Mixed injection gun head of polyurethane foaming machine
By introducing leak-proof and sealing components into the mixing injection nozzle, the leakage problem during disassembly of the feed pipe is solved, achieving automatic sealing and stable connection between the feed pipe and the high-pressure air pipe, thus improving the practicality and safety of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LIAONING YOURONG ENERGY SAVING EQUIP CO LTD
- Filing Date
- 2025-05-27
- Publication Date
- 2026-04-21
AI Technical Summary
Traditional mixing injection nozzles are prone to material leakage when the feed pipe is disassembled, affecting the practicality and safety of the equipment. In addition, the high-pressure air pipe connection is inconvenient, affecting the stability and continuity of the equipment.
It employs leak-proof and sealing components, including a sealing cylinder, pressure rod, limit plate, and spring, to achieve automatic sealing of the feed pipe and high-pressure air pipe. The locking components and clamping plate structure ensure the stability and convenience of the connection.
It achieves a self-sealing effect when the feed pipe is disassembled, preventing raw material leakage, improving the practicality and safety of the equipment, and ensuring the convenience and stability of high-pressure air pipe connection.
Smart Images
Figure CN224145195U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection gun head technology, and in particular to a mixing injection gun head for a polyurethane foaming machine. Background Technology
[0002] With the widespread application of polyurethane foam materials in various industries such as construction, cold chain, automotive, and home appliances, the automation and precision of polyurethane foaming equipment are constantly improving. Especially in the raw material mixing and precision spraying stages, the mixing injection nozzle, as a key component of the foaming process, directly affects foaming quality and production efficiency. The mixing injection nozzle needs to mix isocyanate and polyol components at high speed under high pressure before spraying. Its structure typically needs to simultaneously meet multiple requirements, including sealing, reliability, and ease of disassembly. Therefore, ensuring the equipment's sealing and operational convenience during frequent changes to the feed pipe or high-pressure air pipe is one of the key issues in improving the stability of foaming equipment and extending its lifespan.
[0003] Currently, the common structure of mixing injection nozzles on the market generally includes a feed interface, a high-pressure air hose interface, a mixing chamber, and a triggering mechanism. The feed interface is typically connected to the feeding system via a threaded connection or a snap-fit connector, while the high-pressure air hose is connected to the nozzle interface via a bolt-locking structure or clamp. The mixing chamber contains a mixing needle or a flow-turbulence device, which rapidly mixes the two-component raw materials under high pressure before injection. After injection, the feed hose must be periodically disassembled or the mixing chamber cleaned to prevent solidified material residue from causing blockages.
[0004] However, in traditional structures, after the feed pipe is disassembled from the nozzle interface, the lack of an automatic sealing mechanism often leads to leakage of residual material at the connection point during disassembly, causing equipment contamination, material waste, and even injury to operators. This structure fails to effectively prevent residual material from flowing out when the feed interface is disconnected, reducing the practicality and safety of the equipment and affecting the continuity of polyurethane foaming operations and the cleanliness of the site. Utility Model Content
[0005] To overcome the above shortcomings, this utility model provides a mixing injection gun head for a polyurethane foaming machine, which aims to improve the problem of residual raw materials flowing out when the feed pipe of a traditional gun head is disassembled.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: a mixing injection gun head for a polyurethane foaming machine, comprising a gun head body, a connecting pipe fixedly connected to one side of the gun head body, a feeding pipe slidably connected inside the connecting pipe, a locking groove being provided inside the feeding pipe, a top block being fixedly connected inside the feeding pipe, and a leak-proof component being provided inside the connecting pipe.
[0007] The leak-proof assembly includes a sealing cylinder, the outer wall of which is fixedly connected to the inside of a connecting pipe. A pressure rod is slidably connected inside the sealing cylinder. A limiting plate is fixedly connected to the outer wall of the pressure rod, and the limiting plate is slidably connected inside the sealing cylinder. A through hole is provided inside the sealing cylinder. A baffle is fixedly connected to one end of the pressure rod. A sealing ring is fixedly connected to the outer wall of the pressure rod, and the sealing ring fits against the inner wall of the sealing cylinder. A second spring is sleeved on the outer wall of the pressure rod. One end of the second spring is fixedly connected to one side of the limiting plate, and the other end of the second spring is fixedly connected to the inside of the sealing cylinder. A locking assembly is provided on the outer wall of the connecting pipe, and a sealing assembly is provided inside the connecting pipe.
