CN216544334U - Novel injection molding machine - Google Patents
Novel injection molding machine Download PDFInfo
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- CN216544334U CN216544334U CN202120976476.4U CN202120976476U CN216544334U CN 216544334 U CN216544334 U CN 216544334U CN 202120976476 U CN202120976476 U CN 202120976476U CN 216544334 U CN216544334 U CN 216544334U
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- injection tube
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Abstract
The utility model discloses a novel injection molding machine, which relates to the technical field of injection molding machines and comprises a bottom case, an injection tube and a recovery backflow tube group, wherein four corners of the bottom surface of the bottom case are fixedly connected with supporting legs, an inner cavity is arranged in the bottom case, the left end and the right end of the bottom surface of the injection tube are fixedly connected with supporting rods, the injection tube is positioned at the center of the upper surface of the bottom case and is fixedly connected with the upper surface of the bottom case through the supporting rods arranged on the bottom surface, the center of the left end of the injection tube is fixedly connected with a discharge tube, the recovery backflow tube group consists of a heating tube, a recovery tube and an ascending tube, the outer side surface of the heating tube is wound with an electric wire, the left side and the right side of the top of the outer surface of the heating tube are vertically and upwards fixedly connected with connecting rods, and the heating tube is fixedly connected with the top surface in the inner cavity through the two connecting rods; the utility model has the beneficial effects that: the plastic cooled during the transport is re-softened and recycled.
Description
Technical Field
The utility model relates to the technical field of injection molding machines, in particular to a novel injection molding machine.
Background
The injection molding machine is named as an injection molding machine or an injection machine, and is main molding equipment for manufacturing plastic products with various shapes by thermoplastic plastics or thermosetting plastics through a plastic molding die. The injection molding machine heats the plastic, applies high pressure to the molten plastic, enables the molten plastic to be injected to fill the mold cavity, and completes injection molding operation after the plastic is cooled and molded. The existing injection molding machine is used for cooling and solidifying molten plastic into particles in a conveying process after being used for too long time in the injection molding process, the cooled plastic is easy to block a conveying pipeline, injection molding operation is influenced, and plastic waste is easy to cause.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems and the defects, and provides a novel injection molding machine, which automatically recovers cooled and solidified plastic, softens and recovers the plastic again and puts the plastic into injection molding operation again.
In order to achieve the purpose, the adopted technical scheme is as follows:
novel injection molding machine, bottom case, injection tube and recovery backflow tube set
Supporting legs are fixedly connected to four corners of the bottom surface of the bottom box, an inner cavity is formed in the bottom box, supporting rods are fixedly connected to the left end and the right end of the bottom surface of the injection tube, the injection tube is located at the center of the upper surface of the bottom box, the injection tube is fixedly connected with the upper surface of the bottom box through the supporting rods arranged on the bottom surface, and a discharge tube is fixedly connected to the center of the left end of the injection tube;
the recycling backflow pipe group consists of a heating pipe, a recycling pipe and an ascending pipe, the outer side surface of the heating pipe is wound with an electric wire, the left side and the right side of the top of the outer surface of the heating pipe are vertically and upwards fixedly connected with connecting rods, the heating pipe is fixedly connected with the top surface in the inner cavity through the two connecting rods, the recovery pipe is positioned at the left end of the heating pipe, the upper end of the recovery pipe penetrates through the upper surface of the bottom box, the recovery pipe is fixedly connected with the upper surface of the bottom box, the top of the recovery pipe is welded and fixed with the center of the bottom surface of the discharge pipe, the right end of the recovery pipe is fixedly connected with the left end of the heating pipe, the ascending pipe is positioned at the right end of the heating pipe and vertically and upwards penetrates through the upper surface of the bottom box, the ascending pipe is fixedly connected with the upper surface of the bottom box, and the right end of the heating pipe is fixedly connected with the left side surface of the bottom end of the ascending pipe;
the ascending tube is positioned on the right side of the injection tube, the upper surface of the bottom case is fixedly connected with a motor table positioned between the injection tube and the ascending tube, the upper surface of the motor table is fixedly connected with a second motor, the center of the left side of the second motor is fixedly connected with a second rotating shaft, a screw rod is arranged in the injection tube, the left end of the second rotating shaft penetrates through the right side surface of the injection tube, the second rotating shaft is connected with the right side surface of the injection tube in a sliding manner, the left end of the second rotating shaft is fixedly connected with the right end of the screw rod, and the second motor drives the screw rod to rotate in the injection tube through the second rotating shaft;
