Tension detection machine

Abstract

The invention discloses a tensile force detection machine, and relates to the technical field of tensile force detection equipment, the tensile force detection machine comprises two detection tables, a rotating disc and a stretching driving member, the two detection tables are oppositely distributed at an interval, a square tube to be detected is placed between the two detection tables and is not in contact with the detection tables, and the side wall of each detection table is provided with a control unit; the rotating discs are in one-to-one correspondence with the detection tables and are rotationally arranged on the detection tables, the rotating axes of the rotating discs are horizontal and extend in the corresponding directions of the two detection tables, and the two rotating discs are each provided with a clamping assembly on the opposite side wall and used for clamping and fixing the two ends of a square pipe. The axes of the two rotating discs are overlapped with the axis of the square tube; and the stretching driving pieces are in one-to-one correspondence with the rotating discs and are used for driving the corresponding rotating discs to reciprocate in the rotating axis direction. The method has the effect of improving the accuracy of the square tube tension detection result.

Description

Technical Field

[0001] The present application relates to the technical field of tension testing equipment, and in particular to a tension testing machine. Background Art

[0002] Large LPG cylinders typically require a mounting frame welded to the outside of the cylinder for ease of transportation and securement. This frame is constructed from a single square tube welded end-to-end. Perforated angle fittings are welded to each end of the tube to facilitate subsequent lifting. To ensure the stability and strength of the mounting frame, the welded tubes undergo tensile testing to verify the weld strength and ensure the overall stability and strength of the mounting frame.

[0003] Since square tubes are heavy, if they are placed vertically for tensile testing, there is a risk of the tubes toppling over, posing a safety hazard to surrounding workers. Therefore, horizontal testing is safer for square tube tensile testing. A Chinese patent with the related patent publication number CN210108840U discloses a convenient tensile testing device, which includes a fixed platform and a tensile platform. The fixed platform is fixed with a positioning column, and the top surface of the tensile platform is provided with a through slot. The through slot is provided with a vertically upward tensile column. The tensile column is connected to a reciprocating device, which pushes the tensile column to reciprocate within the through slot. During testing, the positioning column and the tensile column are respectively inserted into the through holes of the connecting angle pieces at both ends of the square tube. The tensile column stretches the square tube to perform tensile testing on the square tube.

[0004] When the above-mentioned device is used for tensile testing, since the square tube is heavy, a fixed platform and a tensile platform are used to provide support for the square tube. The contact surface between the square tube and the fixed platform and the tensile platform that provide support is large, and there will be large friction during the tensile testing process, which will affect the tensile testing accuracy of the square tube and make the test results inaccurate. Summary of the Invention

[0005] In order to improve the situation where there is large friction between the square tube and the fixed platform and the tensile platform providing support when performing horizontal tensile testing on the square tube, which affects the accuracy of the tensile testing results, the present application provides a tensile testing machine.

[0006] This application provides a tensile testing machine, which adopts the following technical solutions: A tensile testing machine, comprising There are two testing tables that are spaced apart and relatively distributed. The square tube to be tested is placed between the two testing tables without contacting the testing tables. A control unit is provided on the side wall of the testing table. The rotating disk corresponds to the testing platform one by one and is rotatably arranged on the testing platform. The rotating axis of the rotating disk is horizontal and extends along the direction corresponding to the two testing platforms. The two rotating disks are respectively provided with a set of clamping components on the opposite side walls for clamping and fixing the two ends of the square tube. When installing the square tube, the axes of the two rotating disks are used to coincide with the axis of the square tube; The stretching driving members correspond to the rotating disks one by one and are used to drive the corresponding rotating disks to move back and forth along the direction of the rotation axis.

[0007] Optionally, the clamping assembly includes a limiting column and two fixed columns, the two fixed columns are perpendicular to the side wall of the rotating disk and are symmetrically spaced along the axis of the rotating disk, the limiting column and the fixed column are arranged vertically, and the interval between the two fixed columns is used to place the square tube, the limiting column is simultaneously passed through and fixed in the two fixed columns, and the limiting column is simultaneously passed through the connecting angle piece at the end of the square tube.

[0008] Optionally, at least one set of support components is provided between the two rotating disks, and the support components include one-to-one corresponding lifting blocks and lifting members. The lifting members are electrically connected to the control unit and are used to drive the lifting blocks to move back and forth in the vertical direction. Before the clamping assembly clamps the square tube, the lifting blocks are used to support the square tube.

[0009] Optionally, two support assemblies are provided, and are used to correspond to the welding position distribution of the square tube and the connecting angle piece respectively. Protective plates are movably provided on both sides of the lifting block along the axis of the rotating disk. A trigger assembly is provided on the top surface of the lifting block. During the rotation of the square tube, the protective plate is controlled to pop out by the trigger assembly so that the protective plate surrounds the welding position of the square tube from both sides of the square tube.

