Sample low-power pickling device

Abstract

The utility model discloses a sample low-power pickling device which comprises a sealed cabinet body, a pickling tank, at least one group of acid storage tanks, a temperature control heating device and a neutralizing pool, the pickling tank is arranged in the sealed cabinet body, a liquid inlet and a liquid outlet are formed in the pickling tank, and a pipe to be tested is placed in the pickling tank; the acid storage tanks are arranged inside the sealed cabinet body, at least one kind of acid liquid is stored in each of different acid storage tanks, and each group of acid storage tanks is provided with an independent liquid supply pipeline and an independent backflow pipeline; one end of the liquid supply pipeline is communicated with a liquid outlet of the corresponding acid storage tank, the other end of the liquid supply pipeline is communicated with a liquid inlet of the pickling tank, one end of the backflow pipeline is communicated with a liquid inlet of the corresponding acid storage tank, and the other end of the backflow pipeline is communicated with a liquid outlet of the pickling tank. According to the utility model, different types of acid liquid can be conveniently switched, and the problem that the temperature control heating device is corroded in the acid liquid for a long time is avoided.

Description

Technical Field

[0001] The utility model relates to a specimen macroetching pickling device, belonging to the technical field of pickling devices. Background Art

[0002] At present, according to relevant requirements, it is necessary to conduct in-plant acceptance inspection on pipes and carry out macroetching pickling tests. The types of pipes involve low-alloy steel and stainless steel, etc. By corroding the metal surface with acid solution, the metal microstructure can be exposed, thereby providing a basis for subsequent analysis.

[0003] After retrieving the prior art, it is found that a Chinese patent with the publication number CN220149674U discloses an automatic macroetching pickling system, which realizes the pickling treatment of pipes. However, it is found in the use process that in addition to different concentration ratios, different types of acid solutions need to be selected according to different materials for pickling. The pickling module can only accommodate one type of acid solution, which leads to the need to synchronously replace the acid solution every time the material is changed, and the operation process is complex and time-consuming. Secondly, the heating device is placed in the acid solution, and it is easily corroded by the acid solution during long-term use, resulting in the failure of the heating device and affecting the service life. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a specimen macroetching pickling device, which is convenient for switching between different types of acidic liquids and avoids the problem that the temperature control heating device is corroded in the acidic liquid for a long time.

[0005] To solve the above technical problem, the technical solution of the utility model is: a specimen macroetching pickling device, comprising:

[0006] A sealed cabinet;

[0007] A pickling tank, which is arranged in the sealed cabinet. The pickling tank is provided with a liquid inlet and a liquid outlet, and the pickling tank is suitable for placing the pipes to be tested;

[0008] At least one set of acid storage tanks, which are arranged inside the sealed cabinet. Different acid storage tanks store at least one type of acidic liquid respectively, and each set of acid storage tanks is respectively provided with an independent liquid supply pipeline and a reflux pipeline;

[0009] One end of the liquid supply pipeline is communicated with the liquid outlet of the corresponding acid storage tank, and the other end is communicated with the liquid inlet of the pickling tank. One end of the reflux pipeline is communicated with the liquid inlet of the corresponding acid storage tank, and the other end is communicated with the liquid outlet of the pickling tank;

[0010] A temperature-controlled heating device, which is installed in the pickling tank and is adapted to heat the acidic liquid in the pickling tank to a preset temperature;

[0011] A neutralization tank, which is arranged outside the sealed cabinet. The neutralization tank is provided with a waste liquid inlet and a waste liquid outlet, and the waste liquid inlet of the neutralization tank is respectively communicated with the pickling tank and the acid storage tank;

[0012] The neutralization tank is adapted to collect and neutralize the waste liquid discharged from the pickling tank and the acid storage tank, and discharge it from the waste liquid outlet.

[0013] Furthermore, a specific structure of the temperature-controlled heating device is provided. The temperature-controlled heating device includes:

[0014] A heating element, which is arranged in the pickling tank and is adapted to heat the acidic liquid entering the pickling tank;

[0015] A temperature sensor, which is installed in the pickling tank and is adapted to detect the temperature of the acidic liquid and send out a temperature signal;

[0016] A thermostat, which is electrically connected to the temperature sensor and the heating element respectively, and is adapted to control the heating of the heating element according to the temperature signal collected by the temperature sensor.

