Testing machine

Abstract

The invention relates to the technical field of aviation fastener performance testing equipment, in particular to a testing machine which comprises a rack. The two sliding bodies are connected to the rack in a sliding mode, two clamping blocks are connected to the sliding bodies in a sliding mode, and a clamping cavity is formed between the two clamping blocks; the two rotating frames are rotationally connected to the sliding body, multiple sets of clamping bodies are connected to the rotating frames, each clamping body comprises two clamping blocks, the clamping blocks are slidably connected to the rotating frames in the rotating axial direction of the rotating frames, and the ends, away from the rotating axes of the rotating frames, of the clamping blocks can stretch into the clamping cavities; a clamping cavity matched with a sample in shape is formed between the two clamping blocks; the pull-up driving unit is connected with the rack, and the pull-up driving unit is connected with the sliding bodies and used for changing the distance between the two sliding bodies; the test fixture has the effect of reducing the influence of fixture replacement on the sample performance test efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of aviation fastener performance testing equipment, and particularly relates to a testing machine. Background Art

[0002] Aviation fasteners are an essential part of the aerospace field. Their quality and performance are directly related to the safety and reliability of aircraft. They withstand extreme physical pressures and environmental conditions, and there are extremely high requirements for the quality and safety of fasteners. Therefore, they are usually made of high-strength and highly corrosion-resistant materials such as titanium alloys, aluminum alloys, and superalloys. In order to ensure that the produced fasteners meet the usage requirements, multiple rounds of sampling inspections are required within the same production batch.

[0003] A testing machine is disclosed in the prior art, which includes a workbench, a base, columns, lead screws, an upper crossbeam, and a lower crossbeam. The lead screws include two left and right lead screws. The lower ends of the two left and right lead screws are fixed to the base through nuts, and the upper ends pass through the workbench and are connected to the lower crossbeam through trapezoidal thread pairs. An oil cylinder is provided on the upper part of the base. A piston is installed in the oil cylinder, and the upper end of the piston is connected to the workbench. Hydraulic fixture systems are respectively provided in the upper crossbeam and the lower crossbeam. The hydraulic fixture system includes a jaw clamping plate and jaws. The columns include four columns. The lower ends of the four columns are respectively fixed to the workbench, and the upper ends are respectively fixed to the upper crossbeam. The upper crossbeam and the lower crossbeam are respectively of a semi-open structure. The jaw clamping plate and the jaws are in a dovetail fit. A cover plate is provided between the workbench and the base around the oil cylinder. The cover plate includes an outer cover plate and an inner cover plate. The outer cover plate is fixed to the workbench, and the inner cover plate is fixed to the base.

[0004] In view of the above related technologies, before a tensile test, the hydraulic fixture composed of two jaw clamping plates is driven by the oil cylinder to clamp and fix the sample, and then the distance between the upper and lower hydraulic fixtures is increased to complete the tensile test. However, for different samples, their cross-sections can have various shapes such as rectangular, circular, or oval. At this time, only relying on two jaw clamping plates for clamping will affect the clamping stability of the sample, thereby affecting the accuracy of the sample performance test. And replacing different types of fixtures takes a long time, which will also affect the efficiency of the sample performance test. Summary of the Invention

[0005] In order to reduce the impact of fixture replacement on the efficiency of the sample performance test, the present application provides a testing machine.

[0006] The testing machine provided by the present application adopts the following technical solutions: A testing machine, comprising: A frame; Two sliding bodies, which are slidably connected to the frame, and two clamping blocks are slidably connected to the sliding bodies, and a clamping cavity is formed between the two clamping blocks; Two rotating frames, which are rotatably connected to the sliding bodies, and multiple groups of clamping bodies are connected to the rotating frames. The clamping body includes two clamping blocks, and the clamping blocks are slidably connected to the rotating frames along the rotation axis of the rotating frames. One end of the clamping block away from the rotation axis of the rotating frame can extend into the clamping cavity, and a clamping cavity adapted to the shape of the specimen is formed between the two clamping blocks; A lifting drive unit, which is connected to the frame and is also connected to the sliding bodies, and is used to change the distance between the two sliding bodies.

