Polypropylene foam particle mixing and extrusion equipment and use method

Abstract

The present invention relates to the field of plastic processing technology, and in particular to a polypropylene foam particle mixing and extrusion equipment, comprising: a base plate; a mixing and insulation box, the mixing and insulation box is arranged on the upper side of the base plate, the lower side of the mixing and insulation box is provided with an automatic melting and feeding device, and one side of the mixing and insulation box is provided with an automatic mixing device; a plurality of connecting legs, one end of the connecting legs is fixed on the outer side of the mixing and insulation box, and the other end of the connecting legs is fixed on the upper side of the base plate; a fixed cover, the fixed cover is fixed on the opening side of the mixing and insulation box; a push plate, the push plate can slide on the inner side of the mixing and insulation box. The present invention, by arranging a mixing and insulation box, connecting legs, a fixed cover, a push plate, an electric control valve, an extrusion nozzle, a feed pipe, an electric heating ring, a support plate, a feed shaft, a feed motor, an L-shaped frame, and spiral blades, has the functions of automatic melting, automatic extrusion, rapid mixing, uniform mixing, precise extrusion, and quantitative extrusion.

Description

Technical Field

[0001] The invention relates to the technical field of plastic processing, and in particular to a polypropylene foam particle mixing and extruding device and a use method thereof. Background Art

[0002] Plastic processing is also called plastic molding processing. It is a general term for various processes that convert synthetic resins or plastics into plastic products. It is a large production sector in the plastics industry. Plastic processing generally includes plastic batching, molding, machining, joining, modification and assembly.

[0003] EPP is the abbreviation of expanded polypropylene, which is the abbreviation of a new type of foam plastic. EPP is a polypropylene plastic foam material, a highly crystalline polymer / gas composite material with excellent performance. With its unique and superior performance, it has become the fastest growing new environmentally friendly pressure-resistant buffer insulation material. EPP is also an environmentally friendly material that can be recycled.

[0004] Plastic additives, also known as plastic additives, are some compounds that must be added to polymers (synthetic resins) during molding to improve their processing properties or to improve the insufficient properties of the resin itself. For example, plasticizers are added to reduce the molding temperature of polyvinyl chloride resins and make the products soft; foaming agents are added to prepare lightweight, vibration-resistant, heat-insulating, and sound-insulating foam plastics; the thermal decomposition temperature of some plastics is very close to the molding temperature, and they cannot be molded without the addition of heat stabilizers. Therefore, plastic additives occupy a particularly important position in plastic molding. A large category of additives used for plastic molding products includes plasticizers, heat stabilizers, antioxidants, light stabilizers, flame retardants, foaming agents, antistatic agents, mildew inhibitors, colorants and whitening agents (see pigments), fillers, coupling agents, lubricants, release agents, etc.

[0005] At present, when making plastic parts with foamed polypropylene as raw material, it is necessary to use an extruder to melt the raw material, and then extrude the melted raw material into a mold. When melting the raw material, plastic additives need to be added.

[0006] The extruder in the prior art has no uniform mixing function. When melting the raw materials, it is impossible to fully and evenly mix the molten raw materials with the plastic additives, which easily leads to uneven distribution of the plastic additives. In addition, there is no precise quantitative extrusion function, and the extrusion amount cannot be accurately controlled. Over-extrusion or under-extrusion may occur, which will affect the quality of plastic parts. For this reason, we propose a polypropylene foam particle mixing and extrusion equipment to solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to solve the shortcomings that the extruder in the prior art has no uniform mixing function, when melting the raw materials, the molten raw materials and the plastic additives cannot be fully and evenly mixed, and the plastic additives are easily unevenly distributed, and there is no precise quantitative extrusion function, and the extrusion amount cannot be accurately controlled, and over-extrusion or under-extrusion may occur, thereby affecting the quality of plastic parts. A polypropylene foam particle mixing and extrusion equipment and a use method are proposed.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] Design a polypropylene foam particle mixing and extrusion equipment, including:

