Pressure spraying device for prolonging service life of nodular cast iron pipe cold mold method pipe mold
By using a pressure spraying device to spray the paint at the tube mold bearing end of the ductile iron tube cold mold method, the waste heat of the tube mold is used to dry the tube mold to reduce the thermal and mechanical stress of the inner wall of the tube mold, the problems of tube mold cracking and short service life are solved, and the effect of extending the use time of the tube mold and reducing production costs is achieved.
Patent Information
- Application Number
- CN202421223011.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-05-31
AI Technical Summary
Ductile iron pipe cold mold method pipe mold is prone to cracking during use, resulting in the embedded gap of the cast pipe, difficulty in pulling out the pipe, affecting the production continuity, and reducing the total life of the pipe mold.
A pressure spraying device is designed, including a stirring mechanism, a power mechanism and a spray head mechanism, spray paint at the end of the cold mold pipe mold, and dry the paint using the waste heat of the pipe mold. The paint serves as the isolation layer between the pipe mold and the ball tube to reduce thermal and mechanical stress.
The spraying device extends the usage time of the cold mold method pipe mold, reduces the frequency of replacement, improves production efficiency, extends the total life of the pipe mold, and reduces production costs.
Smart Images
Figure CN222679504U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of centrifugal casting, in particular to a pressure spraying device for prolonging the life of a cold mold pipe mold of a ductile iron pipe. Background Art
[0002] The cold mold method of ductile iron pipe is a process of centrifugal casting. The production of small and medium-sized ductile iron pipes mostly adopts the cold mold method. Specifically, molten iron is directly poured into the pipe mold, the molten iron is in direct contact with the inner wall of the pipe mold, the outer wall of the pipe mold is sprayed and cooled, the cast pipe is pulled out after forming, and the next one is cast. In this process, the inner wall of the cold mold pipe mold is in direct contact with the molten iron, and the outer surface is in direct contact with the cooling water. The inner wall of the pipe mold is cyclically subjected to high temperature stress and mechanical stress, and the inner wall of the pipe mold is prone to cracking, especially the socket position of the inner wall of the pipe mold. The pipe mold cracks, the cast pipe is embedded in the gap, and it is difficult to pull out the pipe, which affects the continuity of production; replacing the pipe mold affects the output during the shift; the accumulation of fatigue damage will also reduce the total life of the pipe mold. Therefore, in order to reduce production costs and effectively maintain the orderly progress of production, a device that can effectively extend the life of the pipe mold is urgently needed. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a pressure spraying device for extending the life of the cold mold pipe mold of ductile iron pipe. In the casting gap, the device can be used to spray paint on the socket end of the cold mold pipe mold, and the paint is dried by the residual heat of the pipe mold. The paint serves as an isolation layer between the pipe mold and the spherical pipe, reducing the thermal stress and mechanical stress of the inner wall of the pipe mold.
[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a pressure spraying device for extending the life of a ductile iron pipe cold mold method, comprising a stirring mechanism, a power mechanism and a nozzle mechanism, the discharge port of the stirring mechanism is connected to the feed port of a high-pressure air type power mechanism, a high-pressure air inlet is arranged on the power mechanism, a material pipe is connected to the bottom of the power mechanism, a rotatable nozzle mechanism is connected to the material pipe, the nozzle mechanism comprises a fan-shaped nozzle connected to the material pipe, and the fan-shaped nozzle is also connected to the high-pressure air inlet of the power mechanism through an air pipe.
[0005] A further improvement of the technical solution of the utility model is that the stirring box of the stirring mechanism main body is cylindrical and horizontally placed above the power mechanism. A plurality of stirring blades are arranged inside the stirring box. The stirring blades are driven by a stirring motor at the bottom of the stirring box. A discharge port and a baffle are arranged on the side of the stirring box.
[0006] A further improvement of the technical solution of the utility model is that the power mechanism body is a sealed power mechanism box, the top of the power mechanism box is provided with a feed port, the bottom is an arc surface, the side is provided with a high-pressure air inlet, a pressure gauge and a pressure relief valve, and a material pipe is provided in the middle of the bottom arc surface.
[0007] The further improvement of the technical solution of the utility model is that: the feed port on the power mechanism and the feed pipe are both provided with sealing valves, and the high-pressure air inlet is provided with an air intake pressure-stabilizing valve.
[0008] A further improvement of the technical solution of the utility model is that a filter screen is arranged on the feed inlet at the top of the power mechanism.
