Protective device for hoisting jack

Abstract

The utility model discloses a protective device for a hoisting jack, which comprises a mounting base assembled on a hoisting arm of the hoisting jack, a hoisting mechanism used for forming a double-line type hoisting structure, a limiting mechanism used for forming an anti-swing limiting structure, and a buffering mechanism used for forming a top-reaching buffering structure, the hoisting mechanism is arranged on the lower portion of the installation base, the limiting mechanism is assembled on one side of the hoisting mechanism, and the buffering mechanism is arranged on the upper portion of the hoisting mechanism. The hoisting rope is limited while a hoisting material is hoisted through the double-line type hoisting structure, the hoisting hook can be prevented from swinging in the hoisting process, the hoisting stability is improved, the hoisting requirement of the large-size hoisting material is met, the buffering mechanism is arranged, the hoisting hook can be buffered and protected when the hoisting hook ascends to the top, and the hoisting safety is improved. Therefore, damage caused by rigid collision when the hoisting hook is lifted to the top is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to hoist protection structure technical field especially is hoist hoist with protection device. BACKGROUND

[0002] In the prior art, the hoisting machine is a kind of engineering machinery capable of carrying out material hoisting, transportation and unloading operations, which is widely used in hoisting operations and lifting operations under the working conditions of construction site, port, oil field, railway, warehouse, wind power and the like, has become an important tool for reducing labor intensity and improving production efficiency, and hoisting refers to the installation and positioning of equipment by crane or lifting mechanism, and in the process of overhaul or maintenance, equipment, workpieces, tools, materials and the like are hoisted by various hoisting machines to change their positions, when the weight of the material is too large, the hoisting is prone to damage, in order to ensure the safety of hoisting construction, safety protection device is generally used to protect the hoisting equipment, and the lifting structure of the hoisting machine is one of the more important components, in order to prevent the lifting mechanism from colliding with the top during lifting heavy objects, height limiting and buffering protection is required, when the safety height limiting device of the existing hoisting machine is used, the bottom heavy object will appear a short-term rising phenomenon under the action of inertia when the hook reaches the specified height and stops instantaneously, which will cause collision to the safety height limiting device and affect the service life of the device.

[0003] The utility model discloses a kind of protection devices of hoist hoist for the Chinese utility model patent with application No. 202420780090. X, including hoist arm, the hoist arm surface is provided with protection mechanism;The protection mechanism includes installation shell, the installation shell is fixed on hoist arm surface, sliding seat is slidably connected on the left and right sides of the installation shell surface, the sliding seat surface is screwed and is penetrated with knob, the installation shell surface is equipped with limit hole, the sliding seat bottom is fixed with first spring, the first spring bottom is fixed with connecting plate, the connecting plate surface is fixed with fixed plate, the fixed plate surface is fixed with warning light and pressure sensor, the connecting plate surface is slidably connected with movable plate, the movable plate bottom is fixed with buffer pad. However, the hook of this kind of protection device of hoist hoist is hoisted by single-line type lifting structure, and swinging phenomenon occurs during hoisting, hoisting stability is poor, and it cannot meet the hoisting demand of large-volume hoisting material. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of protection device for hoist hoist.

[0005] To achieve the above object, the technical scheme provided by the utility model is as follows:

[0006] The application discloses a protection device for a lifting jack, which comprises a mounting base, a lifting mechanism for forming a double-wire lifting structure, a limiting mechanism for forming a swing limiting structure and a buffer mechanism for forming a top buffer structure.

[0007] The lifting mechanism comprises a lifting beam frame, a lifting assembly and a lifting hook assembly.

[0008] The lifting assembly comprises a lifting base, a lifting motor and a lifting roller.

[0009] The lifting hook assembly comprises a lifting hook base, a lifting hook fixed pulley, a lifting hook movable pulley, a lifting rope and a lifting hook.

[0010] The outer part of the two groups of lifting hook movable pulleys is provided with a protective shell structure, the protective shell structures of the two groups of lifting hook movable pulleys are connected with each other through a mounting frame, the lifting hook is arranged at the lower part of the mounting frame between the two groups of protective shell structures and is arranged between the two groups of lifting hook movable pulleys through the mounting frame and the protective shell structures, and the lifting rope is arranged around the side parts of the two groups of lifting hook movable pulleys and the lifting hook fixed pulley in sequence.

