A method and system for testing a pre-load force of a shock absorber

Abstract

The embodiment of the present application provides a method and system for testing the pre-load force of a shock absorber, aiming at effectively improving the rationality of the manufacturing process of the shock absorber and the reliability of the quality of the shock absorber. The method comprises the following steps: measuring a cutting force suffered by the shock absorber when a position below a guide of the shock absorber is cut by an external device; measuring a second sealing force suffered by the shock absorber when a first sealing force is applied to an outer cylinder of the shock absorber; obtaining a pre-load force of the shock absorber according to the cutting force, the first sealing force and the second sealing force; and determining whether the first sealing force meets the sealing requirement of the shock absorber based on the pre-load force.

Description

Technical Field

[0001] This solution relates to the field of vibration damper technology, and in particular to a method and system for testing the preload capacity of vibration dampers. Background Technology

[0002] Shock absorbers make vehicles more stable during driving, improve passenger comfort, and reduce vibrations; their performance is crucial. Current shock absorber manufacturing processes require sealing the outer cylinder of the shock absorber with an oil seal ring. The sealing force is a key parameter for evaluating the quality of this seal and a crucial factor determining the overall performance of the shock absorber. Insufficient sealing force can lead to a poor seal between the oil seal ring and the outer cylinder, causing oil leakage and affecting performance. Excessive sealing force can damage the outer cylinder or valve plates, rendering the shock absorber ineffective at cushioning road impacts during vehicle operation. Current manufacturing processes, considering ease of manufacturing and cost-effectiveness, only monitor the dimensional deviation from the shock absorber's nozzle to the oil seal ring, neglecting to monitor the sealing force applied during the sealing process. Therefore, determining the appropriate sealing force for different types of vibration dampers is a key issue in ensuring the rationality of the vibration damper manufacturing process and the reliability of the vibration damper quality. Summary of the Invention

[0003] In view of the above problems, this application provides a method and system for testing the preload force of a vibration damper, aiming to provide a test method for evaluating whether the sealing force of the vibration damper meets the sealing requirements of the vibration damper by means of the preload force of the vibration damper.

[0004] A first aspect of this application provides a method for testing the preload force of a vibration damper, the method comprising:

[0005] When the damper is cut by an external device at a position below the guide of the damper, the cutting force on the damper is measured.

[0006] When the outer cylinder of the shock absorber is subjected to a first sealing force, the second sealing force on the shock absorber is measured.

[0007] The preload force of the vibration damper is obtained based on the cutting force, the first sealing force, and the second sealing force.

[0008] Based on the preload force, determine whether the first sealing force meets the sealing requirements of the vibration damper.

[0009] Optionally, determining whether the first sealing force meets the sealing requirements of the vibration damper based on the preload force includes:

[0010] When the preload force is greater than or equal to a preset threshold, it is determined that the first sealing force meets the sealing requirements of the vibration damper;

[0011] When the preload force is less than the preset threshold, it is determined that the first sealing force does not meet the sealing requirements of the vibration damper.

[0012] Optionally, measuring the cutting force experienced by the vibration damper includes:

[0013] The cutting force experienced by the damper is measured using a Wheatstone full-bridge measurement circuit.

[0014] The measurement of the second sealing force on the vibration damper includes:

[0015] The second sealing force on the damper is measured using the Wheatstone full-bridge measurement circuit.

[0016] Optionally, the Wheatstone full-bridge measurement circuit includes: a tension / compression sensor consisting of a set of transverse sensitive grids and a set of longitudinal sensitive grids connected by wires, wherein the strain gauges are XY-shaped, the transverse sensitive grids are attached parallel to the central axis of the outer cylinder of the damper, and the longitudinal sensitive grids are attached perpendicularly to the central axis of the outer cylinder of the damper, and the two strain gauges are centrally symmetrically distributed with respect to the central axis of the outer cylinder of the damper.

