Polyurethane high-pressure foaming machine

Abstract

The utility model discloses a polyurethane high-pressure foaming machine, which comprises a charging bucket system, a metering and conveying system, a temperature control system and a controller, the charging bucket system is arranged on a charging bucket bottom frame, the metering and conveying system is arranged on a metering unit bottom frame, and the charging bucket bottom frame and the metering unit bottom frame are independently arranged. The charging bucket system is connected with the temperature control system, the charging bucket system is connected with the metering and conveying system through a connecting pipe, the mixing head is connected to the metering and conveying system, the two raw materials are mixed in the mixing head and then injected into a mold, and the charging bucket system, the metering and conveying system and the temperature control system are all controlled by a controller. The device is reasonable in structure and convenient to use, two metering pumps can be respectively and independently driven, flow calibration is completed through single-channel circulation of the mixing head, calibration precision is high, the service life of equipment is prolonged, the outage rate is reduced, and the capacity of customers is also improved.

Description

Technical Field

[0001] The utility model relates to the field of foaming machines, in particular to a polyurethane high-pressure foaming machine. Background Art

[0002] At present, with the continuous improvement of people's living standards, polyurethane foam materials are widely used in many fields such as production and life, such as polyurethane insulation materials, polyurethane rolling shutter doors and windows, polyurethane tiles, polyurethane composite glass, polyurethane furniture, polyurethane flower pots and polyurethane guardrails. Some existing foaming machines are composed of a material tank device, a bottom frame, a quantitative metering plunger pump, a magnetic coupling, a drive motor, a flow meter, a tubular heat exchanger, a material tank heating rod, a low-pressure filter, a mixing head and a pipeline system. The structural structure of the existing products causes the following deficiencies and defects:

[0003] The existing similar products have an overall frame structure, and they need to be made in a non-standard way to meet different application requirements.

[0004] The metering pump is a quantitative pump with an open control system.

[0005] Flow calibration is done through a manual ball valve;

[0006] The temperature control of the material tank is achieved through electric heating rods and tubular heat exchangers;

[0007] The metering pump is only equipped with a low-pressure filter before the metering pump.

[0008] Therefore, the existing technology needs to be improved. Utility Model Content

[0009] In order to overcome the shortcomings of the existing technology, a polyurethane high-pressure foaming machine is now provided to improve the metering accuracy and metering range, increase the service life of the equipment, and increase customer production capacity.

[0010] A polyurethane high-pressure foaming machine comprises a material tank system, a metering and conveying system, a temperature control system and a controller, wherein the material tank system is installed on a bottom frame of the material tank, the metering and conveying system is installed on a bottom frame of a metering unit, the bottom frame of the material tank and the bottom frame of the metering unit are independently arranged, the material tank system is connected to the temperature control system, the material tank system is connected to the metering and conveying system through a connecting pipe, a mixing head is connected to the metering and conveying system, two raw materials are mixed in the mixing head and then injected into a mold, and the material tank system, the metering and conveying system and the temperature control system are all controlled by the controller.

[0011] Furthermore, the material tank system, the temperature control system and the metering and conveying system are respectively provided with two sets, and each set of the material tank system is connected to the corresponding metering and conveying system.

[0012] Furthermore, each set of the tank system comprises a tank body, an air-controlled ball valve above the tank body, a liquid level gauge inside the tank body, a water jacket pressure safety valve and a tank body pre-pressure safety valve.

[0013] Furthermore, a stirring device is installed on the material tank body, and the stirring device includes a stirring motor, a connecting shaft, a stirring rod and a stirring blade connected in sequence. A seal is also provided between the connecting shaft and the material tank body, and the raw materials in the material tank body are stirred by the stirring device.

[0014] Furthermore, an adsorption air dryer is provided in front of the tank body.

[0015] Furthermore, each set of the temperature control system includes a heat exchanger and a mold temperature controller, and each set of the temperature control system is connected to a corresponding material tank system.

[0016] Furthermore, each set of the metering and conveying system includes a motor, a magnetic coupling, a metering pump, a high-pressure filter, a flow meter, a pressure switch and a hydraulic station that are electrically connected in sequence. The hydraulic station is arranged on the bottom frame of the metering unit. A corresponding liquid receiving tray is provided at the bottom of the hydraulic station. After the motor is driven by the controller, it drives the magnetic coupling to work.

