A kind of automatic force test system and test method thereof

Abstract

The present invention relates to an automatic force test system and a test method thereof, comprising: a test device, which applies force to both ends of a test piece; a first clamp; a second clamp, which is movably arranged in parallel on a workbench of the test device; a moving device, which clamps and moves the test piece; a shooting mechanism, which shoots the test piece; a supporting mechanism, which is movably arranged on the second clamp; wherein the second clamp reciprocates and switches positions corresponding to the first clamp; the first clamp and the second clamp respectively limit both ends of the test piece; the shooting end of the shooting mechanism faces the test position of the test piece; when the test piece is tested, the test end of the test device magnetically attracts the first clamp; after the test piece is tested, the supporting mechanism supports the first clamp. The existing solution solves the problem that the daily force condition of the simulated test piece is simulated, the force on the test piece will experience multiple releases, and the test piece will not always be in a tightly clamped state, which is easy to cause slippage between the test piece and the clamp block, resulting in inaccurate test data.

Description

Technical Field

[0001] The invention relates to the field of testing equipment, and in particular to an automatic force testing system and a testing method thereof. Background Art

[0002] The stress test is to test the mechanical properties of the test piece by applying vertical tension or pressure, or horizontal torsion to the test piece. The traditional stress test gradually increases the force value, breaks the test piece, and records the tensile force value. It can only test the extreme performance of the test piece, but cannot simulate the daily stress conditions of the test piece.

[0003] The test device clamps the test piece in a clamping manner, and the clamp block has patterns to increase the friction between the test piece and the test piece. The force test is performed by gradually increasing the force value. The test piece is always in a tightly clamped state, and the test piece and the clamp block will not slip.

[0004] If the daily stress conditions of the test piece are simulated, the stress on the test piece will be released many times, and the test piece will not always be in a tightly clamped state, which can easily cause slippage between the test piece and the clamp, resulting in inaccurate test data.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] In view of the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide an automatic force testing system and a testing method thereof, so as to solve the problem of daily force conditions of simulated test pieces in the prior art. The test piece will experience multiple releases when subjected to force, and the test piece will not always be in a tightly clamped state, which may easily cause slippage between the test piece and the clamp, resulting in inaccurate test data.

[0007] To achieve the above object, the technical solution of the present invention is as follows:

[0008] An automatic stress test system;

[0009] The invention comprises: a test device, which acts on both ends of the test piece; a first clamp; a second clamp, which is movably arranged in parallel with the working table of the test device; a moving device, which clamps and moves the test piece; a photographing mechanism, which photographs the test piece; and a supporting mechanism, which is movably arranged on the second clamp;

[0010] Among them, the second clamp reciprocates and switches its position corresponding to the first clamp; the first clamp and the second clamp respectively limit the two ends of the test piece; the shooting end of the shooting mechanism is directed to the test position of the test piece; when the test piece is tested, the test end of the test device magnetically attracts the first clamp; after the test piece test is completed, the support mechanism supports the first clamp.

[0011] A further technical solution is that it also includes a material placing rack for placing the test pieces and the stretched test pieces, the material placing rack includes: a rack; a placing piece, which is relatively arranged on the rack; a receiving tray, which is placed in parallel on the rack; a transfer block, which is arranged on the rack;

[0012] Among them, the placement piece forms steps from top to bottom in sequence; the distance of the steps relative to the placement piece corresponds to the length of the test piece; inclined surfaces are relatively formed on the steps, and the inclined surfaces are connected to each other to form an angle; the test piece contacts the inclined surfaces; the receiving tray is provided with receiving positions in parallel; the test piece is placed at the receiving positions after stretching; and the test piece is placed in the transfer block.

[0013] A further technical solution is that the test device comprises: a test device; a turntable, arranged at a test end of the test device; a screw rod, rotatably arranged on a workbench of the test device; a slide table, threadedly connected to the screw rod at intervals; and a magnetic device, arranged on the turntable;

[0014] Wherein, the second fixture is connected to the slide; the slide drives the second fixture to move along the workbench of the test equipment; and the magnetic attraction device magnetically attracts the first fixture.

[0015] A further technical solution is that the photographing mechanism comprises: a photographing bracket; a photographing device, photographing toward the tensile fracture position of the test piece; a baffle, arranged relative to the photographing device;

[0016] Among them, adjacent shooting devices form an angle so that the shooting range of the shooting device covers the periphery of the tensile fracture position of the test piece; the shooting device and the baffle are respectively located on both sides of the test piece; and the shooting device is installed on the shooting bracket.

[0017] A further technical solution is that the moving device comprises: a mechanical arm; a clamping cylinder, which is arranged at the moving end of the mechanical arm; a clamping rod, which is arranged at the clamping end of the clamping cylinder; a clamping position, which is relatively opened between the clamping rods;

[0018] Photographic equipment, used to photograph the test section position of the test piece;

[0019] Wherein, when the clamping cylinder drives the clamping rods to approach each other, the test piece is placed in the clamping position; and the photographing device is arranged on the clamping rods.

[0020] A further technical solution is that the support mechanism includes: a second power device; a gear, rotatably arranged on the second fixture; a rack, movably arranged on the second fixture; a support rod, arranged on the rack; a sleeve, arranged on the first fixture;

[0021] Wherein, the second power device drives the gear to rotate; the gear meshes with the rack; when the rack drives the support rods to approach each other, the support rods are placed in the sleeve; when the rack drives the support rods to move away from each other, the support rods are separated from the sleeve.

