Testing device

Abstract

The invention discloses a testing device, and relates to the technical field of testing devices.The testing device comprises a workbench, a positioning tool, a moving assembly, a distance measuring instrument, a lead screw ball assembly and a hysteresis brake, the positioning tool is installed on the workbench, the moving assembly comprises a sliding frame, a calibration piece, a nut and a force sensor, the sliding frame comprises a first support and a second support, and the first support and the second support are arranged on the workbench. The first support is connected with a moving block of a to-be-detected workpiece, the second support is slidably mounted on the workbench, the nut is connected with the second support, and the calibration piece is mounted on the first support or the second support and can slide along with the first support or the second support; the range finder is used for measuring the sliding distance of the calibration piece; the screw rod ball assembly comprises a screw rod and a ball arranged between the nut and the screw rod, and the nut is in threaded connection with the screw rod to drive the screw rod to rotate; the hysteresis brake is connected with the other end of the lead screw and used for providing resistance for preventing the lead screw from rotating. According to the invention, the displacement adjustment precision of the lens of the intelligent wearable device can be improved.

Description

Technical Field

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

[0002] In the adjustment process of smart wearable devices such as VR (Virtual Reality), interpupillary distance (IPD) is adjusted by a motor-driven moving block along a sliding axis. However, in related technologies, the actual adjustment distance of the lenses of smart wearable devices differs significantly from the ideal adjustment distance, resulting in low adjustment accuracy. Summary of the Invention

[0003] The main purpose of the present invention is to propose a testing device to solve the technical problem of low adjustment accuracy of lenses of smart wearable devices in the related art.

[0004] To achieve the above objectives, according to some embodiments of the present invention, the present invention provides a testing device, comprising: Workbench; A positioning tool, the positioning tool is installed on the workbench and is used to place the workpiece to be measured; A moving assembly, the moving assembly comprising a sliding frame, a calibration piece, a nut, and a force sensor, the sliding frame comprising a first bracket and a second bracket, the first bracket being connected to the moving block of the workpiece to be measured, the second bracket being slidably mounted on the workbench, the nut being connected to the second bracket, the calibration piece being mounted on the first bracket or the second bracket and being capable of sliding therewith; one end of the force sensor being connected to the first bracket, and the other end being connected to the second bracket; a distance meter, the distance meter being used to measure the sliding distance of the calibration piece; A screw-ball assembly, comprising a screw and a ball disposed between the nut and the screw, wherein the ball rolls in a groove formed by the nut and the screw, one end of the screw being rotatably mounted on the workbench, and the nut being threadedly connected to the screw to drive the screw to rotate; A hysteresis brake is connected to the other end of the screw rod, and the hysteresis brake is used to provide resistance to prevent the screw rod from rotating.

[0005] In some embodiments, the second bracket and the nut are integrally provided; or, the second bracket and the nut are separately provided.

[0006] In some embodiments, the movable assembly further includes a mounting seat and a threaded member, the mounting seat is provided with a first mounting hole and an elastic pin, the first bracket is provided with a positioning hole and a second mounting hole, the elastic pin passes through the positioning hole from the bottom of the first bracket and extends out of the first bracket, the threaded member is inserted into the first mounting hole and the second mounting hole to connect the mounting seat and the first bracket.

[0007] In some embodiments, a plurality of positioning holes are provided on the first bracket, and the elastic pin can be installed in any of the positioning holes.

[0008] In some embodiments, the second bracket includes a first sub-frame and a second sub-frame, the first sub-frame includes a base plate and a vertical plate arranged on the base plate, and the base plate is slidably connected to the workbench; the second sub-frame includes a connecting plate and two side plates respectively arranged at both ends of the connecting plate, the two side plates are respectively connected to one end of the vertical plate away from the base plate, and the side of the connecting plate away from the side plate is connected to the nut.

[0009] In some embodiments, the second sub-frame is spaced apart and parallel to the base plate, and the second sub-frame is arranged on a side of the base plate away from the workbench, and the sliding direction of the moving block, the sliding direction of the sliding frame and the moving direction of the nut are all the same; And / or, the vertical plate cooperates with the second sub-frame to form a through hole, the workbench includes a table top and a fixed plate, the fixed plate passes through the through hole from the table top, an axial hole is provided on the fixed plate, and one end of the screw rod is installed in the axial hole.

