Torsion spring with equal pitch cone, industrial door balancing mechanism and industrial lifting door

Abstract

The torsion spring of equal pitch cone, industrial door balancing mechanism and industrial lifting door, the torsion spring body is an equal pitch cone, and its two ends are respectively a pre-tightening end and a fixed end; the torsion spring and the flat tower wheel are arranged on the transmission shaft and coaxial therewith, wherein the steel wire rope wound by the flat tower wheel is connected to the door panel; the fixed end of the torsion spring is fixed on the base, and the pre-tightening end of the torsion spring is provided with a pre-tightening torque; when the torque is balanced with the weight of the door panel, the transmission shaft drives the flat tower wheel to rotate to lift the door panel. By making the pre-tightening torque of the equal pitch cone torsion spring consistent with the door weight, the automatic balance of the tensile force and the door weight when the lifting door is raised or lowered can be achieved.

Description

Technical Field

[0001] The invention relates to an industrial lifting door, in particular to an equal pitch cone torsion spring, an industrial door balancing mechanism and an industrial lifting door. Background Art

[0002] As logistics develops more and more rapidly, more and more warehouses use industrial lifting doors. At present, the balance system of industrial lifting doors on the market mainly relies on the cooperation of conical tower wheels and cylindrical torsion springs: when the lifting door is in a closed state, the cylindrical torsion spring maintains the maximum preload (torque); and as the door is lifted, the torsion spring torque gradually decreases. Since the weight of the lifted door remains unchanged, in order to make the torsion of the torsion spring and the door weight similar, a conical tower wheel with a gradually smaller diameter is used. Therefore, the lifting door requires different numbers of cylindrical torsion springs and different shapes of conical tower wheels according to the size of the door opening and the change of lifting method.

[0003] From a mechanical theoretical analysis, the above scheme shows that in order to keep the torque and door weight consistent, the taper curve of the tower wheel and the stiffness curve of the torsion spring must be consistent. However, the size of each industrial lifting door is different, so the number of torsion springs is different, and the corresponding tower wheel taper is also different, which will make the calculation of the two complicated, the cost is high, and the maintenance is inconvenient during use. Summary of the invention

[0004] The invention aims to solve the existing problems and provides a torsion spring with equal pitch cone, an industrial door balancing mechanism and an industrial lifting door.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention provides a torsion spring, including a torsion spring body, which is a cone with equal pitch, and its two ends are respectively a pre-tightening end and a fixed end; wherein, the fixed end fixes one end of the torsion spring body; the pre-tightening end at the other end of the torsion spring body is connected to the circumferential load, and can be rotated to generate a pre-tightening torque to balance the circumferential load.

[0006] Preferably, the torsion spring body of equal pitch is respectively composed of a cylindrical rear section and a conical front section, and the front end of the rear section is connected to the rear end of the front section; the front end of the front section is a pre-tightening end, and the rear end of the rear section is a fixed end. The present invention also provides an industrial door balancing mechanism, including the above-mentioned torsion spring, as well as a transmission shaft and a flat tower wheel, wherein the torsion spring and the flat tower wheel are arranged on the transmission shaft and coaxial therewith, wherein the steel wire rope wound by the flat tower wheel is connected to the door panel; the fixed end of the torsion spring is set to be fixed, and the pre-tightening end of the torsion spring is provided with a pre-tightening torque, which can drive the transmission shaft to rotate when the torque is released; when the torque is released and balanced with the gravity of the door panel, the transmission shaft is driven by the motor to rotate, and then the flat tower wheel is driven to rotate, so as to lift the door panel.

[0007] The torsion spring and flat step pulley are arranged on the transmission shaft and coaxial therewith, that is, the two ends of the transmission shaft extend from the two ends of the torsion spring and are respectively connected to the axis of the flat step pulleys on both sides; that is, a pair of flat step pulleys are respectively fixed to the two ends of the square tube by the door shaft fixing bracket and the fixing plate. The torsion spring is sleeved on the transmission shaft, and the axial directions of the two coincide.

[0008] The industrial door balancing mechanism is driven by a torsion spring with equal pitch cone. The overall structure of the torsion spring is as follows: the rear section is cylindrical and the front section is conical. The flange rear cover at one end of the cylinder is connected to the door shaft fixing bracket by bolts. When the torsion force of the torsion spring at the rear end decreases, the center diameter of the torsion spring also decreases. The torsion force of the equal pitch cone torsion spring or the motor is used to rotate the transmission shaft, which in turn drives the flat tower wheel to rotate. The steel wire rope wound on the flat tower wheel drives the door panel to move up and down.

