Device and method for testing rigidity of automobile control arm

Abstract

The invention provides an automobile control arm rigidity testing device and testing method. Relates to the technical field of automobile part testing. The rigidity testing device for the automobile control arm comprises a testing table and a supporting side plate fixedly installed at the top of the testing table, a vertical connecting frame is fixedly installed on one side of the supporting side plate, a first lifting lead screw is rotatably installed in the vertical connecting frame, a linkage arm is slidably installed on the first lifting lead screw, and a second lifting lead screw is rotatably installed on the linkage arm. The linkage arm penetrates through the supporting side plate and is in sliding connection with the supporting side plate, a mounting frame is fixedly mounted on one side of the linkage arm, and a plurality of first hydraulic cylinders are fixedly mounted on the inner wall of the bottom of the mounting frame; output shafts of the multiple first hydraulic cylinders all extend to the position below the mounting frame and are in sliding connection with the bottom of the mounting frame. The method has the advantages of being high in testing efficiency and capable of being suitable for batch production procedures.

Description

Technical Field

[0001] The invention relates to the technical field of automobile component testing, and in particular to an automobile control arm stiffness testing device and a testing method. Background Art

[0002] The automobile control arm is an important part of the automobile suspension system. Its main function is to effectively transmit various forces on the wheels to the body and ensure that the wheels move along the predetermined trajectory. Therefore, this type of control arm is related to the stability and handling stability of the car. Therefore, in the production process of the control arm, in order to ensure that it has good self-strength, it is generally subjected to a stiffness test before leaving the factory. The strength of the stiffness can distinguish the ability of the control arm to resist elastic deformation when subjected to force. Common stiffness testing methods include tensile tests, bending tests, and torsion tests. When conducting a tensile test on the control arm, a special tensile testing machine is usually used for testing. This tensile testing machine is usually composed of a main unit, an electrical control box, and measuring, display, and recording devices. It can display data in real time and draw tensile curves.

[0003] However, it is found during the use of common tensile testing machines that since only one control arm can be tested each time the tensile test is performed, when multiple batches and multiple batches of control arms need to be tested, it takes a long time to test, and the test efficiency is relatively low, which makes it difficult to meet the needs of assembly line-style large-volume testing.

[0004] Therefore, it is necessary to provide a new automobile control arm stiffness testing device and testing method to solve the above technical problems. Summary of the invention

[0005] The object of the present invention is to provide a vehicle control arm stiffness testing device and a testing method which have high testing efficiency and can be applied to batch production processes.

[0006] To solve the above technical problems, the automobile control arm stiffness measurement provided by the present invention includes a test bench and a support side plate fixedly installed on the top of the test bench. A vertical connection frame is fixedly installed on one side of the support side plate. A first lifting lead screw is rotatably installed in the vertical connection frame. A linkage arm is slidably installed on the first lifting lead screw. The linkage arm penetrates through the support side plate and is slidably connected to the support side plate. An installation frame is fixedly installed on one side of the linkage arm. A plurality of first hydraulic cylinders are fixedly installed on the bottom inner wall of the installation frame. The output shafts of the plurality of first hydraulic cylinders all extend below the installation frame and are slidably connected to the bottom of the installation frame. A U-shaped frame is provided below the output shafts of the plurality of first hydraulic cylinders. Second hydraulic cylinders are fixedly installed on both sides of the plurality of U-shaped frames. The output shafts of the plurality of second hydraulic cylinders all extend into the corresponding U-shaped frames and are slidably connected to the corresponding U-shaped frames. First transverse clamping pieces are fixedly installed on the output shafts of the plurality of second hydraulic cylinders. An internally threaded sleeve is rotatably installed on the test bench. A second lifting lead screw is installed in the internally threaded sleeve by internal threading. A horizontal connection frame is fixedly installed on one side of the support side plate. A transmission lead screw is rotatably installed in the horizontal connection frame. A transverse moving plate is installed on the transmission lead screw by threading. A support cross bench is fixedly installed on one side of the transverse moving plate. The support cross bench penetrates through the support side plate and is slidably connected to the support side plate. Support columns are fixedly installed at the top of the second lifting lead screw and the top of the support cross bench. Retaining mechanisms are provided at the top of the two support columns for clamping and positioning the bottom of the control arm.

[0007] Preferably, any one of the retaining mechanisms includes a load-carrying frame body. A plurality of positioning sockets are opened on the top of the load-carrying frame body. Positioning plugs are inserted into the plurality of positioning sockets. Concave seats are fixedly installed on the tops of the plurality of positioning plugs. Third hydraulic cylinders are fixedly installed on the outer walls on both sides of the plurality of concave seats. The output shafts of the plurality of third hydraulic cylinders all extend into the corresponding concave seats and are slidably connected to the corresponding concave seats. Second transverse clamping pieces are fixedly installed on the output shafts of the plurality of third hydraulic cylinders.

[0008] Preferably, a through groove is opened on one side of the plurality of concave seats. A positive and negative lead screw is rotatably installed in each of the plurality of through grooves. Two movable arms are installed on each of the positive and negative lead screws by threading. The tops of the plurality of movable arms all extend into the corresponding concave seats and are slidably connected to the top inner wall of the corresponding through groove. A blocking plate is fixedly installed on the side where the two corresponding movable arms are close to each other.

[0009] Preferably, arc-shaped through holes are formed in each of the plurality of positioning sockets. A same rotating shaft is rotatably installed on both sides of the load-carrying frame body. One end of the rotating shaft extends outside the load-carrying frame body. A plurality of arc-shaped through rods are fixedly installed on the rotating shaft. The plurality of arc-shaped through rods respectively penetrate through the plurality of arc-shaped through holes and are slidably connected to the inner walls of the corresponding arc-shaped through holes.

[0010] Preferably, a connecting piece is fixedly installed on an outer wall of one side of the load-carrying frame body. An arc-shaped sliding rod is fixedly installed on the connecting piece. A compression spring piece is slidably installed on the arc-shaped sliding rod. The bottom of the compression spring piece is fixedly connected to the rotating shaft. A return spring is sleeved on the arc-shaped sliding rod. One end of the return spring is fixedly connected to the connecting piece, and the other end is fixedly connected to the compression spring piece.

