CN214242981U - Four-guide rail lifting upright post mechanism of car unloader - Google Patents
Four-guide rail lifting upright post mechanism of car unloader Download PDFInfo
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- CN214242981U CN214242981U CN202120227506.1U CN202120227506U CN214242981U CN 214242981 U CN214242981 U CN 214242981U CN 202120227506 U CN202120227506 U CN 202120227506U CN 214242981 U CN214242981 U CN 214242981U
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Abstract
The utility model relates to a four guide rail lifting column mechanisms of car unloader belongs to the gondola car technical field that unloads. For solving the poor problem of current frame during operation stability of unloading, the utility model provides a four guide rail lift stand mechanisms of unloader, four lift stand hoist and mount in the base angle department of last platform, and the upper platform is connected with the unloader main part, and equal slidable mounting has spiral crossbeam between the lift stand, installs guider on each spiral crossbeam's the both ends side, and spiral crossbeam passes through guider and lift stand cooperation realization and reciprocates, and each lift stand includes: a stand main part and two guide rails, stand main part are character cut in bas-relief structure, and two guide rail mutual dispositions are on character cut in bas-relief structure's inside wall, and each guider includes: the base is arranged at the end part of the spiral beam, and the sliding block lining plate is arranged on the base. The utility model discloses a change the structure of lift stand and change guide rail and guider's installation form, promote crane intensity, stability.
Description
Technical Field
The utility model belongs to the technical field of the uncovered car unloads, especially, relate to a four guide rail lifting column mechanisms of car unloader.
Background
With the development and wide application of mechanical equipment in industries such as thermal power plants, chemical industry, coal, metallurgy and the like, after the materials are transported into a plant, when the materials are unloaded from a truck unloader of an open wagon, the vibration is large, the noise is large, the main structure is deformed, the working head swings, and even the working head falls off, so that the equipment cannot work normally, the unloading efficiency is influenced, and even more, safety accidents can occur possibly, and personal safety and other problems are caused.
SUMMERY OF THE UTILITY MODEL
For solving the above-mentioned current problem of unloading frame during operation poor stability, the utility model provides a four guide rail lift stand mechanisms of unloader.
The technical scheme of the utility model:
the utility model provides a four guide rail lift post mechanisms of car unloader, includes four lift stands and two spiral crossbeams, four lift stand hoists in four base angle departments of upper mounting plate, the upper mounting plate is connected with the main part of car unloader, and equal slidable mounting has a spiral crossbeam between two lift stands of front side and two lift stands on right side, all installs guider on every spiral crossbeam's both ends side, and spiral crossbeam passes through guider and lift stand cooperation and realizes reciprocating, every the lift stand includes: a stand main part and two guide rails, stand main part are character cut in bas-relief structure, and two guide rail mutual dispositions are on character cut in bas-relief structure's inside wall, and every guider includes: the base is arranged on the side face of the end portion of the spiral cross beam, a groove is formed in the base, a slider lining plate is detachably arranged in the groove, and the slider lining plate is matched with the guide rail.
Preferably, the guide rail includes: fixed guide and movable guide, fixed guide and movable guide from top to bottom end to end form a complete guide rail structure, fixed guide passes through welded fastening on the lateral wall of stand main part, movable guide passes through connecting bolt to be fixed on the lateral wall of stand main part.
Preferably, the guide device further comprises: and the base is fixedly connected with the top end of the sliding block lining plate through a gland.
Preferably, two guiding devices are mounted on the side faces of two ends of each spiral cross beam.
The utility model has the advantages that:
1. the utility model discloses the upper platform is connected with the equipment main part, and the lift stand hoist and mount is plane under the upper platform, and guider installs on spiral crossbeam, and spiral crossbeam passes through elevating gear and drives, makes guider reciprocate along the stand guide rail. The rigidity of the lifting upright post is enhanced by changing the structure of the lifting upright post, and the phenomena of large vibration and main structure deformation of the unloader during working are improved; the problems of large working head swing, high noise and working head falling are solved by changing the installation forms of the guide rail and the guide device and increasing the number of the guide rail and the guide device; through optimizing the original structure of guider, promote its intensity, rigidity, avoid therefore the damage of piece to lead to the unable normal work of equipment, influence the efficiency of unloading, the accident may take place even more, cause personal safety scheduling problem.
