Torsion spring break protection device, lifting equipment and industrial door

Abstract

A torsion spring break protection device, lifting equipment and industrial door, wherein the torsion spring is driven to rotate by a coaxial transmission shaft, a gear and a rack that can rotate around a fulcrum are fixed on the transmission shaft, and a through oblong hole is provided on the rack; a driving pin is provided at one end of the torsion spring, and the driving pin passes through the guide hole and is inserted into the oblong hole; when the torsion spring breaks, its torque disappears, and the driving pin moves in the opposite direction along the guide hole to rotate the rack, so that the rack meshes with the gear, causing the transmission shaft to stop rotating. The present invention forms a self-locking device through gears, racks and springs, and when the torsion spring breaks, the driving pin at the end of the torsion spring cooperates with the spring tension to lock the rack to the gear on the power shaft, thereby achieving braking and preventing the load / lifting door from falling, and has the characteristics of simple structure, low cost and convenient maintenance.

Description

Technical Field

[0001] The invention relates to a mechanical safety device, in particular to a torsion spring break protection device, a lifting device and an industrial door. Background Art

[0002] With the rapid development of the logistics industry, industrial lifting doors are also widely used in logistics warehouses and other places. Industrial lifting doors are generally driven by motors or torsion springs, including track components, door panel components, drum components, control box components, wire ropes, and manual release devices. In the balanced lifting door system, the tightened torsion spring usually drives the drum through the wire rope to enable the industrial lifting door to slide up and down along the guide rail to open and close the door. During operation, if there is no anti-fall safety device, once the torsion spring breaks, it will cause the lifting door to fall quickly, which will not only damage the equipment, but also pose a great safety hazard. The currently commonly used anti-fall devices usually adopt structures such as worm gear self-locking, which have many problems such as high cost and complex maintenance. Summary of the invention

[0003] The present invention aims to solve the existing problems and provide a torsion spring break protection device, a lifting device and an industrial door.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is that the torsion spring is driven to rotate by a coaxial transmission shaft, and is characterized in that: a gear that rotates with the transmission shaft and a rack that can rotate around a fulcrum are also fixed on the transmission shaft, and a through oblong hole is provided on the rack; a driving pin is provided at one end of the torsion spring, and the driving pin passes through the guide hole and is inserted into the oblong hole;

[0005] When the torsion spring is not broken, its torque can rotate the driving pin to the end of the guide hole, causing the rack and gear to break contact; when the torsion spring breaks, its torque disappears, the driving pin moves in the opposite direction along the guide hole and rotates the rack, causing the rack and gear to mesh, causing the transmission shaft to stop rotating.

[0006] Preferably, one end of the rack forms a fulcrum with the positioning pin through the circular hole, and forms a rotatable connection.

[0007] Preferably, there are two racks, which are arranged on both sides of the gear. One end of the two racks is connected by a compression spring, and the other end is connected by a tension spring.

[0008] Preferably, one end of the torsion spring is connected to a movable flange, and a driving pin is provided on the movable flange.

[0009] Preferably, the transmission shaft is connected to the other end of the torsion spring via a fixing flange, and the fixing flange drives the torsion spring to rotate.

[0010] Preferably, one end of the torsion spring is further provided with an anti-dislocation floating screw, and the floating screw is inserted into another guide hole, and the diameter of the end portion thereof is greater than the width of the guide hole.

[0011] Preferably, it further comprises a bracket, on which a positioning pin is provided, and the positioning pin is rotatably connected to the circular hole on the rack.

[0012] Preferably, it further comprises a plurality of guide holes, wherein the guide holes are arranged along the rotation track of the torsion spring end, and the driving pin or the floating screw can move along the guide holes.

[0013] Preferably, the frame body of the bracket is rotatably connected to the transmission shaft via a bearing.

[0014] The present invention also provides a lifting device, comprising the above-mentioned torsion spring breakage protection device.

[0015] The present invention also provides an industrial door, comprising the above-mentioned torsion spring fracture protection device.