[0009] Preferably, it also includes a flange front end cover, the pre-tightening end of the torsion spring is fixed on the flange front end cover, the transmission shaft passes through the center of the flange front end cover and is connected, and can drive the flange front end cover and the pre-tightening end of the torsion spring to rotate together.

[0010] Preferably, it also includes a fixedly arranged flange rear end cover, and the fixed end of the torsion spring is fixed on the flange rear end cover.

[0011] Preferably, the rear end cover of the flange is fixed on a door shaft fixing bracket.

[0012] Preferably, a bayonet is provided on the rear end cover of the flange, and the bent portion of the fixed end of the torsion spring is snapped into the bayonet, so that the rear end cover of the flange is tightly matched with the torsion spring to achieve fixation of the rear end cover of the flange.

[0013] Preferably, the transmission shaft passes through the center of the rear end cover of the flange and is relatively rotatable.

[0014] Preferably, the tower wheel is a flat tower wheel; the flat tower wheel is used in conjunction with an equal-pitch conical torsion spring, and the tower wheel structure is no longer replaced according to the lifting method.

[0015] Preferably, the transmission shaft is a hexagonal transmission shaft; the motor drives the hexagonal transmission shaft to rotate, and no flat key is required between the hexagonal transmission shaft and the equal-pitch conical torsion spring and the flat step pulley, thereby improving transmission efficiency and reducing wear.

[0016] Preferably, it further comprises a plurality of door shaft fixing brackets, and the transmission shaft passes through the plurality of door shaft fixing brackets in sequence and can rotate relatively.

[0017] Preferably, the lower ends of the plurality of door shaft fixing brackets are fixed on the upper end surface of the square tube; the door shaft fixing brackets and the fixing plate are connected by bolts; the side plate and the square tube are connected by a square tube side plate connector. The present invention also provides an industrial lifting door, including a door panel, including any of the industrial door balancing mechanisms. Preferably, a motor assembly is also provided, including a motor, and the motor cooperates with a torsion spring to provide a force that is balanced with the door panel, so that the door panel can move up and down.

[0018] Preferably, a track assembly is further provided, including a pulley and a track. Pulleys are installed on both sides of the door panel, and the pulleys roll in the track.

[0019] Compared with the prior art, the torsion spring of the present invention changes in an equal pitch cone shape, with a large diameter at the rear end gradually decreasing to a small diameter at the front end, and then gradually transitioning to a cylindrical shape. When the tightened torsion spring is released, the torsion spring diameter changes from large to small, so that the torsion characteristic line maintains a nearly linear change, that is, the lifting force converted from the torsion of the torsion spring and the weight of the industrial lifting door remain in a relatively constant range. This solves the problem that in the prior art, a cylindrical torsion spring is usually used in conjunction with a tower wheel with a changing diameter to maintain a certain lifting force, resulting in high costs and complex maintenance.

[0020] The industrial door balancing mechanism enables the industrial lifting door to maintain the balance between the door weight and the torsion spring torque during the lifting process. The function of the industrial door balancing mechanism is that when the industrial door is stopped at any position, the operator only needs to push and pull the door body by hand, and the torsion spring balancing system can realize the automatic lifting of the industrial door with a small amount of force. The industrial lifting door is equipped with an industrial door balancing mechanism, which has a simple structure and low cost. By making the pre-tightening torque of the torsion spring of the equal pitch cone consistent with the door weight, the tensile force and the door weight can be automatically balanced when the lifting door is lifted or lowered. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an equal pitch conical torsion spring balancing mechanism;

[0022] Figure 2 It is a structural schematic diagram of an equal pitch conical torsion spring balancing mechanism;

[0023] Figure 3 It is a structural schematic diagram of an equal pitch conical torsion spring;

[0024] Figure 4 It is a structural schematic diagram of a flat tower wheel;

[0025] Figure 5 It is a structural schematic diagram of the conical preload end of the equal pitch conical torsion spring;

[0026] Figure 6 It is a structural schematic diagram of the fixed end of the equal pitch conical torsion spring;

[0027] Figure 7This is a structural diagram of an industrial lifting door. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] The core of this embodiment is to provide an industrial door balancing mechanism with equal pitch conical torsion springs (i.e., equal pitch conical torsion spring balancing mechanism 201), which has the characteristic of maintaining an approximately linear lifting force as the torsion spring torque changes. The core of another embodiment of the present invention is to provide an industrial lifting door using the equal pitch conical torsion spring balancing mechanism of the present invention, which has the characteristics of simple structure and easy maintenance.

