A rotary multi-station synchronous bone dynamic system mechanical performance testing device

Abstract

This invention discloses a rotary multi-station synchronous mechanical performance testing device for a bone dynamic system, comprising several main units to be tested, a oscillating saw head and a drill bit to be tested, mounted on a traveling fixture, a tension-clearance measurement module, two speed-axial runout-torque measurement modules, and an oscillation angle measurement module; a rotary table device, two drill clamping devices, an oscillating saw clamping device, a pressing device for starting the main unit, an unlocking device for installing the drill bit or oscillating saw head on the main unit, a measurement module fixing plate, a pneumatic system, and a control module, etc. This invention achieves multi-station synchronous measurement by circumferentially arranging the traveling fixture on the rotary table device and circumferentially arranging the several measurement modules on the measurement module fixing plate, with the measurement modules located above the main units to be tested. This rational layout enables multi-station synchronous measurement, offering advantages such as simple structure, accurate measurement, and high efficiency. It requires only simple manual loading and unloading to achieve fully automated multi-station synchronous rapid measurement of the relevant mechanical performance parameters of the bone dynamic system.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and in particular relates to a rotating multi-station synchronous bone dynamic system mechanical performance testing device. Background Technology

[0002] Bone power systems are a general term for specialized medical devices used in orthopedic surgery to cut, drill, and enlarge human bones. These systems typically use a handheld power tool as the main unit, and achieve multiple functions such as drilling or cutting by quickly changing the corresponding power head, such as an oscillating saw power head or a drill power head. This is a common multi-functional integration method, widely used in orthopedic surgery due to its integrated functionality. Especially with the medical industry's promotion of disposable surgical instruments, these low-cost, high-efficiency, high-value-added, and high-safety multi-functional integrated handheld electric saw and drill bone power systems are becoming increasingly popular.

[0003] As a medical device, the handheld electric saw and drill power system, especially for surgical operations involving cutting and drilling in hard bone tissue, has stringent requirements for its mechanical performance. For example, the output speed at the saw / drill tip affects surgical efficiency; prolonged operation can lead to overheating and thermal damage to the bone and soft tissues, hindering postoperative healing. Insufficient torque from the power head prevents cutting or drilling; excessive axial runout during high-speed rotation results in enlarged, tapered holes. Excessive backlash or pull-out of the power head under tension is unacceptable. For instance, if the drill bit becomes stuck in the bone and detaches from the motor when removing it after drilling in bone surgery, it constitutes a serious and potentially disastrous medical accident. Therefore, rigorous and accurate measurement of the mechanical performance parameters is an essential process in the production of every handheld electric saw and drill power system. Automated testing significantly improves production efficiency and ensures product quality, avoiding the inaccuracies and inefficiencies of manual testing. Recently, Chinese patent application 202211448394.8 disclosed a semi-automatic measuring device for the mechanical performance parameters of an electric saw drill power system. The device includes a sliding platform I mounted on a support table, a traveling fixture fixed to the sliding platform I, several test units arrayed on the traveling fixture, a test swing saw head and a test drill bit, a sliding platform II fixed to a gantry frame and perpendicular to the movement direction of the sliding platform I, a tension-clearance measurement module, a speed-axial runout-torque measurement module, and a swing angle measurement module sequentially fixed to the sliding platform II, as well as a pneumatic system, a control module, and a data acquisition and storage module. This invention achieves automatic transport by manually loading and unloading the test system onto the traveling fixture (including manual loading and unloading of the test drill bit and swing saw head), combined with the sliding platform II to achieve semi-automatic measurement of tension-clearance, speed-axial runout-torque, and swing angle. However, due to the serial and semi-automatic nature of the process, the detection efficiency still needs improvement. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a rotary multi-station synchronous mechanical performance testing device for bone power systems. It only requires simple and convenient manual loading and unloading to achieve fully automated and multi-station synchronous measurement of tension-gap, speed-axis runout-torque, and swing angle of the electric saw drill bone power system, and completes the data storage and traceability of the measurement data.