[0010] Optionally, the lifting block has an arc-shaped appearance with an opening facing upward, and the top surface of the lifting block is recessed downward to form a placement groove, which is used to place the square tube. The trigger component is set at the lowest position on the top surface of the lifting block. When the square tube rotates, it touches the trigger component through its own edge. The trigger component sends a trigger signal to the control unit, and the control unit controls the protective plate to pop out.

[0011] Optionally, the trigger assembly includes a trigger roller and a contact switch, the contact switch is electrically connected to the control unit, a trigger slot is vertically opened on the top surface of the lifting block corresponding to the position of the trigger assembly, the trigger roller is movably connected in the trigger slot, and the contact switch is triggered when the trigger roller moves downward, and the contact switch sends a signal to the control unit. A vertical elastic member is provided in the trigger slot, and the elastic member is used to push the trigger roller upward and out of the trigger slot.

[0012] Optionally, a tension sensor is provided between the stretching drive member and the rotating disk for real-time monitoring of the tension during stretching of the square tube. The tension sensor is electrically connected to the control unit. When the tension sensor detects that the tension is greater than a preset threshold, a descending signal is sent to the control unit; when the tension sensor detects that the tension is instantaneously reduced to a preset fracture threshold, a lifting signal is sent to the control unit.

[0013] Optionally, after the control unit receives the trigger signal from the contact switch, if the control unit further receives a descending signal from the tension sensor, the control unit sends a descending instruction to the lifting member, and the lifting member drives the lifting block to descend until it is out of contact with the square tube; After receiving the trigger signal from the contact switch, if the control unit receives the lifting signal from the tension sensor, the control unit sends a lifting instruction to the lifting member, and the lifting member drives the lifting block to rise until it contacts the square tube.

[0014] Optionally, the lifting member includes a vertically upward output shaft, the top of the output shaft of the lifting member is fixed to the bottom surface of the lifting block, and a horizontal support plate is also provided at the top of the output shaft of the lifting member. The end of the support plate away from the output shaft of the lifting member is slidingly connected to the side wall of the detection platform, and a buffer assembly is provided at the end of the support plate close to the detection platform. When the square tube to be detected is broken, the buffer assembly is used to provide horizontal buffering force to the rotating disk.

[0015] Optionally, the buffer assembly includes a receiving plate and a buffer member, the receiving plate is placed vertically and is horizontally slidably connected to the top of the support plate, the buffer member is horizontally arranged between the receiving plate and the end of the support plate, one end of the buffer member is connected to the side wall of the receiving plate, and the other end is connected to the support plate. Under normal conditions, a gap is left between the receiving plate and the rotating disk.

