CN209830145U - Rolling cutting device of super-huge bearing forging - Google Patents
Rolling cutting device of super-huge bearing forging Download PDFInfo
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- CN209830145U CN209830145U CN201920489621.9U CN201920489621U CN209830145U CN 209830145 U CN209830145 U CN 209830145U CN 201920489621 U CN201920489621 U CN 201920489621U CN 209830145 U CN209830145 U CN 209830145U
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Abstract
The utility model belongs to the technical field of rolling and cutting of super-huge type bearing forgings, and discloses a rolling and cutting device of super-huge type bearing forgings, wherein a rolling and cutting die is sleeved on a mandrel and is pressed and fixed by a pressing part of a pressing arm; the rolling cutting die comprises an inner cylinder, the inner cylinder is a hollow cylinder, and the outer wall of the inner cylinder is provided with an outer thread of the inner cylinder through the whole body; the limiting bottom plate is fixedly arranged at the bottom of the inner cylinder and is fixedly connected with the inner cylinder into a whole; the die body is provided with a through hole in the center, the inner wall of the through hole is provided with an internal thread in the whole body, and the die body is screwed on the inner cylinder through the external thread of the inner cylinder; the limiting convex ring is provided with a through hole as the center, and the inner wall of the through hole is provided with a limiting convex ring internal thread through the body. The rolling cutting device for the super-large bearing forging greatly improves the cutting efficiency when the super-large bearing forging is cut, improves the strength and the mechanical property of the central part of the super-large bearing forging and reduces the cutting cost.
Description
Technical Field
The utility model belongs to the technical field of the rolling cutting of super-huge bearing forging, concretely relates to rolling cutting device of super-huge bearing forging.
Background
With the needs of national economic construction and economic development, the market prospect of the super-large bearing is very good, and the quality of the super-large bearing is required to be higher and higher. The super-huge type bearing forging has large diameter, and the central part of the super-huge type bearing forging has low strength and low mechanical property.
In order to solve the problem of low strength and mechanical property of a central part in the forging process of the super-huge bearing forging, the annular forging is generally cut into an upper part and a lower part by using a lathe or a milling machine in the industry, and then the annular forging is forged. The main problems of the forging method are as follows: the super-huge forge piece is cut into an upper part and a lower part by utilizing a lathe or a milling machine, so that the required working time is greatly consumed, the cutting cost is higher, and the cutting efficiency is low; the inventor develops a rolling cutting device of an oversize bearing forging based on the defects in the prior art, and can well solve the problems in the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve above-mentioned technical problem, provide a rolling cutting device of super-huge bearing forging, its structural design is simple, scientific and reasonable, can solve and utilize lathe or milling machine to consume man-hour, the cutting with high costs, the problem of inefficiency to super-huge forging cutting. The utility model discloses on the basis of utilizing current ring rolling machine, at the ring rolling cutting die of the special design of the spindle suit of ring rolling machine, hold the arm tightly with the ring rolling machine, drive roller and axial cone roller carry out fixed stay to annular super-huge bearing forging, then utilize the drive roller of ring rolling machine and the rotatory extrusion of dabber to roll the super-huge bearing forging of high temperature and make the cutting, can realize carrying out the cutting of making a preliminary roll to super-huge bearing forging, two parts about utilizing lathe or milling machine to cut super-huge bearing forging to forge at last, just so solved and utilized lathe or milling machine to consume super-huge forging cutting man-hour, the cutting cost is high, the problem of inefficiency.
