CN210025545U - FPC board drilling machine - Google Patents
FPC board drilling machine Download PDFInfo
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- CN210025545U CN210025545U CN201920581668.8U CN201920581668U CN210025545U CN 210025545 U CN210025545 U CN 210025545U CN 201920581668 U CN201920581668 U CN 201920581668U CN 210025545 U CN210025545 U CN 210025545U
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Abstract
The utility model relates to a field, in particular to drilling machine of FPC board, its technical scheme main points are: the device comprises a rack, wherein a material bearing plate with a reserved hole position is arranged on the rack, a feeding device for hoisting an FPC (flexible printed circuit) board to the material bearing plate, a drilling device for drilling the FPC board, a transmission device for clamping the material bearing plate and driving the material bearing plate to move and a material receiving device for taking the FPC board off the material bearing plate are arranged on the rack; through the common cooperation of feeding device, drilling equipment, transmission device and material collecting device to realize that mechanical full automatization drills to the FPC board, saved manual operation, saved the human cost, improved production preparation efficiency.
Description
Technical Field
The utility model relates to a FPC board preparation field, more specifically say, it relates to a FPC board drilling machine.
Background
The flexible printed circuit board is also called as FPC board, and is a flexible printed circuit board which is made of polyimide or polyester film as a base material and has high reliability and excellent performance; the high-density light-weight LED lamp has the characteristics of high wiring density, light weight, thin thickness and good bending property.
The flexible circuit board need pass through multiple processes in the manufacturing process, and wherein the flexible circuit board need punch, and the current mode of punching adopts semi-automatization's drilling machine usually, needs the manual work to counterpoint the back to the flexible circuit board, and the operation drilling machine drills to the flexible circuit board.
Above-mentioned semi-automatization's drilling machine, only beat a hole on the flexible circuit board more than, need carry out artifical location with the flexible circuit board at every turn, troublesome poeration, and inefficiency, wasted manpower resources simultaneously.
SUMMERY OF THE UTILITY MODEL
According to the not enough of above-mentioned prior art, the utility model provides a FPC board drilling machine, the full automatization operation that has improves production efficiency, reduces the effect of human cost.
The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme:
a drilling machine for FPC boards comprises a rack, wherein a material bearing plate with a reserved hole position is arranged on the rack, and a feeding device, a drilling device, a transmission device and a material receiving device are arranged on the rack, wherein the feeding device is used for hoisting FPC boards to the material bearing plate, the drilling device is used for drilling the FPC boards, the transmission device is used for clamping the material bearing plate and driving the material bearing plate to move, and the material receiving device is used for taking the FPC boards off the material bearing plate;
the feeding device comprises a first screw rod arranged on the rack and a clamping assembly of which the top is fixed on the first screw rod; a first air cylinder is arranged between the clamping assembly and the rack and used for controlling the clamping assembly to lift up and down;
the conveying device comprises a second screw rod and a conveying table, the second screw rod is perpendicular to the first screw rod in the horizontal direction, the conveying table is slidably mounted on the second screw rod, the conveying table comprises a conveying plate slidably mounted on the second screw rod, a first air cylinder clamping jaw fixedly arranged beside the conveying plate and a second air cylinder clamping jaw slidably mounted on the conveying plate, and the first air cylinder clamping jaw and the second air cylinder clamping jaw are respectively clamped at two ends of the material bearing plate;
the drilling device comprises a fourth screw rod arranged on the rack, a drilling frame slidably mounted on the fourth screw rod, a fourth cylinder arranged on the drilling frame and a drilling head mounted on the fourth cylinder, wherein the fourth cylinder is used for driving the drilling head to move up and down to perform drilling operation.
