Flow system hydraulic control oil way for injection molding machine

Abstract

The utility model relates to the technical field of injection molding machines, and particularly discloses a flow system hydraulic control oil way for an injection molding machine, which comprises a motor, a first hydraulic pump, a second hydraulic pump, a first overflow valve, a second overflow valve and a first oil tank, the first overflow valve is communicated with an oil outlet of the first hydraulic pump, the second overflow valve is communicated with an oil outlet of the second hydraulic pump, the second overflow valve is an electromagnetic overflow valve, an electromagnet is arranged on the electromagnetic overflow valve, the electromagnetic overflow valve is opened when the electromagnet is electrified, and the electromagnet can be controlled to be electrified when the injection molding machine is under the working conditions of high pressure and small flow; at the moment, the motor drives the first hydraulic pump and the second hydraulic pump to act simultaneously, the first hydraulic pump normally conveys hydraulic oil to the injection molding machine, at the moment, due to the fact that the electromagnetic overflow valve is opened, the hydraulic oil output by the second hydraulic pump flows out through the electromagnetic overflow valve, force needed by the second hydraulic pump is small, and cost can be saved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to a hydraulic control oil circuit of a flow system for an injection molding machine. Background Art

[0002] With the continuous development of the injection molding machine industry, most injection molding machines currently use servo energy-saving motor groups. However, when the injection molding machine has a large hydraulic flow demand, one motor will be used to drive two oil pumps to achieve large flow delivery. The hydraulic control oil circuit is as follows: Figure 1 As shown, it includes a motor 1, a first hydraulic pump 2, a second hydraulic pump 3, a first overflow valve 4 and a second overflow valve 5. The first hydraulic pump 2 and the second hydraulic pump 3 are respectively connected to the two ends of the output shaft of the motor 1, and the oil outlets of the first hydraulic pump 2 and the second hydraulic pump 3 are both connected to the oil inlet of the injection molding machine, and the first overflow valve 4 is installed at the oil outlet of the first hydraulic pump 2, and the second overflow valve 5 is installed at the oil outlet of the second hydraulic pump 3. When working, the flow of the two pumps is superimposed, which can provide the required flow for the injection molding machine.

[0003] However, when the injection molding machine requires a smaller flow rate, the hydraulic oil is still transported through a double pump, which will cause waste, increase costs and poor applicability. Summary of the invention

[0004] The present invention is made in consideration of the above-mentioned problems, and the purpose of the present invention is to provide a hydraulic control oil circuit of a flow system for an injection molding machine, which can meet the needs of both large and small flow rates and can save costs.

[0005] To achieve the above-mentioned purpose, the utility model provides a flow system hydraulic control oil circuit for an injection molding machine, comprising a motor, a first hydraulic pump, a second hydraulic pump, a first relief valve, a second relief valve and a first oil tank, wherein the first hydraulic pump and the second hydraulic pump are both connected to the output shaft of the motor, and the oil inlets of the first hydraulic pump and the second hydraulic pump are both connected to the first oil tank, and the oil outlets of the first hydraulic pump and the second hydraulic pump are both connected to the oil inlet of the injection molding machine;

[0006] The first overflow valve is connected to the oil outlet of the first hydraulic pump, the second overflow valve is connected to the oil outlet of the second hydraulic pump, and the second overflow valve is configured as an electromagnetic overflow valve, an electromagnet is provided on the electromagnetic overflow valve, when the electromagnet is energized, the electromagnetic overflow valve opens, and when the electromagnet loses power, the electromagnetic overflow valve closes.

[0007] According to the above-mentioned hydraulic control oil circuit of the flow system for an injection molding machine, it also includes a first one-way valve, which is located between the second hydraulic pump and the injection molding machine and faces the oil inlet of the injection molding machine;

[0008] The oil inlet of the first one-way valve is communicated with the oil outlet of the second hydraulic pump, and the oil outlet of the first one-way valve is communicated with the oil inlet of the second hydraulic pump.

[0009] According to the above-mentioned hydraulic control oil circuit of the flow system for an injection molding machine, it also includes a first pressure gauge and a second pressure gauge. The first pressure gauge is located between the first one-way valve and the oil inlet of the injection molding machine, and the second pressure gauge is located between the first one-way valve and the oil outlet of the second hydraulic pump.

[0010] According to the above-mentioned hydraulic control oil circuit of the flow system for an injection molding machine, it also includes a second one-way valve and a second oil tank, the oil inlet of the second one-way valve is connected to the oil outlet of the second oil tank, and the oil outlet of the second one-way valve is connected to the oil inlet of the second hydraulic pump.

