Acid liquor circulating pickling device, pickling liquor and pickling method

Abstract

The invention relates to an acid liquor circulation pickling device, a pickling solution and a pickling method, and belongs to the technical field of low-alloy heavy rail steel continuous casting billet macrostructure detection devices and methods. According to the technical scheme, the left side of a pickling tank box body (1) is connected with an acid liquid circulating system (4) through a liquid inlet pipeline (5) and a liquid discharging pipeline (3), a cover body (8) is movably arranged above the pickling tank box body (1), the lower portion of the cover body (8) is connected with a metal containing frame (2), a hoisting mechanism (7) is arranged on the right side of the pickling tank box body (1), and a heater is installed at the bottom of the pickling tank box body (1). The device has the beneficial effects that impurities on the surface of a workpiece are more effectively removed, meanwhile, the liquid inlet pipeline and the liquid discharging pipeline are connected with the acid liquid circulating system, the acid liquid recycling and recirculating effect is achieved, energy saving and environmental protection are achieved, manpower resources are effectively saved, the working efficiency is improved, the efficiency of the pickling pool is improved, and the pickling process is more accurate, efficient, safe and stable.

Description

Technical Field

[0001] The invention relates to an acid liquid circulation pickling device, pickling liquid and a pickling method, and belongs to the technical field of low-alloy heavy rail steel continuous casting slab macrostructure detection devices and methods. Background Art

[0002] Pickling is a treatment process that removes oxides, rust or other impurities on the surface of steel, making the surface of the workpiece cleaner and smoother. It can remove oxides, improve surface finish, enhance surface adhesion, and improve corrosion resistance. Pickling is an important production process that can improve metal surface quality and material performance.

[0003] In general pickling tanks, the acid is static during the pickling process. The acid concentration at the lower end of the workpiece will be higher than that at the upper end of the workpiece, which will cause uneven corrosion of the workpiece, uneven pickling or excessive corrosion. Common stirring devices do not significantly improve the pickling effect due to space limitations and low stirring power of the pickling tank.

[0004] At present, pickling technology has become one of the most widely used surface pretreatment methods in the steel manufacturing industry, especially in hot rolling production lines. Traditional pickling tanks are mainly completed by manual operation, which has problems such as difficult process, complex operation, low efficiency and poor safety. Summary of the invention

[0005] The purpose of the present invention is to provide an acid liquid circulation pickling device, a pickling liquid and a pickling method. A liquid inlet is arranged at the bottom of the pickling tank box, and the acid liquid flows out from the bottom to the top through the liquid inlet, so as to more effectively remove impurities on the surface of the workpiece. At the same time, a liquid inlet pipe and a liquid discharge pipe are connected with the acid liquid circulation system to achieve the effect of acid liquid recovery and recycling, which is energy-saving and environmentally friendly, effectively saves human resources and improves work efficiency, improves the efficiency of the pickling tank, makes the pickling process more accurate, efficient, safe and stable, and effectively solves the above-mentioned problems existing in the background technology.

[0006] The technical solution of the present invention is: an acid circulation pickling device, comprising a pickling tank box, a metal placement rack, a heater, an acid circulation system, a hoisting mechanism and a cover body, wherein the left side of the pickling tank box is connected to the acid circulation system through a liquid inlet pipe and a liquid discharge pipe, the cover body is movably arranged above the pickling tank box, the metal placement rack is connected below the cover body, the hoisting mechanism is arranged on the right side of the pickling tank box, and the heater is installed at the bottom of the pickling tank box; The acid circulation system includes an acid storage device and a filtering device. The liquid inlet pipe is located at the lower left side of the pickling tank body, one end of which is connected to the acid storage device, and the other end is connected to the bottom of the pickling tank body through the liquid inlet. The liquid discharge pipe is located at the upper left side of the pickling tank body and is connected to the filtering device. The hoisting mechanism includes a boom, a rotating motor, a control panel and a rotating base. The rotating motor is arranged in the control panel, which is connected to the rotating base. The rotating base is connected to a rotating column and a hydraulic telescopic rod. The rotating column is connected to the boom, and the hydraulic telescopic rod is arranged at the lower part of the rotating column.

