CN210570389U - Wall thickness measuring device for drawn part - Google Patents
Wall thickness measuring device for drawn part Download PDFInfo
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- CN210570389U CN210570389U CN201922023723.4U CN201922023723U CN210570389U CN 210570389 U CN210570389 U CN 210570389U CN 201922023723 U CN201922023723 U CN 201922023723U CN 210570389 U CN210570389 U CN 210570389U
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Abstract
The utility model relates to a wall thickness measuring equipment technical field discloses a deep-drawing spare wall thickness measuring device, including the horizontal beam who is used for placing the workstation of deep-drawing spare and is located deep-drawing spare top, horizontal beam can follow the direction translation that is on a parallel with the workstation mesa, installs the measuring rack through the balladeur train on the horizontal beam, and the balladeur train can be followed horizontal beam length direction and removed, and the measuring rack inner tube is equipped with the slider that can follow measuring rack length direction and slide, installs the wall thickness measurement mechanism who records the wall thickness through following deep-drawing spare wall both sides centre gripping in the slider. The measuring device can measure the wall thickness of straight-wall drawing parts with regular shapes (cylindrical or conical) and non-axisymmetric shapes, the measuring frame, the sliding block and the wall thickness measuring mechanism can flexibly and adaptively adjust according to the wall surface condition of the drawing part, quickly give the thickness variation trend of each part of the side wall of the drawing part, accurately point out the maximum thinning part or the maximum thickening part and the like, and provide relevant references for equipment or processes of the drawing part.
Description
Technical Field
The utility model relates to a wall thickness measuring equipment technical field specifically relates to a deep-drawing spare wall thickness measuring device.
Background
In the process of drawing deformation of a metal plate, due to the influence of factors such as the performance difference of materials, the processing technology and the like, the phenomenon of uneven deformation can be presented, the uneven deformation can not only produce lug making, but also can cause uneven change of the side wall thickness of a drawn part and the phenomenon of upper thickness and lower thickness, and particularly, the bottom of the drawn part can be seriously thinned.
In order to quickly and accurately obtain the thinning condition of the wall area of the drawn part, many domestic and foreign researchers provide methods for measuring the wall thickness, but most of the drawn part wall thickness measuring methods in the prior art can only test straight-tube drawn parts, and only can measure the wall thickness value at a single position at a single time, so that the thickness variation trends at all parts of the side wall of the drawn part are difficult to compare, the maximum thinning part or the maximum thickening part cannot be quickly and accurately found out, and sometimes the drawn part needs to be split, so that the drawn part is damaged.
Disclosure of Invention
The utility model provides a technical problem lie in overcoming prior art's defect, provide a can measure the deep-drawing spare wall thickness measuring device of optional position wall thickness fast accurately.
The purpose of the utility model is realized through the following technical scheme:
the utility model provides a deep-drawing spare wall thickness measuring device, is including the workstation that is used for placing the deep-drawing spare and the horizontal beam that is located deep-drawing spare top, and horizontal beam can be followed the direction translation that is on a parallel with the workstation mesa, installs the measuring rack through the balladeur train on the horizontal beam, and the balladeur train can be followed horizontal beam length direction and removed, and the measuring rack inner tube is equipped with the slider that can follow measuring rack length direction and slide, installs the wall thickness measurement mechanism who measures the wall thickness through following the centre gripping of deep-drawing spare wall both sides in the slider.
Furthermore, the wall thickness measuring mechanism comprises a measuring seat arranged in the sliding block, a fixed measuring arm and a movable measuring arm are arranged on the measuring seat, a linear notch is formed in the measuring seat and used for the movable measuring arm to move so as to be close to or far away from the fixed measuring arm, and measuring balls in contact with the wall surface of the drawing part are arranged at the measuring end parts of the fixed measuring arm and the movable measuring arm.
Furthermore, a driving device for controlling the measuring frame to rotate around the fixed point parallel to the side surface of the horizontal cross beam is arranged in the sliding frame.
