A device and method for testing the insertion and extraction force of a car plastic part buckle

Abstract

The application discloses a kind of automobile plastic part buckle plug-in force testing device and analysis method, it is related to automobile accessory testing technical field, including fixed base, device support and tension-compression sensor, the present application is by being fixed in plug-in control mechanism to the buckle to be measured, obtains the center point of the buckle to be measured, according to the fixed center point of the counterpart piece adjustment counterpart piece clamp, obtains the size data of counterpart piece and the buckle to be measured, size data is imported into three-dimensional modeling software to establish entity unit model, and structural network is divided, simultaneously obtaining the tension data of tension-compression sensor in plug-in force testing process, according to tension data calculates the strain distribution of the buckle to be measured in plug-in test process, according to strain trend analysis buckle performance, and then optimize the material and structure of buckle and counterpart piece.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile accessory testing, in particular to a device and method for testing the insertion and extraction force of a buckle of an automobile plastic part. BACKGROUND

[0002] A large number of engineering plastic parts are used in automobile interiors, which are connected to counterpart parts through buckles. Therefore, the insertion and extraction force of the buckle during installation and removal has a significant impact on the structural life of the plastic part and the counterpart part. Designing appropriate buckle structures and selecting materials can ensure that the counterpart part is not damaged during installation and removal. Automobile plastic part buckle insertion and extraction force testing refers to testing the force required during the insertion and extraction of a plastic buckle to ensure that it can be reliably connected and removed in actual use. This test is very important for the design, material selection, and production quality control of plastic buckles. To effectively obtain the insertion and extraction force between plastic buckles of different structural forms and materials and counterpart parts, appropriate buckle structures and materials need to be designed to ensure that the counterpart part is not damaged during installation and removal. However, the existing insertion and extraction force testing structure can achieve stable positioning, but there is still deviation in center calibration, and the degree of intelligence is low, which cannot output targeted optimization data.

[0003] In view of the above technical defects, the present application provides a solution. SUMMARY

[0004] The purpose of the present application is to fix the buckle to be tested in the insertion and extraction control mechanism, obtain the center point of the buckle to be tested, adjust the counterpart part clamp according to the fixed center point of the counterpart part, obtain the size data of the counterpart part and the buckle to be tested, import the size data into a three-dimensional modeling software to establish a solid element model, and divide the structure network. At the same time, the tension data of the tension sensor during the insertion and extraction force test is obtained, the strain distribution of the buckle to be tested during the insertion and extraction test is calculated according to the tension data, the performance of the buckle is analyzed according to the strain trend, and the materials and structures of the buckle and the counterpart part are optimized.

[0005] To achieve the above purpose, the present application adopts the following technical scheme: a device for testing the insertion and extraction force of a buckle of an automobile plastic part, comprising a fixed base, a device support and a tension sensor, the device support is fixedly arranged on the top surface of the fixed base, the top surface of the device support is fixedly provided with an insertion and extraction control mechanism, the insertion and extraction control mechanism is used for fixing the buckle to be tested and controlling the insertion and extraction force, the top surface of the fixed base is fixedly provided with a counterpart part clamp, the counterpart part clamp is used for fixing the counterpart part matched with the buckle to be tested, and the tension sensor is fixedly arranged in the inside of the counterpart part clamp.

[0006] Further, the plug-in control mechanism comprises a servo motor and a buckle clamp, one side surface of the device support is fixedly provided with a vertical rail, a sliding table is movably arranged on the inner wall of the vertical rail, the servo motor is fixedly arranged on the outer side surface of the vertical rail, a ball screw is fixedly arranged on the output end outer side surface of the servo motor, the sliding table is movably arranged on the outer side surface of the ball screw, and the buckle clamp is fixedly arranged on the outer side surface of the sliding table.

[0007] Further, the buckle clamp comprises a clamping seat and a lateral clamping piece, the clamping seat is fixedly arranged on the outer side surface of the sliding table, a suction pump is fixedly arranged on the top end surface of the clamping seat, a vacuum chuck is fixedly arranged on the bottom end surface of the clamping seat, a suction pipe is arranged between the output end outer side surface of the suction pump and the vacuum chuck, and the lateral clamping piece is fixedly arranged on the outer side surface of the clamping seat.