[0007] By adopting the above technical solution, a clamping body with a corresponding shape is selected according to the shape of the specimen used in the current test, and a force is applied to the rotating frame so that the rotating frame drives the clamping body to rotate until the selected clamping body moves into place. At this time, the target clamping body is located between the two clamping blocks. Then, the specimen is placed in the clamping cavity between the two clamping blocks. By applying a force from the clamping blocks to the clamping blocks, the two clamping blocks are moved closer to each other to clamp and fix the specimen. Then, the distance between the two sliding bodies is adjusted by the lifting drive unit, and then the clamping work of the specimen is repeated until both ends of the specimen are clamped by the clamping blocks, and then the tensile test of the specimen can be started. When replacing specimens with different cross-sectional shapes, only the rotating frame needs to be rotated so that the clamping body with the corresponding shape is switched to the working position. The fixture switching speed is fast. For the designed testing machine, the sliding bodies and the lifting drive unit are conveniently installed through the frame. The sliding bodies can be used as the installation basis for the clamping blocks. Through the two clamping blocks, the clamping blocks can be moved closer to each other and the specimen can be clamped and fixed. Multiple clamping bodies can be installed on the rotating frame at one time as spares for specimens with different cross-sectional shapes, and the fixture can be quickly switched after rotation, reducing the impact of fixture replacement on the test efficiency of specimen performance. The two sliding bodies can be driven to move away from each other by the lifting drive unit, thereby completing the tensile test of the specimen.

[0008] In a specific feasible implementation, an abutting spring is connected to one side of the clamping block away from the other clamping block, and the other end of the abutting spring is connected to the rotating frame to make the two clamping blocks approach each other, and an insertion chamfer is formed at one end of the clamping block away from the rotation axis of the rotating frame.

[0009] By adopting the above technical solution, the designed abutting spring can realize the preliminary clamping of the specimen, that is, the pre-clamping work of the specimen, before the clamping body on the rotating frame rotates to the working position, which can improve the efficiency of specimen performance testing.

[0010] In a specific feasible implementation, an adsorption channel is formed in the clamping block. One end of the adsorption channel communicates with the clamping cavity, and a sealing strip is slidably connected to the clamping block. A limiting spring is connected between one end of the sealing strip and the clamping block. An air passing hole is formed in the sealing strip, and the adsorption channels on both sides of the sealing strip communicate through the air passing hole. An auxiliary air channel is also formed in the clamping block, and the auxiliary air channel communicates with the sliding cavity of the sealing strip. A plurality of gas control units are connected to the sliding body, and the gas control units can be connected to the clamping block to control the air pressure in the adsorption channel and the auxiliary air channel.

[0011] By adopting the above technical solution, first, the specimen is inserted into the clamping cavity between the two clamping blocks. At this time, the abutting spring applies a force to the clamping block, causing the two clamping blocks to initially clamp the specimen. Then, the gas control unit extracts the gas in the adsorption channel and the auxiliary channel. Since one end of the adsorption channel communicates with the clamping cavity, the specimen will be adsorbed on the clamping block. With continuous gas extraction, the gas in the auxiliary air channel is also extracted, and the acting force generated by the air pressure difference overcomes the elastic force of the limiting spring, causing the sealing strip to slide until the air passing hole no longer connects the adsorption channels on both sides. At this time, the adsorption channel in the area between the sealing strip and the specimen is in a sealed low-pressure state, continuously generating an adsorption effect on the specimen. Then, stop extracting the gas and drive the rotating frame to rotate. After the tensile test of the specimen is completed, input gas into the adsorption channel and the auxiliary air channel through the gas control unit, causing the sealing strip to slide until the air passing hole connects the adsorption channels on both sides. At this time, the specimen loses the adsorption force generated by the low pressure in the adsorption channel, and then the residual specimen can be taken out; the designed sealing strip and gas control unit can increase the relative position stability between the specimen and the clamping block through cooperation, reducing the possibility of the specimen shaking when rotating with the rotating frame after pre-clamping.

[0012] In a specific feasible implementation, the gas control unit includes an air pump, which is connected to the sliding body; an air delivery pipe, one end of the air delivery pipe is connected to the air pump, and the other end is connected with a telescopic sealing head. The telescopic sealing head can abut against the clamping block, and the air delivery pipe communicates with the inner cavities of the adsorption channel and the auxiliary air channel through the telescopic sealing head.

[0013] By adopting the above technical solution, the designed gas control unit can realize the air pressure regulation in the adsorption channel and the auxiliary air channel through the cooperation of the air pump, the air delivery pipe and the telescopic sealing head.