[0007] It also comprises a sliding device, in which a progressive motor is arranged, and the sliding device is driven by the progressive motor to slide on the boom; the bottom of the sliding device is connected with a magnetic suction cup through a steel wire rope.

[0008] The boom is provided with a slide groove, and the sliding device is installed in the slide groove.

[0009] The liquid inlet pipeline is provided with a switch valve and a pressure pump.

[0010] There are four liquid inlets.

[0011] The filtering device comprises a filter element and a filter screen.

[0012] The cover body is provided with a hook, and the cover body is connected with the metal placement frame through the hook, and a metal supporting isolation plate is provided at the bottom of the metal placement frame.

[0013] A metal tempered glass is arranged at the center of the cover body, and a sealing strip is arranged around the lower end of the cover body; the cover body is connected with the pickling tank box body through a second hydraulic telescopic rod.

[0014] An acid circulation pickling acid solution, wherein the volume ratio of hydrochloric acid to aqueous solution is 1:1, and further comprises 1-5% picric acid, 1-5% nitric acid, 1-5% hydrogen peroxide and 1-5% sodium dodecyl sulfate.

[0015] The conditions for adding the picric acid, nitric acid, hydrogen peroxide and sodium dodecyl sulfate are that the hydrochloric acid aqueous solution is heated to above 70 degrees.

[0016] An acid solution circulating pickling method comprises the following steps: Step 1: Control the lifting mechanism to adsorb the workpiece through the magnetic chuck, rotate the lifting mechanism so that the workpiece is located directly above the pickling tank box, control the length of the wire rope to lower the magnetic chuck, and control the magnetic chuck to place the workpiece in the center of the metal placement rack; Step 2: After placing the workpiece, lift the magnetic chuck and rotate the lifting mechanism; Step 3: Push down the second hydraulic telescopic rod connected to the cover body to seal the cover body and the pickling tank, and at the same time, the workpiece on the metal placement rack drops down to below the liquid level of the drainage pipe; Step 4: Open the switch valve of the liquid inlet pipeline, set the acid type, acid concentration and acid discharge flow rate in the pickling control system, and set the heating temperature of the pickling tank box; Step 5: Observe the pickling state of the workpiece through the metal tempered glass of the cover, adjust the pickling parameters in time, and after the pickling state of the workpiece reaches the standard, close the acid circulation system. After the acid is emptied, push up the second hydraulic telescopic rod connected to the cover, and the workpiece on the metal placement rack will rise accordingly; Step 6: Rotate the lifting mechanism, lower the magnetic chuck to absorb the workpiece, take it out and place it in the designated location; Step 7: Repeat the above steps to pickle the next workpiece.

[0017] The drainage pipe on the left side of the pickling tank body is connected to the upper part of the acid circulation system. When the acid liquid level rises to a position level with the drainage pipe, the liquid level stops rising and is discharged through the drainage pipe. The diameter of the drainage pipe is set to match the flow rate of the acid liquid.

