CN115541493B - Method, device and system for measuring smoothness of skin zipper of leg of dummy - Google Patents
Method, device and system for measuring smoothness of skin zipper of leg of dummy Download PDFInfo
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- CN115541493B CN115541493B CN202211496043.4A CN202211496043A CN115541493B CN 115541493 B CN115541493 B CN 115541493B CN 202211496043 A CN202211496043 A CN 202211496043A CN 115541493 B CN115541493 B CN 115541493B
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 210000002414 leg Anatomy 0.000 claims description 75
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000005498 polishing Methods 0.000 description 58
- 210000001699 lower leg Anatomy 0.000 description 40
- 230000005540 biological transmission Effects 0.000 description 21
- 230000033001 locomotion Effects 0.000 description 18
- 238000003825 pressing Methods 0.000 description 17
- 238000012360 testing method Methods 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 4
- 208000027418 Wounds and injury Diseases 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 208000014674 injury Diseases 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 2
- 244000309466 calf Species 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 210000003141 lower extremity Anatomy 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 208000035874 Excoriation Diseases 0.000 description 1
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 210000002303 tibia Anatomy 0.000 description 1
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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
- G01N19/08—Detecting presence of flaws or irregularities
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
- F16B11/006—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- Chemical & Material Sciences (AREA)
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- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention relates to the field of measurement and discloses a method, a device and a system for measuring smoothness of a skin zipper of a leg of a dummy. The method comprises the following steps: the motor is controlled to rotate at a constant speed, so that the push rod is driven by the motor to move along the associated curve groove at a constant speed; the force measuring rod is driven to move at a constant speed through the push rod; the force measuring rod drives the skin zipper of the leg of the dummy to be measured to be pulled or pulled open, and the required pulling force value is recorded; determining the smoothness of the skin zipper of the leg of the dummy according to the tension value; one end of the push rod is arranged in association with the curve groove, the other end of the push rod is fixedly connected with one end of the force measuring rod, the other end of the force measuring rod is fixedly connected with the dummy shank skin zipper, and the contour curve of the curve groove is parallel to the outer contour curve of the dummy shank skin including the zipper area. The embodiment realizes the accurate measurement of the smoothness of the skin zipper of the leg of the dummy.
Description
Technical Field
The invention relates to the field of measurement, in particular to a method, a device and a system for measuring smoothness of a skin zipper of a leg of a dummy.
Background
With the increasing amount of vehicles, traffic accidents frequently occur, and consumers and automobile manufacturers pay more and more attention to the safety performance of automobiles. The application of the automobile crash test dummy can effectively test the safety of the automobile. It is counted that the injury of the lower limbs of the vehicle members accounts for about 36% of the total injury, and is the most vulnerable part in the front collision, so that the method is particularly important for the injury study of the lower limbs of the collision dummy.
Therefore, the skin zipper of the calf of the automobile crash dummy with good flatness and high stability is a basis for improving the accuracy of the automobile crash test result.
In view of this, the present invention has been made.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for measuring smoothness of a skin zipper of a leg of a dummy, a polishing method and a system, and the method and the system realize accurate measurement of smoothness of the skin zipper of the leg of the dummy.
The embodiment of the invention provides a method for measuring smoothness of a skin zipper of a leg of a dummy, which comprises the following steps:
the motor is controlled to rotate at a constant speed, so that the push rod is driven by the motor to move along the associated curve groove at a constant speed;
the force measuring rod is driven to move at a constant speed through the push rod;
the force measuring rod drives the skin zipper of the leg of the dummy to be measured to be pulled or pulled open, and the required pulling force value is recorded;
determining the smoothness of the skin zipper of the leg of the dummy according to the tension value;
one end of the push rod is arranged in association with the curve groove, the other end of the push rod is fixedly connected with one end of the force measuring rod, the other end of the force measuring rod is fixedly connected with the dummy shank skin zipper, and the contour curve of the curve groove is parallel to the outer contour curve of the dummy shank skin including the zipper area.