[0011] The limiting mechanism comprises a limiting base, a limiting support, a limiting motor and a limiting roller, the limiting base is arranged at one end of the hoisting beam frame and is fixedly connected with the hoisting beam frame, the limiting support is arranged at the bottom of the limiting base and is fixedly connected with the limiting base, the limiting motor is arranged at the upper inner side of the limiting support and is fixedly connected with the limiting support, the output end of the limiting motor is horizontally arranged, two groups of the limiting rollers are arranged side by side at the output end of the limiting motor and are drivingly connected with the output end of the limiting motor through transmission gears, and the hoisting rope is located between the two groups of the limiting rollers.

[0012] Further comprising a anti-off baffle, the anti-off baffle is arranged at one end of the two groups of the limiting roller away from the limiting motor and is assembled with the limiting roller through screws, the two groups of the limiting roller are arranged side by side and spaced apart, and the two ends of the two groups of the limiting roller away from the limiting motor are connected through the anti-off baffle.

[0013] The buffering mechanism comprises a buffering base block, a buffering mounting plate, an elastic assembly and a buffering top plate, the buffering base block is arranged outside the hook base corresponding to the hook movable pulley and is fixedly connected with the hook base, the buffering mounting plate is arranged at the lower end of the buffering base block and is fixedly connected with the buffering base block, the elastic assembly comprises two groups, the two groups of elastic assemblies are symmetrically arranged at the lower ends of the buffering mounting plate, the buffering top plate is arranged at the lower part of the two groups of elastic assemblies and is connected with the buffering mounting plate through the elastic assembly, and the buffering top plate is arranged in a spaced apart manner with the buffering mounting plate.

[0014] Further comprising a buffering protection pad, the buffering protection pad is arranged at the bottom of the buffering top plate and is fixedly connected with the buffering top plate.

[0015] The elastic assembly comprises a support block and a buffering spring, the support block comprises two groups, the two groups of support blocks are arranged side by side and spaced apart, and the two groups of support blocks are respectively fixedly connected with the buffering mounting plate and the buffering top plate, the buffering spring is arranged between the buffering mounting plate and the buffering top plate corresponding to the two groups of support blocks and is fixedly connected with the buffering mounting plate and the buffering top plate at two ends, and the buffering spring is arranged outside the two groups of support blocks.

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

[0017] The lifting mechanism cooperates with the limiting mechanism, the double-wire type lifting structure of the lifting mechanism is used for lifting the hoisted material and limiting the hoisting rope, the swinging of the lifting hook during the lifting process is prevented, the lifting stability is improved, the lifting demand of the hoisted material with large volume is met, the buffer mechanism is arranged, the lifting hook is buffered and protected when the lifting hook rises to the top, and damage or falling of the lifting hook caused by rigid collision when the lifting hook rises to the top is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a whole structure schematic view of the utility model;

[0019] Figure 2 is a lifting mechanism and installation base cooperation schematic view of the utility model;

[0020] Figure 3 is a limiting mechanism structure schematic view of the utility model;

[0021] Figure 4 is a buffer mechanism structure schematic view of the utility model.

[0022] In the drawing: 1, installation base; 2, lifting beam frame; 3, lifting base; 4, lifting motor; 5, lifting roller; 6, lifting hook base; 7, lifting hook fixed pulley; 8, lifting hook movable pulley; 9, hoisting rope; 10, lifting hook; 11, limiting base; 12, limiting support; 13, limiting motor; 14, limiting roller; 15, anti-falling baffle; 16, buffer base block; 17, buffer mounting plate; 18, buffer top plate; 19, buffer protection pad; 20, supporting block; 21, buffer spring. DETAILED DESCRIPTION

[0023] The utility model will be further described in detail below,

[0024] A kind of hoisting lifter protection device, including installation base 1, installation base 1 is assembled on the lifting arm of hoisting lifter, further include the lifting mechanism for constituting double-wire type lifting structure, the limiting mechanism for constituting anti-swing limiting structure and the buffer mechanism for constituting to top buffer structure, lifting mechanism is arranged in the lower part of installation base 1, limiting mechanism is assembled in one side of lifting mechanism, buffer mechanism is configured in the upper portion of lifting mechanism, the whole structure schematic view of the utility model as Figure 1 It is shown.

