Needle valve for pouring polyurethane

Abstract

The utility model discloses a needle valve for polyurethane pouring. The needle valve comprises a valve seat, a valve body is fixedly connected to the side wall of the bottom of the valve seat. A needle head is fixedly connected to the side wall of the bottom of the valve body; a liquid outlet is formed in the middle of the side wall of the needle head; the valve body, the needle head and the liquid outlet are all hollow and are communicated with one another; a telescopic rod is in sliding fit with the middle of the inner side wall of the valve seat. By arranging the connecting base, the liquid outlet head, the second pressing rod and the material injection bases, the flow of the polyurethane raw material can be more flexibly controlled, the number of the material injection bases is reasonably designed according to actual requirements, the flowing path of the polyurethane raw material is optimized, and adverse flowing phenomena such as eddy currents and turbulent currents are reduced, so that the stability and efficiency of the polyurethane raw material are improved, and the production cost is reduced. And a plurality of material injection seats are arranged on the needle valve, so that the pressure generated when the polyurethane raw material passes through the needle valve can be more uniformly distributed, the problems of abrasion, leakage or performance reduction and the like caused by non-uniform pressure are reduced, the reliability of the needle valve is improved, and the service life of the needle valve is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of needle valve technology, specifically to a needle valve for polyurethane casting. Background Technology

[0002] Polyurethane (PU), also known as polyurethane, is an organic polymer material with multiple urethane segments, mainly composed of isocyanates and polyol polymers (polyethers or polyesters) reacted under the action of relevant chemical auxiliaries. Due to its excellent plasticity, wear resistance, low-temperature resistance, and aging resistance, it is widely used in construction, transportation, home furnishings, and textiles, among other fields.

[0003] Before the actual injection molding, the staff preheated the mold to ensure that the mold temperature reached the optimal curing temperature of the polyurethane material. Then, the injection molding machine was turned on, and the polyurethane material was injected into the mold through the needle valve. Through long-term use and observation, it was found that by reasonably designing the number of injection ports according to actual needs when using the needle valve to inject polyurethane into the mold, the staff could reduce unfavorable flow phenomena such as eddies and turbulence in the liquid.

[0004] Therefore, this utility model provides a needle valve for polyurethane casting. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this utility model provides a needle valve for polyurethane casting.

[0006] This utility model discloses a needle valve for polyurethane casting, comprising a valve seat; a valve body fixedly connected to the bottom side wall of the valve seat; a needle fixedly connected to the bottom side wall of the valve body; a liquid outlet opened in the middle of the side wall of the needle; the valve body, needle, and liquid outlet are all hollow and interconnected; a telescopic rod slidably fitted in the middle of the inner side wall of the valve seat; a first pressing rod fixedly connected to the bottom side wall of the telescopic rod; a mixing component provided in the bottom side wall of the first pressing rod; the mixing component is located inside the valve body; a speed control component provided in the bottom side wall of the mixing component; the speed control component is located inside the valve body; a mixing seat assembled in the middle of the side wall of the valve body; a feed port opened in the middle of the side wall of the mixing seat; multiple feed ports are arranged in a circular array on the side wall of the valve body; an injection component is provided outside the feed ports; a cleaning component is assembled in the middle of the side wall of the valve body; the cleaning component is located above the injection component; the injection component includes multiple connecting seats; multiple connecting seats are fixedly connected to the mixing seat. The connecting seat and the feed inlet are correspondingly arranged; an exhaust assembly is assembled in the middle of the inner side wall of the connecting seat; a liquid outlet head is fixedly connected to the middle of the side wall of the exhaust assembly; the liquid outlet head is located inside the feed inlet; a second pressing rod is slidably connected to the middle of the inner side wall of the connecting seat; the second pressing rod and the exhaust assembly are slidably connected; a filling seat is threadedly connected to the middle of the side wall of the second pressing rod; the filling seat and the connecting seat are fixedly connected. This step, by setting the connecting seat, the liquid outlet head, the second pressing rod, and the filling seat, allows for more flexible control of the flow rate of polyurethane raw materials. The number of filling seats can be reasonably designed according to actual needs, optimizing the flow path of polyurethane raw materials and reducing unfavorable flow phenomena such as eddies and turbulence, thereby improving the stability and efficiency of polyurethane raw materials. Furthermore, setting multiple filling seats on the needle valve helps to distribute the pressure generated by the polyurethane raw materials when passing through the needle valve more evenly, reducing problems such as wear, leakage, or performance degradation caused by uneven pressure, and improving the reliability and service life of the needle valve.

