Injection control system for die casting machine

Abstract

The utility model relates to an injection control system for a die-casting machine, which comprises an injection cylinder, an inlet of the injection cylinder is connected with a quick energy accumulator group through a pipeline, and the injection cylinder is connected with an oil tank through an outlet of the injection cylinder; the injection speed closed-loop control module comprises a quick discharge servo proportional valve arranged at an outlet of the injection cylinder; the injection position encoder is arranged on a motion path of a piston rod of the injection cylinder and is used for detecting an injection position; the magnetic strip is arranged on the piston rod and is matched with the injection position encoder; in addition, the system further comprises a programmable controller and a man-machine interaction screen, and the programmable controller is in signal connection with the quick discharge servo proportional valve and the injection position encoder. According to the injection control system for the die casting machine, closed-loop control over the injection speed is achieved, the technological requirement can be rapidly met, the precision requirement can be repeatedly met without difference, intellectualization is improved, operation of technicians is facilitated, labor and time cost is saved, and the yield of workpieces is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of mechanical processing casting, especially relate to a injection control system for die casting machine. BACKGROUND

[0002] With the rapid development of manufacturing industry, the injection precision and intelligentization of die casting machine are required more and more. At present, most domestic die casting machines adopt inlet control, for example, the injection speed, the opening degree of one fast valve and two fast valves is adjusted by the operator through the control hand wheel to adjust the injection speed in the prior art. On the one hand, the experience of the operator is required higher, on the other hand, the adjustment control is inconvenient, the die casting process needs to be adjusted for many times to reach the technical requirement, the labor cost and time cost are higher, and it is difficult to guarantee the stability of product quality and quality requirement. CONTENT OF UTILITY MODEL

[0003] The utility model discloses in order to overcome the defect that injection speed and injection pressure of die casting machine are difficult to control accurately and accurate recurrence in the prior art, and provide a injection control system for die casting machine.

[0004] The utility model discloses a technical scheme to solve the above technical problem:

[0005] A kind of injection control system for die casting machine, it includes injection cylinder, the injection cylinder inlet is connected with quick energy accumulator group by pipeline, injection cylinder outlet pipeline is connected with oil tank;Its characterized in that, the injection control system for die casting machine includes injection speed control module, the injection speed control module includes the fast discharge servo proportional valve being set on the injection cylinder outlet pipeline;Injection position encoder is arranged at the side of the piston rod movement path of the injection cylinder, and magnetic stripe is arranged on the piston rod and is adapted with the injection position encoder;The injection control system for die casting machine further includes programmable controller, man-machine interface screen, the programmable controller is connected with the fast discharge servo proportional valve, the injection position encoder signal.

[0006] Wherein, the quick energy accumulator group includes that first energy accumulator and second energy accumulator are used in parallel, the quick energy accumulator is connected with the injection cylinder inlet pipeline, a fast proportional valve is arranged on the quick energy accumulator pipeline;Second fast proportional valve is arranged on the quick energy accumulator pipeline.

[0007] Wherein, injection hammer limit block is further equipped on the same side of the injection position encoder, and the injection hammer limit block is connected with the programmable controller.

[0008] Wherein, the injection control system for die casting machine further includes injection pressure boost control module, the injection pressure boost control module includes boost cylinder connected with the injection cylinder, the boost cylinder is connected with boost energy accumulator by boost pipeline, and boost proportional valve is arranged on the boost pipeline.

[0009] The injection cylinder outlet is provided with a pressure boosting and quick discharge servo proportional valve between the oil tank and the injection cylinder outlet; the injection boosting control module also includes an outlet pressure sensor and a pressure boosting and quick discharge proportional valve installed on the boosting cylinder, and both the boosting cylinder outlet pressure sensor and the pressure boosting and quick discharge proportional valve are connected to the programmable controller.

[0010] The beneficial effects of this utility model are as follows: The injection control system for the die casting machine of this utility model realizes closed-loop control of injection parameters, which can quickly meet the process requirements and can repeatedly meet the accuracy requirements without difference. It is intelligently improved, convenient for technicians to operate, saves labor and time costs, and improves the yield of workpieces. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the injection control system for a die-casting machine in a preferred embodiment of the present invention.

[0012] Figure 2 This is a schematic diagram of the injection control system for a die-casting machine in another preferred embodiment of the present invention. Detailed Implementation

[0013] The present invention will be described more clearly and completely below with reference to a preferred embodiment and the accompanying drawings.

[0014] Example 1

[0015] like Figure 1 As shown, the injection control system for the die-casting machine in this embodiment includes an injection cylinder 1, which is connected to a rapid energy storage unit via an energy storage pipe and to an oil tank 3 via a first hydraulic pipe 12. The injection control system includes an injection speed control module, which includes a fast-discharge servo proportional valve 4 mounted on the first hydraulic pipe 12; an injection position encoder 5 mounted on the side of the piston rod 11's movement path in the injection cylinder 1; and a magnetic strip (not shown) mounted on the piston rod 11 and adapted to the injection position encoder. Furthermore, the injection control system also includes a programmable logic controller (PLC, not shown), which is signal-connected to the fast-discharge servo proportional valve 4 and the injection position encoder 5. For ease of parameter setting and adjustment, the PLC also includes a human-machine interface screen.

