A tension detection machine

Abstract

The application discloses a tension detection machine, and relates to the technical field of tension detection equipment, which comprises a detection table, a rotating disc and a stretching driving part. The detection table is provided with two intervals and is oppositely distributed. The square tube to be detected is placed between the two detection tables and does not contact the detection tables. The side wall of the detection table is provided with a control unit. The rotating disc is one-to-one corresponding to the detection table and is rotationally arranged on the detection table. The rotating shaft of the rotating disc is horizontal and extends along the corresponding direction of the two detection tables. Each of the two rotating discs is provided with a set of clamping assemblies on the opposite side walls for clamping and fixing the two ends of the square tube. When the square tube is installed, the axes of the two rotating discs are used for coinciding with the axis of the square tube. The stretching driving part is one-to-one corresponding to the rotating disc and is used for driving the corresponding rotating disc to reciprocatingly move along the rotating shaft direction. The application 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 detection equipment, in particular to a tension detection machine. BACKGROUND

[0002] In order to facilitate transportation and fixation, a large oil cylinder usually needs to be welded with a mounting frame outside the oil cylinder. The mounting frame is welded by connecting a single square tube end to end. The both ends of the square tube are welded with a connecting corner piece with a hole, which facilitates subsequent hoisting and use. In order to ensure the stability and firmness of the mounting frame, the square tube after welding needs to be tested for tension to test the strength of the square tube welding, so as to ensure the overall stability and firmness of the mounting frame.

[0003] Since the square tube is heavy, if the square tube is placed vertically for detecting tension, there is a risk of falling, which poses a safety hazard to the surrounding workers. Therefore, horizontal detection is safer for square tube tension detection. A related patent with the publication number CN210108840U discloses a convenient tension testing device, which includes a fixed table and a tension table. The fixed table is fixed with a positioning column. The top surface of the tension table is provided with a through slot. The through slot is provided with a vertically upward tension column. The tension column is connected with a reciprocating device. The reciprocating device drives the tension column to make reciprocating motion in the through slot. During testing, the positioning column and the tension column are respectively inserted into the through hole of the connecting corner piece at both ends of the square tube. The square tube is stretched by the tension column, so as to detect the tension of the square tube.

[0004] When the above device is used for tension detection, since the square tube is heavy, the fixed table and the tension table are used to provide support for the square tube. The contact surface between the square tube and the fixed table and the tension table providing support is large. During the tension detection process, there will be a large friction force, which affects the tension detection accuracy of the square tube, so that the test result is not accurate. SUMMARY

[0005] In order to improve the situation that there is a large friction force between the square tube and the fixed table and the tension table providing support during horizontal tension detection of the square tube, which affects the tension detection result accuracy, the present application provides a tension detection machine.

[0006] The present application provides a tension detection machine, which adopts the following technical scheme:

[0007] A tension detection machine, comprising

[0008] Two detection tables are arranged at intervals and oppositely distributed. The square tube to be detected is placed between the two detection tables without contacting the detection tables. The side wall of the detection table is provided with a control unit.

[0009] The rotating disc is arranged on the detection table and rotates along the axis of the rotating disc, and the axis of the rotating disc is horizontal and extends along the direction corresponding to the detection table.

[0010] The stretching driving member corresponds to the rotating disc and drives the corresponding rotating disc to reciprocate along the axis of the rotating disc.

[0011] Optionally, the clamping assembly comprises a limiting column and two fixing columns, the two fixing columns are perpendicular to the side wall of the rotating disc and are symmetrically and spacedly arranged along the axis of the rotating disc, the limiting column is arranged perpendicularly to the fixing columns, the space between the two fixing columns is used for placing the square tube, the limiting column is arranged in and fixed in the two fixing columns, and the limiting column is arranged in the connecting corner piece at the end of the square tube.

[0012] Optionally, at least one set of supporting assembly is arranged between the two rotating discs, the supporting assembly comprises a lifting block and a lifting member corresponding to each other, the lifting member is electrically connected to the control unit and is used to drive the lifting block to reciprocate along the vertical direction, and the lifting block is used to support the square tube before the clamping assembly clamps the square tube.

[0013] Optionally, two supporting assemblies are arranged and are used to correspond to the welding positions of the square tube and the connecting corner piece, the lifting block is movably provided with a protection plate on both sides along the axis of the rotating disc, and the lifting block is provided with a triggering assembly on the top surface, the protection plate is controlled to pop up through the triggering assembly in the process of rotating the square tube, so that the protection plate surrounds the welding position of the square tube from both sides of the square tube.

[0014] Optionally, the lifting block has a circular arc appearance with an opening facing upward, the top surface of the lifting block is concave downward to form a placing groove, the placing groove is used for placing the square tube, and the triggering assembly is arranged at the position with the lowest height of the top surface of the lifting block, the triggering assembly is touched by the edge of the square tube when the square tube rotates, the triggering assembly sends a triggering signal to the control unit, and the control unit controls the protection plate to pop up.

