Ramp type collision test system

Abstract

The invention discloses a ramp type collision test system, the system comprises a dragging and releasing mechanism, a reset mechanism, a dragging and releasing winding drum and a traction winding drum, the dragging and releasing winding drum and the traction winding drum have the same diameter and are arranged in parallel, the dragging and releasing winding drum is located between the dragging and releasing mechanism and the reset mechanism, and the traction winding drum is located on one side, close to a ramp, of the dragging and releasing winding drum. The system has the functions of multifunctional integration and cooperative control, the contradictory requirement of high-speed downhill collision and low-speed uphill reset is met through cooperative operation of the dragging and dropping mechanism, the reset mechanism and the traction mechanism, and the system adapts to various working conditions such as no-load and full-load conditions; the variable frequency speed regulation technology is adopted, the acceleration of the carrying platform is matched in real time, the speed of the platform can be accurately maintained at different rated values, and the high-precision test requirement is met; a brake and a normally closed safety disc brake are combined, and real-time monitoring is performed through a speed sensor and a positioning sensor, so that a software and hardware combined multiple safety protection mechanism is formed, and the safety and reliability of system operation are ensured.

Description

Technical Field

[0001] This application relates to the field of collision testing technology, and more particularly to a ramp-type collision testing system. Background Technology

[0002] In collision tests, vehicle safety tests, and cargo cushioning tests in rail transportation, it is often necessary to release a heavy platform carrying the test specimen from the crest of a slope, accelerate it along the track, and impact the target (such as a buffer or barrier) at a predetermined, precise speed. After the collision, the platform must be smoothly and reliably returned to its initial position at the crest of the slope for the next test. Currently, this test is generally carried out using traditional winches or other traction equipment, which suffers from insufficient speed control precision, limited functionality, inability to handle both high and low speed requirements, low automation, and a lack of redundancy and safety features. Summary of the Invention

[0003] To address the aforementioned problems, this application aims to provide a ramp-type collision testing system that integrates the dragging, resetting, and traction functions of the transport platform into one unit. This system can enable the transport platform to complete collisions with precise acceleration under different load conditions and to reset smoothly at low speeds. It effectively solves the problems of insufficient test speed control accuracy, limited functionality, low test efficiency, and lack of redundancy and safety in existing testing systems.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: a ramp-type collision test system, including a ramp, the top of the ramp having a straight section, the bottom of the ramp having a collision end, and the straight section and the ramp having guide rails continuously arranged in the slope direction, and a transport platform moving along the guide rails.

[0005] The straight section is provided with a dragging mechanism, a reset mechanism, a dragging drum and a traction drum on the outside. The dragging drum and the traction drum have the same diameter and are arranged in parallel. The dragging drum is located between the dragging mechanism and the reset mechanism, and the traction drum is located on the side of the dragging drum closer to the ramp.

[0006] The towing mechanism includes a towing motor and a towing reducer. The input end of the towing reducer is connected to the motor shaft of the towing motor, and the output end of the towing reducer synchronously drives the towing drum and the traction drum to rotate. A towing wire rope is wound on the towing drum, and the end of the towing wire rope is connected to the tail of the transport platform after being guided. A traction wire rope is wound on the traction drum, and the end of the traction wire rope is connected to the front of the transport platform after being guided.

[0007] The reset mechanism includes a reset motor and a reset reducer. The input end of the reset reducer is connected to the motor shaft of the reset motor, and the output end of the reset reducer is connected to the drag drum via a clutch.

[0008] Both the tractor motor and the reset motor are variable frequency motors; brakes are installed on the motor shafts of both the tractor motor and the reset motor; a speed sensor and a positioning sensor are installed at the bottom of the ramp, and the positioning sensor is close to the collision end.

[0009] The system also includes a control device, which is electrically connected to the tractor motor, reset motor, clutch, brake, speed sensor and positioning sensor respectively.

[0010] Preferably, two drag wire ropes are wound side by side on the drag drum, and one traction wire rope is wound side by side on the traction drum.

