CN211307454U - Pultrusion device of carbon fiber rod - Google Patents
Pultrusion device of carbon fiber rod Download PDFInfo
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- CN211307454U CN211307454U CN201921970729.6U CN201921970729U CN211307454U CN 211307454 U CN211307454 U CN 211307454U CN 201921970729 U CN201921970729 U CN 201921970729U CN 211307454 U CN211307454 U CN 211307454U
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Abstract
The utility model relates to a carbon fiber rod pultrusion device, which is provided with a carbon fiber bracket, a guide support, a resin groove, a carbon fiber support frame, a pultrusion die, a traction device and a cutting device, wherein the carbon fiber bracket is provided with a support and a support shaft, the guide support is supported with a guide plate, the resin groove is provided with a heating device, two sides of the resin groove are provided with positioning supports, the resin groove is internally provided with a press-in frame, the discharging groove wall of the resin groove is provided with a resin scraper, the carbon fiber support frame is provided with a carbon fiber support rod, the pultrusion die is provided with an upper die and a lower die, the upper die and the lower die are provided with heating devices, the traction device is provided with a traction support, the traction support is provided with a lower pressure plate and an upper pressure plate, the upper pressure plate is connected with a vertical cylinder, the lower end of the traction support is connected with a horizontal, the lower end of the cutting knife board is connected with a cutter, and the upper end of the cutting knife board is connected with a vertical cylinder.
Description
Technical Field
The utility model relates to a material processing field especially relates to a carbon fiber stick's pultrusion device.
Background
The manufacturing process of the traditional carbon fiber rod is to place the cut carbon fiber cloth into a cloth rolling machine, roll the carbon fiber cloth tightly under the action of the operation and pressure of the cloth rolling machine, place the carbon fiber cloth rolled by the cloth rolling machine into a mould pressing machine, compact the carbon fiber cloth through the mould pressing machine and enable the carbon fiber cloth to be cured and molded under the action of high temperature to form the finished carbon fiber rod.
The carbon fiber rod manufactured by the traditional process has the advantages of low surface smoothness, uncontrollable outer diameter size and uneven finished product density, and the traditional carbon fiber rod manufacturing process is complex, high in manufacturing cost and low in yield.
Disclosure of Invention
The utility model aims at solving the defects of the prior art for manufacturing carbon fiber rods, and providing a carbon fiber rod pultrusion device which can reduce the manufacturing cost, has high output, and can manufacture carbon fiber rods with high surface smoothness, controllable outer diameter and uniform finished product density.
The utility model discloses can reach through following measure.
The utility model provides a pultrusion device of carbon fiber rod, is equipped with carbon filament bracket, guide support, resin groove, carbon filament support frame, pultrusion mould, draw gear, cutting device along the direction of carbon filament motion in proper order, wherein:
the carbon wire bracket is provided with a support and a plurality of support shafts sleeved with carbon wire rolls, the first ends of the support shafts are fixedly connected with the support, the second ends of the support shafts are suspended and provided with limit baffles, and the limit baffles limit the carbon wire rolls through threads;
a guide plate is supported on the guide bracket, and a plurality of guide holes through which the carbon filaments can pass are arrayed on the guide plate;
the resin tank is provided with a heating device, the bottom of the resin tank is provided with a liquid outlet, the liquid outlet is connected with a liquid discharge pipe provided with a control valve, a liquid receiving tank is arranged below the liquid discharge pipe so that resin can be discharged through the liquid outlet, two sides of the resin tank are respectively provided with a positioning bracket, a press-in frame is arranged in the resin tank and comprises an upper fixing rod and a lower pressing rod, two ends of the upper fixing rod are fixed through the positioning brackets, the glue dipping amount and the glue dipping time of the carbon filaments in the resin tank are adjusted through the press-in frame, and a resin scraper blade is arranged on the wall of a discharge tank of the resin tank so that redundant resin is scraped through the resin scraper blade after the carbon filaments;
the carbon filament support frame is provided with a carbon filament support rod, so that the carbon filament enters the pultrusion die through the carbon filament support rod after coming out of the resin tank;
