CN213888368U - Head-replaceable cutter with high repeated positioning precision - Google Patents
Head-replaceable cutter with high repeated positioning precision Download PDFInfo
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- CN213888368U CN213888368U CN202023117976.7U CN202023117976U CN213888368U CN 213888368 U CN213888368 U CN 213888368U CN 202023117976 U CN202023117976 U CN 202023117976U CN 213888368 U CN213888368 U CN 213888368U
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Abstract
The utility model discloses a head-replaceable cutter of high repeated positioning accuracy belongs to the machine tool machining field. The tool comprises a replaceable tool bit and a tool bar, wherein the replaceable tool bit is provided with a positioning and torque transmission mechanism, the positioning and torque transmission mechanism comprises a conical boss and at least one lug, and the lug is arranged on the outer edge of the conical boss; the replaceable cutter head and the cutter bar are clamped with the conical groove and the lug and the clamping groove through the conical boss and the conical groove in the positioning and torsion transmission mechanism and are fixed through bolts. This cutter is equipped with conical boss of toper on interchangeable tool bit, and conical boss of toper can improve the effect of bearing to the torsional force that the cutter during operation produced, strengthens the fixed action of interchangeable tool bit in location and torsion transmission mechanism, prolongs the life-span of cutter. The lugs of the positioning and torque transmission mechanisms are unevenly distributed, repeated positioning accuracy can be improved, and system errors during cutter use can be reduced, so that cutter abrasion is reduced, cutter changing times are reduced, and product stability is further improved.
Description
Technical Field
The utility model relates to a machine tool machining field, concretely relates to interchangeable head cutter of high repeated positioning accuracy.
Background
The cutter on the market at present has interchangeable head, interchangeable blade, welding, whole isotructure, and interchangeable head cutter has whole cutter head's all advantages, also has interchangeable blade and welding cutter's low-cost advantage simultaneously, but the precision of being connected and the rigidity of being connected (torsion transmission) between tool bit and the cutter arbor just become crucial factor. The precision when having had the interchangeable head of high repeated positioning accuracy just can realize that the tool bit production precision is unanimous with the precision when using to reduce the systematic error in the use, improve the quality of being processed the product, stability reduces the operator and uses the degree of difficulty and improve life. The advantages of the head-replaceable cutter can be truly exerted.
In a conventional machine tool system, a general tool is divided into a tool bar and a tool bit, the tool bar is a connecting part for connecting with a machine tool, a replaceable blade is connected to the tool bar and directly acts on various cut products, the replaceable blade is continuously worn in the cutting process, so the replaceable blade needs to be frequently replaced, the conventional blade replacing method generally compresses the blade on the connecting surface of the tool bar through a locking screw, the connecting method is difficult to realize the centering connection between the blade and the tool bar, and the blade replacement is required to be adjusted repeatedly every time, so the blade replacing efficiency is seriously influenced.
The existing cutters are positioned in a plurality of ways during installation, for example, protrusions or grooves are arranged on contact surfaces, and the positioning is realized through the matching of the protrusions or the grooves. Disclosed in publication No. CN107498610A is a circular insert and a cutting tool having a precise positioning structure, wherein the tool is provided with at least three protrusions on the inner surface of the central hole, and the protrusions are uniformly arranged along the circumferential direction of the central hole.
Publication number CN108778589A discloses a cutting insert, a tool holder and a tool, a bottom side of a similar base body, extending transversely to the longitudinal axis of the cutting insert, being provided with a plurality of protrusions, which are arranged distributed in the peripheral direction and evenly distributed. So that between respectively two adjacent projections a relative recess is obtained, the projections and recesses being intended for fastening in connection with the insert.
Publication No. CN105269058A discloses a cutting tool equipped with a circular blade, wherein at least one positioning groove is arranged at the intersection of the bottom of the circular blade and the rear surface of the blade, and a positioning boss matched with the positioning groove is arranged on the bottom surface of the cutter groove. In the technical scheme, the cutting force borne by the circular blade and the pressing force of the pressing screw on the circular blade are subjected to component force through the positioning boss, so that the stress and deformation of the bottom surface of the circular blade are reduced, the integral strength of the cutter is increased, and the service life of the circular blade is prolonged; the circular blade is acted on the positioning boss by a torsional force generated by a cutting force, so that the circular blade is prevented from displacement, particularly from rotating. And the positioning groove and the positioning lug boss are U-shaped, triangular and necking U-shaped. In the description four positioning grooves are shown evenly distributed along the circumference of the circular insert.