By adopting the technical scheme, the clamping assembly clamps the FPC board, the clamping assembly is driven to move through the first screw rod, the FPC board is conveyed to the material bearing plate, the material bearing plate is clamped and fixed by the first air cylinder clamping jaw and the second air cylinder clamping jaw on the conveying table, and the material bearing plate slides to the drilling assembly along the second screw rod; the drilling frame slides on a fourth screw rod, the material bearing plate is conveyed to a drilling machine device, the drilling frame slides to the position above the material bearing plate through the fourth screw rod, a fourth cylinder controls a drilling head to move up and down to drill the FPC board, meanwhile, the fourth screw rod drives the drilling frame to conduct fine adjustment, the second screw rod drives the material bearing plate to conduct fine adjustment, drilling of different positions of the FPC board is completed, the drilled FPC board is conveyed to a material receiving device through the second screw rod, the material receiving device takes the FPC board off the material bearing plate, and the drilling process of one FPC board is completed; when the material receiving device finishes material receiving, the bearing plate returns to the feeding device through the second lead screw, and the feeding device conveys the next FPC board to the material bearing plate to form a cycle operation; full-automatic operation, whole work need not manual control, has improved production efficiency, has reduced the human cost.
The utility model discloses further set up to, the centre gripping subassembly is including setting firmly the holding frame in the cylinder bottom, the vertical two sets of clamping bars that are equipped with on the holding frame, the clamping bar bottom is equipped with first vacuum chuck, first vacuum chuck adsorbs respectively at FPC board both ends.
Through adopting above-mentioned technical scheme, FPC board hardness is lower, in transportation process, can not receive the friction, consequently sets up first vacuum chuck at the clamping bar tip, and first vacuum chuck tip is soft plastics, and the laminating is on the FPC board, inhales the FPC board, has avoided the FPC board to receive the friction.
The utility model discloses further set up to, wherein a set of be equipped with the fifth cylinder on the clamping bar, the fifth cylinder sets up on the holding frame, and the fifth cylinder is used for shaking one of them a set of clamping bar from top to bottom, and another group's clamping bar sets firmly on the holding frame, the other tight subassembly that supports that is equipped with of centre gripping subassembly.
Through adopting above-mentioned technical scheme, the FPC board has the adhesion when piling together, when first vacuum chuck adsorbs the FPC board, may adsorb two or more FPC boards, the FPC board of below does not have with first vacuum chuck contact, easily take place to drop, or move the position when drilling, cause the FPC board to damage, thereby it is used for shaking the fifth cylinder of clamping bar to set up one here, thereby shake the FPC board through fifth cylinder control clamping bar up-and-down motion, guarantee that first vacuum chuck adsorbs only a FPC board at every turn, the FPC board spoilage has been reduced.
The utility model discloses further set up to, support tight subassembly including setting up the tight piece of supporting by the centre gripping subassembly, support tight piece setting in the frame, support to be equipped with the sixth lead screw between tight piece and the frame and be connected, support tight piece threaded connection on the sixth lead screw, support tight piece fixed mounting on the sixth cylinder.
Through adopting above-mentioned technical scheme, support tight subassembly and be used for fixing the FPC board of below after the clamping bar shakes, after fifth cylinder control clamping bar shakes, when the clamping bar has not taken out the FPC board that adsorbs from the board heap yet, the tight piece of sixth lead screw control is supported and is removed to the board heap top, the tight piece of sixth cylinder control is supported and is pushed down and fix the board heap, then first cylinder just controls the clamping bar and rises the FPC board that adsorbs, thereby it carries the FPC board of adsorption column on the material-bearing plate to control the holding frame motion by first lead screw.
The utility model discloses further set up to, be equipped with the guide rail on the transmission board, second cylinder clamping jaw other end slidable mounting is on the guide rail.
Through adopting above-mentioned technical scheme, the second cylinder clamping jaw can slide on the guide rail to adjust the spacing distance between first cylinder clamping jaw and the second cylinder clamping jaw, be applicable to the different FPC board of processing, improved the practicality of this device.
The utility model discloses further set up to, material collecting device fixes the clamping part on the third lead screw including setting up third lead screw and the top in the frame, is equipped with the third cylinder between clamping part and the frame, and the third cylinder is used for controlling the clamping part oscilaltion.
By adopting the technical scheme, when the FPC board after drilling is conveyed to the receiving device, the third screw rod drives the clamping part to move to the upper side of the FPC board, the third air cylinder controls the clamping part to descend to adsorb the FPC board, then the third air cylinder controls the clamping part to rise, the third screw rod drives the clamping part to leave the material bearing plate, and the processed FPC board is placed aside.
