A screw assembly torque testing device

Abstract

The present application relates to a screw assembly torque test device, including a test base, a nut adapter is detachably provided on the test base, a pre-tightening groove is provided on the side wall of the test base away from the installation side of the nut adapter, the depth of the pre-tightening groove is not more than 0.2 times the height of the screw head, and the bottom wall of the pre-tightening groove is a pre-tightening plane; a tightening torque measuring mechanism, including a torque wrench and a quick tightening wrench that can move toward or away from the pre-tightening groove and can be interchanged in front and back positions, and both wrenches can be rotated around the screw axis for tightening the screw; a positioning auxiliary testing mechanism, which cooperates with the tightening torque measuring mechanism to realize dual data detection of the screw torque; a control panel, which is electrically connected to the tightening torque measuring mechanism and the positioning auxiliary testing mechanism to realize device driving and measurement value display. The present application has the effect of improving the test accuracy and efficiency of static assembly torque of threaded fasteners such as screws, and meets the testing requirements of most threaded fasteners.

Description

Technical Field

[0001] The present application relates to the field of testing equipment, and in particular to a screw assembly torque testing device. Background Art

[0002] Threaded fasteners are mechanical parts used in almost all mechanical equipment. The performance of threaded fasteners is one of the most important technologies affecting the reliability of mechanical connection technology. In order to avoid over-tightening, under-tightening and under-tightening of threaded fasteners during and after tightening, and to ensure that each threaded fastener can work normally after tightening, it is necessary to test the static assembly torque (hereinafter referred to as static torque) of threaded fasteners.

[0003] At present, in order to save costs and meet the needs of on-the-spot testing, most manufacturers still use manual inspection, that is, the staff chooses the conventional loosening method or marking method to use a torque wrench to assist in static torque testing. However, manual inspection usually has low test accuracy, is greatly affected by the experience and skills of the inspectors, and is not efficient. There are also many torque testing machines on the market, but most of them can only perform inspections on one process, that is, the test results only correspond to the test standards of the machine, and the accuracy is insufficient. Moreover, such machines can usually only detect one or a few types of bolts, and the inspection range is small.

[0004] Therefore, there is an urgent need in the art for a testing device with high detection efficiency, high accuracy and adaptability to most types of threaded fasteners. Summary of the invention

[0005] In order to improve the testing accuracy and efficiency of static assembly torque of threaded fasteners such as screws and meet the testing requirements of most threaded fasteners, the present application provides a screw assembly torque testing device.

[0006] The present application provides a screw assembly torque testing device that adopts the following technical solution:

[0007] A screw assembly torque testing device, comprising:

[0008] The test base is an integrated base of the entire device. The test base is detachably provided with a nut adapter. A pre-tightening groove is provided on the side wall of the test base away from the installation side of the nut adapter. The depth of the pre-tightening groove is not greater than 0.2 times the height of the screw head. The bottom wall of the pre-tightening groove is a pre-tightening plane. The screw passes through the pre-tightening groove and is threadedly connected to the nut adapter.

[0009] The tightening torque measuring mechanism includes a torque wrench and a quick tightening wrench. The torque wrench and the quick tightening wrench can both move toward or away from the pre-tightening groove, and the front and rear positions of the torque wrench and the quick tightening wrench are interchangeable. The torque wrench and the quick tightening wrench can both rotate around the screw axis for tightening the screw. The torque wrench can read the torque value of the wrench. A driving mechanism for driving the torque wrench and the quick tightening wrench to move and rotate is provided on the test base.

[0010] A positioning auxiliary test mechanism is used to monitor each detection position of the screw, and cooperates with the tightening torque measurement mechanism to realize dual data detection of the screw torque;

[0011] The control panel is electrically connected to the tightening torque measuring mechanism and the positioning auxiliary testing mechanism to realize device driving and measurement value display.