[0016] In summary, this application has at least one of the following beneficial effects: 1. A rotating disk that can rotate is provided on the inspection table, and a clamping assembly including a limit column and a fixed column is provided on the opposite side walls of the two rotating disks. When the square tube needs to be installed and fixed, the staff can first place the square tube in the placement slot of the lifting block, and then start the lifting piece, which drives the lifting block to rise vertically. The square tube rises to a height just docking with the clamping assembly and stops. The entire lifting action is completed by the lifting piece and the lifting block, eliminating the staff's operation and reducing the staff's work intensity; then the rotating disk is rotated so that the angle piece at the end of the square tube can be placed just between the two fixed columns, and then the limit column is vertically inserted into the connecting angle piece at the end of the square tube and the two fixed columns at the same time, and finally the fastening bolts can be used The fasteners are used to lock the ends of the limit columns, thereby fixing the connecting angle pieces on the rotating disk. At this time, the square tube can rotate synchronously with the rotating disk. Then, the staff can manually rotate the rotating disk and drive the square tube to rotate 90 degrees, so that the originally vertical limit column rotates to a horizontal state. At this time, the entire weight of the square tube can be supported by the horizontal limit column, and the limit column can apply horizontal tension to the square tube. Even if the lifting block is removed at this time, the square tube can still maintain a horizontal state to be stretched, so that the original support method of the fixed platform and the tension platform directly contacting the bottom of the square tube to provide support is changed to a method of fixing by the limit column, which can completely avoid the influence of the friction generated by the contact on the tension test, making the tension test result of the square tube more accurate. 2. The lifting block can not only actively lift the square tube, which is more labor-saving for the workers, but also has a trigger assembly at the lowest position of the top surface of the lifting block. The trigger assembly includes a trigger roller and a contact switch. Since the cross-section of the square tube along its length is square, and since the lifting block has an arc-shaped appearance with the opening facing upward, when the square tube is placed upright, the bottom surface of the square tube is horizontal. At this time, the square tube will not contact the trigger roller. During the process of the square tube rotating 90 degrees, the edge of the square tube will rotate and gradually move downward. During this process, the edge of the square tube will press the trigger roller down into the trigger groove. When the trigger roller moves downward, it will trigger the contact switch. Then the contact switch sends a trigger signal to the control unit. The control unit controls the protective plate to pop up to both sides of the square tube, so that the protective plate can surround and enclose both sides of the square tube at the welding position. When performing tensile testing, fine chips and iron slag may splash at the welding position of the square tube and the connecting angle piece. The protective plate surrounds the square tube from both sides to prevent fine chips and iron slag from splashing onto the surrounding workers, thereby effectively reducing safety hazards. 3. By arranging a tension sensor between the stretching drive member and the rotating disk, the tension sensor can monitor the stretching force when stretching the square tube in real time. During stretching, when the tension sensor detects that the tension reaches a preset threshold, it sends a descending signal to the control unit. Since the control unit has previously received a trigger signal from the contact switch triggered by the rotation of the square tube, when the control unit receives the descending signal and the previous trigger signal at the same time, the control unit sends an instruction to the lifting member, and the lifting member drives the lifting block to descend, so that the lifting block is out of contact with the square tube. At this time, the square tube is completely supported by the limit column, thereby effectively avoiding the influence of friction on the square tube during stretching; During stretching, when the tension sensor detects that the tension is instantly reduced to the preset fracture threshold, the tension sensor sends a lifting signal to the control unit. At this time, the control unit sends a lifting instruction to the lifting member. The lifting member drives the lifting block to rise until the lifting block supports the square tube and stops. At this time, the lifting block supports the square tube to prevent the square tube from breaking and falling and injuring surrounding staff. When the control unit does not receive the trigger signal of the contact switch, but the tension sensor has detected that the tension has reached the preset threshold, the lifting block does not trigger the descent, but instead issues an alarm to remind the staff that the square tube has not been rotated into place. At this time, the friction force still affects the tension detection of the square tube. 4. The comparative document applies a horizontal tension to the bottom end of the tension column, and then applies a horizontal tension to the top square tube through the tension column, thereby generating a force in the opposite direction at the top end of the tension column. Since there is a gap between the two forces and the tension column is in direct contact with the square tube, a torque will be generated at the contact position between the tension column and the square tube. The greater the tension, the greater the torque generated. When the torque increases to a certain extent, there may be a risk of fracture; while the present application can jointly apply tension to the limit column through two symmetrically distributed fixed columns, and then apply uniform tension to the square tube through the limit column, so that the tension applied to the square tube coincides with the axis of the square tube. Therefore, the square tube will not generate excess torque during the stretching process, thereby reducing the risk of the limit column breaking due to stress concentration caused by excess torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram showing the overall structure of the tensile testing machine in Example 1 of the present application; Figure 2 This is a cross-sectional schematic diagram showing the entire tensile testing machine according to Example 1 of the present application; Figure 3 is a partial cross-sectional schematic diagram showing the clamping assembly of Example 1 of the present application; Figure 4 It is a schematic diagram showing the force analysis of the tension column of the comparative document; Figure 5 This is a schematic structural diagram showing the overall structure of the lifting block in Example 1 of the present application; Figure 6is a cross-sectional schematic diagram showing the trigger assembly of Example 1 of the present application; Figure 7 This is a cross-sectional schematic diagram illustrating the working principle of the protective plate according to Example 1 of the present application; Figure 8 This is a partial cross-sectional schematic diagram showing the buffer component of Example 2 of the present application.

[0018] Explanation of the accompanying drawings: 1. Testing table; 11. Tensile drive member; 111. Tension sensor; 112. Fixed disk; 113. Connecting turntable; 12. Control unit; 13. Moving base; 14. Rotating disk; 2. Workbench; 3. Square tube; 31. Connecting angle member; 4. Clamping assembly; 41. Limiting column; 42. Fixed column; 5. Support assembly; 51. Lifting block; 511. Roller; 512. Trigger slot; 513. Sliding block; 514. Elastic member; 515. Contact switch; 516. Trigger roller; 52. Lifting member; 53. Placement slot; 54. Protective plate; 541. Drive rack; 55. Drive gear; 6. Tension column; 7. Support plate; 71. Abutment plate; 72. Receiver plate; 73. Buffer member. DETAILED DESCRIPTION

[0019] The following is combined with Figure 1-8 This application is described in further detail. Example 1

[0020] Example 1 of the present application discloses a tensile testing machine, referring to Figure 1 The tensile testing machine includes a testing table 1 and a workbench 2. The workbench 2 is a horizontal work platform that can be placed on a flat surface to provide stable and reliable support for the tensile testing machine as a whole. The testing table 1 is fixed to the top surface of the workbench 2. In the embodiment of the present application, the testing tables 1 are provided with two testing tables 1 of the same height, and the two testing tables 1 are spaced apart and arranged relative to each other. The empty space between the two testing tables 1 is used to accommodate the square tube 3, and the ends of the square tube 3 to be tested do not contact the testing table 1.

[0021] The top of the testing platform 1 is connected to a mobile base 13 for horizontal sliding. A slide rail for the mobile base 13 can be fixed to the top of the testing platform 1. The slide rail provides a stable sliding guide for the mobile base 13. The sliding direction of the mobile base 13 is consistent with the extension line of the two testing platforms 1 arranged opposite each other. To facilitate the fixation of the position of the mobile base 13, threaded holes can be opened in the side walls of the mobile base 13, and through holes can be opened in the side walls of the testing platform 1 at corresponding positions. When the mobile base 13 slides to the appropriate position, the staff can pass the tightening bolts through the testing platform 1 and thread them into the mobile base, thereby fixing the position of the mobile base 13.

