CN2316119Y

CN2316119Y - Melt pressure driven type plastic tube extrusion rotating head

Info

Publication number: CN2316119Y
Application number: CN97249666U
Authority: CN
Inventors: 金学厚
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-11-26
Filing date: 1997-11-26
Publication date: 1999-04-28
Anticipated expiration: 2007-11-26

Abstract

The utility model relates to a melt pressure driven type plastic tube extrusion rotating machine head. The lower end surface of a rotary mold core is attached to the upper end surface of a flow dividing body. The rotary mold core is driven by a driving shaft arranged in the flow dividing body to rotate. The driving shaft is driven by a rotor of an energy conversion device. The energy conversion device is mainly composed of a base, a rotor, a stator, a plunger piston group and relevant pieces. The self pressure of the plastic melt extruded by an extruding machine is used as a power by the utility model. Thus the goals of energy saving, continuous safety production, unevenness improvement of the extruded product thickness and product homogeneity improvement can be achieved. A corresponding material discharge groove is arranged on the rotary mold core. The utility model can be used for producing a tube whose inner wall is provided with a spiral reinforcing rib.

Description

Melt pressure drive-type plastic pipe is extruded rotating head

The utility model relates to device of plastic processing, and a kind of specifically melt pressure drive-type plastic pipe is extruded rotating head, mainly is applicable to produce the polyalkenes plastic pipe.

Extrusion molding is one of main forming method of plastics, it is to be added graininess or powdered plastic in the machine barrel that has heater continuously by loading hopper, with plastics between rotary screw and machine barrel, carry, compression, fusion, plasticizing, by the extrusion die moulding, be required goods behind the cooling and shaping quantitatively.

In the plastic pipe production process, extruder head is one of indispensable critical component, now mainly adopt the head of producing tubing that the core rod type head is arranged, forms such as the board-like pipe die of sieve aperture, but usually be difficult to guarantee the uniformity of product wall thickness for heavy caliber pipe and thin-wall pipes.

In the prior art, the rotary extruding head mainly consists of the following components: drive unit, frame head apparatus and the heating of confession head and the control device of temperature control and the parts such as slip ring commutator of transmission of electric energy.Wherein: drive unit comprises: motor, decelerator and transmission system etc.The rotary plastics pipe extruder head of prior art is because there is following problem in structural limitations in the work:

1. owing to adopt outer type of drive, complex structure, and mechanical device, transmission system and electric power system exist all undesirable elements to influence handling safety in the operation process.

2. the head melt flow channel extends, and plastic melt heated time lengthening causes the strand hot shearing easily, influences physical properties of articles.

3. the problem of melt sealant is difficult for solving, and causes material from leakage easily.

4. drum diameter is bigger, can't use because the increase of the weight of head own causes the driving torque increasing, sealing surface pressure is excessive.

The purpose of this utility model is to overcome above-mentioned deficiency, provide a kind of melt pressure drive-type plastic pipe to extrude rotating head, plastic melt self pressure of extruding with extruder is power, drive the rotation core rod rotation of extruder head, need not to adopt peripheral hardware to drive, reach energy savings, realize the continuity safety in production, and improve the inhomogeneities of extruded product thickness, improve the uniformity of goods.

The purpose of this utility model is achieved in that

A kind of melt pressure drive-type plastic pipe is extruded rotating head, and its structure comprises: handpiece body, rotation core rod, die orifice, branch fluid is characterized in that:

Fitting with dividing the fluid upper surface in rotation core rod lower surface, and drives its rotation by the power transmission shaft that is located at branch fluid inside, and power transmission shaft is driven by the rotor in the energy conversion device;

Energy conversion device mainly is made up of base, rotor, stator, plunger group and associated part; Wherein:

Base links to each other with stator, is provided with the melt-flow circulation passage between base and head connector;

Base is provided with melt feed distribution hole;

Stator links to each other with the branch fluid with base, divides fluid to link to each other with handpiece body, and the stator inner hole surface is for to constitute guide surface continuously by the equally distributed cancave cambered surface of plurality of sections, and each cambered surface is made up of rising section, transition zone and decline section;

The rotor cylindrical floats on the inside of stator, and little gap is arranged respectively between its both ends of the surface and chassis and handpiece body, and with the seal sealing, rotor bore is fixedlyed connected with key with power transmission shaft; Have the plunger hole of some circumference in equal parts radially on the rotor circumference face, the plunger group is housed in each plunger hole, the pressure that can make this group plunger act on guide rail when round guide curved surface rising section is corresponding in the position of each plunger group and the stator forms the tangential forces that promotes the rotor rotation, is positioned at the plunger group that communicates with discharge gate simultaneously and moves and the plastic melt of plunger hole is entered feeding mouth on the branch fluid through the axial admission hole of rotor to travelling backwards under the promotion of stator guiding track curved surface decline section.

The purpose of this utility model can also realize by following measure:

It is that the zero acceleration--Archimedes--that waits waits the acceleration build-up curve to form guide surface that each cambered surface of composition guide surface on the described stator inner peripheral surface adopts ripple factor.