Publication No. CN106180849A discloses a replaceable blade cutting tool, in which a hexagonal through hole is formed in the middle of a tool body, six elongated limiting grooves are uniformly spaced inside the hexagonal through hole, and the limiting grooves of the hexagonal through hole are also uniformly distributed.
In summary, the conventional limiting grooves or limiting protrusions are uniformly distributed on the circumference, and when one limiting groove or limiting protrusion is deviated, other limiting grooves or limiting protrusions are also deviated in sequence, so that the error of tool installation and positioning is increased in a repeated manner, the precision of the tool is reduced, and unique positioning cannot be formed.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a can the repeated location, and fix a position accurately, intensity is high, convenient operation, the interchangeable head cutter of the lower high repeated positioning accuracy of cost.
In order to achieve the above purpose, the present invention is realized by the following technical solutions:
a high-repeated positioning precision head-replaceable cutter comprises a head-replaceable cutter and a cutter bar connected with the head-replaceable cutter, wherein one surface of the head-replaceable cutter, which is in contact with the cutter bar, is a first contact surface, and a positioning and torque force transmission mechanism is arranged on the first contact surface; the replaceable cutter head is provided with at least one screw through hole for fixing the cutter head and the cutter bar by bolts;
the positioning and torsion transmission mechanism comprises a conical boss and at least one lug, and the diameter of the surface of the conical boss is smaller than that of the connecting surface of the conical boss and the replaceable tool bit; the lug is arranged at the outer edge of the boss;
one surface of the cutter bar, which is in contact with the replaceable cutter head, is a second contact surface, a conical groove matched with the conical boss is arranged on the second contact surface, and a clamping groove matched with the bump is arranged on the side surface of the conical groove; the replaceable cutter head and the cutter bar are positioned through a conical boss and a convex block in the positioning and torsion transmission mechanism, and a conical groove and a clamping groove in the cutter bar and are pressed and fixed through bolts.
Furthermore, the taper of the conical boss on the positioning and torsion transmission mechanism is 4-15 degrees; the conical surface angle of the groove is 4-15 degrees; a gap of 0.05mm-0.25mm exists between the cutter bar and the cutter head. The clearance fit between the bump and the slot is 0.05-0.25 mm.
Further, the lug is one or more, and more than one lug is distributed along the circumference at the outer edge of the conical boss.
Further, more than one of the convex blocks is unevenly distributed along the circumference at the outer edge of the conical boss.
Further, the number of the screw through holes is one or more, and the central axis of the screw through hole is parallel to the central axis of the replaceable cutter head.
The positioning and torque transmitting mechanism further comprises the screw through holes distributed circumferentially along the outer edge of the positioning and torque transmitting mechanism.
Furthermore, the outer edge of the replaceable cutter head is circular, or gear-shaped, or special-shaped.
Furthermore, the bump is a square bump, an arc bump or a special-shaped bump.
The utility model discloses high repeated positioning accuracy's interchangeable head cutter, its beneficial effect lies in:
(1) the tool bit is provided with a conical boss, the tool bar is provided with a conical groove, the conical boss is matched with the conical groove on the tool bar, and the gap between the first contact surface and the second contact surface is eliminated through the pressing force of the screw, so that double positioning is achieved, and the repeated positioning precision is improved.
(2) The positioning and torque transmission mechanism is provided with lugs which are distributed in unequal distribution regardless of the number. The lug has still played directional effect except that the effect of transmission torsion, and interchangeable tool bit and cutter arbor only have a direction to install, has further promoted positioning accuracy.
(3) The conical boss and the convex block on the tool bit are formed by one-time compression molding, so that the tool bit has high strength and greatly reduces the processing difficulty of a positioning and torque transmission mechanism.