[0022] A stretching drive 11 is fixed on the top of the movable base 13. In the embodiment of the present application, the stretching drive 11 can be a hydraulic cylinder, which can provide stable and continuous tension for the stretching test of the square tube 3. The stretching drive 11 corresponds to the movable base 13 one by one, and the output shaft of the stretching drive 11 is horizontal and arranged along the direction of the sliding of the movable base 13. Two stretching drives 11 can be provided. In this case, two stretching drives 11 and two movable bases 13 are provided, and tension can be applied from both ends of the square tube 3 to complete the stretching test; only one stretching drive 11 can also be provided. In this case, only one stretching drive 11 applies tension to one end of the square tube 3 to perform unidirectional stretching test, and the position of the other movable base 13 can be relatively fixed. A control unit 12 is fixed on the side wall of the detection platform 1. The control unit 12 is provided with a control circuit board and a control chip. The stretching drive 11 is electrically connected to the control unit 12, so that the control unit 12 can control the output of the stretching drive 11 through a preset control logic.

[0023] Reference Figure 1 and Figure 2 The output shaft of the tensile drive member 11 extends toward the direction in which the square tube 3 is placed inside. A tension sensor 111 is coaxially fixed to the output shaft of the tensile drive member 11 for real-time monitoring of the tension of the square tube 3 during stretching. A connecting shaft is coaxially fixed to the tension sensor 111 on the side away from the tensile drive member 11. A fixed disk 112 is coaxially fixed to the end of the connecting shaft away from the tensile sensor 111. A connecting turntable 113 is coaxially connected to the fixed disk 112. A rotating disk 14 is provided on the side of the fixed disk 112 away from the tensile sensor 111. The rotating disk 14 and the connecting turntable 113 are coaxially fixed via the connecting shaft, allowing them to rotate synchronously. The two side walls of the connecting turntable 113 along the axial direction are tightly abutted against the inner wall of the fixed disk 112, allowing the tensile drive member 11 to drive the connecting turntable 113 to move axially together through the fixed disk 112, and the rotating disk 14 can follow the movement.

[0024] To lock the rotating disk 14 to a fixed angle when needed, a fastening bolt (not shown) is radially penetrated and threadedly connected to the outer wall of the fixed disk 112 along the fixed disk 112. A friction block (not shown) is disposed within the fixed disk 112. The fastening bolt is rotatably connected to the friction block, which is positioned at a corresponding edge of the connecting rotating disk 113. Rotating the fastening bolt causes the fastening bolt to be screwed in or out of the fixed disk 112, thereby driving the friction block to abut or disengage the connecting rotating disk 113, thereby restricting or releasing the rotation of the connecting rotating disk 113. This is similar to the conventional use of automobile brake pads, and can achieve a fixed rotation angle of the connecting rotating disk 113.

[0025] Reference Figure 2 and Figure 3The rotating disks 14 correspond to the inspection platform 1 one by one, and the two rotating disks 14 are coaxially arranged. A set of clamping assemblies 4 are respectively provided on the opposite side walls of the two rotating disks 14, which are used to clamp and fix the two ends of the square tube 3 so that the square tube 3 can rotate synchronously with the rotating disk 14. The clamping assembly 4 includes a limiting column 41 and two fixing columns 42. The two fixing columns 42 are both vertically fixed to the side walls of the rotating disk 14 and are symmetrically spaced along the axis of the rotating disk 14. The fixing columns 42 can be integrally formed with the rotating disk 14, thereby greatly improving the connection stability between the fixing columns 42 and the rotating disk 14.

[0026] The limiting column 41 is simultaneously inserted into the two fixed columns 42, and the length direction of the limiting column 41 is perpendicular to the length direction of the fixed columns 42. When installing the square tube 3, the space between the two fixed columns 42 is used to accommodate the connecting angle piece 31 at the end of the square tube 3. After the connecting angle piece 31 is placed between the two fixed columns 42, the limiting column 41 is simultaneously inserted into the connecting angle piece 31 and the two fixed columns 42. The two ends of the limiting column 41 may be provided with external threads. After the position of the square tube 3 is basically aligned, the locking nuts can be threadedly connected to the two ends of the limiting column 41. The locking nuts are tightened on the limiting column 41, thereby fixing the limiting column 41 on the two fixed columns 42, and then locking the connecting angle piece 31 to the rotating disk 14. At this time, the square tube 3 can rotate synchronously with the rotating disk 14.

