CN215903766U - Concrete fine treatment conveying device - Google Patents
Concrete fine treatment conveying device Download PDFInfo
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- CN215903766U CN215903766U CN202120237432.XU CN202120237432U CN215903766U CN 215903766 U CN215903766 U CN 215903766U CN 202120237432 U CN202120237432 U CN 202120237432U CN 215903766 U CN215903766 U CN 215903766U
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Abstract
The utility model discloses a concrete fine treatment conveying device which comprises a mounting frame, a material storage barrel, a fine mixing mechanism, a conveying mechanism and a control mechanism, wherein the material storage barrel, the fine mixing mechanism and the conveying mechanism are electrically connected to the control mechanism; the storage barrel is arranged on one side of the mounting frame and communicated to the upper part of the weighing mechanism through a lifting machine, and the weighing mechanism is provided with a feeding gate; the bottom of compounding bucket all is provided with row material gate, conveying mechanism set up in when arbitrary station of rotatory workstation row material gate is under.
Description
Technical Field
The utility model relates to the field of automation, in particular to a concrete fine processing and conveying device.
Background
Along with the development of automation technology, a lot of traditional constructions are slowly replaced by automation equipment, especially in the aspect of model and mould preparation of concrete, the preparation of large-scale concrete model and mould is mostly accomplished by 3D printing apparatus automation at present, has improved preparation precision and preparation efficiency greatly.
The consumptive material transport mode of current 3D printing apparatus has two kinds, one kind is direct pumping formula, another kind is to adopt the grouter to add the conveyer pipe compression and carries, no matter which kind of mode all need go on the concrete ratio of refining and the even feed of stirring back again, because 3D prints the requirement higher, if the ratio of concrete and earlier stage treatment differ to some extent, can cause and print the in-process can not fast fixed type and sink or there is the bubble and produce the defect, consequently the mixed processing of concrete is accomplished by the manual work, but manual processing efficiency is extremely low, often can not keep up with the speed that 3D printed, and there are more human errors, the concrete that leads to every batch has slight error, influence the quality of concrete model or mould.
Therefore, a new concrete refining and conveying device is needed to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a new technical scheme for concrete refining treatment.
According to a first aspect of the utility model, a concrete fine processing and conveying device is provided, which comprises a mounting frame, a material storage barrel, a fine mixing mechanism, a conveying mechanism and a control mechanism, wherein the material storage barrel, the fine mixing mechanism and the conveying mechanism are electrically connected to the control mechanism, the fine mixing mechanism is mounted on the mounting frame, the fine mixing mechanism comprises a rotary workbench, a weighing mechanism and a stirring mechanism, a plurality of material mixing barrels are uniformly arranged on the rotary workbench, the weighing mechanism and the stirring mechanism are uniformly arranged and mounted on the mounting frame above the rotary workbench, a liquid inlet pipe is arranged on the stirring mechanism, and a liquid inlet valve and a flow meter are arranged on the liquid inlet pipe; the storage barrel is arranged on one side of the mounting frame and communicated to the upper part of the weighing mechanism through a lifting machine, and the weighing mechanism is provided with a feeding gate; the bottom of compounding bucket all is provided with row material gate, conveying mechanism set up in when arbitrary station of rotatory workstation row material gate is under.
Preferably, the swivel work head includes rotary mechanism and lifting mechanism, lifting mechanism install to on the mounting bracket, rotary mechanism install to on the lifting mechanism, rotary mechanism includes rotary disk and rotating electrical machines, the rotating electrical machines drive the rotary disk rotates, the compounding bucket install to on the rotary disk.
Preferably, the lifting mechanism comprises a lifting platform, a lifting motor and a lifting screw rod, the lifting screw rod is mounted at the bottom of the lifting platform, the lifting motor is mounted on the mounting frame, the lifting motor is in threaded connection with the lifting screw rod through a threaded sleeve, the rotating disc is rotatably connected to the lifting platform, and the rotating motor is mounted on the lifting platform.