[0011] Preferably, fixed connection blocks are fixedly installed on the output shafts of the plurality of first hydraulic cylinders. T-shaped sliding grooves are formed in the plurality of fixed connection blocks. T-shaped sliding blocks are slidably installed in the plurality of T-shaped sliding grooves, and the plurality of T-shaped sliding blocks are respectively fixedly connected to the corresponding fixed connection blocks through bolts. The bottoms of the plurality of T-shaped sliding blocks are respectively fixedly connected to the plurality of U-shaped frames.

[0012] Preferably, a first servo motor is fixedly installed at the top of the vertical connection frame. The output shaft of the first servo motor is fixedly connected to the top end of the first lifting lead screw. A first vertical support plate and a second vertical support plate are fixedly installed at the bottom of the test bench. A first folding plate is fixedly installed on the first vertical support plate. One end of the transmission lead screw penetrates through the first folding plate and is rotatably connected to the first folding plate. Two first stabilizing plates are fixedly installed on one side of the first folding plate close to the support side plate. A same first transmission shaft is rotatably installed on the two first stabilizing plates. Two second stabilizing plates are fixedly installed at the bottom of the test bench. A same second transmission shaft is rotatably installed on the two second stabilizing plates. The second transmission shaft penetrates through the first vertical support plate and is movably connected to the first vertical support plate. A same first bevel gear is fixedly sleeved on the transmission lead screw and the first transmission shaft. The two first bevel gears are meshed with each other. Second bevel gears are fixedly sleeved on the first transmission shaft and the second transmission shaft. The two second bevel gears are meshed with each other. Third bevel gears are fixedly sleeved on the second transmission shaft and the internal thread sleeve. The two third bevel gears are meshed with each other. A second servo motor is fixedly installed on one side of the first folding plate. The output shaft of the second servo motor is fixedly connected to one end of the transmission lead screw.

[0013] Preferably, two cross arms are fixedly installed on the side of the second vertical support plate away from the first vertical support plate, and the same second folding plate is fixedly installed on the side of the two cross arms away from the second vertical support plate, and two steering shafts are rotatably installed on the top of the second folding plate, and stabilizing plates are fixedly installed on the two steering shafts, and the first cylinders are fixedly installed on the sides of the two stabilizing plates away from each other, and joint plates are fixedly installed on the output shafts of the two first cylinders, and simulation box covers are fixedly installed on one side of the two joint plates, the two simulation box covers are in contact with each other, and one of the clamping mechanisms is located inside the two simulation box covers, and a plurality of heating pipes are fixedly installed on the inner walls of the two simulation box covers away from each other, and a third servo motor is fixedly installed on the top of the second folding plate, and a first circular gear is fixedly installed on the output shaft of the third servo motor, and a second circular gear is fixedly sleeved on one of the steering shafts, and the first circular gear is meshed with the second circular gear, and a third circular gear is fixedly sleeved on the two steering shafts, and the two third circular gears are meshed, and a thermometer is fixedly installed on one of the simulation box covers.

[0014] Preferably, a cooling fan is fixedly installed on the cross arm located at the top, an air distribution duct is fixedly installed on the air outlet of the cooling fan, a first air duct is arranged above the horizontal connecting frame, one end of a first connecting duct is fixedly installed on the air distribution duct, the other end of the first connecting duct is fixedly connected to the first air duct, a plurality of first air outlet nozzles are fixedly installed on the bottom of the first air duct, a second air duct is provided below the supporting cross platform, a plurality of second air outlet nozzles are fixedly installed on the bottom of the second air duct, one end of a second connecting duct is fixedly installed on the air distribution duct, one end of a corrugated pipe is fixedly installed on the other end of the second connecting pipe, and the other end of the corrugated pipe is fixedly connected to the second air duct, a back side standing plate is fixedly installed on the cross arm located at the top, a second cylinder is fixedly installed on the back side standing plate, an output shaft of the second cylinder passes through the back side standing plate and is slidably connected to the back side standing plate, a frame connecting arm is fixedly installed on the output shaft of the second cylinder, one side of the frame connecting arm is fixedly connected to the second air duct, a first valve is provided on the first connecting duct, and a second valve is provided on the second connecting duct.

[0015] The present invention also provides a method for testing the stiffness of an automobile control arm, comprising the following steps:

[0016] S1. Placing the control arms: rotating the corresponding forward and reverse screws to make the corresponding two movable arms move relative to each other, so as to adjust the distance between the two shift plates. After the adjustment, the other shift plates are adjusted in the same way. Then, multiple control arms are taken out and respectively placed in multiple concave seats in the two clamping mechanisms. The output shafts of multiple third hydraulic cylinders are started to extend, and the lower end portions of the multiple control arms are clamped by the second transverse clamping piece.

[0017] S2. Conduct a tensile test: Start the first servo motor in the forward direction, and the linkage arm drives the mounting frame to descend, so that the upper parts of multiple control arms enter the corresponding U-shaped frames. Start the output shafts of multiple second hydraulic cylinders to extend, clamp the upper parts of the control arms, and start the output shafts of multiple first hydraulic cylinders to retract. During the retraction process, the control arms are stressed and the stress changes. The values during the change process will be displayed by an external computer device.

[0018] S3. Replace the control arm: Start the output shaft of the second hydraulic cylinder to retract to loosen the control arm, start the first servo motor in the reverse direction to bring the U-shaped frame back to its original position, start the second servo motor in the forward direction, and the cross-moving plate drives the support cross-table to move horizontally. At the same time, through the meshing transmission of two first bevel gears, two second bevel gears and two third bevel gears, the internally threaded sleeve rotates, and the second lifting lead screw drives the clamping mechanism thereon to rise. Finally, the position where the clamping mechanism on the second lifting lead screw is located replaces the position where the clamping mechanism on the original support cross-table was located. While continuing the tensile test, remove the control arms that have completed the test and replace them with the next batch of control arms to be tested. After waiting for the previous batch of control arms to complete the test, start the second servo motor in the reverse direction, and the support cross-table moves downward below the U-shaped frame. At the same time, the second lifting lead screw drives the corresponding clamping mechanism to descend, and once again, the two clamping mechanisms form a position replacement, and then the stiffness test work is carried out, and so on until all the test work is completed.

