CN113697925A

CN113697925A - Neutralizing treatment device for vehicle pickling waste liquid

Info

Publication number: CN113697925A
Application number: CN202111035059.0A
Authority: CN
Inventors: 题兆峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-05
Filing date: 2021-09-05
Publication date: 2021-11-26

Abstract

The invention provides a neutralizing treatment device for acid pickling waste liquid of vehicles, which comprises a liquid inlet pipe and a gas outlet pipe symmetrically arranged at two ends of the upper part of a neutralizing tank, wherein a first liquid inlet check valve is arranged in the liquid inlet pipe, a gas outlet check valve is arranged in the gas outlet pipe, a piston rod is arranged below a hydraulic cylinder, a connecting seat with a rod is arranged at the lower end of the piston rod, a liquid outlet pipe is arranged at the symmetrical side of a suction pipe on the neutralizing tank, a liquid outlet check valve is arranged in the liquid outlet pipe, a primary piston is connected at the lower end of the connecting seat with the rod, a thrust ring is in threaded connection in the neutralizing tank, a secondary piston is in sliding connection in the neutralizing tank, a slot is arranged on the lower end surface of the secondary piston, the primary piston is in sliding connection in the slot, a hole communicated with the slot is arranged on the secondary piston, a plurality of connecting springs are arranged between the connecting seat with the secondary piston, a second liquid inlet check valve is arranged in the first suction pipe, can carry out neutralization treatment on the pickling waste liquid and ensure higher single neutralization rate.

Description

Neutralizing treatment device for vehicle pickling waste liquid

Technical Field

The invention relates to a neutralization treatment device, in particular to a neutralization treatment device for a vehicle pickling waste liquid.

Background

In the production of vehicles, the acid washing treatment of vehicle parts is needed to improve the durability of the parts, while the waste liquid after acid washing is neutralized and is not allowed to be discharged when the discharge standard is not met, the neutralization efficiency of the traditional neutralization treatment device is low when the acid washing treatment is carried out, and the neutralization treatment is needed to be carried out for a plurality of times, so the neutralization treatment device for the acid washing waste liquid of the vehicles is invented.

Disclosure of Invention

The invention aims to provide a neutralization treatment device for a vehicle pickling waste liquid, which can be used for neutralizing the pickling waste liquid and ensures a high single-time neutralization rate.

In order to solve the technical problems, the invention provides a neutralizing treatment device for pickling waste liquor of a vehicle, which comprises an acid liquor box inlet pipe, an acid liquor box communicated with the acid liquor box inlet pipe, a negative pressure pipe inserted into the acid liquor box inlet pipe, and a neutralizing box communicated with a first suction pipe, wherein a liquid inlet pipe and a gas outlet pipe are symmetrically arranged at two ends of the upper part of the neutralizing box, a first liquid inlet one-way valve is arranged in the liquid inlet pipe, a gas outlet one-way valve is arranged in the gas outlet pipe, a hydraulic cylinder is fixedly connected to the neutralizing box, a piston rod is arranged below the hydraulic cylinder, the piston rod is in sliding connection with the neutralizing box, a connecting seat with a rod is arranged at the lower end of the piston rod, a liquid outlet pipe is arranged at the symmetrical side of the suction pipe on the neutralizing box, a liquid outlet one-way valve is arranged in the liquid outlet pipe, a primary piston is connected to the lower end of the connecting seat with the rod, a thrust ring is in threaded connection with the neutralizing box, a secondary piston is in sliding connection with the neutralizing box, a slot is arranged on the lower end surface of the secondary piston, one-level piston sliding connection is equipped with the trompil that is linked together with the fluting on the second grade piston in the fluting, is equipped with several connecting spring between second grade piston and the belted rod connecting seat, and belted rod connecting seat and second grade piston sliding connection, second feed liquor check valve set up in first suction pipe.