The embodiment of the invention provides a device for measuring the flatness of a skin zipper of a leg of a dummy, which comprises the following components:
top bracket 41, ball bearing 42, bearing pin 43, push rod 44, sleeve 45, motor 46, fifth bracket 47, zipper pin 48, force measuring bar 49, push rod pin 50, motor bracket 52, sixth bracket 53, first bottom connecting bar pin 54, second bottom connecting bar pin 55, first bottom connecting bar 56, second bottom connecting bar 57, bottom bracket 58, and zipper 59;
wherein the bottom bracket 58, the fifth bracket 47, the sixth bracket 53 and the top bracket 41 are connected to form the main body of the measuring device;
the first bottom connecting rod 56 and the second bottom connecting rod 57 are fixedly connected to the bottom bracket 58, the bearing pin 43 plays a role of connecting the ball bearing 42 and the push rod 44, the bearing pin 43 can move in a curve groove of the top bracket 41, the motor 46 rotates at a constant speed to pull the sleeve 45 to drive the push rod 44 to move, and the contour curve of the curve groove of the top bracket 41 is parallel to the outer contour curve of a zipper 59 area contained in the skin of the lower leg, so that the push rod 44 is kept perpendicular to the bottom bracket 58 in the moving process;
the dummy shank skin piece 51 is fixed by a first bottom connecting rod pin 54, a second bottom connecting rod pin 55, a first bottom connecting rod 56 and a second bottom connecting rod 57.
The embodiment of the invention provides a polishing and bonding system for a skin zipper of a leg of a dummy, which comprises the following steps:
the device comprises a dual-optical axis ball screw device, a polishing device, a shank skin fixing device and a pressing device;
the double-optical axis ball screw device is used for providing a power source for the polishing device so as to drive the polishing device to move;
the polishing device is used for polishing the skin zipper of the leg of the dummy to be treated under the drive of the double-optical axis ball screw device;
the shank skin fixing device is used for fixing a dummy shank skin piece to be treated;
the pressing device is used for pressing a connection area between the glued dummy shank skin zipper and the skin so as to bond the dummy shank skin zipper and the skin, wherein after the connection area between the dummy shank skin zipper and the skin is polished, glue is applied to the connection area.
The embodiment of the invention provides a method for polishing and bonding skin of a leg of a dummy, which comprises the following steps:
acquiring an outer contour curve of a connecting area between the skin of the leg of the dummy to be treated and a zipper of the leg through a three-dimensional scanner;
fixing the leg skin of the dummy to be treated through a leg skin fixing device;
controlling a polishing head of a polishing device to move to an initial position, and controlling a moving track of the polishing head of the polishing device through a double-optical axis ball screw device according to the outer contour curve so that the polishing head of the polishing device polishes a connection area between the skin of the leg of the dummy and the zipper of the leg according to the outer contour curve;
gluing the polished connection area;
the moving track of the compressing head of the compressing device is controlled through the double-optical axis ball screw device, so that the compressing head of the compressing device compresses the skin of the leg of the dummy and the zipper of the leg according to the outline curve, and the zipper of the leg is adhered to the skin of the leg of the dummy.
The embodiment of the invention has the following technical effects:
the motor is controlled to rotate at a constant speed so as to drive the push rod to move along the associated curved groove at a constant speed; the force measuring rod is driven to move at a constant speed through the push rod; the force measuring rod drives the skin zipper of the leg of the dummy to be measured to be pulled or pulled open, and the required pulling force value is recorded;
and determining the smoothness of the skin zipper of the leg of the dummy according to the tension value, and realizing the accurate measurement of the smoothness of the skin zipper of the leg of the dummy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for measuring smoothness of a skin zipper of a leg of a dummy according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a device for measuring flatness of a skin zipper of a leg of a dummy according to an embodiment of the present invention;
fig. 3, fig. 4 and fig. 5 are schematic structural diagrams of a polishing and bonding system for a skin zipper of a leg of a dummy under different viewing angles according to an embodiment of the present invention;
FIG. 6 is a flowchart of a method for skin abrasion and adhesion of a leg of a dummy according to an embodiment of the present invention;
FIG. 7 is a flow chart of acquiring an outer contour curve of a connection region between the skin of a leg of a dummy to be treated and a zipper of the leg by a three-dimensional scanner according to an embodiment of the present invention;
fig. 8 is a schematic diagram of movement control of a polishing head of a polishing device and movement control of a compacting head of a compacting device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the invention, are within the scope of the invention.
