Manikin lower leg skin zipper sanding and bonding system and method

Abstract

The present application relates to the field of automobile dummies, and discloses a dummy calf skin zipper polishing and bonding system and method. The system comprises a supporting device, a double-light-axis ball screw device, a polishing device, a calf skin fixing device and a pressing device. The supporting device is used for providing support for the system. The double-light-axis ball screw device is used for providing a power source for the polishing device. The polishing device is used for polishing the dummy calf skin zipper to be processed under the driving of the double-light-axis ball screw device. The calf skin fixing device is used for fixing the dummy calf skin to be processed. The pressing device is used for pressing the connecting area between the dummy calf skin zipper and the skin after the connecting area is polished, so that the dummy calf skin zipper and the skin are bonded. Glue is applied to the connecting area after the connecting area between the dummy calf skin zipper and the skin is polished. The embodiment realizes accurate bonding of the dummy calf skin zipper.

Description

Technical Field

[0001] This invention relates to the field of automotive dummies, and more particularly to a system and method for grinding and bonding the skin of a dummy's lower leg with a zipper. Background Technology

[0002] With the continuous increase in vehicle ownership and the frequent occurrence of traffic accidents, consumers and automakers are paying increasing attention to vehicle safety performance. The use of crash test dummies can effectively verify vehicle safety. Statistics show that lower limb injuries account for approximately 36% of all injuries in vehicle occupants, making it the most vulnerable part of the body in a frontal collision. Therefore, research on lower limb injuries in crash test dummies is particularly important.

[0003] Therefore, a smooth and stable zipper on the lower leg of a car crash dummy is fundamental to improving the accuracy of car crash test results.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a zipper grinding and bonding system and method for dummy lower leg skin, achieving smooth bonding of the zipper on the dummy lower leg skin. This solves the problems of high workload, low efficiency, difficulty in guaranteeing product quality, and poor product consistency in the current process of grinding and bonding the zipper on the lower leg skin of dummy dummy dummy dummy dummy dummy dummy dummy dummy skin.

[0006] This invention provides a zipper grinding and bonding system for the skin of a dummy's lower leg, comprising:

[0007] Dual-axis ball screw device, grinding device, calf skin fixing device and clamping device;

[0008] The dual-axis ball screw device is used to provide a power source for the grinding device to drive the grinding device to move.

[0009] The grinding device is used to grind the zipper on the dummy's lower leg skin under the drive of the dual optical axis ball screw device.

[0010] The lower leg skin fixation device is used to fix the lower leg skin of the dummy to be treated;

[0011] The clamping device is used to clamp the connection area between the zipper and the skin of the dummy's lower leg after the adhesive has been applied, so as to bond the zipper and the skin of the dummy's lower leg. The adhesive is applied to the connection area after the connection area between the zipper and the skin of the dummy's lower leg has been sanded.

[0012] This invention provides a method for abrading and bonding the skin of a dummy's lower leg, comprising:

[0013] The outer contour curve of the connection area between the dummy's lower leg skin and the lower leg zipper was obtained using a 3D scanner.

[0014] The skin of the dummy's lower leg to be treated is fixed using a lower leg skin fixation device;

[0015] The grinding head of the grinding device is controlled to move to the initial position, and the movement trajectory of the grinding head is controlled by a dual optical axis ball screw device according to the outer contour curve, so that the grinding head of the grinding device grinds the connection area between the dummy's lower leg skin and the lower leg zipper according to the outer contour curve.

[0016] Apply adhesive to the polished connection area;

[0017] The movement trajectory of the pressing head of the pressing device is controlled by a dual-axis ball screw device, so that the pressing head of the pressing device presses the dummy's lower leg skin and the lower leg zipper according to the outer contour curve, so that the lower leg zipper is adhered to the dummy's lower leg skin.

