CN115541493A - Method, device and system for measuring smoothness of zipper on skin of shank of dummy - Google Patents
Method, device and system for measuring smoothness of zipper on skin of shank of dummy Download PDFInfo
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- CN115541493A CN115541493A CN202211496043.4A CN202211496043A CN115541493A CN 115541493 A CN115541493 A CN 115541493A CN 202211496043 A CN202211496043 A CN 202211496043A CN 115541493 A CN115541493 A CN 115541493A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 210000001699 lower leg Anatomy 0.000 claims abstract description 148
- 238000005498 polishing Methods 0.000 claims description 75
- 238000003825 pressing Methods 0.000 claims description 37
- 230000033001 locomotion Effects 0.000 claims description 25
- 230000005540 biological transmission Effects 0.000 claims description 23
- 230000003287 optical effect Effects 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- 244000309466 calf Species 0.000 claims description 9
- 230000009977 dual effect Effects 0.000 claims description 6
- 238000004026 adhesive bonding Methods 0.000 claims description 4
- 238000004381 surface treatment Methods 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 210000002303 tibia Anatomy 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 206010061225 Limb injury Diseases 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 210000003141 lower extremity Anatomy 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000009193 crawling Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006378 damage Effects 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
- 230000000694 effects Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 210000001930 leg bone Anatomy 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005461 lubrication Methods 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
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
-
- 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
-
- 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
-
- 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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- General Physics & Mathematics (AREA)
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- Biochemistry (AREA)
- Analytical Chemistry (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- 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 the smoothness of a zipper on the skin of a lower leg of a dummy. The method comprises the following steps: controlling the motor to rotate at a constant speed so as to drive the push rod to move at a constant speed along the associated curved slot through the motor; the push rod drives the force measuring rod to move at a constant speed; the force measuring rod drives the zipper of the skin of the crus of the dummy to be measured to be closed or opened, and the required pulling force value is recorded; determining the smoothness of the zipper of the skin of the lower leg of the dummy according to the pulling force value; one end of the push rod is arranged in a manner of being associated 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 zipper of the skin of the lower leg of the dummy, and the contour curve of the curve groove is parallel to the contour curve of the area, containing the zipper, of the skin of the lower leg of the dummy. The embodiment realizes the accurate measurement of the smoothness of the zipper on the skin of the lower 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 the smoothness of a zipper on the skin of a lower leg of a dummy.
Background
With the increasing quantity of vehicles kept, traffic accidents frequently occur, and consumers and automobile manufacturers increasingly attach importance to the safety performance of automobiles. The application of the dummy for the automobile crash test can effectively test the safety of the automobile. According to statistics, the lower limb injury of the adult in the automobile accounts for about 36% of the total injury, and is the most vulnerable part in the front collision, so the lower limb injury research method is particularly important for the lower limb injury research of the collision dummy.
Therefore, the shank skin zipper of the automobile crash dummy, which is good in flatness and high in stability, is the basis for improving the accuracy of the automobile crash test result.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method, a polishing method and a system for measuring the smoothness of the zipper on the skin of the lower leg of the dummy, so that the smoothness of the zipper on the skin of the lower leg of the dummy can be accurately measured.
The embodiment of the invention provides a method for measuring the smoothness of a zipper on the skin of a dummy shank, which comprises the following steps:
controlling the motor to rotate at a constant speed so as to drive the push rod to move at a constant speed along the associated curved slot through the motor;
the push rod drives the force measuring rod to move at a constant speed;
the force measuring rod drives the zipper of the skin of the crus of the dummy to be measured to be pulled in or pulled out, and the required pulling force value is recorded;
determining the smoothness of the zipper of the skin of the shank of the dummy according to the pulling force value;
one end of the push rod is arranged in a manner of being associated 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 zipper of the skin of the lower leg of the dummy, and the contour curve of the curve groove is parallel to the contour curve of the area, containing the zipper, of the skin of the lower leg of the dummy.