[0017] Furthermore, a specific structure of the acid-base neutralization device is provided. An acid-base neutralization device is arranged in the neutralization tank. The acid-base neutralization device includes:

[0018] A pH value detection component, which is installed in the neutralization tank and is adapted to monitor the pH value in the neutralization tank and send out a signal;

[0019] An alkaline liquid feeding component, which is provided with a liquid outlet hole, and the liquid outlet hole is communicated with the neutralization tank through a pipeline;

[0020] A controller, which is electrically connected to the pH value detection component and the alkaline liquid feeding component respectively, and is adapted to receive the signal sent by the pH value detection component and control the alkaline liquid feeding component to add alkaline liquid into the neutralization tank according to the signal.

[0021] Furthermore, a specific structure of the alkaline liquid feeding component is provided. The alkaline liquid feeding component includes:

[0022] An alkaline liquid storage tank, which is arranged outside the sealed cabinet;

[0023] A metering pump, the metering pump is provided with a liquid inlet end and a liquid outlet end, the liquid inlet end of the metering pump is communicated with the alkaline liquid storage tank, the liquid outlet end of the metering pump is communicated with the neutralization tank through a pipeline, and the metering pump is electrically connected to the controller.

[0024] Furthermore, in order to accelerate mixing, the sample macro-etching and pickling device further includes an aeration device, the aeration device is installed in the neutralization tank, and the aeration device is adapted to generate gas to mix the alkaline liquid added in the neutralization tank.

[0025] Furthermore, in order to facilitate cleaning, the sample macro-etching and pickling device further includes a cleaning tank, the cleaning tank is arranged in the sealed cabinet body and is adjacent to the pickling tank, and the cleaning tank is adapted to place pipes;

[0026] The upper part of the cleaning tank is provided with a water inlet, the water inlet is connected to an external water source, and the cleaning tank is adapted to convey cleaning liquid into the cleaning tank through the water inlet;

[0027] The lower part of the cleaning tank is provided with a liquid discharge port, the liquid discharge port is connected to the neutralization tank through a pipeline, and the cleaning tank is adapted to discharge the waste liquid after cleaning through the liquid discharge port;

[0028] The cleaning tank is suitable for cleaning and neutralizing the pipes after pickling treatment.

[0029] Furthermore, the cleaning liquid input by the external water source is hot water.

[0030] Furthermore, the sample macro-etching and pickling device further includes an alkali scrubber, and the alkali scrubber is installed outside the sealed cabinet body;

[0031] The alkali scrubber is provided with a gas collection port, the gas collection port is communicated with the inside of the sealed cabinet body through a pipeline, and the alkali scrubber is adapted to neutralize and discharge the acidic waste gas collected from the sealed cabinet body.

[0032] Adopting the above technical solutions, the utility model has the following beneficial effects:

[0033] In the present utility model, during use, one of a group of acid storage tanks can be selected, and a specific acidic liquid is introduced into the pickling tank through a liquid supply pipeline. Subsequently, a temperature control heating device is used to heat the acidic liquid. After the temperature reaches the preset value, a constant temperature state is maintained, and a pickling test of the pipe is carried out. After the pickling test is completed, the acidic liquid in the pickling tank will flow back to the original acid storage tank through a reflux pipeline. Then, when carrying out the pickling test of another type of pipe, another acid storage tank in the same group of acid storage tanks can be used, and this acid storage tank stores a mixed acidic liquid mixed with the previous acidic liquid. This mixed acidic liquid is introduced into the pickling tank through a liquid supply pipeline to carry out a new round of pickling test. After pickling is completed, the acidic liquid flows back to the corresponding acid storage tank through a reflux pipeline; in addition, according to the needs of different pipes, acidic liquids can also be introduced into the pickling tank from two storage tanks in a group of acid storage tanks at the same time for pickling test, and then flow back to one of the acid storage tanks. This design can conveniently switch pickling solutions when replacing pickling materials, avoiding waste of acid solution. It not only improves work efficiency but also avoids the corrosion failure problem of the temperature control heating device caused by long-term exposure to acidic liquid, thereby extending the service life of the equipment.

[0034] In addition, the waste liquid in the pickling tank and the acid storage tank will flow into the neutralization tank through a pipeline. The neutralization tank detects and adjusts the pH value of the waste liquid through a pH value detection component and an alkaline liquid dosing component to ensure that the waste liquid discharge meets environmental protection requirements. The aeration device accelerates the neutralization reaction, enabling the waste liquid to reach the discharge standard faster.