The utility model discloses further set up to, the clamping part is including setting firmly the mounting bracket in the cylinder bottom, the vertical at least one supporting rod that is equipped with on the mounting bracket, the supporting rod bottom is equipped with second vacuum chuck.
Through adopting above-mentioned technical scheme, FPC board hardness is lower, in transportation process, can not receive the friction, consequently sets up second vacuum chuck at the centre gripping rod tip, and second vacuum chuck tip is soft plastics, and the laminating is on the FPC board, inhales the FPC board, has avoided the FPC board to receive the friction.
To sum up, the utility model discloses a beneficial technological effect does:
the FPC board drilling machine comprises a feeding device, a drilling device, a transmission device and a material receiving device, wherein the feeding device clamps an FPC board and conveys the FPC board to the transmission device, the transmission device conveys the FPC board to the working position of the drilling device, the transmission device conveys the FPC board to the material receiving device after the drilling device punches the FPC board, the material receiving device takes the FPC board off the transmission device, and the FPC board is drilled fully automatically through the common cooperation of the feeding device, the drilling device, the transmission device and the material receiving device, so that manual operation is omitted, labor cost is saved, and production and manufacturing efficiency is improved;
2, the hardness of the FPC board is low, and the FPC board cannot be rubbed in the conveying process, so that a second vacuum sucker is arranged at the end part of the clamping rod, the end part of the second vacuum sucker is made of soft plastic and is attached to the FPC board to suck the FPC board, and the FPC board is prevented from being rubbed;
3 the FPC board has the adhesion when stacking together, when first vacuum chuck adsorbs the FPC board, may adsorb two or more FPC boards, the FPC board of below does not have with first vacuum chuck contact, easily take place to drop, or move the position when drilling, cause the FPC board to damage, thereby it is used for trembling the fifth cylinder of clamping bar to set up one here, thereby it trembles the FPC board to control the clamping bar up-and-down motion through the fifth cylinder, guarantee that first vacuum chuck adsorbs a FPC board only at every turn, FPC board spoilage has been reduced.
Drawings
Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention;
fig. 2 is a schematic front view of an embodiment of the invention;
FIG. 3 is a schematic view of the structure of the feeding device in this embodiment;
FIG. 4 is a schematic structural view of the material receiving device in the present embodiment;
fig. 5 is a schematic structural diagram of the abutting assembly in the embodiment.
Reference numerals: 1. a frame; 2. a material bearing plate; 3. a feeding device; 31. a first lead screw; 32. a clamping assembly; 321. a clamping frame; 322. a clamping bar; 323. a first vacuum chuck; 324. a fifth cylinder; 33. a propping component; 331. a propping block; 332. a sixth cylinder; 34. a first cylinder; 4. a drilling device; 41. a fourth screw rod; 42. drilling a hole frame; 43. a fourth cylinder; 44. drilling a hole head; 5. a transmission device; 51. a second lead screw; 52. a conveying table; 53. a transmission plate; 54. a first cylinder clamp jaw; 55. a second cylinder jaw; 6. a material receiving device; 61. a third screw rod; 62. a clamping portion; 621. a mounting frame; 63. a third cylinder; 7. a guide rail.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and 3, a drilling machine for an FPC board includes a frame 1, a material-holding plate 2 with a reserved hole site is arranged on the frame 1, a feeding device 3 for hoisting the FPC board to the material-holding plate 2 is arranged on the frame 1, the feeding device 3 includes a first screw rod 31 arranged on the frame 1 and a clamping assembly 32 with the top fixed on the first screw rod 31; a first air cylinder 34 is arranged between the clamping assembly 32 and the frame 1, and the first air cylinder 34 is used for controlling the clamping assembly 32 to lift up and down;
as shown in fig. 1, a conveying device 5 is arranged on the frame 1 at one end of the feeding device 3 far away from the clamping assembly 32, the conveying device 5 comprises a second screw rod 51 arranged vertically to the first screw rod 31 in the horizontal direction and a conveying table 52 slidably mounted on the second screw rod 51, the conveying table 52 comprises a conveying plate 53 slidably mounted on the second screw rod 51, a first cylinder 34 clamping jaw fixedly arranged beside the conveying plate 53 and a second cylinder clamping jaw 55 slidably mounted on the conveying plate 53, and the first cylinder 34 clamping jaw and the second cylinder clamping jaw 55 are respectively clamped at two ends of the material bearing plate 2; the transmission plate 53 is provided with a guide rail 7, and the other end of the second cylinder clamping jaw 55 is slidably mounted on the guide rail 7. Second cylinder clamping jaw 55 can slide on guide rail 7 to adjust the spacing distance between first cylinder 34 clamping jaw and the second cylinder clamping jaw 55, be applicable to the different FPC board of processing, improved this device's practicality.