[0015] Optionally, the triggering assembly comprises a triggering roller and a contact switch, the contact switch is electrically connected to the control unit, the top surface of the lifting block is vertically provided with a triggering groove at the position corresponding to the triggering assembly, the triggering roller is movably connected to the triggering groove, the triggering roller moves downward to trigger the contact switch, the contact switch sends a signal to the control unit, and the triggering groove is provided with a vertical elastic member, and the elastic member is used to push the triggering roller to protrude out of the triggering groove.

[0016] Optionally, a tension sensor is arranged between the stretching driving member and the rotating disc, for monitoring the tension of the square tube in real time, the tension sensor is electrically connected with the control unit, when the tension sensor monitors that the tension is greater than a preset threshold, a descending signal is sent to the control unit; when the tension sensor monitors that the tension instantaneously decreases to a preset breaking threshold, a lifting signal is sent to the control unit.

[0017] Optionally, when the control unit receives the triggering signal of the contact switch, if the control unit further receives the descending signal of the tension sensor, the control unit sends a descending instruction to the lifting member, the lifting member drives the lifting block to descend until the lifting block is out of contact with the square tube.

[0018] When the control unit receives the triggering signal of the contact switch, if the control unit further receives the lifting signal of the tension sensor, the control unit sends a lifting instruction to the lifting member, the lifting member drives the lifting block to ascend until the lifting block is in contact with the square tube.

[0019] Optionally, the lifting member comprises an output shaft vertically upward, the top of the output shaft of the lifting member is fixed with the bottom surface of the lifting block, and a horizontal support plate is further arranged at the top end 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 with the side wall of the detection table, and the end of the support plate close to the detection table is provided with a buffer assembly, the buffer assembly is used for providing a horizontal buffer force to the rotating disc when the square tube to be detected is broken.

[0020] Optionally, the buffer assembly comprises a receiving plate and a buffer member, the receiving plate is vertically placed, and the receiving plate is slidably connected with the top of the support plate, the buffer member is horizontally arranged between the end of the receiving plate and the end of the support plate, one end of the buffer member is connected with the side wall of the receiving plate, and the other end of the buffer member is connected with the support plate, and in a normal state, a gap is left between the receiving plate and the rotating disc.

[0021] In summary, the present application has at least one of the following beneficial effects:

[0022] 1. By setting a rotatable rotating disc on the detection table, and setting a clamping assembly including a limiting column and a fixed column on the respective opposite side walls of the two rotating discs, when it is necessary to install a fixed square tube, the worker can first place the square tube in the placement slot of the lifting block, then start the lifting piece to drive the lifting block to vertically rise, the square tube rises to a height that just stops at the interface of the clamping assembly, the whole lifting action is completed by the lifting piece and the lifting block together, which saves the operation of the worker and reduces the working intensity of the worker; then rotate the rotating disc, so that the corner piece at the end of the square tube can be just placed between the two fixed columns, then vertically insert the limiting column into the connecting corner piece at the end of the square tube and the two fixed columns, finally the end of the limiting column can be locked by using fastening bolts and other fastening pieces, so as to fix the connecting corner piece on the rotating disc, at this time the square tube can rotate synchronously with the rotating disc, then the worker can manually rotate the rotating disc and drive the square tube to rotate 90 degrees, so that the originally vertical limiting column is rotated to a horizontal state, at this time the whole weight of the square tube can be supported by the horizontal limiting column, and the limiting column can exert a horizontal pulling force on the square tube, even if the lifting block is removed at this time, the square tube can still maintain a horizontal state for stretching, so that the original way of providing support by directly contacting the bottom of the square tube with the fixed table and the tension table is changed to the way of fixing by the limiting column, which can completely avoid the influence of friction caused by contact on the tension detection, so that the tension detection result of the square tube is more accurate;

[0023] 2. The lifting block not only can actively lift the square tube, but also is more labor-saving for the worker, and a trigger assembly exists 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 direction is square, and since the lifting block has a circular arc appearance with an opening facing upward, when the square tube is placed, the bottom surface of the square tube is horizontal, at this time the square tube will not contact the trigger roller, and in the process of rotating the square tube by 90 degrees, the edges of the square tube will follow the rotation and gradually move downward, in this process, the edges of the square tube will press the trigger roller downward 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 out to both sides of the square tube, so that the protective plate can surround and enclose the two sides of the square tube at the welding position, when the tension is detected, the welding position of the square tube and the connecting corner piece may have flying sparks, the protective plate encloses the square tube from both sides, which can prevent the flying sparks from splashing on the surrounding workers, thereby effectively reducing the safety hazard;