[0012] Preferably, the driving mechanism includes a linear motor 1, a mounting seat, a first transmission tube, a rodless cylinder, a second transmission tube and a power assembly, the first transmission tube and the second transmission tube are both cylindrical tubes, the linear motor 1 is arranged on the test base and the slider slides toward or close to the pre-tightening groove, the mounting seat is arranged on the slider of the linear motor 1, the first transmission tube is reciprocatingly mounted on the mounting seat, the quick-tightening wrench is detachably arranged on the outer wall of one end of the first transmission tube close to the pre-tightening groove, the rodless cylinder is arranged on the mounting seat and is located at the end of the first transmission tube away from the pre-tightening groove, the second transmission tube is rotatably mounted on the rodless cylinder slider and coaxially penetrates the first transmission tube, the end of the second transmission tube close to the pre-tightening groove can extend out of or into the first transmission tube, the torque wrench is detachably arranged on the outer wall of the second transmission tube and can move with the second transmission tube within the front and rear range of the quick-tightening wrench, and the power assembly cooperates with the positioning auxiliary test mechanism to respectively drive the first transmission tube and the second transmission tube to rotate.

[0013] Furthermore, the power assembly includes a reciprocating motor, a driving gear 1, a driving gear 2, a driven gear 1 and a driven gear 2, the reciprocating motor is arranged on the mounting seat, the driving gear 1 and the driving gear 2 are spaced and fixed on the output shaft of the reciprocating motor, the driven gear 1 is fixedly sleeved on the outer wall of the first transmission tube and can move with the linear motor 1 slider to engage with the driving gear 1, the driven gear 2 is fixedly sleeved on the outer wall of the second transmission tube and can move with the rodless cylinder slider to engage with the driving gear 2, and the driving gear 1 and the driving gear 2 are not engaged at the same time.

[0014] Furthermore, when the torque wrench is located on the side of the quick-tightening wrench away from the pre-tightening groove, the torque wrench is located on the side wall of the second transmission tube away from the quick-tightening wrench; when the torque wrench is located on the side of the quick-tightening wrench close to the pre-tightening groove, the torque wrench is located on the side wall of the second transmission tube facing the quick-tightening wrench, and a slide groove is provided on the side wall of the first transmission tube away from the quick-tightening wrench, and a rotating groove is opened around the axial direction of the first transmission tube at one end of the slide groove close to the pre-tightening groove.

[0015] Furthermore, the positioning auxiliary testing mechanism includes a distance measuring sensor, an infrared sensor, an infrared ink ejector and a rotating micro-reaction sensing component. The distance measuring sensor is arranged on the side wall of the pre-tightening plane to sense the distance between the pre-tightening plane and the locking end face of the screw head. The infrared ink ejector is connected to the distance measuring sensor signal, the infrared sensor is connected to the reciprocating motor signal, and the rotating micro-reaction sensing component is slidably arranged on the inner wall of the pre-tightening groove in the direction of approaching or moving away from the screw to sense the slight rotation of the screw head.

[0016] Furthermore, the rotating micro-reaction sensing element is a contact displacement sensor, and the rotating micro-reaction sensing element is connected to the rodless cylinder and the reciprocating motor signal.

[0017] Furthermore, the infrared ink injector is rotatably arranged on the inner wall of the pre-tightening groove and is located on the side of the infrared sensor close to the opening of the pre-tightening groove. The infrared ink injector is initially inclined and the intersection of the straight line where the injection direction is located and the screw head is located between the infrared sensor and the pre-tightening plane. The infrared ink injector rotates toward the opening side of the pre-tightening groove while injecting.

[0018] Furthermore, the maximum rotation angle of the infrared ink ejector is that the straight line where the ejection direction of the infrared ink ejector is located is perpendicular to the axis of the screw.

[0019] Furthermore, the quick-tightening wrench is detachably provided with an adapter that is compatible with the screw.

[0020] Furthermore, the reciprocating motor is a variable frequency motor.

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

[0022] 1. When the present invention is used, torque testing of screws of various thread types can be achieved through the test base and the nut adapter detachably mounted on the test base, which greatly improves the test range of the test device.

[0023] 2. When the present invention is used, the power component in the driving mechanism drives the quick-tightening wrench to realize the rapid pre-tightening assembly of the screw and the pre-tightening plane and cooperates with the infrared ink ejector to quickly mark the screw. After marking, the quick-tightening wrench loosens the screw by a certain angle and then switches to the torque wrench to assemble and tighten the screw. The infrared sensor and the infrared ink sensing setting cooperate with the frequency conversion motor to drive the torque wrench to tighten the screw, so that the screw can be accurately tightened to the marked position, thereby realizing the first test, which is convenient and quick.

