An oil pressure pulse wrench calibration device

Abstract

The present application provides an oil pressure pulse wrench calibration device, comprising a main frame, a main lifting plate, a main lifting screw mechanism, an XY displacement platform, a torque output mechanism and a wrench clamping unit. When calibrating the wrench, first fix the impact wrench testing device on the installation table of the XY displacement platform; then calibrate the torque of the impact wrench testing device through the torque output mechanism; the XY displacement platform then moves the impact wrench testing device to the position directly below the wrench clamping unit to detect and calibrate the impact wrench. During detection, while the impact wrench is rotating the test bolt, the main lifting screw mechanism drives the main lifting plate to slowly move downward to make the impact wrench descend synchronously with the locking process of the test bolt, so that the detection conditions of the impact wrench are more consistent and the accuracy of the detection result is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wrench measurement, in particular to an oil pressure pulse wrench calibration device. BACKGROUND

[0002] A wrench is a tool used to tighten nuts and bolts, and ensures that the torque between the nut and the bolt reaches the set torque.

[0003] There are two types of wrenches, one is a continuous output type wrench, and the other is an impact wrench, and the oil pressure pulse wrench belongs to the latter type. The output shaft of the continuous output type wrench rotates continuously with the nut until it is locked. The other type is an impact wrench, which is driven by a prime mover through a reducer to drive the driving part of the impact mechanism, and then drives the driven part through the meshing of the toothed insert. The rotating striking part of the driving part will produce intermittent rotation strikes from the output shaft of the driven part after exceeding the static torque of the wrench. The rotation striking movement makes the nut finally rotate and tighten.

[0004] For the continuous output type wrench, its performance only needs to be measured by measuring its output torque, and a rotary torque sensor can be connected to the output shaft to directly measure it.

[0005] For the impact wrench, its performance is generally defined by the torque coefficient K, K=T / (F*D), where T is the torque, F is the locking force, and D is the bolt diameter.

[0006] The calibration of the impact wrench is currently completed with the help of an impact wrench tester, which is a bolt simulator with locking force testing function. First, the torque coefficient of the bolt simulator is calibrated: the bolt simulator is tested multiple times by a torque output device with torque measurement function, and the output torque and locking force are linearly fitted to obtain the torque coefficient K of the bolt simulator. Then, the impact wrench to be tested is tested on the bolt simulator, and finally the locking force F measured by the bolt simulator is multiplied by the torque coefficient K of the bolt simulator to obtain the torque T of the impact wrench, T=K*F*D, where D is the bolt diameter.

[0007] The current calibration of the impact wrench is basically manually operated, and the holding force of the operator on the wrench will affect the result. A wrench calibration device that does not rely on manual operation is needed. SUMMARY

[0008] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide an oil pressure pulse wrench calibration device.

[0009] To achieve the above purpose, the technical scheme adopted by the present application to solve its technical problems is: an oil pressure pulse wrench calibration device, comprising:

[0010] a main frame body comprising a base, a guide column and a main top plate, the guide column being vertically mounted on the base, the main top plate being mounted on the top end of the guide column;

[0011] a main lifting plate being liftably mounted on the guide column;

[0012] a main lifting screw mechanism comprising a main screw rod, a main nut and a main lifting drive mechanism, two ends of the main screw rod being rotatably mounted on the base and the main top plate respectively, the main lifting plate being fixedly connected to the main nut, the main lifting drive mechanism driving the main screw rod to rotate and in turn driving the main lifting plate to move up and down along the guide column;

[0013] an XY direction shifting platform being mounted on the base, the XY direction shifting platform comprising an X direction shifting mechanism, an X direction shifting table, a Y direction shifting mechanism and a mounting table, the X direction shifting table being left-right translatable mounted on the base, the X direction shifting mechanism driving the X direction shifting table to left-right translate along the base, the mounting table being front-rear translatable mounted on the X direction shifting table, the Y direction shifting mechanism driving the mounting table to front-rear translate along the X direction shifting table;

[0014] a torque output mechanism comprising a motor, a speed reduction mechanism, a standard torque sensor and an angle encoder, a machine base of the speed reduction mechanism being fixedly mounted on the main lifting plate, an output shaft of the motor being connected with an upper input end of the speed reduction mechanism, the angle encoder being used for measuring the rotation angle of a lower output end of the speed reduction mechanism, the standard torque sensor being connected with the lower output end of the speed reduction mechanism;

[0015] a wrench clamping unit comprising a lifting frame, a lifting drive mechanism, a baffle, a first pressure sensor and a clamping plate, the lifting frame being liftably mounted on the main lifting plate, the lifting drive mechanism driving the lifting frame to move up and down relative to the main lifting plate, the baffle being fixedly connected to the lower part of the lifting frame, the clamping plate being up-down movably mounted on the lifting frame below the baffle, the first pressure sensor being mounted between the baffle and the clamping plate, the clamping plate being provided with a detachable locking member for clamping a wrench to be measured;

[0016] an impact wrench testing device being mounted on the mounting table of the XY direction shifting platform.