[0022] A further technical solution is that the first clamp comprises a first clamp body, a first outer cylinder disposed in the first clamp body, a first expansion member movably disposed in the first outer cylinder, and a first pushing device disposed on the first clamp body; wherein the first pushing device pushes the first outer cylinder to cover the upper end of the test piece and pushes the first expansion member close to the upper end of the test piece; the first expansion member expands to contact the end surface of the upper end of the test piece;

[0023] The second clamp includes: a second clamp body, a second outer cylinder arranged in the second clamp body, a second expansion member movably arranged in the second outer cylinder, and a second pushing device arranged on the second clamp body; wherein, the second pushing device pushes the second outer cylinder to cover the lower end of the test piece and pushes the second expansion member close to the lower end of the test piece; the second expansion member expands to contact the end surface of the lower end of the test piece.

[0024] A further technical solution is that clamping blocks are slidably inserted into the first clamping body and the second clamping body respectively; the clamping blocks are fixedly provided with a first semicircular plate and swingably provided with a second semicircular plate respectively; when the clamping blocks buckle the two ends of the test piece, the first semicircular plate and the second semicircular plate clamp the test piece.

[0025] A test method for an automatic force test system comprises the following steps:

[0026] Simulation steps: simulating the stress condition of the test piece to obtain stress data, and obtaining parameters of the test device according to the stress data; storing the parameters corresponding to the test piece;

[0027] Preparation steps: the mobile device clamps the test piece and places the test piece on the transfer block, and the transfer block completes the recognition of the test piece; the mobile device adjusts the position of the test piece on the transfer block;

[0028] Placing step: the moving device clamps the test piece and places the test piece between the first fixture and the second fixture; the upper end of the test piece is placed in the first fixture to complete fixation, and the lower end of the test piece is placed in the second fixture to complete fixation; the test device drives the first fixture and the second fixture to move to the bottom of the test end of the test equipment;

[0029] Test steps: the magnetic attraction device magnetically attracts the first clamp; the support rods move away from each other and disengage from the sleeve, and the support mechanism no longer supports the first clamp;

[0030] According to the corresponding parameters of the test piece, the test device performs corresponding actions on the test piece; the photographing mechanism photographs the test piece, analyzes the photographing data, and obtains the force test data of the test piece;

[0031] The support rods are brought closer to each other, the magnetic attraction device no longer magnetically attracts the first clamp, the support rods are inserted into the sleeve, and the support mechanism supports the first clamp;

[0032] Receiving steps: the test device drives the first clamp and the second clamp to move away from the bottom of the test end of the test equipment; the moving device drives the shooting device to shoot the cross-section of the test piece to obtain the cross-section data of the test piece; the moving device clamps the test piece and moves the test piece out of the first clamp and the second clamp respectively; the moving device puts the test piece into the receiving tray.

[0033] Compared with the prior art, the beneficial technical effects of the present invention are as follows: (1) The test device can complete the stretching, rotation and pressing of the test piece. The stress condition of the test piece can be simulated through the above actions, and the stress data of the test piece obtained is more accurate; at the same time, the second clamp and the first clamp can be switched. When one group of second clamps and one group of first clamps are tested, another group of second clamps and another group of first clamps can load and unload the test piece through the mobile device, thereby improving the test efficiency of the automatic stress test system.

[0034] (2) The first outer cylinder limits the expansion range of the expansion membrane so that the expansion force of the expansion membrane acts on the end face of the test piece. After expansion, the expansion membrane completely contacts the end face of the test piece to avoid local force on the end face of the test piece. The expansion membrane applies a downward force to the test piece and limits the rotation of the test piece.

[0035] The first outer cylinder and the second outer cylinder respectively contact the outer surfaces of the upper and lower ends of the test piece to complete the restriction of the upper and lower ends of the test piece; the first expansion member and the second expansion member contact the end surfaces of the upper and lower ends of the test piece after expansion, and due to the irregularity of the end surface of the test piece, the first expansion member and the second expansion member restrict the axial rotation of the test piece; at the same time, the first expansion member and the second expansion member completely fit the end surface of the test piece, and the first expansion member and the second expansion member can stably press the end surface of the test piece, and then the first outer cylinder and the second outer cylinder are used to complete the restriction of the outer surfaces of the upper and lower ends of the test piece, so that the first clamp and the second clamp can completely clamp and fix the upper and lower ends of the test piece; the present application can prevent the upper and lower ends of the test piece from detaching from the first clamp and the second clamp by maintaining the pressure of the first expansion member and the second expansion member.

[0036] (3) After the first clamp and the second clamp completely restrict and fix the ends of the test piece, the test piece will shake slightly after being subjected to force. The test piece is clamped by the second semicircular plate and the first semicircular plate to suppress the shaking of the test piece and ensure the accuracy of the test; the test piece is clamped by the second semicircular plate and the first semicircular plate to restrict it. When the first pushing device drives the first expansion member and the first outer cylinder to reset and the second pushing device drives the second expansion member and the second outer cylinder to reset, the test piece will not be driven to move and the ends of the test piece will be separated from the first outer cylinder and the second outer cylinder, making it convenient for the moving device to clamp the ends of the test piece.

[0037] (4) The photographing mechanism photographs the middle position of the test piece and records the changes of the test piece when the test piece is subjected to force. Since the automatic force test system simulates the force conditions of the test piece, the simulation test time is long and the changes of the test piece are slow. The photographing mechanism can accurately record the changes of the test piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A left-side structural schematic diagram of an automatic force testing system according to a first embodiment of the present invention is shown.

[0039] Figure 2 A schematic diagram of the main structure of the unloading rack according to the first embodiment of the present invention is shown.

[0040] Figure 3 A three-dimensional structural diagram of a placement piece according to a first embodiment of the present invention is shown.

[0041] Figure 4 A left-side structural schematic diagram of a transfer block in the first embodiment of the present invention is shown.

[0042] Figure 5 A three-dimensional structural diagram showing the position of the clamping cylinder according to the first embodiment of the present invention.

[0043] Figure 6 A schematic diagram of the main structure of the test device, the first clamp, the second clamp and the supporting mechanism of the first embodiment of the present invention is shown.

