CN212979164U - PPR pipe extruder cooling water tank - Google Patents

PPR pipe extruder cooling water tank Download PDF

Info

Publication number
CN212979164U
CN212979164U CN202021235045.4U CN202021235045U CN212979164U CN 212979164 U CN212979164 U CN 212979164U CN 202021235045 U CN202021235045 U CN 202021235045U CN 212979164 U CN212979164 U CN 212979164U
Authority
CN
China
Prior art keywords
pipe
box
tubular product
water tank
cooling water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202021235045.4U
Other languages
Chinese (zh)
Inventor
郭勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LIANSU TECHNOLOGY DEVELOPMENT (WUHAN) CO LTD
Original Assignee
LIANSU TECHNOLOGY DEVELOPMENT (WUHAN) CO LTD
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LIANSU TECHNOLOGY DEVELOPMENT (WUHAN) CO LTD filed Critical LIANSU TECHNOLOGY DEVELOPMENT (WUHAN) CO LTD
Priority to CN202021235045.4U priority Critical patent/CN212979164U/en
Application granted granted Critical
Publication of CN212979164U publication Critical patent/CN212979164U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

The utility model provides a PPR tubular product extruder coolant tank, including box and support, on the support was located to the box, be provided with tubular product transport inlet and tubular product transport outlet relatively on the two relative lateral walls of box, the line of tubular product transport inlet and tubular product transport outlet is the tubular product transfer chain, is connected with respectively on the roof of box and intakes mechanism and evacuation mechanism, still is equipped with the wet return in the box, wet return one end connection box below is equipped with return water tank, the other end is located between the roof of box and the tubular product transfer chain. The utility model changes the original spray cooling mode into the soaking cooling mode, prolongs the cooling time of the pipe, fully cools the pipe, effectively improves the cooling speed of the pipe and the extrusion speed of the extruder, and improves the production efficiency; and the water inlet mode and the water return pipeline are changed, the number and the positions of the vacuumizing mechanisms are changed, and the structure of the cooling water tank is integrally simplified.