[0017] The impact wrench calibration device is fixedly installed on the installation table of the XY displacement platform when the wrench is calibrated; then the impact wrench calibration device is moved to the right below the torque output mechanism by the XY displacement platform, the main lifting screw mechanism drives the main lifting plate to descend, so that the standard torque sensor is butted with the impact wrench calibration device, the torque of the impact wrench calibration device is calibrated through the torque output mechanism, and the main lifting plate is lifted together with the torque output mechanism after calibration; the impact wrench calibration device is moved to the right below the wrench clamping unit by the XY displacement platform, the impact wrench to be detected is fixed on the wrench clamping unit, the main lifting screw mechanism drives the main lifting plate to descend, so that the impact wrench to be detected is butted with the impact wrench calibration device, and the impact wrench is detected and calibrated. When the impact wrench is detected, the main lifting screw mechanism drives the main lifting plate to slowly descend while the impact wrench is screwed on the bolt, so that the impact wrench is descended synchronously with the locking process of the test bolt, the detection conditions of the impact wrench are more consistent, and the detection result accuracy is improved. In addition, the calibration device is a multifunctional calibration device, the installation table of the XY displacement platform is provided with longitudinal and transverse intersecting T-shaped grooves, different models of wrench calibration instruments and bolt simulators and other commonly used related devices of the wrench calibration are conveniently fixed and installed, and the calibration and detection are performed. The torque output mechanism can adjust the output rotation speed to adapt to different torque measurement, angle measurement and other test conditions. The XY displacement platform can complete accurate displacement of the device to be detected, ensures coaxial centering with the torque output mechanism during detection, and improves the detection accuracy.

[0018] Further, the lifting frame below the clamping plate is sleeved with a spring.

[0019] By adopting the preferred scheme, the spring buffers the clamping plate, and the stability of the impact wrench is ensured.

[0020] Further, before the wrench is started, the lifting drive mechanism drives the lifting frame to move, so that the detection force value of the first pressure sensor is in the set range; after the wrench is started, the main lifting drive mechanism drives the main lifting plate to descend with the bolt, and when the detection force value of the first pressure sensor changes, the lifting drive mechanism drives the lifting frame to move, so that the detection force value of the first pressure sensor is kept in the set range.

[0021] By adopting the preferred scheme, the wrench is kept in a constant pressure range during the detection process, and the uniformity of the detection conditions is ensured.

[0022] Further, the lifting frame comprises a first guide rod, a second guide rod and an upper connecting plate, the first guide rod and the second guide rod are vertically and parallel arranged, the upper connecting plate is connected to the top end of the first guide rod and the second guide rod, the baffle is connected to the lower part of the first guide rod and the second guide rod, the first guide rod and the second guide rod are respectively vertically and rotatably installed on the main lifting plate through guide sleeves; the lifting driving mechanism comprises a lead screw and a driving motor, the screw rod of the lead screw is vertically and rotatably installed on the upper connecting plate through a bearing, the nut of the lead screw is installed on the main lifting plate, and the driving motor drives the screw rod to rotate to realize the lifting movement of the lifting frame.

[0023] By adopting the above preferred scheme, the lifting and pressurizing stability is improved.

[0024] Further, the impact wrench testing device comprises a first impact wrench testing device, and the first impact wrench testing device comprises a first impact wrench testing instrument and a first mounting jig.

[0025] The first impact wrench testing instrument comprises a mounting rack, a first simulated bolt unit and a torque table, the mounting rack comprises an upper horizontal plate and a lateral inclined plate, the upper horizontal plate and the lateral inclined plate are arranged at an acute angle, the first simulated bolt unit is installed below the upper horizontal plate, the first simulated bolt unit comprises a test bolt, a gasket, a force sensor unit, a first top plate, an upper spring disc, a butterfly spring, a spacer, a threaded sleeve and a spring chamber, the threaded sleeve is connected with the bottom of the spring chamber, the upper spring disc, the butterfly spring and the spacer are sequentially arranged in the spring chamber from top to bottom, the first top plate is located at the top of the spring chamber and has a freedom degree of moving up and down relative to the spring chamber, the force sensor unit is located at the middle upper part of the first top plate, the gasket is located between the test bolt and the force sensor unit, and the torque table is signal connected with the force sensor unit.

[0026] The first mounting jig comprises a testing instrument support and a torque table image acquisition device, the testing instrument support comprises a horizontal bottom plate and an inclined support plate, the horizontal bottom plate is installed on the mounting table of the XY-direction displacement platform, the inclined support plate is arranged at an acute angle with the horizontal bottom plate, the inclined support plate is provided with a horizontally arranged limiting rib, the lateral inclined plate is tightly locked with the inclined support plate, and the camera of the torque table image acquisition device is located above the torque table.

[0027] Adopting the above preferred scheme, the first impact wrench testing device is suitable for the current calibration method commonly used for impact wrenches. According to the formula T=K*F*D, the first simulated bolt unit automatically converts the locking force detected by the force sensor unit into a torque value, and outputs the torque value through a torque table. First, the first impact wrench testing device is installed under the torque output mechanism, and the torque value of the torque table is collected through the torque table image acquisition device. The collected torque value is compared with the standard torque value measured by the standard torque sensor to calibrate the first impact wrench testing device. Then, the first impact wrench testing device is moved to the position below the impact wrench to be tested, and the impact wrench is calibrated.