[0044] Figure 7 A schematic diagram of the front structure of the first clamp, the second clamp and the supporting mechanism of the first embodiment of the present invention is shown.

[0045] Figure 8 A schematic diagram of the front structure of the first clamp of the first embodiment of the present invention is shown.

[0046] Fig. 9 A schematic diagram of the front structure of the second clamp of the first embodiment of the present invention is shown.

[0047] Fig.10The bottom view schematic diagram shows the structure of the first semicircular plate and the second semicircular plate in the closed state of the first embodiment of the present invention.

[0048] Fig.11 The bottom view schematic diagram shows the structure of the first embodiment of the present invention in the open state of the first semicircular plate and the second semicircular plate.

[0049] Fig.12 A schematic diagram of the top structure of the support mechanism according to the first embodiment of the present invention is shown.

[0050] Markings in the accompanying drawings: 1, test device; 11, test equipment; 12, turntable; 13, screw rod; 14, slide; 15, magnetic device; 2, first clamp; 21, first clamp body; 22, first outer tube; 23, first expansion member; 24, first push device; 3, second clamp; 31, second clamp body; 32, second outer tube; 33, second expansion member; 34, second push device; 4, moving device; 41, clamping cylinder; 42, clamping rod; 43, clamping position; 44, mechanical arm; 45, shooting device; 5, shooting mechanism; 51, shooting bracket; 52, shooting device; 5 3. baffle; 6. material discharging rack; 61. frame; 611. infrared sensor; 62. placement piece; 63. step; 64. inclined plane; 65. material receiving tray; 66. material receiving position; 67. transfer block; 671. transfer position; 672. code scanning device; 7. supporting mechanism; 71. gear; 72. rack; 73. support rod; 74. sleeve; 75. second power device; 81. clamping block; 811. groove; 82. first semicircular plate; 83. second semicircular plate; 831. extension; 832. elastic device; 84. window; 85. main body; 86. guide block; 87. expansion membrane. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical scheme and advantages of the present invention clearer, the device proposed by the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings adopt a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated by the accompanying drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0052] First embodiment:

[0053] Figure 1 A left-side structural schematic diagram of an automatic force testing system according to a first embodiment of the present invention is shown. Figure 2 A schematic diagram of the main structure of the unloading rack according to the first embodiment of the present invention is shown. Figure 3 A three-dimensional structural diagram of a placement piece according to a first embodiment of the present invention is shown. Figure 4 A left-side structural schematic diagram of a transfer block in the first embodiment of the present invention is shown. Figure 5 A three-dimensional structural diagram showing the position of the clamping cylinder according to the first embodiment of the present invention. Figure 6 A schematic diagram of the main structure of the test device, the first clamp, the second clamp and the supporting mechanism of the first embodiment of the present invention is shown. Figure 7 The figure shows a schematic diagram of the front view of the first clamp, the second clamp and the supporting mechanism of the first embodiment of the present invention. Figure 1-Figure 7 As shown, the present invention discloses an automatic stress testing system.

[0054] The automatic force testing system includes: a first clamp 2, a test device 1 that applies force to both ends of the test piece, a second clamp 3 that is movably arranged on a workbench of the test device 1 in parallel, a moving device 4 that clamps and moves the test piece, a shooting mechanism 5 that shoots the test piece, and a supporting mechanism 7 that is movably arranged on the second clamp 3.

[0055] Among them, the second clamp 3 reciprocates and switches positions corresponding to the first clamp 2. The first clamp 2 and the second clamp 3 respectively restrict the two ends of the test piece. The shooting end of the shooting mechanism 5 faces the test position of the test piece. When the test piece is tested, the test end of the test device 1 magnetically attracts the first clamp 2. After the test piece test is completed, the support mechanism 7 supports the first clamp 2.

[0056] Exemplarily, there are two groups of second clamps 3. Exemplarily, there are two groups of first clamps 2. When one group of second clamps 3 is located below the test end of the test device 1, the corresponding group of first clamps 2 is magnetically attracted to the test end of the test device 1. When the other group of second clamps 3 is away from the test end of the test device 1, the corresponding other group of first clamps 2 is placed on the support mechanism 7.

[0057] The test device 1 can complete the stretching, rotation and pressing of the test piece. The daily stress condition of the test piece can be simulated by combining, switching and repeating the above actions, and the stress data of the test piece is more accurate. At the same time, the second clamp 3 and the first clamp 2 can be switched. When one set of the second clamp 3 and one set of the first clamp 2 are tested, another set of the second clamp 3 and another set of the first clamp 2 can load and unload the test piece through the moving device 4, which improves the test efficiency of the automatic stress test system.

[0058] The automatic force testing system also includes a discharging rack 6 for placing test pieces and stretched test pieces. The discharging rack 6 includes: a frame 61, a placement piece 62 arranged on the frame 61 in the left and right directions, a receiving tray 65 placed side by side on the frame 61 in the up and down directions, and a transfer block 67 arranged on the frame 61.

[0059] The placement pieces 62 are arranged in the vertical direction. The placement pieces 62 form steps 63 from top to bottom. The distance of the steps 63 on the placement pieces 62 corresponds to the length of the test piece. Therefore, test pieces of different lengths can be placed on the steps 63 on the placement pieces 62.

[0060] The steps 63 are oppositely formed with inclined surfaces 64, which are connected to each other to form an angle. When the test piece is placed on the placement piece 62, the end of the test piece contacts the inclined surface 64 of the step 63. Due to the weight of the test piece, the end of the test piece is located at the angle between the inclined surfaces 64, completing the self-positioning of the test piece. Test pieces of different diameters can be placed on the placement piece 62.

[0061] The placement pieces 62 are arranged opposite to each other, and support both ends of the test piece, so that the moving device 4 can clamp the middle position of the test piece.

