Dual-density foaming gun head

Abstract

The utility model relates to the technical field of polyurethane foaming, in particular to a dual-density foaming gun head which comprises a gun body and a mixing mechanism, the gun body is provided with a nozzle runner for spraying mixed foaming components; the two mixing mechanisms are both arranged on the gun body, each mixing mechanism comprises a mixing flow channel and two feeding flow channels, the two feeding flow channels are both communicated with the mixing flow channel, and switch parts are arranged at the communication positions; and the mixing runners on the two mixing mechanisms are communicated with the nozzle runner. The utility model has the advantages that the two mixing mechanisms are arranged on the same gun body, and the mixing runners of the two mixing mechanisms are communicated with the same nozzle runner, so that in the use process, the two mixing mechanisms are respectively communicated with two foaming components with different densities, and the foaming components with the two densities can be quickly switched for injection; and a complicated process can be realized or the production efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of polyurethane foaming, in particular to a double-density foaming gun head. Background Art

[0002] Polyurethane foaming technology is a technology widely used in the production of foam plastics. Application scenarios include the production of car seat cushions or refrigerator insulation layers. The working principle of polyurethane foaming is to mix two single foaming components (material A and material B) through a high-pressure gun head to form a mixed foaming component and then spray it out. The mixed component undergoes a chemical reaction in a pre-prepared mold to form foam and condenses and hardens to form foam plastic.

[0003] The mixing gun head is an important component in the polyurethane foaming process. The mixing gun head in the prior art can usually only mix single-density foaming components. Due to the development of foaming technology, different positions on some foaming products need to achieve different densities. The process is complicated. When using the existing mixing gun head, the gun head needs to be replaced frequently, and the production efficiency is low. Utility Model Content

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a double-density foaming gun head.

[0005] The purpose of the utility model is achieved through the following technical solutions: a dual-density foaming gun head, including a gun body and a mixing mechanism; the gun body is provided with a nozzle flow channel for spraying mixed foaming components; two mixing mechanisms are arranged on the gun body, the mixing mechanism includes a mixing flow channel and two feed flow channels, the two feed flow channels are connected to the mixing flow channel and a switch component is arranged at the connection point; the mixing flow channels on the two mixing mechanisms are connected to the nozzle flow channel. The utility model connects the mixing flow channels of the two mixing mechanisms to the same nozzle flow channel, so that the foaming gun head can spray mixed foaming components of two different densities. In actual use, the mixing mechanism can be quickly switched to spray mixed foaming components of different densities without removing the gun head.

[0006] In some embodiments, the two feed channels are disposed opposite to the connecting points of the mixing channel. The two feed channels spray out two single-foam components respectively, and the connecting points are disposed opposite to each other so that the two single-foam components collide with each other to be evenly mixed.

[0007] In some embodiments, the mixing mechanism further includes a circulation mechanism, the circulation mechanism includes a control piston and two return flow channels corresponding to the feed flow channel, the two return flow channels are connected to the mixing flow channel, the return flow channel is arranged on the side of the feed flow channel away from the nozzle flow channel; the control piston is arranged at one end of the mixing flow channel away from the nozzle flow channel, the piston rod of the control piston is slidably arranged in the mixing flow channel, two circulation grooves are axially arranged on the outer surface of the piston rod, and when the piston rod is in an extended state, the feed flow channel, the circulation groove and the return flow channel are connected. Through the circulation mechanism, when the foaming gun head does not spray the foaming component, the circulation mechanism is used to keep the unmixed single foaming component in the pipeline flowing, so that the flow rate and temperature are in a stable state so that it can be used at any time.

[0008] In some embodiments, a sealing groove is provided on the piston rod, and a sealing ring is provided in the sealing groove. The sealing groove and the sealing ring are provided to improve the sealing performance of the piston rod and prevent leakage of the single foaming component or the mixed foaming component.

[0009] In some embodiments, a cleaning component is further included, the cleaning component including a cleaning piston, the cleaning piston is disposed at one end of the nozzle flow channel, and a cleaning piston rod on the cleaning piston is slidably disposed in the nozzle flow channel. When the spraying of the mixed foaming components is completed, the cleaning piston rod extends in the nozzle flow channel to eject all the mixed foaming components remaining in the nozzle flow channel, thereby preventing the mixed foaming components from remaining in the nozzle flow channel.