[0024] 3. By setting a tension sensor between the stretching driving member and the rotating disc, the tension sensor can monitor the tension force in real time when the square tube is stretched. When the tension sensor detects that the tension reaches the preset threshold during stretching, it sends a lowering signal to the control unit. Since the control unit has already received the trigger signal from the contact switch triggered by the rotation of the square tube, when the control unit receives the lowering signal and the previous trigger signal at the same time, the control unit sends an instruction to the lifting member, which drives the lifting block to lower, so that the lifting block is out of contact with the square tube, which is completely supported by the limiting column, thereby effectively avoiding the influence of friction on the square tube during stretching. When the tension sensor detects that the tension force instantaneously decreases to the preset breaking threshold during stretching, the tension sensor sends a lifting signal to the control unit, and at this time the control unit sends a lifting instruction to the lifting member, which drives the lifting block to rise until the lifting block stops supporting the square tube, thereby avoiding the situation that the square tube falls and injures the surrounding workers after breaking; When the control unit does not receive the trigger signal of the contact switch, but the tension sensor has detected that the tension reaches the preset threshold, the lifting block does not trigger the lowering, but sends an alarm to prompt the worker that the square tube has not been rotated in place, and at this time the friction still affects the tension detection of the square tube.

[0025] 4. The comparative document applies a horizontal tension to the bottom end of the tension column, and then applies a horizontal tension to the square tube at the top end of the tension column, so that an opposite force is generated at the top end of the tension column. Since there is a distance between the two forces, and the tension column is in direct contact with the square tube, a torque is generated at the position where the tension column and the square tube are in contact. The greater the tension, the greater the torque generated. When the torque increases to a certain extent, there is a risk of breaking. The present application can apply tension to the limiting column through two symmetrically distributed fixed columns, and then apply uniform tension to the square tube through the limiting 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 stretching, thereby reducing the risk of breaking of the limiting column due to stress concentration. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structure schematic diagram of the tension detection machine according to the embodiment 1 of the present application;

[0027] Figure 2 is a cross-sectional schematic diagram of the tension detection machine according to the embodiment 1 of the present application;

[0028] Figure 3 is a partial cross-sectional schematic diagram of the clamping assembly according to the embodiment 1 of the present application;

[0029] Figure 4 is a force analysis schematic diagram of the tension column of the comparative document;

[0030] Figure 5is a structural schematic diagram of the lifting block as a whole according to Embodiment 1 of the present application;

[0031] Figure 6 is a sectional view schematic diagram of the trigger assembly according to Embodiment 1 of the present application;

[0032] Figure 7 is a sectional view schematic diagram of the working principle of the protective plate according to Embodiment 1 of the present application;

[0033] Figure 8 is a partial sectional view schematic diagram of the buffer assembly according to Embodiment 2 of the present application.

[0034] Legend: 1, detection table; 11, tensile driving member; 111, tension sensor; 112, fixed disc; 113, connecting rotary disc; 12, control unit; 13, moving base; 14, rotary disc; 2, workbench; 3, square tube; 31, connecting corner piece; 4, clamping assembly; 41, limiting column; 42, fixed column; 5, supporting assembly; 51, lifting block; 511, roller; 512, trigger groove; 513, sliding block; 514, elastic member; 515, contact switch; 516, trigger roller; 52, lifting member; 53, placing groove; 54, protective plate; 541, driving rack; 55, driving gear; 6, tension column; 7, supporting plate; 71, abutment plate; 72, receiving plate; 73, buffer member. DETAILED DESCRIPTION

[0035] The following will be described in detail in combination with the accompanying Figures 1-8 The present application will be further described in detail. Embodiment 1

[0036] Embodiment 1 of the present application discloses a tension detection machine, referring to Figure 1 The tension detection machine comprises a detection table 1 and a workbench 2, wherein the workbench 2 is a horizontally placed work platform, and the workbench 2 can be placed on a flat ground to provide stable and reliable support for the whole tension detection machine. The detection table 1 is fixed to the top surface of the workbench 2. In the present application, two detection tables 1 with the same height are provided, and the two detection tables 1 are spaced apart and oppositely distributed. The space region left between the two detection tables 1 is used to accommodate the square tube 3, and the two ends of the square tube 3 to be detected are not in contact with the detection table 1.

[0037] The detection table 1 is horizontally and slidably connected with a moving base 13. The top of the detection table 1 can be specially fixed with a sliding rail for the sliding of the moving base 13. The sliding rail can provide stable sliding guide for the moving base 13. The sliding direction of the moving base 13 is consistent with the direction of the extension line of the two detection tables 1 arranged opposite to each other. In order to facilitate the fixing of the position of the moving base 13, threaded holes can be formed in the side walls of the moving base 13, and through holes can be formed in the side walls of the corresponding positions of the detection table 1. When the moving base 13 is slid to the appropriate position, the staff can pass the fastening bolt through the detection table 1 and be threadedly connected with the moving base, so as to fix the position of the moving base 13.