[0028] Further, the impact wrench testing device comprises a second impact wrench testing device, which comprises:

[0029] a bottom plate;

[0030] a support column vertically fixedly installed on the bottom plate;

[0031] a second top plate fixedly installed at the top end of the support column, wherein a bearing hole is arranged in the middle of the second top plate, a ball bearing is embedded in the bearing hole, the inner diameter of the ball bearing is greater than the outer diameter of the threaded part of the test bolt, and the head of the test bolt has an outer diameter smaller than the inner diameter of the outer ring body of the ball bearing;

[0032] a first torque sensor installed above the bottom plate, wherein a limiting structure is arranged on the bottom plate to limit the rotation of the outer shell part of the first torque sensor, and a check structure is arranged on the bottom plate to limit the rotation of the lower shaft body of the first torque sensor;

[0033] a second simulated bolt unit, which comprises a nut seat, a gasket chamber, a lower gasket, a butterfly spring, an upper gasket, a force sensor seat, a second pressure sensor, and a test bolt. The lower end of the nut seat is connected to the upper input end of the first torque sensor, and a threaded hole is arranged in the center of the nut seat. The gasket chamber is arranged around the nut seat, and a stop structure is arranged at the bottom of the gasket chamber to limit the upward movement of the nut seat. The lower gasket, the butterfly spring, the upper gasket, and the force sensor seat are sequentially arranged in the gasket chamber from bottom to top. The lower gasket, the butterfly spring, and the upper gasket are arranged around the nut seat and have a gap between the outer circumferential wall of the nut seat. The force sensor seat has a degree of freedom to move up and down relative to the gasket chamber. The second pressure sensor is installed at the middle position of the force sensor seat, and the second pressure sensor has a through hole in the center for the test bolt to pass through. The second pressure sensor is arranged below the ball bearing. The test bolt passes through the ball bearing, the second pressure sensor, the force sensor seat, and the threaded hole of the nut seat from top to bottom.

[0034] Adopting the above preferred scheme, the second impact wrench testing device is a new impact wrench testing method proposed in the application, the first torque sensor is installed below the second simulated bolt unit, and the torque of the impact wrench when locking the bolt can be directly measured, the output shaft of the impact wrench is directly connected with the test bolt, and the transmission of the impact wrench energy is not affected; the middle of the second top plate is provided with a ball bearing, before the test bolt is locked, the inner ring body of the ball bearing is rotated after the bolt head contacts the end face of the inner ring body, the rolling friction of the bearing has little loss on the torque, and thus the accuracy of the locking torque measurement is improved. The torque T and the locking force F of the impact wrench when locking the bolt can be directly measured through the second impact wrench testing device, the torque coefficient K of the impact wrench can be directly obtained by substituting the formula K=T / (F*D), and the accuracy of the performance detection of the impact wrench is improved. During calibration, the second pressure sensor is first calibrated on the force standard machine, then the second pressure sensor is installed back to the second impact wrench testing device, the second impact wrench testing device is fixed to the XY displacement platform, and the first torque sensor is calibrated under the torque output mechanism. After calibration, the second impact wrench testing device is moved below the wrench clamping unit, and the torque coefficient K of the impact wrench is calibrated.

[0035] Further, the force sensor seat is provided with a check shaft extending outward in the radial direction on both sides, the check shaft is provided with a bearing outside, the top of the gasket chamber is provided with a U-shaped groove, the bearing is located in the U-shaped groove and can move up and down along the U-shaped groove, and the side wall of the U-shaped groove is in contact with the outer periphery of the bearing and limits the left and right positions of the bearing.

[0036] The above preferred scheme ensures that the force sensor seat has a vertical activity freedom during locking, and improves the accuracy of the locking force measured by the second pressure sensor.

[0037] Further, the center of the force sensor seat is provided with an embedded groove, the second pressure sensor is embedded in the embedded groove, the top end of the second pressure sensor is provided with a pressure ring body, and the outer diameter of the pressure ring body is smaller than the inner diameter of the outer ring body of the ball bearing.

[0038] The above preferred scheme maximally reduces the torque loss and ensures that the torque of the impact wrench fully acts on the locking of the bolt.

[0039] Further, a fixed torque wrench calibration device is installed on the mounting table of the XY displacement platform, and the fixed torque wrench calibration device comprises a third analog bolt unit, a second torque sensor and a sensor support frame unit.

[0040] With the preferred scheme, calibration of the fixed torque wrench can be compatible, the compression spring can support the second torque sensor upward, eliminating the influence of the gravity of the second torque sensor on the detection result, and the sensor support frame unit can ensure that the position of the second torque sensor remains stable during detection and stably descends with the test bolt. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort based on these drawings.

[0042] Figure 1 is a structural schematic diagram of an embodiment of the present application.

[0043] Figure 2 is a structural schematic diagram of a wrench clamping unit.

[0044] Figure 3 is a structural schematic diagram of a first impact wrench calibration device.

[0045] Figure 4 is a structural schematic diagram of a first analog bolt unit.

[0046] Figure 5 is a perspective view of a second impact wrench calibration device.

[0047] Figure 6is a sectional view of the second impact wrench verification device.

[0048] Figure 7 is a structural schematic diagram of the fixed torque wrench verification device.

[0049] Figure 8 is a structural schematic diagram of the sensor support frame unit.