[0009] A further improvement of the technical solution of the utility model is that a rotating device capable of driving the fan-shaped nozzle to rotate is arranged at the connection between the fan-shaped nozzle and the material pipe, and a nozzle baffle is arranged on the top of the rotating device.
[0010] The further improvement of the technical solution of the utility model is that: the fan-shaped nozzle body is an arc-shaped tubular structure, the tail nozzle is fan-shaped, and the baffle of the nozzle baffle is an outwardly convex arc surface.
[0011] A further improvement of the technical solution of the utility model is that a heat insulating material capable of reducing heat radiation is wound around the fan-shaped nozzle.
[0012] A further improvement of the technical solution of the utility model is that a sealing valve is arranged on the air pipe, and the valves on the air pipe, the feed port, the feed pipe and the high-pressure air inlet are all electric valves, which can realize automatic control.
[0013] The further improvement of the technical solution of the utility model is that the air pipe and the material pipe can withstand a pressure of ≥1.0MPa and a quick connection joint is selected for connection.
[0014] Due to the adoption of the above technical scheme, the technical progress achieved by the utility model is as follows: by setting up a spraying device, paint can be sprayed on the socket end of the cold mold pipe mold during the casting gap, and the paint can be dried with the help of the residual heat of the pipe mold. The paint serves as an isolation layer between the pipe mold and the ball tube, reducing the thermal stress and mechanical stress of the inner wall of the pipe mold. The use of this device prolongs the use time of the cold mold pipe mold, reduces the replacement frequency, improves production efficiency, increases the total life of the cold mold pipe mold, and reduces production costs. By setting up a nozzle rotating device and connecting the nozzle to the air pipe, the nozzle can be rotated in the pipe mold. At the same time, the nozzle can not only spray high-pressure air to purge the inside of the pipe mold, but also spray paint to spray the inside of the pipe mold, effectively extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.
[0016] Figure 1It is a structural schematic diagram of the spraying device of the utility model;
[0017] Figure 2 It is a schematic diagram of the overall assembly of the spraying device of the utility model;
[0018] Among them, 1. stirring mechanism, 101. stirring box, 102. discharge port, 103. stirring blade, 104. stirring motor, 2. power mechanism, 201. power mechanism box, 202. feed port, 203. high-pressure air inlet, 204. air pipe, 205. discharge port, 206. material pipe, 207. pressure gauge, 208. pressure relief valve, 3. nozzle mechanism, 301. fan-shaped nozzle, 302. rotating device, 303. nozzle baffle, 4. pipe mold driving motor, 5. socket dust suction device, 6. pipe mold, 7. upper core frame. DETAILED DESCRIPTION
[0019] The present invention is further described in detail below in conjunction with the embodiments:
[0020] Embodiment 1
[0021] like Figure 1 The structure diagram of a pressure spraying device for extending the life of a cold mold of a ductile iron pipe is shown. The main body is divided into three interconnected parts, namely a stirring mechanism 1, a power mechanism 2 and a nozzle mechanism 3. The stirring mechanism 1 is at the top of the spraying device, and the main body is a stirring box 101. The stirring box 101 is cylindrical in shape and placed horizontally. A plurality of stirring blades 103 are arranged inside the stirring box 101. An opening is arranged at the top of the stirring box 101 for placing paint, and a stirring motor 104 is arranged at the bottom for driving the stirring blades 103. A discharge port 102 and a baffle are arranged on the side.
[0022] The feed port 202 of the power mechanism 2 is connected below the discharge port 102. The power mechanism is a high-pressure air type power mechanism, which uses high-pressure air to provide power to drive the paint to be sprayed. The main body of the power mechanism 2 is a sealed power mechanism box 201. The top of the power mechanism box 201 is the feed port 202, which is connected to the discharge port 102 and has a built-in electric sealing valve, which can rely on PLC to realize automatic control of the switch closure. A 0.5mm filter screen is provided on the feed box port 202 to filter the paint. The ground of the power mechanism box 201 is an arc surface, which is convenient for the paint to be collected in the box. A discharge port 205 is provided in the middle of the arc surface, and an electric sealing valve is also provided on the discharge port 205. A high-pressure air inlet 203 is provided on the side of the power mechanism box 201, and an electrically controlled air intake pressure regulating valve is provided on the high-pressure air inlet 203. At the same time, a barometer 207 and a pressure relief valve 208 are also provided on the side of the box, which can control and observe the air pressure in the box at any time.