[0017] Furthermore, the output shaft of the motor is connected to the inner rotor of the magnetic coupling, the input shaft of the metering pump is connected to the outer magnet of the magnetic coupling, the inner rotor is driven to rotate by the motor, and the metering pump is driven to rotate by the outer magnet.

[0018] Furthermore, the metering pump is a variable displacement piston pump, which is provided with a hand wheel and a driving motor, and high-precision delivery metering of the product discharge volume is achieved by adjusting the frequency of the hand wheel and the driving motor.

[0019] Furthermore, a low-pressure filter is provided between the discharge port of the material tank system and the feed port of the metering and conveying system.

[0020] The utility model uses the above technical solution, so that it has the following beneficial effects:

[0021] Creative structural design and flexible layout;

[0022] Reduce the risk of raw material crystallization;

[0023] Improve temperature control accuracy;

[0024] Improve measurement accuracy and measurement range;

[0025] Improve the convenience of daily operation and maintenance;

[0026] Increase equipment service life, reduce downtime, and improve customer productivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the first, second and third embodiments of the utility model;

[0028] Figure 2 for Figure 1 A schematic diagram of the structure of the metering and conveying system;

[0029] Figure 3 This is an internal cross-sectional view of the stirring device in the first embodiment of the utility model;

[0030] Figure 4 It is an overall top view of the first and second embodiments of the utility model;

[0031] Figure 5 This is the working principle diagram of the utility model polyurethane high pressure foaming machine;

[0032] Figure 6 , 7 , 8, 9 are Figure 5 Exploded view of the working principle diagram.

[0033] The reference numerals in the accompanying drawings of the specification are as follows:

[0034] Material tank system 1, metering and conveying system 2, temperature control system 3, controller 4, low-pressure filter 5, adsorption air dryer 6, material tank body 11, air-controlled ball valve 12, stirring device 13, stirring motor 131, connecting shaft 132, stirring rod 133, stirring blade 134, motor 21, magnetic coupling 22, metering pump 23, high-pressure filter 24, flow meter 25, hydraulic station 26, liquid receiving tray 27, heat exchanger 31, mold temperature controller 32. DETAILED DESCRIPTION

[0035] In order to make the technical means, creative features, objectives and effects achieved by the utility model easier to understand, the utility model is further described below in conjunction with specific embodiments and drawings.

[0036] like Figure 1 , Figure 2As shown, the first embodiment of the utility model provides a polyurethane high-pressure foaming machine, including a material tank system 1, a metering and conveying system 2, a temperature control system 3 and a controller 4, the material tank system 1 is installed on the bottom frame of the material tank, the metering and conveying system 2 is installed on the bottom frame of the metering unit, the bottom frame of the material tank and the bottom frame of the metering unit are independently arranged, the material tank system 1 is connected to the temperature control system 3, the material tank system 1 is connected to the metering and conveying system 2 through a connecting pipe, the mixing head is connected to the metering and conveying system 2, a raw material pipe and a hydraulic pipe are provided at the outlet of the foaming machine, the foaming machine is connected to the mixing head through the middle pipeline of the system, the two raw materials are mixed in the mixing head and then injected into the mold, and the material tank system 1, the metering and conveying system 2 and the temperature control system 3 are all controlled by the controller 4.

[0037] Specifically, the material tank system 1, the temperature control system 3 and the metering and conveying system 2 are respectively provided with two sets, each set of the material tank system 1 is connected to the corresponding metering and conveying system 2, and each set of the material tank system 1 includes a material tank body 11, an air-controlled ball valve 12 (Nanjing Hantai HV series or similar products, composed of a pneumatic actuator and a ball valve) above the material tank body 11, a liquid level gauge inside the material tank body 11 (PAKU-LF800 series magnetic flap level gauge or similar products), a water jacket pressure safety valve and a material tank body pre-pressure safety valve (not shown in the figure), and the above safety valves are all HEROSE-06380 series or similar products. When the liquid level meter detects that the material level in the material tank body 11 is lower than the set value, it will send a refilling signal to the controller 4. The controller 4 sends a control signal to the pneumatic actuator on the pneumatic ball valve 12 and the customer's feeding system to open the ball valve and let the feeding system feed the material. In this way, the raw materials will flow into the material tank for refilling. When the material level reaches another set value, the controller 4 sends a control signal to the pneumatic actuator on the pneumatic ball valve 12 and the customer's feeding system to close the ball valve and stop the feeding system from feeding the material.