[0050] Names of corresponding components represented by numbers and letters in the figures:

[0051] 10-main frame body; 11-base; 12-guide column; 13-main top plate; 21-main lifting plate; 22-main screw rod; 23-main nut; 30-XY displacement platform; 31-X displacement mechanism; 32-X displacement table; 33-Y displacement mechanism; 34-mounting table; 40-torque output mechanism; 41-motor; 42-reduction mechanism; 43-standard torque sensor; 50-wrench clamping unit; 52-lifting frame; 521-first guide rod; 522-second guide rod; 523-upper connecting plate; 524-guide sleeve; 53-lifting drive mechanism; 531-drive motor; 532-screw rod; 533-nut; 54-baffle; 55-first pressure sensor; 56-clamping plate; 57-locking piece; 58-spring; 59-wrench to be measured; 60-first impact wrench verification device; 61-mounting frame; 611-upper horizontal plate; 612-lateral inclined plate; 62-first simulated bolt unit; 621-test bolt; 622-spacer; 623-force sensor unit; 624-first top plate; 625-upper spring disc; 626-butterfly spring; 627-septum; 628-threaded sleeve; 629-spring piece chamber; 63-torque table; 64-verification instrument support; 641-horizontal bottom plate; 642-inclined support plate; 643-limiting rib; 65-torque table image acquisition device; 70-second impact wrench verification device; 71-bottom plate; 711-limiting structure; 72-first torque sensor; 731-strut; 732-second top plate; 733-roller bearing; 74-second simulated bolt unit; 741-nut seat; 742-spacer chamber; 7421-U-shaped groove; 743-lower spacer; 744-butterfly spring; 745-upper spacer; 746-force sensor seat; 7461-check shaft; 7462-bearing; 747-second pressure sensor; 7471-pressure ring body; 748-test bolt; 80-fixed torque wrench verification device; 81-third simulated bolt unit; 82-second torque sensor; 83-sensor support frame unit; 831-mounting bottom plate; 832-support frame; 833-support lifting plate; 834-height adjustment screw rod; 835-left baffle; 836-right baffle; 837- support plate; 838-compression spring. DETAILED DESCRIPTION

[0052] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0053] As shown in Figure 1 , 2 An embodiment of the present application is an oil pressure pulse wrench calibration device, comprising:

[0054] A main frame body 10, comprising a base 11, a guide column 12 and a main top plate 13, the guide column 12 is vertically installed on the base 11, and the main top plate 13 is installed at the top end of the guide column 12;

[0055] A main lifting plate 21, which is installed on the guide column 12 in a lifting manner;

[0056] A main lifting screw mechanism, comprising a main screw rod 22, a main nut 23 and a main lifting driving mechanism, both ends of the main screw rod 22 are rotatably installed on the base 11 and the main top plate 13 respectively, the main lifting plate 21 is fixedly connected to the main nut 23, and the main lifting driving mechanism drives the main screw rod 22 to rotate and in turn drives the main lifting plate 21 to move up and down along the guide column 12;

[0057] An XY direction displacement platform 30, which is installed on the base 11, comprising an X direction displacement mechanism 31, an X direction displacement table 32, a Y direction displacement mechanism 33 and a mounting table 34, the X direction displacement table 32 is installed on the base 11 in a left-right translatable manner, the X direction displacement mechanism 31 drives the X direction displacement table 32 to move left and right along the base 11, the mounting table 34 is installed on the X direction displacement table 32 in a front-rear translatable manner, and the Y direction displacement mechanism 33 drives the mounting table 34 to move front and back along the X direction displacement table 32;

[0058] A torque output mechanism 40, comprising a motor 41, a speed reduction mechanism 42 and a standard torque sensor 43, the base of the speed reduction mechanism 42 is fixedly installed on the main lifting plate 21, the output shaft of the motor 41 is connected with the upper input end of the speed reduction mechanism 42, and the standard torque sensor 43 is connected with the lower output end of the speed reduction mechanism 42;

[0059] The wrench clamping unit 50 comprises a lifting frame 52, a lifting drive mechanism 53, a baffle 54, a first pressure sensor 55 and a clamping plate 56, the lifting frame 52 is installed on the main lifting plate 21 in a lifting manner, the lifting drive mechanism 53 drives the lifting frame 52 to move up and down relative to the main lifting plate 21, the baffle 54 is fixedly connected to the lower part of the lifting frame 52, the clamping plate 56 is installed on the lifting frame below the baffle 54 in a movable manner, the first pressure sensor 55 is installed between the baffle 54 and the clamping plate 56, and the clamping plate 56 is provided with a detachable locking piece 57 for clamping the wrench to be measured 59.

[0060] The impact wrench testing device is installed on the mounting table 34 of the XY direction displacement platform.

