Vacuum stirring and pouring integrated device for pouring and forming high-viscosity polyurethane

Abstract

The utility model relates to a vacuum stirring and pouring integrated device for pouring high-viscosity polyurethane. The vacuum stirring and pouring integrated device comprises a box body and an upper cover movably connected with the box body, when the upper cover is closed to the upper part of the box body, a sealed space can be formed; a stirring device and a pouring device are arranged in the box body; wherein a stirring hole, an air exhaust hole and a pouring hole are respectively formed in the upper cover; the stirring hole is connected with a stirring structure of the stirring device; the air exhaust hole is connected with an external air pump; and the pouring hole is connected with a pouring device through a pipeline. Vacuum stirring and vacuum pouring are carried out in one set of equipment and can be realized at the same time, the operation is simple and easy, the equipment investment cost is reduced, high-pressure and low-pressure pouring machines with high price do not need to be purchased, and the process operation is also convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to high viscosity polyurethane forming's pouring device, specifically relates to a kind of for pouring high viscosity polyurethane forming's vacuum stirring pouring integrated device. BACKGROUND

[0002] Polyurethane is composed of two kinds of microphase separation structures of hard segment and soft segment, so it can be designed into elastomer material with high damping performance by different combination of hard segment and soft segment, for special use conditions with strict vibration reduction demand. The raw material of high-damping polyurethane elastomer is composed of polyurethane prepolymer and chain extender, and the viscosity of the prepolymer is large, which is easy to introduce air during mixing and stirring with the chain extender. At the same time, if atmospheric pressure pouring is used, air is easily mixed in the process, forming bubbles, which is difficult to defoam under atmospheric pressure, and needs to be defoamed by vacuum means to ensure that the reaction product after mixing of the raw material has no bubble structure and the performance of the final product reaches the best state.

[0003] At present, the existing high viscosity polyurethane liquid material usually adopts atmospheric pressure pouring or vacuum pouring for the production of elastomer. However, in the production process, due to the high viscosity of the glue liquid, air bubbles are easily mixed and produced during stirring and pouring, and a large size vacuum stirring device and vacuum pouring device need to be separately configured, which has certain disadvantages in cost, visual visualization and manufacturing convenience. Therefore, it is necessary to propose a further solution to the above problems.

[0004] For the pouring forming of high viscosity polyurethane, the existing technology mainly defoams from two aspects: ① stirring process: add vacuum stirring device to avoid introducing additional air during stirring and mixing of polyurethane prepolymer and chain extender; ② pouring process: use vacuum means, such as designing airtight vacuum introduction device. Both methods need to be equipped with corresponding equipment separately, and for products with skeleton structure, the vacuum introduction device is airtight structure, which cannot be observed by naked eye during the introduction process, and the position of the problem cannot be well judged and analyzed. In the utility model CN215397028U, the technology of visual vacuum pouring is also used, but only an acrylic transparent observation port is left on the mold cover, which can be opened and closed. This technology does not include the use of vacuum stirring. For example, CN201604247U, CN210148529U and other patents only introduce a polyurethane vacuum pouring device, but do not have the functions of vacuum stirring and full transparent visualization.

[0005] The existing technology needs to separately equip vacuum stirring and vacuum pouring equipment, which has high equipment size and total cost; for the vacuum pouring tool of polyurethane elastomer with skeleton, it is usually airtight structure, and the flow of glue liquid cannot be directly and quickly observed by naked eye. Utility model content

[0006] The utility model discloses a kind of vacuum stirring pouring integrated devices for pouring high viscosity polyurethane forming. Specifically for high viscosity polyurethane elastomer pouring forming, provide a simple device that vacuum stirring and vacuum pouring are shared, i.e. vacuum stirring and vacuum pouring can be realized simultaneously in a set of equipment, easy to operate, and reduce equipment investment cost, without purchasing high and low pressure pouring machine of expensive price, also facilitate process operation.

[0007] The utility model can realize simple device that vacuum stirring and vacuum pouring are shared and full-process visualization, easy to operate, low in cost, and strong in practicality.

