A semi-automatic measuring device for mechanical performance parameters of a power system of an electric saw for drilling bones

Abstract

The application discloses a kind of electric saw drill bone power system mechanical performance parameter semi-automatic measuring device, including installation in the sliding platform I of support table, fixed in the travelling fixture of sliding platform I, array installation on the several mainframes of travelling fixture, to be measured swing saw head and to be measured drill, fixed in portal frame and with the sliding platform II of movement direction vertical of sliding platform I, tension-gap measurement module, rotational speed-shaft runout-torque measurement module and swing angle measurement module are successively and parallel fixed on sliding platform II, and pneumatic system, control module, data acquisition and storage module.The application is installed on travelling fixture by simple artificial feeding and discharging to realize automatic transport, and the automation of tension-gap measurement, rotational speed-shaft runout-torque measurement and swing angle measurement etc. process is realized in combination with sliding platform II, with the advantages of simple structure, accurate measurement and high efficiency, and measurement data can realize storage and traceability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of medical instruments, and particularly relates to a semi-automatic measuring device for mechanical performance parameters of an electric saw-drill bone power system. BACKGROUND

[0002] A bone power system is a general term of special medical instruments for cutting, drilling, reaming and other operations on human bones in orthopedic surgery. Among them, a handheld electric tool is used as a host, and a corresponding power head is quickly replaced to realize drilling or cutting and other functions in surgery, such as a swing saw power head or a drill power head. This is a common multifunctional integrated mode, which is widely used in orthopedic surgery due to the realization of functional integration. Especially with the implementation of the concept of disposable surgical instruments in the medical industry, these multifunctional integrated handheld electric saw-drill bone power systems with low cost, high efficiency, high added value and high safety are more popular.

[0003] As a kind of medical instrument equipment, the handheld electric saw-drill bone power system, especially for cutting and drilling operations on hard bone tissue, has strict requirements for the mechanical performance of the equipment. For example, the output rotational speed of the saw-drill tip will affect the operation efficiency, and long-time starting will cause overheating and affect the thermal damage of bone soft tissue, making it difficult to heal after surgery. If the torque output by the power head is too small, it will not be able to cut or drill. If the shaft jump of the power head under high-speed rotation is too large, it will lead to the expansion of the drilling size and the formation of a conical hole. It is not allowed for the power head to have a large gap under tension or be pulled out, such as when the drill bit is pulled out after drilling in bone surgery, which causes the drill bit to be stuck in the bone and separated from the electric host, which is a serious and terrible medical accident. Therefore, for each handheld electric saw-drill bone power system leaving the factory, it is necessary to strictly and accurately measure its mechanical performance parameters, so it is particularly important to invent a mechanical performance parameter measuring device for the handheld electric saw-drill bone power system, which can quickly and accurately measure the mechanical performance parameters of the handheld electric saw-drill bone power system. This can significantly improve the production efficiency of enterprises and ensure product quality, and avoid the inaccuracy and inefficiency of manual detection. SUMMARY

[0004] In order to solve the above technical problems, the application provides a semi-automatic measuring device for mechanical performance parameters of an electric saw-drill bone power system, which realizes the automation of tension-gap measurement, rotational speed-shaft jump-torque measurement and swing angle measurement of the electric saw-drill bone power system through simple and convenient manual feeding and discharging, and realizes the storage and tracing of measurement data.

[0005] The technical scheme adopted by the present application is: a kind of electric saw drill bone power system mechanical performance parameter semi-automatic measuring device, including the base with support platform, sliding platform I installed on support platform, sliding platform I on the slide of fixed follow-up fixture, a plurality of measured main machine are fixed in follow-up fixture along the array of sliding platform I movement direction, with the measured main machine matching the measured measured swing saw head and measured drill, gantry is installed on support platform and with the vertical of sliding platform I movement direction, sliding platform II is fixed in gantry and with the vertical of sliding platform I movement direction, tension-gap measurement module, rotational speed-shaft runout-torque measurement module and swing angle measurement module are fixed in sliding platform II from left to right in turn, and pneumatic system, control module, data acquisition and storage module;

[0006] The swing angle measurement module includes a fixed plate IV fixed on the slide II, two double-rod cylinders IV fixed on both ends of the fixed plate IV and vertically downward, a support plate fixed to the end face of the piston rod of the double-rod cylinder IV, two double-rod cylinders III fixed to the support plate and perpendicular to the movement direction of the piston rod of the double-rod cylinder IV, a translational plate fixed to the support plate and perpendicular to the movement direction of the piston rod of the double-rod cylinder IV, and a plurality of swing angle measurement sensors arrayed on the translational plate with equal spacing to the array spacing of the measured main machine.