[0018] The embodiments of the present invention have the following technical effects:

[0019] This technology achieves precise and smooth bonding of zippers to the skin of dummy lower legs, ensuring a flat and stable zipper for automotive crash test dummy skin and laying the foundation for improving the accuracy of automotive crash test results. It solves the problems of high workload, low efficiency, difficulty in guaranteeing product quality, and poor product consistency in the current process of grinding and bonding the skin of automotive crash test dummy lower legs. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a flowchart of a method for measuring the smoothness of a zipper on the skin of a dummy's lower leg, provided in an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the structure of a zipper smoothness measuring device for the skin of a dummy's lower leg provided in an embodiment of the present invention;

[0023] Figure 3 , Figure 4 and Figure 5These are schematic diagrams of the zipper grinding and bonding system for the dummy's lower leg skin from different perspectives provided in the embodiments of the present invention.

[0024] Figure 6 This is a flowchart of a method for grinding and bonding the skin of a dummy's lower leg, provided in an embodiment of the present invention;

[0025] Figure 7 This is a flowchart of an embodiment of the present invention, which describes how to obtain the outer contour curve of the connection area between the skin of a dummy's lower leg and the zipper on the lower leg using a 3D scanner.

[0026] Figure 8 This is a schematic diagram illustrating the movement control of the grinding head of the grinding device and the movement control of the clamping head of the clamping device provided in an embodiment of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0028] Figure 1 This is a flowchart illustrating a method for measuring the smoothness of a zipper on the skin of a dummy's lower leg, provided in an embodiment of the present invention. (See also...) Figure 1 The specific method for measuring the smoothness of the zipper on the dummy's lower leg skin includes:

[0029] S110. Control the motor to rotate at a constant speed so that the push rod can move at a constant speed along the associated curved groove via the motor.

[0030] S120, The push rod drives the force measuring rod to move at a constant speed.

[0031] S130. The force measuring rod is used to pull the zipper of the dummy's lower leg skin to be measured open or closed, and the required tension value is recorded.

[0032] S140. Determine the smoothness of the zipper on the dummy's lower leg skin based on the tensile force value.

[0033] Optionally, determining the smoothness of the zipper on the dummy's lower leg skin based on the tensile force value includes:

[0034] Calculate the maximum and minimum values ​​of the tensile force.

[0035] Determine the difference between the maximum and minimum values;

[0036] The smoothness of the zipper on the dummy's lower leg is determined based on the maximum value and the difference.

[0037] For example, if the maximum value is less than a first threshold and the difference is less than a second threshold, then the smoothness of the dummy's lower leg skin is determined to be within the acceptable range, wherein the first threshold is greater than the second threshold.

[0038] By employing automated methods, the smoothness of the zipper on the dummy's lower leg was objectively measured, which improved the measurement accuracy compared to subjective human measurement.

[0039] Optional, see reference as follows Figure 2 The device shown is for measuring the smoothness of a zipper on the skin of a dummy's lower leg, comprising:

[0040] Top bracket 41, ball bearing 42, bearing pin 43, push rod 44, sleeve 45, motor 46, fifth support frame 47, zipper pin 48, force measuring rod 49, push rod pin 50, motor bracket 52, sixth support frame 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.

[0041] The main body of the measuring device is formed by connecting the bottom bracket 58, the fifth support frame 47, the sixth support frame 53, and the top bracket 41. 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 connects the ball bearing 42 and the push rod 44. The bearing pin 43 can move within the curved groove of the top bracket 41. The motor 46 rotates at a constant speed, pulling the sleeve 45 to move the push rod 44. The contour curve of the curved groove of the top bracket 41 is parallel to the outer contour curve of the zipper 59 area on the lower leg skin, so that the push rod 44 remains perpendicular to the bottom bracket 58 during movement. The dummy lower leg 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.

[0042] When measuring the smoothness of the zipper on the dummy's lower leg skin, the motor 46 rotates at a constant speed, pulling the sleeve 45 and moving the push rod 44. The smoothness of the bonded zipper is measured by the force measuring rod 49. The smoothness is determined by whether the peak tension Fmax and peak-to-peak tension Fpp are within the required range, and is used to evaluate the smoothness of the bonded zipper. During measurement, the force measuring rod 49 is kept as parallel as possible to the plane being measured. Since the motor 46 rotates at a constant speed, the push rod 44 also moves at approximately a constant speed. The reading of the force measuring rod 49 is recorded as F. A graph showing the relationship between the force gauge reading F and the time t is obtained. From this graph, the two parameters, the maximum value Fmax and the minimum value Fmin, can be obtained. Let Fpp = Fmax - Fmin. When Fmax < 90N and Fpp < 30N, the bonded zipper under this condition is determined to be a qualified product; otherwise, it is a defective product.