[0010] In some embodiments, the force sensor is connected to the first bracket and the vertical plate respectively, and the force sensor is used to detect the thrust of the moving block.

[0011] In some embodiments, a limit plate extending toward the first bracket is further provided on the bottom plate, and a gap is provided between the limit plate and the bottom surface of the first bracket facing the workbench. The limit plate is used to limit the distance that the first bracket moves downward toward the limit plate.

[0012] In some embodiments, the positioning tool is provided with a positioning groove and a positioning column, the positioning groove is used to accommodate the workpiece to be tested, and the positioning column is used to cooperate with the hole position of the workpiece to be tested. The testing device also includes a clamping tool, and the clamping tool includes a pressure plate and a pressure rod arranged on the pressure plate. The pressure plate is installed on the workbench to insert the pressure rod onto the positioning column.

[0013] In some embodiments, the moving assembly, the screw-ball assembly and the hysteresis brake are each in two groups and are connected one-to-one. The workpiece to be measured includes two moving blocks, and one moving assembly is connected to one moving block.

[0014] In the above scheme, the testing device includes a workbench, a positioning fixture, a moving component, a rangefinder, a screw-ball assembly and a hysteresis brake. The positioning fixture is installed on the workbench, and the positioning fixture is used to place the workpiece to be tested; the moving component includes a sliding frame, a calibration piece, a nut and a force sensor. The sliding frame includes a first bracket and a second bracket. The first bracket is connected to the moving block of the workpiece to be tested, and the second bracket is slidably installed on the workbench. The nut is connected to the second bracket. The calibration piece is installed on the first bracket or the second bracket and can slide therewith; one end of the force sensor is connected to the first bracket and the other end is connected to the second bracket; the rangefinder is used to measure the sliding distance of the calibration piece; the screw-ball assembly includes a screw and a ball arranged between the nut and the screw, the ball rolls in the groove formed by the nut and the screw, one end of the screw is rotatably installed on the workbench, and the nut is threadedly connected to the screw to drive the screw to rotate; the hysteresis brake is connected to the other end of the screw, and the hysteresis brake is used to provide resistance to prevent the screw from rotating. This invention utilizes a hysteresis brake to provide a constant load force by adjusting the current, simulating the resistance experienced by the moving block of the interpupillary distance adjustment module during movement. This improves the displacement adjustment accuracy of the lenses in smart wearable devices. A force sensor can also be used to control the driving force within a reasonable range. The actual displacement of the moving block can be measured using a calibration component and a rangefinder, and compared with the ideal displacement to test the displacement measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of a testing device according to an embodiment of the present invention; Figure 2 This is a schematic structural diagram of a testing device according to an embodiment of the present invention from one perspective; Figure 3 This is a schematic structural diagram of a nut and a screw-ball assembly of a testing device according to an embodiment of the present invention; Figure 4 This is a schematic structural diagram of a cross section of a nut and a screw-ball assembly of a testing device according to an embodiment of the present invention; Figure 5This is a schematic diagram of a portion of the structure of a testing device according to an embodiment of the present invention; Figure 6 This is a schematic diagram of another part of the structure of the testing device according to an embodiment of the present invention; Figure 7 This is a schematic structural diagram of a positioning pin and a mounting base of a testing device according to an embodiment of the present invention; Figure 8 This is another schematic diagram of the structure of a test device according to an embodiment of the present invention; Figure 9 This is a schematic structural diagram of the first sub-frame, lead screw and nut of the testing device according to an embodiment of the present invention; Figure 10 This is a schematic structural diagram of the first sub-frame and nuts of the testing device according to an embodiment of the present invention.

