Constant pressure feeding device for polyurethane resin foaming

Abstract

The utility model discloses a kind of polyurethane resin foaming constant-pressure feed device, it is related to feed equipment technical field, including storage tank, with the fixed metering pump of storage tank discharge end communication, the fixed pipe of one pipe end and metering pump discharge end communication, the fixed mixing head of another pipe end and pipe communication, two groups are respectively fixed in the flow device of pipe two ends communication fixed switch valve and solid installation between pipe;Flow device includes transposition pipe and the pump of installation in transposition pipe communication, pump is in pipe outside, the both ends of transposition pipe are fixed and pass into pipe and its respectively one by one close two groups of switch valve;The utility model has the advantages that: when system needs to pause or interval a period of time, switch valve is closed, start pump operation, raw material on one side of pipe can be pumped to the other side, raw material on the other side of pipe is pushed to flow to one side, so raw material flow in pipe can be carried out, to slow down solidification time;Pipe is heating pipe and can provide heating function to prevent solidification.

Description

Technical Field

[0001] This utility model relates to the field of material feeding equipment technology, and more specifically to a constant pressure material feeding device for polyurethane resin foaming. Background Technology

[0002] The constant pressure feeding device (equipment) in the polyurethane resin foaming process is mainly used to ensure that raw materials (such as polyols and isocyanates) can be supplied to the mixing head at a stable pressure, thereby ensuring the consistency and stability of the quality of foam products.

[0003] The existing "Application No.: CN201811115883.5, A polyurethane foaming machine" uses an air intake mechanism to introduce compressed air into the raw material tank, thereby stabilizing the pressure and pushing the raw material downwards. The raw material then passes through the discharge pipe, metering pump, and connecting pipe in sequence into the high-pressure mixing head to provide material feeding.

[0004] During the production process, sometimes it is necessary to pause or pause the system for a period of time to debug data, change molds, perform maintenance, etc. At this time, the material in the discharge pipe and connecting pipe may solidify due to standing. Utility Model Content

[0005] The purpose of this utility model is to provide a constant pressure feeding device for polyurethane resin foaming in order to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0007] This utility model proposes a constant pressure feeding device for polyurethane resin foaming, including a storage tank, a metering pump fixedly connected to the discharge end of the storage tank, a pipe fixedly connected to the discharge end of the metering pump, and a mixing head fixedly connected to the other end of the pipe.

[0008] It also includes two sets of switch valves that are connected and fixed at both ends of the pipe and a flow device fixed in the pipe;

[0009] The flow device includes a switching tube and a pump installed in connection with the switching tube. The pump is located outside the through pipe. Both ends of the switching tube are fixedly inserted into the through pipe and are respectively close to the two sets of switch valves.

[0010] As a preferred embodiment of this utility model, the switching valve is an electric gate valve or an electric butterfly valve.

[0011] As a preferred embodiment of this invention, the pump is a diaphragm pump or a gear pump.

[0012] In a preferred embodiment of this invention, the through-tube is a heating tube.

[0013] As a preferred embodiment of the present invention, the transposition tube includes an inner layer, an outer layer fixed to the outside of the inner layer, and a heating layer disposed between the inner layer and the outer layer. A closed cavity is formed between the inner layer and the outer layer, and the heating layer is fixed inside the closed cavity. The inner layer is heat-conducting.

[0014] The beneficial effects of this utility model are as follows:

[0015] When the system needs to be paused or paused for a period of time, the switch valve is closed and the pump is started to operate, which can draw the material from one side of the pipe to the other side, and push the material from the other side of the pipe to one side. This allows the material to flow in the pipe, thereby slowing down the curing time; the pipe is a heating pipe that can provide a heating function to prevent curing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 yes Figure 1 A schematic diagram of the local structure A.

[0018] Reference numerals in the attached drawings: storage tank-1, metering pump-2, through pipe-3, mixing head-4, switch valve-5, flow device-6, switching pipe-61, pump-62, inner layer-611, outer layer-612, heating layer-613. Detailed Implementation

[0019] like Figures 1-2 As shown, this utility model proposes a constant pressure feeding device for polyurethane resin foaming, including a storage tank 1; the storage tank 1 is also provided with a pipe for continuously pressurizing its interior, and the storage tank 1 contains raw materials used for polyurethane resin foaming.