[0017] Optionally, the method further includes:

[0018] The Wheatstone full-bridge measurement circuit detects the pressure values ​​experienced by the vibration damper under multiple pressure values ​​when multiple pressure values ​​are applied to it.

[0019] Determine the relationship between the plurality of pressure values ​​and their respective corresponding pressure values;

[0020] When the multiple pressure values ​​are positively correlated with their respective corresponding pressure values, it is determined that the Wheatstone full-bridge measurement circuit is connected normally.

[0021] The measurement of the cutting force experienced by the vibration damper includes:

[0022] With the Wheatstone full-bridge measurement circuit connected normally, the cutting force experienced by the damper is measured;

[0023] The measurement of the second sealing force on the vibration damper includes:

[0024] With the Wheatstone full-bridge measurement circuit connected normally, the second sealing force on the damper is measured.

[0025] Optionally, after measuring the cutting force experienced by the damper, assuming the Wheatstone full-bridge measurement circuit is properly connected, the method further includes:

[0026] Under the condition that the Wheatstone full-bridge measurement circuit is connected normally, determine whether the ratio between multiple preset pressure values ​​and their respective corresponding preset pressure values ​​is the same;

[0027] With the Wheatstone full-bridge measurement circuit connected normally, the second sealing force on the damper is measured, including:

[0028] When the Wheatstone full-bridge measuring circuit is connected normally, and when the ratio between the plurality of preset pressure values ​​and their respective corresponding preset pressure values ​​is the same, the second sealing force on the vibration damper is measured by the Wheatstone full-bridge measuring circuit.

[0029] Optionally, measuring the second sealing force on the shock absorber when the outer cylinder of the shock absorber is subjected to a first sealing force includes:

[0030] The sealing force applied to the outer cylinder of the shock absorber is uniformly accelerated from zero to the first sealing force;

[0031] When the force applied to the outer cylinder of the shock absorber reaches the first sealing force, the second sealing force on the shock absorber is measured.

[0032] A second aspect of this application provides a system for testing the preload force of a vibration damper, the system comprising: a tensile testing machine, a Wheatstone full-bridge measuring circuit, a data acquisition instrument, and a terminal;

[0033] The tensile testing machine is used to apply a sealing force to the outer cylinder of the vibration damper.

[0034] The Wheatstone full-bridge measurement circuit is used to measure the cutting force on the damper when it is cut by an external device at a position below the guide of the damper, and to measure the second sealing force on the damper when a first sealing force is applied to the outer cylinder of the damper.

[0035] The data acquisition device is used to send the cutting force, the first sealing force, and the second sealing force measured by the Wheatstone full-bridge measurement circuit to the terminal.

[0036] The terminal is used to determine, based on the preload force, whether the first sealing force meets the sealing requirements of the vibration damper.

[0037] The method for testing the preload of a vibration damper provided in this application involves cutting the area below the guide of the vibration damper using an external device. During the cutting process, the cutting force on the vibration damper is measured. After cutting the vibration damper, a first sealing force is applied to the outer cylinder of the vibration damper, and a second sealing force on the vibration damper is measured. The preload is obtained by multiplying the cutting force and the first sealing force by the second sealing force. Based on the magnitude of the preload, it can be determined whether sealing the outer cylinder of the vibration damper and the oil seal ring with the first sealing force meets the sealing requirements. When the obtained preload force is lower than a certain set value, sealing the outer cylinder of the vibration damper and the oil seal ring with the first sealing force corresponding to that preload force may result in oil leakage. This leads to the preload force being lower than the set value, and the first sealing force at this time does not meet the sealing requirements. When the obtained preload force is higher than or equal to a certain set value, sealing the outer cylinder of the vibration damper and the oil seal ring with the first sealing force corresponding to that preload force will not result in oil leakage, and the sealing requirements will be met. The test method provided in this application for evaluating whether the sealing force of the vibration damper meets the sealing requirements by using the vibration damper preload force avoids the problem of only monitoring the dimensional deviation from the pipe opening to the oil seal ring of the vibration damper. By monitoring the sealing force applied when the outer cylinder of the vibration damper and the oil seal ring are sealed, problems in the rationality of the vibration damper manufacturing process and the reliability of the vibration damper quality can be discovered, thereby effectively improving the rationality of the vibration damper manufacturing process and the reliability of the vibration damper quality. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a flowchart of a method for testing the preload force of a shock absorber according to an embodiment of this application;