[0008] Further, the lateral clamping piece comprises lateral support shafts, a plurality of radially distributed movement grooves are formed in the inner part of the clamping seat, a magnet shaft is movably arranged on the inner wall of each movement groove, a return spring is arranged between each magnet shaft and the corresponding movement groove, a plurality of electromagnets are fixedly arranged in the inner part of the clamping seat, each electromagnet corresponds to a magnet shaft, one end of each lateral support shaft is connected to the end surface of the magnet shaft, the other end of each lateral support shaft is connected with an elastic pressing block, and the lateral support shafts and the horizontal end surface form a fixed inclination angle.

[0009] Further, the opponent piece clamp comprises an electric push rod and a moving seat, a plurality of adjusting grooves are radially distributed on the top end surface of the fixed base, a plurality of electric push rods are fixedly arranged on the inner wall of the adjusting grooves, a plurality of moving seats are movably connected to the inner wall of the adjusting grooves, the output end of the electric push rod is connected to the outer side surface of the moving seat, a positioning groove is formed in one side surface of the moving seat, a threaded groove is formed in the top end surface of the moving seat, a fixing bolt is threadedly connected to the inner wall of the threaded groove, a positioning block is connected to the top end surface of the fixing bolt, and the tension and pressure sensor is fixedly arranged on the bottom end surface of the positioning block.

[0010] The application also provides an analysis method of the automobile plastic part buckle plug-in force testing device, which comprises the following operation steps:

[0011] Step one: fixing the to-be-tested buckle in the plug-in control mechanism, obtaining the center point of the to-be-tested buckle, projecting the center point on the surface of the fixed base to obtain the fixed center point of the opponent piece;

[0012] Step two: adjusting the opponent piece clamp according to the fixed center point of the opponent piece, fixing the opponent piece to obtain the pressure data of the tension and pressure sensor, and generating a clamping-in-place signal when the pressure data reaches a preset pressure threshold value;

[0013] Step three, after obtaining the clamping in place signal, zero the tension sensor, and control the servo motor to drive the clamping seat to move up and down for the insertion and extraction force test;

[0014] Step four, obtain the size data of the opponent and the to-be-tested buckle, use Ansys Workbench environment, establish a three-dimensional finite element model through the system control module, import the size data into the three-dimensional finite element model to establish a solid element model, and divide the structure network, while obtaining the tension data of the tension sensor in the insertion and extraction force test process, and analyze the strain test based on structural mechanics;

[0015] Step five, based on the tension data obtained in the test process, analyze the strain according to the tension data, and optimize the materials and structures of the buckle and the opponent according to the strain trend.

[0016] Further, the specific process of strain test based on structural mechanics analysis is as follows:

[0017] S101, obtain the horizontal size data of the fixed base and the horizontal height of the top surface of the fixed base, take the top surface of the fixed base as the origin, and establish a three-dimensional coordinate system with the vertical surface of the device support as the Z axis;

[0018] S102, obtain the size data of the opponent and the to-be-tested buckle, import the size data into the three-dimensional modeling software to establish a solid element model, and dynamically divide according to the stress and strain distribution in the structure of the solid element model, using fine mesh in the stress concentration area and regular mesh in other areas;

[0019] S103, obtain the mechanical properties of the materials used by the opponent and the to-be-tested buckle, including elastic modulus, Poisson's ratio, and density, and input into the solid element model to ensure the accuracy of the solid element model;

[0020] S104, according to the requirements of the simulation statics strain test, set the fixing, constraint and displacement limiting conditions of the plastic buckle insertion and extraction structure, and according to the simulation statics strain test requirements, control the output power of the servo motor, adjust the position of the slide on the vertical rail, adjust the position of the to-be-tested buckle, realize the insertion and extraction action test of the to-be-tested buckle and the opponent;

[0021] S105, obtain the tension data of the tension sensor 3 in the test process, and calculate the strain distribution of the to-be-tested buckle in the insertion and extraction test process according to the tension data.

[0022] Further, the specific process of result analysis according to the tension data is as follows:

[0023] The specific process of result analysis according to the tension data is as follows:

[0024] S201, obtain the tension data Fi obtained by the tension sensor 3 in the test process, and the elastic modulus of the buckle to be tested, and the deformation data AL of the buckle to be tested in the plug-in test process can be obtained according to the tension data Fi.

[0025] The strain value of each position in the buckle structure to be tested is calculated according to the following formula: Wherein, L0 is the original surface deformation data of the buckle to be tested.

