Vertical shaft hoist emergency braking speed vibration suppression device

Abstract

The utility model discloses a vertical shaft hoist emergency braking speed vibration suppression device, and relates to the technical field of friction type hoist emergency braking, a vertical shaft hoist comprises a roller, a head sheave and a steel wire rope arranged on the roller, and the suppression device comprises a fixed tensioning wheel which is arranged below the roller and abuts against the inner side of the steel wire rope. The restraining device further comprises a movable tensioning wheel located on the outer side of the steel wire rope, the movable tensioning wheel can be driven by the power mechanism to move transversely, and the part, between the fixed tensioning wheel and the roller, of the steel wire rope is divided into two equal parts through the movable tensioning wheel. When the steel wire rope is stretched or shortened to generate vibration due to the influence of load inertia and self elastic characteristics, the movable tensioning wheel moves towards the steel wire rope, the stretching amount and the tensioning force of the steel wire rope are changed, and the purpose of eliminating vibration caused by elastic deformation is achieved.

Description

Technical Field

[0001] This utility model relates to the field of emergency braking technology for friction hoists, and in particular to a vibration suppression device for emergency braking speed of vertical shaft hoists. Background Technology

[0002] During operation, the hoisting container is constrained by the guide rails within the shaft, effectively suppressing horizontal vibrations. The resulting vibrations are primarily longitudinal. Based on research into the operating characteristics of the hoisting system, during operation, the motor drives the friction drum to rotate. Under normal conditions, the entire hoisting system generates longitudinal vibrations, most notably the impact vibrations generated during brake-activated stops. Most of the vibration energy is dissipated by the damping of the hoisting system's wire ropes. Factors such as slippage between the wire rope and the drum, and friction between the hoisting container and the guide rails consume very little energy and can be considered negligible. However, the energy dissipated solely by the wire rope damping takes a considerable amount of time to reach equilibrium, leading to more severe impacts during emergency braking. Utility Model Content

[0003] The purpose of this invention is to provide a vibration suppression device for emergency braking of vertical shaft hoists, which aims to solve the technical problem that the hoisting container will generate severe impacts under emergency braking and other conditions in the prior art.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] The vertical shaft hoist emergency braking speed vibration suppression device includes a drum, a sheave, and a wire rope mounted on the drum. The suppression device includes a fixed tensioning wheel located below the drum and against the inner side of the wire rope. The suppression device also includes a movable tensioning wheel located on the outer side of the wire rope. The movable tensioning wheel can move laterally under the drive of a power mechanism, and the movable tensioning wheel divides the wire rope between the fixed tensioning wheel and the drum into two equal parts.

[0006] With the above structure, when the wire rope vibrates due to the load inertia and its own elastic properties, the movable tensioning wheel moves toward the wire rope, thereby changing the wire rope elongation and tension, and achieving the purpose of eliminating vibration caused by elastic deformation.

[0007] Preferably, a speed sensor is installed on the movable tensioning pulley. The speed sensor measures the speed of the movable tensioning pulley, thereby obtaining the vibration displacement of the wire rope, and then calculating the distance that the fixed tensioning pulley needs to move laterally, accurately offsetting the elongation of the wire rope and quickly eliminating the vibration caused by elastic deformation.

[0008] Preferably, the suppression device further includes a controller capable of controlling the output displacement of the movable tension wheel. The controller is electrically connected to a speed sensor, and the controller contains a calculation program for calculating the output displacement of the movable tension wheel. The speed sensor transmits a speed signal to the controller, which calculates the output displacement of the movable tension wheel, thereby quickly eliminating the vibration caused by elastic deformation.

[0009] Preferably, the power mechanism is a hydraulic cylinder that drives the movable tension wheel to move. By driving the movable tension wheel with the hydraulic cylinder, vibration caused by elastic deformation is eliminated.

[0010] Preferably, both the movable tensioning wheel and the fixed tensioning wheel have annular grooves on their bodies to accommodate the wire rope. The movement of the wire rope within these annular grooves increases its stability.

[0011] Preferably, the hoist is equipped with a fixed frame, and a support frame is mounted on the fixed frame. The fixed tension wheel is rotatably mounted on the support frame. Mounting the fixed tension wheel on the support frame facilitates its installation.