[0007] Preferably, the mixing assembly includes a rotating rod; the rotating rod is fixedly connected to the bottom of the first pressing rod; a mixing plate is fixedly connected to the bottom side wall of the rotating rod; a stirring shaft is fixedly connected to the bottom side wall of the mixing plate; the rotating rod, the mixing plate, and the stirring shaft are all located inside the valve body. This step, by setting the rotating rod, the mixing plate, and the stirring shaft, enables the polyurethane raw materials to be mixed quickly and uniformly, reducing defects such as bubbles and impurities in the product after polyurethane injection, improving the overall quality of the product. At the same time, the uniformly mixed polyurethane raw materials can also make the product performance more stable, reducing performance fluctuations caused by uneven mixing of polyurethane raw materials.

[0008] Preferably, the speed control component includes a stirring plate; the stirring plates are multiple and arranged in a linear array on the side wall of the stirring shaft; a speed control cavity is formed in the middle of the side wall of the stirring plate; the speed control cavity is multiple and arranged in a circular array on the side wall of the stirring plate; this step, by setting the stirring plate and the speed control cavity, can adjust the flow rate of polyurethane in the needle valve, so that the polyurethane passes through the needle valve at a stable flow rate, thereby improving the quality and output of the product, and by changing the flow cross-sectional area of ​​the polyurethane to adjust the rotational speed of the stirring shaft, precise load control can be achieved, which helps to reduce system fluctuations and vibrations and improve the operational stability of the system.

[0009] Preferably, the cleaning assembly includes a cleaning seat; the cleaning seats are multiple and arranged in a circular array on the side wall of the mixing seat; an outlet is provided in the middle of the side wall of the cleaning seat; a first inlet is fixedly connected to the middle of the side wall of the cleaning seat; a second inlet is fixedly connected to the middle of the side wall of the cleaning seat; the cleaning seat, the outlet, the first inlet, the second inlet, and the mixing seat are connected; this step, by setting the cleaning seat, the outlet, the first inlet, and the second inlet, can remove polyurethane and other residues, making the needle valve channel unobstructed and the valve core move flexibly, thereby improving the flow control accuracy and response speed of the needle valve. Moreover, the corrosive components in polyurethane and other residues can damage the material of the needle valve, causing leaks, jamming, and other malfunctions. Regular cleaning with the cleaning assembly can effectively remove these corrosive components, protect the material of the needle valve from damage, and thus extend the service life of the needle valve.

[0010] Preferably, the venting assembly includes an injection pipe; the injection pipe is fixed between the connector and the outlet head; multiple vents are provided in the middle of the side wall of the injection pipe; this step, by setting the injection pipe and vents, can help vent the inside of the injection pipe, so that the polyurethane raw material will not be interfered with by air bubbles during the injection process, thereby improving the accuracy and efficiency of the injection. In addition, in an environment with unbalanced internal and external pressure, the vents are used to balance the internal and external pressure, which helps to prevent the injection pipe from rupturing or the polyurethane raw material from leaking due to excessive pressure difference.

[0011] Preferably, a sealing gasket is fixedly connected to the middle of the side wall of the second pressing rod; the sealing gasket is made of elastic material; this step can improve the sealing between the injection seat and the connecting seat by setting the sealing gasket, and prevent the polyurethane raw material from leaking during the injection process.

[0012] The beneficial effects of this application are as follows: by setting a connecting seat, a liquid outlet head, a second pressing rod, and a filling seat, the flow rate of polyurethane raw materials can be controlled more flexibly. The number of filling seats can be reasonably designed according to actual needs, the flow path of polyurethane raw materials can be optimized, and unfavorable flow phenomena such as eddies and turbulence can be reduced, thereby improving the stability and efficiency of polyurethane raw materials. In addition, setting multiple filling seats on the needle valve helps to distribute the pressure generated by the polyurethane raw materials when passing through the needle valve more evenly, reducing problems such as wear, leakage, or performance degradation caused by uneven pressure, and improving the reliability and service life of the needle valve. Attached Figure Description

[0013] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0014] Figure 1 This is a perspective view of the present utility model;

[0015] Figure 2 This is a schematic diagram of the cooperative structure of the injection seat and the cleaning seat in this utility model;

[0016] Figure 3 This is a cross-sectional view of the valve body in this utility model;

[0017] Figure 4 This is an exploded view of the injection station in this utility model;

[0018] Figure 5 This is a schematic diagram of the cooperation structure between the stirring shaft and the speed control chamber in this utility model.