[0005] The technical solution adopted in this invention is: a rotary multi-station synchronous bone power system mechanical performance testing device, including a support base, several test main units mounted on a traveling fixture, a test oscillating saw head, a test fast drill bit, and a test slow drill bit that can be poweredly connected to the test main units, a tension-clearance measurement module, two speed-axis runout-torque measurement modules, and an oscillation angle measurement module; it also includes a rotary table device, two drill clamping devices, an oscillating saw clamping device, a pressing device for pressing the start button of the test main unit, an unlocking device for installing drill bits or oscillating saw heads on the test main unit, a measurement module fixing plate, a data acquisition and storage module, and a pneumatic system. The control module includes a worm gear transmission box fixed to the base and driven by a motor, and a circular turntable coaxially fixed to the vertical worm gear output shaft. Seven identical accompanying fixtures are evenly arrayed along the circumference of the turntable's upper surface. Each accompanying fixture has several positioning grooves and cylindrical holes A for fixing the host machine under test, and cylindrical holes B for positioning and placing the slow drill bit under test, equal in number to the number of host machines under test. The measurement module's fixed plate includes a fixed disc fixed to the base and coaxially located directly above the turntable, a thrust bearing coaxially mounted on the upper surface of the turntable, and a rotating shaft with its two ends slidably connected to the fixed disc and the thrust bearing, respectively. In the top view of the turntable, the 270° position directly below the moving fixture is the manual loading area and the starting position. Along the bottom of the fixed disc, in a counter-clockwise direction with an interval angle of (360 / 7)°, are sequentially installed the following modules: a swing angle measurement module, a swing saw clamping device, a drill bit clamping device initially holding the drill bit to be tested, a drill bit clamping device initially without any drill bit, a speed-axis runout-torque measurement module, and a tension-clearance measurement module. These measurement modules are located directly above the main unit under test in each of the moving fixtures arrayed on the turntable. After being positioned downwards by a cylinder, the mechanical properties of the main unit under test are measured. A separate module is also installed between two drill bit clamping devices. It includes a speed-shaft runout-torque measurement module; pressing devices are installed next to the swing angle measurement module and the speed-shaft runout-torque measurement module below the fixed disc, allowing the start button of the host machine under test in the accompanying fixture directly below to be pressed during the measurement process; the control module controls the pneumatic system to realize the movement of the tension-clearance measurement module, the speed-shaft runout-torque measurement module and the swing angle measurement module, and controls the rotation of the worm gear transmission box to rotate the turntable to a suitable angle, so that the host machine under test in the accompanying fixture is moved to the measurement position, and controls the measurement implementation through the control module, transmitting the measurement data to the data acquisition and storage module.

[0006] In the aforementioned rotary multi-station synchronous bone power system mechanical performance testing device, the unlocking device includes two cylinders fixed in parallel to the accompanying fixture, a crossbar connected to the two cylinder rods, and several cylindrical sleeves fixed to the crossbar for pressing the unlocking sleeves of the host machine under test; the pressing device includes two double-rod cylinders A with the cylinder tail fixed to both ends of the fixed plate A and arranged vertically downwards in parallel, and a crossbar fixed to the piston rod of the double-rod cylinders A. The crossbar can simultaneously press down the start buttons of all the host machines under test in the accompanying fixture below it.

[0007] In the aforementioned rotary multi-station synchronous bone power system mechanical performance testing device, the swing saw clamping device includes a fixed plate B fixed to the lower surface of the fixed disc, two double-rod cylinders B fixed at both ends of the fixed plate B and arranged vertically downwards, a connecting plate B fixed to the piston rod end face of the double-rod cylinders B, and several pneumatic grippers B with flat fingers fixed to the lower surface of the connecting plate B in an array. The array spacing and number of the pneumatic grippers B are equal to the array spacing and number of the host machine under test in a single accompanying fixture. During operation, the swing saw head of each host machine under test is accurately gripped and disassembled by the pneumatic grippers B and placed in the receiving box of the accompanying fixture.

[0008] In the aforementioned rotary multi-station synchronous bone power system mechanical performance testing device, the drill bit clamping device includes a fixed plate C fixed to the lower surface of the fixed disc, two double-rod cylinders C with their tails fixed to both ends of the fixed plate C and arranged vertically downwards, a connecting plate C fixed to the piston rod end face of the double-rod cylinders C, several motors C with their axes vertically downwards arranged in an array fixed under the connecting plate C, and a pneumatic gripper C with two semi-circular fingers C fixed to the output shaft end of each motor C; the array spacing and number of the pneumatic gripper C are equal to the array spacing and number of the host machine under test in a single accompanying fixture. During operation, the fast drill bit or slow drill bit under test of each host machine under test is accurately gripped, installed, and removed by the pneumatic gripper C, and the circular hole formed by the two semi-circular fingers C is equal to the cylindrical surface of the drill bit and their axes coincide.

[0009] In the aforementioned rotary multi-station synchronous bone power system mechanical performance testing device, the swing angle measurement module includes a fixed plate IV fixed to a fixed disc, two double-rod cylinders IV fixed at both ends of the fixed plate IV and arranged vertically downwards, a support plate fixed to the piston rod end face of the double-rod cylinders IV, two double-rod cylinders III fixed to the support plate and whose piston rods are perpendicular to the piston rod movement direction of the double-rod cylinders IV, a translation plate fixed to the piston rod end face of the double-rod cylinders III, and several swing angle measurement sensors arrayed on the translation plate with the same number and spacing as the array spacing and number of the host machine under test in a single accompanying fixture; the swing angle measurement sensor is a photoelectric encoder, the outer shell of which is fixed on the translation plate, and during measurement, its rotating shaft end is coaxially pressed against the swing shaft end face of the swing saw head under test.