[0018] The beneficial effects of the present invention are as follows: a liquid inlet is arranged at the bottom of the pickling tank body, and the acid flows out from the bottom upward through the liquid inlet, so that impurities on the surface of the workpiece are more effectively removed. At the same time, a liquid inlet pipe and a liquid discharge pipe are connected to the acid circulation system to achieve the effect of acid recovery and recycling, which is energy-saving and environmentally friendly, effectively saves human resources and improves work efficiency, improves the efficiency of the pickling tank, and makes the pickling process more accurate, efficient, safe and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; In the figure: pickling tank box 1, metal placement rack 2, drainage pipe 3, acid circulation system 4, liquid inlet pipe 5, liquid inlet 6, lifting mechanism 7, cover 8. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the invention implementation cases clearer, the technical solutions in the implementation cases of the present invention will be clearly and completely described below in conjunction with the drawings in the implementation cases. Obviously, the implementation cases described are only a small part of the implementation cases of the present invention, rather than all the implementation cases. Based on the implementation cases in the present invention, all other implementation cases obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] An acid circulation pickling device comprises a pickling tank box 1, a metal placing rack 2, a heater, an acid circulation system 4, a hoisting mechanism 7 and a cover 8, wherein the left side of the pickling tank box 1 is connected to the acid circulation system 4 through a liquid inlet pipe 5 and a liquid discharge pipe 3, the cover 8 is movably arranged above the pickling tank box 1, the metal placing rack 2 is connected below the cover 8, the hoisting mechanism 7 is arranged on the right side of the pickling tank box 1, and the heater is installed at the bottom of the pickling tank box 1; The acid circulation system 4 includes an acid storage device and a filtering device. The liquid inlet pipe 5 is located at the lower left side of the pickling tank body 1, one end of which is connected to the acid storage device, and the other end is connected to the bottom of the pickling tank body 1 through the liquid inlet 6. The liquid discharge pipe 3 is located at the upper left side of the pickling tank body 1 and is connected to the filtering device. The hoisting mechanism 7 includes a boom, a rotating motor, a control console and a rotating base. The rotating motor is arranged in the control console, the control console is connected to the rotating base, the rotating base is connected to a rotating column and a hydraulic telescopic rod, the rotating column is connected to the boom, and the hydraulic telescopic rod is arranged at the lower part of the rotating column.

[0022] It also comprises a sliding device, in which a progressive motor is arranged, and the sliding device is driven by the progressive motor to slide on the boom; the bottom of the sliding device is connected with a magnetic suction cup through a steel wire rope.

[0023] The boom is provided with a slide groove, and the sliding device is installed in the slide groove.

[0024] The liquid inlet pipeline 5 is provided with a switch valve and a pressure pump.

[0025] There are four liquid inlets 6 .

[0026] The filtering device comprises a filter element and a filter screen.

[0027] The cover body 8 is provided with a hook, and the cover body 8 is connected to the metal placement rack 2 through the hook. The bottom of the metal placement rack 2 is provided with a metal support isolation plate.

[0028] The center of the cover body 8 is provided with metal tempered glass, and a sealing strip is provided around the lower end of the cover body 8; the cover body 8 is connected to the pickling tank box body 1 through a hydraulic telescopic rod 2.

[0029] An acid circulation pickling acid solution, wherein the volume ratio of hydrochloric acid to aqueous solution is 1:1, and further comprises 1-5% picric acid, 1-5% nitric acid, 1-5% hydrogen peroxide and 1-5% sodium dodecyl sulfate.

[0030] The conditions for adding the picric acid, nitric acid, hydrogen peroxide and sodium dodecyl sulfate are that the hydrochloric acid aqueous solution is heated to above 70 degrees.

[0031] An acid solution circulating pickling method comprises the following steps: Step 1: Control the lifting mechanism to adsorb the workpiece through the magnetic chuck, rotate the lifting mechanism so that the workpiece is located directly above the pickling tank box, control the length of the wire rope to lower the magnetic chuck, and control the magnetic chuck to place the workpiece in the center of the metal placement rack; Step 2: After placing the workpiece, lift the magnetic chuck and rotate the lifting mechanism; Step 3: Push down the second hydraulic telescopic rod connected to the cover body to seal the cover body and the pickling tank, and at the same time, the workpiece on the metal placement rack drops down to below the liquid level of the drainage pipe; Step 4: Open the switch valve of the liquid inlet pipeline, set the acid type, acid concentration and acid discharge flow rate in the pickling control system, and set the heating temperature of the pickling tank box; Step 5: Observe the pickling state of the workpiece through the metal tempered glass of the cover, adjust the pickling parameters in time, and after the pickling state of the workpiece reaches the standard, close the acid circulation system. After the acid is emptied, push up the second hydraulic telescopic rod connected to the cover, and the workpiece on the metal placement rack will rise accordingly; Step 6: Rotate the lifting mechanism, lower the magnetic chuck to absorb the workpiece, take it out and place it in the designated location; Step 7: Repeat the above steps to pickle the next workpiece.