[0010] Base plate;

[0011] A mixing and heat-insulating box, wherein the mixing and heat-insulating box is arranged on the upper side of the bottom plate, an automatic melting and feeding device is arranged on the lower side of the mixing and heat-insulating box, and an automatic mixing device is arranged on one side of the mixing and heat-insulating box;

[0012] A plurality of connecting legs, one end of each of the connecting legs is fixed on one side outside the mixing and heat preservation box, and the other end of each of the connecting legs is fixed on the upper side of the bottom plate;

[0013] A fixed cover, the fixed cover is fixed to one side of the opening of the mixing and heat preservation box;

[0014] A push plate, which can slide inside the mixing and heat preservation box, and one side of the push plate is provided with an automatic moving device;

[0015] An electrically controlled valve, the electrically controlled valve is fixedly connected to a side of the mixing and heat preservation box away from the fixed cover through a pipeline, and the electrically controlled valve needs to be connected to an external power supply and a switch through a wire;

[0016] An extrusion nozzle is fixedly connected to the other side of the electric control valve.

[0017] Preferably, the automatic melting feeding device includes a feeding pipe, a feeding hole is provided on the lower side of the mixing and insulation box, the feeding pipe is fixed on the inner side of the feeding hole, an electric heating ring is fixed on the outer side of the feeding pipe, a support plate is fixed on one end of the feeding pipe, an axial hole is provided on one side of the support plate, a feeding shaft is rotatably provided on the inner side of the axial hole, a feeding motor is fixed on one end of the feeding shaft, a plurality of L-shaped frames are fixed on the outer side of the feeding motor, the L-shaped frames are all fixed on one side of the support plate, a spiral blade is fixed on the outer side of the feeding shaft, the spiral blade is arranged on the inner side of the feeding pipe, a plurality of mounting holes are provided on the outer side of the feeding pipe, a feeding hopper is fixed on the inner side of the mounting hole, a support rod is fixed on one side of the feeding hopper, one end of the support rod is fixed on the upper side of the bottom plate, and the feeding motor and the electric heating ring need to be connected to an external power supply and a switch through wires.

[0018] Preferably, the automatic mixing device includes a connecting rod, an automatic reciprocating motion device is provided between the connecting rod and the bottom plate, a plurality of sliding rods are fixedly provided on one side of the connecting rod, a mixing rack is fixedly provided on the other end of the sliding rod, a plurality of accommodating grooves are provided on one side of the mixing and insulation box, the mixing racks are detachably arranged on the inner side of the accommodating grooves, a through hole is provided on one side of the accommodating grooves, a sealing ring is fixedly provided on the inner side of the through hole, the sliding rods are slidable on the inner side of the sealing ring, a plurality of guide holes are provided on one side of the connecting rod, a guide rod is slidably provided on the inner side of the guide hole, and one end of the guide rod is fixed on the outer side of the mixing and insulation box.

[0019] Preferably, the automatic reciprocating motion device includes a U-shaped support frame, which is fixed on the upper side of the base plate, a mixing motor is fixedly provided on one side of the U-shaped support frame, a rotating disk is fixedly provided on the shaft end of the mixing motor, a connecting rod is rotatably provided on one side of the rotating disk, and the other end of the connecting rod is rotatably connected to one side of the connecting rod, and the mixing motor needs to be connected to an external power supply and a switch through wires.

[0020] Preferably, a sealing sleeve is fixedly provided on the outer side of the push plate, and the sealing sleeve can slide on the inner side of the mixing and heat preservation box.

