CN109647921B - Molding cooling device based on air valve - Google Patents
Molding cooling device based on air valve Download PDFInfo
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- CN109647921B CN109647921B CN201811628021.2A CN201811628021A CN109647921B CN 109647921 B CN109647921 B CN 109647921B CN 201811628021 A CN201811628021 A CN 201811628021A CN 109647921 B CN109647921 B CN 109647921B
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- valve
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- pipe
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- extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
- B21C29/003—Cooling or heating of work
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- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention relates to the field of valve forming and processing equipment, and discloses a valve-based forming and cooling device, which comprises a base, wherein a fixed seat and an extrusion head are fixedly connected with each other and are arranged on the base in a sliding manner, and the extrusion head is positioned above the fixed seat; the fixing seat is in a groove shape, a fixing plate is fixedly connected in the fixing seat, and the fixing plate divides the fixing seat into an extrusion groove at the upper part and a water storage cavity at the lower part; the fixed plate is provided with a plurality of through holes and drain holes, the through holes and the drain holes are communicated with the extrusion groove and the water storage cavity, the floating plate is arranged in the water storage cavity in a sliding mode, a plurality of insertion holes are formed in the floating plate and are opposite to the through holes one by one, and the extrusion groove is connected with a water inlet pipe. The invention can solve the problem that water splash is easy to splash when the existing valve cooling equipment is cooled.
Description
Technical Field
The invention relates to the field of valve forming and processing equipment, in particular to a forming and cooling device based on a valve.
Background
The structure of valve is similar to the nail, and its axle cross-sectional shape is roughly T shape, and its shaping manufacturing approach has two kinds usually, one kind is directly to use has the mould that holds the chamber shape the same to pour the shaping directly, its advantage is quick convenient, the shortcoming is that the inside precision of mould requires highly, and the cost is expensive, therefore, another kind of forming means of universal adoption, promptly through carrying out the hot melt to the one end of rod part and extrude its tip and come the shaping, compare in aforementioned method, owing to need to carry out secondary operation to the part for the shaping processing is loaded down with trivial details complicated, but owing to its low cost, also generally received widely used.
In the process of processing the valve by adopting a hot-melting extrusion forming mode, because the part is formed by extrusion through high-temperature melting, the extruded part has higher temperature, and in order to prevent the part from scalding workers, the part needs to be cooled. At present, the cooling treatment mode of the air valve is mainly that the air valve is fixed on a rotating shaft, the air valve synchronously rotates by utilizing the rotation of the rotating shaft and is cooled by comprehensively contacting with cooling water, but the air valve is in a rotating state in the cooling process, and the cooling water is easily thrown away under the action of centrifugal force, so that water splash is caused, the processing environment is influenced, and the air valve is not convenient to use.
Disclosure of Invention
The invention aims to provide a forming cooling device based on an air valve, and the forming cooling device is used for solving the problem that water splash is easy to splash when the existing air valve cooling equipment is used for cooling treatment.
In order to achieve the purpose, the invention adopts the following technical scheme: a molding cooling device based on an air valve comprises a base, wherein a fixed seat and an extrusion head are fixedly connected with each other and are arranged on the base in a sliding manner, and the extrusion head is positioned above the fixed seat; the fixing seat is in a groove shape, a fixing plate is fixedly connected in the fixing seat, and the fixing plate divides the fixing seat into an extrusion groove at the upper part and a water storage cavity at the lower part; the fixed plate is provided with a plurality of through holes and drain holes, the through holes and the drain holes are communicated with the extrusion groove and the water storage cavity, the floating plate is arranged in the water storage cavity in a sliding mode, a plurality of insertion holes are formed in the floating plate and are opposite to the through holes one by one, and the extrusion groove is connected with a water inlet pipe.
