CN214362137U - Thread trimming and presser foot lifting device of sewing machine - Google Patents
Thread trimming and presser foot lifting device of sewing machine Download PDFInfo
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- CN214362137U CN214362137U CN202120248280.3U CN202120248280U CN214362137U CN 214362137 U CN214362137 U CN 214362137U CN 202120248280 U CN202120248280 U CN 202120248280U CN 214362137 U CN214362137 U CN 214362137U
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Abstract
The utility model belongs to the technical field of sewing equipment, in particular to a thread cutting and presser foot lifting device of a sewing machine; a driving shaft of the driving source is connected with one end of a presser foot lifting and trimming lever through a transmission mechanism, the presser foot lifting and trimming lever is rotatably arranged on the machine shell, the other end of the presser foot lifting and trimming lever is connected with a connecting hole on a trimming driving crank, the trimming driving crank is rotatably arranged on the machine shell, and the other end of the trimming driving crank is connected with a trimming shaft; the presser foot lifting small lever can drive the presser foot arm crank shaft to rotate in one direction and is connected with a presser foot lifting trimming lever through a presser foot lifting lever drag hook; the utility model discloses a driving source realizes lifting presser foot and the drive of trimming action, compact structure, the assembly of being convenient for, reduction in production cost.
Description
The technical field is as follows:
the utility model belongs to the technical field of sewing equipment, refer in particular to a sewing machine's trimming and lift presser foot device.
Background art:
at present, most sewing machines are provided with an automatic presser foot lifting mechanism and an automatic thread trimming mechanism. The utility model discloses a pneumatic type on hemming machine that china utility model patent (grant announcement No. CN 202430450U, grant announcement day 2012.09.12) disclosed lifts presser foot and trimming drive structure, include the trimming cylinder, lift the presser foot cylinder, by the trimming cylinder, lift the presser foot cylinder and drive the trimming respectively, lift the presser foot, have following defect: firstly, the cylinder is used as a power source, an air source is needed, and the noise is high; and two power sources respectively drive the actions of lifting the presser foot and trimming the thread, so that the cost is high, the structure is complex and the assembly is inconvenient.
The invention content is as follows:
the utility model aims at providing a sewing machine's trimming and lift presser foot device compact structure, the assembly of being convenient for.
The utility model discloses a realize like this:
a thread cutting and presser foot lifting device of a sewing machine comprises a driving source, a thread cutting shaft, a moving knife, a presser foot arm crankshaft, a presser foot arm and a presser foot, wherein a driving shaft of the driving source is connected with one end of a presser foot thread cutting lifting lever through a transmission mechanism; the presser foot lifting arm crank shaft is connected with a presser foot lifting small lever, the presser foot lifting small lever can drive the presser foot arm crank shaft to rotate in a single direction, and the presser foot lifting small lever is connected with a presser foot lifting trimming lever through a presser foot lifting lever drag hook; when the presser foot is lifted, a driving shaft of the driving source drives a presser foot lifting and trimming lever to rotate through a transmission mechanism, so that a small presser foot lifting lever is driven to swing downwards to drive a presser foot arm crank shaft to rotate to lift the presser foot, at the moment, the other end of the presser foot lifting and trimming lever performs idle stroke in a connecting hole, and the trimming driving crank does not act; when the thread is cut, the driving shaft of the driving source drives the presser foot lifting thread cutting lever to rotate, so that the thread cutting driving crank is driven to rotate, the thread cutting shaft is driven to rotate to cut the thread, at the moment, the presser foot lifting small lever executes an idle stroke, and the presser foot arm crank shaft does not act.
In the above thread trimming and presser foot lifting device for a sewing machine, the transmission mechanism includes a presser foot and thread trimming lifting driving crank and a joint bearing assembly, one end of the presser foot and thread trimming lifting driving crank is fixedly arranged on a driving shaft of the driving source, the other end of the presser foot and thread trimming lifting driving crank is connected with the upper end of the joint bearing assembly, and the lower end of the joint bearing assembly is connected with one end of a presser foot and thread trimming lifting lever.
In the above thread trimming and presser foot lifting device of a sewing machine, the joint bearing assembly includes an upper joint bearing, a lower joint bearing, and a stud bolt connecting the upper joint bearing and the lower joint bearing.