The embodiment of the invention provides a device for measuring the smoothness of a zipper on the skin of a lower leg of a dummy, which comprises:
a top bracket 41, a ball bearing 42, a bearing pin 43, a push rod 44, a sleeve 45, a motor 46, a fifth support bracket 47, a zipper pin 48, a force measuring rod 49, a push rod pin 50, a motor bracket 52, a sixth support bracket 53, a first bottom connecting rod pin 54, a second bottom connecting rod pin 55, a first bottom connecting rod 56, a second bottom connecting rod 57, a bottom bracket 58 and a zipper 59;
wherein, the bottom bracket 58, the fifth bracket 47, the sixth bracket 53 and the top bracket 41 are connected to form a 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 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, the contour curve of the curved groove of the top bracket 41 is parallel to the contour curve of the area of the zipper 59 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 lower leg skin member 51 is fixed by the first bottom link pin 54, the second bottom link pin 55, the first bottom link 56, and the second bottom link 57.
The embodiment of the invention provides a polishing and bonding system for a zipper of the skin of a lower leg of a dummy, which comprises:
the device comprises a double-optical-axis ball screw device, a polishing device, a crus 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 lower leg of the dummy to be treated under the driving of the double-optical-axis ball screw device;
the shank skin fixing device is used for fixing a shank skin piece of the dummy to be treated;
the compressing device is used for compressing a connecting area between the glued artificial shank skin zipper and the skin so as to enable the artificial shank skin zipper to be bonded with the skin, wherein after the connecting area between the artificial shank skin zipper and the skin is polished, glue is applied to the connecting area.
The embodiment of the invention provides a polishing and bonding method for the skin of a lower leg of a dummy, which comprises the following steps:
acquiring an outer contour curve of a connecting area between the skin of the crus of the dummy to be treated and the crus zipper through a three-dimensional scanner;
fixing the crus skin of the dummy to be treated by the crus skin fixing device;
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 connecting area between the shank skin and the shank zipper of the dummy according to the outer contour curve;
gluing the polished connecting area;
the moving track of the pressing head of the pressing device is controlled through the double-optical-axis ball screw device, so that the pressing head of the pressing device presses the shank skin and the shank zipper of the dummy according to the outline curve, and the shank zipper is bonded on the shank skin of the dummy.
The embodiment of the invention has the following technical effects:
the motor is controlled to rotate at a constant speed, so that the push rod is driven by the motor to move at a constant speed along the associated curved groove; the push rod drives the force measuring rod to move at a constant speed; the force measuring rod drives the zipper of the skin of the crus of the dummy to be measured to be closed or opened, and the required pulling force value is recorded;
and determining the smoothness of the zipper on the skin of the lower leg of the dummy according to the pulling force value, thereby realizing the accurate measurement of the smoothness of the zipper on the skin of the lower 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 used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a method for measuring the smoothness of a zipper on the skin of a lower leg of a dummy according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a device for measuring the smoothness of a zipper on the skin of a lower leg of a dummy according to an embodiment of the present invention;
FIG. 3, FIG. 4 and FIG. 5 are schematic structural views of a polishing and bonding system for a zipper for polishing the skin of a lower leg of a dummy at different viewing angles according to an embodiment of the present invention;
FIG. 6 is a flow chart of a method for polishing and bonding the skin of a lower leg of a dummy according to an embodiment of the present invention;
FIG. 7 is a flow chart of the method for acquiring the outline curve of the connecting area between the skin of the lower leg of the dummy to be processed and the lower leg zipper through the three-dimensional scanner according to the embodiment of the invention;
fig. 8 is a schematic diagram of the movement control of the grinding head of the grinding device and the movement control of the pressing head of the pressing device provided by the embodiment of the 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 is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
FIG. 1 is a flowchart of a method for measuring the smoothness of a zipper on the skin of a lower leg of a dummy according to an embodiment of the present invention. Referring to fig. 1, the method for measuring the smoothness of the zipper on the skin of the lower leg of the dummy specifically comprises the following steps:
and S110, controlling the motor to rotate at a constant speed so as to drive the push rod to move at a constant speed along the associated curved groove through the motor.
And S120, driving the force measuring rod to move at a constant speed through the push rod.
S130, the force measuring rod drives the zipper of the skin of the lower leg of the dummy to be measured to be closed or opened, and the required pulling force value is recorded.