[0014] In a specific feasible implementation, the telescopic sealing head includes a telescopic spring, an annular rubber ring is wrapped around the telescopic spring, one end of the annular rubber ring is connected to the gas transmission pipe, and a guiding section with a gradually increasing thickness is formed on the clamping block, and the end of the annular rubber ring away from the gas transmission pipe abuts against the guiding section.

[0015] By adopting the above technical solution, the designed telescopic sealing head can form a telescopic abutting structure through the cooperation of the telescopic spring and the annular rubber ring.

[0016] In a specific feasible implementation, it further includes a sample loading unit, and the sample loading unit includes a loading cylinder, the feeding cylinder is slidably connected to the frame, and the sliding direction of the feeding cylinder is arranged through the rotation axis of the rotating frame, the feeding cylinder is hollow and both ends are open; multiple shaping rods, the shaping rods are slidably connected to the loading cylinder, and one end of the shaping rod extends into the inner cavity of the loading cylinder to form a loading channel; a driving mechanism, the driving mechanism is connected to the loading cylinder, and the driving mechanism is connected to the shaping rod for driving the shaping rod to slide; a fixing mechanism, the fixing mechanism is connected to the loading cylinder, and the fixing mechanism is connected to the shaping rod for making the shaping rod and the loading cylinder relatively stationary; a pushing mechanism, the pushing mechanism is connected to the loading cylinder, and the pushing mechanism is used for pushing the sample to slide in the loading channel.

[0017] By adopting the above technical solution, first arrange multiple samples with the same cross-sectional shape and place them in the inner cavity of the loading cylinder, then drive the shaping rod to move through the driving mechanism until the shaping rod abuts against the sample, and then fix the shaping rod through the fixing mechanism, so that multiple shaping rods form a loading channel with a fixed shape, and then apply force to the sample in the loading channel through the pushing mechanism, so that the sample extends into the clamping cavity by means of the insertion chamfer, and then move the loading cylinder towards the end away from the rotation axis of the rotating frame so that the sample extending into the clamping cavity is completely separated from the loading cylinder; the designed sample loading unit can form a loading channel for the sample to slide through the cooperation of the loading cylinder and multiple shaping rods, the driving mechanism can drive the shaping rod to abut against the sample to form the loading channel, the fixing mechanism can fix the position of the shaping rod, and the pushing mechanism can push out multiple samples in the loading channel one by one.

[0018] In a specific feasible implementation, the driving mechanism includes a limiting cover, the limiting cover is connected to the loading cylinder, and a receiving cavity is formed between the limiting cover and the loading cylinder; The driving airbag is located in the accommodation cavity, and the driving airbag abuts against the limiting cover and the shaping rod; An air pump is connected to the frame, and an air supply hose is connected to the air pump. One end of the air supply hose away from the air pump extends into the accommodation cavity and is connected to the driving airbag.

[0019] By adopting the above technical solution, the designed driving mechanism can drive the shaping rod to abut against the specimen through the cooperation of the limiting cover, the driving airbag, the air pump and the air supply hose.

[0020] In a specific feasible embodiment, the fixing mechanism includes A ring-shaped pressing cylinder. The feeding cylinder is of a double-layer structure and forms a hollow cavity. The ring-shaped pressing cylinder is located in the hollow cavity, and the shaping rod passes through the ring-shaped pressing cylinder and is slidably connected to the ring-shaped pressing cylinder; A plurality of electric telescopic rods are connected to the feeding cylinder, and the piston rods of the electric telescopic rods extend into the hollow cavity and are connected to the ring-shaped pressing cylinder.

[0021] By adopting the above technical solution, the designed fixing mechanism can achieve the relative static state of the shaping rod and the feeding cylinder through the cooperation of the ring-shaped pressing cylinder and the electric telescopic rods.

[0022] In a specific feasible embodiment, the pushing mechanism includes A pushing cylinder is connected to the feeding cylinder, and the axial direction of the piston rod of the pushing cylinder is consistent with the sliding direction of the feeding cylinder; A pushing strip is connected to the piston rod of the pushing cylinder, and the pushing strip can extend into the feeding channel to abut against the specimen.