[0007] The rotational speed-shaft runout-torque measurement module includes a fixed plate II fixed on the slide II, two double-rod cylinders II fixed on both ends of the fixed plate II and vertically downward, a fixed plate III fixed to the end face of the piston rod of the double-rod cylinder II, and a plurality of measurement modules arrayed below the fixed plate III with equal spacing to the number and spacing of the measured main machine. The measurement module includes a fixed cover fixed to the fixed plate III and having a cavity structure, a torque sensor, a rotational speed measurement sensor and a shaft runout measurement sensor arranged from top to bottom on the side of the fixed cover. The bottom of the fixed cover is provided with a cylindrical hole coaxially matched with the cylindrical surface of the measured drill. The end of the cylindrical boss of the torque sensor is provided with a one-bar protrusion. The torque sensor is fixed to the top end of the fixed cover with its cylindrical boss coaxially facing the cylindrical hole of the fixed cover. The one-bar protrusion matches the one-bar groove at the end of the measured drill to transmit torque during torque measurement.

[0008] The tension-gap measuring module comprises a fixed plate I fixed below the slider II, a plurality of double-rod air cylinders I installed on the fixed plate I and equal in array number, direction and interval to the host to be measured, and a gap measuring assembly fixed with the piston rod end of each double-rod air cylinder I; the piston rod of each double-rod air cylinder I is perpendicular to the fixed plate I and extends downward; the gap measuring assembly comprises an outer sleeve with a cavity and a fully open lower end fixed with the piston rod end face of the double-rod air cylinder I, a cylinder body fixed to the inner top surface of the outer sleeve and having two vertical downward pneumatic hand grips, semicircular fingers respectively installed on the two hand grips, and a gap measuring sensor fixed on the outer surface of the outer sleeve; when the fingers of the pneumatic hand grips are closed, the two semicircular fingers coaxially clamp the cylindrical surface of the drill tool to be measured to implement vertical tension; the gap measuring sensor is a laser ranging sensor, and the emitted laser is perpendicular to the upper surface of the positioning mold of the following clamp and measures the distance from the surface.

[0009] In the above-mentioned semi-automatic measuring device for mechanical performance parameters of the electric saw drill bone power system, the rotation speed measuring sensor comprises 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 at the linear groove at the end of the drill tool to be measured, and the rotation speed is calculated based on the pulse signals obtained by the light receiver in the shielded and unshielded states.

[0010] In the above-mentioned semi-automatic measuring device for mechanical performance parameters of the electric saw drill bone power system, the surface of the rotating shaft of the drill tool to be measured is pasted with a reflective paper, and the rotation speed measuring sensor is an optical rotation speed measuring sensor, which calculates the rotation speed by collecting the reflection signals of the emitted light on the reflective paper.

[0011] In the above-mentioned semi-automatic measuring device for mechanical performance parameters of the electric saw drill bone power system, the rotation speed measuring sensor is a light curtain width measuring sensor, which comprises a light curtain emitter and a receiver, both of which are symmetrically arranged on the two sides of the fixed cover and can see each other, and during measurement, the emitted light curtain is perpendicular to and slightly wider than the shaft neck, and the jump parameter is determined by the width of the light curtain received by the receiver when the shaft neck rotates.

[0012] In the above-mentioned semi-automatic measuring device for mechanical performance parameters of the electric saw drill bone power system, the rotation speed measuring sensor is a mechanical dial gauge with digital display and storage function, and the mechanical gauge head extends vertically to contact the shaft neck to measure the jump parameter.

[0013] In the above-mentioned semi-automatic measuring device for the mechanical performance parameters of the electric saw and drill bone power system, the accompanying fixture includes a positioning mold and a locking screw; the positioning mold is provided with a host positioning circular hole that is coaxially positioned with the cylindrical feature of the host to be measured, and a positioning groove composed of two rectangular blocks for clamping the left and right positioning planes of the host to be measured; after the host to be measured is placed on the positioning mold, the locking screw is used to tighten it from a side plate of the positioning groove.