[0062] After the test pieces are stretched, they will break, and one group of test pieces will be broken into two groups of test pieces after stretching. The test pieces after stretching cannot be placed on the placement member 62.

[0063] The upper surface of the receiving tray 65 is provided with receiving positions 66 in parallel. The stretched test piece is placed at the receiving position 66.

[0064] Infrared sensors 611 are provided at both ends of the receiving tray 65 on the frame 61. The infrared sensors 611 detect the presence or absence of the receiving tray 65 on the frame 61.

[0065] The test piece is placed in the transfer block 67. A transfer position 671 is provided on the transfer block 67. The test piece is placed in the transfer position 671.

[0066] A code scanning device 672 is installed on the transfer block 67 , and a code scanning end of the code scanning device 672 is located at the lower end of the transfer position 671 .

[0067] The moving device 4 clamps the middle position of the test piece on the placement member 62 to take out the test piece, and when the test piece is placed on the second fixture 3 and the first fixture 2, the end position of the test piece needs to be clamped before it can be placed. By first vertically placing the test piece in the transfer position 671 and then clamping the end position of the test piece, it is convenient to place the test piece on the second fixture 3 and the first fixture 2.

[0068] After the mobile device 4 clamps the test piece, the test piece needs to be identified. Identification codes are formed on the sides of both ends of the test piece. When the test piece is placed in the transfer position 671, the side of the end of the test piece is located at the lower end of the transfer position 671, and the code scanning device 672 completes the code scanning.

[0069] After the test pieces are stretched, the two groups of stretched test pieces also need to be scanned. The stretched test pieces are placed in the transfer position 671, and the scanning is completed by the scanning device 672, and then the stretched test pieces are placed in the receiving position 66.

[0070] The code scanning device 672 scans the test piece and the test piece after the test, and can collect the test piece parameters, making it convenient to record the stress conditions of the test piece.

[0071] The test device 1 includes: a test device 11, a turntable 12 arranged at the test end of the test device 11, a screw 13 rotatably arranged on a workbench of the test device 11, a slide 14 threadedly connected to the screw 13 at intervals, and a magnetic attraction device 15 arranged on the turntable 12.

[0072] The second fixture 3 is connected to the slide 14. The slide 14 drives the second fixture 3 to move along the workbench of the test equipment 11. The magnetic attraction device 15 magnetically attracts the first fixture 2.

[0073] Exemplarily, the test equipment 11 is a tension and compression tester. The turntable 12 drives the first fixture 2 to rotate, and the test equipment 11 drives the first fixture 2 to move up and down. The screw rod 13 is arranged on the workbench of the test equipment 11 for rotation in the left and right directions. The screw rod 13 is driven by a motor. Exemplarily, there are two groups of slides 14. The slides 14 are spaced at a fixed distance. The rotation of the screw rod 13 drives the two groups of slides 14 to move and switch positions.

[0074] When it is necessary to test a test piece with a different end face shape, the second fixture 3 is disassembled and the first fixture 2 on the support mechanism 7 is removed, and a new second fixture 3 and first fixture 2 are replaced to complete the replacement of the second fixture 3 and the first fixture 2.

[0075] The test end of the test device 1 is connected to the first fixture 2 by magnetic attraction. After the first fixture 2 is replaced, it can be quickly put into the test, so that the automatic force test system is suitable for test pieces with different end surface structures and has wide applicability.

[0076] Fig.12 FIG. 1 is a schematic diagram showing a top view of the support mechanism of the first embodiment of the present invention. Figure 1-Figure 7 and Fig.12 As shown, the supporting mechanism 7 includes: a second power device 75, a gear 71 rotatably arranged at the lower end of the second clamp 3, a rack 72 movably arranged on the second clamp 3, a supporting rod 73 arranged on the rack 72, and a sleeve 74 arranged at the lower end of the first clamp 2.

[0077] The second power device 75 drives the gear 71 to rotate, and the gear 71 engages the rack 72. When the rack 72 drives the support rods 73 to approach each other, the support rods 73 are placed in the sleeve 74. When the rack 72 drives the support rods 73 to move away from each other, the support rods 73 are separated from the sleeve 74.

[0078] Exemplarily, the support rod 73 is a hydraulic telescopic rod. Exemplarily, the second power device 75 is a motor. The second power device 75 and the gear 71 are driven by a transmission wheel and a transmission belt. The driving end of the second power device 75 and the coaxial position of the gear 71 are both provided with a transmission wheel, the second power device 75 drives the transmission wheel to rotate, and the transmission belt drives the transmission wheel on the gear 71 to rotate synchronously, so that the gear 71 rotates.

[0079] The support rod 73 is vertically arranged on the rack 72. When the rack 72 drives the support rod 73 to approach each other, the upper end of the support rod 73 is placed on the sleeve 74, and the support rod 73 supports the first clamp 2. When a group of second clamps 3 and a group of first clamps 2 are moved to the bottom of the test end of the test equipment 11, the magnetic attraction device 15 approaches and adsorbs the first clamp 2, and the rack 72 drives the support rod 73 to move away from each other, and the test can be started at this time.

[0080] After the test is completed, the rack 72 drives the support rods 73 to approach each other again, the magnetic device 15 stops adsorbing the first clamp 2, the upper end of the support rod 73 is placed on the sleeve 74, and the support rod 73 supports the first clamp 2. After a group of second clamps 3 and a group of first clamps 2 are away from the test end of the test equipment 11, another group of second clamps 3 and another group of first clamps 2 move to the bottom of the test end of the test equipment 11, completing the position switching.

[0081] The moving device 4 includes: a mechanical arm 44, a clamping cylinder 41 arranged at the moving end of the mechanical arm 44, a clamping rod 42 arranged at the clamping end of the clamping cylinder 41, a clamping position 43 relatively opened between the clamping rods 42, and a shooting device 45 for shooting the test section position of the test piece.

