CN110186796B - Tooth orthodontic correction arch wire bracket friction and wear experimental device and method - Google Patents
Tooth orthodontic correction arch wire bracket friction and wear experimental device and method Download PDFInfo
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- CN110186796B CN110186796B CN201910464254.1A CN201910464254A CN110186796B CN 110186796 B CN110186796 B CN 110186796B CN 201910464254 A CN201910464254 A CN 201910464254A CN 110186796 B CN110186796 B CN 110186796B
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- 238000012937 correction Methods 0.000 title claims abstract description 9
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- 238000012360 testing method Methods 0.000 claims abstract description 50
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- 238000002474 experimental method Methods 0.000 claims abstract description 19
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- 238000003825 pressing Methods 0.000 claims description 10
- 230000008859 change Effects 0.000 abstract description 6
- 238000011160 research Methods 0.000 abstract description 4
- 238000004088 simulation Methods 0.000 abstract description 3
- 238000005299 abrasion Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 8
- 239000003292 glue Substances 0.000 description 4
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
Abstract
The invention discloses a friction and abrasion test device and a test method for a tooth orthodontic archwire bracket, wherein the device comprises an archwire for tooth orthodontic correction, an experiment table top, an archwire fixing and pre-tightening mechanism which is fixedly connected to the experiment table top and is used for fixing and pre-tightening the archwire, a pre-tightening force test mechanism which is used for simultaneously measuring the pre-tightening force of the archwire, a friction test mechanism which is provided with a cantilever beam and is used for applying load to the archwire through the cantilever beam, and a data acquisition system which is used for feeding back the stress of the cantilever beam and is used for measuring data; the friction testing mechanism drives the cantilever beam to reciprocate to rub the arch wire along the length direction of the arch wire; according to the invention, the influence of the pretightening force of the arch wire on the experimental result can be quantified through the digital display tension meter, the experimental variable is accurately controlled, the experimental result is more reliable and effective, the influence of the pretightening force change on the friction and wear performance of the arch wire bracket is greatly assisted in deep research, and a more reliable and effective simulation experimental method is provided for the friction and wear performance research of the arch wire bracket.
Description
Technical Field
The invention relates to the field of orthodontic study equipment, in particular to a tooth orthodontic correction archwire bracket friction and wear experimental device and a tooth orthodontic correction archwire bracket friction and wear experimental method.
Background
The misjaw deformity is used as a clinical common symptom, not only can cause abnormal oral functions and easily cause diseases, but also seriously affects the beauty, so that the correction of the misjaw deformity is more and more popular in modern society with high development of civilization.
In orthodontic treatment, one of the most important treatment means is to use an orthodontic appliance composed of an archwire and a bracket, and the frictional wear property of the archwire bracket has become one of the important points of research in orthodontic science. By selecting the appropriate archwire bracket materials, specifications, surface finish methods, securing means, load sizes to minimize friction between the archwire brackets, therapeutic efficiency can be greatly improved, and teeth Zhou Sunhai reduced. Therefore, the relative sliding condition of the arch wire bracket in the actual working state is simulated, the friction force between the arch wire brackets is accurately measured, and a powerful basis can be provided for the design and manufacture of the arch wire bracket and the research on orthodontic treatment and orthodontic related study of an stomatologist.
The current equipment generally adopts the mutual contact of the archwire and the bracket to carry out reciprocating motion, and the archwire can change parameters such as pretightening force and the like in the load application and motion process, so that the experimental result is influenced, and the experimental requirements of high-precision test and accuracy data can not be met.
Accordingly, the prior art is still in need of improvement and development.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a friction and wear experimental device and a testing method for a orthodontic archwire bracket, and aims to solve the problems that parameters such as pre-tightening amount and the like are changed due to compression and movement of an archwire in the existing experimental equipment, the experimental result is influenced, and high-precision test cannot be achieved and accuracy data can not be obtained.