[0038] The top of the moving base 13 is fixed with a stretching driving element 11. In the embodiment of the application, the stretching driving element 11 can be a hydraulic cylinder, which can provide stable and continuous tension for the stretching detection of the square tube 3. The stretching driving element 11 corresponds to the moving base 13 one by one, and the output shaft of the stretching driving element 11 is horizontally arranged along the sliding direction of the moving base 13. The stretching driving element 11 can be provided with two, at this time, the stretching driving element 11 and the moving base 13 are both provided with two, and the tension can be applied to the two ends of the square tube 3 at the same time to complete the stretching detection; the stretching driving element 11 can also be provided with only one, at this time, only one stretching driving element 11 is used to apply tension to one end of the square tube 3 for one-way stretching detection, and the position of the other moving base 13 can be relatively fixed. The side wall of the detection table 1 is fixed with a control unit 12. The control unit 12 is internally provided with a control circuit board and a control chip. The stretching driving element 11 is electrically connected with the control unit 12, so that the control unit 12 can control the output of the stretching driving element 11 through the preset control logic.

[0039] Referring to Figure 1 and Figure 2 , the output shaft of the stretching driving element 11 extends towards the direction in which the square tube 3 is placed inside. The output shaft of the stretching driving element 11 is coaxially fixed with a tension sensor 111 for real-time monitoring of the tension of the square tube 3 during stretching. The tension sensor 111 is coaxially fixed with a connecting shaft away from the side of the stretching driving element 11. The connecting shaft is coaxially fixed with a fixed disc 112 away from the end of the tension sensor 111. The fixed disc 112 is internally and rotatably connected with a connecting turntable 113. The fixed disc 112 is provided with a rotating disc 14 away from the side of the tension sensor 111. The rotating disc 14 and the connecting turntable 113 are coaxially fixed through the connecting shaft, so that the rotating disc 14 and the connecting turntable 113 can synchronously rotate. The side walls of the connecting turntable 113 on both sides of the axial direction are tightly abutted against the inner wall of the fixed disc 112, so that the stretching driving element 11 can drive the connecting turntable 113 to move axially together, at this time, the rotating disc 14 can move together.

[0040] In order to lock the rotating disc 14 to a fixed angle when needed, a fastening bolt (not shown) can be radially threaded through the outer wall of the fixed disc 112 along the fixed disc 112, and a friction block (not shown) is arranged inside the fixed disc 112, the fastening bolt is in rotating connection with the friction block, and the friction block is correspondingly arranged at the edge position of the connecting disc 113. Rotating the fastening bolt can make the fastening bolt screw into or out of the fixed disc 112, thereby driving the friction block to abut or separate from the connecting disc 113, thereby realizing the restriction or release of the rotating action of the connecting disc 113, similar to the conventional use of automobile brake pads, which can realize the fixation of the rotating angle of the connecting disc 113.

[0041] With reference to Figure 2 and Figure 3 The rotating disc 14 corresponds to the detection table 1 one by one, and the two rotating discs 14 are coaxially arranged. The two rotating discs 14 are respectively provided with a set of clamping assemblies 4 on the opposite side walls, for clamping and fixing the two ends of the square tube 3, so that the square tube 3 can rotate synchronously with the rotating disc 14. The clamping assembly 4 includes a limiting column 41 and two fixing columns 42, the two fixing columns 42 are both fixed perpendicularly to the side wall of the rotating disc 14, and the two fixing columns 42 are symmetrically and spaced apart along the axis of the rotating disc 14. The fixing column 42 can be integrally formed with the rotating disc 14, thereby greatly improving the connection stability of the fixing column 42 and the rotating disc 14.

[0042] The limiting column 41 is simultaneously threaded through the two fixing columns 42, and the length direction of the limiting column 41 is perpendicular to the length direction of the fixing column 42. When the square tube 3 is installed, the spacing space between the two fixing columns 42 is used to accommodate the connecting corner piece 31 at the end of the square tube 3, and after the connecting corner piece 31 is placed between the two fixing columns 42, the limiting column 41 is simultaneously threaded through the connecting corner piece 31 and the two fixing columns 42. Both ends of the limiting column 41 can be provided with external threads, and after the position of the square tube 3 is basically aligned, locking nuts can be threaded at both 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 fixing columns 42, and then locking and fixing the connecting corner piece 31 on the rotating disc 14, at this time the square tube 3 can rotate synchronously with the rotating disc 14.

[0043] With reference to Figure 3 and Figure 4, when the square tube 3 is installed and fixed, the axes of the two rotating discs 14 are coincident with the axis of the square tube 3, so that the applied tension is coincident with the axis of the square tube 3. In the prior art, 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 square tube 3 at the top end by the tension column 6, so that a force in the opposite direction is generated at the top end of the tension column 6. Since there is a spacing 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 is in contact with 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.