the inner cavity inner bottom surface center is vertically and upwardly rotatably connected with a recovery rotating shaft, the inner cavity inner bottom surface is fixedly connected with a first motor, the first motor top surface center is fixedly connected with a first rotating shaft, the top end of the recovery rotating shaft penetrates through the outer side surface of the right end of the heating pipe, the recovery rotating shaft is positioned in the heating pipe, a plurality of shifting blades are fixedly connected to the side surface of the top end of the recovery rotating shaft at equal intervals, each shifting blade is positioned in the heating pipe, the middle end of the recovery rotating shaft is fixedly connected with a second driving plate, a lifting rotating shaft is arranged at the center in the lifting pipe, the top end of the lifting rotating shaft is rotatably connected with the inner top surface of the lifting pipe, the lower end of the lifting rotating shaft penetrates through the bottom end of the lifting pipe, the lifting rotating shaft is rotatably connected with the bottom end of the lifting pipe, and the bottom end of the lifting rotating shaft is rotatably connected with the inner cavity inner bottom surface, the side surface of the ascending rotating shaft is provided with a packing auger piece positioned in the ascending pipe, the lower end of the ascending rotating shaft is fixedly connected with a first driving plate, the first driving plate is provided with an ascending transmission belt between the first rotating shaft, the first driving plate passes through the ascending transmission belt and is connected with the first rotating shaft in a transmission manner, the first rotating shaft is provided with a recovery transmission belt between the second driving plate, and the second driving plate passes through the recovery transmission belt and is connected with the first rotating shaft in a transmission manner.
Better, injection tube right-hand member upside fixedly connected with feeder hopper, the injection tube passes through feeder hopper and external intercommunication, the discharging pipe with the injection tube communicates each other, the external moulding equipment of plastics cooling of discharging pipe left end.
Preferably, the recovery pipe is communicated with the discharge pipe, the heating pipe, the recovery pipe and the ascending pipe are communicated with each other, and the electric wire wound outside the heating pipe is externally connected with an alternating current power supply device.
Preferably, a blanking pipe is fixedly connected to the left side of the top end of the ascending pipe, the left end of the blanking pipe is located above the feeding hopper, the ascending pipe is communicated with the outside through the blanking pipe, and the blanking pipe is of a structure with a low left end and a high right end.
Preferably, the heating pipe is made of metal, the elastic sheet is installed at the upper end of the inner wall of the recovery pipe, and the inner diameter of the left end of the discharge pipe is smaller than that of the right end of the discharge pipe.
By adopting the technical scheme, the beneficial effects are as follows:
the recycling pipe recycles the accumulated plastic, the melted plastic is guided into the feed hopper, the second motor is started, the second motor drives the screw rod to rotate through the second rotating shaft, the screw rod rotates to drive the melted plastic in the injection tube to move towards the left end of the injection tube, the melted plastic flows to an external molding device through the discharge tube, the melted plastic is cooled in the discharge tube once to generate plastic particles, the inner diameter of the left end of the discharge tube is smaller than that of the right end of the discharge tube, the recycling pipe is connected with the change part of the inner diameter of the discharge tube, when the plastic particles are blocked at the change part of the inner diameter of the discharge tube due to larger diameter, the plastic particles are downwards extruded under the subsequent plastic extrusion acting force, the elastic sheet is deformed by extrusion, the plastic particles are extruded to fall off the elastic sheet, the plastic particles enter the heating pipe through the recycling pipe, the electric wire is started, the electric wire is externally connected with high-frequency alternating current, the heating pipe is made of metal, and the heating pipe generates heat by using the eddy current effect, melt plastics, it drives first pivot rotation to open first motor, first pivot drives the second through retrieving the drive belt and drives the board rotation, the second drives the pivot rotation of the recovery of center department fixed connection of board drive, it rotates to retrieve the leaf of dialling in the pivot drives the heating tube, it drives plastics and gets into the tedge to dial the leaf, first pivot drives the tedge through rising drive belt and first drive board and rotates, the auger piece of installation upwards transmits plastics in the first pivot, plastics fall into the feeder hopper through the blanking pipe, above the effect that can realize retrieving and drop into the refrigerated plastic granules once more of structure.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly described below. Wherein the drawings are only for purposes of illustrating some embodiments of the utility model and are not to be construed as limiting the utility model to all embodiments thereof.