2. The utility model discloses a have two guide rails on every lift stand, every guide rail comprises a fixed guide and a movable guide. The fixed guide rail is welded and fixed with the side plate of the lifting upright post main body, and the movable guide rail is fixed with the lifting upright post main body through a connecting bolt. The double guide rails are arranged on the side faces of the stand columns, so that the original single guide rail mounting positions are changed, the rigidity of the stand column main body and the stability of equipment operation are improved, and the problems that a cross beam and a working head fall off and the main body deforms due to the damage of the guide rails can be avoided.
3. The utility model discloses guider includes: base and slider welt. The base is arranged on the side surfaces of the two ends of the cross beam, and the sliding block lining plate can be quickly replaced after being worn, so that the maintenance is convenient. The problems of large equipment vibration, large working head swing and noise can be reduced by the matching installation form of the multiple groups of guide devices and the guide rails. Through optimizing the original structure of guider, guider is changed into whole machined part by the assembly welding spare, promotes its intensity, avoids therefore the damage of piece to lead to the unable work of equipment to influence the unloading.
4. The utility model discloses gland fixed connection is passed through on base and slider welt top, and the accessible gland is further fixed slider welt and base, stability when improve equipment operation.
5. The utility model discloses four sets of lift stands of every unloader installation are in the upper mounting plate below, and every two sets of lift stands correspond one set of spiral crossbeam, are equipped with eight guider on every set of spiral crossbeam, are equipped with two guide rails on every set of lift stand, and the guide rail forms mutually supporting with guider to guarantee spiral crossbeam and install the spiral discharge apparatus who carries out work at fixed position under spiral crossbeam.
Drawings
FIG. 1 is an assembly schematic diagram of a four-rail lifting column mechanism of a car unloader in the car unloader;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is a schematic view of the assembly of the lifting column, guide and spiral beam;
FIG. 4 is a schematic structural view of the lifting column;
FIG. 5 is a front view of the lifting column;
FIG. 6 is a cross-sectional view taken along line A-A of FIG. 5;
FIG. 7 is a bottom view of FIG. 5;
FIG. 8 is a schematic view of the structure of the guide device;
in the figure: 1. a lifting transmission mechanism; 2. an upper platform; 3. lifting the upright post; 3-1, a column main body; 3-2, fixing a guide rail; 3-3, a movable guide rail; 3-1 connecting bolt; 4. a guide device; 4-1, a base; 4-2, a sliding block lining plate; 4-3, pressing a cover; 5. a spiral beam; 6. a spiral discharging device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described below with reference to specific embodiments shown in the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The first embodiment is as follows: the present embodiment is described with reference to fig. 1 to 8, and in order to solve the problem of poor stability of the conventional unloading frame, the present embodiment proposes the following technical solutions:
the utility model provides a four guide rail lifting column mechanisms of car unloader, includes: the lifting device comprises a lifting transmission mechanism 1, an upper platform 2, lifting upright posts 3, a guide device 4 and spiral cross beams 5, wherein the upper platform 2 is connected with a main body of the car unloader, each car unloader is provided with four sets of lifting upright posts 3 below the upper platform, each two sets of lifting upright posts 3 correspond to one set of spiral cross beam 5, each set of spiral cross beam 5 is provided with eight sets of guide devices 4, each set of lifting upright post 3 is provided with two guide rails which are matched with the guide devices 4, each spiral cross beam 5 is provided with one set of lifting transmission mechanism 1, the lifting transmission mechanisms 1 are fixedly arranged at the upper end of the upper platform 2, the lifting transmission mechanisms 1 are connected with two sides of the spiral cross beam through chains and control the spiral cross beam 5 to move up and down along the guide rails, the lower end of the spiral cross beam 5 is connected with a spiral discharging device 6, so that the spiral cross beam 5 and the spiral discharging device 6 arranged below the spiral cross beam 5 are ensured to work at fixed positions, as shown in fig. 1 and 2. Each of the lifting columns 3 comprises: the upright post comprises an upright post main body 3-1 and two guide rails, wherein the upright post main body 3-1 is of a concave structure, the two guide rails are oppositely arranged on the inner side wall of the concave structure, and the guide rails comprise: the guide rail structure comprises a fixed guide rail 3-2 and a movable guide rail 3-3, wherein the fixed guide rail 3-2 and the movable guide rail 3-3 are connected end to end from top to bottom to form a complete guide rail structure, the fixed guide rail 3-2 is fixed on the side wall of the upright post main body 3-1 through welding, and the movable guide rail 3-3 is fixed on the side wall of the upright post main body 3-1 through a connecting bolt 3-4, as shown in fig. 3 to 7. Each guide means 4 comprises: the sliding block type guide rail device comprises a base 4-1, a sliding block lining plate 4-2 and a gland 4-3, wherein the base 4-1 is installed on the side face of the end part of a spiral cross beam 5, a groove is formed in the base 4-1, the sliding block lining plate 4-2 is detachably installed in the groove, the sliding block lining plate 4-2 is matched with a guide rail, and the top ends of the base 4-1 and the sliding block lining plate 4-2 are fixedly connected through the gland 4-3 as shown in figure 8.