the pultrusion die is provided with an upper die and a lower die, a cylindrical cavity is formed along the motion direction of the carbon wire after the upper die and the lower die are closed, the upper die and the lower die are respectively provided with a heating device, and the carbon wire is solidified to form a cylindrical carbon fiber rod through the pultrusion die under the action of the heating device;
the traction device is provided with a traction support, a lower pressing plate is arranged on the traction support, an upper pressing plate is correspondingly arranged above the lower pressing plate, the upper end of the upper pressing plate is connected with a piston rod of a first vertical air cylinder, the first vertical air cylinder is fixed at the upper end of the traction support, the upper pressing plate and the lower pressing plate are driven to be close to and away from each other through the up-and-down movement of the piston rod of the first vertical air cylinder, the lower end of the traction support is connected with a horizontal sliding shaft through a bearing, the middle part of the lower end of the traction support is connected with a piston rod of a horizontal air cylinder, and;
the cutting device is provided with a base for placing the carbon fiber rods, a cutting knife board is arranged above the base, the lower end of the cutting knife board is connected with a cutter, the upper end of the cutting knife board is connected with a piston rod of a second vertical cylinder, the second vertical cylinder is fixed above the cutting knife board through a cylinder support frame, the upper and lower movement of the piston rod of the second vertical cylinder drives the cutting knife board to be close to and away from the base, and the cutter implements cutting operation on the carbon fiber rods along the direction of motion of the carbon fiber rods perpendicular to the direction of motion.
Pultrusion mould, draw gear and cutting device establish on pultrusion equipment platform along carbon silk direction of motion in proper order.
Go up heating device on mould and the bed die divide into preheating zone, gel district, solidification zone along carbon silk direction of motion in proper order, through the control to preheating zone, gel district, solidification zone temperature, reach the effect of heating, precuring and solidification in advance.
The locating support of resin groove both sides and the frame of impressing in the resin groove be provided with two at least to the area of contact of increase carbon silk and resin.
Draw gear top board and holding down plate on correspond and be equipped with curved face that compresses tightly, be equipped with elastic gasket on the face that compresses tightly to reduce carbon fiber stick's deformation and increase top board and holding down plate and carbon fiber stick's area of contact.
Cutting device base on be equipped with cutter under the V-arrangement, cut off the cutting board lower extreme be connected with the V-arrangement under the cutter assorted down the V-arrangement go up the cutter, go up the cooperation of cutter and lower cutter in order to cut off the carbon fiber stick.
The utility model discloses during the use, the carbon filament is rolled up and is fixed on the carbon filament bracket through the carbon filament back shaft, select stranded carbon filament as required, the carbon filament passes the guide support through the guide hole, under draw gear's traction, the pulling carbon filament gets into the resin groove, the frame of impressing is used for adjusting the gum dipping volume and the gum dipping time of carbon filament in the resin groove, in order to ensure that the carbon filament can be soaked the resin and guarantee curing forming's homogeneity, the carbon filament that has soaked the resin gets into the cavity of pultrusion mould under draw gear's effect and stereotypes, and heat the carbon fiber rod through heating device's temperature control, the solidification, the carbon fiber rod after the heating solidification draws to cutting device department under draw gear's effect, cutting device cuts off the carbon fiber rod that pulls the target in place according to prescribed size, thereby accomplish the production process of whole pultrusion product. Draw gear's theory of operation is on the holding down plate that the carbon fiber stick was introduced and is drawn the support, starting switch, the holding down plate is through the downstream of first perpendicular cylinder piston rod, push down the carbon fiber stick, the holding down plate pushes down behind the carbon fiber stick, horizontal cylinder control draws the support and slides the axle along the level and move forward, drive the carbon fiber stick and move forward, reach the level and slide axle foremost after, first perpendicular cylinder piston rod upward movement drives the holding down plate and loosens the carbon fiber stick, horizontal cylinder drives and draws the support and move backward, draw the carbon fiber stick through the effect that utilizes the cylinder and move.