(4) Thereby the repeated location of high accuracy and the torsion transmission of high rigidity can greatly reduced cutter reduce the rejection rate in the system error that causes when the tool changing, thereby can reduce the system error when the cutter uses and reduce the cutter wearing and tearing and reduce the tool changing number of times, further promote product stability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic plan view of the cutter head of the present invention (the projection is square);
fig. 2 is a schematic plan view of the cutter head of the present invention (the projection is arc-shaped);
FIG. 3 is a schematic plan view of the cutter head of the present invention (the bumps are shaped);
FIG. 4 is a schematic plan view of the cutter head of the present invention (the outer edge of the cutter head is gear-shaped);
FIG. 5 shows the connection of examples 1 and 3 (before the tool bit is pressed against the tool holder);
FIG. 6 shows the connection of example 2 (after the tool bit and the tool holder are pressed together);
1 cutter head, 2 cutter bar, 3 bolt and 4 gaps;
101 a first contact surface, 102 screw holes, 103 conical bosses, 104 conical surfaces of the bosses and 105 convex blocks;
201 conical recess.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and accompanying drawings.
Example 1
A replaceable cutter with high repeated positioning precision comprises a replaceable cutter head 1 and a cutter bar 2 connected with the replaceable cutter head 1, wherein one surface, which is in contact with the cutter bar 2, on the replaceable cutter head 1 is a first contact surface 102, and a positioning and torsion transmission mechanism is arranged on the first contact surface 102; the center of the replaceable cutter head 1 is provided with a screw hole 102 for fixing the replaceable cutter head 1 and the cutter bar 2 through screw perforation;
the positioning and torsion force transmission mechanism comprises a conical boss 103 and at least one lug 105, the inner edge of the conical boss 103 is flush with the edge of the screw hole 102, and the surface diameter of the conical boss 103 is smaller than the diameter of the connecting surface of the conical boss and the replaceable tool bit; the projection 105 is arranged at the outer edge of the conical boss 103;
the one side that the cutter arbor 2 was last, contacted with interchangeable tool bit 1 is the second contact surface, is equipped with on the second contact surface and matches complex circular cone recess 201 with conical boss 103 and lug 105, circular cone recess side be equipped with lug matched with draw-in groove, interchangeable tool bit 1 and cutter arbor 2 through conical boss 103 among location and the torsion transfer mechanism, lug 105 and the circular cone recess 201 and the draw-in groove location joint in the cutter arbor 2 and compress tightly fixedly through bolt 3.
In this embodiment, there are three bumps 105, and the three bumps 105 are not uniformly distributed along the circumference on the outer edge of the conical boss 103, i.e. the included angles between the three bumps 105 are different. The unevenly distributed protrusions 105 ensure that the exchangeable head 1 can only be mounted in one direction during mounting, whereas it cannot be mounted in the other two directions.
The taper of the conical boss in the positioning and torsion force transmission mechanism is 4 degrees; the conical groove of the second contact surface of the cutter bar is a conical surface matched with the conical boss, and the conical surface angle of the conical groove is 4 degrees; a gap 4 of 0.05mm-0.25mm exists between the cutter bar and the replaceable cutter head. The clearance fit between the bump and the slot is 0.05-0.25 mm.
As shown in fig. 5, the bumps are mainly used for transmitting torque and positioning direction, so that the precision of repeated positioning can be improved. The aperture of the conical groove is slightly smaller than that of the conical boss; when the lug and the conical boss on the replaceable cutter head are inserted into the conical groove on the cutter bar, a gap 4 of 0.05-0.25mm is formed between the first contact surface and the second contact surface. Further whereabouts to the cutter arbor is required to be passed through external force extrusion interchangeable tool bit this moment, and conical boss laminates with circular cone recess completely, and the draw-in groove that the lug corresponds with the cutter arbor is clearance fit, reaches the accurate location of interchangeable tool bit.
In this embodiment, the center of the replaceable cutter head 1 and the center of the cutter bar 2 are both provided with a screw hole 102 for fixing the replaceable cutter head 1 and the cutter bar 2 by a bolt 3, and the cutter bar 2 and the screw hole 102 of the replaceable cutter head 1 are corresponding to each other; the central axis of the threaded bore 102 is parallel to the central axis of the replaceable cutter head 1.