Furthermore, the inner cylinder of the measuring frame is polygonal, the periphery of the sliding block is provided with a structure matched with the structure of the inner cylinder of the measuring frame, a motor and a screw rod driven by the motor to rotate are arranged in the inner cylinder of the measuring frame, the center of the sliding block is provided with a threaded hole matched with the screw rod, and the sliding of the sliding block is controlled by the screw rod.
Further, the measuring seat is mounted in the slide block by a thrust bearing.
And an electromagnet device is arranged between the surface of the measuring seat in the sliding block and comprises an inner electromagnet close to the measuring seat and an outer electromagnet close to the wall surface of the sliding block, the rotating directions of coils of the inner electromagnet and the outer electromagnet are opposite, an inner electromagnet circuit is connected with an outer electromagnet circuit in parallel, and the inner electromagnet is attached to the surface of the measuring seat after the circuits are electrified.
Furthermore, a threaded hole is formed in the movable measuring arm, an adjusting screw is screwed into the threaded hole, and a measuring ball on the movable measuring arm is mounted at the end of the adjusting screw.
Further, the workbench is a magnetic workbench.
Furthermore, the device also comprises a rack, wherein the workbench is positioned on the rack, and a motor is arranged in the rack to control the workbench to rotate.
Compared with the prior art, the utility model discloses following beneficial effect has:
1) the measuring device can measure the wall thickness of a regular (cylindrical or conical) drawing part and is also suitable for measuring the wall thickness of a non-axisymmetric straight-wall drawing part, the measuring frame, the sliding block and the wall thickness measuring mechanism can flexibly adjust the adaptability according to the wall condition of the drawing part, and the thickness of each part of the side wall of the drawing part can be accurately measured on the premise of not damaging the drawing part;
2) the wall thickness measuring mechanism is provided with a sensor and the like which can provide related digital signals, and the thickness variation trend of each part of the side wall of the deep-drawing part can be rapidly known by combining with the information processing of a computer, so that the maximum thinning part or the maximum thickening part and the like can be rapidly and accurately found out, and related references are provided for deep-drawing equipment or a process of the deep-drawing part.
Drawings
Fig. 1 is a schematic structural view of a drawn part wall thickness measuring apparatus according to embodiment 1;
FIG. 2 is a cross-sectional view of the measurement mount installed in the slide block;
3 FIG. 3 3 3 is 3 a 3 schematic 3 view 3 of 3 the 3 installation 3 of 3 the 3 electromagnet 3 device 3 between 3 the 3 measuring 3 seat 3 and 3 the 3 slide 3 block 3 ( 3 i.e. 3, 3 view 3 A 3- 3 A 3 in 3 FIG. 3 2 3) 3; 3
FIG. 4 is a schematic view of the wall thickness measuring mechanism mounted on the slide;
FIG. 5 is an enlarged view of the fixed and movable measuring arms of the wall thickness measuring mechanism;
FIG. 6 is a top view of the structure of the movable measuring arm installed in the measuring base;
FIG. 7 is a sectional view of the structure of the movable measuring arm installed in the measuring base at the root thereof;
fig. 8 is a schematic structural view of a measuring apparatus for measuring the wall thickness of a tapered drawn part according to example 3.
Detailed Description
The invention will be further described with reference to specific embodiments, wherein the drawings are designed solely for the purpose of illustration and not as a definition of the limits of the patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
As shown in figure 1, the wall thickness measuring device for the drawn part comprises a workbench 1 for placing a drawn part A and a horizontal beam 2 positioned above the drawn part, wherein the workbench 1 is provided with fixed bridges 3 at two sides of the drawn part for installing the horizontal beam 2, guide rails (not shown) are arranged on the fixed bridges 3 for enabling the horizontal beam 2 to translate along the direction parallel to the workbench surface of the workbench, a measuring frame 5 is arranged on the horizontal beam 2 through a sliding frame 4, the sliding frame 4 can move along the length direction of the horizontal beam 2 (the relative structural design of the horizontal beam translating along the fixed bridges and the sliding frame moving along the beam is the same as the moving structural design of a travelling crane and a crown block in the prior art), the measuring frame 5 is positioned on the side surface of the horizontal beam 2, the measuring frame 5 is of a long strip-shaped hollow cylindrical structure, a sliding block 6 capable of sliding along the length direction of the measuring frame is arranged in an inner cylinder of the measuring frame 5, and a wall thickness measuring mechanism 8 which.