In the above thread cutting and presser foot lifting device for a sewing machine, the other end of the thread cutting driving crank is indirectly connected to the thread cutting bobbin: the other end of the trimming driving crank is connected with one end of a trimming connecting rod through a trimming connecting rod piece, the other end of the trimming connecting rod is connected with a trimming shaft, and the trimming connecting rod and the trimming shaft synchronously rotate.
In the above thread trimming and presser foot lifting device for a sewing machine, the presser foot lifting and trimming lever is L-shaped, and a corner of the presser foot lifting and trimming lever is rotatably connected to the machine shell.
In the thread trimming and presser foot lifting device of the sewing machine, the presser foot lifting lever pin is inserted into the machine shell, and a corner of the presser foot lifting trimming lever is positioned on the outer end surface of the presser foot lifting lever pin and is rotationally connected with the presser foot lifting lever pin through the shaft position screw.
In the thread trimming and presser foot lifting device of the sewing machine, the first reset torsion spring is sleeved on the presser foot lifting lever pin, one support arm of the first reset torsion spring is inserted on the machine shell, and the other support arm is connected to the presser foot lifting trimming lever.
In the thread trimming and presser foot lifting device of the sewing machine, the presser foot lifting small lever can drive the presser foot arm crank shaft to rotate in one direction: the presser foot arm crank shaft is rotatably installed on the machine shell through a presser foot arm crank shaft sleeve, the presser foot arm crank shaft is further provided with a limiting check ring, the presser foot lifting small lever is axially limited between the limiting check ring and the presser foot arm crank shaft sleeve, a first bulge extends towards one side of the presser foot lifting small lever on the limiting check ring, the presser foot lifting small lever is provided with a second bulge, and when the presser foot lifting small lever rotates and the first bulge is abutted to the second bulge, the presser foot lifting small lever drives the presser foot arm crank shaft to rotate; on the contrary, the first bulge and the second bulge are separated, and the small lever for lifting the presser foot cannot drive the crank shaft of the presser foot arm to rotate.
In the thread trimming and presser foot lifting device of the sewing machine, a second reset torsion spring is sleeved outside the crank shaft sleeve of the presser arm, one end of the second reset torsion spring is connected to the machine shell, and the other end of the second reset torsion spring is connected to the small presser foot lifting lever.
In the thread trimming and presser foot lifting device of the sewing machine, the connecting hole is an arc-shaped hole, an inward convex part is arranged on the arc-shaped hole, an axial position screw is arranged at the other end of the presser foot thread trimming lifting lever and is positioned in the arc-shaped hole, when the presser foot thread trimming lifting lever rotates downwards, the axial position screw acts on the convex part of the arc-shaped hole to drive the thread trimming driving crank to rotate, and when the presser foot thread trimming lifting lever rotates upwards, the axial position screw moves downwards along the arc-shaped hole.
Compared with the prior art, the utility model outstanding advantage is:
1. the utility model discloses a driving source realizes lifting the drive of presser foot and trimming action, compact structure, the assembly of being convenient for, and reduction in production cost lifts presser foot, trimming action mutually noninterfere.
2. The utility model discloses a when the driving source adopted step motor or servo motor, the control of being convenient for, the turned angle who lifts presser foot trimming lever through control controls the height of lifting the presser foot to be applicable to making up of the cloth of different thickness.
Description of the drawings:
fig. 1 is a first perspective view of the present invention;
FIG. 2 is an enlarged schematic view of section A of FIG. 1;
FIG. 3 is a schematic perspective view of the present invention
FIG. 4 is a schematic view of the present invention mounted on a housing;
fig. 5 is a schematic view of the trimming drive crank of the present invention;
fig. 6 is a schematic view of a limit retainer ring of the present invention;
fig. 7 is a schematic view of the presser foot lifting small lever of the present invention.