[0019] In the attached diagram: 1. Valve seat; 11. Valve body; 12. Needle; 13. Liquid outlet; 14. Telescopic rod; 15. First pressing rod; 16. Mixing seat; 17. Feed inlet; 2. Connecting seat; 21. Liquid outlet head; 22. Second pressing rod; 23. Injection seat; 3. Rotating rod; 31. Mixing plate; 32. Stirring shaft; 4. Stirring plate; 41. Speed ​​control chamber; 5. Cleaning seat; 51. Water outlet; 52. First water inlet; 53. Second water inlet; 6. Injection pipe; 61. Exhaust port; 7. Sealing gasket. Detailed Implementation

[0020] The following drawings will disclose several embodiments of this utility model. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0021] It should be noted that all directional indicators in this utility model embodiment, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicator will also change accordingly.

[0022] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish conditions or operations described using the same technical terms, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, such a combination should be considered nonexistent and not within the scope of protection claimed by this utility model.

[0023] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0024] Reference Figures 1 to 5The system includes a valve seat 1; a valve body 11 is fixedly connected to the bottom side wall of the valve seat 1; a needle 12 is fixedly connected to the bottom side wall of the valve body 11; a liquid outlet 13 is provided in the middle of the side wall of the needle 12; the valve body 11, needle 12, and liquid outlet 13 are all hollow and interconnected; a telescopic rod 14 is slidably fitted in the middle of the inner side wall of the valve seat 1; a first pressing rod 15 is fixedly connected to the bottom side wall of the telescopic rod 14; a mixing component is provided in the bottom side wall of the first pressing rod 15; the mixing component is located inside the valve body 11; a speed control component is provided in the bottom side wall of the mixing component; the speed control component is located inside the valve body 11; a mixing seat 16 is assembled in the middle of the side wall of the valve body 11; a feed inlet 17 is provided in the middle of the side wall of the mixing seat 16; there are multiple feed inlets 17 arranged in a circular array on the side wall of the valve body 11; an injection component is provided outside the feed inlets 17; a cleaning component is assembled in the middle of the side wall of the valve body 11; the cleaning component is located above the injection component; during operation, the operator will... After adjusting the telescopic rod 14 to a suitable length, the inlet 17 and the injection assembly are connected together. Then, the polyurethane raw material is connected to the injection assembly, which injects the polyurethane raw material into the mixing seat 16, which then enters the valve body 11. At this time, the operator rotates the telescopic rod 14, which rotates the first pressing rod 15, causing the mixing assembly connected to its bottom to rotate synchronously. The mixing assembly mixes the polyurethane raw material. Under the adjustment of the speed control component, the mixed polyurethane raw material enters the needle 12 and is discharged from the outlet 13. After the pouring operation is completed, the operator connects the cleaning assembly to the mixing seat 16 and injects water and cleaning fluid into the cleaning assembly. The water and cleaning fluid enter the mixing seat 16 and then the valve body 11 to clean the inside of the valve body 11 and the mixing seat 16. The wastewater is then discharged from the outlet 13.