[0010] In some embodiments, the end face of the piston rod is a concave cylindrical surface, and the directrix diameter of the end face of the piston rod is equal to the diameter of the nozzle flow channel; when the piston rod is in an extended state, the end face of the piston rod is flush with the inner wall of the nozzle flow channel. The concave cylindrical surface allows the end face of the piston rod to be flush with the inner wall of the nozzle flow channel when the piston rod is extended, thereby avoiding a gap between the mixing flow channel and the nozzle flow channel to cause the mixed foaming components to remain.

[0011] In some embodiments, the cleaning piston rod is provided with a sealing groove, and a sealing ring is provided in the sealing groove. The sealing ring is provided on the cleaning piston rod so that during the ejection process of the cleaning piston rod, the mixed foaming components can be completely ejected to avoid residue.

[0012] In some embodiments, the switch component includes a needle valve, which is used to control the opening and closing of the inlet flow channel.

[0013] The utility model has the following advantages:

[0014] By arranging two mixing mechanisms on the gun body, and connecting the mixing channels of the two mixing mechanisms with the nozzle channel, the two mixing mechanisms share one nozzle channel, and the two mixing mechanisms respectively control the mixing of foaming components of two different densities. By controlling the discharge of the two mixing mechanisms, the density of the foaming components sprayed by the gun head can be quickly switched without changing the gun head, which can realize complex processes and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the dual-density nozzle of the utility model;

[0016] Figure 2 It is a front view of the dual-density nozzle of the utility model;

[0017] Figure 3 for Figure 2 Section view at EE;

[0018] Figure 4 for Figure 2 Section view at CC;

[0019] In the figure: 1. gun body; 11. nozzle flow channel; 21. mixing flow channel; 22. inlet flow channel; 23. switch component; 24. control piston; 241. piston rod; 2411. circulation groove; 25. reflux flow channel; 3. cleaning piston; 31. cleaning piston rod. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0021] The present invention is further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0022] like Figure 1-Figure 4 As shown, a dual-density foaming gun head includes a gun body 1 and a mixing mechanism; the gun body 1 is provided with a nozzle flow channel 11 for spraying mixed foaming components; two mixing mechanisms are arranged on the gun body 1, and the mixing mechanism includes a mixing flow channel 21 and two feed flow channels 22, and the two feed flow channels 22 are connected to the mixing flow channel 21 and a switch component 23 is provided at the connection point; the mixing flow channels 21 on the two mixing mechanisms are connected to the nozzle flow channel 11.

[0023] Specifically, in the present embodiment, the two mixing mechanisms are mirror-arranged with the nozzle flow channel 11 as the center, wherein the mixing flow channels 21 on the two mixing mechanisms are connected with the nozzle flow channel 11 in the radial direction of the nozzle flow channel 11, and the feed flow channel 22 is opened on the gun body 1, and the feed flow channel 22 is connected to the external high-pressure single-foaming component; the feed flow channels 22 in the two mixing mechanisms are respectively connected to two single-foaming components with different foaming densities. When the present gun head is used to spray the foaming components, the density of the sprayed mixed foaming components is switched by controlling the two mixing mechanisms to work at different times, and the density of the mixed foaming components can be quickly switched without switching the gun head during the production process, thereby realizing a complex process and improving production efficiency.

[0024] Preferably, the two feed channels 22 are arranged opposite to the connecting part of the mixing channel 21. Specifically, in this embodiment, the two feed channels 22 in a single mixing mechanism are arranged opposite to each other at the mixing channel 21. When the single-foaming components are ejected from the two feed channels 22, the two single-foaming components are ejected from the two opposite feed channels 22 and collide with each other in the mixing channel 21 to be fully mixed, thereby improving the uniformity of the mixed single-foaming components and making the mixed foaming components fully mixed.