[0025] The hoisting mechanism comprises a hoisting beam frame 2, a lifting assembly and a hook assembly, the hoisting beam frame 2 is arranged at the lower part of the mounting base 1 and is fixedly connected with the mounting base 1 through a mounting seat, the lifting assembly is arranged at the bottom of the hoisting beam frame 2, the hook assembly is arranged at the lower part of the lifting assembly, the hoisting mechanism is composed of the hoisting beam frame 2, the lifting assembly and the hook assembly in cooperation, and a double-line type lifting structure is formed to ensure the lifting stability of hoisted materials, wherein the hoisting beam frame 2 is used for providing mounting support for the lifting assembly and the hook assembly, the lifting assembly is used for driving the hoisting hook 10 to ascend or descend, and the hook assembly is used for forming the double-line type lifting structure to ensure the lifting stability of hoisted materials. Figure 2

[0026] The lifting assembly comprises a lifting base 3, a lifting motor 4 and a lifting roller 5, the lifting base 3 is arranged at the bottom of the hoisting beam frame 2 and is fixedly connected with the hoisting beam frame 2, the lifting motor 4 is arranged at one side of the lifting base 3 and is fixedly connected with the lifting base 3, the output end of the lifting motor 4 penetrates through the lifting base 3, the lifting roller 5 is arranged at the output end of the lifting motor 4 and is fixedly connected with the output end of the lifting motor 4, the lifting assembly is composed of the lifting base 3, the lifting motor 4 and the lifting roller 5 in cooperation, and the hoisting hook 10 is driven to ascend or descend, wherein the lifting base 3 is used for providing mounting support for the lifting motor 4, the lifting motor 4 is used for providing mounting support for the lifting roller 5 and driving the lifting roller 5 to rotate through the rotation of the output end, and the lifting roller 5 is used for rotating under the action of the lifting motor 4, so as to drive the hook movable pulley 8 and the hoisting hook 10 to ascend or descend through the hoisting rope 9.

[0027] ​The hook assembly comprises a hook base 6, a hook fixed pulley 7, hook movable pulleys 8, a hoisting rope 9 and a hoisting hook 10. The hook base 6 is arranged on one side of the hoisting beam frame 2 corresponding to the lifting roller 5 and is fixedly connected to the upper end of the hoisting beam frame 2. The hook fixed pulley 7 is arranged on the inner side of the lower part of the hook base 6 and is rotatably connected to the hook base 6 through a rotating shaft. The hook movable pulleys 8 are arranged in two groups and are arranged side by side below the hook fixed pulley 7. The hoisting rope 9 is arranged around the hook fixed pulley 7 and the hook movable pulleys 8 and is fixedly connected to the lifting roller 5 at one end. The end of the hoisting rope 9 away from the lifting roller 5 is fixedly connected to the hoisting beam frame 2 through a mounting head. The hoisting hook 10 is arranged at the lower part of the two groups of hook movable pulleys 8. The hook assembly cooperates with the hook base 6, the hook fixed pulley 7, the hook movable pulleys 8, the hoisting rope 9 and the hoisting hook 10 to form a double-line lifting structure to ensure the lifting stability of the hoisted material. The hook base 6 is used to provide mounting support for the hook fixed pulley 7 to mount the hook fixed pulley 7 on the hoisting beam frame 2. The hook fixed pulley 7 is used to guide the hoisting rope 9. The hook movable pulleys 8 are used to form a hoisting pulley set structure with the hook fixed pulley 7 and provide mounting support for the hoisting hook 10. The hoisting rope 9 is used to connect the hook fixed pulley 7 and the hook movable pulleys 8 and drive the hook movable pulleys 8 and the hoisting hook 10 to perform lifting actions under the driving of the lifting roller 5. The hoisting hook 10 is used to perform lifting actions under the driving of the hook movable pulleys 8 to hoist and lift the hoisted material.

[0028] The two groups of hook movable pulleys 8 are provided with protective shell structures. The protective shell structures outside the two groups of hook movable pulleys 8 are connected to each other through mounting racks. The hoisting hook 10 is arranged at the lower part of the mounting rack between the two groups of protective shell structures and is arranged between the two groups of hook movable pulleys 8 through the mounting rack and the protective shell structures. The hoisting rope 9 is arranged around the side parts of the two groups of hook movable pulleys 8 and the hook fixed pulley 7 in sequence. The two groups of hook movable pulleys 8 are connected to the hook fixed pulley 7 through the hoisting rope 9. The protective shell structures cooperate with the mounting racks to connect the two groups of hook movable pulleys 8 and provide mounting support for the hoisting hook 10. The hoisting rope 9, together with the two groups of hook movable pulleys 8 and the hook fixed pulley 7, forms a double-line lifting structure to effectively improve the hoisting stability.