Description

PPR pipe extruder cooling water tank
Technical Field
The utility model relates to a PPR tubular product cooling device field, more specifically relates to a PPR tubular product extruder coolant tank.
Background
At present, a cooling water tank of a PPR pipe extruder utilizes a spray head in a tank body to spray cooling water to cool a shaped PPR pipe. In summer, the temperature is high, the circulating water in the cooling water tank can not rapidly cool the pipe in a spraying mode, the requirement of the extrusion speed of a main machine of an extruder production line can not be completely met, and the production problem can be solved only by reducing the extrusion speed or increasing the circulating amount of the cooling water, so that the productivity is reduced, and the production cost is increased.
Chinese patent CN100569488 discloses "an apparatus and a process for producing PPR pipes by using a novel core mold and a vacuum cold accumulating box", wherein the claims mention "the pipe extruded by a machine head is cooled by spraying through the vacuum cold accumulating box and then enters cooling water in a water tank for immersion cooling", but chinese patent CN100569488 does not disclose a water tank structure for immersion cooling.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome among the above-mentioned background art circulating water in the cooling water tank through spray the cooling tube material that the mode can not be quick, can not satisfy the host computer extrusion speed requirement of extruder production line completely, only through reducing extrusion speed or increasing cooling water circulation volume etc. and solve production problem to reduce the productivity, increased manufacturing cost's problem, provide a PPR tubular product extruder cooling water tank. The utility model changes the original spray cooling mode into the soaking cooling mode, prolongs the cooling time of the pipe, fully cools the pipe, effectively improves the cooling speed of the pipe and the extrusion speed of the extruder, and improves the production efficiency; and the water inlet mode and the water return pipeline are changed, the number and the positions of the vacuumizing mechanisms are changed, and the structure of the cooling water tank is integrally simplified.
In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides a PPR pipe extruder cooling water tank, includes box and support, the box is located on the support, be provided with tubular product transport inlet and tubular product transport outlet on the two relative lateral walls of box relatively, the line of tubular product transport inlet and tubular product transport outlet is the tubular product transfer chain, be connected with water inlet mechanism on the roof of box, still be equipped with the wet return in the box, wet return one end is connected wet return, the other end that the box below was equipped with are located the roof of box with between the tubular product transfer chain. In this way, the pipe conveying inlet of the cooling water tank is connected with the vacuumizing shaping sleeve of the injection molding machine, the PPR pipe enters the pipe conveying inlet of the cooling water tank after being extruded and molded by the extruder, the PPR pipe runs to the pipe conveying outlet along the pipe conveying line, the water inlet mechanism injects water into the box body, the water level rises all the time, the PPR pipe can be soaked and cooled, and the vacuumizing mechanism is arranged at the top of the box body, so that the phenomenon that the water is pumped out during vacuumizing to influence the vacuum degree and the operation of the vacuum mechanism can be avoided; when the water level rises to a certain height, the water returns to the water return tank from the water return pipe, so that the water quantity in the tank body is prevented from exceeding the limit; according to the technical scheme, the original spray cooling mode is changed into the immersion cooling mode, so that the cooling time of the pipe is prolonged, the pipe is fully cooled, the cooling speed of the pipe and the extrusion speed of an extruder are effectively improved, and the production efficiency is improved; and the water inlet mode and the water return pipeline are changed, the number and the positions of the vacuumizing mechanisms are changed, and the structure of the cooling water tank is integrally simplified.
Further, the mechanism of intaking includes water inlet, inlet tube, intake pump and coolant tank, the water inlet is located on the roof of box, inlet tube one end is connected the water inlet, and the other end is connected the delivery port of intake pump, the mouth that draws water of intake pump is connected coolant tank. Like this, need set up a plurality of shower nozzles on spray cooling device's the water pipe originally, after changing into the formula of soaking cooling, only need a water inlet can, the effect is best when the water inlet is located the top, also can be located the lateral wall and be close to on the position at top.
Furthermore, a vacuumizing mechanism is connected to the top wall of the box body and comprises a vacuumizing port, a vacuumizing pipe and a vacuumizing motor, the vacuumizing port is formed in the top wall of the box body, one end of the vacuumizing pipe is connected with the vacuumizing port, and the other end of the vacuumizing pipe is connected with the vacuumizing motor. Like this, evacuation mechanism evacuation is for the tight sizing sleeve of laminating when PPR tubular product is extruded, and the shaping becomes the product, sets up the evacuation mouth at the box top, generally with a water inlet interval one section distance, from the top evacuation, can not take out the water of the inside.