The principle and the advantages of the scheme are as follows: the extrusion head is used for carrying out extrusion processing to the part, and the fixing base is used for fixed part of treating processing, and the part passes the perforation on the fixed plate and installs with the jack on the kickboard during processing, and perforation and jack carry out spacing fixed respectively to the both ends of part, avoid the part askew inclined condition to appear when receiving the extrusion effort, guarantee air valve's shaping quality. The extrusion groove and the water storage cavity are used for cooling the formed part to reduce the temperature of the valve, after extrusion forming is completed, the water inlet pipe enters water into the extrusion groove to cool the extruded part on the valve, so that the extruded part is quickly cooled and solidified, the forming effect of the valve is ensured, the end part of the extruded part is flat at the moment to completely seal the through hole, water in the extrusion groove is discharged into the water storage cavity through the water discharge hole, the water storage cavity stores water to enable the liquid level to rise, the floating plate rises along with the liquid level under the action of buoyancy to jack the extruded valve, the valve is pushed out of the fixed seat, after the flat part extruded on the valve is far away from the through hole, the through hole loses the blockage of the flat part of the valve and is opened, and part of water in the extrusion groove flows into the cavity through a gap between the through hole and the rod body of the valve, thereby effectively cooling the rod body part of the valve in the flowing process.
The invention has the advantages that:
1. through intaking to the extrusion groove and realizing the cooling by the extrusion position to the valve, compare and directly drive the valve through the rotation axis and rotate and spray the cooling, need not to reduce the velocity of flow of water on the one hand, water consumption when having reduced the cooling, resources are saved, on the other hand can effectively avoid the valve rotation and make the problem that the cooling water splashes, has guaranteed the clean and tidy of processing environment.
2. The floating plate floats upwards by water entering the water storage cavity through the drainage hole, so that the valve which is formed and machined is pushed upwards, and the machined valve is automatically separated from the water storage cavity, so that the machined valve is taken down.
3. The kickboard makes the valve shift up the time, opens the perforation and makes the extrusion groove by perforating to the intracavity of retaining intaking, and water flows along the valve body of rod when perforating, and effectively cools off valve body of rod position, has guaranteed the cooling effect to valve, improves the production processingquality of product.
Preferably, as an improvement, the wash port all is connected with the drain pipe, and the drain pipe is located the retaining intracavity, and is equipped with a plurality of evenly distributed's hole for water spraying on the drain pipe. When water flows into the water storage cavity through the drain hole, the water is sprayed to the rod body part of the valve beside through the drain pipe through the water spray hole on the drain pipe, so that different parts of the rod body on the valve can be cooled, the valve can be cooled comprehensively, and the cooling effect of the valve is improved.
Preferably, as a modification, the drain holes and the perforations are alternately arranged in sequence. The drain holes and the through holes are alternately arranged, so that the peripheral sides of the parts are provided with the drain holes and the drain pipes correspondingly connected with the drain holes, the parts can be subjected to water spray cooling treatment in multiple directions through the water spray holes in the drain pipes, the cooling effect on the air valve is further enhanced, and the air valve is comprehensively cooled.
Preferably, as an improvement, the hole walls of the insertion holes are provided with elastic inflatable interlayers which are connected with inflation tubes, and one ends of the inflation tubes, far away from the inflatable interlayers, are connected with air sources. The inflatable interlayer can expand and clamp the part when being inflated, so that the fixing effect on the part is enhanced, the part is prevented from being inclined, and the extrusion forming quality of the valve is ensured. And the floating force borne by the floating plate can be increased after the inflatable interlayer is inflated, so that the floating plate can float upwards to push the air valve out of the fixed seat.
Preferably, as an improvement, the base is connected with a rack in a sliding manner, the rack is fixedly connected to the extrusion head, the base is further provided with a gear meshed with the rack in a rotating manner, the air source comprises an air box arranged on the base, a fan is arranged in the air box in a rotating manner, a rotating shaft of the fan penetrates out of the air box and is connected with a gear belt, and one end, far away from the inflation interlayer, of the inflation tube is communicated with the air box. When the extrusion head slides on the base, the gear can be pushed to rotate through the rack, the gear drives the fan connected with the belt to rotate so as to enable airflow in the air box to flow, the airflow enters the inflation interlayer through the inflation pipe, and then the inflation interlayer expands during extrusion forming and automatically clamps and fixes parts so as to guarantee the extrusion forming processing quality.
