CN215791541U - Power system for injection mechanism of injection molding machine - Google Patents

Abstract

The utility model discloses a power system for an injection mechanism of an injection molding machine, which is characterized by comprising a high-speed mechanism and a high-pressure mechanism, wherein the high-speed mechanism and the high-pressure mechanism can work independently and are used for realizing the mutual switching of a high-speed low-pressure propulsion mode at the front injection section and a high-pressure low-speed pressure maintaining mode at the rear injection section. The advantage is that driving system comprises but high-speed mechanism and the high-pressure mechanism of independent work, adopts two independent mechanisms to be used for realizing the propulsion mode of the high-speed low pressure of injection anterior segment and the pressurize mode of the high pressure low speed of injection back end respectively and switches over each other, and simple structure satisfies the user demand, and the cost is lower, and even mechanism independent work, control accuracy is also better.

Description

Power system for injection mechanism of injection molding machine

Technical Field

The utility model relates to an injection molding machine, in particular to a power system for an injection mechanism of the injection molding machine.

Background

An injection molding machine is a commonly used molding machine, and mainly comprises an injection system, a mold clamping system, a driving system and a control system, wherein the systems are matched with each other to complete the molding of a product. The injection mechanism is an important component of an injection system, the injection power of the injection system is mainly provided by an injection oil cylinder at present, the injection oil cylinder provides a thrust force for an injection screw rod or a push rod to drive the injection screw rod or the push rod to move so as to push injection slurry into a mold cavity, in order to ensure the molding quality of a product, a rapid thrust force is generally required to be provided at the front stage of injection so as to prevent the injection slurry from cooling, and a high pressure is required to be provided to maintain pressure at the rear stage of injection when the mold cavity is about to be filled or is filled, so as to reduce the shrinkage of the product. The maximum system pressure high speed and the maximum system pressure high pressure of a power system of an injection mechanism of the traditional injection molding machine are generally the same at present, the area of a piston of an oil cylinder is designed according to the high pressure, the thrust is small when the actual working condition is high speed in the injection process, and the large thrust is needed only when the high pressure is maintained.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a power system for an injection mechanism of an injection molding machine, which has a simple structure, lower cost and better control precision on the premise of meeting the requirements of front-section high-speed injection and rear-section high-pressure maintaining.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

a power system for an injection mechanism of an injection molding machine comprises a high-speed mechanism and a high-pressure mechanism, wherein the high-speed mechanism and the high-pressure mechanism can work independently and are used for realizing the mutual switching of a high-speed low-pressure propulsion mode at the front injection section and a high-pressure low-speed pressure maintaining mode at the rear injection section.

The high-speed mechanism be injection cylinder, injection cylinder include that inside has an injection cylinder body of inner chamber, the inner chamber in can be provided with the piston around the activity, the piston will the inner chamber divide for preceding cavity and back cavity, the injection cylinder body on correspond preceding cavity with the back cavity the position on be provided with respectively with the inner chamber be linked together first hydraulic fluid port and second hydraulic fluid port, the piston on coaxial coupling have a piston rod, the front end of piston rod stretch out forward the inner chamber with penetrate the coaxial fixed connection of screw rod or push rod on the mechanism.

The high-pressure mechanism be pressure boost hydro-cylinder, pressure boost hydro-cylinder including installing the pressure boost cylinder body of injection cylinder body rear end, pressure boost cylinder body in have a pressure boost chamber, the pressure boost intracavity be provided with pressure boost piston around can moving about, pressure boost piston will pressure boost chamber divide for preceding pressure boost cavity and back pressure boost cavity, pressure boost cylinder body on correspond preceding pressure boost cavity with back pressure boost cavity the position on be provided with respectively with the third hydraulic fluid port and the fourth hydraulic fluid port that are linked together of pressure boost chamber, pressure boost piston on the coaxial coupling have a pressure boost piston rod, pressure boost piston rod's front end stretch out forward pressure boost chamber stretch into the setting and be in back cavity in.

The longitudinal sectional area of the pressurizing piston is larger than that of the pressurizing piston rod, and the longitudinal sectional area of the pressurizing cavity is larger than that of the inner cavity.