[0008] The vacuum stirring pouring integrated device includes a box body, and an upper cover movably connected with the box body;When the upper cover is closed to the upper side of the box body, a sealed space can be formed;The box body is provided with a stirring device and a pouring device;

[0009] Among them, stirring hole, air extraction hole, pouring hole are respectively arranged on the upper cover;The stirring hole is connected with the stirring structure of the stirring device;The air extraction hole is connected with an external air pump;The pouring hole is connected with the pouring device through a pipeline.

[0010] Among them, the stirring device and the pouring device are conventional vacuum devices for polyurethane stirring and pouring.

[0011] Among them, the box body and the upper cover are made of acrylic plate.

[0012] It further includes a support table for mounting and fixing the box body.

[0013] The simple device uses acrylic transparent plate, and the pouring and leveling conditions of glue solution can be directly observed in all directions by naked eye, to provide the most direct basis for process adjustment.

[0014] Among them, the box body is sealed and installed by screws, sealing rubber strips and sealing putty.

[0015] Among them, the box body and the upper cover are fixedly connected through hinge.

[0016] Among them, the air pump is an air compressor or a vacuum pump.

[0017] Among them, the pipeline is a silica gel tube.

[0018] Among them, the pouring device is provided with a tooling mold, and the pipeline of the pouring hole is connected with the tooling mold.

[0019] Specifically, the present invention provides a simple device for both vacuum mixing and vacuum pouring, comprising a support platform, an acrylic box mounted on the support platform, and a sealed enclosure using screws, sealing strips, and sealing putty. A removable acrylic cover is located on the top of the box, with holes for mixing, exhaust, and pouring. The cover and the box are hinged to allow for opening and closing. The box is constructed entirely of transparent acrylic, allowing for full observation of the workings within the box.

[0020] The utility model provides a common device for vacuum stirring and vacuum pouring of liquid polyurethane rubber, and the overall structure can withstand an internal negative pressure of -0.1MPa. The stirrer inside the box can be connected to an external power supply through a stirring hole, thereby realizing a stirring function. The pressure in the cylinder can be controlled by a vacuum pump or a compressor, so that the two components of the polyurethane can be mixed and stirred under negative pressure conditions, and the mixed liquid polyurethane glue can be sucked into the mold cavity of the vacuum device until the cavity is finally filled. The fluid state of the polyurethane during the stirring and pouring process can be clearly seen, and the vacuum environment can significantly eliminate and suppress bubbles in the polyurethane rubber, thereby improving the apparent quality and various properties of the polyurethane elastomer after curing.

[0021] The utility model designs vacuum stirring and vacuum pouring together in a transparent device, which can reduce the total cost of separately supporting two vacuum equipments. The entire device is 360 degrees visual, which can well observe the stirring and flow of the resin. The process parameters can be adjusted according to the actual process conditions to obtain high-quality polyurethane casting products.

[0022] The utility model has at least the following beneficial effects:

[0023] 1) Vacuum mixing and vacuum pouring can be achieved in the same device, eliminating the trouble of equipping two sets of equipment separately.

[0024] 2) No expensive vacuum stirring and degassing equipment is required, the total cost is low, and it is suitable for small laboratories or research, development and production of small-sized products.

[0025] 3) The mixing and pouring process of the glue can be observed transparently and intuitively throughout the process, avoiding the uncertainty in the closed vacuum operation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of the vacuum stirring and pouring integrated device provided by the utility model;

[0027] In the figure: 1. Stirring hole; 2. Exhaust hole; 3. Pouring hole; 4. Upper cover; 5. Agitator; 6. Tooling mold; 7. Box body. DETAILED DESCRIPTION

[0028] The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0029] Embodiment 1

[0030] The utility model discloses a kind of polyurethane pouring structure, the polyurethane pouring structure has the characteristics of pouring fast, simultaneously can avoid the contact between polyurethane glue liquid and air. Below will be combined with the drawing in the utility model, the technical scheme in the utility model is clearly and completely described, obviously, only part of the embodiment of the utility model is described, not all embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the scope of the utility model protection.

