Magnesium alloy quantifying mechanism

Abstract

The magnesium alloy quantifying mechanism comprises a pump body, and a liquid inlet and a liquid outlet pipe are arranged in the pump body; the air storage tank is connected with the air inlet of the pump body through an air pipe, and a linear driving unit is arranged at one end of the air storage tank; and the plugs are arranged in the liquid inlet and the liquid outlet pipe, and when the linear driving unit drives the gas in the gas storage tank to enter or be pumped out of the pump body, the plugs of the liquid inlet and the liquid outlet pipe are correspondingly closed or opened. Except the linear driving unit, other mechanical loss parts are not arranged, the ceramic balls are durable, the failure rate and the consumable cost can be reduced, and the service life of the whole pump is effectively prolonged. In addition, the gas storage tank is arranged, mixed gas can be stored and reused, the mixed gas is compressed to serve as a medium for pushing the magnesium liquid, outward emission of greenhouse gas influencing the outside is effectively reduced, and meanwhile the input of the hardware cost of the gas treatment device can be reduced.

Description

Technical Field

[0001] This invention belongs to the field of metal die casting technology, and specifically relates to a magnesium alloy metering mechanism. Background Technology

[0002] In the process of metal die casting, a fixed amount of molten metal needs to be delivered to the feed pipe of the die casting machine. However, most existing metering mechanisms for magnesium alloys use mechanical pumps for delivery. For example, a magnesium alloy metering pump structure disclosed in CN203362531U uses a motor to drive the pump shaft to rotate, forming an annular flow channel in the bearing housing mounting pipe, the shaft protection pipe, and the discharge pipe, so as to fully mix the molten magnesium alloy solution. An impeller is set at the lower end of the shaft to enhance the stirring effect, and the feed plate and the shaft centering plate optimize the fluid path and axial positioning, thereby achieving the effect of metering delivery and full mixing.

[0003] However, due to its mechanical pump structure, which contains numerous moving mechanical components, it is prone to high failure rates after prolonged use, and the cost of replacement consumables is also high. Furthermore, magnesium alloy solutions are flammable and require operation in a closed or gas-protected environment. Since the protective gas is a greenhouse gas, emissions need to be controlled. Therefore, current technology requires significant investment in hardware such as gas treatment devices. Summary of the Invention

[0004] The purpose of this invention is to provide a magnesium alloy metering mechanism to solve the problems in the prior art.

[0005] Therefore, the present invention provides a magnesium alloy metering mechanism, comprising: The pump body has an inlet and an outlet pipe inside. An air storage tank is connected to the air inlet of the pump body via an air pipe, and a linear drive unit is provided at one end of the air storage tank. The plugs are installed inside the inlet and outlet pipes. When the linear drive unit drives the gas in the gas storage tank to enter or exit the pump body, the plugs in the inlet and outlet pipes are closed or opened accordingly.

[0006] In some embodiments, the pump body includes a pump housing and a flange disposed at one end of the pump housing, and a contact pin is fixed on the flange for detecting the liquid level of the magnesium alloy liquid; An immersion heater and a thermocouple are installed on the flange. Both the immersion heater and the thermocouple are inserted into the pump body for heating the magnesium alloy liquid and detecting its temperature.

[0007] In some embodiments, a gas cooling box is provided between the gas storage tank and the pump body, the gas cooling box being used to cool the gas.

[0008] In some embodiments, the plug is a ceramic ball, and both the inlet and the outlet are variable diameter structures.

[0009] In some embodiments, when the pump body is in the liquid suction state, the pump body is in a negative pressure state, the plug is disengaged from the liquid inlet, and the plug in the liquid outlet pipe is in its original position.

[0010] In some embodiments, when the pump body is in the liquid discharge state, the pump body is in a positive pressure state, the plug at the liquid inlet is in its original position, and the plug in the liquid outlet pipe moves upward.

[0011] In some embodiments, the linear drive unit is a servo electric cylinder, and one end of the servo electric cylinder is connected to a piston that extends into the air tank.

[0012] In some embodiments, the pump casing is made of low-carbon steel, and the immersion heater is made of heat-resistant steel.

[0013] In some embodiments, the gas cooling box is a heat exchanger.

[0014] In some embodiments, the gas is a protective gas, which is a mixture of N2 and FS6.

[0015] Beneficial effects: Apart from the linear drive unit, this invention does not include any other mechanically worn components. The ceramic balls are durable, reducing failure rates and consumable costs, and effectively extending the overall lifespan of the pump. Furthermore, this application includes a gas storage tank for storing and reusing mixed gas. This mixed gas is compressed and used as a medium to propel the magnesium liquid, effectively reducing the emission of greenhouse gases that could impact the environment, and also reducing the hardware costs of the gas treatment device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Fig. 1 This is a perspective view of an embodiment of the magnesium alloy metering mechanism provided by the present invention.

[0018] Fig. 2This is a perspective view of an embodiment of the magnesium alloy metering mechanism provided by the present invention.

[0019] Fig. 3 This is a front view of an embodiment of the magnesium alloy metering mechanism provided by the present invention.