[0020] A metering pump 2 is fixedly connected to the discharge end of storage tank 1; it is connected to the bottom end of storage tank 1 and is used to accurately and steadily extract raw materials from storage tank 1.

[0021] A pipe 3 is fixedly connected to the discharge end of the metering pump 2 at one end, and a mixing head 4 is fixedly connected to the other end of the pipe 3; the raw material drawn by the metering pump 2 is introduced into the mixing head 4 through the pipe 3.

[0022] It also includes two sets of switch valves 5 that are respectively connected and fixed at both ends of the pipe 3 and a flow device 6 fixed between the pipes 3; the switch valves 5 cut off and connect the flow in the pipe 3;

[0023] Specifically: The flow device 6 includes a switching pipe 61 and a pump 62 connected and installed between the switching pipes 61. The pump 62 is located outside the through pipe 3. Both ends of the switching pipe 61 are fixedly inserted into the through pipe 3 and are respectively close to the two sets of switch valves 5. The pump 62 is installed outside the through pipe 3. The suction and discharge ends of the pump 62 are connected and fixed between the through pipes 3. The through pipe 3 is inserted into the inside of the through pipe 3. The penetration position can be sealed and fixed by means of bonding or welding.

[0024] When the system needs to be paused or paused for a period of time, the switch valve 5 is closed and the pump 62 is started to operate, which can draw the material from one side of the pipe 3 to the other side, and push the material on the other side of the pipe 3 to one side to flow. In this way, the material in the pipe 3 can flow to slow down the curing time.

[0025] It also includes a PLC controller (not shown in the figure) that is connected to an external power source, and is connected to electrical components for control of its opening and closing.

[0026] Among them, the switching valve 5 is an electric gate valve or an electric butterfly valve.

[0027] Among them, pump 62 is a diaphragm pump or a gear pump.

[0028] Among them, pipe 3 is a heating pipe; it provides a heating function to prevent curing;

[0029] Specifically: the transposition tube 61 includes an inner layer 611, an outer layer 612 fixed to the outside of the inner layer 611, and a heating layer 613 disposed between the inner layer 611 and the outer layer 612. A closed cavity is formed between the inner layer 611 and the outer layer 612, and the heating layer 613 is fixed in the closed cavity. The inner layer 611 is heat-conducting.

[0030] The inner layer 611 and the outer layer 612 are made of stainless steel; the heating layer 613 is a graphene flexible electric heating film or a resistance wire heating film; the heat generated by the heating layer 613 can be transferred through the inner layer 611 to the interior of the inner layer 611 to heat the flowing raw material, and the outer layer 612 can also transfer heat to the through pipe 3 to heat the raw material.

[0031] The control method of this utility model is to control the device by manually starting and stopping the switch. The wiring diagram of the power element and the supply of power are common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and wiring layout will not be explained in detail.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A constant pressure feeding device for polyurethane resin foaming, comprising a storage tank (1), a metering pump (2) fixedly connected to the discharge end of the storage tank (1), a pipe (3) fixedly connected to the discharge end of the metering pump (2) at one end, and a mixing head (4) fixedly connected to the other end of the pipe (3). Its features are, It also includes two sets of switch valves (5) that are connected and fixed at both ends of the pipe (3) and a flow device (6) fixed between the pipes (3); The flow device (6) includes a switching tube (61) and a pump (62) connected between the switching tube (61). The pump (62) is located outside the through pipe (3). Both ends of the switching tube (61) are fixedly inserted into the through pipe (3) and are respectively close to the two sets of switch valves (5).

2. The constant pressure feeding device for polyurethane resin foaming according to claim 1, characterized in that, The switching valve (5) is an electric gate valve or an electric butterfly valve.

3. The constant pressure feeding device for polyurethane resin foaming according to claim 1, characterized in that, The pump (62) is a diaphragm pump or a gear pump.

4. The constant pressure feeding device for polyurethane resin foaming according to claim 1, characterized in that, The through pipe (3) is a heating pipe.

5. The constant pressure feeding device for polyurethane resin foaming according to claim 4, characterized in that, The transposition tube (61) includes an inner layer (611), an outer layer (612) fixed outside the inner layer (611), and a heating layer (613) disposed between the inner layer (611) and the outer layer (612). A closed cavity is formed between the inner layer (611) and the outer layer (612), and the heating layer (613) is fixed inside the closed cavity. The inner layer (611) is heat-conducting.

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