CN102225612B

CN102225612B - Temperature control device for plastic injection mould

Info

Publication number: CN102225612B
Application number: CN 201110139455
Authority: CN
Inventors: 刘朝福; 杨连发
Original assignee: Institute of Information Technology of GUET
Current assignee: Institute of Information Technology of GUET
Priority date: 2011-05-25
Filing date: 2011-05-25
Publication date: 2013-07-03
Anticipated expiration: 2031-05-25
Also published as: CN102225612A

Abstract

The invention discloses a temperature control device for a plastic injection module, and is characterized in that the temperature control device is mainly composed of a flow adjusting unit and a driving unit; the flow adjusting unit comprises a tee joint mechanism consisting of a valve body and a valve plug, the sizes of openings at two outlets of the tee joint mechanism are in an inverse proportion relation under the control of a rotating angle of the valve plug, and an adjusting end of the valve plug is equipped with a gear; the driving unit comprises a cylinder with a heat conductor, an opening end of the cylinder is equipped with a rack piston, and the rack on the rack piston is engaged with the gear. The temperature control device has the advantages of simple structure, low cost, full mechanical structure without any electron component, high reliability and convenient mounting, use and maintenance.

Description

A kind of temperature control equipment for plastic injection mould

Technical field

The present invention relates to plastic injection moulding process, particularly a kind of temperature control equipment for plastic injection mould.

Background technology

Plastic injection mould or title injection mold are one of key equipments of plastic shaping, and owing to its heat that constantly absorbs plastic melt in process of production causes temperature constantly to raise, and too high temperature will cause goods to finalize the design in the mould.But temperature is crossed the low defectives such as melt filling deficiency, product surface flow liner be too much that then can produce in the mould.Therefore, guarantee injection moldingly to carry out smoothly, must adopt suitable method and apparatus with the temperature control of mould within certain scope.Such as, igelite when injection moulding, usually with the surface temperature control of mould between 55～65 ℃.

In plastic injection moulding process, the most frequently used method of injection molding temperature control is: the cooling duct of offering in mould as much as possible is communicated with cooling water, relies on cooling-water flow that heat is taken away, thereby the temperature of mould is controlled within certain scope.The size of the circulation of cooling water flow, disconnection and flow, prior art is controlled by the electronic devices and components of a series of complexity such as temperature sensor, single-chip microcomputer, magnetic valve, adopts this method to have deficiencies such as cost is higher, reliability is low.

Summary of the invention

The objective of the invention is at the deficiencies in the prior art, and provide a kind of simple in structure, cost is low, reliability is high, the temperature control equipment that is used for plastic injection mould of fully mechanical.

The technical scheme that realizes the object of the invention is:

A kind of temperature control equipment for plastic injection mould, mainly formed by flow regulating unit and driver element, flow regulating unit comprises the threeway mechanism that is made up of valve body and spool, the openings of sizes of two outlets in the threeway mechanism is subjected to the control of valve core rotation angle and is in inversely prroportional relationship, and the adjustable side of spool is fitted with gear; Driver element comprises the cylinder that is provided with heat carrier, and the openend of cylinder is fitted with rack piston; Rack and pinion engagement on the rack piston.

Described driver element also comprises limiting plate, regulates tube and spring, and an end of spring is connected with rack piston, and the other end is arranged on to be regulated in the tube, regulates tube and is spirally connected with limiting plate.

Described flow regulating unit and driver element connect as one by keyset, and the middle part of keyset is provided with the through hole that passes rack piston, and cylinder is packed on the keyset, and keyset and valve body are affixed.

During use, the template of heat carrier and mould closely is abutted against, and the water inlet of threeway mechanism is communicated with cooling water pipe, and an outlet is connected with the cooling duct of mould, and another outlet is connected with water tank or water tower; Be compressed air in the cylinder.

The operation principle of this device is; Heat carrier changes with the variation of mold temperature, impels the pressure of cylinder compressed air to change, and in conjunction with the work of spring in order to driving gear bar reciprocating motion of the pistons; The gear that the rack drives of motion is engaged with rotates, the gear driven spool that rotates rotates synchronously, thereby the openings of sizes of two outlets on the valve body is changed, the flow of cooling water of mould of causing flowing through changes thereupon, the variation of flow causes its heat of taking away also to change thereupon, and mold temperature control is in predetermined scope the most at last.

Advantage of the present invention is:

1, simple in structure, low cost of manufacture, mounting, commissioning and maintenance is all very easy;

2, heat carrier one end is close to the template of mould, directly acts on the compressed air in the cylinder, has reduced intermediate conversion links, and is highly sensitive;

3, full mechanical, without any need for electronic devices and components, the reliability height;

4, the adaptive temperature scope is wide, tightness by regulating spring, can control initial position and the final position of rack piston, thereby adjust the minimum and the maximum secting area that connect the outlet of mould cooling duct, and then control the minimum and maximum flow that enters cooling water in the mould, thereby can set the highest and minimum temperature of mould indirectly.

Description of drawings

Fig. 1 is the overall structure schematic diagram of embodiment;

Fig. 2 is flow regulating unit structural representation among the embodiment;

Fig. 3 is structure of driving unit schematic diagram among the embodiment.

Among the figure, 1. valve body 2. spools 3. cover plates 4. gears 5. limiting plates 6. are regulated tube 7. springs 8. rack pistons 9. keysets 10. cylinders 11. sealing rings 12. heat carriers 13. first outlets 14. second outlets 15. cooling water water inlets.

The specific embodiment

Below in conjunction with drawings and Examples content of the present invention is described in further detail, but is not limitation of the invention.

