CN214212424U - Inner circle cutting power head with hydraulic adjusting device - Google Patents
Inner circle cutting power head with hydraulic adjusting device Download PDFInfo
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- CN214212424U CN214212424U CN202120051169.5U CN202120051169U CN214212424U CN 214212424 U CN214212424 U CN 214212424U CN 202120051169 U CN202120051169 U CN 202120051169U CN 214212424 U CN214212424 U CN 214212424U
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Abstract
The utility model provides a take hydraulic pressure adjusting device's interior circle cutting unit head, belongs to cutting unit head technical field, has solved in cutting process, and the blade produces owing to receive factors such as friction, vibration and warp and influence cutting effect and the more technical problem such as belt pulley transmission structure. The solution is as follows: the utility model provides a take hydraulic pressure adjusting device's interior circle cutting unit head, include the first hydraulic pressure adjusting device who turns right from a left side and set gradually, driving motor, second hydraulic pressure adjusting device and blade disc device, first hydraulic pressure adjusting device includes first cylinder, first piston, adjusting sleeve and manometer, second hydraulic pressure adjusting device includes motor flange, the bearing overcoat, the bearing retainer ring, a plurality of bearings, second cylinder and second piston, the blade disc device includes the blade disc flange, the fixed blade disc, the movable blade disc, interior circle cutting blade and annular pressure plate. The utility model discloses observe convenient, can adjust the operating condition of circle cutting blade in fast speed, do not influence the efficiency and the quality of cutting, driving motor's setting saves the structure.
Description
Technical Field
The utility model belongs to the technical field of the cutting unit head, concretely relates to take interior circle cutting unit head of hydraulic pressure adjusting device.
Background
The inner circle cutting blade is a cutting tool, is ultrathin in thickness, enables an inner circle to rapidly cut a part to be cut through rapid rotation, and has the advantages of small cutting seam, small cutting flatness, high grinding efficiency and the like. The inner circle cutting blade is connected with the fixing device through a circle of connecting bolt holes on the periphery in a bolt mode, and due to the fact that the inner circle cutting blade is thin, a better cutting effect can be achieved only by stretching and straightening.
In the actual working process, there are two problems:
firstly, the blade needs to be pre-expanded after being installed and before cutting, and in the cutting process, the blade can deform due to the influence of factors such as friction, vibration, stress, heating and the like, so that the cutting effect is greatly influenced, and the blade needs to be expanded, at the moment, bolts are generally fastened and connected artificially, so that not only is time consumed, but also the fastening imbalance of a circle of bolts is easily caused, the slight inclination of an inner circle cutting blade is caused, and the cutting efficiency and the cutting quality are influenced;
secondly, most of the belt wheel structure is driven by a motor to enable the inner circle cutting blade to work, and the belt wheel structure has more related parts and occupies more space.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's shortcoming, provide a take hydraulic pressure adjusting device's interior circle cutting unit head, solved in cutting process, the blade is owing to receive factors such as friction, vibration, atress, generate heat and produce and warp and influence technical problem such as cutting effect and belt pulley transmission structure are more.