And S140, determining the smoothness of the zipper of the skin of the lower leg of the dummy according to the pulling force value.
Optionally, the determining the smoothness of the zipper of the skin of the lower leg of the dummy according to the pulling force value includes:
counting the maximum value and the minimum value in the tension values;
determining a difference between the maximum and minimum values;
and determining the smoothness of the zipper of the skin of the lower leg of the dummy according to the maximum value and the difference.
For example, if the maximum value is smaller than a first threshold value and the difference is smaller than a second threshold value, it is determined that the skin smoothness of the lower leg of the dummy is within a qualified range, wherein the first threshold value is larger than the second threshold value.
The objective measurement of the zipper smoothness of the skin of the crus of the dummy is realized by adopting an automatic means, and compared with artificial subjective measurement, the measurement precision is improved.
Optionally, referring to fig. 2, the device for measuring the smoothness of the zipper on the skin of the lower leg of the dummy comprises:
a top bracket 41, a ball bearing 42, a bearing pin 43, a push rod 44, a sleeve 45, a motor 46, a fifth support bracket 47, a zipper pin 48, a force measuring rod 49, a push rod pin 50, a motor bracket 52, a sixth support bracket 53, a first bottom connecting rod pin 54, a second bottom connecting rod pin 55, a first bottom connecting rod 56, a second bottom connecting rod 57, a bottom bracket 58 and a zipper 59.
Wherein, the bottom bracket 58, the fifth support bracket 47, the sixth support 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 groove of the top bracket 41, the electric motor 46 rotates at a constant speed to pull the sleeve 45 to drive the push rod 44 to move, the contour curve of the curved groove of the top bracket 41 is parallel to the contour curve of the area of the zipper 59 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's calf skin piece 51 is fixed by the first bottom connecting rod pin 54, the second bottom connecting rod pin 55, the first bottom connecting rod 56 and the second bottom connecting rod 57.
When the smoothness of the lower leg skin zipper 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, the smoothness of the bonded lower leg skin zipper is measured through the force measuring rod 49, and the smoothness is determined through whether the pulling force peak value Fmax and the peak value Fpp are in the required range or not and is used for evaluating the smoothness of the bonded zipper. During measurement, the force measuring rod 49 and a measured plane are kept as parallel as possible, the push rod 44 is approximately kept to move at a constant speed due to the fact that the motor 46 rotates at a constant speed, the number of the force measuring rod 49 is recorded as F, a size relation change diagram between the number F of the tension meter and the used time t is obtained, two parameters of the maximum value Fmax and the minimum value Fmin can be obtained according to the diagram, fpp = Fmax-Fmin, and when Fmax is less than 90N and Fpp is less than 30N, the zipper which is well bonded in the state is determined to be a qualified product, otherwise, the zipper is an unqualified product.
Particularly, in order to ensure the correct installation of the skin of the lower leg of the dummy, the connecting area between the lower leg zipper and the skin needs to be pre-polished, gluing and bonding are carried out after polishing is finished, and then the positioning and connecting functions are achieved, and then the lower leg zipper is sewn. At present to the skin spare of this type, ordinary centre gripping equipment is difficult to competent, secondly, mainly relies on artifical manual polishing and the bonding of carrying out relevant skin spare at present, and the manual work of polishing exists that the work load is big, inefficiency, product quality is difficult to guarantee and defects such as product uniformity is poor. The existing dummy shank skin zipper is inaccurate in manual positioning in the bonding process, the zipper can be bonded and deviated, 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 polishing and bonding system for the zipper of the calf skin of the dummy, which aims to solve the problems that the workload of manually polishing the calf skin of the dummy is large, the efficiency is low, the product quality is difficult to guarantee, the product consistency is poor and the like in the polishing and bonding process of the calf skin of the dummy during automobile collision at the present stage. In other words, the polishing and bonding system and method for the dummy shank skin zipper provided by the embodiment of the invention can improve the polishing and bonding quality of the shank skin and the problem of poor product consistency, improve the working efficiency, obtain the automobile collision dummy shank skin zipper with good smoothness 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 zipper of the skin of the lower leg of the dummy, which comprises: the device comprises a double-optical-axis ball screw device, a grinding device, a crus 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 lower leg of the dummy to be treated under the driving of the double-optical-axis ball screw device; the shank skin fixing device is used for fixing a shank skin piece of the dummy to be treated; the pressing device is used for pressing a connecting area between the glued artificial calf skin zipper and the skin so as to enable the artificial calf skin zipper to be adhered to the skin, wherein after the connecting area between the artificial calf skin zipper and the skin is polished, glue is applied to the connecting area.
