Torque self-adaption device for steel plate elevator

Abstract

The utility model discloses a torque self-adaptive device for a steel plate elevator, which comprises a driving mechanism, torque limiters are symmetrically connected to two sides of the driving mechanism, and clamping mechanisms are connected to the bottoms of the torque limiters. By arranging the torque limiter, the torque between the two sets of clamping mechanisms is adaptively adjusted, so that the clamp arms on the two sides for lifting the steel plates can be adaptively adjusted according to different widths of the steel plates, the application range of the steel plate elevator is expanded, and the steel plate elevator can better adapt to lifting operation of the steel plates with different widths.

Description

Technical Field

[0001] The utility model relates to the field of lifting equipment, in particular to a torque self-adapting device for a steel plate hoist. Background Art

[0002] With the development of industrial automation, various electric steel plate hoists are used in the field of steel plate lifting and handling. The working principle of the steel plate hoist is to drive the clamp arms on both sides of the hoist to open and close through the motor, so as to grab or put down the steel plate through the opening and closing of the clamp arms. Since the steel plate to be hoisted is generally 12 meters long, the clamp arm length is generally about 5 meters, and two sets of clamping mechanisms need to be set on the clamp arm. The use of steel plate hoists has greatly improved the efficiency of steel plate lifting and handling operations. Compared with the traditional old-fashioned mechanical hoists and manually assisted lifting operations, its safety is also guaranteed. However, the existing steel plate hoists have the following problems when in use: (1) The clamping mechanism of the electric steel plate hoist is opened and closed synchronously, and there is no torque control system, which causes the clamp arms on both sides to always be parallel to each other. Only square steel plates can be lifted. If it is necessary to lift trapezoidal or irregular shaped steel plates, that is, steel plates with a smaller width at one end and a larger width at the other end, it is easy for the clamp arm on the wider side to clamp the steel plate, while there is still a certain distance between the clamp arm on the smaller side and the edge of the steel plate, resulting in the clamp arms on both sides being unable to effectively clamp the steel plate, resulting in the hoist lifting steel plates being limited. Utility Model Content

[0003] The utility model provides a torque adaptive device for a steel plate hoist, aiming to solve the problem that the existing hoist cannot safely and effectively clamp steel plates of different widths, resulting in a limited hoisting operation range of the steel plate hoist.

[0004] To achieve its purpose, the utility model adopts the following technical solutions:

[0005] A torque adaptive device for a steel plate hoist comprises a driving mechanism, wherein torque limiters are symmetrically connected to both sides of the driving mechanism, and a clamping mechanism is connected to the bottom of the torque limiter.

[0006] Preferably, the driving mechanism comprises an electric motor, an output shaft of the electric motor is provided with a driving sprocket, the driving sprocket is connected to a passive sprocket via a chain, a transmission shaft runs through the passive sprocket, and torque limiters are symmetrically provided at both ends of the transmission shaft.

[0007] Preferably, the torque limiter includes a gear shaft, a passive bevel gear is provided on the gear shaft, a transmission bevel gear is provided on the transmission shaft, and the transmission bevel gear is meshed with the passive bevel gear; friction plates are fixed on the top and bottom friction surfaces of the passive bevel gear through a pressure plate and a chassis respectively, and a butterfly spring is provided at the bottom of the chassis.

[0008] Preferably, an internal thread is provided on the inner hole of the pressure plate, and the pressure plate engages with the upper thread of the gear shaft.