Preferably, as an improvement, the water inlet pipe is provided with a control valve, the control valve comprises a branch pipe communicated with the lower part of the water inlet pipe, a ball is arranged in the branch pipe, the branch pipe is connected with an airflow pipe, a piston is arranged in the airflow pipe in a sliding mode, and a push rod is connected between the piston and the extrusion head. The control valve is used for controlling the water inlet pipe to intake in the extrusion groove, when the extrusion head slides and is close to the fixed seat, the extrusion head pushes the piston to move through the push rod to extrude the gas in the gas flow pipe, the pressure in the gas flow pipe is increased to push the blocking ball to enter the water inlet pipe, so that the blocking ball blocks the water inlet pipe, and the water inlet pipe is prevented from intaking in the extrusion groove in the extrusion forming process to damage the forming effect of the air valve. After the extrusion of accomplishing gas gate, the fixing base removal is kept away from to the extrusion head, and the extrusion head drives piston reverse motion through the push rod and makes the intraductal pressure of air current reduce this moment, and stifled ball falls into again in the bronchus under the action of gravity to open the inlet tube, make the inlet tube to the braking intake of extrusion inslot and carry out automatically cooling to the valve after accomplishing the processing, so, realize the automatic start-stop of inlet tube, the in-service machining of being convenient for is used.
Preferably, as an improvement, a fixing rod extending along the axial direction of the branch pipe is arranged in the water inlet pipe, and the blocking ball penetrates through the fixing rod and can slide on the fixing rod. In can pushing the inlet tube smoothly with stifled ball in order to guarantee the air current pipe, the preferred plastics material of stifled ball to the gravity that comes from stifled ball that need overcome when reducing the air current and promoting stifled ball, but behind the plastics ball entering inlet tube, is washed away under the impact of rivers easily, and the dead lever that sets up can be used for spacing stifled ball, prevents that stifled ball from being washed away by the water-washed and the skew of emergence position, guarantees the shutoff effect of stifled ball to the inlet tube.
Drawings
FIG. 1 is a partial cross-sectional view of an embodiment of the present invention.
Fig. 2 is an enlarged view of a portion a in fig. 1.
Fig. 3 is an enlarged view of a portion B in fig. 1.
Fig. 4 is a view showing a state where the ball stopper and the fixing bar are connected.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the device comprises a base 1, a fixed seat 2, an extrusion head 3, a fixed plate 4, an extrusion groove 5, a water storage cavity 6, a floating plate 7, a jack 8, an inflation interlayer 9, an inflation pipe 10, a through hole 11, a drain pipe 12, a water spray hole 13, a water inlet pipe 14, a branch pipe 15, a blocking ball 16, an airflow pipe 17, a piston 18, a push rod 19, a fixed rod 20, a rack 21, a gear 22, an air box 23, a fan 24 and parts 25.
The embodiment example is shown in figure 1: the utility model provides a shaping cooling device based on valve, includes the base 1 of U-shaped, sliding connection has extrusion head 3 between the left side board of base 1 and the right side board, and extrusion head 3 is connected with the cylinder, and cylinder drive extrusion head 3 is reciprocal on base 1 and is slided from top to bottom. The sliding connection mode between the extrusion head 3 and the base 1 is as follows: all be equipped with vertical spout on the left side board of base 1 and right side board, all be equipped with the card ball at extrusion head 3's left end and right-hand member, in spout on the left side board and the spout on the right side board are gone into respectively to two card balls to make extrusion head 3 can follow the vertical slip of spout and can't break away from base 1. The extrusion head 3 is positioned right above the fixed seat 2.
A groove-shaped fixing seat 2 is fixedly installed on a bottom plate of the base 1 through bolts, a fixing plate 4 which is horizontally arranged is fixedly connected in the fixing seat 2 through screws, and the fixing plate 4 divides the fixing seat 2 into an extrusion groove 5 on the upper portion and a water storage cavity 6 on the lower portion. Referring to fig. 2, a plurality of through holes 11 and drain holes are formed in the fixing plate 4, the through holes 11 and the drain holes are sequentially and alternately arranged, the extrusion groove 5 and the water storage cavity 6 are communicated with the through holes 11 and the drain holes, the drain holes are connected with a drain pipe 12 vertically arranged in a threaded manner, the drain pipe 12 is located in the water storage cavity 6, a plurality of uniformly distributed water spray holes 13 are formed in the drain pipe 12, and the water spray holes 13 face four directions, namely the front direction, the rear direction, the left direction and the right direction of the drain pipe 12 respectively and are used for cooling the parts 25 on the.