In order to solve the above problem, the technical scheme of the utility model is that: the utility model provides a take hydraulic pressure adjusting device's internal circle cutting unit head, wherein: the device comprises a first hydraulic adjusting device, a driving motor, a second hydraulic adjusting device and a cutter head device which are sequentially arranged from left to right; the driving motor is a coaxial double-output-shaft motor, and a through hole is formed in the middle of a rotating shaft of the driving motor along the axis direction;
the first hydraulic adjusting device comprises a first cylinder barrel, a first piston, an adjusting sleeve and a pressure gauge, wherein the left extending end of the rotating shaft extends into an inner cavity of the first cylinder barrel from the right side wall of the first cylinder barrel, the left extending end of the rotating shaft is fixedly connected with the first cylinder barrel, and the inner cavity of the first cylinder barrel is communicated with the through hole of the rotating shaft; the adjusting sleeve is arranged on the left side of the first cylinder barrel, the inner wall of the right end of the adjusting sleeve is in threaded connection with the outer wall of the left end of the first cylinder barrel, a first piston rod through hole is formed in the middle of the side wall of the left side of the adjusting sleeve, the first piston is arranged in the inner cavity of the first cylinder barrel, a piston rod at the left end of the first piston extends outwards from the first piston rod through hole, an oil passing channel in the horizontal direction is formed in the middle of the first piston, and the pressure gauge is arranged on the left side of the first piston and is communicated with the oil passing channel;
the second hydraulic adjusting device comprises a motor connecting flange, a bearing outer sleeve, a bearing retainer ring, a plurality of bearings, a second cylinder and a second piston, the motor connecting flange is fixedly arranged on the right end face of the driving motor, a rotating shaft through hole is formed in the middle of the motor connecting flange, the bearing outer sleeve is arranged on the right side of the motor connecting flange, the second cylinder is arranged in the bearing outer sleeve, the second piston is arranged in an inner cavity of the second cylinder, the outer wall of the second cylinder is connected with the bearing outer sleeve through the plurality of bearings and rotates relative to the bearing outer sleeve, the bearing retainer ring is arranged on the right end face of the bearing outer sleeve, and the inner diameter of the bearing retainer ring is smaller than the outer diameter of the bearing; the right extending end of the rotating shaft penetrates through a rotating shaft through hole of the motor connecting flange and then extends into an inner cavity of the second cylinder from the left side wall of the second cylinder, the second cylinder is fixedly connected with the right extending end of the rotating shaft, and the inner cavity of the second cylinder is communicated with the through hole;
the cutter head device comprises a cutter head flange, a fixed cutter head, a movable cutter head, an inner circle cutting blade and an annular pressing plate, wherein the fixed cutter head is a cylindrical guide sleeve which is horizontally arranged, the cutter head flange is connected with the left end face of the fixed cutter head, the annular pressing plate is arranged on one side of the right end face of the fixed cutter head and is connected with the fixed cutter head through a connecting bolt, the movable cutter head is a cylindrical cylinder body with one open end, the movable cutter head is horizontally arranged in the inner cavity of the fixed cutter head, the open end of the movable cutter head is close to one side of the annular pressing plate, the horizontal width of the movable cutter head and the horizontal width of the fixed cutter head are matched, the outer diameter of the movable cutter head is consistent with the inner diameter of the fixed cutter head, and the installation edge of the inner circle cutting blade is arranged between the annular pressing plate and the fixed cutter head;
a second piston rod through hole is formed in the middle of the cutter head flange, annular bosses matched with a second piston are arranged on the left side wall of the cutter head flange and in the circumferential direction of the second piston rod through hole, the cutter head flange is arranged on the right side of the second hydraulic adjusting device and is connected with the right end face of the second cylinder through a bolt, the annular bosses extend into an inner cavity of the second cylinder, and a piston rod at the right end of the second piston penetrates through the second piston rod through hole to be connected with the movable cutter; a butterfly spring is arranged at the contact position of the end face of the cutter head flange and the end face of the second piston;
and hydraulic oil is filled in the cavities of the oil passage, the first cylinder barrel, the through hole and the second cylinder barrel.
Furthermore, a first sealing ring is installed at the contact position of the inner wall of the first cylinder barrel and the left extending end of the rotating shaft.
Furthermore, two sets of round nuts are installed on the outer wall of the left end of the left extending end of the rotating shaft to fix the first cylinder barrel.
Furthermore, a first check ring is arranged at the left end of the first cylinder barrel.
Furthermore, a second sealing ring is installed at the contact position of the inner wall of the second cylinder and the right extending end of the rotating shaft.
Furthermore, a round nut is installed on the outer wall of the left end of the second cylinder barrel to axially fix the bearing.
Furthermore, the bearing is equipped with three groups, be equipped with the bearing adjusting pad between the bearing.
Furthermore, the second cylinder is fixedly sleeved at the right extending end of the rotating shaft through an expansion sleeve.