[0082] When the clamping cylinder 41 drives the clamping rods 42 to approach each other, the test piece is placed in the clamping position 43. The shooting device 45 is arranged on the clamping rod 42.

[0083] The mechanical arm 44 drives the clamping cylinder 41 to move, and the clamping cylinder 41 drives the clamping rod 42 to clamp or release the test piece. When the clamping rods 42 are close to each other, the test piece is placed in the clamping position 43.

[0084] After the test piece is tested, the robot arm 44 drives the clamping cylinder 41 to move, and the cross-section of the test piece is photographed by the photographing device 45 .

[0085] Figure 8A schematic diagram of the front structure of the first clamp of the first embodiment of the present invention is shown. Fig. 9 FIG. 2 shows a schematic diagram of the front view of the second clamp of the first embodiment of the present invention. Figure 1-Figure 9 and Fig.12 As shown, the first clamp 2 includes a first clamp body 21, a first outer cylinder 22 disposed in the first clamp body 21, a first expansion member 23 movably disposed in the first outer cylinder 22, and a first pushing device 24 disposed on the first clamp body 21. The first pushing device 24 pushes the first outer cylinder 22 to cover the upper end of the test piece and pushes the first expansion member 23 close to the upper end of the test piece. The first expansion member 23 expands and contacts the end surface of the upper end of the test piece.

[0086] The second clamp 3 includes: a second clamp body 31, a second outer cylinder 32 disposed in the second clamp body 31, a second expansion member 33 movably disposed in the second outer cylinder 32, and a second pushing device 34 disposed on the second clamp body 31. The second pushing device 34 pushes the second outer cylinder 32 to cover the lower end of the test piece and pushes the second expansion member 33 close to the lower end of the test piece. The second expansion member 33 expands and contacts the end surface of the lower end of the test piece.

[0087] Windows 84 are provided on the first clamp body 21 and the second clamp body 31 to facilitate the clamping rod 42 to extend therein to place the test piece and to take out the test piece.

[0088] When it is necessary to limit the upper end of the test piece, the first pushing device 24 pushes the first outer cylinder 22 to move downward, the first outer cylinder 22 covers the upper end of the test piece, the first expansion member 23 moves downward along the first outer cylinder 22, the first expansion member 23 approaches the upper end of the test piece, and the first expansion member 23 begins to expand and contact the upper end of the test piece and the inner surface of the first outer cylinder 22.

[0089] The structure of the first expansion member 23 is similar to that of the second expansion member 33 , and both include a main body 85 , a guide block 86 disposed on the main body 85 , and an expansion membrane 87 covering the main body 85 on a side close to the test piece.

[0090] The main body 85 is connected to a hydraulic source, and the hydraulic medium enters between the main body 85 and the expansion membrane 87 through the main body 85. The expansion membrane 87 expands and contacts the end surface of the test piece.

[0091] The side of the main body 85 close to the test piece is a profile of the end face shape of the test piece. The expansion membrane 87 is bent to form a profile of the end face shape of the test piece, covering the side of the main body 85 close to the test piece. When the first expansion member 23 moves along the first outer cylinder 22, it moves along the first outer cylinder 22 through the guide block 86, which improves the accuracy of the movement of the first expansion member 23, so that the shape of the expansion membrane 87 and the shape of the end face of the test piece correspond to each other and are parallel. When the main body 85 is close to the test piece, the distance between the expansion membrane 87 and the end face of the test piece is the same. When the expansion membrane 87 expands, the expansion distance of each position of the expansion membrane 87 is fixed, so as to avoid uneven force on the expansion membrane 87 and damage to the expansion membrane 87.

[0092] The first outer cylinder 22 limits the expansion range of the expansion membrane 87 so that the expansion force of the expansion membrane 87 acts on the end face of the test piece. After expansion, the expansion membrane 87 completely contacts the end face of the test piece to avoid local force on the end face of the test piece. The expansion membrane 87 applies a downward force to the test piece and limits the rotation of the test piece.

[0093] After the test piece is placed on the first fixture 2 and the second fixture 3, the first outer cylinder 22 and the second outer cylinder 32 respectively cover the two ends of the test piece, and the expansion membrane 87 contacts and applies pre-pressure to the end surface of the test piece. At this time, the expansion force of the expansion membrane 87 is small, so that during the process of the test device 1 driving the first fixture 2 and the second fixture 3 to move horizontally and during the process of the test end of the test device 1 magnetically attracting the first fixture 2, the test piece is restricted to avoid position deviation of the test piece and affect the force on the test piece.

[0094] After the expansion force of the expansion membrane 87 on the end surface of the test piece increases, the test piece starts to be tested. Due to the hydraulic pressure and the flexibility of the expansion membrane 87, the test piece can be limited while avoiding damage to both ends of the test piece and affecting the experimental results.

[0095] After the test of the test piece is completed, the expansion force of the expansion membrane 87 on the end surface of the test piece is reduced, and the first clamp 2 and the second clamp 3 still restrict the test piece during movement to prevent the test piece from being offset and affecting the accuracy of the cross-section photography of the test piece.

[0096] Fig.10 The bottom view schematic diagram shows the structure of the first semicircular plate and the second semicircular plate in the closed state of the first embodiment of the present invention. Fig.11 The bottom view of the structure of the first embodiment of the present invention in which the first semicircular plate and the second semicircular plate are in an open state is shown. Figure 1-Figure 12 As shown, a clamp block 81 is slidably inserted on the first clamp body 21 and the second clamp body 31. A first semicircular plate 82 is fixedly arranged on the clamp block 81 and a second semicircular plate 83 is swingably arranged. When the clamp block 81 buckles the two ends of the test piece, the first semicircular plate 82 and the second semicircular plate 83 clamp the test piece.