[0008] As a further description of the above technical solution:
[0009] The locking assembly includes a steel ball that is slidably connected inside the connecting tube and is fitted into a locking groove. A disassembly sleeve is slidably connected to the outer wall of the connecting tube, and a first spring is sleeved on the outer wall of the connecting tube. One end of the first spring is fixedly connected to one side of the disassembly sleeve, and the other end of the first spring is fixedly connected to the inside of the connecting tube.
[0010] As a further description of the above technical solution:
[0011] The sealing assembly includes a sealing ring, the outer wall of which is fixedly connected to the inside of the connecting pipe, and the inner wall of which is in contact with the outer wall of the feeding pipe.
[0012] As a further description of the above technical solution:
[0013] A connecting cylinder is fixedly connected to one side of the gun head body, and a limit groove is formed inside the connecting cylinder.
[0014] As a further description of the above technical solution:
[0015] A high-pressure air pipe is slidably connected inside the connecting cylinder, and a disassembly cylinder is slidably connected inside the connecting cylinder.
[0016] As a further description of the above technical solution:
[0017] One end of the disassembly cylinder is fixedly connected to a limiting plate three, which is slidably connected inside the limiting groove.
[0018] As a further description of the above technical solution:
[0019] The other end of the disassembly cylinder is fixedly connected to a limiting plate two, and the disassembly cylinder passes through the outer wall of the high-pressure air pipe.
[0020] As a further description of the above technical solution:
[0021] A clamping plate is fixedly connected inside the connecting cylinder, and the clamping plate is fitted into the high-pressure air pipe. A sealing ring three is fixedly connected to the inner wall of the connecting cylinder, and the inner wall of the sealing ring three is in contact with the outer wall of the high-pressure air pipe.
[0022] This utility model has the following beneficial effects:
[0023] 1. In this utility model, when the connecting pipe and the feeding pipe are separated, the top block and the pressure rod are separated. The tension of the second spring supports the limit plate to reset the pressure rod, so that the sealing ring and the baffle are attached to the inner wall of the sealing cylinder for sealing. This achieves the self-sealing effect of the feeding joint, solves the problem of residual raw material flowing out when the feeding pipe of the traditional gun head is disassembled, and improves the practicality of the mixing injection gun head.
[0024] 2. In this utility model, the high-pressure air pipe is locked by fitting with the clamp plate inside the connecting cylinder. Then, the high-pressure air pipe and the connecting cylinder are sealed by the sealing ring three, which achieves the effect of facilitating the connection of the high-pressure air pipe, solves the problem of easy air leakage when connecting traditional high-pressure air pipes, and improves the convenience of the mixing injection gun head. Attached Figure Description
[0025] Figure 1 This is a perspective view of the mixing injection nozzle of the polyurethane foaming machine proposed in this utility model;
[0026] Figure 2 This is a schematic diagram of the internal structure of the feed pipe of the mixing injection gun head of the polyurethane foaming machine proposed in this utility model.
[0027] Figure 3 This is a schematic diagram of the internal structure of the connecting pipe of the mixing injection gun head of the polyurethane foaming machine proposed in this utility model.
[0028] Figure 4 This is a schematic diagram of the internal structure of the connecting cylinder of the mixing injection gun head of the polyurethane foaming machine proposed in this utility model.
[0029] Figure 5 This is a schematic diagram of the clamping plate structure of the mixing injection gun head of the polyurethane foaming machine proposed in this utility model.