The replaceable cutter head 1 is placed on the cutter bar 2 and is in contact with the second contact surface, and the replaceable cutter head 1 is positioned and clamped on the cutter bar 2 through the matching between the conical boss 103 and the screw hole 102 as well as the matching between the convex block 105 and the conical groove 201. A screw hole 102 in the center of the cutter rod 2 is provided with threads; the bolt 3 penetrates through the central screw holes 102 on the replaceable cutter head 1 and the cutter bar 2, so that the replaceable cutter head 1 and the cutter bar 2 are fixedly connected into a whole.
In this embodiment, the outer edge of the replaceable cutter head 1 is in a gear shape, but is not limited to the gear shape.
In the present embodiment, the bump 105 is a square bump, but is not limited to a square bump.
Example 2
A head-replaceable tool with high repeated positioning precision, as shown in figures 1-4 and 6,
the tool comprises a replaceable tool bit 1 and a tool bar 2 connected with the replaceable tool bit 1, wherein a first contact surface 102 is arranged on the replaceable tool bit 1 and is in contact with the tool bar 2, and a positioning and torsion transmission mechanism is arranged on the first contact surface 102; the center of the replaceable cutter head 1 is provided with a screw hole 102 for fixing the replaceable cutter head 1 and the cutter bar 2 through screw perforation.
The positioning and torsion force transmission mechanism comprises a conical boss 103 and at least one lug 105, wherein the surface diameter of the conical boss 103 is smaller than the diameter of the connecting surface of the conical boss and the replaceable cutter head; the projection 105 is arranged at the outer edge of the conical boss 103;
the one side that the cutter arbor 2 was last, contacted with interchangeable tool bit 1 is the second contact surface, is equipped with on the second contact surface and matches complex circular cone recess 201 with conical boss 103 and lug 105, circular cone recess side be equipped with lug matched with draw-in groove, interchangeable tool bit 1 and cutter arbor 2 through conical boss 103 among location and the torsion transfer mechanism, lug 105 and the circular cone recess 201 and the draw-in groove location joint in the cutter arbor 2 and compress tightly fixedly through bolt 3.
In this embodiment, there are three bumps 105, and the three bumps 105 are not uniformly distributed along the circumference on the outer edge of the conical boss 103, i.e. the included angles between the three bumps 105 are different. The uneven distribution of the convex blocks 105 can ensure that the replaceable cutter head 1 can be installed in only one direction during installation, other two directions cannot be installed, the same positioning and precision can be achieved even if the cutter head is replaced, and the precision of repeated positioning is improved.
The taper of the conical boss in the positioning and torsion force transmission mechanism is 15 degrees; the conical groove of the second contact surface of the cutter bar is a conical surface matched with the conical boss, and the conical surface angle of the conical groove is 15 degrees; a gap 4 of 0.05mm-0.25mm exists between the cutter bar and the replaceable cutter head. The clearance fit between the bump and the slot is 0.05-0.25 mm.
The effect of lug is mainly transmission moment of torsion, location direction, can promote the precision of repeated location. The aperture of the conical groove is slightly smaller than that of the conical boss; when the lug and the conical boss on the replaceable cutter head are inserted into the conical groove on the cutter bar, a gap 4 of 0.05-0.25mm is formed between the first contact surface and the second contact surface. Further whereabouts to the cutter arbor is required to be passed through external force extrusion interchangeable tool bit this moment, and conical boss laminates with circular cone recess completely, and the draw-in groove that the lug corresponds with the cutter arbor is clearance fit, reaches the accurate location of interchangeable tool bit.
In this embodiment, the cutter bar 2 and the replaceable cutter head 1 are provided with three screw holes 102, the outer edges of the three screw hole 102 positioning and torque force transmitting mechanisms are circumferentially distributed, and the central axis of the screw hole 102 is parallel to the central axis of the replaceable cutter head 1. And the threaded holes 102 of the exchangeable tool bit 1 and the tool holder 2 correspond to each other.
