CN114147908A

CN114147908A - Polystyrene foaming process and foaming system

Info

Publication number: CN114147908A
Application number: CN202111499557.0A
Authority: CN
Inventors: 翟洪军
Original assignee: Changzhou Shunweier Material Technology Co ltd
Current assignee: Changzhou Shunweier Material Technology Co ltd
Priority date: 2021-12-09
Filing date: 2021-12-09
Publication date: 2022-03-08

Abstract

The invention discloses a polystyrene foaming process and a foaming system: the foaming process comprises the following steps: putting the polystyrene master batch, the foaming agent and the additive into a pre-foaming machine; simultaneously heating the barrel wall of the pre-foaming machine barrel body, the stirring device and the stirring device in the barrel body, and stirring while heating; and opening a discharge hole at the bottom of the barrel body when the polystyrene particles are foamed to a preset target value A. The polystyrene foaming system comprises a barrel body and a stirring device arranged in the barrel body, and a hollow cavity for communicating steam is arranged in the barrel wall of the barrel body; the stirring device comprises a stirring shaft arranged at the axis position of the barrel body, the side part of the stirring shaft is provided with a spiral stirring blade, the stirring shaft is of a hollow structure, two ends of the stirring shaft are communicated with heat conduction oil, and a flow channel communicated with the hollow structure of the stirring shaft is arranged inside the spiral stirring blade. The invention adopts three heating modes to foam the polystyrene particles, so that the heating is more uniform and efficient, and the humidity of the polystyrene particles is easier to control.

Description

Polystyrene foaming process and foaming system

Technical Field

The invention relates to the technical field of polystyrene plate processing, in particular to a polystyrene foaming process and a polystyrene foaming system.

Background

Polystyrene products (mostly plates) need to be foamed into master batches of polystyrene in the production process, and the foaming process in the prior art usually adopts a pre-foaming machine for foaming, and the general principle is that the master batches are heated to be foamed into a preset volume. The foaming process usually adopts steam to carry out direct contact heating, then drying, cooling through the fluidized bed, if will promote foaming temperature or foaming efficiency just must increase the steam volume, this water content in will corresponding increase master batch is unfavorable for controlling foaming effect. Moreover, in the prior art, a continuous pre-foaming machine or an intermittent pre-foaming machine is usually adopted to foam the master batch, the volume weight of the foaming particles is difficult to control, and the efficiency is not high, and the latter is intermittent discharging, so that the subsequent process steps cannot be continuously carried out.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides a polystyrene foaming process and a polystyrene foaming system.

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

the polystyrene foaming process comprises the following steps: comprises the following steps:

putting the polystyrene master batch, the foaming agent and the additive into a pre-foaming machine;

simultaneously heating the barrel wall of the pre-foaming machine barrel body, the stirring device and the stirring device in the barrel body, and stirring while heating;

opening a discharge hole at the bottom of the barrel body when the polystyrene particles are foamed to a preset target value A;

and conveying the foamed polystyrene particles to the fluidized bed through the spiral conveyor, screening the polystyrene particles with the foaming degree lower than a preset target value A in the conveying process of the spiral conveyor, and delivering the polystyrene particles to the inside of the barrel body again.

The preset target value A means that the volume of the polystyrene particles is increased by 50 times relative to the volume of the polystyrene master batch.

The barrel wall of the pre-foaming barrel body and the inside of the barrel body are heated through steam, and the stirring device is heated through heat conduction oil.

Polystyrene foaming system: comprises a barrel body and a stirring device arranged in the barrel body, wherein a hollow cavity used for communicating steam is arranged in the barrel wall of the barrel body;

the stirring device comprises a stirring shaft arranged at the axis position of the barrel body, the side part of the stirring shaft is provided with a spiral stirring blade, the stirring shaft is of a hollow structure, two ends of the stirring shaft are communicated with heat conduction oil, and a flow channel communicated with the hollow structure of the stirring shaft is arranged inside the spiral stirring blade.

Preferably, the polystyrene foaming system described previously: the runner includes that two set up respectively in the radial runner at spiral stirring leaf both ends, a plurality of rotatory spiral runners along spiral stirring leaf, and the both ends of all spiral runners switch on respectively in two radial runners.

Preferably, the polystyrene foaming system described previously: the stirring shaft is internally provided with a plurality of radially arranged clapboards which are provided with through holes.

Preferably, the polystyrene foaming system described previously: the through holes are distributed at the axial position of the partition plate and relatively far away from the spiral stirring blade, and the inner diameter of each through hole is 1/5-1/10 of a radial flow passage.