[0017] Description of Figure Numbers: 100, testing device; 200, workpiece to be tested; 210, moving block; 2. Workbench; 21. Fixing plate; 3. Positioning fixture; 31. Positioning column; 4. Sliding frame; 41. First bracket; 42. Second bracket; 421. First sub-frame; 4211. Bottom plate; 4212. Vertical plate; 4213. Limit plate; 422. Second sub-frame; 4221. Connecting plate; 42211. Mounting slot; 42212. Second connecting hole; 4222. Side plate; 423. Through hole; 5. Nut ;51. Screw connection part;52. Mounting part;521. First connecting hole;6. Force sensor;7. Distance meter;8. Screw rod;9. Ball;10. Slot body;11. Hysteresis brake;12. Mounting seat;121. Elastic space;13. Threaded part;14. Elastic pin;141. Spring;142. Pin body;15. Gap;16. Clamping fixture;161. Pressing plate;162. Pressing rod;17. Calibration part.

[0018] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0021] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] In the adjustment process of smart wearable devices such as VR (Virtual Reality), AR (Augmented Reality), and MR (Mixed Reality), pupil distance is adjusted by driving a moving block along a sliding axis via a motor. However, in related technologies, there is a large gap between the actual adjustment distance of the lens and the ideal adjustment distance, resulting in low adjustment accuracy.

[0023] After careful research, the applicant discovered that, for example, in VR, when a motor drives a moving block, the block experiences resistance, such as friction. This resistance causes a discrepancy between the actual displacement of the block and the desired displacement after the motor outputs driving force to the block, reducing adjustment accuracy. While those skilled in the art have sought to reduce this resistance, their success has been limited due to the complexity of generating system resistance and the difficulty of eliminating friction itself.

[0024] The applicant considered that, since system resistance is unavoidable, whether it is possible to acknowledge its existence and design a test device to test the displacement adjustment accuracy of the lens in the presence of resistance.

[0025] To this end, the applicant proposes a testing device.

[0026] See also Figure 1 and Figure 2According to some embodiments of the present invention, a testing device 100 is provided, comprising a workbench 2, a positioning fixture 3, a moving assembly, a rangefinder 7, a screw-ball assembly and a hysteresis brake 11, wherein the positioning fixture 3 is mounted on the workbench 2, and the positioning fixture 3 is used to place a workpiece 200 to be measured; the moving assembly comprises a sliding frame 4, a calibration piece 17, a nut 5 and a force sensor 6, the sliding frame 4 comprises a first bracket 41 and a second bracket 42, the first bracket 41 is connected to the moving block 210 of the workpiece 200 to be measured, the second bracket 42 is slidably mounted on the workbench 2, the nut 5 is connected to the second bracket 42, and the calibration piece 17 is mounted on the workbench 2. It is mounted on the first bracket 41 or the second bracket 42 and can slide therewith; one end of the force sensor 6 is connected to the first bracket 41, and the other end is connected to the second bracket 42; the rangefinder 7 is used to measure the sliding distance of the calibration piece 17; the screw-ball assembly includes a screw 8, and a ball 9 arranged between the nut 5 and the screw 8, the ball 9 rolls in the groove 10 formed by the nut 5 and the screw 8, one end of the screw 8 is rotatably mounted on the workbench 2, and the nut 5 is threadedly connected to the screw 8 to drive the screw 8 to rotate; the hysteresis brake 11 is connected to the other end of the screw 8, and the hysteresis brake 11 is used to provide resistance to prevent the screw 8 from rotating.

[0027] Reference Figure 1 and Figure 2 , the workbench 2 refers to the base on which the various components are placed. The workbench 2 can be placed on the work table, and the positioning tool 3 is used to position and place the workpiece 200 to be measured. If the workpiece 200 to be measured is a pupil distance adjustment module, the pupil distance adjustment module is a part of the smart wearable device, which is used to adjust the position of the lens. The pupil distance adjustment module includes a driving motor and a moving block 210 connected to the driving motor. The moving block 210 is connected to the frame, and the lens is arranged in the frame. Generally speaking, the number of the driving motor and the moving block 210 are both two and they are connected one to one. The moving block 210 can move along the axis. The two moving blocks 210 are respectively connected to the two frames, and are used to adjust the distance between the two lenses, which can also be said to be adjusting the pupil distance. The sliding frame 4 includes a first bracket 41 and a second bracket 42 that are connected to each other. The first bracket 41 is connected to the moving block 210 and can move under the drive of the moving block 210. The second bracket 42 is slidably installed on the workbench 2. The two ends of the force sensor 6 are respectively connected to the first bracket 41 and the second bracket 42. The force sensor 6 can measure the driving force of the driving motor on the moving block 210 to detect the driving force of the motor. The testing device 100 can judge whether the driving force is within the preset range based on the driving force value.