In the figure: 1. a drive source; 2. a thread cutting shaft; 3. moving a knife; 4. a presser foot arm crank shaft; 5. a presser foot arm; 6. a presser foot; 7. lifting a presser foot trimming lever; 8. a housing; 9. a trimming drive crank; 10. connecting holes; 11. lifting a small lever of the presser foot; 12. lifting the presser foot lever drag hook; 13. mounting a bracket; 14. lifting a presser foot and trimming a driving crank; 15. an upper knuckle bearing; 16. a lower spherical plain bearing; 17. a stud bolt; 18. trimming connecting rods; 19. lifting a lever pin of the presser foot; 20. an axial screw; 21. a first return torsion spring; 22. a crank shaft sleeve of the presser arm; 23. a limit retainer ring; 24. a first protrusion; 25. a second protrusion; 26. a second reset spring; 27. a boss portion; 28. and (5) trimming the connecting rod piece.
The specific implementation mode is as follows:
the invention will now be further described with reference to specific embodiments, with reference to figures 1 to 7:
a thread cutting and presser foot lifting device of a sewing machine comprises a driving source 1, a thread cutting shaft 2, a moving blade 3, a presser foot arm crankshaft 4, a presser foot arm 5 and a presser foot 6, wherein a driving shaft of the driving source 1 is connected with one end of a presser foot lifting and thread cutting lever 7 through a transmission mechanism, the presser foot lifting and thread cutting lever 7 is rotatably installed on a machine shell 8, as shown in figures 1, 3 and 4, the presser foot lifting and thread cutting lever 7 of the embodiment is L-shaped, and the corner of the presser foot lifting and thread cutting lever is rotatably connected on the machine shell 8. The L-shaped structure can reduce the requirement on the force of the driving source 1, saves more labor and is convenient for controlling the height of the pressure foot. The other end of the presser foot thread trimming lifting lever 7 is connected with a connecting hole 10 on a thread trimming driving crank 9, the thread trimming driving crank 9 is rotatably installed on the machine shell 8, the other end of the thread trimming driving crank 9 is directly or indirectly connected with the thread trimming shaft 2, the thread trimming driving crank 9 of the embodiment is in an inverted V shape, and the corner of the thread trimming driving crank 9 is rotatably installed on the machine shell 8; the presser foot lifting arm crank shaft 4 is connected with a presser foot lifting small lever 11, the presser foot lifting small lever 11 can drive the presser foot arm crank shaft 4 to rotate in one direction, the presser foot lifting small lever 11 is connected with a presser foot lifting trimming lever 7 through a presser foot lifting lever drag hook 12, and the driving source 1 is fixedly arranged on the machine shell 8 through a mounting bracket 13.
The following takes the case that the presser foot lifting and thread cutting lever 7 rotates the presser foot downwards and cuts thread upwards as an example, and briefly describes the working principle as follows:
when a driving shaft of the driving source 1 drives a presser foot lifting and trimming lever 7 to rotate downwards through a transmission mechanism, a presser foot lifting small lever 11 is driven to swing downwards to drive a presser foot arm crankshaft 4 to rotate so as to lift a presser foot, at the moment, the other end of the presser foot lifting and trimming lever 7 executes idle stroke in a connecting hole 10, a trimming driving crank 9 does not act, a trimming shaft 2 does not rotate, and trimming is not carried out;
when the driving shaft of the driving source 1 drives the presser foot lifting and trimming lever 7 to rotate upwards, the trimming driving crank 9 is driven to rotate so as to drive the trimming shaft 2 to rotate so as to drive the movable knife 3 to act and match with the fixed knife to trim wires, at the moment, the presser foot lifting small lever 11 can drive the presser foot arm crank shaft 4 to rotate in one direction, the presser foot lifting small lever 11 rotates upwards, but the presser foot arm crank shaft 4 does not act, and the presser foot is not lifted.
The utility model discloses also can switch into and lift presser foot trimming lever 7 and rotate the trimming downwards, upwards rotate and lift the presser foot, specifically set up according to the actual production condition.
The utility model discloses a motion of presser foot and trimming is lifted in the drive respectively of a driving source 1, compact structure, the assembly of being convenient for, reduction in production cost lift presser foot, trimming action mutually noninterfere. The driving source 1 adopts a motor or a bidirectional cylinder, a stepping motor is preferably selected in the embodiment, the control is convenient, the height of the presser foot is controlled by controlling the rotation angle of the presser foot lifting and trimming lever 7, and the sewing machine is suitable for sewing cloth with different thicknesses.