[0025] Reference Figures 1 to 4The injection assembly includes multiple connecting seats 2; multiple connecting seats 2 are fixedly connected to a mixing seat 16; connecting seats 2 and inlet 17 are correspondingly arranged; an exhaust assembly is installed in the middle of the inner side wall of the connecting seat 2; a liquid outlet 21 is fixedly connected to the middle of the side wall of the exhaust assembly; the liquid outlet 21 is located inside the inlet 17; a second pressing rod 22 is slidably connected to the middle of the inner side wall of the connecting seat 2; the second pressing rod 22 is slidably connected to the exhaust assembly; an injection seat 23 is threadedly connected to the middle of the side wall of the second pressing rod 22; the injection seat 23 is fixedly connected to the connecting seat 2; during operation, the operator injects polyurethane raw material into the multiple second pressing rods 22, and the polyurethane raw material will slowly pass through the liquid outlet 21 and enter the inlet 17 under the control of the exhaust assembly, and then enter the inlet 17 from the inlet 17. In the mixing seat 16, multiple sets of polyurethane raw materials gather and then enter the valve body 11, where they are stirred and mixed by the mixing components. This step, through the setting of the connecting seat 2, the liquid outlet head 21, the second pressing rod 22, and the injection seat 23, allows for more flexible control of the flow rate of the polyurethane raw materials. The number of injection seats 23 can be reasonably designed according to actual needs to optimize the flow path of the polyurethane raw materials and reduce unfavorable flow phenomena such as eddies and turbulence, thereby improving the stability and efficiency of the polyurethane raw materials. Furthermore, setting multiple injection seats 23 on the needle valve helps to distribute the pressure generated by the polyurethane raw materials when passing through the needle valve more evenly, reducing problems such as wear, leakage, or performance degradation caused by uneven pressure, and improving the reliability and service life of the needle valve.

[0026] Reference Figure 3 and Figure 5 The mixing assembly includes a rotating rod 3; the rotating rod 3 is fixed to the bottom of the first pressing rod 15; a mixing plate 31 is fixed to the bottom side wall of the rotating rod 3; a stirring shaft 32 is fixedly connected to the bottom side wall of the mixing plate 31; the rotating rod 3, the mixing plate 31, and the stirring shaft 32 are all located inside the valve body 11; during operation, multiple sets of polyurethane raw materials enter the valve body 11, and the operator rotates the telescopic rod 14, which in turn rotates the first pressing rod 15, causing the first pressing rod 15 to rotate along with the rotating rod 3 and the mixing plate 31. When the mixing plate 31 rotates, the stirring shaft 32 fixed to its bottom will rotate synchronously. At this time, the stirring shaft 32 will stir and mix the polyurethane raw materials in the valve body 11. This step, by setting the rotating rod 3, the mixing plate 31, and the stirring shaft 32, can make the polyurethane raw materials mix quickly and evenly, reduce defects such as bubbles and impurities in the product after polyurethane injection, and improve the overall quality of the product. At the same time, the evenly mixed polyurethane raw materials can also make the product performance more stable and reduce performance fluctuations caused by uneven mixing of polyurethane raw materials.

[0027] Reference Figure 3 and Figure 5The speed control component includes a stirring plate 4; multiple stirring plates 4 are arranged in a linear array on the side wall of the stirring shaft 32; a speed control chamber 41 is provided in the middle of the side wall of the stirring plate 4; multiple speed control chambers 41 are arranged in a circular array on the side wall of the stirring plate 4; during operation, after the polyurethane raw material in the valve body 11 is mixed, the operator rotates the stirring shaft 32. At this time, the stirring shaft 32 will rotate synchronously with multiple stirring plates 4. The mixed polyurethane raw material will pass through multiple speed control chambers 41 into the needle 12 and be discharged from the outlet 13. When the discharge volume decreases, the operator rotates the stirring shaft 32 again, so that the mixed polyurethane raw material passes through other speed control chambers 41 and is discharged outward during the stirring process. This step, by setting the stirring plate 4 and the speed control chamber 41, can adjust the flow rate of polyurethane in the needle valve, so that polyurethane passes through the needle valve at a stable flow rate, thereby improving the quality and output of the product. Moreover, by changing the flow cross-sectional area of ​​the polyurethane to adjust the speed of the stirring shaft 32, the load can be precisely controlled, which helps to reduce system fluctuations and vibrations and improve the stability of system operation.