The high-speed mechanism is an injection oil cylinder, the high-pressure mechanism is a pressurizing oil cylinder, the longitudinal sectional area of the pressurizing piston is larger than that of the pressurizing piston rod in a matching mode through combination of the two oil cylinders, the longitudinal sectional area of the pressurizing cavity is larger than that of the inner cavity, the area of the inner cavity is small, the required flow is small, high-speed and low-pressure can be achieved, and the pressurizing cavity and the inner cavity are matched together and used for achieving high-pressure and low-speed. And the injection oil cylinder acts, the injection screw or the push rod is driven to advance in a high-speed low-pressure advancing mode through oil feeding of the second oil port, the slurry to be injected in the injection cylinder in the injection mechanism is injected into the mold cavity through the injection nozzle on the injection cylinder, when the mold cavity is about to be filled or is filled, the first oil port stops oil feeding, the pressurizing oil cylinder acts, the injection screw or the push rod is controlled to continue to advance in the high-pressure low-speed advancing mode through oil feeding of the fourth oil port, the slurry to be injected is continuously pushed into the mold cavity, and a pressure maintaining state is achieved so as to reduce the contraction of a product. The switching of the two propulsion modes of high-speed low-pressure propulsion and low-speed high-pressure propulsion of the injection screw or the push rod is realized, the flow of hydraulic oil of the system can be smaller compared with that of the traditional structure at a high speed, the injection screw or the push rod is mainly operated through the injection oil cylinder during injection, the high-speed low pressure provides a quick propulsion force for the injection screw or the push rod so as to avoid cooling of mixed materials, and in a pressure maintaining stage, the high-pressure low speed is realized through oil feeding of the pressurization oil cylinder so as to reduce the shrinkage of products.

The high-pressure mechanism comprises a low-pressure energy accumulator and a high-pressure energy accumulator, the low-pressure energy accumulator and the high-pressure energy accumulator are filled with hydraulic oil, the low-pressure energy accumulator is communicated with the second oil port through a first servo valve, the high-pressure energy accumulator is communicated with the first oil port through a second servo valve, the low-pressure energy accumulator is driven by a low-pressure power unit, and the high-pressure energy accumulator is driven by a high-pressure power unit. The injection device has the advantages of simple structure and low failure rate, the effect of high-speed injection can be achieved only by a small power output unit, and the two energy accumulators are controlled by the servo valve, so that the injection precision can be effectively improved. The injection front section supplies oil to the second oil port through the low-pressure energy accumulator, the pressure and the speed of the oil supply of the low-pressure energy accumulator are controlled through the first servo valve, the injection screw or the push rod is driven to advance in a high-speed low-pressure propulsion mode, the slurry to be injected in the injection cylinder in the injection mechanism is injected into the mold cavity through the injection nozzle on the injection cylinder, when the mold cavity is about to be filled or is filled, the oil is supplied to the second oil port through the high-pressure energy accumulator, the pressure and the speed of the oil supply of the high-pressure energy accumulator are controlled through the second servo valve, the injection screw or the push rod is controlled to continue to advance in the high-pressure low-speed propulsion mode, the slurry to be injected is continuously pushed into the mold cavity, and the pressure maintaining state is achieved, so that the product shrinkage is reduced.

The high-speed mechanism is an injection oil cylinder, the high-pressure mechanism mainly comprises a low-pressure energy accumulator and a high-pressure energy accumulator which are filled with hydraulic oil, the structure is simple, only one oil cylinder is provided, the installation and processing requirements on the oil cylinder are relatively reduced, the material cost can be reduced, and the length of the whole equipment can be effectively reduced when the high-speed mechanism is applied to an injection molding machine; the high-pressure mechanism formed by the low-pressure energy accumulator and the high-pressure energy accumulator can effectively reduce the efficiency loss rate of the two modes in the conversion process, and meanwhile, the response time is faster, and the pressure connection is better; the oil cylinder has a relatively simple structure, the failure rate is reduced, and the service life is longer.

Compared with the prior art, the utility model has the advantages that: the power system is composed of a high-speed mechanism and a high-pressure mechanism which can work independently, two independent mechanisms are adopted to realize the mutual switching of a high-speed low-pressure propulsion mode at the front injection section and a high-pressure low-speed pressure maintaining mode at the rear injection section, the structure is simple, the use requirement is met, the cost is low, the mechanisms work independently, and the control precision is also good.

Drawings

FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a second embodiment of the present invention.

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

The first embodiment is as follows: as shown in fig. 1, a power system for an injection mechanism of an injection molding machine includes a high-speed mechanism and a high-pressure mechanism, which can work independently to switch between a high-speed low-pressure propulsion mode at a front stage of injection and a high-pressure low-speed pressure maintaining mode at a rear stage of injection.