Preferably, the lifting screw rods are arranged in two, the lifting screw rods are symmetrically arranged on two sides of the center of the lifting platform, a plurality of guide rods are arranged at the bottom of the lifting platform, and the guide rods are vertically arranged and slidably connected onto the mounting frame.
Preferably, the weighing mechanism comprises a weighing frame, a guide cylinder, a dust-proof cylinder and the feeding gate, the bottom of the weighing frame is mounted on the mounting frame through a pressure sensor, the feeding gate is connected to the top of the weighing frame in a sliding manner, one side of the feeding gate is provided with a push-pull cylinder, the guide cylinder is arranged at the bottom of the weighing frame, and the dust-proof cylinder is arranged above the feeding gate and mounted at an outlet of the elevator.
Preferably, the feeding gate is provided with a push-pull hole, the end of a piston rod of the push-pull cylinder is provided with a push-pull rod which is vertically arranged, the push-pull rod is inserted into the push-pull hole, and the diameter of the push-pull hole is larger than that of the push-pull rod.
Preferably, four mixing barrels are uniformly arranged, the stirring mechanism comprises a rough mixing stirrer, a fine mixing stirrer and a discharging stirrer, a sealing cover is arranged at the top of a stirring blade of the rough mixing stirrer, and the liquid inlet pipe is arranged on the sealing cover.
Preferably, be provided with a plurality of positioning mechanism around the mounting bracket, positioning mechanism includes locating rack, location jar and locating plate, the locating rack install extremely on the mounting bracket, the location jar install extremely on the locating rack and towards the axis of rotatory workstation is arranged, the locating plate install extremely the tailpiece of the piston rod portion of location jar, be provided with a plurality of location guide bars on the locating plate, location guide bar sliding connection to on the locating rack.
Preferably, the bottom of the mixing barrel is provided with a discharge port on the rotary disk, the discharge gate comprises a gate plate and a rotary handle, the bottom of the rotary handle is fixed on the gate plate, the rotary handle is rotationally connected to the rotary disk, a reinforcing groove is arranged on the edge of the discharge port, and the gate plate is slidably connected to the reinforcing groove.
Preferably, the both sides of mounting bracket are provided with puts the thing platform, control mechanism and the storage bucket all install extremely put the thing bench, mounting bracket bottom four corners is provided with the universal wheel.
According to one embodiment of the disclosure, the device is used for carrying out fine treatment and conveying on the concrete, the concrete can be quantitatively added and quantitatively added with water for mixing according to the weight of the concrete, and the proportioning precision is improved;
the concrete mixer has multiple stirring functions of coarse stirring, fine stirring, discharging stirring and the like, is beneficial to improving the stirring uniformity, can discharge bubbles in concrete, and improves the quality of slurry;
the degree of automation is high, need not artificial intervention, can extract the concrete automatically and carry out the processing that becomes more meticulous, has improved the treatment effeciency greatly, can avoid the human error that artificial intervention caused, makes the concrete quality of every batch balanced, guarantees the finished product quality after the 3D prints.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description, serve to explain the principles of the utility model.
Fig. 1 is a schematic structural diagram of a concrete refining processing and conveying device according to an embodiment of the present invention.
Fig. 2 is a schematic front view of the concrete refining and conveying device in fig. 1.
Fig. 3 is a schematic diagram of the position structure of the stirring mechanism and the weighing mechanism in fig. 2.
Fig. 4 is a schematic structural diagram of the rotating mechanism and the lifting mechanism in fig. 2.
Fig. 5 is a schematic view of the weighing mechanism of fig. 3.
Fig. 6 is a schematic view showing a connection structure of the feed gate and the push-pull rod in fig. 5.
Fig. 7 is a schematic structural view of the positioning mechanism in fig. 1.