Further, the vehicle pickle liquor neutralization treatment device also comprises: the buffering filter box is connected to the middle position of the negative pressure pipe, and corrosion-resistant soft nozzles are symmetrically arranged on two sides of the buffering filter box; the filter cloth penetrates through the corrosion-resistant soft nozzle on one side and then penetrates out of the other side to form a closed loop; the friction wheel is in friction connection with the filter cloth; the supporting seat is connected with the friction wheel in a rotating mode, the motor is further connected to the supporting seat, the rotating end of the motor is connected to the friction wheel on one side, impurities in waste liquid can be filtered out in advance, and the cleaning can be convenient.

Further, the vehicle pickle liquor neutralization treatment device also comprises: the first connecting pipe is communicated with the liquid outlet pipe; the secondary neutralizing tank is communicated below the first connecting pipe; the stirring motor is arranged on one side of the secondary neutralization tank; the shaft coupling is connected to the rotating end of the stirring motor; the belt shaft stirring wheel is rotationally connected to the secondary neutralizing tank and is connected with the coupler; the cam is connected to one end, far away from the coupler, of the belt shaft stirring wheel; the matching seat is contacted with the cam and is also connected with a piston with a rod; the spring is sleeved on the piston with the rod; the compression box is connected to the secondary neutralization box, the piston with the rod is connected in the compression box in a sliding manner, and two ends of the spring are respectively connected to the matching seat and the compression box; one end of the second suction pipe is communicated with the compression box, and the other end of the second suction pipe is connected to the upper end surface of the secondary neutralization box and communicated with the interior of the secondary neutralization box; a discharge pipe communicating with the compression box; a buffer tank communicated with the discharge pipe; the second connecting pipe is communicated with the buffer tank; the air box is communicated with the second connecting pipe, and the stirring wheel with the shaft is rotationally connected with the air box; the wind wheel is connected with the stirring wheel with the shaft and is arranged in the air box; the connecting port is arranged on the air box; a one-way valve is arranged in the second suction pipe and is opened towards the inside of the compression box in a one-way direction; be equipped with the check valve in the delivery pipe, the direction is opened in the one-way buffer tank, can carry out the secondary neutralization, prevents to discharge not up to standard, and can realize discharging harmfully.

Further, the vehicle pickle liquor neutralization treatment device also comprises: the liquid outlet is arranged below the buffer tank, and the buffer tank is also provided with an inclined plate corresponding to the discharge pipe; the movable pipe is arranged in the secondary neutralization box, a lower pipe opening is arranged below the movable pipe, and the lower pipe opening is attached to the inner wall bottom plate of the secondary neutralization box; the movable seat is connected with the movable pipe and is in sliding connection with the neutralization box; the switching hydraulic rod is connected to the upper end face of the movable seat; the switching hydraulic cylinder is connected with the switching hydraulic rod and connected with the neutralizing tank, and whether the waste liquid reaches the neutralizing standard or not can be detected.

Further, the elastic force of the connecting spring is larger than the pressure applied to the inside of the centering case when the primary piston and the secondary piston move downward at the same time.

Furthermore, a pipeline for introducing the alkaline solution is arranged on the upper end face of the secondary neutralization tank, a pipeline for discharging the neutralization solution is arranged on the side face of the secondary neutralization tank, and the pipeline is provided with a gate for controlling opening and closing.

Furthermore, corrosion-resistant materials are adopted at the parts of the device, which are contacted with the acid-base solution.

Further, the movable tube moves upwards to be inserted into the second suction tube and tightly attached to the second suction tube.

To sum up, adopt above-mentioned device, can carry out neutralization treatment to the pickling waste liquid, and guarantee higher single neutralization rate, can filter out in advance the impurity in the waste liquid, and clearance that can be convenient can carry out secondary neutralization, prevent to discharge not up to standard, and can realize discharging harmfully, can detect whether the waste liquid reaches the neutralization standard.

Drawings

FIG. 1 is a schematic diagram of a first overall structure of a neutralization treatment device for a waste pickle liquor of a vehicle.

FIG. 2 is a schematic diagram of a part A of the neutralizing treatment device for the acid pickling waste liquid of the vehicle in FIG. 1.

FIG. 3 is a schematic diagram of a first cross-sectional structure of a neutralization treatment device for a waste pickle liquor of a vehicle according to the present invention.