In this embodiment, the high-speed mechanism is an injection cylinder, the injection cylinder includes an injection cylinder body 5 having an inner cavity therein, a piston 52 is movably disposed in the inner cavity back and forth, the piston 52 divides the inner cavity into a front cavity 501 and a rear cavity 502, a first oil port 53 and a second oil port 54 communicated with the inner cavity are respectively disposed at positions on the injection cylinder body 5 corresponding to the front cavity 501 and the rear cavity 502, a piston rod 55 is coaxially connected to the piston 52, and a front end of the piston rod 55 extends forward out of the inner cavity and is coaxially and fixedly connected to a screw or a push rod on the injection mechanism.

In this embodiment, the high-pressure mechanism is a pressurization cylinder, the pressurization cylinder includes a pressurization cylinder body 6 installed at the rear end of the injection cylinder body 5, a pressurization cavity is provided in the pressurization cylinder body 6, a pressurization piston 62 is movably provided in the pressurization cavity back and forth, the pressurization cavity is divided into a front pressurization cavity 601 and a rear pressurization cavity 602 by the pressurization piston 62, a third oil port 63 and a fourth oil port 64 communicated with the pressurization cavity are respectively provided at positions on the pressurization cylinder body 6 corresponding to the front pressurization cavity 601 and the rear pressurization cavity 602, a pressurization piston rod 65 is coaxially connected to the pressurization piston 62, and the front end of the pressurization piston rod 65 extends forwards out of the pressurization cavity and extends into the rear cavity 502;

in this embodiment, the longitudinal sectional area of the booster piston 62 is larger than the longitudinal sectional area of the booster piston rod 65, and the longitudinal sectional area of the booster chamber 61 is larger than the longitudinal sectional area of the inner chamber 51.

Example two: as shown in fig. 2, the other parts are the same as the first embodiment, except that the high-pressure mechanism includes a low-pressure accumulator 81 and a high-pressure accumulator 82 filled with hydraulic oil, the low-pressure accumulator 81 is communicated with the second oil port 54 through a first servo valve 83, the high-pressure accumulator 82 is communicated with the first oil port 53 through a second servo valve 84, the low-pressure accumulator 81 is driven by a low-pressure power unit, and the high-pressure accumulator 82 is driven by a high-pressure power unit.

Claims (5)

1. A power system for an injection mechanism of an injection molding machine is characterized by comprising a high-speed mechanism and a high-pressure mechanism, wherein the high-speed mechanism and the high-pressure mechanism can work independently and are used for realizing the mutual switching of a high-speed low-pressure propulsion mode at the front injection section and a high-pressure low-speed pressure maintaining mode at the rear injection section.

2. The power system for the injection mechanism of the injection molding machine according to claim 1, wherein the high-speed mechanism is an injection cylinder, the injection cylinder comprises an injection cylinder body having an inner cavity therein, a piston is movably disposed in the inner cavity back and forth, the piston divides the inner cavity into a front chamber and a rear chamber, a first oil port and a second oil port communicated with the inner cavity are respectively disposed at positions on the injection cylinder body corresponding to the front chamber and the rear chamber, a piston rod is coaxially connected to the piston, and the front end of the piston rod extends forward out of the inner cavity and is coaxially and fixedly connected to a screw or a push rod on the injection mechanism.

3. The power system for the injection mechanism of the injection molding machine according to claim 2, wherein the high pressure mechanism is a pressurizing cylinder, the pressurizing cylinder comprises a pressurizing cylinder body installed at the rear end of the injection cylinder body, a pressurizing cavity is formed in the pressurizing cylinder body, a pressurizing piston is movably arranged in the pressurizing cavity back and forth, the pressurizing piston divides the pressurizing cavity into a front pressurizing cavity and a rear pressurizing cavity, a third oil port and a fourth oil port communicated with the pressurizing cavity are respectively arranged on the pressurizing cylinder body corresponding to the front pressurizing cavity and the rear pressurizing cavity, a pressurizing piston rod is coaxially connected to the pressurizing piston rod, and the front end of the pressurizing piston rod extends forwards out of the pressurizing cavity and extends into the rear cavity.

4. A power system for an injection mechanism of an injection molding machine as claimed in claim 3, wherein a longitudinal sectional area of said booster piston is larger than a longitudinal sectional area of said booster piston rod, and a longitudinal sectional area of said booster chamber is larger than a longitudinal sectional area of said inner chamber.

5. The power system for an injection mechanism of an injection molding machine according to claim 2, wherein the high pressure mechanism includes a low pressure accumulator and a high pressure accumulator filled with hydraulic oil, the low pressure accumulator is communicated with the second oil port through a first servo valve, the high pressure accumulator is communicated with the first oil port through a second servo valve, the low pressure accumulator is driven by a low pressure power unit, and the high pressure accumulator is driven by a high pressure power unit.

Images