[0009] Preferably, the clamping mechanism comprises a first rack and a second rack which are symmetrically arranged, the first rack and the second rack are both meshed with the passive bevel gear, the free end of the first rack is connected to the first clamp arm, and the free end of the second rack is connected to the second clamp arm.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0011] The steel plate elevator provided by the utility model is provided with a torque limiter, which adaptively adjusts the torque between the two sets of clamping mechanisms, so that the clamp arms on both sides of the steel plate lifting can be adaptively adjusted according to the different widths of the steel plates, thereby expanding the application scope of the steel plate elevator and enabling the steel plate elevator to better adapt to the lifting operations of steel plates of various different widths. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic structural diagram of a torque adaptive device for a steel plate hoist of the utility model;

[0013] Figure 2 for Figure 1 Left side view of the middle clamping mechanism;

[0014] Figure 3 This is a schematic diagram of the structure of the torque limiter of the utility model;

[0015] In the figure: 1-driving mechanism; 1.1-electric motor; 1.2-driving sprocket; 1.3-passive sprocket; 1.4-transmission shaft; 2-torque limiter; 2.1-transmission bevel gear; 2.2-passive bevel gear; 2.3-pressure plate; 2.4-friction plate; 2.5-chassis; 2.6-butterfly spring; 2.7-gear shaft; 3-clamping mechanism; 3.1-first rack; 3.2-second rack; 3.3-second clamp arm; 3.4-first clamp arm. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings:

[0017] like Figure 1-3 As shown, the utility model is a torque adaptive device for a steel plate hoist, comprising a driving mechanism 1, wherein torque limiters 2 are symmetrically connected to both sides of the driving mechanism 1, and a clamping mechanism 3 is connected to the bottom of the torque limiter 2.

[0018] The driving mechanism 1 comprises an electric motor 1.1, on the output shaft of which a driving sprocket 1.2 is provided, the driving sprocket 1.2 is connected to a driven sprocket 1.3 through a chain, a transmission shaft 1.4 runs through the driven sprocket 1.3, and torque limiters 2 are symmetrically provided at both ends of the transmission shaft 1.4.

[0019] The torque limiter 2 includes a gear shaft 2.7, a passive bevel gear 2.2 is provided on the gear shaft 2.7, a transmission bevel gear 2.1 is provided on the transmission shaft 1.4, and the transmission bevel gear 2.1 is meshed with the passive bevel gear 2.2; friction plates 2.4 are fixed on the friction surfaces of the top and bottom of the passive bevel gear 2.2 through a pressure plate 2.3 and a chassis 2.5 respectively, and a butterfly spring 2.6 is provided at the bottom of the chassis 2.5. An internal thread is provided on the inner hole of the pressure plate 2.3, and the pressure plate 2.3 is meshed with the upper thread of the gear shaft 2.7. Downward pressure can be applied downward by rotating the pressure plate 2.3, and the more the pressure plate 2.3 is screwed downward, the greater the downward pressure. While the pressure plate 2.3 provides downward pressure, the butterfly spring 2.6 provides upward pressure, so that the friction plates 2.4 at the top and bottom of the passive bevel gear 2.2 are firmly pressed on the upper and lower friction surfaces of the passive bevel gear 2.2.

[0020] Since the transmission bevel gear 2.1 and the passive bevel gear 2.2 are meshed, the driving mechanism drives the transmission bevel gear 2.1 to drive the passive bevel gear 2.2. When the opening and closing action is normal, that is, the gear shaft 2.7 can rotate normally, the passive bevel gear 2.2 drives the gear shaft 2.7 to rotate normally through the upper and lower friction plates 2.4. When the opening and closing action encounters an obstacle and cannot be further opened or closed, the gear shaft 2.7 encounters an obstacle and cannot rotate. At this time, the motor continuously outputs torque to the transmission bevel gear 2.1. When the torque exceeds the friction force provided by the friction plate 2.4, the passive bevel gear 2.2 breaks through the friction force limit, and the passive bevel gear 2.2 rotates, while the gear shaft 2.7 does not rotate. Therefore, when the equipment clamps the steel plate normally, the driving mechanism drives the transmission bevel gear 2.1, and the passive bevel gear 2.2 rotates at this time, and the gear shaft 2.7 is driven to rotate through the friction force, thereby realizing the opening and closing action.

[0021] It is known that the friction force formula is pressure multiplied by friction coefficient. When the friction coefficient of the friction plate is fixed, the pressure is adjusted by adjusting the pressure plate 2.3, thereby adjusting the friction force, and torque control is achieved through friction force.