Preferably, the polystyrene foaming system described previously: the bottom of the barrel body is connected with the feeding end of the spiral material conveying machine through a discharging port, the discharging port is provided with a discharging pipe, the end part of the discharging pipe is provided with a hinged baffle plate, the surface of the hinged baffle plate is matched with the contour of the inner wall of the barrel body, and the hinged baffle plate is driven by an air cylinder arranged in the discharging pipe.

Preferably, the polystyrene foaming system described previously: the discharge end of the spiral material conveyor is connected with the fluidized bed, the bottom of the spiral material conveyor is provided with meshes, the bottom of the meshes is provided with a material collecting channel, and the lower end of the material collecting channel is provided with a material collecting barrel.

Preferably, the polystyrene foaming system described previously: the diameter of the spiral stirring blade is sequentially increased from top to bottom, and the bottom of the spiral stirring blade is attached to the surface of the bottom of the barrel body.

The invention achieves the following beneficial effects: the invention adopts three heating modes to foam the polystyrene particles, so that the heating is more uniform and efficient, and because of the existence of other two non-direct contact heating modes, the steam quantity and the steam temperature of the part directly contacting the master batch are easier to control, and the humidity of the polystyrene particles after foaming is better controlled.

According to the invention, the bottom of the spiral stirring blade is contacted with the bottom of the barrel body, and the diameter of the spiral stirring blade is sequentially increased from top to bottom, so that materials in the whole barrel body are stirred more uniformly, and the materials conveyed to the upper layer of the barrel body are more easily slipped off from the upper part of the spiral stirring blade, so that master batches can form a master batch loop with ascending middle part and descending periphery in the barrel body, and the stirring efficiency is improved. The inner surface profile of the hinged baffle is matched with the inner surface profile of the barrel body, so that no stirring blind area exists in the barrel body. The spiral feeder can carry out certain screening and filtration to the polystyrene granule after the foaming at defeated material in-process, has further promoted the foaming quality.

Drawings

FIG. 1 is a front view of the overall construction of the foaming system of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at B;

FIG. 3 is an enlarged view of a portion of FIG. 1 at C;

FIG. 4 is a sectional view of the screw conveyor;

the meaning of the reference numerals: 1-barrel body; 2-stirring shaft; 3-spiral stirring blade; 4-a discharge hole; 5-a spiral material conveyer; 6-a collecting barrel; 7-a fluidized bed; 11-a steam connection port; 12-a feed inlet; 13-a hollow cavity; 21-a separator; 22-a through hole; 31-a radial flow channel; 32-a spiral flow channel; 41-a discharge pipe; 42-hinged flaps; 43-cylinder; 51-mesh; 52-aggregate channel.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

This example discloses a polystyrene foaming process: comprises the following steps: putting polystyrene master batches, a foaming agent and an additive (usually a flame retardant) into a pre-foaming machine; simultaneously heating the barrel wall of the pre-foaming barrel body 1, the stirring device and the stirring device at the barrel body 1 part, and stirring while heating; when the polystyrene particles are foamed to a preset target value A, opening a discharge port 4 of the barrel body 1; the polystyrene particles after foaming are conveyed to the fluidized bed 7 through the spiral conveyor 5, and in the conveying process of the spiral conveyor 6, the polystyrene particles with the foaming degree lower than a preset target value A are screened out and are delivered to the inside of the barrel body again.

The preset target value a in this embodiment means that the polystyrene particles are increased by 50 times in volume relative to the polystyrene master batch, and the master batch with a foaming volume not reaching 50 times can be removed by stirring and filtering.

In the above-mentioned heating process, heat the bucket wall and 1 inside staving of pre-expander staving 1 through steam, heat agitating unit through the conduction oil, wherein only directly can contact the master batch to the steam of 1 inside heating part of staving, consequently can reduce the humidity of master batch to because the collaborative heating of other two kinds of modes, the volume of the steam of direct 1 inside heating to staving is controlled more easily. The steam accessible that directly heats to staving 1 inside switches on the steam return circuit of staving 1 upper and lower extreme respectively and realizes, and this mode belongs to prior art.