Described plunger group is made up of plunger and steel ball, and steel ball is contained in the hemispherical groove of plunger front end, and plunger is assembled in the radial column consent of rotor and can moves radially, and steel ball contacts the guide surface in stator inner hole.

On the outer circumference surface of described rotation core rod, can offer the rotation direction helical groove identical with its direction of rotation.

The utility model has following actively useful effect:

It is that its core rod rotates that the plastic pipe extruder head of core rod that the utility model relates to rotation is compared with common tubing head, comparing main difference with the spiral reinforced plastics tubing head of other pattern is that it does not have outer drive unit, but the pressure that relies on melt can convert mechanical energy to and the rotation of driven rotary core rod, therefore, it has following advantage:

(1) simple in structure: because this utility model is power with the melt pressure, does not adopt outer the driving, thereby saved parts such as CD-ROM drive motor, deceleration device, transmission device, simple in structure, compact.

(2) do not have the material of leakage problem: owing to adopted melt pressure is power, do not have to drive to connect sealing surface, so the plastic melt leakage problem is avoided.

(3) wide accommodation: because the head appearance integral fixes, energy conversion device is located at head inside, and driving torque is big, in not being only applicable to, small dimension tubing head, also is applicable to the heavy caliber pipe head of external diameter more than 600 millimeters; Be not only applicable to straight tubing, be applicable to soft, the hard polyolefin pipe that the inner wall belt spiral strengthens yet.

(4). owing to there be not parts and the transmission device that rotates, operating process is safer.

(5). the plastic melt pressure that plastic pipe rotation extruder head of the present utility model utilizes extruder to extrude, rely on the inner energy conversion device that is provided with of head, make the pressure of plastic melt can convert mechanical energy to, drive is located at the rotation core rod rotation of head outlet edge, plastic melt is produced to rotatablely move, plastic melt in the runner obtains mixing and homogenising owing to rotatablely move, and the pressure of materials flow and the inhomogeneities of flow velocity are evenly distributed along circumference, thereby produce the uniform goods of thin and thick.If have corresponding discharge groove on the rotation core rod, melt is in discharge process, because rotatablely moving of discharge groove can be produced the tubing that the inner wall belt spiral strengthens muscle (Lai Fuxian).

Now in conjunction with the accompanying drawings with preferred embodiment:

Fig. 1 is that the utility model is applied to the embodiment schematic diagram that plastic tube is extruded rotating head;

Fig. 2 is the side view of Fig. 1;

Fig. 3 is the A-A parting view of Fig. 1;

Fig. 4 is plunger and a rotor motion schematic diagram among Fig. 2, shows that plunger is toward position, feed entrance point;

The same Fig. 4 of Fig. 5 shows plunger return, discharge position;

Fig. 6 is plunger force analysis figure among Fig. 2.

Accompanying drawing number

1. nut 2. rotates core rods 3. die orifices

4. adjust 6. fens fluids of ring 5. handpiece bodies

7. thrust bearing 8. distance collars 9. stators

901. guide surface 10. rotors 11. sealing rings

12. thrust bearing 13. flexible members 14. screws

15. screw 16. is adjusted screw 17. keys

18. thrust bearing 19. radial bearings 20. power transmission shafts

21. key 22. plunger group 22a. plungers

22b. steel ball 23. screws 24. bases

241. the helical groove of offering on the fluid inner chamber 25. rotation core rod cylindricals

A. the axial admission hole on the feed distribution hole b. rotor of offering on the base 24 10

The melt flow channel of c. dividing the charging hole d. that offers on the fluid 6 to divide fluid 6

E. the head circular die is extruded the gap

F. the stator guiding track curved surface acts on the reaction force of plunger

F ' .F is along the component of plunger axis

F " the component of the vertical plunger axis of .F

Please refer to Fig. 1 Fig. 2 Fig. 3, melt pressure drive-type plastic pipe of the present utility model is extruded rotating head, and its casing successively by base 24, stator 9, branch fluid 6, handpiece body 5 and adjustment ring 4, is connected to integral body with

screw

14,23 respectively from bottom to top.

Base 24 centers are provided with the inner bolt hole of the head connector that connects extruder, and this inner bolt hole is communicated with conical ring fluid inner chamber 241;

Stator 29 is the open circles annular, and the stator inner hole surface is for to constitute guide surface continuously by the equally distributed cancave cambered surface of plurality of sections, and each cambered surface is made up of rising section, transition zone and decline section, and the interval certain interval is equipped with rotor 10 in this endoporus;

Divide fluid 6 for there is ring flange the lower end, the upper end is the cylinder of bulge shape curved surface;

Handpiece body 5 is presented the little cylinder of large curved surface circular hole down for inner chamber, forms the melt flow channel d of low wide and up narrow annular chamber shape between the bulge shape curved surface of its inner chamber and branch fluid 6;

Adjust ring 4 for the cylinder of interior shoulder hole is arranged, the lower end of this shoulder hole cooperates with the last male half coupling of handpiece body 5, die orifice 3 is housed in this shoulder hole, appropriate gap 301 is equipped with rotation core rod 2 at interval in the endoporus of die orifice 3, fit by thrust bearing 18 and the upper surface of dividing fluid 6 in the lower end of this rotating mould heart 2, this gap 301 is the plastic pipe extrusion;