[0010] In the aforementioned rotary multi-station synchronous bone power system mechanical performance testing device, the speed-axis runout-torque measurement module includes a fixed plate II fixed to a fixed disc, two parallel vertically downward-aligned double-rod cylinders II fixed to both ends of the fixed plate II at the tail end of the cylinder body, a fixed plate III fixed to the piston rod end face of the double-rod cylinders II, and several measurement modules arrayed below the fixed plate III, with the same number and spacing as the main unit under test in a single accompanying fixture; the measurement module includes a fixed cover with a cavity structure fixed to the fixed plate III, a torque sensor, and speed measurement sensors and axis runout measurement sensors arranged from top to bottom on the side of the fixed cover; the bottom of the fixed cover has a cylindrical hole coaxially fitted with the cylindrical surface of the drill bit under test; the end of the cylindrical boss for measuring torque of the torque sensor has a straight protrusion, and the torque sensor is fixed to... The top of the fixed cover has a cylindrical boss coaxially facing the cylindrical hole of the fixed cover. When measuring torque, the protrusion matches the groove at the end of the drill bit to transmit torque. The speed measurement sensor consists of a light emitting module installed on one side of the fixed cover and a light receiver arranged on the other side of the fixed cover to receive the light emitted by the light emitting module. During measurement, the emitted light is directed from the side towards the groove at the end of the drill bit to be tested. The light receiver obtains the blocked and unblocked pulse signals to calculate the speed. The shaft runout measurement sensor is a light curtain width sensor, which includes a light curtain emitter and a receiver. The two are symmetrically arranged on both sides of the fixed cover and are visible to each other. During measurement, they are located on both sides of the journal of the drill bit to be tested. The emitted light curtain is vertical and slightly wider than the journal. The runout parameter is determined by the width of the light curtain received by the receiver when the journal rotates.

[0011] In the aforementioned rotary multi-station synchronous bone dynamic system mechanical performance testing device, the tension-gap measurement module includes a fixed plate I fixed to the fixed disc, several double-rod cylinders I mounted on the fixed plate I with the same array number, direction, and spacing as the host machine under test in a single accompanying fixture, and a gap measuring assembly fixed to the piston rod end of each double-rod cylinder I; the piston rods of each double-rod cylinder I are perpendicular to the fixed plate I and extend downwards; the gap measuring assembly includes an outer sleeve with a cavity and a fully open lower end fixed to the piston rod end face of the double-rod cylinder I, a pneumatic gripper with a cylinder body fixed to the inner top surface of the outer sleeve and two vertically downward fingers, semi-circular fingers respectively mounted on the two fingers, and a gap measuring sensor fixed to the outer surface of the outer sleeve; when the fingers of the pneumatic gripper are closed, the two semi-circular fingers coaxially clamp the cylindrical surface of the slow drill bit under test, applying vertical tension; the gap measuring sensor is a laser rangefinder sensor, emitting a laser perpendicular to the upper surface of the accompanying fixture and measuring the distance to that surface.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] The rotary multi-station synchronous mechanical performance testing device for bone power systems of the present invention has the advantages of simple structure, accurate measurement and high efficiency. It only requires simple and convenient manual loading and unloading to realize the fully automated and accurate implementation of tensile-clearance measurement, speed-axis runout-torque measurement and swing angle measurement of the electric saw drill bone power system. It avoids the uncertainty of manual measurement operation and the low efficiency of existing semi-automatic measurement. Moreover, the final measurement data can be stored and traced. Attached Figure Description

[0014] Figure 1 This is a top view of the station layout of the rotary multi-station synchronous bone power system mechanical performance testing device of the present invention.

[0015] Figure 2 This is a front view of the rotary multi-station synchronous bone dynamic system mechanical performance testing device of the present invention.

[0016] Figure 3 This is an isometric view of the mechanical performance testing device for the multi-station synchronous turntable bone power system of the present invention.

[0017] Figure 4 This is an isometric view of the host machine under test in the bone dynamics system of this invention.

[0018] Figure 5 This is an isometric view of the oscillating saw head under test that works in conjunction with the host unit in the bone dynamic system.

[0019] Figure 6 This is an isometric view of the slow drill bit under test that works in conjunction with the host machine in the bone dynamics system.

[0020] Figure 7 This is an isometric view of the accompanying fixture for fixing the host in this invention.

[0021] Figure 8 This is an isometric view of the pressing device used to press the start button of the host in this invention.

[0022] Figure 9 This is an isometric view of the swing angle measuring module used to measure the swing angle of the swing head in this invention.

[0023] Figure 10 This is an isometric view of the oscillating saw clamping device used to disassemble the oscillating head to be tested in this invention.

[0024] Figure 11 This is an isometric view of the fast drill bit to be tested and its drill clamping device in this invention.

[0025] Figure 12 This is an isometric view of the speed-shaft runout-torque measurement module in this invention.