Fig. 1 is a flowchart of a method for measuring smoothness of a skin zipper of a leg of a dummy according to an embodiment of the present invention. Referring to fig. 1, the method for measuring smoothness of the skin zipper of the leg of the dummy specifically comprises the following steps:
s110, controlling the motor to rotate at a constant speed so as to drive the push rod to move along the associated curved slot at a constant speed through the motor.
And S120, driving the force measuring rod to move at a constant speed through the push rod.
S130, driving the skin zipper of the leg of the dummy to be measured to be pulled or pulled through the force measuring rod, and recording a required pulling force value.
And S140, determining the smoothness of the skin zipper of the leg of the dummy according to the tension value.
Optionally, the determining the smoothness of the skin zipper of the leg of the dummy according to the tension value includes:
counting the maximum value and the minimum value in the tension values;
determining a difference between the maximum and minimum values;
determining said dummy shank skin zipper flatness from said maximum and said difference.
For example, if the maximum value is less than a first threshold and the difference is less than a second threshold, then determining that the skin smoothness of the leg of the dummy is within a qualified range, wherein the first threshold is greater than the second threshold.
By adopting an automatic means, objective measurement of the smoothness of the skin zipper of the leg of the dummy is realized, and compared with artificial subjective measurement, the measurement accuracy is improved.
Optionally, referring to a device for measuring flatness of skin zippers of a leg of a dummy as shown in fig. 2, comprising:
top bracket 41, ball bearing 42, bearing pin 43, push rod 44, sleeve 45, motor 46, fifth support bracket 47, zipper pin 48, force measuring bar 49, push rod pin 50, motor bracket 52, sixth support bracket 53, first bottom connecting bar pin 54, second bottom connecting bar pin 55, first bottom connecting bar 56, second bottom connecting bar 57, bottom bracket 58, and zipper 59.
Wherein the bottom bracket 58, the fifth bracket 47, the sixth bracket 53 and the top bracket 41 are connected to form the main body of the measuring device. The first bottom connecting rod 56 and the second bottom connecting rod 57 are fixedly connected to the bottom bracket 58, the bearing pin 43 plays a role of connecting the ball bearing 42 and the push rod 44, the bearing pin 43 can move in the curved slot of the top bracket 41, the motor 46 rotates at a constant speed to pull the sleeve 45 to drive the push rod 44 to move, and the contour curve of the curved slot of the top bracket 41 is parallel to the outer contour curve of the zipper 59 area contained in the skin of the lower leg, so that the push rod 44 is kept perpendicular to the bottom bracket 58 in the moving process. The dummy shank skin piece 51 is fixed by a first bottom connecting rod pin 54, a second bottom connecting rod pin 55, a first bottom connecting rod 56 and a second bottom connecting rod 57.
When the smoothness of the skin zipper of the leg of the dummy is measured, the motor 46 rotates at a constant speed to pull the sleeve 45 to drive the push rod 44 to move, smoothness of the bonded skin zipper of the leg is measured through the force measuring rod 49, and the smoothness is determined by whether the pulling peak value Fmax and the peak value Fpp are in a required range or not and is used for evaluating the smoothness of the bonded zipper. The measuring method comprises the steps of keeping the measuring rod 49 and a measured plane in parallel as far as possible, keeping the pushrod 44 moving at a constant speed because the motor 46 rotates at a constant speed, recording the number of the measuring rod 49 as F, obtaining a change chart of the magnitude relation between the number of the tension meter F and the time t, obtaining two parameters of a maximum value Fmax and a minimum value Fmin according to the change chart, enabling Fpp=fmax-Fmin, and determining the bonded zipper in the state as a qualified product when Fmax is smaller than 90N and Fpp is smaller than 30N, otherwise, determining the bonded zipper as a disqualified product.
