CN2628178Y

CN2628178Y - Electromagnetic heating composite pipe drawbench

Info

Publication number: CN2628178Y
Application number: CN 03234500
Authority: CN
Inventors: 阮仕杰
Original assignee: JINNIU QIXING NEW TECHNOLOGY APPLIANCE INST CHENGDU CITY
Current assignee: Chengdu Tongshu Technology Development Co., Ltd.
Priority date: 2003-05-22
Filing date: 2003-05-22
Publication date: 2004-07-28
Anticipated expiration: 2013-05-22

Abstract

An electromagnetic heating compound pipe draw bench comprises a draw bench, and is characterized in that: Ttwo or more pipe constraint devices 2 for pipe positioning are arranged at the pipe intake end; The electromagnetic coil 3 for heating is roundly made by a plurality turns of copper tubes, one end of which is connected with the output of cooling water pump 4, and the other end of which is communicated with the cycle water tank 5; Both ends of the electromagnetic coil 3 are connected with the output of power switch; The working frequency lies between working frequency and high frequency. In working condition, turn on the power switch in advance, the electromagnetic coil 3 produces high frequency magnetic field, to make the outer metal pipe A by compound pipe 1 to be heated, and transfer heating to the inner plastic pipe B, the surface of inner plastic pipe B has already reached or has been close to the melting state, the thin layer plastics will be pushed into the metal shallow pool C of swallow tail shape, the expand on heating and contract on cooling or other influences is effectively eliminated after cooling down, which makes the changes in length to be satisfied.

Description

Electromagnetism heating multiple tube drawbench

Technical field

What the utility model utility model related to is a kind of new tubing heating multiple tube drawbench.Here the tubing of saying is meant the multiple tube of metal and plastics, and promptly pipe has two-layerly, and skin is a metal, for example iron or aluminium, and internal layer is plastics, for example polypropylene or polyethylene.

Background technology

Traditional drawbench, it carries out combination process is under the condition of external diameter less than the internal diameter of outer tube of interior pipe, and interior pipe is put into outer tube, under the effect of drawbench the external diameter of metal tube is diminished then, makes that two pipes are compound to be one.But the thermal coefficient of expansion of this two-layer pipe differs greatly, under the effect of thermal stress, plastic tube axially and radially all to increase.So the switch pipe fitting just may be loose by the plastic tube top, even leak squib.

In drawing process, heat metal tube, use conventional methods, as resistance wire, electric furnace pan, heating collar or the like, all lead in crossing indirect mode and heat.Such as with resistance wire heating, be wrapped in a metal tube (that is: heating tube) when going up with the resistance wire of putting on small porcelain tube earlier, its internal diameter is bigger slightly than the external diameter of the multiple tube that will heat.After the energising, the heating tube pipe is heating earlier, gives air with heat radiation then, and air is passed to heat the multiple tube of the inside again, after the multiple tube outer layer metal tube is heated, again heat is passed to plastic tube.So whole heating process is long, the link of process is many, make multiple tube reach the drawing temperature, must allow each root multiple tube could work after static one short time of heating, because the number of turns of resistive heater is abundant, be that axial heated length is long, therefore part temperature rise ratio back foremost is low, and it is inevitable promptly heating inhomogeneous.In addition, the mobile also just temperature rise reduction of air.Generally speaking, this class mode of heating energy consumption is big, and heat is imitated low; Temperature rise speed is slow; Inhomogeneous, instability; The whole drawing flow process intermittent time is long, and work efficiency is not high.

Summary of the invention

The purpose of this utility model is to overcome multiple tube that the drawbench of prior art makes under the effect of thermal stress, plastic tube axially and the shortcoming that radially all will increase, a kind of electromagnetism heating multiple tube drawbench is provided.The adhesion of two-layer pipe is strong in the multiple tube of its manufacturing.

Technical scheme: the utility model is taked following measure, to increase the adhesion of two-layer pipe.

Electromagnetism heating multiple tube drawbench comprises drawbench, it is characterized in that: at the inlet pipe end of drawbench, 2 or 2 above pipeline constrainer 2 being used for the pipeline location are installed, the solenoid 3 that is used to heat, cooling water pump 4 and cyclic water tank 5; Solenoid 3, by some circle copper pipe coileds, an end links to each other with the outlet of cooling water pump 4, and the other end communicates with cyclic water tank 5, and solenoid 3 two ends join with the output of Switching Power Supply again, and the operating frequency of Switching Power Supply is between power frequency and high frequency.

Described electromagnetism heating multiple tube drawbench, it is characterized in that: every pipeline constrainer 2 is made of 2 to 6 roll adjustment parts 22, and roll adjustment parts 22 comprise: roll adjustment wheel 15 is installed in the through hole of pedestal 18 by rotating shaft 16, nut 17, can rotate; The cross-wise direction of pedestal 18 has the rib 23 of protrusion, and the cross-wise direction of abase frame 24 has the square groove that falls in, so pedestal 18 can slide on abase frame 24; Pedestal 18 links by screw thread with screw rod 19 again, and screw rod 19 1 ends pass the through hole 25 of pedestal 18, on the both sides of through hole 25 limited block 21 are arranged respectively, with screw rod 19 for being fixedly connected; Handler 20 is fixedly connected on the end of screw rod 19, has the internal thread 26 in the hole in external screw thread and support frame 24 upper ends to cooperate on the screw rod 19.

Operation principle: as Fig. 4, shown in Figure 6, the inwall of metal tube A is before making pipe, and available plant equipment processes crisscross " dovetail " shape shallow slot C.