[0026] Figure 13 for Figure 13 Partial cross-sectional view of the medium speed-shaft runout-torque measurement module.

[0027] Figure 14 This is an isometric view of the tension-gap measurement module in this invention.

[0028] In the diagram: 1-Base; 2-Turntable device; 201-Worm gear transmission box; 202-Turntable; 3-Traveling clamp; 301-Positioning groove; 302-Cylindrical hole A; 303-Cylindrical hole B; 304-Receiving box; 4-Main unit under test; 401-Positioning plane; 402-Unlocking sleeve; 403-Cylinder; 404-Start button; 405-Saw drill bit positioning hole; 5-Drill tool clamping device; 501-Fixing plate C; 502-Double rod cylinder C; 503-Connecting plate C 504-Motor C; 505-Pneumatic Hand Gripper C; 506-Semi-circular Finger C; 6-Tension-Gap Measurement Module; 601-Gap Measurement Sensor; 602-Semi-circular Finger; 603-Pneumatic Hand Gripper; 604-Outer Sleeve; 605-Double-rod Cylinder I; 606-Fixing Plate I; 7-Oscillating Saw Clamping Device; 701-Fixing Plate B; 702-Double-rod Cylinder B; 703-Connecting Plate B; 704-Pneumatic Hand Gripper B; 705-Flat Finger; 8-Speed-Axis Runout-Torque Measurement Measurement module; 801-Fixed plate II; 802-Double rod cylinder II; 803-Fixed plate III; 804-Speed ​​measurement sensor; 805-Fixed cover; 806-Shaft runout measurement sensor; 807-Torque sensor; 9-Swing angle measurement module; 901-Swing angle measurement sensor; 902-Translation plate; 903-Support plate; 904-Double rod cylinder III; 905-Double rod cylinder IV; 906-Fixed plate IV; 10-Pressing device; 101-Fixed plate A; 102-Double rod Cylinder A; 103-Crossbar; 11-Unlocking device; 12-High-speed drill bit to be tested; 13-Swing saw head to be tested; 131-Swing shaft; 132-Positioning cylinder I; 14-Slow drill bit to be tested; 141-Slotted groove; 142-Junior journal; 143-Cylindrical surface; 144-Positioning cylinder II; 15-Control module; 16-Data acquisition and storage module; 17-Pneumatic system; 18-Measurement module mounting plate; 181-Fixing disc; 182-Rotating shaft; 183-Thrust bearing. Detailed Implementation

[0029] The invention will now be further described with reference to the accompanying drawings.

[0030] First, the composition of the bone dynamic system under test and its measured parameters are introduced to better understand the functional composition and implementation process of this invention for measuring the mechanical performance parameters of the bone dynamic system. For example... Figure 4-6As shown, the bone power system under test includes a main unit 4, and a oscillating saw head 13, a fast drill bit 12, and a slow drill bit 14, all connected to the main unit. The main unit 4 is an electric tool with a built-in battery and motor assembly that outputs mechanical rotary motion. The main unit 4 has several geometric features for subsequent positioning and fixing, including a positioning plane 401 and a cylinder 403, a saw bit positioning hole 405 that mates with the oscillating saw head 13 and the drill bits (12, 14), and an unlocking sleeve 402 for installing and locking the drill bit or oscillating saw head. It also includes a start button 404 for initiating the rotational motion of the main unit. The main features of the swing saw head 13 to be tested include a swing shaft 131 that can swing back and forth and a positioning cylinder I 132 that matches the saw drill bit positioning hole 405 of the host 4 to achieve power connection. By installing the swing saw head 13 to be tested in the host 4, power can be transmitted to the swing shaft 131. During surgery, the doctor will fix a saw blade on the swing shaft 131 to achieve the back and forth swing of the saw blade to cut bone tissue. Therefore, the back and forth swing angle amplitude of the swing shaft 131 is one of the parameters that must be measured. The external features of the slow drill bit 14 and the fast drill bit 12 under test that cooperate with the host machine under test are the same. The difference between them lies in whether they have a speed reducer inside to achieve the difference in output speed. Their main positioning features are a positioning cylinder II 144 that matches the saw drill bit positioning hole 405 of the host machine under test 4 to achieve power connection, a non-rotatable cylindrical surface 143 for subsequent coaxial positioning, a journal 142 of the extended rotatable power output shaft, and a slotted groove 141 at the end of the shaft for transmitting torque to the special drill bit in surgery. The drill bit under test (12 or 14) can achieve the rotational movement of its output shaft when installed in the host machine under test 4. That is, the journal 142 and the slotted groove 141 rotate together. The other parts are the housing for fixing and connecting. The parameters that need to be measured for the fast-moving drill bit 12 under test include the rotational speed of the output shaft, the runout value of the journal position 142 when the output shaft rotates, and the stall torque used to characterize the output shaft of the bone power system. In addition to measuring the above-mentioned rotational speed, journal runout and torque parameters, the axial clearance value of the connection between the drill bit 14 under test and the host machine 4 under test is also required when the output shaft of the drill bit is subjected to a certain axial tension, so as to characterize its degree of inseparability.