[0019] Compared with the related technology, the automobile control arm stiffness test device and test method provided by the present invention have the following beneficial effects:

[0020] First, through the multiple U-shaped frames provided and the multiple concave seats provided on the clamping mechanism, the tensile test work can be carried out on multiple control arms to be tested at the same time, thereby improving the test efficiency.

[0021] Second, by providing two sets of clamping mechanisms that can replace positions, when the tensile test is completed on one side, the next batch of fixed control arms to be tested can be quickly moved below the U-shaped frame and quickly enter the next test process, thereby further improving the test efficiency of the control arms.

[0022] Third, through the control of a single second servo motor and the meshing transmission of multiple transmission components, the two sets of clamping mechanisms can achieve the position replacement between each other only through one driving component, which can reduce the number of electrical components used and reduce the power consumption and cost. Description of the Drawings

[0023] Figure 1A schematic structural diagram of a first embodiment of a vehicle control arm stiffness testing device provided by the present invention;

[0024] Figure 2 A front plan view structural diagram of a first embodiment of a vehicle control arm stiffness testing device provided by the present invention;

[0025] Figure 3 A schematic structural diagram of a transmission screw in a first embodiment of a vehicle control arm stiffness testing device provided by the present invention;

[0026] Figure 4 A schematic diagram of the connection structure between the first hydraulic cylinder and the shaped frame in the first embodiment of the vehicle control arm stiffness testing device provided by the present invention;

[0027] Figure 5 A schematic diagram of the connection structure of the U-shaped frame and the fixing block in the first embodiment of the vehicle control arm stiffness testing device provided by the present invention;

[0028] Figure 6 A schematic diagram of the assembly of the object-carrying frame and the concave seat in the first embodiment of the vehicle control arm stiffness testing device provided by the present invention;

[0029] Figure 7 A schematic diagram of the structure of the positioning socket in the first embodiment of the vehicle control arm stiffness testing device provided by the present invention;

[0030] Figure 8 A schematic structural diagram of a concave seat in a first embodiment of a vehicle control arm stiffness testing device provided by the present invention;

[0031] Fig. 9 A schematic diagram of the connection structure of the forward and reverse lead screws and the movable arm in the first embodiment of the vehicle control arm stiffness testing device provided by the present invention;

[0032] Fig.10 A schematic structural diagram of a second embodiment of a vehicle control arm stiffness testing device provided by the present invention;

[0033] Fig.11 A rear structural schematic diagram of a second embodiment of the vehicle control arm stiffness testing device provided by the present invention;

[0034] Fig.12 A schematic diagram of the opening state of two simulated box covers in the second embodiment of the vehicle control arm stiffness testing device provided by the present invention;

[0035] Fig.13 A schematic diagram of the connection structure between the second deflection plate and the steering shaft in the second embodiment of the vehicle control arm stiffness testing device provided by the present invention;

[0036] Fig.14Schematic diagram of the upward view of two steering shafts in the second embodiment of the vehicle control arm stiffness testing device provided by the present invention;

[0037] Fig.15 Schematic diagram of the installation structure of the heating tube in the second embodiment of the vehicle control arm stiffness testing device provided by the present invention;

[0038] Fig.16 Assembly schematic diagram of the first connecting pipe and the second connecting pipe in the second embodiment of the vehicle control arm stiffness testing device provided by the present invention.

[0039] Reference numerals in the figure: 1, test bench; 2, support side plate; 3, vertical connection frame; 4, first lifting lead screw; 5, linkage arm; 6, installation frame; 7, first hydraulic cylinder; 8, U-shaped frame; 9, second hydraulic cylinder; 10, first transverse clip; 11, fixing block; 12, T-shaped slider; 13, internal thread sleeve; 14, second lifting lead screw; 15, transverse connection frame; 16, transmission lead screw; 17, transverse moving plate; 18, support cross bench; 19, support column; 20, load-bearing frame; 21, positioning socket; 22, positioning plug; 23, concave seat; 24, third hydraulic cylinder; 25, second transverse clip; 26, through groove; 27, positive and negative lead screw; 28, movable arm; 29, blocking plate; 30, arc-shaped perforation; 31, rotating shaft; 32, arc-shaped through rod; 33, connecting piece; 34, arc-shaped slide bar; 35, compression spring piece; 36, return spring; 37, first folding plate; 38, first transmission shaft; 39, second transmission shaft; 40, first bevel gear; 41, second bevel gear; 42, third bevel gear; 43, second folding plate; 44, steering shaft; 45, stabilizing piece; 46, first cylinder; 47, connecting plate; 48, simulation box cover; 49, heating tube; 50, cold air blower; 51, air duct; 52, first connecting pipe; 53, first air duct; 54, first air outlet nozzle; 55, second air duct; 56, second air outlet nozzle; 57, second connecting pipe; 58, back side stand plate; 59, second cylinder; 60, bridging arm; 61, bellows. Detailed implementation manners

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] First embodiment:

[0042] Please refer to Figure 1-Figure 9, in the first embodiment of the present invention, an automobile control arm stiffness testing device includes: a test bench 1 and a support side plate 2 fixed on the top of the test bench 1. A vertical connection frame 3 is fixed on one side of the support side plate 2, and a first lifting lead screw 4 is rotatably installed therein. A first servo motor is fixed on the top of the vertical connection frame 3, and its output shaft is fixedly connected to the top end of the first lifting lead screw 4. A linkage arm 5 is slidably installed on the first lifting lead screw 4. The linkage arm 5 penetrates the support side plate 2, and a first sliding opening is formed on the support side plate 2. The linkage arm 5 passes through the first sliding opening and contacts the inner wall of the first sliding opening, thereby forming a sliding relationship with the support side plate 2. An installation frame 6 is fixed on one side of the linkage arm 5. A plurality of first hydraulic cylinders 7 are fixed on the bottom inner wall of the installation frame 6. The output shafts of the plurality of first hydraulic cylinders 7 all extend below the installation frame 6 and are slidably connected to the bottom of the installation frame 6. And fixing blocks 11 are fixed on the output shafts of the plurality of first hydraulic cylinders 7. T-shaped sliding grooves are formed on the plurality of fixing blocks 11. T-shaped sliding blocks 12 are slidably installed in the plurality of T-shaped sliding grooves, and the plurality of T-shaped sliding blocks 12 are all fixedly connected to the corresponding fixing blocks 11 by bolts. The bottoms of the plurality of T-shaped sliding blocks 12 are all fixed with U-shaped frames 8, which can facilitate the replacement of the first transverse clamping piece 10 mentioned below. Second hydraulic cylinders 9 are fixed on both sides of the plurality of U-shaped frames 8. The output shafts of the plurality of second hydraulic cylinders 9 all extend into the corresponding U-shaped frames 8 and are slidably connected to the corresponding U-shaped frames 8. First transverse clamping pieces 10 are fixed on the output shafts of the plurality of second hydraulic cylinders 9. The first transverse clamping piece 10 can clamp and fix the upper end part of the control arm. An internal thread sleeve 13 is rotatably installed on the test bench 1, and a second lifting lead screw 14 is installed with internal threads in the internal thread sleeve 13. A transverse connection frame 15 is fixed on one side of the support side plate 2. A transmission lead screw 16 is rotatably installed in the transverse connection frame 15, and a transverse moving plate 17 is installed with threads on the transmission lead screw 16. In order to ensure that the transverse moving plate 17 can only move linearly, two transverse limiting rods are fixed in the transverse connection frame 15. Both transverse limiting rods penetrate the transverse moving plate 17 and are slidably connected to it. A support cross bench 18 is fixed on one side of the transverse moving plate 17. And a second sliding opening is formed on the support side plate 2. The support cross bench 18 passes through the second sliding opening, and the diameter of the second sliding opening is relatively large, so that the clamped control arm can also pass through it. Support columns 19 are fixed on the top ends of the second lifting lead screw 14 and the top of the support cross bench 18 respectively. Retaining mechanisms are provided at the top ends of the two support columns 19 to clamp and position the bottom of the control arm. And a reinforcing column for stability is also fixed on the support cross bench 18, and the reinforcing column is located on one side of the corresponding support column 19.

[0043] Any one of the retaining mechanisms includes a loading frame 20, a plurality of positioning sockets 21 are provided on the top of the loading frame 20, a positioning socket 22 is inserted into the plurality of positioning sockets 21, a concave seat 23 is fixed on the top of the plurality of positioning sockets 22, a third hydraulic cylinder 24 is fixed on the outer walls on both sides of the plurality of concave seats 23, the output shafts of the plurality of third hydraulic cylinders 24 extend into the corresponding concave seats 23 and are slidably connected with the corresponding concave seats 23, a second transverse clamp 25 is fixed on the output shafts of the plurality of third hydraulic cylinders 24, and the lower end portion of the control arm can be clamped and fixed by the cooperation of the second transverse clamp 25 and the third hydraulic cylinder 24, so that the control arm can be tensile tested when the output shaft of the first hydraulic cylinder 7 is retracted.

[0044] In the above manner, in order to form a front and rear limit for the control arm so that it will tilt out when placed in the concave seat 23, a plurality of concave seats 23 are provided with a leading groove 26 on one side, and a plurality of leading grooves 26 are rotatably installed with forward and reverse screws 27, and two movable arms 28 are threadedly installed on the plurality of forward and reverse screws 27, and the tops of the plurality of movable arms 28 extend into the corresponding concave seats 23 and are slidably connected to the corresponding inner walls of the tops of the leading grooves 26, and a shift plate 29 is fixed on the sides of the two corresponding movable arms 28 that are close to each other, and in order to facilitate the replacement of the second transverse clip 25, arc-shaped through holes 30 are provided on the plurality of positioning sockets 22, and the same rotating shaft 31 is rotatably installed on both sides of the object-carrying frame 20, and one end of the rotating shaft 31 extends The arc-shaped through-rods 32 are fixed to the outside of the object-carrying frame 20 and are screwed thereon. The arc-shaped through-rods 32 are respectively passed through the arc-shaped through-holes 30 and are slidably connected to the inner walls of the corresponding arc-shaped through-holes 30. A connecting piece 33 is fixed to the outer wall of one side of the object-carrying frame 20. An arc-shaped sliding rod 34 is fixed to the connecting piece 33. A compression spring piece 35 is slidably installed on the arc-shaped sliding rod 34. The bottom of the compression spring piece 35 is fixedly connected to the rotating shaft 31. A return spring 36 is sleeved on the arc-shaped sliding rod 34. One end of the return spring 36 is fixedly connected to the connecting piece 33, and the other end is fixedly connected to the compression spring piece 35. During operation, the arc-shaped through-rods 32 and the arc-shaped through-holes 30 can be separated by rotating the rotating shaft 31, so that the concave seat 23 can be quickly replaced.

[0045] In this method, in order to enable the transmission screw 16 and the internal threaded sleeve 13 to rotate simultaneously and reduce the number of electrical components used, a first vertical support plate and a second vertical support plate are fixed to the bottom of the test bench 1, and a first folding plate 37 is fixed to the first vertical support plate. One end of the transmission screw 16 is set to pass through the first folding plate 37 and is rotatably connected to the first folding plate 37, and two first stabilizing plates are fixed on one side of the first folding plate 37 close to the supporting side plate 2, and the same first transmission shaft 38 is rotatably installed on the two first stabilizing plates. Two second stabilizing plates are fixed to the bottom of the test bench 1, and the same second transmission shaft 39 is rotatably installed on the two second stabilizing plates. The second transmission shaft 39 passes through the first vertical support plate and is movably connected to the first vertical support plate. 6 and the first transmission shaft 38 are fixedly sleeved with the same first bevel gear 40, and the two first bevel gears 40 are meshed with each other. The first transmission shaft 38 and the second transmission shaft 39 are both fixedly sleeved with a second bevel gear 41, and the two second bevel gears 41 are meshed with each other. The second transmission shaft 39 and the internal threaded sleeve 13 are both fixedly sleeved with a third bevel gear 42, and the two third bevel gears 42 are meshed with each other. A second servo motor is fixedly mounted on one side of the first folding plate 37, and its output shaft is fixedly connected to one end of the transmission screw 16. In addition, a vertical limit rod is slidably installed on the test bench 1, and the top end of the vertical limit rod is fixed to the object loading frame 20 in the corresponding clamping mechanism, thereby limiting it, so that the second lifting screw 14 can only be linearly lifted and lowered with the corresponding clamping mechanism.