As shown in fig. 1 and 2, the drilling device 4 includes a fourth screw 41 disposed on the frame 1, a drilling frame 42 slidably mounted on the fourth screw 41, a fourth air cylinder 43 disposed on the drilling frame 42, and a drilling head 44 mounted on the fourth air cylinder 43, wherein the fourth air cylinder 43 is used for driving the drilling head 44 to move up and down to perform a drilling operation.
Referring to fig. 1, 2, 3 and 4 to describe the working process of this embodiment, the clamping assembly 32 clamps the FPC board, the first screw 31 drives the clamping assembly 32 to move, the FPC board is conveyed to the material-receiving plate 2, the material-receiving plate 2 is clamped and fixed by the first cylinder 34 clamping jaw and the second cylinder clamping jaw 55 on the conveying table 52, and the material-receiving plate 2 slides to the drilling assembly along the second screw 51; the drilling frame 42 slides on the fourth screw rod 41, the material bearing plate 2 is conveyed to a drilling machine device, the drilling frame 42 slides to the position above the material bearing plate 2 through the fourth screw rod 41, the fourth air cylinder 43 controls the drilling head 44 to move up and down to drill holes on the FPC board, meanwhile, the fourth screw rod 41 drives the drilling frame 42 to carry out fine adjustment, the second screw rod 51 drives the material bearing plate 2 to carry out fine adjustment, different positions of the FPC board are drilled, the drilled FPC board is conveyed to the material receiving device 6 through the second screw rod 51, the material receiving device 6 takes the FPC board off from the material bearing plate 2, and the drilling process of one FPC board is completed; in the process that the drilling machine drills holes until the material receiving device 6 receives the materials, the feeding device 3 also performs feeding operation at the same time, after the material receiving device 6 receives the materials, the bearing plate returns to the feeding device 3 through the second screw rod 51, and the feeding device 3 conveys the next FPC board to the bearing plate 2 to form a cycle operation; the full-automatic operation, whole work need not manual control, has reduced the effect of human cost.
As shown in fig. 3, the clamping assembly 32 includes a clamping frame 321 fixed at the bottom of the cylinder, two sets of clamping rods 322 are vertically arranged on the clamping frame 321, a first vacuum chuck 323 is arranged at the bottom of the clamping rods 322, and the first vacuum chucks 323 are respectively adsorbed at two ends of the FPC board. The FPC board hardness is lower, in transportation process, can not receive the friction, consequently sets up first vacuum chuck 323 at clamping bar 322 tip, and first vacuum chuck 323 tip is soft plastics, and the laminating is on the FPC board, sucks the FPC board, has avoided the FPC board to receive the friction.
One group of clamping rods 322 is provided with a fifth cylinder 324, the fifth cylinder 324 is arranged on the clamping frame 321, the fifth cylinder 324 is used for shaking one group of clamping rods 322 up and down, the other group of clamping rods 322 is fixedly arranged on the clamping frame 321, and a propping assembly 33 is arranged beside the clamping assembly 32. The FPC boards have adhesiveness when being stacked together, when the first vacuum chuck 323 adsorbs the FPC boards, two or more FPC boards can be adsorbed, the FPC boards below are not in contact with the first vacuum chuck 323, the FPC boards are easy to drop, or the FPC boards are damaged due to the fact that the FPC boards are shifted during drilling, a fifth air cylinder 324 used for shaking the clamping rod 322 is arranged at the position, the clamping rod 322 is controlled to move up and down through the fifth air cylinder 324 to shake the FPC boards, the fact that only one FPC board is adsorbed by the first vacuum chuck 323 every time is guaranteed, and the FPC board damage rate is reduced.