FIG. 1 is a schematic perspective view of the overall front view of the present invention;
FIG. 2 is a schematic cross-sectional view of the front bottom case of the present invention;
FIG. 3 is a front view of the present invention;
FIG. 4 is a schematic top view of the structure of the recycling shaft and the leaf-pulling position of the present invention.
The labels in the figure are: the device comprises a bottom box 1, supporting legs 2, an inner cavity 3, a heating pipe 4, an electric wire 41, a connecting rod 42, a recovery pipe 43, an elastic sheet 44, an ascending pipe 5, an auger sheet 51, a first driving plate 52, an ascending rotating shaft 53, a first motor 6, a first rotating shaft 61, an ascending transmission belt 62, a recovery rotating shaft 7, a second driving plate 71, a recovery transmission belt 72, a shifting blade 73, an injection cylinder 8, a supporting rod 81, a feeding hopper 82, a screw 83, a discharging pipe 9, a blanking pipe 10, a motor platform 11, a second motor 12 and a second rotating shaft 1201.
Detailed Description
Referring to fig. 1 to 4, the present application is a novel injection molding machine, a bottom case 1, an injection tube 8 and a recycling return tube group
Supporting legs 2 are fixedly connected to four corners of the bottom surface of the bottom case 1, an inner cavity 3 is arranged in the bottom case 1, supporting rods 81 are fixedly connected to the left end and the right end of the bottom surface of the injection tube 8, the injection tube 8 is located at the center of the upper surface of the bottom case 1, the injection tube 8 is fixedly connected with the upper surface of the bottom case 1 through the supporting rods 81 arranged on the bottom surface, and a discharge tube 9 is fixedly connected to the center of the left end of the injection tube 8;
the recycling backflow pipe group comprises a heating pipe 4, a recycling pipe 43 and an ascending pipe 5, wherein an electric wire 41 is wound on the outer side surface of the heating pipe 4, connecting rods 42 are vertically and upwards fixedly connected to the left side and the right side of the top of the outer surface of the heating pipe 4, the heating pipe 4 is fixedly connected with the top surface inside the inner cavity 3 through the two connecting rods 42, the recycling pipe 43 is positioned at the left end of the heating pipe 4, the upper end of the recycling pipe 43 penetrates through the upper surface of the bottom box 1, the recycling pipe 43 is fixedly connected with the upper surface of the bottom box 1, the top of the recycling pipe 43 is fixedly welded and fixed with the center of the bottom surface of the discharging pipe 9, the right end of the recycling pipe 43 is fixedly connected with the left end of the heating pipe 4, the ascending pipe 5 is positioned at the right end of the heating pipe 4, the ascending pipe 5 vertically and upwards penetrates through the upper surface of the bottom box 1, and the ascending pipe 5 is fixedly connected with the upper surface of the bottom box 1, the right end of the heating pipe 4 is fixedly connected with the left side face of the bottom end of the ascending pipe 5;
the ascending tube 5 is located on the right side of the injection tube 8, the upper surface of the bottom case 1 is fixedly connected with a motor table 11 located between the injection tube 8 and the ascending tube 5, the upper surface of the motor table 11 is fixedly connected with a second motor 12, the center of the left side of the second motor 12 is fixedly connected with a second rotating shaft 1201, a screw 83 is arranged in the injection tube 8, the left end of the second rotating shaft 1201 penetrates through the right side surface of the injection tube 8, the second rotating shaft 1201 is slidably connected with the right side surface of the injection tube 8, the left end of the second rotating shaft 1201 is fixedly connected with the right end of the screw 83, and the second motor 12 drives the screw 83 to rotate in the injection tube 8 through the second rotating shaft 1201;