[0023] A material pipe 206 is connected to the discharge port. The high-pressure gas in the box provides power for the paint and is output to the nozzle mechanism 3 through the material pipe 206 at the bottom for spraying. The material pipe 206 can withstand a pressure of ≥1.0MPa, and a quick-connect joint is selected to ensure the safety and efficiency of the spraying process. A rotating device 302 that can drive the nozzle to rotate is connected to the tail end of the material pipe 206. A nozzle baffle 303 is provided on the top of the rotating device 302, and a fan-shaped nozzle 301 is provided on the rotating device 302. The rotating device 302 can rotate clockwise or counterclockwise by 30°-90°, and at the same time drive the fan-shaped nozzle 301 and the nozzle baffle 303 to rotate. The nozzle baffle 303 is an outwardly protruding arc surface, which can be effectively located between the nozzle and the tube mold to block the splashing molten iron during the centrifugal production process. The main body of the fan-shaped nozzle 301 is an arc-shaped tubular structure, and the nozzle at the tail end is fan-shaped. The fan-shaped nozzle 301 is wrapped with heat-insulating materials that can reduce heat radiation, which can effectively reduce heat radiation and reduce the nozzle temperature.
[0024] At the same time, the nozzle of the fan-shaped nozzle 301 is also connected to the high-pressure air inlet 203 on the power mechanism 2 through the air pipe 204, so that high-pressure air can enter the nozzle. The air pipe 204 is also provided with an electric sealing valve. With the help of the double pipelines of the air pipe 204 and the material pipe 206 and the switching of the respective sealing valves, the fan-shaped nozzle 301 can spray both paint and high-pressure air. It can spray paint to spray inside the pipe, and can also spray high-pressure air to open the air and blow out residual material in the pipe.
[0025] Working principle or usage: Figure 2 The figure shows a schematic diagram of the assembly of a pressure spraying device for extending the life of a cold mold of a ductile iron pipe, which sprays paint on the pipe mold after installation, including a stirring mechanism 1, a power mechanism 2, a nozzle mechanism 3, a pipe mold driving motor 4, a socket dust suction device 5, a pipe mold 6 and an upper core frame 7 connected to each other. After installation, the specific implementation steps are as follows:
[0026] Step 1: Mixing, take 3 parts of Na-based bentonite and 33 parts of water, mix, stir for 6 hours, take the bentonite and water coating and put it into the stirring mechanism 1, add 20 parts of diatomaceous earth, turn on the stirring box motor 104 to drive the stirring blade 103 to stir for 25 minutes. Test the coating viscosity, apply 6 cups for 35 seconds, qualified. Open the discharge port 102, open the sealing valve of the feed port 202, and put the coating into the power mechanism box 201;
[0027] Step 2: Pressurize, place a 0.5mm filter screen at the feed inlet 202 to filter the paint, after discharging, close the sealing valve of the feed inlet 202, close the valve of the discharge port 205, open the valve of the high-pressure air inlet 203, the valve of the high-pressure air inlet 203 is an air inlet pressure regulating valve, adjust the valve of the high-pressure air inlet 203 to 0.6MPa, and check the pressure gauge 207;
[0028] Step 3: Purge before spraying. After the ductile iron pipe is pulled out, the centrifuge moves upward, the nozzle rotating device 302 rotates 90° clockwise, the fan-shaped nozzle 301 faces the position 100-1000mm of the pipe mold socket, the air pipe 204 valve is opened, and the air is blown to purge the residual paint in the pipe mold 6 for 3 seconds, and the pipe mold 6 is kept rotating at a low speed;
[0029] Step 4: Spraying, open the valve of the material opening 205, and spray the coating material from the fan-shaped nozzle 301 toward the socket of the tube mold 6 for 4 seconds, and keep the tube mold 6 rotating at a low speed;
[0030] Step 5: Purge after spraying, close the valve of discharge port 205, keep the valve of air pipe 204 open, purge the dust on the surface of the coating layer for 3 seconds, close the valve of air pipe 204, rotate the nozzle rotating device 302 counterclockwise 90°, the fan-shaped nozzle 301 faces downward, and the nozzle baffle 303 is located between the fan-shaped nozzle 301 and the tube mold 6 to block the splashing molten iron during the centrifugal production process, reduce heat radiation, and reduce the nozzle temperature. Keep the tube mold 6 rotating at a low speed;
[0031] Step 6: core loading, the core rack 7 is provided with the sand core, the centrifuge moves upward, and the speed of the tube mold driving motor 4 is gradually increased, thereby increasing the speed of the tube mold 6;
[0032] Step 7: Casting, the centrifuge is in place, the speed of the tube mold 6 is in place, the fan-shaped bag is turned over, the molten iron flows into the socket of the tube mold 6 through the flow channel, the centrifuge moves downward, and the flow channel exits;
[0033] Step 8: pipe drawing, the molten iron solidifies, the temperature of the ductile iron pipe drops to 500-800°C, the upper core frame 7 withdraws, the pipe drawing pliers draw the pipe, the next pipe is cast, and S2-S7 are repeated;
[0034] Step 9: Spraying. During the above process, keep the spraying system on the outer wall of the pipe mold open normally.