The technical scheme of the invention is as follows:
The friction and wear experimental device for the orthodontic archwire bracket comprises an archwire for orthodontic correction, an experimental table top, an archwire fixing and pre-tightening mechanism fixedly connected to the experimental table top and used for fixing and pre-tightening the archwire, a pre-tightening force testing mechanism fixedly installed on the experimental table top and used for clamping and straightening the archwire in a matched manner and simultaneously measuring the pre-tightening force of the archwire, and a friction testing mechanism fixedly installed on the experimental table top and provided with a cantilever beam and used for applying load to the archwire through the cantilever beam, and a data acquisition system connected with the cantilever beam and used for measuring data after stress feedback of the cantilever beam; the friction testing mechanism drives the cantilever beam to reciprocate along the length direction of the arch wire to rub the arch wire.
Further, the fixed pretension mechanism of arch wire is including being located the same side of cantilever beam and the base of fixed mounting on experimental table surface, along the guide rail of length direction fixed connection on the base of arch wire, the cover is established on the guide rail and along the pretension slider that the guide rail slided, fix the dead screw on the base to the pretension slider through the kidney-shaped hole of seting up on the pretension slider, screw connection is in the pretension slider side and screw up the back terminal set screw that supports the guide rail, fixed connection is at the pretension piece on the guide rail surface, connect on the pretension piece and terminal support the pretension screw of pretension slider through the screw hole, and fixed connection is on the pretension slider and compress tightly the terminal briquetting of arch wire.
Further, the pretightening force testing mechanism comprises a horizontal testing machine frame fixedly connected to the experimental table top, a tension meter fixing plate fixedly connected to the horizontal testing machine frame, a digital display tension meter fixedly connected to the tension meter fixing plate, a connecting rod connected to the digital display tension meter, and a clamping head fixedly connected to the tail end of the connecting rod, wherein the clamping head and the arch wire fixing pretightening mechanism are respectively fixedly connected with two ends of an arch wire and tighten the arch wire.
Further, the friction testing mechanism comprises a triaxial displacement table fixed on the experiment table, a cantilever beam fixedly connected to the triaxial displacement table and driven by the triaxial displacement table to move along the X axis, the Y axis and the Z axis, a placing table fixedly connected to the tail end of the cantilever beam and in a concave shape, a bracket fixing block fixedly connected to the inside of a groove of the placing table, and a bracket positioned inside the groove of the placing table and fixedly connected to the bracket fixing block;
the bracket surface is in contact with the archwire and rubs reciprocally along the length of the archwire.
Further, the triaxial displacement platform comprises a triaxial translation assembly, a motor which is connected with the triaxial translation assembly and provides power for moving the shaft along the length direction of the arch wire, and a motor controller which is electrically connected with the motor and controls the motor.
Further, the data acquisition system comprises a plurality of force sensors fixedly arranged on the cantilever beam, a bridge box electrically connected with the force sensors, a strain amplifier electrically connected with the bridge box, a data acquisition device electrically connected with the strain amplifier and a computer electrically connected with the data acquisition device.
Further, the force sensors are distributed on the upper surface, the lower surface and two side surfaces of the cantilever beam.
Further, the computer controls the motor controller.
Further, the arch wire is parallel to the experiment table surface, and the length direction of the arch wire is perpendicular to the cantilever beam.
The test method of the friction and wear experimental device for the archwire bracket comprises the following steps:
Clamping and fixing the bracket;
clamping and fixing the arch wire, and applying a pretightening force through the arch wire fixing pretightening mechanism;
carrying out position adjustment and load application on the bracket;
Starting a friction testing mechanism;
The data acquisition system acquires load information and friction force information and obtains a friction coefficient through software calculation.
Compared with the prior art, the invention can measure the pretightening force of the arch wire in friction in real time through the digital display tension meter, quantizes the influence of the pretightening force of the arch wire on experimental results, controls the bracket to move the friction arch wire, can accurately control experimental variables, ensures that the experimental results are more reliable and effective, greatly helps to deeply study the influence of the pretightening force change on the friction and wear performance of the arch wire bracket, and provides a more reliable and effective simulation experimental method for the friction and wear performance study of the arch wire bracket.
Drawings
Fig. 1 is a schematic structural view of a friction and wear experimental device for orthodontic archwire brackets according to an embodiment of the invention.
Fig. 2 is a schematic structural view of a friction and wear experimental device for orthodontic archwire brackets according to an embodiment of the invention.
FIG. 3 is a partial schematic view of the friction testing mechanism and archwire retention and pre-tightening mechanism in accordance with an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a friction testing mechanism according to an embodiment of the present invention.
