阅读说明：本技术 一种零背压注射油路系统 (Zero back pressure injection oil piping system ) 是由 倪德香 张汉丽 薛原洁 刘翔 郑驰 郭维亮 于 2020-05-20 设计创作，主要内容包括：本发明公开了一种零背压注射油路系统,其包括进油线路、回油线路、注射线路、溶胶线路和背压控制线路；溶胶线路包括二位四通阀和双向泵；所述背压控制线路处于T口和回油线路之间；所述背压控制线路用于控制所述注射线路的背压。本发明中,零背压注射油路系统具有背压控制线路；其包括二位四通阀和双向泵；所述二位四通阀包括A口、B口、P口和T口；所述A口与注射伸缩杆中的有杆腔连通；所述P口与进油线路相连；所述B口与双向泵相连；所述T口与回油线路相连；所述背压控制线路处于T口和回油线路之间,通过控制背压线路控制所述注射伸缩杆的背压,避免注射时具有背压而影响产品质量。(The invention discloses a zero-backpressure injection oil way system which comprises an oil inlet line, an oil return line, an injection line, a sol line and a backpressure control line, wherein the oil inlet line is connected with the oil return line; the sol line comprises a two-position four-way valve and a two-way pump; the backpressure control line is positioned between the T port and the oil return line; the back pressure control circuit is used for controlling the back pressure of the injection circuit. In the invention, the zero back pressure injection oil way system is provided with a back pressure control circuit; it comprises a two-position four-way valve and a two-way pump; the two-position four-way valve comprises an A port, a B port, a P port and a T port; the port A is communicated with a rod cavity in the injection telescopic rod; the P port is connected with the oil inlet line; the port B is connected with a bidirectional pump; the T port is connected with an oil return line; the backpressure control circuit is in between T mouth and the oil return circuit, through control backpressure circuit control the backpressure of injection telescopic link has the backpressure and influences product quality when avoiding injecting.)

1. A zero back pressure injection oil circuit system, comprising:

an oil inlet line;

an oil return line;

an injection line; the device comprises a first three-position four-way valve and at least one injection telescopic cylinder, wherein the first three-position four-way valve is used for controlling the expansion, contraction and stop of the injection telescopic cylinder; the oil injection line is fed with oil through the oil inlet line and is fed with oil through the oil return line;

a glue melting circuit; the hydraulic control system comprises a two-position four-way valve and a hydraulic motor; the two-position four-way valve comprises an A port, a B port, a P port and a T port; the port A is communicated with a rod cavity in the injection telescopic rod; the port P is connected with the oil inlet line; the port B is connected with a hydraulic motor; the T port is connected with the oil return line;

the backpressure control circuit is arranged between the T port and the oil return circuit.

2. The zero back pressure injection oil circuit system of claim 1, wherein: the backpressure control circuit comprises a cartridge valve and a cartridge valve opening control circuit, the cartridge valve is connected with a T opening and an oil return circuit of the two-position four-way valve, and the cartridge valve opening control circuit controls the opening of the cartridge valve.

3. The zero back pressure injection oil circuit system of claim 2, wherein: the cartridge valve comprises a first port, a second port and a control port, the first port is connected with a T port in the two-position four-way valve, and the second port is connected with the oil return line; the control opening is connected with the opening control circuit of the cartridge valve.

4. The zero back pressure injection oil circuit system of claim 3, wherein: the cartridge valve opening control circuit comprises a two-position two-way valve and a pressure control valve, and the two-position two-way valve is connected with the pressure control valve in parallel.

5. The zero back pressure injection oil circuit system of claim 3, wherein: and a pressure gauge is arranged between the T port of the two-position four-way valve and the first port.

6. The zero back pressure injection oil circuit system of claim 1, wherein: the device also comprises a launching and moving line which comprises a second three-position four-way valve and at least one launching and moving telescopic cylinder, wherein the second three-position four-way valve is used for controlling the stretching, contraction and stop of the launching and moving telescopic cylinder; the injection shifting line is fed with oil through the oil inlet line and is returned with oil through the oil return line.

7. The zero back pressure injection oil circuit system of claim 1, wherein: the number of the injection telescopic cylinders is two, and the two injection telescopic cylinders are connected in parallel.

Technical Field

The invention relates to the technical field of hydraulic oil ways, in particular to a zero-backpressure injection oil way system.

Background

At present, because the equipment characteristic of vertical injection molding machine, the screw rod of injection molding machine is the overall arrangement of vertical direction generally, vertical overall arrangement is because the screw rod, the rotatory oil pressure motor of drive screw, the dead weight effect of parts such as oil pressure motor seat and transmission shaft, fused plastic can bear great pressure (also called backpressure) during the storage, especially the better nylon of mobility, plastics such as POM, the plastic can spill over from the feed inlet of nozzle mouth or mould machine mouth when the storage, lead to the mould debugging extremely unsmooth, the production efficiency is reduced, still cause the very big waste of raw and other materials simultaneously, the production cost is increased, still influence product quality.