In particular, in order to ensure the correct installation of the skin of the leg of the dummy, the connection area between the zipper of the leg and the skin needs to be pre-polished, and the zipper of the leg is glued and bonded after polishing is finished, so that the positioning and connection effects are achieved, and then the zipper of the leg is sewn. At present, aiming at the skin piece of the type, common clamping equipment is difficult to be qualified, and secondly, related skin pieces are mainly polished and bonded by manual labor at present, and the defects of large polishing workload, low efficiency, difficult product quality assurance, poor product consistency and the like exist in manual polishing. The existing dummy shank skin zipper is inaccurate in manual positioning in the bonding process, the zipper can be bonded and deviated, so that the zipper sewing path is uneven, the surface of the sewn zipper is uneven, and the stability is poor.
Aiming at the problems, the embodiment of the invention also provides a system for polishing and bonding the skin zipper of the dummy shank, which aims to solve the problems that in the process of polishing the skin of the dummy shank and bonding the zipper of the dummy shank during the collision of an automobile at present, the manual polishing of the skin of the dummy shank has large workload and low efficiency, the quality of products is difficult to ensure, the consistency of the products is poor, and the like. In other words, the polishing and bonding system and method for the skin zipper of the dummy shank provided by the embodiment of the invention can improve the polishing and bonding quality of the skin of the shank and the problem of poor consistency of products, improve the working efficiency, obtain the skin zipper of the dummy shank of the automobile collision with good flatness and high stability, and improve the accuracy of the automobile collision test result.
Specifically, the embodiment of the invention also provides a polishing and bonding system for the skin zipper of the leg of the dummy, which comprises the following steps: the device comprises a dual-optical axis ball screw device, a polishing device, a shank skin fixing device and a pressing device. The double-optical axis ball screw device is used for providing a power source for the polishing device so as to drive the polishing device to move; the polishing device is used for polishing the skin zipper of the leg of the dummy to be treated under the drive of the double-optical axis ball screw device; the shank skin fixing device is used for fixing a dummy shank skin piece to be treated; the pressing device is used for pressing a connection area between the glued dummy shank skin zipper and the skin so as to bond the dummy shank skin zipper and the skin, wherein after the connection area between the dummy shank skin zipper and the skin is polished, glue is applied to the connection area.
Optionally, referring to the schematic structural view of the artificial calf skin zipper sanding bonding system as shown in fig. 3, 4 and 5, the support device includes: a bottom plate 1, a first support frame 2, a second support frame 3, a third support frame 4 and a fourth support frame 5.
The dual-optical axis ball screw device includes: the first optical axis 6 of the double-optical axis ball screw device, the second optical axis 7 of the double-optical axis ball screw device, the screw 8 of the double-optical axis ball screw device, the first lug 9 of the double-optical axis ball screw device, the second lug 10 of the double-optical axis ball screw device and the stepping motor 39. The polishing device comprises: the polishing device comprises a polishing device base 11, a polishing device polishing head 12, a polishing head base bayonet lock 13, a polishing head bayonet lock 14, a polishing head front roller 15 and a polishing head front roller pin 16.
The stepper motor 39 drives the screw 8 of the dual-axis ball screw device to rotate forward and backward through the coupler, the first lug 9 of the dual-axis ball screw device is connected with the base 11 of the polishing device, and the polishing device is driven to move through the movement of the first lug 9 of the dual-axis ball screw device.
The compressing apparatus includes: the device comprises a pressing device base 17, a pressing device pressing head 18, a pressing device clamping groove pin 19 and a pressing head front roller 20;
the shank skin fixing device comprises a first clamping seat 21 with a transverse bottom plate groove, a second clamping seat 22 with a transverse bottom plate groove, a first clamping seat connector 23 with a transverse bottom plate groove, a second clamping seat connector 24 with a transverse bottom plate groove, a first clamping seat 25 with a longitudinal bottom plate groove, a second clamping seat 26 with a longitudinal bottom plate groove, a first clamping seat connector 27 with a longitudinal bottom plate groove, a second clamping seat connector 28 with a longitudinal bottom plate groove, a first clamping seat flange 29 with a longitudinal bottom plate groove, a second clamping seat flange 30 with a longitudinal bottom plate groove, a first clamping seat flange fixing bolt 31, a second clamping seat flange fixing bolt 32, a screw 33 with a longitudinal bottom plate groove, a shank bone 34 of a collision dummy, a first clamping plate 35 with shank skin of the collision dummy, a second clamping plate 36 with shank skin of the collision dummy, and a middle baffle 37 with shank skin of the collision dummy.