[0044] The tension detection machine provided in the present application can apply tension to the limiting column 41 through two symmetrically distributed fixing columns 42, and then apply uniform tension to the square tube 3 through the limiting column 41, so that the tension applied to the square tube 3 is coincident 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 limiting column 41 breaking due to stress concentration caused by excess torque.

[0045] Further, referring to Figure 3 and Figure 5 In order to lift the height of the square tube 3, so that the square tube 3 is convenient for docking with the rotating disc 14. At least one set of supporting assembly 5 is further arranged between the two rotating discs 14. In the embodiment of the present application, the supporting assembly 5 is provided with two sets, and the two sets of supporting assembly 5 are respectively distributed at the welding position of the square tube 3 and the connecting corner piece 31. Each set of supporting assembly 5 includes one corresponding lifting block 51 and lifting piece 52. The lifting piece 52 can be an electrically controlled hydraulic cylinder, and the lifting piece 52 is electrically connected with the control unit 12 and fixed on the workbench 2. The output shaft of the lifting piece 52 is upward and fixed with the bottom of the lifting block 51, so as to drive the lifting block 51 to reciprocate along 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 supporting assembly 5 can be increased or decreased according to the actual length of the square tube 3 to be detected, so that the supporting assembly 5 can provide stable support for the square tube 3.

[0046] The lifting block 51 has an overall appearance of a circular arc shape with an opening facing upward. In the embodiment of the present application, the lifting block 51 has an overall appearance of a semicircular arc shape with an opening facing upward, and the top surface of the lifting block 51 is also concave in a semicircular arc shape, thereby forming a semicircular arc-shaped placing groove 53 with an opening facing upward. The square tube 3 is directly placed in the placing groove 53, and the groove walls of the lifting block 51 corresponding to the positions on both sides of the placing 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 side wall of the detection table 1. When the lifting block 51 rises to an appropriate height for docking with the square tube 3, it will be monitored by the laser position sensor. At this time, the lifting piece 52 stops driving the lifting block 51 to rise. This is a conventional alignment method, which will not be described here.

[0047] When it is necessary to install the square tube 3, the lifting piece 52 first lowers the height of the lifting block 51 to the lowest, at this time the worker can first place the square tube 3 flat, and place the square tube 3 in the placing groove 53 of the two lifting blocks 51 at the same time, then the two lifting pieces 52 drive the respective corresponding lifting blocks 51 to rise vertically at the same time, and the square tube 3 rises to the height that just stops abutting the clamping assembly 4. The whole lifting action is completed by the lifting piece 52 and the lifting block 51, which eliminates the operation of the worker lifting the square tube 3 and reduces the working strength of the worker. Then rotate the rotating disc 14 to make the two fixing columns 42 be in one above the other position, then start the stretching driving piece 11, the stretching driving piece 11 drives the rotating disc 14 to drive the two fixing columns 42 to move towards the direction of approaching the connecting corner piece 31, until the connecting corner piece 31 at the end of the square tube 3 can just be stopped between the two fixing columns 42, then vertically insert the limiting column 41 into the connecting corner piece 31 at the end of the square tube 3 and the two fixing columns 42 at the same time, and finally use the locking nut and the like fastening piece to lock the end of the limiting column 41, so as to fix the connecting corner piece 31 on the rotating disc 14. Finally, the worker can manually rotate the rotating disc 14 and drive the square tube 3 to rotate 90 degrees, so that the originally vertical limiting column 41 is rotated to the horizontal state, at this time the whole weight of the square tube 3 can be supported by the horizontal limiting column 41, and the horizontal pulling force can be applied to the square tube 3 by the limiting column 41, even if the lifting block 51 is removed at this time, the square tube 3 can still maintain the horizontal state of the stretching state, so that the original way of directly contacting the square tube 3 by the fixing table and the pulling force table to provide support is changed to the way of fixing by the limiting column 41, which can completely avoid the influence of the friction force generated by the contact on the pulling force detection, so that the pulling force detection result of the square tube 3 is more accurate.

[0048] Further, with reference to Figures 5 to 7 In order to facilitate the rotation of the square tube 3 inside the lifting block 51, the inner top wall of the lifting block 51 corresponding to the placing groove 53 is rotatably connected with a plurality of rollers 511, the rotation axes of all the rollers 511 are parallel to the length direction of the square tube 3, and all the rollers 511 are spaced apart along the semicircular arc-shaped inner top wall of the lifting block 51. The square tube 3 directly contacts the surface of the roller 511, and when the square tube 3 is rotated, the roller 511 can rotate with it, thereby facilitating the rotation of the square tube 3.

