CN108469326B - Micro-force spiral measuring device and system - Google Patents
Micro-force spiral measuring device and system Download PDFInfo
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- CN108469326B CN108469326B CN201810165468.4A CN201810165468A CN108469326B CN 108469326 B CN108469326 B CN 108469326B CN 201810165468 A CN201810165468 A CN 201810165468A CN 108469326 B CN108469326 B CN 108469326B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/24—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for determining value of torque or twisting moment for tightening a nut or other member which is similarly stressed
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0042—Force sensors associated with force applying means applying a torque
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Abstract
The invention discloses a micro-force spiral measuring device and a system, wherein the device comprises a handle, a strain type torque measuring sensor, a piezoelectric type force measuring sensor and a tool head, the lower end of the handle is connected with the strain type torque measuring sensor, the lower end of the strain type torque measuring sensor is connected with the upper end of the piezoelectric type force measuring sensor, and the tool head is fixed on the piezoelectric type force measuring sensor through a jackscrew. The invention can be used for measuring the micro-force spiral, and has high measurement resolution and good dynamic performance on the basis of ensuring higher strength.
Description
Technical Field
The invention relates to a spiral measurement technology for micro force in engineering. In particular to a micro-force spiral measuring device and a system.
Background
The force screw is the most general condition for simplifying any force system in space, and the force applied to a workpiece when a screwdriver screws and a drill bit drills in engineering technology is the force screw. Force spirals, also known as "couple" are a combination of a force and a torque oriented parallel to it, which requires that the force spiral measurement sensor must have the ability to accurately measure both the force and torque components of the force spiral. The spiral force measuring sensor provided in the existing literature reports selects a strain gauge sensor, wherein the force measuring sensor and the torque measuring sensor respectively select a straight beam strain gauge sensor and a circular shaft or cylinder type strain gauge torque sensor. The structure strength of the straight beam strain type force measuring sensor and the circular shaft strain type torque measuring sensor is high, but the measurement resolution of the straight beam strain type force measuring sensor and the circular shaft strain type torque measuring sensor is insufficient, and the straight beam strain type force measuring sensor and the circular shaft strain type torque measuring sensor are only suitable for measuring large-magnitude force and torque in engineering; the cylinder type strain torque measuring sensor has high measurement resolution, can be used for measuring tiny torque in engineering, but has low structural strength and weak bearing and bearing capacity, and is difficult to be matched with a force measuring sensor for realizing the measurement of force spiral.
With the continuous progress of science and technology, people need to accurately measure the tiny force spiral in engineering
Increasingly, such as dental implants in medicine and composite research in engineering. However, due to the contradiction between large strain and high structural strength, the strain type spiral force measuring sensor provided in the existing literature report cannot realize the precise measurement of the micro spiral force in engineering, and a micro spiral force measuring system is urgently needed to be developed.
At present, no literature report on the high-precision micro-force spiral measuring system is found at home and abroad. Therefore, it is desirable to provide a micro-force spiral measuring device and system.
Disclosure of Invention
The invention aims to provide a micro-force spiral measuring device which is convenient to disassemble, assemble, maintain and replace, and has high measuring resolution and high measuring precision on the basis of ensuring higher structural strength.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a micro-force spiral measuring device, includes handle, strain gauge torque sensor, piezoelectric type force cell sensor and instrument head, the lower extreme of handle with strain gauge torque sensor connects, strain gauge torque sensor lower extreme with piezoelectric type force cell sensor upper end is connected, the instrument head is fixed in piezoelectric type force cell sensor.
Preferably, the strain gauge torque sensor comprises: go up adapter plate, straining beam, foil gage, lower adapter plate and dynamic strain gauge, go up the central point of adapter plate upper surface and put and set up the screw hole, the both ends of going up the adapter plate all are equipped with the counter bore, the handle through with one end that strain formula torque sensor connects set up handle external screw thread with the last screw hole cooperation of going up the adapter plate is connected the handle with go up the adapter plate, the straining beam is located go up the lower surface of adapter plate with between the upper surface of lower adapter plate, straining beam upper end with go up the adapter plate and be connected, the foil gage paste in on the straining beam, the foil gage passes through the wire with dynamic strain gauge connects, the central point of lower adapter plate lower surface sets up down the screw hole, the both ends of lower adapter plate all are equipped with the countersunk hole, the straining beam lower extreme with lower adapter plate connects, the piezoelectric force transducer is connected with the lower adapter plate through the matching of the external thread and the lower threaded hole.