As shown in fig. 1 and 5, the tightening assembly 33 includes a tightening block 331 disposed beside the clamping assembly 32, the tightening block 331 is disposed on the frame 1, a sixth screw rod (not shown) is disposed between the tightening block 331 and the frame 1 for connection, the tightening block 331 is screwed on the sixth screw rod, and the tightening block 331 is fixedly mounted on the sixth air cylinder 332. The abutting assembly 33 is used for fixing the FPC board below the clamping rod 322 after shaking, after the fifth cylinder 324 controls the clamping rod 322 to shake, when the clamping rod 322 does not take out the adsorbed FPC board from the board stack, the sixth screw rod controls the abutting block 331 to move to the upper side of the board stack, the sixth cylinder 332 controls the abutting block 331 to press down to fix the board stack, then the first cylinder 34 controls the clamping rod 322 to lift the adsorbed FPC board, and the first screw rod 31 controls the clamping frame 321 to move so as to convey the FPC board of the adsorption column to the material bearing plate 2.
As shown in fig. 1 and 4, the material receiving device 6 includes a third screw 61 arranged on the frame 1 and a clamping portion 62 with the top fixed on the third screw 61, a third air cylinder 63 is arranged between the clamping portion 62 and the frame 1, and the third air cylinder 63 is used for controlling the clamping portion 62 to move up and down. When the FPC board after drilling is conveyed to the material receiving device 6, the third screw rod 61 drives the clamping portion 62 to move to the position above the FPC board, the third air cylinder 63 controls the clamping portion 62 to descend to adsorb the FPC board, then the third air cylinder 63 controls the clamping portion 62 to rise, the third screw rod 61 drives the clamping portion 62 to leave the material bearing plate 2, and the processed FPC board is placed aside.
As shown in fig. 4, the clamping portion 62 includes a mounting frame 621 fixedly disposed at the bottom of the cylinder, at least one clamping rod is vertically disposed on the mounting frame 621, and a second vacuum chuck is disposed at the bottom of the clamping rod. The FPC board hardness is lower, in transportation process, can not receive the friction, consequently sets up second vacuum chuck at the clamping bar tip, and second vacuum chuck tip is soft plastics, and the laminating is on the FPC board, inhales the FPC board, has avoided the FPC board to receive the friction.
The specific implementation method of the embodiment is as follows:
the first screw rod 31 drives the clamping assembly 32 to move, the FPC board is conveyed to the material bearing plate 2, the material bearing plate 2 is clamped and fixed by a first air cylinder 34 clamping jaw and a second air cylinder clamping jaw 55 on the conveying table 52, and the material bearing plate 2 slides to the drilling assembly along the second screw rod 51; the drilling frame 42 slides on the fourth screw rod 41, the material bearing plate 2 is conveyed to a drilling machine device, the drilling frame 42 slides to the position above the material bearing plate 2 through the fourth screw rod 41, the fourth air cylinder 43 controls the drilling head 44 to move up and down to drill holes on the FPC board, meanwhile, the fourth screw rod 41 drives the drilling frame 42 to carry out fine adjustment, the second screw rod 51 drives the material bearing plate 2 to carry out fine adjustment, different positions of the FPC board are drilled, the drilled FPC board is conveyed to the material receiving device 6 through the second screw rod 51, the material receiving device 6 takes the FPC board off from the material bearing plate 2, and the drilling process of one FPC board is completed; in the process that the drilling machine drills until the material receiving device 6 finishes receiving the materials, the feeding device 3 also performs feeding operation at the same time, after the material receiving device 6 finishes receiving the materials, the bearing plate returns to the feeding device 3 through the second screw rod 51, and the feeding device 3 conveys the next FPC board to the material bearing plate 2 to form circulating operation.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (7)
1. The utility model provides a FPC board drilling machine, includes frame (1), be equipped with in frame (1) and reserve material-bearing plate (2) that have the hole site, its characterized in that: the frame (1) is provided with a feeding device (3) for hoisting the FPC board to the material bearing plate (2), a drilling device (4) for drilling the FPC board, a transmission device (5) for clamping the material bearing plate (2) and driving the material bearing plate (2) to move, and a material receiving device (6) for taking the FPC board off the material bearing plate (2);