Fig. 5 is a flowchart of a test method based on the archwire bracket frictional wear test device of the present embodiment.
In the figure: 2. an archwire; 3. an arch wire fixing and pre-tightening mechanism; 4. a pretightening force testing mechanism; 5. a friction testing mechanism; 6. a data acquisition system; 31. a base; 32. a guide rail; 33. pre-tightening the sliding block; 34. waist-shaped holes; 35. pre-tightening a screw; 36. briquetting; 37. a fixing screw; 38. a pre-tightening block; 39. a set screw; 41. a horizontal test rack; 42. a tension meter fixing plate; 43. a digital display tension meter; 44. a connecting rod; 45. a chuck; 51. a triaxial displacement table; 511. a triaxial translation assembly; 512. a motor; 513. a motor controller; 52. a cantilever beam; 53. a placement table; 54. a pin; 55. a bracket fixing block; 56. a bracket; 61. a force sensor; 62. a bridge box; 63. a strain amplifier; 64. a data collector; 65. and a computer.
Detailed Description
The invention provides a tooth orthodontic archwire bracket friction and wear experimental device and a test method, and in order to make the purposes, technical schemes and effects of the invention clearer and more definite, the invention is further described in detail below by referring to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1 and 2, the invention provides a friction and wear experimental device for a dental orthodontic archwire bracket, which comprises an archwire 2 for dental orthodontic correction, a horizontally placed experimental table (not shown in the drawing), an archwire fixing and pre-tightening mechanism 3 fixedly connected to the experimental table and used for fixing and pre-tightening the archwire 2, a pre-tightening force testing mechanism 4 used for measuring the pre-tightening force of the archwire, a friction testing mechanism 5 provided with a cantilever beam 52 and used for applying a load to the archwire 2 through the cantilever beam 52, and a data acquisition system 6 used for measuring data through stress feedback of the cantilever beam 52. The arch wire 2 is horizontally straightened through the arch wire fixing pre-tightening mechanism 3 and the pre-tightening force testing mechanism 4, the pre-tightening force of the arch wire is measured through the pre-tightening force testing mechanism 4, the arch wire 2 is repeatedly rubbed through the friction testing mechanism 5 with the cantilever beam 52, the cantilever beam 52 is stressed to deform, and the stress feedback of the cantilever beam 52 is detected through the data acquisition system 6, so that friction and wear data of the arch wire 2 are obtained through analysis.
As shown in fig. 1 and 3, the arch wire fixing and pre-tightening mechanism 3 is fixedly arranged on an experiment table surface through screws, the arch wire fixing and pre-tightening mechanism 3 comprises a base 31 which is positioned on the same side of a cantilever beam 52 and is fixedly arranged on the experiment table surface, a guide rail 32 is fixedly connected to the base 31 through screws, the guide rail 32 is paved along the length direction of the arch wire 2, a pre-tightening sliding block 33 is sleeved on the guide rail 32, the pre-tightening sliding block 33 can slide along the guide rail 32, a waist-shaped hole 34 is formed in the pre-tightening sliding block 33, a fixing screw 37 penetrates through the waist-shaped hole 34 and is spirally connected to the base 31, when the pre-tightening sliding block 33 moves to a specific position, the pre-tightening sliding block 33 is fixed on the base 31 through the fixing screw 37, a positioning screw 39 is connected to the side surface of the pre-tightening sliding block 33 through a threaded hole, and the tail end of the pre-tightening sliding block 39 is abutted against the side surface of the guide rail 32, so that the pre-tightening sliding block 33 is fixed with the guide rail 32 in position; the surface of the guide rail 32 is fixedly connected with a pre-tightening block 38 through a screw, two sides of the pre-tightening block 38 are connected with pre-tightening screws 35 through threaded holes, the pre-tightening screws 35 are horizontally arranged, the tail ends of the pre-tightening screws 35 are propped against the pre-tightening sliding blocks 33, the pre-tightening sliding blocks 33 can be pushed through rotation of the pre-tightening screws 35, the pre-tightening sliding blocks 33 are fixedly connected with pressing blocks 36 through screws, the pressing blocks 36 are used for pressing the tail ends of the archwires 2, positioning grooves (not marked in the drawing) are formed in the upper surface of the pre-tightening sliding blocks 33 below the pressing blocks 36, and the tail ends of the archwires 2 are placed in the positioning grooves during fixing.