The wall thickness measuring device of the drawing part also comprises a frame 7, a fixed bridge 3 is arranged on the frame 7, the workbench 1 is arranged at the center of the frame 7, and a motor is arranged in the frame 7 to control the workbench 1 to rotate; the frame 7 is in threaded fit with the workbench 1, and the distance between the wall thickness measuring mechanism and the drawing part can be adjusted by rotating the workbench 1; the workstation design is magnetic work platform to firmly fix the deep-drawing spare to the workstation on, effectively prevent its slip position of shifting (deep-drawing spare material is ferromagnetic material under general condition, if the deep-drawing spare material is non-ferromagnetic material such as aluminium, copper, then can place a little iron plate in deep-drawing spare and assist its magnetism to inhale fixedly).
On the whole, the horizontal beam 2 can move in the length direction (indicated by the X-axis direction) of the fixed bridge frame 3, the sliding frame 4 can move in the length direction (indicated by the Y-axis direction) of the horizontal beam 2, and the workbench 1 can drive the drawing piece to move in the vertical direction (indicated by the Z-axis direction). The motor in the frame 7 drives the workbench 1 and the drawing piece to rotate, and the wall thicknesses of the plate materials of the axisymmetric drawing piece in different directions are quickly measured.
In order to improve the applicability of the present drawing member wall thickness measuring apparatus, a driving apparatus (not shown) for controlling the measuring stand to rotate around a fixed point parallel to the side surface of the horizontal beam may be further provided in the carriage 4 so that the wall thickness measuring apparatus can measure the wall thickness of a curved surface type drawing member (for example, a straight wall type drawing member of a non-axisymmetric type). The driving device is a small motor which can drive the measuring frame to rotate under the control of a computer program so as to adapt to the actual structure of the drawing part.
The inner cylinder of the measuring frame 5 is polygonal, the periphery of the sliding block 6 is provided with a structure matched with the structure of the inner cylinder of the measuring frame 5, specifically, as shown in fig. 4, the sliding block 6 comprises a cylindrical section 61 and a polygonal section 62 connected to the end part of the cylindrical section, the periphery of the polygonal section 62 is matched with the inner cylinder of the measuring frame 5, a motor and a screw driven by the motor to rotate are arranged in the inner cylinder of the measuring frame 5 (the motor and the screw are not shown), the screw is connected with the inner cylinder of the sliding frame through a rolling bearing, a threaded hole matched with the screw is formed in the center of the sliding block, the screw is rotated in the threaded hole of the sliding block when the motor drives the screw to rotate, the sliding block cannot rotate due to the limitation of the polygonal section, and is forced to slide in the inner cylinder of the measuring frame, the sliding block 6.
The wall thickness measuring mechanism 8 comprises a measuring seat 81 arranged in the sliding block 6 (the measuring seat is arranged at the end part far away from the polygonal section in the cylindrical section of the sliding block), and as shown in fig. 2, the measuring seat is arranged in the sliding block 6 through a thrust bearing 82, so that the measuring seat can freely rotate to measure the wall thickness of the sheet material of the non-axisymmetric drawing part in different directions; as shown in fig. 4 and 5, a fixed measuring arm 83 and a movable measuring arm 84 are arranged on the measuring base 81, the fixed measuring arm 83 is fixed on the measuring base 81, a linear notch 811 is formed on the measuring base for the movable measuring arm 84 to move to be close to or far from the fixed measuring arm 83, and measuring balls 85 contacting with the wall surface of the drawing part are mounted at the measuring ends of the fixed measuring arm 83 and the movable measuring arm 84.