the inner bottom surface center of the inner cavity 3 is vertically and upwardly connected with a recovery rotating shaft 7 in a rotating manner, the inner bottom surface of the inner cavity 3 is fixedly connected with a first motor 6, the top surface center of the first motor 6 is fixedly connected with a first rotating shaft 61, the top end of the recovery rotating shaft 7 penetrates through the outer side surface of the right end of the heating pipe 4, the recovery rotating shaft 7 is positioned inside the heating pipe 4, the side surface of the top end of the recovery rotating shaft 7 is fixedly connected with a plurality of shifting blades 73 at equal intervals, each shifting blade 73 is positioned inside the heating pipe 4, the middle end of the recovery rotating shaft 7 is fixedly connected with a second driving plate 71, the inner center of the ascending pipe 5 is provided with an ascending rotating shaft 53, the top end of the ascending rotating shaft 53 is rotatably connected with the inner top surface of the ascending pipe 5, the lower end of the ascending rotating shaft 53 penetrates through the bottom end of the ascending pipe 5, and the ascending rotating shaft 53 is rotatably connected with the bottom end of the ascending pipe 5, the bottom end of the ascending rotating shaft 53 is rotatably connected with the bottom surface in the inner cavity 3, the side surface of the ascending rotating shaft 53 is provided with an auger piece 51 positioned in the ascending pipe 5, the lower end of the ascending rotating shaft 53 is fixedly connected with a first driving plate 52, an ascending transmission belt 62 is arranged between the first driving plate 52 and the first rotating shaft 61, the first driving plate 52 is in transmission connection with the first rotating shaft 61 through the ascending transmission belt 62, a recovery transmission belt 72 is arranged between the first rotating shaft 61 and the second driving plate 71, and the second driving plate 71 is in transmission connection with the first rotating shaft 61 through the recovery transmission belt 72;
specifically, the upper side of the right end of the injection tube 8 is fixedly connected with a feed hopper 82, the injection tube 8 is communicated with the outside through the feed hopper 82, the discharge tube 9 is communicated with the injection tube 8, and the left end of the discharge tube 9 is externally connected with a plastic cooling and shaping device; the recovery pipe 43 is communicated with the discharge pipe 9, the heating pipe 4, the recovery pipe 43 and the ascending pipe 5 are communicated with each other, and the electric wire 41 wound on the outer side of the heating pipe 4 is externally connected with an alternating current power supply device; a blanking pipe 10 is fixedly connected to the left side of the top end of the ascending pipe 5, the left end of the blanking pipe 10 is located above the feed hopper 82, the ascending pipe 5 is communicated with the outside through the blanking pipe 10, and the blanking pipe 10 is of a structure with a low left end and a high right end; the heating pipe 4 is made of metal, the upper end of the inner wall of the recovery pipe 43 is provided with an elastic sheet 44, and the inner diameter of the left end of the discharging pipe 9 is smaller than that of the right end.
In the embodiment, molten plastic is poured into a feeding hopper 82, the plastic enters the injection tube 8 through the feeding hopper 82, a second motor 12 is started, the second motor 12 drives a screw 83 to rotate through a second rotating shaft 1201, the screw 83 stirs the plastic to be conveyed to the left end of the injection tube 8, the plastic at the left end of the injection tube 8 is conveyed to a discharge tube 9, the plastic is conveyed to an external shaping device through the discharge tube 9, the plastic cooled during the conveying process forms plastic particles, when the diameter of the plastic particles is larger than the inner diameter of the left end of the discharge tube 9, the plastic particles are blocked at the inner diameter change positions at the left end and the right end of the discharge tube 9, the plastic blocking and subsequently conveyed plastic continuously increases the pressure, the plastic downwardly extrudes an elastic sheet 44, the elastic sheet 44 is pressed and deformed, the plastic particles are extruded into a recovery tube 43 by the plastic, an electric wire 41 is wound outside a heating tube 4, the electric wire 41 is externally connected with high-frequency alternating current, the heating tube 4 is made of metal, and the high-frequency alternating current coil can generate a strong magnetic field with periodic change, according to the eddy current effect, when metal is located in a changing magnetic field, the metal can generate induced electromotive force in the magnetic field to generate strong current, the current flows in the metal along a closed loop to generate a large amount of heat, the heating pipe 4 generates heat to melt plastic particles, the first motor 6 is started, the upper end of the first motor 6 is fixedly connected with the first rotating shaft 61, the first motor 6 drives the first rotating shaft 61 to rotate, the first rotating shaft 61 is provided with a lifting transmission belt 62 and a recovery transmission belt 72, the first rotating shaft 61 drives the first driving plate 52 to