As shown in fig. 1 and 2, the pretightening force testing mechanism 4 is fixedly installed on an experiment table surface through screws, and comprises a horizontal testing machine frame 41 fixedly connected on the experiment table surface, a tensiometer fixing plate 42 is connected on the horizontal testing machine frame 41 through screws, a digital display tensiometer 43 is fixedly connected on the tensiometer fixing plate 42 through screws, a connecting rod 44 is fixedly connected with the active end of the digital display tensiometer 43, a clamping head 45 is fixedly connected with the tail end of the connecting rod 44 through threads, the clamping head 45 clamps the other end of the arch wire 2, and a pressing block 36 on the arch wire fixing pretightening mechanism 3 is respectively and fixedly connected with the two ends of the arch wire 2 and tightens the arch wire 2, so that the arch wire 2 is parallel to the experiment table surface, the indexing value of the digital display tensiometer 43 is 50N, the indexing value is 0.01N, the precision reaches +/-0.5%, the pretightening degree of the arch wire 2 can be precisely controlled, and the elastic deformation of the arch wire 2 itself is prevented from interfering an experiment result.
One end of the arch wire 2 is placed in a positioning groove on the upper surface of the pre-tightening sliding block 33 and is fixed by a pressing block 36, and then the other end of the arch wire 2 is clamped by a clamping head 45 to finish the fixation of the arch wire 2; then, a switch of the digital display tension meter 43 is opened, the pre-tightening screw 35 is screwed, the pre-tightening screw is extruded and pushed to push the pre-tightening block 38 to slide along the guide rail 32, the arch wire 2 is further subjected to stretching pre-tightening, meanwhile, the indication number of the digital display tension meter 43 is observed, when the pre-tightening force reaches a specified value, the screwing of the pre-tightening screw 35 is stopped, the pre-tightening block 33 is fixed on the base 31 through the fixing screw 37, and the positioning screw 39 is screwed to fix the pre-tightening block 33 and the guide rail 32, so that the pre-tightening state of the arch wire 2 is maintained; finally, the pre-tightening screw 35 is loosened to avoid mechanical damage to the pre-tightening screw 35 and the pre-tightening block 38, thereby completing pre-tightening of the archwire 2.
As shown in fig. 1, fig. 2 and fig. 4, the friction testing mechanism 5 includes a triaxial displacement platform 51 fixed on the experimental table surface by a screw, a cantilever beam 52 is fixedly connected to the movement output end of the triaxial displacement platform 51 by a screw, the triaxial displacement platform 51 includes a triaxial translation assembly 511, the triaxial translation assembly 511 is manually rotated by a division card in three directions of an X axis, a Y axis and a Z axis, the triaxial translation assembly 511 is a conventional technology in the art, a specific structure is not described, the triaxial translation assembly 511 can be manually controlled to enable the cantilever beam 52 connected to the triaxial translation assembly 511 to move up and down, left and right and back, the triaxial displacement platform 51 in the embodiment further includes a motor 512, an output shaft of the motor 512 is fixedly connected with a shaft of the triaxial translation assembly 511 moving along the length direction of an arch wire 2 by a coupling, the motor controller 513 is electrically connected to the motor 512, the motor 512 adopts a three-phase stepping motor, accurate control of the speed of the motor 512 can be achieved by the three-phase stepping motor controller 513, and the automatic control of the speed of the motor 512 can be achieved, the three-phase stepping motor controller is further connected to enable the cantilever beam 52 to be automatically controlled along the length direction of the cantilever beam 511, and the accurate control of the arch wire 2 can be achieved.
One end of the cantilever beam 52 is fixedly connected to the triaxial displacement table 51, the other end of the cantilever beam is protruded out of the triaxial displacement table 51, the tail end of the cantilever beam 52 is fixedly connected with a placement table 53 through a screw, a groove is formed in the middle of the placement table 53, the outer contour of the cantilever beam 52 is concave, a bracket fixing block 55 is fixedly connected in the groove of the placement table 53 through a pin 54, the pin 54 penetrates through two side walls of the groove and the bracket fixing block 55, the bracket fixing block 55 is clamped and embedded in the groove of the placement table 53, a bracket 56 is adhered to the bracket fixing block 55, the bracket 56 is positioned below an arch wire 2 and is in contact with the arch wire 2, and the length direction of the arch wire 2 is perpendicular to the cantilever beam 52; in the actual orthodontic procedure, the bracket 56 is bonded to the face of the tooth and the bracket 56 is tightened by the archwire 2 to straighten the tooth.