Preferably, the straining beam is a square beam structure, each straining beam is provided with two semi-cylindrical grooves, the back surface of each semi-cylindrical groove is pasted with the strain foil, the upper surface of each straining beam is provided with a strain beam upper threaded hole respectively, the lower surface of each straining beam is provided with a strain beam lower threaded hole respectively, the straining beams are connected with the upper flange through two bolts, the strain beam upper threaded holes are connected with the upper countersunk holes, the straining beams are connected with the lower flange through two bolts, the strain beam lower threaded holes are connected with the lower countersunk holes,
the two strain beams are arranged in a central symmetry mode about a connecting line of the central point of the upper connecting disc and the central point of the lower connecting disc, the two semi-cylindrical grooves are arranged on the same side of the strain beams and are respectively vertically communicated with the strain beams, and the direction of the notches of the semi-cylindrical grooves is consistent with the direction of one tangent line taking the distance between the two strain beams as a circle.
Preferably, the upper adapter plate is an aluminum element, the lower adapter plate is an aluminum element, and the two strain beams are aluminum elements.
Preferably, the piezoelectric load cell comprises: a shell, an adapter, an insulation sheet, an electrode sheet, a piezoelectric sheet, a positioning sleeve and a base,
the shell, the adapter, the insulating sheet, the electrode slice, the piezoelectric sheet, the position sleeve and the base are sequentially installed from top to bottom, the shell is provided with a shell internal thread, the upper surface of the base is provided with a base external thread, the shell internal thread is matched and connected with the base external thread, an external thread connected with the strain type force measuring sensor is positioned at the upper end of the adapter, the upper end of the adapter penetrates out of the shell and is matched and connected with the strain type force measuring sensor and the strain type force measuring torque sensor through an external thread at the upper end of the adapter and a lower threaded hole, the upper surface of the base is provided with a circular ring-shaped limit groove, the lower surface of the position sleeve is pasted on the bottom surface of the circular ring-shaped limit groove, the side surface of the position sleeve is provided with two positioning grooves and a signal line leading-out hole communicated with one positioning groove, the piezoelectric piece is located in the locating sleeve, the polarization direction of the piezoelectric piece is consistent with the axial tension and compression direction, the negative electrode of the piezoelectric piece is in contact with the bottom surface of the annular limiting groove, the positive electrode of the piezoelectric piece is in contact with the lower surface of the electrode piece, the side surface of the electrode piece is provided with a round hole which is aligned with the signal wire leading-out hole in a coaxial manner, the side surface of the insulating piece is provided with two locating bosses, the two locating bosses are located in the locating groove, the upper surface of the insulating piece is in contact connection with the lower surface of the adapter, the center of the lower surface of the lower end of the base is provided with the round hole, the center of the side surface of the lower end of the base is provided with the threaded hole, and the jackscrew is matched and.
Preferably, the shell, the adapter and the base are all aluminum elements, the locating sleeve is a hard plastic element, the electrode plate is a copper element, and the insulating sheet is a ceramic element.
Preferably, the tool head is a detachable and replaceable straight screwdriver or cross screwdriver or drill bit, and the tool head is fixed on the piezoelectric type force measuring sensor through a jackscrew.
Another object of the present invention is to provide a micro-force helical measuring system. The system has the characteristics of high measurement resolution and good dynamic performance on the basis of ensuring higher structural strength.
In order to achieve the purpose, the invention adopts the following technical scheme:
a micro-force helical measurement system, comprising: based on any one of the micro-force spiral measuring devices and the data processing unit, the micro-force spiral measuring device is used for converting a force spiral into an electric signal; and the data processing unit is used for processing the electric signal converted by the micro-force spiral measuring device to obtain force spiral data.