rotate through the lifting transmission belt 62, the first rotating shaft 61 drives the second driving plate 71 to rotate through the recovery transmission belt 72, the first driving plate 52 drives the lifting rotating shaft 53 to rotate, the second driving plate 71 drives the recovery rotating shaft 7 to rotate, the recovery rotating shaft 7 drives the shifting blade 73 located in the heating pipe 4 to rotate, the shifting blade 73 drives plastic to be conveyed into the ascending pipe 5, the recycling rotating shaft 7 drives the auger piece 51 mounted on the recycling rotating shaft to do circular motion, the melted plastic is conveyed upwards through the circular motion of the auger piece 51, the upwards conveyed plastic flows out of the blanking pipe 10 and falls into the feeding hopper 82, the recycling of the cooled and solidified plastic is realized, and the effect of re-softening and recycling the cooled plastic can be realized through the structure;
molten plastic is fed into the feeding hopper 82, the molten plastic moves leftwards under the action of the screw 83 and is injected into the discharging pipe 9, the molten plastic enters into an external plastic cooling and molding device through the discharging pipe 9, the plastic which is cooled and solidified into plastic particles during conveying is blocked at the joint of the discharging pipe 9 and the recovery pipe 43, the plastic which is cooled and solidified under the hydraulic action of the liquid plastic extrudes the elastic sheet 44 to enter into the recovery pipe 43, the heating pipe 4 is heated under the action of the vortex effect, the plastic is remelted, the effect of recooling the cooled plastic is achieved, and the plastic is fed into the feeding hopper 82 through the ascending pipe 5 and the blanking pipe 10 through the shifting blade 73, so that the effect of recovering the cooled plastic is achieved.
Claims (5)
1. The utility model provides a novel injection molding machine, includes under casing (1), injection tube (8) and retrieves the flow pipe group, its characterized in that:
four corners of the bottom surface of the bottom box (1) are fixedly connected with supporting feet (2), an inner cavity (3) is formed in the bottom box (1), supporting rods (81) are fixedly connected to the left end and the right end of the bottom surface of the injection tube (8), the injection tube (8) is located at the center of the upper surface of the bottom box (1), the injection tube (8) is fixedly connected with the upper surface of the bottom box (1) through the supporting rods (81) installed on the bottom surface, and a discharge tube (9) is fixedly connected to the center of the left end of the injection tube (8);
the recycling backflow pipe group comprises a heating pipe (4), a recycling pipe (43) and an ascending pipe (5), an electric wire (41) is wound on the outer side surface of the heating pipe (4), the left side and the right side of the top of the outer surface of the heating pipe (4) are vertically and upwards fixedly connected with connecting rods (42), the heating pipe (4) is fixedly connected with the inner top surface of the inner cavity (3) through the two connecting rods (42), the recycling pipe (43) is located at the left end of the heating pipe (4), the upper end of the recycling pipe (43) penetrates through the upper surface of the bottom box (1), the recycling pipe (43) is fixedly connected with the upper surface of the bottom box (1), the top of the recycling pipe (43) is fixedly welded with the center of the bottom surface of the discharging pipe (9), the right end of the recycling pipe (43) is fixedly connected with the left end of the heating pipe (4), the ascending pipe (5) is located at the right end of the heating pipe (4), the ascending pipe (5) vertically and upwards penetrates through the upper surface of the bottom box (1), the ascending pipe (5) is fixedly connected with the upper surface of the bottom box (1), and the right end of the heating pipe (4) is fixedly connected with the left side surface of the bottom end of the ascending pipe (5);
the ascending tube (5) is located on the right side of the injection tube (8), the upper surface of the bottom case (1) is fixedly connected with a motor table (11) located between the injection tube (8) and the ascending tube (5), the upper surface of the motor table (11) is fixedly connected with a second motor (12), the center of the left side of the second motor (12) is fixedly connected with a second rotating shaft (1201), a screw rod (83) is arranged in the injection tube (8), the left end of the second rotating shaft (1201) penetrates through the right side face of the injection tube (8), the second rotating shaft (1201) is in sliding connection with the right side face of the injection tube (8), the left end of the second rotating shaft (1201) is fixedly connected with the right end of the screw rod (83), and the second motor (12) drives the screw rod (83) to rotate in the injection tube (8) through the second rotating shaft (1201);