[0025] Preferably, the mixing mechanism also includes a circulation mechanism, which includes a control piston 24 and two return flow channels 25 corresponding to the inlet flow channel 22, the two return flow channels 25 are connected to the mixing flow channel 21, and the return flow channel 25 is arranged on the side of the inlet flow channel 22 away from the nozzle flow channel 11; the control piston 24 is arranged at one end of the mixing flow channel 21 away from the nozzle flow channel 11, and the piston rod 241 of the control piston 24 is slidably arranged in the mixing flow channel 21, and two circulation grooves 2411 are axially arranged on the outer surface of the piston rod 241, and when the piston rod 241 is in an extended state, the inlet flow channel 22, the circulation groove 2411 and the return flow channel 25 are connected.

[0026] Specifically, in this embodiment, the nozzle flow channel 11 is located at the center of the gun body 1. The return flow channel 25 is opened on the gun body 1, and one inlet flow channel 22 corresponds to one return flow channel 25. The inlet flow channel 22 is arranged in parallel with the return flow channel 25, and is sequentially connected with the mixing flow channel 21 in the axial direction of the mixing flow channel 21 away from the nozzle flow channel 11; the control piston 24 is arranged on the gun body 1 and located at both ends of the gun body 1, and the piston rod 241 of the control piston 24 is arranged to slide in the mixing flow channel 21, and two circulation grooves 2411 are arranged on both sides of the outer surface of the piston rod 241 along the axial direction of the piston rod 241. In the mixing mechanism, an inlet flow channel 22, a circulation groove 2411, a return flow channel 25 and an external single-foaming component source form a circulation loop.

[0027] When the piston rod 241 of the control piston 24 is in an extended state, the circulation groove 2411 on the piston rod 241 covers the connection between the feed flow channel 22 and the return flow channel 25 and the mixing flow channel 21, so that the feed flow channel 22, the circulation groove 2411 and the return flow channel 25 are connected, and the front end of the piston rod 241 seals the connection between the mixing flow channel 21 and the nozzle flow channel 11. At this time, when the feed flow channel 22 sprays out the single foaming component, the foaming component enters the circulation groove 2411, flows to the return flow channel 25 through the circulation groove 2411, and flows back to the external single foaming component source through the return flow channel 25;

[0028] When the piston rod 241 of the control piston 24 is in a contracted state, the piston rod 241 is retracted to connect the feed channel 22, the mixing channel 21 and the nozzle channel 11. At this time, when the feed channel 22 ejects a single-foaming component, it passes through the mixing channel 21 and is ejected from the nozzle channel 11. Since both feed channels 22 are connected to the mixing channel 21 at this time, the single-foaming components ejected from the feed channel 22 are mixed to form a mixed foaming component and are ejected from the nozzle channel 11.

[0029] The circulation mechanism is used to keep the single foaming component in the mixing mechanism flowing when the mixing mechanism is not needed to spray the mixed foaming component, to prevent the single foaming component from staying in the gun head, and to keep the flow rate and temperature of the single foaming component stable so that the two single foaming components can be mixed and sprayed at any time. In this embodiment, the switch component 23 in the mixing mechanism is kept in an open state, and the piston 24 is controlled to control whether the mixing mechanism sprays the foaming component. Compared with directly controlling the switch component 23 to control whether the foaming component is sprayed, the temperature and flow rate of the sprayed mixed foaming component can be more stable, thereby improving the foaming quality.

[0030] Preferably, a sealing groove is provided on the piston rod 241, and a sealing ring is provided in the sealing groove. In this embodiment, sealing grooves are provided at both ends of the circulation groove 2411 on the piston rod 241, and sealing rings are provided in the sealing grooves, so that when the single foaming component is ejected from the inlet flow channel 22, leakage of the single foaming component and the mixed foaming component is prevented.

[0031] Preferably, a cleaning component is further included, and the cleaning component includes a cleaning piston 3, and the cleaning piston 3 is arranged at one end of the nozzle flow channel 11. A cleaning piston rod 31 on the cleaning piston 3 is slidably arranged in the nozzle flow channel 11. Specifically, in this embodiment, after the mixed foaming components are sprayed out, some of the mixed foaming components will remain in the nozzle flow channel 11. By utilizing the extension and retraction of the cleaning piston rod 31, the mixed foaming components remaining in the nozzle flow channel 11 are ejected, thereby cleaning the nozzle flow channel 11.

