Active brake device for a crash test rig

Abstract

The utility model discloses a kind of active brake devices of collision test bench, including driving device, bearing support, separable bearing platform and control module, the front part of bearing support is transversely provided with mounting, buffer is provided on the mounting, the buffer includes proportional servo valve, inlet solenoid valve, outlet solenoid valve, pressure stabilizing tank and three speed reduction cylinders, the end of the piston rod of speed reduction cylinder is jointly connected with a speed reduction plate, the inlet solenoid valve, outlet solenoid valve, speed reduction cylinder are communicated with pressure stabilizing tank respectively, one end of proportional servo valve is connected with gas source, the other end is connected with inlet solenoid valve, before test starts, control module calculates required gas pressure value according to preset speed and known parameter, drive proportional servo valve to fill into gas to pressure stabilizing tank, establish gas pressure in pressure stabilizing tank to the set value, ensure that buffer provides stable resistance in active deceleration process, to reach better buffering effect.

Description

Technical Field

[0001] This utility model relates to the field of collision testing equipment, and in particular to an active braking device for a collision testing bench. Background Technology

[0002] According to national standards GB 6675.2-2025, GB / T 14749-2025, and GB 6675.12-2014, in the dynamic strength and collision test of wheeled toys, toy scooters, baby walkers, and other products, the tested sample bears a specified load and impacts a non-elastic step or plywood at a specified speed. After the impact, the tested sample must still meet the requirements of other clauses of the standard. The purpose is to protect the personal safety of children to the greatest extent and prevent accidental injuries caused by product structural failure. It is a very important test item in the standard.

[0003] In current collision testing, for testing equipment that uses a carrier platform to transport the test sample, and drives the carrier platform and the test sample to a predetermined speed through a servo motor, the test sample detaches from the carrier platform due to inertia and independently impacts the impact table to complete the collision test, the carrier platform is buffered and decelerated by the action of a fixed buffer. This fixed buffer is basically a combination of rubber, springs and other materials, which causes relatively large mechanical damage to the test equipment during deceleration, and the carrier platform will basically rebound.

[0004] In crash tests, if different speed requirements need to be met, fixed buffers cannot provide different resistance to speed changes in order to achieve a good deceleration effect, and cannot achieve smooth and linear deceleration. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide an active braking device for a collision test bench.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: an active braking device for a collision test bench, comprising a drive device, a support bracket, a separable support platform, and a control module. A mounting component is laterally arranged at the front of the support bracket, and a buffer is mounted on the mounting component. The buffer includes a proportional servo valve, an inlet solenoid valve, an outlet solenoid valve, a pressure stabilizing tank, and several deceleration cylinders. The proportional servo valve, inlet solenoid valve, outlet solenoid valve, and pressure stabilizing tank are located on the front side of the mounting component, and the deceleration cylinders are located on the top of the mounting component. The piston rods of the deceleration cylinders face the rear of the support bracket, and the ends of the piston rods of the deceleration cylinders are connected to a deceleration plate located on the movement path of the separable support platform. The inlet solenoid valve, outlet solenoid valve, and deceleration cylinders are respectively connected to the pressure stabilizing tank. One end of the proportional servo valve is connected to a pressure source, and the other end is connected to the inlet solenoid valve. The drive device is used to control the impact speed of the separable support platform, and the control module is capable of calculating the gas pressure required by the buffer.

[0007] Furthermore, a collision termination sensor is provided on one side of the front of the support bracket, and the position of the collision termination sensor on the support bracket can be adjusted back and forth.

[0008] Furthermore, the support bracket on the side where the collision end sensor is installed is recessed inward to form a sliding groove. The sliding groove consists of an inner groove and an outer groove, with the inner groove being wider than the outer groove. The collision end sensor is installed on the sensor bracket, which is equipped with a locking device. The sensor bracket is installed on the sliding groove via the locking device.

[0009] Furthermore, the locking component includes a locking screw and a locking nut. The bottom of the locking screw is provided with a slider, which is placed in the inner groove. The sensor bracket is provided with a locking port, through which the locking screw passes. The locking nut is threadedly connected to the outer locking screw.