[0021] Preferably, the automatic moving device includes an L-shaped driving frame, one end of the L-shaped driving frame is fixed on one side of the pushing plate, and one side of the fixed cover is provided with a through hole, the L-shaped driving frame can slide on the inner side of the through hole, and one side of the L-shaped driving frame is fixed with a driving block, and the driving block can slide on the upper side of the bottom plate, and one side of the driving block is provided with a threaded hole, and the inner side of the threaded hole is provided with a threaded rod through a threaded connection, and the outer side of the threaded rod is rotatably provided with a plurality of connecting seats, and one end of the threaded rod is fixed with a stepper motor, and the connecting seat and the stepper motor are both fixed on the upper side of the bottom plate, and the stepper motor needs to be externally connected to a drive controller and a power supply through wires.

[0022] Preferably, a plurality of insulation sheets are fixedly provided on the outer side of the mixing and insulation box.

[0023] A polypropylene foam particle mixing and extrusion device, and a method of using the device comprises the following steps:

[0024] S100, putting raw materials and plastic additives into a feed hopper.

[0025] S200, turn on the electric heating ring and keep it on for a certain period of time.

[0026] S300, turn on the feeding motor and mixing motor, and control the electronic control valve to open at the same time, and then automatic mixing and extrusion can be carried out.

[0027] S400, when it is necessary to completely extrude the raw materials in the mixing and heat preservation box or extrude a certain amount of raw materials, the feeding motor and the mixing motor are controlled to stop, and the mixing racks are placed in the receiving groove, and then the stepper motor is turned on to make the push plate automatically approach the extrusion nozzle. When the raw materials in the mixing and heat preservation box are completely extruded, the push plate is reset by the stepper motor.

[0028] The invention proposes a polypropylene foam particle mixing and extrusion equipment, which has the beneficial effects of: by setting a bottom plate, a mixing and heat-insulating box, a connecting leg, a fixed cover, an electric control valve, an extrusion nozzle, a feed pipe, an electric heating ring, a support plate, a feed shaft, a feed motor, an L-shaped frame, a spiral blade, a feed hopper, and a support rod, it has the functions of automatic melting and automatic extrusion, can automatically melt raw materials and plastic additives, and can squeeze liquid raw materials and plastic additives into the mixing and heat-insulating box. By setting a mixing and heat-insulating box, a connecting rod, a sliding rod, a mixing frame, a sealing ring, a guide rod, a U-shaped support frame, a mixing motor, a rotating disk, and a connecting rod, it has a uniform mixing function, can fully and evenly mix the plastic additives with the raw materials, and thus can prevent the uneven distribution of the plastic additives, and thus can improve the quality of plastic parts. By arranging a push plate, a sealing sleeve, an L-shaped driving frame, a driving block, a threaded rod, a connecting seat and a stepping motor, the machine has a precise extrusion function and can precisely control the extrusion amount, thereby preventing over-extrusion or under-extrusion, thereby ensuring the quality of plastic parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the front three-dimensional structure of a polypropylene foam particle mixing and extrusion device proposed by the present invention;

[0030] Figure 2 This is a schematic diagram of the back three-dimensional structure of a polypropylene foam particle mixing and extrusion device proposed by the present invention;

[0031] Figure 3 This is a front cutaway three-dimensional structural schematic diagram of a polypropylene foam particle mixing and extrusion device proposed by the present invention;

[0032] Figure 4 A schematic diagram of a side-sectioned three-dimensional structure of a polypropylene foam particle mixing and extrusion device proposed by the present invention;

[0033] Figure 5 The present invention provides a schematic diagram of a partially cutaway three-dimensional structure of a polypropylene foam particle mixing and extrusion device proposed by the present invention.