Alternatively, referring to the schematic structural diagrams of the polishing and bonding system for the skin zipper of the lower leg of the dummy as shown in fig. 3, 4 and 5, the supporting device comprises: the support comprises 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 device comprises a first double-optical-axis ball screw device optical axis 6, a second double-optical-axis ball screw device optical axis 7, a double-optical-axis ball screw device screw 8, a first double-optical-axis ball screw device lug 9, a second double-optical-axis ball screw device lug 10 and a stepping motor 39. The grinding device includes: the polishing device comprises a polishing device base 11, a polishing head 12, a polishing head base clamping pin 13, a polishing head clamping groove pin shaft 14, a polishing head front end roller 15 and a polishing head front end roller pin shaft 16.
Wherein, step motor 39 drives two optical axis ball screw device lead screw 8 through the shaft coupling and carries out corotation and reversal, and two optical axis ball screw device first auricles 9 are connected with grinding device base 11, drive grinding device through the removal of two optical axis ball screw device first auricles 9 and remove.
The pressing device comprises: the device comprises a pressing device base 17, a pressing device pressing head 18, a pressing device clamping groove pin shaft 19 and a pressing head front end roller 20;
the shank skin fixing device comprises a first base plate transverse groove clamping seat 21, a second base plate transverse groove clamping seat 22, a first base plate transverse groove clamping seat connector 23, a second base plate transverse groove clamping seat connector 24, a first base plate longitudinal groove clamping seat 25, a second base plate longitudinal groove clamping seat 26, a first base plate longitudinal groove clamping seat connector 27, a second base plate longitudinal groove clamping seat connector 28, a first base plate longitudinal groove clamping seat flange 29, a second base plate longitudinal groove clamping seat flange 30, a first clamping seat flange fixing bolt 31, a second clamping seat flange fixing bolt 32, a base plate longitudinal groove screw 33, a collision dummy shank leg bone 34, a first collision dummy shank skin clamping plate 35, a second collision dummy shank skin clamping plate 36 and a middle collision dummy shank skin baffle plate 37.
The first clamping seat 21 of the transverse groove, the second clamping seat 22 of the transverse groove of the bottom plate, the first clamping seat connector 23 of the transverse groove of the bottom plate, the second clamping seat connector 24 of the transverse groove of the bottom plate, the first clamping seat 25 of the longitudinal groove of the bottom plate, the second clamping seat 26 of the longitudinal groove of the bottom plate, the first clamping seat connector 27 of the longitudinal groove of the bottom plate and the second clamping seat connector 28 of the longitudinal groove of the bottom plate can be moved and adjusted in a direction perpendicular to the bottom plate 1 and can be adjusted in a sliding manner parallel to the transverse groove of the bottom plate and the longitudinal groove of the bottom plate, the longitudinal groove screw 33 of the bottom plate adopts a structure with the first section and the second section being reverse threads, so that the first clamping seat 25 of the longitudinal groove of the bottom plate and the second clamping seat 26 of the longitudinal groove of the bottom plate are relatively close to or relatively far away from each other through the rotation of the longitudinal groove screw 33 of the bottom plate.
