A foaming device for pre-foamed particles

Abstract

The utility model discloses a foaming device for pre-foamed particles, the foaming device comprises a hot water pool, the hot water pool is filled with hot water, the hot water pool is provided with a delivery device for delivering or taking out the pre-foamed particles and a heating device for heating the hot water pool. The utility model delivers the pre-foamed particles into hot water within a certain period of time for foaming, prevents the high-pressure gas filled in from escaping, and during the foaming process, controls the foaming time while maintaining the temperature and pressure conditions of the hot water, and completely wraps the pre-foamed particles with hot water, so that the pre-foamed particles are heated more evenly, thereby ensuring the uniformity and stability of the foaming, and improving the production efficiency and product quality.

Description

Technical Field

[0001] The utility model relates to the technical field of foaming, in particular to a foaming device for pre-foamed particles. Background Art

[0002] Thermoplastic polyurethane (TPU) materials are widely used in many industries due to their advantages such as high wear resistance, high elasticity, and chemical resistance. TPU foam materials are light in weight and good in elasticity, and are widely used in the fields of shoe materials, automotive interiors, etc. The traditional foaming method uses chemical foaming, and other substances are added inside the particles as foaming agents. However, harmful gases are usually generated during the foaming process, which is not conducive to environmental protection. The use of physical foaming to foam TPU micropores is a new process. Compared with traditional chemical foaming, it does not contain other additives and does not pollute the environment. How to control the micropore foaming inside the TPU particle material is a key technical problem that needs to be solved urgently. The existing method uses the raw material TPU particles to be put into a high-pressure reactor, and the reactor is filled with a mixed gas of carbon dioxide and nitrogen, and the pressure and temperature in the reactor are gradually increased. The pressure is maintained for penetration for a period of time, and then the pressure is quickly released, and the high-pressure gas is filled into the TPU particles. Then, the pre-foamed particles are heated by steam to make them foam and expand. After meeting certain requirements, they are taken out and then other steps are processed according to the requirements of later processing. Existing pre-foaming is mostly done by heating water in a container. After the water vapor passes through a dense screen and contacts the pre-foamed particles on the screen, the pre-foamed particles are manually stirred with a tool. This pre-foaming method produces pre-foamed beads of uneven size, difficult to control, and easy to burn. It is time-consuming and labor-intensive, and has a low yield, which cannot meet the requirements of experiments and production. Utility Model Content

[0003] The purpose of the utility model is to provide a foaming method for pre-foamed particles to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a foaming device for pre-foamed particles, the foaming device comprising a hot water pool, the hot water pool containing hot water, the hot water pool being provided with a throwing device for throwing in or taking out the pre-foamed particles and a heating device for heating the hot water pool.

[0005] Furthermore, the delivery device includes a net bag and a bag-lifting mechanism for immersing the net bag in hot water or taking it out of hot water.

[0006] Furthermore, the bag lifting mechanism includes a lifting mechanism, and one end of the lifting mechanism is connected to a clamping mechanism for clamping the net bag.

[0007] Furthermore, the clamping mechanism includes a clamping hook, and the clamping hook hooks the mesh bag.

[0008] Furthermore, the clamping mechanism includes a placement plate, the placement plate is a hollow structure, a clip is provided on the placement plate, the mesh bag is laid flat on the placement plate, and the clip fixes the mesh bag on the placement plate.

[0009] Furthermore, the hot water pool is provided with a flip-up upper cover.

[0010] Furthermore, a pressing plate is arranged on the mesh bag, and a foaming distance for the pre-foamed particles to foam is provided between the placement plate and the pressing plate.

[0011] Furthermore, the heating device includes one or more of an electric heating rod, a heating coil, a heating plate,

[0012] Compared with the prior art, the utility model has the following beneficial effects: the utility model puts the pre-foamed particles into hot water for foaming within a certain period of time to prevent the high-pressure gas filled in from escaping; during the foaming process, the temperature and pressure conditions of the hot water are maintained while the foaming time is controlled; the hot water completely wraps the pre-foamed particles, making the pre-foamed particles heated more evenly, thereby ensuring the uniformity and stability of the foaming and improving production efficiency and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural diagram of a foaming device for pre-foamed particles in Example 1 of the utility model;

[0014] Figure 2 This is an assembly structure diagram of a foaming device for pre-foamed particles in Example 2 of the utility model;

[0015] Figure 3 This is a structural diagram of a foaming device for pre-foamed particles in Example 2 of the utility model;