[0097] A groove 811 is formed around the clamp block 81. When the clamp block 81 is inserted on the first clamp body 21, the first clamp body 21 is inserted into the groove 811. When the clamp block 81 is inserted on the second clamp body 31, the second clamp body 31 is inserted into the groove 811.

[0098] A through hole is formed on the clamping block 81 for placing the test piece. An extension 831 is arranged at the swing position of the second semicircular plate 83, and the extension 831 extends into the through hole. An elastic device 832 is sleeved at the swing position of the second semicircular plate 83. Exemplarily, the elastic device 832 is a spring.

[0099] When the test piece is placed in the through hole, the test piece pushes the extension 831, and the extension 831 drives the second semicircular plate 83 to swing, and the second semicircular plate 83 approaches the first semicircular plate 82, and the second semicircular plate 83 and the first semicircular plate 82 clamp the test piece.

[0100] When the test piece is taken out, the test piece is separated from the through hole, and the elastic device 832 pushes the second semicircular plate 83 to swing in the opposite direction and reset.

[0101] After the first clamp 2 and the second clamp 3 completely restrict and fix the ends of the test piece, the test piece will vibrate slightly after being subjected to force. The second semicircular plate 83 and the first semicircular plate 82 clamp the test piece to suppress the vibration of the test piece and ensure the accuracy of the test.

[0102] During the test of the test piece, the two ends of the test piece will undergo a certain deformation, so that the two ends of the test piece are respectively stuck in the first outer cylinder 22 and the second outer cylinder 32. When the first pushing device 24 drives the first expansion member 23 and the first outer cylinder 22 to reset, the second pushing device 34 drives the second expansion member 33 and the second outer cylinder 32 to reset, which will drive the test piece to move and change the position of the test piece. In addition, the first outer cylinder 22 and the second outer cylinder 32 form a shield on the end of the test piece, which is not conducive to the clamping of the moving device 4.

[0103] The test piece is clamped and restricted by the second semicircular plate 83 and the first semicircular plate 82. When the first pushing device 24 drives the first expansion member 23 and the first outer cylinder 22 to reset, and the second pushing device 34 drives the second expansion member 33 and the second outer cylinder 32 to reset, the test piece will not be driven to move and the end of the test piece will be separated from the first outer cylinder 22 and the second outer cylinder 32, making it convenient for the moving device 4 to clamp the end of the test piece.

[0104] The photographing mechanism 5 includes a photographing bracket 51 , a photographing device 52 for photographing the tensile fracture position of the test piece, and a baffle 53 provided opposite to the photographing device 52 .

[0105] The adjacent photographing devices 52 form an angle so that the photographing range of the photographing device 52 covers the periphery of the tensile fracture position of the test piece. The photographing device 52 and the baffle 53 are respectively located on both sides of the test piece. The photographing device 52 is installed on the photographing bracket 51.

[0106] The photographing mechanism 5 photographs the middle position of the test piece and records the changes of the test piece when the test piece is subjected to force. Since the automatic force test system simulates the force condition of the test piece, the simulation test time is long and the test piece changes slowly, the photographing mechanism 5 can accurately record the changes of the test piece.

[0107] The test method of the automatic force test system includes the following steps:

[0108] Simulation step: simulate the stress condition of the test piece to obtain stress data, and obtain parameters of the test device 1 according to the stress data. Store the parameters corresponding to the test piece.

[0109] In this application, no force is applied to the test piece to test the various properties of the test piece. Instead, the force condition of the test piece is simulated and restored by the test device 1. The force of the test piece is close to the actual situation, and the obtained test data is more realistic.

[0110] Different test pieces have different installation environments and different stress conditions. The corresponding parameters of each test piece are stored in the simulation step. When the test piece is tested, the corresponding parameters can be quickly called up.

[0111] For example, if the working environment of the test piece needs to withstand rapid punching force repeatedly, the test equipment 11 reciprocates to drive the first clamp 2 to press down the test piece in a short period of time, and repeats this multiple times. The downward force value simulates the punching force value that the test piece needs to withstand in the working environment.

[0112] For example, if the working environment of the test piece needs to withstand forward and reverse torsional forces, the turntable 12 reciprocates to drive the first fixture 2 to switch between forward and reverse rotations in sequence, and the torsional force value simulates the torsional force value that the test piece needs to withstand in the working environment.

[0113] For example, if the working environment of the test piece needs to repeatedly withstand rapid tensile force and slow pressure, the test equipment 11 reciprocates to drive the first clamp 2 to stretch the test piece in a short period of time, and then slowly applies downward pressure, and repeats this many times. The tensile force and downward pressure values ​​simulate the tensile force and pressure values ​​that the test piece needs to withstand in the working environment.

[0114] Preparation step: The mobile device 4 clamps the test piece and places the test piece on the transfer block 67 , and the transfer block 67 completes the identification of the test piece. The mobile device 4 adjusts the position of the test piece on the transfer block 67 .

[0115] The moving device 4 clamps the test piece on the placement piece 62 and places it in the transfer block 67. The code scanning device 672 scans the identification code on the test piece. When the test piece needs to be tested, the parameters of the corresponding test piece are retrieved. Scale lines are formed on both the transfer block 67 and the test piece. The moving device 4 rotates the test piece and adjusts the position of the test piece on the transfer block 67. When the camera 45 captures the scale lines on the transfer block 67 and the scale lines on the test piece corresponding to each other, the camera stops adjusting the position of the test piece on the transfer block 67.

[0116] Since the end face shape of the test piece is irregular, in order to ensure that the contour of the main body 85 corresponds to the end face shape of the test piece, the position of the test piece is rotated and adjusted so that when the two ends of the test piece are placed in the first clamp 2 and the second clamp 3 respectively, the end face of the test piece is parallel to the expansion membrane 87, and the distance between the expansion membrane 87 and the end face of the test piece is the same.