[0011] According to the above-mentioned hydraulic control oil circuit of the flow system for an injection molding machine, it also includes a first filter and a second filter. The first filter is located in the first oil tank and connected to the oil inlet of the first hydraulic pump. The second filter is located in the first oil tank and connected to the oil inlet of the second hydraulic pump.

[0012] The utility model has the following beneficial effects: the second overflow valve is set as an electromagnetic overflow valve, when the injection molding machine needs a small flow of hydraulic oil, the electromagnet of the electromagnetic overflow valve is energized, the electromagnetic overflow valve is opened, and the hydraulic oil extracted by the second hydraulic pump will flow out through the electromagnetic overflow valve, so that the output of the second hydraulic pump can be reduced, and the normal output of the first hydraulic pump can be guaranteed, which can reduce the cost; at the same time, when the injection molding machine needs a large flow of hydraulic oil, the electromagnet of the electromagnetic overflow valve is energized, and the electromagnetic overflow valve is closed, and the first hydraulic pump and the second hydraulic pump work normally at the same time, which can meet the large flow demand of the injection molding machine and has good applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the control oil circuit of the prior art;

[0014] Figure 2 Schematic diagram of the control oil circuit of this embodiment.

[0015] In the figure:

[0016] 1. Motor; 2. First hydraulic pump; 3. Second hydraulic pump; 4. First overflow valve; 5. Second overflow valve; 6. Electromagnet; 7. First check valve; 8. First pressure gauge; 9. Second pressure gauge; 10. Second check valve; 11. Second oil tank; 12. First filter; 13. Second filter. DETAILED DESCRIPTION

[0017] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0018] like Figure 2 As shown, a flow system hydraulic control oil circuit for an injection molding machine includes a motor 1, a first hydraulic pump 2, a second hydraulic pump 3, a first relief valve 4, a second relief valve 5 and a first oil tank. The first hydraulic pump 2 and the second hydraulic pump 3 are both connected to the output shaft of the motor 1, and the oil inlets of the first hydraulic pump 2 and the second hydraulic pump 3 are both connected to the first oil tank, and the oil outlets of the first hydraulic pump 2 and the second hydraulic pump 3 are both connected to the oil inlet of the injection molding machine, the first relief valve 4 is connected to the oil outlet of the first hydraulic pump 2, the second relief valve 5 is connected to the oil outlet of the second hydraulic pump 3, and the second relief valve 5 is set to be electric Magnetic overflow valve, an electromagnet 6 is provided on the electromagnetic overflow valve. When the electromagnet 6 is energized, the electromagnetic overflow valve opens. When the electromagnet 6 loses power, the electromagnetic overflow valve closes. When the injection molding machine requires high pressure and small flow, the electromagnet 6 can be controlled to be energized. At this time, the motor 1 drives the first hydraulic pump 2 and the second hydraulic pump 3 to operate at the same time. The first hydraulic pump 2 normally delivers hydraulic oil to the injection molding machine. At this time, since the electromagnetic overflow valve is open, the hydraulic oil output by the second hydraulic pump 3 will flow out through the electromagnetic overflow valve. Since there is no reaction force, the second hydraulic pump 3 requires less force at this time, which can save costs.

[0019] In this embodiment, when the injection molding machine requires a low pressure and a high flow rate, the electromagnet 6 can be controlled to lose power. At this time, the electromagnetic overflow valve is closed, which plays the same role as the first overflow valve 4, and both provide safety protection. At this time, the motor 1 drives the first hydraulic pump 2 and the second hydraulic pump 3 to operate at the same time, and the hydraulic oil output by the first hydraulic pump 2 and the second hydraulic pump 3 are both delivered to the injection molding machine to provide it with a larger flow of hydraulic oil.

[0020] In order to prevent the hydraulic oil in the injection molding machine from flowing back into the second hydraulic pump 3 under high pressure and low flow conditions, a first one-way valve 7 is also included. The first one-way valve 7 is located between the second hydraulic pump 3 and the injection molding machine and faces the oil inlet of the injection molding machine. The oil inlet of the first one-way valve 7 is connected to the oil outlet of the second hydraulic pump 3, and the oil outlet of the first one-way valve 7 is connected to the oil inlet of the second hydraulic pump 3. The pressure oil in the injection molding machine cannot enter the second hydraulic pump 3 through the first one-way valve 7.