The utility model adopts the technical proposal that: a rolling and cutting device for an extra-large bearing forging comprises a ring rolling machine, a clamping arm, a driving roller, a mandrel and an arm guide roller; the clamping arm is fixedly arranged at the front side and the rear side of a driving roller of the ring rolling machine, the clamping arm is arc-shaped, and an arm guide roller is fixedly arranged at the right side end part of the clamping arm; the driving roller is fixedly arranged at the central position of the clamping arm and is vertically and fixedly connected with a speed reducer and a driving motor of the ring rolling machine; the mandrel is fixedly arranged at the right side of the driving roller, and the mandrel and the driving roller are arranged in a bilateral symmetry manner; the pressing arm is fixedly arranged at the left side position of the ring rolling machine, the pressing arm is fixedly connected with the sliding frame of the ring rolling machine, and the upper position of the pressing arm is fixedly provided with a pressing part; the axial conical roller is fixedly arranged at the right side position of the ring rolling machine and freely slides left and right on a rack of the ring rolling machine; the rolling cutting die is sleeved on the mandrel and is pressed and fixed by the pressing part of the pressing arm; the rolling cutting die comprises an inner cylinder, the inner cylinder is a hollow cylinder, and the outer wall of the inner cylinder is provided with an outer thread of the inner cylinder through the whole body; the limiting bottom plate is fixedly arranged at the bottom of the inner cylinder and is fixedly connected with the inner cylinder into a whole; the die body is in a hollow cylindrical shape, a left V-shaped bulge is fixedly arranged at the left side of the die body, a right V-shaped bulge is fixedly arranged at the right side of the die body, and the left V-shaped bulge and the right V-shaped bulge are horizontally arranged in a bilateral symmetry manner; the fixed connection part of the left V-shaped bulge and the right V-shaped bulge and the die body is in arc connection; the limiting convex ring is provided with a through hole in the center, the inner wall of the through hole is provided with a limiting convex ring internal thread through the whole body, and the limiting convex ring is sleeved at the upper part of the die body through the internal thread of the through hole in a screwing manner; the fixed pressing cover is fixedly arranged at the upper part of the limiting convex ring.
The pressing arm and the mandrel are fixedly arranged on a sliding frame of the ring rolling machine, and a distance for adjusting the contact interval between the driving roller and the mandrel is arranged between the pressing arm and the mandrel; the compressing part of the compressing arm is correspondingly matched with the mandrel for use, and the compressing part is hollow cylindrical.
The pressing arm is driven by a hydraulic cylinder of the ring rolling machine to lift up and down or descend at the upper position of the mandrel.
The limiting convex ring is matched with the inner barrel external thread of the inner barrel through a limiting convex ring internal thread in the limiting convex ring through hole on the inner barrel, and the up-down position adjustment on the inner barrel is realized.
The fixed pressing cover comprises an annular boss which is fixedly arranged at the upper part of the tightening bolt, and the annular boss and the tightening bolt are fixedly connected into a whole; the thread fixing is arranged on the surface of the tightening bolt, and the tightening clamping grooves are symmetrically arranged on the side wall of the annular convex ring in the front-back direction.
The use process of the rolling cutting device for the super-large bearing forging piece is as follows: firstly, adjusting the distance between a mandrel and a driving roller through the mandrel of a ring rolling machine and a sliding frame of a pressing arm, so that a high-temperature ferrule forging to be rolled can be tightly placed between the driving roller and the mandrel, and the ferrule forging is tightly contacted with a die body of a rolling cutting die; meanwhile, the position of the axial conical roller is adjusted, so that the axial conical roller clamps the right part of the ferrule forging, and the axial conical roller plays a role in supporting the ferrule forging at the moment; then, opening a hydraulic cylinder of the clamping arm to enable the clamping arm to tightly clamp the ferrule forging, and enabling an arm guide roller of the clamping arm to be in close contact with the outer wall of the ferrule forging; at the moment, a motor and a speed reducer of a driving roller of the ring rolling machine are started to enable the driving roller to rotate clockwise, and a driving motor of a mandrel is started to enable the mandrel to rotate anticlockwise, so that the left V-shaped bulge and the right V-shaped bulge of the rolling cutting die are in contact with the inner side surface of the bearing forging piece for rolling cutting through the combined action of the clamping arm, the driving roller, the mandrel, the pressing arm and the axial conical roller, and a V-shaped opening required by the bearing forging piece is rolled and cut; the process is the using process of the rolling cutting device for the super-large bearing forging.