[0034] In the figure: 1 bottom plate, 2 mixing and insulation box, 3 connecting legs, 4 fixed cover, 5 push plate, 6 electric control valve, 7 extrusion nozzle, 8 feed pipe, 9 electric heating ring, 10 support plate, 11 feed shaft, 12 feed motor, 13 L-type frame, 14 spiral blade, 15 feed hopper, 16 support rod, 17 connecting rod, 18 sliding rod, 19 mixing frame, 20 sealing ring, 21 guide rod, 22 U-type support frame, 23 mixing motor, 24 rotating disk, 25 connecting rod, 26 sealing sleeve, 27 L-type driving frame, 28 driving block, 29 threaded rod, 30 connecting seat, 31 stepping motor, 32 insulation sheet. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] Reference Figure 1-5 , a polypropylene foam particle mixing and extrusion device, comprising:

[0037] Bottom plate 1;

[0038] A mixing and heat preservation box 2 is arranged on the upper side of the bottom plate 1, an automatic melting and feeding device is arranged on the lower side of the mixing and heat preservation box 2, and an automatic mixing device is arranged on one side of the mixing and heat preservation box 2;

[0039] A plurality of connecting legs 3, one end of each of the connecting legs 3 is fixed on one side outside the mixing and heat preservation box 2, and the other end of each of the connecting legs 3 is fixed on the upper side of the bottom plate 1;

[0040] A fixed cover 4, which is fixed to one side of the opening of the mixing and heat preservation box 2;

[0041] A push plate 5, which can slide inside the mixing and heat preservation box 2, and one side of the push plate 5 is provided with an automatic moving device;

[0042] The electric control valve 6 is fixedly connected with the mixing and heat preservation box 2 at a side away from the fixed cover 4 through a pipeline, and the electric control valve 6 needs to be connected to an external power supply and a switch through a wire;

[0043] The extrusion nozzle 7 is fixedly connected to the other side of the electric control valve 6 .

[0044] The automatic melting feeding device includes a feeding pipe 8, a feeding hole is provided on the lower side of the mixing and insulation box 2, the feeding pipe 8 is fixed on the inner side of the feeding hole, an electric heating ring 9 is fixed on the outer side of the feeding pipe 8, a support plate 10 is fixed on one end of the feeding pipe 8, an axial hole is provided on one side of the support plate 10, a feeding shaft 11 is rotatably provided on the inner side of the axial hole, a feeding motor 12 is fixed on one end of the feeding shaft 11, a plurality of L-shaped frames 13 are fixed on the outer side of the feeding motor 12, and the L-shaped frames 13 are all fixed on one side of the support plate 10, a spiral blade 14 is fixed on the outer side of the feeding pipe 8, a plurality of mounting holes are provided on the outer side of the feeding pipe 8, a feeding hopper 15 is fixed on the inner side of the mounting hole, a support rod 16 is fixed on one side of the feeding hopper 15, one end of the support rod 16 is fixed on the upper side of the bottom plate 1, and the feeding motor 12 and the electric heating ring 9 need to be connected to an external power supply and a switch through wires.

[0045] The automatic mixing device includes a connecting rod 17, and an automatic reciprocating motion device is provided between the connecting rod 17 and the bottom plate 1. A plurality of sliding rods 18 are fixedly provided on one side of the connecting rod 17, and a mixing rack 19 is fixedly provided on the other end of the sliding rod 18. A plurality of receiving grooves are provided on one side of the mixing and insulation box 2, and the mixing racks 19 are all removable and arranged on the inner side of the receiving grooves. A through hole is provided on one side of the receiving grooves, and a sealing ring 20 is fixedly provided on the inner side of the through hole. The sliding rods 18 can slide on the inner side of the sealing ring 20. A plurality of guide holes are provided on one side of the connecting rod 17, and a guide rod 21 is slidably provided on the inner side of the guide hole, and one end of the guide rod 21 is fixed on the outer side of the mixing and insulation box 2.

[0046] The automatic reciprocating motion device includes a U-shaped support frame 22, which is fixed on the upper side of the base plate 1. A mixing motor 23 is fixedly arranged on one side of the U-shaped support frame 22. A rotating disk 24 is fixedly arranged on the shaft end of the mixing motor 23. A connecting rod 25 is rotatably arranged on one side of the rotating disk 24. The other end of the connecting rod 25 is rotatably connected to one side of the connecting rod 17. The mixing motor 23 needs to be connected to an external power supply and a switch through wires.