[0032] The drainage pipe on the left side of the pickling tank body is connected to the upper part of the acid circulation system. When the acid liquid level rises to a position level with the drainage pipe, the liquid level stops rising and is discharged through the drainage pipe. The diameter of the drainage pipe is set to match the flow rate of the acid liquid.

[0033] In practical applications, the acid solution formula is based on volume, with a volume ratio of hydrochloric acid to aqueous solution of 1:1. In addition, 1~5% picric acid, 1~5% nitric acid, 1~5% hydrogen peroxide, and 1~5% sodium dodecyl sulfate are added. The hydrochloric acid aqueous solution needs to be heated to above 70 degrees, and picric acid, nitric acid, hydrogen peroxide and sodium dodecyl sulfate are added in sequence and stirred evenly.

[0034] According to the workpiece material, the surface state of the workpiece and the pickling requirements, the pickling time, the concentration of the acid solution and the pickling temperature are determined, and the pickling parameters are input through the acid circulation system. The hoisting mechanism 7 realizes the rotation of the hoisting mechanism by controlling the rotating base and the rotating column, and can realize the lateral movement of the sliding device on the boom by controlling the hydraulic telescopic rod and the progressive motor, and realizes the adsorption of the workpiece through the magnetic suction cup, the pulley and the wire rope. The size of the magnetic suction cup matches the size and weight of the workpiece and the maximum weight that the wire rope can bear. By controlling the hoisting mechanism, the operator can place the workpiece on the metal placement rack 2 without contact.

[0035] The cover 8 of the pickling tank is connected to the pickling tank box 1 through a hydraulic telescopic rod 2, and the metal placement rack 2 is connected to the lower end of the cover 8 through a hook. A metal tempered glass is provided in the center of the cover 8 to facilitate observation of the pickling status of the workpiece at any time. A sealing strip is provided around the lower end of the cover to prevent splashing of acid and volatilization of acidic gas.

[0036] The pickling tank box 1 is a container body of the present invention, which can accommodate pickling liquid and workpieces, and can be configured with a variety of components. The bottom of the pickling tank box 1 is provided with a liquid inlet 6, and there are multiple liquid inlets 6, which can effectively improve the contact efficiency between the acid and the workpiece, and avoid pickling dead corners to a certain extent. The liquid inlet 6 is connected to the acid circulation system 4 through a liquid inlet pipe 5 with a switch valve, which is convenient for closing the discharge of the acid at any time or in an emergency.

[0037] The inlet pipe 5 and the discharge pipe 3 are connected to the acid circulation system 4 located on the left side of the pickling tank box. The acid circulation system 4 includes an acid storage device and a filter device. The acid storage device discharges the acid into the pickling tank box 1 through a pressure pump. The advantage is that the acid pickling state of the workpiece can be observed, and the control console can be controlled to achieve real-time acid flow rate and acid concentration adjustment. The filter device filters out impurities in the acid through a filter element and a filter net, and the filtered acid flows back to the acid storage device, which can achieve the recycling of the acid. The discharge pipe 3 on the left side of the pickling tank box is connected to the upper part of the acid circulation system 4. When the acid level rises to a position level with the discharge pipe 3, the liquid level will not rise again, and the acid will be discharged through the discharge pipe 3. It should be noted that the flow rate of the acid should match the diameter of the discharge pipe 3 to prevent the acid flow rate from being too fast, causing the acid level to continue to rise, thereby causing the acid to overflow.