[0028] The rangefinder 7 can be fixedly mounted on the workbench 2. Specifically, the rangefinder 7 can be a laser displacer, and the measurement accuracy of the laser displacer is higher. The calibration member 17 refers to a component used for measurement by the rangefinder 7. Specifically, the calibration member 17 can be a vertical rod or a vertical plate. Generally speaking, the laser emitted by the laser rangefinder 7 is emitted horizontally, while the calibration member 17 is set vertically. The calibration member 17 can move with the sliding frame 4, and can be set on the first bracket 41 or on the second bracket 42. Because the first bracket 41 and the second bracket 42 move synchronously during the actual movement of the sliding frame 4, and because the sliding block is connected to the first bracket 41 and is used to drive the first bracket 41 to move, the actual movement displacement of the calibration member 17 is also the movement displacement of the moving block 210. In this way, the actual movement displacement of the moving block 210 can be measured by measuring the movement displacement of the calibration member 17.

[0029] Reference Figure 1 or Figure 2 In some embodiments, the number of moving assemblies, the screw-ball assembly, and the hysteresis brake 11 are each two, and they are connected in a one-to-one correspondence. The workpiece 200 to be measured includes two moving blocks 210, and one moving assembly is connected to each moving block 210. Since there are two moving blocks 210, there are also two corresponding moving assemblies, screw-ball assemblies, and hysteresis brakes 11, which are respectively used to provide a constant load force to the two moving blocks 210 and measure the actual displacement of the moving blocks 210, thereby detecting and adjusting the measurement accuracy.

[0030] Reference Figure 3 and Figure 4 The screw-ball assembly includes a screw 8 and a ball 9. The ball 9 rolls in a groove 10 formed by the nut 5 and the screw 8 to facilitate the relative rotation of the screw 8 and the nut 5. One end of the screw 8 is rotatably mounted on the workbench 2. An internal thread is provided in the hole of the nut 5, and the screw 8 is provided with an external thread connected to the internal thread. The second bracket 42 can drive the nut 5 to move along the central axis of the screw 8, and then drive the screw 8 connected to the nut 5 to rotate through the nut 5. A groove 10 is provided between the screw 8 and the nut 5, and the ball 9 is provided in the groove 10. The ball 9 can be a small steel ball coated with lubricating liquid. The provision of the ball 9 can reduce the friction resistance between the screw 8 and the nut 5, facilitate the relative rotation of the screw 8 and the nut 5, and realize the conversion between linear torque and rotational torque through the threaded connection design of the screw 8 and the nut 5.

[0031] The hysteresis brake 11 is connected to the other end of the lead screw 8. The hysteresis brake 11 is used to provide resistance to prevent the lead screw 8 from rotating. The hysteresis brake 11 can provide a constant resistance, which is used to simulate the resistance encountered by the moving block 210 of the pupil distance adjustment module during movement. In this way, the hysteresis brake 11 simulates the environment of the resistance encountered by the moving block 210, and the displacement of the moving block 210 during actual use can be measured. In this way, the displacement of the lens can be obtained, and the resistance provided by the hysteresis brake 11 is constant and will not change due to the movement of the moving block 210, which is conducive to improving the adjustment accuracy.

[0032] The principles of the hysteresis brake 11 and the screw-ball assembly are described as follows: For the hysteresis brake 11, the relationship between force and load torque is: T = n * I (Formula 1); Here, I is the drive current flowing into the hysteresis brake 11, n is the conversion factor, and T is the torque. Therefore, the load torque of the hysteresis brake 11 is proportional to the drive current. The hysteresis brake 11 can achieve contactless torque transmission, enabling smooth, stepless, and stable load torque control that is independent of speed.