When the lifting device works, the upper platform 2 is connected with the main body of the car unloader, the lifting transmission mechanism 1 is started, the spiral cross beam 5 is driven by the lifting transmission mechanism 1 to move up and down along the lifting upright post 3, and the spiral discharging device 6 arranged below the spiral cross beam 5 is fixed at a required position.
The utility model improves the rigidity of the lifting upright post 3 by changing the structure thereof, and improves the phenomena of large vibration and main structure deformation of the unloader during working; the problems of large working head swing, large noise and working head falling are solved by changing the installation form of the guide rail and the guide device 4 and increasing the number of the guide rail and the guide device; through optimizing the original structure of guider 4, promote its intensity, rigidity, avoid therefore the damage of piece to lead to the unable normal work of equipment, influence the efficiency of unloading, the accident probably takes place even more, causes personal safety scheduling problem. Four sets of lifting upright columns 3 are arranged below the upper platform 2 on each unloading machine, each set of lifting upright columns 3 corresponds to one set of spiral cross beam 5, eight sets of guide devices 4 are arranged on each set of spiral cross beam 5, two guide rails are arranged on each set of lifting upright column 3, and the guide rails and the guide devices 4 are matched with each other, so that the spiral cross beams 5 and the spiral unloading devices 6 arranged below the spiral cross beams 5 are ensured to work at fixed positions.
The utility model discloses a have two guide rails on every lift stand, every guide rail comprises a fixed guide rail 3-2 and a movable guide rail 3-3. The double guide rails are arranged on the side faces of the stand columns, so that the original single guide rail mounting positions are changed, the rigidity of the stand column main body and the stability of equipment operation are improved, and the problems that a cross beam and a working head fall off and the main body deforms due to the damage of the guide rails can be avoided.
The sliding block lining plate 4-2 of the guide device 4 can be quickly replaced after being worn, and the maintenance is convenient. The problems of large equipment vibration, large working head swing and noise can be reduced by the matching installation form of the plurality of groups of guide devices 4 and the guide rails. Through optimizing the original structure of guider 4, promote its intensity, avoid therefore the damage of piece to lead to the unable work of equipment to influence the unloading. The top ends of the base 4-1 and the sliding block lining plate 4-2 are fixedly connected through the gland 4-3, and the sliding block lining plate 4-2 and the base 4-1 can be further fixed through the gland 4-3, so that the stability of the equipment during operation is improved.
