A bolt strength testing device

Abstract

The present invention relates to the field of fastener testing technology, and in particular to a bolt strength testing device. The technical problem is that when the existing testing device tests the bolt, it is difficult to keep the same position of the bolt clamp and the bolt screwed in each time during the test, resulting in low accuracy of the test data, and the bolt assembly and disassembly process is cumbersome, affecting the test efficiency. A bolt strength testing device includes a housing, a tensile testing machine, a bolt clamp, a locking rod, a clamping screw, a positioning block, a detection bolt, etc.; a tensile testing machine is fixedly connected to the housing, and a bolt clamp is clamped on the tensile testing machine. The bolt detection sleeve and the detection bolt are screwed together by rotating the output shaft of the servo motor, so that the bolt detection sleeve can be automatically screwed onto the detection bolt, thereby improving the detection efficiency, and the bolt detection sleeve is screwed in the same position on the bolt during each bolt detection process, thereby improving the accuracy of the bolt tensile strength test data.

Description

Technical Field

[0001] The invention relates to the technical field of fastener testing, and in particular to a bolt strength testing device. Background Art

[0002] A bolt is a cylindrical threaded fastener that is matched with a nut. It needs to cooperate with the nut to fasten two parts with through holes. This type of connection is a detachable connection. In order to ensure production quality during the bolt production process, the bolts are generally sampled and subjected to a series of strength tests. The bolt tensile strength test is an important test to evaluate the quality and performance of the bolt. It mainly measures the tensile performance of the bolt under tension, so as to evaluate the reliability and safety of the bolt and ensure that it can withstand the corresponding tensile load without failure in actual applications.

[0003] During the test, the special fixture and the inspection bolt are usually screwed together manually, and then a tensile force is applied to the bolt by pulling the bolt fixture until the bolt is pulled to obtain the bolt tensile strength data. However, when the existing test device is testing the bolt, it is difficult to ensure that the screwing position of the bolt fixture and the bolt remains the same each time the test is performed, which leads to low accuracy of the test data and cumbersome bolt assembly and disassembly process. The existing test device is not convenient for automatically screwing the bolt inspection sleeve onto the inspection bolt sleeve, which leads to inconvenience in operation, thereby affecting the bolt test efficiency. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies of the above-mentioned prior art and provide a bolt strength testing device which can automatically screw a bolt inspection sleeve onto a detection bolt sleeve, is easy to operate, thereby improving the detection efficiency, and can make the bolt inspection sleeve screwed on the detection bolt in the same position, thereby improving the accuracy of the bolt tensile strength test data.

[0005] The technical solution of the present invention is: a bolt strength testing device, including a housing, a tensile testing machine, a bolt clamp, a locking rod, a clamping screw, a positioning block, a detection bolt, a rotating component, a limiting component and an auxiliary component, wherein:

[0006] The tensile testing machine is fixedly connected inside the shell, and the bolt clamp is clamped and fixed on the force-bearing end of the tensile testing machine;

[0007] The clamping screw is laterally passed through the bolt clamp and is rotatably arranged. The two ends of the clamping screw are provided with threads in opposite directions. The two ends of the clamping screw are respectively connected to a positioning block through the threads, so as to control the relative rotation of the clamping screw and the positioning block to control the approach and separation of the two positioning blocks;

[0008] The two positioning blocks are both L-shaped, and the bottom edges are slidably extended to the clamping space of the clamping screw, so that when the two positioning blocks are close to each other, the detection bolt can be clamped and fixed in the clamping space of the clamping screw;

[0009] The rotating component and the limiting component are arranged in the outer shell and are located in the clamping and feeding direction of the bolt clamp. The rotating component is used to screw together with the detection bolt, and the limiting component is used to limit the rotating component. The rotating component is provided with an auxiliary component, and the auxiliary component is used to control the screwing accuracy of the rotating component and the detection bolt.

