A brake stiffness automatic detection system and method for production assembly line

Abstract

The present invention proposes a brake stiffness automatic detection system and method for a production assembly line, which belongs to the technical field of vehicle brake stiffness detection. The system includes: a production line automation controller which is respectively connected to a brake assembly fixing device, a brake drum fixing device, a brake precision installation device, a strain sensing collection device, a braking force input device, a strain signal collection and processing device, and a brake sample transmission device; the production line automation controller is used to control the strain sensing collection device to disengage from the brake to be detected when the judgment result is that the stiffness of the brake to be detected does not meet the requirements, and control the brake sample transmission device to transmit the brake assembly to be detected to the return line inspection area, and output the information of the parts with unqualified stiffness. The present invention has a high degree of automation, can meet the production rhythm of the enterprise production line, saves labor resources, and has high feasibility in the production field.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle brake stiffness detection, and more particularly to an automatic brake stiffness detection system and method for a production assembly line. Background Art

[0002] As the main actuator of vehicle braking performance, the reliability of brake performance directly affects the braking performance and driving safety of the vehicle. In the field of commercial vehicles, since the use scenarios and working conditions of commercial vehicles are more severe than those of passenger vehicles, they require greater braking torque to achieve vehicle braking, which puts higher requirements on the stiffness of commercial vehicle brakes.

[0003] However, the main methods for testing the stiffness of the brake assembly are: 1. Using the elastic stroke of the air chamber push rod to measure the overall stiffness of the brake assembly; 2. Using a dial indicator to measure the deformation at specific positions of the brake assembly components.

[0004] These two detection methods have the following problems: First, the brake stiffness measured by method one, which uses the elastic stroke of the air chamber push rod to equate the overall stiffness of the brake assembly, has a large error compared with the actual stiffness; Second, method two is greatly restricted by the structure of the brake assembly. Taking the drum brake as an example, due to its semi-enclosed assembly structure, the dial indicator can only measure the deformation at specific positions of the brake drum and brake base plate, and it is impossible to understand the stiffness of the internal components of the brake assembly, including the corresponding stiffness on the brake shoe-brake drum contact surface, which is of great reference significance for brake design work.

[0005] In addition, the existing stiffness detection method can only be performed on the entire bridge, which is a passive detection means and method. It is impossible to perform stiffness detection of the brake assembly before the brake assembly is assembled on the axle to ensure that each brake assembly assembled on the axle has sufficient stiffness to ensure that the vehicle has sufficient braking performance and reliability. The above problem makes it impossible to know whether the stiffness of the brake assembly to be produced or assembled meets the requirements before the brake is produced and assembled. Summary of the invention

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a brake stiffness automatic detection system and method for a production assembly line, which has a high degree of automation, can meet the production rhythm of the enterprise's production line, save labor resources, and has high feasibility in the production field.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0008] A brake stiffness automatic detection system for a production assembly line, comprising: a brake assembly fixing device, a brake drum fixing device, a brake precision installation device, a strain sensing and collecting device, a braking force input device, a strain signal collecting and processing device, a brake sample transmission device and a production line automation controller; the production line automation controller is respectively connected to the brake assembly fixing device, the brake drum fixing device, the brake precision installation device, the strain sensing and collecting device, the braking force input device, the strain signal collecting and processing device and the brake sample transmission device by signal; the brake assembly fixing device is used to transmit the brake assembly to be detected to the assembly area on the detection assembly line; the brake drum fixing device is used to transmit the brake drum to be detected to the assembly area on the detection assembly line; the brake precision installation device is used to transmit the brake assembly to be detected in the assembly area according to the programmed command of the production line automation controller The brake assembly and the brake drum to be tested are assembled into the brake to be tested; a strain sensing and collecting device is used to fit on the preset strain collection point of the brake to be tested, collect the strain signal of the corresponding measuring point, and send it to the strain signal collecting and processing device; a braking force input device is used to connect with the brake to be tested according to the programmed command of the production line automation controller, and load the air chamber push rod force to the brake to be tested; the strain signal collecting and processing device is used to compare the strain signal with the stiffness threshold at the preset strain collection point, and input the judgment result to the production line automation controller; the production line automation controller is used to control the strain sensing and collecting device to disengage from the brake to be tested when the judgment result is that the stiffness of the brake to be tested does not meet the requirements, and control the brake sample transmission device to transmit the brake assembly to be tested to the return line inspection area, and output the information of the parts with unqualified stiffness.