Fig. 8 is a schematic view of the position structure of the mixing bowl and the discharge gate in fig. 4.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Examples
As shown in fig. 1 to 7, the concrete refining and conveying apparatus in this embodiment includes a mounting frame 1100, a storage barrel 1310, a fine mixing mechanism, a conveying mechanism 1400, and a control mechanism 1500, the storage barrel 1310, the fine mixing mechanism, and the conveying mechanism 1400 are all electrically connected to the control mechanism 1500, the fine mixing mechanism is mounted on the mounting frame 1100, the fine mixing mechanism includes a rotary table, a weighing mechanism 1230, and a stirring mechanism 1240, a plurality of mixing barrels 1260 are uniformly arranged on the rotary table, the weighing mechanism 1230 and the stirring mechanism 1240 are uniformly arranged and mounted on the mounting frame 1100 above the rotary table, a liquid inlet pipe 1250 is arranged on the stirring mechanism 1240, and a liquid inlet valve 1251 and a flow meter 1252 are arranged on the liquid inlet pipe 1250; the material storage barrel 1310 is arranged on one side of the mounting frame 1100 and communicated to the upper part of the weighing mechanism 1230 through a lifting machine 1320, and the weighing mechanism 1230 is provided with a feeding gate 1231; the bottom of the mixing barrel 1260 is provided with a discharge gate 1270, and the conveying mechanism 1400 is arranged right below the discharge gate 1270 at any station of the rotary workbench.
According to the scheme of the embodiment, concrete in the storage barrel 1310 is conveyed to the weighing mechanism 1230 through the lifting machine 1320, after the weighing mechanism 1230 weighs, the feeding gate 1231 is opened to enable the concrete to fall into the mixing barrel 1260, the mixing barrel 1260 reaches the position of the stirring mechanism 1240 under the driving of the rotary workbench, the control mechanism 1500 adds water according to the weighed weight, the flow meter 1252 monitors the water adding amount in real time, and after the water adding amount of the concrete reaches the weight, the liquid inlet valve 1251 is closed; the stirring mechanism 1240 stirs the materials during the charging process until the stirring is completed, the mixing barrel 1260 reaches the upper part of the conveying mechanism 1400 along with the rotation of the rotary table, and the discharge gate 1270 is opened to discharge the mixed materials into the conveying mechanism 1400 for conveying.
In this embodiment or other embodiments, the rotary table includes a rotating mechanism 1210 and a lifting mechanism 1220, the lifting mechanism 1220 is mounted on the mounting frame 1100, the rotating mechanism 1210 is mounted on the lifting mechanism 1220, the rotating mechanism 1210 includes a rotating disk 1211 and a rotating motor (not shown), the rotating motor drives the rotating disk 1211 to rotate, and the mixing barrel 1260 is mounted on the rotating disk 1211. The rotating disc 1211 is rotatably connected to the lifting mechanism 1220, and the rotating motor drives the rotating disc 1211 to rotate through a gear, so that different mixing barrels 1260 sequentially reach different stations; the rotating motor is provided with an electromagnetic brake, and can automatically brake after power failure, so that the accuracy of the stop position of the rotating disk 1211 is ensured.
In this embodiment or other embodiments, the lifting mechanism 1220 includes a lifting platform 1221, a lifting motor 1222, and a lifting screw 1223, the lifting screw 1223 is mounted to the bottom of the lifting platform 1221, the lifting motor 1222 is mounted to the mounting frame 1100, the lifting motor 1222 is screwed to the lifting screw 1223 through a screw sleeve (not shown), the rotating disk 1211 is rotatably connected to the lifting platform 1221, and the rotating motor is mounted to the lifting platform 1221.
The lifting motor 1222 rotates to drive the threaded sleeve to rotate, the threaded sleeve is in threaded connection with the lifting lead screw 1223 and can drive the lifting lead screw 1223 to ascend or descend so as to realize the ascending or descending of the lifting table 1221, so that the mixing barrel 1260 can move upwards to the weighing mechanism 1230 to receive materials and reach the stirring mechanism 1240 to stir, and the stirring mechanism 1240 and the weighing mechanism 1230 are not required to be provided with lifting devices, so that the production cost is reduced; and the lifting mechanism 1220 can keep all the mixing barrels 1260 to move synchronously, which is helpful for reducing the programming difficulty and the later equipment maintenance and upgrading.
