CN114347352A

CN114347352A - Multifunctional environment-friendly energy-saving polyurethane high-pressure foaming machine and metering method

Info

Publication number: CN114347352A
Application number: CN202111631004.6A
Authority: CN
Inventors: 张绍文; 张兴为; 王秀荣
Original assignee: Bengbu Zhongzheng Polyurethane Foaming Equipment Co ltd
Current assignee: Bengbu Zhongzheng Polyurethane Foaming Equipment Co ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-04-15

Abstract

The invention discloses a multifunctional environment-friendly energy-saving polyurethane high-pressure foaming machine which comprises a mixing head, wherein the mixing head is connected with two feeding systems, each feeding system comprises a charging barrel, a feeding and returning device is arranged in each charging barrel, the feeding and returning device is connected with a feeding pump through a first pipeline, the feeding pump is connected with a cold-heat exchanger through a second pipeline, the cold-heat exchanger is connected with a three-way steering valve through a third pipeline, one interface of the three-way steering valve is connected with a metering pump through a fourth pipeline, the metering pump is connected with a feeding interface of the mixing head through a fifth pipeline, the other interface of the three-way steering valve is connected with the feeding and returning device through a sixth pipeline, and the returning interface of the mixing head is communicated with the sixth pipeline through a seventh pipeline. The invention has the advantages that: the storage tank, the high-low pressure change-over valve, the measuring valve and the flowmeter in the prior art are omitted, production halt caused by damage of the measuring valve and the flowmeter of the high-low pressure change-over valve is avoided, cost is saved, and the service life of equipment is prolonged.

Description

Multifunctional environment-friendly energy-saving polyurethane high-pressure foaming machine and metering method

Technical Field

The invention relates to the technical field of polyurethane production equipment, in particular to a multifunctional environment-friendly energy-saving polyurethane high-pressure foaming machine and a metering method.

Background

At present, with the continuous improvement of living standards of people, polyurethane foam materials are generally applied to various fields of production and living and the like, such as polyurethane high-speed rail sleepers, polyurethane wind power generation fan blades, polyurethane tank hubs, polyurethane automobile interior trim parts, polyurethane exterior wall heat preservation, polyurethane composite instrument platforms, polyurethane furniture, polyurethane pillows, polyurethane tires and the like. In these industries, most of the production facilities for polyurethane foam materials used employ stirring or air-blowing mixing polyurethane foam equipment. In the prior art, a polyurethane high-pressure foaming machine is connected to a high-pressure metering pump of a main machine through high-pressure rubber pipes from the outlet of a filter, and two groups of raw materials are fully mixed in a mixing head by utilizing high-speed atomization collision generated by high pressure, injected into a mold cavity and foamed and molded. However, the polyurethane high-pressure foaming machine in the prior art has the following disadvantages:

1. a high-low pressure change-over valve in the polyurethane high-pressure foaming machine frequently works, the service life is short, and a new high-low pressure change-over valve needs to be frequently replaced;

2. when products with different colors are produced, a raw material storage tank needs to be cleaned;

3. the whole occupied space of the equipment is large, the production period is long, the manufacturing cost is high, and the like.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a multifunctional environment-friendly energy-saving polyurethane high-pressure foaming machine.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention discloses a multifunctional environment-friendly energy-saving polyurethane high-pressure foaming machine which comprises a mixing head, wherein the mixing head is connected with two feeding systems, each feeding system comprises a charging barrel, a material feeding and returning device is arranged in each charging barrel, the material feeding and returning device is connected with a feeding pump through a first pipeline, the feeding pump is connected with a cold-heat exchanger through a second pipeline, the cold-heat exchanger is connected with a three-way steering valve through a third pipeline, one interface of the three-way steering valve is connected with a metering pump through a fourth pipeline, the metering pump is connected with a feeding interface of the mixing head through a fifth pipeline, the other interface of the three-way steering valve is connected with the material feeding and returning device through a sixth pipeline, and a material returning interface of the mixing head is communicated with the sixth pipeline through a seventh pipeline.

Preferably, the second pipeline is provided with an energy storage tank, and a one-way valve is arranged on the second pipeline between the feeding pump and the energy storage tank.

Preferably, the first pipeline is provided with a first filter, the fourth pipeline is provided with a second filter, and the fifth pipeline is provided with a third filter.

Preferably, a first pressure controller is installed on a fourth pipeline between the second filter and the metering pump, and a second pressure controller is installed on a fifth pipeline between the metering pump and the third filter.