[0011] Preferably, the output end of the drag reducer is connected to the traction drum via a ball chain.

[0012] Preferably, the front of the transport platform is provided with a first guide pulley, and the bottom, top and straight sections of the ramp are provided with a plurality of second guide pulleys. The traction steel wire rope passes around the second guide pulleys in sequence and is connected to the first guide pulley. The rear of the transport platform is provided with a third guide pulley, and the straight sections are provided with a plurality of fourth guide pulleys arranged side by side. The towing steel wire rope passes around the fourth guide pulleys and is connected to the third guide pulley.

[0013] Preferably, a disc brake is also provided on the side of the drag-and-drop drum.

[0014] Preferably, the transport platform is a test vehicle, and it is mounted on the guide rail via rollers at its bottom.

[0015] The beneficial effects of this application are:

[0016] (1) This invention integrates three mechanisms: dragging, resetting, and traction. By controlling the coordinated operation of these three mechanisms, it solves the contradiction between high-speed downhill collision and low-speed uphill resetting, and adapts to various working conditions such as no load and full load.

[0017] (2) The present invention adopts frequency conversion speed regulation technology to match the acceleration of the carrier platform in real time and accurately control the collision speed. It can accurately maintain the platform collision speed at different rated values ​​(such as 30km / h, 35km / h, 3km / h) to meet the requirements of high-precision test.

[0018] (3) The present invention has high reliability and redundant safety. The redundant design of the four-section drum ensures that the system can still complete the working cycle when a single wire rope of the drag drum breaks, thus avoiding platform loss of control. The jaw clutch effectively isolates the high-speed and low-speed mechanisms, protecting the equipment safety.

[0019] (4) The present invention has multi-level safety braking. By combining block brakes and disc brakes, and by real-time monitoring by speed sensors and positioning sensors, a multi-level safety protection mechanism combining hardware and software is formed to ensure the safe and reliable operation of the system.

[0020] (5) The system of the present invention is easy to maintain, and the system maintenance and replacement of parts are convenient and quick with short downtime. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this application;

[0022] Figure 2 This is a schematic diagram of the integrated structure of the dragging mechanism, reset mechanism, dragging drum and traction drum of this application;

[0023] Figure 3 This is an enlarged view of the drag-and-drop mechanism in this application;

[0024] Figure 4 This is a top view of the reset mechanism in this application.

[0025] In the diagram: 1-Test base; 11-Straight section; 12-Ramp; 21-Towing motor; 22-Towing reducer; 23-Towing drum; 24-Towing wire rope; 31-Traction drum; 32-Traction wire rope; 4-Ball chain; 51-Reset motor; 52-Reset reducer; 6-Clutch; 71-Brake; 72-Disc brake; 8-Transportation platform; 91-Speed ​​sensor; 92-Positioning sensor; 10a-First guide pulley; 10b-Second guide pulley; 10c-Third guide pulley; 10d-Fourth guide pulley. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions of this application will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] See attached document Figures 1-4 The system shown is a ramp-type collision test system. The system is set on the test base 1 and includes a ramp 12. The top of the ramp 12 has a straight section 11 and the bottom of the ramp 12 is provided with a collision end. The straight section 11 and the ramp 12 are continuously provided with guide rails (not shown in the figure) in the slope direction. The guide rails are provided with a transport platform 8 that moves along the guide rails.

[0028] like Figure 1-2As shown, the straight section 11 is equipped with a towing mechanism, a reset mechanism, a towing drum 23, and a traction drum 31 on its outer side. The towing drum 23 and the traction drum 31 have the same diameter and are arranged in parallel. The towing drum 23 is located between the towing mechanism and the reset mechanism, and the traction drum 31 is located on the side of the towing drum 23 closer to the ramp 12. Under the connection of the ball chain 4, the towing wire rope 24 and the traction wire rope 32 are simultaneously unwound or wound. Firstly, when the transport platform 8 starts, it provides an initial positive traction force to overcome static friction and enable the transport platform 8 to start smoothly. Secondly, when going downhill unloaded, the towing motor 21 provides power to the traction drum 31, and the traction drum 31 provides additional positive tension to the transport platform 8, assisting the unloaded transport platform 8 to obtain greater acceleration, thereby achieving a higher collision speed (such as 35 km / h).

