Heating nozzle structure for polyurethane foaming gun

Abstract

The utility model discloses a heating nozzle structure for a polyurethane foaming gun, which belongs to the technical field of polyurethane high-pressure foaming production equipment and comprises a needle valve body, a nozzle head and a heating component, the needle valve body consists of a needle valve shell, a needle valve stepped shaft, a disc spring, a positioning rod seat and a positioning nut, and a liquid inlet hole is arranged on the outer wall of the needle valve shell; a hollow rod body of the heating assembly sequentially penetrates through a positioning nut and a positioning rod base and then is arranged in a needle valve stepped shaft in a penetrating mode, the front end of the hollow rod body is provided with a heating rod which reaches a conical head arranged on the needle valve stepped shaft, and the tail end of the hollow rod body is provided with a cover cap which is tightly matched with a needle valve shell. The heating rod is connected with a wire which is arranged in the hollow rod body in a penetrating mode and extends out of the cap. According to the utility model, the heating component is integrated on the needle valve, so that the nozzle head can be properly heated, the stock solution is prevented from being solidified or caked at the taper hole, and the occurrence of blockage is effectively reduced. Therefore, not only can the working efficiency be improved and the downtime be reduced, but also the uniformity and the stability of foam can be ensured.

Description

Technical Field

[0001] This utility model belongs to the technical field of polyurethane foam production equipment, and provides a heating nozzle structure for a polyurethane foam gun. Background Technology

[0002] A polyurethane foaming machine is a specialized piece of equipment for the injection and foaming of polyurethane foam plastics. As long as the performance indicators of the polyurethane components meet the formulation requirements, this equipment can produce uniform and qualified foam products. Polyurethane foaming machines can be used in automotive interiors, thermal insulation wall coating, thermal insulation pipe manufacturing, and the processing of bicycle and motorcycle seat foam, among other applications.

[0003] As one of the production equipment for polyurethane foam materials, the performance level and technical specifications of polyurethane high-pressure foaming machines determine the overall level of this type of equipment. However, conventional polyurethane foaming machine spray guns have certain limitations in the process of spraying polyurethane A and B raw materials, namely, poor nozzle flow and frequent clogging, which directly leads to unsatisfactory mixing results. This seriously affects work progress and quality, making it difficult to meet the growing demand for high-quality and high-efficiency production. This situation urgently requires a new technical solution to break through existing bottlenecks and achieve better performance. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a heating nozzle structure for a polyurethane foam gun to solve the problem of easy nozzle clogging.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model provides a heating nozzle structure for a polyurethane foam gun, including a detachably connected needle valve body and nozzle head for easy cleaning and maintenance. The needle valve body consists of a needle valve housing and a needle valve stepped shaft, disc spring, positioning rod seat, and positioning nut fitted inside the needle valve housing. Its structure is simple and easy to assemble and disassemble. The needle valve housing has an axially hollow structure, and its end facing the nozzle head is inserted into the nozzle head. The nozzle head has a conical hole, with the larger end of the conical hole facing the needle valve housing. The needle valve stepped shaft has a conical head at its front end facing the nozzle head that matches the conical hole of the nozzle head. At its rear end away from the nozzle head, the needle valve stepped shaft has an upper disc spring and a positioning rod seat arranged sequentially. The system includes a positioning nut and a positioning rod seat with multiple disc springs fitted on the rod sleeve. The positioning nut is threadedly connected to the needle valve housing. An inlet hole is located on the outer wall of the needle valve housing near the nozzle head to ensure smooth flow of the raw liquid. It also includes a heating assembly. The hollow rod of the heating assembly passes through the positioning nut and positioning rod seat sequentially and is inserted into the stepped shaft of the needle valve. A heating rod is located at the front end of the hollow rod, reaching a cone-shaped tip on the stepped shaft of the needle valve. A cap is located at the rear end of the hollow rod, tightly fitted to the needle valve housing. A wire is connected to the heating rod, passing through the hollow rod and extending beyond the cap, allowing for heating at the nozzle head to prevent the raw liquid from solidifying or clumping and to prevent blockage of the cone orifice. This design allows the polyurethane foam gun to operate more stably, effectively preventing clogging and improving production efficiency and product quality. This heated nozzle design has promising application prospects in the production of polyurethane foam.

[0007] Optionally, the stepped needle valve shaft has a groove on the corresponding surface facing the disc spring to accommodate it, and a through hole in the center of the groove for the rod sleeve of the positioning rod seat to pass through. This design allows the disc spring to be accurately installed on the rear end of the stepped needle valve shaft and connected to the rod sleeve of the positioning rod seat through the through hole, ensuring the stable fixation and correct working position of the disc spring. The cushioning, shock absorption, and pre-tightening anti-loosening effects of the disc spring not only improve the assembly efficiency of the stepped needle valve shaft and the disc spring, but also increase the stability and reliability of the equipment, thereby improving the overall performance and working efficiency of the polyurethane foam gun.