[0030] Legend:
[0031] 1. Gun head body; 2. Connecting pipe; 3. Feeding pipe; 4. Locking groove; 5. Top block; 6. Sealing ring one; 7. First spring; 8. Steel ball; 9. Sealing cylinder; 10. Disassembly sleeve; 11. Through hole; 12. Limiting plate one; 13. Pressure rod; 14. Baffle; 15. Sealing ring two; 16. Second spring; 17. Connecting cylinder; 18. High-pressure air pipe; 19. Clamping plate; 20. Sealing ring three; 21. Limiting groove; 22. Disassembly cylinder; 23. Limiting plate two; 24. Limiting plate three. Detailed Implementation
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0033] Reference Figures 1-3 This utility model provides an embodiment of a mixing injection gun head for a polyurethane foaming machine, including a gun head body 1. The gun head body 1 serves as the main structural component, supporting and connecting various functional components. A connecting pipe 2 is fixedly connected to one side of the gun head body 1. The connecting pipe 2 is used to connect and seal the material supply channel. A material supply pipe 3 is slidably connected inside the connecting pipe 2. The material supply pipe 3 serves as a transmission component for the raw material channel. Its pluggable structure facilitates disassembly and cleaning. A locking groove 4 is provided inside the material supply pipe 3. The locking groove 4 is used to cooperate with a locking mechanism to achieve stable fixation of the material supply pipe 3 and prevent loosening or falling off during operation. A top block 5 is fixedly connected inside the material supply pipe 3. During disassembly, the top block 5 cooperates with an internal anti-leakage mechanism to trigger the sealing mechanism to prevent raw material leakage. An anti-leakage component is provided inside the connecting pipe 2 to automatically seal the channel after the material supply pipe 3 is disassembled.
[0034] The leak-proof assembly includes a sealing cylinder 9, whose outer wall is fixedly connected to the inside of the connecting pipe 2. As the load-bearing structure of the sealing system, it provides guiding support for the pressure rod 13 and the sealing element. The pressure rod 13 is slidably connected inside the sealing cylinder 9. The pressure rod 13 can move axially during the insertion or removal of the feeding pipe 3, thereby driving the sealing structure. A limiting plate 12 is fixedly connected to the outer wall of the pressure rod 13. The limiting plate 12 is used to limit the stroke of the pressure rod 13, preventing over-stroke from causing sealing failure or component damage. The limiting plate 12 is slidably connected inside the sealing cylinder 9 to ensure that it maintains guiding and limiting accuracy during the movement of the pressure rod 13. A through hole 11 is provided inside the sealing cylinder 9. The through hole 11 is used to switch the opening or closing of the raw material channel after the pressure rod 13 is reset. A baffle 14 is fixedly connected to one end of the pressure rod 13. The baffle 14 can be adjusted when the pressure rod 13 moves to... When in the reset position, it fits against the inner wall of the sealing cylinder 9 to achieve rapid closure and sealing of the feed port, preventing leakage of residual raw materials. A sealing ring 15 is fixedly connected to the outer wall of the pressure rod 13. The sealing ring 15 fits against the inner wall of the sealing cylinder 9 to achieve sealing of the through hole 11 or cavity, ensuring the sealing performance after the system is shut down. A second spring 16 is sleeved on the outer wall of the pressure rod 13 to provide automatic reset force when the feed tube 3 is pulled out. One end of the second spring 16 is fixedly connected to one side of the limit plate 12, and the other end of the second spring 16 is fixedly connected to the inside of the sealing cylinder 9. The spring force causes the pressure rod 13 to automatically reset and complete the sealing action. A locking component is provided on the outer wall of the connecting tube 2 to mechanically limit and lock the feed tube 3 after it is inserted, ensuring a firm and reliable connection during operation. A sealing component is provided inside the connecting tube 2 to achieve an annular seal of the feed interface, preventing raw material leakage. The locking assembly includes a steel ball 8, which is slidably connected inside the connecting tube 2. As a mechanical locking element, it can be embedded in the locking groove 4 of the feeding tube 3 to form a backstop structure. The steel ball 8 engages with the locking groove 4, ensuring that the feeding tube 3 does not loosen axially or fall off after insertion. A disassembly sleeve 10 is slidably connected to the outer wall of the connecting tube 2. The disassembly sleeve 10 is used by the operator for unlocking operations. Pushing it backward releases the engagement of the steel ball 8 with the locking groove 4. A first spring 7 is sleeved on the outer wall of the connecting tube 2, providing an automatic reset function for the disassembly sleeve 10. One end of the first spring 7 is fixedly connected to one side of the disassembly sleeve 10, and the other end is fixedly connected inside the connecting tube 2, pushing the disassembly sleeve 10 back to its initial position and restoring the preload state of the locking structure. The sealing assembly includes a sealing ring 6, whose outer wall is fixedly connected inside the connecting tube 2. As the main sealing structure when the feeding tube 3 is inserted, the inner wall of the sealing ring 6 fits against the outer wall of the feeding tube 3, achieving a reliable seal between the interfaces and preventing raw material leakage to the outside.