Compared with the prior art, the beneficial effects of the utility model are that:
1. after the inner circle cutting blade works for a period of time, after the inner circle cutting blade is loosened, the pressure of hydraulic oil can float on the pressure gauge, the pressure gauge is observed, the adjusting sleeve is manually twisted, the adjusting sleeve drives the first piston to move, the hydraulic oil pushes the second piston on the right side to move under the action of the first piston, at the moment, the movable cutter disc can extrude the whole circle of the inner circle cutting blade, and the inner circle cutting blade is uniformly stretched again;
2. adopt coaxial two axle motors that go out, seted up the through-hole in driving motor's the pivot, make the hydraulic oil intercommunication of both sides, driving motor work, the pivot rotates, drives the second cylinder on right side and rotates, and then drives the blade disc device and rotate, carries out cutting work.
The utility model discloses observe convenient, easy operation, can adjust the operating condition of circle cutting blade in fast speed, do not influence the efficiency and the quality of cutting, driving motor's setting is saved the structure, saves space.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the internal circle cutting power head with the hydraulic adjusting device comprises: the device comprises a first hydraulic adjusting device 1, a driving motor 2, a second hydraulic adjusting device 3 and a cutter head device 4 which are sequentially arranged from left to right; the driving motor 2 is a coaxial double-output-shaft motor, and a through hole 2-2 is formed in the middle of a rotating shaft 2-1 of the driving motor 2 along the axis direction;
the first hydraulic adjusting device 1 comprises a first cylinder barrel 1-1, a first piston 1-2, an adjusting sleeve 1-3 and a pressure gauge 1-4, the left extending end of the rotating shaft 2-1 extends into the inner cavity of the first cylinder barrel 1-1 from the right side wall of the first cylinder barrel 1-1, the left extending end of the rotating shaft 2-1 is fixedly connected with the first cylinder barrel 1-1, and the inner cavity of the first cylinder barrel 1-1 is communicated with a through hole 2-2 of the rotating shaft 2-1; the adjusting sleeve 1-3 is arranged on the left side of the first cylinder barrel 1-1, the inner wall of the right end of the adjusting sleeve 1-3 is in threaded connection with the outer wall of the left end of the first cylinder barrel 1-1, a first piston rod through hole 1-3-1 is arranged in the middle of the side wall of the left side of the adjusting sleeve 1-3, the first piston 1-2 is arranged in the inner cavity of the first cylinder barrel 1-1, a piston rod at the left end of the first piston 1-2 extends outwards from the first piston rod through hole 1-3-1, an oil passing channel 1-2-1 in the horizontal direction is arranged in the middle of the first piston 1-2, and the pressure gauge 1-4 is arranged on the left side of the first piston 1-2 and communicated with the oil passing channel 1-2-1;
the second hydraulic adjusting device 3 comprises a motor connecting flange 3-1, a bearing outer sleeve 3-2, a bearing retainer ring 3-3, a plurality of bearings 3-4, a second cylinder 3-5 and a second piston 3-6, the motor connecting flange 3-1 is fixedly arranged on the right end face of the driving motor 2, a rotating shaft through hole 3-1-1 is arranged in the middle of the motor connecting flange 3-1, the bearing outer sleeve 3-2 is arranged on the right side of the motor connecting flange 3-1, the second cylinder 3-5 is arranged in the bearing outer sleeve 3-2, the second piston 3-6 is arranged in an inner cavity of the second cylinder 3-5, the outer wall of the second cylinder 3-5 is connected with the bearing outer sleeve 3-2 through a plurality of bearings 3-4, and the second cylinder 3-5 rotates relative to the bearing outer sleeve 3-2, the bearing retainer ring 3-3 is arranged on the right end face of the bearing outer sleeve 3-2, and the inner diameter of the bearing retainer ring 3-3 is smaller than the outer diameter of the bearing 3-4; the right extending end of the rotating shaft 2-1 penetrates through a rotating shaft through hole 3-1-1 of the motor connecting flange 3-1 and then extends into an inner cavity of a second cylinder 3-5 from the left side wall of the second cylinder 3-5, the second cylinder 3-5 is fixedly connected with the right extending end of the rotating shaft 2-1, and the inner cavity of the second cylinder 3-5 is communicated with the through hole 2-2;