[0038] The subsequent metering pump of the material tank must have a certain inlet pressure to maintain normal operation. This pressure comes from the pre-pressure generated by compressed air inside the material tank. A compressed air inlet pipeline is installed on the top of the material tank. The pre-pressure safety valve is used to prevent the pressure inside the material tank from being too high. Once the pressure exceeds the set value of the safety valve, the safety valve will open and the material tank will be depressurized. The water jacket of the material tank is filled with water to heat or cool the raw materials in the material tank to keep the raw materials within the set temperature range. The water jacket pressure safety valve is used to prevent the pressure inside the water jacket from being too high. Once the pressure exceeds the set value of the safety valve, the safety valve will open and the water jacket will be depressurized.

[0039] In addition, combined Figure 1 , Figure 2 , Figure 3As shown, a stirring device 13 is installed on the tank body 11, and the stirring device 13 includes a stirring motor 131, a connecting shaft 132, a stirring rod 133 and a stirring blade 134 connected in sequence. A sealing member (not shown in the figure) is also provided between the connecting shaft 132 and the tank body 11, and the raw materials in the tank body 11 are stirred by the stirring device 13. Each set of metering and conveying system 2 includes a motor 21, a magnetic coupling 22, a metering pump 23, a high-pressure filter 24, a flow meter 25, a pressure switch and a hydraulic station 26 which are electrically connected in sequence. The hydraulic station 26 is arranged on the bottom frame of the metering unit, and a corresponding liquid receiving tray 27 is arranged at the bottom of the hydraulic station 26. The liquid receiving tray 27 can be manually drawn out. After the motor 21 is driven by the controller 4, the magnetic coupling 22 is driven to work; a high-pressure filter 24 is provided after the metering pump 23, which can filter impurities in the raw materials, reduce the wear of the metering pump 23 and the mixing head, and reduce the unplanned downtime rate.

[0040] It should be noted that the output shaft of the motor 21 is connected to the inner rotor of the magnetic coupling 22, and the input shaft of the metering pump 23 is connected to the outer magnet of the magnetic coupling 22. When the motor 21 drives the inner rotor to rotate, the outer magnet drives the metering pump 23 to rotate synchronously under the action of the magnetic force, thereby transmitting the power of the motor 21 to the metering pump 23. The hydraulic station 26 provides power for the mixing head piston movement, with one working oil circuit and one return oil circuit, which are respectively connected to the two hydraulic solenoid valves that control the two pistons of the mixing head through intermediate pipelines. In addition, the metering pump 23 is a variable piston pump. The two variable piston pumps are arranged in the same direction. The variable piston pump is provided with an adjusting handwheel and a driving motor (not shown in the figure). The high-precision delivery metering of the product discharge volume is achieved by adjusting the frequency of the adjusting handwheel and the driving motor. The metering accuracy can reach ±0.5%, and the discharge volume range is 10%-100% of the standard process of the metering pump 23; the adjusting handwheel, flow meter and hydraulic station 26 of the metering pump 23 are arranged toward the outside of the equipment for easy operation and maintenance. The system uses ferrule-type hard pipes and hoses for connection.

[0041] The two temperature control systems 3 respectively include a heat exchanger 31 and a mold temperature controller 32. The heat exchanger 31 is made of all stainless steel fusion welding products, and the mold temperature controller 32 is connected to the tank body 11 and the heat exchanger 31 through a sleeve-type hard pipe and a hose. It has high temperature control accuracy and fast response. The use of all stainless steel plate heat exchangers can prevent chemical reactions between raw materials and non-ferrous metals and improve the service life of the product.

[0042] In specific use, combined with Figures 5 to 9As shown, two sets of material tank systems 1 and temperature control system 3 are placed on a separate chassis, and a forklift interface is set; after the raw materials are mixed by the mixing head, the customer's mold is provided with a material injection port, and the controller 4 of the foaming machine issues an instruction, the mixing head is opened for injection, and the two raw materials are stored, transported, metered, and mixed. The mixed raw materials are inserted into the injection port manually or by a robot at the set temperature, pressure, and flow rate. When the injection volume set by the system is reached, the mixing head is closed, and one injection is completed to realize the production of polyurethane foam products. When it is necessary to inject again, repeat the above operation.

[0043] The polyurethane high-pressure foaming machine of the first embodiment of the utility model has a reasonable structure and is easy to use. It can drive two metering pumps 23 separately and independently. The flow calibration is completed through the single-channel circulation of the mixing head. The calibration accuracy is high, which improves the service life of the equipment, reduces the downtime rate, and also improves the customer's production capacity.