The utility model has the advantages of realizing streamlined operation, improving working efficiency, saving labor and reducing cost; the carbon filaments firstly pass through the resin tank and are controlled in gum dipping amount and gum dipping time under the action of pressing into the frame, so that the uniformity of the density of a finished product can be ensured; the pultrusion die can be flexibly replaced, and the diameter size of the bar can be adjusted by replacing dies with different sizes; the carbon fiber rod is heated and cured while entering the pultrusion die for molding, and the pultrusion and curing of the carbon fiber rod are realized under the action of the traction device, so that the surface smoothness of the manufactured carbon fiber rod is high.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic structural view of the carbon fiber bracket of the present invention.
Fig. 3 is a schematic view of the structure of the guiding bracket of the present invention.
Fig. 4 is a schematic view of the structure of the resin tank of the present invention.
Fig. 5 is a schematic view of the structure of the press-in frame of the present invention.
Fig. 6 is a schematic view of the structure of the carbon filament support frame of the present invention.
Fig. 7 is a schematic structural view of the pultrusion die of the utility model.
Fig. 8 is the schematic structural diagram of the pultrusion die along the motion direction of the carbon filaments.
Fig. 9 is a schematic structural view of the traction device of the present invention.
Fig. 10 is a schematic structural view of the traction device of the present invention along the moving direction of the carbon filament.
Fig. 11 is a schematic structural view of the cutting device of the present invention.
The symbols in the drawings illustrate that: carbon wire bracket-1, support shaft-101, limit baffle-102, nut-103, bracket-104, guide bracket-2, guide plate-201, guide hole-202, resin tank-3, positioning bracket-301, liquid discharge port-302, liquid discharge pipe-303, control valve-304, liquid receiving tank-305, heating device-306, press-in frame-4, upper fixing rod-401, lower pressing rod-402, pultrusion die-5, upper heating plate-501, lower heating plate-502, preheating zone-51, gel zone-52, curing zone-53, upper die-503, lower die-504, cavity-505, carbon wire support frame-6, traction device-7, traction bracket-701, lower pressing plate-702, An upper pressing plate-703, a first vertical cylinder-704, a horizontal cylinder-705, a horizontal sliding shaft-706, a cutting device-8, a base-801, a cutting knife plate-802, a cutting knife-803, a second vertical cylinder-804, a cylinder supporting frame-805 and a pultrusion equipment platform-9.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in figure 1, the carbon fiber rod pultrusion device is sequentially provided with a carbon fiber bracket 1, a guide support 2, a resin tank 3, a carbon fiber support frame 6, a pultrusion die 5, a traction device 7 and a cutting device 8 along the moving direction of carbon fibers, wherein the pultrusion die 5, the traction device 7 and the cutting device 8 are arranged on a pultrusion equipment platform 9.
As shown in fig. 2, a plurality of support shafts 101 and supports 104 sleeved with carbon wire coils are arranged on the carbon wire bracket 1, a first end of each support shaft 101 is fixedly connected with the corresponding support 104, a second end of each support shaft 101 is suspended, a limit baffle 102 used for fixing the carbon wire coils is arranged on each support shaft 101, the limit baffle 102 can axially move and is supported on the support shafts, a nut 103 is arranged at a second end of each support shaft 101, threads are arranged on the support shafts, and the nuts are matched with the threads to enable the nuts to abut against the limit baffle to limit the carbon wire coils. The two limiting baffles 102 are arranged in the embodiment and located on two sides of the carbon wire coil for limiting the carbon wire coil, the supporting shaft is provided with threads at one end far away from the carbon wire bracket, the nut can just abut against the limiting baffle close to the second end of the supporting shaft through the rotation of the threads, and the gasket is arranged between the nut and the limiting baffles.
As shown in fig. 3, a guide plate 201 is supported on the guide frame 2, and a plurality of guide holes 202 through which the carbon filaments can pass are arranged in an array on the guide plate 201.
