Elevator traction device for mechanical energy storage system

Abstract

The elevator traction device for the mechanical energy storage system comprises an elevator, a traction wheel, a balancing weight, a diversion sheave, a traction belt and a dynamic pressing wheel braking assembly, the traction wheel is arranged at the bottom of the mechanical energy storage system, the diversion sheave is fixed to the top of the mechanical energy storage system, one end of the traction belt is fixedly connected with the top of the elevator, and the other end of the traction belt is fixedly connected with the other end of the elevator. The other end of the traction belt sequentially bypasses a traction shaft of the traction wheel and a shaft of the diversion sheave and then is fixedly connected with a balancing weight, and the weight of the balancing weight is larger than that of the elevator. The dynamic pressing wheel braking assembly is connected with the traction wheel in a rolling mode and located on the outer side of the traction belt on the traction shaft. According to the elevator traction device, the dead weight of the elevator and the overlarge driving motor are avoided, the investment cost is reduced, meanwhile, the friction force between the traction belt and the traction shaft can be prevented from being reduced when the elevator traction device brakes by adopting the dynamic pressing wheel braking assembly, the braking safety is improved, the elevator traction device can be repeatedly used, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of elevator traction, in particular to an elevator traction device for a mechanical energy storage system. Background Art

[0002] Mechanical energy storage system is a new form of energy storage that uses gravity blocks as energy storage media. It is increasingly used due to its many advantages such as high safety, no attenuation, long life, suitability for construction in various geographical conditions, and environmental friendliness.

[0003] However, existing mechanical energy storage systems all use traction-type lifting: the first type arranges a lift and a counterweight on both sides of the traction shaft, and the weight of the lift and the counterweight needs to be equal; the second type arranges a lift on each side of the traction shaft, and the weight of the lifts on both sides of the traction shaft needs to be equal. When the above two mechanical energy storage systems are charging, storing energy or discharging, the resistance that the mechanical energy storage system needs to overcome is the weight of the cargo. To ensure safety, the weight of the drive motor and the lift needs to be large enough to ensure the traction coefficient and driving force safety. Since the weight of the lift and the drive motor of the above mechanical energy storage system are large, the equipment investment increases.

[0004] Furthermore, existing mechanical energy storage systems can cause the elevator traction device to slip during braking due to insufficient friction between the traction belt and the traction shaft, leading to brake failure. A common solution currently is a traction shaft clamp-type brake system. This system employs a pair of clamps placed on the traction shaft. During braking, the clamps directly squeeze the traction shaft, pressing the traction belt against it and achieving braking. However, this system can damage the traction belt itself. For safety reasons, the traction belt must be replaced after each use, making the brake system prohibitively expensive and prohibitive for frequent use. Utility Model Content

[0005] In response to the problems existing in the prior art, the utility model provides an elevator traction device for a mechanical energy storage system, which avoids the elevator's own weight and the driving motor being too large. At the same time, the utility model adopts a dynamic pressure wheel brake assembly to avoid reducing the friction between the traction belt and the traction shaft when the elevator traction device is braked, thereby improving braking safety, and can be reused to reduce costs.

[0006] To achieve the above technical objectives, the present invention adopts the following technical solutions: an elevator traction device for a mechanical energy storage system, comprising: an elevator, a traction wheel, a counterweight, a return pulley, a dynamic pressure wheel brake assembly and a traction belt, wherein the traction wheel is arranged at the bottom of the mechanical energy storage system, the return pulley is fixed to the top of the mechanical energy storage system, one end of the traction belt is fixedly connected to the top of the elevator, and the other end of the traction belt is fixedly connected to the counterweight after passing through the traction shaft of the traction wheel and the shaft of the return pulley in sequence; the dynamic pressure wheel brake assembly is rollingly connected to the traction wheel, and the dynamic pressure wheel brake assembly is located on the outside of the traction belt on the traction shaft.

[0007] Furthermore, the dynamic pressure wheel brake assembly is located on a side close to the counterweight block.

[0008] Furthermore, the dynamic pressure wheel brake assembly includes: a pressure wheel, a connecting rod, a driving cylinder and a base, one end of the connecting rod is fixedly connected to the shaft of the pressure wheel, and the pressure wheel moves along the inner wall of the traction wheel; the other end of the connecting rod is hinged to the base, the telescopic end of the driving cylinder is hinged to the connecting rod, and the fixed end of the driving cylinder is hinged to the base.

[0009] Furthermore, the traction sheave is fixed on the base.

[0010] Furthermore, the mass of the counterweight block is greater than the mass of the elevator, and the counterweight block is a segmented counterweight block.

[0011] Furthermore, the segmented counterweight block is composed of an upper half counterweight block and a lower half counterweight block fixedly connected.

[0012] Furthermore, the mass of the upper half counterweight block is equal to the mass of the elevator itself, and the mass of the lower half counterweight block is half of the mass of the gravity block.

[0013] Furthermore, it also includes a vertical guide rail, and the elevator is arranged on the vertical guide rail.