[0033] For the screw 8 and the nut 5, the relationship between force and torque is: F = T * 2π / S / η (Formula 2); Where F is the driving force, η is the ball screw efficiency, S is the screw lead, and T is the torque. When nut 5 moves linearly to the left or right, screw 8 is driven to rotate clockwise or counterclockwise, thus converting linear motion into rotational motion and converting load torque into linear load force. Combining Equations 1 and 2, we can obtain: F=K*I; where K=n*2π / S / η It can be seen from the above formula that the driving current of the hysteresis brake 11 can be controlled by software to achieve adjustable load torque, that is, adjustable load force.

[0034] In the above-described embodiment of the present application, the provision of a hysteresis brake 11 allows for a constant and adjustable load force to be provided by adjusting the drive current, thereby simulating the resistance encountered by the moving block 210 of the interpupillary distance adjustment module during movement, thereby detecting and adjusting the displacement of the moving block 210, thereby improving the displacement adjustment accuracy of the lens. Furthermore, the driving force can be controlled within a reasonable range using the force sensor 6. The actual displacement of the moving block 210 can be measured using the calibration element 17 and the rangefinder 7, and compared with the ideal displacement to test the displacement measurement accuracy.

[0035] Reference Figure 5In some embodiments, the positioning fixture 3 is provided with a positioning groove and a positioning column 31. The positioning groove is used to accommodate the workpiece 200 to be measured, and the positioning column 31 is used to cooperate with the hole position of the workpiece 200 to be measured. The testing device 100 also includes a clamping fixture 16. The clamping fixture 16 includes a pressure plate 161 and a pressure rod 162 provided on the pressure plate 161. The pressure plate 161 is installed on the workbench 2 so that the pressure rod 162 is plugged into the positioning column 31. The workpiece 200 to be measured may have some holes or have a general or specific shape. When designing the fixture, some positioning grooves and positioning columns 31 can be designed according to the shape and structural characteristics of the workpiece 200 to be measured, so as to position the workpiece 200 to be measured. The clamping fixture 16 is movably installed. After the workpiece 200 to be measured is placed on the positioning fixture 3 and positioned, the clamping fixture 16 is pressed on the workpiece 200 to reduce the risk of movement of the workpiece 200 to be measured during the detection process. Specifically, the clamping tool 16 may include a pressing plate 161 and a pressing rod 162 . The pressing rod 162 is plugged into the positioning column 31 . The pressing plate 161 can rotate or move up and down or left and right to plug the pressing rod 162 installed thereon into the positioning column 31 for positioning.

[0036] Reference Figure 5 and Figure 6 In some embodiments, the moving assembly further includes a mounting seat 12 and a screw member 13. The mounting seat 12 is provided with a first mounting hole and an elastic pin 14. The first bracket 41 is provided with a positioning hole and a second mounting hole. The elastic pin 14 passes through the positioning hole from the bottom of the first bracket 41 and extends out of the first bracket 41. The screw member 13 penetrates the first mounting hole and the second mounting hole to connect the mounting seat 12 and the first bracket 41.

[0037] The mounting base 12 is a base that is connected to the first bracket 41 and can move together with the first bracket 41. Specifically, the mounting base 12 is arranged at the bottom of the first bracket 41, that is, below in the vertical direction. A first mounting hole is provided on the top of the mounting base 12. The positioning pin is used to connect with the moving block 210 to realize the positioning and installation of the moving block 210. The positioning pin can be an elastic pin 14 with elasticity. A positioning hole and a second mounting hole are provided on the first bracket 41. The elastic pin 14 passes through the positioning hole from the bottom of the first bracket 41 and extends a distance from the top of the first bracket 41 for connection with the moving block 210. The screw 13 is inserted into the first positioning hole and the second positioning hole to install the mounting base 12 on the first bracket 41, thereby realizing the connection between the first bracket 41 and the mounting base 12.