[0040] Figure 2 This is a layout diagram of a Wheatstone full-bridge measurement circuit according to an embodiment of this application;

[0041] Figure 3 This is a circuit schematic diagram of a Wheatstone full-bridge measurement circuit proposed in one embodiment of this application;

[0042] Figure 4 This is a schematic diagram of a system for testing the preload of a vibration damper according to an embodiment of this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1-Tensile testing machine; 2-Wheatstone full-bridge measurement circuit; 3-Data acquisition instrument; 4-Terminal. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0046] Figure 1 This is a flowchart illustrating a method for testing the preload force of a vibration damper according to an embodiment of this application. (Refer to...) Figure 1 The method for testing the preload capacity of a shock absorber provided in this application includes the following steps:

[0047] Step S101: When the damper is cut by an external device at a position below the guide of the damper, measure the cutting force on the damper.

[0048] In this embodiment, step S101 involves cutting only the outer cylinder portion of the vibration damper. Therefore, the lower part of the guide of the vibration damper is cut using an external device. The vibration damper is vertically fixed to the clamping device. The lower part of the vibration damper is cut using the external device, and the cutting force experienced by the vibration damper during the cutting process is measured. The cutting force experienced by the vibration damper changes continuously during the cutting process, and the measured cutting force is the maximum cutting force experienced by the vibration damper during the cutting process. During the cutting process, the external device cuts clockwise along the outer cylinder of the vibration damper, ensuring a smooth cutting process and avoiding the generation of large instantaneous stress.

[0049] Preferably, the external device for cutting the vibration damper is provided by pipe wrenches. Other feasible devices can be substituted for the external device and clamping device used in this application, and no specific limitations are made here.

[0050] Step S102: When the outer cylinder of the shock absorber is subjected to a first sealing force, measure the second sealing force on the shock absorber.

[0051] In this embodiment, in step S101, the position below the shock absorber guide is cut, and the cutting force on the shock absorber is measured. Then, a first sealing force is applied to the outer cylinder of the cut shock absorber, and a second sealing force on the outer cylinder of the shock absorber is measured.

[0052] Preferably, a first sealing force is applied to the outer cylinder of the cut vibration damper using a ZWICK tensile testing machine. The device for applying the first sealing force to the outer cylinder of the cut vibration damper in this application can be replaced by other feasible devices, and is not limited to applying the first sealing force to the outer cylinder of the cut vibration damper using a ZWICK tensile testing machine; no specific limitation is made here.

[0053] Step S103: Obtain the preload force of the vibration damper based on the cutting force, the first sealing force, and the second sealing force.

[0054] In this embodiment, step S103 involves calculating the preload of the vibration damper based on the measured cutting force, second sealing force, and applied first sealing force. The preload of the vibration damper refers to the hydraulic stress borne by the inner cylinder of the damper during axial tension. Since the hydraulic stress borne inside the inner cylinder of the damper cannot be directly measured, the hydraulic stress borne by the inner cylinder, i.e., the preload of the vibration damper, is indirectly obtained by calculating the measured cutting force, second sealing force, and applied first sealing force.

[0055] Specifically, the maximum cutting force of the shock absorber obtained by measurement is X, the first sealing force applied to the outer cylinder of the shock absorber is Z, the second sealing force obtained by measurement is Y, and the preload force of the shock absorber obtained therefrom is X*(Z / Y).

