Low-cost fire extinguisher plastic valve and preparation method thereof

A fire extinguisher, low-cost technology, applied in fire rescue and other directions, can solve the problems of loss of sealing performance of fire extinguisher valves, high production cost, complex structure, etc., and achieve the effects of increasing market competitiveness, good dimensional stability, and improving mechanical properties.

Inactive Publication Date: 2017-05-31
MAANSHAN TIANRUI IND
6 Cites 0 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problems in the prior art that the valve ejector rod assembly and valve body of the fire extinguisher are made of metal materials, the production cost is high, the structure is complicated, and the sealing performance of the fire extinguisher valve is lost due to easy corrosion, and a low-cost valve is provided. Fire extinguisher plastic valve and its preparation method; on the one hand, the invention improves the structure of the ejector rod assembly, so that the structure of the ej...
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Method used

For this reason, the present embodiment provides a kind of fire extinguisher valve plastic ejector rod, and its structure is as shown in Figure 5, and it adopts nylon composite material injection molding integral molding, and one end of this ejector rod 42 is provided with sealing ring groove 421, and rubber O Type sealing ring 41 is set in the sealing ring groove 421, and the other end of the ejector rod 42 is provided with a cap head 423, and the side of the cap head 423 close to the sealing ring groove 421 is provided with a gasket groove 422, and 44 sets of gaskets in the gasket groove 422 . Compared with the traditional structure, in this embodiment, the original ejector rod 42 and the hat head 45 are integrally formed by injection molding of nylon composite material, and the use of the insert piece 43 is also omitted. On the one hand, the structure is simpler and the assembly time is greatly shortened; on the other hand, the injection molding process of the ejector pin saves manpower and material resources compared with the processing technology of metal parts, and the purchase cost of nylon materials is much lower than that of metal materials. The manufacture of plastic ejector pins The cost is significantly reduced, which increases the market competitiveness of fire extinguisher manufacturers.
It can be said that the ejector rod assembly 4...
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Abstract

The invention discloses a low-cost fire extinguisher plastic valve and a preparation method thereof, and belongs to the technical field of fire extinguishers. A push rod and a valve body are integrally molded by injection by using a nylon composite material. The preparation method comprises the following steps: (1) slicing nylon 66, and evenly mixing long glass fiber, silicon carbide, talc and mica powder under the stirring condition; (2) putting mixed raw materials into a feeding port of an injection molding machine, rapidly injecting into a mold cavity at high pressure by means of the thrust of a screw after melting, opening a mold after cooling and curing, and immersing primary products of the push rod and the valve body into 5 to 20 DEG C water to be cooled; and (3) boiling the molded push rod and valve body products at high temperature after being tested. The push rod and the valve body provided by the invention can completely meet requirements of corrosion resistance, high pressure resistance and high and low temperature resistance provided by the internal environment of the fire extinguisher valve, are ideal in using effect, and are conveniently popularized and applied.

Application Domain

Fire rescue

Technology Topic

TalcMica +9

Image

  • Low-cost fire extinguisher plastic valve and preparation method thereof
  • Low-cost fire extinguisher plastic valve and preparation method thereof
  • Low-cost fire extinguisher plastic valve and preparation method thereof

Examples

  • Experimental program(3)