Further, still be equipped with the tubular product setting sheet in the box, the tubular product setting sheet install in on the bottom inner wall of box, be equipped with the design ring that matches with tubular product on the tubular product setting sheet, the design ring cover is established on the tubular product conveying line. Like this, increase the tubular product design piece, through the out-of-roundness of design ring ability effective control tubular product, reduce the ripples Wen on tubular product surface, guarantee the product quality.
Further, follow in the box the tubular product transfer chain still is provided with a plurality of tubular product and pushes down the mechanism, tubular product pushes down the mechanism and includes chassis and the limit structure that can prevent tubular product come-up, limit structure locates on the chassis, the chassis install in on the bottom inner wall of box. Therefore, the pipe is hollow, so that the pipe can float upwards under the buoyancy of water when being soaked, and the conveying and cooling effects can be influenced; a plurality of pipe pressing mechanisms are additionally arranged, and pipes are pressed through the limiting structures on the pipe pressing mechanisms, so that the pipes are always positioned on a pipe conveying line, the pipes cannot float upwards, and the cooling effect is guaranteed.
Furthermore, the pressing mechanism is further provided with a semicircular ring matched with the pipe, the bottom frame is U-shaped, two side edges of the bottom frame are provided with first sliding grooves perpendicular to the pipe conveying line, sliding parts are connected in the first sliding grooves in a sliding mode, two ends of an opening of the semicircular ring are connected with the sliding parts, two ends of the limiting structure are connected with the sliding parts through connecting pieces arranged on the two ends of the limiting structure, and the connecting pieces are parallel to the first sliding grooves. Like this, the semicircle ring can be matchd with the latter half of tubular product, drags tubular product well, prevents that it from warping, and the slider has the locking function when sliding in first spout, and the high position of semicircle ring can be adjusted to the slider to match the in service behavior of difference.
Furthermore, a second sliding groove which is matched with the sliding piece in a sliding mode is arranged on the connecting piece. Like this, the second spout makes the limit structure of semicircle ring top also can height-adjusting.
Furthermore, limit structure is the U groove gyro wheel, be equipped with the axis of rotation on the U groove gyro wheel, the axis of rotation activity is worn to establish the both sides end of U groove gyro wheel, the axis of rotation with connection piece fixed connection. Like this, the U groove gyro wheel can rotate round the axis of rotation, and the upper surface of matching to tubular product that the U groove gyro wheel can be fine pushes down the effect better to tubular product when moving along the tubular product transfer chain, the U groove gyro wheel receives the friction of tubular product, just can roll, with the frictional force that reduces between the two, prevents tubular product surface scratch.
Furthermore, a transparent water level observation window is further arranged on the top wall of the box body. Like this, increase the water tank observation window, the purpose is for the convenient observation water tank inflow that can directly perceived.
Furthermore, limit structure is made by the plastics material. Like this, because limit structure need be in the aquatic for a long time, need have better anticorrosive effect, the plastics material is fine selection to with tubular product surface contact, can prevent mutual scratch.
Compared with the prior art, the beneficial effects are:
1. according to the technical scheme, the original spray cooling mode is changed into the immersion cooling mode, so that the cooling time of the pipe is prolonged, the pipe is fully cooled, the cooling speed of the pipe and the extrusion speed of an extruder are effectively improved, and the production efficiency is improved; and the water inlet mode and the water return pipeline are changed, the number and the positions of the vacuumizing mechanisms are changed, and the structure of the cooling water tank is integrally simplified.
2. A plurality of pipe pressing mechanisms are additionally arranged along the pipe conveying line, and pipes are pressed through limiting structures on the pipe pressing mechanisms, so that the pipes are always positioned on the pipe conveying line, the pipes cannot float upwards, and the cooling effect is guaranteed.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic structural view of the middle tube stock shaping sheet of the present invention.
Fig. 3 is a schematic structural view of the pipe pressing mechanism of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", "long", "short", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limiting the present patent, and those skilled in the art will understand the specific meaning of the terms according to their specific circumstances.
The technical solution of the present invention is further described in detail by the following specific embodiments in combination with the accompanying drawings:
as shown in fig. 1 to 3, the cooling water tank for the PPR pipe extruder comprises a tank body 1 and a support 2, wherein the tank body 1 is arranged on the support 2, two opposite side walls of the tank body 1 are relatively provided with a pipe conveying inlet 15 and a pipe conveying outlet 14, a pipe conveying line 13 is arranged between the pipe conveying inlet 15 and the pipe conveying outlet 14, a water inlet mechanism and a vacuum pumping mechanism are respectively connected to a top wall of the tank body 1, a water return pipe 9 is further arranged in the tank body 1, one end of the water return pipe 9 is connected to a water return tank 4 arranged below the tank body 1, and the other end of the water return pipe is located between the top wall of the tank body 1 and the pipe conveying line 13; and a transparent water level observation window 7 is also arranged on the top wall of the box body 1.
In this embodiment, the water inlet mechanism includes a water inlet 10, a water inlet pipe, a water inlet pump, and a cooling water tank (the water inlet pipe, the water inlet pump, and the cooling water tank are common technical means, and are not shown in the drawings), the water inlet 10 is disposed on the top wall of the box body 1, one end of the water inlet pipe is connected to the water inlet 10, the other end of the water inlet pipe is connected to a water outlet of the water inlet pump, and a water pumping port of the water inlet pump is connected to the cooling water tank; the vacuumizing mechanism comprises a vacuumizing port 12, a vacuumizing tube and a vacuumizing motor 3, the vacuumizing port 12 is formed in the top wall of the box body 1, one end of the vacuumizing tube is connected with the vacuumizing port 12, and the other end of the vacuumizing tube is connected with the vacuumizing motor 3.
In this embodiment, still be equipped with tubular product design piece 8 in the box 1, tubular product design piece 8 install in on the bottom inner wall of box 1, be equipped with the design ring 801 who matches with tubular product 6 on the tubular product design piece 8, design ring 801 cover is established on the tubular product transfer chain 13.
In this embodiment, a plurality of pipe pressing mechanisms 11 are further arranged in the box body 1 along the pipe conveying line 13, each pipe pressing mechanism 11 includes a bottom frame 101 and a limiting structure 102 capable of preventing the pipe 6 from floating upwards, the limiting structure 102 is arranged on the bottom frame 101, and the bottom frame 101 is mounted on the inner wall of the bottom of the box body 1; the limiting structure 102 is made of a plastic material; the downward pressing mechanism 11 is further provided with a semicircular ring 103 matched with the pipe 6, the bottom frame 101 is U-shaped, two side edges of the bottom frame 101 are respectively provided with a first sliding groove 104 perpendicular to the pipe conveying line 13, the first sliding grooves 104 are respectively connected with a sliding piece 105 in a sliding manner, two open ends of the semicircular ring 103 are connected with the sliding pieces 105, two ends of the limiting structure 102 are connected with the sliding pieces 105 through connecting pieces 106, and the connecting pieces 106 are parallel to the first sliding grooves 104; the connecting piece 106 is provided with a second sliding groove 108 which is in sliding fit with the sliding piece 105; the limiting structure 102 is a U-groove roller, a rotating shaft 107 is arranged on the U-groove roller, the rotating shaft 107 penetrates through two side ends of the U-groove roller in a movable mode, and the rotating shaft 107 is fixedly connected with the connecting sheet 106.
In this embodiment, the vacuum pumping mechanism is used for tightly adhering the sizing sleeve when the PPR pipe 6 is extruded, the PPR pipe is formed into a product, the vacuum pumping port 12 is arranged at the top of the box body 1, and is generally spaced from the water inlet 10 by a certain distance, so that the top is vacuumized, and water inside the box body is not pumped out. Increase tubular product design piece 8, through design ring 801 can effectively control the out-of-roundness of tubular product 6, reduce the ripples Wen on tubular product 6 surface, guarantee the product quality.
Because the pipe 6 is hollow, the pipe can float upwards under the buoyancy of water when being soaked, and the conveying and cooling effects can be influenced; a plurality of pipe pressing mechanisms 11 are additionally arranged, and the pipes 6 are pressed through U-groove rollers on the pipe pressing mechanisms, so that the pipes are always positioned on the pipe conveying line 13 and cannot float upwards, and the cooling effect is ensured; the semicircular ring 103 can be matched with the lower half part of the pipe 6 to well drag the pipe 6 and prevent the pipe 6 from deforming, the sliding piece 105 has a locking function when sliding in the first sliding groove 104, and the sliding piece 105 can adjust the height position of the semicircular ring 103 to match different use conditions; the second chute 108 enables the U-groove roller above the semicircular ring 103 to adjust the height; the U groove roller can also rotate around the rotating shaft 107, the U groove roller can be well matched with the upper surface of the pipe 6, the pressing effect is better, and when the pipe 6 moves along the pipe conveying line 13, the U groove roller is rubbed by the pipe 6 and can roll, so that the friction force between the U groove roller and the pipe 6 is reduced, and the pipe 6 is prevented from being scratched on the surface.