[0008] Optionally, the connection between the needle valve housing and the nozzle head is a tight-fit structure. This tight-fit structure improves the sealing and stability between the two, prevents leakage of the raw liquid at the connection point, and ensures smooth spraying.

[0009] Optionally, multiple inlet holes are arranged in an inclined pattern around the circumference of the needle valve housing. This design effectively guides the raw liquid into the conical orifice of the nozzle head, ensuring smooth flow and preventing clogging and liquid accumulation. The inclined design improves the flow guiding effect of the inlet holes, allowing the raw liquid to enter the nozzle head evenly, ensuring uniform and stable flow. Furthermore, the multiple inlet holes increase the inlet flow rate, improving work efficiency and shortening the production cycle.

[0010] Optionally, the needle valve housing is provided with external threads for assembling the valve seat of the polyurethane foam gun body, and internal threads for threaded connection with the positioning nut. This internal and external thread connection structure design allows for easy connection and disassembly between the needle valve housing and the valve seat of the gun body, or between the needle valve housing and the positioning nut, ensuring not only the tightness and stability of both but also facilitating maintenance and replacement.

[0011] Optionally, a temperature sensor is installed inside the hollow rod, near the heating rod. The temperature sensor is connected to a signal wire that passes through the hollow rod and extends out of the cap. This design allows for real-time monitoring of the heating rod's temperature, ensuring the stability and safety of the heating process.

[0012] The beneficial effects of this invention are as follows: By integrating a heating component onto the needle valve, this invention can provide appropriate heating to the nozzle head, preventing the raw liquid from solidifying or clumping at the conical orifice, thereby effectively reducing clogging. Furthermore, by combining real-time monitoring with a temperature sensor to control the heating process, it can avoid problems such as overheating or insufficient temperature during raw liquid flow. The heating scheme can be adjusted according to the type of blockage and the characteristics of the raw liquid, effectively clearing blockages and ensuring the continuity and stability of production. The application of this technology provides a more intelligent and efficient solution for the cleaning and maintenance of polyurethane foam guns, which is beneficial for improving production efficiency and product quality.

[0013] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0015] Figure 1 This is a schematic diagram illustrating the application of the heating nozzle structure for the polyurethane foam gun of this utility model.

[0016] Figure 2 for Figure 1 A schematic diagram of the nozzle body structure;

[0017] Figure 3 for Figure 2 A schematic diagram of the decomposed structure;

[0018] Figure 4 for Figure 3 A schematic diagram of the heating component structure in the diagram;

[0019] Figure 5 for Figure 2 A schematic diagram showing the engagement between the nozzle head and the conical head of the needle valve spindle;

