A brake caliper unit fatigue test device and method for simulating braking torque

Abstract

The application discloses a kind of brake clamp unit fatigue test device and method of simulated braking torque, comprising: base;Base is equipped with support seat and is used to install the mounting bracket of brake clamp unit;Rotary lever, hinged and equipped in support seat;Push cylinder, hinged and equipped between one end of rotary lever and base;A pair of clamping plates, equipped in the other end of rotary lever, clamping plate is connected with brake clamp unit by friction or through force pin and is rigidly connected with brake clamp unit;Control system is used to control the push / pull force of push cylinder and calculate the driving frequency of push cylinder, the stress direction under braking state is simulated by lever type reciprocating deflection push / pull force, to carry out limit fatigue test under different stress size state.The beneficial effects of the present application compared with the prior art are: simulated braking torque, more realistically simulate braking condition, realize the loading of disc friction force to brake clamp unit, and torque value can be adjusted to adapt to different test requirements.

Description

Technical Field

[0001] This invention belongs to the technical field of rail vehicle braking test equipment, specifically relating to a fatigue test device and method for a brake caliper unit that simulates braking torque. Background Technology

[0002] The brake caliper unit is the actuator that implements air braking and parking braking. It is a core component of the braking system and bogie of rail transit locomotives and rolling stock. It is a clamp-shaped device that converts air pressure (or hydraulic pressure, energy storage springs, zippers, or other forms of external force) into positive pressure between the brake pads and the brake disc.

[0003] Existing brake caliper units often obtain corresponding test values ​​based on the "braking-releasing" test action and the corresponding test data.

[0004] For example, Chinese invention patent CN106840632B discloses a testing device and method for a high-speed train brake caliper unit, which performs performance and fatigue testing on a brake caliper unit during track changing. However, its fatigue testing has significant problems. Because it uses a rotary drive and friction braking contact method to achieve fatigue testing, the tested wheel must first reach a certain speed before a braking test is completed through compression contact. This process is extremely energy-intensive. Furthermore, it primarily tests the brake pads of the brake caliper unit and cannot effectively simulate the rigid structural frame of the brake caliper itself. This results in two issues: firstly, the equipment start-up and shutdown transition time is long, energy consumption is high, and the fatigue testing cycle is too long, affecting the test progress; secondly, the fatigue testing direction is too limited and lacks representativeness. Summary of the Invention

[0005] Details of one or more embodiments of the present invention are set forth in the following drawings and description to make other features, objects and advantages of the present application more readily apparent.

[0006] A fatigue testing device for a brake caliper unit simulating braking torque, comprising:

[0007] A base; the base is provided with a support seat and a mounting bracket for mounting the brake caliper unit;

[0008] The rotating lever is hinged to the support base;

[0009] The push cylinder is hinged between one end of the rotating lever and the base;

[0010] A pair of clamping plates are provided at the other end of the rotating lever, and each of the clamping plates is used to frictionally connect with each brake pad on the brake caliper unit to be subjected to fatigue testing or to rigidly connect with each brake pad on the brake caliper unit to be subjected to fatigue testing via a force transmission pin.

[0011] The control system is used to control the magnitude of the pushing / pulling force of the push cylinder and calculate the number of times the push cylinder is driven. It simulates the force direction under braking conditions by lever-type reciprocating deflection of the pushing / pulling force, and performs limit fatigue tests on the brake caliper unit to be subjected to fatigue tests under different force conditions.

[0012] In some embodiments, the clamping plate is provided with a force transmission connection hole, and a force transmission pin is installed on the force transmission connection hole for connection with the force transmission pin hole provided on the brake pad of the brake caliper unit to be subjected to fatigue test.

[0013] In some implementations, it also includes:

[0014] There are at least two connecting pins that pass through the rotating lever between the pair of clamping plates and between the pair of clamping plates. Each end of the connecting pin is provided with a limiting retaining ring.

[0015] In some embodiments, the support base is provided with a rotating groove; the rotating lever is disposed through and hinged in the rotating groove.

[0016] In some implementations, it also includes:

[0017] An adjustment device is provided between the pair of clamping plates;

[0018] The regulating device further includes:

[0019] Upper and lower connecting plates;

[0020] The first connecting rod is hinged to both sides of the upper connecting plate;

[0021] The second connecting rod is hinged to both sides of the lower connecting plate;

[0022] The first connecting rod and the second connecting rod, located on the same side, are hinged together, and a sliding block is provided at their hinge point;

[0023] A sliding groove is provided in each of the clamping plates, so that each sliding block corresponds to each of the sliding grooves and is slidably engaged and connected.

