model, a top plate is arranged between the two hanging plates, and a lifting ring is arranged on the top plate.

[0035] Working principle:

[0036] like Figure 4 As shown, when the present invention is not in use, the hook is located on the inner side of the sliding limit block. At this time, the first slide rod is placed at a lower position in the first vertical long hole, and the second slide rod is placed at a lower position in the second sliding long hole. The sliding limit block completely locks the hook.

[0037] like Figure 5 As shown, after the utility model is hoisted with a heavy object, the gravity of the heavy object gives the hook a downward pulling force. At this time, the telescopic limit column moves downward, and the spring is compressed until a "click" sound is heard, and the limit step of the hook is clamped at the bottom of the sliding limit block; at this time, the first slide bar is placed in the lower position of the first vertical long hole, and the second slide bar is placed in the lower position of the second vertical long hole;

[0038] like Figure 6 As shown, when the utility model is to take off the heavy object hung thereon, after the heavy object is hoisted to the destination, the hook loses the pulling force of the heavy object on it. At this time, the telescopic limit column moves upward. During the upward movement, the limit step of the hook lifts the sliding limit block to move upward. At this time, the first slide bar is placed in the upper position of the first vertical long hole, and the second slide bar is placed at the intersection of the second sliding long hole and the arc-shaped long hole. Then the second slide bar makes an arc movement in the arc-shaped long hole, so that the sliding limit block opens outward, thereby releasing the hook.

[0039] In order to facilitate the resetting of the sliding limit block, a wrench can be provided on the top of the sliding limit block, and the sliding limit block can be reset by operating the wrench; or the sliding limit block can be directly moved.

[0040] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will understand that various replacements, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. An automatic unhooking structure for a spreader, comprising a hook, characterized in that: The device further comprises a mounting body, a telescopic mechanism and a sliding limit mechanism, wherein the telescopic mechanism and the sliding limit mechanism are respectively mounted on both ends of the mounting body, the bottom of the telescopic mechanism extends from the bottom of the mounting body, one end of the hook is hinged to the bottom of the telescopic mechanism, and the other end of the hook is limited in the sliding limit mechanism; The mounting body includes a mounting block and a mounting plate symmetrically arranged at one end of the mounting block. A longitudinal telescopic hole is provided on the mounting block, a telescopic mechanism is installed in the telescopic hole, one end of the hook is hingedly mounted on the bottom of the telescopic mechanism, sliding holes are symmetrically provided on the two mounting plates, a sliding limit mechanism is slidably installed on the sliding hole between the two mounting plates, and the other end of the hook is opened and closed at the sliding limit mechanism; The sliding hole is composed of a first vertical long hole, a second vertical long hole and an arc-shaped long hole. The first vertical long hole is vertically provided on the side of the mounting plate close to the hook, and an arc-shaped long hole is provided on the outside of the first vertical long hole. The arc of the arc-shaped long hole is a trajectory formed by an arc with the top of the first vertical long hole as the center of the circle. The second vertical long hole is provided in communication with the lower part of the arc-shaped long hole. The sliding limit mechanism includes a first sliding rod, a second sliding rod and a sliding limit block. A first through-hole and a second through-hole are respectively provided at the diagonal positions on the block body of the sliding limit block. The first sliding rod is installed in the first through-hole of the sliding limit block and is slidably installed in the first vertical long hole. The second sliding rod is installed in the second through-hole of the sliding limit block and is slidably installed in the second vertical long hole and the arc-shaped long hole. Blocking pieces are provided at both ends of the first sliding rod and the second sliding rod.

2. The automatic unhooking structure of a sling according to claim 1, characterized in that: The telescopic mechanism includes a telescopic limit column and a spring. A telescopic limit column with a limit cap on the top is installed in the telescopic hole. A spring is installed on the telescopic limit column. One end of the spring abuts against the limit cap, and the other end abuts against the support platform set in the telescopic hole. A hook is hinged at the bottom of the telescopic limit column.

3. The automatic unhooking structure of a sling according to claim 2, characterized in that: A limiting ring is also provided at the lower position of the telescopic limiting column.

4. The automatic unhooking structure of a sling according to claim 3, characterized in that: The limiting ring is a limiting boss integrally formed with the telescopic limiting column, or a limiting ring sleeved on the telescopic limiting column.

5. The automatic unhooking structure of a sling according to claim 4, characterized in that: The hook body of the hook is a structure with a limiting step provided on its outer end surface, and the limiting step is limited on the inner side of the sliding limiting block.

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