When the triaxial displacement table 51 starts to work, the cantilever beam 52 is driven to reciprocate along the length direction of the archwire 2, and then the bracket 56 is driven to rub the archwire 2, so that a friction environment is simulated; the existing friction experiment device for the archwire 2 and the bracket 56 mostly takes the archwire 2 as a driving piece, because the fixing and pre-tightening process of the archwire 2 is an important link of experiment preparation work, the design of the archwire fixing pre-tightening mechanism 3 is complex when accurate data is obtained in the prior art, and the bracket 56 is taken as the driving piece in the embodiment, so that the design of the archwire fixing pre-tightening mechanism 3 is simple and practical, and the experiment requirement is more met.
The bracket 56 is secured by: the bracket 56 is placed on the bracket fixing block 55, then the triaxial displacement table is adjusted to enable the archwire 2 to be in correct contact with the bracket 56, at the moment, the bracket 56 is clamped by forceps, the triaxial displacement table 51 is adjusted to enable the bracket fixing block 55 to descend to be at a certain distance from the bottom of the bracket 56, after 1-2 drops of glue are dropped on the bracket fixing block 55, the triaxial displacement table 51 is adjusted to enable the bracket fixing block 55 to be in contact with the bottom of the bracket 56 again, the correct contact between the archwire 2 and the bracket 56 is kept, and the bracket 56 is fixed after the glue is solidified.
As shown in fig. 1 and 2, the data acquisition system 6 includes a plurality of force sensors 61 fixedly attached to the cantilever beam 52, in this embodiment, 4 force sensors 61 are disposed on the upper and lower surfaces and two sides of the cantilever beam 52, the force sensors 61 are electrically connected with bridge boxes 62, the bridge boxes 62 are mainly used for measuring the change of the dc resistance value of the force sensors 61, the bridge boxes 62 are electrically connected with strain amplifiers 63, the strain amplifiers 63 are used for performing undistorted amplification on the amplitude modulation voltage sent by the bridge boxes 62, the data collectors 64 are electrically connected with the strain amplifiers 63, the data collectors 64 are used for converting analog signals into digital signals, and the data collectors 64 are electrically connected with a computer 65, and the computer 65 processes and analyzes the data to obtain friction force and friction coefficient. The computer 65 is electrically connected to and controls the motor controller 513, so that accurate control of the motor 512 can be achieved through the computer 65, the reciprocating motion of the cantilever beam 52 and friction generated by the archwire 2 can be accurately controlled according to the requirement of the data acquisition system 6, and the relative position and the relative pressure of the archwire 2 and the bracket 56 can be accurately controlled.
The working process of the orthodontic archwire bracket friction and wear experimental device is as follows:
The triaxial displacement table 51 is adjusted to control the cantilever beam 52 to contact upwards and push against the archwire 2, so that the load between the archwire 2 and the bracket 56 reaches a certain specified value, the motor 512 is started after the motion parameters are set, the motor 512 drives the triaxial translation assembly 511 to start to rotate positively and negatively along the axis of the length direction of the archwire 2, and the triaxial translation assembly 511 drives the cantilever beam 52 to drive the bracket 56 to do low-speed reciprocating friction motion relative to the archwire 2. The data acquisition system 6 displays and records the stress value of the cantilever beam 52 in the form of a voltage value in real time through the strain gauge on the force sensor 61, and calculates the corresponding friction force and friction coefficient between the archwire 2 and the bracket 56.
As shown in fig. 5, the embodiment of the invention further provides a test method based on the above-mentioned archwire bracket friction and wear test device, which comprises the following steps:
S10, clamping and fixing the bracket. The concrete process is, the pin is fixed the bracket fixed block in the recess of placing the platform, and the bracket is placed on the bracket fixed block, then adjusts triaxial displacement platform, makes archwire and bracket accomplish the exact contact, and the tweezers centre gripping bracket is used to this moment and the triaxial displacement platform is adjusted and is made the bracket fixed block descend to have a certain distance with bracket bottom, adjusts triaxial displacement platform after 1~2 drips glue on the bracket fixed block, makes bracket fixed block and bracket bottom contact again and keeps the exact contact of archwire and bracket, waits for glue to solidify, accomplishes bracket fixation.