[0038] The patent of the present invention is described above. Any modifications, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An acid liquid circulation pickling device, characterized in that: It comprises a pickling tank box (1), a metal placement rack (2), a heater, an acid liquid circulation system (4), a lifting mechanism (7) and a cover (8), wherein the left side of the pickling tank box (1) is connected to the acid liquid circulation system (4) via a liquid inlet pipe (5) and a liquid discharge pipe (3), the cover (8) is movably arranged above the pickling tank box (1), the bottom of the cover (8) is connected to the metal placement rack (2), the lifting mechanism (7) is arranged on the right side of the pickling tank box (1), and the heater is installed at the bottom of the pickling tank box (1); The acid liquid circulation system (4) comprises an acid liquid storage device and a filtering device. The liquid inlet pipe (5) is located at the lower left side of the pickling tank housing (1), one end of which is connected to the acid liquid storage device, and the other end of which is connected to the bottom of the pickling tank housing (1) through a liquid inlet (6). The liquid discharge pipe (3) is located at the upper left side of the pickling tank housing (1) and is connected to the filtering device. The hoisting mechanism (7) comprises a boom, a rotating motor, a control panel and a rotating base, wherein the rotating motor is arranged in the control panel, the control panel is connected to the rotating base, the rotating base is connected to a rotating column and a hydraulic telescopic rod, the rotating column is connected to the boom, and the hydraulic telescopic rod is arranged at the lower part of the rotating column.

2. The acid solution circulating pickling device according to claim 1 is characterized in that: It also comprises a sliding device, in which a progressive motor is arranged, and the sliding device is driven by the progressive motor to slide on the boom; the bottom of the sliding device is connected with a magnetic suction cup through a steel wire rope.

3. An acid solution circulating pickling device according to claim 2, characterized in that: The boom is provided with a slide groove, and the sliding device is installed in the slide groove.

4. The acid solution circulating pickling device according to claim 1 is characterized in that: The liquid inlet pipeline (5) is provided with a switch valve and a pressure pump.

5. The acid solution circulating pickling device according to claim 1 is characterized in that: The cover body (8) is provided with a hook, and the cover body (8) is connected to the metal placement rack (2) via the hook, and a metal support isolation plate is provided at the bottom of the metal placement rack (2).

6. The acid solution circulating pickling device according to claim 1, characterized in that: A metal tempered glass is provided at the center of the cover body (8), and a sealing strip is provided around the lower end of the cover body (8); the cover body (8) is connected to the pickling tank box (1) via a second hydraulic telescopic rod.

7. An acid recycling pickling acid solution, characterized in that: The volume ratio of hydrochloric acid to aqueous solution is 1:1, and it also contains 1~5% picric acid, 1~5% nitric acid, 1~5% hydrogen peroxide and 1~5% sodium dodecyl sulfate.

8. The acid circulation pickling acid solution according to claim 7, characterized in that: The conditions for adding the picric acid, nitric acid, hydrogen peroxide and sodium dodecyl sulfate are that the hydrochloric acid aqueous solution is heated to above 70 degrees.

9. An acid solution circulating pickling method, characterized in that The following steps are involved: Step 1: Control the lifting mechanism to adsorb the workpiece through the magnetic chuck, rotate the lifting mechanism so that the workpiece is located directly above the pickling tank box, control the length of the wire rope to lower the magnetic chuck, and control the magnetic chuck to place the workpiece in the center of the metal placement rack; Step 2: After placing the workpiece, lift the magnetic chuck and rotate the lifting mechanism; Step 3: Push down the second hydraulic telescopic rod connected to the cover body to seal the cover body and the pickling tank, and at the same time, the workpiece on the metal placement rack drops down to below the liquid level of the drainage pipe; Step 4: Open the switch valve of the liquid inlet pipeline, set the acid type, acid concentration and acid discharge flow rate in the pickling control system, and set the heating temperature of the pickling tank box; Step 5: Observe the pickling state of the workpiece through the metal tempered glass of the cover, adjust the pickling parameters in time, and after the pickling state of the workpiece reaches the standard, close the acid circulation system. After the acid is emptied, push up the second hydraulic telescopic rod connected to the cover, and the workpiece on the metal placement rack will rise accordingly; Step 6: Rotate the lifting mechanism, lower the magnetic chuck to absorb the workpiece, take it out and place it in the designated location; Step 7: Repeat the above steps to pickle the next workpiece.

10. An acid solution circulating pickling method according to claim 9, characterized in that: The drainage pipe on the left side of the pickling tank body is connected to the upper part of the acid circulation system. When the acid liquid level rises to a position level with the drainage pipe, the liquid level stops rising and is discharged through the drainage pipe. The diameter of the drainage pipe is set to match the flow rate of the acid liquid.

Images