A tension detection device

Abstract

The present invention relates to the technical field of detection devices, and in particular to a tension detection device. A tension detection device includes two clamping mechanisms, each of which includes a fixing ring and four connecting components. The clamping component includes four locking flaps. The sides where the two right-angled sides of the locking flap are located are the first side and the second side, and the four first side surfaces form a first space. When the cross-section of the workpiece in the horizontal direction is circular or square, the first side surfaces of the four locking flaps will not move after contacting the workpiece. When the cross-section of the workpiece in the horizontal direction is rectangular, in the process of the four locking flaps approaching each other, two of the locking flaps will not move after contacting the two side edges in the length direction of the rectangular workpiece. The other two locking flaps continue to approach each other until they contact the two side edges in the width direction of the rectangular workpiece and will not move. The present invention provides a tension detection device to solve the problem that existing detection equipment cannot adapt to a variety of workpiece shapes.

Description

Technical Field

[0001] The present invention relates to the technical field of detection devices, and in particular to a tension detection device. Background Art

[0002] Tensile testing device is a device used to measure the strength and performance of materials under tensile force. Tensile testing devices include tensile testing devices for building materials used in construction projects, mechanical testing machines, tensile testing devices for lifting chain production, simple tensile testing devices, and tensile testing equipment in specific fields. Tensile testing machine is also known as universal material testing machine. Universal testing machine is a mechanical force testing machine used to perform mechanical performance tests such as static load, stretching, compression, bending, shearing, tearing, and peeling on various materials. It is suitable for various physical and mechanical performance tests of plastic sheets, pipes, special-shaped materials, plastic films, rubber, wires and cables, steel and other materials. It is an indispensable testing equipment for material development, physical property testing, teaching research, quality control, etc. The tensile machine fixture is an important part of the instrument. Different materials require different fixtures, which is also an important factor in whether the test can be carried out smoothly and the accuracy of the test results. The measurement of the force value of the tensile testing machine is completed through a force sensor, an amplifier and a data processing system.

[0003] For example, the invention patent application with the announcement number CN114062122A provides a tensile testing machine, which can quickly test the tensile force of the filter element through the measurement components and the detachable pipe clamp used to suspend and fix the test piece in the air, and the test process is simple and fast. However, the testing equipment can only adapt to round or square test pieces. When the shape of the part is changed, the chuck of the fixture needs to be replaced to adapt to the shape of the test piece. The replacement process is cumbersome and time-consuming. Summary of the invention

[0004] The invention provides a tension detection device to solve the problem that the existing detection equipment cannot adapt to various workpiece shapes.

[0005] A tension detection device of the present invention adopts the following technical solution: a tension detection device includes a frame and two clamping mechanisms, a workpiece is vertically arranged on the frame, and the two clamping mechanisms are used to clamp the upper part and the lower part of the workpiece respectively. Each clamping mechanism includes a fixing ring, a clamping assembly and four connecting assemblies. The fixing ring is slidably arranged on the frame up and down, the axis of the fixing ring is arranged along the vertical direction, a plurality of fixing rods are fixedly arranged on the inner peripheral wall of the fixing ring, the plurality of fixing rods are sequentially distributed along the circumference of the fixing ring, and each fixing rod is arranged along the radial direction of the fixing ring.

[0006] Each connecting assembly includes a sleeve, a connecting plate and a first spring. The sleeve is arranged along the radial direction of the fixing ring. One end of each sleeve is slidably sleeved on a fixing rod, and the other end of each sleeve is fixedly connected to the connecting plate. The first spring connects the sleeve and the fixing rod. The connecting plate is arranged obliquely, and along the direction from the upper and lower ends of the workpiece to the middle of the workpiece, the connecting plate gradually approaches the center of the fixing ring.

[0007] The clamping assembly includes four locking petals, each of which is slidably arranged on a connecting plate up and down, and the locking petals can slide on the connecting plate along the tangent direction of the fixing ring. The four locking petals are distributed in sequence along the circumference of the fixing ring, and the cross-section of the locking petals in the horizontal direction is fan-shaped, and the sides where the two straight edges of the fan-shaped locking petals are located are the first side and the second side. The first side of the locking petal includes a first part and a second part, and the first part of the locking petal and the second part of the locking petal are distributed in sequence along the direction gradually away from the center of the fixing ring. The first part of each locking petal is used to abut against the workpiece, and the second part of each locking petal is slidably connected to the second side of the adjacent locking petal. The first parts of the four first side surfaces form a first space, the size of which can be changed, and the workpiece is in the first space.