[0043] Specifically, to ensure the correct installation of the dummy's lower leg skin, the connection area between the zipper and the skin needs to be pre-polished. After polishing, adhesive is applied for bonding, serving both positioning and connection purposes, before the zipper is sewn on. Currently, ordinary clamping equipment is insufficient for this type of skin component. Furthermore, the polishing and bonding of these skin components currently relies mainly on manual labor. However, manual polishing suffers from drawbacks such as high workload, low efficiency, difficulty in guaranteeing product quality, and poor product consistency. In the existing dummy lower leg skin zipper bonding process, inaccurate manual positioning causes the zipper to misalign, resulting in uneven sewing paths, an uneven surface, and poor stability after sewing.

[0044] To address the aforementioned problems, this invention also provides a zipper grinding and bonding system for dummy lower leg skin. This system aims to solve the current problems of high workload, low efficiency, difficulty in guaranteeing product quality, and poor product consistency in the current process of grinding and bonding the lower leg skin of automotive crash test dummies. In other words, the zipper grinding and bonding system and method for dummy lower leg skin provided by this invention can improve the quality of lower leg skin grinding and bonding, mitigate the problem of poor product consistency, increase work efficiency, obtain automotive crash test dummy lower leg skin zippers with good flatness and high stability, and improve the accuracy of automotive crash test results.

[0045] Specifically, this invention also provides a zipper grinding and bonding system for dummy lower leg skin, comprising: a dual-axis ball screw device, a grinding device, a lower leg skin fixing device, and a pressing device. The dual-axis ball screw device provides a power source for the grinding device to move it; the grinding device grinds the zipper on the dummy lower leg skin to be treated under the action of the dual-axis ball screw device; the lower leg skin fixing device fixes the dummy lower leg skin to be treated; and the pressing device presses the connection area between the glued zipper and the skin to bond the zipper to the skin, wherein glue is applied to the connection area after the connection area is ground.

[0046] Optional, see reference as follows Figure 3 , Figure 4 and Figure 5 The diagram shows the structure of the zipper grinding and bonding system for the dummy's lower leg skin. The support device includes: a base plate 1, a first support frame 2, a second support frame 3, a third support frame 4, and a fourth support frame 5.

[0047] The dual-axis ball screw device includes: a first optical axis 6, a second optical axis 7, a screw 8, a first lug 9, a second lug 10, and a stepper motor 39. The grinding device includes: a grinding device base 11, a grinding head 12, a grinding head base retaining pin 13, a grinding head retaining pin 14, a grinding head front roller 15, and a grinding head front roller pin 16.

[0048] Among them, the stepper motor 39 drives the screw 8 of the dual-axis ball screw device to rotate forward and reverse through the coupling. The first lug 9 of the dual-axis ball screw device is connected to the base 11 of the grinding device. The movement of the first lug 9 of the dual-axis ball screw device drives the grinding device to move.

[0049] The clamping device includes: a clamping device base 17, a clamping device clamping head 18, a clamping device slot pin 19, and a clamping head front roller 20;

[0050] The lower leg skin fixation device includes a first mounting bracket 21 with a transverse groove in the base plate, a second mounting bracket 22 with a transverse groove in the base plate, a connector 23 with a transverse groove in the base plate, a connector 24 with a transverse groove in the base plate, a first mounting bracket 25 with a longitudinal groove in the base plate, a second mounting bracket 26 with a longitudinal groove in the base plate, a connector 27 with a longitudinal groove in the base plate, a connector 28 with a longitudinal groove in the base plate, a flange 29 with a longitudinal groove in the base plate, a flange 30 with a longitudinal groove in the base plate, a fixing bolt 31 for the first mounting bracket flange, a fixing bolt 32 for the second mounting bracket flange, a screw 33 with a longitudinal groove in the base plate, a leg bone of the impact dummy, a first splint 34 for the skin of the impact dummy's lower leg, a second splint 36 for the skin of the impact dummy's lower leg, and an intermediate baffle 37 for the skin of the impact dummy's lower leg.