[0010] Optionally, the rotating component includes a mounting frame, a lifting frame, a bolt detection sleeve, a rotating sleeve and a servo motor, wherein:

[0011] The mounting frame is fixedly connected in the housing, and the lifting frame is movably arranged on the mounting frame;

[0012] The lifting frame is provided with a placement slot, a bolt detection sleeve is placed in the placement slot of the lifting frame, and a thread matching with the detection bolt is arranged in the bolt detection sleeve;

[0013] The mounting frame is also rotatably connected to a rotating sleeve, and the rotating sleeve is coaxially transmission-connected with the bolt detection sleeve, and is slidably connected, so that the bolt detection sleeve maintains a rotation transmission connection with the rotating sleeve when following the lifting frame.

[0014] The servo motor is fixedly arranged in the housing, and the output shaft of the servo motor is transmission-connected with the rotating sleeve.

[0015] Optionally, an annular groove is provided on the outer wall of the bolt inspection sleeve, and the limiting component includes a clamping rod and a driving mechanism. The clamping rod is movably arranged on the lifting frame, and the driving mechanism is used to drive the movable head of the clamping rod to move to the annular groove to control the installation limit of the bolt inspection sleeve to the placement groove of the lifting frame.

[0016] Optionally, two of the clamping rods are symmetrically arranged relative to the placement slot of the lifting frame, and the driving mechanism of the limiting component includes an electric hydraulic cylinder, a limiting rod, a sleeve rod, a transmission rod, and a reset spring, wherein:

[0017] The two electric hydraulic cylinders are fixedly arranged in the housing, and the two electric hydraulic cylinders are symmetrically arranged relative to the placement slot of the lifting frame;

[0018] The telescopic rods of the two electric hydraulic cylinders are fixedly connected with limit rods, the two limit rods are fixedly connected with sleeve rods, the two sleeve rods are slidably connected with transmission rods, the two transmission rods are respectively transmission-connected with the two clamping rods, and a reset spring is also connected between the transmission rod and the corresponding sleeve rod.

[0019] Optionally,

[0020] The movable head of the clamping rod is arranged at the top end of the clamping rod and extends from the outer side to the inner side of the placement groove of the lifting frame. The movable head of the clamping rod is also slidably connected to the lifting frame, so as to control the movable head of the clamping rod to be clamped into the limiting state of the annular groove of the bolt detection sleeve by controlling the sliding of the movable head of the clamping rod;

[0021] The transmission rod is provided with a limiting hole, and the rod portion of the clamping rod can movably pass through the limiting hole of the transmission rod.

[0022] Optionally, the ends of the two limit rods are further extended to the side positions of the lifting frame and matched with the inclined surfaces of the lifting frame, so that when the limit rods are in contact with the corresponding inclined surfaces of the lifting frame, the lifting frame is controlled to stop lifting.

[0023] Optionally, the auxiliary components include a limit block, a pressure rod, a sliding column, a pressure plate and a pressure spring, wherein:

[0024] Two limit blocks are fixedly connected to the lifting frame, and the two limit blocks are symmetrically arranged relative to the lifting frame;

[0025] The two sleeve rods are both fixedly connected with a pressure rod, and the two pressure rods are respectively in contact with the two limit blocks, so as to control the lifting and limiting of the limit blocks by the pressure rods according to the movement of the sleeve rods.

[0026] Optionally,

[0027] The lifting frame is fixedly connected to two sliding columns, the two sliding columns are symmetrically arranged relative to the central axis of the lifting frame, the two sliding columns are slidably connected to a pressure plate, and a pressure spring is connected between the two pressure plates and the lifting frame;

[0028] The mounting frame is provided with two guide holes, the aperture of one end of the two guide holes close to the servo motor is smaller than the size of the pressure plate, and the slide column is embedded in the two guide holes on the mounting frame.

[0029] Optionally, a protective component is further included, the protective component is arranged in the housing, and the protective component is used to prevent the broken fragments of the detection bolt from splashing to the operating window of the housing, wherein:

[0030] The protective component includes a protective plate, a column gear and a gear rod. Two protective plates are rotatably connected in the outer shell. The two protective plates are symmetrically arranged. Both protective plates are fixedly connected with column gears. Two gear rods are slidably connected in the outer shell. The gear rods are fixedly connected to the corresponding transmission rods. The two column gears are meshed with the corresponding gear rods. During detection, the protective plates are driven to flip according to the movement of the transmission rod, so that the flipped protective plates can block the operating window of the outer shell.