[0009] Furthermore, a plurality of position sensors are provided on the brake assembly fixing device and the brake drum fixing device, and the position sensors are connected to the production line automation controller by signal. The assembly relationship between the brake assembly to be tested and the brake drum to be tested is preset through programmed commands, and the production line automation controller transmits the corresponding adjustment command to the brake precision installation device to control the assembly position between the brake assembly fixing device and the brake drum fixing device.

[0010] Furthermore, the strain sensing and collecting device adopts a contact measurement method to collect the strain time domain response signal of the preset strain collection point and send it to the strain signal collection and processing device;

[0011] The production line automation controller is used to preset the position of the strain collection point through programmed commands according to the model and specifications of the brake to be tested, and accurately position the strain sensing and collection device according to the preset strain collection point.

[0012] Furthermore, the braking force input device is specifically used to: use an electric cylinder as a loading force output device, generate a real-time loading force signal based on the displacement of the output force application point and the magnitude of the output force, and transmit it to the strain signal collection and processing device.

[0013] Furthermore, the strain signal collection and processing device is specifically used to: receive the strain time domain response signal and the loading force real-time signal, process the collected received signal by setting the corresponding algorithm, the processed signal is consistent with the signal type of the preset signal threshold, and the processed signal is easily compared with the signal threshold, and the judgment result of whether the stiffness meets the requirements is transmitted to the production line automation controller.

[0014] Correspondingly, the present invention also discloses a brake stiffness automatic detection method for a production assembly line, comprising the following steps:

[0015] S1: Assembling the brake assembly to be tested and the brake drum to be tested into a brake to be tested;

[0016] S2: attaching the strain sensing and collecting device to the preset strain collecting point of the brake to be tested through the production line automation controller;

[0017] S3: inputting the programmed command into the production line automation controller, and connecting the braking force input device to the brake to be tested through the production line automation controller;

[0018] S4: Preliminary inspection of the installation fit between the strain sensing and acquisition device and the brake to be inspected, and generating a preliminary inspection result to be sent to the production line automation controller;

[0019] S5: The production line automation controller determines the pre-inspection result and adjusts the strain sensing and collecting device according to the determination result;

[0020] S6: According to the air chamber specifications matched with the brake to be tested, the air chamber push rod force curve corresponding to the air chamber at 0.8 MPa is input into the braking force input device for loading;

[0021] S7: The strain sensing and collecting device inputs the collected strain time domain collection signal into the strain signal collecting and processing device, and compares it with the preset stiffness threshold value of each measuring point that meets the requirements, and generates a stiffness determination result;

[0022] S8: Input the stiffness determination result into the production line automation controller, and the production line controller processes the brake to be detected according to the stiffness determination result.

[0023] Further, the step S1 comprises:

[0024] The brake assembly to be inspected and the brake drum to be inspected are respectively transferred to the assembly area on the inspection line through the brake assembly fixing device and the brake drum fixing device;

[0025] The production line automation controller performs positioning control through the position signals collected by the position sensors installed on the brake assembly fixture and the brake drum fixture, and starts the brake precision installation device to assemble the brake assembly to be tested and the brake drum to be tested into the brake to be tested according to the requirements of the drawings.

[0026] Further, the step S4 comprises:

[0027] Preloading is performed by controlling the braking force input device. According to the strain signal collected by the strain signal collection and processing device, it is judged whether the strain sensing and collection device is installed in place and whether the operation of each strain measurement point channel is normal. According to the judgment result, a pre-inspection result is generated and sent to the production line automation controller.

[0028] Further, the step S5 comprises:

[0029] The production line automation controller determines the pre-inspection result according to the control algorithm set in advance; if the pre-inspection result meets the requirements, the stiffness detection test is started; if the pre-inspection result does not meet the requirements, a control signal is transmitted through the production line automation controller to start the backup strain acquisition sensing device to replace the current strain sensing acquisition device, and repeat step S4 until the pre-inspection work meets the requirements.