[0046] In this embodiment:

[0047] In the initial state, the output shaft of the first hydraulic cylinder 7 is in an extended state, and the device is used in conjunction with an external electronic computer device to obtain the test data;

[0048] When the control arm needs to be tested for tensile stiffness, the spacing between the two corresponding shift plates 29 is first adjusted according to the width of the control arm. During the adjustment, the corresponding forward and reverse lead screws 27 are directly rotated to make the two corresponding movable arms 28 move relative to each other, thereby changing the spacing between the two shift plates 29 until the spacing is adjusted to the specified spacing, and then the other shift plates 29 are adjusted in the same way.

[0049] Then, take out multiple control arms and place them respectively in the multiple concave seats 23 within the two clamping mechanisms. Immediately start the output shafts of multiple third hydraulic cylinders 24 to extend. Use the second transverse clamping piece 25 to clamp the lower parts of the multiple control arms. Then, start the first servo motor in the forward direction. Its output shaft drives the first lifting lead screw 4 to rotate. At this time, due to the threaded fit between the first lifting lead screw 4 and the linkage arm 5, the linkage arm 5 drives the mounting frame 6 to descend until the upper parts of the multiple control arms enter the corresponding U-shaped frames 8, then turn off the first servo motor. Immediately, start the output shafts of multiple second hydraulic cylinders 9 to extend. The two corresponding first transverse clamping pieces 10 will move closer to each other and finally clamp the upper parts of the control arms. Subsequently, start the output shafts of multiple first hydraulic cylinders 7 to retract. During the retraction process, the control arms will be subjected to tensile force and undergo stress changes. Moreover, the values during the change process will be displayed through an external electronic computer device, thus forming a testing process;

[0050] After the testing of the multiple control arms located above the support cross-table 18 is completed, start the output shafts of the second hydraulic cylinders 9 to retract to loosen the control arms. Immediately, start the first servo motor in the reverse direction to bring the U-shaped frame 8 back to its original position. Then, start the second servo motor in the forward direction. Its output shaft drives the transmission lead screw 16 to rotate. Due to its threaded fit with the cross-moving plate 17, the cross-moving plate 17 drives the support cross-table 18 to move horizontally, so that the clamping mechanism on the support cross-table 18 passes through the support side plate 2. And during the operation of the second servo motor, through the meshing transmission of two first bevel gears 40, two second bevel gears 41, and two third bevel gears 42, the internal threaded sleeve 13 can be driven to rotate. At this time, due to its threaded fit with the second lifting lead screw 14, the second lifting lead screw 14 drives the clamping mechanism thereon to rise until the cross-moving plate 17 moves to the final position and then turn off the second servo motor. At this time, the position where the clamping mechanism on the second lifting lead screw 14 is located replaces the position where the clamping mechanism on the original support cross-table 18 was located. Then, in the same way, use the first transverse clamping piece 10 to fix the next batch of control arms and continue the tensile test;

[0051] On the other side, remove the control arms that have completed the test, replace them with the next batch of control arms to be tested, and wait until the testing of the previous batch of control arms is completed. Then, start the second servo motor in the reverse direction, so that the support cross-table 18 moves downward again below the U-shaped frame 8. At the same time, the second lifting lead screw 14 drives the corresponding clamping mechanism to descend, thus enabling the two clamping mechanisms to form a position replacement again, and repeating this process to achieve rapid testing work;

[0052] In subsequent use, when the first transverse clamp 10 and the second transverse clamp 25 need to be replaced due to wear, the thread between the T-shaped slider 12 and the fixing block 11 can be directly removed to directly replace the convex frame 8, thereby completing the replacement of the first transverse clamp 10. Then, when replacing the second transverse clamp 25, the rotating shaft 31 is directly rotated clockwise to rotate the multiple arc-shaped penetration rods 32 out of the corresponding arc-shaped through holes 30. At this time, the corresponding return spring 36 is compressed by the compression spring sheet 35. Then, the concave seat 23 can be directly lifted out together with the positioning socket 22, and the positioning socket 22 at the bottom of the new concave seat 23 can be inserted into the positioning socket 21. Then, the rotating shaft 31 is loosened, and the compressed return spring 36 releases the elastic force, directly bringing the multiple arc-shaped penetration rods 32 into the corresponding arc-shaped through holes 30, thereby completing the replacement of the second transverse clamp 25.

[0053] Compared with the related art, the vehicle control arm stiffness testing device provided by the present invention has the following beneficial effects:

[0054] 1. By providing a plurality of U-shaped frames 8 and a plurality of concave seats 23 on the clamping mechanism, a plurality of control arms to be tested can be subjected to tensile testing at the same time, thereby improving the testing efficiency;

[0055] Second, by setting up two sets of clamping mechanisms that can change positions, when one side completes the tensile test, the next batch of control arms that have been fixed to be tested can be quickly moved to the bottom of the U-shaped frame 8, and quickly enter the next test process, thereby further improving the test efficiency of the control arms;

[0056] 3. Through the control of a single second servo motor and the meshing transmission of multiple transmission components, the two sets of clamping mechanisms only need one driving component to achieve the position replacement between each other, which can reduce the number of electrical components used and reduce electricity and usage costs.