[0031] Optionally, it also includes a top frame, a tension spring and a pull rod, wherein the top frame is slidably connected to the rotating sleeve, a tension spring is connected between the top frame and the rotating sleeve, the pull rod is fixedly connected to the top frame, and the pull rod and the shell are slidably connected.

[0032] Beneficial effects: 1. The movement of the sleeve rod will drive the transmission rod to move toward the limit block, and the movement of the transmission rod will drive the clamping rod to move toward the bolt inspection sleeve, so that the clamping rod will be stuck in the annular groove of the bolt inspection sleeve, and the rotation of the servo motor output shaft will drive the rotating sleeve to rotate, and the rotation of the rotating sleeve will drive the bolt inspection sleeve to rotate, so that the bolt inspection sleeve will be screwed together with the inspection bolt. In this way, the bolt inspection sleeve can be automatically screwed onto the inspection bolt, thereby improving the inspection efficiency, and through the servo motor control, it can be ensured that the bolt inspection sleeve is screwed on the bolt in the same position during each bolt inspection process, thereby improving the accuracy of the bolt tensile strength test data.

[0033] 2. The transmission rod will drive the gear rod to move, so that the gear rod and the column gear will mesh, and the column gear will rotate 180 degrees. The rotation of the column gear will drive the protective plate to rotate 180 degrees, so that the protective plate will block the detection bolt, thereby preventing fragments from splashing and injuring people after the bolt breaks, thereby improving the safety of the device.

[0034] 3. In the process of removing the ring bolt inspection sleeve, the user can pull the pull rod to make the pull rod extend out of the outer shell. The movement of the pull rod will drive the top frame to move in the direction close to the bolt inspection sleeve. The tension spring is stretched, and the top frame will hit the bolt inspection sleeve, so that the bolt inspection sleeve will extend out of the lifting frame placement slot, allowing the user to take the bolt inspection sleeve out of the lifting frame faster, thereby improving the inspection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0036] Figure 2 It is a schematic diagram of the cross-sectional three-dimensional structure of the housing of the present invention.

[0037] Figure 3 It is a three-dimensional structural schematic diagram of the housing and the tensile testing machine of the present invention.

[0038] Figure 4It is a three-dimensional structural schematic diagram of the bolt clamp, the clamping screw and the positioning block of the present invention.

[0039] Figure 5 It is a three-dimensional structural schematic diagram of the lifting frame, the mounting frame and the servo motor of the present invention.

[0040] Figure 6 It is a three-dimensional structural schematic diagram of the mounting frame, sliding column, pressure plate and pressure spring of the present invention.

[0041] Figure 7 It is a schematic diagram of a partially split three-dimensional structure of the present invention.

[0042] Figure 8 It is a schematic diagram of the three-dimensional structure of the electric hydraulic cylinder, the limit rod and the protective plate of the present invention.

[0043] Fig. 9 It is a three-dimensional structural schematic diagram of the sleeve rod, the transmission rod and the return spring of the present invention.

[0044] Fig.10 It is a schematic diagram of the three-dimensional structure of the limit block and the pressure rod of the present invention.

[0045] Fig.11 It is a schematic diagram of the three-dimensional structure of the protective plate, column gear, gear rod and transmission rod of the present invention.

[0046] Fig.12 It is a schematic diagram of the disassembled three-dimensional structure of the limiting component of the present invention.

[0047] Fig.13 It is a schematic diagram of the three-dimensional structure of the rotating sleeve and the pull rod of the present invention.

[0048] Fig.14 It is a schematic diagram of the three-dimensional structure of the pull rod and the top frame of the present invention.

[0049] Marked in the figure: 1-housing, 2-tensile testing machine, 3-bolt clamp, 4-locking rod, 5-clamping screw, 51-positioning block, 6-detection bolt, 71-mounting frame, 72-lifting frame, 73-bolt detection sleeve, 74-rotating sleeve, 75-servo motor, 81-electric hydraulic cylinder, 82-limit rod, 83-sleeve rod, 84-transmission rod, 85-reset spring, 86-clamp rod, 91-limit block, 92-pressure rod, 93-sliding column, 94-pressure plate, 95-pressure spring, 101-protective plate, 102-column gear, 103-tooth rod, 12-top frame, 13-tension spring, 14-pull rod. DETAILED DESCRIPTION

[0050] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention.