In this embodiment or other embodiments, two lifting screw rods 1223 are provided, the two lifting screw rods 1223 are symmetrically provided at two sides of the center of the lifting platform 1221, a plurality of guide rods 1224 are provided at the bottom of the lifting platform 1221, and the guide rods 1224 are vertically arranged and slidably connected to the mounting frame 1100. Play stable effect to the lift of lifting platform 1221, avoid heeling the rabbling mechanism 1240 that leads to and fish tail compounding bucket 1260 or the concrete can't effectively fall into compounding bucket 1260.
The guide rods 1224 in this embodiment are provided with position indicating plates, and the mounting frame 1100 is provided with proximity switches, which detect the position of the position indicating plates, thereby obtaining the specific height of the lifting platform 1221.
In this or other embodiments, the weighing mechanism 1230 includes a weighing frame 1232, a guiding cylinder 1235, a dust cylinder 1234 and the feeding gate 1231, the bottom of the weighing frame 1232 is mounted on the mounting frame 1100 through a pressure sensor (not shown), the feeding gate 1231 is slidably connected to the weighing frame 1232, a push-pull cylinder 1233 is disposed on one side of the feeding gate 1231, the guiding cylinder 1235 is disposed at the bottom of the weighing frame 1232, and the dust cylinder 1234 is disposed above the feeding gate 1231 and mounted to the outlet of the elevator 1320.
In this embodiment or other embodiments, the feeding gate 1231 is provided with a push-pull hole 1231-1, the end of the piston rod of the push-pull cylinder 1233 is provided with a vertically arranged push-pull rod 1233-1, the push-pull rod 1233-1 is inserted into the push-pull hole 1231-1, and the diameter of the push-pull hole 1231-1 is larger than that of the push-pull rod 1233-1. The feeding gate 1231 is not supported by the push-pull cylinder 1233 in the vertical direction, and only the pressure sensor at the bottom of the weighing frame 1232 is supported on the mounting frame 1100, so that the weighing precision is prevented from being influenced by the support of the push-pull cylinder 1233 in the weighing process.
In this embodiment or other embodiments, mixing bucket 1260 has evenly arranged four, rabbling mechanism 1240 includes coarse mixing mixer 1241, fine mixing mixer 1242 and row material mixer 1243, the concrete is after falling into mixing bucket 1260, at first add water and coarse mixing, make concrete and water intensive mixing, then rotate to fine mixing mixer 1242 department and carry out the meticulous stirring, the bubble in the concrete is discharged under the prerequisite that further improves the stirring effect, arrange the material stirring when rotatory to arranging material mixer 1243 department, not only can improve the effect of arranging the material and arrange the abundant of material, can also avoid the concrete because of standing phenomenon such as infiltration bubble or precipitation moisture for a long time, keep the quality after the concrete mixes.
The top of the stirring blade of the rough mixing stirrer 1241 is provided with a sealing cover 1241-1, and the liquid inlet pipe 1250 is arranged on the sealing cover 1241-1 to improve the sealing performance and avoid splashing of concrete or water in the water adding and stirring process, so that the error caused by splashing in the water-cement ratio during mixing is greatly reduced, and the mixing precision and the mixing uniformity are improved.
In this embodiment or other embodiments, a plurality of positioning mechanisms 1110 are disposed around the mounting frame 1100, the positioning mechanisms 1110 include a positioning frame 1111, a positioning cylinder 1113 and a positioning plate 1112, the positioning frame 1111 is mounted to the mounting frame 1100, the positioning cylinder 1113 is mounted to the positioning frame 1111 and arranged toward the central axis of the rotating table, the positioning plate 1112 is mounted to the end of the piston rod of the positioning cylinder 1113, a plurality of positioning guide rods 1114 are disposed on the positioning plate 1112, and the positioning guide rods 1114 are slidably connected to the positioning frame 1111.