[0016] Compared with the prior art, the present invention forms a self-locking device through gears, racks and springs. When the torsion spring breaks, the driving pin at the end of the torsion spring cooperates with the spring tension to lock the rack to the gear on the power shaft, thereby achieving braking and preventing the load / lifting door from falling. The present invention has the characteristics of simple structure, low cost and easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure after the driving gear is meshed with the left variable rack and the right rack;

[0018] Figure 2 It is a structural schematic diagram of one end of a torsion spring assembly;

[0019] Figure 3 is a schematic diagram of the structure of the other end of the torsion spring assembly;

[0020] Figure 4 Schematic diagram of the structure of the torsion spring assembly and the metal bracket assembly;

[0021] Figure 5 It is a structural schematic diagram of a torsion spring fracture protection device;

[0022] Figure 6 This is the state diagram when the torsion spring break protection device is not actuated;

[0023] Figure 7 This is the state diagram of the torsion spring break protection device when it is in action;

[0024] Figure 8 It is a structural diagram of industrial lifting equipment;

[0025] Fig. 9 This is a structural diagram of an industrial door;

[0026] See the attached drawings, 100 torsion spring break protection assembly, 101 left rack, 102 tension spring, 103 right rack, 104 compression spring, 105 driving gear; 200 metal bracket assembly, 202 bearing assembly, 203 guide hole, 204 positioning pin, 205 floating screw; 300 torsion spring assembly, 301 fixed flange, 302 driving pin, 305 movable flange; 400 hexagonal transmission shaft; 600 lifting door equipment, 601 track assembly, 602 motor assembly, 603 torsion spring balancing system, 603a steel wire rope, 603b weight, 604 door panel assembly, 605 electrical control box. DETAILED DESCRIPTION

[0027] To further illustrate a fall prevention safety device provided by the present invention, a further detailed description is given below in conjunction with the illustrations of the preferred embodiments of the present invention.

[0028] See also Figures 1 to 3 , Figures 1 to 3 What is shown is an embodiment of the present invention, which mainly includes a left rack 101, a tension spring 102, a right rack 103, a compression spring 104, a driving gear 105, etc. The torsion spring assembly 300 is driven to rotate by a coaxial transmission shaft passing through the inside thereof, and the hexagonal transmission shaft 400 is selected as the transmission shaft in this embodiment. The hexagonal transmission shaft 400 is also fixed with a driving gear 105 that can rotate with it, and the axis of the wheel body of the driving gear 105 is vertically connected to the axis body of the hexagonal transmission shaft 400; and the left rack 101 and the right rack 103 that can rotate around the fulcrum, and the left rack 101 and the right rack 103 are respectively provided with a through long strip-shaped oblong hole, and the two ends thereof are arcs, which are used to drive the pin 302 to move in the hole and to turn it to rotate. Furthermore, the oblong hole of the left rack 101 is arranged in its upper section, and the oblong hole of the right rack 103 is arranged in its lower section.

[0029] See also Figure 4 Four guide holes 203 are provided on the metal bracket assembly 200. The openings of the guide holes 203 are arranged along the rotation trajectory (circle) of the end of the torsion spring assembly 300, that is, they are in a corresponding arc shape. The guide holes 203 are arranged symmetrically around the axis of the rotation trajectory. Two driving pins 302 inserted therein can move along the trajectory of the guide holes 203, and their positions correspond to the oblong hole in the upper section of the left rack 101 and the oblong hole in the lower section of the right rack 103, respectively.

[0030] Further, see Figure 4Two driving pins 302 are installed on the movable flange of the torsion spring assembly 300, and there are four guide holes 203 on the metal bracket assembly 200. The two driving pins 302 pass through two of the guide holes 203. The other two guide holes 203 are connected to the movable flange and the metal bracket assembly 200 by floating screws 205. The diameter of the end of the floating screw 205 is larger than the width of the guide hole 203, and it can move in the guide hole 203 to prevent dislocation. Two positioning pins 204 are installed at the lower end of the metal bracket.