[0057] Second embodiment:

[0058] Based on the vehicle control arm stiffness test device provided in the first embodiment of the present application, the second embodiment of the present application provides another vehicle control arm stiffness test device. The second embodiment is only a preferred embodiment of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

[0059] The second embodiment of the present invention is further described below in conjunction with the accompanying drawings and implementation modes.

[0060] Please refer to Figure 10-Figure 16The vehicle control arm stiffness test device also includes two cross arms, which are fixed on the side of the second vertical support plate away from the first vertical support plate. The same second folding plate 43 is fixed on the side of the two cross arms away from the second vertical support plate. Two steering shafts 44 are rotatably installed on the top of the second folding plate 43. Stable plates 45 are fixed on the two steering shafts 44. The first cylinders 46 are fixed on the sides of the two stable plates 45 away from each other. Joint plates 47 are fixed on the output shafts of the two first cylinders 46. Simulated box covers 48 are fixed on one side of the two joint plates 47. The two simulated box covers 48 are in contact with each other, and one of the clamping mechanisms is in the two simulated box covers 48 during the test. In addition, in order to ensure that the simulated box covers 48 can fit perfectly, the two simulated box covers 48 are fixed with a clamping mechanism. Semicircular holes and grooves are provided on the two support columns 19, multiple output shafts of the first hydraulic cylinders 7, vertical limit rods and reinforcing columns. When the two simulation box covers 48 are in contact, these semicircular holes and grooves are closed. Multiple heating tubes 49 are fixed on the inner walls of the two simulation box covers 48 on the side away from each other to generate a high-temperature environment, and the high-temperature environment is not higher than 100 degrees Celsius. A thermometer is fixed on one of the simulation box covers 48 to provide a temperature reminder to the staff. A third servo motor is fixed on the top of the second folding plate 43, and a first circular gear is fixed on its output shaft. A second circular gear is fixedly sleeved on one of the steering shafts 44, and the first circular gear is meshed with the second circular gear. A third circular gear is fixedly sleeved on both steering shafts 44, and the two third circular gears are meshed with each other.

[0061] In the above method, in order to quickly cool down the control arm that has been subjected to a high-temperature test, an air cooler 50 is fixed on the upper cross arm, and an air distribution duct 51 is fixed on the air outlet thereof. A first air duct 53 is provided above the transverse connecting frame 15, and one end of a first connecting pipe 52 is fixed to the air distribution duct 51, and the other end of the first connecting pipe 52 is fixedly connected to the first air distribution duct 53. A plurality of first air outlet nozzles 54 are fixed to the bottom of the first air distribution duct 53, and a second air distribution duct 55 is provided below the supporting cross platform 18, and a plurality of second air outlet nozzles 56 are fixed to the bottom of the second air distribution duct 55. One end of the second connecting pipe 57 and the other end of the second connecting pipe 57 are fixed with one end of a bellows 61, and the other end of the bellows 61 is fixedly connected to the second air duct 55. A back stand plate 58 is fixed on the upper crossbeam, and a second cylinder 59 is fixed on the back stand plate 58, and its output shaft passes through the back stand plate 58 and is slidably connected to the back stand plate 58. A frame arm 60 is fixed on the output shaft of the second cylinder 59, and one side of the frame arm 60 is fixedly connected to the second air duct 55. A first valve is provided on the first connecting pipe 52, and a second valve is provided on the second connecting pipe 57, so as to control the ejection position of the cold air.

[0062] In this embodiment:

[0063] In the initial state, the two simulated box covers 48 are in a rotated and opened state;

[0064] During the test, in order to simulate the situation where the control arm gets heated during the driving process of the vehicle, so as to improve the diversity and authority of the test results, before testing the control arm, the third servo motor can be started forward. Through the meshing of the first circular gear and the second circular gear, the corresponding steering shaft 44 can be driven to rotate. At the same time, under the meshing of the two third circular gears, the two steering shafts 44 rotate simultaneously and in opposite directions, causing the two simulated box covers 48 to gradually rotate and approach. After the two simulated box covers 48 rotate to a parallel state, the third servo motor is turned off. Immediately, the output shafts of the two first cylinders 46 are extended, causing the two simulated box covers 48 to approach each other and finally fit together. At this time, the multiple control arms to be tested are located inside the two simulated box covers 48. Then, multiple heating tubes 49 are started to generate heat. The thermometer on the simulated box cover 48 can measure the internal temperature in real time. When the specified temperature is reached, the required temperature environment is simulated, and then the tensile stiffness test of the control arm can be carried out;

[0065] After the test is completed, first open the two simulated box covers 48. Then, start the second cylinder 59 to move the second air duct 55 away from above the second lifting lead screw 14. Then, start the second servo motor forward to take out the clamping mechanism on the support cross table 18 from below the U-shaped frame 8. At the same time, the clamping mechanism on the second lifting lead screw 14 moves to below the U-shaped frame 8. After that, continue to close the two simulated box covers 48 for the test work. On the other side, since the control arm is at a high temperature at this time and it is difficult to manually remove it, the air cooler 50 can be started and the corresponding first valve is opened. The cold air will be sprayed onto the control arm through the first air outlet 54 for rapid cooling. After cooling, it is taken out and the next batch of control arms to be tested is replaced;

[0066] Similarly, when the control arm on the other clamping mechanism is tested, the second servo motor is started in reverse to replace the two clamping mechanisms again. Then, the output shaft of the second cylinder 59 is extended to make the second air outlet 56 located above the control arm that has undergone the simulation test. Then, open the second valve to spray the cold air onto the control arm for rapid cooling. Repeat this process until all the tests are completed.

[0067] The present invention also provides a method for testing the stiffness of an automotive control arm, including the following steps:

[0068] S1. Place the control arms: Rotate the corresponding forward and reverse lead screws 27 to make the two corresponding movable arms 28 move relative to each other, so as to adjust the distance between the two gear plates 29. After adjustment, adjust the other gear plates 29 in the same way, and then take out multiple control arms and place them in the multiple concave seats 23 in the two clamping mechanisms respectively. Start the output shafts of the multiple third hydraulic cylinders 24 to extend, and use the second transverse clamping piece 25 to clamp the lower parts of the multiple control arms.