As shown in fig. 6 and 7, grooves 812 are further formed on two sides of the linear notch 811 in the thickness direction of the measuring seat 81, a fixture block 841 adapted to the grooves on the two sides is further arranged at an end portion of the movable measuring arm 84 inserted into the linear notch, the end portion of the movable measuring arm 84 and an end portion of the linear notch 811 far away from the fixed measuring arm are connected through a spring 86, the free length of the spring 86 is greater than the length of the linear notch (that is, the spring is in a compressed state), and the spring 86 is arranged in parallel with the linear notch 811. The fixed measuring arm and the movable measuring arm clamp the wall surface from two sides of the wall thickness, when the wall thickness changes, the movable measuring arm moves along the linear notch, the clamping blocks on the two sides can ensure that the movable measuring arm keeps a state perpendicular to the measuring seat in real time, and the spring can ensure that the movable measuring arm flexibly moves according to the change of the wall thickness and is always attached to the side wall of the drawing part.
In order to make the wall thickness measuring device of the present embodiment also capable of measuring a drawn part with a flange, the end of the movable measuring arm 84 extending out of the measuring base 81 is further provided with a threaded hole, an adjusting screw 842 is screwed into the threaded hole, and a measuring ball on the movable measuring arm is mounted at the end of the adjusting screw. In measuring a flanged drawn part, the operator can manually rotate the adjustment screw 842 to variably move the position of the measurement ball 85 on the measurement arm (the distance of the measurement ball from the zero position is determined by the number of turns of the adjustment screw) so that the measurement ball can bypass the flange and measure the wall thickness of the drawn part below the flange.
The wall thickness measuring mechanism of this embodiment adopts the similar structure of electronic slide caliper to measure the distance between fixed measuring arm and the removal measuring arm, namely fixes the main grid on measuring the seat, and the vice grid is fixed on removing the measuring arm, and when there is relative displacement to produce between main grid and the vice grid, the displacement volume will be converted into digital quantity signal transmission to the computer, and the computer will be according to measuring the ball and the automatic wall thickness change curve graph that generates of distance of zero point position, "main grid" and "vice grid" of this embodiment are displacement sensor.
It is mentioned above that the measuring seat 81 can rotate freely in the slide block 6 to measure the wall thickness of the sheet material in different directions of the non-axisymmetric drawing piece, but when measuring the wall thickness of the sheet material in different directions of the axisymmetric drawing piece, it is generally necessary to control the measuring seat 81 not to rotate, in this embodiment, the rotation of the measuring seat is limited by arranging an electromagnet device between the surface of the measuring seat 81 in the slide block and the slide block 6, as shown in fig. 3, the electromagnet device comprises an inner electromagnet 91 close to the measuring seat and an outer electromagnet 92 close to the wall surface of the slide block, the coil rotation directions of the inner electromagnet and the outer electromagnet are opposite, the inner electromagnet circuit is connected in parallel with the outer electromagnet circuit, and the inner electromagnet 91 is attached to the surface of the measuring seat 81 after the circuit is. When the electromagnet circuit is energized, because the coil rotating directions of the inner electromagnet and the outer electromagnet are opposite, a repulsive force is generated between the inner electromagnet and the outer electromagnet, so that the inner electromagnet 91 is forced to press the measuring seat 81 to be incapable of rotating.
The wall thickness measuring device of the embodiment has wide application range, can measure the wall thickness of a regular-shaped (cylindrical or conical) drawing piece, can also measure the wall thickness of a non-axisymmetric straight-wall drawing piece, can flexibly adjust the adaptability of the measuring frame, the sliding block and the wall thickness measuring mechanism according to the wall surface condition of the drawing piece, and can accurately measure the thickness of each part of the side wall of the drawing piece on the premise of not damaging the drawing piece; in addition, a sensor and the like capable of providing related digital signals are arranged on the wall thickness measuring mechanism, and the thickness variation trend of each position of the side wall of the deep-drawing part can be rapidly known by combining with computer information processing, so that the maximum thinning position or the maximum thickening position and the like can be rapidly and accurately found out, and related references are provided for deep-drawing equipment or a process of the deep-drawing part.