[0027] Reference Figure 3 and Figure 4 When the square tube 3 is installed and fixed, the axes of the two rotating disks 14 coincide with the axis of the square tube 3, so that the applied tension coincides with the axis of the square tube 3. In the comparative document, a horizontal tension is applied to the bottom end of the tension column 6 by the hydraulic cylinder, and then a horizontal tension is applied to the top square tube 3 by the tension column 6. Therefore, an oppositely directed force is generated at the top of the tension column 6. Since there is a gap between the two forces and the tension column 6 is in direct contact with the square tube 3, a torque is generated at the position where the tension column 6 contacts the output shaft of the hydraulic cylinder. The greater the tension, the greater the torque generated. When the torque increases to a certain extent, the tension column 6 may be at risk of breaking.

[0028] The tensile testing machine provided in the present application can jointly apply tension to the limit column 41 through two symmetrically distributed fixed columns 42, and then apply uniform tension to the square tube 3 through the limit column 41, so that the tension applied to the square tube 3 coincides with the axis of the square tube 3. Therefore, the square tube 3 will not generate excess torque during the stretching process, thereby reducing the risk of the limit column 41 breaking due to stress concentration caused by the excess torque.

[0029] Further, refer to Figure 3 and Figure 5, in order to facilitate the raising of the height of the square tube 3 so that the square tube 3 can be conveniently docked with the rotating disk 14. At least one set of support assemblies 5 is also provided between the two rotating disks 14. In the embodiment of the present application, two sets of support assemblies 5 are provided, and the two sets of support assemblies 5 are respectively distributed at the welding positions of the square tube 3 and the connecting angle piece 31. Each set of support assemblies 5 includes a one-to-one corresponding lifting block 51 and a lifting member 52. The lifting member 52 can be an electric hydraulic cylinder. The lifting member 52 is electrically connected to the control unit 12 and fixed on the workbench 2. The output shaft of the lifting member 52 is upward and fixed to the bottom of the lifting block 51, which can drive the lifting block 51 to move back and forth in the vertical direction. Before the clamping assembly 4 clamps the square tube 3, the lifting block 51 can support the square tube 3. In other embodiments of the present application, the support assembly 5 can be increased or decreased according to the actual length of the square tube 3 to be tested, so that the support assembly 5 can provide stable support for the square tube 3.

[0030] The lifting block 51 has an overall arc-shaped appearance with an opening facing upward. In the embodiment of the present application, the lifting block 51 has an overall semi-circular arc shape with an opening facing upward, and the top surface of the lifting block 51 is also recessed downward in a semi-circular arc shape, thereby forming a semi-circular arc placement groove 53 with an opening facing upward. The square tube 3 is directly placed in the placement groove 53. The groove walls of the lifting block 51 corresponding to the positions on both sides of the placement groove 53 surround the square tube 3 on both sides, which can effectively prevent the square tube 3 from falling. A laser position sensor (not shown) can be fixed on the inner wall of the inspection table 1. When the lifting block 51 rises to a height suitable for docking with the square tube 3, it will be detected by the laser position sensor. At this time, the lifting member 52 stops driving the lifting block 51 to rise. This is a conventional alignment method and will not be described in detail here.

[0031] When the square tube 3 needs to be installed and fixed, the lifting member 52 first lowers the height of the lifting block 51 to the lowest level. At this time, the staff can first lay the square tube 3 flat and place it in the placement grooves 53 of the two lifting blocks 51 at the same time. Then, the two lifting members 52 drive the corresponding lifting blocks 51 to rise vertically synchronously. The square tube 3 rises to a height just enough to dock with the clamping assembly 4 and stops. The entire lifting action is completed by the lifting member 52 and the lifting blocks 51, eliminating the need for the staff to lift the square tube 3 and reducing the workload. Then, rotate the rotating disk 14 so that the two fixed columns 42 are in an upper and lower position, and then start the stretching drive 11. The stretching drive 11 drives the rotating disk 14 to drive the two fixed columns 42 to move toward the connecting angle piece 31 until the connecting angle piece 31 at the end of the square tube 3 can be just placed between the two fixed columns 42 and stop. Then, vertically insert the limiting column 41 into the connecting angle piece 31 and the two fixed columns 42 at the end of the square tube 3 at the same time, and finally use fasteners such as locking nuts to lock the end of the limiting column 41, so that the connecting angle piece 31 is fixed on the rotating disk 14. Finally, the staff can manually rotate the rotating disk 14 and drive the square tube 3 to rotate 90 degrees, so that the originally vertical limit column 41 rotates to a horizontal state. At this time, the entire weight of the square tube 3 can be supported by the horizontal limit column 41, and the limit column 41 can apply horizontal tension to the square tube 3. Even if the lifting block 51 is removed at this time, the square tube 3 can still maintain a horizontal state to be stretched, so that the original support method of the fixed platform and the tension platform directly contacting the bottom of the square tube 3 is changed to a method of fixing by the limit column 41, which can completely avoid the influence of the friction generated by the contact on the tension detection, so that the tension detection result of the square tube 3 is more accurate.

