Passivation device for strip steel

Abstract

A passivation device for strip steel relates to the technical field of strip steel passivation devices, and comprises a passivation pool for containing passivation liquid, a material taking roller for sticking the passivation liquid from the passivation pool and a coating roller for coating the passivation liquid on the surface of the strip steel are arranged above the passivation pool, the strip steel vertically penetrates through a coating channel formed between the two coating rollers from bottom to top, so that the two coating rollers coat the surfaces of the two sides of the strip steel with the passivation solution at the same time, an overflow groove is formed in the edge, close to the strip steel, of the passivation pool, and the passivation solution in the passivation pool flows into the overflow pool located on the side through the overflow groove; a liquid inlet pipe used for conveying passivation liquid into the passivation pool is arranged on the side, away from the strip steel, of the passivation pool, a filter screen is arranged in the overflow pool, a conveying pump is arranged outside the overflow pool, an inlet of the conveying pump is communicated with a liquid outlet in the bottom of the overflow pool, an outlet of the conveying pump is communicated with the liquid inlet pipe, and caking or uneven concentration of the passivation liquid in the passivation pool is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the strip steel passivation technical field, specifically a kind of for the passivation device of strip steel. BACKGROUND

[0002] Galvanized strip steel is widely used in the field of construction, transportation and industrial equipment due to its good corrosion resistance. After strip steel is galvanized, it is prone to rust, so passivation treatment is needed after strip steel is galvanized to prevent strip steel from rusting.

[0003] Currently, a roll coating passivation device is often used to passivate strip steel. Two material taking rollers are used to stick passivation liquid in a passivation tank. Each of the two material taking rollers is in opposite roll with one coating roller to stick the passivation liquid to the coating roller. The two coating rollers simultaneously extrude the opposite roll on both sides of the strip steel to coat the passivation liquid on the strip steel from top to bottom. In the passivation process, in order to ensure that the material taking roller can normally stick the passivation liquid, passivation liquid needs to be periodically introduced into the passivation tank. In the actual production process, the material taking roller sticks the passivation liquid at a fixed position of the passivation tank. The passivation liquid at the edge position is agglomerated or has uneven concentration due to less flow or local stagnation, which finally leads to uneven passivation liquid on the surface of the strip steel. SUMMARY

[0004] In order to solve the problem that the passivation liquid is agglomerated or has uneven concentration due to local stagnation in the prior art, the utility model provides a passivation device for strip steel to avoid agglomeration or uneven concentration of passivation liquid in the passivation tank.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the specific scheme that a passivation device for strip steel comprises a passivation tank for containing passivation liquid. A material taking roller for sticking the passivation liquid from the passivation tank and a coating roller for coating the passivation liquid to the surface of the strip steel in opposite roll with the material taking roller are arranged above the passivation tank. The coating roller and the material taking roller are two groups and symmetrically arranged on both sides of the strip steel. The strip steel vertically passes through a coating channel formed between the two coating rollers from bottom to top, so that the two groups of coating rollers simultaneously coat the passivation liquid to the surface of both sides of the strip steel. An overflow groove is arranged near the edge of the strip steel on the passivation tank. The passivation liquid in the passivation tank flows into an overflow tank on the side through the overflow groove. An inlet pipe for conveying the passivation liquid into the passivation tank is arranged on the side of the passivation tank away from the strip steel. A filter screen is arranged in the overflow tank. A conveying pump is arranged outside the overflow tank. The inlet of the conveying pump is in communication with the liquid outlet at the bottom of the overflow tank. The outlet of the conveying pump is in communication with the inlet pipe.

[0006] As an optimization scheme of the above-mentioned passivation device for strip steel, a guide plate is arranged at the overflow groove. The top end of the guide plate is fixedly connected with the outer side wall of the passivation tank. The bottom end of the guide plate extends into the overflow tank.

[0007] As another optimization scheme of the above-mentioned passivation device for strip steel, the acute angle formed by the extension direction of the guide plate and the vertical direction is 30-50°.

[0008] As another optimization scheme of the above-mentioned passivation device for strip steel, the liquid inlet pipe is a tubular structure with one end closed and one end open, the opening of the liquid inlet pipe is communicated with the outlet of the conveying pump, and a plurality of liquid outlet holes are arranged on the side wall of the liquid inlet pipe and distributed along the axial direction of the liquid inlet pipe.