[0023] By adopting the above technical solution, the designed pushing mechanism can push out the specimens from the feeding channel one by one through the cooperation of the pushing cylinder and the pushing strip.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. The designed testing machine facilitates the installation of the sliding body and the lifting driving unit through the frame. The sliding body can be used as the installation basis for the clamping blocks. The two clamping blocks can make the clamping blocks approach each other and realize the clamping and fixing of the specimen. The rotating frame can install multiple clamping bodies at one time as spares for specimens with different cross-sectional shapes, and can quickly switch the fixtures after rotation, reducing the impact of fixture replacement on the test efficiency of specimen performance. The lifting driving unit can drive the two sliding bodies to move away from each other, thereby completing the tensile test of the specimen.

[0025] 2. The designed testing machine can increase the relative position stability between the specimen and the clamping block through cooperation, and reduce the possibility of the specimen shaking when rotating with the rotating frame after pre-clamping.

[0026] 3. The designed testing machine can form a feeding channel for the specimen to slide through the cooperation of the feeding cylinder and multiple shaping rods. The driving mechanism can drive the shaping rods to abut against the specimen to form the feeding channel. The fixing mechanism can fix the position of the shaping rods, and the pushing mechanism can push out the multiple specimens in the feeding channel one by one. Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of the testing machine in the embodiment of the present application.

[0028] Figure 2 is Figure 1 a partial structural diagram in

[0029] Figure 3 is in Figure 2 the structural schematic diagram after adding a gas control unit on the basis of

[0030] Figure 4 is Figure 3 a sectional view of

[0031] Figure 5 is Figure 4 an enlarged structural schematic diagram of part A in

[0032] Figure 6 is in Figure 1 the overall structural schematic diagram after adding a gas control unit and a specimen feeding unit on the basis of

[0033] Figure 7 is Figure 6 a sectional view of the specimen feeding unit in

[0034] Description of the reference numerals: 1, frame; 2, sliding body; 3, clamping block; 4, rotating frame; 41, clamping block; 411, adsorption channel; 412, auxiliary air duct; 413, limiting spring; 42, abutting spring; 5, lifting drive unit; 6, sealing strip; 61, air passing hole; 7, gas control unit; 71, air delivery pump; 72, air delivery pipe; 73, telescopic sealing head; 731, telescopic spring; 732, annular rubber ring; 8, specimen feeding unit; 81, feeding cylinder; 82, shaping rod; 83, driving mechanism; 831, limiting cover; 832, driving airbag; 833, air pump; 834, air delivery hose; 84, fixing mechanism; 841, annular pressing cylinder; 842, electric telescopic rod; 85, pushing mechanism; 851, pushing cylinder; 852, pushing strip. Detailed Description of the Embodiment

[0035] The following further elaborates on this application in conjunction with the attached Figures 1-7 drawings.

[0036] An embodiment of this application discloses a testing machine.

[0037] Referring to Figure 1 , a testing machine includes a frame 1, a sliding body 2, and a lifting drive unit 5. The number of sliding bodies 2 is two, and both sliding bodies 2 are slidably connected to the frame 1, and the sliding direction of the sliding body 2 is vertically arranged. The lifting drive unit 5 is connected to the frame 1 and is also connected to the sliding body 2 for changing the distance between the two sliding bodies 2. In this application, the lifting drive unit 5 can be a hydraulic cylinder or a pneumatic cylinder, as long as it can drive the sliding body 2 to slide. In this embodiment, the lifting drive unit 5 is preferably a hydraulic cylinder, and a mechanical sensing unit is correspondingly connected to the hydraulic cylinder.

[0038] Referring to Figure 1 , further, two clamping blocks 3 are slidably connected to the sliding body 2. The two clamping blocks 3 slide in the same or opposite directions along the horizontal direction, and a clamping cavity is formed between the two clamping blocks 3. Also, a plurality of clamping cylinders are connected to the sliding body 2, and the clamping blocks 3 are driven by the clamping cylinders to change the size of the clamping cavity.

[0039] Referring to Figure 1 , the testing machine further includes two rotating frames 4. A fixed shaft is welded and fixed to the sliding body 2, and the rotating frame 4 is rotatably connected to the fixed shaft, and the rotation axis of the rotating frame 4 is horizontally arranged. A plurality of clamping bodies are connected to the rotating frame 4. The plurality of clamping bodies can be the same or different, and are determined in advance according to the cross-sectional type of the fastener specimen. In this application, the number of clamping bodies connected to the rotating frame 4 can be two, three, or four. In this embodiment, the number of clamping bodies connected to the rotating frame 4 is four.