[0008] Furthermore, the two sides of the fixing ring along the up-down direction are respectively the first side and the second side, and a connecting frame is fixedly arranged on the first side of the fixing ring. A tension detection device also includes a transmission mechanism, the transmission mechanism includes a first adjustment disk, a second adjustment disk and a plurality of limit rods, the first adjustment disk, the second adjustment disk and the fixing ring are concentrically arranged, and the second adjustment disk and the first adjustment disk are sequentially distributed along the direction from the first side to the second side of the fixing ring. The first adjustment disk and the second adjustment disk can be synchronously slid up and down on the connecting frame, and the first adjustment disk can rotate relative to the second adjustment disk.

[0009] The first adjusting disk is provided with a plurality of first arc grooves, which are sequentially distributed along the circumference of the fixing ring. The two ends of the first arc groove are respectively the first end and the second end, which are sequentially distributed along the circumference of the first adjusting disk, and the first end of the first arc groove is closer to the center of the fixing ring than the second end. The second adjusting disk is provided with a plurality of second arc grooves, which are sequentially distributed along the circumference of the fixing ring. Each second arc groove is arranged in parallel with a first arc groove, and corresponds to each other one by one.

[0010] A connecting disk is fixedly arranged on each sleeve, and the connecting disk and the sleeve are arranged concentrically. Each limiting rod passes through a second arc groove and a first arc groove in sequence from top to bottom, and the limiting rod is slidably arranged in the first arc groove and the second arc groove, and each limiting rod is used to abut against one side of a connecting disk close to the center of the fixed ring.

[0011] Furthermore, a through hole is provided on the peripheral wall of the sleeve, and the through hole is located on one side of the connecting disk close to the center of the fixed ring, and each limiting rod is slidably arranged in a through hole. A plurality of slots are provided on each fixed rod, and the plurality of slots are sequentially distributed along the axial direction of the fixed rod, and the limiting rod is arranged in the slots. Two anti-deflection plates are fixedly provided on the peripheral wall of the sleeve, and the two anti-deflection plates are distributed along the circumference of the sleeve, and the through hole is located between the two anti-deflection plates.

[0012] Furthermore, the limiting rod can be extended and retracted, and a second spring is arranged in each limiting rod.

[0013] Furthermore, a thread groove is formed on the second adjusting disk, and the transmission mechanism further comprises a locking knob, which is arranged in the thread groove, and the lower end surface of the locking knob is in frictional contact with the upper end surface of the first adjusting disk.

[0014] Further, each connecting plate is provided with a sliding plate, which can slide on the connecting plate along the radial direction of the fixing ring. Each sliding plate is provided with a limiting groove, and the limiting groove and the connecting plate are arranged in parallel. A sliding block is fixedly arranged on each locking petal. Each sliding block is slidably arranged in a limiting groove up and down, and a third spring is fixedly arranged in each limiting groove, and the third spring is fixedly connected to the sliding block.

[0015] Furthermore, a first side surface of each locking flap is provided with a plurality of anti-slip teeth, and the plurality of anti-slip teeth are sequentially distributed along the up-down direction.

[0016] Furthermore, a tension detection device also includes a driving mechanism and a tension sensor, the driving mechanism includes two first hydraulic cylinders, the first hydraulic cylinders are fixedly arranged on the frame, and the two first hydraulic cylinders are distributed along the up-down direction. The extended end of the first hydraulic cylinder on the upper side is fixedly connected to the tension sensor, and the tension sensor is fixedly connected to the connecting frame on the upper side, and the tension sensor is used to detect the force condition of the workpiece. The extended end of the first hydraulic cylinder on the lower side is fixedly connected to the connecting frame on the lower side.

[0017] Furthermore, each clamping mechanism also includes a second hydraulic cylinder, each second hydraulic cylinder is fixedly disposed on a connecting frame, and an extended end of each second hydraulic cylinder is fixedly connected to a second adjusting disk.

[0018] Furthermore, a T-shaped slot is formed on a first side surface of each locking petal, a T-shaped block is formed on a second side surface of each locking petal, and each T-shaped block is slidably disposed in a T-shaped slot.

[0019] Furthermore, a tension detection device also includes a detection mechanism, which includes a tension sensor. The tension sensor is fixedly arranged at the lower end of the first hydraulic cylinder on the upper side, and the tension sensor is fixedly connected to the connecting frame on the upper side. The tension sensor is used to detect the force condition of the workpiece.