Preferably, the micro-force spiral measuring device comprises a handle, a strain type torque measuring sensor, a piezoelectric type force measuring sensor and a tool head, wherein the strain type torque measuring sensor comprises an upper adapter plate, a strain beam, a strain gauge, a lower adapter plate and a dynamic strain gauge, the strain type torque measuring sensor and the dynamic strain gauge form an equiarm symmetrical full-bridge circuit through the strain gauge, and the torque component in the micro-force spiral is measured by utilizing the equiarm symmetrical full-bridge circuit; the piezoelectric load cell measures a pressure component in the force helix.
Preferably, the dynamic strain gauge is configured to provide an input voltage U for the strain-gauge torque sensor, and transmit an output voltage Δ U of the strain-gauge torque sensor to the data processing unit.
The invention has the following beneficial effects:
the invention provides a measuring device and a measuring system for a micro-force spiral, which meet the requirement of accurate measurement of the micro-force spiral in engineering. The equipment is mainly formed by connecting a strain type torque measuring sensor and a piezoelectric type force measuring sensor in a matching way through an external thread and a threaded hole, and is convenient to disassemble, assemble, maintain and replace. The strain type torque measuring sensor is based on the principle of an equiarm symmetrical full-bridge circuit, the four strain gauges are reasonably distributed, the output voltage of the equiarm symmetrical full-bridge circuit can be amplified as much as possible on the basis of ensuring the higher structural strength of the structure, and therefore the measuring resolution of the sensor is improved; the piezoelectric force transducer has high structural strength, high measurement precision and resolution and convenient assembly. The equipment and the system have the characteristics of high measurement resolution and good dynamic performance on the basis of ensuring higher structural strength.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a high-precision strain piezoelectric combined micro-force spiral measurement system;
FIG. 2 is an exploded view of the piezoelectric load cell of the present invention;
FIG. 3 is a block diagram of a piezoelectric load cell of the present invention;
FIG. 4 is a cross-sectional view of a piezoelectric load cell according to the present invention;
FIG. 5 is a schematic diagram of the equi-armed symmetric full bridge circuit of the present invention.
In the figure: 1. a handle; 2. a strain-type torque sensor; 21. an upper transfer plate; 22. a strain beam; 23. a strain gauge; 24. a lower splice tray; 25. a dynamic strain gauge; 3. a piezoelectric force transducer; 31. a housing; 32. an adapter; 33. an insulating sheet; 34. an electrode sheet; 35. a piezoelectric sheet; 36. a positioning sleeve; 37. a base; 4. carrying out top thread; 5. a tool head; 6. a data processing system.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to a preferred embodiment and figures 1 to 5. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
The invention discloses a micro-force spiral measuring device which comprises a handle 1, a strain type force-measuring torque sensor 2, a piezoelectric force-measuring sensor 3 and a tool head 5, wherein the lower end of the handle 1 is provided with a handle external thread, the handle 1 and the strain type force-measuring torque sensor 2 are in matched connection with an upper threaded hole of the strain type force-measuring torque sensor 2 through the handle external thread, the strain type force-measuring torque sensor 2 and the piezoelectric force-measuring sensor 3 are in matched connection with a lower threaded hole of the strain type force-measuring torque sensor through the piezoelectric force-measuring sensor external thread, and the tool head 5 is fixed on the piezoelectric force-measuring sensor 3 through a jackscrew 4. The strain type torque measuring sensor 2 and the piezoelectric type force measuring sensor 3 are two independent sensors, are screwed and assembled through the external thread and the threaded hole, and are convenient to disassemble, assemble, maintain and replace. The handle 1 is convenient to use.