[0009] As another optimization scheme of the above-mentioned passivation device for strip steel, the liquid outlet hole is located below the liquid level of the passivation tank and faces the bottom of the passivation tank.

[0010] As another optimization scheme of the above-mentioned passivation device for strip steel, a filter frame is arranged in the overflow tank and located above the filter screen, and the passivation liquid overflowed from the passivation tank enters the overflow tank through the filter frame.

[0011] As another optimization scheme of the above-mentioned passivation device for strip steel, the filter frame comprises four vertical plates, the four vertical plates are connected at the ends to form a rectangular frame body with two open ends, and a filter bottom screen is arranged at the bottom end of the rectangular frame body.

[0012] As another optimization scheme of the above-mentioned passivation device for strip steel, a sliding groove extending along the height direction of the inner side wall of the overflow tank is arranged on the inner side wall of the overflow tank, and a sliding block capable of sliding along the sliding groove is arranged on the filter frame.

[0013] As another optimization scheme of the above-mentioned passivation device for strip steel, a plurality of hooks capable of being hung on the side wall of the overflow tank are fixedly arranged on the filter screen.

[0014] As another optimization scheme of the above-mentioned passivation device for strip steel, the inlet of the conveying pump is communicated with the liquid outlet through a first conveying pipe, and the outlet of the conveying pump is communicated with the liquid inlet pipe through a second conveying pipe.

[0015] Compared with the prior art, the passivation device for strip steel has the following beneficial effects:

[0016] 1. The passivation device for strip steel is provided, the passivation liquid in the passivation tank flows into the overflow tank through the overflow groove, is filtered through the overflow tank, and is conveyed to the passivation tank again through the conveying pump, that is, the passivation liquid in the passivation tank is in a flowing state, so that the passivation liquid in the passivation tank is prevented from caking or having uneven concentration; meanwhile, the overflow tank is located on the side of the passivation tank close to the strip steel, the liquid inlet pipe is located on the side of the passivation tank away from the strip steel, the small impurities are adhered and taken after the taking roller and the coating roller are in roll-to-roll, the small impurities enter the passivation tank along with the taking roller, the passivation liquid drives the small impurities to flow towards the overflow groove, that is, the overflow tank is located on the side of the taking roller entering the passivation tank, so that the impurities can be taken away in time, and the cleanliness of the passivation liquid is ensured.

[0017] 2、The utility model discloses a guide plate is provided at the overflow groove, guarantees that passivation liquid is smoothly into the overflow pool, avoids the passivation liquid overflow caused by the passivation liquid along the passivation pool lateral wall flowing out.

[0018] 3、The utility model discloses a liquid inlet hole is located below the passivation pool liquid level, and towards the passivation pool bottom, reduces the passivation pool liquid level fluctuation, and ensures the passivation liquid uniformity of strip steel surface.

[0019] 4、The utility model discloses a filter frame is provided in the overflow pool, and passivation liquid flow enters the overflow pool after the filter frame, when needing to clean the filter frame, can directly take out the filter frame and clean, at this time, the filter screen in the overflow pool still can play the filter effect, when needing to clean the filter screen, promotes the filter frame, removes the filter screen from the overflow pool, in the filter screen removal process, the filter frame still can play the filter effect, namely the setting of filter frame and filter screen can clean the filter frame and filter screen alternately under the condition of not stopping work. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the structural schematic diagram of the utility model;

[0021] Figure 2 It is the structural schematic diagram of passivation pool;

[0022] Figure 3 It is the structural schematic diagram of overflow pool;

[0023] Figure 4 It is the plan view of overflow pool;

[0024] Figure 5 It is the structural schematic diagram of liquid inlet pipe;

[0025] Reference signs: 1, passivation pool, 101, first bottom plate, 102, side plate, 103, overflow groove, 2, overflow pool, 201, liquid outlet, 202, recess, 3, delivery pump, 301, first delivery pipe, 302, second delivery pipe, 4, liquid inlet pipe, 401, liquid outlet hole, 5, material taking roller, 6, coating roller, 7, guide plate, 701, arc plate, 702, baffle, 8, filter frame, 801, filter bottom net, 802, vertical plate, 803, sliding block, 9, filter screen, 901, hook. DETAILED DESCRIPTION

[0026] The technical solution of this utility model will be further described in detail below with reference to specific embodiments. Parts not described or disclosed in detail in the following embodiments of this utility model should be understood as prior art known or should be known by those skilled in the art, such as how to periodically add passivation liquid to the overflow tank 103, the depth and rotation speed of the feeding roller 5 into the passivation tank 1, the moving speed of the strip steel, the composition of the passivation liquid, the fixing and transmission of the feeding roller 5 and the coating roller 6, etc.