[0035] Reference Figure 4 and Figure 5A connecting cylinder 17 is fixedly connected to one side of the gun head body 1. The connecting cylinder 17 serves as an intermediate structural component connecting the high-pressure gas pipe 18 and the gun head body 1, supporting the locking and sealing components to ensure a stable and reliable gas channel connection. A limiting groove 21 is formed inside the connecting cylinder 17. The limiting groove 21 is a guide groove for the limiting structure, allowing the internal limiting components to slide and restrict the range of motion of the components, preventing structural misalignment or overtravel during disassembly. The high-pressure gas pipe 18 is slidably connected inside the connecting cylinder 17. The high-pressure gas pipe 18 is the input pipe for the high-pressure gas channel, and its slidable structure facilitates… For disassembly and maintenance, and to provide space for subsequent sealing and locking, a disassembly cylinder 22 is slidably connected inside the connecting cylinder 17. The disassembly cylinder 22 is an operating cylinder used to control the disassembly and assembly of the high-pressure air pipe 18, and has the function of driving the movement of the limit and locking structure. One end of the disassembly cylinder 22 is fixedly connected to a limit plate 3 24. During the sliding process, the limit plate 3 24 is inserted into the limit groove 21 to control the maximum stroke of the disassembly cylinder 22, ensuring that the structural movement is controlled and stable. The limit plate 3 24 is slidably connected inside the limit groove 21, and provides guiding and limiting effects through the interlocking sliding to ensure the disassembly movement is stable. To ensure the precision and smoothness of operation, a limiting plate 23 is fixedly connected to the other end of the disassembly cylinder 22. The limiting plate 23 forms a stop fit with the inner wall of the connecting cylinder 17, which plays a role in positioning and segmented buffering, ensuring that the disassembly cylinder 22 is reset to the predetermined position. The disassembly cylinder 22 passes through the outer wall of the high-pressure air pipe 18, forming a sleeve-type structure that facilitates overall coordinated movement, while also making the operation simple and the structure compact. A locking plate 19 is fixedly connected inside the connecting cylinder 17. The locking plate 19 acts as a mechanical locking component and fits into the outer wall structure of the high-pressure air pipe 18, thereby achieving reliable fixation of the high-pressure air pipe 18 in the connected state. To prevent the air tube from coming out or loosening during operation and improve the safety of the gas channel, the clamping plate 19 fits into the high-pressure air tube 18. The positioning and locking effect is achieved through the mutually cooperating convex groove structure, which enhances the assembly stability. A sealing ring 20 is fixedly connected to the inner wall of the connecting cylinder 17. The sealing ring 20 is used to fit tightly against the outer wall of the high-pressure air tube 18 after insertion, thereby creating a sealing interface to prevent gas leakage and ensure the airtightness of the system. The inner wall of the sealing ring 20 fits against the outer wall of the high-pressure air tube 18, and the airtight connection is formed by elastic compression, which improves the airtightness and reliability of the device.
[0036] Working principle: When using the mixing injection gun head of this polyurethane foaming machine, firstly, when connecting the gun head body 1 to the feed pipe 3, the disassembly sleeve 10 slides on the outer wall of the connecting pipe 2, separating the disassembly sleeve 10 from the steel ball 8. Then, the feed pipe 3 is inserted into the connecting pipe 2. After releasing the disassembly sleeve 10, the tension of the first spring 7 supports the disassembly sleeve 10 to return to its original position and press against the steel ball 8, causing the steel ball 8 to embed into the locking groove 4, locking the feed pipe 3 and the connecting pipe 2. The feed pipe 3 and the connecting pipe 2 are connected by a sealing ring. When the first 6 is sealed, the top block 5 inside the feed pipe 3 abuts against the pressure rod 13, causing the pressure rod 13 to extend into the sealing cylinder 9. This causes the sealing ring 15 to separate from the sealing cylinder 9, and the raw material enters the gun head body 1 through the through hole 11. When the connecting pipe 2 is separated from the feed pipe 3, the top block 5 separates from the pressure rod 13. The tension of the second spring 16 supports the limit plate 12, which drives the pressure rod 13 to reset. This causes the sealing ring 15 to drive the baffle 14 to adhere to the inner wall of the sealing cylinder 9 for sealing, achieving the self-sealing effect of the feed joint.
