Micro-arc oxidation device for inner wall of light alloy workpiece

Abstract

The embodiment of the utility model discloses a light alloy workpiece inner wall micro-arc oxidation device which comprises a cathode tube body used for being inserted into a light alloy workpiece, and a plurality of hole bodies are formed in the side wall of the cathode tube body; the conveying pipeline is communicated with the cathode tube body, and under the condition that micro-arc oxidation operation is carried out, the conveying pipeline conveys electrolyte to the cathode tube body, and the electrolyte flows to the inner wall of the light alloy workpiece through the hole body; the cooling equipment is provided with a cooling medium, and part of the conveying pipeline is soaked in the cooling medium; the refrigeration equipment is connected to the cooling equipment and is used for refrigerating the cooling medium; the temperature detection part is arranged in the cooling equipment and used for detecting the temperature of the cooling medium, and the temperature detection part is electrically connected to the refrigeration equipment; and under the condition that the temperature detection piece detects that the temperature of the cooling medium rises to the preset temperature, the refrigeration equipment is controlled to operate, and the temperature of the cooling medium is reduced. Through the arrangement, the cooling effect and the cooling reliability are improved, the normal operation of the micro-arc oxidation reaction is ensured, the electrolyte can be accurately cooled, and the purposes of saving energy and reducing consumption are achieved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of metal surface treatment, and in particular to a micro-arc oxidation device for the inner wall of a light alloy workpiece. Background Art

[0002] Micro-arc oxidation technology is a light alloy surface treatment technology with simple process and relatively environmentally friendly. Micro-arc oxidation reaction is an exothermic reaction. Without effective temperature control measures, the electrolyte temperature will rise rapidly as the reaction proceeds, which will have an adverse effect on the growth of the film layer. In the prior art, the commonly used cathode is a stainless steel plate. Although the material is simple and the area can be adjusted, it cannot meet the requirements of micro-arc oxidation of the inner wall of the workpiece; at the same time, the heat dissipation effect of the electrolyte during micro-arc oxidation is poor, which affects the micro-arc oxidation effect. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art or related technology.

[0004] To this end, the utility model provides a light alloy workpiece inner wall micro-arc oxidation device.

[0005] In view of this, according to an embodiment of the present application, a light alloy workpiece inner wall micro-arc oxidation device is proposed, comprising:

[0006] A cathode tube body is used to be inserted into the light alloy workpiece, and a plurality of holes are opened on the side wall of the cathode tube body;

[0007] A delivery pipeline is connected to the cathode tube body. When the micro-arc oxidation operation is performed, the delivery pipeline delivers the electrolyte to the cathode tube body and flows to the inner wall of the light alloy workpiece through the hole body.

[0008] A cooling device provided with a cooling medium for cooling a portion of the conveying pipeline and the light alloy workpiece;

[0009] A refrigeration device, connected to the cooling device, for refrigerating the cooling medium;

[0010] A temperature detection element is arranged in the cooling device and is used to detect the temperature of the cooling medium. The temperature detection element is electrically connected to the cooling device.

[0011] When the temperature detecting element detects that the temperature of the cooling medium rises to a preset temperature, the refrigeration equipment is controlled to operate to reduce the temperature of the cooling medium.

[0012] In a feasible implementation, it also includes:

[0013] The insulating sealing plug is used to be inserted into the interior of the light alloy workpiece and to fix the cathode tube body inside the light alloy workpiece.

[0014] In a feasible implementation, it also includes:

[0015] The first storage tank is used to store low-temperature cooling medium. The refrigeration equipment is connected to the first storage tank, and the first storage tank is connected to the cooling equipment.

[0016] In a feasible implementation manner, the cooling device comprises:

[0017] case;

[0018] A partition, the partition separates the shell into a first space and a second space, wherein the first space is used to place a light alloy workpiece, and the second space is used to place part of the conveying pipeline, wherein a through hole is opened along the thickness direction of the partition, and cooling medium flows in both the first space and the second space.

[0019] In a feasible implementation manner, the shell is an insulating shell.

[0020] In a feasible implementation, it also includes:

[0021] A stopper is located in the first space and is arranged near the upper surface of the cooling device;

[0022] When the height of the cooling medium reaches the height of the stopper, the supply of the cooling medium to the cooling device is stopped.