In the operation process, a pipe conveying inlet 15 of the cooling water tank is connected with a vacuumizing sizing sleeve 5 of an injection molding machine, a PPR pipe 6 enters the pipe conveying inlet 15 of the cooling water tank after being extruded and molded by an extruder, the PPR pipe 6 runs to a pipe conveying outlet 14 along a pipe conveying line 13, a water inlet mechanism injects water into the box body 1, the water level rises all the time, and the water inflow of the water tank can be visually and conveniently observed through a water tank observation window 7; when the water level rises above the pipe conveying line 13, the PPR pipe can be soaked and cooled, and the vacuumizing mechanism is arranged at the top of the box body 1, so that the phenomenon that the vacuum degree and the operation of the vacuum mechanism are influenced by pumping water out during vacuumizing can be prevented; when the water level rises to a certain height, the water returns to the water return tank 4 from the water return pipe 9, so that the water quantity in the tank body 1 is prevented from exceeding the limit; the embodiment changes the original spray cooling mode into the immersion cooling mode, prolongs the cooling time of the pipe, fully cools the pipe, effectively improves the cooling speed of the pipe and the extrusion speed of the extruder, and improves the production efficiency; and the water inlet mode and the 9 paths of the water return pipe are changed, the number and the positions of the vacuumizing mechanisms are changed, and the structure of the cooling water tank is integrally simplified.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The utility model provides a PPR pipe extruder cooling water tank, includes box (1) and support (2), box (1) is located on support (2), its characterized in that, be provided with tubular product transport inlet (15) and tubular product transport outlet (14) on two relative lateral walls of box (1) relatively, tubular product transport inlet (15) and tubular product transport outlet (14) the line be tubular product transfer chain (13), be connected with into water mechanism on the roof of box (1), still be equipped with wet return (9) in box (1), wet return (9) one end is connected wet return (4), the other end that box (1) below was equipped with are located the roof of box (1) with between tubular product transfer chain (13).
2. The PPR pipe extruder cooling water tank of claim 1, wherein the water inlet mechanism comprises a water inlet (10), a water inlet pipe, a water inlet pump and a cooling water tank, the water inlet (10) is arranged on the top wall of the tank body (1), one end of the water inlet pipe is connected with the water inlet (10), the other end of the water inlet pipe is connected with the water outlet of the water inlet pump, and the water pumping port of the water inlet pump is connected with the cooling water tank.
3. The PPR pipe extruder cooling water tank as claimed in claim 1, wherein a vacuum mechanism is further connected to the top wall of the tank body (1), the vacuum mechanism comprises a vacuum port (12), a vacuum tube and a vacuum motor (3), the vacuum port (12) is opened on the top wall of the tank body (1), one end of the vacuum tube is connected to the vacuum port (12), and the other end of the vacuum tube is connected to the vacuum motor (3).
4. The PPR pipe extruder cooling water tank of claim 1, wherein a pipe shaping sheet (8) is further arranged in the box body (1) near the pipe conveying inlet (15), the pipe shaping sheet (8) is installed on the inner wall of the bottom of the box body (1), a shaping ring (801) matched with a pipe is arranged on the pipe shaping sheet (8), and the shaping ring (801) is sleeved on the pipe conveying line (13).
5. The PPR pipe extruder cooling water tank of claim 1, wherein a plurality of pipe pressing mechanisms (11) are further arranged in the tank body (1) along the pipe conveying line (13), each pipe pressing mechanism (11) comprises a bottom frame (101) and a limiting structure (102) capable of preventing pipes from floating upwards, the limiting structures (102) are arranged on the bottom frames (101), and the bottom frames (101) are mounted on the inner wall of the bottom of the tank body (1).
6. The PPR pipe extruder cooling water tank of claim 5, wherein a semicircular ring (103) matched with the pipe is further arranged on the pipe pressing mechanism (11), the bottom frame (101) is U-shaped, first sliding grooves (104) perpendicular to the pipe conveying line (13) are formed in two side edges of the bottom frame (101), sliding parts (105) are connected in the first sliding grooves (104) in a sliding mode, two ends of an opening of the semicircular ring (103) are connected with the sliding parts (105), two ends of the limiting structure (102) are connected with the sliding parts (105) through connecting pieces (106) arranged in the limiting structure, and the connecting pieces (106) are parallel to the first sliding grooves (104).
7. The PPR pipe extruder cooling water tank as claimed in claim 6, wherein the connecting piece (106) is provided with a second chute (108) which is in sliding fit with the sliding piece (105).
8. The PPR pipe extruder cooling water tank of claim 6 or 7, wherein the limiting structure (102) is a U-groove roller, the U-groove roller is provided with a rotating shaft (107), the rotating shaft (107) movably penetrates through two side ends of the U-groove roller, and the rotating shaft (107) is fixedly connected with the connecting piece (106).
9. The PPR pipe extruder cooling water tank as claimed in claim 1, wherein a transparent water level observation window (7) is further provided on the top wall of the tank body (1).
10. The PPR pipe extruder cooling water tank of any one of claims 5 to 7, wherein the limiting structure (102) is made of plastic material.
CN202021235045.4U 2020-06-24 2020-06-24 PPR pipe extruder cooling water tank Active CN212979164U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021235045.4U CN212979164U (en) 2020-06-24 2020-06-24 PPR pipe extruder cooling water tank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021235045.4U CN212979164U (en) 2020-06-24 2020-06-24 PPR pipe extruder cooling water tank