As shown in fig. 1 and 5, the connection hole 10 is an arc hole, an inward protrusion 27 is provided on the arc hole, an axial screw is provided at the other end of the pressure foot lifting and trimming lever 7, the axial screw is located in the arc hole, when the pressure foot lifting and trimming lever 7 rotates downward, the axial screw acts on the protrusion 27 of the arc hole to drive the trimming drive crank 9 to rotate, and when the pressure foot lifting and trimming lever 7 rotates upward, the axial screw moves downward along the arc hole, and the trimming drive crank 9 does not operate.
The utility model discloses a connecting hole 10 also can adopt the circular port, the position and the size of circular port are set for according to actual conditions, under the original condition, lift the position of axle screw on the other end of presser foot trimming lever 7 and be the corresponding edge of circular port, when lifting presser foot trimming lever 7 and rotate downwards, drive trimming drive crank 9 and rotate, when lifting presser foot trimming lever 7 and upwards rotate, lift the position of axle screw on the other end of presser foot trimming lever 7 and rotate inside the circular port, do not take place to interfere with trimming drive crank 9.
As shown in fig. 3 and 4, the transmission mechanism includes a presser foot lifting and trimming driving crank 14 and a joint bearing assembly, one end of the presser foot lifting and trimming driving crank 14 is fixedly arranged on the driving shaft of the driving source 1, the other end of the presser foot lifting and trimming driving crank is connected with the upper end of the joint bearing assembly, the lower end of the joint bearing assembly is connected with one end of the presser foot lifting and trimming lever 7, the driving shaft of the driving source 1 rotates clockwise or counterclockwise to drive the presser foot lifting and trimming driving crank 14 to rotate upwards or downwards, and then the presser foot lifting and trimming lever 7 rotates upwards or downwards.
In this embodiment, the joint bearing assembly includes an upper joint bearing 15, a lower joint bearing 16, and a stud bolt 17 connecting the upper joint bearing 15 and the lower joint bearing 16. The stud 17 allows the length of the entire joint bearing assembly to be adjusted to the actual situation. The corresponding drive source 1 is horizontally disposed.
The drive source 1 may be arranged vertically, and in this case, the drive shaft on which the drive source 1 is arranged faces downward. It is also possible to provide a cam for driving the presser foot lifting and trimming lever 7 to rotate upward or downward on the drive shaft of the drive source 1. The utility model discloses preferred joint bearing assembly's structure.
As shown in fig. 1 and 4, the other end of the trimming driving crank 9 is indirectly connected to the trimming shaft 2: the other end of the trimming driving crank 9 is connected with one end of the trimming connecting rod 18 through the trimming connecting rod piece 28, the other end of the trimming connecting rod 18 is connected with the trimming shaft 2, and the trimming connecting rod 18 and the trimming shaft 2 rotate synchronously. In this embodiment, one end of the thread trimming shaft 2 is provided with a spline portion, and the corresponding thread trimming connecting rod 18 is provided with a spline hole.
When the other end of the trimming driving crank 9 is directly connected with the trimming shaft 2, the other end of the trimming driving crank 9 is fixedly arranged on the trimming shaft 2, and the size of the trimming driving crank 9 is adjusted according to actual conditions.
As shown in fig. 1 and 3, a presser foot lifting lever pin 19 is inserted into the housing 8, and a corner of the presser foot lifting trimming lever 7 is located on an outer end surface of the presser foot lifting lever pin 19 and is rotatably connected to the presser foot lifting lever pin 19 by a shaft screw 20.
In order to realize the automatic reset of the presser foot lifting and trimming lever 7, a first reset torsion spring 21 is sleeved on the presser foot lifting and trimming lever pin 19, one arm of the first reset torsion spring 21 is inserted on the machine shell 8, and the other arm is connected to the presser foot lifting and trimming lever 7, specifically to the bottom surface of the presser foot lifting and trimming lever 7.