[0051] Embodiment 1: A bolt strength testing device, such as Figure 1-Figure 14 As shown, it includes a shell 1, a tensile testing machine 2, a bolt fixture 3, a locking rod 4, a clamping screw 5, a positioning block 51, a detection bolt 6, a rotating component, a limiting component and an auxiliary component. The tensile testing machine 2 is fixedly connected to the shell 1, the bolt fixture 3 is clamped on the tensile testing machine 2, the locking rod 4 is connected between the bolt fixture 3 and the tensile testing machine 2, the clamping screw 5 is rotatably connected to the bolt fixture 3, two threads in opposite directions are provided on the clamping screw 5, two positioning blocks 51 are threadedly connected to the clamping screw 5, the two positioning blocks 51 are respectively screwed with the two reverse threads on the clamping screw 5, the two positioning blocks 51 are slidably connected to the bolt fixture 3, a detection bolt 6 is placed on the bolt fixture 3, a rotating component and a limiting component are provided in the shell 1, the rotating component is used to screw with the detection bolt 6, the limiting component is used to limit the rotating component, and the rotating component is provided with an auxiliary component, the auxiliary component is used to assist the rotating component and the detection bolt 6 to be screwed more accurately.

[0052] The clamping space provided at the lower end of the bolt clamp 3 is a T-shaped structure, which can be used to detect the pre-positioning of the nut of the bolt 6 and facilitate feeding.

[0053] The rotating component includes a mounting frame 71, a lifting frame 72, a bolt detection sleeve 73, a rotating sleeve 74 and a servo motor 75. The mounting frame 71 is fixedly connected in the outer shell 1, and the lifting frame 72 is slidably connected in the outer shell 1. The lifting frame 72 is provided with a placement groove, and a bolt detection sleeve 73 is placed in the placement groove of the lifting frame 72. The bolt detection sleeve 73 is used to be screwed with the detection bolt 6. The rotating sleeve 74 is rotatably connected to the mounting frame 71, and the servo motor 75 is fixedly connected in the outer shell 1. The output shaft of the servo motor 75 and the rotating sleeve 74 are fixedly connected.

[0054] The bolt detection sleeve 73 is provided with threads matching with the detection bolt 6 , and detection bolts 6 of different specifications are equipped with matching bolt detection sleeves 73 .

[0055] The limiting component includes an electric hydraulic cylinder 81, a limiting rod 82, a sleeve rod 83, a transmission rod 84, a reset spring 85 and a clamping rod 86. Two electric hydraulic cylinders 81 are fixedly connected in the housing 1. The two electric hydraulic cylinders 81 are symmetrically arranged. The limiting rods 82 are fixedly connected to the telescopic rods of the two electric hydraulic cylinders 81. The limiting rods 82 are used to limit the lifting frame 72. The two limiting rods 82 are fixedly connected with the sleeve rod 83. The two sleeve rods 83 are slidably connected with the transmission rod 84. The two transmission rods 84 have limiting holes. A reset spring 85 is connected between the transmission rod 84 and the sleeve rod 83. Two clamping rods 86 are slidably connected to the lifting frame 72. The two clamping rods 86 pass through the limiting holes on the two transmission rods 84 respectively.

[0056] An annular groove is provided on the bolt detection sleeve 73 , and both the two clamping rods 86 can extend into the annular groove of the detection bolt 6 sleeve. When the clamping rods 86 extend into the annular groove of the detection bolt 6 sleeve, the detection bolt 6 will be restricted on the lifting frame 72 .

[0057] The ends of the two limit rods 82 away from the electric hydraulic cylinder 81 are both provided with a 45-degree inclined surface, and the lifting frame 72 is also provided with two 45-degree inclined surfaces.