FIG. 4 is a schematic diagram of a second cross-sectional structure of a neutralization treatment device for waste pickle liquor of a vehicle.

FIG. 5 is a schematic diagram of a part B of the neutralizing treatment device for the acid pickling waste liquid of the vehicle in FIG. 4.

FIG. 6 is a schematic diagram of a second overall structure of a neutralization treatment device for a waste pickle liquor of a vehicle according to the present invention.

FIG. 7 is a third schematic sectional view of a neutralization treatment apparatus for waste pickle liquor of a vehicle according to the present invention.

FIG. 8 is a schematic diagram of a part C of the apparatus for neutralizing and treating a spent pickling solution for a vehicle according to the present invention, partially enlarged.

FIG. 9 is a fourth schematic sectional view of a neutralization treatment apparatus for waste pickle liquor of a vehicle according to the present invention.

FIG. 10 is a schematic diagram showing a fifth cross-sectional structure of a neutralization treatment apparatus for a waste pickle liquor of a vehicle according to the present invention.

FIG. 11 is a sixth schematic sectional view of a neutralization treatment apparatus for a waste pickle liquor of a vehicle according to the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

As shown in the accompanying drawings, an embodiment of the present invention provides a vehicle acid pickling waste liquid neutralization treatment apparatus, including an acid tank inlet pipe 1, an acid tank 2 communicated with the acid tank inlet pipe 1, a negative pressure pipe 3 inserted into the acid tank inlet pipe 1, and a neutralization tank 5 communicated with a first suction pipe 4, wherein: a liquid inlet pipe 7 and a gas outlet pipe 9 are symmetrically arranged at two ends of the upper part of the neutralization box 5, a first liquid inlet one-way valve 6 is arranged in the liquid inlet pipe 7, a gas outlet one-way valve 11 is arranged in the gas outlet pipe 9, a hydraulic cylinder 8 is fixedly connected on the neutralization box 5, a piston rod 20 is arranged below the hydraulic cylinder 8, the piston rod 20 is in sliding connection with the neutralization box 5, a connecting seat 19 with a rod is arranged at the lower end of the piston rod 20, a liquid outlet pipe 10 is arranged at the symmetrical side of a suction pipe 4 on the neutralization box 5, a liquid outlet one-way valve 12 is arranged in the liquid outlet pipe 10, a primary piston 13 is connected at the lower end of the connecting seat 19 with the rod, a thrust ring 14 is in the neutralization box 5 in a threaded connection manner, a secondary piston 15 is in the neutralization box 5 in a sliding connection manner, a slot 16 is arranged on the lower end surface of the secondary piston 15, the primary piston 13 is in the slot 16 in a sliding connection manner, an open hole 17 communicated with the slot 16 is arranged on the secondary piston 15, and a plurality of connecting springs 18 are arranged between the secondary piston 15 and the connecting seat 19 with the rod, the connecting seat 19 with the rod is connected with the secondary piston 15 in a sliding manner, the second liquid inlet one-way valve 21 is arranged in the first suction pipe 4, the liquid inlet pipe 7 is externally connected with an alkali solution pipeline, an acid solution to be neutralized is led into the acid solution tank 2 through the acid solution tank inlet pipe 1, the piston rod 20 is driven to move downwards through the hydraulic cylinder 8, the piston rod 20 can drive the connecting seat 19 with the rod to move downwards, the elastic force of the connecting spring 18 is greater than the pressure applied to the interior of the neutralization tank 5 when the primary piston 13 and the secondary piston 15 move downwards simultaneously, the connecting seat 19 with the rod can drive the secondary piston 15 and the primary piston 13 to synchronously move downwards through the connecting spring 18, the areas below the secondary piston 15 and the primary piston 13 in the neutralization tank 5 can be pressurized in the process of moving downwards so that the gas in the area below is discharged from the liquid outlet one-way valve 12, and in the process, the area above the secondary piston 15 and the primary piston 13 is in the process of increasing the volume and reducing the pressure, the alkaline solution in the external pipeline of the liquid inlet pipe 7 can break the first liquid inlet one-way valve 6 and enter the area above the secondary piston 15, when the secondary piston 15 moves to the position of the thrust ring 14, the second piston 15 can be supported, the rod connecting seat 19 can overcome the elasticity of the connecting spring 18 to drive the primary piston 13 to move downwards when continuing to move downwards, the liquid outlet one-way valve 12 cannot be closed under pressure, the primary piston 13 moves downwards and can be separated from the slot 16, the alkaline solution above the secondary piston 15 can move downwards from the opening 17 and flows into the cavity below the secondary piston 15 through the primary piston 13, then the hydraulic cylinder 8 drives the rod connecting seat 19 to reset downwards, under the elasticity of the connecting spring 18, the primary piston 13 is firstly reset into the slot 16 to complete the sealing of the opening 17, and then the secondary piston 15 and the primary piston 13 move upwards together, at the moment, the pressure below the secondary piston 15 and the primary piston 13 is reduced and is in a negative pressure state, at the moment, the acidic waste liquid in the acid liquid tank 2 enters the area of the neutralization tank 5 below the secondary piston 15 and the primary piston 13 from the first liquid inlet one-way valve 6 after passing through the negative pressure pipe 3 and the first suction pipe 4, the pressure in the area of the neutralization tank 5 above the secondary piston 15 and the primary piston 13 is increased to flush the air outlet one-way valve 11 for exhausting, the acidic waste liquid can be flushed with the existing alkali solution when entering, the two can be rapidly fused and reacted under the action of the flushing, so that the neutralization effect is achieved, when the processes are repeated again, the solution sprayed from the liquid outlet one-way valve 12 is the solution after the neutralization reaction, the acid solution in the acid liquid tank 2 can be continuously neutralized by repeating the above steps, and the amount of the compression space changed by the secondary piston 15 and the primary piston 13 can be adjusted by adjusting the position of the thrust ring 14, thereby varying the amount of acid and alkali solution to be inhaled, and can be selected according to the flow rate.