[0051] Among them, the first card seat 21 of the transverse groove, the second card seat 22 of the transverse groove of the base plate, the first card seat connector 23 of the transverse groove of the base plate, the second card seat connector 24 of the transverse groove of the base plate, the first card seat 25 of the longitudinal groove of the base plate, the second card seat 26 of the longitudinal groove of the base plate, the first card seat connector 27 of the longitudinal groove of the base plate, and the second card seat connector 28 of the longitudinal groove of the base plate can all be adjusted to move perpendicular to the direction of the base plate 1 and to slide parallel to the transverse groove and the longitudinal groove of the base plate. The screw 33 of the longitudinal groove of the base plate adopts a reverse thread structure in the front half and the rear half, so that the first card seat 25 of the longitudinal groove of the base plate and the second card seat 26 of the longitudinal groove of the base plate are relatively close or relatively far apart by the rotation of the screw 33 of the longitudinal groove of the base plate.

[0052] It should be noted that the power source device (i.e., the dual-axis ball screw device) uses a ball screw, which can convert rotary motion into linear motion or torque into axial reciprocating force, while also possessing the characteristics of high precision, reversibility, and high efficiency. The ball screw acts as the driving element, and the nut, following the rotation angle of the screw, converts the motion into linear motion according to the corresponding lead specification. The driven workpiece can be connected to the nut via the nut seat, thus achieving the corresponding linear motion. Arc-shaped helical grooves are machined on both the screw and the nut; these two arcs together form a helical raceway, into which balls are inserted. When the screw rotates relative to the nut, the balls roll within the helical raceway, forcing them to move axially in sync. To prevent the balls from rolling out of the nut, return guide devices are provided at both ends of the helical groove of the nut, allowing the balls to return to the screw and nut, forming a closed loop. Because the friction between the screw and the nut is rolling friction, with sliding friction only existing between the balls, the ball screw pair has the following advantages: 1. No backlash, high axial stiffness, and high reverse positioning accuracy. 1. Ball screw pairs can be preloaded to eliminate axial backlash, resulting in high axial stiffness, no dead zone during reversal, and high positioning accuracy. 2. Sensitive movement and no crawling at low speeds. Due to the small static and dynamic friction coefficients and their small difference, the starting torque is low, meaning the power required to achieve the same motion result is far less than that of a sliding screw. This results in sensitive movement because the ball screw utilizes ball motion, leading to extremely low starting torque and ensuring precise micro-feeding without the low-speed crawling phenomenon seen in sliding motion. 3. The ball screw assembly has numerous rolling balls between the screw shaft and nut, resulting in less friction loss and higher transmission efficiency compared to the sliding friction between components in a typical sliding screw, enabling high-speed feed motion. 4. The transmission is reversible and non-self-locking. Due to the low friction coefficient, it cannot self-lock, making the transmission reversible. This means it can convert both rotary and linear motion. Therefore, in certain situations, such as when transmitting vertical motion, it is necessary to add a braking device or an anti-reverse device to prevent the worktable or other components from automatically descending due to their own weight. 5. Because the friction between ball screw components is mainly rolling friction, its friction loss is small, its service life is long, it is simple to use, and its daily maintenance cost is low.

[0053] Gear drives are chosen for implementation because they have the following advantages: 1. High transmission accuracy. Belt drives cannot guarantee an accurate transmission ratio, and chain drives cannot achieve a constant instantaneous transmission ratio. However, the transmission ratio of commonly used involute gears is theoretically accurate and constant. This is not only a key requirement for precision machinery and instruments, but also an important condition for reducing dynamic loads and achieving smooth transmission under high speed and heavy loads. 2. Wide applicability. Gear drives can transmit a very wide range of power, from 0.001W to 60000kW; the circumferential speed can be very low or as high as 150m / s, which is difficult for belt drives and chain drives to match. 3. It can realize transmission between any two axes in space, such as parallel axes, intersecting axes, and staggered axes, which is also impossible for belt drives and chain drives. 4. Reliable operation and long service life. 5. High transmission efficiency, generally 0.94 to 0.99. 6. Higher manufacturing and installation requirements, resulting in higher costs. 7. It has strict requirements for environmental conditions. Except for a few low-speed, low-precision applications, it generally needs to be housed in a protective enclosure to prevent dust and dirt buildup, and lubrication is also important. 8. It is not suitable for transmissions between two shafts that are far apart. 9. Its vibration damping and impact resistance are not as good as flexible transmissions such as belt drives.