[0038] Reference Figure 5 and Figure 6, the number of elastic pins 14 here is generally two, and the two elastic pins 14 are respectively connected to the two moving blocks 210 of the pupil distance adjustment module. Since there may be deviations in the installation of the positioning fixture 3, or there may be deviations in the positioning position on the positioning fixture 3, or there may be deviations in the installation of the pupil distance adjustment module itself, the two moving blocks 210 may not be at the same height, that is, the bottom heights of the two moving blocks 210 along the vertical direction are inconsistent, or there is a certain degree of deviation in the vertical heights of the two moving blocks 210, so the positioning pins are set as elastic pins 14, and an elastic space 121 is set in the installation. The elastic pins 14 can be extended and retracted in the elastic space 121 along the vertical direction, thereby offsetting the deviation in the vertical height of the moving block 210. Compared with setting a positioning pin with a fixed position, it can reduce the damage caused by collision with the moving block 210, and can also accommodate the deviation in the height direction of the moving block 210. Specifically, referring to Figure 7 The elastic pin 14 may include a spring 141 disposed in the elastic space 121 and a pin body 142 mounted on one end of the spring 141, and the end of the pin body 142 away from the spring 141 is connected to the moving block 210. It should be noted that the vertical direction in this application is as follows: Figure 2 As shown by the arrow Y in the middle, the horizontal direction is Figure 2 Indicated by the arrow X.

[0039] In some embodiments, the first bracket 41 is provided with a plurality of positioning holes, and the elastic pin 14 can be installed in any of the positioning holes. The elastic pin 14 is provided in the previous embodiment to accommodate the height deviation of the two movable blocks 210 in the vertical direction. In this embodiment, a plurality of positioning holes are provided on the first bracket 41. If there is a deviation of the movable block 210 in a horizontal plane perpendicular to the vertical direction, or if there is a slight difference in the horizontal position of the movable block 210 of different models of interpupillary distance adjustment modules, the elastic pin 14 can be moved to the positioning hole corresponding to the installation position of the movable block 210 to achieve the connection between the elastic pin 14 and the movable block 210. The plurality of positioning holes is provided in this embodiment to overcome the position deviation of the movable block 210 in the horizontal plane.

[0040] Reference Figure 5 and Figure 8In some embodiments, the second bracket 42 and the nut 5 are integrally provided; or, the second bracket 42 and the nut 5 are separately provided. The integral setting here can be said to be integrally formed, or it can be not integrally formed, but the nut 5 and the second bracket 42 are set as a whole during production, such as by welding to form a whole, or by screwing them into a whole, and then the screw rod 8 is connected to the thread. The use of an integral setting can simplify the installation steps. Of course, the second bracket 42 and the nut 5 can also be set in a separate manner, so that the flexibility of installation can be improved, and the nut 5 can be installed on the screw rod 8 and then the second bracket 42 is installed, or the nut 5 can be installed on the second bracket 42 first, and then the nut 5 is connected to the screw rod 8. Those skilled in the art can make settings according to actual needs.

[0041] Reference Figure 8 In some embodiments, the second bracket 42 includes a first sub-frame 421 and a second sub-frame 422. The first sub-frame 421 includes a bottom plate 4211 and a vertical plate 4212 arranged on the bottom plate 4211. The bottom plate 4211 is slidably connected to the workbench 2, and the vertical plate 4212 is connected to the first bracket 41; the second sub-frame 422 includes a connecting plate 4221 and two side plates 4222 respectively arranged at both ends of the connecting plate 4221. The two side plates 4222 are respectively connected to one end of the vertical plate 4212 away from the bottom plate 4211, and the side of the connecting plate 4221 away from the side plate 4222 is connected to the nut 5.

[0042] The first sub-frame 421 is arranged below the second sub-frame 422. The bottom plate 4211 can be a horizontal plate, and the vertical plate 4212 is arranged above or at the top of the bottom plate 4211. The vertical plate 4212 can extend in the vertical direction. The bottom plate 4211 is used to be slidably connected to the workbench 2 and can slide along the workbench 2 under the drive of an external force. The second sub-frame 422 includes a connecting plate 4221 and two side plates 4222 arranged on the same side of the connecting plate 4221 and parallel to each other. The two side plates 4222 are respectively connected to the end of the vertical plate 4212 facing away from the bottom plate 4211. In this way, the first sub-frame 421 and the second sub-frame 422 are connected together and can move together. The side of the connecting plate 4221 facing away from the side plate 4222 is connected to the nut 5, so that the nut 5 can be driven to move in the same direction by the movement of the second bracket 42.