[0023] In a feasible implementation manner, part of the conveying pipeline in the second space is arranged in a spiral manner.

[0024] In a feasible implementation, it also includes:

[0025] The second storage tank is used to store electrolyte, and the delivery pipeline is connected to the second storage tank.

[0026] In a feasible implementation, it also includes:

[0027] A first pump body, disposed at the refrigeration device, for conveying the high-temperature cooling medium in the second space to the refrigeration device;

[0028] A second pump body is disposed at the delivery pipeline between the first space and the second space, and is used to deliver the electrolyte in the second space to the cathode tube body;

[0029] A third pump body is disposed at the delivery pipeline between the first space and the second storage tank, and is used to pump the electrolyte after the micro-arc oxidation reaction into the second storage tank;

[0030] a fourth pump body, disposed between the first storage tank and the first space, and used for conveying the low-temperature cooling medium in the first storage tank to the first space;

[0031] Wherein, the third pump body includes a filter pump.

[0032] In a feasible implementation, it also includes:

[0033] A first liquid level sensor is electrically connected to the filter pump, and controls the fourth pump body to start when the height of the cooling medium in the first storage tank reaches the height of the first liquid level sensor;

[0034] A second liquid level sensor is electrically connected to the refrigeration device, and controls the operation of the refrigeration device when the level of the cooling medium in the first storage tank reaches the level of the second liquid level sensor;

[0035] Wherein, the height of the first liquid level sensor is higher than the height of the second liquid level sensor.

[0036] Compared with the prior art, the utility model includes at least the following beneficial effects: the micro-arc oxidation device for the inner wall of a light alloy workpiece provided in the embodiment of the present application is provided with a cathode tube body, a conveying pipeline, a cooling device, a refrigeration device and a temperature detection component. Among them, the cathode tube body can be inserted into the interior of the light alloy workpiece, and the side wall of the cathode tube body can be opened with multiple holes. The electrolyte is transported to the cathode tube body through the conveying pipe, and flows into the cavity formed between the cathode tube body and the inner wall of the light alloy workpiece through the holes. The light alloy workpiece can be connected to the anode of the power supply, and the cathode tube body can be connected to the cathode of the power supply. Under certain process parameters, a micro-arc oxidation reaction can occur in the cavity area, thereby forming a layer of ceramic film on the inner wall of the light alloy workpiece to provide good protection for the inner wall of the light alloy workpiece. During the reaction, the electrolyte absorbs a large amount of heat and the temperature rises significantly. A cooling medium is provided in the cooling equipment, and part of the conveying pipe and the light alloy workpiece can be immersed in the cooling medium. Heat exchange is performed between the low-temperature cooling medium and the high-temperature electrolyte to reduce the temperature of the electrolyte and the light alloy workpiece. The temperature detection component can detect the temperature of the cooling medium, and the temperature detection component is electrically connected to the refrigeration equipment. When the temperature detection device detects that the temperature of the cooling medium has reached the preset temperature, it means that the temperature of the cooling medium is high and the cooling effect is poor. The refrigeration equipment is started to cool the cooling medium to ensure that the cooling medium used to cool the electrolyte continues to maintain a low temperature, improve the cooling effect and cooling reliability, ensure that the micro-arc oxidation reaction is at a normal temperature, ensure the normal growth of the film layer, and improve the film quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0038] Figure 1 A schematic structural diagram of a light alloy workpiece inner wall micro-arc oxidation device according to an embodiment of the present application.

[0039] in, Figure 1 The corresponding relationship between the reference numerals and the component names is as follows:

[0040] 110 cathode tube body, 120 delivery pipeline, 130 cooling device, 131 shell, 132 partition, 140 refrigeration device, 150 first storage tank, 160 first pump body, 170 second pump body, 180 second storage tank, 190 third pump body, 200 light alloy workpiece, 210 fourth pump body. DETAILED DESCRIPTION

[0041] In order to better understand the above-mentioned technical scheme, the technical scheme of the embodiments of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical scheme of the embodiments of the present application, rather than limitations on the technical scheme of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments may be combined with each other.