[0030] Further, the step S8 comprises:

[0031] When the stiffness determination result of the brake to be tested meets the requirements, the production line automation controller controls the strain sensing and collecting device to be separated from the brake to be tested, and controls the brake sample transmission device to transmit the brake to be tested with qualified stiffness to the bridge installation area for bridge installation;

[0032] When the stiffness determination result of the brake to be tested does not meet the requirements, the production line automation controller controls the strain sensing and acquisition device to separate from the brake to be tested, and controls the brake sample transmission device to transmit the brake assembly to be tested with unqualified stiffness to the return line inspection area, and outputs the information of the components with unqualified stiffness.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. From the perspective of bringing economic benefits to vehicle manufacturers, the automatic detection system and method of brake stiffness for production assembly lines proposed by the present invention make up for the lack of steps and methods for detecting the stiffness of brakes when they are currently produced off the line, resulting in the inability to accurately control the stiffness of the brakes to be installed on the bridge. The automatic detection system and method of brake stiffness for production assembly lines proposed by the present invention have a high degree of automation, can meet the production rhythm of the enterprise's production line, save labor resources, and have high feasibility in the production field. On the one hand, before the brake is assembled on the axle, the stiffness detection system can ensure that the stiffness of each brake entering the bridge installation area meets the requirements, which is conducive to greatly reducing the TCO (after-sales maintenance service) costs caused by brake failures; on the other hand, the stiffness detection system reduces the failure rate of the company's brake products, which is conducive to shaping the reliability reputation of the company's brand, thereby improving its brand influence and competitiveness in the market.

[0035] 2. From the perspective of the social benefits generated, the automatic detection system and method for brake stiffness for a production assembly line proposed by the present invention is conducive to reducing the probability of brake failure of the whole vehicle, thereby ensuring the braking safety of the vehicle, helping to reduce the risk of vehicle accidents, and safeguarding the life and property safety of the driver and other personnel, and has positive social benefits.

[0036] It can be seen that compared with the prior art, the present invention has outstanding substantive features and significant progress, and the beneficial effects of its implementation are also obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0038] Figure 1 It is a system structure diagram of a specific implementation mode of the present invention.

[0039] Figure 2 It is a system plan structure layout diagram of a specific implementation mode of the present invention.

[0040] Figure 3 It is the system working principle of the specific implementation mode of the present invention and the flow route diagram of various signals.

[0041] Figure 4 It is a system structure diagram of a specific implementation mode of the present invention.

[0042] In the figure:

[0043] 1-brake assembly to be tested; 2-brake assembly fixing device; 3-brake drum fixing device; 4-brake drum to be tested; 5-brake to be tested; 6-strain sensing and acquisition device; 7-braking force input device; 8-strain signal collection and processing device; 9-production line automation controller; 10-brake precision installation device; 11-brake sample transmission device. DETAILED DESCRIPTION

[0044] The specific implementation of the present invention is described below with reference to the accompanying drawings.

[0045] like Figure 1 The brake stiffness automatic detection system for a production assembly line shown in the figure comprises: a brake assembly fixing device 2, a brake drum fixing device 3, a brake precision installation device 10, a strain sensing and collecting device 6, a braking force input device 7, a strain signal collecting and processing device 8, a brake sample transmission device 11 and a production line automation controller 9; the production line automation controller 9 is respectively connected to the brake assembly fixing device 2, the brake drum fixing device 3, the brake precision installation device 10, the strain sensing and collecting device 6, the braking force input device 7, the strain signal collecting and processing device 8 and the brake sample transmission device 11 by signals.

[0046] The brake assembly fixing device 2 is used to transfer the brake assembly 1 to be tested to the assembly area on the testing line. The brake drum fixing device 3 is used to transfer the brake drum 4 to be tested to the assembly area on the testing line.

[0047] Specifically, a plurality of position sensors are provided on the brake assembly fixing device 2 and the brake drum fixing device 3. The position sensors are connected to the production line automation controller 9 by signal. The assembly relationship between the brake assembly 1 to be tested and the brake drum 4 to be tested is preset through programmed commands. The production line automation controller 9 transmits the corresponding adjustment command to the brake precision installation device 10 to control the assembly position between the brake assembly fixing device 2 and the brake drum fixing device 3.