[0024] An adjustment drive device is located between the upper connecting plate and the lower connecting plate, and is used to drive the two to adjust the distance.

[0025] In some embodiments, the adjustment drive device includes:

[0026] A threaded screw, which is rotatably connected to the lower connecting plate and threadedly connected to the upper connecting plate;

[0027] The width adjustment handwheel is located at either end of the threaded screw.

[0028] In some implementations, it also includes:

[0029] A locking shaft is provided through the pair of clamping plates, and a locking nut is provided at the threaded structure where the locking shaft connects with the clamping plates.

[0030] In some implementations, it also includes:

[0031] A sliding seat is slidably disposed on the base via a sliding drive mechanism, and the support seat is disposed on the sliding seat.

[0032] In some embodiments, the sliding drive mechanism includes:

[0033] A sliding seat slide rail is provided on the base;

[0034] The sliding seat adjusting screw is located between the sliding seat and the base, and is threadedly connected to the sliding seat;

[0035] The sliding seat adjustment handwheel is located at either end of the sliding seat adjustment screw.

[0036] In some embodiments, the pusher cylinder is a hydraulic cylinder.

[0037] The present invention also discloses a test method, comprising the following steps:

[0038] The control system is used to control the magnitude of the pushing / pulling force and the speed of the pushing action of the pusher cylinder;

[0039] The control system is used to control the stroke of the push cylinder and the position of the sliding seat, so as to adjust the direction of the push / pull force between the clamping plate and the brake pad;

[0040] The control system is used to control the braking / releasing time and braking clamping force of the brake caliper unit;

[0041] The control system is used to set the application time of the braking torque, the single application time of the fatigue test, the total number of cycles, and to record the current fatigue cycle count.

[0042] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0043] The lever principle is used to achieve rapid and stable constant force output, ensuring that the magnitude of the output force is consistent each time, making the test data more accurate and reliable. At the same time, the magnitude of the output force can be adjusted according to the magnitude of the cylinder push force, which can simulate various braking conditions. In addition, the lever-type deflection force method is closer to the force direction in the actual braking process.

[0044] This device can be used to perform fatigue limit simulation experiments on brake caliper units under rigid transmission, so as to conduct limit tests on the fatigue of the rigid structure of the brake caliper. It can also be used to perform fatigue limit simulation experiments on brake caliper units under friction transmission, so as to conduct limit tests on the fatigue of the brake pad structure of the brake caliper. This makes the test data more representative and covers a wider range of contents.

[0045] The system is equipped with appropriate adjustment devices to accommodate brake caliper units of different sizes for testing, and can also simulate fatigue tests under different disc wear conditions.

[0046] The entire test bench is low-carbon and environmentally friendly, with low energy consumption and low noise. Compared with the rotary fatigue test bench, it can achieve dust-free and odorless operation and greatly shorten the test period. Attached Figure Description

[0047] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0048] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0049] Figure 2 This is a schematic diagram of the rotating lever of the present invention.

[0050] Figure 3 This is a three-dimensional structural diagram of the adjusting device of the present invention.

[0051] Figure 4 This is a three-dimensional structural diagram of the upper and lower connecting plates of the present invention.

[0052] Figure 5 This is a three-dimensional structural diagram of the dovetail guide tenon of the present invention.

[0053] Figure 6 This is a flowchart of the experimental steps of the present invention.

[0054] Figure description: Base 1, sliding seat 2, support seat 3, rotating groove 4, rotating lever 5, push cylinder 6, connecting pin 7, clamping plate 8, sliding groove 9, upper connecting plate 10, lower connecting plate 11, first connecting rod 12, second connecting rod 13, threaded screw 14, sliding block 15, locking shaft 16, locking nut 17, width adjusting handwheel 18, brake caliper 19, clamping arm 20, dovetail guide tenon 21, brake pad 22, force transmission pin hole 23, sliding seat slide rail 24, sliding seat adjusting screw 25, sliding seat adjusting handwheel 26, force transmission connecting hole 34. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments provided by this invention without inventive effort are within the scope of protection of this invention.