Preferably, the cold-heat exchanger includes two ends, an inner tube, a middle tube and an outer tube which are coaxially connected and fixedly connected between the two ends, a heating rod is installed in the inner tube, a feeding channel is formed between the inner tube and the middle tube, circulating water is installed between the outer tube and the middle tube, a communication hole communicated with the feeding channel is formed in one side of each end, one communication hole is connected with the first pipeline, the other communication hole is connected with the second pipeline, a cold-heat circulation channel is formed between the middle tube and the outer tube, and two communication tubes communicated with the cold-heat circulation channel are arranged on the outer tube.

Preferably, the feed back device comprises a first base pipe, a fixed connecting ring is sleeved on the outer side of the first base pipe, one side of the connecting ring is fixedly connected with a first sleeve, the first sleeve and the first base pipe are coaxially arranged, a first gap is formed between the first sleeve and the first base pipe, a joint pipe communicated with the first gap is arranged on one side of the first sleeve, the joint pipe is connected with a sixth pipeline, and the first base pipe is connected with the first pipeline.

Preferably, a liquid level and temperature control device is arranged in the charging barrel and comprises a second base pipe, the outer side of the second base pipe is in threaded connection with a second sleeve, a second gap is formed between the lower end of the second sleeve and the second base pipe, an inflation pipe communicated with the second gap is arranged on one side of the second sleeve, and the inflation pipe is connected with an air storage tank.

Preferably, the metering pump is a dosing magnetic coupling metering pump.

Preferably, the energy storage tank is provided with a second liquid level sensor.

According to the metering method of the multifunctional environment-friendly energy-saving polyurethane high-pressure foaming machine, the discharge amount of one turn of a metering pump is determined according to the single-component flow of one second obtained by measuring a mixing head; determining the unit discharge amount of a metering pump in unit time according to the total discharge amount; the rotating speed of the metering pump is adjusted through the PLC, and the total discharge amount in unit time can be adjusted according to the rotating speed of the metering pump.

The invention has the advantages that: the device has the advantages that a high-low pressure change-over valve, a measuring valve and a flowmeter in the prior art are eliminated, the normal operation of the change-over valve caused by the abrasion of the parts or the crystallization of raw materials is avoided in use, the phenomenon of production stop caused by serious condition is avoided, the service life of the device can be prolonged, the continuous production operation can be realized, the measuring valve and the flowmeter in the prior art are eliminated, the influence on the metering precision caused by the blockage or abrasion of the flowmeter in the working process is avoided, a large-sized storage tank is not arranged in the whole device, the whole device is directly matched with a charging bucket produced by a manufacturer for use, the charging bucket is directly replaced when products with different colors are produced, the cleaning is not required, the workload of operators is reduced, the occupied space of the whole device is small, the device can be accommodated by an isolation room with a small area in the process of using cyclopentane foaming agent, and an air pipe arranged above a discharge nozzle of a mixing head can be directly used as a high-viscosity raw material spraying machine, when the high-viscosity material spraying machine is used, the high-viscosity material spraying machine can be used for producing the automobile spare tire isolation plate, so that the multifunctional property of equipment is realized, and the three filters are added in the process, so that the pressure of a mixture is more stable.

Drawings

FIG. 1 is a process flow diagram of a multifunctional environment-friendly energy-saving polyurethane high-pressure foaming machine;

FIG. 2 is a basic configuration diagram of a feed-back device;

FIG. 3 is a basic configuration of a cold heat exchanger;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is a basic block diagram of the liquid level and temperature control apparatus.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

The embodiment provides a multifunctional environment-friendly energy-saving polyurethane high-pressure foaming machine, which comprises a mixing head 6, wherein the mixing head 6 is connected with two feeding systems, each feeding system comprises a charging barrel 1, a feeding and returning device 8 is arranged in the charging barrel 1, the feeding and returning device 8 is connected with a feeding pump 2 through a first pipeline 11, a first filter 100 is arranged on the first pipeline 11, the feeding pump 2 is connected with a cold-heat exchanger 3 through a second pipeline 12, an energy storage tank 9 is arranged on the second pipeline 12, a second liquid level sensor is arranged in the energy storage tank 9, a check valve 400 is arranged on the second pipeline 12 between the feeding pump 2 and the energy storage tank 9, the cold-heat exchanger 3 is connected with a three-way steering valve 4 through a third pipeline 13, one of interfaces of the three-way steering valve 4 is connected with a metering pump 5 through a fourth pipeline 14, a second filter 200 is arranged on the fourth pipeline 14, a first pressure controller 500 is arranged on the fourth pipeline 14 between the second filter 200 and the metering pump 5, the metering pump 5 is for joining in marriage the magnetic coupling metering pump, and metering pump 5 is equipped with third filter 300 through the feeding interface of fifth pipeline 15 connection mixing head 6 on the fifth pipeline 15, is equipped with second pressure controller 600 on the fifth pipeline 15 between metering pump 5 and the third filter 300, and the confession feed back device 8 is connected through sixth pipeline 16 to another interface of tee bend diverter valve 4, and the feed back interface of mixing head 6 is linked together through seventh pipeline 17 and sixth pipeline 16.