[0016] In the figure, 1-hot water pool, 11-upper cover, 21-net bag, 221-lifting mechanism, 222-clamping hook, 223-placing plate, 224-clip. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] The present embodiment provides a foaming device for pre-foamed particles, which uses a reactor or a mold to fill high-pressure gas into the particles to be foamed to form pre-foamed particles. For example, the reactor in the background technology of the present application can be used as a pre-foaming device, and the high-pressure gas is filled into the particles to be foamed to form pre-foamed particles. The application number of the applicant is CN2023233322284, and the patent name is a foaming particle inflation device as a pre-foaming device, and the high-pressure gas is filled into the particles to be foamed to form pre-foamed particles; the foaming device includes a hot water pool 1 The hot water pool 1 is filled with hot water, and the hot water pool 1 is provided with a delivery device for delivering or taking out the pre-foamed particles and a heating device for heating the hot water pool 1. The heating device may be an electric heating rod, a heating coil, a heating sheet, etc., to heat the water in the hot water pool 1. A temperature sensor may also be provided to sense the temperature of the hot water pool 1, and the hot water is kept at a constant temperature by the heating device 3, or the hot water is kept in a boiling state by the heating device. The delivery device includes a net bag 21 and a bag lifting mechanism for immersing the net bag 21 in the hot water or taking it out of the hot water;

[0019] Embodiment 1:

[0020] like Figure 1As shown, the opening of the mesh bag 21 is provided with an elastic band, and the opening is opened or closed by the elastic band. The bag lifting mechanism includes a lifting mechanism 221. One end of the lifting mechanism 221 can be fixed on the ceiling or fixed on a support frame set on the ceiling or the floor, as long as the cylinder can be fixed. One end is connected to a clamping mechanism for clamping the mesh bag 21. The lifting mechanism 221 includes but is not limited to a cylinder, a motor, an oil cylinder, etc. In this embodiment, the lifting mechanism adopts a lifting cylinder, and the clamping mechanism is a clamping hook 222. The pre-foamed particles are loaded into the mesh bag 21 manually or by a robot, and the elastic band 211 is tightened to close the opening, and the mesh bag 21 is Hanging on the clamping hook 222, the lifting cylinder extends out, driving the clamping hook 222 to move downward, and then driving the net bag 21 to move downward and submerge in the hot water. For example, the pre-foamed particles are put into the hot water within 2 to 30 seconds to prevent the high-pressure gas filled in from escaping. The weight ratio of the pre-foamed particles to the hot water is at least 1:20, and can be 1:50 to 70, so that the particles can be evenly dispersed in the hot water and completely immersed in the hot water, and fully contacted with the hot water, thereby ensuring the uniformity and stability of the foaming process. The pre-foamed particles are completely immersed in the hot water, and the hot water completely wraps the pre-foamed particles. The pre-foamed particles are fully immersed in the hot water and fully contacted with the hot water. The pre-foamed particles are fully and evenly contacted with each other. During the foaming process, the temperature of the hot water is maintained above 70°C and the water temperature is kept constant. For example, the hot water can be kept in a boiling state, which can ensure that the pre-foamed particles are fully and evenly heated in the hot water, so that the high-pressure gas in the pre-foamed particles expands rapidly to achieve an ideal foaming effect. The particles are taken out after foaming for 15 to 40 seconds, wherein the foaming time is proportional to the charging pressure of the high-pressure gas, and the expansion speed of the pre-foamed particles can be effectively controlled, thereby ensuring the stability and consistency of the foaming process. For example, at a pressure of 9 to 12 MPa, the foaming time is 15 seconds, and at a pressure of 12 to 15 MPa, the pre-foamed particles are heated to a temperature of 100 °C and a temperature of 200 °C. Under the pressure of 20-25MPa, the foaming time is 25s, and under the pressure of 20-25MPa, the foaming time is 40s, ensuring that the pre-foamed particles can achieve the ideal foaming effect under different conditions, improving the stability and efficiency of production for foaming. After the foaming is completed, the lifting cylinder retracts, driving the clamping mechanism 222 to move upward, and then driving the net bag 21 to move upward and leave the hot water pool 21. The net bag 21 is manually or by a manipulator sent to the pressure holding tank for pressure holding. In this process, a timer can be set on site to issue a reminder when the foaming time is reached, and the lifting cylinder is manually operated or linked with the lifting cylinder to drive the lifting cylinder to fish out the net bag 21.