[0029] The limiting mechanism includes a limiting base 11, a limiting bracket 12, a limiting motor 13, and limiting rollers 14. The limiting base 11 is located at one end of the lifting beam 2 and is fixedly connected to the lifting beam 2. The limiting bracket 12 is located at the bottom of the limiting base 11 and is fixedly connected to the limiting base 11. The limiting motor 13 is located on the upper inner side of the limiting bracket 12 and is fixedly connected to the limiting bracket 12. The output end of the limiting motor 13 is horizontally positioned. There are two sets of limiting rollers 14, which are arranged side by side at the output end of the limiting motor 13 and are connected to the output end of the limiting motor 13 through a transmission gear. The lifting rope... The hoisting rope 9 is located between two sets of limiting rollers 14. The limiting mechanism, through the cooperation of the limiting base 11, the limiting bracket 12, the limiting motor 13, and the limiting rollers 14, forms a limiting structure to limit the hoisting rope 9, thereby improving hoisting stability. The limiting base 11 provides installation support for the limiting bracket 12, the limiting bracket 12 provides installation support for the limiting motor 13, and the limiting motor 13 drives the limiting rollers 14 to rotate through the rotation of its output end. The limiting rollers 14 rotate under the action of the limiting motor 13, thus coordinating with the lifting and lowering action of the hoisting rope 9. A schematic diagram of the limiting mechanism structure of this utility model is shown below. Figure 3 As shown.

[0030] It also includes an anti-detachment baffle 15, which is disposed at the end of the two sets of limiting rollers 14 away from the limiting motor 13 and is assembled and connected to the limiting rollers 14 by screws. The two sets of limiting rollers 14 are arranged side by side with intervals, and the ends of the two rollers away from the limiting motor 13 are connected by the anti-detachment baffle 15. The anti-detachment baffle 15 is used as an anti-detachment structure on the outside of the limiting rollers 14 to prevent the lifting rope 9 from coming off between the limiting rollers 14.

[0031] The buffering mechanism comprises a buffering base block 16, a buffering mounting plate 17, elastic assemblies and a buffering top plate 18, the buffering base block 16 is arranged on the outer side of the hook base 6 corresponding to the hook movable pulley 8 and is fixedly connected with the hook base 6, the buffering mounting plate 17 is arranged at the lower end of the buffering base block 16 and is fixedly connected with the buffering base block 16, the elastic assemblies are provided in two groups, the two groups of elastic assemblies are symmetrically arranged at the lower two ends of the buffering mounting plate 17, the buffering top plate 18 is arranged at the lower part of the two groups of elastic assemblies and is connected with the buffering mounting plate 17 through the elastic assemblies, the buffering top plate 18 is arranged in a spaced manner with the buffering mounting plate 17, and the buffering mechanism buffers the hook movable pulley 8 and the lifting hook 10 to the top through cooperation of the buffering base block 16, the buffering mounting plate 17, the elastic assemblies and the buffering top plate 18, wherein the buffering base block 16 is used for providing mounting support for the buffering mounting plate 17 to mount the buffering mounting plate 17 on the hook base 6, the buffering mounting plate 17 is used for providing mounting support for the elastic assemblies, the elastic assemblies are used for elastically connecting the buffering top plate 18 with the buffering mounting plate 17, and the buffering top plate 18 is used for buffering the hook movable pulley 8 and the lifting hook 10 to the top under the action of the elastic assemblies, and the buffering mechanism structure diagram is shown in the utility model Figure 4 .

[0032] Further comprising a buffering protection pad 19, the buffering protection pad 19 is arranged at the bottom of the buffering top plate 18 and is fixedly connected with the buffering top plate 18, wherein the buffering protection pad 19 is used as a protection structure at the bottom of the buffering top plate 18 and prevents the hook movable pulley 8 and the lifting hook 10 from being damaged by rigid collision when buffering the hook movable pulley 8 and the lifting hook 10 to the top.