[0020] The beneficial effects of the present invention are as follows: a tension detection device of the present invention has four locking petals, and in the initial state, the four locking petals are relatively close to each other, the first space is a square, and the area of ​​the first space is the smallest. The locking petals are moved synchronously, so that the four locking petals gradually move away from each other, and the area of ​​the first space gradually increases, until the area of ​​the first space increases to the maximum, and the first space is still a square.

[0021] Place the workpiece into the first space, and move the four locking petals synchronously again so that the four locking petals approach each other. When the cross-section of the workpiece in the horizontal direction is circular or square, the first side surfaces of the four locking petals will not move after contacting the workpiece. When the cross-section of the workpiece in the horizontal direction is rectangular, during the process of the four locking petals approaching each other, two of the locking petals will not move after contacting the two side edges in the length direction of the rectangular workpiece. The other two locking petals continue to approach each other until they contact the two side edges in the width direction of the rectangular workpiece and will not move. Under the action of the first spring, the locking petals clamp the workpiece. A tension detection device can perform clamping tests on workpieces of various cross-sectional shapes, has stronger adaptability, reduces the time for changing fixtures, and improves detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 A schematic structural diagram of a tension detection device provided by an embodiment of the present invention;

[0024] Figure 2 An exploded diagram of a tension detection device provided by an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the structure of a clamping mechanism of a tension detection device provided by an embodiment of the present invention when clamping a square workpiece;

[0026] Figure 4 for Figure 3 Sectional view at AA in the middle;

[0027] Figure 5 for Figure 4 The enlarged view of point B in the middle;

[0028] Figure 6 A schematic diagram of the structure of a clamping mechanism of a tension detection device provided by an embodiment of the present invention clamping a rectangular workpiece;

[0029] Figure 7 for Figure 6 Sectional view at CC;

[0030] Figure 8 for Figure 7 The enlarged view of point D in the middle;

[0031] Fig. 9 A partial structural schematic diagram of a clamping mechanism of a tension detection device provided by an embodiment of the present invention;

[0032] Fig.10 A schematic structural diagram of a clamping mechanism of a tension detection device provided in an embodiment of the present invention.

[0033] In the figure: 100, frame; 200, first hydraulic cylinder; 301, fixing ring; 302, second adjusting disk; 3021, second arc groove; 3022, thread groove; 303, first adjusting disk; 3031, first arc groove; 304, limiting rod; 3041, second spring; 305, locking flap; 3052, sliding plate; 3053, third spring; 3054, anti-slip teeth; 3055, limiting groove; 3056, T-block; 3057, T-slot; 306, sleeve; 3061, anti-bias plate; 3062, connecting disk; 3063, through hole; 3064, first spring; 307, locking knob; 308, fixing rod; 3081, slot; 310, connecting plate; 320, connecting frame; 330, tension sensor; 340, second hydraulic cylinder. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Reference Figures 1 to 10 As shown, a tension detection device provided by an embodiment of the present invention includes a frame 100 and two clamping mechanisms, a workpiece is vertically arranged on the frame 100, and the two clamping mechanisms are used to clamp the upper part and the lower part of the workpiece respectively. Each clamping mechanism includes a fixing ring 301, a clamping assembly and four connecting assemblies. The fixing ring 301 is slidably arranged on the frame 100 up and down, the axis of the fixing ring 301 is arranged along the vertical direction, and a plurality of fixing rods 308 are fixedly arranged on the inner peripheral wall of the fixing ring 301, and the plurality of fixing rods 308 are sequentially distributed along the circumference of the fixing ring 301, and each fixing rod 308 is arranged along the radial direction of the fixing ring 301.

[0036] Each connecting assembly includes a sleeve 306, a connecting plate 310 and a first spring 3064. The sleeve 306 is arranged along the radial direction of the fixing ring 301. One end of each sleeve 306 is slidably sleeved on a fixing rod 308, and the other end of each sleeve 306 is fixedly connected to the connecting plate 310. The first spring 3064 connects the sleeve 306 and the fixing rod 308. The connecting plate 310 is arranged obliquely, and along the direction from the upper and lower ends of the workpiece to the middle of the workpiece, the connecting plate 310 gradually approaches the center of the fixing ring 301.