The replaceable cutter head 1 is placed on the cutter bar 2 and is in contact with the second contact surface, and the replaceable cutter head 1 is positioned and clamped on the cutter bar 2 through the matching between the conical boss 103 and the screw hole 102 as well as the matching between the convex block 105 and the conical groove 201. A screw hole 102 in the center of the cutter rod 2 is provided with threads; the bolt 3 penetrates through three screw holes 102 on the replaceable cutter head 1 and the cutter bar 2, so that the replaceable cutter head 1 and the cutter bar 2 are fixedly connected into a whole.
In this embodiment, the number of the screw holes 102 of the replaceable cutter head 1 is not limited to three, but may be one, two, four, or more. As long as fixation can be achieved.
In this embodiment, the outer edge of the replaceable cutter head 1 is in a gear shape, but is not limited to the gear shape.
In the present embodiment, the bump 105 is a shaped bump, but not limited to a shaped bump.
Example 3
A replaceable cutter with high repeated positioning precision comprises a replaceable cutter head 1 and a cutter bar 2 connected with the replaceable cutter head 1, wherein one surface, which is in contact with the cutter bar 2, on the replaceable cutter head 1 is a first contact surface 102, and a positioning and torsion transmission mechanism is arranged on the first contact surface 102; the center of the replaceable cutter head 1 is provided with a screw hole 102 for fixing the replaceable cutter head 1 and the cutter bar 2 through screw perforation.
The positioning and torsion force transmission mechanism comprises a conical boss 103 and at least one lug 105, the inner edge of the conical boss 103 is flush with the edge of the screw hole 102, and the surface diameter of the conical boss 103 is smaller than the diameter of the connecting surface of the conical boss and the replaceable tool bit; the projection 105 is arranged at the outer edge of the conical boss 103;
the one side that the cutter arbor 2 was last, contacted with interchangeable tool bit 1 is the second contact surface, is equipped with on the second contact surface and matches complex circular cone recess 201 with conical boss 103 and lug 105, circular cone recess side be equipped with lug matched with draw-in groove, interchangeable tool bit 1 and cutter arbor 2 through conical boss 103 among location and the torsion transfer mechanism, lug 105 and the circular cone recess 201 and the draw-in groove location joint in the cutter arbor 2 and compress tightly fixedly through bolt 3.
In this embodiment, the protrusion 105 is one and is disposed on the outer edge of the conical boss 103, so that the positioning can be accurately performed. The taper of the conical surface 104 of the conical boss 103 on the positioning and torsion force transmission mechanism is 10 degrees, and the conical surface 104 of the conical boss 103 of the cutter can improve the bearing force on torsion force, so that the service life of the cutter is prolonged.
The taper of the conical boss in the positioning and torsion force transmission mechanism is 10 degrees; the conical groove of the second contact surface of the cutter bar is a conical surface matched with the conical boss, and the conical surface angle of the conical groove is 10 degrees; a gap 4 of 0.05mm-0.25mm exists between the cutter bar and the replaceable cutter head. The clearance fit between the bump and the slot is 0.05-0.25 mm.
The effect of lug is mainly transmission moment of torsion, location direction, can promote the precision of repeated location. The aperture of the conical groove is slightly smaller than that of the conical boss; when the lug and the conical boss on the replaceable cutter head are inserted into the conical groove on the cutter bar, a gap 4 of 0.05-0.25mm is formed between the first contact surface and the second contact surface. Further whereabouts to the cutter arbor is required to be passed through external force extrusion interchangeable tool bit this moment, and conical boss laminates with circular cone recess completely, and the draw-in groove that the lug corresponds with the cutter arbor is clearance fit, reaches the accurate location of interchangeable tool bit.
The common conical boss in the prior art is a complete circle and is difficult to extrude and deform, so that accurate positioning cannot be achieved. Set for the conical surface and the conical surface is equipped with a plurality of lugs, forms the breach between the lug, and extrusion deformation is easy, and the location is more accurate.
In this embodiment, the center of the replaceable cutter head 1 and the center of the cutter bar 2 are both provided with a screw hole 102 for fixing the replaceable cutter head 1 and the cutter bar 2 by a bolt 3, and the cutter bar 2 and the screw hole 102 of the replaceable cutter head 1 are corresponding to each other; the central axis of the threaded bore 102 is parallel to the central axis of the replaceable cutter head 1.