In this embodiment, the apparatus for neutralizing and treating a spent pickling liquid for a vehicle further includes: the buffering filter box 22 is connected to the middle position of the negative pressure pipe 3, and corrosion-resistant soft nozzles 25 are symmetrically arranged on two sides of the buffering filter box 22; the filter cloth 24 penetrates through the corrosion-resistant soft nozzle 25 at one side and then penetrates out from the other side to form a closed loop; a friction wheel 23 which is in friction connection with the filter cloth 24; the supporting seat 27 is rotatably connected with the friction wheel 23, the supporting seat 27 is also connected with the motor 26, the rotating end of the motor 26 is connected with the friction wheel 23 on one side, the arrangement of the corrosion-resistant soft nozzle 25 can ensure sealing without influencing the liquid transmission effect of the negative pressure pipe 3, and the arrangement of the filter cloth 24 can filter the sucked acidic waste liquid, after a period of time, the motor 26 can be operated to drive the friction wheel 23 connected with the motor to rotate, the friction wheel 23 can drive the filter cloth 24 to move, thereby leading the filter cloth 24 of the new area to enter the buffering filter box 22 to take the filtering function, while impurities on the filter cloth 24 moving out of the buffer filter box 22 are scraped on the corrosion-resistant soft mouth 25, and the sealing function of the corrosion-resistant soft nozzle 25 cannot be influenced in the movement process of the filter cloth 24, the corrosion-resistant soft nozzle 25 only needs to be cleaned regularly, and the new corrosion-resistant soft nozzle 25 and the filter cloth 24 are replaced if necessary.