the inner bottom surface center of the inner cavity (3) is vertically upwards rotated and connected with a recovery rotating shaft (7), the inner bottom surface of the inner cavity (3) is fixedly connected with a first motor (6), the top surface center of the first motor (6) is fixedly connected with a first rotating shaft (61), the top end of the recovery rotating shaft (7) penetrates through the outer side surface of the right end of the heating pipe (4), the recovery rotating shaft (7) is positioned inside the heating pipe (4), a plurality of shifting blades (73) are fixedly connected to the side surface of the top end of the recovery rotating shaft (7) at equal intervals, each shifting blade (73) is positioned inside the heating pipe (4), the middle end of the recovery rotating shaft (7) is fixedly connected with a second driving plate (71), an ascending rotating shaft (53) is arranged at the inner center of the ascending pipe (5), and the top end of the ascending rotating shaft (53) is rotatably connected with the inner top surface of the ascending pipe (5), the lower end of the ascending shaft (53) penetrates through the bottom end of the ascending pipe (5), the ascending shaft (53) is rotatably connected with the bottom end of the ascending pipe (5), the bottom end of the ascending rotating shaft (53) is rotatably connected with the bottom surface in the inner cavity (3), the side surface of the ascending rotating shaft (53) is provided with a packing auger piece (51) positioned in the ascending pipe (5), the lower end of the lifting rotating shaft (53) is fixedly connected with a first driving plate (52), an ascending transmission belt (62) is arranged between the first driving plate (52) and the first rotating shaft (61), the first driving plate (52) is in transmission connection with the first rotating shaft (61) through the ascending transmission belt (62), a recovery transmission belt (72) is arranged between the first rotating shaft (61) and the second driving plate (71), the second driving plate (71) is in transmission connection with the first rotating shaft (61) through the recovery transmission belt (72).
2. The novel injection molding machine of claim 1, wherein: injection tube (8) right-hand member upside fixedly connected with feeder hopper (82), injection tube (8) are passed through feeder hopper (82) and external intercommunication, discharging pipe (9) with injection tube (8) intercommunication each other, the external plastic cooling moulding equipment of discharging pipe (9) left end.
3. The novel injection molding machine of claim 1, wherein: the recycling pipe (43) is communicated with the discharging pipe (9), the heating pipe (4), the recycling pipe (43) and the ascending pipe (5) are communicated with each other, and the recycling pipe is wound on the outer side of the heating pipe (4) and is externally connected with alternating current power supply equipment through the electric wire (41).
4. A novel injection molding machine as claimed in claim 2, wherein: the lifting pipe is characterized in that a blanking pipe (10) is fixedly connected to the left side of the top end of the lifting pipe (5), the left end of the blanking pipe (10) is located above the feeding hopper (82), the lifting pipe (5) is communicated with the outside through the blanking pipe (10), and the blanking pipe (10) is of a structure with the left end low and the right end high.
5. The novel injection molding machine of claim 1, wherein: heating pipe (4) are the metal material, elastic sheet (44) are installed to recovery pipe (43) inner wall upper end, discharging pipe (9) left end internal diameter is less than the right-hand member internal diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120976476.4U CN216544334U (en) | 2021-05-08 | 2021-05-08 | Novel injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120976476.4U CN216544334U (en) | 2021-05-08 | 2021-05-08 | Novel injection molding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216544334U true CN216544334U (en) | 2022-05-17 |
Family
ID=81537038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120976476.4U Active CN216544334U (en) | 2021-05-08 | 2021-05-08 | Novel injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216544334U (en) |
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2021
- 2021-05-08 CN CN202120976476.4U patent/CN216544334U/en active Active
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