As shown in fig. 1 to 4: this embodiment has still disclosed the polystyrene foaming system that can be used to above-mentioned foaming process, specifically contains staving 1 and sets up in the agitating unit of staving 1 inside, is equipped with the cavity 13 that is used for putting through steam in the section of thick bamboo wall of staving 1. That is to say: the barrel wall of the barrel body 1 is of a two-layer structure, the middle of the barrel body is connected through partial welding points or connecting pieces, an interlayer cavity is arranged between the two-layer structure, and the interlayer cavity is communicated with a steam generating device through two steam connectors 11 arranged at opposite angles to heat the barrel wall. The tub 1 is preferably vertically disposed.

The stirring device comprises a stirring shaft 2 arranged at the axis position of the barrel body 1, the side part of the stirring shaft 2 is provided with a spiral stirring blade 3, the stirring shaft 2 is of a hollow structure, two ends of the stirring shaft are communicated with heat conduction oil, and a flow channel communicated with the hollow structure of the stirring shaft 2 is arranged inside the spiral stirring blade 3. Specifically, the method comprises the following steps: the flow channels include two radial flow channels 31 respectively disposed at two ends of the spiral stirring blade 3, and a plurality of spiral flow channels 32 rotating along the spiral stirring blade 3, and two ends of all the spiral flow channels 32 are respectively connected to the two radial flow channels 31. The radial flow channel 31 is equivalent to a main flow channel of the spiral stirring blade 3, the spiral flow channel 32 is equivalent to a branch flow channel of the spiral stirring blade 3, and the number of the spiral flow channels 32 is usually 5-8. Since the spiral stirring vane 3 has a spiral structure, the spiral flow passage 32 is not easy to be processed, and therefore, the spiral flow passage 32 may be a heat pipe (usually, a copper pipe) welded on the surface of the spiral vane.

The diameter of the spiral stirring blade 3 is sequentially increased from top to bottom, and the bottom of the spiral stirring blade 3 is attached to the bottom surface of the barrel body 1. A specific illustration can be seen in fig. 1 with two dashed lines a. This has the advantage that the material at the bottom of the barrel 1 can be more easily transported to the upper side; secondly, the material above the barrel body 1 is easier to fall back to the bottom of the barrel body 1 again.

Since the present embodiment also needs to heat the stirring shaft 2 itself, a plurality of radially arranged partition boards 21 are arranged inside the stirring shaft 2, and the partition boards 21 are provided with through holes 22. The through holes 22 and the radial flow channels 31 jointly form a flow dividing loop of the two heat conducting oil flow channels, and in order to improve the heating effect and the heating uniformity, the through holes 22 are distributed at the axial positions of the partition plates 21 and relatively far away from the spiral stirring blades 3. Because spiral stirring leaf 3 self inside has spiral runner 32 to heat, and the (mixing) shaft 2 that contacts with spiral stirring leaf 3 is also higher relatively high in temperature, and the spiral stirring leaf 3 junction temperature of (mixing) shaft 2 is higher promptly, for making the holistic temperature of (mixing) shaft 2 comparatively even, the accessible increases the inside spiral stirring leaf 3 opposite side heat conduction oil mobility's of (mixing) shaft mode realization to (mixing) shaft 2 heating compensation.

On the other hand, in order to avoid excessive direct flow of the heat transfer oil inside the stirring shaft 2 from the through hole 22 and to avoid a small flow rate of the heat transfer oil inside the helical stirring blade 3, the inner diameter of the through hole 22 needs to be limited, and therefore, the inner diameter of the through hole 22 is 1/5 to 1/10 of the radial flow passage 31.

The bottom of the barrel body 1 is connected with the feeding end of the spiral material conveyer 5 through a discharging hole 4, the discharging hole 4 is provided with a discharging pipe 41, and the end part of the discharging pipe 41 is provided with a hinged baffle 42 the surface of which is matched with the contour of the inner wall of the barrel body 1. The hinged flap 42 is pivoted by means of a pneumatic cylinder 43 arranged inside the tapping pipe 41. A sealing structure is usually arranged between the hinged baffle 42 and the discharge pipe 41 to ensure the tightness of the discharge hole 4 in a non-discharge state. When the hinged flap 42 is in the closed state, its inner surface matches the contour of the inner surface of the tub 1 at the corresponding position without affecting the smoothness of the inner surface of the tub 1.

The discharge end of the spiral conveyor 5 is connected with the fluidized bed 7, the bottom of the spiral conveyor 5 is provided with meshes 51, and the aperture of the meshes 51 is related to the polystyrene particles to be foamed. When the polystyrene particles after foaming are conveyed inside the spiral conveyor 5, the spiral conveyor 5 can be repeatedly turned inside, the polystyrene particles which do not reach the standard after foaming can be leaked from the material collecting channel 52 due to small volume and slide down along the material collecting channel 52 at the bottom of the mesh 51, and the lower end of the material collecting channel 52 is provided with a material collecting barrel 6 for collecting materials.

