CN201538016U

CN201538016U - Injection cylinder for plastic injection molding machine

Info

Publication number: CN201538016U
Application number: CN 200920199465
Authority: CN
Inventors: 厉永福
Original assignee: Zhejiang Sound Machinery Manufacture Co Ltd
Current assignee: Zhejiang Sound Machinery Manufacture Co Ltd
Priority date: 2009-10-29
Filing date: 2009-10-29
Publication date: 2010-08-04
Anticipated expiration: 2019-10-29

Abstract

The utility model discloses an energy-saving and high-speed injection cylinder with low injection back pressure, which can differentially quickly inject and is driven by dual-cylinder in balance, applicable to a plastic injection molding machine. An injection cylinder finishes injecting and anti-backing in the injection molding machine. The injection cylinder for plastic injection molding machine comprises a piston rod, a front gland, a front guide sleeve, a front cover, an injection seat, a rear cover, a cylinder, an injection seat, a rear guide sleeve, a rear gland, a cover and a nut, which is characterized in that a sliding rode is arranged in the piston rod and fixed with the rear cover by the nut; the center of the sliding rod is opened with an oil hole; the circumference of the rear cover is opened with a through hole. The injection cylinder for plastic injection molding machine has the advantages of saving energy, high injection speed and low injection back pressure.

Description

The injection cylinder that is used for plastic-injection moulding machine

Technical field

The utility model relate to a kind of energy-conservation, at a high speed, low injection back pressure and can realize the injection cylinder that the twin-tub balance of differential fast injection drives, be applicable to plastic-injection moulding machine, injection cylinder is finished in injection (mo(u)lding) machine and is injected and anti-saliva moves.

Background technology

In existing plastic-injection moulding machine technology, the existing method for designing of injection cylinder generally has two kinds, see accompanying drawing 1, accompanying drawing 2 for details, wherein accompanying drawing 1 is the most popular injection cylinder structure of present injection (mo(u)lding) machine, it belongs to the injection cylinder that the twin-tub balance drives, during action of injection, injecting cavity 27 (being the protecgulum hydraulic fluid port) oil-feed, anti-saliva chamber 28 (being the bonnet hydraulic fluid port) oil return; When anti-saliva moves, anti-saliva chamber 28 oil-feeds, injecting cavity 27 oil returns; Mainly in preformed and two actions of injection, we only discuss action of injection to the injector consumed power here, during the twin-tub injection, and injecting cavity 27 oil-feeds, anti-saliva chamber 28 oil returns; Because there is area difference in two chambeies, when injecting cavity 27 flows were Q, anti-saliva chamber 28 flows were QD ²/ (D ²-d ²), wherein: D is cylinder barrel 25 internal diameters, d is piston rod 19 diameters, increase (increase of machine specification) along with the injector injection volume, two cavity areas differ great disparity more, promptly two chamber flows differ bigger, and when injection, anti-saliva chamber 27 hydraulic oil are by valve and pipeline oil sump tank, it is the main cause that causes oily temperature rise, need overcome anti-saliva back lining when promptly injecting and press, system consumption a large amount of idle works, with regard to just present injector (standard) design parameter, injection speed is obviously accelerated, the standard machine has generally reached 180mm/S, and some high speed machine even reached 800mm/S is in order to adapt to high speed injection, accompanying drawing 1 structure injection cylinder must strengthen anti-saliva chamber 28 oil return openings (being the bonnet hydraulic fluid port) size, adapting to when the high speed injection, the anti-quick oil extraction in saliva chamber, in a word, accompanying drawing 1 structure injection cylinder shortcoming is as follows: energy consumption is big, the occasion of incompatibility high speed injection is the main cause that causes the system oil temperature rise, incompatibility existing market form.

Accompanying drawing 2 is modifieds of Fig. 1, mainly is in order to overcome the design defect that above Fig. 1 exists, promptly to increase by an anti-saliva piston rod 29 in anti-saliva chamber 31, and this structure is popular in Ningbo and injector market, Guangdong, when injecting cavity 30 flows are Q, prevents that saliva chamber 31 flows are Q (D ²-d1 ²)/(D ²-d ²), wherein: D is cylinder barrel 32 internal diameters, d is injecting piston rod 33 diameters, d1 is anti-saliva piston rod 29 diameters, because of d1＞d, thus anti-saliva chamber 31 flows less than injecting cavity 30 flows, during injection anti-saliva back lining be pressed with reduce, energy consumption has certain reduction, basic adaptation high speed injection, but following shortcoming is arranged: 1. design not hommization, anti-saliva piston rod 29 and sheath 34 are arranged in 31 designs of anti-saliva chamber, take the equipment assembling and safeguard the space, be unfavorable for the maintenance and the mounting or dismounting of nozzle and barrel heating collar; 2. design cost height; 3. can not thoroughly solve the injection back pressure problems, only make moderate progress.