the cutter head device 4 comprises a cutter head flange 4-1, a fixed cutter head 4-2, a movable cutter head 4-3, an inner circle cutting blade 4-4 and an annular pressing plate 4-5, the fixed cutter head 4-2 is a cylindrical guide sleeve arranged horizontally, the cutter head flange 4-1 is connected with the left end face of the fixed cutter head 4-2, the annular pressing plate 4-5 is arranged on one side of the end face of the right end of the fixed cutter head 4-2 and is connected with the fixed cutter head 4-2 through a connecting bolt, the movable cutter head 4-3 is a cylindrical cylinder body with one open end, the movable cutter head 4-3 is horizontally arranged in an inner cavity of the fixed cutter head 4-2, the open end of the movable cutter head 4-3 is close to one side of the annular pressing plate 4-5, and the width of the movable cutter head 4-3 in the horizontal direction and the width of the fixed cutter head 4-2 in the horizontal direction are matched, the outer diameter of the movable cutter head 4-3 is consistent with the inner diameter of the fixed cutter head 4-2 in size, and the installation edge of the inner circle cutting blade 4-4 is arranged between the annular pressure plate 4-5 and the fixed cutter head 4-2;
a second piston rod through hole 4-1-1 is formed in the middle of the cutter head flange 4-1, an annular boss 4-1-2 matched with a second piston 3-6 is arranged on the left side wall of the cutter head flange 4-1 and in the circumferential direction of the second piston rod through hole 4-1-1, the cutter head flange 4-1 is arranged on the right side of the second hydraulic adjusting device 3 and is connected with the right end face of the second cylinder 3-5 through a bolt, the annular boss 4-1-2 extends into the inner cavity of the second cylinder 3-5, and a piston rod at the right end of the second piston 3-6 penetrates through the second piston rod through hole 4-1-1 to be connected with the movable cutter head 4-3; a butterfly spring 5 is arranged at the contact position of the end face of the cutter head flange 4-1 and the end face of the second piston 3-6;
and hydraulic oil is filled in the cavities of the oil passage 1-2-1, the first cylinder barrel 1-1, the through hole 2-2 and the second cylinder barrel 3-5.
Furthermore, a first sealing ring 6 is arranged at the contact position of the inner wall of the first cylinder barrel 1-1 and the left extending end of the rotating shaft 2-1.
Furthermore, two groups of round nuts are mounted on the outer wall of the left end of the left extending end of the rotating shaft 2-1 to fix the first cylinder barrel 1-1.
Further, a first retainer ring 7 is arranged at the left end of the first cylinder barrel 1-1.
Further, a second sealing ring 8 is arranged at the contact position of the inner wall of the second cylinder 3-5 and the right extending end of the rotating shaft 2-1.
Furthermore, a round nut is arranged on the outer wall of the left end of the second cylinder 3-5 to axially fix the bearing 3-4.
Furthermore, three groups of bearings 3-4 are arranged, and a bearing adjusting pad 9 is arranged between the bearings.
Further, the second cylinder 3-5 is fixedly sleeved at the right extending end of the rotating shaft 2-1 through an expansion sleeve.
The utility model discloses a working process:
the driving motor 2 is a pair of coaxial double-output-shaft motors, a through hole 2-2 is formed in a rotating shaft 2-1, the left side and the right side of the rotating shaft are communicated through the through hole 2-2, hydraulic oil is filled in cavities of an oil passage 1-2-1, a first cylinder barrel 1-1, the through hole 2-2 and a second cylinder barrel 3-5, and the pressure value displayed by a pressure gauge 1-4 is observed and recorded;
the driving motor 2 starts to work, the rotating shaft 2-1 rotates, the first hydraulic adjusting device 1 on the left side rotates along with the rotation of the rotating shaft 2-1, the motor connecting flange 3-1 on the right side, the bearing outer sleeve 3-2 and the bearing retainer ring 3-3 are in a static state, the second cylinder 3-5 is fixedly connected with the right extending end of the rotating shaft 2-1 through an expansion sleeve, the second cylinder 3-5 rotates along with the rotating shaft 2-1, the cutter head flange 4-1 is connected with the right end face of the second cylinder 3-5 through a bolt, under the rotation of the second cylinder 3-5, the cutter head flange 4-1, the fixed cutter head 4-2, the inner circle cutting blade 4-4 and the annular pressing plate 4-5 are driven to rotate simultaneously, and the inner circle cutting blade 4-4 starts to work to cut;
after the inner circle cutting blade 4-4 works for a period of time, if the pressure gauge 1-4 changes, the inner circle cutting blade 4-4 is loosened, the adjusting sleeve 1-3 is screwed inwards to push the first piston 1-2 to move, the second piston 3-6 is pushed to extrude the belleville spring 5 under the action of hydraulic oil, the movable cutter disc 4-3 is connected with a piston rod at the right end of the second piston 3-6, namely the movable cutter disc 4-3 moves rightwards along with the second piston 3-6, the movable cutter disc 4-3 extrudes the inner circle cutting blade 4-4 arranged at the front part in a whole circle, and then the inner circle cutting blade 4-4 is adjusted in a balanced and straight manner, so that the cutting efficiency and quality are guaranteed.