[0049] The trigger slot 512 is vertically arranged in the position with the lowest height of the top wall of the lifting block 51, and the sliding block 513 is vertically and slidably connected in the trigger slot 512. The bottom of the sliding block 513 is provided with the elastic element 514, which can be a compression spring. The top end of the elastic element 514 is fixed to the bottom of the sliding block 513, and the bottom end of the elastic element 514 is fixed to the inner wall of the lifting block 51. The contact switch 515 is fixed to the side wall of the lifting block 51 in the trigger slot 512, and the contact switch 515 is electrically connected to the control unit 12. When the sliding block 513 moves up and down in the trigger slot 512, the sliding block 513 can touch the contact switch 515, thereby triggering the contact switch 515. At this time, the contact switch 515 sends a trigger signal to the control unit 12. The trigger roller 516 is rotatably connected to the top of the sliding block 513, and the rotation axis of the trigger roller 516 is parallel to the rotation axis of the roller 511. In the normal state, the trigger roller 516 is pushed out of the trigger slot 512 by the elastic element 514.

[0050] Further, the two protective plates 54 are slidably connected in the lifting block 51. The two protective plates 54 are stacked in an up-down manner and are similar in shape to the lifting block 51, both of which are semicircular in appearance. The two protective plates 54 can respectively extend out of the lifting block 51 from the two side wall positions of the lifting block 51. The driving gear 55 is arranged between the two protective plates 54, and the driving gear 55 is rotatably connected in the lifting block 51. The rotation axis of the driving gear 55 is parallel to the trigger roller 516, and the rotation axis of the driving gear 55 corresponds to the position below the lowest position of the top wall of the lifting block 51. The position corresponding to the driving gear 55 on the outer wall of the lifting block 51 can be fixed with a driving motor for driving the driving gear 55 to rotate. The driving motor is also electrically connected to the control unit 12. The bottom of the upper protective plate 54 is provided with the driving rack 541, and the top of the lower protective plate 54 is provided with the driving rack 541. The driving racks 541 on the two protective plates 54 are engaged with the driving gear 55 from the upper and lower sides, respectively. The rotation of the driving gear 55 can simultaneously drive the two protective plates 54 to extend out of the lifting block 51.

[0051] Since the cross section of the square tube 3 along its length direction is square, and since the lifting block 51 has a half-circular arc appearance with an opening facing upward, when the square tube 3 is in place, the bottom surface of the square tube 3 is horizontal, and at this time, the square tube 3 does not contact the trigger roller 516, and during the rotation of the square tube 3 by 90 degrees, the edges of the square tube 3 follow the rotation and gradually move downward, and in this process, the edges of the square tube 3 press the trigger roller 516 downward into the trigger groove 512, the trigger roller 516 pushes the sliding block 513 to move downward, the sliding block 513 triggers the contact switch 515, and then the contact switch 515 sends a trigger signal to the control unit 12, and then the control unit 12 sends an instruction to the drive motor to control the rotation of the drive gear 55, thereby causing the protective plate 54 to pop out to both sides of the square tube 3, so that the protective plate 54 can surround and enclose the square tube 3 on both sides of the welding position. When the tensile force is detected, the welding position of the square tube 3 and the connecting corner piece 31 may have flying sparks and iron slag, and the protective plate 54 encloses the square tube 3 from both sides, which can prevent the flying sparks and iron slag from splashing on the surrounding workers, thereby effectively reducing the safety hazard.

[0052] The tensile force sensor 111 arranged between the stretching drive 11 and the rotating disc 14 can monitor the tensile force in real time when the square tube 3 is stretched, and a preset threshold of the tensile force and a breaking threshold can be input to the control unit 12 through the control software. When the tensile force sensor 111 monitors that the tensile force is greater than the preset threshold, a descending signal is sent to the control unit 12; when the tensile force sensor 111 monitors that the tensile force instantaneously decreases to the preset breaking threshold, a lifting signal is sent to the control unit 12. At the same time, the control logic written into the control unit 12 is as follows: when the control unit 12 receives the trigger signal of the contact switch 515, if the control unit 12 receives the descending signal of the tensile force sensor 111 again, the control unit 12 sends a descending instruction to the lifting member 52, the lifting member 52 drives the lifting block 51 to descend until the lifting block 51 is out of contact with the square tube 3; when the control unit 12 receives the trigger signal of the contact switch 515, if the control unit 12 receives the lifting signal of the tensile force sensor 111 again, the control unit 12 sends a lifting instruction to the lifting member 52, and the lifting member 52 drives the lifting block 51 to ascend until the lifting block 51 contacts the square tube 3.