[0032] Further, refer to Figures 5 to 7 To facilitate the rotation of the square tube 3 within the lifting block 51, multiple rollers 511 are rotatably connected to the inner top wall of the lifting block 51 corresponding to the placement slot 53. The rotation axes of all rollers 511 are parallel to the length of the square tube 3, and all rollers 511 are spaced apart along the semicircular inner top wall of the lifting block 51. The square tube 3 directly contacts the surface of the rollers 511. When the square tube 3 is rotated, the rollers 511 rotate with it, thus facilitating the rotation of the square tube 3.

[0033] A trigger slot 512 is vertically defined at the lowest point of the top wall of the lifting block 51. A sliding block 513 is vertically slidably connected within the trigger slot 512. An elastic member 514, which can be a compression spring, is disposed at the bottom of the sliding block 513. The top of the elastic member 514 is fixed to the bottom of the sliding block 513, while the bottom of the elastic member 514 is fixed to the inner wall of the lifting block 51. A contact switch 515 is fixed to the side wall of the lifting block 51 within the trigger slot 512. The contact switch 515 is electrically connected to the control unit 12. When the sliding block 513 moves up and down within the trigger slot 512, it contacts the contact switch 515, thereby triggering the contact switch 515. At this point, the contact switch 515 sends a trigger signal to the control unit 12. A trigger roller 516 is rotatably connected to the top of the sliding block 513. The rotation axis of the trigger roller 516 is parallel to the rotation axis of the roller 511. In a normal state, the trigger roller 516 is pushed upward out of the trigger slot 512 by the elastic member 514 .

[0034] Furthermore, two protective plates 54 are slidably connected to the interior of the lifting block 51. The two protective plates 54 are stacked up and down, and both protective plates 54 are similar in appearance to the lifting block 51, both having a semicircular arc shape. The two protective plates 54 can extend from the two side walls of the lifting block 51 respectively, and a driving gear 55 is provided between the two protective plates 54. The driving gear 55 is rotatably connected to the interior of the lifting block 51, and the rotation axis is parallel to the trigger roller 516. The rotation axis of the driving gear 55 is located below the lowest position of the top wall of the lifting block 51. A driving motor can be fixed to the position of the outer wall of the lifting block 51 corresponding to the driving gear 55 to drive the driving gear 55 to rotate. The driving motor is also electrically connected to the control unit 12. The upper protective plate 54 has a driving rack 541 at its bottom, and the lower protective plate 54 has a driving rack 541 at its top. The driving racks 541 on the two protective plates 54 are respectively engaged with the driving gear 55 from the upper and lower sides. The rotation of the driving gear 55 can simultaneously drive the two protective plates 54 to extend the lifting blocks 51 outward.

[0035] Since the cross-section of the square tube 3 along its length is square, and since the lifting block 51 has a semicircular arc appearance with the opening facing upward, when the square tube 3 is placed upright, the bottom surface of the square tube 3 is horizontal. At this time, the square tube 3 will not contact the trigger roller 516. During the process of the square tube 3 rotating 90 degrees, the edge of the square tube 3 will rotate and gradually move downward. During this process, the edge of the square tube 3 will press the trigger roller 516 down into the trigger groove 512, and the trigger roller 516 pushes the sliding block 513 to move downward. The sliding block 513 will trigger the contact switch 515, and then the contact switch 515 sends a trigger signal to the control unit 12. Then the control unit 12 sends an instruction to the drive motor to control the drive gear 55 to rotate, so that the protective plate 54 pops out to both sides of the square tube 3, so that the protective plate 54 can surround and enclose both sides of the square tube 3 at the welding position. During the tensile test, fine chips and iron slag may splash from the welding position of the square tube 3 and the connecting angle piece 31. The protective plate 54 surrounds the square tube 3 from both sides to prevent the fine chips and iron slag from splashing onto the surrounding workers, thereby effectively reducing safety hazards.

[0036] A tension sensor 111, located between the tension drive 11 and the rotating disk 14, monitors the tensile force applied to the square tube 3 in real time. Control software can input a preset tension threshold and a fracture threshold into the control unit 12. When the tension sensor 111 detects that the tension exceeds the preset threshold, it sends a descending signal to the control unit 12. When the tension sensor 111 detects that the tension has instantaneously decreased to the preset fracture threshold, it sends an ascending signal to the control unit 12. Simultaneously, the following control logic is programmed into the control unit 12: After receiving a trigger signal from the contact switch 515 and then a descending signal from the tension sensor 111, the control unit 12 sends a descending command to the lifting member 52, causing the lifting block 51 to descend until it breaks contact with the square tube 3. After receiving a trigger signal from the contact switch 515 and then a rise signal from the tension sensor 111, the control unit 12 sends a rise command to the lifting member 52, causing the lifting block 51 to ascend until it contacts the square tube 3.