[0024] 3. When the present invention is used, after the screw is tightened for the first time by the torque wrench, the control panel records the torque value, and then the micro-reaction sensing element is rotated to start sliding until the contact head abuts against the side wall of the screw head. At this time, the reciprocating motor drives the torque wrench to rotate again. When the screw head rotates slightly, the rotating micro-reaction sensing element contact head senses the motion and controls the reciprocating motor to stop moving. The torque wrench records the torque value again, realizing the second test, thereby ensuring the accuracy of the torque test.

[0025] 4. When the present invention is used, the torque of the quick-tightening wrench and the torque wrench remains constant and is not affected by external factors, which greatly ensures the consistency of the test data of each screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The embodiment of the present invention mainly embodies the overall structure of a screw assembly torque test device. Figure 1 ;

[0027] Figure 2 The embodiment of the present invention mainly embodies the overall structure of a screw assembly torque test device. Figure 2 ;

[0028] Figure 3 This is a cross-sectional schematic diagram of the structure of the positioning auxiliary test mechanism mainly embodied in an embodiment of the present invention;

[0029] Figure 4 for Figure 3 The enlarged schematic diagram of the middle A part;

[0030] Figure 5 The present invention mainly embodies a structural schematic diagram of a torque wrench in a screw assembly torque testing device in a working state.

[0031] Reference numerals: 1, test base; 11, preload groove; 111, preload plane; 112, connecting hole; 2, tightening torque measuring mechanism; 21, torque wrench; 22, quick tightening wrench; 221, sleeve; 222, adapter; 3, driving mechanism; 31, linear motor 1; 32, mounting seat; 33, first transmission pipe; 331, slide groove; 332, rotating groove; 34, rodless cylinder; 35, second transmission pipe; 36, power assembly; 361 , reciprocating motor; 362, driving gear one; 363, driving gear two; 364, driven gear one; 365, driven gear two; 4, rotating frame one; 5, rotating frame two; 6, positioning auxiliary test mechanism; 61, distance measuring sensor; 62, infrared sensor; 63, infrared ink ejector; 64, rotating micro-reaction sensing element; 7, micro motor; 8, driving electric cylinder; 9, nut adapter; 10, control panel; 12, linear motor two. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme of the embodiment of the present application will be clearly and completely described in conjunction with the drawings of the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, not all of the embodiments. Based on the described embodiment of the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application.

[0033] Unless otherwise defined, the technical terms or scientific terms used herein shall have the common meanings understood by persons with ordinary skills in the field to which this application belongs. The words "one" or "an" and the like used in the patent application specification and claims of this application do not indicate a quantity limitation, but indicate the existence of at least one.

[0034] The following is combined with Figure 1-5 This application is described in further detail.

[0035] Reference Figure 1-Figure 5 A screw assembly torque testing device comprises a test base 1, a tightening torque measuring mechanism 2, a positioning auxiliary testing mechanism 6 and a control panel 10. The tightening torque measuring mechanism 2, the positioning auxiliary testing mechanism 6 and the control panel 10 are all installed on the test base 1. The positioning auxiliary testing mechanism 6 is used to monitor various detection positions of the screw, and cooperates with the tightening torque measuring mechanism 2 to realize dual data detection of the screw torque. The control panel 10 is electrically connected to the tightening torque measuring mechanism 2 and the positioning auxiliary testing mechanism 6 to realize device drive detection and measurement value display.

[0036] A nut adapter 9 is detachably mounted on the test base 1 by bolts, and a pre-tightening groove 11 is provided on the side wall of the test base 1 facing away from the installation side of the nut adapter 9. The depth of the pre-tightening groove 11 is not more than 0.2 times the height of the screw head, so as to facilitate the installation and adaptation of the positioning auxiliary test mechanism 6 without affecting the twisting of the screw. The inner bottom wall of the pre-tightening groove 11 is a pre-tightening plane 111, and a connecting hole 112 is provided on the pre-tightening plane 111, which is coaxially arranged with the nut adapter 9 and interconnected. The diameter of the connecting hole 112 is larger than the diameter of all the screws to be tested. The screw passes through the pre-tightening groove 11 and is threadedly connected to the nut adapter 9 until the head end face is tightened in fits with the pre-tightening plane 111.