the feeding device (3) comprises a first screw rod (31) arranged on the rack (1) and a clamping assembly (32) with the top fixed on the first screw rod (31); a first air cylinder (34) is arranged between the clamping assembly (32) and the rack (1), and the first air cylinder (34) is used for controlling the clamping assembly (32) to lift up and down;
the conveying device (5) comprises a second screw rod (51) and a conveying table (52), wherein the second screw rod (51) is perpendicular to the first screw rod (31) in the horizontal direction, the conveying table (52) is slidably mounted on the second screw rod (51), the conveying table (52) comprises a conveying plate (53) slidably mounted on the second screw rod (51), a first cylinder clamping jaw (34) fixedly arranged beside the conveying plate (53) and a second cylinder clamping jaw (55) slidably mounted on the conveying plate (53), and the first cylinder clamping jaw (34) and the second cylinder clamping jaw (55) are respectively clamped at two ends of the material bearing plate (2);
the drilling device (4) comprises a fourth screw rod (41) arranged on the rack (1), a drilling frame (42) slidably mounted on the fourth screw rod (41), a fourth air cylinder (43) arranged on the drilling frame (42) and a drilling head (44) mounted on the fourth air cylinder (43), wherein the fourth air cylinder (43) is used for driving the drilling head (44) to move up and down to perform drilling operation.
2. The FPC board drilling machine according to claim 1, characterized in that: centre gripping subassembly (32) are including setting firmly clamping frame (321) in the cylinder bottom, vertically on clamping frame (321) be equipped with two sets of clamping bars (322), clamping bar (322) bottom is equipped with first vacuum chuck (323), first vacuum chuck (323) adsorb respectively at FPC board both ends.
3. The FPC board drilling machine according to claim 2, characterized in that: one group of the clamping rods (322) is provided with a fifth cylinder (324), the fifth cylinder (324) is arranged on the clamping frame (321), the fifth cylinder (324) is used for shaking one group of the clamping rods (322) up and down, the other group of the clamping rods (322) is fixedly arranged on the clamping frame (321), and a abutting component (33) is arranged beside the clamping component (32).
4. The FPC board drilling machine of claim 3, wherein: support tight subassembly (33) including setting up the piece (331) that supports by centre gripping subassembly (32), support tight piece (331) and set up in frame (1), support to be equipped with the sixth lead screw between tight piece (331) and frame (1) and be connected, support tight piece (331) threaded connection on the sixth lead screw, support tight piece (331) fixed mounting on sixth cylinder (332).
5. The FPC board drilling machine according to claim 1, characterized in that: the transmission plate (53) is provided with a guide rail (7), and the other end of the second cylinder clamping jaw (55) is slidably mounted on the guide rail (7).
6. The FPC board drilling machine according to claim 1, characterized in that: the material receiving device (6) comprises a third screw rod (61) arranged on the rack (1) and a clamping part (62) with the top fixed on the third screw rod (61), a third air cylinder (63) is arranged between the clamping part (62) and the rack (1), and the third air cylinder (63) is used for controlling the clamping part (62) to ascend and descend.
7. The FPC board drilling machine of claim 6, wherein: clamping part (62) is including setting firmly mounting bracket (621) in the cylinder bottom, the vertical at least one supporting rod that is equipped with on mounting bracket (621), the supporting rod bottom is equipped with second vacuum chuck.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920581668.8U CN210025545U (en) | 2019-04-25 | 2019-04-25 | FPC board drilling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920581668.8U CN210025545U (en) | 2019-04-25 | 2019-04-25 | FPC board drilling machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210025545U true CN210025545U (en) | 2020-02-07 |
Family
ID=69361965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920581668.8U Active CN210025545U (en) | 2019-04-25 | 2019-04-25 | FPC board drilling machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210025545U (en) |
-
2019
- 2019-04-25 CN CN201920581668.8U patent/CN210025545U/en active Active
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