[0054] Furthermore, embodiments of the present invention also provide a method for grinding and bonding the skin of a dummy's lower leg, applied to the aforementioned system, such as... Figure 6 As shown, the method includes:

[0055] S610. Obtain the outer contour curve of the connection area between the dummy's lower leg skin and the lower leg zipper using a 3D scanner.

[0056] S620, The skin of the dummy's lower leg to be treated is fixed by a lower leg skin fixation device.

[0057] S630. Control the grinding head of the grinding device to move to the initial position, and control the movement trajectory of the grinding head of the grinding device according to the outer contour curve through the dual optical axis ball screw device, so that the grinding head of the grinding device grinds the connection area between the dummy's lower leg skin and the lower leg zipper according to the outer contour curve.

[0058] S640. Apply adhesive to the sanded connection area.

[0059] S650. The movement trajectory of the pressing head of the pressing device is controlled by the dual optical axis ball screw device so that the pressing head of the pressing device presses the dummy's lower leg skin and the lower leg zipper according to the outer contour curve so that the lower leg zipper is adhered to the dummy's lower leg skin.

[0060] For example, such as Figure 7 As shown, the step of obtaining the outer contour curve of the connection area between the dummy's lower leg skin and the zipper on the lower leg using a 3D scanner includes the following steps:

[0061] S710, calibration and alignment of 3D scanner.

[0062] S720. Surface treatment of the skin on the lower leg.

[0063] S730 captures 3D data from different angles.

[0064] S740, Extract point cloud data of calf skin.

[0065] S750 performs noise removal, hole filling, and smoothing processes.

[0066] S760, obtain a 3D model of the skin on the lower leg.

[0067] S770, Export the contour curve of the calf skin.

[0068] Specifically, the 3D scanner is first calibrated to ensure environmental stability and minimize environmental influences, such as lighting conditions. The position of the scanning device relative to the object is calculated based on the scanner's pre-set mode, and the instrument is carefully calibrated. Then, the skin on the lower leg is treated. For objects with a glossy or dark color, a developer is sprayed on before scanning. The 3D scanner is used to scan the object from different angles. Simultaneously, to achieve a more comprehensive scan, the scanner's orientation and the object's placement need to be adjusted. After scanning, post-processing is required, mainly in two steps: first, point cloud processing, correcting the acquired brightness values; and second, manually eliminating noise points far from the main part. For simpler, more flexible representation and convenient topological description, triangular faces—the smallest unit divided within a polygonal mesh—are used. The software automatically scans the reference distance of the point cloud. Following the above operations, the set of point coordinate data is transformed into polygons. Then, redundant faces are deleted, and smoothing is performed. After extracting the point cloud data of the calf skin, steps such as noise removal, hole filling, and smoothing are performed to obtain a 3D model of the calf skin and export the calf skin contour curve.

[0069] In general, the process of acquiring the outer contour curve of the connection area between the dummy's lower leg skin and the zipper using a 3D scanner includes: calibrating the 3D scanner; performing surface treatment on the dummy's lower leg skin to improve its sensitivity to laser; acquiring 3D data from different angles of the dummy's lower leg skin; extracting point cloud data of the dummy's lower leg skin based on the acquired 3D data; denoising the point cloud data to obtain a 3D model of the dummy's lower leg skin; and acquiring the outer contour curve of the connection area based on the 3D model.

[0070] Specifically, if the step angle of the stepper motor is B, the pulse equivalent is δ, the screw pitch of the dual-axis ball screw device is K, the number of input pulses for one revolution of the dual-axis ball screw device is P1, and the number of input pulses for one revolution of the stepper motor is P2, then the following relationship holds:

[0071] P1 = K / δ, P2 = 360° / B;

[0072] The screw transmission ratio i2 of the dual-axis ball screw device is: i2=360*δ / K*B.