The installation method of the rolling cutting die of the rolling cutting device of the super-huge type bearing forging piece comprises the following steps: step one, installation of a die body: firstly, a limiting bottom plate and an inner cylinder are fixedly connected into a whole, then a through hole of a die body is aligned with the inner cylinder, and the die body is screwed to the upper part of the limiting bottom plate by utilizing the occlusion and screwing of the internal thread of the through hole of the die body and the external thread of the inner cylinder; step two, installing a limiting convex ring: after the die body in the step one is installed, aligning the through hole of the limiting convex ring with the inner cylinder, and utilizing the inner thread of the limiting convex ring in the through hole of the limiting convex ring to be meshed and screwed with the outer thread of the inner cylinder so as to screw the limiting convex ring until the limiting convex ring is tightly contacted with the die body; step three, fixing the installation of the pressing cover: after the limiting convex ring in the step two is installed, the screwing bolt for fixing the pressing cover is aligned to the upper central through hole of the limiting convex ring, then the screwing clamping groove on the annular boss is clamped by the wrench to perform screwing action, and the limiting convex ring is fixed firmly by meshing and screwing the threads on the screwing bolt and the internal threads of the limiting convex ring in the limiting convex ring through hole.
The clamping arm is fixedly arranged at the front side and the rear side of a driving roller of the ring rolling machine, the clamping arm is arc-shaped, and an arm guide roller is fixedly arranged at the right side end of the clamping arm; the clamping arm is arranged to fix the front position and the rear position of the super-large bearing forging piece so as to prevent the super-large bearing forging piece from deviating; so as to avoid influencing the rolling cutting precision of the super-huge type bearing forging.
The driving roller is fixedly arranged at the central position of the clamping arm and is vertically and fixedly connected with a speed reducer and a driving motor of the ring rolling machine; the mandrel is fixedly arranged at the right side of the driving roller, and the mandrel and the driving roller are arranged in a bilateral symmetry manner; the main purpose of the arrangement is to roll and cut the super-large bearing forging under the rotation of the driving roller and the mandrel in opposite directions through the arrangement of the driving roller and the mandrel; therefore, the material of the oversize bearing forging is saved, and the rolling and cutting efficiency of the oversize bearing forging is improved.
The pressing arm is fixedly arranged at the left side position of the ring rolling machine, the pressing arm is fixedly connected with the sliding frame of the ring rolling machine, and the upper position of the pressing arm is fixedly provided with a pressing part; the rolling cutting die is fixed on the mandrel, so that the axial movement of the bearing forging is prevented when the oversize bearing forging is rolled and cut, and the processing precision of the oversize bearing forging is improved.
The rolling cutting die is sleeved on the mandrel and is pressed and fixed by the pressing part of the pressing arm; the rolling cutting die is a key part for realizing rolling cutting of the super-large bearing forging, and the rolling cutting die is used for rolling and cutting the inner side surface of the super-large bearing forging into a V-shaped opening under the combined action of the clamping arm, the driving roller, the mandrel, the pressing arm and the axial conical roller.
The inner cylinder is a hollow cylinder, and the outer wall of the inner cylinder is provided with inner cylinder external threads through the body; the main purpose of the arrangement is to adjust the upper and lower positions of the die body and the limiting convex ring on the inner cylinder, improve rolling cutting of the super-large bearing forgings with different heights and improve adaptability of the super-large bearing forgings with different heights.
The limiting bottom plate is fixedly arranged at the bottom of the inner cylinder and is fixedly connected with the inner cylinder into a whole; the main purpose of the arrangement is to limit the position of the die body and improve the rolling and cutting precision of the super-large bearing forging on the one hand; on the other hand, the stability of the rolling cutting die can be improved, and the vertical movement of the rolling cutting die in the axial direction is reduced.
The limiting convex ring is provided with a through hole in the center, the inner wall of the through hole is provided with a limiting convex ring internal thread through the whole body, and the limiting convex ring is sleeved at the upper part of the die body through the internal thread of the through hole in a screwing manner; the main purpose of the arrangement is to adjust the height of the limit convex ring according to the super-large bearing forged pieces with different heights by utilizing the free adjustment of the limit convex ring internal thread of the limit convex ring on the upper and lower positions of the inner cylinder.
The die body is manufactured in advance according to the design parameters of the ferrule, and the die body can be freely disassembled in the inner barrel so as to be suitable for the installation of the die bodies with different shapes.
The ring rolling machine is mature and commonly used mechanical equipment in the prior art, the driving power of the ring rolling machine is realized by a motor, and meanwhile, the rolling power of a driving roller is improved by a speed reducer; the hydraulic control system of a ring rolling machine is also a commonly used control system, and is a technology which can be obtained by a person skilled in the art by looking up relevant information and technical documents.