[0037] When performing a tensile test on the square tube 3, the square tube 3 is first installed and fixed, and then the square tube 3 is rotated 90 degrees. At this time, a trigger signal is sent to the control unit 12 through the trigger switch, and two protective plates 54 pop out to surround and protect the welding position of the square tube 3 and the connecting angle piece 31. Then, the stretching drive member 11 gradually applies tension to the square tube 3. When the tension sensor 111 detects that the tension reaches a preset threshold, it sends a descending signal to the control unit 12. Since the control unit 12 has received the trigger signal before, the control unit 12 sends a descending instruction to the lifting member 52. At this time, the lifting member 52 drives the lifting block 51 to descend, so that the lifting block 51 is out of contact with the square tube 3. At this time, the square tube 3 is completely supported by the limit column 41, thereby effectively avoiding the influence of friction on the square tube 3 during stretching; during stretching, when the tension sensor 111 detects that the tension is instantaneously reduced to a preset fracture threshold, the tension sensor 111 sends a lifting signal to the control unit 12. Since the trigger signal has been received before, the control unit 12 sends a lifting instruction to the lifting member 52. The lifting member 52 drives the lifting block 51 to rise until the lifting block 51 supports the square tube 3 and stops. At this time, the square tube 3 is supported by the lifting block 51 to prevent the square tube 3 from breaking and falling and injuring the surrounding staff.

[0038] If the control unit 12 does not receive a trigger signal from the contact switch 515, but the tension sensor 111 has detected that the tension has reached a preset threshold, the lifting block 51 will not trigger its descent, but instead will sound an alarm to inform the staff that the square tube 3 has not been fully rotated. At this time, friction still affects the tension detection of the square tube 3. If the detection is complete, the square tube 3 is rotated 90 degrees again. At this time, the rotation of the square tube 3 again contacts the contact switch 515 through the trigger roller 516 and the sliding block 513. At this time, the contact switch 515 sends a release signal to the control unit 12, and the drive motor drives the two protective plates 54 to retract into the lifting block 51 via the drive gear 55.

[0039] The implementation principle of a tensile testing machine in Example 1 of the present application is as follows: the lifting member 52 drives the square tube 3 to rise vertically through the lifting block 51 so that the square tube 3 can be docked, reducing the workload of the staff. The square tube 3 is manually driven to rotate 90 degrees, so that the originally vertical limit column 41 is rotated to a horizontal state. At this time, the entire weight of the square tube 3 can be supported by the horizontal limit column 41, and the limit column 41 can apply a horizontal tensile force to the square tube 3, which can avoid the influence of the friction force generated by contact on the tensile test, so that the tensile test result of the square tube 3 is more accurate. The tensile sensor 111 and the contact switch 515 will send corresponding signals to the control unit 12 according to their respective operating conditions. The control unit 12 sends corresponding control instructions to the lifting member 52 and each driving member according to different signals, making the entire tensile test process safer. Example 2

[0040] The difference between Example 2 and Example 1 is that: Figure 2 and Figure 8 The lifting member 52 is fixed with a support plate 7 at the top position of its own output shaft. The support plate 7 is arranged horizontally, and the end of the support plate 7 away from the lifting member 52 extends toward the detection platform 1 and is slidably connected to the side wall of the detection platform 1, so that when the lifting member 52 drives the lifting block 51 to slide vertically up and down, the support plate 7 can provide stable support and guidance for the sliding of the lifting block 51 and the output shaft of the lifting member 52. Even if a heavier square tube 3 is supported on the lifting block 51, the lifting member 51 can still stably lift the square tube 3. For this purpose, a sliding groove for the support plate 7 to slide can be opened on the side wall of the detection platform 1.

[0041] Furthermore, the top surface of the support plate 7 near one end of the test platform 1 is integrally formed with an abutment plate 71. The abutment plate 71 is vertically arranged, and when the square tube 3 is fixed to the rotating disk 14, a gap is left between the top of the abutment plate 71 and the fixed disk 112 to prevent the abutment plate 71 from interfering with other components. A receiving plate 72 is provided on the side of the abutment plate 71 away from the test platform 1. The receiving plate 72 is also vertically arranged and horizontally slidably connected to the top surface of the support plate 7. To this end, the top surface of the support plate 7 is provided with a slide groove for the receiving plate 72 to slide. The top of the receiving plate 72 is inserted and slidably connected to the abutment plate 71 via a slide rod, so that the receiving plate 72 can stably slide back and forth on the top surface of the support plate 7. When the square tube 3 is fixed to the rotating disk 14, a gap is left between the top of the receiving plate 72 and the fixed disk 112, and a gap is also left between the receiving plate 72 and the rotating disk 14.

[0042] A buffer 73 is provided between the receiving plate 72 and the abutting plate 71. The buffer 73 may be a compression spring. The buffer 73 is arranged horizontally, with one end of the buffer 73 fixedly connected to the receiving plate 72 and the other end fixedly connected to the abutting plate 71. If the square tube 3 to be tested is broken during the tensile test, the broken square tube 3 and the components providing the tensile force, such as the rotating disk 14, may be displaced to both sides due to inertia. At this time, the receiving plate 72 can contact and slide with the rotating disk 14, and then the buffer 73 is compressed to absorb the impact force generated by the inertia of each component, providing a horizontal buffer force to each component and reducing the risk of equipment damage. The number of buffers 73 can be increased or decreased according to the actual impact force, so that the buffer 73 can buffer most of the impact force caused by inertia.