In this embodiment, the apparatus for neutralizing and treating a spent pickling liquid for a vehicle further includes: a first connecting pipe 28 communicated with the liquid outlet pipe 10; a secondary neutralization tank 29 communicating below the first connection pipe 28; a stirring motor 30 provided on one side of the secondary neutralization tank 29; a coupling 31 connected to a rotation end of the stirring motor 30; the belt shaft stirring wheel 32 is rotationally connected to the secondary neutralizing tank 29, and the belt shaft stirring wheel 32 is connected with the coupler 31; a cam 33 connected to one end of the stirring wheel 32 with a shaft far away from the coupler 31; a matching seat 34 contacted with the cam 33, and a piston 36 with a rod is connected on the matching seat 34; a spring 35 sleeved on the piston 36 with the rod; a compression box 37 connected to the secondary neutralization box 29, a piston 36 with a rod is connected in the compression box 37 in a sliding way, and two ends of a spring 35 are respectively connected to the matching seat 34 and the compression box 37; a second suction pipe 38 having one end communicating with the compression box 37 and the other end connected to the upper end surface of the secondary neutralization box 29 and communicating with the inside of the secondary neutralization box 29; a discharge pipe 39 communicating with the compression tank 37; a buffer tank 40 communicating with the discharge pipe 39; a second connection pipe 41 communicating with the buffer tank 40; an air box 42 communicated with the second connecting pipe 41, and the stirring wheel with shaft 32 is rotationally connected with the air box 42; the wind wheel 43 is connected with the stirring wheel 32 with the shaft and is arranged in the wind box 42; a connection port 44 provided on the air box 42; a one-way valve is arranged in the second suction pipe 38 and is opened towards the compression box 37 in a one-way direction; a one-way valve is arranged in the discharge pipe 39 and is opened towards the buffer tank 40 in a one-way direction, a pipeline for introducing alkali solution is arranged on the upper end face of the secondary neutralizing tank 29, a pipeline for discharging neutralizing solution is arranged on the side face of the secondary neutralizing tank, a gate for controlling opening and closing is arranged on the pipeline, the stirring motor 30 is operated to drive the coupler 31 to rotate, the coupler 31 can drive the stirring wheel 32 with a shaft to rotate, the neutralized liquid sprayed out of the liquid outlet pipe 10 can enter the secondary neutralizing tank 29 along the first connecting pipe 28, the secondary neutralizing tank 29 can be used for neutralizing and stirring again in order to prevent the solution from completely reaching the standard, if the standard is not reached, the pipeline for introducing alkali solution is arranged on the upper end face of the secondary neutralizing tank 29, the alkali solution is introduced by the stirring action of the stirring wheel 32 with the shaft, the neutralization is quickly neutralized, and after the solution reaches the standard, the gate of the pipeline for discharging neutralizing solution from the secondary neutralizing tank 29 is opened for discharging, the secondary neutralization tank 29 is internally precipitated, the belt shaft stirring wheel 32 drives the cam 33 to rotate in the rotating process, the cam 33 drives the matching seat 34 to do reciprocating linear motion through matching with the spring 35, the matching seat 34 drives the belt rod piston 36 to do reciprocating motion, the belt rod piston 36 brings pressure difference change in the compression tank 37, therefore, harmful gas in the secondary neutralization tank 29 is sucked into the compression tank 37 from the one-way valve in the second suction pipe 38, then is pressurized, and then rushes out the one-way valve in the discharge pipe 39 to be discharged into the buffer tank 40, the wind wheel 43 is driven to rotate when the stirring wheel 32 with the shaft rotates, the wind wheel 43 can cause flow, the flow direction is from the buffer tank 40 to the connection port 44, the discharged gas is just drained, the gas is discharged from the connection port 44, the connection port 44 can be externally connected with a pipeline for transporting the gas, and the gas is transported into equipment for processing the gas.