[0048] The brake precision installation device 10 is used to assemble the brake assembly 1 to be tested and the brake drum 4 to be tested into the brake 5 to be tested in the assembly area according to the programmed command of the production line automation controller 9.

[0049] The strain sensing and collecting device 6 is used to fit on the preset strain collecting point of the brake 5 to be tested, collect the strain signal of the corresponding measuring point, and send it to the strain signal collecting and processing device 8.

[0050] Specifically, the strain sensing and collecting device 6 adopts a contact measurement method to collect the strain time domain response signal of the preset strain collection point and send it to the strain signal collection and processing device 8. Based on this, the production line automation controller 9 is used to preset the position of the strain collection point through programmed commands according to the model and specifications of the brake 5 to be detected, and accurately locate the strain sensing and collecting device 6 according to the preset strain collection point.

[0051] The braking force input device 7 is used to connect with the brake to be detected 5 according to the programmed command of the production line automation controller 9, and load the air chamber push rod force to the brake to be detected 5. The braking force input device 7 is specifically used to: use the electric cylinder as the output device of the loading force, generate the real-time loading force signal of the displacement of the output force point and the magnitude of the output force, and transmit it to the strain signal collection and processing device 8.

[0052] The strain signal collecting and processing device 8 is used to compare the strain signal with the stiffness threshold at the preset strain collection point, and input the judgment result to the production line automation controller 9. The strain signal collecting and processing device 8 is specifically used to: receive the strain time domain response signal and the loading force real-time signal, and process the collected received signal by setting the corresponding algorithm, so that the processed signal is consistent with the signal type of the preset signal threshold, and the processed signal is easy to compare with the signal threshold, and the judgment result of whether the stiffness meets the requirements is transmitted to the production line automation controller 9.

[0053] The production line automation controller 9 is used to control the strain sensing and collecting device 6 to disengage from the brake 5 to be tested when the judgment result is that the stiffness of the brake 5 to be tested does not meet the requirements, and control the brake sample transmission device 11 to transmit the brake assembly 1 to be tested to the return line inspection area, and output the information of the parts with unqualified stiffness at the same time.

[0054] like Figure 2-3 As shown, the specific working principle of this system is as follows:

[0055] In the figure, 101 is the product flow route of the production line, 102 is the production line control signal flow route, and 103 is the strain acquisition signal and sensor signal flow route.

[0056] First, the brake assembly 1 to be tested and the brake drum 4 to be tested are respectively transmitted to the testing line through the brake assembly fixture 2 and the brake drum fixture 3; then, they are input into the production line automation controller 9 through programmed commands, so that the brake assembly fixture 2 and the brake drum fixture 3 drive the brake 5 to be tested to enter the assembly area; the brake precision installation device 10 is used to ensure that the installation accuracy between the brake assembly 1 to be tested and the brake drum 4 to be tested meets the actual use requirements; then, they are input into the production line automation controller 9 through programmed commands, so that the braking force input device 7 and the brake 5 to be tested are automatically connected in place; according to the pre-set The position of the strain collection point on the brake 5 is input into the production line automation controller 9 through a programmed command, so that the strain collection sensing device 6 is automatically and accurately positioned at the strain collection point and achieves a tight fit. Before the stiffness test, the fit between the strain collection sensing device 6 and the brake 5 to be tested should be pre-checked, and the working condition of each measuring point channel in the strain collection sensing device 6 should be checked to see whether it is normal. The brake force input device 7 is used for pre-loading, and the signal collected by the strain signal collection and processing device 8 is used to determine whether the strain sensing collection device 6 is installed in place and whether the operation of each strain measuring point channel is normal. Then, the pre-check result is transmitted to the production line automation controller 9. According to the control algorithm set in advance, if the pre-inspection result meets the requirements, the next stiffness detection test is carried out. If the pre-inspection result does not meet the requirements, the control signal is transmitted through the production line automation controller 9, so that the spare strain collection and sensing device 6 replaces the current one, and the test pre-inspection work is repeated until the pre-inspection work meets the requirements; next, the formal stiffness detection process is entered, and according to the air chamber specifications matched by the brake 5 to be tested, the air chamber push rod force curve corresponding to the air chamber at 0.8MPa is input into the braking force input device 7 for loading, and the strain signal collected by the strain sensing and collecting device 6 is input into the strain collection and processing device 8, and the stiffness that meets the requirements of the preset measuring points is obtained. The threshold is compared and the judgment result is input into the production line automation controller 9. When the stiffness of the brake 5 to be tested meets the requirement, the production line automation controller 9 controls the strain sensing and acquisition device 6 to be separated from the brake 5 to be tested, and controls the brake sample transmission device 11 to transmit the brake assembly with qualified stiffness to the bridge installation area for bridge installation; when the stiffness of the brake 5 to be tested does not meet the requirement, the production line automation controller 9 controls the strain sensing and acquisition device 6 to be separated from the brake 5 to be tested, and controls the brake sample transmission device 11 to transmit the brake assembly with unqualified stiffness to the return line maintenance area, and outputs the information of parts with unqualified stiffness in preparation for replacement of related parts and maintenance.