[0056] Obviously, the accompanying drawings described below are merely some examples or embodiments of the present invention. Those skilled in the art can apply the present invention to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this invention, modifications to design, manufacturing, or production based on the technical content disclosed in this invention are merely conventional technical means and should not be construed as insufficient disclosure of the present invention.

[0057] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention may be combined with other embodiments without conflict.

[0058] This invention discloses a fatigue testing device for a brake caliper unit that simulates the braking torque of a rigid transmission, comprising: a base 1, a rotating lever 5, a push cylinder 6, a pair of clamping plates 8, and a control system; the base 1 is provided with a support seat 3 and a mounting bracket for mounting the brake caliper unit; the rotating lever 5 is hinged to the support seat 3; the push cylinder 6 is hinged between one end of the rotating lever 5 and the base 1; a pair of clamping plates 8 are provided at the other end of the rotating lever 5, and each clamping plate 8 is provided with a force transmission connection hole 34, which is connected to the force transmission pin hole 23 of the brake pad 22 of the brake caliper unit to be fatigue tested by installing a force transmission pin; the control system is used to control the magnitude of the pushing / pulling force of the push cylinder 6 and calculate the number of times the push cylinder 6 is driven, simulate the force direction under braking state by lever reciprocating deflection of the pushing / pulling force, and conduct limit fatigue tests on the brake caliper unit to be fatigue tested under different force magnitudes under rigid transmission.

[0059] The brake caliper unit includes: brake caliper 19, clamping arm 20, dovetail guide tenon 21, and brake pad 22; the brake caliper 19 has clamping arms 20 at both ends, and corresponding brake pads 22 are installed at the clamping arms 20. During the installation test, the brake pads 22 can be quickly connected or replaced with the corresponding slots on the clamping arms 20 through the dovetail guide tenons 21 on the brake pads 22, thereby realizing the replacement of different brake pads 22.

[0060] During the fatigue simulation experiment, the force is transmitted through the force transmission pin, and the force is directly transmitted to the clamping arm 20 of the brake caliper 19. This achieves direct fatigue detection simulation of the rigid structure, so that the force loss caused by the relative friction coefficient between the clamping plate 8 and the brake pad 22 can be eliminated, making the detection more accurate and direct.

[0061] This invention also discloses a fatigue testing device for a brake caliper unit that simulates friction-driven braking torque, comprising: a base 1, a rotating lever 5, a push cylinder 6, a pair of clamping plates 8, and a control system; the base 1 is provided with a support seat 3 and a mounting bracket for mounting the brake caliper unit; the rotating lever 5 is hinged to the support seat 3; the push cylinder 6 is hinged between one end of the rotating lever 5 and the base 1; a pair of clamping plates 8 are provided at the other end of the rotating lever 5, and each clamping plate 8 is used to abut against each brake pad 22 on the brake caliper unit to be subjected to fatigue testing; the control system is used to control the magnitude of the pushing / pulling force of the push cylinder 6 and calculate the number of times the push cylinder 6 is driven, simulate the force direction under braking state through lever reciprocating deflection force, and conduct limit fatigue tests on the brake caliper unit to be subjected to fatigue testing under different force magnitudes under friction transmission.

[0062] The structure of friction transmission is roughly the same as that of rigid transmission, except that the way force is transmitted is changed. In the process of friction transmission, the corresponding fatigue detection simulation is achieved through the frictional contact between the clamping plate 8 and the brake pad 22.

[0063] In the above simulation process, regardless of whether rigid transmission or friction transmission is used, the force is driven by levers. Different pushing / pulling forces are applied by controlling the hydraulic cylinder 6. Preferably, the pushing cylinder 6 is a hydraulic cylinder. To simulate different working conditions, it should be noted that this method, compared to rotational simulation, has a faster response and adjustment, maintains more precise and accurate pushing / pulling force for each operation, and consumes less energy.

[0064] Furthermore, based on the above embodiment, the support base 3 is provided with a rotating groove 4; the rotating lever 5 is disposed through and hinged in the rotating groove 4. The structural design of the rotating groove 4 makes the application of force more stable and balanced during the lever's operation.

[0065] Furthermore, based on the above embodiments, a connecting pin 7 can be provided. There are at least two connecting pins 7, which are disposed through the pair of clamping plates 8. Both ends of the connecting pin 7 are provided with limiting rings.