Referring to fig. 1 to 5, based on the foregoing technical solution, the micro-force spiral measuring device of the present invention may be as shown in fig. 1, where the strain-type torque sensor 2 includes an upper connection plate 21, strain beams 22, strain gauges 23, a lower connection plate 24, and a dynamic strain gauge 25, the upper threaded hole is located at a center position of an upper surface of the upper connection plate 21, both ends of the upper connection plate 21 are provided with upper countersunk holes, the handle external thread is matched with the upper threaded hole to connect the handle 1 and the upper connection plate 21, the two strain beams 22 are located between a lower surface of the upper connection plate and an upper surface of the lower connection plate, an upper end of the strain beam 22 is connected with the upper connection plate 21, the strain gauges 23 are adhered to the strain beams 22, the strain gauges 23 are connected with the dynamic strain gauge 25 through wires, the lower threaded hole is located at a center position of a lower surface of the lower connection plate 24, lower flange 24's both ends all are equipped with down the countersunk head hole, the roof beam 22 lower extreme that meets an emergency with flange 24 is connected down, piezoelectric type force cell sensor external screw thread with screw hole cooperation is connected piezoelectric type force cell sensor 3 with flange 24 down. Two in torque sensor 2 is surveyed to strain gauge two strain roof beam 22 is located go up the lower surface of adapter plate 21 with the upper surface of adapter plate 24 down, this structure can guarantee torque sensor 2 is surveyed to strain gauge have sufficient structural strength, satisfy the intensity requirement to torque sensor is surveyed to strain gauge to little power spiral measurement.
On the basis of the above technical solution, a further priority scheme is as follows: the utility model discloses a strain structure, including roof beam 22, straining roof beam 22, strain gauge 23, upper surface of roof beam 22 is equipped with two strain roof beam upper threaded holes, strain roof beam 22's lower surface is equipped with two strain roof beam lower threaded holes, strain roof beam 22 with go up adapter plate 21 and pass through two bolts go up the counter sink with strain roof beam upper threaded hole is connected. The strain beam 22 and the lower adapter plate 24 penetrate through the lower countersunk head hole through two bolts to be connected with the lower threaded hole of the strain beam. Two bolts connect the strain beam 22 with the upper adapter 21 and the lower adapter 24, and the structure improves the structural strength of the strain type torque sensor 2. The strain beam 22 is a square structure, the square beam structure is convenient for arranging semi-cylindrical grooves on the surface of the strain beam 22 and pasting two strain gauges on the back surfaces of the semi-cylindrical grooves, each strain beam is provided with two semi-cylindrical grooves, the back surface of each semi-cylindrical groove is pasted with a strain gauge 23, namely, the number of four strain gages 23 stuck on two strain beams 22 is 4, wherein the two strain beams (22) are arranged in a central symmetry mode about a connecting line between the central point of the upper connecting disc (21) and the central point of the lower connecting disc (24) (namely the connecting line is used as an axis and can be completely coincided when rotating for 180 degrees), the two semi-cylindrical grooves are arranged on the same side of the strain beams and are respectively vertically communicated with the strain beams, the direction of the notch of the semi-cylindrical groove is consistent with the direction of one tangent line taking the distance between the two strain beams as a circle. When the strain type torque sensor 2 bears the dynamic torque effect, the two strain beams 22 are both subjected to bending deformation, and due to the arc effect, each strain beam can generate a positive strain concentration area and a negative strain concentration area at the positions corresponding to the semi-cylindrical grooves (namely the sticking positions of the strain gauges 23 in fig. 1), so that two of the four strain gauges 23 are positioned in the positive strain concentration areas, and two of the four strain gauges are positioned in the negative strain concentration areas; two positive strains and two negative strains can just form an equi-armed symmetrical full-bridge circuit, as shown in fig. 5, four strain gages 23 can be reasonably arranged according to the principle of the equi-armed symmetrical full-bridge circuit, and amplification of voltage signals is achieved. Therefore, the measurement component ratio of the strain type torque measuring sensor is improved. The strain gauge 23 must be firmly adhered to the strain beam 22; the measuring system needs to be assembled through bolts or threads, and the measuring system needs to be screwed as tightly as possible within the allowable strength range so as to improve the rigidity of the measuring system and ensure the measuring accuracy of the measuring system. On the basis of the above technical solution, a further priority scheme is as follows: the upper adapter 21 is an aluminum element, the lower adapter 24 is an aluminum element, and the two strain beams 22 are aluminum elements. The aluminum is used for the elements, so that the aluminum product has light weight and good conductivity.