[0047] A sealing sleeve 26 is fixedly provided on the outer side of the push plate 5 , and the sealing sleeve 26 can slide on the inner side of the mixing and heat preservation box 2 .

[0048] The automatic moving device includes an L-shaped driving frame 27, one end of which is fixed on one side of the push plate 5, and a through hole is provided on one side of the fixed cover 4. The L-shaped driving frame 27 can slide on the inner side of the through hole, and a driving block 28 is fixed on one side of the L-shaped driving frame 27. The driving block 28 can slide on the upper side of the base plate 1, and a threaded hole is provided on one side of the driving block 28. A threaded rod 29 is provided on the inner side of the threaded hole through a threaded connection, and a plurality of connecting seats 30 are rotatably provided on the outer side of the threaded rod 29. A stepping motor 31 is fixed on one end of the threaded rod 29. The connecting seat 30 and the stepping motor 31 are both fixed on the upper side of the base plate 1, and the stepping motor 31 needs to be connected to an external drive controller and a power supply through wires.

[0049] A plurality of heat-insulating sheets 32 are fixedly provided on the outer side of the mixing and heat-insulating box 2 .

[0050] A polypropylene foam particle mixing and extrusion device, and a method of using the device comprises the following steps:

[0051] S100, putting raw materials and plastic additives into the feed hopper 15.

[0052] S200, turn on the electric heating ring 9 and keep it on for a certain period of time.

[0053] S300, start the feeding motor 12 and the mixing motor 23, and control the electronically controlled valve 6 to open, so that automatic mixing and extrusion can be performed.

[0054] S400. When it is necessary to completely squeeze out the raw materials in the mixing and heat-insulating box 2 or squeeze out a certain amount of raw materials, the feeding motor 12 and the mixing motor 23 are controlled to stop, and the mixing rack 19 is placed in the receiving groove. Then the stepper motor 31 is turned on to make the push plate 5 automatically approach the extrusion nozzle 7. When the raw materials in the mixing and heat-insulating box 2 are completely squeezed out, the push plate 5 is reset by the stepper motor 31.

[0055] The present invention, when used:

[0056] By arranging the bottom plate 1, the mixing and insulation box 2, the connecting legs 3, the fixing cover 4, the electric control valve 6, the extrusion nozzle 7, the feeding pipe 8, the electric heating ring 9, the supporting plate 10, the feeding shaft 11, the feeding motor 12, the L-shaped frame 13, the spiral blades 14, the feeding hopper 15 and the supporting rod 16, the mixing and insulation box 2 has the functions of automatic melting and automatic extrusion, and can automatically melt the raw materials and plastic additives, and can squeeze the liquid raw materials and plastic additives into the mixing and insulation box 2. In specific implementation, when in use, the raw materials and plastic additives can be put into the feeding hopper 15, and then the electric heating ring 9 is turned on for a certain period of time to heat the feeding pipe 8, and then the feeding motor 12 is turned on. At this time, the raw materials and plastic additives in the feeding hopper 15 will be automatically melted, and the liquid raw materials and plastic additives will automatically enter the mixing and insulation box 2. When the raw materials in the mixing and insulation box 2 reach the full state, the internal raw materials can be squeezed out through the electric control valve 6 and the extrusion nozzle 7, thereby realizing automatic extrusion.

