Fall arrest safety device and hoisting apparatus for industrial doors

Abstract

The application discloses a falling prevention safety device and lifting equipment of an industrial door, and the side of a door plate is also provided with a shaft which is rotatably connected with a wheel body of a cam; a torsional spring is also arranged on the shaft, and a preset torsional force of the torsional spring can drive the wheel body to rotate, so that the protruding part of the cam is in contact with the inner wall of the track and is locked. The application adopts the cam to cooperate with hard rubber, when the steel wire rope is broken, the cam is released, the friction force between the hard rubber and the track is used to realize the braking of the lifting door, the falling of the lifting door is prevented, and the application has the characteristics of simple structure, low cost and convenient maintenance.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of industrial door anti-falling safety device, specifically anti-falling safety device and the lifting equipment of industrial door. BACKGROUND

[0002] With the rapid development of logistics industry, industrial lifting door is also widely used in logistics warehouse and other places. Industrial lifting door is generally driven by motor to lift, including track assembly, door plate assembly, drum assembly, control box assembly, steel wire rope, manual release device. Motor drives drum to realize industrial lifting door to slide up and down along guide rail to open and close door. If there is no anti-falling safety device, once the steel wire rope breaks down, the lifting door will fall freely at a high speed, which not only damages the equipment, but also has great safety hazard. The commonly used anti-falling device usually adopts multi-section gear or worm gear self-locking structure, which has high cost and complex maintenance and other problems. SUMMARY

[0003] The present application is to solve the existing problems, and aims to provide an anti-falling safety device and the lifting equipment of industrial door to prevent the falling accident caused by the breakage of steel wire rope.

[0004] In order to achieve the above purpose, the side of the door plate is slid up and down in the track through the pulley, and the side of the door plate is also provided with a shaft, which is rotatably connected with the wheel body of the cam. A torsional spring is also provided on the shaft, and the preset torsional force of the torsional spring can drive the wheel body to rotate, so that the protruding part of the cam is in contact with and locked by the inner wall of the track.

[0005] As a preferred, a connecting column is provided on the cam, and the steel wire rope for lifting the door plate is connected with the connecting column. The tension of the steel wire rope drives the cam to rotate against the torsional force of the torsional spring, so that the protruding part of the cam is not in contact with the inner wall of the track.

[0006] As a preferred, one end of the torsional spring is fixed on the shaft long hole, and the other end is fixed on the cylindrical boss of the cam.

[0007] As a preferred, the protruding part of the cam is provided with a rubber layer with sawtooth surface.

[0008] As a preferred, the rubber layer is made of polyurethane rubber material.

[0009] As a preferred, a spacing space is provided between the sawtooth rubber and the protruding part of the cam, so as to ensure that the sawtooth polyurethane rubber has a certain amount of expansion when it is extruded.

[0010] As a preferred, a limiting hole is provided on the wheel body of the cam, and a limiting rod is arranged in the limiting hole. The shape of the limiting hole corresponds to the rotation track.

[0011] As preferred, the cam mechanism is two, and the convex parts of the cams are mirror image arranged, respectively aligning the inner walls of the two sides of the track.

[0012] As preferred, the two cams are linked by a connecting lever; the lever is a casting.

[0013] As preferred, the two ends of the connecting lever are respectively rotatably connected with the cylindrical bosses on the two cams.

[0014] The above-mentioned anti-falling safety device comprises two pairs of cam systems and a support mounting the cam systems, a steel wire rope and a cam link above the cam systems. The cam mechanism comprises a cam, and a serrated polyurethane rubber integrally formed with the cam, which plays a braking role.

[0015] A torsion spring is mounted on the cam and the cam shaft, and the torsion force of the torsion spring fixes the cam at the original position. One end of the torsion spring is fixed on the shaft long hole, and the other end is fixed on the cylindrical boss of the cam. The steel wire rope is connected with the steel wire rope connecting column. When the steel wire rope breaks or other accidents occur, the tension of the steel wire rope on the cam disappears, and the cam rotates under the action of the torsion spring. The serrated rubber on the cam is pressed against the track surface, generating friction force to prevent the door panel from falling.

[0016] The present application also provides a lifting device for an industrial door, comprising a track assembly, a motor assembly, a door panel assembly and an electrical control box, and any of the anti-falling safety devices is mounted.

[0017] As preferred, the anti-falling safety devices are respectively mounted on the left and right sides of the door panel, and provide tension through the steel wire rope and the motor.

[0018] Compared with the prior art, the present application adopts a cam cooperating with hard rubber. When the steel wire rope breaks, the cam is released, and the friction between the hard rubber and the track realizes the braking of the lifting door, preventing the lifting door from falling. The present application has the characteristics of simple structure, low cost and convenient maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Fig. 1 is a structural schematic diagram of an industrial lifting door;

[0020] Figure 2 Fig. 2 is a structural schematic diagram of an embodiment of the present application;

[0021] Figure 3 Fig. 3 is a structural schematic diagram of a cam mechanism;

[0022] Figure 4a 、 Figure 4b Fig. 4 is a structural schematic diagram of a cam;

[0023] Figure 5 Fig. 5 is a working state schematic diagram of an embodiment of the present application when the lifting door is normally lifted;

[0024] Figure 6 Fig. 1 is a schematic diagram of the working state of the embodiment of the present application when the industrial lifting door falls;

[0025] Referring to the drawings, A anti-falling safety device, 100 cam system, 101 cam, 102 sawtooth polyurethane rubber, 103 torsion spring, 104 cylindrical boss, 105 steel wire rope connecting column, 106 shaft, 107 limiting rod, 108 limiting hole, 109 connecting lever, 110 bracket, 300 industrial lifting door, 200 steel wire rope, 301 track, 302 motor assembly, 303 torsion spring balance system, 304 door panel assembly, 305 electrical control box, 401 guide rail pulley assembly, 402 steel wire rope drum. DETAILED DESCRIPTION

[0026] In order to further illustrate the present application, the following further detailed description is made in connection with the drawings of the preferred embodiments of the present application.