[0033] The elastic assembly comprises supporting blocks 20 and buffering springs 21, the supporting blocks 20 are provided in two groups, the two groups of supporting blocks 20 are arranged in parallel and are spaced apart and are respectively fixedly connected with the buffering mounting plate 17 and the buffering top plate 18, the buffering springs 21 are arranged between the buffering mounting plate 17 and the buffering top plate 18 corresponding to the two groups of supporting blocks 20 and are respectively fixedly connected with the buffering mounting plate 17 and the buffering top plate 18 at two ends, and the buffering springs 21 are arranged on the outer side of the two groups of supporting blocks 20, the elastic assembly cooperates with the supporting blocks 20 and the buffering springs 21, is used as a buffering structure between the buffering mounting plate 17 and the buffering top plate 18 to elastically connect the buffering top plate 18 with the buffering mounting plate 17, wherein the supporting blocks 20 are used as limiting support structures between the buffering mounting plate 17 and the buffering top plate 18, the buffering springs 21 are used for elastically connecting the buffering mounting plate 17 with the buffering top plate 18 and together with the supporting blocks 20 constitute the buffering structure between the buffering mounting plate 17 and the buffering top plate 18.

[0034] Wherein, the buffering mechanism can be arranged on one side or both sides of the hook base 6 according to actual use requirements.

[0035] Working principle:

[0036] The lifting mechanism, the limiting mechanism and the buffer mechanism are assembled on the lifting boom of the lifting jack through the mounting base 1, when the lifting operation of the lifting material is needed, the lifting material is hung on the lifting hook 10, the lifting motor 4 drives the lifting roller 5 to rotate, so as to wind the lifting rope 9, the lifting rope 9 drives the lifting hook movable pulley 8 and the lifting hook 10 to rise, in the rising process, the double-wire lifting structure cooperates with the limiting mechanism to avoid the lifting hook movable pulley 8 and the lifting hook 10 from shaking, the stability of lifting is ensured, when reaching the top, the buffer top plate 18 buffers the lifting hook movable pulley 8 and the lifting hook 10 to the top to prevent the lifting hook movable pulley 8 and the lifting hook 10 from being damaged due to rigid collision.

[0037] The utility model discloses beneficial effect is equipped with lifting mechanism and limiting mechanism cooperation, through its double-wire lifting structure to the lifting material of lifting operation is carried out to the lifting rope and is positioned, can prevent the swinging phenomenon of lifting hook in the lifting process, promotes the stability of lifting, satisfies the lifting demand of bulky lifting material, is equipped with buffer mechanism, can when the lifting hook rises to the top to the buffer protection of lifting hook, thereby avoiding the rigid collision of lifting hook to reach the top and causing damage or falling off.

[0038] The above embodiment of the utility model has been described in detail, but the content is only the preferred embodiment of the utility model, and cannot be considered for limiting the scope of the utility model. Any equivalent change and improvement within the scope of the utility model application should still belong to the patent coverage range of the utility model.

Claims

1. A protection device for a lifting jack, comprising a mounting base (1) which is fitted on a jib of a lifting jack, characterized in that, It also includes a hoisting mechanism for forming a double-line lifting structure, a limiting mechanism for forming an anti-sway limiting structure, and a buffer mechanism for forming a top-mounted buffer structure. The hoisting mechanism is arranged at the lower part of the mounting base (1), the limiting mechanism is mounted on one side of the hoisting mechanism, and the buffer mechanism is arranged at the upper part of the hoisting mechanism.

2. A safety device for a hoisted load as claimed in claim 1, characterised in that, The hoisting mechanism includes a hoisting beam (2), a lifting assembly, and a hook assembly. The hoisting beam (2) is located at the lower part of the mounting base (1) and is fixedly connected to the mounting base (1) through a mounting seat. The lifting assembly is arranged at the bottom of the hoisting beam (2), and the hook assembly is located at the lower part of the lifting assembly.

3. A protective device for a lifting jack as claimed in claim 2, characterised in that, The lifting assembly includes a lifting base (3), a lifting motor (4), and a lifting roller (5). The lifting base (3) is located at the bottom of the hoisting beam (2) and is fixedly connected to the hoisting beam (2). The lifting motor (4) is located on one side of the lifting base (3) and is fixedly connected to the lifting base (3). The output end of the lifting motor (4) passes through the lifting base (3). The lifting roller (5) is located at the output end of the lifting motor (4) and is fixedly connected to the output end of the lifting motor (4).