[0053] When the tensile test of the square tube 3 is performed, the fixed square tube 3 is first installed, and then the square tube 3 is rotated by 90 degrees. At this time, the trigger switch sends a trigger signal to the control unit 12, and the two protective plates 54 are ejected to surround the position where the square tube 3 and the connecting angle piece 31 are welded. Then, the square tube 3 is gradually subjected to tensile force by the stretching driving piece 11, and when the tensile force sensor 111 monitors that the tensile force reaches a preset threshold, a lowering signal is sent to the control unit 12. Since the control unit 12 has previously received the trigger signal, the control unit 12 sends a lowering instruction to the lifting piece 52. At this time, the lifting piece 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 limiting column 41, thereby effectively avoiding the influence of friction on the square tube 3 during stretching. When the tensile force sensor 111 monitors that the tensile force instantaneously decreases to a preset breaking threshold during stretching, the tensile force sensor 111 sends a lifting signal to the control unit 12. Since the trigger signal has been previously received, the control unit 12 sends a lifting instruction to the lifting piece 52 at this time. The lifting piece 52 drives the lifting block 51 to rise until the lifting block 51 stops by receiving the square tube 3. At this time, the square tube 3 is supported by the lifting block 51, thereby avoiding the situation that the square tube 3 falls and injures the surrounding staff after breaking.

[0054] If the control unit 12 does not receive the trigger signal of the contact switch 515, but the tensile force sensor 111 has detected that the tensile force reaches the preset threshold, the lifting block 51 does not trigger the lowering, but instead issues an alarm to prompt the staff that the square tube 3 has not been rotated to the position. At this time, the friction still has an influence on the tensile force detection of the square tube 3. If the detection is completed, the square tube 3 is rotated by 90 degrees again. At this time, the rotation of the square tube 3 again triggers 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. At this time, the driving motor drives the two protective plates 54 to retract into the lifting block 51 through the driving gear 55.

[0055] The implementation principle of the tensile detection machine in the embodiment 1 is that the lifting piece 52 drives the square tube 3 to vertically rise through the lifting block 51, so that the square tube 3 is docked, thereby reducing the working strength of the staff. The square tube 3 is manually rotated by 90 degrees, so that the originally vertical limiting column 41 is rotated to the horizontal state. At this time, the entire weight of the square tube 3 can be supported by the horizontal limiting column 41, and the horizontal tensile force can be applied to the square tube 3 by the limiting column 41. The influence of the friction caused by contact on the tensile force detection can be avoided, so that the tensile force detection result of the square tube 3 is more accurate. The tensile force sensor 111 and the contact switch 515 will respectively 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 piece 52 and each driving piece according to different signals, so that the entire stretching detection process is safer. Embodiment 2

[0056] The difference between embodiment 2 and embodiment 1 is that Figure 2 and Figure 8 The support plate 7 is fixed at the top end of the output shaft of the lifting piece 52, is horizontally arranged, and extends away from the lifting piece 52 to the detection table 1, and is in sliding connection with the side wall of the detection table 1, so that when the lifting piece 52 drives the lifting block 51 to vertically slide up and down, the support plate 7 can stably support and guide the sliding of the lifting block 51 and the output shaft of the lifting piece 52. Even if the lifting block 51 supports a relatively heavy square tube 3, the lifting piece 51 can still stably lift the square tube 3. Therefore, a sliding groove for the sliding of the support plate 7 can be formed in the side wall of the detection table 1.

[0057] Further, the abutting plate 71 is integrally formed on the top surface of the support plate 7 close to the detection table 1, and is vertically arranged. When the square tube 3 is fixed to the rotating disc 14, a gap is left between the top end of the abutting plate 71 and the fixed disc 112, so as to avoid interference with other components. The receiving plate 72 is arranged on the side of the abutting plate 71 away from the detection table 1, and is also vertically arranged. The receiving plate 72 is in horizontal sliding connection with the top surface of the support plate 7. Therefore, a sliding groove for the sliding of the receiving plate 72 is formed in the top surface of the support plate 7. The top end of the receiving plate 72 is inserted into and in sliding connection with the abutting plate 71 through a sliding rod, so that the receiving plate 72 can stably reciprocate on the top surface of the support plate 7. When the square tube 3 is fixed to the rotating disc 14, a gap is left between the top of the receiving plate 72 and the fixed disc 112, and a gap is also left between the receiving plate 72 and the rotating disc 14.

[0058] The buffer 73 is arranged between the receiving plate 72 and the abutting plate 71. The buffer 73 can be a compression spring. The buffer 73 is horizontally arranged, and one end of the buffer 73 is fixedly connected with the receiving plate 72, and the other end of the buffer 73 is fixedly connected with the abutting plate 71. When the square tube 3 to be detected is pulled and broken during the tension detection, the square tube 3 and the rotating disc 14 and the like providing the pulling force may be displaced to both sides due to inertia. At this time, the receiving plate 72 can contact and slide with the rotating disc 14, and then the buffer 73 is compressed to absorb the impact force of the inertia of the components, so as to provide a horizontal buffer force for the components, and reduce the risk of damage to the equipment. 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.