[0032] Preferably, the end face of the piston rod 241 is a concave cylindrical surface, and the directrix diameter of the end face of the piston rod 241 is equal to the diameter of the nozzle flow channel 11; when the piston rod 241 is in the extended state, the end face of the piston rod 241 is flush with the inner wall of the nozzle flow channel 11. Specifically, in this embodiment, when the piston rod 241 is in the extended state, the end of the piston rod 241 seals the connection between the mixing flow channel 21 and the nozzle flow channel 11, and disconnects the connection between the mixing flow channel 21 and the nozzle flow channel 11; at this time, the end face of the piston rod 241 is flush with the inner wall of the nozzle flow channel 11, avoiding the formation of a gap dead angle between the end face of the piston rod 241 and the nozzle flow channel 11, and when the cleaning piston rod 31 passes through the connection between the mixing flow channel 21 and the nozzle flow channel 11, the residual mixed foaming components can be completely ejected to avoid residue.

[0033] Preferably, a sealing groove is provided on the cleaning piston rod 31, and a sealing ring is provided in the sealing groove. When the cleaning piston rod 31 slides in the nozzle flow channel 11, the sealing ring fits the inner wall of the nozzle flow channel 11 to completely push out the mixed foaming components, making the cleaning more thorough.

[0034] Preferably, the switch component 23 includes a needle valve, which controls the opening and closing of the inlet flow channel 22 and the mixing flow channel 21 .

[0035] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the utility model by using the above-mentioned technical content without departing from the scope of the technical solution of the utility model, or modify it into an equivalent embodiment of equivalent changes. Therefore, any changes, modifications, equivalent changes and modifications made to the above embodiments based on the technology of the utility model without departing from the content of the technical solution of the utility model shall fall within the protection scope of the technical solution of the utility model.

Claims

1. A dual-density foaming gun head, characterized in that: include: A gun body (1), the gun body (1) being provided with a nozzle flow channel (11) for spraying mixed foaming components; a mixing mechanism, two mixing mechanisms being provided on the gun body (1), the mixing mechanism comprising a mixing flow channel (21) and two material inlet flow channels (22), the two material inlet flow channels (22) being connected to the mixing flow channel (21) and a switch component (23) being provided at the connection point; The mixing channels (21) on the two mixing mechanisms are both connected to the nozzle channel (11).

2. A dual-density foaming gun tip according to claim 1, characterized in that: The two inlet flow channels (22) are arranged opposite to the connecting points of the mixing flow channel (21).

3. A dual-density foaming gun tip according to claim 2, characterized in that: The mixing mechanism further comprises a circulation mechanism, which comprises a control piston (24) and two return flow channels (25) corresponding to the feed flow channel (22), the two return flow channels (25) are both connected to the mixing flow channel (21), and the return flow channel (25) is arranged on a side of the feed flow channel (22) away from the nozzle flow channel (11); the control piston (24) is arranged at one end of the mixing flow channel (21) away from the nozzle flow channel (11), and the piston rod (241) of the control piston (24) is slidably arranged in the mixing flow channel (21), and two circulation grooves (2411) are axially arranged on the outer surface of the piston rod (241), and when the piston rod (241) is in an extended state, the feed flow channel (22), the circulation groove (2411) and the return flow channel (25) are connected.

4. A dual-density foaming gun tip according to claim 3, characterized in that: The piston rod (241) is provided with a sealing groove, and a sealing ring is provided in the sealing groove.

5. A dual-density foaming gun tip according to claim 3, characterized in that: It also comprises a cleaning component, which comprises a cleaning piston (3). The cleaning piston (3) is arranged at one end of the nozzle flow channel (11), and a cleaning piston rod (31) on the cleaning piston (3) is slidably arranged in the nozzle flow channel (11).

6. A dual-density foaming gun tip according to claim 5, characterized in that: The end face of the piston rod (241) is a concave cylindrical surface, and the directrix diameter of the end face of the piston rod (241) is equal to the diameter of the nozzle flow channel (11); when the piston rod (241) is in an extended state, the end face of the piston rod (241) is flush with the inner wall of the nozzle flow channel (11).

7. A dual-density foaming gun tip according to claim 5, characterized in that: The cleaning piston rod (31) is provided with a sealing groove, and a sealing ring is provided in the sealing groove.

8. A dual-density foaming gun tip according to claim 1, characterized in that: The switch component (23) comprises a needle valve.

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