4. A protective device for a lifting jack as claimed in claim 3, characterised in that, The hook assembly includes a hook base (6), a fixed hook pulley (7), a movable hook pulley (8), a lifting rope (9), and a lifting hook (10). The hook base (6) is located on one side of the lifting beam (2) corresponding to the lifting roller (5), and its upper end is fixedly connected to the lifting beam (2). The fixed hook pulley (7) is located on the lower inner side of the hook base (6) and is rotatably connected to the hook base (6) through a rotating shaft. The movable hook pulley (8) is located on... There are two sets of hook movable pulleys (8), which are arranged side by side below the hook fixed pulley (7). The lifting rope (9) is arranged around the hook fixed pulley (7) and the hook movable pulley (8), and one end of the rope is fixedly connected to the lifting roller (5). The end of the lifting rope (9) away from the lifting roller (5) is fixedly connected to the lifting beam frame (2) through the mounting head. The lifting hook (10) is arranged at the lower part of the two sets of hook movable pulleys (8).

5. A protective device for a lifting jack as claimed in claim 4, characterised in that, The two sets of hook pulleys (8) are provided with protective shell structures. The protective shell structures of the two sets of hook pulleys (8) are connected to each other by a mounting frame. The lifting hook (10) is set at the lower part of the mounting frame between the two sets of protective shell structures and is configured between the two sets of hook pulleys (8) through the mounting frame and the protective shell structure. The lifting rope (9) is arranged around the sides of the two sets of hook pulleys (8) and the hook fixed pulley (7) in sequence. The two sets of hook pulleys (8) are connected to the hook fixed pulley (7) through the lifting rope (9).

6. A protective device for a lifting jack as claimed in claim 5, characterised in that, The limiting mechanism comprises a limiting base (11), a limiting support (12), a limiting motor (13) and a limiting rotating roller (14), the limiting base (11) is arranged at one end of the hoisting beam frame (2) and fixedly connected with the hoisting beam frame (2), the limiting support (12) is arranged at the bottom of the limiting base (11) and fixedly connected with the limiting base (11), the limiting motor (13) is arranged at the inner side of the upper part of the limiting support (12) and fixedly connected with the limiting support (12), the output end of the limiting motor (13) is horizontally arranged, the limiting rotating roller (14) is provided in two groups, the two groups of limiting rotating rollers (14) are arranged side by side at the output end of the limiting motor (13) and drivingly connected with the output end of the limiting motor (13) through a transmission gear, and the hoisting rope (9) is located between the two groups of limiting rotating rollers (14).

7. A protective device for a lifting jack as claimed in claim 6, characterised in that, Further comprising a anti-off baffle (15), the anti-off baffle (15) is arranged at one end of the two groups of limiting rotating rollers (14) away from the limiting motor (13) and is assembled and connected with the limiting rotating roller (14) through screws, the two groups of limiting rotating rollers (14) are arranged side by side and spaced apart, and the two ends of the two groups of limiting rotating rollers (14) away from the limiting motor (13) are connected through the anti-off baffle (15).

8. A protective device for a lifting jack as claimed in claim 7, characterised in that, The buffer mechanism comprises a buffer base block (16), a buffer mounting plate (17), an elastic assembly and a buffer top plate (18), the buffer base block (16) is arranged outside the hook base (6) corresponding to the hook movable pulley (8) and fixedly connected with the hook base (6), the buffer mounting plate (17) is arranged at the lower end of the buffer base block (16) and fixedly connected with the buffer base block (16), the elastic assembly is provided in two groups, the two groups of elastic assemblies are symmetrically arranged at the lower ends of the buffer mounting plate (17), the buffer top plate (18) is arranged at the lower part of the two groups of elastic assemblies and connected with the buffer mounting plate (17) through the elastic assembly, and the buffer top plate (18) is arranged spaced apart from the buffer mounting plate (17).

9. A protective device for a lifting jack as claimed in claim 8, characterised in that, Further comprising a buffer protection pad (19), the buffer protection pad (19) is arranged at the bottom of the buffer top plate (18) and fixedly connected with the buffer top plate (18).

10. A protective device for a lifting jack as claimed in claim 9, characterised in that, The elastic assembly comprises a support block (20) and a buffer spring (21), the support block (20) is provided in two groups, the two groups of support blocks (20) are arranged side by side and spaced apart, and the two groups of support blocks (20) are respectively fixedly connected with the buffer mounting plate (17) and the buffer top plate (18), the buffer spring (21) is arranged between the buffer mounting plate (17) and the buffer top plate (18) corresponding to the two groups of support blocks (20) and its two ends are respectively fixedly connected with the buffer mounting plate (17) and the buffer top plate (18), and the buffer spring (21) is arranged outside the two groups of support blocks (20).

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