[0029] like Figure 2 As shown, the towing mechanism includes a towing motor 21 and a towing reducer 22. The input end of the towing reducer 22 is connected to the motor shaft of the towing motor 21 (via a coupling). The output end of the towing reducer 22 synchronously drives the towing drum 23 and the traction drum 31 to rotate. A towing wire rope 24 is wound on the towing drum 23, and its end is connected to the tail of the transport platform 8 after being guided. A traction wire rope 32 is wound on the traction drum 31, and its end is connected to the front of the transport platform 8 after being guided. This towing mechanism preferably uses a high-power motor drive to provide the main braking force and traction force required for the transport platform 8 to descend the slope, control the acceleration of the transport platform 8, and precisely adjust it through a frequency converter to maintain the transport platform 8 at a rated speed (e.g., 30 km / h when fully loaded, 35 km / h when unloaded) for downhill collision.

[0030] like Figure 2 As shown, the reset mechanism includes a reset motor 51 and a reset reducer 52. The input end of the reset reducer 52 is connected to the motor shaft of the reset motor 51, and the output end of the reset reducer 52 is connected to the towing drum 23 via a clutch 6 (preferably a jaw clutch). The clutch 6 controls the power switching during the collision and reset process of the transport platform 8. For example, when the transport platform 8 is descending at high speed, the clutch 6 disengages to prevent the reset reducer 52 from overspeeding and being damaged. When the transport platform 8 completes its collision and ascends the slope, the clutch 6 engages, and the reset motor 51 and the towing drum 21 drive the transport platform 8 uphill and reset at the same speed and force. The reset motor 51 is driven independently by a low-power variable frequency motor, used to drive the transport platform 8 to return to the top of the slope at a low and constant speed after the collision.

[0031] To achieve precise speed control of the towing, traction, and resetting of the transport platform 8, both the towing motor 21 and the resetting motor 51 are variable frequency motors. The speeds of the towing motor 21 and the resetting motor 51 are controlled by a frequency converter, and the unwinding and winding speeds of the towing wire rope 24 and the traction wire rope 32 are calculated based on the circumference of the towing drum 23, thereby precisely controlling the towing, traction, and resetting speeds of the transport platform 8. Figure 2 As shown, both the towing motor 21 and the reset motor 51 are equipped with brakes 71 (preferably block brake structures) on their motor shafts, which brake the rotation of the towing drum 23.

[0032] To further improve the accuracy of the collision speed, a speed sensor 91 and a positioning sensor 92 are installed at the bottom of the ramp 12, with the positioning sensor 92 close to the collision end. Before the transport platform 8 moves down to the speed sensor 91, the frequency converter of the tractor motor 21 adjusts the collision speed of the transport platform 8 to reach the set value and move down at a constant speed. After aligning with the speed sensor 91, the current speed of the transport platform 8 is detected again. If an error exists, the speed of the tractor motor 21 is adjusted via the frequency converter to ensure that the downward speed of the transport platform 8 matches the design speed. The transport platform 8 then continues to move down. Before approaching the collision end, the transport platform 8 aligns with the positioning sensor 92, and feedback is sent to the control device, which then stops the tractor motor 21, allowing the transport platform 8 to collide with the collision end at its current speed. This avoids the problem of the tractor motor 21 continuing to pull the transport platform 8 during and after the collision, which could lead to the tractor wire rope 32 continuing to tighten and break.

[0033] To enable the system to operate automatically, the system also includes a control device, which is electrically connected to the tractor motor 21, the reset motor 51, the clutch 6, the brake 71, the speed sensor 91, and the positioning sensor 92, respectively. The control device is used to realize the variable frequency speed regulation and coordinated control of the tractor motor 21 and the reset motor 51, such as the slope control and recovery control of the transport platform 8, as well as system safety monitoring.