[0030] See also Figure 1 The equal pitch conical torsion spring balancing mechanism 201 is composed of a flat tower wheel 101, an equal pitch conical torsion spring 103, a hexagonal transmission shaft 102, a door shaft fixing bracket 104, a fixing plate 105 and a side plate 108, a square tube 106, and a square tube side plate connecting piece 107.

[0031] See also Figure 2 A pair of flat step wheels 101 and an equal pitch conical torsion spring 103 are installed on the hexagonal transmission shaft 102 and are coaxial therewith, and a door shaft fixing bracket 104 fixes the hexagonal transmission shaft 102 and the parts installed on the hexagonal transmission shaft 102 on the square tube 106.

[0032] In this embodiment, the door shaft fixing bracket 104, the equal pitch conical torsion spring 103 and the center part of the flat step wheel 101 are preferably hexagonal structures. Therefore, after cooperating with the hexagonal transmission shaft 102, the motor drives the hexagonal transmission shaft 102 to rotate, and a flat key is no longer required between the hexagonal transmission shaft 102 and the equal pitch conical torsion spring 103 and the flat step wheel 101, thereby improving the transmission efficiency and reducing wear.

[0033] The equal pitch conical torsion spring 103 of this embodiment drives the equal pitch conical torsion spring balancing mechanism 201. Due to the combination of the equal pitch conical torsion spring 103 and the flat step pulley 101, compared with the conventional cylindrical torsion spring and different types of step pulley combinations, it is simpler and easier to calculate, and is convenient to maintain and easy to operate. The step pulley no longer needs to be replaced with different structures according to the lifting method. When the torque of the equal pitch conical torsion spring decreases, its center diameter also decreases accordingly.

[0034] See also Figure 3 , is a schematic structural diagram of the front side of the equal pitch conical torsion spring 103. A flange rear end cover 113 is installed on the left side of the equal pitch conical torsion spring 103, and a flange front end cover 123 is installed on the right side thereof.

[0035] See also Figure 4A groove for winding a steel wire rope 101 a is formed on the flat tower wheel 101 . One end of the steel wire rope 101 a is connected to an industrial lifting door (not shown in the figure), and the other end is fixed to the flat tower wheel 101 .

[0036] See also Figure 5 , is a structural diagram of the conical pre-tightening end of the equal-pitch conical torsion spring. The hexagonal transmission shaft 102 is fixed to the door shaft fixing bracket 104 through the bearing 104a, and passes through the equal-pitch conical torsion spring 103. The equal-pitch conical torsion spring 103 is fixed to the front end cover 123 of the flange. The center of the front end cover 123 of the flange is a circular hole, so that the equal-pitch conical torsion spring 103 and the front end cover 123 of the flange can rotate together with the hexagonal transmission shaft 102.

[0037] When the hexagonal transmission shaft 102 rotates, it drives the flange front end cover 123 to rotate together, and then drives the equal pitch conical torsion spring 103 to rotate and tighten to generate preload; or when the preload is released to lift the door panel assembly 202, the equal pitch conical torsion spring 103 rotates, drives the flange front end cover 123 to rotate together, makes the hexagonal transmission shaft 102 rotate, and then drives the flat tower wheel 101 to rotate, and the wire rope 101a pulls the door panel assembly upward. That is, the initial preload of the torsion spring is set by rotating the equal pitch conical torsion spring 103 and the flange front end cover 123, and the equal pitch conical torsion spring 103 and the flange front end cover 123 are fixed on the hexagonal transmission shaft 102 by two screws 123a, and finally balance with the gravity of the lifting door panel assembly 202.