Example Embodiment

[0040] Example 1
[0041] Combine figure 2 , image 3 with Figure 4 , The traditional fire extinguisher valve mainly includes the riser seat 1, the spring 2, the valve body 3, the mandrel assembly 4, the pressure handle 51 and the handle 52. The valve body 3 is in a closed connection with the fire extinguisher storage bottle through the standpipe seat 1, and is provided with a side channel 31, an upper channel 32 and a lower channel 33. The valve body 3 is provided with a mandrel assembly 4, the lower part of the mandrel assembly 4 is provided with a spring 2, and the upper part is pressed against the pressing handle 51. The mandrel assembly 4 blocks the upper channel 32 and the lower channel 33 of the valve body 3 for To realize the sealed filling of the fire extinguishing agent, the pressing handle 51 and the handle 52 are connected by a rivet 53. A safety pin 62 is also provided between the pressing handle 51 and the handle 52. The safety pin 62 is connected to the handle through a rubber chain 61 52 connected. When extinguishing the fire, the firefighter pulls out the safety pin 62 and presses the pressing handle 51, so that the ejector rod assembly 4 is pressed down, and the extinguishing agent is sprayed from the side channel 31.
[0042] It can be said that the mandrel assembly 4 and the valve body 3 are the core components to ensure the performance of the fire extinguisher valve, but the mandrel assembly 4 of the traditional structure is like figure 1 As shown, the ejector pin 42, the cap 45, and the insert 43 are all made of metal materials such as copper or aluminum. The production cost is high, and the corrosiveness of the fire extinguishing agent filled in the fire extinguisher storage bottle to metal cannot be ignored. .
[0043] To this end, this embodiment provides a fire extinguisher valve plastic ejector rod, which has a structure such as Figure 5 As shown, it is integrally formed by injection molding of nylon composite material. One end of the top rod 42 is provided with a sealing ring groove 421, a rubber O-ring 41 is sleeved in the sealing ring groove 421, and the other end of the top rod 42 is provided with a cap head 423 A sealing gasket groove 422 is opened on the side of the cap head 423 close to the sealing ring groove 421, and the sealing gasket 44 is sleeved in the sealing gasket groove 422. Compared with the traditional structure, in this embodiment, the original ejector pin 42 and the cap head 45 are integrally molded by injection molding of nylon composite material, and the insert 43 is also omitted. On the one hand, the structure is simpler and the assembly time is greatly shortened; on the other hand, the injection molding process of the ejector pin is also more labor-saving compared to the processing technology of metal parts, and the purchase cost of nylon materials is much lower than that of metal materials and the manufacturing of plastic ejector pins. The cost is significantly reduced, which increases the market competitiveness of fire extinguisher manufacturers.
[0044] It is worth noting that the injection molding of the ejector rod and the valve body can not be simply manufactured by using the traditional injection molding process. To meet the special environment and use requirements of the fire extinguisher valve, the plastic ejector rod and the valve body must be creeping under the action of permanent pressure. The change is small, and it meets the requirements of corrosion resistance, high pressure resistance, high and low temperature resistance. In addition, the ejector rod and valve body are a small product, and they need to cooperate with other structures to achieve the encapsulation of the fire extinguishing agent. The dimensional accuracy of the valve body is also very high. However, the traditional injection molding process cannot meet the above requirements well.
[0045] Based on this, first this embodiment provides a new material formula, including the following components:
[0046]
[0047] The glass fiber length of the long glass fiber is 18 mm.
[0048] The material formula used in this embodiment can form a uniformly dispersed fiber phase structure in the nylon 66 matrix, with good fluidity and thermal stability in the molten state, thereby significantly improving the mechanical properties of the nylon composite material. The plastic ejector rod and valve body have good dimensional stability, good surface gloss, and can effectively increase the rigidity and toughness of the valve ejector rod and valve body.
[0049] Secondly, this embodiment provides a method for preparing a fire extinguisher valve plastic ejector rod and valve body, and the steps are:
[0050] Step 1. Mix 40 parts of nylon 66 slices, 25 parts of long glass fiber, 2 parts of silicon carbide, 0.5 parts of talc powder and 1 part of mica powder under stirring conditions;
[0051] Step 2. Ejector injection: Put the mixed raw materials into the feeding port of the injection molding machine, and then quickly inject it into the ejector cavity at high pressure by the thrust of the screw after melting; the screw speed of the injection molding machine is 100rpm; the screw length of the injection molding machine The diameter ratio is 18. The temperature of the feeding section of the injection molding machine is controlled at 300°C; the temperature of the feeding section is controlled at 285°C; the temperature of the injection section is controlled at 285°C; the nozzle temperature is controlled at 280°C; the mold temperature is controlled at 90°C. The injection molding machine is divided into three sections to complete the injection. The injection parameters are: the injection speed of the first injection section is 60mm/s, and the injection pressure is 85kg/cm. 2 , The injection time is 9s, the injection speed of the second injection section is 35mm/s, and the injection pressure is 80kg/cm 2 , The injection time is 6s, the injection speed of the third injection section is 20mm/s, and the injection pressure is 45kg/cm 2 , The injection time is 9s, after the third injection section, keep the pressure for 15s. After cooling and solidification, open the mold, and immerse the first product of the ejector pin in water at 15°C for 2 minutes to shape the surface to keep the surface flat.
[0052] Valve body injection molding: Put the mixed raw materials into the feeding port of the injection molding machine, and quickly inject them into the cavity of the valve body at high pressure by the thrust of the screw after melting. The screw speed of the injection molding machine is 100 rpm; the screw length to diameter ratio of the injection molding machine is 18. The temperature of the feeding section of the injection molding machine is controlled at 300°C; the temperature of the feeding section is controlled at 285°C; the temperature of the injection section is controlled at 285°C; the nozzle temperature is controlled at 280°C; the mold temperature is controlled at 90°C. The injection molding machine is divided into two sections to complete the injection. The injection parameters are: the injection speed of the first injection section is 55mm/s, and the injection pressure is 75kg/cm. 2 , The injection time is 6s, the injection speed of the second injection section is 25mm/s, and the injection pressure is 40kg/cm 2 , The injection time is 15s, after the second injection section, keep the pressure for 15s. After cooling and solidification, the mold is opened to prepare the initial valve body, and the initial valve body is immersed in water at 20°C for 2 minutes.
[0053] Step 3. After the molded ejector rod and valve body products are inspected, they are put into the equipment for high-temperature cooking for 3 hours, and the final product is obtained.
[0054] Step 4. Assemble the components of the fire extinguisher valve into one.
[0055] This embodiment is based on the material formula used, and by controlling the injection molding process parameters, the problem of poor fluidity caused by the addition of long glass fibers is overcome, and the shearing effect of the long glass fibers is reduced when the long glass fibers enter the mold cavity. Not easy to break. It is especially important that this embodiment overcomes the problem of flashing in small products by controlling the injection speed and pressure (this is very important). The produced ejector rod and valve body have high dimensional accuracy, which can fully meet the requirements. The internal environment of the fire extinguisher valve puts forward the requirements of corrosion resistance, high pressure resistance, high and low temperature resistance, and the use of the fire extinguisher valve is ideal, which is convenient for popularization and application.