[0037] The clamping assembly includes four locking flaps 305, each of which is slidably disposed on a connecting plate 310, and the locking flap 305 can slide on the connecting plate 310 along the tangent direction of the fixing ring 301. The four locking flaps 305 are sequentially distributed along the circumference of the fixing ring 301, and the cross section of the locking flap 305 in the horizontal direction is fan-shaped, and the sides where the two straight edges of the fan-shaped locking flap 305 are located are the first side and the second side. The first side of the locking flap 305 includes a first part and a second part, and the first part of the locking flap 305 and the second part of the locking flap 305 are sequentially distributed along the direction gradually away from the center of the fixing ring 301, and the first part of each locking flap 305 is used to abut against the workpiece, and the second part of each locking flap 305 is slidably connected to the second side of the adjacent locking flap 305. The first parts of the four first side surfaces form a first space, the size of which can be changed, and the workpiece is in the first space.

[0038] In the initial state, the four locking petals 305 are close to each other, the first space is a square, and the area of ​​the first space is the smallest. The two clamping mechanisms are respectively placed at the upper and lower parts of the workpiece. The locking petals 305 are moved synchronously so that the four locking petals 305 gradually move away from each other, and the area of ​​the first space gradually increases until the area of ​​the first space increases to the maximum and the first space is still a square.

[0039] The workpiece is placed in the first space, and the four locking flaps 305 are synchronously moved again so that the four locking flaps 305 are close to each other. When the cross section of the workpiece in the horizontal direction is circular or square, the first side surfaces of the four locking flaps 305 contact the workpiece and then stop moving. Under the action of the first spring 3064, the locking flaps 305 clamp the workpiece.

[0040] When the cross-section of the workpiece in the horizontal direction is a rectangle, among the four connecting components, two connecting components are first connecting components, the two first connecting components are respectively located at the two sides in the length direction of the rectangular workpiece, and the two second connecting components are respectively located at the two sides in the width direction of the rectangular workpiece.

[0041] The locking flap 305 in the first connecting component first abuts against the two sides in the length direction of the rectangular workpiece, and then the locking flap 305 in the first connecting component does not move. At this time, the locking flap 305 in the second connecting component has not yet abutted against the workpiece, and the locking flap 305 in the second connecting component continues to move toward the center of the fixed ring 301, and the locking flap 305 moves along the tangential direction of the fixed ring 301 on the connecting plate 310, and the first space forms a rectangle corresponding to the workpiece. A tension detection device can perform clamping tests on workpieces of various cross-sectional shapes, has stronger adaptability, reduces the time for changing fixtures, and improves detection efficiency.

[0042] In this embodiment, the two sides of the fixing ring 301 along the up-down direction are respectively the first side and the second side, and a connecting frame 320 is fixedly arranged on the first side of the fixing ring 301. A tension detection device also includes a transmission mechanism, the transmission mechanism includes a first adjustment disk 303, a second adjustment disk 302 and a plurality of limit rods 304, the first adjustment disk 303, the second adjustment disk 302 and the fixing ring 301 are concentrically arranged, and the second adjustment disk 302 and the first adjustment disk 303 are sequentially distributed along the direction from the first side to the second side of the fixing ring 301. The first adjustment disk 303 and the second adjustment disk 302 are synchronously slidably arranged on the connecting frame 320, and the first adjustment disk 303 can rotate relative to the second adjustment disk 302.

[0043] The first adjusting disk 303 is provided with a plurality of first arc grooves 3031, which penetrate the first adjusting disk 303 and are sequentially distributed along the circumference of the fixing ring 301. The two ends of the first arc groove 3031 are respectively the first end and the second end, and the first end and the second end of the first arc groove 3031 are sequentially distributed along the circumference of the first adjusting disk 303, and the first end of the first arc groove 3031 is closer to the center of the fixing ring 301 than the second end. The second adjusting disk 302 is provided with a plurality of second arc grooves 3021, and the plurality of second arc grooves 3021 are sequentially distributed along the circumference of the fixing ring 301. Each second arc groove 3021 is arranged in parallel with a first arc groove 3031, and corresponds to each other one by one.

[0044] A connection disk 3062 is fixedly disposed on each sleeve 306, and the connection disk 3062 is concentrically disposed with the sleeve 306. Each limiting rod 304 passes through a second arc groove 3021 and a first arc groove 3031 in sequence from top to bottom, and the limiting rod 304 is slidably disposed in the first arc groove 3031 and the second arc groove 3021, and each limiting rod 304 is used to abut against one side of a connection disk 3062 close to the center of the fixing ring 301.