Example 2
The present embodiment provides a method for measuring a change in wall thickness of an axially symmetric straight-walled drawn part using the drawn part wall thickness measuring apparatus of embodiment 1, including the steps of:
s1, mounting a three-jaw chuck matched with a magnetic workbench on a rack, fixing a drawing piece at the center of the magnetic workbench by using the three-jaw chuck, electrifying the magnetic workbench to fix the drawing piece on the magnetic workbench, then releasing the fixation of the three-jaw chuck on the drawing piece, taking out the three-jaw chuck, and adjusting the height of the magnetic workbench to keep a proper distance between the drawing piece and a wall thickness measuring mechanism;
s2, starting a wall thickness measuring device, moving a horizontal cross beam to be right above a drawing part, moving a sliding frame to enable a measuring frame to move to be close to the mouth of the drawing part, adjusting the position of a sliding block in the length direction of an inner cylinder of the measuring frame to enable a wall thickness measuring mechanism to clamp the wall surface of the drawing part, and opening an electromagnet device to limit the rotary motion of a measuring seat;
s3, driving a magnetic workbench and the drawing part to rotate through a motor in the machine frame, measuring the wall thicknesses of the plates in different directions, and controlling a sliding block to move in a measuring frame by a computer to enable a wall thickness measuring mechanism to move in the height direction of the drawing part and measure the wall thicknesses of the plates at different heights;
and S4, providing a digital signal of the measured wall thickness to a computer by a displacement sensor on the wall thickness measuring mechanism, and generating a three-dimensional cloud picture of the wall thickness change of the deep-drawing part by the computer according to the digital signal and the structural parameters of the deep-drawing part input in advance.
Example 3
This embodiment provides a method of measuring a wall thickness change of an axisymmetric tapered drawn part using the drawn part wall thickness measuring apparatus of embodiment 1, a test state of the drawn part wall thickness measuring apparatus is shown in fig. 8, and a test procedure includes the steps of:
s1, mounting a three-jaw chuck matched with a magnetic workbench on a rack, fixing a drawing piece at the center of the magnetic workbench by using the three-jaw chuck, electrifying the magnetic workbench to fix the drawing piece on the magnetic workbench, then releasing the fixation of the three-jaw chuck on the drawing piece, taking out the three-jaw chuck, and adjusting the height of the magnetic workbench to keep a proper distance between the drawing piece and a wall thickness measuring mechanism;
s2, starting a motor in the sliding frame, enabling the measuring frame to rotate around a fixed point until an included angle between the measuring frame and a horizontal plane is equal to the taper of the drawing part, starting a wall thickness measuring device, moving a horizontal cross beam to be right above the drawing part, moving the sliding frame to enable the measuring frame to move to be close to the mouth of the drawing part, adjusting the position of a sliding block in the length direction of an inner cylinder of the measuring frame to enable a wall thickness measuring mechanism to clamp the wall surface of the drawing part, and enabling an electromagnet device to be started to limit the rotation motion;
s3, driving a magnetic workbench and the drawing part to rotate through a motor in the machine frame, measuring the wall thicknesses of the plates in different directions, and controlling a sliding block to move in a measuring frame by a computer to enable a wall thickness measuring mechanism to move in the height direction of the drawing part and measure the wall thicknesses of the plates at different heights;
and S4, providing a digital signal of the measured wall thickness to a computer by a displacement sensor on the wall thickness measuring mechanism, and generating a three-dimensional cloud picture of the wall thickness change of the deep-drawing part by the computer according to the digital signal and the structural parameters of the deep-drawing part input in advance.
Example 4
The present embodiment provides a method for measuring a change in wall thickness of a non-axisymmetric straight-wall type drawn part by using the drawn part wall thickness measuring apparatus of embodiment 1, including the steps of:
s1, placing a drawing piece on a magnetic workbench, electrifying the magnetic workbench to fix the drawing piece, and adjusting the height of the magnetic workbench to keep the drawing piece at a proper distance from a wall thickness measuring mechanism;
s2, starting a wall thickness measuring device, moving a horizontal cross beam to be right above the drawing part, moving a sliding frame to enable a measuring frame to move to be close to the mouth part of the drawing part, adjusting the position of a sliding block in the length direction of an inner cylinder of the measuring frame to enable a wall thickness measuring mechanism to clamp the wall surface of the drawing part, and measuring the wall thickness of the position;
s3, according to the initial measuring point position and the shape of the drawing part, the horizontal beam and the sliding frame are controlled to move through a program, and the measuring seat can freely rotate in the sliding block, so that the connecting line direction of the fixed measuring arm and the movable measuring arm is always perpendicular to the side wall of the drawing part, and the measurement of the wall thickness of the plate in different directions is realized; meanwhile, the wall thickness measuring mechanism moves in the height direction of the drawing part through the movement of the sliding block in the measuring frame, so that the wall thicknesses of the plates with different heights are measured;
and S4, providing a digital signal of the measured wall thickness to a computer by a displacement sensor on the wall thickness measuring mechanism, and generating a three-dimensional cloud picture of the wall thickness change of the deep-drawing part by the computer according to the digital signal and the structural parameters of the deep-drawing part input in advance.