The right part of the extrusion groove 5 is connected with a water inlet pipe 14, and a water valve is arranged on the water inlet pipe 14. Be equipped with the control valve on inlet tube 14, the control valve includes the branch pipe 15 with inlet tube 14 lower part intercommunication, is equipped with stifled ball 16 in the branch pipe 15, and branch pipe 15 is connected with the air current pipe 17 of U-shaped, and the left end of air current pipe 17 communicates with branch pipe 15, slides in the right-hand member and is equipped with piston 18, is connected with push rod 19 between piston 18 and the extrusion head 3, and bolt fastening is passed through respectively at piston 18 and extrusion head 3 at the both ends of push rod 19. Referring to fig. 4, a vertical fixing rod 20 is disposed in the water inlet pipe 14, the upper end of the fixing rod 20 is welded to the water inlet pipe 14, the lower end of the fixing rod 20 is welded to the branch pipe 15, and the ball 16 is disposed on the fixing rod 20 and can slide on the fixing rod 20.
The water storage cavity 6 is provided with a liquid discharge pipe which is provided with a valve. The water storage cavity 6 is internally provided with a floating plate 7 which is horizontally arranged in a sliding way, and the sliding connection mode between the floating plate 7 and the water storage cavity 6 is the same as that between the extrusion head 3 and the base 1, which is not described in detail herein. The two ends of the floating plate 7 are hollowed out, so that the water entering the water storage cavity 6 leaks to the lower part of the floating plate 7 conveniently to enable the floating plate 7 to float. Referring to fig. 3, a plurality of insertion holes 8 are formed in the floating plate 7, the insertion holes 8 are aligned with the through holes 11 one by one, elastic inflatable interlayers 9 are arranged on the hole walls of the insertion holes 8, the inflatable interlayers 9 in the embodiment are all made of silica gel, the inflatable interlayers 9 are all connected with an inflation tube 10 and an deflation tube, an deflation valve is arranged on the deflation tube, and one end, away from the inflatable interlayer 9, of the inflation tube 10 is connected with an air source.
The air source comprises an air box 23 arranged on the base 1, and one end of the inflation tube 10 far away from the inflation interlayer 9 is communicated with the air box 23. The air box 23 is provided with a fan 24 inside through a bearing in a rotating way, and the rotating shaft of the fan 24 penetrates out of the air box 23. The base 1 is connected with a rack 21 in a sliding mode, the rack 21 is fixed on the extrusion head 3 through bolts, a gear 22 meshed with the rack 21 is further arranged on the base 1 in a rotating mode through a bearing, and the gear 22 is connected with a rotating shaft belt of a fan 24.
The specific implementation process is as follows:
after one end of a rod-shaped part 25 to be processed is heated, the heated end of the part 25 faces upwards, the other end of the part faces downwards and is sequentially inserted into the through hole 11 and the insertion hole 8, the through hole 11 and the insertion hole 8 are used for limiting and fixing the two ends of the part 25 respectively, the part 25 is prevented from being inclined, the forming quality of the air valve is guaranteed, and after the part 25 is placed, the heated part of the part 25 is located in the extrusion groove 5. And there is a gap between the face of the part 25 and the wall of the bore 11.
And starting the air cylinder, wherein the air cylinder pushes the extrusion head 3 to slide downwards on the base 1 to be close to the fixed seat 2. The water valve on the water inlet pipe 14 is opened, but when the extrusion head 3 slides downwards, the push rod 19 pushes the piston 18 to slide downwards in the airflow pipe 17, so that the pressure in the airflow pipe 17 is increased, and the blocking ball 16 is pushed into the water inlet pipe 14 under the action of the pressure to block the water inlet pipe 14, so that the water inlet pipe 14 cannot enter the extrusion groove 5 at the moment. The dead lever 20 leads the motion of stifled ball 16, carries on spacingly to stifled ball 16 simultaneously, prevents that stifled ball 16 from receiving the impact of water and taking place the skew, guarantees the shutoff effect of stifled ball 16 to inlet tube 14.