[0061] The beneficial effects of the above technical scheme are that: when the wrench is calibrated, the impact wrench testing device is first fixedly installed on the mounting table of the XY direction displacement platform; then the XY direction displacement platform moves the impact wrench testing device to the position directly below the torque output mechanism, the main lifting lead screw mechanism drives the main lifting plate to descend, so that the standard torque sensor is butted with the impact wrench testing device, the torque of the impact wrench testing device is calibrated through the torque output mechanism, and the main lifting plate is lifted together with the torque output mechanism after calibration; the XY direction displacement platform moves the impact wrench testing device to the position directly below the wrench clamping unit, after the impact wrench to be measured is fixed on the wrench clamping unit, the main lifting lead screw mechanism drives the main lifting plate to descend, so that the impact wrench to be measured is butted with the impact wrench testing device, and the impact wrench is detected and calibrated. During detection, the main lifting lead screw mechanism drives the main lifting plate to slowly descend while the impact wrench is rotating and screwing the bolt, so that the impact wrench descends synchronously with the locking process of the test bolt, the detection conditions of the impact wrench are more consistent, and the detection result accuracy is improved.

[0062] As shown in Figure 2 In other embodiments of the present application, a spring 58 is sleeved on the lifting frame below the clamping plate 56. The beneficial effects of the above technical scheme are that: the spring buffers the clamping plate, and ensures the stability of the impact wrench.

[0063] In the present application, the specific structure of the main lifting drive mechanism is not limited, and can be selected from the prior art, such as a reduction motor plus chain wheel transmission form.

[0064] In some other embodiments of the present application, when detecting, the lifting driving mechanism 53 drives the lifting frame 52 to move so that the detection force value of the first pressure sensor 55 is within the set range before the impact wrench is started; after the impact wrench is started, the main lifting driving mechanism drives the main lifting plate 21 to descend with the bolt, and at the same time, when the detection force value of the first pressure sensor 55 changes, the lifting driving mechanism 53 drives the lifting frame 52 to move so that the detection force value of the first pressure sensor 55 is kept within the set range. The beneficial effect of the above technical solution is that the bolt is kept within the set pressure range by the impact wrench during the detection process, thereby ensuring the uniformity of the detection conditions.

[0065] As shown in Figure 2 In some other embodiments of the present application, the lifting frame 52 comprises a first guide rod 521, a second guide rod 522 and an upper connecting plate 523, the first guide rod 521 and the second guide rod 522 are vertically and parallelly arranged, the upper connecting plate 523 is connected to the top ends of the first guide rod 521 and the second guide rod 522, the baffle 54 is connected to the lower parts of the first guide rod 521 and the second guide rod 522, and the first guide rod 521 and the second guide rod 522 are respectively and vertically installed on the main lifting plate 21 through guide sleeves 524; the lifting driving mechanism 53 comprises a lead screw and a driving motor 531, the screw rod 532 of the lead screw is rotatably and vertically installed on the upper connecting plate 523 through a bearing, the nut 533 of the lead screw is installed on the main lifting plate 21, and the driving motor 531 drives the screw rod 532 to rotate so as to realize the lifting and moving of the lifting frame 52. The beneficial effect of the above technical solution is that the lifting and pressing stability is improved.

[0066] As shown in Figure 1 , 3 , 4, in some other embodiments of the present application, the impact wrench detection device comprises a first impact wrench detection device 60, the first impact wrench detection device 60 comprises a first impact wrench detection instrument and a first mounting jig;

[0067] The first impact wrench tester comprises a mounting rack 61, a first simulated bolt unit 62 and a torque table 63, the mounting rack 61 comprises an upper horizontal plate 611 and a lateral inclined plate 612, the upper horizontal plate 611 and the lateral inclined plate 612 are arranged at an acute angle, the first simulated bolt unit 62 is installed below the upper horizontal plate 611, the first simulated bolt unit 62 comprises a test bolt 621, a gasket 622, a force sensor unit 623, a first top plate 624, an upper spring disc 625, a butterfly spring 626, a spacer 627, a threaded sleeve 628 and a spring chamber 629, the threaded sleeve 628 is connected with the bottom of the spring chamber 629, the upper spring disc 625, the butterfly spring 626 and the spacer 627 are sequentially arranged in the spring chamber 629 from top to bottom, the first top plate 624 is located at the top of the spring chamber 629, the first top plate 624 has a freedom of moving up and down relative to the spring chamber 629, the force sensor unit 623 is located at the middle upper part of the first top plate 624, the gasket 622 is located between the test bolt 621 and the force sensor unit 623, and the torque table 63 is in signal connection with the force sensor unit 623.

[0068] The first mounting jig comprises a tester support 64 and a torque table image acquisition device 65, the tester support 64 comprises a horizontal bottom plate 641 and an inclined support plate 642, the horizontal bottom plate 641 is installed on the mounting table 34 of the XY-direction displacement platform, the inclined support plate 642 is arranged at an acute angle with the horizontal bottom plate 641, the inclined support plate 642 is provided with a limiting rib 643 arranged horizontally, the lateral inclined plate 612 is tightly locked with the inclined support plate 642, and the camera of the torque table image acquisition device 65 is located above the torque table 63.

[0069] The beneficial effects of the above technical scheme are as follows: the first impact wrench testing device is suitable for the current calibration method commonly used for impact wrenches, the first simulated bolt unit automatically converts the locking force detected by the force sensor unit into a torque value according to the formula T = K * F * D, and outputs the torque value through the torque table. First, the first impact wrench tester is installed under the torque output mechanism, the torque value of the torque table is acquired by the torque table image acquisition device, and the acquired torque value is compared with the standard torque value measured by the standard torque sensor for calibration, and then the first impact wrench testing device is displaced to below the impact wrench to be tested, and the impact wrench is calibrated.