Referring to the figures related to fig. 1 to 5, the micro-force spiral measuring device of the present invention can also be shown in fig. 2 based on the foregoing technical solution, wherein a piezoelectric force transducer 3 includes a housing 31, an adapter 32, an insulating sheet 33, an electrode sheet 34, a piezoelectric sheet 35, a positioning sleeve 36 and a base 37, the housing 31, the adapter 32, the insulating sheet 33, the electrode sheet 34, the piezoelectric sheet 35, the positioning sleeve 36 and the base 37 are sequentially installed from top to bottom, a housing external thread is provided inside the housing 31, a base internal thread is provided on an upper surface of the base 37, the housing external thread is matched with the base internal thread to connect the housing 31 and the base 37, the piezoelectric force transducer external thread is located at an upper end of the adapter 32, the adapter 32 and the lower adapter 24 are connected by matching the piezoelectric force transducer external thread with the lower threaded hole, the central position of the upper surface of the base 37 is provided with a circular limiting groove, the lower surface of the positioning sleeve 36 is adhered to the bottom surface of the circular limiting groove, the side surface of the positioning sleeve 36 is provided with two positioning grooves and a signal wire leading-out hole, one positioning groove and the signal wire leading-out hole can be structurally designed to be communicated for convenient installation, the piezoelectric sheet 35 is positioned in the positioning sleeve, the polarization direction of the piezoelectric sheet 35 is designed to be consistent with the axial tension and compression direction, the cathode of the piezoelectric sheet 35 is contacted with the bottom surface of the circular limiting groove, the anode of the piezoelectric sheet is contacted with the lower surface of the electrode sheet 34, the side surface of the insulating sheet 33 is provided with two positioning bosses which are positioned in the positioning grooves, the upper surface of the insulating sheet 33 is contacted and connected with the lower surface of the adapter 32, and the center of the lower surface of the lower end of the base 37, a threaded hole is formed in the center of the side surface of the lower end of the base 37, and the jackscrew 4 is matched with the threaded hole in the center of the side surface of the lower end of the base 37 to fix the tool head 5 in the round hole in the lower surface of the lower end of the base 37.
The piezoelectric force transducer 3 consists of seven parts including a shell 31, an adapter 32, an insulating sheet 33, an electrode sheet 34, a piezoelectric sheet 35, a positioning sleeve 36 and a base 37; arranging the base 37, the positioning sleeve 36, the piezoelectric plate 35, the electrode plate 34, the insulating plate 33, the adapter 32 and the shell 31 in sequence from bottom to top, and screwing and assembling the external thread of the base 37 and the internal thread of the shell 31, so that the piezoelectric force transducer 3 can be assembled and the piezoelectric plate 35 can be pre-pressed; the piezoelectric force cell 3 has high structural strength, high measurement precision and resolution and convenient assembly.
On the basis of the above technical solution, a further priority scheme is as follows: the shell 31, the adapter 32 and the base 37 are all aluminum elements, the positioning sleeve 36 is a hard plastic element, the electrode plate 34 is a copper element, and the insulating sheet 33 is a ceramic element. The adapter 32 and the base 37 are made of aluminum elements, and are made of aluminum light and conductive elements, the positioning sleeve 36 plays a role in supporting and positioning the piezoelectric plate 35 and the insulating plate 33 in the piezoelectric force transducer 3, so that a hard plastic material with light weight and enough hardness is adopted, the insulating plate 33 plays an insulating role in the piezoelectric force transducer 3, so that an insulating ceramic material is adopted for preparation, the electrode plate 34 plays a conductive role in the piezoelectric force transducer 3, and a copper material with good conductive performance is adopted for preparation.