[0045] The first adjusting disk 303 is manually rotated, and the first adjusting disk 303 rotates forward relative to the second adjusting disk 302, thereby pushing the limiting rod 304 to move in the first arc groove 3031 and the second arc groove 3021, and the limiting rod 304 gradually moves away from the center of the fixing ring 301. The limiting rod 304 pushes the connecting disk 3062 to move in the horizontal direction, so that the connecting disk 3062 moves in the direction away from the center of the fixing ring 301, and the connecting disk 3062 drives the sleeve 306 and the locking petal 305 to move synchronously in the direction away from the center of the fixing ring 301.

[0046] In this embodiment, a through hole 3063 is provided on the peripheral wall of the sleeve 306. The through hole 3063 is vertically arranged and penetrates the sleeve 306. The through hole 3063 is located on the side of the connecting plate 3062 close to the center of the fixed ring 301. Each limiting rod 304 is slidably arranged in a through hole 3063. A plurality of slots 3081 are provided on each fixed rod 308. The plurality of slots 3081 are sequentially distributed along the axial direction of the fixed rod 308. The limiting rod 304 is arranged in the slots 3081. Two anti-deflection plates 3061 are fixedly arranged on the peripheral wall of the sleeve 306. The two anti-deflection plates 3061 are distributed along the circumference of the sleeve 306, and the through hole 3063 is located between the two anti-deflection plates 3061. When the limiting rod 304 is in the slots 3081 and the through hole 3063, the fixed rod 308 and the sleeve 306 no longer move relative to each other.

[0047] In this embodiment, the limiting rods 304 are retractable, and a second spring 3041 is disposed in each limiting rod 304 .

[0048] In this embodiment, a thread groove 3022 is provided on the second adjusting disk 302, and the thread groove 3022 is vertically arranged and penetrates the second adjusting disk 302. The transmission mechanism also includes a locking knob 307, which is arranged in the thread groove 3022, and the lower end surface of the locking knob 307 is in frictional contact with the upper end surface of the first adjusting disk 303. When the lower end surface of the locking knob 307 is in contact with the upper end surface of the first adjusting disk 303, the first adjusting disk 303 and the second adjusting disk 302 no longer rotate relative to each other.

[0049] In this embodiment, a sliding plate 3052 is provided on each connecting plate 310, and the sliding plate 3052 can slide on the connecting plate 310 along the radial direction of the fixing ring 301. A limiting groove 3055 is provided on each sliding plate 3052, and the limiting groove 3055 is arranged parallel to the connecting plate 310. A sliding block is fixedly provided on each locking petal 305. Each sliding block is slidably provided in a limiting groove 3055, and a third spring 3053 is fixedly provided in each limiting groove 3055, and the third spring 3053 is fixedly connected to the sliding block.

[0050] After the two clamping mechanisms clamp the two ends of the workpiece, the two clamping mechanisms move in opposite directions to apply tension to the workpiece. When the fixing ring 301 moves in the direction away from the middle of the workpiece, the fixing ring 301 and the connecting plate 310 move relative to the locking flap 305, that is, the locking flap 305 moves relative to the connecting plate 310 from the first side to the second side of the fixing ring 301. At this time, the sliding block slides in the limiting groove 3055, and the third spring 3053 is compressed. Since the connecting plate 310 is tilted, when the locking flap 305 moves relative to the connecting plate 310, the connecting plate 310 further pushes the locking flap 305, so that the four locking flaps 305 are further close to each other, thereby further clamping the workpiece.

[0051] In this embodiment, a first side surface of each locking flap 305 is provided with a plurality of anti-slip teeth 3054, and the plurality of anti-slip teeth 3054 are sequentially distributed along the vertical direction. The anti-slip teeth 3054 abut against the workpiece to prevent the locking flap 305 and the workpiece from slipping.

[0052] In this embodiment, a tension detection device further includes a driving mechanism and a tension sensor 330. The driving mechanism includes two first hydraulic cylinders 200. The first hydraulic cylinders 200 are fixedly arranged on the frame 100, and the two first hydraulic cylinders 200 are distributed in the up-down direction. The extended end of the first hydraulic cylinder 200 on the upper side is fixedly connected to the tension sensor 330, and the tension sensor 330 is fixedly connected to the connecting frame 320 on the upper side. The tension sensor 330 is used to detect the force of the workpiece. The extended end of the first hydraulic cylinder 200 on the lower side is fixedly connected to the connecting frame 320 on the lower side.