[0020] In the diagram: 1. Pump casing; 2. Flange; 3. Contact pin; 4. Immersion heater; 5. Thermocouple; 6. Liquid inlet; 7. Liquid outlet pipe; 8. Gas storage tank; 9. Air inlet; 10. Gas pipe; 11. Servo electric cylinder; 12. Gas cooling box; 13. Ceramic ball. Detailed Implementation

[0021] The invention will be more readily understood by referring to the following detailed description of preferred embodiments and included examples. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. In case of conflict, the definitions in this specification shall prevail.

[0022] like Figs. 1-3 As shown, a magnesium alloy metering mechanism includes: The pump body has an inlet 6 and an outlet pipe 7 inside. A certain amount of magnesium alloy liquid can be drawn from the outside through the inlet 6, and a certain amount of magnesium alloy liquid can be discharged outward through the outlet pipe 7 as needed. The inlet 6 is located at the bottom of the pump body, while the outlet pipe 7 is inserted into the pump body from the top. That is, when the liquid is being fed in, the magnesium alloy liquid enters from the bottom of the pump body, and when the liquid is being discharged, the magnesium alloy liquid is pumped out from the top of the pump body through the outlet pipe 7.

[0023] A gas storage tank 8 is connected to the pump body's air inlet 9 via a gas pipe 10, and a linear drive unit is installed at one end of the gas storage tank 8. The gas storage tank 8 stores a protective gas, which can be a mixture of N2 and FS6. By providing the protective gas, the magnesium alloy liquid can be protected from combustion. Most importantly, the protective gas also serves as a power medium. When the protective gas is introduced into the pump body, it applies positive pressure, pumping the alloy liquid out of the pump body. When the magnesium alloy liquid is being drawn in, the protective gas is drawn back into the gas storage tank 8, enabling the reciprocating use of the protective gas. This prevents the emission of greenhouse gases that could impact the environment and reduces the hardware cost of the gas treatment device. The linear drive unit can be a servo electric cylinder 11, with a piston connected to one end extending into the gas storage tank 8 to achieve the intake and exhaust of the gas storage tank 8.

[0024] The plugs are installed inside the inlet 6 and the outlet pipe 7. When the linear drive unit drives the gas in the gas storage tank 8 to enter or exit the pump body, the plugs in the inlet 6 and the outlet pipe 7 are closed or opened accordingly. The plugs can be ceramic balls 13. The density of the ceramic balls 13 is greater than that of the magnesium alloy liquid. By changing the positive and negative pressure environment inside the pump body, the quantitative pumping out and intake of the magnesium alloy liquid can be achieved.

[0025] In summary, apart from the linear drive unit, the technical solution of this application does not include other mechanically worn components. The ceramic ball 13 is durable, reducing the failure rate and consumable costs, and effectively improving the overall service life of the pump. Furthermore, the gas storage tank 8 in this application can store and reuse the mixed gas, and the compressed mixed gas is used as the medium to drive the magnesium liquid, effectively reducing the emission of greenhouse gases that would impact the environment, while also reducing the hardware cost of the gas treatment device.

[0026] In some embodiments, the pump body includes a pump casing 1 and a flange 2 disposed at one end of the pump casing 1. A probe 3 is fixed on the flange 2, and the probe 3 is used to detect the liquid level of the magnesium alloy liquid. The pump casing 1 is made of low carbon steel and is used to store the magnesium liquid and serve as a chamber for gas pressure conversion. The flange 2 is fixedly connected to the pump casing 1 by bolts. The probe 3 is used to detect the liquid level of the magnesium liquid. When the magnesium liquid touches the probe 3, the intake of magnesium liquid is stopped to achieve quantitative absorption.

[0027] To achieve precise quantification, this invention incorporates a probe 3 within the pump body for detecting the level of the magnesium alloy liquid. When the pump is in suction mode, the linear drive unit, i.e., the servo cylinder 11, pushes the piston to extract gas from the gas storage tank 8, creating a negative pressure within the pump body. This causes the ceramic ball 13 at the inlet 6 to detach, allowing the magnesium alloy liquid to be drawn in. When the liquid level rises to contact the probe 3, the probe 3 sends a signal, the linear drive unit stops operating, and the ceramic ball 13 at the inlet 6 sinks to the bottom of the inlet 6 due to the density difference, sealing the channel and thus ensuring a consistent volume of magnesium liquid drawn in each time.

[0028] When molten magnesium needs to be pumped out, the control system calculates the required pushing distance of the servo cylinder 11 based on the weight of magnesium alloy needed for the die-casting process. This, in turn, adjusts the gas pressure in the gas tank 8 to push the molten magnesium out of the outlet pipe 7. Ideally, with a fixed volume of molten magnesium and gas in the pump body, the forward and backward distances of the servo cylinder 11 are also fixed, thus achieving a constant weight intake and output. In actual operation, the system can use a PLC to compensate for differences caused by factors such as temperature and gas pressure fluctuations in real time, further improving quantitative accuracy.