[0014] In the above-mentioned semi-automatic measuring device for the mechanical performance parameters of the electric saw drill bone power system, the control module controls the pneumatic system to realize the movement of the tension-gap measurement module, the speed-shaft runout-torque measurement module and the swing angle measurement module, the sliding platform I and the sliding platform II, and controls the measurement implementation through the control module, and transmits the measurement data to the data acquisition and storage module.

[0015] The semi-automatic measurement device for the mechanical performance parameters of an electric saw-drill bone power system of the present invention has a simple structure, accurate measurement, and high efficiency. Through simple and convenient manual loading and unloading, the main machine to be tested, its swing saw head to be tested, and the array of drill tools to be tested are mounted on the accompanying fixture of sliding platform I. Automatic transportation is achieved via sliding platform I, and combined with sliding platform II, the corresponding parameter measurement processes of the tension-gap measurement module, the speed-shaft runout-torque measurement module, and the swing angle measurement module are automated. The overall efficiency is high, the measurement is accurate, and the uncertainties of manual measurement operations are avoided. Furthermore, the final measurement data can be stored and traced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the semi-automatic measuring device for the mechanical performance parameters of the electric bone saw power system of the present invention.

[0017] Figure 2 This is a front view of the semi-automatic parameter measurement device for the mechanical properties of the bone dynamic system of the present invention.

[0018] Figure 3 For primary display Figure 1 Axonometric view of the swing angle measurement module.

[0019] Figure 4 This is an axonometric diagram of the host machine to be tested in the bone power system to be tested in the present invention.

[0020] Figure 5 This is an axonometric view of the oscillating saw head to be tested, which cooperates with the main machine in the bone power system to be tested.

[0021] Figure 6 This is an axonometric view of the drill tool to be tested that cooperates with the main machine in the bone power system to be tested.

[0022] Figure 7 This is an axonometric diagram of the speed-shaft runout-torque measurement module in the measurement device of the present invention.

[0023] Figure 8 is a partial sectional view of the rotational speed-shaft runout-torque measurement module.

[0024] Figure 9 is an axonometric view of the traveling fixture for fixing the main machine in the present application.

[0025] Figure 10 is an axonometric view of the tension-gap measurement module in the measuring device of the present application.

[0026] In the figure: 1 - machine base; 101 - support table; 2 - sliding platform I; 3 - traveling fixture; 301 - positioning mold; 3011 - positioning groove; 3012 - main machine positioning round hole; 3013 - groove; 3014 - threaded hole; 302 - locking screw; 4 - main machine to be measured; 401 - positioning plane; 402 - saw drill bit positioning hole; 403 - cylinder; 5 - gantry frame; 6 - tension-gap measurement module; 601 - gap measurement sensor; 602 - semicircular finger; 603 - pneumatic hand grab; 604 - outer sleeve; 605 - double-rod pneumatic cylinder I; 606 - fixed plate I; 7 - sliding platform II; 701 - sliding block II; 8 - rotational speed-shaft runout-torque measurement module; 801 - fixed plate II; 802 - double-rod pneumatic cylinder II; 803 - fixed plate III; 804 - rotational speed measurement sensor; 805 - fixed cover; 806 - rotational shaft runout measurement sensor; 807 - torque sensor; 9 - swing angle measurement module; 901 - swing angle measurement sensor; 902 - translational plate; 903 - support plate; 904 - double-rod pneumatic cylinder III; 905 - double-rod pneumatic cylinder IV; 906 - fixed plate IV; 10 - control module; 11 - data acquisition and storage module; 12 - pneumatic system; 13 - swing saw head to be measured; 131 - swing shaft; 132 - positioning cylinder I; 14 - drill to be measured; 141 - slot; 142 - journal; 143 - cylindrical surface; 144 - positioning cylinder II. DETAILED DESCRIPTION

[0027] The present application will be further described below in conjunction with the accompanying drawings.