[0020] Reference numerals: Nozzle head 1, needle valve housing 2, needle valve stepped shaft 3, disc spring 4, positioning rod seat 5, positioning nut 6, heating assembly 7, heating rod 8, temperature sensor 9; conical hole 11; liquid inlet hole 21, external thread 22, internal thread 23; conical head 31, groove 32, through hole 33; rod sleeve 51; hollow rod body 71, cap 72; wire 81; signal line 91; gun body 100, valve seat 200, polyurethane A raw material nozzle 300, polyurethane B raw material nozzle 400. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0022] like Figure 1 As shown, when the heating nozzle structure mentioned in this utility model is applied to a polyurethane foam gun, the valve seat 200 of the gun body 100 is respectively provided with a polyurethane A raw liquid nozzle 300 and a polyurethane B raw liquid nozzle 400, that is, each raw liquid nozzle adopts this heating nozzle structure. Figure 2-5As shown, it includes a detachably connected needle valve body, a nozzle head 1, and a heating assembly 7. The needle valve body consists of a needle valve housing 2 and a needle valve stepped shaft 3, a disc spring 4, a positioning rod seat 5, and a positioning nut 6 fitted inside the needle valve housing 2. The needle valve housing 2 has an external thread 22 for assembly with the valve seat 200 of the polyurethane foam gun body 100, facilitating easy installation and disassembly of the needle valve. The needle valve housing 2 has an axially hollow structure, and its corresponding end facing the nozzle head 1 is inserted into the nozzle head 1. This insertion connection is a tight fit structure, which helps improve the sealing and stability between the two, preventing leakage of the original liquid at the connection point and ensuring smooth spraying from the nozzle head 1. The nozzle head... 1. A conical hole 11 is provided inside, with the larger end of the conical hole 11 facing the needle valve housing 2. The needle valve stepped shaft 3 has a conical head 31 at its front end facing the nozzle head 1, which is adapted to the conical hole 11 of the nozzle head 1, so that the original liquid is sprayed out from the nozzle head 1 through the gap between the conical head 31 and the conical hole 11. The needle valve stepped shaft 3 has a disc spring 4, a positioning rod seat 5 and a positioning nut 6 arranged in sequence at its rear end away from the nozzle head 1. Multiple disc springs 4 are fitted on the rod sleeve 51 of the positioning rod seat 5. The needle valve stepped shaft 3 has a groove 32 on the corresponding surface facing the disc springs 4 to accommodate a portion of the disc springs 4. The center of the groove 32 has a through hole 33 for the rod sleeve 51 of the positioning rod seat 5 to pass through, so that the disc springs 4 can be accurately positioned. The ground cover is installed on the rear end of the needle valve stepped shaft 3 and connected to the rod sleeve 51 of the positioning rod seat 5 through the through hole 33, ensuring the stable fixation and correct working position of the disc spring 4. The buffering, shock absorption, and pre-tightening anti-loosening effect of the disc spring 4 can not only improve the assembly efficiency of the needle valve stepped shaft 3 and the disc spring 4, but also increase the stability and reliability of the needle valve, thereby improving the performance and working efficiency of the entire polyurethane foam gun. The positioning nut 6 is threaded to the needle valve housing 2, that is, the needle valve housing 2 is provided with an internal thread 23 that is threaded to the positioning nut 6, and the disc spring 4 is locked through the threaded engagement. The outer wall of the needle valve housing 2 is provided with a liquid inlet hole 21 near the nozzle head 1, and the liquid inlet... Multiple inclined holes are arranged around the circumference of the needle valve housing 2. The guiding effect of the liquid inlet hole 21 allows the raw liquid to enter the nozzle head evenly, ensuring the uniformity and stability of the raw liquid flow. The hollow rod 71 of the heating component 7 passes through the positioning nut 6 and the positioning rod seat 5 in sequence and is inserted into the needle valve stepped shaft 3. The front end of the hollow rod 71 is provided with a heating rod 8 that reaches the cone head 31 provided on the needle valve stepped shaft 3, and the rear end of the hollow rod 71 is provided with a cap 72 that fits tightly on the needle valve housing 2. The heating rod 8 is connected to a wire 81 that passes through the hollow rod 71 and extends out of the cap 72, which can heat the nozzle head and prevent the raw liquid from solidifying or clumping, thus preventing the cone hole from becoming blocked.

[0023] In this embodiment, a temperature sensor 9 is installed inside the hollow rod 71 near the heating rod 8. This temperature sensor 9 is connected to a signal line 91 that passes through the hollow rod 71 and extends out of the cap 72. This allows for real-time monitoring of the heating rod's temperature, ensuring the stability and safety of the heating process. Furthermore, the temperature sensor is connected to an intelligent temperature monitoring system via the signal line, enabling monitoring and control of the heating process. The intelligent temperature monitoring system allows for different heating schemes to be set according to the type of blockage and the characteristics of the original liquid during the heating process, improving the blockage removal efficiency and the flow effect of the original liquid.

[0024] The above-described solution involves inserting a heating rod into a specific position on the conical tip of the needle valve stepped shaft. This allows for rapid heat transfer to the front end of the needle valve stepped shaft and the nozzle head area, softening or decomposing the blockage caused by the raw material. Monitoring with a temperature sensor allows for different heating schemes to be set based on the type of blockage and the characteristics of the raw material, ensuring that the heating process does not damage the nozzle head and surrounding components, and improving cleaning efficiency. This technology provides a more intelligent and efficient solution for the cleaning and maintenance of polyurethane foam guns, contributing to improved production efficiency and product quality.

[0025] This polyurethane foam gun uses a heated nozzle structure that integrates a precision heating mechanism inside the needle valve, solving the technical problem of polyurethane concentrate solidifying and clogging at the nozzle cone orifice, while maintaining the valve body's compactness and maintainability. Specific technical breakthroughs are as follows.

[0026] 1. Deeply integrated design of the heating component. The hollow rod of the heating component passes sequentially through the positioning nut and positioning rod seat before inserting into the stepped shaft of the needle valve, with the front heating rod reaching the cone head. The resulting technical benefits include: precise heating of the high-clogging area (the gap between the cone head and the cone hole), preventing the original liquid from solidifying (traditional solutions often use external heating, which is inefficient and easily damages components). Simultaneously, it does not occupy external space, maintaining the original compact structure of the valve body and is compatible with existing foaming gun assembly interfaces (directly connecting to the gun body valve seat via the external thread of the needle valve housing).