[0031] In addition, the metal bracket assembly 200 is rotatably connected to the hexagonal transmission shaft 400 passing through the frame body thereof via the bearing assembly 202 , and the hexagonal transmission shaft 400 is driven to rotate by an external power.

[0032] Furthermore, the lower ends of the left rack 101 and the right rack 103 respectively form a fulcrum with the positioning pin 204 through a circular hole and form a rotatable connection. Figure 6 and Figure 7 That is, the left rack 101 and the right rack 103 can rotate around the fulcrum to separate from the driving gear 105 (in the direction of arrows B1 and C1), or to approach the driving gear 105 (in the direction of arrows B2 and C2).

[0033] See also Figure 1 , the lower ends of the left rack 101 and the right rack 103 are connected by the compression spring 104, and the upper ends of the two are connected by the tension spring 102. After the connection, under the action of the initial torque of the torsion spring assembly 300, the driving pin 302 is rotated to the end of the guide hole 203, so that the left rack 101 and the right rack 103 overcome the tension of the tension spring 102 and the pressure of the compression spring 104 and rotate and open to both sides, and the left rack 101, the right rack 103 and the driving gear 105 are in a separated state of disengagement, and the torque balance is maintained, and the driving gear 105 can rotate, and the equipment operates normally at this time. Therefore, when the torsion spring assembly 300 does not have a break accident, the torque of the torsion spring assembly 300 can rotate the driving pin 302 to the end of the guide hole, so that the rack and the gear are out of contact.

[0034] When the torsion force of the torsion spring assembly 300 disappears, the driving pin 302 no longer has torsion support and moves in the opposite direction along the guide hole 203, so that the left rack 101 and the right rack 103 rotate inward under the tension of the tension spring 102 and the pressure of the compression spring 104, and the left rack 101 and the right rack 103 mesh with the driving gear 105, and the driving gear 105 is locked. That is, when the torsion spring assembly 300 breaks, its torsion force disappears, and the driving pin 302 moves in the opposite direction along the guide hole 203 to rotate the rack, so that the rack meshes with the driving gear 105, and finally the hexagonal transmission shaft 400 stops rotating.

[0035] As a preference, see Figure 2 A movable flange is installed at one end of the torsion spring assembly 300, and a notch is opened on the movable flange. The bent portion of the front section of the torsion spring is inserted into the notch of the movable flange to ensure that the movable flange can be driven to rotate when the torsion spring is twisted. A driving pin is provided on the end surface of the movable flange, and the driving pin 302 can pass through the guide hole 203 and be inserted into the oblong hole.

[0036] See also Figure 3 The fixed flange is fixed together with the hexagonal transmission shaft 400 through a flat key, and the other end of the fixed flange and the torsion spring assembly 300 are fixed. When the hexagonal transmission shaft 400 rotates, the fixed flange and the torsion spring can be driven to rotate simultaneously.

[0037] See also Figure 5 and Figure 6 , is a state diagram when the torsion spring fracture protection device is not actuated. In the initial state, the torsion spring assembly 300 is twisted to keep a certain initial torque of the torsion spring. At this time, the movable flange rotates in the direction of arrow A1 (counterclockwise) in the figure until the driving pin 302 on the floating flange turns to the vertex position of the oblong hole. As the driving pin 302 moves in the oblong holes of the left rack 101 and the right rack 103, the left rack 101 and the right rack 103 rotate around the positioning pin 204 in directions C1 and B1 (i.e., from inside to outside), respectively. The left rack 101 and the right rack 103 overcome the tension of the tension spring 102 and the pressure of the compression spring 104, so that the left rack 101 and the right rack 103 are out of contact with the driving gear 105. At this time, the driving gear 105 and the hexagonal transmission shaft 400 can rotate simultaneously.