[0028] First, the composition of the handheld electric saw drill bone power system to be measured and its measured parameter indicators are introduced, which are used for better understanding the functional composition and implementation process of the present application for measuring the mechanical performance parameters of the bone power system. For example, Figures 4-6As shown, the to-be-tested electric saw drill is composed of a to-be-tested main machine 4, a to-be-tested swing saw head 13 and a to-be-tested drill tool 14. The to-be-tested main machine 4 is an electric tool with a battery and a motor assembly, and the output is a mechanical rotary motion. The to-be-tested main machine 4 has some geometric features for subsequent positioning and fixing the to-be-tested main machine, including a positioning plane 401, a cylinder 403, and a saw drill head positioning hole 402 matched with the to-be-tested swing saw head 13 and the to-be-tested drill tool 14. The to-be-tested swing saw head 13 includes a swing shaft 131 that can swing back and forth, and a positioning cylinder I 132 matched with the saw drill head positioning hole 402 of the to-be-tested main machine 4 to realize power connection. The to-be-tested swing saw head 13 is installed in the to-be-tested main machine 4 to realize power transmission to the swing shaft 131. During the operation, the surgeon will clamp and fix a saw blade on the swing shaft 131 to realize the back-and-forth swinging cutting of the saw blade. Therefore, the back-and-forth swinging angle amplitude of the swing shaft 131 is one of the parameters that must be measured. The to-be-tested drill tool 14 has a positioning cylinder II 144 matched with the saw drill head positioning hole 402 of the to-be-tested main machine 4 to realize power connection, a non-rotatable cylindrical surface 143 for subsequent coaxial positioning, a rotatable power output shaft neck 142, and a one-slot groove 141 provided at the end of the shaft for subsequent transmission of torque to the special drill head during the operation. The to-be-tested drill tool 14 is installed in the to-be-tested main machine 4 to realize the rotary motion of the output shaft, i.e. the shaft neck 142 and the one-slot groove 141 rotate together, and the other parts are fixed and connected with the shell. The parameters to be measured include the rotation speed of the output shaft, the jump value of the shaft neck 142 position when the output shaft rotates, the stall torque value of the output shaft for representing the saw drill capacity, and the axial gap value between the to-be-tested drill tool 14 and the to-be-tested main machine 4 under the action of a certain pulling force in the axial direction of the output shaft, to represent the inseparable degree index.

[0029] As Figure 1 and Figure 2As shown in the figure, the hand-held electric saw drill bone power system mechanical performance parameter measuring device of the application comprises: a base 1 composed of four legs standing on the ground to support a support table 101, a sliding platform I 2 fixed on the support table 101, a following clamp 3 fixed on the sliding block of the sliding platform I 2, a plurality of to-be-tested main machines 4 arrayed on the following clamp 3 along the sliding direction of the sliding block of the sliding platform I 2, a gantry 5 installed on the support table 101 perpendicular to the sliding direction of the sliding block of the sliding platform I 2, a sliding platform II 7 fixed on the gantry 5 perpendicular to the sliding direction of the sliding block of the sliding platform I 2, comprising a sliding block II 701 that can move back and forth left and right, a tension-gap measuring module 6, a rotating speed-shaft runout-torque measuring module 8 and a swing angle measuring module 9 fixed on the sliding block II 701 in sequence from left to right, a to-be-tested swing saw head 13 and a to-be-tested drill 14 matched with the to-be-tested main machine 4 for detecting the relevant parameters, a pneumatic system 12 for driving the cylinders in the corresponding measuring modules to move, a control module 10 for controlling the movement of the measuring modules, the parameter measurement and the positioning of the sliding platform, and a data acquisition and storage module 11 for acquiring and storing the relevant mechanical performance parameters.

[0030] As shown in the figure, Figure 9 The following clamp 3 for fixing the main machine comprises a positioning die 301 and a locking screw 302, wherein the positioning die 301 comprises a main machine positioning hole 3012 for coaxial positioning with the cylinder 403 of the to-be-tested main machine 4, a positioning groove 3011 composed of two rectangular blocks for clamping the left and right positioning planes 401 of the to-be-tested main machine 4, and a groove 3013 below the upper plane of the positioning die 301 for avoiding interference of the handheld part during installation of the to-be-tested main machine 4; the to-be-tested main machine 4 is positioned on the positioning die 301 through cylindrical pair cooperation and plane clamping cooperation, and then a locking screw 302 is tightened from one side plate of the positioning groove 3011 of the positioning die 301, so that the to-be-tested main machine 4 is tightly clamped on the following clamp 3, and the following clamp 3 is arrayed with a plurality of such positioning features, thereby achieving clamping and positioning of a plurality of to-be-tested main machines 4, as shown in the figure. Figure 9 As shown in the figure, it is a following clamp that can install four to-be-tested main machines.