It should be noted that, the power source device (i.e. the dual-optical-axis ball screw device) is a ball screw, which can convert a rotary motion into a linear motion or convert a torque into an axial repeated acting force, and has the characteristics of high precision, reversibility and high efficiency. The ball screw is used as an active 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 passive 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 processed on the screw rod and the nut, the two arcs are combined to form a spiral raceway, and balls are filled in the raceway. When the screw rotates relative to the nut, the balls roll in the helical raceway, forcing the two to move axially in phase. In order to prevent the balls from rolling out of the nut, return guide devices are arranged at two ends of a spiral groove of the nut, so that the balls can return to a closed loop between the screw nuts. Since rolling friction exists between the screw and the nut, sliding friction exists only between the balls, and thus the ball screw assembly has the following advantages: 1. no side gap, high axial rigidity and high reverse positioning precision. The ball screw pair can apply pretightening force to eliminate axial clearance, so that the axial rigidity is high, no idle stroke (dead zone) exists in the reverse direction, and the positioning precision is high. 2. The motion is sensitive, and no crawling occurs at low speed. The starting torque is small because the static and dynamic friction coefficients are small and the difference value between the static and dynamic friction coefficients is small, namely the power required for achieving the same motion result is far lower than that of a sliding screw rod, the motion is sensitive, the starting torque is extremely small because the ball screw rod utilizes the ball motion, the accurate micro-feeding can be guaranteed, and the phenomenon of low-speed crawling in the sliding motion can not occur. 3. A plurality of balls are arranged between a screw shaft and a nut of the ball screw device to perform rolling motion, and compared with sliding friction between common sliding screw components, the ball screw device is small in friction loss, high in transmission efficiency and capable of achieving high-speed feeding motion. 4. The transmission has reversibility, can not be self-locked, has reversibility because of small friction coefficient, can not be self-locked, and can convert the rotary motion into the linear motion and also can convert the linear motion into the rotary motion. Therefore, in some occasions, such as the transmission of vertical movement, a braking device or a reverse rotation preventing device is required to prevent the workbench and the like from automatically descending due to self weight. 5. Because 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, and has the following characteristics: 1. the transmission precision is high. The belt transmission cannot guarantee accurate transmission ratio, and the chain transmission cannot realize constant instantaneous transmission ratio, but the transmission ratio of the involute gear commonly used in modern times is accurate and constant in theory. The device not only has key requirements on precision machinery and instruments, but also is an important condition for lightening the dynamic load and realizing stable transmission under high-speed heavy load. 2. The application range is wide. The power range of gear transmission is extremely wide and can be from 0.001W to 60000kW; the peripheral speed can be very low and can also be as high as 150m/s, and the belt transmission and the chain transmission are difficult to compare. 3. The transmission between any two spatial shafts such as parallel shafts, intersecting shafts, staggered shafts and the like can be realized, which cannot be realized by belt transmission and chain transmission. 4. Reliable operation and long service life. 5. The transmission efficiency is high, generally 0.94-0.99. 6. Manufacturing and installation requirements are high, and thus costs are high. 7. The requirements on environmental conditions are strict, and except for the conditions of few low speed and low precision, the lubricating oil box generally needs to be arranged in a box cover for dust prevention and scale prevention and also needs to pay attention to lubrication. 8. It is not suitable for transmission between two shafts which are far away. 9. The vibration damping and impact resistance are not as good as flexible transmission such as belt transmission.
Further, an embodiment of the present invention further provides a method for polishing and adhering skin of a lower 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 lower leg of the dummy to be processed and the lower leg zipper through a three-dimensional scanner.
And S620, fixing the shank skin of the dummy to be treated by the shank skin fixing device.
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 the biaxial ball screw device according to the outer contour curve, so that the polishing head of the polishing device polishes the connecting area between the skin of the lower leg of the dummy and the lower leg zipper according to the outer contour curve.
And S640, gluing the polished connecting 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 shank skin and the shank zipper of the dummy according to the outline curve, and the shank zipper is adhered to the shank skin of the dummy.
Illustratively, as shown in fig. 7, the obtaining of the outline curve of the connecting area between the skin of the lower leg of the dummy to be treated and the lower leg zipper by the three-dimensional scanner comprises the following steps:
and S710, calibrating the three-dimensional scanner.
And S720, performing surface treatment on the skin of the lower leg.
And S730, capturing three-dimensional data from different angles.
And S740, extracting the point cloud data of the skin of the crus.
And S750, removing noise points, filling holes and smoothing.
And S760, obtaining a three-dimensional model of the skin of the lower leg.
And S770, deriving a calf skin contour curve.