[0044] The second embodiment of the utility model provides a polyurethane high-pressure foaming machine, the technical features of which are basically the same as those of the first embodiment, the main difference being that: Figure 1 and Figure 4 As shown, a low-pressure filter 5 is also provided between the discharge port of the material tank system 1 and the feed port of the metering and conveying system 2. The low-pressure filter 5 is arranged before the metering pump 23, and a pipeline is set to connect the discharge port of the material tank body 11 and the feed port of the metering pump 23 through a connecting pipeline, so as to filter out impurities with a particle size greater than 200um in the raw material, protect other subsequent components of the system, and increase service life.

[0045] The third embodiment of the present utility model provides a polyurethane high-pressure foaming machine, the technical features of which are basically the same as those of the first embodiment, the main difference being that: Figure 1 As shown, an adsorption air dryer 6 is provided in front of the material tank body 11, which can reduce the moisture content in the compressed air and reduce the probability of the moisture reacting with the raw materials to form crystals.

[0046] The above describes the specific embodiments of the utility model. It should be understood that the utility model is not limited to the above specific embodiments, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; those skilled in the art can make various modifications or modifications within the scope of the claims to make some simple deductions, deformations or substitutions, which does not affect the substantive content of the utility model.

Claims

1. A polyurethane high pressure foaming machine, characterized in that: It includes a material tank system, a metering and conveying system, a temperature control system and a controller. The material tank system is installed on the bottom frame of the material tank, the metering and conveying system is installed on the bottom frame of the metering unit, the bottom frame of the material tank and the bottom frame of the metering unit are independently arranged, the material tank system is connected to the temperature control system, the material tank system is connected to the metering and conveying system through a connecting pipe, the mixing head is connected to the metering and conveying system, the two raw materials are mixed in the mixing head and then injected into the mold, and the material tank system, the metering and conveying system and the temperature control system are all controlled by the controller.

2. The polyurethane high pressure foaming machine according to claim 1, characterized in that: The material tank system, temperature control system and metering and conveying system are respectively provided with two sets, and each set of the material tank system is connected with the corresponding metering and conveying system.

3. The polyurethane high pressure foaming machine according to claim 1, characterized in that: Each set of the tank system comprises a tank body, an air-controlled ball valve above the tank body, a liquid level gauge inside the tank body, a water jacket pressure safety valve and a tank body pre-pressure safety valve.

4. The polyurethane high pressure foaming machine according to claim 3, characterized in that: A stirring device is installed on the material tank body, and the stirring device includes a stirring motor, a connecting shaft, a stirring rod and a stirring blade connected in sequence. A sealing member is also provided between the connecting shaft and the material tank body, and the raw materials in the material tank body are stirred by the stirring device.

5. The polyurethane high pressure foaming machine according to claim 3, characterized in that: An adsorption air dryer is arranged in front of the material tank body.

6. The polyurethane high pressure foaming machine according to claim 1, characterized in that: Each set of the temperature control system comprises a heat exchanger and a mold temperature controller, and each set of the temperature control system is connected to a corresponding material tank system.

7. The polyurethane high pressure foaming machine according to claim 1, characterized in that: Each set of the metering and conveying system includes a motor, a magnetic coupling, a metering pump, a high-pressure filter, a flow meter, a pressure switch and a hydraulic station which are electrically connected in sequence. The hydraulic station is arranged on the bottom frame of the metering unit. A corresponding liquid receiving tray is arranged at the bottom of the hydraulic station. After the motor is driven by the controller, it drives the magnetic coupling to work.

8. The polyurethane high pressure foaming machine according to claim 7, characterized in that: The output shaft of the motor is connected to the inner rotor of the magnetic coupling, the input shaft of the metering pump is connected to the outer magnet of the magnetic coupling, the inner rotor is driven to rotate by the motor, and the metering pump is driven to rotate by the outer magnet.

9. The polyurethane high pressure foaming machine according to claim 7, characterized in that: The metering pump is a variable displacement piston pump, which is provided with a hand wheel and a driving motor. High-precision delivery metering of the product discharge volume is achieved by adjusting the frequency of the hand wheel and the driving motor.

10. The polyurethane high pressure foaming machine according to claim 1, characterized in that: A low-pressure filter is provided between the discharge port of the material tank system and the feed port of the metering and conveying system.

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