[0037] Reference Figure 1-Figure 5 The tightening torque measuring mechanism 2 includes a torque wrench 21 and a quick tightening wrench 22. The quick tightening wrench 22 is a conventional screw wrench and is plugged and fixed with an adapter 222 to adapt to different screw heads. The torque wrench 21 can be a dial type, a digital display type or a fixed value type. In this embodiment, the torque wrench 21 is preferably a digital display type and is electrically connected to the control panel 10 to realize the transmission of measurement data. The torque wrench 21 and the quick tightening wrench 22 can both move toward or away from the pre-tightening groove 11, and the front and rear positions of the torque wrench 21 and the quick tightening wrench 22 are interchangeable. The torque wrench 21 and the quick tightening wrench 22 can both rotate around the screw axis for tightening the screw. The quick tightening wrench 22 is used for fast tightening of the screw and loosening before testing. The torque wrench 21 is used for fixed range screwing of the screw and assembly torque measurement. The test base 1 is equipped with a driving mechanism 3 for driving the torque wrench 21 and the quick tightening wrench 22 to move and rotate.

[0038] The driving mechanism 3 includes a linear motor 31, a mounting seat 32, a first transmission tube 33, a rodless cylinder 34, a second transmission tube 35 and a power assembly 36. The first transmission tube 33 and the second transmission tube 35 are both cylindrical tubes. The linear motor 31 is mounted on the test base 1 and the slider slides toward or close to the pre-tightening groove 11. The mounting seat 32 is fixedly mounted on the slider of the linear motor 31 by bolts. The first transmission tube 33 is reciprocatingly mounted on the mounting seat 32 through a rotating frame 4 and a bearing member. The end of the quick-tightening wrench 22 away from the head is welded and fixed with a sleeve 221 that is sleeved with the outer wall of one end of the first transmission tube 33 close to the pre-tightening groove 11. The middle part of the quick-tightening wrench 22 is a connecting rod structure for ensuring the rotation operation during the tightening operation. The sleeve 221 is coaxially arranged with the connecting hole 112, and the sleeve 221 and the first transmission tube 33 are locked and fixed by bolts;

[0039] The rodless cylinder 34 is installed on the mounting seat 32 and is located at the end of the first transmission tube 33 away from the pre-tightening groove 11. The second transmission tube 35 is rotatably mounted on the slider of the rodless cylinder 34 through the rotating frame 25 and the bearing member and coaxially penetrates the first transmission tube 33. The end of the second transmission tube 35 close to the pre-tightening groove 11 can extend out or extend into the first transmission tube 33. The torque wrench 21 is plugged and installed on the outer wall of the second transmission tube 35 and locked by bolts. The middle part of the torque wrench 21 is a connecting rod structure for ensuring the rotation operation during tightening operation, and the torque wrench 21 can move with the second transmission tube 35 within the front and rear sides of the quick-tightening wrench 22. The connecting head end of the torque wrench 21 is coaxially opposite to the screw. The power component 36 cooperates with the positioning auxiliary test mechanism 6 to drive the first transmission tube 33 and the second transmission tube 35 to rotate respectively.

[0040] Furthermore, the power assembly 36 includes a reciprocating motor 361, a driving gear 1 362, a driving gear 2 363, a driven gear 1 364 and a driven gear 2 365. The reciprocating motor 361 adopts a variable frequency motor. The reciprocating motor 361 is slidably mounted on the test base 1 through the linear motor 2 12. The driving gear 1 362 and the driving gear 2 363 are fixed on the output shaft of the reciprocating motor 361 at intervals. The driven gear 1 364 is fixedly mounted on the outer wall of the first transmission tube 33 and can move with the slider of the linear motor 1 31 to engage with the driving gear 1 362. The driven gear 2 365 is fixedly mounted on the outer wall of the second transmission tube 35 and can move with the slider of the rodless cylinder 34 to engage with the driving gear 2 363, and the driving gear 1 362 and the driving gear 2 363 are not engaged at the same time.

[0041] Furthermore, when the torque wrench 21 is located on the side of the quick-tightening wrench 22 away from the pre-tightening groove 11, the torque wrench 21 is located on the side wall of the second transmission tube 35 away from the quick-tightening wrench 22; when the torque wrench 21 is located on the side of the quick-tightening wrench 22 close to the pre-tightening groove 11, the torque wrench 21 is located on the side wall of the second transmission tube 35 facing the quick-tightening wrench 22, and a slide groove 331 is provided on the side wall of the first transmission tube 33 away from the quick-tightening wrench 22, and a rotating groove 332 is axially provided around the first transmission tube 33 at one end of the slide groove 331 close to the pre-tightening groove 11, and the width of the rotating groove 332 is twice the width of the torque wrench 21. A notch matched with the slide groove 331 and the rotating groove 332 is provided on the sleeve 221 of the quick-tightening wrench 22, and the rotation of the torque wrench 21 and the conversion of the front and rear positions can be realized by the cooperative drive of the rodless cylinder 34 and the second driving gear 363.