[0038] See also Figure 5 and Figure 7 , is a state diagram of the torsion spring break protection device in operation. If the torsion spring assembly 300 breaks or has other faults, the initial torque of the torsion spring assembly 300 will disappear, and the tension of the extension spring 102 and the pressure of the compression spring 104 will cause the left rack 101 and the right rack 103 to rotate in opposite directions around the positioning pin 204 in the directions C2 and B2 (i.e., from the outside to the inside) in the figure, respectively, driving the movable flange to rotate in the direction A2 (clockwise). At this time, the left rack 101, the right rack 103 and the two sides of the driving gear 105 are respectively meshed, the driving gear 105 stops rotating, and the hexagonal transmission shaft 400 is locked with it and cannot continue to rotate, effectively preventing the load / lifting door from falling and avoiding safety accidents.

[0039] See also Figure 8The embodiment of the present invention also provides an industrial lifting device, including a torsion spring balancing system 603, with two steel wire ropes 603a and a weight 603b installed on the left and right drums. Under the action of the torsion spring torsion, the driving gear 105 and the hexagonal transmission shaft 400 can rotate at the same time, driving the weight to rise; if the torsion spring breaks, the racks 101, 103 and the driving gear 105 are meshed, the driving gear 105 and the hexagonal transmission shaft 400 are locked and cannot rotate, and the weight 603b is fixed.

[0040] See also Fig. 9 The embodiment of the present invention also provides an industrial lifting door, which includes a track assembly 601, a motor assembly 602, a torsion spring balance system 603, a door panel assembly 604 and an electrical control box 605. In addition, there are various other devices known in the prior art, and their illustrations and descriptions are omitted. A torsion spring break protection device provided by the present invention is installed in the torsion spring balance system 603.

[0041] The above describes the implementation mode of the present invention in combination with the drawings and embodiments. The structure given in the embodiments does not constitute a limitation of the present invention. Those skilled in the art can make adjustments as needed. Various deformations or modifications within the scope of the attached claims are within the scope of protection.

Claims

1. A torsion spring fracture protection device, wherein the torsion spring is driven to rotate by a coaxial transmission shaft, characterized in that: The transmission shaft is also fixed with a gear that rotates with it, and a rack that can rotate around a fulcrum, and an oblong hole is provided on the rack; two positioning pins and four guide holes are installed at the lower end of the bracket, and the openings of the guide holes are arranged along the rotation trajectory of the torsion spring end, and are corresponding arcs; the guide holes are arranged symmetrically around the axis of the rotation trajectory; A driving pin is provided at one end of the torsion spring, and the driving pin passes through the guide hole and is inserted into the oblong hole; The torsion force of the torsion spring can rotate the driving pin to the end of the guide hole, so that the rack and the gear are out of contact; when the torsion spring breaks, its torsion force disappears, and the driving pin moves in the opposite direction along the guide hole to rotate the rack, so that the rack and the gear are meshed, causing the transmission shaft to stop rotating; One end of the rack forms a fulcrum with the positioning pin through a circular hole and forms a rotatable connection; the rack is two and is arranged on both sides of the gear. One end of the two racks is connected by a compression spring and the other end is connected by a tension spring; One end of the torsion spring is connected to a movable flange, and two driving pins are provided on the movable flange; The transmission shaft is connected to the other end of the torsion spring through a fixed flange, and the fixed flange drives the torsion spring to rotate; Two driving pins are inserted into two guide holes. The two driving pins can move along the tracks of the guide holes, and their positions correspond to the oblong holes in the upper section of the left rack and the oblong holes in the lower section of the right rack respectively; the bracket is also rotatably connected with the transmission shaft passing through its frame through a bearing.

2. The torsion spring fracture protection device according to claim 1, characterized in that: Two floating screws are arranged on the movable flange connected to one end of the torsion spring, and the movable flange and the bracket are connected by floating screws at the other two guide holes. The diameter of the end of the floating screw is larger than the width of the guide hole and can move in the guide hole to prevent dislocation.

3. A lifting device, characterized in that: It includes the torsion spring fracture protection device as claimed in claim 1 or 2.

4. An industrial door, characterized in that: It includes the torsion spring fracture protection device as claimed in claim 1 or 2.

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