And S20, clamping and fixing the arch wire, and applying pretightening force through the arch wire fixing pretightening mechanism. The specific process is that one end of the arch wire is arranged in a positioning groove on the upper surface of a pre-tightening sliding block and is fixed by a pressing block, and then the other end of the arch wire is clamped by a clamping head to finish the arch wire fixing; then, a digital display tension meter switch is turned on, a pre-tightening screw is screwed, so that the pre-tightening screw extrudes and pushes a pre-tightening block, the pre-tightening block is pushed to slide along a guide rail, the arch wire is further subjected to stretching pre-tightening, meanwhile, the indication number of the digital display tension meter is observed, when the pre-tightening force reaches a specified value, the pre-tightening screw is stopped being screwed, the pre-tightening block is fixed on a base through a fixing screw, the positioning screw is screwed, the pre-tightening block and the block position are kept unchanged, and the pre-tightening state of the arch wire is maintained; finally, loosening the pre-tightening screw to avoid mechanical damage of the pre-tightening screw and the pre-tightening block, and completing the pre-tightening of the arch wire.
S30, carrying out position adjustment and load application on the bracket. The specific process is that the triaxial displacement table is regulated to control the cantilever beam to contact upwards and push the arch wire, so that the load between the arch wire and the bracket reaches a certain specified value.
S40, starting a friction testing mechanism, and collecting load information and friction force information by a data collecting system; the motor is started after the motion parameters of the motor are set, and the motor drives the triaxial translation assembly to move along the axis along the length direction of the arch wire, so that the triaxial translation assembly drives the cantilever Liang Qudong bracket to do low-speed reciprocating friction motion relative to the arch wire.
S50, the data acquisition system acquires load information and friction information and acquires a friction coefficient through software calculation; the data acquisition system displays and records the stress value of the cantilever beam in a voltage value form in real time through the strain gauge on the force sensor, and obtains the corresponding friction force and friction coefficient between the arch wire and the bracket through software analysis and calculation.
The friction and abrasion experimental device for the orthodontic archwire bracket provided by the invention is used for carrying out low-speed reciprocating friction movements of archwires and brackets of different specifications and materials under different experimental parameter conditions, so that the influence of various factors on the friction force between the archwires and the brackets can be explored, the pretightening force of the archwires in the friction process can be measured in real time by a digital display tension meter, the influence of the pretightening force of the archwires on experimental results can be quantified, the friction archwires of the brackets can be controlled to move, experimental variables can be accurately controlled, the change of the parameters such as pretightening amount caused by the movement of the archwires can be avoided, the influence on the experimental results is caused, and the problems that high-precision test cannot be achieved and accuracy data can not be obtained can be solved; the invention ensures that the experimental result is more reliable and effective, greatly helps to deeply study the influence of the change of the pretightening force on the friction and wear performance of the archwire bracket, and provides a more reliable and effective simulation experimental method for the friction and wear performance study of the archwire bracket.