[0057] It can be seen that this system has the following advantages:

[0058] First, the brake assembly and brake drum to be tested can be directly transferred to the area to be tested after they are off the production line, and the matching brake drum can be accurately assembled; second, the strain sensing device adopts a contact measurement method and can be used repeatedly, avoiding the disadvantage that the traditional strain gauge cannot be reused after being pasted. At the same time, a spare strain sensing acquisition device is set to ensure the normal operation of the detection system of the entire production line and the production rhythm; third, the measuring point position of the strain sensing device can realize the precise positioning of multiple measuring points according to programming; fourth, the strain sensing acquisition device can realize the automatic zeroing processing of the initial strain signal during the assembly of the sample and the inspection and feedback of the fitting effect of each measuring point; fifth, the braking force input device can realize the real-time control and signal output function of the displacement of the output force application point and the output force size; sixth, the strain signal collection and processing device can realize the real-time correspondence between the braking force input and the strain signals collected at each measuring point; seventh, the brake assembly transmission device has the function of judging whether the sample to be tested meets the conditions for off-line bridge installation according to the stiffness test results, and can realize automatic return to the repair area or automatic transmission to the bridge installation area.

[0059] Correspondingly, such as Figure 4 As shown, the present invention also discloses a brake stiffness automatic detection method for a production assembly line, comprising the following steps:

[0060] S1: Assemble the brake assembly to be tested and the brake drum to be tested into the brake to be tested.

[0061] First, the brake assembly to be tested and the brake drum to be tested are transmitted to the assembly area on the testing line through the brake assembly fixture and the brake drum fixture respectively. Then, the production line automation controller performs positioning control through the position signals collected by the position sensors arranged on the brake assembly fixture and the brake drum fixture, and starts the brake precision installation device to assemble the brake assembly to be tested and the brake drum to be tested into the brake to be tested according to the requirements of the drawing.

[0062] S2: The strain sensing and collecting device is attached to the preset strain collecting point of the brake to be tested through the production line automation controller.

[0063] As an example, the strain sensing and collection device is precisely positioned: according to the pre-set position of the strain collection point on the brake to be tested, a programmed command is input into the production line automation controller, so that the strain sensing and collection device is automatically and accurately positioned at the strain collection point and achieves a tight fit.

[0064] S3: Input the programmed command into the production line automation controller, and connect the braking force input device with the brake to be detected through the production line automation controller.

[0065] Specifically, a programmed command is input into the production line automation controller so that the braking force input device is automatically connected to the brake to be detected.

[0066] S4: Perform a preliminary inspection on the installation fit between the strain sensing and acquisition device and the brake to be inspected, and generate a preliminary inspection result and send it to the production line automation controller.

[0067] Specifically: preloading is performed by controlling the braking force input device, and based on the strain signals collected by the strain signal collection and processing device, it is determined whether the strain sensing and collection device is installed in place and whether the operation of each strain measurement point channel is normal. Based on the judgment results, a pre-inspection result is generated and sent to the production line automation controller.