The first transverse groove clamping seat 21, the second transverse groove clamping seat 22, the first transverse groove clamping seat connector 23, the second transverse groove clamping seat connector 24, the first longitudinal groove clamping seat 25, the second longitudinal groove clamping seat 26, the first longitudinal groove clamping seat connector 27 and the second longitudinal groove clamping seat connector 28 can be moved and adjusted perpendicular to the direction of the bottom plate 1 and are adjusted parallel to the sliding of the transverse groove and the longitudinal groove of the bottom plate, and the screw 33 of the longitudinal groove of the bottom plate adopts a structure with the front half section and the rear half section of reverse threads, so that the first longitudinal groove clamping seat 25 of the bottom plate and the second longitudinal groove clamping seat 26 are relatively close or relatively far away through the rotation of the screw 33 of the longitudinal groove of the bottom plate.
The power source device (i.e., the dual-optical axis ball screw device) selects a ball screw, which can convert rotary motion into linear motion or torque into axial repeated acting force, and has the characteristics of high precision, reversibility and high efficiency. The ball screw is used as a driving body, the nut can be converted into linear motion along with the rotation angle of the screw according to the lead of the corresponding specification, and the driven workpiece can be connected with the nut through the nut seat, so that the corresponding linear motion is realized. Arc-shaped spiral grooves are respectively machined on the screw rod and the nut, a spiral rollaway nest is formed by combining the two arc-shaped lattices, and balls are arranged in the rollaway nest. When the screw rod rotates relative to the nut, the balls roll in the spiral roller path to force the screw rod and the spiral roller path to move when the screw rod and the spiral roller path are axially mutually opposite. In order to prevent the balls from rolling out of the nut, return guide devices are arranged at two ends of the spiral groove of the nut, so that the balls can return to the screw nut to form a closed loop. Since rolling friction exists between the screw and the nut, sliding friction exists only between the balls, and thus the ball screw pair has the following advantages: 1. no side gap, high axial rigidity and high reverse positioning precision. The ball screw pair can apply pretightening force and eliminate axial clearance, so that the axial rigidity is high, no idle stroke (dead zone) exists during reversing, and the positioning accuracy is high. 2. Sensitive movement and no creeping at low speed. Because the static friction coefficient and the dynamic friction coefficient are small and the difference value between the static friction coefficient and the dynamic friction coefficient is also small, the starting torque is small, namely the power required for achieving the same movement result is far lower than that of a sliding screw, and the movement is sensitive. 3. A plurality of balls are arranged between a screw shaft and a screw nut of the ball screw device to do rolling motion, compared with sliding friction between common sliding screw components, the friction loss is small, the transmission efficiency is high, and high-speed feeding motion can be realized. 4. The transmission has reversibility, can not be self-locked, and can not be self-locked due to small friction coefficient. Therefore, in some cases, such as transmission of vertical movement, it is necessary to add a braking device or a reverse rotation preventing device to prevent the automatic lowering of the table or the like due to its own weight. 5. Because the rolling friction is mainly adopted between the ball screw components, the friction loss is small, the service life is long, the use is simple, and the daily maintenance cost is low.