[0057] By arranging the mixing and insulation box 2, the connecting rod 17, the sliding rod 18, the mixing frame 19, the sealing ring 20, the guide rod 21, the U-shaped support frame 22, the mixing motor 23, the rotating disk 24, and the connecting rod 25, the mixing and insulation box 2 has a uniform mixing function, so that the plastic additives and the raw materials can be fully and evenly mixed, thereby preventing the uneven distribution of the plastic additives, thereby improving the quality of the plastic parts. In specific implementation: when the raw materials and the plastic additives need to be mixed, the mixing motor 23 can be turned on. At this time, the connecting rod 17 will automatically perform reciprocating linear motion due to the rotating disk 24 and the connecting rod 25, thereby driving the sliding rod 18 and the mixing frame 19 to perform reciprocating linear motion together, so that the raw materials and the plastic additives in the mixing and insulation box 2 can be quickly and evenly mixed, thereby achieving automatic rapid mixing and even mixing.

[0058] By arranging the push plate 5, the sealing sleeve 26, the L-shaped driving frame 27, the driving block 28, the threaded rod 29, the connecting seat 30, and the stepping motor 31, the push plate 5 has a precise extrusion function, and the extrusion amount can be precisely controlled, thereby preventing the situation of over-extrusion or under-extrusion, thereby ensuring the quality of the plastic parts. In specific implementation: when a certain amount of extrusion is required, the feeding motor 12 and the mixing motor 23 can be controlled to stop, and the mixing frame 19 can be placed in the receiving groove, and then the stepping motor 31 is turned on. At this time, the driving block 28 will automatically move due to the threaded rod 29, so that the push plate 5 can be automatically moved by the L-shaped driving frame 27, so that the push plate 5 can automatically approach the extrusion nozzle 7, and the movement amount of the push plate 5 can be controlled to control the extrusion amount of the raw material, thereby realizing precise extrusion and quantitative extrusion, and all the raw materials in the mixing and insulation box 2 can be squeezed out, so that no raw materials will be wasted.

[0059] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A polypropylene foam particle mixing and extrusion device, characterized in that: include: Bottom plate (1); A mixing and heat-insulating box (2), the mixing and heat-insulating box (2) being arranged on the upper side of the bottom plate (1), an automatic melting and feeding device being arranged on the lower side of the mixing and heat-insulating box (2), and an automatic mixing device being arranged on one side of the mixing and heat-insulating box (2); A plurality of connecting legs (3), one end of each of the connecting legs (3) being fixed to an outer side of the mixing and heat preservation box (2), and the other end of each of the connecting legs (3) being fixed to an upper side of the bottom plate (1); A fixed cover (4), the fixed cover (4) being fixed to one side of the opening of the mixing and heat preservation box (2); A push plate (5), the push plate (5) being slidable inside the mixing and heat preservation box (2), and an automatic moving device being provided on one side of the push plate (5); An electrically controlled valve (6), the electrically controlled valve (6) being fixedly connected to a side of the mixing and heat preservation box (2) away from the fixed cover (4) via a pipeline, and the electrically controlled valve (6) needs to be connected to an external power source and a switch via a wire; An extrusion nozzle (7), wherein the extrusion nozzle (7) is fixedly connected to the other side of the electric control valve (6); The automatic mixing device comprises a connecting rod (17), an automatic reciprocating motion device is provided between the connecting rod (17) and the bottom plate (1), a plurality of sliding rods (18) are fixedly provided on one side of the connecting rod (17), a mixing frame (19) is fixedly provided on the other end of the sliding rod (18), a plurality of receiving grooves are provided on one side of the mixing and heat preservation box (2), the mixing frame (19) is detachably provided on the inner side of the receiving groove, a through hole is provided on one side of the receiving groove, a sealing ring (20) is fixedly provided on the inner side of the through hole, the sliding rod (18) is slidable on the inner side of the sealing ring (20), a plurality of guide holes are provided on one side of the connecting rod (17), a guide rod (21) is slidably provided on the inner side of the guide hole, and one end of the guide rod (21) is fixed on the outer side of the mixing and heat preservation box (2); The automatic reciprocating motion device comprises a U-shaped support frame (22), the U-shaped support frame (22) being fixed on the upper side of the bottom plate (1), a mixing motor (23) being fixedly provided on one side of the U-shaped support frame (22), a rotating disk (24) being fixedly provided on the shaft end of the mixing motor (23), a connecting rod (25) being rotatably provided on one side of the rotating disk (24), the other end of the connecting rod (25) being rotatably connected to one side of the connecting rod (17), and the mixing motor (23) needs to be externally connected to a power supply and a switch via a wire.