When extrusion head 3 moved down, rack 21 followed extrusion head 3 and moved down, rack 21 promoted the meshing gear 22 rotatory, gear 22 drives the fan 24 rotation that the belt is connected, and the air current in bellows 23 flows fast under fan 24's effect and enters into in aerifing interlayer 9 via gas tube 10, aerifys interlayer 9 this moment and aerifys and expand to the center of jack 8 to hold the lower extreme of part 25 tightly fixedly, keep the stability of part 25, and then guarantee the extrusion effect of part 25. In order to ensure the inflation effect of the inflatable interlayer 9, a negative pressure fan is connected to the inflation tube 10 and is used for sucking airflow into the inflatable interlayer 9.
After the extrusion forming of the air valve is completed, the air cylinder drives the extrusion head 3 to move upwards and far away from the fixed seat 2, at the moment, the extrusion head 3 drives the piston 18 to slide upwards in the airflow pipe 17 through the push rod 19, the air pressure in the airflow pipe 17 is reduced, the blocking ball 16 slides downwards under the action of gravity to fall back into the branch pipe 15 and block the branch pipe 15, and at the moment, the water inlet pipe 14 is opened and water enters the extrusion groove 5. The ball 16 seals off the branch pipe 15 from water entering the gas flow pipe 17.
After the water enters the extrusion groove 5, the water flow is sprayed on the flat part of the valve which is extruded and formed, and the flat part of the valve is cooled, so that the temperature of the valve is reduced, the valve is quickly hardened, and the forming effect of the valve is ensured. By adopting the cooling mode, the problem that cooling water splashes everywhere can be effectively avoided, and the neatness of the processing environment is kept.
At this moment, because the flat part of the valve after being extruded blocks the through hole 11, water can not flow into the water storage cavity 6 through the through hole 11, but enters the drain pipe 12 through the drain hole, and is sprayed out to the valve at the side through the water spraying hole 13 on the drain pipe 12, and the rod body part of the valve is cooled, so that the comprehensive cooling effect of the valve is ensured, and the subsequent collection and processing of the valve are facilitated.
After water enters the water storage cavity 6, the water leaks downwards along the hollowed-out part of the floating plate 7 and is deposited at the bottom of the water storage cavity 6, the liquid level in the water storage cavity 6 rises at the moment, the floating plate 7 floats upwards along the liquid level under the action of buoyancy, and the inflatable interlayer 9 is in an inflatable state at the moment and increases the buoyancy of the floating plate 7, so that the floating plate 7 can smoothly float. The floating plate 7 floats upwards and drives the air valve to move upwards, so that the air valve is separated from the water storage cavity 6, and the air valve after being processed and cooled is taken out conveniently. And in the process of moving the valve upwards, after the flat part of the valve is far away from the through hole 11, the gap between the through hole 11 and the rod body part of the valve is opened, part of water in the extrusion groove 5 flows downwards into the water storage cavity 6 through the gap, and in the flowing process, the rod body part of the valve is intensively cooled, so that the cooling effect on the valve is further enhanced.
When the floating plate 7 floats to the lower part of the fixed plate 4 and is abutted against the fixed plate 4, the floating plate 7 cannot move continuously, and the air valve is kept stable in the extrusion groove 5 at the moment so as to be convenient for an operator to take down the air valve.
After the air valve is taken down, the air release valve on the air release pipe connected with the inflatable interlayer 9 is opened, and the inflatable interlayer 9 is deflated to be used for forming and fixing the next batch of parts 25. At the same time, the valve on the liquid discharge pipe connected with the water storage cavity 6 is opened to discharge water to the water storage cavity 6, so that the floating plate 7 is sunk at the bottom of the water storage cavity 6 to be used for processing the next batch of parts 25.