On the basis of the above technical solution, a further priority scheme is as follows: the tool head 5 is designed to be detachable, and the selection range comprises a straight screwdriver, a cross screwdriver, a drill bit and the like. The particular choice of tool head may be adjusted according to the operating requirements. The tool head has a plurality of options, so that the application range of the invention is expanded.
Based on the measuring device, the invention provides a micro-force spiral measuring system, which comprises: the micro-force spiral measuring device comprises a handle 1, a strain type torque measuring sensor 2, a piezoelectric force measuring sensor 3 and a tool head 5 and is used for measuring force spiral data, wherein a dynamic strain gauge 25 of the strain type torque measuring sensor is used for providing input voltage U for the strain type torque measuring sensor 2 and transmitting output voltage delta U of the strain type torque measuring sensor 2 to the data processing unit 6; the data processing unit 6 is used for processing the data collected by the micro-force spiral measuring device.
When the tool head 5 bears the micro-force spiral effect, the piezoelectric force measuring sensor 2 and the strain type torque measuring sensor 3 can respectively measure the force component and the torque component in the micro-force spiral on the tool head 5, the dynamic strain gauge 25 collects data of the torque measuring sensor 2 during strain and transmits the data to the data processing unit 6, corresponding dynamic torque can be obtained after processing, and the data measured by the piezoelectric force measuring sensor 3 is transmitted to the data processing unit 6 through a data line, so that corresponding dynamic force can be obtained after processing. In the spiral force measuring system, the strain type torque measuring sensor 2 has the characteristics of high structural strength and high measuring resolution; the piezoelectric force transducer 3 also has the characteristics of high structural strength, high measurement precision and high resolution, so that the whole measurement system has the characteristics of high structural strength, high measurement precision and high resolution, and the measurement resolutions of the force component and the torque component in the force spiral can reach 10 respectively-3N and 10-3N m, which solves the problem that the micro-force spiral measurement in the prior art can not simultaneously have high structural strength and high resolution. When the strain type torque measuring sensor 2 bears the action of dynamic torque, the two strain beams 22 are both subjected to bending deformation, and due to the arc effect, each strain beam 22 generates a positive strain concentration area and a negative strain concentration area at the positions corresponding to the semi-cylindrical grooves (namely the sticking positions of the strain gauges 23 in fig. 1), so that two of the four strain gauges 23 are positioned in the positive strain concentration areas, and two strain concentration areas are positioned in the negative strain concentration areas; two positive strains and two negative strains just can constitute an equi-armed symmetrical full-bridge circuit, and four strain gages 23 can be reasonably arranged according to the principle of the equi-armed symmetrical full-bridge circuit, so that the amplification of voltage signals is realized. Fig. 5 is a schematic diagram of an equi-arm symmetric full-bridge circuit, where the resistances of four strain gauges 23 connected to the circuit are all R, the input voltage connected to the circuit is U, and the output voltage of the circuit is Δ U; where U is provided by the dynamic strain gauge 25 and Δ U is due to deformation of the strain gage 23 and is coupled into the dynamic strain gauge 25; the dynamic strain gauge 25 collects the Δ U and transmits the Δ U to the data processing unit 6 through a signal line, and at this time, a corresponding dynamic torque can be obtained through processing. When the piezoelectric force sensor 3 bears the dynamic tension and pressure, the adapter32 has a degree of freedom in the polarization direction of the piezoelectric sheet 35 with respect to the housing 31 and the base 37, so as to convert an external force applied thereto into strain of the piezoelectric sheet 35; according to the piezoelectric effect, the piezoelectric force transducer 3 will generate a dynamic voltage signal, and the signal is transmitted to the data processing unit 6 through a signal line, so that a corresponding dynamic force can be obtained after processing.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (7)