[0073] Further reference Figure 8 As shown, the specific process of controlling the movement of the grinding head of the grinding device and the clamping head of the clamping device is as follows:

[0074] With A(0,0) as the origin, the positive X-axis points to the left and the positive Y-axis points downwards, a Cartesian coordinate system is established. The contour curve obtained from the 3D scan of the calf skin sample is the edge to be polished, which can be regarded as a set of infinite coordinate points. Taking point B(x1,y1) as an example, let y0 be the distance between the polishing head or the clamping head of the polishing device and the X-axis in the initial position, y be the extension length of the polishing head or clamping head, and x be the distance the polishing head or clamping head moves to the left relative to the origin. Then the following relationships exist: x = x1, y = y1 - y0. The base of the polishing device and the top lead screw drive the polishing head to move left and right through the rotation of the motor. When the motor driving the lead screw rotates at a constant speed, the lead screw rotates around its own axis at the same angular velocity, thereby driving the polishing head to move in a uniform linear motion. The distance x that the grinding head moves to the left relative to the origin changes with the motor running time t, and the extension length y of the grinding head also changes accordingly. Since x is a function of t, let the corresponding relationship be x = f(t). Let the pitch of the top screw be K and the motor speed be nr / s, then we have x = f(t) = n*t*K. The extension and retraction motion of the grinding head is controlled by a gear and rack, and the rack and grinding head are connected as a whole.

[0075] The technical solution of this invention adopts a reasonable mechanical structure and measurement method, which is applied to the process of grinding and bonding the skin of the dummy's lower leg. It can accurately position the skin parts of the lower leg, and complete the grinding of the dummy's lower leg skin by the slow movement of the top double optical axis ball screw device and the grinding head moving according to the outer contour curve of the lower leg skin. Through the above measures, manual labor can be replaced, grinding efficiency can be improved, product quality and good consistency can be guaranteed, and a flat and stable zipper for the lower leg skin of the car crash dummy can be obtained, thereby improving the accuracy of the car crash test results.

[0076] It should be noted that the terminology used in this invention is for describing specific embodiments only and is not intended to limit the scope of this application. As shown in the specification and claims, unless the context clearly indicates otherwise, words such as "a," "an," "an," and / or "the" do not specifically refer to the singular and may include the plural. The terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element.

[0077] It should also be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," "linked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of the present invention.

Claims

1. A zipper grinding and bonding system for the skin of a dummy's lower leg, characterized in that, include: Support device, dual optical axis ball screw device, grinding device, lower leg skin fixing device and clamping device; The supporting device is used to provide support for the system; The dual optical axis ball screw device is used to provide a power source for the grinding device to drive the grinding device to move. The grinding device is used to grind the zipper on the dummy's lower leg skin under the drive of the dual optical axis ball screw device. The lower leg skin fixation device is used to fix the lower leg skin of the dummy to be treated; The clamping device is used to clamp the connection area between the zipper and the skin of the dummy's lower leg after the glue has been applied, so that the zipper and the skin of the dummy's lower leg are bonded together. After the connection area between the zipper and the skin of the dummy's lower leg is polished, the glue is applied to the connection area. The clamping device includes: a clamping device base (17), a clamping device clamping head (18), a clamping device slot pin (19), and a clamping head front roller (20). The support device includes: a base plate (1), a first support frame (2), a second support frame (3), a third support frame (4), and a fourth support frame (5); The lower leg skin fixation device includes a first bracket (21) with a transverse groove on the base plate, a second bracket (22) with a transverse groove on the base plate, a connector (23) with a transverse groove on the base plate, a connector (24) with a transverse groove on the base plate, a first bracket (25) with a longitudinal groove on the base plate, a second bracket (26) with a longitudinal groove on the base plate, a connector (27) with a longitudinal groove on the base plate, a connector (28) with a longitudinal groove on the base plate, a flange (29) with a longitudinal groove on the base plate, a flange (30) with a longitudinal groove on the base plate, a fixing bolt (31) for the first bracket flange, a fixing bolt (32) for the second bracket flange, a screw (33) with a longitudinal groove on the base plate, a leg bone of the impact dummy (34), a first splint (35) for the skin of the impact dummy's lower leg, a second splint (36) for the skin of the impact dummy's lower leg, and a middle baffle (37) for the skin of the impact dummy's lower leg. Among them, the first card seat (21) of the transverse groove, the second card seat (22) of the transverse groove of the base plate, the first card seat connector (23) of the transverse groove of the base plate, the second card seat connector (24) of the transverse groove of the base plate, the first card seat (25) of the longitudinal groove of the base plate, the second card seat (26) of the longitudinal groove of the base plate, the first card seat connector (27) of the longitudinal groove of the base plate, and the second card seat connector (28) of the longitudinal groove of the base plate are adjusted to move perpendicular to the direction of the base plate (1) and to slide parallel to the transverse groove and the longitudinal groove of the base plate. The screw (33) of the longitudinal groove of the base plate adopts a reverse thread structure in the front half and the rear half, so that the first card seat (25) of the longitudinal groove of the base plate and the second card seat (26) of the longitudinal groove of the base plate are relatively close or relatively far away through the rotation of the screw (33) of the longitudinal groove of the base plate. A device for measuring the smoothness of a zipper on the skin of a dummy's lower leg, comprising: Top bracket (41), ball bearing (42), bearing pin (43), push rod (44), sleeve (45), motor (46), fifth support frame (47), zipper pin (48), force measuring rod (49), push rod pin (50), motor bracket (52), sixth support frame (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).