[0053] In this embodiment, each clamping mechanism further includes a second hydraulic cylinder 340 . Each second hydraulic cylinder 340 is fixedly disposed on a connecting frame 320 , and an extended end of each second hydraulic cylinder 340 is fixedly connected to a second adjusting disk 302 .

[0054] In this embodiment, a T-slot 3057 is formed on the first side of each locking flap 305 , and a T-block 3056 is disposed on the second side of each locking flap 305 . Each T-block 3056 is slidably disposed in a T-slot 3057 .

[0055] Working process: In the initial state, the four locking petals 305 are close to each other, two adjacent locking petals 305 are staggered, and the four first side surfaces form a first space in the middle of the four locking petals 305, and the first space is square. In the initial state, each limit rod 304 is in a through hole 3063 and in a slot 3081. The lower end surface of the locking knob 307 is out of contact with the upper end surface of the first adjustment disk 303.

[0056] First, the first hydraulic cylinder 200 and the second hydraulic cylinder 340 are started. The two first hydraulic cylinders 200 drive the two connecting frames 320 to move up and down respectively, so that the two clamping mechanisms are located at the upper and lower parts of the workpiece respectively. The second hydraulic cylinder 340 drives the second adjustment disk 302 to move, and the second adjustment disk 302 drives the first adjustment disk 303 to move synchronously. The first adjustment disk 303 and the second adjustment disk 302 move in the direction from the second side to the first side of the fixing ring 301, that is, the first adjustment disk 303 and the second adjustment disk 302 move in the direction away from the fixing ring 301.

[0057] The second adjusting disk 302 drives the limiting rod 304 to move synchronously in the vertical direction, so that the limiting rod 304 is separated from the slot 3081 and the through hole 3063, and at this time, the peripheral wall of the limiting rod 304 abuts against the connecting disk 3062. The first adjusting disk 303 is manually rotated, and the first adjusting disk 303 rotates forward relative to the second adjusting disk 302, thereby pushing the limiting rod 304 to move in the first arc groove 3031 and the second arc groove 3021, and the limiting rod 304 gradually moves away from the center of the fixing ring 301. The limiting rod 304 pushes the connecting disk 3062 to move in the horizontal direction, so that the connecting disk 3062 moves in a direction away from the center of the fixing ring 301, and the connecting disk 3062 drives the sleeve 306 and the locking petal 305 to move synchronously in a direction away from the center of the fixing ring 301, and at this time, the first spring 3064 is compressed.

[0058] The four limit rods 304 drive the four locking petals 305 to move synchronously, and the four locking petals 305 gradually move away from each other, and the area of ​​the first space gradually increases. When the limit rods 304 can no longer move, the first space is a square, and the area of ​​the first space is the largest. At this time, the locking knob 307 is rotated forward, so that the lower end surface of the locking knob 307 and the upper end surface of the first adjustment disk 303 are against each other, and then the first adjustment disk 303 and the second adjustment disk 302 no longer rotate relative to each other.

[0059] After that, the workpiece is placed in the first space, and the upper and lower ends of the workpiece are respectively in the two first spaces. Then, the locking knob 307 is rotated in the opposite direction, so that the first adjustment disk 303 and the second adjustment disk 302 can rotate relative to each other. The first spring 3064 is reset, and the first spring 3064 drives the sleeve 306 to move in the direction close to the center of the fixed ring 301, and the sleeve 306 drives the locking petals 305 to move synchronously, so that the four locking petals 305 are close to each other, and the area of ​​the first space is gradually reduced. When the sleeve 306 moves, the limit rod 304 is pushed to move in the direction close to the center of the fixed ring 301 through the connecting disk 3062, so that the first adjustment disk 303 rotates in the opposite direction relative to the second adjustment disk 302.

[0060] When the cross section of the workpiece in the horizontal direction is circular or square, the first side surfaces of the four locking petals 305 will not move after contacting the workpiece. Under the action of the first spring 3064, the locking petals 305 clamp the workpiece. The second hydraulic cylinder 340 drives the first adjustment disk 303 and the second adjustment disk 302 to move toward the fixing ring 301, and the limiting rod 304 is pressed into the through hole 3063 and the slot 3081 again, so that the sleeve 306 and the fixing rod 308 are locked, and the sleeve 306 and the fixing rod 308 no longer move relative to each other.