[0027] Example 1

[0028] A passivation device for steel strip, such as Figure 1 As shown, the system includes a passivation tank 1 for holding the passivation solution. Above the passivation tank 1 are a take-up roller 5 for picking up the passivation solution from the tank 1 and a coating roller 6 that rolls against the take-up roller 5 to coat the passivation solution onto the surface of the strip. The coating roller 6 and the take-up roller 5 are in two sets and symmetrically arranged on both sides of the strip. The strip passes vertically from bottom to top through the coating channel formed between the two coating rollers 6, so that the two sets of coating rollers 6 simultaneously coat both sides of the strip with the passivation solution. The take-up roller 5 and the coating roller 6 are each fixed to the frame by bearing seats and other related mechanical components, and the rollers are driven to rotate against each other. The take-up roller 5 is located on the side directly below the coating roller 6, and a portion of the take-up roller 5 is always immersed in the passivation solution in the passivation tank 1. This ensures that the take-up roller 5 can pick up the passivation solution onto the roller surface during rotation and transfer the passivation solution to the roller surface of the coating roller 6 when it rolls against the coating roller 6.

[0029] Correspondingly, two passivation tanks 1 are also symmetrically arranged so that the two sets of material-collecting rollers 5 can pick up the passivation liquid. The passivation tank 1 includes a first bottom plate 101 and four side plates 102. The ends of the four side plates 102 are fixedly connected to form a rectangular frame. The first bottom plate 101 is fixed to the bottom end of the rectangular frame. In this embodiment, the side plates 102 of the passivation tank 1 near the strip and the side plates 102 away from the strip are both inclined. An overflow groove 103 with an upward opening is opened on the edge of the passivation tank 1 near the strip. The overflow groove 103 is opened on the side plate 102 of the passivation tank 1 near the strip. Figure 2 As shown, the width of the overflow trough 103 is smaller than the width of the side plate 102. The passivation liquid in the passivation tank 1 flows into the overflow tank 2 located on this side through the overflow trough 103. The overflow tank 2 is located on the side directly below the passivation tank 1, and the width of the overflow tank 2 is equal to the width of the passivation tank 1. A filter screen 9 for filtering the passivation liquid is provided in the overflow tank 2. An outlet 201 is provided at the bottom of the overflow tank 2, located below the filter screen 9. The filtered passivation liquid flows out of the overflow tank 2 through the outlet 201.

[0030] The passivation tank 1 is provided with a liquid inlet pipe 4 for conveying the passivation liquid into the passivation tank 1 on the side away from the strip steel, and the overflow tank 2 is provided with a conveying pump 3, the inlet of the conveying pump 3 is communicated with the liquid outlet 201 at the bottom of the overflow tank 2, and the outlet of the conveying pump 3 is communicated with the liquid inlet pipe 4, in the embodiment, the inlet of the conveying pump 3 is communicated with the liquid outlet 201 through a first conveying pipe 301, and the outlet of the conveying pump 3 is communicated with the liquid inlet pipe 4 through a second conveying pipe 302. Figure 1 As shown in the figure, the passivation liquid in the passivation tank 1 on the left side of the strip steel flows from left to right, the overflow tank 2 is located on the side where the withdrawal roll 5 enters the passivation tank 1, the liquid inlet pipe 4 is located on the side where the withdrawal roll 5 leaves the passivation tank 1, the withdrawal roll 5 sticks to the tiny impurities after passing through the coating roll 6, the tiny impurities enter the passivation tank 1 along with the withdrawal roll 5, the passivation liquid drives the tiny impurities to flow towards the overflow tank 103 and enter the overflow tank 2 for filtration, that is, the impurities can be removed in time to ensure the cleanliness of the passivation liquid. The liquid inlet pipe 4 is located on the side where the withdrawal roll 5 leaves the passivation liquid, that is, the withdrawal roll 5 sticks to the clean passivation liquid, thereby improving the uniformity of the passivation liquid on the strip steel.