[0056] Step S104: Based on the preload force, determine whether the first sealing force meets the sealing requirements of the vibration damper.

[0057] In this embodiment, after obtaining the preload force in step S104, it can be determined whether the sealing requirements of the outer cylinder of the vibration damper and the oil seal ring are met by the first sealing force corresponding to the preload force, based on the magnitude of the preload force.

[0058] The method for testing the preload of a vibration damper provided in this application involves measuring the cutting force and the second sealing force acting on the damper. The preload is obtained by solving for the cutting force, the first sealing force, and the second sealing force. Based on the magnitude of this preload, it can be determined whether sealing the outer cylinder of the vibration damper with the oil seal using the first sealing force meets the sealing requirements. When the obtained preload is lower than a certain set value, sealing the outer cylinder of the vibration damper with the oil seal using the corresponding first sealing force may result in oil leakage. Therefore, when the preload is lower than the set value, sealing the outer cylinder of the vibration damper with the oil seal using the first sealing force does not meet the sealing requirements. When the obtained preload is higher than or equal to the set value, sealing the outer cylinder of the vibration damper with the oil seal using the corresponding first sealing force will not result in oil leakage, and thus meets the sealing requirements. Therefore, this application provides a test method for evaluating whether the sealing force of a vibration damper meets the sealing requirements of the vibration damper by using the preload force of the vibration damper. This avoids the problem of only monitoring the dimensional deviation from the pipe opening to the oil seal ring of the vibration damper. By monitoring the sealing force applied when sealing the outer cylinder of the vibration damper to the oil seal ring, the problem of insufficient rationality in the manufacturing process of the vibration damper and low reliability of the vibration damper quality can be avoided, effectively improving the rationality of the manufacturing process of the vibration damper and the reliability of the vibration damper quality.

[0059] In this application, step S104, determining whether the first sealing force corresponding to the preload force meets the sealing requirements of the vibration damper based on the preload force, specifically includes: when the preload force is greater than or equal to a preset threshold, determining that the first sealing force meets the sealing requirements of the vibration damper; when the preload force is less than the preset threshold, determining that the first sealing force does not meet the sealing requirements of the vibration damper.

[0060] In this embodiment, the minimum preload force required to meet the sealing requirements of the shock absorber is preset as a preset threshold. After obtaining the preload force of the shock absorber through the above steps S101 to S103, when the preload force is greater than or equal to the preset threshold, the first sealing force corresponding to the preload force seals the outer cylinder of the shock absorber and the oil seal ring to meet the sealing requirements. When the preload force is less than the preset threshold, the first sealing force corresponding to the preload force seals the outer cylinder of the shock absorber and the oil seal ring to fail to meet the sealing requirements. This can be understood as the first sealing force corresponding to the preload force sealing the outer cylinder of the shock absorber and the oil seal ring failing to meet the sealing requirements, resulting in oil leakage inside the shock absorber. Consequently, the hydraulic stress inside the shock absorber cannot reach the preset threshold, meaning the preload force obtained through the solution does not reach the preset threshold.

[0061] Preferably, the minimum preload force required to meet the sealing requirements of different types of vibration dampers is different. Therefore, the preset threshold of the preload force required to meet the sealing requirements of different types of vibration dampers is determined according to the actual situation, without making specific limitations here.

[0062] In this application, step S101, measuring the cutting force on the vibration damper, includes: measuring the cutting force on the vibration damper using a Wheatstone full-bridge measurement circuit; step S102, measuring the second sealing force on the vibration damper, includes: measuring the second sealing force on the vibration damper using the Wheatstone full-bridge measurement circuit.

[0063] In this embodiment, the cutting force on the damper and the second sealing force on the damper are measured by a Wheatstone full-bridge measurement circuit.