The utility model content

Technical problem to be solved in the utility model is to overcome deficiency of the prior art and the injection cylinder that is used for plastic-injection moulding machine that a kind of energy efficient, high injection speed, low injection back pressure are provided.

The technical scheme in the invention for solving the above technical problem is: a kind of injection cylinder that is used for plastic-injection moulding machine, comprise piston rod, preceding gland, preceding fairlead, protecgulum, injection seat, bonnet, cylinder barrel, injection seat, back fairlead, rear pressing cover, bonnet, nut, be characterized in: be provided with slide bar in the described piston rod, slide bar and bonnet are fixed by nut, the slide bar center offers oilhole, offers through hole on the described bonnet circumference.

The utility model compared with prior art has the following advantages: the utility model is provided with a slide bar in the piston rod of injection cylinder, it is a little hydraulic jack of plunger type that this slide bar cans be compared to, slide bar and bonnet are fixed by nut, offer oilhole at the slide bar center, piston rod interior oil oil return when being used to inject, on the bonnet circumference, offer through hole, when being used for high speed injection, the right smooth exhaust in chamber of piston rod, because when injecting again, the directly logical atmosphere in the right chamber of piston rod is added piston rod internal hydraulic pressure oil seldom, thereby is reached energy-conservation, high injection speed, the purpose of low injection back pressure.

Description of drawings

Fig. 1 is a prior art A structural representation.

Fig. 2 is a prior art B structural representation.

Fig. 3 is the utility model structural representation.

The specific embodiment

Referring to Fig. 3, the utility model comprises piston rod 3, preceding gland 4, preceding fairlead 5, protecgulum 6, cylinder barrel 7, injection seat 8, slide bar 9, back fairlead 10, rear pressing cover 11, bonnet 12, nut 13.Wherein concrete assembly relation (not containing the seal assembling) is as follows: will back fairlead 10 pack in the piston rod 3, rear pressing cover 11 is installed on the piston rod 3 by screw, in the back fairlead 10 of again slide bar 11 being packed into again; Preceding fairlead 5 and preceding gland 4 are installed on the protecgulum 6 successively, again protecgulum 6 is shown by Fig. 3 and be inserted on the piston rod 3, assembly after above part has been adorned is decided to be assembly one, cylinder barrel 7 is packed in the injection seat 8, the cylinder barrel 7 of again bonnet 12 being packed into, and be fixed on the injection seat 8 by screw, at last assembly one is packed in the cylinder barrel 7, protecgulum 6 is fixed on the injection seat 8 by screw, by nut 13 slide bar is fixed on the bonnet 12, has finished the assembling of injection cylinder.Be provided with slide bar 9 in the described piston rod 3, slide bar 9 is fixing by nut 13 with bonnet 12, and slide bar 9 centers offer oilhole 15, offer through hole 14 on described bonnet 12 circumference.

During injection, system pressure oil promotes piston rod 3 and moves right from injection cylinder injecting cavity I (protecgulum hydraulic fluid port) oil-feed, and establishing protecgulum oil-feed flow is Q, and piston rod 3 right chambeies directly communicate with atmosphere, and at this moment plunger (anti-saliva) cylinder oil return flow is Qd2 ²/ (D ²-d ²), wherein: D is an internal diameter of cylinder, d is a diameter of piston rod, d2 is the slide bar diameter, because of Q＞＞Qd2 ²/ (D ²-d ²), so greatly reduce unnecessary energy consumption during injection, because of preventing that saliva chamber II (slide bar hydraulic fluid port) oil return flow is little, the injection back pressure greatly reduces naturally, for high speed injection provides technical guarantee, if when injection, the oil return of slide bar right-hand member is changed by hydraulic system, is made its hydraulic oil come back to injecting cavity I, just can realize differential fast injection; Slide bar right-hand member when preventing saliva (anti-saliva chamber II) oil-feed promotes piston rod 3 to left movement, and hydraulic oil is by protecgulum 6 (injecting cavity I) oil return.

Claims

1. injection cylinder that is used for plastic-injection moulding machine, comprise piston rod, preceding gland, preceding fairlead, protecgulum, injection seat, bonnet, cylinder barrel, injection seat, back fairlead, rear pressing cover, bonnet, nut, it is characterized in that: be provided with slide bar in the described piston rod, slide bar and bonnet are fixed by nut, the slide bar center offers oilhole, offers through hole on the described bonnet circumference.