The gear transmission is selected to be realized because the gear transmission has the following characteristics: 1. the transmission precision is high. Belt drives do not guarantee an accurate transmission ratio nor do chain drives achieve a constant instantaneous transmission ratio, but the transmission ratio of the involute gears commonly used in modern times is theoretically accurate and constant. The device is not only a key requirement for precision machinery and instruments, but also an important condition for reducing dynamic load and realizing stable transmission under high-speed and heavy load. 2. The application range is wide. The power range transmitted by the gear transmission is extremely wide and can be from 0.001W to 60000kW; the circumferential speed can be very low and can be as high as 150m/s, and the belt transmission and the chain transmission are difficult to compare. 3. The transmission between any two shafts in the space of parallel shafts, intersecting shafts, staggered shafts and the like can be realized, which is also not done by belt transmission and chain transmission. 4. Reliable operation and long service life. 5. The transmission efficiency is higher, generally 0.94-0.99. 6. The manufacturing and installation requirements and thus the costs are high. 7. The requirements on environmental conditions are strict, and besides few conditions of low speed and low precision, the device is generally required to be arranged in a box cover for dust prevention and scale prevention, and lubrication needs to be emphasized. 8. Not suitable for transmission between two shafts which are far apart. 9. Vibration damping and impact resistance are not as good as in flexible transmissions such as belt transmissions.
Further, an embodiment of the present invention further provides a method for polishing and adhering skin of a leg of a dummy, which is applied to the above system, as shown in fig. 6, and the method includes:
s610, acquiring an outer contour curve of a connecting area between the skin of the leg of the dummy to be treated and the zipper of the leg through a three-dimensional scanner.
S620, fixing the leg skin of the dummy to be treated through the leg skin fixing device.
And S630, controlling the polishing head of the polishing device to move to an initial position, and controlling the moving track of the polishing head of the polishing device through a double-optical axis ball screw device according to the outer contour curve, so that the polishing head of the polishing device polishes the connection area between the skin of the leg of the dummy and the zipper of the leg according to the outer contour curve.
And S640, gluing the polished connection area.
S650, controlling the moving track of the pressing head of the pressing device through the double-optical axis ball screw device, so that the pressing head of the pressing device presses the leg skin of the dummy and the leg zipper according to the outer contour curve, and the leg zipper is adhered to the leg skin of the dummy.
Illustratively, as shown in fig. 7, the step of acquiring the outer contour curve of the connecting area between the skin of the leg of the dummy to be treated and the zipper of the leg by using a three-dimensional scanner includes the following steps:
s710, calibrating and calibrating the three-dimensional scanner.
S720, performing surface treatment on the skin of the lower leg.
And S730, capturing three-dimensional data from different angles.
S740, extracting the shank skin point cloud data.
S750, noise removal, hole filling and fairing processing are carried out.
S760, obtaining a three-dimensional model of the skin of the lower leg.
S770, deriving a skin contour curve of the lower leg.
Specifically, the three-dimensional scanner is calibrated first to ensure the stability of the environment, avoid the influence of the environment to the greatest extent, such as the light environment, reduce the influence caused by external environmental factors, calculate the position of the scanning device relative to the scanned object according to the preset mode of the scanner, carefully calibrate the instrument, and then perform surface treatment on the skin of the lower leg, so that a layer of developer is sprayed on objects with luster or darker color before the objects are scanned, the scanned object needs to be scanned at different angles by the three-dimensional scanner, and the direction of the three-dimensional scanner and the placement position of the scanned object need to be adjusted for better omnibearing scanning. The method mainly comprises the following steps of carrying out post-processing work after scanning, namely, carrying out point cloud processing, correcting acquired brightness values, manually eliminating some miscellaneous points far away from a part main body, and carrying out smoothing processing by adopting a triangle patch which is the minimum unit divided in a patch of a polygonal grid for representing the method more simply, flexibly and conveniently describing topology, enabling software to automatically scan the reference distance of the point cloud, converting a set of point coordinate data into a polygon according to the operation, and then deleting redundant patches. After the shank skin point cloud data are extracted, the steps of removing noise points, filling holes, smoothing and the like are carried out, a shank skin three-dimensional model is obtained, and a shank skin contour curve is derived.
In summary, the obtaining, by a three-dimensional scanner, an outer contour curve of a connection region between a skin of a leg of a dummy to be treated and a zipper of the leg, includes: calibrating the three-dimensional scanner;
surface treatment is carried out on the skin of the leg of the dummy so as to improve the sensitivity of the skin of the leg of the dummy to laser; three-dimensional data acquisition is carried out on the leg skin of the dummy from different angles; extracting point cloud data of the skin of the leg of the dummy based on the acquired three-dimensional data; denoising the point cloud data to obtain a three-dimensional model of the leg skin of the dummy; and acquiring an outer contour curve of the connecting area based on the three-dimensional model.