[0068] S5: The production line automation controller determines the pre-inspection result and adjusts the corresponding strain sensing and collection device according to the determination result.

[0069] Specifically, the production line automation controller determines the pre-inspection result according to the control algorithm set in advance; if the pre-inspection result meets the requirements, the stiffness detection test is started; if the pre-inspection result does not meet the requirements, a control signal is transmitted through the production line automation controller to start the backup strain acquisition sensing device to replace the current strain sensing acquisition device, and repeat step S4 until the pre-inspection work meets the requirements.

[0070] S6: According to the air chamber specifications matched with the brake to be tested, the air chamber push rod force curve corresponding to the air chamber at 0.8 MPa is input into the braking force input device for loading.

[0071] S7: The strain sensing acquisition device inputs the acquired strain time domain acquisition signal into the strain signal collection and processing device, and compares it with the preset stiffness thresholds of each measuring point that meet the requirements to generate a stiffness determination result.

[0072] S8: Input the stiffness determination result into the production line automation controller, and the production line controller processes the brake to be detected according to the stiffness determination result.

[0073] Specifically: when the stiffness determination result of the brake to be tested meets the requirements, the production line automation controller controls the strain sensing collection device to be separated from the brake to be tested, and controls the brake sample transmission device to transmit the brake to be tested with qualified stiffness to the bridge installation area for bridge installation. When the stiffness determination result of the brake to be tested does not meet the requirements, the production line automation controller controls the strain sensing collection device to be separated from the brake to be tested, and controls the brake sample transmission device to transmit the brake assembly to be tested with unqualified stiffness to the return line inspection area, and outputs the information of the parts with unqualified stiffness.

[0074] The present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope limited by the application.

Claims

1. An automatic brake stiffness detection system for a production assembly line, characterized in that: include: A brake assembly fixture, a brake drum fixture, a brake precision installation device, a strain sensing and collecting device, a braking force input device, a strain signal collecting and processing device, a brake sample transmission device and a production line automation controller; the production line automation controller is respectively connected to the brake assembly fixture, the brake drum fixture, the brake precision installation device, the strain sensing and collecting device, the braking force input device, the strain signal collecting and processing device and the brake sample transmission device by signals; A brake assembly fixture, used to transfer the brake assembly to be inspected to an assembly area on the inspection line; A brake drum fixture, used to transfer the brake drum to be inspected to the assembly area on the inspection line; A brake precision installation device, used to assemble the brake assembly to be tested and the brake drum to be tested into the brake to be tested in the assembly area according to the programmed command of the production line automation controller; The strain sensing and collecting device is used to fit on the preset strain collecting point of the brake to be tested, collect the strain signal of the corresponding measuring point, and send it to the strain signal collecting and processing device; A brake force input device, used to connect with the brake to be tested according to the programmed command of the production line automation controller and load the air chamber push rod force to the brake to be tested; The strain signal collection and processing device is used to compare the strain signal with the stiffness threshold at the preset strain collection point and input the determination result into the production line automation controller; The production line automation controller is used to control the strain sensing and collecting device to detach from the brake to be tested when the judgment result is that the stiffness of the brake to be tested does not meet the requirements, and control the brake sample transmission device to transmit the brake assembly to be tested to the return line inspection area, and at the same time output the information of the parts with unqualified stiffness.

2. The automatic brake stiffness detection system for a production assembly line according to claim 1 is characterized in that: The brake assembly fixing device and the brake drum fixing device are both provided with a plurality of position sensors, which are connected to the production line automation controller by signal. The assembly relationship between the brake assembly to be tested and the brake drum to be tested is preset through programmed commands, and the production line automation controller transmits the corresponding adjustment command to the brake precision installation device to control the assembly position between the brake assembly fixing device and the brake drum fixing device.

3. The automatic brake stiffness detection system for a production assembly line according to claim 2 is characterized in that: The strain sensing and collecting device adopts a contact measurement method to collect the strain time domain response signal of the preset strain collection point and send it to the strain signal collection and processing device; The production line automation controller is used to preset the position of the strain collection point through programmed commands according to the model and specifications of the brake to be tested, and accurately position the strain sensing and collection device according to the preset strain collection point.