[0035] To sum up, the present utility model not only solves the problems of troublesome replacement and treatment of different acidic liquids during pickling, waste of acid solution, and easy failure of the temperature control heating device due to long-term immersion in acid solution during non-pickling operations, but also improves environmental protection and safety through effective treatment of waste liquid and waste gas, significantly improving the efficiency and effect of the pickling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of a specimen macroetching pickling device of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] In order to make the content of the present utility model easier to be clearly understood, the present utility model will be further described in detail below according to specific embodiments in conjunction with the drawings.

[0038] As Figure 1 shown, a specimen macroetching pickling device includes:

[0039] A sealed cabinet 1;

[0040] A pickling tank 2, the pickling tank 2 is arranged in the sealed cabinet 1, the pickling tank 2 is provided with a liquid inlet and a liquid outlet, and the pickling tank 2 is suitable for placing the pipe to be tested;

[0041] A set of acid storage tanks 3 are arranged inside the sealed cabinet 1. At least one acidic liquid is stored in different acid storage tanks 3 respectively. Each set of acid storage tanks 3 is provided with an independent liquid supply pipeline and a reflux pipeline;

[0042] One end of the liquid supply pipeline is communicated with the liquid outlet of the corresponding acid storage tank 3, and the other end is communicated with the liquid inlet of the pickling tank 2. One end of the reflux pipeline is communicated with the liquid inlet of the corresponding acid storage tank 3, and the other end is communicated with the liquid outlet of the pickling tank 2;

[0043] A temperature control heating device 4 is installed in the pickling tank 2. The temperature control heating device 4 is adapted to heat the acidic liquid in the pickling tank 2 to a preset temperature;

[0044] A neutralization tank 5 is arranged outside the sealed cabinet 1. The neutralization tank 5 is provided with a waste liquid inlet and a waste liquid outlet. The waste liquid inlet of the neutralization tank 5 is communicated with the pickling tank 2 and the acid storage tank 3 respectively;

[0045] The neutralization tank 5 is adapted to collect and neutralize the waste liquid discharged from the pickling tank 2 and the acid storage tank 3, and discharge it from the waste liquid outlet.

[0046] In this embodiment, as Figure 1 shown, during the use process, one of a set of acid storage tanks 3 can be selected, and a specific acidic liquid is introduced into the pickling tank 2 through the liquid supply pipeline. Subsequently, the temperature control heating device 4 is used to heat the acidic liquid. After the temperature reaches the preset value, it is maintained at a constant temperature state to conduct the pickling test of the pipe. After the pickling test is completed, the acidic liquid in the pickling tank 2 will flow back to the original acid storage tank 3 through the reflux pipeline. Then, when conducting the pickling test of another kind of pipe, another acid storage tank of the same set of acid storage tanks 3 can be used. This acid storage tank stores a mixed acidic liquid mixed with the previous acidic liquid. This mixed acidic liquid is introduced into the pickling tank 2 through the liquid supply pipeline to conduct a new round of pickling test. After pickling is completed, the acidic liquid flows back to the corresponding acid storage tank 3 through the reflux pipeline; in addition, according to the needs of different pipes, acidic liquids can also be introduced from two storage tanks in a set of acid storage tanks 3 into the pickling tank 2 at the same time for pickling test, and then flow back to one of the acid storage tanks 3. This design can conveniently switch the pickling solution when replacing the pickling material, avoiding the waste of acid solution. It not only improves the work efficiency, but also avoids the corrosion failure problem of the temperature control heating device 4 caused by long-term exposure to acidic liquid, thereby prolonging the service life of the equipment. The heating temperature of the temperature control heating device 4 is between 60°C and 100°C. For example, when pickling low alloy steel, a 1:1 hydrochloric acid aqueous solution can be used, and when performing macroetching of stainless steel, a 1:1 hydrochloric acid aqueous solution added with nitric acid can be used. A pump is provided on the liquid supply pipeline, and a valve is provided on the reflux pipeline.

[0047] Specifically, as Figure 1 shown, the temperature-controlled heating device 4 can have the following structure, including:

[0048] A heating element, which is arranged in the pickling tank 2 and is suitable for heating the acidic liquid entering the pickling tank 2;

[0049] A temperature sensor, which is installed in the pickling tank 2 and is suitable for detecting the temperature of the acidic liquid and sending out a temperature signal;

[0050] A thermostat, which is electrically connected to the temperature sensor and the heating element respectively, and is suitable for controlling the heating of the heating element according to the temperature signal collected by the temperature sensor.

[0051] In this embodiment, as Figure 1 shown, the heating element is directly installed in the pickling tank 2, and can quickly and effectively transfer heat to the acidic liquid. The temperature sensor monitors the liquid temperature in real time and transmits the temperature signal to the thermostat. The thermostat compares the received temperature signal with the preset temperature value, and automatically adjusts the working state of the heating element to achieve precise control of the temperature of the acidic liquid. The operation process of the temperature-controlled heating device 4 is as follows: when the acidic liquid is injected into the pickling tank 2, the thermostat receives the start signal and activates the heating element to start heating. The temperature sensor continuously monitors the liquid temperature and feeds back the temperature signal to the thermostat in real time. The thermostat adjusts the heating intensity of the heating element according to the difference between the preset temperature value and the current temperature. When the liquid temperature approaches the preset value, the thermostat will reduce the output power of the heating element to prevent the temperature from being too high. Once the preset temperature is reached, the thermostat will make the heating element enter the stop working state to maintain the constant temperature of the acidic liquid. The thermostat is a prior art. This embodiment will not elaborate on it.

[0052] Specifically, as Figure 1 shown, an acid-base neutralization device is provided in the neutralization tank 5, and the acid-base neutralization device can have the following structure, including:

[0053] A pH value detection component, which is installed in the neutralization tank 5 and is suitable for monitoring the pH value in the neutralization tank 5 and sending out a signal;

[0054] An alkaline liquid dispensing component, which is provided with a liquid outlet hole, and the liquid outlet hole is connected to the neutralization tank 5 through a pipeline;

[0055] A controller, which is electrically connected to the pH value detection component and the alkaline liquid dispensing component respectively, and is suitable for receiving the signal sent by the pH value detection component and controlling the alkaline liquid dispensing component according to the signal

[0056] In this embodiment, as Figure 1As shown, the pH value detection component continuously monitors the pH value in the neutralization tank 5 and transmits the data to the controller in real time. The controller determines whether to add alkaline liquid based on the received pH value signal and accordingly controls the operation of the alkaline liquid dispensing component. The working process of the neutralization device is as follows: When the acidic waste liquid enters the neutralization tank 5, the pH value detection component immediately starts to monitor the pH value of the liquid in the tank. If the detected pH value is lower than the preset threshold, the controller will start the alkaline liquid dispensing component and inject an appropriate amount of alkaline liquid into the neutralization tank 5 through the liquid outlet hole. As the alkaline liquid is continuously added, the pH value will gradually rise. The controller dynamically adjusts the dispensing amount of the alkaline liquid according to the change trend of the pH value until the pH value reaches the target range. In addition, a sewage pump is provided. When the waste liquid in the neutralization tank 5 is completely neutralized, the sewage pump extracts the treated waste liquid from the sewage outlet of the neutralization tank 5 through its water inlet. The water outlet of the sewage pump can be connected to a designated waste liquid collection system or a further treatment device. This not only ensures that the neutralization tank 5 can continuously receive new acidic waste liquid. In addition, a filtering device can be considered to be installed at the water inlet of the sewage pump to prevent large particle impurities from entering the pump body and extend its service life.

[0057] Specifically, as Figure 1 shown, the alkaline liquid dispensing component includes:

[0058] An alkaline liquid storage tank, which is arranged outside the sealed cabinet 1;

[0059] A metering pump, which has an inlet end and an outlet end. The inlet end of the metering pump is connected to the alkaline liquid storage tank, the outlet end of the metering pump is connected to the neutralization tank 5 through a pipeline, and the metering pump is electrically connected to the controller.

[0060] In this embodiment, as Figure 1 shown, the working process of the alkaline liquid dispensing component can be as follows: When the controller receives the signal from the pH value detection component and determines that alkaline liquid needs to be added, it will send a start command to the metering pump. The metering pump will then start working and extract a preset amount of alkaline liquid from the alkaline liquid storage tank. These liquids are transported to the neutralization tank 5 through the outlet end of the metering pump via the connecting pipeline. The controller can adjust the working frequency and single delivery volume of the metering pump in real time according to the change of the pH value, so as to achieve precise control of the alkaline liquid addition process.

[0061] Specifically, as Figure 1 shown, the low-power pickling device for samples further includes an aeration device, which is installed in the neutralization tank 5 and is suitable for generating gas to mix the alkaline liquid added in the neutralization tank 5.

[0062] In this embodiment, as Figure 1As shown, the aeration device generates bubbles in the neutralization tank 5, which can not only promote the full mixing of the alkaline liquid and the acidic waste liquid, but also increase the contact area between the liquid and the air, accelerating the progress of the neutralization reaction. This design significantly improves the neutralization efficiency and ensures more thorough waste liquid treatment. The working process of the aeration device can be as follows: When the acidic waste liquid enters the neutralization tank 5, the aeration device starts to operate and injects gas into the tank. The gas rises from the bottom of the tank in the form of bubbles, continuously agitating the liquid during the rising process, promoting the full mixing of the alkaline liquid and the acidic waste liquid. At the same time, the movement of the bubbles can also drive the liquid to circulate, avoiding the situation of abnormal local pH value. This continuous agitation and mixing process ensure the uniformity of the liquid in the entire neutralization tank 5, improving the efficiency and integrity of the neutralization reaction.

[0063] Specifically, as Figure 1 shown, the sample low-power pickling device further includes a cleaning tank 6. The cleaning tank 6 is arranged in the sealed cabinet 1, adjacent to the pickling tank 2, and the cleaning tank 6 is suitable for placing pipes.

[0064] The upper part of the cleaning tank 6 is provided with a water inlet, which is connected to an external water source. The cleaning tank 6 is suitable for transporting cleaning liquid into the cleaning tank 6 through the water inlet.

[0065] The lower part of the cleaning tank 6 is provided with a liquid discharge port, which is connected to the neutralization tank 5 through a pipeline. The cleaning tank 6 is suitable for discharging the waste liquid after cleaning through the liquid discharge port.

[0066] The cleaning tank 6 is suitable for cleaning and neutralizing the pipes after pickling treatment.

[0067] Specifically, the cleaning liquid input by the external water source is hot water.

[0068] In this embodiment, as Figure 1 shown, the cleaning tank 6 quickly transfers the pipes to the cleaning tank 6 for subsequent treatment after pickling treatment, effectively preventing further corrosion of the pipe surface by acidic residues. The operation process of the cleaning tank 6 can be as follows: First, the pipes after pickling treatment are placed in the cleaning tank 6. Then, hot water is transported into the cleaning tank 6 through the upper water inlet. As a cleaning liquid, hot water can not only effectively clean the acidic residues on the pipe surface, but also play a neutralizing role. The use of hot water can also accelerate the cleaning process and improve the cleaning efficiency. After cleaning, the waste liquid is discharged through the lower liquid discharge port and transported to the neutralization tank 5 for further treatment. The temperature of the hot water can be around 60 degrees.

[0069] Specifically, as Figure 1 shown, the sample low-power pickling device further includes an alkali washing tower 7, and the alkali washing tower 7 is installed outside the sealed cabinet 1;

[0070] The caustic scrubber 7 is provided with a gas collection port, and the gas collection port is connected to the inside of the sealed cabinet 1 through a pipeline. The caustic scrubber 7 is suitable for neutralizing the acidic waste gas collected from the sealed cabinet 1 and discharging it.

[0071] In this embodiment, as Figure 1 shown, the caustic scrubber 7 not only effectively treats the acidic waste gas generated during the pickling process, but also protects the environment and the safety of operators. The inside of the caustic scrubber 7 is filled with an alkaline solution. When the acidic waste gas in the sealed cabinet 1 enters the caustic scrubber 7 through the pipeline, it will undergo a neutralization reaction with the alkaline solution. This process can effectively remove the harmful components in the waste gas and ensure that the discharged gas meets the environmental protection standards. The operation process of the caustic scrubber 7 is as follows: First, the acidic waste gas generated in the sealed cabinet 1 is introduced into the bottom of the caustic scrubber 7 through the connecting pipeline. Subsequently, the waste gas flows upward in the tower and comes into full contact with the alkaline solution flowing downward. During this process, the acidic substances are neutralized and the harmful components in the gas are removed. Finally, the treated gas is discharged from the top of the caustic scrubber 7. To ensure the treatment effect, the alkaline solution in the caustic scrubber 7 can be regularly inspected and replaced.