[0058] The auxiliary components include a limit block 91, a pressure rod 92, a sliding column 93, a pressure plate 94 and a pressure spring 95. Two limit blocks 91 are fixedly connected to the lifting frame 72, and the two limit blocks 91 are symmetrically arranged. The two sleeve rods 83 are fixedly connected with pressure rods 92, and the two pressure rods 92 are respectively in contact with the two limit blocks 91. The pressure rod 92 is used to squeeze the limit blocks 91. Two sliding columns 93 are fixedly connected to the lifting frame 72, and the two sliding columns 93 are symmetrically arranged. Pressure plates 94 are slidably connected to the two sliding columns 93, and pressure springs 95 are connected between the two pressure plates 94 and the lifting frame 72.

[0059] The mounting frame 71 is provided with two guide holes. The diameter of one end of the two guide holes close to the servo motor 75 is smaller than the diameter of the pressing plate 94 , so that the pressing plate 94 will be restricted by the mounting frame 71 .

[0060] Initially, the pressure rod 92 squeezes the limit block 91, the lifting frame 72 extends into the housing 1, the pressure plate 94 is limited by the mounting frame 71, the pressure spring 95 is compressed, and the user places the bolt detection sleeve 73 that matches the detection bolt 6 in the placement groove of the lifting frame 72. Subsequently, the user moves the slide bar of the tensile testing machine 2 to a suitable position, and then the user installs the bolt clamp 3 on the tensile testing machine 2 and fixes it through the locking rod 4. After the bolt clamp 3 is installed, the user places the detection bolt 6 on the bolt clamp 3, and the user rotates the clamping screw 5 so that the two positioning blocks 51 move toward each other, thereby fixing the detection bolt 6 so that the detection bolt 6 is located directly above the bolt detection sleeve 73. The positioning block 51 is an L-shaped structure, and the bottom edge passes through the bolt clamp 3.

[0061] After the inspection bolt 6 is fixed, the user controls the telescopic rod of the electric hydraulic cylinder 81 to retract, and the retraction of the telescopic rod of the electric hydraulic cylinder 81 drives the sleeve rod 83 and the pressure rod 92 to move together. The movement of the sleeve rod 83 drives the transmission rod 84 to move toward the direction close to the limit block 91, and the movement of the transmission rod 84 drives the clamping rod 86 to move toward the direction close to the bolt inspection sleeve 73, so that the clamping rod 86 will be stuck in the annular groove of the bolt inspection sleeve 73.

[0062] The telescopic rod of the electric hydraulic cylinder 81 continues to retract, and the sleeve rod 83 and the pressure rod 92 continue to move, so that the transmission rod 84 will extend into the sleeve rod 83, the reset spring 85 is compressed, and the pressure rod 92 will gradually move and disengage from the limit block 91. After the pressure rod 92 and the limit block 91 fall off, the lifting frame 72 is no longer limited, and the pressure spring 95 resets to drive the lifting frame 72 to extend out of the partition platform in the shell 1. The movement of the lifting frame 72 drives the bolt detection sleeve 73 to move together, so that the threaded mouth of the bolt detection sleeve 73 will fit with the detection bolt 6, and the telescopic rod of the electric hydraulic cylinder 81 stops moving. Subsequently, the user starts the servo motor 75. The user can set the number of turns of the bolt detection sleeve 73 and the detection bolt 6 by setting the number of turns of the servo motor 75, thereby improving the accuracy of the data of the bolt strength detection.