[0022] The clamping mechanism 3 comprises a first rack 3.1 and a second rack 3.2 which are symmetrically arranged. Both the first rack 3.1 and the second rack 3.2 are meshed with the passive bevel gear 2.2. The free end of the first rack 3.1 is connected to a first clamp arm 3.4, and the free end of the second rack 3.2 is connected to a second clamp arm 3.3.

[0023] When the steel plate lifting machine of the present application is used to clamp steel plates with different widths at both ends, the driving mechanism 1 provides the initial clamping force. At this time, since the clamping has just started, the first clamp arm 3.4 and the second clamp arm 3.3 have not yet contacted the steel plate, so the resistance to the movement of the clamping mechanism 3 does not exceed the torque range limited by the torque limiter 3, and the clamping mechanisms 3 on both sides perform the closed clamping action normally. After the clamping mechanism 3 on either side clamps the steel plate, the motor 1.1 continues to output torque. At this time, the resistance generated by the clamping mechanism 3 on the side that has clamped the steel plate is greater than the torque range limited by the torque limiter 2, and the friction plate 2.4 in the torque limiter 2 begins to slip and no longer continues to clamp. The resistance of the clamping mechanism 3 on the other side that has not clamped the steel plate is still within the torque range limited by the torque limiter 2, so it can still continue to clamp. That is, when the clamping mechanism 3 on one side has contacted the edge of the steel plate and can no longer close and clamp, the clamping mechanism 3 on the other side can still continue to close and clamp without restriction, so that the clamps on both sides can automatically adapt to the different widths of steel plates through the adaptability of torque when clamping steel plates with different widths at both ends. Reliable clamping. When the clamping mechanisms 3 on both sides are all clamped in place and the torque limiters 2 on both sides are all slipped, the drive mechanism 1 stops outputting. At this time, even if the width dimensions of the two ends of the steel plate are different, the steel plate elevator can still adapt to the different width dimensions of the same steel plate for reliable clamping.

Claims

1. A torque adaptive device for a steel plate hoist, characterized in that: It comprises a driving mechanism (1), wherein torque limiters (2) are symmetrically connected to both sides of the driving mechanism (1), and a clamping mechanism (3) is connected to the bottom of the torque limiter (2).

2. A torque adaptive device for a steel plate hoist as claimed in claim 1, characterized in that: The driving mechanism (1) comprises an electric motor (1.1), an output shaft of the electric motor (1.1) is provided with a driving sprocket (1.2), the driving sprocket (1.2) is connected to a driven sprocket (1.3) via a chain, a transmission shaft (1.4) is provided through the driven sprocket (1.3), and torque limiters (2) are symmetrically provided at both ends of the transmission shaft (1.4).

3. A torque adaptive device for a steel plate hoist as claimed in claim 2, characterized in that: The torque limiter (2) comprises a gear shaft (2.7), a passive bevel gear (2.2) is provided on the gear shaft (2.7), a transmission bevel gear (2.1) is provided on the transmission shaft (1.4), and the transmission bevel gear (2.1) is meshed with the passive bevel gear (2.2); friction plates (2.4) are fixed to the friction surfaces at the top and bottom of the passive bevel gear (2.2) via a pressure plate (2.3) and a chassis (2.5), respectively, and a butterfly spring (2.6) is provided at the bottom of the chassis (2.5).

4. A torque adaptive device for a steel plate hoist as claimed in claim 3, characterized in that: An internal thread is provided on the inner hole of the pressure plate (2.3), and the pressure plate (2.3) engages with the upper thread of the gear shaft (2.7).

5. A torque adaptive device for a steel plate hoist according to any one of claims 1 to 4, characterized in that: The clamping mechanism (3) comprises a first rack (3.1) and a second rack (3.2) which are symmetrically arranged, the first rack (3.1) and the second rack (3.2) both being meshed with the passive bevel gear (2.2), the free end of the first rack (3.1) being connected to a first clamp arm (3.4), and the free end of the second rack (3.2) being connected to a second clamp arm (3.3).

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