[0042] Reference Figure 3 and Figure 4 , the positioning auxiliary test mechanism 6 includes a distance sensor 61, an infrared sensor 62, an infrared ink ejector 63 and a rotating micro-reaction sensing element 64;

[0043] The distance sensor 61 is installed on the side wall of the pre-tightening plane 111, and is used to sense the distance between the pre-tightening plane 111 and the locking end face of the screw head. The infrared sensor 62 is installed on the top inner wall of the pre-tightening groove 11. The infrared ink ejector 63 is rotatably installed on the inner wall of the pre-tightening groove 11 and is located on the side of the infrared sensor 62 close to the opening of the pre-tightening groove 11. The infrared ink ejector 63 is connected to the distance sensor 61 by signal. The infrared ink ejector 63 is connected to the external ink storage via a connecting hose. Preferably, the ink storage is installed on the test base 1. When the distance sensor 61 senses the screw When the end face of the nail head is abutted against the pre-tightening plane 111 and tightened, the infrared ink injector 63 is started to spray a small amount of infrared ink onto the side wall of the screw head to achieve the marking effect; the infrared sensor 62 is connected to the reciprocating motor 361 signal, which can sense the infrared ink mark and then drive the rotation of the torque wrench 21, and the rotating micro-reaction sensing part 64 is installed on the inner wall of the pre-tightening groove 11 to slide in the direction of approaching or away from the screw to sense the slight rotation of the screw head. In this embodiment, the use of the distance sensor 61, the infrared sensor 62, and the infrared ink injector 63 are all existing technologies and will not be elaborated on.

[0044] Furthermore, a micro motor 7 for driving the infrared ink ejector 63 to rotate is installed in the test base 1. The output shaft of the micro motor 7 can rotate reciprocatingly. The infrared ink ejector 63 is initially tilted and the intersection of the ejection direction straight line and the screw head is located between the infrared sensor 62 and the pre-tightening plane 111. The infrared ink ejector 63 rotates toward the opening side of the pre-tightening groove 11 while ejecting. The maximum rotation angle of the infrared ink ejector 63 is that the straight line where the ejection direction of the infrared ink ejector 63 is located is perpendicular to the screw axis, so that a straight line of infrared ink can be ejected on the side wall of the screw head directly below the infrared sensor 62, which is convenient for the sensing of the infrared sensor 62.

[0045] Furthermore, a driving electric cylinder 8 for driving a rotating micro-reaction sensing member 64 to slide is installed in the test base 1. The rotating micro-reaction sensing member 64 is a contact displacement sensor for sensing a slight rotation of the screw head. The rotating micro-reaction sensing member 64 is connected to the rodless cylinder 34 and the reciprocating motor 361 by signal, and the driving electric cylinder 8 is connected to the control panel 10 by signal. Specifically, the control panel 10 adopts a PC, and a PLC control system is preset in the control panel 10 for connecting and controlling the operation of each electrical component on the test base 1. At the same time, the torque data measured by the torque wrench 21 can be displayed to facilitate the detection personnel to obtain the detection data by timing. The use and control of the control panel 10 are prior art and will not be elaborated on.

[0046] The working principle of a screw assembly torque testing device of the present invention is as follows:

[0047] (1) Before testing, the tester selects a suitable nut adapter 9 according to the size and thread requirements of the screw to be tested and installs and fixes it on the test base 1, and pre-tightens the screw until it is connected to the nut adapter 9;

[0048] (2) Start the device for testing through the control panel 10;