It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
Claims (8)
1. The friction and wear experimental device for the orthodontic archwire bracket comprises an archwire for orthodontic correction, an experimental table top, an archwire fixing and pre-tightening mechanism fixedly connected to the experimental table top and used for fixing and pre-tightening the archwire, a pre-tightening force testing mechanism fixedly installed on the experimental table top and matched with the archwire fixing and pre-tightening mechanism to clamp and straighten the archwire and simultaneously measure the pre-tightening force of the archwire, a friction testing mechanism fixedly installed on the experimental table top and provided with a cantilever beam and used for applying load to the archwire through the cantilever beam, and a data acquisition system connected with the cantilever beam and used for measuring data after stress feedback of the cantilever beam;
The friction testing mechanism drives the cantilever beam to reciprocate to rub the arch wire along the length direction of the arch wire;
The arch wire fixing and pre-tightening mechanism comprises a base, a guide rail, a pre-tightening slide block, a fixing screw, a positioning screw, a pre-tightening block and a pressing block, wherein the base is positioned on the same side of a cantilever beam and is arranged on an experiment table surface, the guide rail is fixedly connected to the base along the length direction of the arch wire, the pre-tightening slide block is sleeved on the guide rail and slides along the guide rail, the pre-tightening slide block is fixed to the base through a kidney-shaped hole formed in the pre-tightening slide block, the positioning screw is spirally connected to the side surface of the pre-tightening slide block and the tail end of the pre-tightening slide block abuts against the guide rail after being screwed, the pre-tightening block is fixedly connected to the pre-tightening slide block through a threaded hole, and the pressing block is fixedly connected to the pre-tightening slide block and compresses the tail end of the arch wire;
The pretightening force testing mechanism comprises a horizontal testing machine frame fixedly connected to the experiment table surface, a tension meter fixing plate fixedly connected to the horizontal testing machine frame, a digital display tension meter fixedly connected to the tension meter fixing plate, a connecting rod connected to the digital display tension meter, and a chuck fixedly connected to the tail end of the connecting rod, wherein the chuck and the arch wire fixing pretightening mechanism are respectively fixedly connected with the two ends of an arch wire and tighten the arch wire;
One end of the arch wire is arranged in a positioning groove on the upper surface of the pre-tightening sliding block and is fixed by the pressing block, and then the other end of the arch wire is clamped by the clamping head; and then turning on a switch of the digital display tension meter, screwing the pre-tightening screw, extruding and pushing the pre-tightening screw to enable the pre-tightening screw to push the pre-tightening block to slide along the guide rail, further stretching and pre-tightening the arch wire, observing the indication number of the digital display tension meter, stopping screwing the pre-tightening screw when the pre-tightening force reaches a specified value, fixing the pre-tightening slider on the base through the fixing screw, fixing the pre-tightening slider and the guide rail through screwing the positioning screw, thereby keeping the pre-tightening state of the arch wire, and finally loosening the pre-tightening screw.
2. The device for testing the frictional wear of the orthodontic archwire bracket according to claim 1, wherein the frictional testing mechanism comprises a triaxial displacement table fixed on the test table top, a cantilever beam fixedly connected to the triaxial displacement table and driven by the triaxial displacement table to move along three directions of an X axis, a Y axis and a Z axis, a placing table fixedly connected to the tail end of the cantilever beam and in a concave shape, a bracket fixing block fixedly connected to a groove of the placing table, and a bracket positioned in the groove of the placing table and fixedly connected to the bracket fixing block;
the bracket surface is in contact with the archwire and rubs reciprocally along the length of the archwire.
3. The orthodontic archwire bracket frictional wear test device of claim 2, wherein the triaxial displacement table includes a triaxial translation assembly, a motor connected to the triaxial translation assembly and powering the axis of movement along the length of the archwire, and a motor controller electrically connected to and controlling the motor.
4. The orthodontic archwire bracket frictional wear test device of claim 3, wherein the data acquisition system includes a plurality of force sensors fixedly mounted on the cantilever beam, a bridge box electrically connected to the force sensors, a strain amplifier electrically connected to the bridge box, a data acquisition unit electrically connected to the strain amplifier, and a computer electrically connected to the data acquisition unit.
5. The orthodontic archwire bracket frictional wear test device of claim 4, wherein the force sensors are distributed on the upper surface, the lower surface and both sides of the cantilever beam.
6. The orthodontic archwire bracket frictional wear test device of claim 4, wherein the computer controls the motor controller.
7. The orthodontic archwire bracket frictional wear test device of claim 6, wherein the archwire is parallel to the test bench and the archwire length direction is perpendicular to the cantilever beam.
8. A method of testing a dental orthodontic archwire bracket frictional wear test device as defined in any one of claims 1-7, comprising the steps of:
Clamping and fixing the bracket;
clamping and fixing the arch wire, and applying a pretightening force through the arch wire fixing pretightening mechanism;
carrying out position adjustment and load application on the bracket;
Starting a friction testing mechanism;
The data acquisition system acquires load information and friction force information and obtains a friction coefficient through software calculation.
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| CN112393836B (en) * | 2020-12-03 | 2022-01-04 | 北京联袂义齿技术有限公司 | Orthodontic force measuring device for tooth correction |
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