CN208714434U - Screw extruder constant pressure head - Google Patents

Abstract

The utility model discloses a kind of screw extruder constant pressure heads, including discharge barrel, one end of the discharge barrel and the discharge end of screw extruder barrel are installed and are connected, one is at least offered on the cylinder of discharge barrel along axial discharge port, the piston sleeve being connected to discharge barrel is installed in the other end of discharge barrel, piston in the piston sleeve is matched with the barrel dliameter of discharge barrel, the piston is under the control of liquid stream voltage-stabilizing system in axial movement in discharge barrel and on the position balanced each other with extrusion pressure in discharge barrel, equilbrium position locating for piston corresponds to the size that piston opens discharge port.The utility model can set the pressure that barrel pressure especially exports according to the mixing requirement of sizing material, and can automatically keep the stabilization of pressure at outlet of extruder, to keep the performance of glue stuff compounding consistent.

Description

Screw extruder constant pressure head

Technical field

The utility model relates to Screw Extrusion machine equipment, specially a kind of screw extruder constant pressure head.

Background technique

In rubber, plastic processing industry, screw extruder is a kind of mixing, dispersion, plasticizing, molding equipment, is especially existed Rubber processing industry, screw extruder pass through supplement mixing, dispersion, plasticizing equipment frequently as rubber after mixer mixing.

For the screw extruder centainly configured, the pressure in mixing, dispersion, plasticizing effect and machine barrel is closely related. But the pressure of machine barrel is influenced by the resistance of head, screw speed, feeding state, sizing material physical property, Warm status etc. and is become Change, be not very stable, or even fluctuation is very big, as a result causes rubber compounding performance difference very big, has seriously affected the quality of product Stability.

The inside machine barrel compress control method of existing extruder is to add the throttle mechanism of similar valve in machine barrel exit, By the flow of control actual internal area and extrusion sizing material, to control the pressure in machine barrel.But this throttle mechanism can not Actual internal area is automatically adjusted with the pressure change in machine barrel, and the pressure in machine barrel can not be according to the viscoelastic of sizing material The conditions such as property, feeding state, screw speed are preset, and need rule of thumb real-time manual adjustment.

Therefore, existing extruder can neither preset the machine barrel internal pressure of needs, can not keep the pressure in machine barrel Stablize.

Utility model content

For the deficiency for solving prior art problem, the utility model proposes a kind of screw extruder constant pressure heads.

The utility model screw extruder constant pressure head, technical solution includes discharge barrel, one end of the discharge barrel It installs and connects with the discharge end of screw extruder barrel, the other end of discharge barrel is equipped with the piston of matching discharge barrel barrel dliameter, described Piston is under the control of liquid stream voltage-stabilizing system in axial movement in discharge barrel and in the position balanced each other with extrusion pressure in discharge barrel It sets, equilbrium position locating for piston corresponds to the size that piston opens discharge barrel cylinder top discharge mouth.

A kind of structure of the liquid stream voltage-stabilizing system includes piston oil-cylinder, and the piston rod of the piston oil-cylinder connects piston, The piston oil-cylinder is connected on hydraulic control circuit into and out of hydraulic fluid port.

To realize that integrated mounting structure, the piston oil-cylinder connect discharge barrel by piston sleeve, the piston is set to In piston sleeve.

A kind of conventional structure of the discharge port is to be gradually increased from the discharge end of screw extruder barrel along axial direction.

The preferred isosceles fan shape of discharge port.

The utility model has the beneficial effects that

It is outstanding that the utility model screw extruder constant pressure head can set barrel pressure according to the mixing requirement of sizing material It is the pressure of outlet end, and can automatically keep the stabilization of pressure at outlet of extruder, to keep the properties of rubber being kneaded Unanimously.

Detailed description of the invention

Fig. 1 is a kind of structural schematic diagram of embodiment of the utility model.