[0070] As shown in Figure 5 , 6 In some other embodiments of the present application, the impact wrench testing device comprises a second impact wrench testing device 70, and the second impact wrench testing device 70 comprises:

[0071] a bottom plate 71;

[0072] a support column 731 vertically and fixedly installed on the bottom plate 71;

[0073] A second top plate 732 is fixed to the top end of the support column 731, and a bearing hole is provided in the middle of the second top plate 732, in which a ball bearing 733 is embedded. The inner diameter of the ball bearing 733 is larger than the outer diameter of the threaded part of the test bolt 748, and the head of the test bolt 748 has an outer diameter smaller than the inner diameter of the outer ring of the ball bearing 733.

[0074] A first torque sensor 72 is installed above the bottom plate 71, and a limiting structure 711 is provided on the bottom plate 71 to limit the rotation of the outer shell of the first torque sensor. A non-return structure is also provided on the bottom plate 71 to limit the rotation of the lower shaft of the first torque sensor.

[0075] A second analog bolt unit 74 includes a nut seat 741, a gasket chamber 742, a lower gasket 743, a butterfly spring 744, an upper gasket 745, a force sensor seat 746, a second pressure sensor 747, and a test bolt 748. The lower end of the nut seat 741 is connected to the upper input end of the first torque sensor 72, and a threaded hole is provided in the center of the nut seat 741. The gasket chamber 742 is located around the nut seat 741, and a stop structure is provided at the bottom of the gasket chamber 742 to limit the upward movement of the nut seat 741. The lower gasket 743, the butterfly spring 744, the upper gasket 745, and the force sensor seat 746 are arranged in the gasket chamber 742 from bottom to top. The lower gasket 743, the butterfly spring 744, and the upper gasket 745 are located around the outer circumferential wall of the nut seat 741 with a gap between them. The force sensor seat 746 has the freedom to move up and down relative to the gasket chamber 742. The second pressure sensor 747 is installed in the middle of the force sensor seat 746, and the center of the second pressure sensor 747 has a through hole for the test bolt 748 to pass through. The second pressure sensor 747 is located below the ball bearing 733. The test bolt 748 passes through the ball bearing 733, the second pressure sensor 747, and the force sensor seat 746 from top to bottom, and is connected to the threaded hole of the nut seat 741.

[0076] The beneficial effects of the above technical scheme are: the second impact wrench verification device is a new impact wrench verification method proposed in the application, the first torque sensor is installed below the second simulated bolt unit, the torque of the impact wrench when locking the bolt can be directly measured, the output shaft of the impact wrench is directly connected with the test bolt, and the transmission of the energy of the impact wrench is not affected; the middle of the second top plate is provided with a ball bearing, before the test bolt is locked, the bolt head is in contact with the end face of the inner ring body of the ball bearing, the inner ring body of the ball bearing is rotated, the rolling friction of the bearing has little loss on the torque, and therefore the accuracy of the locking torque measurement is improved. The torque T and the locking force F of the impact wrench when locking the bolt can be directly measured through the second impact wrench verification device, the torque coefficient K of the impact wrench can be directly obtained by substituting the formula K=T / (F*D), and the accuracy of the performance detection of the impact wrench is improved. When calibrating, the second pressure sensor is calibrated on the force standard machine, then the second pressure sensor is installed back to the second impact wrench verification device, the second impact wrench verification device is fixed to the XY displacement platform, and then the first torque sensor is calibrated by moving to the torque output mechanism. After calibration, the second impact wrench verification device is moved below the wrench clamping unit, and the torque coefficient K of the impact wrench is calibrated.

[0077] As shown in Figure 5 , in some other embodiments of the application, the force sensor seat 746 is provided with a check shaft 7461 extending radially outward on both sides, the check shaft 7461 is provided with a bearing 7462 outside, the top of the gasket chamber 742 is provided with a U-shaped groove 7421, the bearing 7462 is located in the U-shaped groove 7421 and can move up and down along the U-shaped groove 7421, and the side wall of the U-shaped groove 7421 is in contact with the outer periphery of the bearing 7462 and limits the left and right positions of the bearing 7462. The beneficial effects of the above technical scheme are: to ensure that the force sensor seat has the freedom of movement in the vertical direction when locking, and to improve the accuracy of the locking force measured by the second pressure sensor.

[0078] As shown in Figure 6 , in some other embodiments of the application, the center of the force sensor seat 746 is provided with an embedded groove, the second pressure sensor 747 is embedded in the embedded groove, the top end of the second pressure sensor 747 is provided with a pressure ring 7471, and the outer diameter of the pressure ring 7471 is smaller than the inner diameter of the outer ring body of the ball bearing 733. The beneficial effects of the above technical scheme are: to minimize the loss of torque, and to ensure that the torque of the impact wrench fully acts on the locking of the bolt.