[0049] (3) The distance sensor 61 senses the distance between the end face of the screw head and the pre-tightening plane 111, and feeds back the distance signal to the control panel 10. The control panel 10 starts the linear motor 1 31 to drive the first transmission tube 33 to move until the adapter 222 on the quick-tightening wrench 22 is engaged with the screw head. Then the control panel 10 controls the linear motor 2 12 to drive the driving gear 1 362 on the reciprocating motor 361 to mesh with the driven gear 1 364 on the first transmission tube 33. At this time, the quick-tightening wrench 22 is located in front of the torque wrench 21. Then the control panel 10 controls the output shaft of the reciprocating motor 361 to rotate. Then, the quick-tightening wrench 22 is driven to tighten the screw. The angle of the quick-tightening wrench 22 is preferably 90 degrees. After one tightening, the linear motor 1 31 drives the quick-tightening wrench 22 away from the screw head until they are separated from each other. The driving gear 1 362 on the reciprocating motor 361 moves synchronously under the drive of the linear motor 2 12, so that the driving gear 1 362 and the driven gear 1 364 remain engaged. The reciprocating motor 361 rotates in the opposite direction, driving the quick-tightening wrench 22 to restore the initial state. This is a one-time tightening process of the quick-tightening wrench 22, and it is repeated until the end face of the screw head fits the pre-tightening plane 111 and is tightened.

[0050] (4) The distance sensor 61 senses that the screw is tightened and feeds back the tightening data to the control panel 10. The control panel 10 controls the infrared ink jet 63 to mark. After the marking is completed, the control panel 10 starts the driving mechanism 3 to drive the quick tightening wrench 22 to reversely loosen the screw by an angle of 90 degrees.

[0051] (5) Subsequently, the driving mechanism 3 in the control panel 10 is started to exchange the front and rear positions of the quick tightening wrench 22 and the torque wrench 21, so that the torque wrench 21 is engaged with the screw head. Synchronously, the linear motor 2 12 drives the driving gear 2 363 to mesh with the driven gear 2 365, thereby driving the torque wrench 21 to tighten the bolt. When the infrared sensor 62 senses the infrared ink, the torque wrench 21 stops twisting and feeds back the torque data to the control panel 10, thereby realizing the first detection of the screw assembly torque through the marking method.

[0052] (6) After receiving the torque signal, the control panel 10 sends a control signal to start the driving electric cylinder 8, and the driving electric cylinder 8 drives the rotating micro-reaction sensing element 64 to move toward the screw head until the contact abuts against the side wall of the screw head, and then the rotating micro-reaction sensing element 64 transmits the abutment signal to the control panel 10;

[0053] (7) The control panel 10 receives the resistance signal and controls the driving mechanism 3 again to drive the torque wrench 21 to tighten the screw head. When the screw head rotates slightly, the contact of the rotating micro-reaction sensing element 64 senses and feeds back the sensing signal to the control panel 10. At the same time, the torque wrench 21 stops twisting and transmits the torque value to the control panel 10. The second detection of the screw assembly torque is achieved through the tightening method, which further ensures the accuracy of the value.