[0040] Referring to Figure 2 , specifically, the clamping body includes two clamping blocks 41. The clamping blocks 41 are slidably connected to the rotating frame 4 along the rotation axis of the rotating frame 4, and only relative sliding occurs between the clamping blocks 41 and the rotating frame 4, without relative rotation. One end of the clamping block 41 far from the rotation axis of the rotating frame 4 can extend into the clamping cavity, and a clamping cavity for the specimen to extend into and adapted to the shape of the specimen is formed between the two clamping blocks 41. The fitting side of the clamping block 41 and the clamping block 3 is a plane to achieve fitting and force application between the clamping block 41 and the clamping block 3.

[0041] Referring to Figure 2, Further, in order to achieve the pre-clamping of the specimen and thus improve the efficiency of the performance test of the specimen, a contact spring 42 is welded and fixed to one side of the clamping block 41 away from the other clamping block 41, and the other end of the contact spring 42 is welded to the rotating frame 4, so that the two clamping blocks 41 approach each other, and an insertion chamfer is formed at one end of the clamping block 41 away from the rotation axis of the rotating frame 4, facilitating the insertion of the specimen into the clamping cavity.

[0042] Refer to Figure 3 , Figure 4 and Figure 5 , Further, in order to ensure the position stability of the pre-clamping of the specimen and facilitate the precise docking of the upper and lower clamping cavities, an adsorption channel 411 is provided on the clamping block 41. One end of the adsorption channel 411 communicates with the clamping cavity and corresponds to the clamping area of the specimen. A sealing strip 6 is slidably connected to the clamping block 41. An air passing hole 61 is provided on the sealing strip 6. The adsorption channels 411 at both ends of the sealing strip 6 are communicated via the air passing hole 61. A limiting spring 413 is welded between one end of the sealing strip 6 and the clamping block 41. When the limiting spring 413 is in the natural state, the air passing hole 61 communicates with the adsorption channel 411.

[0043] Refer to Figure 4 and Figure 5 , In order to drive the sealing strip 6 to slide to block the adsorption channel 411, an auxiliary air duct 412 is also provided on the clamping block 41. The auxiliary air duct 412 communicates with the sliding cavity of the sealing strip 6, and the auxiliary air duct 412 is provided at one end close to the limiting spring 413. A plurality of gas control units 7 are connected to the sliding body 2. The gas control unit 7 can be connected to the clamping block 41 to simultaneously control the air pressure in the adsorption channel 411 and the auxiliary air duct 412; it should be noted that in this application, the gas control unit 7 can act on the clamping block 41 on the lower sliding body 2 alone, or can act on the clamping blocks 41 on the upper and lower sliding bodies 2 simultaneously. In this embodiment, the gas control unit 7 acts on the clamping block 41 on the lower sliding body 2 alone.

[0044] Refer to Figure 4 and Figure 5, first insert the specimen into the clamping cavity between the two clamping blocks 41. At this time, the abutting spring 42 applies a force to the clamping blocks 41 so that the two clamping blocks 41 initially clamp the specimen. Then, the gas control unit 7 extracts the gas in the adsorption channel 411 and the auxiliary channel. Since one end of the adsorption channel 411 is connected to the clamping cavity, the specimen will be adsorbed on the clamping block 41. With continuous gas extraction, the gas in the auxiliary air duct 412 is also extracted, and the acting force generated by the pressure difference overcomes the elastic force of the limit spring 413, causing the sealing strip 6 to slide until the air through hole 61 no longer communicates with the adsorption channels 411 on both sides. At this time, the adsorption channel 411 in the area between the sealing strip 6 and the specimen is in a sealed low-pressure state, continuously generating an adsorption effect on the specimen. Then stop extracting the gas and drive the rotating frame 4 to rotate. After the tensile test of the specimen is completed, input gas into the adsorption channel 411 and the auxiliary air duct 412 through the gas control unit 7, causing the sealing strip 6 to slide until the air through hole 61 connects the adsorption channels 411 on both sides. At this time, the specimen loses the adsorption force generated by the low pressure in the adsorption channel 411, and then the residual specimen can be taken out.