[0043] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A tensile testing machine, characterized by: include There are two testing tables that are spaced apart and relatively distributed. The square tube to be tested is placed between the two testing tables without contacting the testing tables. A control unit is provided on the side wall of the testing table. The rotating disks are arranged in a one-to-one correspondence with the test platforms and are rotatably mounted on the test platforms. The rotating axes of the rotating disks are horizontal and extend in the directions corresponding to the two test platforms. The two rotating disks are provided with a set of clamping assemblies on the opposite side walls, respectively, for clamping and fixing the two ends of the square tube. When installing the square tube, the axes of the two rotating disks are used to coincide with the axis of the square tube. The stretching driving members correspond to the rotating disks one by one and are used to drive the corresponding rotating disks to move back and forth along the direction of the rotation axis.

2. The tensile testing machine according to claim 1, characterized in that: The clamping assembly includes a limiting column and two fixed columns. The two fixed columns are perpendicular to the side wall of the rotating disk and are symmetrically spaced along the axis of the rotating disk. The limiting column and the fixed column are arranged vertically. The interval between the two fixed columns is used to place the square tube. The limiting column is simultaneously passed through and fixed in the two fixed columns, and the limiting column is simultaneously passed through the connecting angle piece at the end of the square tube.

3. The tensile testing machine according to claim 2, characterized in that: At least one set of supporting components is also arranged between the two rotating disks. The supporting components include one-to-one corresponding lifting blocks and lifting members. The lifting members are electrically connected to the control unit and are used to drive the lifting blocks to move back and forth in the vertical direction. Before the clamping assembly clamps the square tube, the lifting blocks are used to support the square tube.

4. The tensile testing machine according to claim 3, characterized in that: There are two support assemblies, which are respectively used to correspond to the welding position distribution of the square tube and the connecting angle piece. Protective plates are movably provided on both sides of the lifting block along the axis of the rotating disk. A trigger assembly is provided on the top surface of the lifting block. During the rotation of the square tube, the protective plate is controlled to pop out by the trigger assembly so that the protective plate surrounds the welding position of the square tube from both sides of the square tube.

5. The tensile testing machine according to claim 4, characterized in that: The lifting block has an arc-shaped appearance with an upward opening. The top surface of the lifting block is recessed downward to form a placement groove, which is used to place the square tube. The trigger component is arranged at the lowest position of the top surface of the lifting block. When the square tube rotates, it touches the trigger component through its own edge. The trigger component sends a trigger signal to the control unit, and the control unit controls the protective plate to pop out.

6. The tensile testing machine according to claim 5, characterized in that: The trigger assembly includes a trigger roller and a contact switch, which is electrically connected to the control unit. A trigger groove is vertically opened on the top surface of the lifting block at a position corresponding to the trigger assembly. The trigger roller is movably connected in the trigger groove. When the trigger roller moves downward, the contact switch is triggered, and the contact switch sends a signal to the control unit. A vertical elastic member is provided in the trigger groove, and the elastic member is used to push the trigger roller upward and extend out of the trigger groove.

7. The tensile testing machine according to claim 6, characterized in that: A tension sensor is provided between the stretching drive member and the rotating disk, which is used to monitor the tension during the stretching of the square tube in real time. The tension sensor is electrically connected to the control unit. When the tension sensor detects that the tension is greater than a preset threshold, a descending signal is sent to the control unit; when the tension sensor detects that the tension is instantaneously reduced to a preset fracture threshold, a lifting signal is sent to the control unit.

8. The tensile testing machine according to claim 7, characterized in that: When the control unit receives the trigger signal from the contact switch and then receives the descending signal from the tension sensor, the control unit sends a descending instruction to the lifting member, and the lifting member drives the lifting block to descend until it breaks contact with the square tube; After receiving the trigger signal from the contact switch, if the control unit receives the lifting signal from the tension sensor, the control unit sends a lifting instruction to the lifting member, and the lifting member drives the lifting block to rise until it contacts the square tube.

9. The tensile testing machine according to claim 3, characterized in that: The lifting member includes a vertically upward output shaft, the top of the output shaft of the lifting member is fixed to the bottom surface of the lifting block, and a horizontal support plate is also provided at the top of the output shaft of the lifting member. The end of the support plate away from the output shaft of the lifting member is slidably connected to the side wall of the detection platform, and a buffer assembly is provided at the end of the support plate close to the detection platform. When the square tube to be detected is broken, the buffer assembly is used to provide horizontal buffering force to the rotating disk.

10. The tensile testing machine according to claim 9, characterized in that: The buffer assembly includes a receiving plate and a buffer member. The receiving plate is placed vertically and is horizontally slidably connected to the top of the support plate. The buffer member is horizontally arranged between the receiving plate and the end of the support plate. One end of the buffer member is connected to the side wall of the receiving plate, and the other end is connected to the support plate. Under normal conditions, a gap is left between the receiving plate and the rotating disk.

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