Claims (8)
1. The utility model provides a take hydraulic pressure adjusting device's internal circle cutting unit head which characterized in that: the device comprises a first hydraulic adjusting device (1), a driving motor (2), a second hydraulic adjusting device (3) and a cutter head device (4) which are arranged from left to right in sequence; the driving motor (2) is a coaxial double-output-shaft motor, and a through hole (2-2) is formed in the middle of a rotating shaft (2-1) of the driving motor (2) along the axis direction;
the first hydraulic adjusting device (1) comprises a first cylinder barrel (1-1), a first piston (1-2), an adjusting sleeve (1-3) and a pressure gauge (1-4), the left extending end of the rotating shaft (2-1) extends into the inner cavity of the first cylinder barrel (1-1) from the right side wall of the first cylinder barrel (1-1), the left extending end of the rotating shaft (2-1) is fixedly connected with the first cylinder barrel (1-1), and the inner cavity of the first cylinder barrel (1-1) is communicated with a through hole (2-2) of the rotating shaft (2-1); the adjusting sleeve (1-3) is arranged on the left side of the first cylinder barrel (1-1), the inner wall of the right end of the adjusting sleeve (1-3) is in threaded connection with the outer wall of the left end of the first cylinder barrel (1-1), a first piston rod through hole (1-3-1) is arranged in the middle of the left side wall of the adjusting sleeve (1-3), the first piston (1-2) is arranged in the inner cavity of the first cylinder barrel (1-1), and the piston rod at the left end of the first piston (1-2) extends outwards from the first piston rod through hole (1-3-1), the middle part of the first piston (1-2) is provided with an oil passage (1-2-1) in the horizontal direction, the pressure gauge (1-4) is arranged on the left side of the first piston (1-2) and communicated with the oil passage (1-2-1);
the second hydraulic adjusting device (3) comprises a motor connecting flange (3-1), a bearing outer sleeve (3-2), a bearing retainer ring (3-3), a plurality of bearings (3-4), a second cylinder (3-5) and a second piston (3-6), the motor connecting flange (3-1) is fixedly arranged on the right end face of the driving motor (2), a rotating shaft through hole (3-1-1) is formed in the middle of the motor connecting flange (3-1), the bearing outer sleeve (3-2) is arranged on the right side of the motor connecting flange (3-1), the second cylinder (3-5) is arranged in the bearing outer sleeve (3-2), the second piston (3-6) is arranged in the inner cavity of the second cylinder (3-5), and the outer wall of the second cylinder (3-5) is connected with the bearing outer sleeve (3-2) through the plurality of bearings (3-4) The second cylinder barrel (3-5) rotates relative to the bearing outer sleeve (3-2), the bearing retainer ring (3-3) is arranged on the right end face of the bearing outer sleeve (3-2), and the inner diameter of the bearing retainer ring (3-3) is smaller than the outer diameter of the bearing (3-4); the right extending end of the rotating shaft (2-1) penetrates through a rotating shaft through hole (3-1-1) of the motor connecting flange (3-1) and then extends into an inner cavity of a second cylinder (3-5) from the left side wall of the second cylinder (3-5), the second cylinder (3-5) is fixedly connected with the right extending end of the rotating shaft (2-1), and the inner cavity of the second cylinder (3-5) is communicated with the through hole (2-2);
the cutter head device (4) comprises a cutter head flange (4-1), a fixed cutter head (4-2), a movable cutter head (4-3), an inner circle cutting blade (4-4) and an annular pressing plate (4-5), wherein the fixed cutter head (4-2) is a cylindrical guide sleeve horizontally arranged, the cutter head flange (4-1) is connected with the end face of the left end of the fixed cutter head (4-2), the annular pressing plate (4-5) is arranged on one side of the end face of the right end of the fixed cutter head (4-2) and is connected with the fixed cutter head (4-2) through a connecting bolt, the movable cutter head (4-3) is a cylindrical cylinder body with one open end, the movable cutter head (4-3) is horizontally arranged in the inner cavity of the fixed cutter head (4-2), and the open end of the movable cutter head (4-3) is close to one side of the annular pressing plate (4-5), the horizontal width of the movable cutter disc (4-3) and the horizontal width of the fixed cutter disc (4-2) are matched, the outer diameter of the movable cutter disc (4-3) is consistent with the inner diameter of the fixed cutter disc (4-2), and the installation edge of the inner circle cutting blade (4-4) is arranged between the annular pressing plate (4-5) and the fixed cutter disc (4-2);