The utility model has the advantages that: the technical scheme provides a rolling cutting device for super-huge type bearing forgings, which is simple in structural design, scientific and reasonable, and can solve the problems of working hour consumption, high cutting cost and low efficiency in cutting the super-huge type forgings by using a lathe or a milling machine; the cutting efficiency of the super-huge type bearing forging is greatly improved, the strength and the mechanical property of the center part of the super-huge type bearing forging are improved, and the cutting cost is reduced.
Drawings
FIG. 1 is a schematic structural view of the ring rolling machine of the present invention;
FIG. 2 is a schematic structural view of the rolling cutting die of the present invention;
the labels in the figure are: 1. the ring rolling machine comprises a ring rolling machine body, 2, a clamping holding arm, 3, a driving roller, 4, a mandrel, 5, a holding arm guide roller, 6, a pressing arm, 7, a pressing part, 8, an axial conical roller, 9, a rolling cutting die, 901, an inner barrel, 902, an inner barrel external thread, 903, a limiting bottom plate, 904, a die body, 9041, a left V-shaped bulge, 9042, a right V-shaped bulge, 905, a limiting convex ring, 906, a limiting convex ring internal thread, 907, a fixed pressing cover, 9071, an annular boss, 9072, a screwing bolt, 9073, a thread, 9074 and a screwing clamping groove.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
As shown in the figure, the utility model adopts the technical scheme that: a rolling cutting device for an oversize bearing forging comprises a ring rolling machine 1, a clamping arm 2, a driving roller 3, a mandrel 4 and an arm guide roller 5; the clamping arm 2 is fixedly arranged at the front side and the rear side of a driving roller 3 of the ring rolling machine 1, the clamping arm 2 is arc-shaped, and an arm guide roller 5 is fixedly arranged at the right side end part of the clamping arm 2; the driving roller 3 is fixedly arranged at the central position of the clamping arm 2, and the driving roller 3 is vertically and fixedly connected with a speed reducer and a driving motor of the ring rolling machine 1; the mandrel 4 is fixedly arranged at the right side of the driving roller 3, and the mandrel 4 and the driving roller 4 are arranged in bilateral symmetry; the pressing arm 6 is fixedly arranged at the left side position of the ring rolling machine 1, the pressing arm 6 is fixedly connected with the sliding frame of the ring rolling machine 1, and the upper position of the pressing arm 6 is fixedly provided with a pressing part 7; the axial conical roller 8 is fixedly arranged at the right side of the ring rolling machine 1, and the axial conical roller 8 freely slides left and right on the frame of the ring rolling machine 1; a rolling cutting die 9 is sleeved on the mandrel 4 and is simultaneously pressed and fixed by a pressing part 7 of a pressing arm 6; the rolling cutting die 9 comprises an inner cylinder 901, the inner cylinder 901 is a hollow cylinder, and an inner cylinder external thread 902 is arranged on the outer wall of the inner cylinder 901 in a whole body; the limiting bottom plate 903 is fixedly arranged at the bottom of the inner cylinder 901, and the limiting bottom plate 903 and the inner cylinder 901 are fixedly connected into a whole; the mold body 904 is provided with a through hole in the center, an inner thread is arranged on the inner wall of the through hole in a through manner, the mold body 904 is screwed on the inner barrel 901 through the inner barrel outer thread 902 of the inner barrel 901, the mold body 904 is hollow and cylindrical, the left V-shaped bulge 9041 is fixedly arranged at the left side position of the mold body 904, the right V-shaped bulge 9042 is fixedly arranged at the right side position of the mold body 904, and the left V-shaped bulge 9041 and the right V-shaped bulge 9042 are horizontally arranged in a bilateral symmetry manner; the fixed connection part of the left V-shaped bulge 9041 and the right V-shaped bulge 9042 with the die body 904 is in arc connection; a through hole is formed in the center of the limiting convex ring 905, a limiting convex ring internal thread 906 is formed in the inner wall of the through hole in a through mode, and the limiting convex ring 905 is sleeved at the upper position of the die body 904 in a screwing mode through the internal thread of the through hole; the fixed pressing cover 907 is fixedly arranged at the upper position of the limiting convex ring 905.