[0043] Reference Figure 8In some embodiments, the second sub-frame 422 is arranged in parallel with the base plate 4211, and the second sub-frame 422 is arranged on the side of the base plate 4211 away from the workbench 2, and the sliding direction of the moving block 210, the sliding direction of the sliding frame 4 and the moving direction of the nut 5 are all the same. The connecting plate 4221 is arranged vertically, the two side plates 4222 extend in the horizontal direction respectively, and the base plate 4211 is arranged horizontally. The sliding directions of the first sub-frame 421, the second sub-frame 422 and the moving block 210 are all horizontal, and the nut 5 also moves horizontally along the horizontally arranged screw rod 8. In this way, the moving direction of each component is not changed during the force transmission process, reducing the risk of inaccurate measurement caused by the torque component.

[0044] Reference Figure 8 In some embodiments, the vertical plate 4212 cooperates with the second sub-frame 422 to form a through hole 423. The workbench 2 includes a table top and a fixed plate 21. The fixed plate 21 passes through the through hole 423 from the table top. The fixed plate 21 is provided with an axial hole, and one end of the screw rod 8 is mounted in the axial hole. The fixed plate 21 is fixedly set on the table top and remains stationary during use. The number of fixed plates 21 can be two, and the two fixed plates 21 are arranged opposite each other, respectively, at the two ends of the screw rod 8. The two fixed plates 21 are provided with coaxial axial holes for mounting the screw rod 8 and ensuring that the screw rod 8 is arranged horizontally. The main purpose of providing the fixed plate 21 is also to mount the screw rod 8, and the screw rod 8 can rotate within the axial hole.

[0045] Reference Figure 8 In some embodiments, the force sensor 6 is connected to the first bracket 41 and the vertical plate 4212 respectively, and the force sensor 6 is used to detect the thrust of the moving block 210. The force sensor 6 is used to detect the thrust exerted on the moving block 210. Specifically, the driving motor drives the moving block 210 to move, and the movement of the moving block 210 drives the first bracket 41 connected to the moving block 210 to move. The two ends of the force sensor 6 are respectively connected to the first bracket 41 and the second bracket 42. Through the connection of the force sensor 6, the first bracket 41 drives the second bracket 42 to move together. At the same time, the force sensor 6 can measure the force between the first bracket 41 and the second bracket 42, thereby obtaining the thrust of the moving block 210, thereby judging whether the thrust is within the preset range.

[0046] Reference Figure 8 In some embodiments, a limiting plate 4213 extending toward the first bracket 41 is further provided on the bottom plate 4211, and a gap 15 is provided between the limiting plate 4213 and the bottom surface of the first bracket 41 facing the workbench 2. The limiting plate 4213 is used to limit the distance that the first bracket 41 moves downward toward the limiting plate 4213.

[0047] The limiting plate 4213 is arranged on the side of the bottom plate 4211 facing the first bracket 41. The bottom plate 4211 is located below the first bracket 41. The limiting plate 4213 extends toward the first bracket 41 and does not exceed the first bracket 41. Specifically, a gap 15 is provided between the top surface of the limiting plate 4213 and the bottom surface of the first bracket 41. With such a configuration, if the moving block 210 experiences vertical fluctuations during the detection process, the first bracket 41 will hit the limiting plate 4213 when the vibration is too large, and the limiting plate 4213 can play a limiting role. The gap 15 between the first bracket 41 and the limiting plate 4213 is provided to avoid friction between the first bracket 41 and the limiting plate 4213 during the movement of the first bracket 41 during normal use, thereby increasing the sliding resistance. If a resistance is added, the displacement measurement accuracy of the moving block 210 will also be affected.

[0048] Reference Figure 9 and Figure 10 In some embodiments, a mounting groove 42211 is provided on the connecting plate 4221, and the nut 5 includes a threaded portion 51 and a mounting portion 52 installed on the outer periphery of the threaded portion 51. The threaded portion 51 is installed in the mounting groove 42211, and the threaded portion 51 is provided with an internal thread threadedly connected to the screw rod 8. The mounting portion 52 is provided with a first connecting hole 521, and a second connecting hole 42212 is also provided on the connecting plate 4221. The threaded connection between the mounting portion 52 and the connecting plate 4221 is achieved by setting a screw through the first connecting hole 521 and the second connecting hole 42212.