[0064] In this application, the Wheatstone full-bridge measurement circuit includes a tension / compression sensor consisting of a set of transverse sensitive grids and a set of longitudinal sensitive grids connected by wires. The strain gauges are XY-shaped, the transverse sensitive grids are attached parallel to the central axis of the outer cylinder of the damper, and the longitudinal sensitive grids are attached perpendicular to the central axis of the outer cylinder of the damper. The two strain gauges are centrally symmetrically distributed with respect to the central axis of the outer cylinder of the damper.

[0065] In this embodiment, Figure 2 This is a layout diagram of a Wheatstone full-bridge measurement circuit according to an embodiment of this application; Figure 3 This is a circuit schematic diagram of a Wheatstone full-bridge measurement circuit according to an embodiment of this application. (Refer to...) Figure 2 R1, R2, R3, and R4 represent the resistance values ​​corresponding to the sensing grids of the two strain gauges. R1 and R3 represent the resistance values ​​corresponding to the transverse sensing grids, and R2 and R4 represent the resistance values ​​corresponding to the longitudinal sensing grids. The transverse sensing grids are attached parallel to the central axis of the outer cylinder of the vibration damper, and the longitudinal sensing grids are attached perpendicular to the central axis of the outer cylinder. The two strain gauges are centrally symmetrically distributed with respect to the central axis of the outer cylinder. (Refer to...) Figure 3 Two strain gauges are connected end-to-end by wires, with four wires leading out from the connection terminals. S+ and S- serve as the positive and negative terminals for power supply, and P+ and P- serve as the positive and negative terminals for signal. The Wheatstone full-bridge measurement circuit is connected to a data acquisition instrument, which transmits the cutting force and the second sealing force on the vibration damper measured by the Wheatstone full-bridge measurement circuit to the terminal. Thus, the Wheatstone full-bridge measurement circuit constitutes a tension and compression sensor for measuring various forces acting on the vibration damper.

[0066] Specifically, each strain gauge consists of a transverse sensitive grid and a longitudinal sensitive grid. For example, R1 and R4 constitute one strain gauge, and R2 and R3 constitute another strain gauge. R1, R2, R3, and R4 are connected by wires to form two strain gauges.

[0067] Preferably, the resistance values ​​of the two strain gauge tension / compression sensors are 120Ω each. However, other resistance values ​​can be selected depending on the actual application, and are not limited here.

[0068] Specifically, when attaching the Wheatstone full-bridge measurement circuit to the center of the shock absorber's outer cylinder, the rough surface of the outer cylinder hinders proper attachment. Therefore, before attaching the Wheatstone full-bridge measurement circuit, the surface of the shock absorber's outer cylinder must be pre-treated. The center of the outer cylinder is sanded with sandpaper in two perpendicular directions until no scratches remain. Degreasing solution is then applied to the sanded surface of the outer cylinder until no dirt remains on the degreasing cotton. The shock absorber is then left to dry. Finally, a neutralizing agent is sprayed onto the surface of the outer cylinder to neutralize the grease, and the surface is left to dry completely.

[0069] In this application, the method further includes: obtaining, under the condition that multiple pressure values ​​are applied to the vibration damper, detecting the pressure values ​​experienced by the vibration damper under the multiple pressure values ​​through the Wheatstone full-bridge measurement circuit; determining the relationship between the multiple pressure values ​​and their respective corresponding pressure values; determining that the Wheatstone full-bridge measurement circuit is connected normally when the multiple pressure values ​​and their respective corresponding pressure values ​​are positively correlated; the measurement of the cutting force experienced by the vibration damper includes: measuring the cutting force experienced by the vibration damper when the Wheatstone full-bridge measurement circuit is connected normally; the measurement of the second sealing force experienced by the vibration damper includes: measuring the second sealing force experienced by the vibration damper when the Wheatstone full-bridge measurement circuit is connected normally.