[0010] Furthermore, the upper surface of the detachable bearing platform is not lower than the top of the deceleration plate.

[0011] Furthermore, the support bracket is also equipped with a pushing device and a separation sensor, and the driving device includes a servo motor.

[0012] This utility model includes at least one of the following beneficial effects: 1. The detachable bearing platform is driven by a drive device to impact the buffer at a near-preset speed. Both its mass and the preset speed are constant. The detachable bearing platform decelerates in an approximately uniform manner. The deceleration stroke (i.e., cylinder stroke) is known. Based on the velocity-displacement formula, the deceleration *a* can be calculated. According to Newton's second law, F=m·a, the force *F* required for the entire deceleration process can be calculated. According to Newton's third law, the buffer only needs to provide a force of the opposite direction and the same magnitude during deceleration to provide braking force for the detachable bearing platform, achieving a smooth, near-linear deceleration effect. Since the piston area of ​​each deceleration cylinder is a fixed parameter, the required gas pressure for the buffer can be calculated using the pressure formula. 1. The control module can perform the above calculations before the collision, drive the proportional servo valve to fill the pressure tank with gas, and establish the gas pressure in the pressure tank to the set value, thereby ensuring that the buffer has a better buffering effect; 2. An adjustable collision end sensor is set up, which can send an "open" signal to the exhaust solenoid valve in advance at a very small distance before the piston reaches the physical end point. This is used to compensate for the response lag of the exhaust solenoid valve and the time of gas depressurization, so that when the piston reaches the physical end point, the exhaust solenoid valve is also fully open, and the high-pressure gas in the sealed air chamber is released, avoiding the rebound of the separable bearing platform; 3. The deceleration plate impacts the separable bearing platform with its surface, which can disperse the stress on the separable bearing platform during the impact and avoid damage to the separable bearing platform. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0014] Figure 2 This is a schematic diagram of a buffer.

[0015] Figure 3 This is a cross-sectional view of the support frame.

[0016] In the diagram: 1. Support bracket; 11. Sliding groove; 111. Inner groove; 112. Outer groove; 12. Mounting component; 21. Servo motor; 22. Drive wheel; 23. Driven wheel; 24. Drive chain; 3. Buffer; 31. Pressure stabilizing tank; 32. Reduction cylinder; 33. Inlet solenoid valve; 34. Outlet solenoid valve; 35. Proportional servo valve; 36. Speed ​​reducer; 4. Pushing device; 5. Separable support platform; 6. Impact platform; 7. Collision termination sensor; 71. Sensor bracket; 72. Locking component; 721. Locking screw; 722. Locking nut; 723. Slider; 8. Separation sensor. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Example: An active braking device for a collision test bench includes a drive unit, a support bracket 1, a detachable support platform 5, and a control module. A mounting component 12 is laterally arranged at the front of the support bracket 1, and a buffer 3 is mounted on the mounting component. The drive unit controls the detachable support platform 5 to move on the support bracket 1 at a preset speed. The buffer 3 includes a proportional servo valve 35, an inlet solenoid valve 33, an outlet solenoid valve 34, a pressure stabilizing tank 31, and three reduction cylinders 32. The control module can calculate the required gas pressure value by combining the preset speed with known parameters (the stroke of the reduction cylinder 32 and the piston area of ​​the three reduction cylinders 32). The proportional servo valve 35, the inlet solenoid valve 33, and the outlet solenoid valve... 34. The pressure stabilizing tank 31 is located on the front side of the mounting component 12, and the deceleration cylinder 32 is located on the top of the mounting component 12. The piston rod of the deceleration cylinder 32 faces the rear of the bearing bracket 1. The end of the piston rod of the deceleration cylinder 32 is connected to a deceleration plate 36. The deceleration plate 36 is located on the movement path of the separable bearing platform 5. When the impact test is performed, the deceleration plate 36 intercepts the separable bearing platform 5, causing the test sample above the separable bearing platform 5 to continue moving forward due to inertia and impacting the impact table 6 for impact test. The inlet solenoid valve 33, the outlet solenoid valve 34, and the deceleration cylinder 32 are respectively connected to the pressure stabilizing tank 31. One end of the proportional servo valve 35 is connected to the air pressure source, and the other end is connected to the inlet solenoid valve 33. Before the test begins, the calculated required gas pressure is injected into the pressure stabilizing tank 31 through the proportional servo valve 35, and then enters each reduction cylinder 32 through three parallel pipes, pushing the piston out. During the test, the piston begins to retract under the impact force, and the large cavity of the pressure stabilizing tank 31 transforms the pressure impact caused by the retraction of the reduction cylinder 32 into a mild and controllable pressure increment. After the test ends, the gas outlet solenoid valve 34 releases the gas pressure.