[0037] When connecting the high-pressure air hose 18 to the connecting cylinder 17, simply insert the high-pressure air hose 18 directly into the connecting cylinder 17. The high-pressure air hose 18 is locked in place by the locking plate 19 inside the connecting cylinder 17. Then, the high-pressure air hose 18 and the connecting cylinder 17 are sealed by the sealing ring 20. When it is necessary to disassemble the high-pressure air hose 18, the limiting plate 23 presses the disassembly cylinder 22, thereby pushing the limiting plate 24 on one side of the disassembly cylinder 22 to slide in the limiting groove 21. Then, the locking plate 19 separates from the high-pressure air hose 18, allowing the high-pressure air hose 18 to be pulled out from the connecting cylinder 17, thus achieving the effect of facilitating the connection of the high-pressure air hose 18.
[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A mixing injection nozzle for a polyurethane foaming machine, comprising a nozzle body (1), characterized in that: A connecting pipe (2) is fixedly connected to one side of the gun head body (1). A feeding pipe (3) is slidably connected inside the connecting pipe (2). A locking groove (4) is opened inside the feeding pipe (3). A top block (5) is fixedly connected inside the feeding pipe (3). A leak-proof component is provided inside the connecting pipe (2). The leak-proof assembly includes a sealing cylinder (9), the outer wall of which is fixedly connected to the inside of the connecting pipe (2). A pressure rod (13) is slidably connected inside the sealing cylinder (9). A limiting plate (12) is fixedly connected to the outer wall of the pressure rod (13). The limiting plate (12) is slidably connected inside the sealing cylinder (9). A through hole (11) is provided inside the sealing cylinder (9). A baffle (14) is fixedly connected to one end of the pressure rod (13). A sealing ring (15) is fixedly connected to the outer wall of the pressure rod (13). The sealing ring (15) fits against the inner wall of the sealing cylinder (9). A second spring (16) is sleeved on the outer wall of the pressure rod (13). One end of the second spring (16) is fixedly connected to one side of the limiting plate (12). The other end of the second spring (16) is fixedly connected inside the sealing cylinder (9). A locking assembly is provided on the outer wall of the connecting pipe (2). A sealing assembly is provided inside the connecting pipe (2).
2. The polyurethane foaming machine's mixing shot gun head according to claim 1, characterized in that: The locking assembly includes a steel ball (8), which is slidably connected inside the connecting tube (2). The steel ball (8) is fitted into the locking groove (4). A disassembly sleeve (10) is slidably connected to the outer wall of the connecting tube (2). A first spring (7) is sleeved on the outer wall of the connecting tube (2). One end of the first spring (7) is fixedly connected to one side of the disassembly sleeve (10), and the other end of the first spring (7) is fixedly connected inside the connecting tube (2).
3. The mixing shot gun tip for a polyurethane foaming machine of claim 1, wherein: The sealing assembly includes a sealing ring (6), the outer wall of which is fixedly connected to the inside of the connecting pipe (2), and the inner wall of the sealing ring (6) is in contact with the outer wall of the feeding pipe (3).
4. The polyurethane foaming machine's mixing shot gun head of claim 1, wherein: A connecting cylinder (17) is fixedly connected to one side of the gun head body (1), and a limiting groove (21) is opened inside the connecting cylinder (17).
5. The polyurethane foaming machine's mixing shot gun head of claim 4, wherein: The connecting cylinder (17) is slidably connected to a high-pressure air pipe (18), and the connecting cylinder (17) is slidably connected to a disassembly cylinder (22).
6. The polyurethane foaming machine's mixing shot gun head of claim 5, wherein: One end of the disassembly cylinder (22) is fixedly connected to a limiting plate three (24), and the limiting plate three (24) is slidably connected inside the limiting groove (21).
7. The mixing injection nozzle of the polyurethane foaming machine according to claim 5, characterized in that: The other end of the disassembly cylinder (22) is fixedly connected to the limiting plate two (23), and the disassembly cylinder (22) passes through the outer wall of the high-pressure air pipe (18).
8. The polyurethane foaming machine's mixing shot gun head of claim 4, wherein: The connecting cylinder (17) is fixedly connected to a clamping plate (19), which is fitted with a high-pressure air pipe (18). The inner wall of the connecting cylinder (17) is fixedly connected to a sealing ring three (20), and the inner wall of the sealing ring three (20) is in contact with the outer wall of the high-pressure air pipe (18).