[0117] Placement step: The moving device 4 clamps the test piece and places the test piece between the first clamp 2 and the second clamp 3. The upper end of the test piece is placed in the first clamp 2 to complete the fixation, and the lower end of the test piece is placed in the second clamp 3 to complete the fixation.

[0118] The first outer cylinder 22 and the second outer cylinder 32 respectively cover the upper and lower ends of the test piece to limit the outer surfaces of the upper and lower ends of the test piece.

[0119] The first expansion member 23 and the second expansion member 33 are respectively attached to and pressed against the upper and lower end surfaces of the test piece to restrict the upper and lower end surfaces of the test piece.

[0120] Since the test device 1 simulates the test process of the test piece, rather than testing the extreme force of the test piece, during the test, the first clamp 2 and the second clamp 3 will be subjected to force multiple times and release the force to form friction, so that the clamping force of the first clamp 2 and the second clamp 3 on the test piece is weakened.

[0121] The first outer cylinder 22 and the second outer cylinder 32 contact the outer surfaces of the upper and lower ends of the test piece respectively, completing the restriction of the upper and lower ends of the test piece. After the first expansion piece 23 and the second expansion piece 33 expand, they contact the end faces of the upper and lower ends of the test piece respectively. Due to the irregularity of the end faces of the test piece, the first expansion piece 23 and the second expansion piece 33 restrict the axial rotation of the test piece. At the same time, the first expansion piece 23 and the second expansion piece 33 completely fit the end face of the test piece. The first expansion piece 23 and the second expansion piece 33 can stably press the end face of the test piece, and then the restriction of the outer surfaces of the upper and lower ends of the test piece is completed through the first outer cylinder 22 and the second outer cylinder 32, so that the first clamp 2 and the second clamp 3 can completely clamp and fix the upper and lower ends of the test piece.

[0122] The present application can prevent the upper and lower ends of the test piece from being separated from the first clamp 2 and the second clamp 3 by maintaining the pressure of the first expansion member 23 and the second expansion member 33 .

[0123] The test device 1 drives the first fixture 2 and the second fixture 3 to move below the test end of the test device 11. The screw rod 13 rotates to drive the slide 14 to move, and the slide 14 drives the first fixture 2, the second fixture 3 and the support mechanism 7 to move below the test end of the test device 11.

[0124] Test steps: The test end of the test equipment 11 drives the magnetic device 15 to move downward, and the magnetic device 15 magnetically attracts the first fixture 2. The test end of the test equipment 11 drives the magnetic device 15, the first fixture 2 and the sleeve 74 to move upward, the support rod 73 is separated from the sleeve 74, and the support mechanism 7 no longer supports the first fixture 2. The support rods 73 are away from each other to avoid interference with the test.

[0125] By scanning the identification code on the test piece, the corresponding parameters of the test piece can be learned. According to the corresponding parameters of the test piece, the test device 1 performs corresponding actions on the test piece. The shooting mechanism 5 shoots the test piece and records the change process of the test piece. The shooting data is analyzed to obtain the test piece force test data.

[0126] The support rods 73 are close to each other, the test end of the test equipment 11 drives the magnetic device 15 to move downward, the magnetic device 15 no longer magnetically attracts the first fixture 2, the support rods 73 are inserted into the sleeve 74, and the support mechanism 7 supports the first fixture 2. The test piece sections are spaced a certain distance apart.

[0127] Removal steps: The test device 1 drives the first clamp 2 and the second clamp 3 to move away from the bottom of the test end of the test device 11. The screw rod 13 rotates to drive the slide 14 to move, and the slide 14 drives the first clamp 2, the second clamp 3 and the support mechanism 7 to move away from the bottom of the test end of the test device 11.

[0128] The mobile device 4 drives the photographing device 45 to photograph the cross section of the test piece to obtain the cross section data of the test piece. Since the test piece is broken, the mobile device 4 clamps the test piece twice and moves the test piece out of the first clamp 2 and the second clamp 3 respectively. The mobile device 4 puts the test piece into the receiving tray 65.

[0129] The stress deformation of the specimen during its life cycle can be obtained through the stress test data and the specimen cross-section data, and the fracture trend of the specimen can be verified through the specimen cross-section data.

[0130] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0131] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An automatic force testing system, characterized in that: include: The test device (1) applies force to both ends of the test piece; A first clamp (2); A second fixture (3) is movably arranged in parallel with the workbench of the test device (1); A moving device (4) for clamping and moving the test piece; A photographing mechanism (5) for photographing the test piece; A supporting mechanism (7) movably disposed on the second clamp (3); The second clamp (3) reciprocates and switches positions corresponding to the first clamp (2); the first clamp (2) and the second clamp (3) respectively restrict two ends of the test piece; the shooting end of the shooting mechanism (5) faces the test position of the test piece; when the test piece is tested, the test end of the test device (1) magnetically attracts the first clamp (2); after the test piece is tested, the support mechanism (7) supports the first clamp (2); The first clamp (2) comprises a first clamp body (21), a first outer cylinder (22) arranged in the first clamp body (21), a first expansion member (23) movably arranged in the first outer cylinder (22), and a first pushing device (24) arranged on the first clamp body (21); wherein the first pushing device (24) pushes the first outer cylinder (22) to cover the upper end of the test piece and pushes the first expansion member (23) close to the upper end of the test piece; the first expansion member (23) expands to contact the end surface of the upper end of the test piece; The second clamp (3) comprises: a second clamp body (31), a second outer cylinder (32) arranged in the second clamp body (31), a second expansion member (33) movably arranged in the second outer cylinder (32), and a second pushing device (34) arranged on the second clamp body (31); wherein the second pushing device (34) pushes the second outer cylinder (32) to cover the lower end of the test piece and pushes the second expansion member (33) close to the lower end of the test piece; the second expansion member (33) expands to contact the end surface of the lower end of the test piece; The material discharging rack (6) comprises: a material receiving tray (65) and a transfer block (67); the test device (1) comprises: a test device (11) and a magnetic attraction device (15); the moving device (4) comprises: a shooting device (45); and the supporting mechanism (7) comprises: a supporting rod (73) and a sleeve (74).