Specifically, firstly, the three-dimensional scanner is calibrated in a calibration mode, the stability of the environment is ensured, the influence of the environment is avoided to the greatest extent, such as the luminous environment, the influence caused by external environmental factors is reduced, the position of the scanning equipment relative to a scanning object is calculated according to a preset mode of the scanner, the instrument is calibrated carefully, then the skin of the lower leg is subjected to surface treatment, and for objects which are glossy or dark in color, a layer of developer is sprayed before the objects are scanned, the three-dimensional scanner is required to be used for scanning the scanning object at different angles, and meanwhile, the direction of the three-dimensional scanner and the placing position of the scanning object are required to be adjusted for better omnibearing scanning. After scanning, later processing work is required, the method mainly comprises two steps, namely point cloud processing is firstly carried out, collected brightness values are corrected, then some miscellaneous points far away from a part main body are manually eliminated, in order to represent more simply and flexibly and to be convenient for topology description, a triangular surface patch which is the minimum unit and is divided in the surface patches of the polygonal mesh is adopted, software is enabled to automatically scan the reference distance of the point cloud, according to the operation, the set of point coordinate data is converted into a polygon, and then redundant surface patches are deleted for smooth processing. After the point cloud data of the skin of the crus is extracted, the steps of removing noise points, filling holes, smoothing and the like are carried out, a three-dimensional model of the skin of the crus is obtained, and a crus skin contour curve is derived.
In summary, the obtaining of the outline curve of the connection region between the skin of the lower leg of the dummy to be treated and the lower leg zipper by the three-dimensional scanner includes: calibrating the three-dimensional scanner;
performing surface treatment on the skin of the lower leg of the dummy to improve the sensitivity of the skin of the lower leg of the dummy to laser; carrying out three-dimensional data acquisition on the skin of the lower leg of the dummy from different angles; extracting point cloud data of the skin of the crus of the dummy based on the collected three-dimensional data; denoising the point cloud data to obtain a three-dimensional model of the skin of the crus of the dummy; and acquiring an outer contour curve of the connecting area based on the three-dimensional model.
Specifically, if the step angle of the stepping motor is B, the pulse equivalent is δ, the screw pitch of the dual spindle ball screw device is K, the number of input pulses per rotation of the screw of the dual spindle ball screw device is P1, and the number of input pulses per rotation of the stepping motor is P2, the following relationship is given:
P1=K/δ，P2=360°/B；
the lead screw transmission ratio i2 of the double-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 polishing head of the polishing device and the movement of the pressing head of the pressing device specifically includes:
taking A (0,0) as an original point, taking the A (0,0) as the positive direction of an X axis towards the left, and taking the A (0,0) as the positive direction of a Y axis towards the down, establishing a plane rectangular coordinate system, wherein a contour curve obtained by three-dimensional scanning of a crus skin piece is an edge to be polished, and the contour curve can be regarded as a set formed by infinite coordinate points, wherein taking B (X1, Y1) as an example, the distance between a polishing head or a pressing head of a polishing device and the X axis when the polishing head or the pressing head of the pressing device is at an initial position is set as Y0, the extending length of the polishing head or the pressing head is set as Y, and the distance of the polishing head or the pressing head moving towards the left relative to the original point is X, so that the following relation formula is provided: x = x1, y = y1-y0. The grinding device base and the top screw rod drive the grinding head to integrally move in the left-right direction through the rotation of the motor, and when the motor driving the screw rod to rotate does uniform-speed rotating motion, the screw rod rotates around the axis of the screw rod at the same angular speed, so that the grinding head is driven to integrally perform uniform-speed linear motion. The extension y of the grinding head varies with the motor running time t by the distance x of the grinding head moving leftward relative to the origin, since x is a function of t, and the corresponding relationship is x = f (t). And if the screw pitch of the top screw is K, the rotating speed of the motor is nr/s, x = f (t) = n × t × K, the telescopic motion of the grinding head is controlled by a gear and a rack, and the rack and the grinding head are connected into a whole.
The technical scheme of the embodiment of the invention adopts a reasonable mechanical structure and a reasonable measuring method, is applied to the processes of polishing the skin of the crus of the dummy and bonding the zipper, can accurately position the skin part of the crus, and can polish the skin of the crus of the dummy by the slow movement of the top double-optical-axis ball screw device and the polishing head moving according to the outline curve of the crus skin.