2. The system according to claim 1, characterized in that, The dual-axis ball screw device includes: a first optical axis (6), a second optical axis (7), a screw (8), a first lug (9), a second lug (10), and a stepper motor (39). The grinding device includes: a grinding device base (11), a grinding device grinding head (12), a grinding head base locking pin (13), a grinding head slot pin (14), a grinding head front roller (15), and a grinding head front roller pin (16). Among them, the stepper motor (39) drives the screw (8) of the double optical axis ball screw device to rotate forward and reverse through the coupling. The first ear plate (9) of the double optical axis ball screw device is connected to the base (11) of the grinding device. The movement of the first ear plate (9) of the double optical axis ball screw device drives the grinding device to move.

3. A method for grinding and bonding the skin of a dummy's lower leg, applied to the zipper grinding and bonding system for the dummy's lower leg skin as described in any one of claims 1-2, characterized in that, include: The outer contour curve of the connection area between the dummy's lower leg skin and the lower leg zipper was obtained using a 3D scanner. The skin of the dummy's lower leg to be treated is fixed using a lower leg skin fixation device; The grinding head of the grinding device is controlled to move to the initial position, and the movement trajectory of the grinding head is controlled by a dual optical axis ball screw device according to the outer contour curve, so that the grinding head of the grinding device grinds the connection area between the dummy's lower leg skin and the lower leg zipper according to the outer contour curve. Apply adhesive to the polished connection area; The movement trajectory of the pressing head of the pressing device is controlled by a dual-axis ball screw device, so that the pressing head of the pressing device presses the dummy's lower leg skin and the lower leg zipper according to the outer contour curve, so that the lower leg zipper is adhered to the dummy's lower leg skin.

4. The method according to claim 3, characterized in that, The step of obtaining the outer contour curve of the connection area between the dummy's lower leg skin and the zipper on the lower leg using a 3D scanner includes: Calibrate and calibrate the 3D scanner; The skin of the dummy's lower leg is subjected to surface treatment to improve its sensitivity to laser. Three-dimensional data were collected from the dummy's lower leg skin from different angles; Point cloud data of the dummy's lower leg skin was extracted based on the collected 3D data; The point cloud data is denoised to obtain a three-dimensional model of the dummy's lower leg skin; The outer contour curve of the connected region is obtained based on the three-dimensional model.

5. The method according to claim 4, characterized in that, If the step angle of the stepper motor is B, the pulse equivalent is δ, the screw pitch of the dual-axis ball screw device is K, the number of input pulses for one revolution of the dual-axis ball screw device is P1, and the number of input pulses for one revolution of the stepper motor is P2, then the following relationship holds: P1=K / δ, P2=360° / B; The screw transmission ratio i2 of the dual-axis ball screw device is: i2=360*δ / K*B.

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