[0031] In the embodiment, the liquid inlet pipe 4 is located in the passivation tank 1 and is fixedly connected with the inner wall of the passivation tank 1, specifically, the liquid inlet pipe 4 is a tubular structure with one end closed and one end open, the axis of the liquid inlet pipe 4 is parallel to the axis of the withdrawal roll 5, and the length of the liquid inlet pipe 4 is equal to the width of the inner cavity of the passivation tank 1; the opening of the liquid inlet pipe 4 is communicated with the outlet of the conveying pump 3, a plurality of liquid outlet holes 401 are formed in the side wall of the liquid inlet pipe 4 and are distributed along the axial direction of the liquid inlet pipe 4, and the conveying pump 3 conveys the filtered passivation liquid into the liquid inlet pipe 4 and then into the passivation tank 1 through the liquid outlet holes 401.

[0032] The liquid level fluctuation of the passivation tank 1 easily causes the coating of the withdrawal roll 5 to be insufficient, therefore, in order to reduce the fluctuation of the liquid level, part of the liquid inlet pipe 4 is located in the passivation liquid in the passivation tank 1, the liquid outlet holes 401 are located below the liquid level of the passivation tank 1 and face the bottom of the passivation tank 1, and under the condition that the passivation liquid flows, the fluctuation of the liquid level in the passivation tank 1 is reduced, and the uniformity of the coating of the strip steel is improved.

[0033] The above is the basic implementation manner of the utility model, which can be further improved, optimized and limited on the basis to obtain the following embodiments:

[0034] Embodiment 2

[0035] The embodiment is an improved scheme based on the embodiment 1, the main structure of which is the same as that of the embodiment 1, and the improvement lies in that: Figure 2As shown, the overflow groove 103 is provided with a flow guide plate 7 at the inclined position, the top end of the flow guide plate 7 is fixedly connected with the outer side wall of the passivation tank 1, the bottom end of the flow guide plate 7 extends into the overflow tank 2, and the acute angle formed between the extension direction of the flow guide plate 7 and the vertical direction is 30-50°. In the embodiment, the flow guide plate 7 includes an arc-shaped plate 701, the two sides of the arc-shaped plate 701 are integrally connected with baffle plates 702, the spacing between the two baffle plates 702 is greater than the width of the overflow groove 103, and the height of the baffle plate 702 is higher than the height of the bottom of the overflow groove 103, so as to ensure that the passivation liquid flowing out of the overflow groove 103 all passes through the flow guide plate 7 and enters the overflow tank 2, and avoid the passivation liquid flowing out along the outer side wall of the passivation tank 1, thereby causing the passivation liquid to overflow.

[0036] Embodiment 3

[0037] The embodiment is an improved scheme based on the embodiment 1, and the main structure is the same as that of the embodiment 1, and the improvement lies in that a filter frame 8 located above the filter screen 9 is slidably arranged in the overflow tank 2, the filter frame 8 can slide along the height direction of the overflow tank 2, and the passivation liquid overflowing from the passivation tank 1 flows into the overflow tank 2 after passing through the filter frame 8. The filter frame 8 includes four vertical plates 802, the end portions of the four vertical plates 802 are connected to form a rectangular frame body with open ends, the vertical plates 802 are welded or integrally connected, and the bottom end of the rectangular frame body is provided with a filter bottom net 801. The inner side wall of the overflow tank 2 is provided with a sliding groove extending along the height direction thereof, the number of the sliding grooves is two and the sliding grooves are symmetrically arranged on the two side walls of the overflow tank 2, and the filter frame 8 is provided with sliding blocks 803 capable of sliding along the sliding grooves, and the sliding blocks 803 correspond to the sliding grooves one by one.

[0038] A plurality of hooks 901 capable of being hung on the side wall of the overflow tank 2 are fixedly arranged on the filter screen 9, and a groove 202 through which the filter screen 9 passes is arranged on one side wall of the overflow groove 103, the hooks 901 are hung on the bottom of the groove 202, and the filter frame 8 has a certain gap with the side wall.