As shown in fig. 1, 2, 6 and 7, the presser foot lifting small lever 11 can drive the presser foot arm crank shaft 4 to rotate in one direction: the presser foot arm crank shaft 4 is rotatably installed on the machine shell 8 through a presser foot arm crank shaft sleeve 22, a limit retainer ring 23 is fixedly arranged on the presser foot arm crank shaft 4, the presser foot lifting small lever 11 is axially limited between the limit retainer ring 23 and the presser foot arm crank shaft sleeve 22 along the presser foot arm crank shaft 4, a first bulge 24 extends from one side of the limit retainer ring 23, the presser foot lifting small lever 11 upwards extends to form a second bulge 25, when the presser foot lifting small lever 11 downwards rotates, the rear side surface of the first bulge 24 is abutted with the front side surface of the second bulge 25, the first bulge 24 acts on the second bulge 25 to realize that the presser foot lifting small lever 11 drives the limit retainer ring 23 and the presser foot arm crank shaft 4 to rotate, otherwise, the first bulge 24 is separated from the second bulge 25, the presser foot lifting small lever 11 automatically rotates, and the limit retainer ring 23 does not act, presser foot arm crank shaft 4 does not rotate either. The positions of the first bulge 24 and the second bulge 25 are arranged according to the downward rotation and the upward rotation of the presser foot lifting and trimming lever 7.
As another embodiment in which the presser foot lifting small lever 11 can drive the presser foot arm crank shaft 4 to rotate in one direction, a one-way bearing may be provided between the presser foot lifting small lever 11 and the presser foot arm crank shaft 4. When the presser foot lifting small lever 11 rotates downwards, the presser foot arm crankshaft 4 rotates synchronously with the presser foot lifting small lever 11 under the action of the one-way bearing, and when the presser foot lifting small lever 11 rotates upwards, the presser foot arm crankshaft 4 does not rotate.
In order to reset the pressure lifting pin small lever 11, a second reset spring 26 is sleeved outside the pressure arm crankshaft sleeve 22, one end of the second reset spring 26 is connected to the machine shell 8, and the other end of the second reset spring 26 is connected to the pressure lifting pin small lever 11.
The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so: all equivalent changes made according to the shape, structure and principle of the utility model are covered within the protection scope of the utility model.
Claims (10)
1. The utility model provides a sewing machine's trimming and lift presser foot device, includes driving source (1), thread trimming axle (2), moves sword (3), presser foot arm crank axle (4), presser foot arm (5) and presser foot (6), its characterized in that: a driving shaft of the driving source (1) is connected with one end of a presser foot lifting and trimming lever (7) through a transmission mechanism, the presser foot lifting and trimming lever (7) is rotatably arranged on a machine shell (8), the other end of the presser foot lifting and trimming lever (7) is connected with a connecting hole (10) on a trimming driving crank (9), the trimming driving crank (9) is rotatably arranged on the machine shell (8), and the other end of the trimming driving crank (9) is directly or indirectly connected with a trimming shaft (2); the presser foot lifting arm crank shaft (4) is connected with a presser foot lifting small lever (11), the presser foot lifting small lever (11) can drive the presser foot arm crank shaft (4) to rotate in a single direction, and the presser foot lifting small lever (11) is connected with a presser foot lifting trimming lever (7) through a presser foot lifting lever drag hook (12); when the presser foot is lifted, a driving shaft of the driving source (1) drives a presser foot lifting and trimming lever (7) to rotate through a transmission mechanism, and further drives a presser foot lifting small lever (11) to swing to drive a presser foot arm crank shaft (4) to rotate, at the moment, the other end of the presser foot lifting and trimming lever (7) executes idle stroke in a connecting hole (10), and the trimming driving crank (9) does not act; when the thread is cut, the driving shaft of the driving source (1) drives the presser foot lifting and thread cutting lever (7) to rotate, further drives the thread cutting driving crank (9) to rotate, further drives the thread cutting shaft (2) to rotate for cutting the thread, at the moment, the presser foot lifting small lever (11) executes an idle stroke, and the presser foot arm crank shaft (4) does not act.
2. The thread trimming and presser foot lifting device of a sewing machine according to claim 1, wherein: the transmission mechanism comprises a presser foot lifting and trimming drive crank (14) and a joint bearing assembly, one end of the presser foot lifting and trimming drive crank (14) is fixedly arranged on a drive shaft of the drive source (1), the other end of the presser foot lifting and trimming drive crank is connected with the upper end of the joint bearing assembly, and the lower end of the joint bearing assembly is connected with one end of a presser foot lifting and trimming lever (7).