As shown in fig. 4 and 5, the resin tank 3 contains resin, the content of the resin is calculated according to the number of carbon filaments and the required strength and temperature of the carbon fiber rod, the resin tank is provided with a heating device 306, the temperature of the resin is adjusted by a heating device 306, a liquid outlet 302 is arranged at the bottom of the resin tank 3, the liquid outlet 302 is connected with a liquid outlet pipe 303 provided with a control valve 304, a liquid receiving tank 305 is arranged below the liquid outlet pipe 303, so that the resin is discharged through the liquid outlet, the groove walls at the two sides of the resin groove are provided with the positioning brackets 301, the resin groove is internally provided with the press-in frame 4, the press-in frame 4 comprises an upper fixing rod 401 and a lower pressing rod 402, the shape of the lower pressing rod in the embodiment is a round pipe shape, the two ends of the upper fixing rod 401 are fixed through the positioning brackets 301, the lower pressing rod 402 extends into the resin groove and is pressed above the carbon filaments, so that the carbon filament can be completely impregnated with resin, and the impregnation amount and the impregnation time of the carbon filament are adjusted by pressing the carbon filament into the frame; the height of the press-in frame in the resin groove can be adjusted, in the embodiment, the height of the press-in frame lower pressing rod in the resin groove is adjusted through the positioning support, and the position of the press-in frame lower pressing rod can also be adjusted through the positioning holes by correspondingly arranging a plurality of positioning holes in sequence on the supports at two sides of the press-in frame. The positioning brackets 301 and the press-in frame 4 on the groove wall of the resin groove 3 are provided in plurality to increase the contact area of the carbon filament with the resin. And a resin scraper (not shown in the figure) is arranged on the discharging groove wall of the resin groove 3, the direction of the resin scraper is parallel to the bottom of the resin groove and extends towards the direction opposite to the moving direction of the carbon filaments, so that the carbon filaments can scrape off redundant resin after coming out of the resin groove through the resin scraper, and the redundant resin slides into the resin groove along the resin groove wall.
As shown in fig. 6, a carbon filament support frame 6 is arranged between the resin tank 3 and the pultrusion die 5, a carbon filament support rod is arranged on the carbon filament support frame 6, and two ends of the carbon filament support rod are connected with the carbon filament support frame, so that the carbon filament can enter the pultrusion die through the carbon filament support rod after coming out of the resin tank, and the carbon filament is prevented from contacting the ground or a pultrusion equipment platform to cause pollution.
As shown in fig. 7 and 8, the pultrusion die 5 is provided with an upper die 503 and a lower die 504, and after the upper die and the lower die are closed, a cylindrical cavity 505 is formed along the motion direction of the carbon wire; an upper heating plate 501 is arranged on an upper die 503 of the pultrusion die 5, a lower heating plate 502 is arranged below a lower die 504, temperature heating devices are arranged on the upper heating plate and the lower heating plate, the upper heating plate and the lower heating plate are sequentially divided into a preheating area 51, a gel area 52 and a curing area 53 along the motion direction of the carbon filament, the three heating areas are different in temperature, the heating, pre-curing and curing effects are achieved through controlling the temperatures of the three heating areas, and a cylindrical cavity formed by combining the upper die and the lower die enables the carbon filament to pass through the pultrusion die and be cured under the heating effects of the upper heating plate and the lower heating plate to form a cylindrical carbon fiber rod.
As shown in fig. 9 and 10, the traction device 7 is provided with a traction support 701, a lower pressing plate 702 is arranged on the traction support 701, upper pressing plates 703 are symmetrically arranged above the lower pressing plate 702, the upper end of the upper pressing plate 703 is connected with a piston rod of a first vertical cylinder 704, the first vertical cylinder 704 is fixed at the upper end of the traction support 701, the upper pressing plate and the lower pressing plate are driven to approach and separate through the up-and-down movement of the first vertical piston rod, the lower end of the traction support is connected with a horizontal sliding shaft 706 through a bearing, the middle part of the lower end of the traction support is connected with a piston rod of a horizontal cylinder 705, and the traction support is driven to move back and forth along the horizontal sliding. Also can correspond on top board and the holding down plate and be equipped with curved face that compresses tightly, compress tightly the face and be equipped with elastic gasket, the carbon fiber stick is located curved face department that compresses tightly when draw gear, and the dynamics is too big when this kind of design can prevent that the top board from pushing down causes the carbon fiber stick to warp to can increase the area of contact of top board and holding down plate and carbon fiber stick, do benefit to and drag the carbon fiber stick antedisplacement under horizontal cylinder's effect.