Fig. 2 is the three-dimensional structure diagram of discharge barrel in Fig. 1 embodiment.

Fig. 3 is the combination assumption diagram of piston and piston sleeve in Fig. 1 embodiment.

Fig. 4 is the structural schematic diagram of piston oil-cylinder in Fig. 1 embodiment, shows the connection relationship of piston rod and piston.

Fig. 5 is the head pressure of extruder and the relation curve of sizing material Mooney viscosity.

Figure number mark: 1, discharge barrel；1-1, nozzle left end；2, discharge port；3, piston；4, piston sleeve；4-1, sleeve body； 5, piston oil-cylinder；6, piston rod；9, hydraulic control circuit.

Specific embodiment

Illustrated embodiment is described further the technical solution of the utility model with reference to the accompanying drawing.

The utility model screw extruder constant pressure head, structure include discharge barrel 1, piston sleeve 4, piston oil-cylinder 5 and hydraulic control circuit 9.

(cylinder internal diameter is for the nozzle left end 1-1 of the discharge barrel 1 (length 360mm) and extruder cylinder of single screw extruder Discharge end installation connection (flange connection) 120mm), in offering an isosceles sector on the cylinder of discharge barrel 1 between two parties The discharge port 2 of shape, along discharge barrel 1 axial direction from left to right, the circumferential size of the discharge port 2 is gradually increased, discharge port 2 is left, The axial length of right end is 283mm, and left end is tip, and right end is bottom end, and the circumferential length of bottom end is 80mm, is squeezed close to single screw rod The junction of machine machine barrel and discharge barrel 1 out is equipped with the thermo detector of measurement extrusion temperature in discharge barrel 1 and detects extrusion pressure Pressure gauge.

The left end sleeve body 4-1 of the piston sleeve 4 and the right end installation connection (flange connection) of discharge barrel 1, it is living Piston 3 (length 550mm) in plug sleeve 4 enters to the left in the cylinder of discharge barrel 1, and the piston 3 has and discharge barrel 1 The cylinder matched outer diameter of internal diameter (￠ 120mm).

The left end of the piston oil-cylinder 5 and the right end installation connection (flange connection) of piston sleeve 4, piston oil-cylinder 5 Piston rod 6 enter piston sleeve 4 cylinder in connect with piston 3, piston rod 6 entrance piston sleeve 4 stroke be 360mm, Piston oil-cylinder 5 is connected to hydraulic control circuit 9 (including motor, hydraulic pump, overflow valve and directional control valve into and out of hydraulic fluid port Etc. hydraulic components) on, the hydraulic control circuit 9 can set piston oil-cylinder 5 with the constant pressure between 0~25MPa.

The working principle of the utility model are as follows:

The hydraulic control circuit 9, which can set the pressure of output and automatically keep pressure, to be stablized, and the hydraulic control is returned Road 9 controls the piston rod 6 in piston oil-cylinder 5, and the piston 3 in piston rod 6 and piston sleeve 4 links, and piston 3 controls discharge barrel 1 2 circulation area of discharge port size, the size of 2 circulation area of discharge port with piston 3 pressure change, also with single screw rod The pressure change of extruder barrel outlet.

When one timing of output pressure of hydraulic control circuit 9, the size of 2 circulation area of discharge port is only with single screw extrusion machine The outlet pressure of machine barrel changes, and the pressure of extruder cylinder of single screw extruder outlet is consistent with the pressure of piston 3；When single screw rod is squeezed The factor that the feeding capacity of machine spout, the revolving speed of screw rod, viscoplasticity of sizing material of feeding etc. influence extruder production capacity out becomes When change, corresponding change occurs for the size of 2 circulation area of discharge port, and the automatic pressure for maintaining extruder cylinder of single screw extruder outlet is not Become, to remain that the performance of glue stuff compounding relevant to pressure is consistent.