[0026] S202, the strain value is input into the entity unit model, and the strain nephogram is obtained through simulation visualization processing, the stress concentration area is determined as the optimization area, the strain values of different values are divided into intervals according to the preset strain interval, the strain values in the same interval are visually represented by using the same color, and the strain nephogram with different color blocks is obtained.

[0027] S203, the strain nephogram is subjected to gray scale processing to obtain the gray scale values of different color blocks, the preset optimization threshold is obtained, the color blocks with gray scale values greater than or equal to the optimization threshold are divided into the optimization area, that is, the stress concentration area, which indicates that the stress performance of the optimization area is concentrated, and there is a risk of deformation exceeding the standard;

[0028] S204, deformation prediction analysis is carried out based on the preset deformation prediction model, the corresponding stress values in the optimization area are substituted into the deformation prediction model one by one, if the deformation prediction result output is that the deformation trend increases, the material and structure in the optimization area are determined as the optimization area, and the optimization direction of the optimization area is selected based on the existing material and standby material of the buckle to be tested.

[0029] As described above, by adopting the above technical scheme, the beneficial effects of the present application are:

[0030] The automobile plastic buckle plug-in force test device drives the lateral support shaft to approach the buckle to be tested through magnetic attraction, until the elastic pressing block clamps and fixes the outer surface of the buckle to be tested, at this time, the suction pump draws vacuum through the suction pipeline, and the buckle to be tested is further fixed through the adsorption of the vacuum chuck. The output length of each electric push rod is adjusted through the center point of the buckle to be tested, so that the center point of the hand piece and the center point of the buckle to be tested coincide with each other, and the hand piece is vertically fixed through the positioning block, so as to ensure the stability in the plug-in test process.

[0031] The analysis method of the automobile plastic part buckle insertion and extraction force testing device fixes the to-be-tested buckle in the insertion and extraction control mechanism, obtains the center point of the to-be-tested buckle, adjusts the counterpart part clamp according to the fixed center point of the counterpart part, obtains the size data of the counterpart part and the to-be-tested buckle, imports the size data into a three-dimensional modeling software to establish a solid element model and divide a structure network, simultaneously obtains the tension data of the tension sensor in the insertion and extraction force testing process, calculates the strain distribution of the to-be-tested buckle in the insertion and extraction testing process according to the tension data, analyzes the performance of the buckle according to the strain trend, and further optimizes the materials and structures of the buckle and the counterpart part. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The overall external structure schematic diagram of the present application is shown;

[0033] Figure 2 The internal structure schematic diagram of the clamping seat of the present application is shown;

[0034] Figure 3 The internal structure schematic diagram of the fixed base of the present application is shown;

[0035] Figure 4 The to-be-tested buckle assembly schematic diagram of the present application is shown;

[0036] Figure 5 The analysis method flow chart of the present application is shown;

[0037] Figure 6 The to-be-tested buckle testing process load schematic diagram of the present application is shown;

[0038] Figure 7 The stress distribution diagram of the to-be-tested buckle in the testing process of the present application is shown;

[0039] Figure 8 The counterpart part load schematic diagram in the testing process of the present application is shown;

[0040] Figure 9 The stress distribution diagram of the to-be-tested buckle under the maximum load in the testing process of the present application is shown;

[0041] Legend: 1, device support; 2, fixed base; 3, tension sensor; 4, clamping seat; 5, suction pump; 6, vacuum chuck; 7, suction pipeline; 8, moving groove; 9, magnet shaft; 10, return spring; 11, electromagnet; 12, lateral support shaft; 13, elastic pressing block; 14, adjusting groove; 15, electric push rod; 16, moving seat; 17, positioning groove; 18, threaded groove; 19, fixed bolt; 20, positioning block; 21, vertical rail; 22, sliding table; 23, servo motor; 24, ball screw. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] Example 1:

[0044] like Figures 1-4 As shown, a device for testing the plugging and unplugging force of automobile plastic parts buckles includes a fixed base 2, a device bracket 1 and a tension and compression sensor 3. The device bracket 1 is fixed to the top surface of the fixed base 2. The top surface of the device bracket 1 is fixed with a plugging and unplugging control mechanism. The plugging and unplugging control mechanism is used to fix the buckle to be tested and control the plugging and unplugging force. The top surface of the fixed base 2 is fixed with a pair of workpiece clamps. The pair of workpiece clamps are used to fix the pair of workpieces that are compatible with the buckle to be tested. The tension and compression sensor 3 is fixed inside the pair of workpiece clamps.