[0019] Furthermore, a collision end sensor 7 is provided on the front side of the support bracket 1. The position of the collision end sensor 7 on the support bracket 1 can be adjusted back and forth. The collision end sensor 7 can be adjusted to a very small distance position before the piston reaches the physical endpoint. The control module sends an "open" signal to the exhaust solenoid valve in advance to compensate for the response lag of the exhaust solenoid valve 34 and the time of gas depressurization. This ensures that when the piston reaches the physical endpoint, the exhaust solenoid valve 34 is also fully open, the high-pressure gas in the sealed air chamber is released, and the pressure drops rapidly to prevent the separable support platform 5 from rebounding.

[0020] Furthermore, the support bracket 1 on the side where the collision termination sensor 7 is installed is recessed inward to form a sliding groove 11. The sliding groove 11 consists of an inner groove 111 and an outer groove 112, with the inner groove 111 being wider than the outer groove 112. The collision termination sensor 7 is mounted on a sensor bracket 71, and a locking member 72 is provided on the sensor bracket 71. The sensor bracket 71 is mounted on the sliding groove 11 via the locking member 72. The locking member 72 includes a locking screw 721 and a locking nut 722. A slider 723 is provided at the bottom of the locking screw 721. The slider 723 is placed in the inner groove 111. The position of the collision termination sensor 7 is adjusted by the slider 723. A locking port is provided on the sensor bracket 71. The locking screw 721 passes through the locking port. The locking nut 722 is threaded onto the outer locking screw 721. After the collision termination sensor is in the appropriate position, the locking nut 722 is turned, and the sensor bracket 71 is clamped by the slider 723 and the locking nut 722.

[0021] Furthermore, the upper surface of the separable support platform 5 is not lower than the top of the deceleration plate 36, which can prevent the deceleration plate from affecting the test sample placed on the upper surface of the support platform 5.

[0022] Furthermore, the support bracket also integrates a pushing device 4 and a separation sensor 8. The driving device in this embodiment includes a servo motor 21, a drive wheel 22, a driven wheel 23, and a drive chain 24 tensioned thereon. The drive chain 23 is fixedly connected to the pushing device 4, which directly transmits linear motion to the detachable support platform 5. When the pushing device 4 pushes the detachable support platform past the separation sensor 8, the driving device controls the pushing device 3 to decelerate, allowing the detachable support platform 5 to detach from the pushing device 4 and continue moving forward by inertia.