Disclosure of Invention

To the above-mentioned not enough of prior art, provide a zero back pressure injection oil piping system, there is the problem of backpressure when solving injection molding machine injection.

The technical scheme adopted by the invention for solving the technical problems is a zero back pressure injection oil way system, which comprises:

an oil inlet line;

an oil return line;

an injection line; the device comprises a first three-position four-way valve and at least one injection telescopic cylinder, wherein the first three-position four-way valve is used for controlling the expansion, contraction and stop of the injection telescopic cylinder; the oil injection line is fed with oil through the oil inlet line and is fed with oil through the oil return line;

a glue melting circuit; the hydraulic control system comprises a two-position four-way valve and a hydraulic motor; the two-position four-way valve comprises an A port, a B port, a P port and a T port; the port A is communicated with a rod cavity in the injection telescopic rod; the port P is connected with the oil inlet line; the port B is connected with a hydraulic motor; the T port is connected with the oil return line;

and the backpressure control circuit is positioned between the T port of the two-position four-way valve and the oil return circuit.

Preferably, the backpressure control circuit comprises a cartridge valve and a cartridge valve opening control circuit, the cartridge valve is connected with a T opening and an oil return circuit of the two-position four-way valve, and the cartridge valve opening control circuit controls the opening of the cartridge valve.

Preferably, the cartridge valve comprises a first port, a second port and a control port, the first port is connected with a T port of the two-position four-way valve, and the second port is connected with the oil return line; the control opening is connected with the opening control circuit of the cartridge valve.

Preferably, the cartridge valve opening control circuit comprises a two-position two-way valve and a pressure control valve, and the two-position two-way valve is connected with the pressure control valve in parallel.

Preferably, a pressure gauge is arranged between the T port and the first through port.

Preferably, the device also comprises a shooting and moving line which comprises a second three-position four-way valve and at least one shooting and moving telescopic cylinder, wherein the second three-position four-way valve is used for controlling the stretching, the contraction and the stop of the shooting and moving telescopic cylinder; the injection shifting line is fed with oil through the oil inlet line and is returned with oil through the oil return line.

Preferably, the number of the injection telescopic cylinders is two, and the two injection telescopic cylinders are connected in parallel.

In the invention, the zero back pressure injection oil way system is provided with a back pressure control circuit; the hydraulic control system comprises a two-position four-way valve and a hydraulic motor; the two-position four-way valve comprises an A port, a B port, a P port and a T port; the port A is communicated with a rod cavity in the injection telescopic rod; the P port is connected with the oil inlet line; the port B is connected with a hydraulic motor; the T port is connected with an oil return line; the backpressure control circuit is in between T mouth and the oil return circuit, through control backpressure circuit control the backpressure of injection telescopic link has the backpressure and influences product quality when avoiding injecting.

Drawings

FIG. 1 is a schematic diagram of an exemplary zero back pressure injection system.

100, feeding oil into a line; 200. an oil return line; 300. an injection line; 310. a first three-position four-way valve; 320. an injection telescopic cylinder; 400. a glue melting circuit; 410. a two-position four-way valve; 420. a hydraulic motor; 500. a backpressure control circuit; 510. a cartridge valve; 511. a first port; 512. a second port; 513. a control port; 520. a two-position two-way valve; 530. a pressure control valve; 600. a pressure gauge; 700. shooting and moving the line; 710. a second three-position four-way valve; 720. and (4) ejecting and moving the telescopic cylinder.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Referring to fig. 1, the present invention discloses a zero back pressure injection oil circuit system, which includes an oil inlet line 100, an oil return line 200, an injection line 300, a glue melting line 400 and a back pressure control line 500;

the injection line 300 comprises a first three-position four-way valve 310 and at least one injection telescopic cylinder 320, wherein the first three-position four-way valve 310 is used for controlling the expansion, contraction and stop of the injection telescopic cylinder 320; the injection line 300 is fed with oil through the oil feeding line 100, and is fed with oil through the oil return line 200.

The injection line 300 is used for performing an injection action of the injection molding machine, pressure oil from the oil inlet line 100 passes through the first three-position four-way valve 310 and then enters a rod cavity in the injection telescopic cylinder 320, and pressure oil in a rodless cavity in the injection telescopic cylinder 320 returns to the oil return line 200 through the first three-position four-way valve 310: the releasing and withdrawing actions of the injection telescopic cylinder 320 are realized, the first three-position four-way valve 310 is reversed, so that the pressure oil is fed into a rodless cavity in the injection telescopic cylinder 320 from the oil feeding line 100 through the first three-position four-way valve 310, and the pressure oil in a rod cavity in the injection telescopic cylinder 320 returns to the oil return line 200 through the first three-position four-way valve 310.