In particular, when the stepping angle of the stepping motor is B, the pulse equivalent is δ, the pitch of the screw of the two-axis ball screw device is K, the number of input pulses per rotation of the screw of the two-axis ball screw device is P1, and the number of input pulses per rotation of the stepping motor is P2, the following relation is given:
P1=K/δ，P2=360°/B；
the screw transmission ratio i2 of the dual-optical axis ball screw device is as follows: i2 =360×δ/k×b.
Further, referring to fig. 8, the process of controlling the movement of the grinding head of the grinding device and the movement of the pressing head of the pressing device is specifically:
taking A (0, 0) as an origin, taking the left direction as the positive X-axis direction, taking the downward direction as the positive Y-axis direction, establishing a plane rectangular coordinate system, wherein a contour curve obtained by three-dimensional scanning of a shank skin piece is an edge to be polished, and can be regarded as a set formed by infinite coordinate points, taking a point B (X1, Y1) as an example, setting the distance between a polishing head of a polishing device or a compacting head of a compacting device and the X-axis at an initial position as Y0, setting the extension length of the polishing head or the compacting head as Y, setting the distance of the polishing head or the compacting head moving leftwards relative to the origin as X, and then having the following relation: x=x1, y=y1-y0. The base of the polishing device and the top screw rod drive the grinding head to integrally move left and right through the rotation of the motor, and when the motor driving the screw rod to rotate performs uniform rotation, the screw rod performs rotation around the axis of the screw rod at the same angular speed, so that the grinding head is driven to integrally perform uniform linear motion. By varying the distance x by which the grinding head moves to the left relative to the origin, as a function of the motor operating time t, the grinding head extension y also varies, since x is a function of t, given its correspondence x=f (t). Let the screw pitch of top screw be K, the motor rotational speed be nr/s, then have x=f (t) =n×t×K, the flexible motion of bistrique adopts rack and pinion control, rack and bistrique connect into an entirety.
The technical scheme of the embodiment of the invention adopts a reasonable mechanical structure and a measuring method, is applied to the process of polishing the skin of the leg of the dummy and bonding the zipper, can accurately position the skin parts of the leg, finishes polishing the skin of the leg of the dummy through the slow movement of the top double-optical axis ball screw device and the polishing head moving according to the curve of the outer contour of the skin of the leg, can replace manual work through the measures, improves polishing efficiency, ensures high quality and better consistency of products, obtains the automobile collision leg skin zipper with good flatness and high stability, and improves the accuracy of automobile collision test results.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present application. As used in the specification and in the claims, the terms "a," "an," "the," and/or "the" are not specific to a singular, but may include a plurality, unless the context clearly dictates otherwise. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method or apparatus comprising such elements.
It should also be noted that the positional or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention.
Claims (3)
1. The utility model provides a dummy shank skin zip fastener smoothness measuring device which characterized in that includes:
top bracket (41), ball bearing (42), bearing pin (43), push rod (44), sleeve (45), motor (46), fifth support (47), zipper pin (48), force measuring rod (49), push rod pin (50), motor bracket (52), sixth support (53), first bottom connecting rod pin (54), second bottom connecting rod pin (55), first bottom connecting rod (56), second bottom connecting rod (57), bottom bracket (58) and zipper (59);
wherein the bottom bracket (58), the fifth supporting frame (47), the sixth supporting frame (53) and the top bracket (41) are connected to form the main body of the measuring device;
the first bottom connecting rod (56) and the second bottom connecting rod (57) are fixedly connected to the bottom bracket (58), the bearing pin (43) plays a role of connecting the ball bearing (42) and the push rod (44), the bearing pin (43) moves in a curve groove of the top bracket (41), the motor (46) rotates the pulling sleeve (45) at a constant speed to drive the push rod (44) to move, and the contour curve of the curve groove of the top bracket (41) is parallel to the outer contour curve of a zipper (59) region contained in the skin of the lower leg, so that the push rod (44) is kept perpendicular to the bottom bracket (58) in the moving process;
the dummy shank skin piece (51) is fixed by a first bottom connecting rod pin (54), a second bottom connecting rod pin (55), a first bottom connecting rod (56) and a second bottom connecting rod (57).