[0059] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made on the basis of the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A tension detecting machine characterized by: The utility model relates to a square tube welding device The detection platform is provided with two spaced and opposite detection platforms, the square tube to be detected is placed between the two detection platforms and does not contact the detection platforms, the side wall of the detection platform is provided with a control unit; The rotating disc is correspondingly arranged on the detection platform, the rotating axis of the rotating disc is horizontal and extends along the corresponding direction of the two detection platforms, each of the two rotating discs is provided with a set of clamping assemblies on the opposite side walls for clamping and fixing the two ends of the square tube, and the rotating axes of the two rotating discs are used for coinciding with the axis of the square tube when the square tube is installed; The stretching driving part is correspondingly arranged on the rotating disc and is used for driving the corresponding rotating disc to reciprocate along the rotating axis direction; Two sets of supporting assemblies are further arranged between the two rotating discs and are used for corresponding welding position distribution of the square tube and the connecting corner piece, the supporting assembly comprises a lifting block and a lifting part corresponding to each other, the lifting part is electrically connected with the control unit and is used for driving the lifting block to reciprocate along the vertical direction, and the lifting block is used for supporting the square tube before the clamping assembly clamps the square tube; The lifting block is movably provided with a protection plate on both sides of the rotating axis direction of the lifting block, the top surface of the lifting block is provided with a trigger assembly, and the protection plate is controlled to pop out through the trigger assembly in the process of rotating the square tube to surround the welding position of the square tube from both sides of the square tube.

2. The tension detecting machine according to claim 1, characterized by: The clamping assembly comprises a limiting column and two fixing columns, the two fixing columns are perpendicular to the side wall of the rotating disc and are symmetrically and spacedly distributed along the rotating axis, the limiting column is vertically arranged on the two fixing columns, the spacing between the two fixing columns is used for placing the square tube, the limiting column is simultaneously arranged in and fixed in the two fixing columns, and the limiting column is simultaneously arranged in the connecting corner piece at the end of the square tube.

3. The tension detecting machine according to claim 1, characterized by: The lifting block has a circular arc appearance with an opening facing upward, the top surface of the lifting block is concave downward to form a placing groove, the placing groove is used for placing the square tube, the trigger assembly is arranged at the position with the lowest height of the top surface of the lifting block, the trigger assembly is touched by the edge of the square tube when the square tube rotates, the trigger assembly sends a trigger signal to the control unit, and the control unit controls the protection plate to pop out.

4. The tension detecting machine according to claim 3, characterized by: The trigger assembly comprises a trigger roller and a contact switch, the contact switch is electrically connected with the control unit, a trigger groove is vertically arranged at the position corresponding to the trigger assembly on the top surface of the lifting block, the trigger roller is movably connected in the trigger groove, the trigger roller moves downward to trigger the contact switch, the contact switch sends a signal to the control unit, a vertical elastic element is arranged in the trigger groove, and the elastic element is used for pushing the trigger roller to stretch out of the trigger groove.

5. The tension detector according to claim 4, characterized in that: A tension sensor is arranged between the stretching driving part and the rotating disc and is used for monitoring the tension of the square tube in real time, the tension sensor is electrically connected with the control unit, a descending signal is sent to the control unit when the tension sensor monitors that the tension is greater than a preset threshold value, and a lifting signal is sent to the control unit when the tension sensor monitors that the tension is instantaneously reduced to a preset breaking threshold value.

6. The tension detector according to claim 5, characterized in that: When the control unit receives the trigger signal of the contact switch, if the control unit further receives the descending signal of the tension sensor, the control unit sends a descending instruction to the lifting part, the lifting part drives the lifting block to descend until the lifting block is separated from the square tube. When the control unit receives the trigger signal of the contact switch, if the control unit receives the lifting signal of the tension sensor, the control unit sends a lifting instruction to the lifting member, the lifting member drives the lifting block to rise until the square tube is contacted.

7. The tension detecting machine according to claim 1, characterized by: The lifting member comprises an output shaft vertically upward, the top of the output shaft of the lifting member is fixed with the bottom surface of the lifting block, and the top end of the output shaft of the lifting member is further provided with a horizontal support plate, one end of the support plate away from the output shaft of the lifting member is slidably connected with the side wall of the detection table, and the other end of the support plate close to the detection table is provided with a buffer assembly, which is used for providing a horizontal buffer force to the rotating disc when the square tube to be detected is pulled off.

8. The tension detector according to claim 7, characterized in that: The buffer assembly comprises a receiving plate and a buffer member, the receiving plate is vertically placed, and the receiving plate is horizontally slidably connected with the top of the support plate, the buffer member is horizontally arranged between the end of the receiving plate and the support plate, one end of the buffer member is connected with the side wall of the receiving plate, and the other end is connected with the support plate, and in a normal state, a gap is left between the receiving plate and the rotating disc.

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