[0031] As shown in the figure, Figures 1 to 3As shown, the traveling fixture 3 is fixed on the sliding block of the reciprocating linearly movable sliding platform 12; the array direction of the to-be-tested main machine 4 is the same as the sliding direction of the sliding block of the sliding platform 12; the swing angle measurement module 9 is fixed on the sliding block 701, which is used for measuring the swing angle of the swing saw head 13 installed on the to-be-tested main machine 4. The swing angle measurement module 9 comprises a long strip-shaped fixed plate 906 fixedly connected with the sliding block 701, two double-rod air cylinders 905 (the cylinder body is fixedly connected with the fixed plate 906) installed side by side at both ends of the fixed plate 906, a support plate 903 fixedly connected with the end of the piston rod of the double-rod air cylinder 905, the piston rod being perpendicular to the fixed plate 906 (vertical downward movement), the cylinder body of two double-rod air cylinders 904 being arranged side by side and fixed on the support plate 903, the piston rod of the double-rod air cylinder 904 being perpendicular to the movement direction of the piston rod of the double-rod air cylinder 905, and the running direction being left-right movement, the end of the piston rod of the double-rod air cylinder 904 being fixedly connected with the horizontal plate 902, so that the double-rod air cylinder 904 can push the horizontal plate 902 to move left and right, and a plurality of swing angle measurement sensors 901 are linearly arranged on the horizontal plate 902, the array interval being equal to the interval of the swing shaft 131 of the swing saw head 13 installed on the to-be-tested main machine, so that each swing shaft 131 of the swing saw head 13 is coaxially connected with a swing angle measurement sensor 901 during measurement, synchronous measurement is realized, and the measurement efficiency is improved. The swing angle measurement sensor 901 is an optical encoder, the shell of which is fixed on the horizontal plate 902, the end of the rotating shaft of which is fixed with a plastic sheet with large friction, and during measurement, the end of the rotating shaft of the optical encoder is coaxially clamped on the swing shaft 131, and synchronous swing is realized, so that the swing angle range can be measured.

[0032] The working principle of the swing angle measurement is as follows: the sliding block of the sliding platform 12 is moved to the manual loading station; the to-be-tested main machine 4 is manually installed and fixed on the traveling fixture 3, and then the to-be-tested swing saw head 13 is installed in the to-be-tested main machine to realize power connection; then the to-be-tested object is transported to the lower side of the gantry frame through the sliding platform 12; then the sliding platform 7 is driven to move the swing angle measurement module 9 to the appropriate position above the to-be-tested object; then the double-rod air cylinder 905 is driven to extend downward to a reasonable position, so that the rotating shaft of the optical encoder in each swing angle measurement sensor 901 is coaxial with each swing shaft 131 of the swing saw head 13; then the double-rod air cylinder 904 is driven to first clamp the swing shaft 131, and the to-be-tested main machine is powered to rotate, so that the swing angle of each swing saw head 13 can be measured.