Specifically, the heat exchanger 3 includes two ends 34, an inner tube 31, a middle tube 32, and an outer tube 33 coaxially connected to each other are fixedly connected between the two ends 34, a heating rod is installed in the inner tube 31, a feeding passage is formed between the inner tube 31 and the middle tube 32, a communication hole 36 communicated with the feeding passage is formed at one side of each end 34, one of the communication holes 36 is connected to the first pipeline 11, the other communication hole 36 is connected to the second pipeline 12, a cooling-heating circulation passage is formed between the middle tube 32 and the outer tube 33, two communication tubes 35 communicated with the cooling-heating circulation passage are disposed on the outer tube 33, and a circulation water tube is installed between the two communication tubes 35.

Specifically, the material feeding and returning device 8 includes a first base pipe 81, a fixed connection ring 82 is sleeved on the outer side of the first base pipe 81, a first sleeve 83 is fixedly connected to one side of the connection ring 82, the first sleeve 83 and the first base pipe 81 are coaxially arranged, a first gap 84 is formed between the first sleeve 83 and the first base pipe 81, a joint pipe 85 communicated with the first gap 84 is arranged on one side of the first sleeve 83, the joint pipe 85 is connected with the sixth pipeline 16, and the first base pipe 81 is connected with the first pipeline 11.

Specifically, a liquid level and temperature control device 7 is arranged in the charging bucket 1, the liquid level and temperature control device 7 comprises a second base pipe 71, a first liquid level sensor and a temperature detector are arranged in the second base pipe 71, the outer side of the second base pipe 71 is in threaded connection with a second sleeve 72, a second gap 73 is formed between the lower end of the second sleeve 72 and the second base pipe 71, an inflation pipe 74 communicated with the second gap 73 is arranged on one side of the second sleeve 72, and the inflation pipe 74 is connected with an air storage tank.

The method comprises the steps of continuously filling nitrogen into a charging bucket 1, preventing negative pressure from occurring in the charging bucket 1, simultaneously effectively preventing volatilization of a foaming agent of the polyether composite material and crystallization of isocyanate, when the temperature in the charging bucket 1 is too low, communicating a three-way steering valve 4 with a sixth pipeline 16, pressurizing raw materials in the charging bucket 1 through a feeding pump 2, returning the raw materials into the charging bucket 1 after being heated by a cold-heat exchanger 3, realizing continuous heating or refrigeration of the raw materials in the charging bucket 1, controlling the temperature in the charging bucket after the temperature in the charging bucket 1 is raised or lowered by communicating the three-way steering valve 4 with a fourth pipeline 14, pressurizing the raw materials in the charging bucket 1 through a metering pump 5, entering a mixing head 6, mixing and discharging the two raw materials in the mixing head 6, returning the raw materials into the charging bucket 1 through a seventh pipeline 17 and the sixth pipeline 16 after the discharging is finished, and temporarily storing part of the raw materials in an energy storage tank 9, can guarantee like this that there is the raw materials confession all the time in mixing head 6 department and go out, and level sensor is equipped with to energy storage tank 9, and level sensor passes through PLC controller control feed pump 2.

Example 2

The embodiment discloses a metering method of a multifunctional environment-friendly energy-saving polyurethane high-pressure foaming machine, which comprises the steps of determining the discharge amount of a metering pump in one turn through the single-component flow of one second obtained by measuring a mixing head; determining the discharge amount of the metering pump in each rotation; determining the unit discharge amount of a metering pump in unit time according to the total discharge amount; the measuring pump adopts servo motor or inverter motor to drive, changes inverter motor's rotational speed through PLC control servo motor's rotational speed or through the converter to can change the rotational speed of measuring pump, can adjust the total load in the unit interval according to the rotational speed of measuring pump.