[0012] After adopting the above technical solution, the beneficial effects of this utility model are:

[0013] When the wire rope elongates or shortens due to load inertia and its own elastic properties, causing vibration, the movable tensioning wheel moves toward the wire rope, thereby changing the elongation and tension of the wire rope to eliminate the vibration caused by elastic deformation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the emergency braking speed vibration suppression device for vertical shaft hoisting machines of this utility model;

[0015] Figure 2 This is the control principle diagram of this utility model;

[0016] Figure 3 This is a schematic diagram illustrating the calculation principle of the output displacement;

[0017] Figure 4 This is a schematic diagram of the movable tensioning wheel;

[0018] Figure 5 This is a schematic diagram of the installation structure of the movable tensioning wheel;

[0019] Figure 6 This is a schematic diagram of the structure of the fixed tensioning wheel.

[0020] In the diagram, 1 is a roller, 2 is a sheave, 3 is a wire rope, 4 is a fixed tensioning wheel, 5 is a movable tensioning wheel, 6 is a hydraulic cylinder, 7 is an annular groove, 8 is a fixed frame, 9 is a support frame, 10 is a mounting frame, 11 is a movable frame, 12 is a guide rod, 13 is a skip, and 14 is a tail rope. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] The orientations mentioned in this specification are based on the orientation of the emergency braking speed vibration suppression device of the vertical shaft hoist when it is working normally. They do not limit the orientation during storage and transportation, and only represent relative positional relationships, not absolute positional relationships.

[0023] like Figures 1 to 6 As shown, this is an emergency braking speed vibration suppression device for a vertical shaft hoist. The vertical shaft hoist includes a drum 1, a sheave 2, and a wire rope 3 mounted on the drum 1. It also includes a skip 13 and a tail rope 14. The suppression device includes a fixed tensioning wheel 4 located below the drum 1 and abutting the inner side of the wire rope 3. The suppression device also includes a movable tensioning wheel 5 located on the outer side of the wire rope 3. The movable tensioning wheel 5 can move laterally under the drive of a power mechanism, dividing the wire rope 3 between the fixed tensioning wheel 4 and the drum 1 into two equal parts.

[0024] The wire rope 3 is wrapped around the drum 1 and placed on the sheave. The two ends of the wire rope 3 are connected to the upper ends of the two skips 13 respectively, and the two ends of the tail rope 14 are connected to the bottom of the two skips 13 respectively.

[0025] When the wire rope 3 elongates or shortens due to load inertia and its own elastic properties, causing vibration, the movable tension wheel 5 moves toward the wire rope 3, thereby changing the elongation and tension of the wire rope 3, so as to eliminate the vibration caused by elastic deformation.

[0026] The movable tensioning wheel 5 is equipped with a speed sensor. The speed sensor measures the speed of the movable tensioning wheel 5, thereby obtaining the vibration displacement of the wire rope 3. This allows for the calculation of the lateral distance that the fixed tensioning wheel 4 needs to move, accurately offsetting the elongation of the wire rope 3 and quickly eliminating the vibration caused by elastic deformation.

[0027] In a preferred embodiment, both the movable tensioning wheel 5 and the fixed tensioning wheel 4 have annular grooves 7 on their bodies to accommodate the wire rope 3. The movement of the wire rope 3 within the annular grooves 7 increases the stability of its movement. It is important to note that the speed sensor detects the linear velocity of the annular grooves 7.

[0028] The hoist is equipped with a fixed frame 8, and a support frame 9 is mounted on the fixed frame 8. The fixed tension wheel 4 is rotatably mounted on the support frame 9. The support frame 9 is U-shaped. Mounting the fixed tension wheel 4 on the support frame 9 facilitates its installation.

[0029] Specifically, the speed sensor includes a roller that makes rolling contact with the annular groove 7 on the movable tensioning wheel 5. When the movable tensioning wheel rotates under the drive of the wire rope, the roller also rotates, and the speed sensor calculates the real-time linear velocity of the annular groove 7, which is the linear velocity of the wire rope.

[0030] The suppression device also includes a controller capable of controlling the output displacement of the movable tension wheel 5. The controller is electrically connected to a speed sensor and contains a calculation program for calculating the output displacement of the movable tension wheel 5. The speed sensor transmits a speed signal to the controller, which calculates the output displacement of the movable tension wheel 5, quickly eliminating the vibration caused by elastic deformation. The output displacement of the movable tension wheel 5 is the distance that the movable tension wheel needs to move laterally.

[0031] The power mechanism is a hydraulic cylinder 6 that drives the movable tension wheel 5 to move. By driving the movable tension wheel 5 to move through the hydraulic cylinder 6, vibrations caused by elastic deformation are eliminated.