See Fig. 1, when drawbench was worked, motor 13 made tractor 8 move along recessing 12 by ring chain 9 and hook bar 10, so snap ring 7 holds the die orifice of multiple tube by drawing head 6, makes the multiple tube reducing.Because active force is very big, the vibration of whole pedestal 14 can make the other end of multiple tube 1 also will rock thereupon.If multiple tube 1 bumps with solenoid 3, want short circuit first; Second to " end in defeat for both sidesboth suffer losses ".This hidden danger has been eliminated in the installation of pipeline constrainer 2, has also guaranteed the uniformity of electromagnetism heating simultaneously.

During work, open Switching Power Supply in advance, solenoid 3 produces high frequency magnetic field, make the outer layer metal tube A heating of multiple tube 1, and heat has been passed to inner layer plastic tube B, and the outer surface of plastic tube B has reached fusion or near molten condition, and these skim plastics will be extruded among the metal shallow slot C of " dovetail " shape and go in drawing process, will eliminate the influence of " expanding with heat and contract with cold " and others after the cooling effectively, make the variation of its length can reach satisfied degree.

Advantage of the present utility model is as follows

The electromagnetism mode of heating that adopts, it is directly multiple tube to be heated, energy loss is few, the utilization rate height; Concentration of energy, temperature rise is rapid, and heat time heating time is only in second, secondly, and its homogeneous heating, not affected by environment.And it is also safer than the resistance wire heating.On the other hand, because make frosting reach fusion or near the needed temperature of molten condition, compare much lower with above-mentioned several application, be that energy consumption is low, so though principle identical all be switching power circuit, specific requirement is different fully, as shown in Figure 5, need for different production, suitably regulate electric parameter, just can make temperature reach the requirement of expection easily.The intermittent time of whole drawing flow process shortens greatly, and production efficiency will significantly improve.

Description of drawings

Fig. 1: the utility model electromagnetism heating multiple tube drawbench structural representation.

Fig. 2: pipeline constrainer 2 structure charts among Fig. 1.

Fig. 3: the pipeline constrainer 2 partial structurtes figure among Fig. 1.

Fig. 4: the multiple tube axial section that the utility model electromagnetism heating multiple tube drawbench is produced.

Fig. 5: the utility model electromagnetism heating multiple tube drawbench is used for the functional-block diagram of the Switching Power Supply of electromagnetism heating.

Fig. 6: the multiple tube radial section figure among Fig. 4.

Fig. 7: D-D direction cutaway view among Fig. 3.

Fig. 8: portion waveshape figure in the Switching Power Supply among Fig. 5.

The specific embodiment:

As Fig. 1, shown in, the inlet pipe end at common drawbench is equipped with pipeline constrainer 2, solenoid 3, and devices such as cooling water pump 4 and cyclic water tank 5, pipeline constrainer 2 is made up of 4 extension sets.Solenoid 3, by some circle copper pipe coileds, an end links to each other with the cooling water delivery side of pump, and the other end communicates with cyclic water tank.During its work, two ends join with the output of Switching Power Supply again.

Shown in Figure 3 as Fig. 2, every extension set is taken turns 15 parts by 4 roll adjustments again and is constituted, roll adjustment wheel 15 is installed in the through hole of pedestal 18 by rotating shaft 16, nut 17, can rotate, the cross-wise direction of pedestal 18 has the rib of protrusion, and the cross-wise direction of abase frame 24 has the square groove that falls in, so pedestal 18 can slide on abase frame 24, pedestal 18 links by screw thread with screw rod 19 again, screw rod 19 1 ends pass the through hole 25 of pedestal 18, on the both sides of through hole 25 limited block 21 is arranged respectively, with screw rod 19 for being fixedly connected.Move handler 20, abase frame 24 is motionless, and pedestal 18 is the lifting along with the rotation of screw rod 19 then, so just can regulate the locus of roll adjustment wheel, and the multiple tube 1 and the gap of solenoid 3 are remained in the reasonable range.

The operation principle of Switching Power Supply as shown in Figure 5, its operating frequency is between power frequency and high-frequency quenching, its target should make the outer layer metal tube A of multiple tube diathermanous rapidly, rather than only is that the top layer is heated.

See Fig. 8, Switching Power Supply comprises: following each several part connects in turn: one is converted to galvanic A/D converter with alternating current, a variable frequency oscillator that produces high frequency electric, the power amplifier that high frequency electric is amplified, an output stage.The A/D converter connects civil power 220V, 50Hz.

Claims

1, electromagnetism heating multiple tube drawbench, comprise drawbench, it is characterized in that:, 2 or 2 above pipeline constrainer (2) being used for the pipeline location are installed at the inlet pipe end of drawbench, the solenoid that is used to heat (3), cooling water pump (4) and cyclic water tank (5); Solenoid (3) is by some circle copper pipe coileds, the one end links to each other with the outlet of cooling water pump (4), the other end communicates with cyclic water tank (5), and solenoid (3) two ends join with the output of Switching Power Supply again, and the operating frequency of Switching Power Supply is between power frequency and high frequency.

2, electromagnetism heating multiple tube drawbench according to claim 1, it is characterized in that: every pipeline constrainer (2) is made of 2 to 6 roll adjustment parts (22), roll adjustment parts (22) comprising: roll adjustment wheel (15) is installed in the through hole of pedestal (18) by rotating shaft (16), nut (17), can rotate; The cross-wise direction of pedestal (18) has the rib (23) of protrusion, and the cross-wise direction of abase frame (24) has the square groove that falls in, and slides so pedestal (18) can be gone up in abase frame (24); Pedestal (18) links by screw thread with screw rod (19) again, and screw rod (19) one ends pass the through hole (25) of pedestal (18), on the both sides of through hole (25) limited block (21) are arranged respectively, with screw rod (19) for being fixedly connected; Handler (20) is fixedly connected on the end of screw rod (19), has the internal thread (26) in the hole in external screw thread and support frame (24) upper end to cooperate on the screw rod (19).