1. A micro-force spiral measuring device is characterized by comprising a handle (1), a strain type torque measuring sensor (2), a piezoelectric type force measuring sensor (3) and a tool head (5),
the lower end of the handle (1) is connected with the strain type force-measuring torque sensor (2), the lower end of the strain type force-measuring torque sensor (2) is connected with the upper end of the piezoelectric force-measuring sensor (3), and the tool head (5) is fixed on the piezoelectric force-measuring sensor (3) through a jackscrew (4);
the strain gauge torque sensor (2) comprises: an upper adapter plate (21), a strain beam (22), a strain gauge (23), a lower adapter plate (24) and a dynamic strain gauge (25),
go up the central point of adapter plate (21) upper surface and put and set up screw hole, the both ends of going up adapter plate (21) all are equipped with the counter sink, handle (1) through with one end that strain gauge survey torque sensor (2) are connected set up handle external screw thread with the last screw hole cooperation of going up adapter plate (21) is connected handle (1) with go up adapter plate (21), straining roof beam (22) are located go up the lower surface of adapter plate (21) and between the upper surface of lower adapter plate (24), straining roof beam (22) upper end with go up adapter plate (21) and be connected, foil gage (23) paste in on straining roof beam (22), foil gage (23) pass through the wire with dynamic strain gauge (25) are connected, the central point of lower adapter plate (24) lower surface puts and sets up down the screw hole, the both ends of lower adapter plate (24) all are equipped with the counter sink hole, the lower end of the strain beam (22) is connected with the lower adapter plate (24), and the piezoelectric force transducer (3) is matched with the lower threaded hole through an external thread to connect the piezoelectric force transducer (3) and the lower adapter plate (24);
the piezoelectric force transducer (3) comprises: a shell (31), a switching head (32), an insulating sheet (33), an electrode sheet (34), a piezoelectric sheet (35), a positioning sleeve (36) and a base (37),
the shell (31), the adapter (32), the insulating sheet (33), the electrode slice (34), the piezoelectric sheet (35), the position sleeve (36) and the base (37) are installed by the sequence from top to bottom, the shell (31) is provided with an inner shell thread, the upper surface of the base (37) is provided with an outer base thread, the inner shell thread is matched and connected with the outer base thread, the shell (31) is matched and connected with the base (37), the outer thread connected with the strain type torque measuring sensor is positioned at the upper end of the adapter (32), the upper end of the adapter (32) penetrates out of the shell (31) and is matched and connected with the lower threaded hole through the outer thread at the upper end of the adapter (32), the piezoelectric type force measuring sensor (3) and the strain type torque measuring sensor (2), the upper surface of the base (37) is provided with a circular ring-shaped limiting groove, the lower surface of the locating sleeve (36) is adhered to the bottom surface of the circular ring-shaped limiting groove, the side surface of the locating sleeve (36) is provided with two locating grooves and a signal wire leading-out hole communicated with one locating groove, the piezoelectric sheet (35) is positioned in the locating sleeve, the polarization direction of the piezoelectric sheet (35) is consistent with the axial tension and compression direction, the negative electrode of the piezoelectric sheet (35) is contacted with the bottom surface of the circular ring-shaped limiting groove, the positive electrode of the piezoelectric sheet (35) is contacted with the lower surface of the electrode sheet (34), the side surface of the electrode sheet (34) is provided with a round hole which is aligned with the signal wire leading-out hole in a coaxial line, the side surface of the insulating sheet (33) is provided with two locating bosses which are positioned in the locating grooves, and the upper surface of the insulating sheet (33), a round hole is formed in the center of the lower surface of the lower end of the base (37), a threaded hole is formed in the center of the side surface of the lower end of the base (37), and the jackscrew (4) and the threaded hole in the center of the side surface of the lower end of the base (37) are matched with each other to fix the tool head (5) in the round hole in the lower surface of the lower end of the base (37);
the shell (31) adapter (32) with base (37) are aluminium system component, position sleeve (36) are the hard plastic component, electrode slice (34) are the copper component, insulating piece (33) are ceramic element.