[0021] Embodiment 2:

[0022] like Figure 2 and Figure 3As shown, the opening of the mesh bag 21 is provided with a zipper, the clamping mechanism includes a placement plate 223, the placement plate 223 is a hollow structure, a clip 224 is provided on the placement plate 223, the mesh bag 21 is laid flat on the placement plate 223, and the clip 224 fixes the mesh bag 21 on the placement plate 223. For example, the placement plate 223 is a square structure, the mesh bag 21 is laid flat on the surface of the placement plate 223, and the clip 224 clamps the four corners of the mesh bag 21. 1 is relatively large, and a clip 224 can be added to clamp the net bag 21. The hot water pool 1 is provided with a reversible upper cover 11, which is divided into two parts and is symmetrically arranged on the left and right. The upper cover 11 is connected with a spring. When the heating device 3 is heated, the upper cover 11 is closed to reduce heat loss. The pre-foamed particles are manually or mechanically loaded into the net bag 21, the zipper is closed, the opening is closed, and the net bag 21 is laid flat on the surface of the placement board 223. The clips 224 clamp the four corners of the net bag 21, and then the net bag 21 is filled with the pre-foamed particles. The pre-foamed particles are laid flat to prevent the pre-foamed particles from piling up. The lifting cylinder extends out to drive the placement plate 223 to move downward. When the placement plate 223 moves downward to the upper cover 11, due to the action of the spring, the upper cover 11 is folded to both sides on the inner wall of the hot water pool 1, thereby driving the net bag 21 to move downward and immerse in the hot water for foaming. After the foaming is completed, the lifting cylinder retracts, driving the placement plate 223 to move upward, thereby driving the net bag 21 to move upward and leave the hot water pool 21. Under the action of the spring, the upper cover 11 covers the hot water pool 1, and the net bag 21 is manually or by a manipulator sent to the pressure-maintaining tank for pressure maintenance. In this process, a timer can be set on site to issue a reminder when the foaming time is reached. The lifting cylinder is manually operated, or linked with the lifting cylinder to drive the lifting cylinder to fish out the net bag 21. A pressing plate can also be set on the net bag 21, and there is a certain distance between the placement plate 223 and the pressing plate, which can be used for foaming of the pre-foamed particles, thus preventing the foamed particles from piling up.

[0023] The utility model puts pre-foamed particles into hot water for foaming within a certain period of time, thereby preventing the high-pressure gas filled in from escaping. During the foaming process, the temperature and pressure conditions of the hot water are maintained while the foaming time is controlled. The hot water completely wraps the pre-foamed particles, so that the pre-foamed particles are heated more evenly, thereby ensuring the uniformity and stability of the foaming, and improving the production efficiency and product quality.

[0024] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A foaming device for pre-foamed particles, characterized in that: High-pressure gas is filled into the particles to be foamed to form pre-foamed particles. The foaming equipment includes a hot water pool filled with hot water. The hot water pool is provided with a feeding device for feeding or taking out the pre-foamed particles and a heating device for heating the hot water pool.

2. The foaming device for pre-foamed particles according to claim 1, characterized in that: The placing device comprises a net bag and a bag-lifting mechanism for immersing the net bag in hot water or taking the net bag out of hot water.

3. The foaming device for pre-foamed particles according to claim 2, characterized in that: The bag lifting mechanism comprises a lifting mechanism, one end of which is connected with a clamping mechanism for clamping the net bag.

4. The foaming device for pre-foamed particles according to claim 3, characterized in that: The clamping mechanism comprises a clamping hook, and the clamping hook hooks the net bag.

5. The foaming device for pre-foamed particles according to claim 3, characterized in that: The clamping mechanism comprises a placing plate, the placing plate is a hollow structure, a clip is arranged on the placing plate, the mesh bag is laid flat on the placing plate, and the clip fixes the mesh bag on the placing plate.

6. The foaming device for pre-foamed particles according to claim 5, characterized in that: The hot water pool is provided with a reversible upper cover.

7. The foaming device for pre-foamed particles according to claim 5 or 6, characterized in that: A pressing plate is arranged on the mesh bag, and a foaming distance for the pre-foamed particles to foam is provided between the placement plate and the pressing plate.

8. The foaming device for pre-foamed particles according to claim 1, characterized in that: The heating device includes one or more of an electric heating rod, a heating coil, and a heating plate.

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