[0028] Reference Figures 1 to 3 The cleaning assembly includes a cleaning seat 5; multiple cleaning seats 5 are arranged in a circular array on the side wall of the mixing seat 16; a water outlet 51 is provided in the middle of the side wall of the cleaning seat 5; a first water inlet 52 is fixedly connected to the middle of the side wall of the cleaning seat 5; a second water inlet 53 is fixedly connected to the middle of the side wall of the cleaning seat 5; the cleaning seat 5, the water outlet 51, the first water inlet 52, the second water inlet 53 and the mixing seat 16 are connected; during operation, after the pouring operation is completed, the worker connects multiple cleaning seats 5 and the mixing seat 16, and then connects water and cleaning fluid to the first water inlet 52 and the second water inlet 53 respectively. Because the cleaning seat 5, the water outlet 51, the first water inlet 52, the second water inlet 53 and the mixing seat 16 are connected, the water... The cleaning fluid enters the mixing seat 16 and then the valve body 11, cleaning the interior of both the valve body 11 and the mixing seat 16. The wastewater is then discharged from the outlet 13. This step, through the installation of the cleaning seat 5, outlet 51, first inlet 52, and second inlet 53, removes polyurethane and other residues, ensuring unobstructed flow through the needle valve and flexible valve core movement. This improves the flow control accuracy and response speed of the needle valve. Furthermore, the corrosive components in polyurethane and other residues can damage the needle valve material, leading to leaks, jamming, and other malfunctions. Regular cleaning with the cleaning assembly effectively removes these corrosive components, protecting the needle valve material from damage and extending its service life.

[0029] Reference Figure 2 and Figure 4The venting assembly includes an injection pipe 6; the injection pipe 6 is fixed between the connecting seat 2 and the outlet head 21; multiple vent ports 61 are provided in the middle of the side wall of the injection pipe 6; this step, by setting the injection pipe 6 and the vent ports 61, can help to vent the inside of the injection pipe 6, so that the polyurethane raw material will not be interfered with by air bubbles during the injection process, thereby improving the accuracy and efficiency of the injection. In addition, in an environment with unbalanced internal and external pressure, the vent ports 61 are used to balance the internal and external pressure, which helps to prevent the injection pipe 6 from rupturing or the polyurethane raw material from leaking due to excessive pressure difference.

[0030] Reference Figure 4 A sealing gasket 7 is fixedly connected to the middle of the side wall of the second pressing rod 22; the sealing gasket 7 is made of elastic material; this step can improve the sealing between the injection seat 23 and the connecting seat 2 by setting the sealing gasket 7, and prevent the polyurethane raw material from leaking during the injection process.

[0031] In summary: The operator adjusts the telescopic rod 14 to the appropriate length, then connects the inlet 17 to the injection assembly. Next, the polyurethane raw material is connected to the injection assembly, which injects the polyurethane raw material into the mixing seat 16, which then enters the valve body 11. At this point, the operator rotates the telescopic rod 14, causing the first pressing rod 15 to rotate. This causes the mixing assembly connected to its bottom to rotate synchronously, mixing the polyurethane raw material. Under the adjustment of the speed control component, the mixed polyurethane raw material enters the needle 12 and is discharged from the outlet 13. The pouring operation is then completed. Afterwards, the staff connects the cleaning assembly and the mixing seat 16, and then injects water and cleaning fluid into the cleaning assembly. At this time, the water and cleaning fluid will enter the mixing seat 16 and then the valve body 11 to clean the inside of the valve body 11 and the mixing seat 16. Then the wastewater is discharged from the outlet 13. The staff injects polyurethane raw material into the multiple second pressing rods 22. Under the control of the exhaust assembly, the polyurethane raw material will slowly pass through the outlet head 21 and enter the inlet 17, and then enter the mixing seat 16 from the inlet 17. Multiple sets of polyurethane raw material will gather in the mixing seat 16 and then enter the valve body 11, where they will be stirred and mixed by the mixing assembly. Polyurethane raw material enters the valve body 11. The operator rotates the telescopic rod 14, which in turn rotates the first pressing rod 15, causing the first pressing rod 15 to rotate the rotating rod 3 and the mixing plate 31. When the mixing plate 31 rotates, the stirring shaft 32 fixed to its bottom rotates synchronously. At this time, the stirring shaft 32 will stir and mix the polyurethane raw material in the valve body 11. After the polyurethane raw material in the valve body 11 is mixed, the operator rotates the stirring shaft 32, which will cause multiple stirring plates 4 to rotate synchronously. The mixed polyurethane raw material will pass through multiple speed control chambers 41 into the needle 12 and be discharged from the outlet 13. When the discharge volume decreases, the operator rotates the stirring shaft 32 again, causing the mixed polyurethane raw material to pass through other speed control chambers 41 and be discharged outward during the stirring process. After the pouring operation is completed, the operator connects multiple cleaning seats 5 and mixing seats 16, and then connects water and cleaning liquid to the first inlet 52 and the second inlet 53 respectively. Since the cleaning seat 5, outlet 51, first inlet 52, second inlet 53 and mixing seat 16 are connected, the water and cleaning liquid will enter the mixing seat 16 and then enter the valve body 11 to clean the inside of the valve body 11 and the mixing seat 16. Then the wastewater is discharged from the outlet 13.