It is to be understood 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 claims of this application, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural, 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 a … …" does not exclude the presence of additional like elements in a process, method, or apparatus that comprises the element.
It is further noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," "coupled," and the like are to be construed broadly and encompass, for example, both fixed and removable coupling as well as integral coupling; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention.
Claims (9)
1. A method for measuring the smoothness of a zipper on the skin of a lower leg of a dummy is characterized by comprising the following steps:
controlling the motor to rotate at a constant speed so as to drive the push rod to move at a constant speed along the associated curved slot through the motor;
the push rod drives the force measuring rod to move at a constant speed;
the force measuring rod drives the zipper of the skin of the crus of the dummy to be measured to be closed or opened, and the required pulling force value is recorded;
determining the smoothness of the zipper of the skin of the lower leg of the dummy according to the pulling force value;
one end of the push rod is arranged in a manner of being associated 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 zipper of the skin of the lower leg of the dummy, and the contour curve of the curve groove is parallel to the contour curve of the zipper area of the skin of the lower leg of the dummy.
2. The method of claim 1, wherein said determining the skin zipper smoothness of the dummy's calf based on the tension values comprises:
counting the maximum value and the minimum value in the tension values;
determining a difference between the maximum and minimum values;
and determining the smoothness of the zipper of the skin of the lower leg of the dummy according to the maximum value and the difference.
3. The utility model provides a dummy shank skin zip fastener smoothness measuring device which characterized in that includes:
a top bracket (41), a ball bearing (42), a bearing pin (43), a push rod (44), a sleeve (45), a motor (46), a fifth support frame (47), a zipper pin (48), a force measuring rod (49), a push rod pin (50), a motor bracket (52), a sixth support frame (53), a first bottom connecting rod pin (54), a second bottom connecting rod pin (55), a first bottom connecting rod (56), a second bottom connecting rod (57), a bottom bracket (58) and a zipper (59);
the bottom support (58), the fifth support (47), the sixth support (53) and the top support (41) are connected to form a 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 support (58), the bearing pin (43) plays a role in connecting the ball bearing (42) and the push rod (44), the bearing pin (43) moves in a curved groove of the top support (41), the motor (46) rotates at a constant speed to pull the sleeve (45) to drive the push rod (44) to move, a contour curve of the curved groove of the top support (41) is parallel to an 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 support (58) in the moving process;
the dummy lower leg Pi Fujian (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).
4. The utility model provides a dummy shank skin zip fastener bonding system of polishing which characterized in that includes: the device comprises a supporting device, a double-optical-axis ball screw device, a polishing device, a crus skin fixing device and a pressing device;
wherein, the supporting device is used for providing a supporting function for the system;
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 lower leg of the dummy to be treated under the driving of the double-optical-axis ball screw device;
the shank skin fixing device is used for fixing a shank skin piece of the dummy to be treated;
the compressing device is used for compressing a connecting area between the glued artificial shank skin zipper and the skin so as to enable the artificial shank skin zipper to be bonded with the skin, wherein after the connecting area between the artificial shank skin zipper and the skin is polished, glue is applied to the connecting area.
5. The system of claim 4, wherein the dual optic axis ball screw device comprises: the device comprises a double-optical-axis ball screw device first optical axis (6), a double-optical-axis ball screw device second optical axis (7), a double-optical-axis ball screw device screw (8), a double-optical-axis ball screw device first lug (9), a double-optical-axis ball screw device second lug (10) and a stepping motor (39);
the grinding device includes: the polishing device comprises a polishing device base (11), a polishing head (12) of the polishing device, a polishing head base clamping pin (13), a polishing head clamping groove pin shaft (14), a polishing head front end roller (15) and a polishing head front end roller pin shaft (16);
the stepping motor (39) drives the double-optical-axis ball screw device screw (8) to rotate positively and reversely through the coupler, the first lug (9) of the double-optical-axis ball screw device is connected with the grinding device base (11), and the grinding device is driven to move through the movement of the first lug (9) of the double-optical-axis ball screw device.