Embodiment:

With reference to Fig. 1, Fig. 2, Fig. 3, a kind of temperature control equipment for plastic injection mould, mainly formed by flow regulating unit and driver element, flow regulating unit comprises the threeway mechanism that is made up of valve body 1 and spool 2, the openings of sizes of outlet 13 and second outlet 14 of first in the threeway mechanism is subjected to the control of spool 2 rotational angles and is in inversely prroportional relationship, and the adjustable side of spool 2 is fitted with gear 4; Driver element comprises the cylinder 10 that is provided with heat carrier 12, and the openend of cylinder 10 is fitted with rack piston 8; Rack and pinion 4 engagements on the rack piston 8.

Driver element also comprises limiting plate 5, regulates tube 6 and spring 7, and an end of spring 7 is connected with rack piston 8, and the other end is arranged on to be regulated in the tube 6, regulates tube 6 and is spirally connected with limiting plate 5.

Flow regulating unit and driver element connect as one by keyset 9, and the middle part of keyset 9 is provided with through hole, and rack piston 8 passes through hole, and cylinder 10 is packed on the keyset 9, and keyset 9 is affixed with valve body 1.

Spool 2 is arranged in the valve body 1 by cover plate 3, and cover plate 3 is fixed on the valve body 1 by screw, prevents that spool 2 is at the work valve body 1 of the time scurrying out.

Limiting plate 5 is fixed on the cover plate 3 by screw.

In the described threeway mechanism, the upper and lower end face of valve body 1 and two sides are respectively equipped with four through holes that connect mutually, wherein the through hole of upper surface is used for spool 2 equipped, two through holes of two sides and the through hole of lower surface form one can regulate the flow divider of the openings of sizes of two outlets by spool 2, two through holes of two sides are first outlet, 13 and second outlet 14, and the through hole of lower surface is cooling water water inlet 15.

Heat carrier 12 installs by sealing ring 11 and cylinder 10, and to avoid gas leakage, heat carrier 12 is the high metal material of thermal conductivity factor, as fine copper or silver.

Cylinder 10 cylinder bodies and rack piston 8 are the extremely low nonmetallic materials of thermal conductivity factor, as nylon.

Before the use, fill compressed air with in the cylinder 10, adjust the position of regulating tube 6, rack piston 8 drives spool 2 and rotates, the corner of spool 2 is adjusted to first outlet 13 be in standard-sized sheet, second outlet 14 is in closed condition, this device is by screw and plastic injection mould assembling, the template that guarantees heat carrier 12 and mould closely is abutted against, it is good to make it contact, reduces the loss that heat is transmitted, and cooling water water inlet 15 is communicated with cooling water pipe, second outlet 14 is communicated with the cooling duct of mould, first outlet 13 is communicated with water tank or water tower, and at this moment, cooling water all exports 13 and directly get back to water tank through first.

After plastic injection mould injection moulding begins, along with plastic melt constantly enters mould, mold temperature raises, the temperature of heat carrier 12 also raises thereupon synchronously, compressed air in the cylinder 10 also expands thereupon heating up, thereby promote rack piston 8 overcome spring 7 active force and toward moving left, and the gear 4 that driving is engaged with rotates counterclockwise, the gear 4 that rotates drives the spool 2 coaxial with it and also rotates counterclockwise, thereby the openings of sizes of the outlet of first on the valve body 1 13 is progressively diminished, the openings of sizes of second outlet 14 progressively increases, and the result is that cooling water begins to enter the cooling that realizes in the mold cools down passage mould through second outlet 14.Mold temperature raises as continuing, compressed-air actuated pressure is just more big, rack piston 8 just continues toward moving left, gear 4 and spool 2 continue to do and rotate counterclockwise, the openings of sizes of the outlet of first on the valve body 1 13 just openings of sizes more little, second outlet 14 just continues to increase, the flow of the cooling water in the mould that enters is just more big, and the heat that cooling water is taken away from mould is more many, begins to descend until the temperature of mould.

Decline along with mold temperature, the temperature of heat carrier 12 descends thereupon, compressed air in the cylinder 10 is lowered the temperature thereupon, thereby cause the bulbs of pressure to reduce, toward right motion, driven wheel 4 and spool 2 clockwise rotate rack piston 8 under the effect of spring 7, openings of sizes big, second outlet 14 diminishes thereby the openings of sizes that makes first outlet 13 on the valve body 1 becomes, the cooling water flow that causes entering in the mould reduces, and the heat that cooling water is taken away from mould reduces, until the temperature recovery of mould.

Said process dynamically carries out repeatedly, and mold temperature is stabilized within the preset range the most at last.

Claims

1. temperature control equipment that is used for plastic injection mould, mainly formed by flow regulating unit and driver element, it is characterized in that: flow regulating unit comprises the threeway mechanism that is made up of valve body and spool, the openings of sizes of two outlets in the threeway mechanism is subjected to the control of valve core rotation angle and is in inversely prroportional relationship, and the adjustable side of spool is fitted with gear; Driver element comprises the cylinder that is provided with heat carrier, and the openend of cylinder is fitted with rack piston, the rack and pinion engagement on the rack piston; Driver element also comprises limiting plate, regulates tube and spring, and an end of spring is connected with rack piston, and the other end is arranged on to be regulated in the tube, regulates tube and is spirally connected with limiting plate; Flow regulating unit and driver element connect as one by keyset, and the middle part of keyset is provided with the through hole that passes rack piston, and cylinder is packed on the keyset, and keyset and valve body are affixed.