[0066] The connecting pin 7 not only serves as an installation connection, but also as a sliding guide, allowing the clamping plates 8 to slide between each other via the connecting pin 7. This enables the testing of brake caliper units of different specifications and sizes, or the simulation of fatigue tests under different disc wear levels.

[0067] The specific clamping plates 8 are adjusted by an adjustment device. The adjustment device includes: an upper connecting plate 10, a lower connecting plate 11, a first connecting rod 12, a second connecting rod 13, a sliding groove 9, and an adjustment drive device; the first connecting rod 12 is hinged to both sides of the upper connecting plate 10; the second connecting rod 13 is hinged to both sides of the lower connecting plate 11; the first connecting rod 12 and the second connecting rod 13 on the same side are hinged together, and a sliding block 15 is provided at their hinge point; the sliding groove 9 is provided in each clamping plate 8, so that each sliding block 15 corresponds to each sliding groove 9 and is slidably engaged; the adjustment drive device is provided between the upper connecting plate 10 and the lower connecting plate 11, and is used to drive the two to adjust the distance.

[0068] The adjustment drive device includes a threaded screw 14 and a width adjustment handwheel 18. The threaded screw 14 is rotatably connected to the lower connecting plate 11 and threadedly connected to the upper connecting plate 10. The width adjustment handwheel 18 is located at either end of the threaded screw 14. By rotating the width adjustment handwheel 18, the threaded screw 14 is rotated, causing relative displacement between the upper connecting plate 10 and the lower connecting plate 11, thereby adjusting the width between the clamping plates 8. The screw structure is used to support and lock the clamping plates 8, ensuring that the clamping plates 8 will not shift during the experiment when the brake clamping unit is clamping.

[0069] Furthermore, in addition to the above structure, a locking shaft 16 is provided. The locking shaft 16 passes through the rotating lever 5 between the pair of clamping plates 8 and between the pair of clamping plates 8, and a locking nut 17 is provided at the threaded structure where the locking shaft 16 connects with the clamping plate 8. The locking nut 17 further locks the position of the clamping plate 8.

[0070] Furthermore, based on the above embodiments, it may also include: a sliding seat 2, which is slidably disposed on the base 1 via a sliding drive mechanism, and the support seat 3 is disposed on the sliding seat 2. The sliding drive mechanism includes: a sliding seat slide rail 24, a sliding seat adjusting screw 25, and a sliding seat adjusting handwheel 26; the sliding seat slide rail 24 is disposed on the base 1; the sliding seat adjusting screw 25 is disposed between the sliding seat 2 and the base 1 and is threadedly connected to the sliding seat 2; the sliding seat adjusting handwheel 26 is disposed at either end of the sliding seat adjusting screw 25.

[0071] The relative position of the sliding seat 2 can be adjusted by adjusting the sliding seat adjustment handwheel 26, thereby better adjusting the distance between the brake caliper unit under test and the clamping plate 8.

[0072] A fatigue test method for a brake caliper unit simulating braking torque involves fixing the brake caliper unit to be tested on a base 1. The horizontal position of a pair of clamping plates 8 is adjusted so that the brake caliper unit can clamp onto the clamping plates 8 during clamping action. The distance between the pair of clamping plates 8 is adjusted according to the test conditions and specific circumstances. At the start of the test, the brake caliper unit clamps the clamping plates 8, and the drive cylinder 6 outputs the corresponding push / pull force and number of retractions according to the control system commands, performing an ultimate fatigue test under this condition.

[0073] During the above-mentioned test, rigid transmission or friction transmission can be selected according to the requirements.

[0074] The specific experimental procedures are as follows: Figure 6First, based on the required operating conditions of the test, select and set the appropriate pushing / pulling force of the push cylinder 6, the direction of the pushing / pulling force of the push cylinder 6 (adjusted according to the position of the sliding seat 2 and the stroke of the push cylinder 6), the pushing / retracting speed of the push cylinder 6, the braking clamping force of the brake caliper unit, the single cycle period, and the spacing between the clamping plates 8, etc.; then, start the test, the brake caliper unit operates to brake and clamp the clamping plates 8, the push cylinder 6 does work to generate braking torque, the push cylinder stops, the brake caliper unit operates to release and loosen the clamping plates 8, the push cylinder 6 resets, at this time it is counted as one, and then repeat the above operation to conduct fatigue test.