[0069] S2. Conduct tensile test: Start the first servo motor forward, and the linkage arm 5 drives the mounting frame 6 to descend, so that the upper parts of the multiple control arms enter the corresponding U-shaped frames 8. Start the output shafts of the multiple second hydraulic cylinders 9 to extend to clamp the upper parts of the control arms. Start the output shafts of the multiple first hydraulic cylinders 7 to retract. During the retraction process, the control arms are stressed and deformed, and the values during the change process will be displayed by an external computer device.

[0070] S3. Replace the control arms: Start the output shafts of the second hydraulic cylinders 9 to retract to loosen the control arms, start the first servo motor in reverse to bring the U-shaped frames 8 back to the original position, start the second servo motor forward, and the transverse moving plate 17 drives the supporting cross table 18 to move horizontally. At the same time, through the meshing transmission of the two first bevel gears 40, the two second bevel gears 41 and the two third bevel gears 42, the internal thread sleeve 13 rotates, and the second lifting lead screw 14 drives the clamping mechanism thereon to rise. Finally, the position of the clamping mechanism on the second lifting lead screw 14 replaces the position of the clamping mechanism on the original supporting cross table 18. While continuing the tensile test, remove the control arms that have completed the test and replace them with the next batch of control arms to be tested. After the previous batch of control arms have completed the test, start the second servo motor in reverse, and the supporting cross table 18 moves downward below the U-shaped frames 8. At the same time, the second lifting lead screw 14 drives the corresponding clamping mechanism to descend, so that the positions of the two clamping mechanisms are replaced again, and then the stiffness test work is carried out, and so on until all the test work is completed.

[0071] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the description and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A vehicle control arm stiffness test device, comprising a test bench and a supporting side plate fixedly mounted on the top of the test bench, characterized in that: On one side of the supporting side plate, a vertical connecting frame is fixedly installed. A first lifting lead screw is rotatably installed in the vertical connecting frame. A linkage arm is slidably installed on the first lifting lead screw. The linkage arm penetrates through the supporting side plate and is slidably connected to the supporting side plate. On one side of the linkage arm, an installation frame is fixedly installed. On the bottom inner wall of the installation frame, a plurality of first hydraulic cylinders are fixedly installed. The output shafts of the plurality of first hydraulic cylinders all extend below the installation frame and are slidably connected to the bottom of the installation frame. Below the output shafts of the plurality of first hydraulic cylinders, there are U-shaped frames. On both sides of the plurality of U-shaped frames, second hydraulic cylinders are fixedly installed. The output shafts of the plurality of second hydraulic cylinders all extend into the corresponding U-shaped frames and are slidably connected to the corresponding U-shaped frames. On the output shafts of the plurality of second hydraulic cylinders, first transverse clamping pieces are fixedly installed. An internally threaded sleeve is rotatably installed on the test bench. A second lifting lead screw is installed with internal threads in the internally threaded sleeve. On one side of the supporting side plate, a horizontal connecting frame is fixedly installed. A transmission lead screw is rotatably installed in the horizontal connecting frame. A transverse moving plate is installed with threads on the transmission lead screw. On one side of the transverse moving plate, a supporting cross platform is fixedly installed. The supporting cross platform penetrates through the supporting side plate and is slidably connected to the supporting side plate. At the top of the second lifting lead screw and the top of the supporting cross platform, supporting columns are fixedly installed. At the top of the two supporting columns, there are retention mechanisms for clamping and positioning the bottom of the control arm.

2. The vehicle control arm stiffness testing device according to claim 1, characterized in that: Any one of the retention mechanisms includes a load-bearing frame body. A plurality of positioning sockets are opened at the top of the load-bearing frame body. A plurality of positioning plugs are inserted into the plurality of positioning sockets. At the top of the plurality of positioning plugs, concave seats are fixedly installed. On the outer walls on both sides of the plurality of concave seats, third hydraulic cylinders are fixedly installed. The output shafts of the plurality of third hydraulic cylinders all extend into the corresponding concave seats and are slidably connected to the corresponding concave seats. On the output shafts of the plurality of third hydraulic cylinders, second transverse clamping pieces are fixedly installed.

3. The vehicle control arm stiffness testing device according to claim 2, characterized in that: On one side of the plurality of concave seats, through channels are opened. In the plurality of through channels, forward and reverse lead screws are rotatably installed. On the plurality of forward and reverse lead screws, two movable arms are installed with threads. The tops of the plurality of movable arms all extend into the corresponding concave seats and are slidably connected to the top inner wall of the corresponding through channels. On the side where the two corresponding movable arms are close to each other, retaining plates are fixedly installed.

4. The vehicle control arm stiffness testing device according to claim 3, characterized in that: A plurality of arc-shaped through holes are opened on the plurality of positioning plugs. On both sides of the load-bearing frame body, the same rotating shaft is rotatably installed. One end of the rotating shaft extends outside the load-bearing frame body. On the rotating shaft, a plurality of arc-shaped through rods are fixedly installed. The plurality of arc-shaped through rods respectively penetrate through the plurality of arc-shaped through holes and are slidably connected to the inner walls of the corresponding arc-shaped through holes.

5. The vehicle control arm stiffness testing device according to claim 4, characterized in that: A connecting piece is fixedly installed on an outer wall of one side of the load-carrying frame body. An arc-shaped sliding rod is fixedly installed on the connecting piece. A compression spring piece is slidably installed on the arc-shaped sliding rod. The bottom of the compression spring piece is fixedly connected to the rotating shaft. A reset spring is sleeved on the arc-shaped sliding rod. One end of the reset spring is fixedly connected to the connecting piece, and the other end is fixedly connected to the compression spring piece.

6. The vehicle control arm stiffness testing device according to claim 5, characterized in that: Fixed connection blocks are fixedly installed on the output shafts of multiple first hydraulic cylinders. T-shaped sliding grooves are formed in the multiple fixed connection blocks. T-shaped sliding blocks are slidably installed in the multiple T-shaped sliding grooves, and the multiple T-shaped sliding blocks are respectively fixedly connected to the corresponding fixed connection blocks through bolts. The bottoms of the multiple T-shaped sliding blocks are respectively fixedly connected to the multiple U-shaped frames.