In this embodiment or other embodiments, the rotary disk 1211 at the bottom of the mixing barrel 1260 is provided with a discharge outlet (not shown), the discharge gate 1270 comprises a gate 1271 and a rotary handle 1272, the bottom of the rotary handle 1272 is fixed to the gate 1271, the rotary handle 1272 is rotatably connected to the rotary disk 1211, a reinforcing groove 1211-1 is arranged at the edge of the discharge outlet, and the gate 1271 is slidably connected to the reinforcing groove 1211-1.
The gate 1271 is rotated and slid along the reinforcement groove 1211-1 by rotating the rotary handle 1272, so that the discharge opening is exposed and the concrete falls into the bottom conveying mechanism 1400, wherein the rotary handle 1272 can be manual or motor-driven.
In this embodiment or other embodiments, two sides of the mounting frame 1100 are provided with object placing tables 1120, the control mechanism 1500 and the material storage barrel 1310 are both mounted on the object placing tables 1120, and four corners of the bottom of the mounting frame 1100 are provided with universal wheels 1130. Make things convenient for this device to wholly remove to adapt to arranging and removing of 3D printer.
A monitoring camera 1140 is also included in this embodiment, the monitoring camera 1140 being disposed toward the fine mixing mechanism to monitor the operating conditions of the equipment.
When the device is used, the hoister 1320 lifts the dry concrete in the storage barrel 1310 to the feeding gate 1231 of the weighing mechanism 1230, and after weighing a certain weight or a certain time, the feeding gate 1231 is opened to enable the concrete to fall into the mixing barrel 1260 at the bottom;
the rotary worktable rotates for a certain angle to enable the mixing barrel 1260 to reach the position below the rough mixing stirrer 1241, the lifting mechanism 1220 rises to enable the mixing barrel 1260 to be sleeved outside a stirring blade of the rough mixing stirrer 1241, the control mechanism 1500 adds water according to the weighed weight, the flow meter 1252 monitors the water adding amount in real time, the liquid inlet valve 1251 is closed after the water adding amount of the concrete reaches the weight, and stirring is carried out in the water adding process;
after stirring for a certain time, the lifting mechanism 1220 descends, the rotary worktable rotates to enable the mixing barrel 1260 to sequentially reach the fine mixing stirrer 1242 and the discharging stirrer 1243 and then stay above the conveying mechanism 1400, and waiting for manually or automatically opening the discharging gate 1270 for feeding;
after the discharge valve 1270 is manually opened, the stirred concrete falls into the conveying mechanism 1400, and the conveying mechanism 1400 conveys the concrete to the 3D printer for printing through air pressure or mechanical conveying.
According to the embodiment, the device is used for carrying out fine treatment and conveying of concrete, quantitative addition can be carried out on the concrete, water is quantitatively added according to the weight of the concrete for mixing, and the proportioning precision is improved;
the concrete mixer has multiple stirring functions of coarse stirring, fine stirring, discharging stirring and the like, is beneficial to improving the stirring uniformity, can discharge bubbles in concrete, and improves the quality of slurry;
the degree of automation is high, need not artificial intervention, can extract the concrete automatically and carry out the processing that becomes more meticulous, has improved the treatment effeciency greatly, can avoid the human error that artificial intervention caused, makes the concrete quality of every batch balanced, guarantees the finished product quality after the 3D prints.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the utility model. The scope of the utility model is defined by the appended claims.
Claims (10)
1. A concrete fine processing and conveying device comprises a mounting frame, a material storage barrel, a fine mixing mechanism, a conveying mechanism and a control mechanism, wherein the material storage barrel, the fine mixing mechanism and the conveying mechanism are electrically connected to the control mechanism; the material storage barrel is fixed to the side part of the mounting frame and communicated to the weighing mechanism through a lifting machine, and the weighing mechanism is provided with a feeding gate; the bottom of compounding bucket all is provided with row material gate, conveying mechanism set up in when arbitrary station of rotatory workstation row material gate is under.