In this embodiment, the apparatus for neutralizing and treating a spent pickling liquid for a vehicle further includes: a liquid outlet 45 arranged below the buffer tank 40, wherein the buffer tank 40 is also provided with an inclined plate 46 corresponding to the discharge pipe 39; the movable pipe 48 is arranged inside the secondary neutralization tank 29, a lower pipe opening 47 is arranged below the movable pipe 48, and the lower pipe opening 47 is attached to the bottom plate of the inner wall of the secondary neutralization tank 29; a movable seat 49 connected with the movable pipe 48, wherein the movable seat 49 is connected with the neutralization tank 29 in a sliding way; a switching hydraulic rod 50 connected to the upper end surface of the movable seat 49; the switching hydraulic cylinder 51 is connected with the switching hydraulic rod 50, the switching hydraulic cylinder 51 is connected with the neutralizing tank 29, when the pH value of the liquid in the neutralizing tank 29 needs to be detected, the switching hydraulic rod 50 can drive the switching hydraulic rod 50 to pull the movable seat 49 upwards, the movable seat 49 can drive the movable pipe 48 to move upwards, the movable pipe 48 can move upwards and can be inserted into the second suction pipe 38 and tightly attached to the second suction pipe, when the pressure in the compression tank 37 changes, the movable pipe 48 and the second suction pipe 38 are connected into a whole, so that the liquid in the neutralizing tank 29 can be sucked into the second suction pipe 38 at the moment, then the liquid is ejected from the one-way valve of the exhaust pipe 39, is ejected onto the inclined plate 46 and then is ejected from the liquid outlet 45, so that the liquid can be collected at the liquid outlet 45, the pH value test can be conveniently carried out, and the gas flow caused by the wind wheel 43 can still absorb the liquid doped when the liquid is ejected, and inhale external air from liquid outlet 45, play air-purifying's effect, and the activity pipe 48 upward movement's the twinkling of an eye, originally laminate in the secondary with the lower mouth of a pipe 47 of the inner wall bottom plate of case 29 break away from the twinkling of an eye can make liquid surge in activity pipe 48, be convenient for inhale liquid.

In this embodiment, the parts of the device that are in contact with the acid-base solution are made of corrosion-resistant materials.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: can carry out neutralization treatment to the pickling waste liquid, and guarantee higher single neutralization rate, can filter out the impurity in the waste liquid in advance, and clearance that can be convenient can carry out the secondary neutralization, prevents to discharge not up to standard, and can realize discharging harmfully, can detect whether the waste liquid reaches the neutralization standard.

It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and that various changes, modifications, additions and substitutions which are within the spirit and scope of the present invention and which may be made by those skilled in the art are also within the scope of the present invention.

Claims

1. The utility model provides a vehicle pickling waste liquid neutralization treatment device, includes acidizing fluid case admission pipe (1), acidizing fluid case (2) that are linked together with acidizing fluid case admission pipe (1), negative pressure pipe (3) of inserting acidizing fluid case admission pipe (1), neutralization case (5) that are linked together with first suction pipe (4), its characterized in that: a liquid inlet pipe (7) and an air outlet pipe (9) are symmetrically arranged at two ends of the upper part of the neutralizing box (5), a first liquid inlet one-way valve (6) is arranged in the liquid inlet pipe (7), an air outlet one-way valve (11) is arranged in the air outlet pipe (9), a hydraulic cylinder (8) is fixedly connected to the neutralizing box (5), a piston rod (20) is arranged below the hydraulic cylinder (8), the piston rod (20) is in sliding connection with the neutralizing box (5), a connecting seat (19) with a rod is arranged at the lower end of the piston rod (20), a liquid outlet pipe (10) is arranged at the symmetrical side of a suction pipe (4) on the neutralizing box (5), a liquid outlet one-way valve (12) is arranged in the liquid outlet pipe (10), a primary piston (13) is connected to the lower end of the connecting seat (19) with the rod, a thrust ring (14) is in the neutralizing box (5) in threaded connection, a secondary piston (15) is in sliding connection with the neutralizing box (5), a slot (16) is arranged on the lower end surface of the secondary piston (15), the first-stage piston (13) is connected in the groove (16) in a sliding mode, the second-stage piston (15) is provided with a hole (17) communicated with the groove (16), a plurality of connecting springs (18) are arranged between the second-stage piston (15) and the connecting seat (19) with the rod, the connecting seat (19) with the rod is connected with the second-stage piston (15) in a sliding mode, and the second liquid inlet one-way valve (21) is arranged in the first suction pipe (4).

2. The apparatus for neutralizing treatment of waste pickling liquid of vehicle as claimed in claim 1, further comprising: the buffering filter box (22) is connected to the middle position of the negative pressure pipe (3), and corrosion-resistant soft nozzles (25) are symmetrically arranged on two sides of the buffering filter box (22); the filter cloth (24) penetrates through the corrosion-resistant soft nozzle (25) at one side and then penetrates out from the other side to form a closed loop; the friction wheel (23) is in friction connection with the filter cloth (24); the supporting seat (27) is rotatably connected with the friction wheel (23), the supporting seat (27) is further connected with a motor (26), and the rotating end of the motor (26) is connected to the friction wheel (23) on one side.