[0045] The plug-in and pull-out control mechanism includes a servo motor 23 and a snap-on clamp. A vertical track 21 is fixedly provided on one side surface of the device bracket 1, and a slide 22 is movably installed on the inner wall of the vertical track 21. The servo motor 23 is fixed on the outer surface of the vertical track 21, and a ball screw 24 is fixed on the outer surface of the output end of the servo motor 23. The slide 22 is movably sleeved on the outer surface of the ball screw 24, and the snap-on clamp is fixed on the outer surface of the slide 22.

[0046] The snap clamp includes a clamping seat 4 and a lateral clamping piece. The clamping seat 4 is fixed to the outer surface of the slide 22. A suction pump 5 is fixed to the top surface of the clamping seat 4. A vacuum suction cup 6 is fixed to the bottom surface of the clamping seat 4. A suction pipe 7 is installed between the outer surface of the output end of the suction pump 5 and the vacuum suction cup 6. The lateral clamping piece is fixed to the outer surface of the clamping seat 4.

[0047] The lateral clamping member includes a lateral support shaft 12, and a plurality of radially distributed movable grooves 8 are opened inside the clamping seat 4. A magnet shaft 9 is movably connected to the inner wall of each movable groove 8. A reset spring 10 is installed between each magnet shaft 9 and the corresponding movable groove 8. A plurality of electromagnets 11 are fixedly provided inside the clamping seat 4, and each electromagnet 11 corresponds to the magnet shaft 9 one by one. One end of the plurality of lateral support shafts 12 is respectively connected to the end surface of the magnet shaft 9, and the other end of the plurality of lateral support shafts 12 is connected to an elastic pressure block 13. The plurality of lateral support shafts 12 form a fixed inclination angle with the horizontal end surface.

[0048] The hand piece clamp includes an electric push rod 15 and a movable seat 16. A plurality of adjustment grooves 14 are radially distributed on the top surface of the fixed base 2. A plurality of electric push rods 15 are respectively fixed on the inner walls of the adjustment grooves 14. A plurality of movable seats 16 are respectively movably connected to the inner walls of the adjustment grooves 14. The output end of the electric push rod 15 is connected to the outer surface of the movable seat 16. A positioning groove 17 is provided on one side surface of the movable seat 16. A threaded groove 18 is provided on the top surface of the movable seat 16. A fixing bolt 19 is threadedly connected to the inner wall of the threaded groove 18. The top surface of the fixing bolt 19 is connected to a positioning block 20. The tension and compression sensor 3 is fixed on the bottom surface of the positioning block 20.

[0049] The working principle is as follows: before conducting the plug-in force test, the buckle to be tested is placed under the plug-in control mechanism so that the buckle to be tested is close to the bottom end of the vacuum suction cup 6. At this time, the control electromagnet 11 is connected to the circuit. Since the magnetic properties between the corresponding surfaces of the magnet shaft 9 and the electromagnet 11 are opposite, the magnet shaft 9 moves inward along the movable groove 8 under the action of magnetic attraction, thereby driving the lateral support shaft 12 to approach the buckle to be tested until the elastic pressure block 13 clamps and fixes the outer surface of the buckle to be tested. At this time, the suction pump 5 draws vacuum from the vacuum suction cup 6 through the suction pipe 7, and the buckle to be tested is further fixed by the adsorption of the vacuum suction cup 6;

[0050] Place the opponent in the positioning groove 17, and adjust the output length of each electric push rod 15 through the center position of the buckle to be tested, so that the center position of the opponent and the center position of the buckle to be tested coincide with each other, ensuring that the opponent and the buckle to be tested can be plugged in and out smoothly, and then screw the fixing bolts 19 into the threaded groove 18 in turn, and fix the opponent vertically through the positioning block 20 to ensure stability during the plugging and unplugging test.