[0063] The output shaft of the servo motor 75 rotates to drive the rotating sleeve 74 to rotate, and the rotating sleeve 74 rotates to drive the bolt detection sleeve 73 to rotate, so that the bolt detection sleeve 73 and the detection bolt 6 are screwed together, and the bolt detection sleeve 73 will extend out of the rotating sleeve 74, and the bolt detection sleeve 73 drives the lifting frame 72 to further extend out of the housing 1. After the output shaft of the servo motor 75 rotates a certain number of times, the user turns off the servo motor 75. Then, the user controls the telescopic rod of the electric hydraulic cylinder 81 to further retract, and the telescopic rod of the electric hydraulic cylinder 81 drives the limit rod 82 to move in the direction close to the lifting frame 72. After the inclined surface of the limit rod 82 and the inclined surface of the lifting frame 72 are in contact, the telescopic rod of the electric hydraulic cylinder 81 stops moving, and the lifting frame 72 is restricted by the limit rod 82. Subsequently, the user controls the tensile testing machine 2 to work, and the tensile testing machine 2 will apply tension to the bolt clamp 3, so that the bolt clamp 3 will drive the detection bolt 6 to be pulled in the direction away from the bolt detection sleeve 73, and because the clamping rod 86 pulls the bolt detection The sleeve 73 is restricted on the lifting frame 72, and the lifting frame 72 is restricted by the limit rod 82, so that the bolt detection sleeve 73 cannot move. As the tension of the tensile testing machine 2 increases, the detection bolt 6 is continuously pulled. After the detection bolt 6 is broken, the tensile testing machine 2 detects that the bolt clamp 3 has moved, and the tensile testing machine 2 stops working to complete the tensile strength test of the detection bolt 6. After the detection bolt 6 is broken, the lifting frame 72 will re-extend into the housing 1 under the action of gravity, and then the user controls the telescopic rod of the electric hydraulic cylinder 81 to extend and reset, and the electric hydraulic cylinder The telescopic rod 81 will drive the limit rod 82, the pressure rod 92, the sleeve rod 83 and the transmission rod 84 to reset. The reset of the transmission rod 84 drives the clamping rod 86 to disengage the annular groove of the bolt detection sleeve 73, and the bolt detection sleeve 73 is no longer limited. The reset of the pressure rod 92 will squeeze the limit block 91 again. The limit block 91 is squeezed and drives the lifting frame 72 to further extend into the housing 1 to reset. The pressure plate 94 is restricted by the mounting frame 71, and the pressure spring 95 is compressed again. Then, the user rotates the clamping screw 5 in the opposite direction to reset the two positioning blocks 51, and the user removes the broken bolt head. The user takes out the bolt inspection sleeve 73 embedded with the broken part of the bolt from the placement slot of the lifting frame 72 and replaces it with the bolt inspection sleeve 73 of the same type to complete a bolt tensile strength test. The bolt can be tested quickly in this way. In this way, the bolt inspection sleeve 73 can be automatically screwed onto the inspection bolt 6 sleeve, which is easy to operate and improves the inspection efficiency. The servo motor 75 control can ensure that the bolt inspection sleeve 73 is screwed on the bolt at the same position during each bolt inspection process, thereby improving the accuracy of the bolt tensile strength test data.

[0064] Embodiment 2: Based on embodiment 1, Figure 8-Figure 14As shown, a protective component is also included. The protective component is arranged in the outer shell 1. The protective component is used to prevent the broken fragments of the detection bolt 6 from splashing and injuring people. The protective component includes a protective plate 101, a column gear 102 and a gear rod 103. Two protective plates 101 are rotatably connected in the outer shell 1. The protective plates 101 are used to prevent the broken fragments of the detection bolt 6 from splashing and injuring people. The two protective plates 101 are symmetrically arranged. The column gears 102 are fixedly connected to the two protective plates 101. A gear rod 103 is slidably connected in the outer shell 1. The gear rod 103 is fixedly connected to one of the transmission rods 84, and the two column gears 102 are meshed with the gear rod 103.

[0065] It also includes a top frame 12, a tension spring 13 and a pull rod 14. The top frame 12 is slidably connected to the rotating sleeve 74. The top frame 12 is used to push the bolt detection sleeve 73 out of the lifting frame 72. The tension spring 13 is connected between the top frame 12 and the rotating sleeve 74. The pull rod 14 is fixedly connected to the top frame 12. The pull rod 14 and the outer shell 1 are slidably connected.