[0061] When the cross section of the workpiece in the horizontal direction is a rectangle, among the four connecting components, two connecting components are first connecting components, the two first connecting components are respectively located at the two sides in the length direction of the rectangular workpiece, and the two second connecting components are respectively located at the two sides in the width direction of the rectangular workpiece. When the four locking petals 305 simultaneously approach the center of the fixed ring 301, the locking petals 305 in the first connecting component first abut against the two sides in the length direction of the rectangular workpiece, and then the locking petals 305 in the first connecting component no longer move.

[0062] At this time, the locking flap 305 in the second connecting assembly has not yet abutted against the workpiece, and the locking flap 305 in the second connecting assembly continues to move toward the center of the fixing ring 301, and the locking flap 305 moves along the tangential direction of the fixing ring 301 on the connecting plate 310, and the first space forms a rectangle corresponding to the workpiece. The connecting disk 3062 on the sleeve 306 in the second connecting assembly continues to push the limiting rod 304 to move toward the center of the fixing ring 301, thereby causing the first adjusting disk 303 to rotate in the opposite direction relative to the second adjusting disk 302. When the first adjusting disk 303 rotates, it drives all the limiting rods 304 to move synchronously, and at this time, the limiting rod 304 in each first connecting assembly moves in a direction gradually away from the corresponding connecting disk 3062.

[0063] When the locking petal 305 in the second connecting assembly abuts against the workpiece, the first adjusting disk 303 and the second adjusting disk 302 are driven by the second hydraulic cylinder 340 to move toward the direction close to the fixing ring 301, and the limiting rod 304 in the second connecting assembly is pressed into the through hole 3063 and the slot 3081 again, and the sleeve 306 and the fixing rod 308 are locked, so that the sleeve 306 and the fixing rod 308 no longer move relative to each other. At this time, the limiting rod 304 in the first connecting assembly is shortened, and the lower end of the limiting rod 304 abuts against the peripheral wall of the sleeve 306.

[0064] Finally, the first hydraulic cylinder 200 is started, and the two first hydraulic cylinders 200 drive the two clamping mechanisms to move in opposite directions. After the two clamping mechanisms clamp the two ends of the workpiece, a pulling force is applied to the workpiece. Since the four locking petals 305 clamp the workpiece, when the fixing ring 301 moves in a direction away from the middle of the workpiece, the fixing ring 301 and the connecting plate 310 move relative to the locking petals 305, that is, the locking petals 305 move relative to the connecting plate 310 from the first side of the fixing ring 301 to the second side. Figure 5 As shown, the locking flap 305 is moved downward relative to the connecting plate 310.

[0065] Since the connecting plate 310 is tilted, when the locking flap 305 moves relative to the connecting plate 310, the connecting plate 310 further pushes the locking flap 305, so that the four locking flaps 305 are further approached to each other, thereby further clamping the workpiece. Then, the tension sensor 330 detects the tension on the workpiece.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tension detection device, characterized in that: It comprises a frame and two clamping mechanisms, the workpiece is vertically arranged on the frame, and the two clamping mechanisms are used to clamp the upper part and the lower part of the workpiece respectively; each clamping mechanism comprises a fixing ring, a clamping assembly and four connecting assemblies; the fixing ring is slidably arranged on the frame, the axis of the fixing ring is arranged along the vertical direction, a plurality of fixing rods are fixedly arranged on the inner peripheral wall of the fixing ring, the plurality of fixing rods are sequentially distributed along the circumference of the fixing ring, and each fixing rod is arranged along the radial direction of the fixing ring; Each connecting assembly includes a sleeve, a connecting plate and a first spring. The sleeve is arranged along the radial direction of the fixing ring. One end of each sleeve is slidably sleeved on a fixing rod, and the other end of each sleeve is fixedly connected to the connecting plate. The first spring connects the sleeve and the fixing rod. The connecting plate is arranged obliquely, and along the direction from the upper and lower ends of the workpiece to the middle of the workpiece, the connecting plate gradually approaches the center of the fixing ring. The clamping assembly includes four locking petals, each of which is slidably arranged on a connecting plate up and down, and the locking petals can slide on the connecting plate along the tangent direction of the fixing ring; the four locking petals are distributed in sequence along the circumference of the fixing ring, and the cross-section of the locking petals in the horizontal direction is fan-shaped, and the sides where the two straight edges of the fan-shaped locking petals are located are the first side and the second side; the first side of the locking petal includes a first part and a second part, and the first part of the locking petal and the second part of the locking petal are distributed in sequence along a direction gradually away from the center of the fixing ring, the first part of each locking petal is used to resist the workpiece, and the second part of each locking petal is slidably connected to the second side of the adjacent locking petal; the first parts of the four first side surfaces form a first space, the size of the first space can be changed, and the workpiece is in the first space.