[0031] like Figures 1 to 3As shown, the rotary multi-station synchronous bone power system mechanical performance testing device of the present invention includes a base 1 for support, several test main units 4 mounted on the accompanying clamp 3, a test oscillating saw head 13, a test fast drill bit 12, and a test slow drill bit 14 that can be poweredly connected to the test main units 4, a tension-clearance measurement module 6, two speed-axis runout-torque measurement modules 8, and an oscillation angle measurement module 9; it also includes a rotary device 2, two drill clamping devices 5, an oscillating saw clamping device 7, a pressing device 10 for pressing the start button 404 of the test main unit 4, and a device for mounting the drill bit (12 or 14) or the oscillating saw head 1 on the test main unit 4. The system includes an unlocking device 11, a measurement module fixing plate 18, a data acquisition and storage module 16, a pneumatic system 17, and a control module 15. The turntable device 2 includes a worm gear transmission box 201 fixed to the base 1 and driven by a motor, and a circular turntable 202 coaxially fixed to the vertical worm gear output shaft. Seven identical accompanying clamps 3 are evenly arrayed along the circumference of the upper surface of the turntable 202. Each accompanying clamp 3 has several positioning grooves 301 and cylindrical holes A302 for fixing the host machine 4 under test, and cylindrical holes B303 for positioning and placing the slow drill bit 14 under test, equal in number to the number of host machines 4 under test. Figure 7 The host device 4 under test is placed in the accompanying fixture and then tightened with locking screws from one side plate of the positioning groove 301, thus completely fixing the host device 4 under test. The measuring module fixing plate 18 includes a fixed disc 181 fixed to the base 1 and coaxially located directly above the turntable 202, a thrust bearing 183 coaxially mounted on the upper surface of the turntable 202, and a rotating shaft 182 whose two ends are slidably connected to the fixed disc 181 and the thrust bearing 183, respectively. Figure 1As shown, with the accompanying clamp 3 located 270° directly below the top view of the turntable 202 as the manual feeding area and starting position, along the bottom of the fixed disc 181 in a counterclockwise direction with an interval angle of (360 / 7)°, the following are sequentially installed: a swing angle measurement module 9, a swing saw clamping device 7, a drill tool clamping device 5 initially holding the fast drill bit 12 to be tested, a drill tool clamping device 5 initially not holding any drill bit, a speed-axis runout-torque measurement module 8, and a tension-clearance measurement module 6. These measurement modules are located directly above the host machine 4 to be tested on each of the accompanying clamps 3 arrayed on the turntable 202. After being positioned downwards by a cylinder, the mechanical properties of the host machine 4 to be tested are measured. A third measuring module is also installed between the two drill tool clamping devices 5. The speed-shaft runout-torque measurement module 8; pressing devices 10 are installed next to the swing angle measurement module 9 and the speed-shaft runout-torque measurement module 8 below the fixed disk 181, so that the start button 404 of the host machine 4 under test in the accompanying fixture 3 below can be pressed during the measurement process; the control module 15 controls the pneumatic system 17 to realize the movement of the tension-clearance measurement module 6, the speed-shaft runout-torque measurement module 8 and the swing angle measurement module 9, and controls the rotation of the worm gear transmission box 201 to make the turntable 202 rotate at a suitable angle, so that the host machine 4 under test in the accompanying fixture 3 is moved to the measurement position, and the measurement is implemented by the control module 15, and the measurement data is transmitted to the data acquisition and storage module 16.

[0032] like Figures 1-3 As shown, the unlocking device 11 includes two cylinders fixed side-by-side to the accompanying clamp, a crossbar connected to the two cylinder rods, and several cylindrical sleeves fixed to the crossbar for pressing the unlocking sleeves 402 of the host computer 4 under test. Figure 8 As shown, the pressing device 10 includes two double-rod cylinders A 102 with the cylinder tail fixed to both ends of the fixing plate A 101 and arranged vertically downwards, and a crossbar 103 fixed to the piston rod of the double-rod cylinders A 102. The crossbar 103 can press down simultaneously the start buttons 404 of all the host machines 4 to be tested in the accompanying fixture 3 below it.

[0033] like Figures 1-3 and Figure 10As shown, the swing saw clamping device 7 includes a fixed plate B 701 fixed to the lower surface of the fixed disc 181, two double-rod cylinders B 702 with the cylinder tail fixed to both ends of the fixed plate B 701 and arranged vertically downwards, a connecting plate B 703 fixed to the piston rod end face of the double-rod cylinders B 702, and several pneumatic grippers B 704 with flat fingers 705 fixed in an array to the lower surface of the connecting plate B 703. The array spacing and number of the pneumatic grippers B 704 are equal to the array spacing and number of the host machine 4 under test in a single accompanying fixture 3. During operation, the swing saw head 13 of each host machine 4 under test is accurately gripped and disassembled by the pneumatic grippers B 704 and placed in the receiving box 304 of the accompanying fixture 3.