2. The concrete refining and conveying device according to claim 1, wherein the rotary worktable comprises a rotating mechanism and a lifting mechanism, the lifting mechanism is mounted on the mounting frame, the rotating mechanism is mounted on the lifting mechanism, the rotating mechanism comprises a rotating disk and a rotating motor, the rotating motor drives the rotating disk to rotate, and the mixing barrel is mounted on the rotating disk.
3. The concrete refining and conveying device according to claim 2, wherein the lifting mechanism comprises a lifting table, a lifting motor and a lifting screw rod, the lifting screw rod is mounted at the bottom of the lifting table, the lifting motor is mounted on the mounting frame, the lifting motor is in threaded connection with the lifting screw rod through a threaded sleeve, the rotating disc is rotatably connected to the lifting table, and the rotating motor is mounted on the lifting table.
4. The concrete refining treatment conveying device according to claim 3, wherein two lifting screw rods are arranged, the two lifting screw rods are symmetrically arranged on two sides of the center of the lifting table, a plurality of guide rods are arranged at the bottom of the lifting table, and the guide rods are vertically arranged and are connected to the mounting frame in a sliding mode.
5. The concrete refining treatment conveying device according to claim 1, wherein the weighing mechanism comprises a weighing frame, a guide cylinder, a dust-proof cylinder and the feeding gate, the bottom of the weighing frame is mounted on the mounting frame through a pressure sensor, the feeding gate is connected to the weighing frame in a sliding mode, a push-pull cylinder is arranged on one side of the feeding gate, the guide cylinder is arranged at the bottom of the weighing frame, and the dust-proof cylinder is arranged above the feeding gate and mounted to an outlet of the hoisting machine.
6. The concrete refining and conveying device according to claim 5, wherein the feeding gate is provided with a push-pull hole, the end of the piston rod of the push-pull cylinder is provided with a vertically arranged push-pull rod, the push-pull rod is inserted into the push-pull hole, and the diameter of the push-pull hole is larger than that of the push-pull rod.
7. The concrete fine-processing conveying device according to claim 1, wherein four mixing barrels are uniformly arranged, the mixing mechanism comprises a rough mixing stirrer, a fine mixing stirrer and a discharging stirrer, a sealing cover is arranged on the top of a stirring blade of the rough mixing stirrer, and the liquid inlet pipe is arranged on the sealing cover.
8. The concrete fine processing and conveying device according to claim 1, wherein a plurality of positioning mechanisms are arranged around the mounting frame, each positioning mechanism comprises a positioning frame, a positioning cylinder and a positioning plate, the positioning frames are mounted on the mounting frame, the positioning cylinders are mounted on the positioning frames and arranged towards the central axis of the rotary worktable, the positioning plates are mounted at the end portions of piston rods of the positioning cylinders, and a plurality of positioning guide rods are arranged on the positioning plates and are connected to the positioning frames in a sliding mode.
9. The concrete refining and conveying device according to claim 2, wherein a discharge opening is formed in the rotary disc at the bottom of the mixing barrel, the discharge gate comprises a gate plate and a rotary handle, the bottom of the rotary handle is fixed to the gate plate, the rotary handle is rotatably connected to the rotary disc, a reinforcing groove is formed in the edge of the discharge opening, and the gate plate is slidably connected to the reinforcing groove.
10. The concrete refining treatment conveying device according to claim 1, wherein the two sides of the mounting rack are provided with object placing tables, the control mechanism and the material storage barrel are mounted on the object placing tables, and four corners of the bottom of the mounting rack are provided with universal wheels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120237432.XU CN215903766U (en) | 2021-01-28 | 2021-01-28 | Concrete fine treatment conveying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120237432.XU CN215903766U (en) | 2021-01-28 | 2021-01-28 | Concrete fine treatment conveying device |
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| Publication Number | Publication Date |
|---|---|
| CN215903766U true CN215903766U (en) | 2022-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120237432.XU Active CN215903766U (en) | 2021-01-28 | 2021-01-28 | Concrete fine treatment conveying device |
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| CN (1) | CN215903766U (en) |
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2021
- 2021-01-28 CN CN202120237432.XU patent/CN215903766U/en active Active
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