The second embodiment is as follows: in order to solve the problem of poor stability of the existing unloading rack, the embodiment provides the following technical scheme:
the utility model provides a four guide rail lifting column mechanisms of car unloader, includes: a lifting transmission mechanism 1, an upper platform 2, a lifting upright post 3, a guiding device 4 and a spiral beam 5, the upper platform 2 is connected with the main body of the car unloader, each car unloader is provided with four sets of lifting upright posts 3 below the upper platform, each set of lifting upright posts 3 corresponds to one set of spiral cross beam 5, each set of spiral cross beam 5 is provided with eight sets of guiding devices 4, each set of lifting upright post 3 is provided with two guide rails, the guide rails are matched with the guiding devices 4, each spiral cross beam 5 is provided with one set of lifting transmission mechanism 1, the lifting transmission mechanism 1 is fixedly arranged at the upper end of the upper platform 2, the lifting transmission mechanism 1 is connected with two sides of the spiral beam through chains and controls the spiral beam 5 to move up and down along the guide rail, the lower end of the spiral beam 5 is connected with the spiral discharging device 6, thereby ensuring that the spiral beam 5 and the spiral discharging device 6 arranged below the spiral beam 5 work at a fixed position. Each of the lifting columns 3 comprises: the upright post comprises an upright post main body 3-1 and two guide rails, wherein the upright post main body 3-1 is of a concave structure, the two guide rails are oppositely arranged on the inner side wall of the concave structure, and the guide rails comprise: the guide rail comprises a fixed guide rail 3-2 and a movable guide rail 3-3, wherein the fixed guide rail 3-2 and the movable guide rail 3-3 are connected end to end from top to bottom to form a complete guide rail structure, the fixed guide rail 3-2 is fixed on the side wall of the upright main body 3-1 through welding, and the movable guide rail 3-3 is fixed on the side wall of the upright main body 3-1 through a connecting bolt 3-4. Each guide means 4 comprises: the base 4-1 and the slide block lining plate 4-2, the base 4-1 is installed on the side face of the end part of the spiral cross beam 5, the base 4-1 is provided with a groove, the slide block lining plate 4-2 is detachably installed in the groove, and the slide block lining plate 4-2 is matched with the guide rail.
When the lifting device works, the upper platform 2 is connected with the main body of the car unloader, the lifting transmission mechanism 1 is started, the spiral cross beam 5 is driven by the lifting transmission mechanism 1 to move up and down along the lifting upright post 3, and the spiral discharging device 6 arranged below the spiral cross beam 5 is fixed at a required position.
The utility model improves the rigidity of the lifting upright post 3 by changing the structure thereof, and improves the phenomena of large vibration and main structure deformation of the unloader during working; the problems of large working head swing, large noise and working head falling are solved by changing the installation form of the guide rail and the guide device 4 and increasing the number of the guide rail and the guide device; through optimizing the original structure of guider 4, promote its intensity, rigidity, avoid therefore the damage of piece to lead to the unable normal work of equipment, influence the efficiency of unloading, the accident probably takes place even more, causes personal safety scheduling problem. Four sets of lifting upright columns 3 are arranged below the upper platform 2 on each unloading machine, each set of lifting upright columns 3 corresponds to one set of spiral cross beam 5, eight sets of guide devices 4 are arranged on each set of spiral cross beam 5, two guide rails are arranged on each set of lifting upright column 3, and the guide rails and the guide devices 4 are matched with each other, so that the spiral cross beams 5 and the spiral unloading devices 6 arranged below the spiral cross beams 5 are ensured to work at fixed positions.
The utility model discloses a have two guide rails on every lift stand, every guide rail comprises a fixed guide rail 3-2 and a movable guide rail 3-3. The double guide rails are arranged on the side faces of the stand columns, so that the original single guide rail mounting positions are changed, the rigidity of the stand column main body and the stability of equipment operation are improved, and the problems that a cross beam and a working head fall off and the main body deforms due to the damage of the guide rails can be avoided.
The sliding block lining plate 4-2 of the guide device 4 can be quickly replaced after being worn, and the maintenance is convenient. The problems of large equipment vibration, large working head swing and noise can be reduced by the matching installation form of the plurality of groups of guide devices 4 and the guide rails. Through optimizing the original structure of guider 4, promote its intensity, avoid therefore the damage of piece to lead to the unable work of equipment to influence the unloading.