[0034] Preferably, for system security considerations, such as Figure 2 As shown, two towing wire ropes 24 are wound side by side on the towing drum 23, and one traction wire rope 32 is wound side by side on the traction drum 31. The towing wire ropes 24 provide the main gravity towing function of the transport platform 8. The two towing wire ropes 24 provide mechanical redundancy. If one wire rope breaks, the other towing wire rope 24 can still bear the entire load, ensuring that the transport platform 8 does not lose control and can complete the downhill or reset action. Figure 2The diagram shows two drag wire ropes 24 with four branches and one traction wire rope 32 with two branches. This is a conventional double-link single-layer winding method for drum wire ropes, meaning that a drum has two sections of rope grooves, one left-handed and one right-handed. One end of the wire rope is fixed in the left-handed groove area of ​​the drum, and after being led out, it passes through a series of pulleys (moving pulleys and fixed pulleys). The other end of the wire rope then winds back and is fixed in the right-handed groove area of ​​the drum. When the drum rotates, both sections of rope grooves are wound up and down simultaneously.

[0035] To ensure the smooth guidance of multi-strand steel wire ropes, such as Figure 1 As shown, the front of the transport platform 8 is provided with a first guide pulley 10a, and the bottom, top and straight sections 11 of the ramp 12 are provided with a plurality of second guide pulleys 10b. The traction steel wire rope 32 passes through the second guide pulleys 10b in sequence and is connected to the first guide pulley 10a. The rear of the transport platform 8 is provided with a third guide pulley 10c, and a plurality of fourth guide pulleys 10d are arranged side by side above the straight section 11. The dragging steel wire rope 24 passes through the fourth guide pulleys 10d and is connected to the third guide pulley 10c.

[0036] Because the drag drum 23 has a large rotational inertia, in order to further enhance the braking effect, such as Figure 4 As shown, a disc brake 72 is also provided on the side of the drag drum 23, which can effectively brake the rotational inertia of the drag drum 23.

[0037] Preferably, the transport platform 8 is a test vehicle, and is mounted on the guide rail by rollers at its bottom.

[0038] The usage method of the system disclosed in this application includes 11 working conditions: fully loaded straight section, fully loaded downhill, uphill reset, and unloaded downhill. The specific process is as follows:

[0039] Fully loaded straight working condition: When the transport platform 8 is fully loaded, the control device controls the clutch 6 to disengage, the tractor motor 21 starts at a low frequency, and drives the traction drum 31 to rotate through the ball chain 4. The traction drum 31 winds the traction steel wire rope 32, driving the fully loaded transport platform 8 to move at a constant speed (such as a constant speed of 3km / h) to the top of the slope 12 (the starting position of the downhill slope).

[0040] Fully loaded downhill condition: The towing motor 21 is started, and the traction wire rope 32 drives the transport platform 8 past the top of the slope 12, where it begins to descend with full-load gravity acceleration. Simultaneously, the towing motor 21 tows the transport platform 8 downhill at a speed less than its current acceleration (the initial acceleration of the transport platform 8 is greater than the output acceleration of the towing mechanism). The towing wire rope 24 unwinds, and the traction wire rope 32 rewinds, using the towing motor 21 to "restrain" the transport platform 8's descent acceleration to control its movement. The control device adjusts the speed of the tractor motor 21 via the frequency converter when the tractor platform 8 reaches the rated speed of 30 km / h, so that the tractor platform 8 is dragged down at a constant speed. When the tractor platform 8 moves down at a constant speed and passes the speed sensor 91, the current collision speed of the tractor platform 8 is measured. When the tractor platform 8 moves down and corresponds to the positioning sensor 92, the tractor motor 21 stops, so that the tractor platform 8 continues to move down at the rated collision speed and collides with the collision end.