[0070] In this embodiment, when using the Wheatstone full-bridge measurement circuit to measure the cutting force and second sealing force on the vibration damper, a measurement error may occur due to the Wheatstone full-bridge measurement circuit not being properly connected. Therefore, before using the Wheatstone full-bridge measurement circuit to measure the cutting force on the vibration damper in step S101, it can be determined whether the Wheatstone full-bridge measurement circuit is properly connected. After confirming that the Wheatstone full-bridge measurement circuit is properly connected, the cutting force and second sealing force on the vibration damper are measured using the Wheatstone full-bridge measurement circuit.

[0071] Specifically, multiple pressure values ​​are applied to the vibration damper, and the compression value experienced by the damper under each pressure value is measured using a Wheatstone full-bridge measurement circuit. If each pressure value and its corresponding compression value are positively correlated, the Wheatstone full-bridge measurement circuit is considered to be connected correctly. If there is no positive correlation between the pressure value and its corresponding compression value, the Wheatstone full-bridge measurement circuit is considered to be connected incorrectly. After correcting the connection, the circuit is checked again until each pressure value and its corresponding compression value are positively correlated, at which point the circuit is considered to be connected correctly. A positive correlation means that as the pressure value applied to the vibration damper increases, the corresponding compression value also increases; in this case, the pressure value and its corresponding compression value are considered to be positively correlated.

[0072] In this application, after measuring the cutting force on the vibration damper when the Wheatstone full-bridge measuring circuit is connected normally, the method further includes: determining whether the ratio between a plurality of preset pressure values ​​and their respective corresponding preset pressure values ​​is the same when the Wheatstone full-bridge measuring circuit is connected normally; and measuring the second sealing force on the vibration damper when the Wheatstone full-bridge measuring circuit is connected normally, including: measuring the second sealing force on the vibration damper through the Wheatstone full-bridge measuring circuit when the ratio between the plurality of preset pressure values ​​and their respective corresponding preset pressure values ​​is the same when the Wheatstone full-bridge measuring circuit is connected normally.

[0073] In this embodiment, even if the Wheatstone full-bridge measurement circuit is confirmed to be connected correctly, it may still have the problem of inaccurate measurement of the sealing force. Only when the multiple first sealing forces applied to the vibration damper and the corresponding second sealing forces measured by the Wheatstone full-bridge measurement circuit change linearly—that is, when the ratio between each first sealing force and its corresponding second sealing force is the same—can it be determined that the Wheatstone full-bridge measurement circuit can perform accurate measurements.

[0074] Therefore, if it is confirmed that the Wheatstone full-bridge measurement circuit is connected normally, that is, if it is confirmed that multiple pressure values ​​are positively correlated with their corresponding pressure values, it can also be determined whether the Wheatstone full-bridge measurement circuit can perform accurate measurements.

[0075] Specifically, with the Wheatstone full-bridge measurement circuit connected correctly, after measuring the cutting force on the vibration damper, multiple preset pressure values ​​are applied to the vibration damper. The Wheatstone full-bridge measurement circuit then measures the preset compression value experienced by the vibration damper under each of these preset pressure values. When each preset pressure value and its corresponding preset compression value show a linear relationship, that is, when the ratio between each preset pressure value and its corresponding preset compression value is the same, it is determined that the Wheatstone full-bridge measurement circuit can perform accurate measurements. Once it is determined that the Wheatstone full-bridge measurement circuit can perform accurate measurements, the second sealing force experienced by the vibration damper is measured using the Wheatstone full-bridge measurement circuit.

[0076] In this application, step S102, when the outer cylinder of the shock absorber is subjected to a first sealing force, measures the second sealing force on the shock absorber, specifically including: the sealing force applied to the outer cylinder of the shock absorber is uniformly accelerated from zero to the first sealing force; when the force applied to the outer cylinder of the shock absorber reaches the first sealing force, the second sealing force on the shock absorber is measured.