[0014] Compared with the prior art, the present invention has the following beneficial effects: the present invention adopts a segmented counterweight block in the elevator traction device for the mechanical energy storage system, and its mass is greater than the mass of the elevator. Through the asymmetric counterweight, the motor torque required by the gravity block of the mechanical energy storage system during the charging and discharging process can be reduced, thereby reducing the driving power of the driving motor and reducing the investment cost; at the same time, the present invention designs a dynamic pressure wheel brake assembly. During the dynamic movement of the dynamic pressure wheel brake assembly, as the traction shaft wrap angle increases, the friction between the traction shaft of the traction wheel and the traction belt also increases, thereby increasing the braking capacity and improving the braking safety factor; in addition, the dynamic pressure wheel brake assembly in the present invention is only used during the braking process, does not affect the transmission efficiency during normal operation, and can be reused to reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of an elevator traction device for a mechanical energy storage system according to the present invention;

[0016] Figure 2 This is a schematic diagram of the dynamic pressure wheel brake assembly in the present invention during the braking process of the elevator traction device;

[0017] Figure 3 This is a schematic diagram of the dynamic pressure wheel brake assembly of the present invention during normal operation of the elevator traction device;

[0018] Among them, 1-lift elevator, 2-vertical guide rail, 3-traction wheel, 4-counterweight, 41-upper counterweight, 42-lower counterweight, 5-reverse rope pulley, 6-dynamic pressure wheel brake assembly, 61-pressure wheel, 62-connecting rod, 63-driving cylinder, 64-base, 7-traction belt, 8-gravity block. DETAILED DESCRIPTION

[0019] The technical solution of the present utility model will be further explained below with reference to the accompanying drawings.

[0020] like Figure 1 This is a schematic diagram of the elevator traction device for the mechanical energy storage system of the utility model, which includes: an elevator 1, a traction wheel 3, a counterweight 4, a return pulley 5, a dynamic pressure wheel brake assembly 6 and a traction belt 7. The traction wheel 3 is arranged at the bottom of the mechanical energy storage system, and the traction shaft of the traction wheel 3 is driven to rotate by a drive motor; the return pulley 5 is fixed to the top of the mechanical energy storage system, one end of the traction belt 7 is fixedly connected to the top of the elevator 1, and the other end of the traction belt 7 is fixedly connected to the counterweight 4 after passing around the traction shaft of the traction wheel 3 and the shaft of the return pulley 5 in turn. When the drive motor drives the traction shaft of the traction wheel 3 to rotate, the friction between the traction shaft and the traction belt 7 drives the elevator 1 to move up and down with the gravity block 8, thereby realizing the energy storage charging and discharging process of the mechanical energy storage system. In addition, the dynamic pressure wheel brake assembly 6 is rollingly connected to the traction wheel 3, and the dynamic pressure wheel brake assembly 6 is located on the outside of the traction belt 7 on the traction shaft. During the dynamic movement of the dynamic pressure wheel brake assembly 6, as the traction shaft wrap angle increases, the friction between the traction shaft of the traction wheel 3 and the traction belt 7 also increases, thereby increasing the braking capacity and improving the braking safety factor; in addition, the dynamic pressure wheel brake assembly 6 in the present invention is only used during the braking process, does not affect the transmission efficiency during normal operation, and can be reused to reduce costs.

[0021] like Figure 2-3When the driving cylinder 63 is extended or retracted, the connecting rod 62 and the pressure wheel 61 move clockwise or counterclockwise around the connected hinge point, reducing or increasing the wrap angle between the traction shaft and the traction belt 7.

[0022] like Figure 2 When the elevator traction device needs to brake, the connecting rod 62 moves counterclockwise by driving the oil cylinder 63 to move in an extension and contraction manner, so that the pressure wheel 61 presses on the traction belt 7, and the wrap angle of the traction belt 7 on the traction shaft increases from 180° to 200°-240°, so that the friction between the traction belt 7 and the traction shaft increases, the braking capacity is enhanced, and the braking safety factor is improved; Figure 3 When the elevator traction device is operating normally, the telescopic movement of the driving cylinder 63 drives the connecting rod 62 to move clockwise, so that the pressure wheel 61 does not press on the traction belt 7, which will not affect the transmission efficiency during normal operation.

[0023] In the present invention, the dynamic pressure wheel brake assembly 6 is located on the side close to the counterweight block 4, which can reduce the driving force of the pressure wheel 61 in the dynamic pressure wheel brake assembly 6 during operation; when the driving force of the driving cylinder 63 in the dynamic pressure wheel brake assembly 6 is large, the dynamic pressure wheel brake assembly 6 can be arranged on the side close to the elevator 1.

[0024] In one technical solution of the present invention, the mass of the counterweight block 4 is greater than the mass of the elevator 1, and the counterweight block 4 is a segmented counterweight block. Through this asymmetric counterweight, the motor torque required for the weight of the gravity block can be reduced, thereby reducing the driving power of the driving motor.