[0034] like Figure 1 and Figure 11 As shown, the drill bit clamping device 5 includes a fixing plate C 501 fixed to the lower surface of the fixing disc 181, two double-rod cylinders C 502 with their tails fixed to both ends of the fixing plate C 501 and arranged vertically downwards, a connecting plate C 503 fixed to the piston rod end face of the double-rod cylinders C 502, several motors C 504 with their axes vertically downwards fixed in an array under the connecting plate C 503, and a pneumatic gripper C 505 with two semi-circular fingers C 506 fixed to the output shaft end of each motor C 504. The array spacing and number of the pneumatic grippers C 505 are equal to the array spacing and number of the host machines 4 under test in a single accompanying fixture 3. During operation, the fast drill bit 12 or slow drill bit 14 under test of each host machine 4 is accurately gripped, installed, and removed by the pneumatic gripper C 505, and the two semi-circular fingers C 506 are also fixed to the output shaft end of each motor C 504. The circular hole formed by the merging of 506 is equal to the cylindrical surface 143 of the drill bit (12 or 14) and their axes coincide.

[0035] like Figure 1 and Figure 9 As shown, the swing angle measurement module 9 includes a fixed plate Ⅳ906 fixed to the fixed disk 181, two double-rod cylinders Ⅳ905 fixed at both ends of the fixed plate Ⅳ906 and arranged vertically downwards, a support plate 903 fixed to the piston rod end face of the double-rod cylinders Ⅳ905, two double-rod cylinders Ⅲ904 fixed to the support plate 903 and whose piston rods are perpendicular to the piston rod movement direction of the double-rod cylinders Ⅳ905, a translation plate 902 fixed to the piston rod end face of the double-rod cylinders Ⅲ904, and a plurality of swing angle measurement sensors 901 arrayed on the translation plate 902 with a spacing equal to the array spacing of the host 4 under test in a single accompanying fixture 3; the swing angle measurement sensor 901 is a photoelectric encoder, the outer shell of which is fixed on the translation plate 902, and during measurement, the end of its rotating shaft is coaxially pressed against the end face of the swing shaft 131 of the swing saw head 13 under test.

[0036] like Figure 1 and Figures 12-13As shown, the speed-shaft runout-torque measurement module 8 includes a fixed plate II 801 fixed to a fixed disk 181, two double-rod cylinders II 802 fixed at both ends of the fixed plate II 801 and arranged vertically downwards, a fixed plate III 803 fixed to the piston rod end face of the double-rod cylinders II 802, and several measurement modules arrayed below the fixed plate III 803, with the same number and spacing as the host machine under test in a single accompanying fixture; the measurement module includes a fixed plate III The device includes a cavity-structured fixed cover 805, a torque sensor 807, and a speed measuring sensor 804 and a shaft runout measuring sensor 806 arranged from top to bottom on the side of the fixed cover 805. The bottom of the fixed cover 805 has a cylindrical hole that coaxially mates with the cylindrical surface of the drill bit under test. The end of the cylindrical boss of the torque sensor 807 has a slotted protrusion. The torque sensor 807 is fixed to the top of the fixed cover 805, and its cylindrical boss coaxially faces the cylindrical hole of the fixed cover. When measuring torque, the slotted protrusion matches the slotted groove 141 at the end of the drill bit (12 or 14) to transmit torque. Figure 13 As shown, the rotational speed measuring sensor 804 consists of a light emitting module mounted on one side of the fixed cover 805 and a light receiver arranged on the other side of the fixed cover to receive the light emitted by the light emitting module. During measurement, the emitted light beam is directed from the side towards the groove at the end of the drill bit under test. The light receiver obtains the blocked and unblocked pulse signals to calculate the rotational speed. The shaft runout measuring sensor 806 is a light curtain width measuring sensor, including a light curtain emitter and a receiver, which are symmetrically arranged on both sides of the fixed cover and visible to each other. During measurement, it is located on both sides of the journal of the drill bit under test. The emitted light curtain is vertical and slightly wider than the journal. The runout parameter is determined by the width of the light curtain received by the receiver when the journal rotates.