[0077] In this embodiment, the sealing force applied to the outer cylinder of the shock absorber is uniformly accelerated from 0 N to the first sealing force. A preset maximum force value is set for the outer cylinder, and loading is performed in steps at a preset loading speed. The loading process is divided into several loading points, with the force difference between every two sealing force loading points being a preset interval force value. The loading process lasts for a preset time, with a preset pause in between, repeating until the first preload force is reached. When the first preload force is reached, the value measured by the Wheatstone full-bridge measurement circuit is the second sealing force, wherein the first sealing force applied to the outer cylinder of the shock absorber is less than or equal to the preset force value.

[0078] Preferably, the preset loading speed is 200 mm / min, the preset force is 20 kN, the preset interval force is 2 kN, and the preset time is 3 seconds. The above-mentioned preferred values ​​of preset loading speed, preset force, and preset time are only preferred embodiments and can be set according to actual conditions. No specific limitation is made here.

[0079] The method for testing the preload of the vibration damper provided in this application avoids the problem of only monitoring the dimensional deviation from the pipe opening to the oil seal ring of the vibration damper. It can further monitor the sealing force applied when sealing the outer cylinder of the vibration damper and the oil seal ring, thereby solving the problems of insufficient rationality in the manufacturing process of the vibration damper and reduced reliability of the vibration damper quality, and effectively improving the rationality of the manufacturing process of the vibration damper and the reliability of the vibration damper quality.

[0080] Based on the same inventive concept, this application also provides a system for testing the preload force of a shock absorber. Figure 4 This is a schematic diagram of a system for testing the preload force of a vibration damper according to an embodiment of this application. (Refer to...)Figure 4 The system for testing the preload of a vibration damper provided in this application includes: a tensile testing machine 1, a Wheatstone full-bridge measuring circuit 2, a data acquisition instrument 3, and a terminal 4;

[0081] The tensile testing machine is used to apply a sealing force to the outer cylinder of the vibration damper.

[0082] The Wheatstone full-bridge measurement circuit is used to measure the cutting force on the damper when it is cut by an external device at a position below the guide of the damper, and to measure the second sealing force on the damper when a first sealing force is applied to the outer cylinder of the damper.

[0083] The data acquisition device is used to send the cutting force, the first sealing force, and the second sealing force measured by the Wheatstone full-bridge measurement circuit to the terminal.

[0084] The terminal is used to determine, based on the preload force, whether the first sealing force meets the sealing requirements of the vibration damper.

[0085] As the system implementation is basically similar to the method implementation, it is described in a relatively simple way. For relevant details, please refer to the description of the method implementation.

[0086] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0087] Those skilled in the art will understand that embodiments of this application can be provided as methods, apparatus, or computer program products. Therefore, embodiments of this application can take the form of entirely hardware embodiments, entirely software embodiments, or embodiments combining software and hardware aspects. Furthermore, embodiments of this application can take the form of computer program products implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0088] This application describes embodiments with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations. Figure 1One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0089] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing terminal device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0090] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal equipment, causing a series of operational steps to be performed on the computer or other programmable terminal equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable terminal equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0091] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0092] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0093] The above provides a detailed description of the method and system for testing the preload force of a shock absorber provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and its core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for testing the preload capacity of a vibration damper, characterized in that, The method includes: When the damper is cut by an external device at a position below the guide of the damper, the cutting force on the damper is measured. When the outer cylinder of the shock absorber is subjected to a first sealing force, the second sealing force on the shock absorber is measured. The preload force of the vibration damper is obtained based on the cutting force, the first sealing force, and the second sealing force. Based on the preload force, it is determined whether the first sealing force meets the sealing requirements of the vibration damper. The preload force is obtained based on the cutting force multiplied by the ratio of the first sealing force to the second sealing force. The cutting force experienced by the damper is measured using a Wheatstone full-bridge measurement circuit. The measurement of the second sealing force on the vibration damper includes: The second sealing force on the damper is measured using the Wheatstone full-bridge measurement circuit. The Wheatstone full-bridge measurement circuit includes a tension / compression sensor consisting of a set of transverse sensitive grids and a set of longitudinal sensitive grids connected by wires.