The pressing arm 6 and the mandrel 4 are fixedly arranged on a sliding frame of the ring rolling machine 1, and a distance for adjusting the contact interval between the driving roller 3 and the mandrel 4 is arranged between the pressing arm 6 and the mandrel 4; the pressing portion 7 of the pressing arm 6 is used in cooperation with the mandrel 4, and the pressing portion 7 is hollow and cylindrical.
The pressing arm 6 is driven by a hydraulic cylinder of the ring rolling machine 1 to realize the up-and-down lifting or descending at the upper position of the mandrel 4.
The limiting convex ring 905 is matched with the inner cylinder external thread 902 of the inner cylinder 901 through a limiting convex ring internal thread 906 in the through hole of the limiting convex ring 905 on the inner cylinder 901, so that the up-and-down position adjustment on the inner cylinder 901 is realized.
The fixed pressing cover 907 comprises an annular boss 9071, the annular boss 9071 is fixedly arranged at the upper part of the tightening bolt 9072, and the annular boss 9071 and the tightening bolt 9072 are fixedly connected into a whole; the screw threads 9073 are fixedly arranged on the surface of the tightening bolt 9072, and the tightening clamping grooves 9074 are symmetrically arranged on the side wall of the annular convex ring 9071 in the front-back direction.
The use process of the rolling cutting device for the super-large bearing forging piece is as follows: firstly, the distance between the mandrel 4 and the driving roller 3 is adjusted through the mandrel 4 of the ring rolling machine 1 and the sliding frame of the pressing arm 6, so that a high-temperature ring forging to be rolled can be tightly placed between the driving roller 3 and the mandrel 4, and the ring forging is tightly contacted with the die body 904 of the rolling cutting die 9; meanwhile, the position of the axial tapered roller 8 is adjusted, so that the axial tapered roller 8 clamps the right part of the ferrule forging, and the axial tapered roller 8 plays a supporting role on the ferrule forging at the moment; then, opening a hydraulic cylinder of the clamping arm 2 to enable the clamping arm 2 to tightly hold the ferrule forging, and enabling an arm guide roller 5 of the clamping arm 2 to be in close contact with the outer wall of the ferrule forging; at the moment, a motor and a speed reducer of a driving roller 3 of the ring rolling machine 1 are started to enable the driving roller 3 to rotate clockwise, and meanwhile, a driving motor of a mandrel 4 is started to enable the mandrel 4 to rotate anticlockwise, so that the left V-shaped protrusion 9041 and the right V-shaped protrusion 9042 of the rolling cutting die 9 are in contact with the inner side surface of the bearing forging to be rolled and cut through the combined action of the clamping arm 2, the driving roller 3, the mandrel 4, the pressing arm 6 and the axial conical roller 8, and the V-shaped opening required by the bearing forging is rolled and cut; the process is the using process of the rolling cutting device for the super-large bearing forging.
The installation method of the rolling cutting die of the rolling cutting device of the super-huge type bearing forging piece comprises the following steps: step one, installation of a die body: firstly, a limiting bottom plate 903 and an inner cylinder 901 are fixedly connected into a whole, then a through hole of a die body 904 is aligned with the inner cylinder 901, the through hole internal thread of the die body 904 is meshed and screwed with an inner cylinder external thread 902 of the inner cylinder 901, and the die body 904 is screwed to the upper position of the limiting bottom plate 903; step two, installing a limiting convex ring: after the die body 904 in the first step is installed, aligning a through hole of the limit convex ring 905 with the inner cylinder 901, engaging and screwing a limit convex ring internal thread 906 in the through hole of the limit convex ring 905 with an inner cylinder external thread 902 of the inner cylinder 901, and screwing the limit convex ring 905 until the limit convex ring is tightly contacted with the die body 904; step three, fixing the installation of the pressing cover: after the limit convex ring 905 in the second step is installed, the screwing bolt 9072 of the fixed pressing cover 907 is aligned to the upper central through hole of the limit convex ring 905, then the screwing clamping groove 9704 on the annular boss 9071 is clamped by a wrench to perform screwing action, and the limit convex ring 905 is fixed firmly by engaging and screwing the thread 9073 on the screwing bolt 9072 with the limit convex ring internal thread 906 in the through hole of the limit convex ring 905.