[0066] In the process that the transmission rod 84 drives the clamping rod 86 to extend into the annular groove of the screw detection sleeve, the transmission rod 84 will drive the gear rod 103 to move, so that the gear rod 103 and the column gear 102 will mesh, and the column gear 102 will rotate 180 degrees. The rotation of the column gear 102 drives the protective plate 101 to rotate 180 degrees, so that the protective plate 101 will block the detection bolt 6, thereby preventing the fragments from splashing and injuring people after the bolt breaks. The transmission rod 84 resets and drives the gear rod 103 to reset. The gear rod 103 resets and drives the column gear 102 to reset. The column gear 102 resets and drives the protective plate 101 Reset. In the process of removing the ring bolt inspection sleeve 73, the user can pull the pull rod 14 to make the pull rod 14 extend out of the outer shell 1. The movement of the pull rod 14 will drive the top frame 12 to move toward the direction close to the bolt inspection sleeve 73. The tension spring 13 is stretched, and the top frame 12 will hit the bolt inspection sleeve 73, so that the bolt inspection sleeve 73 will extend out of the placement slot of the lifting frame 72, allowing the user to take the bolt inspection sleeve 73 out of the lifting frame 72 more quickly, thereby improving the inspection efficiency. The user releases the pull rod 14, and the tension spring 13 resets to drive the top frame 12 and the pull rod 14 to reset.

[0067] The above-mentioned embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person skilled in the art, several modifications, improvements and substitutions can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A bolt strength testing device, characterized in that: The invention comprises a housing (1), a tensile testing machine (2), a bolt clamp (3), a locking rod (4), a clamping screw (5), a positioning block (51), a detection bolt (6), a rotating component, a limiting component and auxiliary components, wherein: The tensile testing machine (2) is fixedly connected inside the housing (1), and the bolt clamp (3) is clamped and fixed on the force-bearing end of the tensile testing machine (2); The clamping screw (5) is arranged to penetrate the bolt clamp (3) transversely and is arranged to be rotatable. The two ends of the clamping screw (5) are provided with threads in opposite directions. The two ends of the clamping screw (5) are respectively connected to a positioning block (51) through the threads, so that the relative rotation of the clamping screw (5) and the positioning block (51) is controlled to control the approach and separation of the two positioning blocks (51); The two positioning blocks (51) are both L-shaped structures, and the bottom edges are slidably extended to be arranged in the clamping space of the clamping screw (5), so that when the two positioning blocks (51) are close to each other, the detection bolt (6) can be clamped and fixed in the clamping space of the clamping screw (5); The rotating component and the limiting component are arranged in the housing (1) and are located in the clamping and feeding direction of the bolt clamp (3); the rotating component is used to screw together with the detection bolt (6); the limiting component is used to limit the rotating component; an auxiliary component is provided on the rotating component, and the auxiliary component is used to control the screwing accuracy of the rotating component and the detection bolt (6).

2. A bolt strength testing device according to claim 1, characterized in that: The rotating component comprises a mounting frame (71), a lifting frame (72), a bolt detection sleeve (73), a rotating sleeve (74) and a servo motor (75), wherein: The mounting frame (71) is fixedly connected inside the housing (1), and the lifting frame (72) is movably arranged on the mounting frame (71) in a lifting manner; The lifting frame (72) is provided with a placement groove, a bolt detection sleeve (73) is placed in the placement groove of the lifting frame (72), and a thread matching with the detection bolt (6) is arranged in the bolt detection sleeve (73); The mounting frame (71) is also rotatably connected to a rotating sleeve (74), and the rotating sleeve (74) is coaxially transmission-connected with the bolt detection sleeve (73) and is slidably connected so that the bolt detection sleeve (73) maintains a rotation transmission connection with the rotating sleeve (74) when following the lifting frame (72) to rise and fall; The servo motor (75) is fixedly arranged in the housing (1), and the output shaft of the servo motor (75) is transmission-connected to the rotating sleeve (74).

3. A bolt strength testing device according to claim 2, characterized in that: An annular groove is provided on the outer side wall of the bolt detection sleeve (73), and the limiting component comprises a clamping rod (86) and a driving mechanism. The clamping rod (86) is movably arranged on the lifting frame (72), and the driving mechanism is used to drive the movable head of the clamping rod (86) to move to the annular groove, so as to control the installation limit of the bolt detection sleeve (73) to the placement groove of the lifting frame (72).