2. The method according to claim 1, characterized in that, The step of determining whether the first sealing force meets the sealing requirements of the vibration damper based on the preload force includes: When the preload force is greater than or equal to a preset threshold, it is determined that the first sealing force meets the sealing requirements of the vibration damper; When the preload force is less than the preset threshold, it is determined that the first sealing force does not meet the sealing requirements of the vibration damper.

3. The method according to claim 1, characterized in that, The strain gauge is XY shaped. The transverse sensitive grid is attached parallel to the central axis of the outer cylinder of the damper, and the longitudinal sensitive grid is attached perpendicular to the central axis of the outer cylinder of the damper. The two strain gauges are centrally symmetrically distributed with respect to the central axis of the outer cylinder of the damper.

4. The method according to claim 1, characterized in that, The method further includes: The Wheatstone full-bridge measurement circuit detects the pressure values ​​experienced by the vibration damper under multiple pressure values ​​when multiple pressure values ​​are applied to it. Determine the relationship between the plurality of pressure values ​​and their respective corresponding pressure values; When the multiple pressure values ​​are positively correlated with their respective corresponding pressure values, it is determined that the Wheatstone full-bridge measurement circuit is connected normally. The measurement of the cutting force experienced by the vibration damper includes: With the Wheatstone full-bridge measurement circuit connected normally, the cutting force experienced by the damper is measured; The measurement of the second sealing force on the vibration damper includes: With the Wheatstone full-bridge measurement circuit connected normally, the second sealing force on the damper is measured.

5. The method according to claim 4, characterized in that, With the Wheatstone full-bridge measurement circuit connected normally, after measuring the cutting force experienced by the damper, the method further includes: Under the condition that the Wheatstone full-bridge measurement circuit is connected normally, determine whether the ratio between multiple preset pressure values ​​and their respective corresponding preset pressure values ​​is the same; With the Wheatstone full-bridge measurement circuit connected normally, the second sealing force on the damper is measured, including: When the Wheatstone full-bridge measuring circuit is properly connected, and when the ratio between the plurality of preset pressure values ​​and their respective corresponding preset pressure values ​​is the same, the second sealing force on the damper is measured by the Wheatstone full-bridge measuring circuit.

6. The method according to claim 1, characterized in that, The measurement of the second sealing force on the vibration damper when the outer cylinder of the vibration damper is subjected to a first sealing force includes: The sealing force applied to the outer cylinder of the shock absorber is uniformly accelerated from zero to the first sealing force; When the force applied to the outer cylinder of the shock absorber reaches the first sealing force, the second sealing force on the shock absorber is measured.

7. A system for testing the preload capacity of a vibration damper, characterized in that, The system includes: a tensile testing machine, a Wheatstone full-bridge measurement circuit, a data acquisition instrument, and a terminal; The tensile testing machine is used to apply a sealing force to the outer cylinder of the vibration damper. The Wheatstone full-bridge measurement circuit is used to measure the cutting force on the vibration damper when it is cut by an external device below the guide of the vibration damper, and to measure the second sealing force on the vibration damper when a first sealing force is applied to the outer cylinder of the vibration damper. The measurement of the second sealing force on the vibration damper includes: measuring the second sealing force on the vibration damper through the Wheatstone full-bridge measurement circuit; the Wheatstone full-bridge measurement circuit includes: a tension / compression sensor composed of a set of transverse sensitive grids and a set of longitudinal sensitive grids connected by wires. The data acquisition device is used to send the cutting force, the first sealing force, and the second sealing force measured by the Wheatstone full-bridge measurement circuit to the terminal; The terminal is used to determine whether the first sealing force meets the sealing requirements of the vibration damper based on the preload force, wherein the preload force is obtained by multiplying the cutting force by the ratio of the first sealing force to the second sealing force.

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