3. The apparatus for neutralizing treatment of waste pickling liquid of vehicle as claimed in claim 2, further comprising: the first connecting pipe (28) is communicated with the liquid outlet pipe (10); a secondary neutralization tank (29) communicated below the first connection pipe (28); a stirring motor (30) arranged on one side of the secondary neutralization tank (29); the coupling (31) is connected to the rotating end of the stirring motor (30); the belt shaft stirring wheel (32) is rotationally connected to the secondary neutralizing tank (29), and the belt shaft stirring wheel (32) is connected with the coupler (31); the cam (33) is connected to one end of the stirring wheel (32) with the shaft, which is far away from the coupler (31); the matching seat (34) is contacted with the cam (33), and the matching seat (34) is also connected with a piston (36) with a rod; a spring (35) sleeved on the piston (36) with the rod; the compression box (37) is connected to the secondary neutralization box (29), the piston (36) with the rod is connected in the compression box (37) in a sliding manner, and two ends of the spring (35) are respectively connected to the matching seat (34) and the compression box (37); a second suction pipe (38) having one end communicating with the compression tank (37) and the other end connected to the upper end surface of the secondary neutralization tank (29) and communicating with the inside of the secondary neutralization tank (29); a discharge pipe (39) communicating with the compression box (37); a buffer tank (40) communicating with the discharge pipe (39); a second connection pipe (41) communicating with the buffer tank (40); the air box (42) is communicated with the second connecting pipe (41), and the stirring wheel (32) with the shaft is rotationally connected with the air box (42); the wind wheel (43) is connected with the stirring wheel (32) with the shaft and is arranged in the wind box (42); a connection port (44) provided on the air box (42); a one-way valve is arranged in the second suction pipe (38), and the direction is one-way and is opened towards the interior of the compression box (37); a one-way valve is arranged in the discharge pipe (39), and the direction is one-way and is opened towards the buffer tank (40).

4. The apparatus for neutralizing treatment of spent pickling solution for vehicles according to claim 3, further comprising: a liquid outlet (45) arranged below the buffer tank (40), and an inclined plate (46) corresponding to the discharge pipe (39) is also arranged on the buffer tank (40); the movable pipe (48) is arranged inside the secondary neutralization box (29), a lower pipe orifice (47) is arranged below the movable pipe (48), and the lower pipe orifice (47) is attached to the inner wall bottom plate of the secondary neutralization box (29); the movable seat (49) is connected with the movable pipe (48), and the movable seat (49) is connected with the neutralizing box (29) in a sliding manner; a switching hydraulic rod (50) connected to the upper end surface of the movable seat (49); and the switching hydraulic cylinder (51) is connected with the switching hydraulic rod (50), and the switching hydraulic cylinder (51) is connected with the neutralization tank (29).

5. The apparatus for neutralizing and treating a spent pickling solution for vehicles according to any one of claims 1 to 4, wherein: the elastic force of the connecting spring (18) is larger than the pressure applied to the interior of the centering box (5) when the primary piston (13) and the secondary piston (15) move downwards simultaneously.

6. The apparatus for neutralizing and treating a spent pickling solution for vehicles according to claim 3 or 4, wherein: the upper end face of the secondary neutralizing tank (29) is provided with a pipeline for introducing alkali solution, the side face of the secondary neutralizing tank is provided with a pipeline for discharging neutralizing solution, and the pipeline is provided with a gate for controlling opening and closing.

7. The apparatus for neutralizing and treating a spent pickling solution for vehicles according to any one of claims 1 to 4, wherein: the parts of the device contacted with the acid-base solution are made of corrosion-resistant materials.

8. The apparatus for neutralizing and treating the acid pickling waste liquid of a vehicle according to claim 4, wherein: the movable tube (48) moves upwards to be inserted into the second suction tube (38) and is tightly attached.