As shown in fig. 11, the cutting device 8 is provided with a base 801 on which the carbon fiber rod is placed, a cutting blade plate 802 is arranged above the base 801, a cutter 803 is connected to the lower end of the cutting blade plate 802, the upper end of the cutting blade plate 802 is connected to a piston rod of a second vertical cylinder 804, the second vertical cylinder 804 is fixed above the cutting blade plate 802 through a cylinder support frame 805, the cutting blade plate is driven to approach and separate from the base by the up-and-down movement of the piston rod of the second vertical cylinder 804, and the cutter 803 performs a cutting operation on the carbon fiber rod along a direction perpendicular to the movement direction of the carbon fiber rod. The cutting device base can also be provided with a V-shaped lower cutter, the lower end of the cutting knife board is connected with an inverted V-shaped upper cutter matched with the V-shaped lower cutter, and the upper cutter is matched with the lower cutter to cut off the carbon fiber rod.
In this embodiment, the pultrusion die, the traction device and the cutting device are all connected with a controller, and the controller is used for controlling heating, traction, cutting and other operations respectively, and the control mode of the controller can be either CPU control or switch control.
The utility model discloses during the use, the carbon filament is rolled up and is fixed on the carbon filament bracket through the carbon filament back shaft, select stranded carbon filament as required, the carbon filament passes the guide support through the guide hole, under draw gear's traction, the pulling carbon filament gets into the resin groove, the frame of impressing is used for adjusting the gum dipping volume and the gum dipping time of carbon filament in the resin groove, in order to ensure that the carbon filament can be soaked the resin and guarantee curing forming's homogeneity, the carbon filament that has soaked the resin gets into pultrusion die's die cavity under draw gear's effect and stereotypes, go up the hot plate and heat the carbon fiber rod through heating device's temperature control down with lower hot plate, the solidification, the carbon fiber rod after the heating solidification is drawn to cutting device department under draw gear's effect, cutting device cuts off the carbon fiber rod that will pull the target in place according to prescribed size, thereby accomplish the production process of whole pultrusion product. Draw gear's theory of operation is on the holding down plate that the carbon fiber stick was introduced and is drawn the support, starting switch, the holding down plate is through the downstream of first perpendicular cylinder piston rod, push down the carbon fiber stick, the holding down plate pushes down behind the carbon fiber stick, horizontal cylinder control draws the support and slides the axle along the level and move forward, drive the carbon fiber stick and move forward, reach the level and slide axle foremost after, first perpendicular cylinder piston rod upward movement drives the holding down plate and loosens the carbon fiber stick, horizontal cylinder drives and draws the support and move backward, draw the carbon fiber stick through the effect that utilizes the cylinder and move.
The utility model has the advantages of realizing streamlined operation, improving working efficiency, saving labor and reducing cost; the carbon filaments firstly pass through the resin tank and are controlled in gum dipping amount and gum dipping time under the action of pressing into the frame, so that the uniformity of the density of a finished product can be ensured; the pultrusion die can be flexibly replaced, and the diameter size of the bar can be adjusted by replacing dies with different sizes; the carbon fiber rod is heated and cured while entering the pultrusion die for molding, and the pultrusion and curing of the carbon fiber rod are realized under the action of the traction device, so that the surface smoothness of the manufactured carbon fiber rod is high.