[0075] Furthermore, multiple fatigue testing devices can be set up simultaneously, each equipped with a corresponding hydraulic station. The hydraulic station is connected to the push cylinder 6 in each fatigue testing device via a push cylinder hose to provide hydraulic pressure to the push cylinder. The overall control integration system is then used for individual debugging, thereby shortening the test cycle and improving test efficiency.

[0076] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A brake caliper unit fatigue test device that simulates braking torque, characterized by, It comprises: a base; a support seat and a mounting frame for mounting a brake caliper unit are arranged on the base; a rotating lever is hingedly arranged on the support seat; a push cylinder is hingedly arranged between one end of the rotating lever and the base; a pair of clamping plates are arranged on the other end of the rotating lever, and each clamping plate is used for frictionally connecting or rigidly connecting each brake pad of the brake caliper unit to be subjected to fatigue test through a force transmission pin; a control system is used for controlling the push / pull force of the push cylinder and calculating the driving times of the push cylinder, simulating the force direction under the brake state by the lever type reciprocating deflection push / pull force, and performing the limit fatigue test of the brake caliper unit to be subjected to fatigue test under different force size states.

2. The brake caliper unit fatigue test apparatus according to claim 1, characterized by A force transmission connecting hole is arranged on the clamping plate, and a force transmission pin is arranged on the force transmission connecting hole and used for connecting with a force transmission pin hole arranged on the brake pad of the brake caliper unit to be subjected to fatigue test.

3. The brake caliper unit fatigue test apparatus according to claim 1, characterized by It further comprises: at least two connecting pins are arranged and penetrate the pair of clamping plates and the rotating lever between the pair of clamping plates, and limit clamping rings are arranged at both ends of the connecting pins.

4. The brake caliper unit fatigue test apparatus according to claim 1, characterized by A rotating groove is arranged on the support seat, and the rotating lever penetrates and is hingedly arranged in the rotating groove.

5. The brake caliper unit fatigue test apparatus according to claim 1, characterized by It further comprises: an adjusting device is arranged between the pair of clamping plates; the adjusting device further comprises: an upper connecting plate and a lower connecting plate; first connecting rods are hingedly arranged on both sides of the upper connecting plate; second connecting rods are hingedly arranged on both sides of the lower connecting plate; the first connecting rods and the second connecting rods on the same side are hingedly connected, and a sliding block is arranged at the hinged connection; a sliding groove is arranged in each clamping plate, so that each sliding block corresponds to each sliding groove and is slidingly clamped and connected; an adjusting driving device is arranged between the upper connecting plate and the lower connecting plate, and is used for driving the distance adjustment of the upper connecting plate and the lower connecting plate.

6. The brake caliper unit fatigue test apparatus according to claim 5, characterized in that, The adjusting driving device comprises: a threaded screw rod, which is rotationally connected with the lower connecting plate and is threadedly connected with the upper connecting plate; a width adjusting hand wheel is arranged at either end of the threaded screw rod.

7. The brake caliper unit fatigue test apparatus according to claim 5, characterized by It further comprises: a locking shaft, which penetrates and is arranged between the pair of clamping plates, and a locking nut is arranged at the threaded structure at the joint of the locking shaft and the clamping plate.

8. The brake caliper unit fatigue test apparatus according to claim 1, characterized by It further comprises: a sliding seat, which is slidingly arranged on the base through a sliding driving mechanism, and the support seat is arranged on the sliding seat.

9. The brake caliper unit fatigue test apparatus according to claim 8, characterized in that, The sliding driving mechanism comprises: a sliding seat sliding rail is arranged on the base; a sliding seat adjusting screw shaft is arranged between the sliding seat and the base, and is threadedly connected with the sliding seat; a sliding seat adjusting hand wheel is arranged at either end of the sliding seat adjusting screw shaft.

10. The test method of the brake caliper unit fatigue test device according to claim 8, characterized by, It comprises the following steps: controlling the push / pull force and the pushing action speed of the push cylinder through the control system; controlling the stroke size of the push cylinder and the position of the sliding seat through the control system to adjust the push / pull force direction between the clamping plate and the brake pad; controlling the brake / relief action time and the brake clamping force of the brake caliper unit through the control system; The control system is used to set the action time of the brake torque, the single action time of the fatigue test, the total number of cycles, and the number of cycles of the current fatigue is recorded.

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