4. A bolt strength testing device according to claim 3, characterized in that: Two of the clamping rods (86) are symmetrically arranged relative to the placement slot of the lifting frame (72); the driving mechanism of the limiting component comprises an electric hydraulic cylinder (81), a limiting rod (82), a sleeve rod (83), a transmission rod (84), and a return spring (85), wherein: The two electric hydraulic cylinders (81) are fixedly arranged in the housing (1), and the two electric hydraulic cylinders (81) are symmetrically arranged relative to the placement groove of the lifting frame (72); The telescopic rods of the two electric hydraulic cylinders (81) are both fixedly connected with limit rods (82), the two limit rods (82) are both fixedly connected with sleeve rods (83), the two sleeve rods (83) are both slidably connected with transmission rods (84), the two transmission rods (84) are respectively transmission-connected with the two clamping rods (86), and a return spring (85) is also connected between the transmission rod (84) and the corresponding sleeve rod (83).

5. A bolt strength testing device according to claim 4, characterized in that: The movable head of the clamping rod (86) is arranged at the top end of the clamping rod (86) and extends from the outer side to the inner side of the placement groove of the lifting frame (72). The movable head of the clamping rod (86) is also slidably connected to the lifting frame (72) so as to control the sliding of the movable head of the clamping rod (86) to control the limit state of the movable head of the clamping rod (86) being clamped into the annular groove of the bolt detection sleeve (73); The transmission rod (84) is provided with a limiting hole, and the rod portion of the clamping rod (86) can be movably passed through the limiting hole of the transmission rod (84).

6. A bolt strength testing device according to claim 4, characterized in that: The ends of the two limit rods (82) are also extended to the side positions of the lifting frame (72) and matched with the inclined surfaces of the lifting frame (72) so as to control the lifting frame (72) to stop lifting when the limit rods (82) are in contact with the corresponding inclined surfaces of the lifting frame (72).

7. A bolt strength testing device according to claim 4, characterized in that: The auxiliary components include a limit block (91), a pressure rod (92), a sliding column (93), a pressure plate (94) and a pressure spring (95), wherein: Two limit blocks (91) are fixedly connected to the lifting frame (72), and the two limit blocks (91) are symmetrically arranged relative to the lifting frame (72); The two sleeve rods (83) are both fixedly connected with a pressure rod (92), and the two pressure rods (92) are respectively in contact with the two limit blocks (91) so as to control the lifting and limiting of the limit blocks (91) by the pressure rods (92) according to the movement of the sleeve rods (83).

8. A bolt strength testing device according to claim 7, characterized in that: Two sliding columns (93) are fixedly connected to the lifting frame (72), and the two sliding columns (93) are symmetrically arranged relative to the central axis of the lifting frame (72). The two sliding columns (93) are slidably connected to a pressure plate (94), and a pressure spring (95) is connected between the two pressure plates (94) and the lifting frame (72); The mounting frame (71) has two guide holes, and the diameter of one end of the two guide holes close to the servo motor (75) is smaller than the size of the pressure plate (94). The slide column (93) is embedded in the two guide holes on the mounting frame (71).

9. A bolt strength testing device according to claim 7, characterized in that: It also includes a protective component, which is arranged in the housing (1) and is used to prevent broken fragments of the detection bolt (6) from splashing onto the operating window of the housing (1), wherein: The protective component comprises a protective plate (101), a column gear (102) and a gear rod (103); two protective plates (101) are rotatably connected in the housing (1); the two protective plates (101) are symmetrically arranged; the two protective plates (101) are fixedly connected to the column gear (102); two gear rods (103) are slidably connected in the housing (1); the gear rods (103) are fixedly connected to the corresponding transmission rods (84); the two column gears (102) are meshed with the corresponding gear rods (103); during detection, the protective plates (101) are driven to flip according to the movement of the transmission rod (84), so that the flipped protective plates (101) can block the operation window of the housing (1).

10. A bolt strength testing device according to claim 9, characterized in that: It also includes a top frame (12), a tension spring (13) and a pull rod (14), wherein the top frame (12) is slidably connected to the rotating sleeve (74), a tension spring (13) is connected between the top frame (12) and the rotating sleeve (74), the pull rod (14) is fixedly connected to the top frame (12), and the pull rod (14) and the outer shell (1) are slidably connected.

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