6. The system of claim 4, wherein the compression device comprises: the device comprises a pressing device base (17), a pressing device pressing head (18), a pressing device clamping groove pin shaft (19) and a pressing head front end roller (20);
the support device includes: the device comprises 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 shank skin fixing device comprises a first base plate transverse groove clamping seat (21), a second base plate transverse groove clamping seat (22), a first base plate transverse groove clamping seat connector (23), a second base plate transverse groove clamping seat connector (24), a first base plate longitudinal groove clamping seat (25), a second base plate longitudinal groove clamping seat (26), a first base plate longitudinal groove clamping seat connector (27), a second base plate longitudinal groove clamping seat connector (28), a first base plate longitudinal groove clamping seat flange (29), a second base plate longitudinal groove clamping seat flange (30), a first clamping seat flange fixing bolt (31), a second clamping seat flange fixing bolt (32), a base plate longitudinal groove screw (33), a collision dummy shank bone (34), a first collision dummy shank skin clamping plate (35), a second collision dummy shank skin clamping plate (36) and a collision dummy shank skin intermediate baffle (37);
the base plate longitudinal groove screw rod (33) adopts a structure that the front half section and the rear half section are reverse threads, so that the first base plate (25) of the base plate longitudinal groove and the second base plate longitudinal groove (26) are relatively close to or relatively far away from each other through the rotation of the base plate longitudinal groove screw rod (33) per se.
7. A method for polishing and adhering the skin of the lower leg of a dummy, which is applied to the system of any one of claims 4 to 6, and is characterized by comprising the following steps:
acquiring an outer contour curve of a connecting area between the skin of the crus of the dummy to be treated and the crus zipper through a three-dimensional scanner;
fixing the crus skin of the dummy to be treated by the crus skin fixing device;
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 connecting area between the shank skin and the shank zipper of the dummy according to the outer contour curve;
gluing the polished connecting area;
the moving track of the pressing head of the pressing device is controlled through the double-optical-axis ball screw device, so that the pressing head of the pressing device presses the shank skin and the shank zipper of the dummy according to the outline curve, and the shank zipper is bonded on the shank skin of the dummy.
8. The method according to claim 7, wherein the step of acquiring the outer contour curve of the connecting area between the skin of the lower leg of the dummy to be treated and the lower leg zipper through a three-dimensional scanner comprises the following steps:
calibrating the three-dimensional scanner;
performing surface treatment on the skin of the lower leg of the dummy to improve the sensitivity of the skin of the lower leg of the dummy to laser;
carrying out three-dimensional data acquisition on the skin of the lower leg of the dummy from different angles;
extracting point cloud data of the skin of the crus of the dummy based on the collected three-dimensional data;
denoising the point cloud data to obtain a three-dimensional model of the skin of the crus of the dummy;
and acquiring an outer contour curve of the connecting area based on the three-dimensional model.
9. The method of claim 7, wherein if the step angle of the stepping motor is B, the pulse equivalent is δ, the pitch of the lead screw of the dual optical axis ball screw device is K, the number of input pulses per rotation of the lead screw of the dual optical axis ball screw device is P1, and the number of input pulses per rotation of the stepping motor is P2, the following relationship is satisfied:
P1=K/δ，P2=360°/B；
the lead screw transmission ratio i2 of the double-optical-axis ball screw device is as follows: i2=360 × δ/K × B.
Priority Applications (2)
| 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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| 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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| 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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| CN114753063A (en) * | 2022-04-22 | 2022-07-15 | 中汽研汽车检验中心（天津）有限公司 | Automobile collision dummy sewing auxiliary device and control method and use method thereof |
| 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 |
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2022
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- 2022-11-28 CN CN202310143116.XA patent/CN116000747A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0011165A1 (en) * | 1978-11-15 | 1980-05-28 | Scovill Inc. | Apparatus for gapping slide fastener chain |
| CN102495069A (en) * | 2011-12-07 | 2012-06-13 | 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 |
| CN114000270A (en) * | 2020-07-28 | 2022-02-01 | Ykk株式会社 | Material clamping system for edge sewing device of covering cloth 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 |
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| CN115541493B (en) | 2023-04-28 |
| CN116000747A (en) | 2023-04-25 |
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