The glue melting line 400 comprises a two-position four-way valve 410 and a hydraulic motor 420; the two-position four-way valve 410 comprises an A port, a B port, a P port and a T port; the port A is communicated with a rod cavity in the injection telescopic rod; the P port is connected to the oil inlet line 100; the port B is connected with a hydraulic motor 420; the T port of the two-position two-way valve 410 is connected with the oil return line 200;

in the glue melting process, pressure oil in the oil inlet line 100 enters the hydraulic motor 420 through the two-position four-way valve 410, and the pressure oil in the hydraulic motor 420 returns to the oil return line 200; at the same time, the oil in the rod chamber of the telescopic injection cylinder 320 can be released through the two-position four-way valve 410 to the oil return line 200.

The back pressure control circuit is that an independent oil return tank is arranged between the T port of the two-position four-way valve and the oil return line 200, the back pressure control circuit completely discharges upper cavity pressure oil of the cartridge valve 510 through the two-position two-way valve 520, and the pressure in the injection telescopic cylinder 320 is zero.

The back pressure control circuit 500 comprises a cartridge valve 510 and a cartridge valve opening control circuit, the cartridge valve 510 is connected with the T port of the two-position four-way valve 410 and the oil return circuit 200, and the cartridge valve 510 opening control circuit controls the opening of the cartridge valve 510.

Particularly, can regulate and control through back pressure control circuit 500 backpressure in the injection telescopic link, the regulation and control of cartridge valve opening control circuit the opening of cartridge valve 510 works as when the opening of cartridge valve 510 is less, pressure oil in the injection telescopic cylinder 320 can't be released completely, and at this moment, the injection telescopic link can have the backpressure, and solenoid valve 520 is electrified, and cartridge valve opening control circuit will the opening of cartridge valve 510 is adjusted to enough big, makes the pressure oil of injection telescopic link is whole to be released, can let no backpressure in the injection telescopic link.

The cartridge valve 510 comprises a first port 511, a second port 512 and a control port 513, wherein the first port 511 is connected with a port T of the two-position four-way valve, and the second port 512 is connected with the oil return line 200; the control port 513 is connected with the cartridge valve opening control line, and the opening control line of the cartridge valve 510 controls the opening of the cartridge valve 510 through the control port 513.

The cartridge valve opening control circuit comprises a two-position two-way valve 520 and a pressure control valve 530, wherein the two-position two-way valve 520 is connected with the pressure control valve 530 in parallel.

Specifically, the two-position two-way valve 520 can be switched to adjust and control the injection telescopic cylinder 320 to have back pressure and not to have back pressure; when the two-position two-way valve 520 is de-energized, the pressure oil in the control port 513 in the cartridge valve 510 cannot return to the oil tank from the two-position two-way valve 520, the pressure control valve 530 has pressure, at this time, the opening degree of the cartridge valve 510 is smaller, the pressure control valve 530 controls the pressure oil passing through the cartridge valve 510 by controlling the opening degree of the cartridge valve 510, the telescopic injection cylinder 320 has back pressure, the pressure in the rod cavity in the telescopic injection rod returns to the oil return line 200 through the first port 511 and the second port 512 of the cartridge valve 510, when the two-position two-way valve 520 is energized, the pressure oil in the control port 513 returns to the oil tank through the two-position two-way valve 520, at this time, the opening degree of the cartridge valve 510 is larger, the pressure control valve 530 cannot influence the pressure oil passing through the cartridge valve 510, the pressure oil in the telescopic injection cylinder 320 returns to the oil return line 200 through the first port 511 and the second port 512 of the, at this point, the injector-expansion cylinder 320 is not back-pressurized.

A pressure gauge 600 is arranged between the T port and the first through port 511.

The zero back pressure injection oil path system further comprises a jet shift line 700 which comprises a second three-position four-way valve 710 and at least one jet shift telescopic cylinder 720, wherein the second three-position four-way valve 710 is used for controlling the extension, contraction and stop of the jet shift telescopic cylinder 720; the injection and displacement line 700 is fed with oil through the oil inlet line 100 and is fed with oil through the oil return line 200.

The number of the injection telescopic cylinders 320 is two, and the two injection telescopic cylinders 320 are connected in parallel.

The invention discloses a zero back pressure injection oil way system, which is provided with a melt adhesive line 400 and a back pressure control line 500; the melt glue line 400 includes a two-position four-way valve 410 and a hydraulic motor 420; the two-position four-way valve 410 comprises an A port, a B port, a P port and a T port; the port A is communicated with a rod cavity in the injection telescopic rod; the port P is connected to an oil inlet line 100; the port B is connected with a hydraulic motor 420; the T port is connected with an oil return line 200; backpressure control circuit 500 is located between T mouth and the oil return circuit 200, through control backpressure circuit control the backpressure of injection telescopic link has the backpressure and influences product quality when avoiding injecting.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.