[0032] The controller is connected to the hydraulic cylinder actuator. The controller outputs a signal to control the hydraulic actuator, which in turn outputs hydraulic drive to change the displacement of the tensioning wheel, thereby changing the elongation and tension of the wire rope 3.

[0033] The specific control method of this utility model is as follows: When the lifting system brakes in an emergency, the wire rope 3 will elongate or shorten due to the load inertia and its own elastic characteristics, causing vibration. The speed sensor detects the speed of the movable tension wheel 5 and feeds the speed signal back to the controller. The controller calculates the output displacement of the movable tension wheel 5 required to eliminate the vibration and calculates the required hydraulic driving force. The controller then outputs a signal to control the hydraulic cylinder actuator, causing the hydraulic cylinder actuator to output hydraulic driving force, change the displacement of the tension wheel, and thus change the elongation and tension of the wire rope 3, thereby eliminating the vibration caused by elastic deformation. The lifting system outputs a speed signal, which is then negatively fed back to the speed sensor to form a closed loop.

[0034] The control principle of the output displacement of the movable tensioning wheel 5 can be simplified as follows: the output displacement of the control hydraulic cylinder 6, together with the drum 1 and the fixed hydraulic wheel, forms an isosceles triangle structure. When the wire rope 3 generates a vibration displacement x, the vibration displacement x is expressed at the wire rope 3 between the drum 1 and the fixed tensioning wheel 4 by controlling the output displacement y. Therefore, there is a relationship between the output displacement y of the movable tensioning wheel and the vibration displacement x of the wire rope 3:

[0035]

[0036] In the formula, y represents the output displacement of the movable tensioning wheel 5; x is the vibration displacement of the wire rope 3; and h is the height between the drum 1 and the fixed hydraulic wheel.

[0037] Depend on We can obtain:

[0038] x=∫Vdt;

[0039] In the formula, x is the vibration displacement of wire rope 3; V is the vibration velocity of wire rope 3.

[0040] The movement of the wire rope 3 drives the rotation of the movable tension wheel 5. The vibration speed V of the wire rope 3 is the linear speed of the movable tension wheel 5, which can be measured by a speed sensor.

[0041] The hoist is equipped with a mounting frame 10, on which a movable frame 11 is slidably mounted. A movable tension wheel 5 is rotatably mounted on the movable frame 11. The fixed end of the hydraulic cylinder 6 is mounted on the mounting frame 10, and the movable end of the hydraulic cylinder 6 is mounted on the movable frame 11. A guide rod 12 is mounted on the movable frame 11. The mounting frame 10 has a guide hole for the guide rod 12 to slide. The guide rod 12 can guide and support the movement of the movable frame 11.

[0042] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A vibration suppression device for emergency braking speed of a vertical shaft hoist, the vertical shaft hoist comprising a drum, a sheave, and a wire rope mounted on the drum, characterized in that, The suppression device includes a fixed tensioning wheel located below the drum and against the inner side of the wire rope. The suppression device also includes a movable tensioning wheel located on the outer side of the wire rope. The movable tensioning wheel can move laterally under the drive of the power mechanism, and the movable tensioning wheel divides the wire rope between the fixed tensioning wheel and the drum into two equal parts.

2. The vibration suppression device for emergency braking speed of a vertical shaft hoist as described in claim 1, characterized in that, A speed sensor is installed on the movable tensioning wheel.

3. The vibration suppression device for emergency braking speed of a vertical shaft hoist as described in claim 2, characterized in that, The suppression device also includes a controller that can control the output displacement of the movable tension wheel. The controller is electrically connected to the speed sensor and has a calculation program for calculating the output displacement of the movable tension wheel.

4. The vibration suppression device for emergency braking speed of a vertical shaft hoist as described in claim 3, characterized in that, The power mechanism is a hydraulic cylinder that drives the movable tension wheel to move.

5. The vibration suppression device for emergency braking speed of a vertical shaft hoist as described in claim 1, characterized in that, Both the movable tensioning wheel and the fixed tensioning wheel have annular grooves on their bodies to accommodate the wire rope.

6. The vibration suppression device for emergency braking speed of a vertical shaft hoist as described in claim 1, characterized in that, The hoist is equipped with a fixed frame, and a support frame is installed on the fixed frame. The tension wheel is fixedly mounted on the support frame.

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