The third concrete implementation mode: in order to solve the problem of poor stability of the existing unloading rack, the embodiment provides the following technical scheme:
the utility model provides a four guide rail lifting column mechanisms of car unloader, includes: a lifting transmission mechanism 1, an upper platform 2, a lifting upright post 3, a guiding device 4 and a spiral beam 5, the upper platform 2 is connected with the main body of the car unloader, each car unloader is provided with four sets of lifting upright posts 3 below the upper platform, each set of lifting upright posts 3 corresponds to one set of spiral cross beam 5, each set of spiral cross beam 5 is provided with eight sets of guiding devices 4, each set of lifting upright post 3 is provided with two guide rails, the guide rails are matched with the guiding devices 4, each spiral cross beam 5 is provided with one set of lifting transmission mechanism 1, the lifting transmission mechanism 1 is fixedly arranged at the upper end of the upper platform 2, the lifting transmission mechanism 1 is connected with two sides of the spiral beam through chains and controls the spiral beam 5 to move up and down along the guide rail, the lower end of the spiral beam 5 is connected with the spiral discharging device 6, thereby ensuring that the spiral beam 5 and the spiral discharging device 6 arranged below the spiral beam 5 work at a fixed position. Each of the lifting columns 3 comprises: a stand main part 3-1 and two guide rails, stand main part 3-1 is character cut in bas-relief structure, and two guide rails relative arrangement are on character cut in bas-relief structure's inside wall, and every guider 4 includes: the base 4-1 and the slide block lining plate 4-2, the base 4-1 is installed on the side face of the end part of the spiral cross beam 5, the base 4-1 is provided with a groove, the slide block lining plate 4-2 is detachably installed in the groove, and the slide block lining plate 4-2 is matched with the guide rail.
When the lifting device works, the upper platform 2 is connected with the main body of the car unloader, the lifting transmission mechanism 1 is started, the spiral cross beam 5 is driven by the lifting transmission mechanism 1 to move up and down along the lifting upright post 3, and the spiral discharging device 6 arranged below the spiral cross beam 5 is fixed at a required position.
The utility model improves the rigidity of the lifting upright post 3 by changing the structure thereof, and improves the phenomena of large vibration and main structure deformation of the unloader during working; the problems of large working head swing, large noise and working head falling are solved by changing the installation form of the guide rail and the guide device 4 and increasing the number of the guide rail and the guide device; through optimizing the original structure of guider 4, promote its intensity, rigidity, avoid therefore the damage of piece to lead to the unable normal work of equipment, influence the efficiency of unloading, the accident probably takes place even more, causes personal safety scheduling problem. Four sets of lifting upright columns 3 are arranged below the upper platform 2 on each unloading machine, each set of lifting upright columns 3 corresponds to one set of spiral cross beam 5, eight sets of guide devices 4 are arranged on each set of spiral cross beam 5, two guide rails are arranged on each set of lifting upright column 3, and the guide rails and the guide devices 4 are matched with each other, so that the spiral cross beams 5 and the spiral unloading devices 6 arranged below the spiral cross beams 5 are ensured to work at fixed positions.
The sliding block lining plate 4-2 of the guide device 4 can be quickly replaced after being worn, and the maintenance is convenient. The problems of large equipment vibration, large working head swing and noise can be reduced by the matching installation form of the plurality of groups of guide devices 4 and the guide rails. Through optimizing the original structure of guider 4, promote its intensity, avoid therefore the damage of piece to lead to the unable work of equipment to influence the unloading.
The fourth concrete implementation mode: in order to solve the problem of poor stability of the existing unloading rack, the embodiment provides the following technical scheme:
the utility model provides a four guide rail lifting column mechanisms of car unloader, includes four lifting column 3 and two spiral crossbeam 5, four lifting column 3 hoist and mount in four base angle departments of upper mounting plate 2, upper mounting plate 2 is connected with the main part of car unloader, and equal slidable mounting has a spiral crossbeam 5 between two lifting column 3 of front side and two lifting column 3 on right side, all installs guider 4 on the both ends side of every spiral crossbeam 5, and spiral crossbeam 5 realizes reciprocating, every through guider 4 and 3 cooperations of lifting column 3 lifting column 3 lift column 3 includes: a stand main part 3-1 and two guide rails, stand main part 3-1 is character cut in bas-relief structure, and two guide rails relative arrangement are on character cut in bas-relief structure's inside wall, and every guider 4 includes: the base 4-1 and the slide block lining plate 4-2, the base 4-1 is installed on the side face of the end part of the spiral cross beam 5, the base 4-1 is provided with a groove, the slide block lining plate 4-2 is detachably installed in the groove, and the slide block lining plate 4-2 is matched with the guide rail.