[0039] When the filter frame 8 needs to be cleaned, the filter frame 8 is directly lifted until the sliding block 803 slides out of the sliding groove, at this time, the passivation liquid flowing out of the overflow groove 103 reenters the passivation tank 1 after being filtered by the filter screen 9 without stopping work; when the filter screen 9 needs to be cleaned, the filter frame 8 is lifted to ensure that the sliding block 803 is always located in the sliding groove, when the bottom end of the filter frame 8 is higher than the bottom of the groove 202, the filter screen 9 is lifted and taken out through the groove 202, and in this process, the passivation liquid flowing out of the overflow groove 103 enters the overflow tank 2 after being filtered by the filter frame 8. That is, the arrangement of the filter frame 8 and the filter screen 9 ensures that the filter frame 8 and the filter screen 9 can be cleaned respectively without stopping work.

[0040] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A passivation device for strip steel, comprising a passivation tank (1) for holding passivation liquid, wherein above the passivation tank (1) are a take-up roller (5) for taking passivation liquid from the passivation tank (1) and a coating roller (6) opposite to the take-up roller (5) for coating the passivation liquid onto the surface of the strip steel, the coating roller (6) and the take-up roller (5) are two sets and symmetrically arranged on both sides of the strip steel, the strip steel vertically passes through the coating channel formed between the two coating rollers (6) from bottom to top, so that the two sets of coating rollers (6) simultaneously coat both sides of the strip steel with passivation liquid, characterized in that: The passivation tank (1) has an overflow trough (103) near the edge of the strip steel. The passivation liquid in the passivation tank (1) flows into the overflow tank (2) located on the same side through the overflow trough (103). The passivation tank (1) is provided with an inlet pipe (4) for conveying the passivation liquid into the passivation tank (1) on the side away from the strip steel. The overflow tank (2) is provided with a filter screen (9). The overflow tank (2) is provided with a delivery pump (3). The inlet of the delivery pump (3) is connected to the outlet (201) at the bottom of the overflow tank (2). The outlet of the delivery pump (3) is connected to the inlet pipe (4).

2. The passivation device for strip steel as described in claim 1, characterized in that: A guide plate (7) is inclinedly provided at the overflow trough (103). The top end of the guide plate (7) is fixedly connected to the outer wall of the passivation tank (1), and the bottom end of the guide plate (7) extends into the overflow tank (2).

3. The passivation device for strip steel as described in claim 2, characterized in that: The acute angle formed by the extension direction of the guide plate (7) and the vertical direction is 30-50°.

4. The passivation device for strip steel as described in claim 1, characterized in that: The inlet pipe (4) is a tubular structure with one end closed and the other end open. The opening of the inlet pipe (4) is connected to the outlet of the delivery pump (3). Multiple outlet holes (401) are provided on the side wall of the inlet pipe (4) along its axial direction.

5. The passivation device for strip steel as described in claim 4, characterized in that: The liquid outlet (401) is located below the liquid surface of the passivation tank (1) and faces the bottom of the passivation tank (1).

6. The passivation device for strip steel as described in claim 1, characterized in that: The overflow pool (2) is slidably provided with a filter frame (8) located above the filter screen (9). The passivation liquid overflowing from the passivation pool (1) flows through the filter frame (8) and enters the overflow pool (2).

7. A passivation device for strip steel as described in claim 6, characterized in that: The filter frame (8) includes four vertical plates (802), the ends of which are connected to form a rectangular frame with openings at both ends, and a filter bottom mesh (801) is provided at the bottom of the rectangular frame.

8. The passivation device for strip steel as described in claim 6, characterized in that: The overflow pool (2) has a groove extending along its height on its inner sidewall, and the filter frame (8) is provided with a slider (803) that can slide along the groove.

9. A passivation device for strip steel as described in claim 1, characterized in that: The filter screen (9) is fixedly provided with several hooks (901) that can be hung on the side wall of the overflow pool (2).

10. A passivation device for strip steel as described in claim 1, characterized in that: The inlet of the delivery pump (3) is connected to the outlet (201) through the first delivery pipe (301), and the outlet of the delivery pump (3) is connected to the inlet pipe (4) through the second delivery pipe (302).

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