[0025] The segmented counterweight block in the present invention is composed of an upper counterweight block 41 and a lower counterweight block 42 fixedly connected. The mass of the upper counterweight block 41 is equal to the mass of the elevator 1 itself, and the mass of the lower counterweight block 42 is half of the mass of the gravity block 8. When the mechanical energy storage system is installed and debugged, the elevator 1 first forms a lifting system with the upper counterweight block 41. At this time, the weight on both sides of the traction shaft is the same when the elevator is unloaded, which is convenient for light load debugging of the elevator and ensures the safety of the equipment during operation. After the light load debugging is completed, the lower counterweight block 42 is installed. At this time, the weight difference on both sides of the traction shaft reaches the set value, and subsequent debugging tests can be carried out. The segmented counterweight block has the advantage of easy installation and debugging.

[0026] When the elevator traction device is used to lift the weight block 8 at a constant speed, the load torque T generated on the traction shaft is 1a =(Me+Mb-Mc)×r×g=(Me+Mb-Me+Mb / 2)×r×g=Mb×r×g / 2; After lifting, the elevator 1 descends without load, and the segmented counterweight 4 rises. At this time, the torque T on both sides of the traction shaft 1b =(Mc-Me)×r×g=Mb×r×g / 2, where Me represents the mass of the elevator 1, Mb represents the mass of the weight block 8, Mc represents the mass of the segmented counterweight 4, r represents the radius of the traction shaft, and g represents the acceleration due to gravity. For existing elevator traction devices using symmetrical counterweights, since the weight of the counterweight is equal to the weight of the elevator itself, the load torque generated on the traction shaft when the weight block rises or falls at a uniform speed during energy storage or discharge is: T2=(Me+Mb-Mc)×r×g=(Me+Mb-Me)×r×g=Mb×r×g. It can be seen that compared with existing elevator traction devices, the torque that the traction shaft needs to overcome when the weight block 8 of the same weight is raised or lowered at a uniform speed in the elevator traction device of the present invention is half that of the existing technology. Therefore, the segmented counterweight used in the present invention can reduce the rated torque of the drive motor, thereby reducing equipment investment.

[0027] In a technical solution of the present invention, a vertical guide rail 2 is further included, and the elevator 1 is arranged on the vertical guide rail 2, so that the elevator 1 moves vertically up and down along the vertical guide rail 2.

[0028] The above are only preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. An elevator traction device for a mechanical energy storage system, characterized in that: include: The invention relates to an elevator (1), a traction wheel (3), a counterweight (4), a deflector pulley (5), a dynamic pressure wheel brake assembly (6) and a traction belt (7), wherein the traction wheel (3) is arranged at the bottom of a mechanical energy storage system, the deflector pulley (5) is fixed to the top of the mechanical energy storage system, one end of the traction belt (7) is fixedly connected to the top of the elevator (1), and the other end of the traction belt (7) is fixedly connected to the counterweight (4) after passing through the traction shaft of the traction wheel (3) and the shaft of the deflector pulley (5) in sequence; the dynamic pressure wheel brake assembly (6) is rollingly connected to the traction wheel (3), and the dynamic pressure wheel brake assembly (6) is located on the outside of the traction belt (7) on the traction shaft.

2. The elevator traction device for a mechanical energy storage system according to claim 1, characterized in that: The dynamic pressure wheel brake assembly (6) is located on a side close to the counterweight (4).

3. An elevator traction device for a mechanical energy storage system according to claim 1 or 2, characterized in that: The dynamic pressure wheel brake assembly (6) comprises: a pressure wheel (61), a connecting rod (62), a driving oil cylinder (63) and a base (64); one end of the connecting rod (62) is fixedly connected to the axis of the pressure wheel (61), and the pressure wheel (61) moves along the inner wall of the traction wheel (3); the other end of the connecting rod (62) is hinged to the base (64); the telescopic end of the driving oil cylinder (63) is hinged to the connecting rod (62), and the fixed end of the driving oil cylinder (63) is hinged to the base (64).

4. The elevator traction device for a mechanical energy storage system according to claim 3, characterized in that: The traction wheel (3) is fixed on a base (64).

5. The elevator traction device for a mechanical energy storage system according to claim 1, characterized in that: The mass of the counterweight block (4) is greater than the mass of the elevator (1), and the counterweight block (4) is a segmented counterweight block.

6. The elevator traction device for a mechanical energy storage system according to claim 5, characterized in that: The segmented counterweight block is composed of an upper half counterweight block (41) and a lower half counterweight block (42) which are fixedly connected.

7. The elevator traction device for a mechanical energy storage system according to claim 6, characterized in that: The mass of the upper half counterweight block (41) is equal to the mass of the elevator (1), and the mass of the lower half counterweight block (42) is half the mass of the gravity block (8).

8. The elevator traction device for a mechanical energy storage system according to claim 1, characterized in that: It also includes a vertical guide rail (2), and the elevator (1) is arranged on the vertical guide rail (2).

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