The foregoing is merely an example of the present invention and common general knowledge in the art of designing and/or characterizing particular aspects and/or features is not described in any greater detail herein. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several variations and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (7)
1. The utility model provides a shaping cooling device based on valve, includes the base, its characterized in that: the base is provided with a fixed seat and an extrusion head which are fixedly connected, and the extrusion head is positioned above the fixed seat; the fixing seat is in a groove shape, a fixing plate is fixedly connected in the fixing seat, and the fixing plate divides the fixing seat into an extrusion groove at the upper part and a water storage cavity at the lower part; the water storage device is characterized in that the fixing plate is provided with a plurality of through holes and drain holes, the through holes and the drain holes are communicated with the extrusion groove and the water storage cavity, the water storage cavity is internally and slidably provided with a floating plate, the floating plate is provided with a plurality of insertion holes, the insertion holes are opposite to the through holes one by one, and the extrusion groove is connected with a water inlet pipe.
2. The valve-based forming cooling device of claim 1, wherein: the drain hole all is connected with the drain pipe, and the drain pipe is located the retaining intracavity, and is equipped with a plurality of evenly distributed's hole for water spraying on the drain pipe.
3. The valve-based forming cooling device of claim 2, wherein: the drain holes and the through holes are alternately arranged in sequence.
4. The valve-based forming cooling device of claim 1, wherein: the hole wall of each jack is provided with an elastic inflatable interlayer, the inflatable interlayers are connected with inflatable tubes, and one ends of the inflatable tubes, which are far away from the inflatable interlayers, are connected with an air source.
5. The gas gate-based mold cooling apparatus of claim 4, wherein: the base is connected with a rack in a sliding mode, the rack is fixedly connected to the extrusion head, a gear meshed with the rack is further arranged on the base in a rotating mode, the air source comprises an air box arranged on the base, a fan is arranged in the air box in a rotating mode, a rotating shaft of the fan penetrates out of the air box and is connected with a gear belt, and one end, away from the inflating interlayer, of the inflating pipe is communicated with the air box.
6. The valve-based forming cooling device of claim 1, wherein: the water inlet pipe is provided with a control valve, the control valve comprises a branch pipe communicated with the lower portion of the water inlet pipe, a blocking ball is arranged in the branch pipe, the branch pipe is connected with an air flow pipe, a piston is arranged in the air flow pipe in a sliding mode, and a push rod is connected between the piston and the extrusion head.
7. The gas gate-based mold cooling apparatus of claim 6, wherein: the water inlet pipe is internally provided with a fixed rod extending along the axial direction of the branch pipe, and the blocking ball penetrates through the fixed rod and can slide on the fixed rod.
Priority Applications (1)
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CN201811628021.2A CN109647921B (en) | 2018-12-28 | 2018-12-28 | Molding cooling device based on air valve |
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CN201811628021.2A CN109647921B (en) | 2018-12-28 | 2018-12-28 | Molding cooling device based on air valve |
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CN109647921A CN109647921A (en) | 2019-04-19 |
CN109647921B true CN109647921B (en) | 2020-04-28 |
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CN201811628021.2A Expired - Fee Related CN109647921B (en) | 2018-12-28 | 2018-12-28 | Molding cooling device based on air valve |
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JP3776622B2 (en) * | 1999-03-25 | 2006-05-17 | 株式会社神戸製鋼所 | Product temperature control method during extrusion quenching |
KR100623348B1 (en) * | 2005-03-08 | 2006-09-13 | 엘에스전선 주식회사 | Cooling apparatus for dies |
CN104789747A (en) * | 2015-03-23 | 2015-07-22 | 肖健 | Engine valve quenching and cooling device |
CN108397272B (en) * | 2018-05-14 | 2023-11-14 | 芜湖钻石航空发动机有限公司 | Exhaust valve cooling device of aviation piston engine |
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Effective date of registration: 20200709 Address after: No.63-2 Xinyou Road, Yinxiang new town, Tuchang Town, Hechuan District, Chongqing Patentee after: Chongqing henglei industry and Trade Co., Ltd Address before: Three village 401520 Chongqing Hechuan town dump Patentee before: CHONGQING JIANDA HENGYI VALVE Co.,Ltd. |
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Granted publication date: 20200428 Termination date: 20201228 |