[0031] The embodiment provides a vacuum stirring pouring integrated device for pouring high-viscosity polyurethane forming,

[0032] As Figure 1 Shown, including the box 7 of acrylic material, box can be fixedly installed on common support table or experiment table, box is sealed installation through screw, sealing rubber strip and sealing putty around, and the upper end of box is provided with an open upper cover 4 of acrylic material, and the upper cover 4 is fixedly connected with the box through hinged connection and can be detached.The box 7 is provided with stirring device and pouring device in it;

[0033] The upper cover 4 is provided with stirring hole 1, air extraction hole 2 and pouring hole 3 respectively.

[0034] The stirring hole 1 is connected with the stirring structure of the stirring device, and is specifically connected with a stirrer 5, which is a conventional electric stirrer; since it is a conventional stirrer, the schematic diagram is simplified) to stir and mix polyurethane prepolymer and chain extender;The air extraction hole 2 is connected with an external air pump, which controls the air to be discharged from the box 7;It is connected with an air compressor or a vacuum pump to provide negative pressure for the box 7;The pouring hole 3 is connected with the pouring device through a pipeline to control the liquid polyurethane mixture to enter the tooling mold 6 in the box 7.

[0035] The working process of the utility model is as follows:

[0036] (1) according to the proportion, the polyurethane two-component glue material weighed is loaded into the stirring cup, and is placed below the stirring hole 1 in the box 7;Close the upper cover 4, use vacuum pump to extract air in the box 7 through air extraction hole 2, pressure extraction to-0.1MPa, start external power supply, start vacuum stirring process;

[0037] (2) After the vacuum stirring is completed, the mixed polyurethane glue solution is taken out, connected to the pouring hole 3 through a silica gel pipe, and the lower end of the pouring hole 3 is also connected to the tooling mold in the box body 7 through a silica gel pipe. Similarly, the box body 7 is pumped to -0.1 MPa by using a vacuum pump, the mixed liquid glue is sucked into the mold cavity in the box body, and when the liquid fills the cavity, the pouring process can be stopped. Finally, the pressure is released and the exhaust is opened, the poured sample is taken out, put into a high-temperature oven for predetermined high-temperature curing and post-curing, and finally the polyurethane elastomer with excellent apparent quality and excellent performance is obtained. (That is, when stirring, vacuum is extracted, then after stirring is completed, the box body is opened, returned to normal pressure, and the liquid polyurethane is taken out; vacuum is extracted again, and the polyurethane glue solution is injected into the pouring device in the box body.)

[0038] Although the utility model has been described in detail above with general description, specific embodiments and tests, some modifications or improvements can be made on the basis of the utility model, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the utility model belong to the scope of protection required by the utility model.

Claims

1. A vacuum stirring and pouring integrated device for pouring high viscosity polyurethane, characterized in that: The invention comprises a box body (7) and an upper cover (4) movably connected to the box body (7); when the upper cover (4) is closed above the box body (7), a sealed space can be formed; a stirring device and a pouring device are provided in the box body (7); The upper cover (4) is provided with a stirring hole (1), an air extraction hole (2), and a pouring hole (3), respectively; the stirring hole (1) is connected to the stirring structure of the stirring device; the air extraction hole (2) is connected to an external air pump; and the pouring hole (3) is connected to the pouring device via a pipeline.

2. The vacuum stirring and pouring integrated device according to claim 1, characterized in that: The plate materials of the box body (7) and the upper cover (4) are acrylic plates.

3. The vacuum stirring and pouring integrated device according to claim 1, characterized in that: The four sides of the box body (7) are sealed and installed by screws, sealing strips and sealing putty.

4. The vacuum stirring and pouring integrated device according to claim 1, characterized in that: The box body (7) and the upper cover (4) are fixedly connected via a hinge.

5. The vacuum stirring and pouring integrated device according to claim 1, characterized in that: The air pump is an air compressor or a vacuum pump.

6. The vacuum stirring and pouring integrated device according to claim 1, characterized in that: The pipeline is a silicone tube.

7. The vacuum stirring and pouring integrated device according to claim 1 or 6, characterized in that: The pouring device is provided with a tooling die (6), and the pipeline of the pouring hole (3) is connected to the tooling die (6).

8. The vacuum stirring and pouring integrated device according to any one of claims 1 to 6, characterized in that: It also includes a support platform for installing and fixing the box body (7).

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