[0042] like Figure 1 As shown, according to the embodiment of the present application, a light alloy processing

[0043] The device for micro-arc oxidation of the inner wall of a workpiece comprises: a cathode tube body 110, which is used to be inserted into the inside of the light alloy workpiece, and a plurality of holes are opened on the side wall of the cathode tube body 110; a delivery pipeline 120, which is connected to the cathode tube body 110, and when the micro-arc oxidation operation is performed, the delivery pipeline 120 delivers electrolyte to the cathode tube body 110, and the electrolyte flows to the inner wall of the light alloy workpiece through the holes; a cooling device 130, which is provided with a cooling medium, and is used to cool part of the delivery pipeline and the light alloy workpiece; a refrigeration device 140, which is connected to the cooling device 130 and is used to cool the cooling medium; a temperature detection device, which is arranged in the cooling device 130 and is used to detect the temperature of the cooling medium, and the temperature detection device is electrically connected to the refrigeration device 140; wherein, when the temperature detection device detects that the temperature of the cooling medium rises to a preset temperature, the refrigeration device 140 is controlled to operate to reduce the temperature of the cooling medium.

[0044] It can be understood that the micro-arc oxidation device for the inner wall of a light alloy workpiece provided in the embodiment of the present application is provided with a cathode tube body 110, a conveying pipeline 120, a cooling device 130, a refrigeration device 140 and a temperature detection component. Among them, the cathode tube body 110 can be inserted into the interior of the light alloy workpiece, and the side wall of the cathode tube body 110 can be opened with multiple holes. The electrolyte is transported to the cathode tube body 110 through the conveying pipe 120, and flows into the cavity formed between the cathode tube body 110 and the inner wall of the light alloy workpiece through the holes. The light alloy workpiece can be connected to the anode of the power supply, and the cathode tube body 110 can be connected to the cathode of the power supply. Under certain process parameters, a micro-arc oxidation reaction can occur in the cavity area, thereby forming a layer of ceramic film on the inner wall of the light alloy workpiece to provide good protection for the inner wall of the light alloy workpiece. During the reaction, the electrolyte absorbs a large amount of heat and the temperature rises significantly. A cooling medium is provided in the cooling device 130, and part of the conveying pipe 120 and the light alloy workpiece 200 can be immersed in the cooling medium. Heat exchange is performed between the low-temperature cooling medium and the high-temperature electrolyte to reduce the temperature of the electrolyte. The temperature detection element can detect the temperature of the cooling medium, and the temperature detection element is electrically connected to the refrigeration device 140. When the temperature detection element detects that the temperature of the cooling medium reaches the preset temperature, it means that the temperature of the cooling medium is high and the cooling effect is poor. The refrigeration device 140 is started to cool the cooling medium to ensure that the cooling medium for cooling the electrolyte continues to maintain a low temperature, improve the cooling effect and cooling reliability, ensure that the micro-arc oxidation reaction is at a normal temperature, ensure the normal growth of the film layer, and improve the film quality. And according to the temperature control of the electrolyte and the cooling medium, the electrolyte can be accurately cooled to achieve the purpose of energy saving and consumption reduction.

[0045] It should be noted that the shape of the cathode tube body 110 can match the shape of the inner wall of the light alloy workpiece to ensure the film quality of the inner wall of the light alloy workpiece. The cathode tube body 110 can be made of conductive and corrosion-resistant materials to ensure service life. The transmission pipeline can be made of heat-conducting materials with good corrosion resistance to ensure heat exchange effect and service life.

[0046] In some examples, such as Figure 1 As shown, the light alloy workpiece inner wall micro-arc oxidation device further includes: an insulating sealing plug, which is used to be inserted into the interior of the light alloy workpiece to fix the cathode tube body 110 inside the light alloy workpiece to prevent the cathode tube body 110 from contacting the light alloy workpiece 200.

[0047] It is understandable that an insulating sealing plug may be provided. After the cathode tube body 110 is inserted into the light alloy workpiece, the inner ends of the light alloy workpiece are sealed by the insulating sealing plug to ensure that the electrolyte does not flow out and fix the cathode tube body 110 to improve stability.

[0048] In some examples, such as Figure 1 As shown, the above-mentioned light alloy workpiece inner wall micro-arc oxidation device also includes: a first storage tank 150 for storing low-temperature cooling medium, the above-mentioned refrigeration equipment 140 is connected to the above-mentioned first storage tank 150, and the above-mentioned first storage tank 150 is connected to the above-mentioned cooling equipment 130.

[0049] It is understandable that the above-mentioned light alloy workpiece inner wall micro-arc oxidation device may also be provided with a first storage tank 150. Specifically, the first storage tank 150 can store low-temperature cooling medium, and the first storage tank 150 is connected to the cooling device 130. By providing the first storage tank 150, the low-temperature cooling medium can be continuously provided to the cooling device 130, so as to ensure that the electrolyte is continuously and stably cooled, the micro-arc oxidation reaction is at a normal temperature, the normal growth of the film layer is ensured, and the film quality is improved.

[0050] It should be noted that after the refrigeration equipment 140 cools the high-temperature cooling medium, the low-temperature cooling medium can be transported to the first storage tank 150 for storage, so that the first storage tank 150 can subsequently continuously and stably supply the low-temperature cooling medium to the cooling equipment 130, thereby forming a cooling medium circulation flow path.

[0051] In some examples, such as Figure 1 As shown, the cooling device 130 includes: a shell 131; a partition 132, wherein the partition 132 separates the shell 131 into a first space and a second space, wherein the first space is used to place the light alloy workpiece 200, and the second space is used to place part of the conveying pipeline 120, wherein a through hole is opened along the thickness direction of the partition 132, and cooling medium flows in both the first space and the second space.

[0052] It is understandable that the cooling device 130 may be provided with a shell 131 and a partition 132. The partition 132 may separate the shell 131 into a first space and a second space. The light alloy workpiece 200 and the cathode tube body 110 may be placed in the first space, the delivery pipeline 120 passes through the shell 131 and is connected to the cathode tube body 110, and part of the delivery pipeline 120 is located in the second space. The shell at the first space may be provided with a liquid inlet, and the first storage tank 150 may deliver a low-temperature cooling medium to the first space through the liquid inlet, and flow into the second space along the through hole of the partition to cool the light alloy workpiece and the electrolyte in the delivery pipeline 120. Such a configuration is simple in structure and saves space.

[0053] In some examples, such as Figure 1 As shown, the housing 131 is an insulating housing 131 .

[0054] It is understandable that the shell 131 can be an insulating shell 131 to ensure safety, and the shell 131 has good corrosion resistance to ensure service life. And the part of the shell 131 corresponding to the first space can be a transparent shell 131, so that the staff can observe the micro-arc oxidation process. The bottom of the part of the shell 131 in the second space can be provided with a drainage hole to discharge the cooling medium and clean the shell 131.

[0055] In some examples, such as Figure 1 As shown, the above-mentioned light alloy workpiece inner wall micro-arc oxidation device also includes: a limiter, which is located in the first space and is arranged close to the upper surface of the above-mentioned cooling device 130; when the height of the cooling medium reaches the height of the above-mentioned limiter, the cooling medium is stopped from being supplied to the above-mentioned cooling device.

[0056] It is understandable that the micro-arc oxidation device for the inner wall of a light alloy workpiece may also be provided with a limiter. Specifically, the limiter may be provided near the upper surface of the cooling device 130, and when the height of the cooling medium reaches the height of the limiter, an alarm may be issued to prompt the cooling medium to be stopped from being delivered to the cooling device 130, thereby improving reliability.

[0057] In some examples, such as Figure 1 As shown, part of the delivery pipeline 120 in the second space is spirally arranged.

[0058] It can be understood that part of the delivery pipeline 120 located in the second space can be arranged in a spiral shape to increase the contact area with the cooling medium in the second space and improve the cooling performance of the electrolyte.

[0059] In some examples, such as Figure 1 As shown, the above-mentioned light alloy workpiece inner wall micro-arc oxidation device also includes: a second storage tank 180 for storing electrolyte, and the above-mentioned delivery pipeline 120 is connected to the above-mentioned second storage tank 180.

[0060] It is understandable that the micro-arc oxidation device for the inner wall of the light alloy workpiece is also provided with a second storage tank 180. Specifically, the second storage tank 180 can store electrolyte, and the delivery pipe 120 is connected to the second storage tank 180. The high-temperature electrolyte after the micro-arc oxidation reaction in the first space can be transported to the second storage tank, and the electrolyte stored in the second storage tank can be transported to the cathode tube body 110 through the delivery pipe, and then flow into the cavity between the light alloy workpiece 200 and the cathode tube body 110 through the hole body of the cathode tube body 110. And in the process of transporting the electrolyte, the delivery pipe 120 will exchange heat with the low-temperature cooling medium in the second space to reduce the electrolyte temperature and ensure the normal micro-arc oxidation reaction. In this way, an electrolyte circulation flow path is formed to ensure a continuous supply of electrolyte.

[0061] In some examples, such as Figure 1 As shown, the above-mentioned light alloy workpiece inner wall micro-arc oxidation device also includes:

[0062] The first pump body 160 is disposed at the refrigeration device and is used to transport the high-temperature cooling medium in the second space to the refrigeration device;

[0063] A second pump body 170 is disposed at the delivery pipe between the first space and the second space, and is used to deliver the electrolyte in the second space to the cathode tube body;

[0064] A third pump body 190 is disposed at the delivery pipeline between the first space and the second storage tank, and is used to pump the electrolyte after the micro-arc oxidation reaction into the second storage tank;

[0065] The fourth pump body 210 is disposed between the first storage tank and the first space, and is used to transport the low-temperature cooling medium in the first storage tank to the first space;

[0066] Wherein, the third pump body 190 includes a filter pump.

[0067] It is understandable that the above-mentioned light alloy workpiece inner wall micro-arc oxidation device can also be provided with a first pump body 160, a second pump body 170, a third pump body 190 and a fourth pump body 210. The four pump bodies are provided to provide power for the circulation of the electrolyte circuit and the cooling medium circuit. Among them, the third pump body 190 can use a filter pump to filter out impurities in the electrolyte after the micro-arc oxidation reaction, ensure the normal progress of the subsequent reaction, and improve reliability. The first pump body 160, the second pump body 170 and the fourth pump body 210 can use diaphragm pumps.

[0068] In some examples, such as Figure 1 As shown, the light alloy workpiece inner wall micro-arc oxidation device further includes: a first liquid level sensor electrically connected to the filter pump, and when the height of the cooling medium in the first storage tank reaches the height of the first liquid level sensor, the fourth pump body is controlled to start;

[0069] A second liquid level sensor is electrically connected to the refrigeration device, and controls the operation of the refrigeration device when the level of the cooling medium in the first storage tank reaches the level of the second liquid level sensor;

[0070] Wherein, the height of the first liquid level sensor is higher than the height of the second liquid level sensor.

[0071] It is understandable that the micro-arc oxidation device for the inner wall of the light alloy workpiece may also be provided with a first liquid level sensor and a second liquid level sensor. Specifically, the first liquid level sensor and the second liquid level sensor are both provided in the first storage tank 150, and the height of the first liquid level sensor is higher than the height of the second liquid level sensor. The second liquid level sensor is electrically connected to the refrigeration device 140 to control the operation of the refrigeration device 140, and the first liquid level sensor is electrically connected to the fourth pump body 210 to control the start and stop of the fourth pump body 210. In this way, when the temperature detection element detects that the temperature of the cooling medium reaches the preset temperature, the first pump body 160 is started, the high-temperature cooling medium in the cooling device 130 is transported to the refrigeration device 140, and the low-temperature cooling medium in the first storage tank 150 is transported to the cooling device 130, and the liquid level in the first storage tank 150 is reduced. When the liquid level corresponding to the second liquid level sensor is reached, the second liquid level sensor controls the refrigeration device 140 to refrigerate the high-temperature cooling medium inside it, and transports the refrigerated low-temperature cooling medium to the first storage tank 150 for storage. After the refrigeration device 140 delivers low-temperature cooling medium to the first storage tank 150, causing the liquid level to rise to the liquid level height corresponding to the first liquid level sensor, the first liquid level sensor controls the fourth pump body 210 to start, so as to deliver the low-temperature cooling medium to the cooling device 130, and at the same time controls the refrigeration device 140 to stop refrigeration, thereby ensuring that the cooling medium in the first storage tank 150 always maintains an appropriate amount.

[0072] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection;

[0073] "Connected" can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0074] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0075] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0076] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A light alloy workpiece inner wall micro-arc oxidation device, characterized in that: include: A cathode tube body, used for being inserted into the light alloy workpiece, and a plurality of holes are formed on the side wall of the cathode tube body; A delivery pipeline is connected to the cathode tube body. When the micro-arc oxidation operation is performed, the delivery pipeline delivers the electrolyte to the cathode tube body and flows to the inner wall of the light alloy workpiece through the hole body; A cooling device provided with a cooling medium for cooling a portion of the conveying pipeline and the light alloy workpiece; A refrigeration device, connected to the cooling device, for refrigerating the cooling medium; A temperature detection element, disposed in the cooling device, for detecting the temperature of the cooling medium, the temperature detection element being electrically connected to the cooling device; Wherein, when the temperature detecting element detects that the temperature of the cooling medium rises to a preset temperature, the refrigeration equipment is controlled to operate to reduce the temperature of the cooling medium.

2. The micro-arc oxidation device for the inner wall of a light alloy workpiece according to claim 1, characterized in that: Also includes: The insulating sealing plug is used to be inserted into the interior of the light alloy workpiece and to fix the cathode tube body inside the light alloy workpiece.

3. The micro-arc oxidation device for the inner wall of a light alloy workpiece according to claim 1, characterized in that: Also includes: The first storage tank is used to store low-temperature cooling medium. The refrigeration equipment is connected to the first storage tank, and the first storage tank is connected to the cooling equipment.

4. The micro-arc oxidation device for the inner wall of a light alloy workpiece according to claim 3, characterized in that: The cooling device comprises: case; A partition, the partition separates the shell into a first space and a second space, wherein the first space is used to place a light alloy workpiece, and the second space is used to place part of the conveying pipeline, wherein a through hole is opened along the thickness direction of the partition, and cooling medium flows in both the first space and the second space.

5. The micro-arc oxidation device for the inner wall of a light alloy workpiece according to claim 4, characterized in that: The shell is an insulating shell.

6. The micro-arc oxidation device for the inner wall of a light alloy workpiece according to claim 5, characterized in that: Also includes: A stopper is located in the first space and is arranged near the upper surface of the cooling device; When the height of the cooling medium reaches the height of the stopper, the supply of the cooling medium to the cooling device is stopped.

7. The micro-arc oxidation device for the inner wall of a light alloy workpiece according to claim 6, characterized in that: Part of the delivery pipeline in the second space is arranged in a spiral manner.

8. The micro-arc oxidation device for the inner wall of a light alloy workpiece according to claim 7, characterized in that: Also includes: The second storage tank is used to store electrolyte, and the delivery pipeline is connected to the second storage tank.

9. The micro-arc oxidation device for the inner wall of a light alloy workpiece according to claim 8, characterized in that: Also includes: A first pump body, disposed at the refrigeration device, for conveying the high-temperature cooling medium in the second space to the refrigeration device; A second pump body is disposed at the delivery pipeline between the first space and the second space, and is used to deliver the electrolyte in the second space to the cathode tube body; A third pump body is disposed at the delivery pipeline between the first space and the second storage tank, and is used to pump the electrolyte after the micro-arc oxidation reaction into the second storage tank; a fourth pump body, disposed between the first storage tank and the first space, and used for conveying the low-temperature cooling medium in the first storage tank to the first space; Wherein, the third pump body includes a filter pump.

10. The micro-arc oxidation device for the inner wall of a light alloy workpiece according to claim 9, characterized in that: Also includes: A first liquid level sensor is electrically connected to the filter pump, and controls the fourth pump body to start when the height of the cooling medium in the first storage tank reaches the height of the first liquid level sensor; a second liquid level sensor, electrically connected to the refrigeration device, and controlling the operation of the refrigeration device when the height of the cooling medium in the first storage tank reaches the height of the second liquid level sensor; Wherein, the height of the first liquid level sensor is higher than the height of the second liquid level sensor.

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