It should be understood that the above-mentioned embodiments are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. The utility model provides a deep-drawing spare wall thickness measuring device, its characterized in that, including the workstation that is used for placing the deep-drawing spare and the horizontal beam that is located deep-drawing spare top, horizontal beam can be along the direction translation that is on a parallel with the workstation mesa, installs the measuring rack through the balladeur train on the horizontal beam, the balladeur train can be followed horizontal beam length direction and removed, the measuring rack inner tube is equipped with the slider that can follow measuring rack length direction and slide, the wall thickness measurement mechanism who measures the wall thickness through centre gripping from deep-drawing spare wall both sides is installed in the slider.
2. A wall thickness measuring apparatus for a drawn part according to claim 1, wherein the wall thickness measuring means comprises a measuring seat mounted in the slide block, the measuring seat having a fixed measuring arm and a movable measuring arm, the measuring seat having a linear notch for the movable measuring arm to move closer to or away from the fixed measuring arm, the measuring ends of the fixed measuring arm and the movable measuring arm each having a measuring ball mounted thereon for contact with the wall of the drawn part.
3. A deep-drawing part wall thickness measuring apparatus according to claim 1, wherein the carriage is provided with drive means for controlling the rotation of the measuring stand about a fixed point parallel to the side of the horizontal beam.
4. The wall thickness measuring device of a drawing part according to claim 1, wherein the measuring frame inner cylinder is polygonal, the periphery of the slide block is provided with a structure matched with the structure of the measuring frame inner cylinder, the measuring frame inner cylinder is internally provided with a motor and a screw rod driven by the motor to rotate, the center of the slide block is provided with a threaded hole matched with the screw rod, and the slide block is controlled by the screw rod to slide.
5. A drawing member wall thickness measuring apparatus according to claim 2, wherein the measuring block is mounted within the slide by a thrust bearing.
6. A wall thickness measuring device for a drawn part according to claim 5, wherein the measuring seat is provided with electromagnet means between the surface of the measuring seat in the slide and the slide, the electromagnet means comprising an inner electromagnet adjacent to the measuring seat and an outer electromagnet adjacent to the wall of the slide, the coils of the inner electromagnet and the outer electromagnet being rotated in opposite directions, the inner electromagnet circuit being connected in parallel with the outer electromagnet circuit, the inner electromagnet being adapted to the surface of the measuring seat after the inner electromagnet circuit is energized.
7. The apparatus for measuring wall thickness of drawn part according to claim 2, wherein the movable measuring arm is provided with a threaded hole, an adjusting screw is screwed into the threaded hole, and a measuring ball on the movable measuring arm is mounted on an end of the adjusting screw.
8. A drawing member wall thickness measuring apparatus according to claim 1, wherein the table is a magnetic table.
9. The apparatus of claim 8 further comprising a frame, the table being located on the frame, the frame having a motor therein for controlling the rotation of the table.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922023723.4U CN210570389U (en) | 2019-11-21 | 2019-11-21 | Wall thickness measuring device for drawn part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922023723.4U CN210570389U (en) | 2019-11-21 | 2019-11-21 | Wall thickness measuring device for drawn part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210570389U true CN210570389U (en) | 2020-05-19 |
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ID=70637079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922023723.4U Expired - Fee Related CN210570389U (en) | 2019-11-21 | 2019-11-21 | Wall thickness measuring device for drawn part |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210570389U (en) |
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2019
- 2019-11-21 CN CN201922023723.4U patent/CN210570389U/en not_active Expired - Fee Related
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