2. A polypropylene foam particle mixing and extrusion device according to claim 1, characterized in that: The automatic melting feeding device comprises a feeding pipe (8), a feeding hole is provided on the lower side of the mixing and heat-insulating box (2), the feeding pipe (8) is fixed inside the feeding hole, an electric heating ring (9) is fixed outside the feeding pipe (8), a support plate (10) is fixed at one end of the feeding pipe (8), an axial hole is provided on one side of the support plate (10), a feeding shaft (11) is rotatably provided inside the axial hole, a feeding motor (12) is fixed at one end of the feeding shaft (11), and a plurality of L-shaped frames (13) are fixed outside the feeding motor (12). The L-shaped frame (13) is fixed on one side of the support plate (10); a spiral blade (14) is fixedly provided on the outer side of the feed shaft (11); the spiral blade (14) is arranged on the inner side of the feed pipe (8); a plurality of mounting holes are provided on the outer side of the feed pipe (8); a feed hopper (15) is fixedly provided on the inner side of the mounting holes; a support rod (16) is fixedly provided on one side of the feed hopper (15); one end of the support rod (16) is fixed on the upper side of the bottom plate (1); the feed motor (12) and the electric heating ring (9) are both required to be connected to an external power supply and a switch through wires.

3. The polypropylene foam particle mixing and extrusion equipment according to claim 1, characterized in that: A sealing sleeve (26) is fixedly provided on the outer side of the push plate (5), and the sealing sleeve (26) can slide on the inner side of the mixing and heat preservation box (2).

4. The polypropylene foam particle mixing and extrusion equipment according to claim 2, characterized in that: The automatic moving device comprises an L-shaped driving frame (27), one end of the L-shaped driving frame (27) is fixed on one side of the push plate (5), one side of the fixed cover (4) is provided with a through hole, the L-shaped driving frame (27) can slide inside the through hole, one side of the L-shaped driving frame (27) is fixedly provided with a driving block (28), the driving block (28) can slide on the upper side of the bottom plate (1), one side of the driving block (28) is provided with a threaded hole, the inner side of the threaded hole is provided with a threaded rod (29) through a threaded connection, the outer side of the threaded rod (29) is rotatably provided with a plurality of connecting seats (30), one end of the threaded rod (29) is fixedly provided with a stepping motor (31), the connecting seat (30) and the stepping motor (31) are both fixed on the upper side of the bottom plate (1), and the stepping motor (31) needs to be externally connected to a driving controller and a power supply through wires.

5. The polypropylene foam particle mixing and extrusion equipment according to claim 1, characterized in that: A plurality of heat-insulating sheets (32) are fixedly provided on the outside of the mixing and heat-insulating box (2).

6. The polypropylene foamed particle mixing and extrusion equipment according to claim 4, characterized in that: The method of use includes the following steps: S100, placing raw materials and plastic additives into a feed hopper (15); S200, turning on the electric heating ring (9) and keeping it on for a certain period of time; S300, turning on the feeding motor (12) and the mixing motor (23), and controlling the electronically controlled valve (6) to open, so that automatic mixing and extrusion can be performed; S400, when it is necessary to completely extrude the raw materials in the mixing and heat-insulating box (2) or extrude a certain amount of raw materials, the feeding motor (12) and the mixing motor (23) are controlled to stop, and the mixing frame (19) is placed in the receiving groove, and then the stepper motor (31) is turned on to make the push plate (5) automatically approach the extrusion nozzle (7). When the raw materials in the mixing and heat-insulating box (2) are completely extruded, the push plate (5) is reset by the stepper motor (31).

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