When the lifting device works, the upper platform 2 is connected with the main body of the car unloader, the lifting transmission mechanism 1 is started, the spiral cross beam 5 is driven by the lifting transmission mechanism 1 to move up and down along the lifting upright post 3, and the spiral discharging device 6 arranged below the spiral cross beam 5 is fixed at a required position.
The utility model improves the rigidity of the lifting upright post 3 by changing the structure thereof, and improves the phenomena of large vibration and main structure deformation of the unloader during working; the problems of large working head swing, large noise and working head falling are solved by changing the installation form of the guide rail and the guide device 4 and increasing the number of the guide rail and the guide device; through optimizing the original structure of guider 4, promote its intensity, rigidity, avoid therefore the damage of piece to lead to the unable normal work of equipment, influence the efficiency of unloading, the accident probably takes place even more, causes personal safety scheduling problem. Four sets of lifting upright columns 3 are arranged below the upper platform 2 on each unloading machine, each set of lifting upright columns 3 corresponds to one set of spiral cross beam 5, eight sets of guide devices 4 are arranged on each set of spiral cross beam 5, two guide rails are arranged on each set of lifting upright column 3, and the guide rails and the guide devices 4 are matched with each other, so that the spiral cross beams 5 and the spiral unloading devices 6 arranged below the spiral cross beams 5 are ensured to work at fixed positions.
Claims (4)
1. The utility model provides a four guide rail lifting column mechanisms of car unloader, includes four lifting column (3) and two spiral crossbeam (5), four lifting column (3) hoist and mount in four base angle departments of upper mounting plate (2), upper mounting plate (2) are connected with the main part of car unloader, and equal slidable mounting has one spiral crossbeam (5) between two lifting column (3) of front side and two lifting column (3) on right side, all installs guider (4) on the both ends side of every spiral crossbeam (5), and spiral crossbeam (5) realize reciprocating through guider (4) and lifting column (3) cooperation, its characterized in that, every lifting column (3) include: a stand main part (3-1) and two guide rails, stand main part (3-1) are character cut in bas-relief structure, and two guide rails are arranged relatively on the inside wall of character cut in bas-relief structure, and every guider (4) includes: the sliding block type guide rail device comprises a base (4-1) and a sliding block lining plate (4-2), wherein the base (4-1) is installed on the side face of the end part of a spiral cross beam (5), a groove is formed in the base (4-1), the sliding block lining plate (4-2) is detachably installed in the groove, and the sliding block lining plate (4-2) is matched with a guide rail.
2. The four-rail lifting column mechanism of the car unloader as claimed in claim 1, wherein the rail comprises: fixed guide (3-2) and movable guide (3-3), fixed guide (3-2) and movable guide (3-3) from top to bottom connect end to end and form a complete guide rail structure, fixed guide (3-2) are through welded fastening on the lateral wall of stand main part (3-1), movable guide (3-3) are fixed on the lateral wall of stand main part (3-1) through connecting bolt (3-4).
3. The four-rail lifting column mechanism of the car unloader as recited in claim 1 or 2, wherein the guiding device (4) further comprises: the base (4-1) is fixedly connected with the top end of the sliding block lining plate (4-2) through the gland (4-3).
4. The four-rail lifting column mechanism of the car unloader as claimed in claim 3, wherein two guiding devices (4) are mounted on the side surfaces of both ends of each spiral beam (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120227506.1U CN214242981U (en) | 2021-01-27 | 2021-01-27 | Four-guide rail lifting upright post mechanism of car unloader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120227506.1U CN214242981U (en) | 2021-01-27 | 2021-01-27 | Four-guide rail lifting upright post mechanism of car unloader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214242981U true CN214242981U (en) | 2021-09-21 |
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ID=77794797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120227506.1U Active CN214242981U (en) | 2021-01-27 | 2021-01-27 | Four-guide rail lifting upright post mechanism of car unloader |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214242981U (en) |
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2021
- 2021-01-27 CN CN202120227506.1U patent/CN214242981U/en active Active
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