Example Embodiment

[0056] Example 2
[0057] The low-cost fire extinguisher plastic valve of this embodiment is basically the same as that of Embodiment 1, except that the nylon composite material used in this embodiment includes the following components:
[0058]
[0059] The preparation process of the fire extinguisher valve in this embodiment is as follows:
[0060] Step 1. Mix 35 parts of nylon 66 slices, 30 parts of long glass fiber, 1 part of silicon carbide, 1 part of talc powder and 0.5 parts of mica powder under stirring conditions;
[0061] Step two, ejector injection: put the mixed raw materials into the feeding port of the injection molding machine, and then quickly inject it into the ejector mold cavity at high pressure by the thrust of the screw after melting; the screw speed of the injection molding machine is 80rpm; the screw length of the injection molding machine The diameter ratio is 22. The temperature of the feeding section of the injection molding machine is controlled at 290°C; the temperature of the conveying section is controlled at 280°C; the temperature of the injection section is controlled at 275°C; the nozzle temperature is controlled at 275°C; the mold temperature is controlled at 70°C. The injection molding machine is divided into three sections to complete the injection molding. The injection parameters are: the injection speed of the first injection section is 55mm/s, and the injection pressure is 90kg/cm. 2 , The injection time is 9s, the injection speed of the second injection section is 40mm/s, and the injection pressure is 70kg/cm 2 , The injection time is 6s, the injection speed of the third injection section is 25mm/s, and the injection pressure is 40kg/cm 2 , The injection time is 9s, after the third injection section, the pressure is maintained for 10s. After cooling and solidification, open the mold, and immerse the first product of the ejector pin in water at 20°C for 3 minutes to shape the surface to keep the surface flat.
[0062] Valve body injection molding: Put the mixed raw materials into the feed port of the injection molding machine, and quickly inject them into the cavity of the valve body at high pressure by the thrust of the screw after melting. The screw speed of the injection molding machine is 90 rpm; the length to diameter ratio of the injection molding machine is 19. The temperature of the feeding section of the injection molding machine is controlled at 295°C; the temperature of the feeding section is controlled at 285°C; the temperature of the injection section is controlled at 275°C; the nozzle temperature is controlled at 280°C; the mold temperature is controlled at 70°C. The injection molding machine is divided into two stages to complete the injection. The injection parameters are: the injection speed of the first injection stage is 50mm/s, and the injection pressure is 60kg/cm. 2 , The injection time is 7s, the injection speed of the second injection section is 20mm/s, and the injection pressure is 45kg/cm 2 , The injection time is 20s, after the second injection section, the pressure is maintained for 18s. After cooling and solidification, the mold is opened to prepare the initial valve body, and the initial valve body is immersed in water at 5°C for 3 minutes.
[0063] Step 3. After inspecting the molded ejector rod and valve body products, put them into the equipment for high-temperature cooking for 2.5 hours to restore the original toughness of the nylon ejector rod to obtain the final product.
[0064] Step 4. Assemble the components of the fire extinguisher valve into one.