[0079] As shown in Figure 7 , 8As shown, in some other embodiments of the present application, a torque wrench calibration device 80 is installed on the mounting table 34 of the XY displacement platform, and the torque wrench calibration device 80 comprises a third analog bolt unit 81, a second torque sensor 82, and a sensor support frame unit 83. The sensor support frame unit 83 comprises a mounting bottom plate 831, a support frame 832, a support lifting plate 833, a height adjusting screw 834, a left baffle 835, a right baffle 836, a holding plate 837, and a compression spring 838. The mounting bottom plate 831 is installed on the mounting table 34 of the XY displacement platform, the support frame 832 is vertically fixed on the mounting bottom plate 831, the support lifting plate 833 is installed on the support frame 832 in a lifting manner through the height adjusting screw 834, the left baffle 835 and the right baffle 836 are oppositely arranged on the support lifting plate 833, the shell of the second torque sensor 82 is located between the left baffle 835 and the right baffle 836, the holding plate 837 is located between the left baffle 835 and the right baffle 836, the lower surface of the shell of the second torque sensor 82 is lapped on the holding plate 837, the holding plate 837 is movably installed on the support lifting plate 833 through a guide shaft, the compression spring 838 is sleeved on the outer periphery of the guide shaft below the holding plate 837, and the two ends of the compression spring 838 are respectively abutted on the lower surface of the holding plate 837 and the upper surface of the support lifting plate 833. The beneficial effects of the above technical scheme are that the calibration of the torque wrench can be compatible, the position of the second torque sensor can be ensured to be stable during the detection process through the sensor support frame unit, and the second torque sensor can stably descend with the downward movement of the test bolt.

[0080] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A hydraulic pulse wrench calibration device, characterized in that, include: The main frame includes a base, guide columns, and a main top plate. The guide columns are vertically installed on the base, and the main top plate is installed on the top of the guide columns. The main lifting plate is mounted on the guide column in a height-adjustable manner; The main lifting screw mechanism includes a main screw, a main nut, and a main lifting drive mechanism. The two ends of the main screw are rotatably mounted on the base and the main top plate, respectively. The main lifting plate is fixedly connected to the main nut. The main lifting drive mechanism drives the main screw to rotate, thereby causing the main lifting plate to move up and down along the guide column. An XY-axis displacement platform is mounted on the base. The XY-axis displacement platform includes an X-axis displacement mechanism, an X-axis displacement stage, a Y-axis displacement mechanism, and a mounting platform. The X-axis displacement stage is movably mounted on the base. The X-axis displacement mechanism drives the X-axis displacement stage to move left and right along the base. The mounting platform is movably mounted on the X-axis displacement stage. The Y-axis displacement mechanism drives the mounting platform to move back and forth along the X-axis displacement stage. The torque output mechanism includes a motor, a reduction mechanism, a standard torque sensor, and an angle encoder. The base of the reduction mechanism is fixedly mounted on the main lifting plate. The output shaft of the motor is connected to the upper input end of the reduction mechanism. The angle encoder is used to measure the rotation angle of the lower output end of the reduction mechanism. The standard torque sensor is connected to the lower output end of the reduction mechanism. The torque output mechanism can adjust its output speed. A wrench clamping unit includes a lifting frame, a lifting drive mechanism, a baffle, a first pressure sensor, and a clamping plate. The lifting frame is movably mounted on a main lifting plate. The lifting drive mechanism drives the lifting frame to move up and down relative to the main lifting plate. The baffle is fixedly connected to the lower part of the lifting frame. The clamping plate is movably mounted on the lifting frame located below the baffle. The first pressure sensor is installed between the baffle and the clamping plate. The clamping plate is provided with a detachable locking element for clamping the wrench to be tested. The lifting frame includes a first guide rod, a second guide rod, and an upper connecting plate. The first and second guide rods are arranged vertically parallel. The upper connecting plate is connected to the top ends of the first and second guide rods. The baffle is connected to the lower parts of the first and second guide rods. The first rod and the second guide rod are respectively mounted on the main lifting plate via guide sleeves; the lifting drive mechanism includes a lead screw and a drive motor, the lead screw is rotatably mounted vertically on the upper connecting plate via bearings, the nut of the lead screw is mounted on the main lifting plate, and the drive motor drives the lead screw to rotate to realize the lifting and lowering movement of the lifting frame; a spring is sleeved on the lifting frame below the clamping plate; during testing, before the wrench is activated, the lifting drive mechanism drives the lifting frame to move so that the detection force value of the first pressure sensor is within the set range; after the wrench is activated, the main lifting drive mechanism drives the main lifting plate to descend with the bolt, and at the same time, when the detection force value of the first pressure sensor changes, the lifting drive mechanism drives the lifting frame to move so that the detection force value of the first pressure sensor remains within the set range; An impact wrench calibration device is installed on the mounting platform of the XY-axis displacement platform; During wrench calibration, the impact wrench calibration device is first fixedly mounted on the mounting platform of the XY-axis shifting platform. Then, the XY-axis shifting platform moves the impact wrench calibration device directly below the torque output mechanism. The main lifting screw mechanism drives the main lifting plate to descend, allowing the standard torque sensor to align with the impact wrench calibration device. The torque of the impact wrench calibration device is calibrated through the torque output mechanism. After calibration, the main lifting plate, along with the torque output mechanism, is raised. The XY-axis shifting platform then moves the impact wrench calibration device directly below the wrench clamping unit. After fixing the impact wrench to be tested onto the wrench clamping unit, the main lifting screw mechanism drives the main lifting plate to descend, allowing the impact wrench to be tested to align with the impact wrench calibration device for testing and calibration.