[0038] See also Figure 6 , is a schematic diagram of the structure of the fixed end of the equal pitch conical torsion spring, and the equal pitch conical torsion spring 103 is fixed on the rear end cover 113 of the flange. Preferably, there is also a square bayonet on the side of the rear end cover 113 of the flange, and the bent part of the equal pitch conical torsion spring 103 can be snapped into the bayonet, so that the rear end cover 113 of the flange is tightly matched with the equal pitch conical torsion spring 103, so as to fix the rear end cover 113 of the flange, and prevent the torsion spring from rotating as a whole with the hexagonal transmission shaft 102 when the front end of the equal pitch conical torsion spring 103 rotates. In addition, the equal pitch conical torsion spring 103 and the rear end cover 113 of the flange are fixed to the door shaft fixing bracket 104 by two screws 113a, and the hexagonal transmission shaft 102 passes through the equal pitch conical torsion spring 103 and the rear end cover 113 of the flange through the bearing 104a.

[0039] In addition to the equal pitch conical torsion spring balancing mechanism, the present invention also provides an industrial lifting door using the equal pitch conical torsion spring balancing mechanism. Figure 7 , which is a structural schematic diagram of a specific embodiment of the industrial lifting door provided by the present invention, that is, an industrial lifting door 300, specifically comprising: a track assembly 200, a door panel assembly 202, an equal-pitch conical torsion spring balancing mechanism 201, a motor assembly 204, and a control box assembly 203.

[0040] Pulleys are installed on both sides of the door panel assembly 202, and the pulleys roll in the track to make the door panel assembly 202 move up and down; the track assembly 200 provides a track and a track guard plate to guide the door panel to move up and down; the equal pitch conical torsion spring balancing mechanism 201 includes an equal pitch conical torsion spring 103 and a flat tower wheel 101 to drive the operation of the industrial lifting door; the motor in the motor assembly 204 cooperates with the equal pitch conical torsion spring 103 to provide a force that balances the door panel assembly 202, so that the door panel assembly 202 can move up and down; the control box assembly 203 is used to control the movement state of the entire door. The control box assembly 203 and the motor assembly 204 are on the same side of the industrial lifting door 300; when the two are not on the same side, the wire needs to be lengthened.

[0041] During installation, a preload force is applied to the equal pitch conical torsion spring 103 according to the weight of the door panel assembly 202. When the control box assembly 203 is used to start the vertical lifting industrial lifting door 300, the equal pitch conical torsion spring 103 drives the hexagonal transmission shaft 102 to rotate through its own torque, so the flat tower wheel 101 will start to rotate accordingly. At this time, the wire rope wound on the flat tower wheel 101 lifts the door panel assembly 202 upward. When the weight of the door panel assembly 202 and the torque of the equal pitch conical torsion spring 103 reach a balance, the motor in the motor assembly 204 starts, drives the hexagonal transmission shaft 102 to start rotating, and then drives the flat tower wheel 101 to rotate, so that the door panel assembly 202 continues to be lifted upward to the highest point.

[0042] In the equal pitch conical torsion spring balancing system and industrial lifting door in this embodiment, the equal pitch conical torsion spring 103 is connected to the flat tower wheel 101 through a hexagonal transmission shaft 102, the door shaft fixing bracket 104 fixes the hexagonal transmission shaft 102 on the square tube 106, and the motor is fixed to the side end of the square tube 106 by the door shaft fixing bracket 104. The weight of the door panel assembly 202 provides pre-tightening force to the equal pitch conical torsion spring 103. When the weight of the door panel assembly 202 and the torque of the equal pitch conical torsion spring 103 reach a balance, the motor drives the hexagonal transmission shaft 102 to rotate, and the flat tower wheel 101 on the hexagonal transmission shaft 102 rotates accordingly, and the steel wire rope 101a wound on the flat tower wheel 101 pulls the door panel to continue to move upward. Pulleys are installed on both sides of the door panel, and the pulleys can roll in the track. The door panel assembly 202 moves up and down in the track through the pulleys.

[0043] By using the equal pitch conical torsion spring 103 in conjunction with the flat tower wheel 101 and the motor, when the torque is reduced, the center diameter of the equal pitch conical torsion spring 103 is reduced, so that the torque of the equal pitch conical torsion spring 103 is balanced with the weight of the door panel assembly 202. When the power is off or the emergency button is pressed, the motor will no longer work, and the operator will pull the manual release device to open the industrial lifting door to avoid personal accidents.