[0033] As Figures 1-2 and Figures 7-8As shown, the rotational speed-shaft runout-torque measuring module 8 is also fixed on the slider II 701, which is arranged side by side to the left of the swing angle measuring module 9, and is used for measuring the mechanical performance parameters such as the working rotational speed, shaft journal runout and torque of the drill tool 14 installed on the main machine 4 to be measured. The rotational speed-shaft runout-torque measuring module 8 comprises a long strip-shaped fixed plate II 801 fixedly connected to the slider II 701 by bolts, two double-rod air cylinders II 802 (the cylinder body is fixedly connected to the fixed plate II 801) installed side by side at both ends of the fixed plate II 801, a fixed plate III 803 fixedly connected to the end of the piston rod of the double-rod air cylinder II 802, and the piston rod is perpendicular to the fixed plate II 801 (moves vertically downward). A plurality of measuring modules arranged in linear array below the fixed plate III 803, each measuring module corresponds to a main machine 4 to be measured. As shown in FIG. 1, the rotational speed-shaft runout-torque measuring module 8 comprises a long strip-shaped fixed plate II 801 fixedly connected to the slider II 701 by bolts, two double-rod air cylinders II 802 (the cylinder body is fixedly connected to the fixed plate II 801) installed side by side at both ends of the fixed plate II 801, a fixed plate III 803 fixedly connected to the end of the piston rod of the double-rod air cylinder II 802, and the piston rod is perpendicular to the fixed plate II 801 (moves vertically downward). Figure 8As shown, each measuring module comprises a fixed cover 805 fixedly connected with the fixed plate III 803 (the top end of the fixed cover is bolted with the fixed plate III 803), which is internally hollow, and has a cylindrical hole at the bottom, the diameter of which is the same as that of the cylindrical surface 143 of the drill tool 14 to be measured, which plays a role of coaxial matching and guiding during measurement; a torque sensor 807 fixed at the top end of the fixed cover 805 and coaxial with the cylindrical hole at the bottom thereof, the top of the cylindrical boss of the torque sensor is provided with a one-character protruding structure, which matches with the one-character groove 141 of the drill tool 14 to be measured to transfer torque during measurement; a rotating speed measuring sensor 804 and a rotating shaft runout measuring sensor 806 are arranged on the side of the fixed cover 805 from top to bottom, the rotating speed measuring sensor 804 is an optical non-contact rotating speed measuring method, a light emitting module is arranged on one side of the fixed cover 805, and a light receiver matched therewith is arranged on the other side of the fixed cover 805, the emitted light is just directed at the one-character groove 141 feature of the end of the drill tool 14 to be measured, then the drill tool 14 to be measured will periodically block and pass through the emitted light when rotating, and the rotating speed can be calculated according to the blocking and non-blocking pulse signals obtained by the light receiver; an alternative solution is that the rotating part of the drill tool 14 to be measured is pasted with a reflective paper, and the rotating speed measuring sensor 804 is an optical rotating speed measuring sensor, which calculates the rotating speed by collecting the reflected signals of the emitted light on the reflective paper. The rotating shaft runout measuring sensor 806 is a light curtain width measuring sensor, which is composed of a light curtain emitter and a receiver, both of which are symmetrically arranged on both sides of the fixed cover 805, and are also located on both sides of the journal 142 of the drill tool 14 to be measured during work, the emitted light curtain is perpendicular to the journal 142 and slightly wider than the journal 142, and the runout of the high-speed rotating journal 142 will change the light curtain width received by the receiver, so as to calculate the runout parameters of the journal 142. An alternative solution is that the rotating shaft runout measuring sensor 806 is a contact measuring module, which is a digital display mechanical dial gauge, the mechanical dial head thereof protrudes vertically to contact the journal 142, so as to measure the distance between the journal 142 and the journal surface when the journal 142 rotates, and thus the runout value is calculated.

[0034] The working principle of the rotation speed-shaft run-out-torque measurement is as follows: after the swing angle is measured, the slider of the sliding platform 12 is moved to the artificial loading station, and the measured swing saw head 13 is manually taken off; the measured drill 14 is manually installed into the measured main machine to realize power connection; then the measured object is transported to the lower side of the 5-gantry frame through the sliding platform 12; then the sliding platform 27 is driven to move the rotation speed-shaft run-out-torque measurement module 8 to the position right above the measured object; then the double-rod cylinder 802 is driven to elongate downward to a reasonable position, so that the rotation speed measurement sensor 804 and the shaft run-out measurement sensor 806 fixed on each fixed cover 805 are respectively located at the slot 141 and the shaft journal 142 of the measured drill 14; at this time, the lower end cylindrical hole of the fixed cover 805 is coaxially slidingly matched with the cylindrical surface 143 of the measured drill 14, and the torque sensor 807 at the upper end of the fixed cover 805 is not in contact with the measured drill 14; at this time, the measured main machine 4 is started to output power to the measured drill 14, and the rotation speed and the shaft run-out parameters are synchronously measured; then the double-rod cylinder 802 is driven to elongate downward by a certain distance, and the measured drill 14 is rotated at a low speed at the same time, so that the one-slot boss of the torque sensor 807 at the upper end of the fixed cover 805 is clamped into the one-slot groove 141 of the measured drill 14, and the stall torque can be measured.