Example Embodiment

[0065] Example 3
[0066] The low-cost fire extinguisher plastic valve of this embodiment is basically the same as that of Embodiment 1, except that the nylon composite material used in this embodiment includes the following components:
[0067]
[0068] The preparation process of the fire extinguisher valve in this embodiment is as follows:
[0069] Step 1. Mix 38 parts of nylon 66 slices, 28 parts of long glass fiber, 1.5 silicon carbide, 0.6 parts of talc powder and 0.6 parts of mica powder under stirring conditions;
[0070] Step 2: Put the mixed raw materials into the feeding port of the injection molding machine, and quickly inject them into the mold cavity at high pressure by the thrust of the screw after melting; the screw speed of the injection molding machine is 90 rpm; the screw length to diameter ratio of the injection molding machine is 20. The temperature of the feeding section of the injection molding machine is controlled at 295°C; the temperature of the feeding section is controlled at 282°C; the temperature of the injection section is controlled at 283°C; the nozzle temperature is controlled at 280°C; the mold temperature is controlled at 80°C. The injection molding machine is divided into three sections to complete the injection. The injection parameters are: the injection speed of the first injection section is 57mm/s, and the injection pressure is 88kg/cm. 2 , The injection time is 9s, the injection speed of the second injection section is 36mm/s, and the injection pressure is 75kg/cm 2 , The injection time is 6s, the injection speed of the third injection section is 22mm/s, and the injection pressure is 42kg/cm 2 , The injection time is 9s, after the third injection section, the pressure is maintained for 13s. After cooling and solidification, open the mold, and immerse the primary ejector pin in water at 5°C for 3 minutes to shape the surface to keep the surface flat.
[0071] Valve body injection molding: Put the mixed raw materials into the feeding port of the injection molding machine, and quickly inject them into the cavity of the valve body at high pressure by the thrust of the screw after melting. The screw speed of the injection molding machine is 90 rpm; the screw length to diameter ratio of the injection molding machine is 20. The temperature of the feeding section of the injection molding machine is controlled at 295°C; the temperature of the feeding section is controlled at 282°C; the temperature of the injection section is controlled at 283°C; the nozzle temperature is controlled at 280°C; the mold temperature is controlled at 80°C. The injection molding machine is divided into two stages to complete the injection. The injection parameters are: the injection speed of the first injection stage is 52mm/s, and the injection pressure is 70kg/cm. 2 , The injection time is 9s, the injection speed of the second injection section is 23mm/s, and the injection pressure is 42kg/cm 2 , The injection time is 16s, after the second injection section, the pressure is maintained for 15s. After cooling and solidification, the mold is opened to prepare the initial valve body, and the initial valve body is immersed in water at 16°C for 3 minutes.
[0072] Step 3. After inspecting the molded ejector rod and valve body products, put them into the equipment for high-temperature cooking for 3 hours to restore the original toughness of the nylon ejector rod to obtain the final product.
[0073] Step 4. Assemble the components of the fire extinguisher valve into one.

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Description & Claims & Application Information

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