2. The automatic force testing system according to claim 1, characterized in that: It also includes a material placing rack (6) for placing the test piece and the stretched test piece, and the material placing rack (6) includes: Frame (61); A placement member (62) arranged relatively on the frame (61); The material receiving trays (65) are placed in parallel on the frame (61); A transfer block (67) is arranged on the frame (61); The placement member (62) forms steps (63) from top to bottom in sequence; the distance of the steps (63) on the placement member (62) corresponds to the length of the test piece; inclined surfaces (64) are formed on the steps (63) and the inclined surfaces (64) are connected to each other to form an angle; the test piece contacts the inclined surfaces (64); the receiving tray (65) is provided with receiving positions (66) in parallel; the test piece is placed at the receiving position (66) after being stretched; and the test piece is placed in the transfer block (67).

3. The automatic stress test system according to claim 2, characterized in that: The test device (1) comprises: Test equipment (11); A turntable (12) arranged at a test end of the test device (11); A screw rod (13) rotatably disposed on a workbench of the test device (11); A slide (14) is threadedly connected to the screw rod (13) at intervals; A magnetic attraction device (15) arranged on the rotating disk (12); The second clamp (3) is connected to the slide (14); the slide (14) drives the second clamp (3) to move along the workbench of the test equipment (11); and the magnetic attraction device (15) magnetically attracts the first clamp (2).

4. The automatic stress testing system according to claim 2, characterized in that: The photographing mechanism (5) comprises: Shooting bracket (51); A photographing device (52) is used to photograph the tensile fracture position of the test piece; A baffle (53) disposed relative to the photographing device (52); Wherein, adjacent photographing devices (52) form an angle so that the photographing range of the photographing device (52) covers the periphery of the tensile fracture position of the test piece; the photographing device (52) and the baffle (53) are respectively located on both sides of the test piece; and the photographing device (52) is mounted on the photographing bracket (51).

5. The automatic stress testing system according to claim 2, characterized in that: The mobile device (4) comprises: Robotic Arm (44); A clamping cylinder (41) disposed at the moving end of the mechanical arm (44); A clamping rod (42) arranged at a clamping end of the clamping cylinder (41); A clamping position (43) is relatively arranged between the clamping rods (42); A photographing device (45) for photographing the test section position of the test piece; When the clamping cylinder (41) drives the clamping rods (42) to move closer to each other, the test piece is placed in the clamping position (43); and the photographing device (45) is arranged on the clamping rods (42).

6. The automatic force testing system according to claim 2, characterized in that: The supporting mechanism (7) comprises: Second power unit (75); a gear (71) rotatably mounted on the second fixture (3); a rack (72) movably disposed on the second fixture (3); A support rod (73) disposed on the rack (72); A sleeve (74) is arranged on the first clamp (2); The second power device (75) drives the gear (71) to rotate; the gear (71) meshes with the rack (72); when the rack (72) drives the support rods (73) to move closer to each other, the support rods (73) are placed in the sleeve (74); when the rack (72) drives the support rods (73) to move away from each other, the support rods (73) are separated from the sleeve (74).

7. The automatic force testing system according to claim 1, characterized in that: A clamping block (81) is slidably inserted into the first clamping body (21) and the second clamping body (31), respectively; a first semicircular plate (82) is fixedly arranged on the clamping block (81) and a second semicircular plate (83) is swingably arranged on the clamping block (81); when the clamping block (81) buckles the two ends of the test piece, the first semicircular plate (82) and the second semicircular plate (83) clamp the test piece.

8. A test method of an automatic force test system, using the automatic force test system as claimed in claim 1, characterized in that: The steps include: Simulation step: simulating the stress condition of the test piece to obtain stress data, and obtaining parameters of the test device (1) according to the stress data; and storing the parameters corresponding to the test piece; Preparation steps: the moving device (4) clamps the test piece and places the test piece on the transfer block (67), and the transfer block (67) completes the identification of the test piece; the moving device (4) adjusts the position of the test piece on the transfer block (67); Placing steps: the moving device (4) clamps the test piece and places the test piece between the first clamp (2) and the second clamp (3); the upper end of the test piece is placed in the first clamp (2) to complete fixation, and the lower end of the test piece is placed in the second clamp (3) to complete fixation; the test device (1) drives the first clamp (2) and the second clamp (3) to move to the bottom of the test end of the test equipment (11); Test steps: the magnetic attraction device (15) magnetically attracts the first clamp (2); the support rods (73) move away from each other and disengage from the sleeve (74), and the support mechanism (7) no longer supports the first clamp (2); According to the parameters corresponding to the test piece, the test device (1) performs corresponding actions on the test piece; the photographing mechanism (5) photographs the test piece, analyzes the photographed data, and obtains the force test data of the test piece; The support rods (73) are moved closer to each other, the magnetic attraction device (15) no longer magnetically attracts the first clamp (2), the support rods (73) are inserted into the sleeve (74), and the support mechanism (7) supports the first clamp (2); Receiving steps: the test device (1) drives the first clamp (2) and the second clamp (3) to move away from the bottom of the test end of the test device (11); the moving device (4) drives the shooting device (45) to shoot the cross section of the test piece to obtain the cross section data of the test piece; the moving device (4) clamps the test piece and moves the test piece out of the first clamp (2) and the second clamp (3) respectively; the moving device (4) puts the test piece into the receiving tray (65).

Images