[0051] Example 2:

[0052] like Figures 5-9 As shown, the present invention also provides an analysis method for a device for testing the insertion and extraction force of a snap fastener of an automobile plastic part, comprising the following steps:

[0053] Step 1: Fix the buckle to be tested in the plug-in control mechanism, obtain the center position of the buckle to be tested, and project the center position onto the surface of the fixed base 2 to obtain the fixed center position of the opponent;

[0054] Step 2: Adjust the fixture of the hand piece according to the fixed center position of the hand piece, fix the hand piece and obtain the pressure data of the tension and compression sensor 3. When the pressure data reaches the preset pressure threshold, a clamping position signal is generated;

[0055] Step 3: After obtaining the clamping position signal, the tension and compression sensor 3 is adjusted to zero, and the servo motor 23 is controlled to drive the clamping seat 4 to move up and down to perform the insertion and extraction force test;

[0056] The testing process is as follows:

[0057] Apply a -y direction displacement load to the top of the buckle to be tested, and then apply a rigid body constraint to the bottom component, such as Figure 6 As shown;

[0058] Extract the contact force in the y direction generated between the tested clip and the bottom hole during the installation process, during the first stage of the clip installation process and when the first stage of the locking barb is installed into the hole;

[0059] In the second stage of the installation process and the first stage of the locking barb, the top of the buckle to be tested contacts the bottom component to form a fixed structure. At this time, the stress distribution of the buckle to be tested and the stress of some nodes are as follows: Figure 7 As shown;

[0060] Step 4: Obtain the dimensional data of the counterpart and the buckle to be tested, use the Ansys Workbench environment, establish a three-dimensional finite element model through the system control module, import the dimensional data into the three-dimensional finite element model to establish a solid unit model, and divide the structural network. At the same time, obtain the real-time data of the tension and compression sensor 3 during the insertion and extraction force test, and analyze the strain test based on structural mechanics;

[0061] The specific process of strain testing based on structural mechanics analysis is as follows:

[0062] S101, obtaining the horizontal dimension data of the fixed base 2 and the horizontal height of the top surface of the fixed base 2, and establishing a three-dimensional coordinate system with the top surface of the fixed base 2 as the origin and the vertical surface where the device bracket 1 is located as the Z axis;

[0063] S102, obtaining dimensional data of the handpiece and the buckle to be tested, importing the dimensional data into a three-dimensional finite element model to establish a solid unit model, performing dynamic segmentation based on the distribution of stress and strain in the solid unit model structure, using a refined mesh in stress concentration areas and a conventional mesh in other areas;

[0064] S103. Obtain mechanical properties of the materials used for the counterpart and the buckle to be tested, including elastic modulus, Poisson's ratio, and density, and input them into the solid element model to ensure the accuracy of the solid element model;

[0065] S104. According to the requirements of the simulated static strain test, the fixing, constraint, and limited displacement conditions of the plastic buckle plug-in and pull-out structure are set. The output power of the servo motor 23 is controlled according to the requirements of the simulated static strain test, and the position of the slide 22 on the vertical track 21 is adjusted to adjust the position of the buckle to be tested, thereby realizing the insertion and removal action test of the buckle to be tested and the counterpart.

[0066] The specific operations during the test are as follows:

[0067] Based on the need to verify the results of the display dynamics analysis of the test buckle, and to reduce the difficulty of calculation, so that it can be analyzed using statics, the bottom member is optimized as shown in Figure 8 ;

[0068] The top end of the test buckle is fixedly constrained, and a remote displacement is applied to the two side tools to move them towards the center, and finally the distance between the two side tools is consistent with the original model;

[0069] When the distance between the two side structures becomes the original size, the display result is the limit position in the installation process of the display dynamics analysis, and the stress distribution result of the buckle at this time is shown in 9;

[0070] S105, obtaining the tension data of the tension sensor 3 in the test process, and calculating the strain distribution of the test buckle in the plugging test process according to the tension data.

[0071] Step five, based on the tension data obtained in the test process, strain analysis is performed according to the tension data, and the materials and structures of the buckle and the tool are optimized according to the strain trend.

[0072] The specific process of result analysis according to the tension data is as follows:

[0073] S201, obtaining the tension data Fi of the tension sensor 3 in the test process, and according to the tension data Fi and the elastic modulus of the test buckle, the deformation data AL of the test buckle in the plugging test process can be known;

[0074] The strain value of each position in the test buckle structure is calculated according to the following formula: , wherein L0 is the original deformation data of the surface of the test buckle;

[0075] S202, the strain value is input into the entity unit model, and the strain nephogram is obtained through simulation visualization processing, the stress concentration area is determined as the optimization area, different numerical strain values are divided into intervals according to the preset strain interval, strain values in the same interval are visually represented by the same color, and a strain nephogram with different color blocks is obtained;

[0076] S203, the strain nephogram is subjected to gray scale processing to obtain the gray scale values of different color blocks, a preset optimization threshold is obtained, color blocks with gray scale values greater than or equal to the optimization threshold are divided into the optimization area, i.e. the stress concentration area, which indicates that the optimization area has concentrated stress and has the risk of deformation exceeding the standard;

[0077] S204, based on the preset deformation prediction model, performing deformation prediction analysis, and sequentially inputting corresponding stress values in the optimizable region into the deformation prediction model; if the deformation prediction result output is that the deformation trend increases, the material and structure in the optimizable region are determined as the to-be-optimized region, and an optimization direction of the to-be-optimized region is selected based on existing materials and standby materials of the to-be-tested buckle.