The replaceable cutter head 1 is placed on the cutter bar 2 and is in contact with the second contact surface, and the replaceable cutter head 1 is positioned and clamped on the cutter bar 2 through the matching between the conical boss 103 and the screw hole 102 as well as the matching between the convex block 105 and the conical groove 201. A screw hole 102 in the center of the cutter rod 2 is provided with threads; the bolt 3 penetrates through the central screw holes 102 on the replaceable cutter head 1 and the cutter bar 2, so that the replaceable cutter head 1 and the cutter bar 2 are fixedly connected into a whole.
In this embodiment, the outer edge of the replaceable cutter head 1 is in a gear shape, but is not limited to the gear shape.
In the present embodiment, the bump 105 is a square bump, but is not limited to a square bump.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the above embodiments are only applicable to help understand the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the content of the description should not be construed as a limitation to the present invention.
Claims (8)
1. The utility model provides a head-replaceable cutter of high repeated positioning accuracy which characterized in that: the tool comprises an interchangeable tool bit and a tool bar connected with the interchangeable tool bit, wherein one surface of the interchangeable tool bit, which is in contact with the tool bar, is a first contact surface, and a positioning and torsion transmission mechanism is arranged on the first contact surface; the replaceable cutter head is provided with at least one screw through hole for fixing the cutter head and the cutter bar by bolts;
the positioning and torsion transmission mechanism comprises a conical boss and at least one lug, and the diameter of the surface of the conical boss is smaller than that of the connecting surface of the conical boss and the replaceable tool bit; the lug is arranged at the outer edge of the boss;
one surface of the cutter bar, which is in contact with the replaceable cutter head, is a second contact surface, a conical groove matched with the conical boss is arranged on the second contact surface, and a clamping groove matched with the bump is arranged on the side surface of the conical groove; the replaceable cutter head and the cutter bar are positioned through a conical boss and a convex block in the positioning and torsion transmission mechanism, and a conical groove and a clamping groove in the cutter bar and are pressed and fixed through bolts.
2. The high repositioning accuracy interchangeable head tool of claim 1, wherein: the taper of the conical boss on the positioning and torsion transmission mechanism is 4-15 degrees; the conical surface angle of the groove is between 4 and 15 degrees; a gap of 0.05mm-0.25mm exists between the cutter bar and the cutter head.
3. The high repositioning accuracy interchangeable head tool of claim 1, wherein: the lug is one or more, and more than one lug is along the circumference distribution at the outer edge of conical boss.
4. The high repositioning accuracy interchangeable head tool of claim 3, wherein: more than one lug is uneven along the circumference at the outer edge of conical boss.
5. The high repositioning accuracy interchangeable head tool of claim 1, wherein: the number of the screw through holes is one or more, and the central axis of the screw through hole is parallel to the central axis of the replaceable cutter head.
6. The high repositioning accuracy interchangeable head tool of claim 5, wherein: a plurality of the screw bores are circumferentially distributed along an outer edge of the positioning and torque transmitting mechanism.
7. A high-precision repositionable head tool as defined in any of claims 1 to 6 wherein: the outer edge of the replaceable cutter head is circular, gear-shaped or special-shaped.
8. A high-precision repositionable head tool as defined in any of claims 1 to 6 wherein: the convex block is a square convex block, an arc convex block or a special-shaped convex block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023117976.7U CN213888368U (en) | 2020-12-22 | 2020-12-22 | Head-replaceable cutter with high repeated positioning precision |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023117976.7U CN213888368U (en) | 2020-12-22 | 2020-12-22 | Head-replaceable cutter with high repeated positioning precision |
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| Publication Number | Publication Date |
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| CN213888368U true CN213888368U (en) | 2021-08-06 |
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| CN202023117976.7U Active CN213888368U (en) | 2020-12-22 | 2020-12-22 | Head-replaceable cutter with high repeated positioning precision |
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| CN (1) | CN213888368U (en) |
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- 2020-12-22 CN CN202023117976.7U patent/CN213888368U/en active Active
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