[0035] As Figures 1-2 and Figure 10As shown, the tension-gap measuring module 6 is also fixed on the slider II 701, which is arranged side by side on the left side of the rotating speed-shaft jump-torque measuring module 8, and is used for measuring the gap between the measured drill 14 and the measured host 4 under the action of the axial tension of the measured drill 14 installed on the measured host 4, for characterizing the rationality of their mechanical connection performance. The tension-gap measuring module 6 comprises a long strip-shaped fixed plate I 606 fixedly connected with the slider II 701 by bolts, four double-rod cylinders I 605 fixedly installed in linear array along the length direction of the fixed plate I 606, the cylinder body of each cylinder is fixed with the fixed plate I 606, and the piston rods are all parallel to each other and perpendicular to the fixed plate I 606; the extending end of each piston rod is fixed with an outer sleeve 604 with a cavity and an open lower end, and the top of the outer sleeve 604 is fixed with the extending end of the piston rod; a pneumatic hand grab 603 is fixed on the top of the inner cavity of the outer sleeve 604, the cylinder body of which is fixed with the outer sleeve 604, and the pneumatic fingers thereof are two block-shaped structures which can be opened and closed synchronously to realize the clamping and loosening of the object; a 602 semi-circular finger is installed on each block-shaped finger of the pneumatic hand grab 603, and when the fingers of the pneumatic hand grab 603 are closed, the two semi-circular fingers 602 form a cylindrical hole with the same diameter as the cylindrical surface 143 of the measured drill 14, so that the clamping can be realized; a gap measuring sensor 601 is installed on the outer surface of the outer sleeve 604, which is used for measuring the gap between the measured drill 14 and the measured host 4 under the action of the axial tension, and the gap measuring sensor 601 is a laser ranging sensor which vertically transmits the laser to the upper surface of the positioning mold 301 of the 3 traveling clamp, then the laser is diffusely reflected back to be received to measure the distance between the sensor and the positioning mold 301, and through the upward tension of each double-rod cylinder I 605 (the corresponding tension of the piston rod can be obtained by controlling the air supply pressure), the distance before and after the tension is measured, and their difference is the required gap size.

[0036] The working principle of the gap measurement between the measured drill 14 and the measured host 4 under the axial tension of the measured drill 14: after the rotating speed-shaft jump-torque measurement is completed, the rotating speed-shaft jump-torque measuring module 8 is lifted, at this time the sliding platform II 7 is driven to move the tension-gap measuring module 6 to the reasonable position above the measured object; then each double-rod cylinder I 605 is independently driven to make the piston rod downwardly run a reasonable distance; then each pneumatic hand grab 603 is driven to make the semi-circular fingers 602 close to clamp the cylindrical surface 143 of the measured drill 14, and the distance L1 between the laser installation position and the upper surface of the positioning mold 301 is measured by the laser ranging sensor; then a certain upward tension of each double-rod cylinder I 605 is generated by controlling the air supply pressure, and the distance L2 between the laser installation position and the upper surface of the positioning mold 301 is measured by the laser ranging sensor; the measured gap size is obtained by subtracting the two measured distances.