[0044] The number of torsion springs and the type of tower wheel in this embodiment are no longer limited by the size of the door opening, avoiding problems such as complex calculations and inconvenient maintenance. The coordination of the equal pitch conical torsion spring 103 and the flat tower wheel 101, during operation, the center diameter of the equal pitch conical torsion spring 103 changes, and its torque also changes accordingly, so that the weight and torque of the door panel assembly 202 are balanced. The tower wheel uses the flat tower wheel 101, and there is no need to select different types of tower wheels according to the door panel lifting method. Compared with the cylindrical torsion spring system currently used in the market, it has the characteristics of simple structure, convenient maintenance, and easy operation.

[0045] In addition, there are other various devices known in the prior art, and their illustrations and descriptions are omitted. Please refer to the prior art, and this article will not repeat them.

[0046] The above are only preferred embodiments of the present invention, which should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A torsion spring, characterized in that: It includes a torsion spring body, which is a cone with equal pitch, and its two ends are a pre-tightening end and a fixed end respectively; wherein the fixed end fixes one end of the torsion spring body; the pre-tightening end at the other end of the torsion spring body is connected to the circumferential load, and can be rotated to generate a pre-tightening torque to balance the circumferential load; the torsion spring body with equal pitch is respectively composed of a cylindrical rear section and a conical front section, and the front end of the rear section is connected to the rear end of the front section; the front end of the front section is the pre-tightening end, and the rear end of the rear section is the fixed end.

2. An industrial door balancing mechanism, characterized in that: It includes the torsion spring as described in claim 1, and a transmission shaft and a flat tower wheel, wherein the torsion spring and the flat tower wheel are arranged on the transmission shaft and are coaxial therewith, wherein the steel wire rope wound around the flat tower wheel is connected to the door panel; the fixed end of the torsion spring is set to be fixed, and the pre-tightening end of the torsion spring is provided with a pre-tightening torque, which can drive the transmission shaft to rotate when the torque is released; when the torque is released and balanced with the gravity of the door panel, the transmission shaft is driven by the motor to rotate, and then the flat tower wheel is driven to rotate, so as to lift the door panel.

3. The industrial door balancing mechanism according to claim 2, characterized in that: The two ends of the transmission shaft body extend from the two ends of the torsion spring and are respectively connected to the axles of the flat step wheels on both sides.

4. The industrial door balancing mechanism according to claim 2, characterized in that: It also includes a flange front end cover, the pre-tightening end of the torsion spring is fixed on the flange front end cover, the transmission shaft passes through the center of the flange front end cover and is connected, and can drive the flange front end cover and the pre-tightening end of the torsion spring to rotate together.

5. The industrial door balancing mechanism according to claim 2, characterized in that: It also includes a fixedly arranged flange rear end cover, and the fixed end of the torsion spring is fixed on the flange rear end cover.

6. The industrial door balancing mechanism according to claim 5, characterized in that: The rear end cover of the flange is fixed on the door shaft fixing bracket.

7. The industrial door balancing mechanism according to claim 5, characterized in that: A bayonet is provided on the rear end cover of the flange, and the bent portion of the fixed end of the torsion spring is clamped into the bayonet, so that the rear end cover of the flange is tightly matched with the torsion spring to achieve the fixing of the rear end cover of the flange.

8. The industrial door balancing mechanism according to any one of claims 5 to 7, characterized in that: The transmission shaft passes through the center of the rear end cover of the flange and can rotate relatively.

9. The industrial door balancing mechanism according to any one of claims 2 to 7, characterized in that: The transmission shaft is a hexagonal transmission shaft.

10. The industrial door balancing mechanism according to any one of claims 2 to 7, characterized in that: It also includes a plurality of door shaft fixing brackets, and the transmission shaft passes through the plurality of door shaft fixing brackets in sequence and can rotate relatively.

11. The industrial door balancing mechanism according to claim 10, characterized in that: The lower ends of the plurality of door shaft fixing brackets are fixed on the upper end surface of the square tube.

12. An industrial lifting door, comprising a door panel, characterized in that: The industrial door balancing mechanism comprises the industrial door balancing mechanism described in any one of claims 2 to 11.

13. The industrial lifting door according to claim 12, characterized in that: A motor assembly is also provided, comprising a motor, wherein the motor cooperates with a torsion spring to provide a force that is balanced with the door panel, so that the door panel can move up and down.

14. The industrial lifting door according to claim 12, characterized in that: A track assembly is also provided, comprising a pulley and a track. Pulleys are installed on both sides of the door panel, and the pulleys roll in the track.

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