2. A tension detection device according to claim 1, characterized in that: The two sides of the fixing ring along the up-down direction are respectively a first side and a second side, and a connecting frame is fixedly arranged on the first side of the fixing ring; a tension detection device also includes a transmission mechanism, the transmission mechanism includes a first adjustment disk, a second adjustment disk and a plurality of limit rods, the first adjustment disk, the second adjustment disk and the fixing ring are concentrically arranged, and the second adjustment disk and the first adjustment disk are sequentially distributed along the direction from the first side to the second side of the fixing ring; the first adjustment disk and the second adjustment disk can be synchronously slid up and down on the connecting frame, and the first adjustment disk can rotate relative to the second adjustment disk; The first adjusting disk is provided with a plurality of first arc grooves, which are sequentially distributed along the circumference of the fixing ring; the two ends of the first arc groove are respectively a first end and a second end, which are sequentially distributed along the circumference of the first adjusting disk, and the first end of the first arc groove is closer to the center of the fixing ring than the second end; the second adjusting disk is provided with a plurality of second arc grooves, which are sequentially distributed along the circumference of the fixing ring; each second arc groove is arranged in parallel with a first arc groove, and corresponds to each other one by one; A connecting disk is fixedly arranged on each sleeve, and the connecting disk and the sleeve are arranged concentrically; each limiting rod passes through a second arc groove and a first arc groove in sequence from top to bottom, the limiting rod is slidably arranged in the first arc groove and the second arc groove, and each limiting rod is used to abut against one side of a connecting disk close to the center of the fixed ring.

3. A tension detection device according to claim 2, characterized in that: A through hole is provided on the peripheral wall of the sleeve, and the through hole is located on one side of the connecting disk close to the center of the fixed ring. Each limiting rod is slidably arranged in a through hole up and down; a plurality of slots are provided on each fixed rod, and the plurality of slots are distributed in sequence along the axial direction of the fixed rod, and the limiting rod is arranged in the slots; two anti-deflection plates are fixedly provided on the peripheral wall of the sleeve, and the two anti-deflection plates are distributed along the circumference of the sleeve, and the through hole is located between the two anti-deflection plates.

4. A tension detection device according to claim 2, characterized in that: The limiting rod can be extended and retracted, and a second spring is arranged in each limiting rod.

5. A tension detection device according to claim 2, characterized in that: The second adjusting disk is provided with a thread groove, and the transmission mechanism further comprises a locking knob, which is arranged in the thread groove, and the lower end surface of the locking knob is in frictional contact with the upper end surface of the first adjusting disk.

6. A tension detection device according to claim 1, characterized in that: A sliding plate is provided on each connecting plate, and the sliding plate can slide on the connecting plate along the radial direction of the fixing ring; a limiting groove is provided on each sliding plate, and the limiting groove and the connecting plate are arranged in parallel; a sliding block is fixedly provided on each locking petal; each sliding block is slidably arranged in a limiting groove up and down, and a third spring is fixedly provided in each limiting groove, and the third spring is fixedly connected to the sliding block.

7. A tension detection device according to claim 1, characterized in that: A plurality of anti-slip teeth are disposed on the first side surface of each locking flap, and the plurality of anti-slip teeth are sequentially distributed along the up-down direction.

8. A tension detection device according to claim 2, characterized in that: It also includes a driving mechanism and a tension sensor. The driving mechanism includes two first hydraulic cylinders. The first hydraulic cylinders are fixedly arranged on the frame, and the two first hydraulic cylinders are distributed in the up and down directions. The extended end of the first hydraulic cylinder on the upper side is fixedly connected to the tension sensor, and the tension sensor is fixedly connected to the connecting frame on the upper side. The tension sensor is used to detect the force condition of the workpiece. The extended end of the first hydraulic cylinder on the lower side is fixedly connected to the connecting frame on the lower side.

9. A tension detection device according to claim 1, characterized in that: Each clamping mechanism also includes a second hydraulic cylinder, each second hydraulic cylinder is fixedly arranged on a connecting frame, and the extended end of each second hydraulic cylinder is fixedly connected to a second adjusting disk.

10. A tension detection device according to claim 1, characterized in that: A T-shaped slot is formed on the first side surface of each locking petal, and a T-shaped block is formed on the second side surface of each locking petal. Each T-shaped block is slidably disposed in a T-shaped slot.

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