[0035] It can be seen from the above-mentioned actual production process that by adopting the new pressure spraying device, the paint can be sprayed on the socket position of the pipe mold during the casting gap, and the paint can be dried with the help of the residual heat of the pipe mold. The paint serves as an isolation layer between the pipe mold and the ball tube, reducing the high temperature strain and mechanical stress at this position, extending the use time of the cold mold pipe mold, improving production efficiency, increasing the total life of the cold mold pipe mold, and reducing production costs.
[0036] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.
Claims
1. A pressure spraying device for extending the life of a ductile iron pipe cold mold method, comprising a stirring mechanism (1), a power mechanism (2) and a nozzle mechanism (3); the discharge port (102) of the stirring mechanism (1) is connected to the feed port (202) of the high-pressure air type power mechanism (2), and the power mechanism (2) is provided with a high-pressure air inlet (203), characterized in that: A material pipe (206) is connected to the bottom of the power mechanism (2), and a rotatable nozzle mechanism (3) is connected to the material pipe (206). The nozzle mechanism (3) includes a fan-shaped nozzle (301) connected to the material pipe (206), and the fan-shaped nozzle (301) is also connected to the high-pressure air inlet (203) of the power mechanism (2) through an air pipe (204).
2. A pressure spraying device for extending the life of a ductile iron pipe cold mold according to claim 1, characterized in that: The stirring box (101) of the stirring mechanism (1) is cylindrical and is horizontally placed above the power mechanism (2). A plurality of stirring blades (103) are arranged inside the stirring box (101). The stirring blades (103) are driven by a stirring motor (104) at the bottom of the stirring box (101). A discharge port (102) and a baffle are arranged on the side of the stirring box (101).
3. A pressure spraying device for extending the life of a cold mold of a ductile iron pipe according to claim 1, characterized in that: The main body of the power mechanism (2) is a sealed power mechanism housing (201), the top of the power mechanism housing (201) is provided with a feed port (202), the bottom is an arc surface, the side is provided with a high-pressure air inlet (203), a pressure gauge (207) and a pressure relief valve (208), the middle of the bottom arc surface is provided with a discharge port (205), and a material pipe (206) is connected to the discharge port (205).
4. A pressure spraying device for extending the life of a cold mold of a ductile iron pipe according to claim 3, characterized in that: The feed port (202) and the discharge port (205) on the power mechanism (2) are both provided with sealing valves, and the high-pressure air inlet (203) is provided with an air intake pressure-stabilizing valve.
5. A pressure spraying device for extending the life of a cold mold of a ductile iron pipe according to claim 3, characterized in that: A filter screen is provided on the feed inlet (202) at the top of the power mechanism (2).
6. A pressure spraying device for extending the life of a cold mold of a ductile iron pipe according to claim 1, characterized in that: A rotating device (302) capable of driving the fan-shaped nozzle (301) to rotate is arranged at the connection between the fan-shaped nozzle (301) and the material pipe (206), and a nozzle baffle (303) is arranged on the top of the rotating device (302).
7. A pressure spraying device for extending the life of a cold mold of a ductile iron pipe according to claim 6, characterized in that: The main body of the fan-shaped nozzle (301) is a circular arc tubular structure, the tail nozzle is fan-shaped, and the baffle of the nozzle baffle (303) is an outwardly protruding circular arc surface.
8. A pressure spraying device for extending the life of a cold mold of a ductile iron pipe according to claim 7, characterized in that: The fan-shaped nozzle (301) is wrapped with a heat-insulating material capable of reducing heat radiation.
9. A pressure spraying device for extending the life of a ductile iron pipe cold mold according to claim 1 or 4, characterized in that: A sealing valve is arranged on the air pipe (204), and the valves on the air pipe (204), the feed port (202), the discharge port (205) and the high-pressure air inlet (203) are all electric valves, which can realize automatic control.
10. The pressure spraying device for extending the life of a cold mold of a ductile iron pipe according to claim 1, characterized in that: The air pipe (204) and the material pipe (206) are pressure-bearing ≥ 1.0 MPa and are connected by a quick-connect joint.