Claims (5)
1. A rolling and cutting device for an extra-large bearing forging comprises a ring rolling machine, a clamping arm, a driving roller, a mandrel and an arm guide roller; the clamping arm is fixedly arranged at the front side and the rear side of a driving roller of the ring rolling machine, the clamping arm is arc-shaped, and an arm guide roller is fixedly arranged at the right side end part of the clamping arm; the driving roller is fixedly arranged at the central position of the clamping arm and is vertically and fixedly connected with a speed reducer and a driving motor of the ring rolling machine; the mandrel is fixedly arranged at the right side of the driving roller, and the mandrel and the driving roller are arranged in a bilateral symmetry manner; the pressing arm is fixedly arranged at the left side position of the ring rolling machine, the pressing arm is fixedly connected with the sliding frame of the ring rolling machine, and the upper position of the pressing arm is fixedly provided with a pressing part; the axial conical roller is fixedly arranged at the right side position of the ring rolling machine and freely slides left and right on a rack of the ring rolling machine; the method is characterized in that: the rolling cutting die is sleeved on the mandrel and is pressed and fixed by the pressing part of the pressing arm; the rolling cutting die comprises an inner cylinder, the inner cylinder is a hollow cylinder, and the outer wall of the inner cylinder is provided with an outer thread of the inner cylinder through the whole body; the limiting bottom plate is fixedly arranged at the bottom of the inner cylinder and is fixedly connected with the inner cylinder into a whole; the die body is in a hollow cylindrical shape, a left V-shaped bulge is fixedly arranged at the left side of the die body, a right V-shaped bulge is fixedly arranged at the right side of the die body, and the left V-shaped bulge and the right V-shaped bulge are horizontally arranged in a bilateral symmetry manner; the fixed connection part of the left V-shaped bulge and the right V-shaped bulge and the die body is in arc connection; the limiting convex ring is provided with a through hole in the center, the inner wall of the through hole is provided with a limiting convex ring internal thread through the whole body, and the limiting convex ring is sleeved at the upper part of the die body through the internal thread of the through hole in a screwing manner; the fixed pressing cover is fixedly arranged at the upper part of the limiting convex ring.
2. The rolling cutting device of an oversize bearing forging of claim 1, characterized in that: the pressing arm and the mandrel are fixedly arranged on a sliding frame of the ring rolling machine, and a distance for adjusting the contact interval between the driving roller and the mandrel is arranged between the pressing arm and the mandrel; the compressing part of the compressing arm is correspondingly matched with the mandrel for use, and the compressing part is hollow cylindrical.
3. The rolling cutting device of an oversize bearing forging of claim 2, characterized in that: the pressing arm is driven by a hydraulic cylinder of the ring rolling machine to realize the up-and-down lifting or descending at the upper part of the mandrel.
4. The rolling cutting device of an oversize bearing forging of claim 1, characterized in that: the limiting convex ring is matched with the inner barrel external thread of the inner barrel through the limiting convex ring internal thread in the limiting convex ring through hole on the inner barrel, and the up-down position adjustment on the inner barrel is realized.
5. The rolling cutting device of an oversize bearing forging of claim 1, characterized in that: the fixed pressing cover comprises an annular boss which is fixedly arranged at the upper part of the tightening bolt, and the annular boss and the tightening bolt are fixedly connected into a whole; the thread fixing is arranged on the surface of the tightening bolt, and the tightening clamping grooves are symmetrically arranged on the side wall of the annular convex ring in the front-back direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920489621.9U CN209830145U (en) | 2019-04-12 | 2019-04-12 | Rolling cutting device of super-huge bearing forging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920489621.9U CN209830145U (en) | 2019-04-12 | 2019-04-12 | Rolling cutting device of super-huge bearing forging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209830145U true CN209830145U (en) | 2019-12-24 |
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ID=68911228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920489621.9U Active CN209830145U (en) | 2019-04-12 | 2019-04-12 | Rolling cutting device of super-huge bearing forging |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209830145U (en) |
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2019
- 2019-04-12 CN CN201920489621.9U patent/CN209830145U/en active Active
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