Power transmission shaft 20 passes the centre bore of branch fluid 6 and is supported by the bearing 19 that is contained in branch fluid 6 upper and lower ends and 7, this power transmission shaft upper end is fixed in rotation core rod 2 with key 3, the lower end is fixed in rotor 10 with key 21, and by distance collar 8 location, the upper and lower end face of rotor 10 and

branch fluid

6 and 24 of bases have little gap respectively with flexible member 13, and sealing ring 11 is realized sealing;

The inner chamber of base 24 has between centers through hole a can be communicated with the between centers through hole b of rotor 10, and this through hole b can correspondingly divide the between centers hole c of fluid 6 and be communicated with melt flow channel d, extrudes gap e between this melt flow channel connection die orifice 3 and the rotating mould heart;

Have the plunger hole of some circumference in equal parts radially on the periphery of rotor 10, plunger group 22 is housed in each plunger hole, described plunger group 22 is made up of plunger 22a and steel ball 22b, steel ball 22b is contained in the hemispherical groove of plunger 22a front end, plunger 22a is contained in the radial column consent of rotor 10 and can moves radially, and steel ball 22b contacts the guide surface 901 in stator inner hole.The pressure that can make this group plunger act on guide rail when the position of plunger group 22 is corresponding with the rising section of round guide curved surface 901 in the stator 9 forms the tangential forces that promotes the rotor rotation, as shown in Figure 3, (dotted line hole a is the charging hole of offering on the base 24, solid line hole b is the axial material hole on the rotor 10, dash area c is the described minute axial material hole on the fluid 6), Fig. 4 is the rising section at guide surface, when a aperture communicates with the b hole, material enters plunger hole, at this moment, because the upper surface in b hole is shut, the pressure of material promptly promotes plunger group 22 and outwards moves, and the steel ball 22b of plunger group 22 is pressed on the guide rail surface.At contact point, guide surface gives steel ball 22b with reaction force F (see figure 6), because its direction is perpendicular to guide rail surface, and center by steel ball 22b, the reaction force F of guide surface is decomposed into one along the power F ' of plunger group 22 axis and the power F perpendicular to plunger group 22 axis "; the pressure balance that F ' and plunger group 22 are subjected to; F " power produces moment of torsion by the axis of 22 pairs of rotors 10 of plunger group, make rotor 10 rotations, meanwhile, the plunger group 22 that is in decline section (see figure 5) is moved to the center by guide rail thrust, and this moment, the b hole communicated with the c hole; And lower surface, b hole is shut, and plunger group 22 promptly enters hole c to material; Rotor 10 is in the rising section at any instantaneous total porose b, so can rotate continuously; In like manner see Fig. 4, be in the decline section, see Fig. 1 so material can enter the helical flow path d of branch fluid 6 continuously at any instantaneous total porose b.

In Fig. 1 is embodiment illustrated in fig. 2, hole a offers 6, hole b offers 10, and hole c also offers 6, and the position of hole a should be located at guide rail rising section, particular location is to be in guide rail curve rising section initial point when plunger group 22, intersect just in a hole and b hole, and the position of hole c is to be in guide rail curve decline section initial point when plunger group 22, and hole c and hole b intersect in the present embodiment just, hole a and hole b differ 30 degree just, and hole a and hole c are circular hole;

Direction of rotation such as Fig. 4 of rotor 10 are shown in Figure 5, and Fig. 4 shows that plunger is toward position, charging; Fig. 5 shows plunger return, discharge, and the position of exchange hole a and hole c can make direction of rotation change.

In preferred embodiment, it is that the zero acceleration--Archimedes--that waits waits the acceleration build-up curve to form guide surface 901 that each cambered surface of the composition guide surface on the described stator inner peripheral surface adopts ripple factor.

During enforcement, can on the outer circumference surface of rotation core rod 2, offer the rotation direction helical groove 25 identical, promptly can be used for producing the plastic pipe that the inner wall belt spiral strengthens muscle (Lai Fuxian) with its direction of rotation.

Claims

1. a melt pressure drive-type plastic pipe is extruded rotating head, and its structure comprises: handpiece body, rotation core rod, die orifice, branch fluid is characterized in that:

Base is provided with melt feed distribution hole;

2. melt pressure drive-type plastic pipe as claimed in claim 1 is extruded rotating head, it is characterized in that: it is that the zero acceleration--Archimedes--that waits waits the acceleration build-up curve to form guide surface that each cambered surface of the composition guide surface on the described stator inner peripheral surface adopts ripple factor.

3. melt pressure drive-type plastic pipe as claimed in claim 1 is extruded rotating head, it is characterized in that: described plunger group is made up of plunger and steel ball, steel ball is contained in the hemispherical groove of plunger front end, plunger is assembled in the radial column consent of rotor and can moves radially, and steel ball contacts the guide surface in stator inner hole.

4. melt pressure drive-type plastic pipe as claimed in claim 1 is extruded rotating head, it is characterized in that: offer the rotation direction helical groove identical with its direction of rotation on the outer circumference surface of described rotation core rod.