[0037] like Figure 1 and Figure 14As shown, the tension-gap measurement module 6 includes a fixed plate I 606 fixed to the fixed disk 181, several double-rod cylinders I 605 mounted on the fixed plate I 606 with the same array number, direction, and spacing as the host machine 4 under test in the single accompanying fixture 3, and a gap measuring assembly fixed to the piston rod end of each double-rod cylinder I 605; the piston rod of each double-rod cylinder I 605 is perpendicular to the fixed plate I 606 and extends downwards; the gap measuring assembly includes components fixed to the piston rod end of each double-rod cylinder I 605. The piston rod end face of 606 is fixed to an outer sleeve 604 with a cavity and a fully open lower end; a pneumatic gripper 603 with two vertically downward fingers fixed to the inner top surface of the outer sleeve 604; semi-circular fingers 602 respectively installed on the two fingers; and a gap measuring sensor 601 fixed to the outer surface of the outer sleeve. When the fingers of the pneumatic gripper 603 are closed, the two semi-circular fingers coaxially clamp the cylindrical surface 143 of the slow drill bit 14 to be tested, and apply vertical pulling force. The gap measuring sensor 601 is a laser rangefinder sensor that emits a laser perpendicular to the upper surface of the accompanying clamp 3 and measures the distance to the surface.

Claims

1. A rotating multi-station synchronous bone dynamic system mechanical performance testing device, characterized in that: The system includes a support base, several test units mounted on a traveling fixture, a test oscillating saw head, a test fast drill bit, and a test slow drill bit that can be poweredly connected to the test units, a tension-clearance measurement module, two speed-axis runout-torque measurement modules, and an oscillation angle measurement module; its key feature is that it also includes a turntable device, two drill clamping devices, an oscillating saw clamping device, a pressing device for pressing the start button of the test unit, an unlocking device for installing drill bits or oscillating saw heads on the test unit, a measurement module fixing plate, a data acquisition and storage module, a pneumatic system, and a control module; the turntable device includes components fixed to the base and driven by a motor. The system includes a worm gear transmission box and a circular turntable coaxially fixed to the vertical worm gear output shaft. Seven identical accompanying fixtures are evenly arrayed along the circumference of the turntable's upper surface. Each accompanying fixture has several positioning grooves and cylindrical holes A for fixing the host machine under test, and cylindrical holes B for positioning and placing the slow drill bit under test, an number equal to the number of host machines under test. The measurement module's fixed plate includes a fixed disc fixed to the base and coaxially located directly above the turntable, a thrust bearing coaxially mounted on the upper surface of the turntable, and a rotating shaft with its two ends slidably connected to the fixed disc and the thrust bearing, respectively. The measurement module is positioned 270° below the turntable in its top view. The accompanying fixtures are located in the manual loading area and are the starting position. Along the bottom of the fixed disc, in a counter-clockwise direction with an interval angle of (360 / 7)°, are sequentially installed the following modules: a swing angle measurement module, a swing saw clamping device, a drill bit clamping device initially holding the drill bit to be tested, a drill bit clamping device initially without any drill bit, a speed-axis runout-torque measurement module, and a tension-clearance measurement module. These measurement modules are positioned directly above the main unit under test in each of the accompanying fixtures arrayed on the turntable. After being positioned downwards by a cylinder, the mechanical properties of the main unit under test are measured. A speed-axis runout-torque measurement module is also installed between two drill bit clamping devices. The torque measurement module; pressing devices are installed next to the swing angle measurement module and the speed-shaft runout-torque measurement module below the fixed disc, so that the start button of the host machine under test in the accompanying fixture directly below can be pressed during the measurement process; the control module controls the pneumatic system to realize the movement of the tension-clearance measurement module, the speed-shaft runout-torque measurement module and the swing angle measurement module, and controls the rotation of the worm gear transmission box to rotate the turntable to a suitable angle, so as to move the host machine under test in the accompanying fixture to the measurement position, and controls the measurement to be carried out, and transmits the measurement data to the data acquisition and storage module.

2. The rotary multi-station synchronous bone dynamic system mechanical performance testing device according to claim 1, characterized in that: The unlocking device includes two cylinders fixed in parallel to the accompanying fixture, a crossbar connected to the two cylinder rods, and several cylindrical sleeves fixed to the crossbar for pressing the unlocking sleeves of the host under test; the pressing device includes two double-rod cylinders A with the cylinder tail fixed to both ends of the fixed plate A and arranged vertically downwards in parallel, and a crossbar fixed to the piston rod of the double-rod cylinders A. The crossbar can press down simultaneously the start buttons of all the host under test in the accompanying fixture below it.

3. The rotary multi-station synchronous bone dynamic system mechanical performance testing device according to claim 1, characterized in that: The aforementioned oscillating saw clamping device includes a fixed plate B fixed to the lower surface of a fixed disc, two double-rod cylinders B fixed at both ends of the fixed plate B and arranged vertically downwards, a connecting plate B fixed to the piston rod end face of the double-rod cylinders B, and several pneumatic grippers B with flat fingers fixed in an array to the lower surface of the connecting plate B. The array spacing and number of the pneumatic grippers B are equal to the array spacing and number of the host machines under test in a single accompanying fixture. During operation, the oscillating saw heads of each host machine under test are accurately gripped and disassembled by the pneumatic grippers B and placed in the receiving box of the accompanying fixture.