a second piston rod through hole (4-1-1) is formed in the middle of the cutter head flange (4-1), an annular boss (4-1-2) matched with a second piston (3-6) is arranged on the left side wall of the cutter head flange (4-1) and in the circumferential direction of the second piston rod through hole (4-1-1), the cutter head flange (4-1) is arranged on the right side of the second hydraulic adjusting device (3) and is connected with the right end face of the second cylinder (3-5) through a bolt, the annular boss (4-1-2) extends into the inner cavity of the second cylinder (3-5), and a piston rod at the right end of the second piston (3-6) penetrates through the second piston rod through hole (4-1-1) to be connected with the movable cutter (4-3); a butterfly spring (5) is arranged at the contact position of the end face of the cutter flange (4-1) and the end face of the second piston (3-6);
and hydraulic oil is filled in the cavities of the oil passage (1-2-1), the first cylinder barrel (1-1), the through hole (2-2) and the second cylinder barrel (3-5).
2. The internal circle cutting power head with the hydraulic adjusting device according to claim 1, characterized in that: and a first sealing ring (6) is arranged at the contact position of the inner wall of the first cylinder barrel (1-1) and the left extending end of the rotating shaft (2-1).
3. The internal circle cutting power head with the hydraulic adjusting device according to claim 1, characterized in that: two groups of round nuts are mounted on the outer wall of the left end of the left extending end of the rotating shaft (2-1) to fix the first cylinder barrel (1-1).
4. The internal circle cutting power head with the hydraulic adjusting device according to claim 1, characterized in that: the left end of the first cylinder barrel (1-1) is provided with a first check ring (7).
5. The internal circle cutting power head with the hydraulic adjusting device according to claim 1, characterized in that: and a second sealing ring (8) is arranged at the contact position of the inner wall of the second cylinder barrel (3-5) and the right extending end of the rotating shaft (2-1).
6. The internal circle cutting power head with the hydraulic adjusting device according to claim 1, characterized in that: and a round nut is arranged on the outer wall of the left end of the second cylinder barrel (3-5) to axially fix the bearing (3-4).
7. The internal circle cutting power head with the hydraulic adjusting device according to claim 1, characterized in that: three groups of bearings (3-4) are arranged, and bearing adjusting pads (9) are arranged between the bearings.
8. The internal circle cutting power head with the hydraulic adjusting device according to claim 1, characterized in that: the second cylinder barrel (3-5) is fixedly sleeved at the right extending end of the rotating shaft (2-1) through an expansion sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120051169.5U CN214212424U (en) | 2021-01-08 | 2021-01-08 | Inner circle cutting power head with hydraulic adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120051169.5U CN214212424U (en) | 2021-01-08 | 2021-01-08 | Inner circle cutting power head with hydraulic adjusting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214212424U true CN214212424U (en) | 2021-09-17 |
Family
ID=77709306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120051169.5U Active CN214212424U (en) | 2021-01-08 | 2021-01-08 | Inner circle cutting power head with hydraulic adjusting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214212424U (en) |
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2021
- 2021-01-08 CN CN202120051169.5U patent/CN214212424U/en active Active
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