Publications (1)

Publication Number Publication Date
CN212979164U true CN212979164U (en) 2021-04-16

Family

ID=75424799

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202021235045.4U Active CN212979164U (en) 2020-06-24 2020-06-24 PPR pipe extruder cooling water tank

Country Status (1)

Country Link
CN (1) CN212979164U (en)

Similar Documents

Publication Publication Date Title
CN203172003U (en) Vacuum setting device
CN209063327U (en) A kind of air-drying device on plastic strip surface
CN212979164U (en) PPR pipe extruder cooling water tank
CN210617072U (en) Production cooling structure of reflective membrane
CN210792029U (en) Water cooling device for functional master batch production
CN211842858U (en) Compression roller cooling device of calender for textile production
CN208469179U (en) A kind of modular system for Express Mail Service envelope box gluing machine
CN208247421U (en) The water-cooling system of Wood-plastic floor extrusion moulding
CN208247424U (en) The cooling device of Wood-plastic floor extrusion moulding
CN209007930U (en) A kind of water supplying pipe compound extrusion moulding device
CN208335877U (en) A kind of cable plastic extrusion processing line easy to form
CN205951083U (en) Masterbatch plastic strip cooling trough
CN213321634U (en) Plastic extruder
CN209079006U (en) A kind of cooling water tank
CN216230641U (en) HDPE double-wall corrugated pipe casting forming module
CN212979163U (en) Novel PPR tubular product combination formula coolant tank
CN214820180U (en) Novel special mould for rubber products
CN217944614U (en) Printing roller cooling device
CN220661682U (en) Plastic double-wall corrugated pipe sintering extrusion molding device
CN218314653U (en) Polypropylene film high temperature setting device
CN115972463B (en) Polyimide film tape casting production device and application method thereof
CN220681535U (en) Quick cooling device based on injection molding
CN206416503U (en) Circulating cooling tank
CN214774140U (en) A cooling device for production of PVC pipe
CN219044983U (en) Cooling device for quick forming of polypropylene fiber

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant