CN115772673B - Pickling bath circulation pickling device and method - Google Patents

Abstract

The invention provides a circulating pickling device and a circulating pickling method for a pickling tank, which relate to the technical field of pickling, wherein an opening is formed in the top end of the pickling tank; the movable rail is used for installing a hanging piece frame, a hydraulic cylinder is connected to the movable rail in a sliding mode, the hanging piece frame is rotationally connected with the bottom of the hydraulic cylinder, an auxiliary transmission plate is arranged between the movable rail, the hydraulic cylinder is installed at the bottom end of the auxiliary transmission plate, a transfer rod is rotationally connected to the bottom of the hydraulic cylinder, and the position of an acid-washing workpiece is transferred through the transfer rod.

Description

Pickling bath circulation pickling device and method

Technical Field

The invention belongs to the technical field of pickling, and particularly relates to a circulating pickling device and method of a pickling tank.

Background

For the wire rod, whether the wire rod is a hot rolled wire rod or a semi-finished steel wire after heat treatment, the surface of the wire rod is provided with a hard and brittle iron oxide skin layer, and the iron oxide skin layers influence the subsequent processing procedures on one hand, so that the lubricating coating cannot be firmly combined with the steel substrate; on the other hand, during drawing, the surface of the die and the steel wire can be scratched because the iron scale has high hardness and is relatively brittle; the iron oxide leather is clamped between the die and the steel wire, so that friction between the steel wire and the die is increased, friction force is increased, and wire breakage is caused when the friction force is severe; sometimes iron oxide skins may be pressed into the steel wire matrix, resulting in defects such as "fin skins" during coating, and therefore, these iron oxide skins must be removed before the steel wire is drawn, and thus, pickling is performed before other processes are performed on the steel wire.

The utility model discloses a belted steel pickling equipment as in the publication No. CN211445916U, relates to belted steel pickling technique, and it includes frame, the pickling tank that sets up in the frame and the transfer roller of rotating frame in the frame, the transfer roller is located the top of pickling tank, be provided with the stop device that is used for restricting belted steel swing range in the frame, stop device is located the top of transfer roller.

The invention discloses a full-automatic sealed acid liquor circulation pickling tank, which comprises a pickling tank body and a steel pipe pickling rack, wherein two clamping blocks are symmetrically fixed on the inner walls of two sides of the pickling tank, clamping buckles are fixed on the corresponding positions of two sides of the steel pipe pickling rack, and the clamping buckles are clamped with the clamping blocks.

The existing pickling tank is only provided with one pickling area, so that peracid or underacid is easy to occur, and if iron oxide skin layers are thrown and remained on the surface of a workpiece after pickling, the workpiece needs to be returned to the pickling tank for pickling, so that the problem is solved by adopting a pickling tank provided with a plurality of pickling areas.

Disclosure of Invention

The invention aims to provide a circulating pickling device and a circulating pickling method for a pickling tank, which can be used for pickling in different pickling areas without influencing the concentration of pickling solution in the different areas.

A pickling tank circulation pickling device comprising:

the top end of the pickling tank is provided with an opening, an upper pickling tank and a lower pickling tank are arranged in the pickling tank, the lower pickling tank is divided into a first weak acid area, a second weak acid area, a wire turning area, a medium acid area and a strong acid area through a partition board, and hanging pieces are respectively arranged above the upper pickling tank and the lower pickling tank and used for hanging pickling workpieces;

the automatic acid pickling device comprises a movable rail, a pendant frame, a hydraulic cylinder, an auxiliary transmission plate, a transfer rod and an acid pickling workpiece, wherein the movable rail is used for installing the pendant frame, the hydraulic cylinder is connected to the movable rail in a sliding manner, the pendant frame is rotationally connected with the bottom of the hydraulic cylinder, the auxiliary transmission plate is arranged between the movable rail and the movable rail, the hydraulic cylinder is installed at the bottom of the auxiliary transmission plate, and the transfer rod is rotationally connected to the bottom of the hydraulic cylinder and used for transferring the position of the acid pickling workpiece.

Further, the upper pickling tank and the lower pickling tank are distributed in a staggered manner from top to bottom and from left to right, and an intermediate supporting plate is arranged in the pickling tank and used for bearing the upper pickling tank.

Further, be equipped with the T-shaped groove in the removal track, install electronic slide rail slide in the T-shaped groove, the carousel is installed to electronic slide rail slide bottom, hydraulic cylinder installs on the carousel, hydraulic cylinder's telescopic link's bottom is equipped with the swinging arms, and swinging arms is connected with the oscillating axle in the swinging arms internal rotation, pendant frame one end is installed on the oscillating axle, and oscillating axle one end has the motor, and motor drive oscillating axle is rotatory, and the pendant frame is rotatory along with the oscillating axle, and when the pendant frame was put up the pendulum, the pickling work was carried out to the pickling work piece, when the pendant frame lower hem, the cooperation shifts the position of pole transfer pickling work piece.

Further, the pendant frame symmetry sets up on the hydraulic cylinder with remove rail coupling, and the interval evenly has set up the spacing groove on the pendant frame for the position of restriction pickling work piece, the pole body of transfer pole be smooth surface, with the carousel is also installed on the hydraulic cylinder top that the transfer pole is connected, and the transfer pole symmetry sets up on the hydraulic cylinder that is connected with auxiliary drive board, and the structure of the hydraulic cylinder that is connected with the transfer pole is the same with the structure of the hydraulic cylinder that is connected with the pendant frame, adjacent the shortest distance is less than the diameter of pickling work piece between transfer pole and the pendant frame.

Further, install the division board in the first weak acid district, the division board top is filled with the pickling solution, and the below of division board is equipped with the transfer jar, transfer jar one end has connect the liquid suction pipe, and the other end has the feed liquor pipe, be equipped with the leakage fluid dram on the division board, the entrance point of liquid suction pipe is located in the leakage fluid dram, the exit end of feed liquor pipe is located the division board top, the division board is located the intermediate position in first weak acid district.

Further, the structures of the second weak acid area, the medium acid area and the strong acid area are the same as those of the first weak acid area, the partition plate is provided with a locking door, the locking door is hinged with the partition plate, the locking door is provided with a handle, when the handle is manually lifted, the locking door is opened, and when the handle is released, the locking door is closed.

Further, still be equipped with the preliminary treatment district in the lower pickling tank, be equipped with the subregion board in the preliminary treatment district, be equipped with the through-hole on the subregion board, the subregion board is distinguished the preliminary treatment and is divided into dry district and washing district, and the washing district is located the below of subregion board, and dry district is located the top of subregion board, has annotated the mixed solution in the washing district, and the mixed solution is water, installs in the dry district and scrapes the water subassembly.

Further, the wiper assembly is installed on the center rod, the center rod bottom is connected with the bracing piece, and the installation contained angle of center rod and bracing piece is greater than 90, the bracing piece other end is installed on the thrust plate, and the inner wall of preliminary treatment district is equipped with holds the chamber, and the thrust plate is located holds the intracavity, hold chamber one end and establish to the open end, and the apron is installed to the open end, is equipped with hydraulic push rod on the apron, and the hydraulic push rod other end is connected with the thrust plate, hold the chamber opposite side and be equipped with a plurality of grooves that slide, hydraulic push rod makes the slip board remove along the groove that slides when holding the intracavity, still the cover is equipped with the subassembly that absorbs water on the wiper assembly.

Further, the upper pickling tank is internally provided with a strong acid zone, a pretreatment zone, a medium acid zone, a pretreatment zone, a second weak acid zone, a pretreatment zone, a first weak acid zone and a pretreatment zone in sequence from left to right.

The invention further provides a method for the pickling tank circulating pickling device based on the pickling tank circulating pickling device, which comprises the following steps of:

step one: the pickling tank is used for pickling, the hanger is positioned right above the first weak acid area, and the hydraulic cylinder pushes down the hanger, so that the pickled workpiece is immersed into the pickling solution for preliminary pickling;

step two: the hydraulic cylinder pulls up the hanger, the electric sliding rail slide seat moves on the moving rail, and after the hanger moves to the position right above the pretreatment area, the hanger moves down, so that the hanger is immersed in the mixed liquid and then lifted up;

step three: the pickling workpiece is stopped after moving to a drying area, and the symmetrically arranged wiper assemblies move oppositely after extruding the surface of the pickling workpiece;

step four: the hanging rack continues to move upwards, the electric sliding rail sliding seat continues to drive the hanging rack to move above the second weak acid area, and the steps are repeated;

step five: and the hydraulic cylinder pulls up the hanging rack, the hanging rack right above the lower pickling tank is higher than the hanging rack of the upper pickling tank, the pickling workpiece right above the lower pickling tank is transferred to the upper part of the upper pickling tank by matching with the transfer rod, and the pickling is continuously repeated for the second pickling.

The beneficial effects of the invention are as follows:

the upper pickling tank and the lower pickling tank are arranged in the pickling tank, so that the pickling tank has various different working states, the upper pickling tank and the lower pickling tank work respectively to realize the pickling of pickled workpieces, the lower pickling tank performs first-round pickling on the workpieces, and if the workpieces subjected to the first-round pickling do not reach the pickling standard, the two-round pickling is continuously performed through the upper pickling tank, so that the pickling effect is ensured.

The concentration of the pickling solution in the lower pickling tank of one-round pickling can be ensured, and the pickling concentration of the pickling solution is easily influenced when the lower pickling tank is directly used for two-round pickling.

A pretreatment area is arranged between the pickling areas, and the pickling solution of the last pickling process remained on the steel wire coil is removed through the pretreatment area, so that the pickling concentration of each pickling solution is ensured.

The acid washing area is also internally provided with a transfer tank, so that acid washing solution can be timely supplemented or replaced, and the acid washing efficiency is improved.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:

FIG. 1 is a schematic diagram of the front view of the present invention;

FIG. 2 is a schematic left-hand view of the present invention;

FIG. 3 is a schematic diagram of a left-hand construction of a mobile track according to the present invention;

FIG. 4 is a schematic cross-sectional view of a travel track of the present invention;

FIG. 5 is a schematic diagram showing the transfer state structure of the pickled workpiece according to the present invention;

FIG. 6 is a schematic diagram showing the structure of the first weak acid region of the present invention in front view;

FIG. 7 is a schematic top view of the partition plate of the present invention;

FIG. 8 is a schematic diagram of the front view of the pretreatment area of the present invention;

FIG. 9 is a schematic view of a front view of a wiper assembly of the present invention;

FIG. 10 is a schematic view of a left side view of a wiper assembly of the present invention;

FIG. 11 is a schematic diagram of the front view of the upper pickling tank of the present invention.

Marked in the figure as:

1. feeding a pickling tank; 2. a pickling tank; 3. a first weak acid region; 4. a mixed solution; 5. a second weak acid region; 6. a wire turning area; 7. a medium acid zone; 8. a strong acid zone; 9. an intermediate support plate; 10. a moving track; 11. an auxiliary transmission plate; 12. a lower pickling tank; 14. a liquid inlet pipe; 15. a transfer tank; 16. a partition plate; 17. a liquid suction pipe; 18. locking the door; 19. a handle; 20. a liquid outlet; 21. a through hole; 22. a cover plate; 23. a drying zone; 24. a cavity; 25. a slip groove; 26. a cleaning zone; 27. a support rod; 28. a pushing plate; 29. a wiper assembly; 30. a central rod; 31. a hydraulic push rod; 32. pickling a workpiece; 33. a water absorbing component; 34. a swing shaft; 35. a hanging rack; 36. a hydraulic cylinder; 37. an electric slide rail slide seat; 38. a turntable; 39. a limit groove; 40. a T-shaped groove; 41. a transfer lever; 42. and a swinging groove.

Detailed Description

Example 1

As shown in fig. 1, an opening at the top end of a pickling tank 2 is arranged, an upper pickling tank 1 and a lower pickling tank 12 are arranged in the pickling tank 2, the lower pickling tank 12 is divided into a first weak acid area 3, a second weak acid area 5, a wire turning area 6, a medium acid area 7 and a strong acid area 8 through a partition plate, a hanging frame 35 is arranged in the pickling tank 2, a pickling workpiece 32 is hung on the hanging frame 35, and the pickling workpiece 32 sequentially passes through the first weak acid area 3, the second weak acid area 5, the wire turning area 6, the medium acid area 7 and the strong acid area 8 through the hanging frame 35 during pickling.

The pickled work piece 32 is a wire coil.

As shown in fig. 1 and 2, a moving rail 10 is installed in the pickling tank 2, the movement of the steel wire is facilitated, a hanger 35 is installed on the moving rail 10, as shown in fig. 3 and 4, a T-shaped groove 40 is formed in the moving rail 10, an electric sliding rail slide 37 is installed in the T-shaped groove 40, in operation, the electric sliding rail slide 37 moves in the T-shaped groove 40, a hydraulic cylinder 36 is connected to the electric sliding rail slide 37, and the hanger 35 is installed at the bottom of the hydraulic cylinder 36.

As shown in fig. 3, the hanger 35 is rotatably connected with the bottom of the hydraulic cylinder 36, in order to facilitate the feeding and discharging of the wire coil, a swinging groove 42 is provided at the bottom end of the telescopic rod of the hydraulic cylinder 36, the swinging shaft 34 is rotatably connected with the swinging groove 42, one end of the hanger 35 is mounted on the swinging shaft 34, one end of the swinging shaft 34 is connected with a motor, the motor drives the swinging shaft 34 to rotate, the hanger 35 swings with the rotation of the swinging shaft 34, when the hanger 35 swings upwards, that is, the angle between the hanger 35 and the telescopic rod of the hydraulic cylinder 36 is smaller than 90 degrees, the pickling work is performed on the pickling work, that is, the angle between the hanger 35 and the telescopic rod of the hydraulic cylinder 36 is larger than 90 degrees when the hanger 35 swings downwards, and the position of the pickling work 32 is transferred.

As shown in fig. 1, the upper pickling tank 1 and the lower pickling tank 12 are distributed in a staggered manner from top to bottom and from left to right, and an intermediate support plate 9 is installed in the pickling tank 2 and is used for bearing the upper pickling tank 1.

As shown in fig. 2, the hanging frame 35 and the moving rail 10 are respectively arranged above the upper pickling tank 1 and the lower pickling tank 12, and if the pickling effect is poor after the pickling in the lower pickling tank 12, the pickled workpiece is further pickled in the upper pickling tank 1 again, so that the concentration of the pickling solution is prevented from being influenced by the pickling in the lower pickling tank 12, and the pickling effect of the subsequent pickled workpiece is further influenced.

As shown in fig. 2 and 5, an auxiliary transmission plate 11 is arranged between the moving rails 10, a hydraulic cylinder 36 is mounted at the bottom end of the auxiliary transmission plate 11, a transfer rod 41 is rotatably connected to the bottom of the hydraulic cylinder 36, the mounting structure between the transfer rod 41 and the hydraulic cylinder 36 is identical to the mounting structure between the hanger 35 and the hydraulic cylinder 36, and the position of the pickling workpiece 32 is transferred by swinging the hanger 35 and the transfer rod 41.

When the extension line of the hanger 35 and the extension line of the adjacent transfer rod 41 are on the same straight line, the pickling workpiece 32 is transferred, and the included angle between the straight line and the horizontal plane is smaller than 90 degrees.

The rotary table 38 is installed at the top end of the hydraulic cylinder 36 connected to the transfer lever 41, and the transfer lever 41 is symmetrically disposed on the hydraulic cylinder 36 connected to the auxiliary transmission plate 11 so as to transfer the wire coil located right above the lower pickling tank 12 to right above the upper pickling tank 1.

As shown in fig. 5, the hanger frames 35 are uniformly provided with spacing grooves 39 at intervals, when the included angle between the hanger frames 35 and the telescopic rod of the hydraulic cylinder 36 is smaller than 90 degrees, the position of the pickling workpiece is limited, the pickling effect is prevented from being influenced by accumulation of the steel wire coil, the pickling is ensured to be uniform, the pickling time is saved, the groove depth of the spacing grooves 39 is smaller than the radius of the steel wire coil, when the included angle between the hanger frames 35 and the telescopic rod of the hydraulic cylinder 36 is larger than 90 degrees, the steel wire coil can be smoothly transferred onto the transfer rod 41 by means of gravity of the hanger frames 35, the rod body of the transfer rod 41 is a smooth surface, so that the steel wire coil can be moved from one side of the hanger frames 35 to the other hanger frame 35, and the friction force is reduced.

In order to ensure the reliability of the transferring action of the wire coil, the shortest distance between the adjacent transferring rod 41 and the hanger 35 is smaller than the diameter of the pickling workpiece 32, so that the wire coil is prevented from falling off in the transferring process, and the pickling efficiency is prevented from being influenced.

Since the pickling solution remains on the steel wire coil after the steel wire coil is pickled in the lower pickling tank 12, in order to avoid the pickling solution from dripping into the upper pickling tank 1 during transfer, the upper pickling tank 1 is sequentially provided with a strong acid zone 8, a medium acid zone 7, a second weak acid zone 5 and a first weak acid zone 3 from left to right.

Example two

On the basis of the first embodiment, as shown in fig. 3, the hydraulic cylinder 36 is provided with a hanger 35, and in order to improve the primary pickling efficiency, the bottom end of the electric slide rail slide seat 37 is provided with a turntable 38, the hydraulic cylinder 36 is mounted on the turntable 38, and the turntable 38 is an electric turntable, and the hydraulic cylinder 36 is rotated by the turntable 38, so as to realize primary transfer of a plurality of steel wire coils.

In order to further improve the pickling efficiency, as shown in fig. 6, a partition plate 16 is installed in the first weak acid area 3, a pickling solution is filled above the partition plate 16, a transfer tank 15 is arranged below the partition plate 16, one end of the transfer tank 15 is connected with a liquid suction pipe 17, the other end of the transfer tank is connected with a liquid inlet pipe 14, a liquid outlet 20 is arranged on the partition plate 16, the inlet end of the liquid suction pipe 17 is positioned in the liquid outlet 20, and the outlet end of the liquid inlet pipe 14 is positioned above the partition plate 16, so that the pickling solution can be replaced and replenished in time.

As shown in fig. 7, a locking door 18 is arranged on the partition plate 16, the locking door 18 is hinged with the partition plate 16, a handle 19 is arranged on the locking door 18, when the handle 19 is manually lifted, the locking door 18 is opened, and when the handle 19 is released, the locking door 18 is closed;

when the locking door 18 is opened, the transfer pot 15 can be replaced, so that the replacement speed of the pickling solutions in different pickling areas in the pickling tank is improved, and compared with a method for replacing the pickling solution in the pickling tank after being pumped out, the time is saved.

Other structures and principles in this embodiment are the same as those in the first embodiment.

Example III

On the basis of the second embodiment, in order to avoid that the pickling solution in the previous pickling area is brought into the next pickling area during the movement of the wire coil, the concentration of the pickling solution in the next pickling area is affected, and thus, as shown in fig. 1, a pretreatment area is further provided in the lower pickling tank 12.

As shown in fig. 8, the partition plate 16 is provided in the pretreatment area, the partition plate 16 is located at the middle position of the first weak acid area 3, and the height of the hanger 35 from the uppermost limit position to the position in the first weak acid area 3 (the wire coil is completely immersed in the pickling solution) is equal to half the height of the hanger 35 from the uppermost limit position to the position in the pretreatment area (the wire coil is completely immersed in the mixed solution 4).

The partition plate 16 is provided with the through holes 21 so as to facilitate the passing of the steel wire coil and the hanging frame 35, the partition plate 16 divides the pretreatment area into a drying area 23 and a cleaning area 26, the cleaning area 26 is positioned below the partition plate 16, the drying area 23 is positioned above the partition plate 16, the cleaning area 26 is internally filled with the mixed solution 4, the mixed solution 4 is water, and the pickling solution remained on the steel wire coil is removed through the mixed solution 4, so that the pickling solution in the last pickling area is prevented from being moved into the next pickling area along with the steel wire coil.

To further ensure the concentration of the pickling solution in the next pickling zone, a wiper assembly 29 is installed in the drying zone 23, as shown in fig. 9.

The wiper assembly 29 is installed on the center rod 30, the bottom end of the center rod 30 is connected with the supporting rod 27, the installation included angle between the center rod 30 and the supporting rod 27 is larger than 90 degrees, the other end of the supporting rod 27 is installed on the pushing plate 28, the inner wall of the pretreatment area is provided with the containing cavity 24, the pushing plate 28 is located in the containing cavity 24, one end of the containing cavity 24 is provided with an open end, the open end is provided with the cover plate 22, the cover plate 22 is provided with the hydraulic push rod 31, the other end of the hydraulic push rod 31 is connected with the pushing plate 28, the other side of the containing cavity 24 is provided with a plurality of sliding grooves 25, and when the hydraulic push rod 31 enables the sliding plate 28 to move in the containing cavity 24, the supporting rod 27 moves along the sliding grooves 25.

The distance between the symmetrically arranged wiper assemblies 29 is adjusted through the hydraulic push rod 31, residual water on the surface of the steel wire coil is sucked away through contact between the wiper assemblies 29 and the steel wire coil, and the wiper assemblies 29 are made of diatomite.

In order to further ensure the water absorbing performance of the wiper assembly 29, as shown in fig. 10, the wiper assembly 29 is further sleeved with a water absorbing assembly 33 to enlarge the water absorbing capacity of the wiper assembly 29.

The structures of the second weak acid zone 5, the medium acid zone 7 and the strong acid zone 8 are the same as those of the first weak acid zone 3, and as shown in fig. 11, the strong acid zone 8, the pretreatment zone, the medium acid zone 7, the pretreatment zone, the second weak acid zone 5, the pretreatment zone, the first weak acid zone 3 and the pretreatment zone are sequentially arranged in the upper pickling tank 1 from left to right.

Other components and principles in this embodiment are the same as in the embodiment.

The invention also provides a method for circulating the pickling device of the pickling tank, which comprises the following steps:

acid washing is carried out through the following acid washing tank 12:

the hanging frame 35 is positioned right above the first weak acid area 3, and the hydraulic cylinder 36 pushes down the hanging frame 35 to submerge the pickling workpiece 32 into the pickling solution for preliminary pickling;

the hydraulic cylinder 36 pulls up the hanger 35, the electric slide rail slide seat 37 moves on the moving rail 10, and after the hanger 35 moves to the position right above the pretreatment area, the hanger 35 moves down, so that the hanger 35 is immersed in the mixed liquid 4 and then lifted;

after the pickling workpiece 32 moves to the drying area 23, stopping, and after the water on the surface of the pickling workpiece 32 is adsorbed by the relative movement of the symmetrically arranged wiper assemblies 29, the wiper assemblies 29 move back to back again;

the hanging frame 35 continues to move upwards, the electric sliding rail sliding seat 37 continues to drive the hanging frame 35 to move above the second weak acid area 5, and the steps are repeated until the steel wire coil is subjected to acid washing in the last strong acid area, and the hanging frame 35 pulls up the steel wire coil;

if the pickling effect of the steel wire coil does not reach the standard, the pickling is continuously carried out by adopting the upper pickling tank 1:

the hydraulic cylinder 36 pulls up the hanger 35, the hanger 35 right above the lower pickling tank 12 is higher than the hanger 35 of the upper pickling tank 1, the motor drives the swinging shaft 34 to rotate, the adjacent transfer rod 41 and the hanger 35 are on the same straight line, the pickling workpiece right above the lower pickling tank 12 is transferred to the upper part of the upper pickling tank 1 through the rotation of the transfer rod 41, the pickling is continuously repeated, and the steel wire coil is placed in the upper pickling tank 1 for the second pickling.

The above is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that the present invention is described in detail with reference to the foregoing embodiments, and modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. The utility model provides a pickling tank circulation pickling device which characterized in that includes:

the top end of the pickling tank is provided with an opening, an upper pickling tank and a lower pickling tank are arranged in the pickling tank, the lower pickling tank is divided into a first weak acid area, a second weak acid area, a wire turning area, a medium acid area and a strong acid area through a partition board, and hanging pieces are respectively arranged above the upper pickling tank and the lower pickling tank and used for hanging pickling workpieces;

the device comprises a movable rail, a hanging rack, a hydraulic cylinder, an auxiliary transmission plate, a transfer rod and a pickling workpiece, wherein the movable rail is used for installing the hanging rack;

a partition plate is arranged in the first weak acid region, an acid washing solution is filled above the partition plate, a transfer tank is arranged below the partition plate, one end of the transfer tank is connected with a liquid suction pipe, the other end of the transfer tank is connected with a liquid inlet pipe, a liquid outlet is arranged on the partition plate, the inlet end of the liquid suction pipe is positioned in the liquid outlet, the outlet end of the liquid inlet pipe is positioned above the partition plate, and the partition plate is positioned in the middle of the first weak acid region; the structures of the second weak acid region, the medium acid region and the strong acid region are the same as those of the first weak acid region;

the lower pickling tank is internally provided with a pretreatment area, a partition plate is arranged in the pretreatment area, the partition plate is provided with a through hole, the pretreatment area is divided into a drying area and a cleaning area by the partition plate, the cleaning area is positioned below the partition plate, the drying area is positioned above the partition plate, the cleaning area is filled with mixed liquid, the mixed liquid is water, and a water scraping assembly is arranged in the drying area;

the water scraping assembly is arranged on the central rod, the bottom end of the central rod is connected with a supporting rod, the installation included angle between the central rod and the supporting rod is larger than 90 degrees, the other end of the supporting rod is arranged on the pushing plate, the inner wall of the pretreatment area is provided with a containing cavity, the pushing plate is positioned in the containing cavity, one end of the containing cavity is provided with an open end, the open end is provided with a cover plate, the cover plate is provided with a hydraulic push rod, the other end of the hydraulic push rod is connected with the pushing plate, the other side of the containing cavity is provided with a plurality of sliding grooves, when the sliding plate moves in the containing cavity by the hydraulic push rod, the supporting rod moves along the sliding grooves, and the water absorbing assembly is sleeved on the water scraping assembly;

the upper pickling tank is internally provided with a strong acid zone, a pretreatment zone, a medium acid zone, a pretreatment zone, a second weak acid zone, a pretreatment zone, a first weak acid zone and a pretreatment zone in sequence from left to right.

2. The pickling tank circulating pickling device according to claim 1, wherein the upper pickling tank and the lower pickling tank are distributed in a staggered manner up and down and left and right, and an intermediate support plate is arranged in the pickling tank and used for bearing the upper pickling tank.

3. The pickling tank circulating pickling device according to claim 1, wherein a T-shaped groove is formed in the moving track, an electric sliding rail sliding seat is installed in the T-shaped groove, a rotary table is installed at the bottom end of the electric sliding rail sliding seat, a hydraulic cylinder is installed on the rotary table, a swinging groove is formed in the bottom end of a telescopic rod of the hydraulic cylinder, a swinging shaft is connected in the swinging groove in a rotating mode, one end of a hanger is installed on the swinging shaft, one end of the swinging shaft is connected with a motor, the motor drives the swinging shaft to rotate, the hanger swings along with the rotation of the swinging shaft, pickling work is performed when the hanger swings upwards, and the position of the pickled work is transferred by matching with a transfer rod when the hanger swings downwards.

4. The pickling tank circulating pickling device according to claim 3, wherein the hanger frames are symmetrically arranged on hydraulic cylinders connected with the moving rail, limiting grooves are uniformly distributed on the hanger frames at intervals and used for limiting the positions of pickling workpieces, the rods of the transfer rods are smooth surfaces, turntables are also arranged at the tops of the hydraulic cylinders connected with the transfer rods, the transfer rods are symmetrically arranged on the hydraulic cylinders connected with the auxiliary transmission plate, the structures of the hydraulic cylinders connected with the transfer rods are identical to those of the hydraulic cylinders connected with the hanger frames, and the shortest distance between the adjacent transfer rods and the hanger frames is smaller than the diameter of the pickling workpieces.

5. The pickling tank circulating pickling device according to claim 1, wherein the partition plate is provided with a locking door, the locking door is hinged with the partition plate, the locking door is provided with a handle, when the handle is manually lifted, the locking door is opened, and when the handle is released, the locking door is closed.

6. A method of using the pickling tank circulation pickling apparatus according to any one of claims 1 to 5, comprising the steps of:

step one: the pickling tank is used for pickling, the hanger is positioned right above the first weak acid area, and the hydraulic cylinder pushes down the hanger, so that the pickled workpiece is immersed into the pickling solution for preliminary pickling;

step two: the hydraulic cylinder pulls up the hanger, the electric sliding rail slide seat moves on the moving rail, and after the hanger moves to the position right above the pretreatment area, the hanger moves down, so that the hanger is immersed in the mixed liquid and then lifted up;

step three: the pickling workpiece is stopped after moving to a drying area, and the symmetrically arranged wiper assemblies move oppositely after extruding the surface of the pickling workpiece;

step four: the hanging rack continues to move upwards, the electric sliding rail sliding seat continues to drive the hanging rack to move above the second weak acid area, and the steps are repeated;

step five: and the hydraulic cylinder pulls up the hanging rack, the hanging rack right above the lower pickling tank is higher than the hanging rack of the upper pickling tank, the pickling workpiece right above the lower pickling tank is transferred to the upper part of the upper pickling tank by matching with the transfer rod, and the pickling is continuously repeated for the second pickling.