[0029] In summary, the quantitative mechanism of the present invention, by combining liquid level detection and air pressure control with the opening and closing action of the ceramic ball, achieves high-precision and repeatable quantitative delivery of magnesium alloy liquid, significantly improving the stability and consistency of the die-casting process.

[0030] An immersion heater 4 and a thermocouple 5 are installed on flange 2. Both the immersion heater 4 and the thermocouple 5 are inserted into the pump body for heating and temperature monitoring of the magnesium alloy liquid. The immersion heater 4 is an electric heater with a heat-resistant steel shell, used to control the temperature of the magnesium liquid inside the pump casing 1. The thermocouple 5 is used to monitor the temperature of the magnesium liquid inside the pump casing 1. It works in conjunction with the immersion heater 4, and the output power is adjusted by a PLC and SCR to maintain the magnesium liquid at the process temperature.

[0031] In one embodiment, a gas cooling box 12 is provided between the gas storage tank 8 and the pump body. The gas cooling box 12 is preferably a heat exchanger. The gas pipe 10 passes through the gas cooling box 12, which can cool the protective gas inside the gas pipe 10, extending the lifespan of the sealing ring of the gas storage tank 8. It is understood that when the protective gas enters the pump body, it is heated due to the high temperature inside the pump body. When drawing magnesium liquid, the protective gas is drawn back into the gas storage tank 8. The high-temperature gas can cause aging of the sealing ring of the gas storage tank 8, leading to leaks and other adverse effects. This application effectively solves the aging effect of high-temperature gas on the sealing ring by providing the gas cooling box 12, effectively improving the service life of the gas storage tank 8. In some embodiments, a gas inlet can be provided on the outside of the gas storage tank 8, allowing for replenishment of protective gas even in the event of gas loss.

[0032] In one embodiment, the plug is a ceramic ball 13, and both the inlet 6 and the outlet pipe 7 are variable diameter structures. The variable diameter structure means that the diameter of the bottom portion of the inlet 6 is smaller than the diameter of the upper portion. Therefore, under positive pressure, the ceramic ball 13 can completely seal the inlet 6, preventing leakage. Similarly, the bottom portion of the outlet pipe 7 is also smaller in diameter than the upper portion. When magnesium liquid is fed, the outlet pipe 7 can be completely sealed. When discharging, under positive pressure, the ceramic ball 13 moves upward. Since the diameter of the upper portion of the outlet pipe 7 is larger than the diameter of the ceramic ball 13, the magnesium liquid can be discharged outward from the gap between the two.

[0033] In one embodiment, when the pump body is in the suction state, it is under negative pressure, the plug is disengaged from the inlet 6, and the plug in the outlet pipe 7 remains in its original position. When the pump body is in the discharge state, it is under positive pressure, the plug in the inlet 6 remains in its original position, and the plug in the outlet pipe 7 moves upward. By changing the position of the ceramic ball 13 under different negative and positive pressure states, the switching between liquid inlet and discharge is achieved.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A magnesium alloy metering mechanism, characterized in that, include: The pump body has an inlet and an outlet pipe inside. An air storage tank is connected to the air inlet of the pump body via an air pipe, and a linear drive unit is provided at one end of the air storage tank. The plugs are installed inside the inlet and outlet pipes. When the linear drive unit drives the gas in the gas storage tank to enter or exit the pump body, the plugs in the inlet and outlet pipes are closed or opened accordingly.

2. The magnesium alloy metering mechanism according to claim 1, characterized in that, The pump body includes a pump casing and a flange disposed at one end of the pump casing. A contact pin is fixed on the flange and is used to detect the liquid level of the magnesium alloy liquid. An immersion heater and a thermocouple are installed on the flange. Both the immersion heater and the thermocouple are inserted into the pump body for heating the magnesium alloy liquid and detecting its temperature.

3. The magnesium alloy metering mechanism according to claim 1, characterized in that, A gas cooling box is provided between the gas storage tank and the pump body, and the gas cooling box is used to cool the gas.

4. The magnesium alloy metering mechanism according to claim 1, characterized in that, The plug is a ceramic ball, and both the inlet and the outlet are variable diameter structures.

5. The magnesium alloy metering mechanism according to claim 1, characterized in that, When the pump body is in the liquid suction state, the pump body is in a negative pressure state, the plug is disengaged from the liquid inlet, and the plug in the liquid outlet pipe is in its original position.

6. The magnesium alloy metering mechanism according to claim 1, characterized in that, When the pump body is in the liquid discharge state, the pump body is in a positive pressure state, the plug of the liquid inlet is in its original position, and the plug in the liquid outlet pipe moves upward.

7. The magnesium alloy metering mechanism according to claim 1, characterized in that, The linear drive unit is a servo electric cylinder, and one end of the servo electric cylinder is connected to a piston, which extends into the air tank.

8. The magnesium alloy metering mechanism according to claim 2, characterized in that, The pump casing is made of low-carbon steel, and the immersion heater is made of heat-resistant steel.

9. The magnesium alloy metering mechanism according to claim 3, characterized in that, The gas cooling box is a heat exchanger.

10. The magnesium alloy metering mechanism according to claim 1, characterized in that, The gas is a protective gas, which is a mixture of N2 and FS6.

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