[0072] In the specific embodiments described above, the technical problems solved, the technical solutions adopted, and the beneficial effects of the present utility model are further described in detail. It should be understood that the above description is only for the specific embodiments of the present utility model and does not limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A sample low-magnification pickling device, characterized in that: include: Sealing cabinet (1); A pickling tank (2), the pickling tank (2) being arranged in the sealed cabinet (1), the pickling tank (2) being provided with a liquid inlet and a liquid outlet, and the pickling tank (2) being suitable for placing the pipe to be tested; At least one group of acid storage tanks (3), wherein the acid storage tanks (3) are arranged inside the sealed cabinet (1), different acid storage tanks (3) respectively store at least one acidic liquid, and each group of acid storage tanks (3) is respectively provided with an independent liquid supply pipeline and a return pipeline; One end of the liquid supply pipeline is connected to the liquid outlet of the corresponding acid storage tank (3), and the other end is connected to the liquid inlet of the pickling tank (2); one end of the reflux pipeline is connected to the liquid inlet of the corresponding acid storage tank (3), and the other end is connected to the liquid outlet of the pickling tank (2); A temperature control heating device (4), the temperature control heating device (4) being installed in the pickling tank (2), the temperature control heating device (4) being suitable for heating the acidic liquid in the pickling tank (2) to a preset temperature; A neutralization tank (5), wherein the neutralization tank (5) is arranged outside the sealed cabinet (1), and a waste liquid inlet and a waste liquid outlet are provided on the neutralization tank (5), and the waste liquid inlet of the neutralization tank (5) is respectively connected to the pickling tank (2) and the acid storage tank (3); The neutralization tank (5) is suitable for collecting and neutralizing the waste liquid discharged from the pickling tank (2) and the acid storage tank (3), and discharging it from the waste liquid outlet.

2. The sample low-magnification pickling device according to claim 1 is characterized in that: The temperature control and heating device (4) comprises: a heating element, the heating element being arranged in the pickling tank (2), the heating element being suitable for heating the acidic liquid entering the pickling tank (2); A temperature sensor, the temperature sensor being installed in the pickling tank (2), the temperature sensor being suitable for detecting the temperature of the acidic liquid and sending a temperature signal; A temperature controller is electrically connected to the temperature sensor and the heating element respectively, and is suitable for controlling the heating of the heating element according to the temperature signal collected by the temperature sensor.

3. The sample low-magnification pickling device according to claim 1 is characterized in that: The neutralization tank (5) is provided with an acid-base neutralization device, and the acid-base neutralization device comprises: A pH value detection component, the pH value detection component is installed in the neutralization tank (5), and the pH value detection component is suitable for monitoring the pH value in the neutralization tank (5) and sending a signal; An alkaline liquid delivery component, the alkaline liquid delivery component being provided with a liquid outlet, the liquid outlet being connected to the neutralization tank (5) through a pipeline; A controller is electrically connected to the pH value detection component and the alkaline liquid delivery component respectively, and the controller is suitable for receiving a signal sent by the pH value detection component and controlling the alkaline liquid delivery component to add alkaline liquid into the neutralization tank (5) according to the signal.

4. The sample low-magnification pickling device according to claim 3 is characterized in that: The alkaline liquid delivery component comprises: an alkaline liquid storage tank, the alkaline liquid storage tank being arranged outside the sealed cabinet (1); A metering pump is provided with a liquid inlet and a liquid outlet, the liquid inlet of the metering pump is connected to the alkaline liquid storage tank, the liquid outlet of the metering pump is connected to the neutralization tank (5) through a pipeline, and the metering pump is electrically connected to the controller.

5. The sample low-magnification pickling device according to claim 3 is characterized in that: It also comprises an aeration device, which is installed in the neutralization tank (5) and is suitable for generating gas to mix the alkaline liquid added in the neutralization tank (5).

6. The sample low-magnification pickling device according to claim 1 is characterized in that: It also comprises a cleaning tank (6), wherein the cleaning tank (6) is arranged in the sealed cabinet (1) and is adjacent to the pickling tank (2), and the cleaning tank (6) is suitable for placing pipes; The cleaning tank (6) is provided with a water inlet at the top, the water inlet is connected to an external water source, and the cleaning tank (6) is suitable for conveying cleaning liquid into the cleaning tank (6) through the water inlet; The cleaning tank (6) is provided with a drain port at the bottom thereof, the drain port being connected to the neutralization tank (5) via a pipeline, and the cleaning tank (6) is suitable for discharging the waste liquid after cleaning through the drain port; The cleaning tank (6) is suitable for cleaning and neutralizing the pipe after the pickling treatment.

7. The sample low-magnification pickling device according to claim 6, characterized in that: The cleaning liquid input from the external water source is hot water.

8. The sample low-magnification pickling device according to claim 1 is characterized in that: It also includes an alkali washing tower (7), wherein the alkali washing tower (7) is installed outside the sealed cabinet (1); The alkali washing tower (7) is provided with a gas collecting port, and the gas collecting port is connected to the inside of the sealed cabinet (1) through a pipeline. The alkali washing tower (7) is suitable for neutralizing and discharging the acidic waste gas collected from the sealed cabinet (1).

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