[0027] 2. Temperature Closed-Loop Control Mechanism. A temperature sensor is added next to the heating rod, with signal lines and wires running parallel through the hollow rod, extending to the cap and connecting to the intelligent monitoring system. The resulting technical benefits include: real-time monitoring of the cone temperature and dynamic adjustment of the heating strategy (e.g., setting temperature thresholds based on the type of concentrate), preventing overheating damage or secondary blockages caused by insufficient temperature. It also enables "on-demand heating," reducing energy consumption and improving unblocking efficiency (compared to constant-temperature heating solutions without temperature control).

[0028] 3. Compatibility design between disc spring preload and heating assembly. A groove at the rear end of the needle valve stepped shaft accommodates the disc spring, and a through hole allows the positioning rod holder's sleeve to pass through. The hollow rod body passes through the positioning rod holder and the center of the disc spring, forming a "coaxial nesting." The resulting technical benefits are: the disc spring maintains the preload of the needle valve stepped shaft, ensuring a seal between the cone head and the cone hole, while providing a stable installation channel for the heating assembly. Furthermore, removing the positioning nut allows for maintenance of the heating assembly without affecting the core structure of the valve body (resolving assembly conflicts between the heating module and the dynamic valve core).

[0029] In summary, the core inventiveness of this application lies in the deep integration of the heating component with the needle valve body (a hollow rod penetrating a multi-layered structure + a heating rod reaching the cone head), enabling precise temperature control heating of high-clogging areas within the valve body, while also being compatible with disc spring pre-tensioning and standardized interfaces. This overall design helps improve the anti-clogging technology of polyurethane foam gun nozzles, solving the pain points of traditional solutions such as low heating efficiency and cumbersome maintenance.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A heating nozzle structure for a polyurethane foam gun, characterized in that, The device includes a detachably connected needle valve body and a nozzle head (1). The needle valve body consists of a needle valve housing (2) and a needle valve stepped shaft (3), a disc spring (4), a positioning rod seat (5), and a positioning nut (6) sleeved within the needle valve housing (2). The needle valve housing (2) has an axially hollow structure, and its corresponding end facing the nozzle head (1) is inserted into the nozzle head (1). The nozzle head (1) has a conical hole (11), and the large end of the conical hole (11) faces the needle valve housing (2). The needle valve stepped shaft (3) has a conical head (31) at its front end facing the nozzle head (1) that matches the conical hole (11) of the nozzle head (1). The disc spring (4), the positioning rod seat (5), and the positioning nut (6) are sequentially mounted on the rear end of the needle valve stepped shaft (3) away from the nozzle head (1). Multiple disc springs (4) are sleeved on the sleeve (51) of the positioning rod seat (5), and the positioning nut (6) is threadedly connected to the needle valve housing (2); an inlet hole (21) is opened on the outer wall of the needle valve housing (2) near the nozzle head (1); a heating assembly (7) is also included, the hollow rod (71) of the heating assembly (7) passes through the positioning nut (6) and the positioning rod seat (5) in sequence and is inserted into the needle valve stepped shaft (3), and the front end of the hollow rod (71) is provided with a heating rod (8) that reaches the cone (31) provided on the needle valve stepped shaft (3), and the tail end of the hollow rod (71) is provided with a cap (72) that is tightly fitted on the needle valve housing (2), and the heating rod (8) is connected with a wire (81) that passes through the hollow rod (71) and extends out of the cap (72).

2. The heating nozzle structure for a polyurethane foam gun according to claim 1, characterized in that, The needle valve stepped shaft (3) has a groove (32) on the corresponding surface facing the disc spring (4) for accommodating the disc spring (4), and a through hole (33) is provided in the center of the groove (32) for the rod sleeve (51) of the positioning rod seat (5) to pass through.

3. The heating nozzle structure for a polyurethane foam gun according to claim 1, characterized in that, The insertion connection between the needle valve housing (2) and the nozzle head (1) is a tight fit structure.

4. The heating nozzle structure for a polyurethane foam gun according to claim 1, characterized in that, The liquid inlet holes are inclined and are arranged in multiple circumferentially on the needle valve housing (2).

5. The heating nozzle structure for a polyurethane foam gun according to claim 1, characterized in that, The needle valve housing (2) is provided with an external thread (22) that is assembled with the valve seat (200) of the gun body (100) of the polyurethane foam gun, and the needle valve housing (2) is provided with an internal thread (23) that is threadedly connected to the positioning nut (6).

6. The heating nozzle structure for a polyurethane foam gun according to any one of claims 1-5, characterized in that, A temperature sensor (9) is provided inside the hollow rod (71) and near the heating rod (8). The temperature sensor (9) is connected to a signal line (91) that passes through the hollow rod (71) and extends out of the cap (72).

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