[0078] The present application fixes the to-be-tested buckle in the plug-pull control mechanism, obtains the center point of the to-be-tested buckle, adjusts the counterpart tool clamp according to the fixed center point of the counterpart tool, obtains size data of the counterpart tool and the to-be-tested buckle, imports the size data into three-dimensional modeling software to establish a solid element model and divide a structure network, simultaneously obtains real-time data of the tension and compression sensor 3 in the plug-pull force test process, calculates the strain distribution of the to-be-tested buckle in the plug-pull test process according to the tension data, analyzes the performance of the buckle according to the strain trend, and further optimizes the material and structure of the buckle and the counterpart tool.

[0079] The size of the threshold is set for the purpose of comparison. The size of the threshold depends on the amount of sample data and the base number set by the person skilled in the art for each group of sample data. As long as the proportional relationship between the parameter and the quantized value is not affected, it is acceptable.

[0080] In the two embodiments provided in the present application, it should be understood that the disclosed device and system can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division. In actual implementation, another division mode can be used, for example, a plurality of modules or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed modules can be indirect coupling or communication connection through some interfaces, devices or modules, which can be electrical, mechanical or other forms.

[0081] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can make equivalent replacements or changes to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A test device for inserting and removing force of automobile plastic parts, comprising a fixed base, a device bracket and a tension and compression sensor, characterized in that: The device bracket is fixed on the top surface of the fixed base, and the top surface of the device bracket is fixed with an insertion and extraction control mechanism, which is used to fix the buckle to be tested and control the insertion and extraction force. The top surface of the fixed base is fixed with a counterpart fixture, which is used to fix the counterpart that matches the buckle to be tested, and the tension and compression sensor is fixed inside the counterpart fixture; The plug-in control mechanism includes a servo motor and a snap-on fixture. A vertical track is fixedly provided on one side surface of the device bracket. A slide is movably installed on the inner wall of the vertical track. The servo motor is fixedly provided on the outer surface of the vertical track. A ball screw is fixedly provided on the outer surface of the output end of the servo motor. The slide is movably sleeved on the outer surface of the ball screw. The snap-on fixture is fixedly provided on the outer surface of the slide. The snap clamp includes a clamping seat and a lateral clamping piece, the clamping seat is fixedly arranged on the outer surface of the slide, the top surface of the clamping seat is fixedly provided with a suction pump, the bottom surface of the clamping seat is fixedly provided with a vacuum suction cup, a suction pipe is commonly installed between the outer surface of the output end of the suction pump and the vacuum suction cup, and the lateral clamping piece is fixedly arranged on the outer surface of the clamping seat; The lateral clamping member includes a lateral support shaft, a plurality of radially distributed movable grooves are opened inside the clamping seat, a magnet shaft is movably connected to the inner wall of each movable groove, a return spring is installed between each magnet shaft and the corresponding movable groove, a plurality of electromagnets are fixed inside the clamping seat, each electromagnet corresponds to the magnet shaft one by one, one end of several lateral support shafts is respectively connected to the end surface of the magnet shaft, the other end of several lateral support shafts is connected to an elastic pressure block, and several lateral support shafts form a fixed inclination angle with the horizontal end surface; The hand piece clamp includes an electric push rod and a movable seat, and a plurality of adjustment grooves are radially distributed on the top surface of the fixed base. Several electric push rods are respectively fixed on the inner walls of the adjustment grooves, and several movable seats are respectively movably connected to the inner walls of the adjustment grooves. The output end of the electric push rod is connected to the outer surface of the movable seat, a positioning groove is provided on one side surface of the movable seat, a threaded groove is provided on the top surface of the movable seat, a fixing bolt is threadedly connected to the inner wall of the threaded groove, and a positioning block is connected to the top surface of the fixing bolt. The tension and compression sensor is fixed on the bottom surface of the positioning block.