2. The micro-force spiral measuring device according to claim 1, wherein the strain beams (22) are of a square beam structure, each strain beam (22) is provided with two semi-cylindrical grooves, the strain gauge (23) is adhered to the back surface of each semi-cylindrical groove, the upper surfaces of the two strain beams (22) are respectively provided with strain beam upper threaded holes, the lower surfaces of the two strain beams (22) are respectively provided with strain beam lower threaded holes, the two strain beams (22) and the upper adapter plate (21) are connected with the strain beam upper threaded holes and the upper countersunk holes through two bolts, the two strain beams (22) and the lower adapter plate (24) are connected with the strain beam lower threaded holes and the countersunk holes through two bolts,
the two strain beams (22) are arranged in a central symmetry mode about a connecting line of a central point of the upper connecting disc (21) and a central point of the lower connecting disc (24), the two semi-cylindrical grooves in each strain beam (22) are arranged on the same side of the strain beam and are respectively vertically communicated with the strain beams, and the direction of the notches of the semi-cylindrical grooves is consistent with the direction of one tangent line taking the distance between the two strain beams as a circle.
3. Micro-force screw measuring device according to any one of claims 1-2, characterized in that the upper adapter plate (21) is an aluminium element, the lower adapter plate (24) is an aluminium element and the two strain beams (22) are aluminium elements.
4. A micro-force screw measuring device according to claim 1, wherein the tool head (5) is a detachable screwdriver in line or a phillips screwdriver or a drill.
5. A micro-force helical measurement system, comprising: micro-force spiral measuring device and data processing unit (6) according to any of claims 1 to 4,
the micro-force spiral measuring device is used for converting the micro-force spiral into an electric signal;
and the data processing unit (6) is used for processing the electric signal converted by the micro-force spiral measuring device to obtain micro-force spiral data.
6. Micro-force spiral measurement system according to claim 5, characterized in that the micro-force spiral measurement device comprises a handle (1), a strain-type torque sensor (2), a piezoelectric load cell (3) and a tool head (5),
the strain type torque measuring sensor (2) comprises an upper adapter plate (21), a strain beam (22), a strain gauge (23), a lower adapter plate (24) and a dynamic strain gauge (25), the strain type torque measuring sensor (2) and the dynamic strain gauge (25) form an equiarm symmetrical full-bridge circuit through the strain gauge (23) arranged, and the equiarm symmetrical full-bridge circuit is used for measuring a torque component in a micro-force spiral;
the piezoelectric force transducer (3) measures a pressure component in the micro-force helix.
7. Micro-force screw measuring system according to claim 6, wherein the dynamic strain gauge (25) is adapted to provide an input voltage Uto the strain gauge torque sensor (2) and to transmit an output voltage Δ Uto the strain gauge torque sensor (2) to the data processing unit (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN110057481B (en) * | 2019-05-28 | 2020-09-29 | 武汉理工大学 | Torque transmission measuring device between two shafts based on fiber bragg grating and strain gauge technology |
| CN110578512B (en) * | 2019-08-29 | 2023-08-18 | 长江大学 | Transmission line sensor and array type water holdup detecting instrument |
| CN112014008A (en) * | 2020-07-28 | 2020-12-01 | 北京电子工程总体研究所 | Three-dimensional force sensor and force measurement system |
| CN113188783B (en) * | 2021-04-28 | 2022-12-16 | 上海理工大学 | Torque performance testing device for real-time visualization of torque of surgical instrument |
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| CN2093392U (en) * | 1991-05-20 | 1992-01-15 | 华东工学院 | High-frequency response piezo-electric film type pressure transducer |
| GB2272524B (en) * | 1992-11-10 | 1994-11-09 | Christopher Philip Sperring | Joints |
| US6442812B1 (en) * | 2000-03-02 | 2002-09-03 | Eaton Corporation | Method of manufacturing a piezoelectric torque sensor |
| CN1139792C (en) * | 2001-08-10 | 2004-02-25 | 大连理工大学 | Torque measuring method and sensor |
| CN101144764B (en) * | 2007-09-11 | 2010-08-11 | 中北大学 | Dynamic and static mechanics integrated test platform |
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| CN103471751B (en) * | 2013-09-26 | 2015-05-27 | 北京空间飞行器总体设计部 | High-precision strain type torque sensor |
| CN104634494B (en) * | 2015-02-02 | 2017-02-22 | 哈尔滨工程大学 | Thrust/torque measuring device for pod test |
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