3. The thread trimming and presser foot lifting device of a sewing machine according to claim 2, wherein: the joint bearing assembly comprises an upper joint bearing (15), a lower joint bearing (16) and a stud bolt (17) connected with the upper joint bearing (15) and the lower joint bearing (16).
4. The thread trimming and presser foot lifting device of a sewing machine according to claim 1, wherein: the other end of the trimming driving crank (9) is indirectly connected with the trimming shaft (2) by: the other end of the trimming driving crank (9) is connected with one end of the trimming connecting rod (18) through the trimming connecting rod piece (28), the other end of the trimming connecting rod (18) is connected with the trimming shaft (2), and the trimming connecting rod (18) and the trimming shaft (2) rotate synchronously.
5. The thread trimming and presser foot lifting device of a sewing machine according to claim 1, wherein: the pressure foot lifting and trimming lever (7) is L-shaped, and the corner of the pressure foot lifting and trimming lever is rotatably connected to the machine shell (8).
6. The thread trimming and presser foot lifting device of a sewing machine according to claim 5, wherein: a presser foot lifting lever pin (19) is inserted on the machine shell (8), and the corner of the presser foot lifting trimming lever (7) is positioned on the outer end surface of the presser foot lifting lever pin (19) and is rotationally connected with the presser foot lifting lever pin (19) through a shaft position screw (20).
7. The thread trimming and presser foot lifting device of a sewing machine according to claim 6, wherein: the presser foot lifting lever pin (19) is sleeved with a first reset torsion spring (21), one support arm of the first reset torsion spring (21) is inserted on the machine shell (8), and the other support arm is connected to the presser foot lifting trimming lever (7).
8. The thread trimming and presser foot lifting device of a sewing machine according to claim 1, wherein: the presser foot lifting small lever (11) can drive the presser foot arm crank shaft (4) to rotate in one direction: the presser foot arm crank shaft (4) is rotatably mounted on the machine shell (8) through a presser foot arm crank shaft sleeve (22), a limiting check ring (23) is further arranged on the presser foot arm crank shaft (4), the presser foot lifting small lever (11) is axially limited between the limiting check ring (23) and the presser foot arm crank shaft sleeve (22), a first bulge (24) extends towards one side of the presser foot lifting small lever (11) on the limiting check ring (23), a second bulge (25) is arranged on the presser foot lifting small lever (11), and when the presser foot lifting small lever (11) rotates, the presser foot lifting small lever (11) drives the presser foot arm crank shaft (4) to rotate when the first bulge (24) is abutted against the second bulge (25); on the contrary, the first bulge (24) and the second bulge (25) are separated, and the presser foot lifting small lever (11) cannot drive the presser foot arm crank shaft (4) to rotate.
9. The thread trimming and presser foot lifting device of a sewing machine according to claim 8, wherein: a second reset torsion spring (26) is sleeved outside the presser arm crankshaft sleeve (22), one end of the second reset torsion spring (26) is connected to the shell (8), and the other end of the second reset torsion spring is connected to the presser foot lifting small lever (11).
10. The thread trimming and presser foot lifting device of a sewing machine according to claim 1, wherein: the connecting hole (10) is an arc-shaped hole, an inward protruding portion (27) is arranged on the arc-shaped hole, an axial position screw is arranged at the other end of the presser foot lifting and trimming lever (7), the axial position screw is located in the arc-shaped hole, when the presser foot lifting and trimming lever (7) rotates downwards, the axial position screw acts on the protruding portion (27) of the arc-shaped hole to drive the trimming driving crank (9) to rotate, and when the presser foot lifting and trimming lever (7) rotates upwards, the axial position screw moves downwards along the arc-shaped hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120248280.3U CN214362137U (en) | 2021-01-28 | 2021-01-28 | Thread trimming and presser foot lifting device of sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120248280.3U CN214362137U (en) | 2021-01-28 | 2021-01-28 | Thread trimming and presser foot lifting device of sewing machine |
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| Publication Number | Publication Date |
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| CN214362137U true CN214362137U (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120248280.3U Active CN214362137U (en) | 2021-01-28 | 2021-01-28 | Thread trimming and presser foot lifting device of sewing machine |
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| CN (1) | CN214362137U (en) |
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2021
- 2021-01-28 CN CN202120248280.3U patent/CN214362137U/en active Active
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