[0027] This embodiment takes the industrial lifting door as an example to introduce the main structure of the industrial lifting equipment provided by the present application. Referring to Figure 1 In the industrial lifting door 300, there are: track assembly 301, motor assembly 302, torsion spring balance system 303, door panel assembly 304, electrical control box 305. In addition, there are various devices known in the prior art, and their drawings and descriptions are omitted. In the track assembly 301, an anti-falling safety device A provided by the present application is installed.

[0028] Referring to Figure 2 As shown, the anti-falling safety device A and the guide rail pulley assembly 401 are installed on the industrial lifting door 300, and the industrial lifting door 300 is lifted through the guide rail 301.

[0029] Referring to Figure 3 As shown, the anti-falling safety device A provided by the present application mainly has: two pairs of cam systems 100, and a bracket 110 for installing the cam system, a steel wire rope 200 and a cam link above the cam system 100.

[0030] Referring to Fig. 4, the cam system 100 mainly includes: a cam 101, a sawtooth polyurethane rubber 102, a torsion spring 103, a cylindrical boss 104, a steel wire rope connecting column 105, a shaft 106, a cam 101, and a sawtooth polyurethane rubber 102 for braking. The torsion spring 103 fixes the cam 101 in the original position, one end of the torsion spring 103 is fixed on the long hole of the shaft 106, and the other end is fixed on the cylindrical boss 104 of the cam 101, and the steel wire rope connecting column 105 is connected with the steel wire rope 200.

[0031] Referring to Figure 5As shown, the anti-falling safety device is composed of two pairs of upper and lower cam systems 100. The motor power pulls up the industrial lifting door 300 through the steel wire rope 200, which pulls the upper and lower cams 101 to overcome the torsional spring 103 torque, and makes the upper and lower cams 101 rotate around the shaft 106 in the direction of the arrows shown in the figure through the connecting lever 109. When the upper and lower cams 101 rotate to a certain position, the limiting rod 107 and the limiting hole 108 are in contact, at which time the upper and lower cams 101 are in a non-contact state with the track 301, and the steel wire rope 200 passes through the anti-falling safety device to make the industrial door 300 freely ascend and descend.

[0032] Referring to Figure 6 As shown, when the steel wire rope 200 breaks, the tension on the steel wire rope connecting column 105 disappears, and the upper and lower cams 101 are respectively rotated around the shaft 106 in the direction of the arrows shown in the figure by the torsional spring 103 torque through the connecting lever 109, and the serrated polyurethane rubber 102 is pressed on the guide rail 301. At the moment of the door falling, due to the friction force F generated by the serrated polyurethane rubber 102 and the guide rail 301, the upper and lower cams 101 are rotated around the shaft 106 in the direction shown in the figure, and a positive pressure P is generated on the cam 101. The positive pressure P and the friction force F interact to generate a large friction force between the serrated polyurethane rubber 102 and the track 301, so that the industrial door stops falling and plays a braking role.

[0033] The anti-falling safety device provided by the present application can generate friction between the serrated polyurethane rubber 102 and the guide rail 301 and generate a positive pressure on the cam 101, which interacts to effectively play a braking role.

[0034] The above is only a preferred embodiment of the present application, and it should be noted that the above preferred embodiment should not be regarded as a limitation of the present application, and the protection scope of the present application should be limited by the scope defined by the claims. For ordinary skilled in the art, several improvements and refinements can be made without departing from the spirit and scope of the present application, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A fall arrest safety device in which the side edges of a gate slide up and down in a track via pulleys, characterised in that: The side of the door plate is also provided with a shaft, which is rotatably connected with the wheel body of the cam; the cam is two, the convex part of the cam is provided with a rubber layer with sawtooth-shaped surface, and the convex parts of the cams are mirror image arranged and respectively aligned with the inner walls of the two sides of the track; the two cams are linked through a connecting lever; The shaft is also provided with a torsional spring, the torsional force of which can drive the wheel body to rotate, so that the convex part of the cam is in contact with and locked by the inner wall of the track.

2. The fall arrest safety device of claim 1, wherein: The cam is provided with a connecting column, the steel wire rope for lifting the door plate is connected with the connecting column, and the pulling force of the steel wire rope drives the cam to rotate against the torsional force of the torsional spring, so that the convex part of the cam is not in contact with the inner wall of the track.

3. The fall arrest safety device of claim 1, wherein: One end of the torsional spring is fixed on the shaft long hole, and the other end is fixed on the cylindrical boss of the cam.

4. The fall arrest safety device of claim 1, wherein: The rubber layer is made of polyurethane rubber material.

5. The fall arrest safety device of claim 1, wherein: The sawtooth-shaped rubber and the convex part of the cam are provided with a spacing space.

6. The fall arrest safety device of claim 1, wherein: The wheel body of the cam is provided with a limiting hole, and a limiting rod is arranged in the limiting hole; the shape of the limiting hole corresponds to the rotating track.

7. The fall arrest safety device of claim 1, wherein: The two ends of the connecting lever are rotatably connected with the cylindrical bosses on the two cams respectively.

8. A lifting device for an industrial door comprising a track assembly, a motor assembly, a door panel assembly, and an electrical control box, characterized in that: A fall-preventing safety device is installed.

9. The industrial door lifting arrangement of claim 8, wherein: The fall-preventing safety devices are respectively installed on the left and right sides of the door plate, and provide pulling force through the steel wire rope and the motor.

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