Claims (6)
1. The utility model provides a pultrusion device of carbon fiber rod, which is characterized in that: be equipped with carbon silk bracket, guide support, resin groove, carbon silk support frame, pultrusion mould, draw gear, cutting device along the direction that carbon silk moved in proper order, wherein:
the carbon wire bracket is provided with a support and a plurality of support shafts sleeved with carbon wire rolls, the first ends of the support shafts are fixedly connected with the support, the second ends of the support shafts are suspended and provided with limit baffles, and the limit baffles limit the carbon wire rolls through threads;
a guide plate is supported on the guide bracket, and a plurality of guide holes through which the carbon filaments can pass are arrayed on the guide plate;
the resin tank is provided with a heating device, the bottom of the resin tank is provided with a liquid outlet, the liquid outlet is connected with a liquid discharge pipe provided with a control valve, a liquid receiving tank is arranged below the liquid discharge pipe, two sides of the resin tank are respectively provided with a positioning bracket, a press-in frame is arranged in the resin tank, the press-in frame comprises an upper fixing rod and a lower pressing rod, two ends of the upper fixing rod are fixed through the positioning brackets, and a resin scraper is arranged on the discharge tank wall of the resin tank;
the carbon filament support frame is provided with a carbon filament support rod, so that the carbon filament enters the pultrusion die through the carbon filament support rod after coming out of the resin tank;
the pultrusion die is provided with an upper die and a lower die, a cylindrical cavity is formed along the motion direction of the carbon wire after the upper die and the lower die are closed, and heating devices are arranged on the upper die and the lower die;
the traction device is provided with a traction support, a lower pressure plate is arranged on the traction support, an upper pressure plate is correspondingly arranged above the lower pressure plate, the upper end of the upper pressure plate is connected with a piston rod of a first vertical air cylinder, the first vertical air cylinder is fixed at the upper end of the traction support, the lower end of the traction support is connected with a horizontal sliding shaft through a bearing, and the middle part of the lower end of the traction support is connected with a piston rod of a horizontal air cylinder;
the cutting device is provided with a base for placing the carbon fiber rod, a cutting knife board is arranged above the base, the lower end of the cutting knife board is connected with a cutter, the upper end of the cutting knife board is connected with a piston rod of a second vertical cylinder, and the second vertical cylinder is fixed above the cutting knife board through a cylinder support frame.
2. The pultrusion device for carbon fiber rods as claimed in claim 1, characterized in that: the pultrusion die, the traction device and the cutting device are sequentially arranged on the pultrusion equipment platform along the motion direction of the carbon wires.
3. The pultrusion device for carbon fiber rods as claimed in claim 1, characterized in that: and the heating devices on the upper die and the lower die are sequentially divided into a preheating area, a gel area and a curing area along the motion direction of the carbon filaments.
4. The pultrusion device for carbon fiber rods as claimed in claim 1, characterized in that: the positioning supports on two sides of the resin groove and the press-in frames in the resin groove are at least two, so that the contact area between the carbon filaments and the resin is increased.
5. The pultrusion device for carbon fiber rods as claimed in claim 1, characterized in that: the traction device upper pressure plate and the traction device lower pressure plate are correspondingly provided with arc-shaped pressing surfaces, and elastic gaskets are arranged on the pressing surfaces.
6. The pultrusion device for carbon fiber rods as claimed in claim 1, characterized in that: the cutting device is characterized in that a V-shaped lower cutter is arranged on the base of the cutting device, an inverted V-shaped upper cutter matched with the V-shaped lower cutter is connected to the lower end of the cutting knife plate, and the upper cutter and the lower cutter are matched to cut off the carbon fiber rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921970729.6U CN211307454U (en) | 2019-11-14 | 2019-11-14 | Pultrusion device of carbon fiber rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921970729.6U CN211307454U (en) | 2019-11-14 | 2019-11-14 | Pultrusion device of carbon fiber rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211307454U true CN211307454U (en) | 2020-08-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921970729.6U Active CN211307454U (en) | 2019-11-14 | 2019-11-14 | Pultrusion device of carbon fiber rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211307454U (en) |
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2019
- 2019-11-14 CN CN201921970729.6U patent/CN211307454U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A pultrusion device for carbon fiber rod Effective date of registration: 20211230 Granted publication date: 20200821 Pledgee: SHANDONG WEIHAI RURAL COMMERCIAL BANK Co.,Ltd. Pledgor: Weihai and Liyuan Carbon Fiber Technology Co.,Ltd. Registration number: Y2021990001211 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20230411 Granted publication date: 20200821 Pledgee: SHANDONG WEIHAI RURAL COMMERCIAL BANK Co.,Ltd. Pledgor: Weihai and Liyuan Carbon Fiber Technology Co.,Ltd. Registration number: Y2021990001211 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right |