[0054] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A screw assembly torque testing device, comprising: The test base (1) is an integrated base of the entire device. The test base (1) is detachably provided with a nut adapter (9). A pre-tightening groove (11) is provided on the side wall of the test base (1) away from the installation side of the nut adapter (9). The depth of the pre-tightening groove (11) is not greater than 0.2 times the height of the screw head. The inner bottom wall of the pre-tightening groove (11) is a pre-tightening plane (111). The screw passes through the pre-tightening groove (11) and is threadedly connected to the nut adapter (9). The tightening torque measuring mechanism (2) comprises a torque wrench (21) and a quick tightening wrench (22), wherein the torque wrench (21) and the quick tightening wrench (22) can both move in a direction approaching or away from the pre-tightening groove (11), and the front and rear positions of the torque wrench (21) and the quick tightening wrench (22) are interchangeable, and the torque wrench (21) and the quick tightening wrench (22) can both rotate around the screw axis for tightening the screw, and the torque wrench (21) can read the torque value of the wrench, and the test base (1) is provided with a driving mechanism (3) for driving the torque wrench (21) and the quick tightening wrench (22) to move and rotate; A positioning auxiliary testing mechanism (6) is used for monitoring various detection positions of the screw and cooperates with the tightening torque measuring mechanism (2) to realize dual data detection of the screw torque; A control panel (10) is electrically connected to the tightening torque measuring mechanism (2) and the positioning auxiliary testing mechanism (6) to realize device driving and measurement value display; The driving mechanism (3) comprises a linear motor (31), a mounting seat (32), a first transmission tube (33), a rodless cylinder (34), a second transmission tube (35) and a power assembly (36), wherein the first transmission tube (33) and the second transmission tube (35) are both cylindrical tubes, the linear motor (31) is arranged on the test base (1) and the slider slides toward or close to the preload groove (11), the mounting seat (32) is arranged on the slider of the linear motor (31), the first transmission tube (33) is reciprocatingly mounted on the mounting seat (32), the quick-tightening wrench (22) is detachably arranged on the outer wall of one end of the first transmission tube (33) close to the preload groove (11), and the The rodless cylinder (34) is arranged on the mounting seat (32) and is located at one end of the first transmission tube (33) away from the pre-tightening groove (11); the second transmission tube (35) is rotatably mounted on the slider of the rodless cylinder (34) and coaxially penetrates the first transmission tube (33); one end of the second transmission tube (35) close to the pre-tightening groove (11) can extend out of or into the first transmission tube (33); the torque wrench (21) is detachably arranged on the outer wall of the second transmission tube (35) and can move with the second transmission tube (35) within the range of the front and rear sides of the quick-tightening wrench (22); the power assembly (36) cooperates with the positioning auxiliary test mechanism (6) to respectively drive the first transmission tube (33) and the second transmission tube (35) to rotate; The power assembly (36) comprises a reciprocating motor (361), a driving gear 1 (362), a driving gear 2 (363), a driven gear 1 (364) and a driven gear 2 (365); the reciprocating motor (361) is arranged on the mounting seat (32); the driving gear 1 (362) and the driving gear 2 (363) are sleeved and fixed on the output shaft of the reciprocating motor (361) at intervals; the driven gear 1 (364) is sleeved on the outer wall of the first transmission tube (33) and can move with the slider of the linear motor 1 (31) to mesh with the driving gear 1 (362); the driven gear 2 (365) is sleeved on the outer wall of the second transmission tube (35) and can move with the slider of the rodless cylinder (34) to mesh with the driving gear 2 (363); and the driving gear 1 (362) and the driving gear 2 (363) are not meshed at the same time; The positioning auxiliary test mechanism (6) comprises a distance sensor (61), an infrared sensor (62), an infrared ink jet (63) and a rotational micro-reaction sensing element (64); the distance sensor (61) is arranged on the side wall of the pre-tightening plane (111) and is used to sense the distance between the pre-tightening plane (111) and the locking end face of the screw head; the infrared ink jet (63) is connected to the distance sensor (61) by signal; the infrared sensor (62) is connected to the reciprocating motor (361) by signal; and the rotational micro-reaction sensing element (64) is arranged on the inner wall of the pre-tightening groove (11) and slides in a direction close to or away from the screw to sense slight rotation of the screw head.

2. A screw assembly torque testing device according to claim 1, characterized in that: When the torque wrench (21) is located on a side of the quick-tightening wrench (22) away from the pre-tightening groove (11), the torque wrench (21) is located on a side wall of the second transmission tube (35) away from the quick-tightening wrench (22); when the torque wrench (21) is located on a side of the quick-tightening wrench (22) close to the pre-tightening groove (11), the torque wrench (21) is located on a side wall of the second transmission tube (35) facing the quick-tightening wrench (22), and a slide groove (331) is provided on a side wall of the first transmission tube (33) away from the quick-tightening wrench (22), and a rotation groove (332) is provided at one end of the slide groove (331) close to the pre-tightening groove (11) around the axial direction of the first transmission tube (33).

3. A screw assembly torque testing device according to claim 1, characterized in that: The rotating micro-reaction sensing element (64) is a contact displacement sensor, and the rotating micro-reaction sensing element (64) is signal-connected to the rodless cylinder (34) and the reciprocating motor (361).

4. A screw assembly torque testing device according to claim 1, characterized in that: The infrared ink ejector (63) is rotatably disposed on the inner wall of the pre-tightening groove (11) and is located on a side of the infrared sensor (62) close to the opening of the pre-tightening groove (11). The infrared ink ejector (63) is initially tilted and the intersection of a straight line in the ejection direction and the screw head is located between the infrared sensor (62) and the pre-tightening plane (111). The infrared ink ejector (63) ejects while rotating toward the opening of the pre-tightening groove (11).

5. A screw assembly torque testing device according to claim 4, characterized in that: The maximum rotation angle of the infrared ink ejector (63) is when the straight line where the ejection direction of the infrared ink ejector (63) is located is perpendicular to the screw axis.

6. A screw assembly torque testing device according to claim 1, characterized in that: The quick-tightening wrench (22) is detachably provided with an adapter (222) adapted to the screw.

7. A screw assembly torque testing device according to claim 1, characterized in that: The reciprocating motor (361) is a variable frequency motor.

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