[0016] The energy storage unit includes a first energy storage unit 22 and a second energy storage unit 25. The first energy storage unit 22 is connected to the injection cylinder 1 through a first energy storage pipe 21, and a first proportional valve 23 is provided on the first energy storage pipe 21; the second energy storage unit 25 is connected to the injection cylinder 1 through a second energy storage pipe 24, and a second proportional valve 26 is provided on the second energy storage pipe 24.

[0017] On the same side of the injection position encoder 5, an injection return hammer limiting block 6 is arranged, which is in signal connection with the programmable controller. When the piston rod 11 retreats to the limit position, the injection return hammer limiting block 6 sends a signal to the programmable controller that the position returns to the origin.

[0018] Before die casting, the given values of the injection speed and the injection position are set on the man-machine interactive screen according to the process parameters. The feedback values of the injection speed and the injection position are accurately detected through the cooperation of the magnetic stripe and the injection position encoder 5, and are fed back to the programmable controller by the injection position encoder 5. The injection speed and the nonlinear relationship of the fast discharge servo proportional valve 4, the programmable controller divides the corresponding proportion of the opening degree of the injection speed and the fast discharge servo proportional valve 4 into ten segments, and correspondingly calculates the ten straight line slopes and intercepts. After obtaining the comparison of the given values and the feedback values of the injection speed and the injection position, the proportional opening degree of the fast discharge servo proportional valve 4 is calculated through the closed-loop PID algorithm, so as to accurately control the injection speed.

[0019] Embodiment 2

[0020] As shown in Figure 2 The difference between the present embodiment and embodiment 1 is that the injection control system of the die casting machine further comprises a set of injection pressure control modules. Specifically, the injection pressure control module comprises a booster cylinder 7 connected with the injection cylinder 1, the booster cylinder 7 is connected with a booster energy accumulator 72 through a booster pipeline 71, and a booster proportional valve 73 is arranged on the booster pipeline 71 to further boost the solution in the mold cavity, eliminate the bubbles in the mold cavity, and ensure that the mold cavity is completely filled.

[0021] The injection cylinder 1 and the oil tank 3 are provided with a second oil pressure pipeline 74; the injection pressure control module further comprises an outlet pressure sensor 75 and a booster fast discharge proportional valve 76 arranged on the second oil pressure pipeline 74, and an outlet pressure sensor 77 arranged on the first oil pressure pipeline 12; the inlet pressure sensor 75, the outlet pressure sensor 77 and the booster fast discharge proportional valve 76 are in signal connection with the programmable controller.

[0022] On the one hand, the given values of the injection speed and the injection position are set on the man-machine interactive screen according to the process parameters, and on the other hand, the actual casting pressure value is calculated through the process, and the given casting pressure value is set on the man-machine interactive screen. The injection control system collects, feeds back, calculates and controls the injection speed, and at the same time collects the booster outlet pressure signal during injection through the PLC, compares the given casting pressure with the actually collected casting pressure through the PLC, outputs the analog quantity through fuzzy control, adjusts the booster fast discharge proportional valve, and finally automatically adjusts to the set casting pressure.

[0023] Although the specific embodiments of the present application are described above, those skilled in the art should understand that these are only illustrative, the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, but these changes and modifications all fall within the protection scope of the present application.

Claims

1. A pressure injection control system for a die casting machine, comprising a shot cylinder, the shot cylinder inlet being connected to a quick energy accumulator group through a pipe, and the shot cylinder outlet being connected to an oil tank; characterized in that, The injection control system of the die casting machine comprises an injection speed closed loop control module, the injection speed control module comprises a quick exhaust servo proportional valve arranged at the outlet of the injection cylinder; An injection position encoder for injection position detection is arranged on the movement path of the piston rod of the injection cylinder, and a magnetic strip is arranged on the piston rod and matched with the injection position encoder; the injection control system of the die casting machine further comprises a programmable controller and a human-computer interaction screen, the programmable controller is signal connected with the quick exhaust servo proportional valve and the injection position encoder.

2. The injection control system for a die casting machine according to claim 1, wherein The quick energy accumulator group comprises a first energy accumulator and a second energy accumulator in parallel, a quick proportional valve is arranged between the quick energy accumulator and the injection cylinder; a second quick proportional valve is arranged between the quick energy accumulator and the injection cylinder.

3. The injection control system for a die casting machine according to claim 2, wherein An injection hammer limit switch is arranged on the same side of the injection position encoder, and the injection hammer limit switch is signal connected with the programmable controller.

4. The injection control system for a die casting machine according to claim 3, wherein The injection control system of the die casting machine further comprises an injection pressure boosting control module, the injection pressure boosting control module comprises a pressure boosting cylinder connected with the injection cylinder, the pressure boosting cylinder is connected with a pressure boosting energy accumulator, a pressure boosting proportional valve is arranged between the pressure boosting energy accumulator and the pressure boosting cylinder.

5. The injection control system for a die casting machine according to claim 4, wherein A pressure boosting quick exhaust servo proportional valve is arranged between the outlet of the injection cylinder and the oil tank; the injection pressure boosting control module further comprises a pressure boosting quick exhaust proportional valve arranged on the pressure boosting cylinder and an outlet pressure sensor of the pressure boosting cylinder; the outlet pressure sensor of the pressure boosting cylinder and the pressure boosting quick exhaust proportional valve are signal connected with the programmable controller.

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