[0032] The above is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of the claims of the present invention.

Claims

1. A needle valve for polyurethane casting, comprising a valve seat (1); characterized in that: A valve body (11) is fixedly connected to the bottom side wall of the valve seat (1); a needle (12) is fixedly connected to the bottom side wall of the valve body (11); an outlet (13) is provided in the middle of the side wall of the needle (12); the valve body (11), needle (12) and outlet (13) are all hollow and connected; a telescopic rod (14) is slidably fitted in the middle of the inner side wall of the valve seat (1); a first pressing rod (15) is fixedly connected to the bottom side wall of the telescopic rod (14); a mixing component is provided on the bottom side wall of the first pressing rod (15); the mixing component... The components are located inside the valve body (11); the bottom side wall of the mixing component is provided with a speed control component; the speed control component is located inside the valve body (11); a mixing seat (16) is assembled in the middle of the side wall of the valve body (11); a feed inlet (17) is opened in the middle of the side wall of the mixing seat (16); there are multiple feed inlets (17) and they are arranged in a circular array on the side wall of the valve body (11); an injection component is provided outside the feed inlet (17); a cleaning component is assembled in the middle of the side wall of the valve body (11); the cleaning component is located above the injection component.

2. The needle valve for polyurethane casting according to claim 1, characterized in that: The injection assembly includes multiple connecting seats (2); the multiple connecting seats (2) and the mixing seat (16) are fixedly connected; the connecting seats (2) and the feed inlet (17) are correspondingly arranged; an exhaust assembly is assembled in the middle of the inner side wall of the connecting seat (2); a liquid outlet head (21) is fixedly connected in the middle of the side wall of the exhaust assembly; the liquid outlet head (21) is located inside the feed inlet (17); a second pressing rod (22) is slidably connected in the middle of the inner side wall of the connecting seat (2); the second pressing rod (22) and the exhaust assembly are slidably connected; an injection seat (23) is threadedly connected in the middle of the side wall of the second pressing rod (22); the injection seat (23) and the connecting seat (2) are fixedly connected.

3. The needle valve for polyurethane casting according to claim 1, characterized in that: The mixing assembly includes a rotating rod (3); the rotating rod (3) is fixed to the bottom of the first pressing rod (15); a mixing plate (31) is fixed to the bottom side wall of the rotating rod (3); a stirring shaft (32) is fixedly connected to the bottom side wall of the mixing plate (31); the rotating rod (3), the mixing plate (31) and the stirring shaft (32) are all located inside the valve body (11).

4. The needle valve for polyurethane casting according to claim 1, characterized in that: The speed control component includes a stirring plate (4); there are multiple stirring plates (4) arranged in a linear array on the side wall of the stirring shaft (32); a speed control cavity (41) is provided in the middle of the side wall of the stirring plate (4); there are multiple speed control cavities (41) arranged in a circular array on the side wall of the stirring plate (4).

5. The needle valve for polyurethane casting according to claim 1, characterized in that: The cleaning assembly includes a cleaning seat (5); there are multiple cleaning seats (5) arranged in a circular array on the side wall of the mixing seat (16); a water outlet (51) is provided in the middle of the side wall of the cleaning seat (5); a first water inlet (52) is fixedly connected to the middle of the side wall of the cleaning seat (5); a second water inlet (53) is fixedly connected to the middle of the side wall of the cleaning seat (5); the cleaning seat (5), the water outlet (51), the first water inlet (52), the second water inlet (53) and the mixing seat (16) are connected.

6. The needle valve for polyurethane casting according to claim 2, characterized in that: The venting assembly includes an injection pipe (6); the injection pipe (6) is fixed between the connector (2) and the outlet head (21); a plurality of vents (61) are provided in the middle of the side wall of the injection pipe (6).

7. The needle valve for polyurethane casting according to claim 2, characterized in that: A sealing gasket (7) is fixed to the middle of the side wall of the second pressing rod (22); the sealing gasket (7) is made of elastic material.

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