2. A method for measuring smoothness of a skin zipper of a leg of a dummy applied to the device for measuring smoothness of a skin zipper of a leg of a dummy according to claim 1, comprising:
the motor (46) is controlled to rotate at a constant speed, so that the push rod (44) is driven by the motor (46) to move along the associated curve groove at a constant speed;
the force measuring rod (49) is driven to move at a constant speed through the push rod (44);
the force measuring rod (49) drives the skin zipper of the leg of the dummy to be measured to be pulled or pulled open, and the required pulling force value is recorded;
determining the smoothness of the skin zipper of the leg of the dummy according to the tension value;
one end of the push rod (44) is arranged in association with the curve groove, the other end of the push rod (44) is fixedly connected with one end of the force measuring rod (49), the other end of the force measuring rod (49) is fixedly connected with the skin zipper of the dummy shank, and the contour curve of the curve groove is parallel to the outer contour curve of the skin of the dummy shank including the zipper area.
3. The method of claim 2, wherein said determining said dummy shank skin zipper flatness from said pull force value comprises:
counting the maximum value and the minimum value in the tension values;
determining a difference between the maximum and minimum values;
determining said dummy shank skin zipper flatness from said maximum and said difference.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211496043.4A CN115541493B (en) | 2022-11-28 | 2022-11-28 | Method, device and system for measuring smoothness of skin zipper of leg of dummy |
| CN202310143116.XA CN116000747A (en) | 2022-11-28 | 2022-11-28 | Polishing and bonding system and method for skin zipper of leg of dummy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211496043.4A CN115541493B (en) | 2022-11-28 | 2022-11-28 | Method, device and system for measuring smoothness of skin zipper of leg of dummy |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310143116.XA Division CN116000747A (en) | 2022-11-28 | 2022-11-28 | Polishing and bonding system and method for skin zipper of leg of dummy |
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| CN115541493A CN115541493A (en) | 2022-12-30 |
| CN115541493B true CN115541493B (en) | 2023-04-28 |
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| CN202211496043.4A Active CN115541493B (en) | 2022-11-28 | 2022-11-28 | Method, device and system for measuring smoothness of skin zipper of leg of dummy |
| CN202310143116.XA Pending CN116000747A (en) | 2022-11-28 | 2022-11-28 | Polishing and bonding system and method for skin zipper of leg of dummy |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4206669A (en) * | 1978-11-15 | 1980-06-10 | Scovill Manufacturing Company | Apparatus for gapping zipper chain |
| CN102495069B (en) * | 2011-12-07 | 2013-03-20 | 广东辉丰科技股份有限公司 | Method for detecting defects of chain belts of zipper on basis of digital image processing |
| CN114000270B (en) * | 2020-07-28 | 2023-06-13 | Ykk株式会社 | Material clamping system for hemming device of cloth shade with zipper |
| CN215573702U (en) * | 2021-01-07 | 2022-01-18 | 东莞现代产品整理服务有限公司 | Zipper fatigue resistance testing equipment |
| CN114295355A (en) * | 2021-12-28 | 2022-04-08 | 江苏国范智能科技有限公司 | Zipper smoothness detection device and detection method |
| CN114377998B (en) * | 2022-01-11 | 2024-03-26 | 江苏国范智能科技有限公司 | Zipper detection and removal device and detection and separation method |
| CN217006930U (en) * | 2022-03-10 | 2022-07-19 | 浙江龙辉机械制造有限公司 | A lack tooth detection device for zip fastener |
| CN114753063B (en) * | 2022-04-22 | 2023-07-28 | 中汽研汽车检验中心（天津）有限公司 | Auxiliary device for sewing dummy during automobile collision, control method and use method thereof |
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| CN116000747A (en) | 2023-04-25 |
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