[0045] Refer to Figure 3 and Figure 4 , specifically, the gas control unit 7 includes an air delivery pump 71, an air delivery pipe 72, and a telescopic sealing head 73. The air delivery pump 71 is bolted to the sliding body 2. One end of the air delivery pipe 72 is flange-connected to the air delivery pump 71, and the other end is connected to the telescopic sealing head 73. The telescopic sealing head 73 can abut against the clamping block 41, so that a closed cavity is formed among the inner cavity of the air delivery pipe 72, the inner cavity of the telescopic sealing head 73, the adsorption channel 411, and the auxiliary air duct 412.

[0046] Refer to Figure 5 , specifically, the telescopic sealing head 73 includes a telescopic spring 731 and an annular rubber ring 732. The annular rubber ring 732 is coated on the outer side of the telescopic spring 731. One end of the annular rubber ring 732 is flange-connected to the air delivery pipe 72, and the other end is used to abut against the clamping block 41. And in order to facilitate the smooth abutment of the annular rubber ring 732 and the clamping block 41, an introduction section with gradually increasing thickness is formed on the clamping block 41, and the annular rubber ring 732 slides and abuts against the introduction section until it is completely tightened and sealed.

[0047] Refer to Figure 6 and Figure 7, Further, in order to achieve automatic feeding of the specimen, a specimen feeding unit 8 is further included. The specimen feeding unit 8 includes a feeding cylinder 81 and multiple shaping rods 82. The feeding cylinder 81 is slidably connected to the frame 1, and the sliding direction of the feeding cylinder 81 is set to pass through the rotation axis of the rotating frame 4. The feeding cylinder 81 is located below the rotating frame 4. In this application, the feeding cylinder 81 can be driven by a hydraulic cylinder, or by a pneumatic cylinder, or by an electric telescopic cylinder; both ends of the feeding cylinder are open and hollow. The shaping rod 82 is slidably connected to the feeding cylinder 81, and after one end of the shaping rod 82 extends into the inner cavity of the feeding cylinder 81, a feeding channel is formed.

[0048] Referring to Figure 7 , in order to make the cross-sectional shape of the feeding channel match the cross-sectional shape of the specimen, the specimen feeding unit 8 further includes a driving mechanism 83 and a fixing mechanism 84. The driving mechanism 83 is connected to the feeding cylinder 81 and is also connected to the shaping rod 82 for driving the shaping rod 82 to slide; the fixing mechanism 84 is connected to the feeding cylinder 81 and is also connected to the shaping rod 82 for keeping the shaping rod 82 relatively stationary with respect to the feeding cylinder 81.

[0049] Referring to Figure 7 , specifically, the driving mechanism 83 includes a limiting cover 831, a driving airbag 832, an air pump 833, and an air supply hose 834. The limiting cover 831 is fixedly welded to the feeding cylinder 81, and a receiving cavity is formed between the limiting cover 831 and the feeding cylinder 81. The driving airbag 832 is located in the receiving cavity and abuts against the limiting cover 831 and the shaping rod 82. The air pump 833 is connected to the frame 1, and the air pump 833 is flange-connected to the air supply hose 834. The end of the air supply hose 834 away from the air pump 833 extends into the receiving cavity and is flange-connected to the driving airbag 832.

[0050] Referring to Figure 7 , specifically, the fixing mechanism 84 includes an annular pressing cylinder 841 and multiple electric telescopic rods 842. The feeding cylinder 81 is a double-layer structure and forms a hollow cavity. The annular pressing cylinder 841 is coaxially arranged with the feeding cylinder 81 and is located in the hollow cavity of the feeding cylinder 81. The shaping rod 82 passes through the annular pressing cylinder 841 and is slidably connected to the annular pressing cylinder 841. The electric telescopic rod 842 is connected to the feeding cylinder 81, and the piston rod of the electric telescopic rod 842 extends into the hollow cavity and is bolted to the annular pressing cylinder 841. The axial direction of the piston rod of the electric telescopic rod 842 is the same as the axial direction of the feeding cylinder 81.

[0051] Referring to Figure 7, Further, in order to push the specimens out of the feeding channel one by one, the specimen feeding unit 8 further includes a pushing mechanism 85. The pushing mechanism 85 is connected to the feeding cylinder 81, and the pushing mechanism 85 is used to push the specimens to slide in the feeding channel. Specifically, the pushing mechanism 85 includes a pushing cylinder 851 and a pushing bar 852. The pushing cylinder 851 is bolted to the feeding cylinder 81 through a mounting bracket, and the axial direction of the piston rod of the pushing cylinder 851 is consistent with the sliding direction of the feeding cylinder 81. The pushing bar 852 is connected to the piston rod of the pushing cylinder 851, and the pushing bar 852 can extend into the feeding channel and abut against the specimens.