2. The hydraulic pulse wrench calibration device according to claim 1, characterized in that, The impact wrench calibration device includes a first impact wrench calibration device, which includes a first impact wrench calibration instrument and a first mounting fixture. The first impact wrench calibrator includes a mounting frame, a first simulated bolt unit, and a torque meter. The mounting frame includes an upper horizontal plate and a side inclined plate, which are set at an acute angle. The first simulated bolt unit is installed below the upper horizontal plate and includes a test bolt, a washer, a force sensor unit, a first top plate, an upper spring disc, a butterfly spring, a spacer, a threaded sleeve, and a spring chamber. The threaded sleeve is connected to the bottom of the spring chamber. The upper spring disc, butterfly spring, and spacer are arranged sequentially from top to bottom in the spring chamber. The first top plate is located at the top of the spring chamber and has the freedom to move up and down relative to the spring chamber. The force sensor unit is located in the upper middle part of the first top plate. The washer is located between the test bolt and the force sensor unit. The torque meter is signal-connected to the force sensor unit. The first mounting fixture includes a calibration instrument bracket and a torque meter image acquisition device. The calibration instrument bracket includes a horizontal base plate and an inclined support plate. The horizontal base plate is mounted on the mounting platform of the XY-axis displacement platform. The inclined support plate is set at an acute angle to the horizontal base plate. The inclined support plate is provided with horizontally set limiting ribs. The side inclined plate is fitted and locked to the inclined support plate. The camera of the torque meter image acquisition device is located above the torque meter.

3. The hydraulic pulse wrench calibration device according to claim 1, characterized in that, The impact wrench calibration device includes a second impact wrench calibration device, which includes: Base plate; The support column is vertically and fixedly installed on the base plate; The second top plate is fixed to the top of the support column. The second top plate has a bearing hole in the middle. A ball bearing is embedded in the bearing hole. The inner diameter of the ball bearing is larger than the outer diameter of the threaded part of the test bolt, and the outer diameter of the head of the test bolt is smaller than the inner diameter of the outer ring of the ball bearing. A first torque sensor is mounted above the base plate. The base plate is provided with a limiting structure to restrict the rotation of the housing of the first torque sensor and a check structure to restrict the rotation of the lower shaft of the first torque sensor. The second simulated bolt unit includes a nut seat, a washer chamber, a lower washer, a butterfly spring, an upper washer, a force sensor seat, a second pressure sensor, and a test bolt. The lower end of the nut seat is connected to the upper input end of the first torque sensor, and the nut seat has a threaded hole at its center. The washer chamber is located around the nut seat, and the bottom of the washer chamber has a stop structure that restricts the upward movement of the nut seat relative to it. The lower washer, butterfly spring, upper washer, and force sensor seat are arranged sequentially from bottom to top in the washer chamber. The lower washer, butterfly spring, and upper washer are located around the nut seat and have a gap between them and the outer circumferential wall of the nut seat. The force sensor seat has the freedom to move up and down relative to the washer chamber. The second pressure sensor is installed in the middle of the force sensor seat, and the second pressure sensor has a through hole at its center for the test bolt to pass through. The second pressure sensor is located below the ball bearing. The test bolt passes sequentially from above through the ball bearing, the second pressure sensor, the force sensor seat, and the threaded hole of the nut seat.

4. The hydraulic pulse wrench calibration device according to claim 3, characterized in that, The force sensor base has radially outward extending check shafts on both sides. A bearing is fitted around the outer periphery of the check shaft. A U-shaped groove is provided on the top of the gasket chamber. The bearing is located in the U-shaped groove and can move up and down along the U-shaped groove. The sidewall of the U-shaped groove contacts the outer periphery of the bearing and restricts the left and right position of the bearing.

5. The hydraulic pulse wrench calibration device according to claim 4, characterized in that, The force sensor seat has a recessed groove at its center, and the second pressure sensor is embedded in the groove on its outer periphery. The top of the second pressure sensor has a pressure ring, the outer diameter of which is smaller than the inner diameter of the outer ring of the ball bearing.

6. The hydraulic pulse wrench calibration device according to claim 1, characterized in that, It also includes a torque wrench calibration device, which is installed on the mounting platform of the XY-axis displacement platform. The torque wrench calibration device includes a third simulated bolt unit, a second torque sensor, and a sensor support frame unit. The sensor support frame unit includes a mounting base plate, a support frame, a support lifting plate, a height adjusting screw, a left baffle, a right baffle, a support plate, and a compression spring. The mounting base plate is installed on the mounting platform of the XY-axis displacement platform, and the support frame is vertically fixed to the mounting base plate. The support lifting plate can be adjusted via the height adjusting screw. The second torque sensor is mounted on the support frame with a lifting mechanism. The left and right baffles are positioned opposite each other on the lifting support plate. The housing of the second torque sensor is located between the left and right baffles. The support plate is located between the left and right baffles. The lower surface of the housing of the second torque sensor rests on the support plate. The support plate is mounted on the lifting support plate with a guide shaft that allows it to move up and down. The compression spring is sleeved on the outer periphery of the guide shaft below the support plate. The two ends of the compression spring abut against the lower surface of the support plate and the upper surface of the lifting support plate, respectively.

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