4. The automatic brake stiffness detection system for a production assembly line according to claim 3 is characterized in that: The braking force input device is specifically used for: An electric cylinder is used as the output device of the loading force, and the displacement of the output force application point and the magnitude of the output force are used to generate a real-time signal of the loading force and transmitted to the strain signal collection and processing device.

5. The automatic brake stiffness detection system for a production assembly line according to claim 4 is characterized in that: The strain signal collection and processing device is specifically used for: Receive the strain time domain response signal and the real-time signal of the loading force, and process the collected received signals by setting the corresponding algorithm. The processed signal is consistent with the signal type of the preset signal threshold, and the processed signal is easily compared with the signal threshold, and the judgment result of whether the stiffness meets the requirements is transmitted to the production line automation controller.

6. A method for automatically detecting brake stiffness for a production assembly line, characterized in that: The steps include: S1: Assembling the brake assembly to be tested and the brake drum to be tested into a brake to be tested; S2: attaching the strain sensing and collecting device to the preset strain collecting point of the brake to be tested through the production line automation controller; S3: inputting the programmed command into the production line automation controller, and connecting the braking force input device to the brake to be tested through the production line automation controller; S4: Preliminary inspection of the installation fit between the strain sensing and acquisition device and the brake to be inspected, and generating a preliminary inspection result to be sent to the production line automation controller; S5: The production line automation controller determines the pre-inspection result and adjusts the corresponding strain sensing and collection device according to the determination result; S6: According to the air chamber specifications matched with the brake to be tested, the air chamber push rod force curve corresponding to the air chamber at 0.8 MPa is input into the braking force input device for loading; S7: The strain sensing and collecting device inputs the collected strain time domain collection signal into the strain signal collecting and processing device, and compares it with the preset stiffness threshold value of each measuring point that meets the requirements, and generates a stiffness determination result; S8: Input the stiffness determination result into the production line automation controller, and the production line controller processes the brake to be inspected according to the stiffness determination result.

7. The automatic detection method of brake stiffness for production assembly line according to claim 6, characterized in that: The step S1 comprises: The brake assembly to be inspected and the brake drum to be inspected are respectively transferred to the assembly area on the inspection line through the brake assembly fixing device and the brake drum fixing device; The production line automation controller performs positioning control through the position signals collected by the position sensors installed on the brake assembly fixture and the brake drum fixture, and starts the brake precision installation device to assemble the brake assembly to be tested and the brake drum to be tested into the brake to be tested according to the requirements of the drawings.

8. The automatic detection method of brake stiffness for production assembly line according to claim 6, characterized in that: The step S4 comprises: Preloading is performed by controlling the braking force input device. According to the strain signal collected by the strain signal collection and processing device, it is judged whether the strain sensing and collection device is installed in place and whether the operation of each strain measurement point channel is normal. According to the judgment result, a pre-inspection result is generated and sent to the production line automation controller.

9. The automatic detection method of brake stiffness for production assembly line according to claim 6, characterized in that: The step S5 comprises: The production line automation controller determines the pre-inspection result according to the control algorithm set in advance; if the pre-inspection result meets the requirements, the stiffness detection test is started; if the pre-inspection result does not meet the requirements, a control signal is transmitted through the production line automation controller to start the backup strain sensing and acquisition device to replace the current strain sensing and acquisition device, and step S4 is repeated until the pre-inspection work meets the requirements.

10. The automatic detection method of brake stiffness for production assembly line according to claim 6, characterized in that: The step S8 comprises: When the stiffness determination result of the brake to be tested meets the requirements, the production line automation controller controls the strain sensing and collecting device to be separated from the brake to be tested, and controls the brake sample transmission device to transmit the brake to be tested with qualified stiffness to the bridge installation area for bridge installation; When the stiffness determination result of the brake to be tested does not meet the requirements, the production line automation controller controls the strain sensing and acquisition device to separate from the brake to be tested, and controls the brake sample transmission device to transmit the brake assembly to be tested with unqualified stiffness to the return line inspection area, and outputs the information of the components with unqualified stiffness.

Images