[0041] Uphill reset condition: After the collision of the transport platform 8, the control device controls the clutch 6 to engage, starts the reset motor 51, and the reset reducer 52 drives the towing drum 23 to drive the transport platform 8 uphill at a rated speed (e.g., 3km / h) at a constant speed (at the same time, the towing motor 21 is passively reversed), returning to the initial position of the straight section at the top of the slope 12.

[0042] Downhill operation without load: When the transport platform 8 is unloaded, the control device disengages the clutch 6, starts the tractor motor 21, and drives the towing wire rope 24 to unwind and the traction wire rope 32 to wind up through the towing reducer 22, causing the transport platform 8 to move downhill. Then, the inverter increases the speed of the tractor motor 21, so that the traction wire rope 32 provides a downward positive traction force to the front of the transport platform 8, assisting the unloaded transport platform 8 to accelerate downhill; when the transport platform 8 reaches the rated impact speed (e.g., 35 km / h), the tractor motor 21 moves downhill. After h), the tractor motor 21 pulls at a constant speed through the traction drum 31; when the transport platform 8 moves down at a constant speed and corresponds with the speed sensor 91, the current speed of the transport platform 8 is measured. If there is an error, the speed of the tractor motor 21 is increased through the frequency converter to increase the traction speed of the traction drum 31, so that the transport platform 8 continues to move down at the rated collision speed; when the transport platform 8 moves down and corresponds with the positioning sensor 92, the tractor motor 21 stops, and the transport platform 8 then collides with the collision end.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention.

Claims

1. A ramp-type collision testing system, comprising a ramp, the ramp having a straight section at its top, a collision end at its bottom, and guide rails continuously arranged along the ramp and in the direction of the slope, with a transport platform moving along the guide rails; characterized in that: The straight section is provided with a dragging mechanism, a reset mechanism, a dragging drum and a traction drum on the outside. The dragging drum and the traction drum have the same diameter and are arranged in parallel. The dragging drum is located between the dragging mechanism and the reset mechanism, and the traction drum is located on the side of the dragging drum closer to the ramp. The towing mechanism includes a towing motor and a towing reducer. The input end of the towing reducer is connected to the motor shaft of the towing motor, and the output end of the towing reducer synchronously drives the towing drum and the traction drum to rotate. A towing wire rope is wound on the towing drum, and after being guided, the end of the towing wire rope is connected to the tail of the transport platform. A traction wire rope is wound on the traction drum, and after being guided, the end of the traction wire rope is connected to the front of the transport platform. The reset mechanism includes a reset motor and a reset reducer. The input end of the reset reducer is connected to the motor shaft of the reset motor, and the output end of the reset reducer is connected to the drag drum via a clutch. Both the tractor motor and the reset motor are variable frequency motors; brakes are installed on the motor shafts of both the tractor motor and the reset motor; a speed sensor and a positioning sensor are installed at the bottom of the ramp, and the positioning sensor is close to the collision end. The system also includes a control device, which is electrically connected to the tractor motor, reset motor, clutch, brake, speed sensor and positioning sensor respectively.

2. The system according to claim 1, characterized in that: Two drag wire ropes are wound side by side on the drag drum, and one traction wire rope is wound side by side on the traction drum.

3. The system according to claim 2, characterized in that: The output end of the drag reducer is connected to the traction drum via a ball chain.

4. The system according to claim 1 or 2, characterized in that: The front of the transport platform is provided with a first guide pulley, and the bottom, top and straight sections of the ramp are provided with a number of second guide pulleys. The traction steel wire rope passes around the second guide pulleys in sequence and is connected to the first guide pulley. The rear of the transport platform is provided with a third guide pulley, and the straight sections are provided with a number of fourth guide pulleys arranged side by side. The towing steel wire rope passes around the fourth guide pulleys and is connected to the third guide pulley.

5. The system according to claim 1, characterized in that: A disc brake is also provided on the side of the drag drum.

6. The system according to claim 1, characterized in that: The transport platform is a test vehicle, which is mounted on the guide rail via rollers at its bottom.

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