[0023] The working principle of this utility model is as follows: By presetting the operating parameters of the servo motor 41 through the control module, the moving speed of the separable support platform 5 can be controlled. The separation sensor 8 is used to control the deceleration of the pushing device 4, causing the separable support platform 5 to separate from the pushing device 4. The separable support platform 5 carries the test sample and slides inertia until it hits the deceleration plate 36. Since the distance from which the separable support platform 5 slides inertia to contact the deceleration plate 36 is short and very close to the preset moving speed, the deceleration can be calculated using the preset speed. The mass m of the separable support platform 5 itself is fixed and known. The moving speed v0 of the separable support platform 5 is set by the control module. The stroke s of the deceleration cylinder 32 is fixed and known. According to the velocity-displacement formula... The deceleration *a* of the separable bearing platform 5 until it comes into contact with the deceleration plate 36 and stops (i.e., v1=0) can be calculated. According to Newton's second law F=m·a and Newton's third law, it can be calculated that throughout the deceleration process, the buffer 3 needs to continuously provide a force *F* of the same magnitude and in the opposite direction. Since the sum of the piston areas of the three deceleration cylinders 32 is a fixed parameter *A*, according to the pressure formula... The required gas pressure P to be maintained inside the buffer is calculated. After calculating the required gas pressure P inside the buffer, the control module performs the following operations before the collision test: First, it controls the inlet solenoid valve to open and the outlet solenoid valve to close; simultaneously, under the command of the control module, the proportional servo valve 35 precisely controls the gas flow into the pressure stabilizing tank 31, thereby establishing the required gas pressure P in the pressure stabilizing tank 31, so that the buffer 3 can obtain a good buffering effect. The stabilizing gas enters each deceleration cylinder 32 through three parallel pipes, pushing the piston out to complete the system preset; when the test starts, the inlet solenoid valve 33 closes, sealing the gas already filled into the pressure stabilizing tank 31, forming a stable gas path. When the separable platform 5 moves to the collision start position, the active braking deceleration is triggered, and the piston of the deceleration cylinder 32 begins to retract under the impact force, pushing the gas in its cavity back into the pressure stabilizing tank 31. At this time, the large cavity of the pressure stabilizing tank 31 will transform the pressure impact caused by the cylinder retraction into a mild and controllable pressure increment. When the separable platform moves to the end-collision position sensor 7, the end-collision position sensor sends a signal, and the control module immediately opens the exhaust solenoid valve 34 to quickly discharge the high-pressure gas in the pressure tank 31 and the air circuit, depressurize the system, prevent the separable platform from rebounding, and end the active braking process.

Claims

1. A collision test bench active braking device, comprising a driving device, a bearing support, a separable bearing platform and a control module, a mounting member is arranged transversely on the front part of the bearing support, and a bumper is arranged on the mounting member, characterized in that The buffer includes a proportional servo valve, an inlet solenoid valve, an outlet solenoid valve, a pressure stabilizing tank, and several deceleration cylinders. The proportional servo valve, inlet solenoid valve, outlet solenoid valve, and pressure stabilizing tank are located on the front side of the mounting component, while the deceleration cylinders are located on the top of the mounting component. The piston rods of the deceleration cylinders face the rear of the support bracket, and the ends of the piston rods of the deceleration cylinders are connected to a deceleration plate located on the movement path of the separable support platform. The inlet solenoid valve, outlet solenoid valve, and deceleration cylinders are each connected to the pressure stabilizing tank. One end of the proportional servo valve is connected to a pressure source, and the other end is connected to the inlet solenoid valve. The drive device is used to control the impact speed of the separable support platform, and the control module can calculate the gas pressure required by the buffer.

2. A crash test sled active braking apparatus as defined in claim 1, wherein A collision termination sensor is provided on one side of the front of the support bracket, and the position of the collision termination sensor on the support bracket can be adjusted back and forth.

3. A crash test rig active brake apparatus according to claim 2, characterised in that The support bracket on the side where the collision end sensor is installed is recessed inward to form a sliding groove. The sliding groove consists of an inner groove and an outer groove, with the inner groove being wider than the outer groove. The collision end sensor is installed on the sensor bracket, which is equipped with a locking device. The sensor bracket is installed on the sliding groove via the locking device.

4. A crash test rig active brake apparatus according to claim 3, characterised in that The locking component includes a locking screw and a locking nut. The bottom of the locking screw is provided with a slider, which is placed in the inner groove. The sensor bracket is provided with a locking port, through which the locking screw passes. The locking nut is threaded onto the outer locking screw.

5. The active brake device for a crash test machine according to claim 1, wherein The upper surface of the detachable bearing platform is not lower than the top of the deceleration plate.

6. The active brake device for a crash test machine according to claim 1, wherein The support bracket is also equipped with a pushing device and a separation sensor, and the driving device includes a servo motor.

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