[0049] The above are merely exemplary embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's description and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A testing device, characterized in that: include: Workbench; A positioning tool, the positioning tool is installed on the workbench and is used to place the workpiece to be measured; A moving assembly, the moving assembly comprising a sliding frame, a calibration piece, a nut, and a force sensor, the sliding frame comprising a first bracket and a second bracket, the first bracket being connected to the moving block of the workpiece to be measured, the second bracket being slidably mounted on the workbench, the nut being connected to the second bracket, the calibration piece being mounted on the first bracket or the second bracket and being capable of sliding therewith; one end of the force sensor being connected to the first bracket, and the other end being connected to the second bracket; a distance meter, the distance meter being used to measure the sliding distance of the calibration piece; A screw-ball assembly, comprising a screw and a ball disposed between the nut and the screw, wherein the ball rolls in a groove formed by the nut and the screw, one end of the screw being rotatably mounted on the workbench, and the nut being threadedly connected to the screw to drive the screw to rotate; A hysteresis brake is connected to the other end of the screw rod, and the hysteresis brake is used to provide resistance to prevent the screw rod from rotating.

2. The testing device according to claim 1, wherein: The second bracket and the nut are integrally provided; or, the second bracket and the nut are separately provided.

3. The testing device according to claim 1, wherein: The movable assembly also includes a mounting seat and a threaded member, the mounting seat is provided with a first mounting hole and an elastic pin, the first bracket is provided with a positioning hole and a second mounting hole, the elastic pin passes through the positioning hole from the bottom of the first bracket and extends out of the first bracket, the threaded member is inserted into the first mounting hole and the second mounting hole to connect the mounting seat and the first bracket.

4. The testing device according to claim 3, wherein: The first bracket is provided with a plurality of positioning holes, and the elastic pin can be installed in any of the positioning holes.

5. The testing device according to claim 1, wherein: The second bracket includes a first sub-frame and a second sub-frame, the first sub-frame includes a base plate and a vertical plate arranged on the base plate, and the base plate is slidably connected to the workbench; the second sub-frame includes a connecting plate and two side plates respectively arranged at both ends of the connecting plate, the two side plates are respectively connected to one end of the vertical plate away from the base plate, and the side of the connecting plate away from the side plate is connected to the nut.

6. The testing device according to claim 5, wherein: The second sub-frame is spaced apart and parallel to the base plate, and the second sub-frame is arranged on a side of the base plate away from the workbench, and the sliding direction of the moving block, the sliding direction of the sliding frame and the moving direction of the nut are all the same; And / or, the vertical plate cooperates with the second sub-frame to form a through hole, the workbench includes a table top and a fixed plate, the fixed plate passes through the through hole from the table top, an axial hole is provided on the fixed plate, and one end of the screw rod is installed in the axial hole.

7. The testing device according to claim 5, wherein: The force sensor is connected to the first bracket and the vertical plate respectively, and is used to detect the thrust of the moving block.

8. The testing device according to claim 7, wherein: The bottom plate is further provided with a limit plate extending toward the first bracket, a gap is provided between the limit plate and the bottom surface of the first bracket facing the workbench, and the limit plate is used to limit the distance that the first bracket moves downward toward the limit plate.

9. The testing device according to any one of claims 1 to 5, characterized in that: The positioning tool is provided with a positioning groove and a positioning column, the positioning groove is used to accommodate the workpiece to be tested, and the positioning column is used to cooperate with the hole position of the workpiece to be tested. The testing device also includes a clamping tool, and the clamping tool includes a pressure plate and a pressure rod arranged on the pressure plate. The pressure plate is installed on the workbench to insert the pressure rod onto the positioning column.

10. The testing device according to any one of claims 1 to 5, characterized in that The moving components, the screw-ball components and the hysteresis brake are each in two groups and are connected in one-to-one correspondence. The workpiece to be measured includes two moving blocks, and one moving component is connected to one moving block.

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