[0052] The implementation principle of a testing machine according to an embodiment of the present application is as follows: Select a clamping body with a corresponding shape according to the shape of the specimen used in the current test, and then insert the specimen into the clamping cavity between the two clamping blocks 41. At this time, the abutting spring 42 applies a force to the clamping blocks 41 so that the two clamping blocks 41 perform preliminary clamping on the specimen.

[0053] Then, the gas control unit 7 is used to extract the gas in the adsorption channel 411 and the auxiliary channel. Since one end of the adsorption channel 411 is communicated with the clamping cavity, the specimen will be adsorbed on the clamping block 41. With the continuous extraction of gas, the gas in the auxiliary air duct 412 is also extracted. The acting force generated by the pressure difference overcomes the elastic force of the limit spring 413, causing the plugging strip 6 to slide until the air through hole 61 no longer communicates with the adsorption channels 411 on both sides. At this time, the adsorption channel 411 in the area between the plugging strip 6 and the specimen is in a sealed low-pressure state, continuously generating an adsorption effect on the specimen. Then, stop extracting the gas and drive the rotating frame 4 to rotate.

[0054] Then, the distance between the two sliding bodies 2 is adjusted by the lifting drive unit 5, and then the clamping work of the specimen is repeated until both ends of the specimen are clamped by the clamping blocks 41, and then the tensile test of the specimen can be started. After the tensile test of the specimen is completed, the gas control unit 7 inputs gas into the adsorption channel 411 and the auxiliary air duct 412, causing the plugging strip 6 to slide until the air through hole 61 communicates the adsorption channels 411 on both sides. At this time, the specimen loses the adsorption force generated by the low pressure in the adsorption channel 411, and then the residual specimen can be taken out.

[0055] When replacing specimens with different cross-sectional shapes, it is only necessary to rotate the rotating frame 4 so that the clamping bodies of the corresponding shapes are switched to the working position, and the fixture switching speed is fast; the sliding body 2 and the stretching drive unit 5 are conveniently installed through the frame 1. The sliding body 2 can be used as the installation base of the clamping block 3. Through the two clamping blocks 3, the clamping blocks 41 can be made to approach each other, and the clamping and fixing of the specimen can be achieved. Multiple clamping bodies can be installed at one time through the rotating frame 4 as spares for specimens with different cross-sectional shapes, and rapid switching of the fixture can be achieved after rotation, reducing the impact of fixture replacement on the test efficiency of specimen performance. The stretching drive unit 5 can drive the two sliding bodies 2 to move away from each other, thereby completing the tensile test of the specimen.

[0056] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A testing machine, characterized in that: include: Rack (1); Two sliding bodies (2), the sliding bodies (2) are slidably connected to the frame (1), and two clamping blocks (3) are slidably connected to the sliding bodies (2), and a clamping cavity is formed between the two clamping blocks (3); Two rotating frames (4), the rotating frames (4) are rotatably connected to the sliding body (2), and the rotating frames (4) are connected to a plurality of groups of clamping bodies, the clamping bodies comprising two clamping blocks (41), the clamping blocks (41) are slidably connected to the rotating frames (4) along the rotating axis of the rotating frames (4), one end of the clamping blocks (41) away from the rotating axis of the rotating frames (4) can extend into the clamping cavity, and a clamping cavity adapted to the shape of the sample is formed between the two clamping blocks (41); A lifting drive unit (5), the lifting drive unit (5) is connected to the frame (1), and the lifting drive unit (5) is connected to the sliding body (2), and is used to change the distance between the two sliding bodies (2).

2. The testing machine according to claim 1, characterized in that: A contact spring (42) is connected to one side of the clamping block (41) away from the other clamping block (41), and the other end of the contact spring (42) is connected to the rotating frame (4) so ​​that the two clamping blocks (41) are close to each other, and an insertion chamfer is formed at one end of the clamping block (41) away from the rotation axis of the rotating frame (4).