[0021] In order to monitor the pressure on both sides of the one-way valve, a first pressure gauge 8 and a second pressure gauge 9 are also included. The first pressure gauge 8 is located between the first one-way valve 7 and the oil inlet of the injection molding machine, and the second pressure gauge 9 is located between the first one-way valve 7 and the oil outlet of the second hydraulic pump 3. The first pressure gauge 8 can monitor the pressure value at the oil inlet of the injection molding machine to avoid excessive pressure, and the second pressure gauge 9 can monitor the pressure value at the oil outlet of the second hydraulic pump 3, so as to intuitively judge whether the oil pressure exceeds the safety threshold.

[0022] Under high pressure and low flow conditions, if the injection molding machine needs to relieve pressure, the motor 1 needs to drive the first hydraulic pump 2. Due to the structure of the double-head pump, the second hydraulic pump 3 will also be driven to flip, and a vacuum will appear at its pump port. In order to replenish oil for the second hydraulic pump 3, a second one-way valve 10 and a second oil tank 11 are also included. The oil inlet of the second one-way valve 10 is connected to the oil outlet of the second oil tank 11. When the pressure is relieved, the second one-way valve 10 can be opened, and the hydraulic oil in the second oil tank 11 can replenish the second hydraulic pump 3 through the second one-way valve 10. At the same time, the oil outlet of the electromagnetic overflow valve is connected to the oil inlet of the second oil tank 11, and the hydraulic oil flowing out of the electromagnetic overflow valve can return to the second oil tank 11.

[0023] In order to improve the service life of the first hydraulic pump 2 and the second hydraulic pump 3, a first filter 12 and a second filter 13 are also included. The first filter 12 is located in the first oil tank and connected to the oil inlet of the first hydraulic pump 2. The second filter 13 is located in the first oil tank and connected to the oil inlet of the second hydraulic pump 3. That is, the hydraulic oil extracted by the first hydraulic pump 2 and the second hydraulic pump 3 are all filtered to prevent large-diameter impurities from entering the first hydraulic pump 2 and the second hydraulic pump 3.

[0024] The technical solution of the utility model is described in detail above in conjunction with the accompanying drawings, and the described embodiments are used to help understand the idea of ​​the utility model. The specific embodiments described herein are merely examples of the spirit of the utility model. A person skilled in the art of the utility model may make various modifications or supplements to the described specific embodiments or replace them in a similar manner, but this will not deviate from the spirit of the utility model or exceed the scope defined by the attached claims.

[0025] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A hydraulic control oil circuit for a flow system of an injection molding machine, It is characterized in that It includes a motor, a first hydraulic pump, a second hydraulic pump, a first relief valve, a second relief valve and a first oil tank, wherein the first hydraulic pump and the second hydraulic pump are both connected to the output shaft of the motor, and the oil inlets of the first hydraulic pump and the second hydraulic pump are both connected to the first oil tank, and the oil outlets of the first hydraulic pump and the second hydraulic pump are both connected to the oil inlet of the injection molding machine; The first overflow valve is connected to the oil outlet of the first hydraulic pump, the second overflow valve is connected to the oil outlet of the second hydraulic pump, and the second overflow valve is configured as an electromagnetic overflow valve, an electromagnet is provided on the electromagnetic overflow valve, when the electromagnet is energized, the electromagnetic overflow valve opens, and when the electromagnet loses power, the electromagnetic overflow valve closes.

2. A hydraulic control oil circuit of a flow system for an injection molding machine according to claim 1, It is characterized in that It also includes a first one-way valve, which is located between the second hydraulic pump and the injection molding machine and faces the oil inlet of the injection molding machine; The oil inlet of the first one-way valve is communicated with the oil outlet of the second hydraulic pump, and the oil outlet of the first one-way valve is communicated with the oil inlet of the second hydraulic pump.

3. A hydraulic control oil circuit of a flow system for an injection molding machine according to claim 2, It is characterized in that It also includes a first pressure gauge and a second pressure gauge, wherein the first pressure gauge is located between the first one-way valve and the oil inlet of the injection molding machine, and the second pressure gauge is located between the first one-way valve and the oil outlet of the second hydraulic pump.

4. The hydraulic control oil circuit of a flow system for an injection molding machine according to claim 1, It is characterized in that It also includes a second one-way valve and a second oil tank, the oil inlet of the second one-way valve is connected to the oil outlet of the second oil tank, the oil outlet of the second one-way valve is connected to the oil inlet of the second hydraulic pump, and the oil outlet of the electromagnetic overflow valve is connected to the oil inlet of the second oil tank.

5. The hydraulic control oil circuit of a flow system for an injection molding machine according to claim 1, It is characterized in that It also includes a first filter and a second filter. The first filter is located in the first oil tank and connected to the oil inlet of the first hydraulic pump. The second filter is located in the first oil tank and connected to the oil inlet of the second hydraulic pump.

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