Claims

1. A semi-automatic measuring device for the mechanical performance parameters of an electric bone saw and drill power system, characterized by: The system comprises a machine base with a support table, a sliding platform I mounted on the support table, a travel fixture fixed on a slider of the sliding platform I, a plurality of main machines to be tested fixed on the travel fixture in an array along the movement direction of the sliding platform I, a swing saw head and a drill tool to be tested that are matched with the main machines to be tested, a gantry frame mounted on the support table and perpendicular to the movement direction of the sliding platform I, a sliding platform II fixed on the gantry frame and perpendicular to the movement direction of the sliding platform I, a tension-clearance measurement module, a speed-shaft runout-torque measurement module, and a swing angle measurement module fixed in parallel from left to right on slider II of the sliding platform II, as well as a pneumatic system, a control module, and a data acquisition and storage module. The swing angle measurement module includes a fixed plate IV fixed to a slider II, two double-rod cylinders IV with their tails fixed to both ends of the fixed plate IV and arranged vertically downward, a support plate fixed to the end faces of the piston rods of the double-rod cylinders IV, two double-rod cylinders III fixed to the support plate with their piston rods perpendicular to the movement direction of the piston rods of the double-rod cylinders IV, a translation plate fixed to the end faces of the piston rods of the double-rod cylinders III, and a plurality of swing angle measurement sensors mounted in an array on the translation plate with a spacing equal to that of the array of the host machine to be measured. The swing angle measurement sensor is a photoelectric encoder, the housing of which is fixed to the translation plate. During measurement, the end of its rotating shaft is coaxially pressed against the end face of the swing shaft of the swing saw head to be measured. The speed-shaft runout-torque measurement module includes a fixed plate II fixed on a slider II, two double-rod cylinders II fixed at the ends of the cylinder body at the two ends of the fixed plate II and arranged vertically downward in parallel, a fixed plate III fixed to the end faces of the piston rods of the double-rod cylinders II, and a plurality of measurement modules arrayed below the fixed plate III with the same number and spacing as the main machine to be measured; the measurement module includes a fixed cover fixed on the fixed plate III and having a cavity structure, a torque sensor, a speed measurement sensor and a shaft runout measurement sensor arranged from top to bottom on the side of the fixed cover; a cylindrical hole is provided at the bottom of the fixed cover, which is coaxial with the cylindrical surface of the drill tool to be measured; a straight-line protrusion is provided at the end of the torque sensor's torsion measuring cylindrical boss, the torque sensor is fixed to the top of the fixed cover, and its cylindrical boss is coaxial with the cylindrical hole of the fixed cover. When measuring torque, the straight-line protrusion matches the straight-line groove at the end of the drill tool to be measured to transmit torque; The tension-gap measurement module includes a fixed plate I fixed below the slider II, a number of double-rod cylinders I installed on the fixed plate I with the same array number, direction and spacing as the main machine to be measured, and a gap measurement component 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 downward; the gap measurement component includes an outer sleeve fixed to the end face of the piston rod of the double-rod cylinder I, which is hollow and fully open at the lower end, a pneumatic gripper with two fingers pointing vertically downward fixed to the cylinder body on the top surface of the outer sleeve, semicircular fingers respectively installed on the two fingers, and a gap measurement sensor fixed to the outer surface of the outer sleeve; when the fingers of the pneumatic gripper are closed, the two semicircular fingers coaxially clamp the cylindrical surface of the drill tool to be measured and apply vertical tension; the gap measurement sensor is a laser ranging sensor, the laser emitted is perpendicular to the upper surface of the positioning mold of the accompanying fixture and measures the distance to the surface.

2. The semi-automatic measuring device for mechanical performance parameters of an electric bone saw power system according to claim 1 is characterized by: 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 tool to be measured, and the light receiver obtains the blocked and unblocked pulse signals to calculate the speed.

3. The semi-automatic measuring device for mechanical performance parameters of an electric bone saw power system according to claim 1 is characterized by: The rotating shaft surface of the drill tool to be tested is pasted with reflective paper. The speed measuring sensor is an optical speed measuring sensor, which calculates the speed by collecting the reflection signal of the emitted light on the reflective paper.

4. The semi-automatic measuring device for mechanical performance parameters of an electric bone saw power system according to claim 1, characterized in that: The shaft runout measurement sensor is a light curtain width measurement 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, they are located on both sides of the shaft neck of the drill tool to be measured. The emitted light curtain is vertical and slightly wider than the shaft neck. The runout parameter is determined by the width of the light curtain received by the receiver when the shaft neck rotates.

5. The semi-automatic measuring device for mechanical performance parameters of an electric bone saw power system according to claim 1, characterized in that: The shaft runout measuring sensor is a mechanical dial indicator with digital display and the ability to store measured values. The extended mechanical dial indicator contacts the shaft neck vertically to measure the runout parameters.

6. The semi-automatic measuring device for mechanical performance parameters of an electric bone saw power system according to claim 1, characterized in that: The portable fixture includes a positioning mold and a locking screw; the positioning mold is provided with a host positioning circular hole that is coaxially positioned with the cylindrical feature of the host to be tested, and a positioning groove composed of two rectangular blocks for clamping the positioning planes on the left and right sides of the host to be tested; after the host to be tested is placed on the positioning mold, the locking screw is tightened from a side plate of the positioning groove.

7. The semi-automatic measuring device for mechanical performance parameters of an electric bone saw power system according to claim 1, characterized in that: The control module controls the pneumatic system to realize the movement of the tension-gap measurement module, the speed-shaft runout-torque measurement module and the swing angle measurement module, the sliding platform I and the sliding platform II, and controls the measurement implementation through the control module, and transmits the measurement data to the data acquisition and storage module.

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