3. The testing machine according to claim 2, characterized in that: The clamping block (41) is provided with an adsorption channel (411), one end of which is connected to the clamping cavity, and the clamping block (41) is slidably connected with a sealing strip (6), and a limit spring (413) is connected between one end of the sealing strip (6) and the clamping block (41), and the sealing strip (6) is provided with an air hole (61), and the adsorption channels (411) on both sides of the sealing strip (6) are connected through the air hole (61), and the clamping block (41) is also provided with an auxiliary air channel (412), and the auxiliary air channel (412) is connected to the sliding cavity of the sealing strip (6), and a plurality of gas control units (7) are connected to the sliding body (2), and the gas control unit (7) can be connected to the clamping block (41) to control the air pressure in the adsorption channel (411) and the auxiliary air channel (412).

4. The testing machine according to claim 3, characterized in that: The gas control unit (7) comprises An air delivery pump (71), the air delivery pump (71) being connected to the sliding body (2); An air delivery pipe (72), one end of the air delivery pipe (72) is connected to the air delivery pump (71), and the other end is connected to a telescopic sealing head (73), the telescopic sealing head (73) can abut against the clamping block (41), and the air delivery pipe (72) is connected to the inner cavity of the adsorption channel (411) and the auxiliary air channel (412) through the telescopic sealing head (73).

5. The testing machine according to claim 4, characterized in that: The telescopic sealing head (73) comprises a telescopic spring (731), the telescopic spring (731) is coated with an annular rubber ring (732), one end of the annular rubber ring (732) is connected to the air supply pipe (72), and an introduction section with gradually increasing thickness is formed on the clamping block (41), and one end of the annular rubber ring (732) away from the air supply pipe (72) abuts against the introduction section.

6. The testing machine according to any one of claims 2 to 5, characterized in that: It also includes a sample loading unit (8), the sample loading unit (8) includes A feeding cylinder (81), the feeding cylinder being slidably connected to the frame (1), and the sliding direction of the feeding cylinder being arranged to pass through the rotation axis of the rotating frame (4), the feeding cylinder being hollow and having openings at both ends; A plurality of shaping rods (82), wherein the shaping rods (82) are slidably connected to the loading barrel (81), and one end of the shaping rod (82) extends into the inner cavity of the loading barrel (81) to form a loading channel; A driving mechanism (83), the driving mechanism (83) is connected to the loading cylinder (81), and the driving mechanism (83) is connected to the shaping rod (82), and is used to drive the shaping rod (82) to slide; A fixing mechanism (84), the fixing mechanism (84) being connected to the loading barrel (81), and the fixing mechanism (84) being connected to the shaping rod (82), and being used to make the shaping rod (82) and the loading barrel (81) relatively stationary; A pushing mechanism (85), the pushing mechanism (85) is connected to the loading cylinder (81), and the pushing mechanism (85) is used to push the sample to slide in the loading channel.

7. The testing machine according to claim 6, characterized in that: The driving mechanism (83) comprises A limiting cover (831), wherein the limiting cover (831) is connected to the loading barrel (81), and a receiving chamber is formed between the limiting cover (831) and the loading barrel (81); A driving airbag (832), wherein the driving airbag (832) is located in the accommodating cavity, and the driving airbag (832) abuts against the limiting cover (831) and the shaping rod (82); An air pump (833), the air pump (833) is connected to the frame (1), and an air supply hose (834) is connected to the air pump (833), and one end of the air supply hose (834) away from the air pump (833) extends into the accommodating cavity and is connected to the driving airbag (832).

8. The testing machine according to claim 6, characterized in that: The fixing mechanism (84) comprises An annular pressing cylinder (841), wherein the feeding cylinder (81) is a double-layer structure and forms a hollow cavity, the annular pressing cylinder (841) is located in the hollow cavity, and the shaping rod (82) passes through the annular pressing cylinder (841) and is slidably connected to the annular pressing cylinder (841); A plurality of electric telescopic rods (842), wherein the electric telescopic rods (842) are connected to the loading cylinder (81), and piston rods of the electric telescopic rods (842) extend into the hollow cavity and are connected to the annular pressing cylinder (841).

9. The testing machine according to claim 6, characterized in that: The pushing mechanism (85) comprises A pushing cylinder (851), the pushing cylinder (851) is connected to the loading barrel (81), and the axial direction of the piston rod of the pushing cylinder (851) is consistent with the sliding direction of the loading barrel (81); A pushing bar (852), the pushing bar (852) is connected to the piston rod of the pushing cylinder (851), and the pushing bar (852) can extend into the feeding channel to abut against the sample.

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