Claims

1. The utility model provides a multi-functional environmental protection and energy saving polyurethane high pressure foaming machine which characterized in that: comprises a mixing head (6), the mixing head (6) is connected with two feeding systems, each feeding system comprises a charging bucket (1), a feeding and returning device (8) is arranged in the charging bucket (1), the feeding and returning device (8) is connected with a feeding pump (2) through a first pipeline (11), the feeding pump (2) is connected with a cold-heat exchanger (3) through a second pipeline (12), the cold-heat exchanger (3) is connected with a three-way steering valve (4) through a third pipeline (13), one interface of the three-way steering valve (4) is connected with a metering pump (5) through a fourth pipeline (14), the metering pump (5) is connected with a feeding interface of the mixing head (6) through a fifth pipeline (15), the other port of the three-way steering valve (4) is connected with a feed-back device (8) through a sixth pipeline (16), and a feed back interface of the mixing head (6) is communicated with a sixth pipeline (16) through a seventh pipeline (17).

2. The multifunctional environment-friendly energy-saving polyurethane high-pressure foaming machine according to claim 1, characterized in that: and an energy storage tank (9) is arranged on the second pipeline (12), and a one-way valve (400) is arranged on the second pipeline (12) between the feeding pump (2) and the energy storage tank (9).

3. The multifunctional environment-friendly energy-saving polyurethane high-pressure foaming machine according to claim 1, characterized in that: a first filter (100) is arranged on the first pipeline (11), a second filter (200) is arranged on the fourth pipeline (14), and a third filter (300) is arranged on the fifth pipeline (15).

4. The multifunctional environment-friendly energy-saving polyurethane high-pressure foaming machine according to claim 1, characterized in that: a first pressure controller (500) is arranged on a fourth pipeline (14) between the second filter (200) and the metering pump (5), and a second pressure controller (600) is arranged on a fifth pipeline (15) between the metering pump (5) and the third filter (300).

5. The multifunctional environment-friendly energy-saving polyurethane high-pressure foaming machine according to claim 1, characterized in that: cold and heat exchanger (3) include two ends (34), inner tube (31), well pipe (32), outer tube (33) of the coaxial setting of fixed connection between two ends (34), the heating rod is equipped with in inner tube (31), form feed passage between inner tube (31) and well pipe (32), every end (34) one side is equipped with intercommunicating pore (36) that are linked together with feed passage, one of them intercommunicating pore (36) with first pipeline (11) are connected, another intercommunicating pore (36) with second pipeline (12) are connected, form the cold and hot circulation passageway between well pipe (32) and outer tube (33), be equipped with two communicating pipes (35) that are linked together with the cold and hot circulation passageway on outer tube (33).

6. The multifunctional environment-friendly energy-saving polyurethane high-pressure foaming machine according to claim 1, characterized in that: supply feed back device (8) including first parent tube (81), fixed go-between (82) are cup jointed to first parent tube (81) outside, go-between (82) one side fixed connection first sleeve pipe (83), first sleeve pipe (83) with first parent tube (81) coaxial setting, first sleeve pipe (83) with form first clearance (84) between first parent tube (81), first sleeve pipe (83) one side is equipped with joint pipe (85) that are linked together with first clearance (84), joint pipe (85) with sixth pipeline (16) are connected, first parent tube (81) with first pipeline (11) are connected.

7. The multifunctional environment-friendly energy-saving polyurethane high-pressure foaming machine according to claim 1, characterized in that: liquid level and temperature control device (7) are equipped with in storage bucket (1), liquid level and temperature control device (7) include second parent tube (71), are equipped with first level sensor and temperature detector in second parent tube (71), second parent tube (71) outside threaded connection second sleeve pipe (72), form second clearance (73) between second sleeve pipe (72) lower extreme and second parent tube (71), and second sleeve pipe (72) one side is equipped with gas tube (74) that are linked together with second clearance (73), and gas holder is connected in gas tube (74).

8. The multifunctional environment-friendly energy-saving polyurethane high-pressure foaming machine according to claim 1, characterized in that: the metering pump (5) is a metering pump with a magnetic coupling.

9. The multifunctional environment-friendly energy-saving polyurethane high-pressure foaming machine according to claim 2, characterized in that: and a second liquid level sensor is arranged in the energy storage tank (9).

10. The metering method of the multifunctional environment-friendly energy-saving polyurethane high-pressure foaming machine is characterized by comprising the following steps of: determining the discharge amount of each turn of the metering pump according to the single-component flow of one second obtained by measuring the mixing head; determining the unit discharge amount of a metering pump in unit time according to the total discharge amount; the rotating speed of the metering pump is adjusted through the PLC, and the total discharge amount in unit time can be adjusted according to the rotating speed of the metering pump.