7. The vehicle control arm stiffness testing device according to claim 6, characterized in that: A first servo motor is fixedly installed at the top of the vertical connection frame. The output shaft of the first servo motor is fixedly connected to the top end of the first lifting lead screw. A first vertical support plate and a second vertical support plate are fixedly installed at the bottom of the test bench. A first folding plate is fixedly installed on the first vertical support plate. One end of the transmission lead screw penetrates through the first folding plate and is rotatably connected to the first folding plate. Two first stabilizing plates are fixedly installed on one side of the first folding plate close to the support side plate. The same first transmission shaft is rotatably installed on the two first stabilizing plates. Two second stabilizing plates are fixedly installed at the bottom of the test bench. The same second transmission shaft is rotatably installed on the two second stabilizing plates. The second transmission shaft penetrates through the first vertical support plate and is movably connected to the first vertical support plate. The same first bevel gear is fixedly sleeved on the transmission lead screw and the first transmission shaft. The two first bevel gears are meshed with each other. The same second bevel gear is fixedly sleeved on the first transmission shaft and the second transmission shaft. The two second bevel gears are meshed with each other. The same third bevel gear is fixedly sleeved on the second transmission shaft and the internal thread sleeve. The two third bevel gears are meshed with each other. A second servo motor is fixedly installed on one side of the first folding plate. The output shaft of the second servo motor is fixedly connected to one end of the transmission lead screw.

8. The vehicle control arm stiffness testing device according to claim 7, characterized in that: Two cross arms are fixedly installed on the side of the second vertical support plate away from the first vertical support plate, and the same second folding plate is fixedly installed on the side of the two cross arms away from the second vertical support plate. Two steering shafts are rotatably installed on the top of the second folding plate, and stabilizing plates are fixedly installed on the two steering shafts. The two stabilizing plates are fixedly installed on the sides away from each other. Joint plates are fixedly installed on the output shafts of the two first cylinders, and simulation box covers are fixedly installed on one side of the two joint plates. The two simulation box covers are in contact with each other, and one of the clamping mechanisms is located inside the two simulation box covers. A plurality of heating pipes are fixedly installed on the inner walls of the two simulation box covers away from each other. A third servo motor is fixedly installed on the top of the second folding plate, and a first circular gear is fixedly installed on the output shaft of the third servo motor. A second circular gear is fixedly sleeved on one of the steering shafts, and the first circular gear is meshed with the second circular gear. A third circular gear is fixedly sleeved on the two steering shafts, and the two third circular gears are meshed. A thermometer is fixedly installed on one of the simulation box covers.

9. The vehicle control arm stiffness testing device according to claim 8, characterized in that: A cooling fan is fixedly installed on the cross arm located at the top, and an air distribution duct is fixedly installed on the air outlet of the cooling fan, a first air duct is arranged above the horizontal connecting frame, one end of a first connecting pipe is fixedly installed on the air distribution duct, and the other end of the first connecting pipe is fixedly connected to the first air duct, a plurality of first air outlet nozzles are fixedly installed on the bottom of the first air distribution duct, a second air distribution duct is provided below the supporting cross platform, a plurality of second air outlet nozzles are fixedly installed on the bottom of the second air distribution duct, one end of a second connecting pipe is fixedly installed on the air distribution duct, one end of a corrugated pipe is fixedly installed on the other end of the second connecting pipe, and the other end of the corrugated pipe is fixedly connected to the second air distribution duct, a back side standing plate is fixedly installed on the cross arm located at the top, a second cylinder is fixedly installed on the back side standing plate, an output shaft of the second cylinder passes through the back side standing plate and is slidably connected to the back side standing plate, a frame connecting arm is fixedly installed on the output shaft of the second cylinder, one side of the frame connecting arm is fixedly connected to the second air duct, a first valve is provided on the first connecting pipe, and a second valve is provided on the second connecting pipe.

10. A testing method using the vehicle control arm stiffness testing device according to claim 7, characterized in that: The following steps are involved: S1. Placing the control arms: rotating the corresponding forward and reverse screws to make the corresponding two movable arms move relative to each other, so as to adjust the distance between the two shift plates. After the adjustment, the other shift plates are adjusted in the same way. Then, multiple control arms are taken out and respectively placed in multiple concave seats in the two clamping mechanisms. The output shafts of multiple third hydraulic cylinders are started to extend, and the lower end portions of the multiple control arms are clamped by the second transverse clamping piece. S2. Conduct a tensile test: Start the first servo motor in the forward direction, and the linkage arm drives the mounting frame to descend, so that the upper parts of multiple control arms enter the corresponding U-shaped frames. Start the output shafts of multiple second hydraulic cylinders to extend, clamp the upper parts of the control arms, and start the output shafts of multiple first hydraulic cylinders to retract. During the retraction process, the control arms are stressed and the stress changes. The values during the change process will be displayed by an external electronic computer device; S3. Replace the control arms: Start the output shafts of the second hydraulic cylinders to retract to loosen the control arms, start the first servo motor in the reverse direction to bring the U-shaped frames back to their original positions, start the second servo motor in the forward direction, and the transverse movement plate drives the support cross table to move horizontally. At the same time, through the meshing transmission of two first bevel gears, two second bevel gears and two third bevel gears, the internally threaded sleeve rotates, and the second lifting lead screw drives the clamping mechanism thereon to rise. Finally, the position where the clamping mechanism on the second lifting lead screw is located replaces the position where the clamping mechanism on the original support cross table was located. While continuing the tensile test, remove the control arms that have completed the test and replace them with the next batch of control arms to be tested. After the previous batch of control arms have completed the test, start the second servo motor in the reverse direction, and the support cross table moves downward under the U-shaped frames. At the same time, the second lifting lead screw drives the corresponding clamping mechanism to descend, so that the positions of the two clamping mechanisms are replaced again. Then, conduct the stiffness test work, and repeat this process until all the test work is completed.

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