The side for keeping screw extruder outlet pressure stable using the utility model screw extruder constant pressure head Method are as follows:

The pressure of output is set by hydraulic control circuit 9 and automatically keeps pressure and is stablized, and the control of hydraulic control circuit 9 is lived The flexible of the piston rod 6 in oil cylinder 5 is filled in, piston rod 6 is connect with the piston 3 in piston sleeve 4, thus with piston 3 in piston It is slided in sleeve 4 and discharge barrel 1, piston 3 determines the openings of sizes of discharge port 2 (i.e. in the position of the discharge port 2 of discharge barrel 1 Actual circulation size), position of the piston 3 in discharge port 2 depends on the pressure and list of the setting output of hydraulic control circuit 9 The equilbrium position of the pressure of screw extruder barrel outlet.

The utilization of the utility model:

It is a kind of for manufacturing the rubber-based sizing material of semi-steel radial tire tyre surface, mainly have natural rubber in formula, close At rubber, carbon black, white carbon black, sulphur, vulcanization accelerator etc..It is natural rubber, synthetic rubber, carbon black in the sizing compound formula, white Carbon black uses mixer to mix at relatively high temperatures first, plasticates to certain Mooney viscosity, then using open mill compared with low temperature Degree is lower to be added the vulcanizing agents such as sulphur and is uniformly dispersed.

Due to raw material, production technology, the deviation of environment, viscosity, the dispersibility of final sizing material do not meet tyre surface manufacture Technique requirement.If mixer supplement is kneaded, the uniformity of melting temperature is difficult to control, and localized hyperthermia may cause incipient scorch, such as Fruit is supplemented with open mill and is kneaded, then efficiency is lower.Critical issue is either to supplement mixing with mixer or with open mill, The sizing material of expected viscosity is obtained, all more difficult assurance of technological temperature, pressure and time conditions will lean on experience.

And the utility model is configured using screw extruder, mixing is supplemented to sizing material, then temperature is easily controllable, production efficiency It is higher.

Specifically, carrying out supplement mixing, sizing material Mooney viscosity to the sizing material using above-mentioned extruder and constant pressure head (ML100 DEG C of 1+4) 77, it is desirable that supplement be kneaded after Buddhist nun's viscosity be down to 60 and hereinafter, supplement melting temperature control at 100 DEG C and with Under.

By test, the relationship of the pressure of the utility model screw rod constant pressure head and sizing material Mooney viscosity at 100 DEG C Curve is as shown in Figure 5.Set the pressure 11Mpa of constant pressure head, Buddhist nun's viscosity 56~59 after sizing material supplement is kneaded.

Claims (4)

1. screw extruder constant pressure head, it is characterised in that: including discharge barrel (1), one end of the discharge barrel (1) and screw rod The discharge end of extruder barrel installs connection, and the other end of discharge barrel (1) is equipped with the piston (3) of matching discharge barrel (1) barrel dliameter, institute Piston (3) is stated to move axially in the discharge barrel (1) and be in and discharge barrel (1) interior extrusion pressure under the control of liquid stream voltage-stabilizing system On the position balanced each other, equilbrium position locating for piston (3) corresponds to piston (3) and opens discharge barrel (1) cylinder top discharge mouth (2) Size.

2. screw extruder constant pressure head according to claim 1, it is characterised in that: the liquid stream voltage-stabilizing system piston The piston rod (6) of oil cylinder (5), the piston oil-cylinder (5) connects piston (3), and the piston oil-cylinder (5) connects into and out of hydraulic fluid port On hydraulic control circuit (9).

3. screw extruder constant pressure head according to claim 2, it is characterised in that: the piston oil-cylinder (5) passes through Piston sleeve (4) connects discharge barrel (1), and the piston (3) is set in piston sleeve (4).

4. screw extruder constant pressure head according to any one of claims 1 to 3, it is characterised in that: it is described go out Material mouth (2) is gradually increased from the discharge end of screw extruder barrel along axial direction.