4. The rotary multi-station synchronous bone dynamic system mechanical performance testing device according to claim 1, characterized in that: The drill bit clamping device includes a fixed plate C fixed to the lower surface of a fixed disc, two double-rod cylinders C fixed at both ends of the fixed plate C and arranged vertically downwards, a connecting plate C fixed to the piston rod end face of the double-rod cylinders C, several motors C fixed in an array under the connecting plate C with their axes vertically downwards, and a pneumatic gripper C with two semi-circular fingers C fixed to the output shaft end of each motor C. The array spacing and number of the pneumatic gripper C are equal to the array spacing and number of the host machine under test in a single accompanying fixture. During operation, the fast or slow drill bit of each host machine under test is accurately gripped, installed, and removed by the pneumatic gripper C. The circular hole formed by the two semi-circular fingers C is equal to the cylindrical surface of the drill bit and their axes coincide.

5. The rotary multi-station synchronous bone dynamic system mechanical performance testing device according to claim 1, characterized in that: The swing angle measurement module includes a fixed plate IV fixed to a fixed disk, two double-rod cylinders IV fixed at both ends of the fixed plate IV and arranged vertically downwards, a support plate fixed to the piston rod end face of the double-rod cylinders IV, two double-rod cylinders III fixed to the support plate with their piston rods perpendicular to the piston rod movement direction of the double-rod cylinders IV, a translation plate fixed to the piston rod end face of the double-rod cylinders III, and several swing angle measurement sensors arrayed on the translation plate with the same number and spacing as the array spacing and number of the host machine under test in a single accompanying fixture; the swing angle measurement sensor is a photoelectric encoder, the outer shell of which is fixed on the translation plate, and during measurement, its rotating shaft end is coaxially pressed against the swing shaft end face of the swing saw head under test.

6. The rotary multi-station synchronous bone dynamic system mechanical performance testing device according to claim 1, characterized in that: The speed-shaft runout-torque measurement module includes a fixed plate II fixed to a fixed disk, two double-rod cylinders II fixed at both ends of the fixed plate II and arranged vertically downwards, a fixed plate III fixed to the piston rod end face of the double-rod cylinders II, and several measurement modules arrayed below the fixed plate III, with the same number and spacing as the main unit under test in a single accompanying fixture. The measurement module includes a fixed cover fixed to the fixed plate III and having a cavity structure, a torque sensor, and speed measurement sensors and shaft runout measurement sensors arranged from top to bottom on the side of the fixed cover. The bottom of the fixed cover has a cylindrical hole that mates coaxially with the cylindrical surface of the drill bit under test. The end of the cylindrical boss of the torque sensor has a straight protrusion. The torque sensor is fixed to the top of the fixed cover, and its cylindrical boss is coaxially facing the cylindrical hole of the fixed cover. When measuring torque, the straight protrusion matches the straight groove at the end of the drill bit under test to transmit torque.

7. The rotary multi-station synchronous bone dynamic system mechanical performance testing device according to claim 1, characterized in that: The tension-gap measurement module includes a fixed plate I fixed to a fixed disk, several double-rod cylinders I mounted on the fixed plate I with the same array number, direction, and spacing as the host machine under test in a single accompanying fixture, and a gap measuring assembly fixed to the piston rod end of each double-rod cylinder I; the piston rods of each double-rod cylinder I are perpendicular to the fixed plate I and extend downwards; the gap measuring assembly includes an outer sleeve with a cavity and a fully open lower end fixed to the piston rod end face of the double-rod cylinder I, a pneumatic gripper with a cylinder body fixed to the inner top surface of the outer sleeve and two vertically downward fingers, semi-circular fingers respectively mounted on the two fingers, and a gap measuring sensor fixed to the outer surface of the outer sleeve; when the fingers of the pneumatic gripper are closed, the two semi-circular fingers coaxially clamp the cylindrical surface of the slow drill bit under test, applying vertical tension; the gap measuring sensor is a laser rangefinder sensor, emitting a laser perpendicular to the upper surface of the accompanying fixture and measuring the distance to that surface.

8. The rotary multi-station synchronous bone dynamic system mechanical performance testing device according to claim 6, characterized in that: The speed measurement sensor consists of a light emitting module installed on one side of the fixed cover and a light receiver arranged on the other side of the fixed cover to receive the light emitted by the light emitting module. During measurement, the emitted light is directed from the side to the groove at the end of the drill bit being tested, and the light receiver obtains the blocked and unblocked pulse signals to calculate the speed.

9. The rotary multi-station synchronous bone dynamic system mechanical performance testing device according to claim 6, characterized in that: The aforementioned shaft runout measurement sensor is a light curtain width sensor, which includes a light curtain transmitter and a receiver, which are symmetrically arranged on both sides of the fixed cover and visible to each other. During measurement, the transmitter is located on both sides of the journal of the drill bit to be measured. The emitted light curtain is vertical and slightly wider than the journal. The runout parameter is determined by the width of the light curtain received by the receiver when the journal rotates.

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