2. An analysis method for a test device for inserting and removing force of a snap fastener of an automobile plastic part, using the test device for inserting and removing force of a snap fastener of an automobile plastic part as claimed in claim 1, characterized in that: The following steps are included: Step 1: Fix the buckle to be tested in the plug-in control mechanism, obtain the center position of the buckle to be tested, and project the center position onto the surface of the fixed base to obtain the fixed center position of the opponent; Step 2: Adjust the fixture of the hand piece according to the fixed center position of the hand piece, fix the hand piece and obtain the pressure data of the tension and compression sensor. When the pressure data reaches the preset pressure threshold, a clamping position signal is generated; Step 3: After obtaining the clamping position signal, adjust the tension and compression sensors to zero, and then control the servo motor to drive the clamping seat to move up and down to perform the insertion and extraction force test; Step 4: Obtain the dimensional data of the counterpart and the buckle to be tested. Using the Ansys Workbench environment, establish a 3D finite element model through the system control module. Import the dimensional data into the 3D finite element model to establish a solid unit model and divide the structural network. Simultaneously, obtain real-time data from the tension and compression sensors during the insertion and extraction force test, and perform strain testing based on structural mechanics analysis. Step 5: Obtain tensile force data based on the test process, perform strain analysis based on the tensile force data, and optimize the materials and structures of the buckle and the counterpart according to the strain trend.

3. The analysis method of the automotive plastic parts buckle insertion and extraction force testing device according to claim 2, characterized in that: The specific process of strain testing based on structural mechanics analysis is as follows: S101, obtaining horizontal dimension data of the fixed base and the horizontal height of the top surface of the fixed base, and establishing a three-dimensional coordinate system with the top surface of the fixed base as the origin and the vertical surface where the device bracket is located as the Z axis; S102, obtaining dimensional data of the handpiece and the buckle to be tested, importing the dimensional data into a 3D modeling software to establish a solid unit model, performing dynamic segmentation based on the distribution of stress and strain in the solid unit model structure, using a refined mesh in stress concentration areas and a conventional mesh in other areas; S103, obtaining mechanical properties of the materials used for the counterpart and the buckle to be tested, including elastic modulus, Poisson's ratio, and density, and inputting them into the solid unit model to ensure the accuracy of the solid unit model; S104. According to the requirements of the simulated static strain test, the fixing, constraint, and limited displacement conditions of the plastic buckle plug-in and pull-out structure are set. The output power of the servo motor is controlled according to the requirements of the simulated static strain test, and the position of the slide on the vertical track is adjusted to adjust the position of the buckle to be tested, thereby realizing the insertion and removal action test of the buckle to be tested and the counterpart. S105 , obtaining tension data obtained by the tension and compression sensors during the test process, and calculating the strain distribution of the buckle to be tested during the plugging and unplugging test process based on the tension data.

4. The analysis method of the automotive plastic part buckle insertion and extraction force testing device according to claim 2, characterized in that: The specific process of analyzing the results based on the tensile data is as follows: S201, obtaining the tension data Fi obtained by the tension and compression sensor (3) during the test process, and knowing the deformation data ΔL of the buckle to be tested during the plug-in test process based on the tension data Fi and the elastic modulus of the buckle to be tested; Calculate the strain value at each position in the buckle structure to be tested according to the following formula: , where L0 is the original deformation data of the surface of the buckle to be tested; S202: Enter the strain value into the solid element model, obtain a strain cloud map through simulation visualization processing, identify the stress concentration area as the optimization area, divide the strain values ​​of different values ​​into intervals according to the preset strain division intervals, and use the same color for visualization of the strain values ​​in the same interval to obtain a strain cloud map with different color blocks; S203: grayscale processing is performed on the strain cloud map to obtain grayscale values ​​of different color blocks, and a preset optimization threshold is obtained. Color blocks with grayscale values ​​greater than or equal to the optimization threshold are divided into optimizable areas, i.e., stress concentration areas, indicating that stress in the optimizable areas is concentrated and there is a risk of excessive deformation. S204. Perform deformation prediction analysis based on a preset deformation prediction model, and substitute the corresponding stress values ​​in the optimizable area into the deformation prediction model one by one. If the deformation prediction result outputs an increasing deformation trend, the material and structure in the optimizable area are determined as the area to be optimized. The optimization direction of the area to be optimized is screened based on the existing materials and spare materials of the buckle to be tested.

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