When the device works, polystyrene master batches, foaming agents and additives are fed into the barrel body 1 from the feeding hole 12 above the barrel body 1. Steam enters the interlayer cavity of the barrel body 1 through the steam connecting port 11 to heat the barrel body 1, and part of the steam directly enters the barrel body 1 to heat the mixture. The heat conducting oil heats the whole stirring device. The three heating modes enable the heating of the internal materials to be more uniform and efficient, and due to the existence of the other two non-direct contact heating modes, the steam quantity and the steam temperature of the part which is directly contacted with the master batch are easier to control, so that the humidity of the polystyrene particles after foaming is better controlled.

The bottom of this embodiment spiral stirring leaf 3 contacts the bottom of staving 1 to the diameter from the top down of spiral stirring leaf 3 increases in proper order, makes the material stirring of 1 inside whole staving more even, and the material of being carried to 1 upper strata of staving also more easily from the 3 top landing of spiral stirring leaf, can make the master batch rise in the middle of 1 inside formation of staving, the master batch return circuit that descends all around, promotes stirring efficiency. The inner surface profile of the hinged baffle 42 is matched with the inner surface profile of the barrel body 1, so that no stirring blind area exists in the barrel body 1.

The spiral material conveyor 5 can screen and filter the polystyrene particles after foaming to a certain extent in the material conveying process, so that the foaming quality is further improved.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. The polystyrene foaming process is characterized by comprising the following steps: comprises the following steps:

2. The polystyrene foaming process of claim 1, wherein: the preset target value A is that the volume of the polystyrene particles is increased by 50 times relative to the volume of the polystyrene master batch.

3. The polystyrene foaming process of claim 1, wherein: the barrel wall of the pre-foaming barrel body and the inside of the barrel body are heated through steam, and the stirring device is heated through heat conduction oil.

4. Polystyrene foaming system, its characterized in that: the steam-water mixing barrel comprises a barrel body (1) and a stirring device arranged inside the barrel body (1), wherein a hollow cavity (13) used for communicating steam is arranged in the barrel wall of the barrel body (1);

the stirring device comprises a stirring shaft (2) arranged at the axis position of the barrel body (1), wherein the side part of the stirring shaft (2) is provided with a spiral stirring blade (3), the stirring shaft (2) is of a hollow structure, two ends of the stirring shaft are communicated with heat conduction oil, and a flow channel communicated with the hollow structure of the stirring shaft (2) is arranged inside the spiral stirring blade (3).

5. The polystyrene foaming system of claim 4, wherein: the flow channel comprises two radial flow channels (31) which are respectively arranged at two ends of the spiral stirring blade (3), a plurality of spiral flow channels (32) which rotate along the spiral stirring blade (3), and two ends of all the spiral flow channels (32) are respectively communicated with the two radial flow channels (31).

6. The polystyrene foaming system of claim 5, wherein: the stirring shaft (2) is internally provided with a plurality of radially arranged partition plates (21), and the partition plates (21) are provided with through holes (22).

7. The polystyrene foaming system of claim 6, wherein: the through holes (22) are distributed at the axial position of the partition plate (21) and relatively far away from the spiral stirring blade (3), and the inner diameter of each through hole (22) is 1/5-1/10 of the radial flow passage (31).

8. The polystyrene foaming system of claim 4, wherein: the bottom of staving (1) is passed through discharge gate (4) and is connected the feed end of screw feeder (5), discharge gate (4) are equipped with discharging pipe (41), the tip of discharging pipe (41) is equipped with surface and staving (1) inner wall profile assorted articulated baffle (42), articulated baffle (42) are through setting up in inside cylinder (43) drive of discharging pipe (41).

9. The polystyrene foaming system of claim 8, wherein: fluidized bed (7) is connected to the discharge end of spiral feeder (5), the bottom of spiral feeder (5) is equipped with mesh (51), mesh (51) bottom is equipped with aggregate passage (52), the lower extreme of aggregate passage (52) is equipped with collecting vessel (6).

10. The polystyrene foaming system of claim 4, wherein: the diameter of the spiral stirring blade (3) is sequentially increased from top to bottom, and the bottom of the spiral stirring blade (3) is attached to the surface of the bottom of the barrel body (1).