A cavity phosphating post-discharge structure

Abstract

The application discloses a cavity phosphating post-drainage structure and relates to the technical field of metal surface treatment. The application improves the problem that the phosphating residue in the cavity of a workpiece after phosphating is difficult to be effectively drained, thereby causing pollution of subsequent tank liquid and affecting the quality of electrophoretic coating. The application comprises a phosphating tank, a support frame arranged on the phosphating tank, a conveyor arranged on the support frame, and a drainage station. The conveyor is slidably connected with a conveying rod and a swing rod for suspending the workpiece. The swing rod is hingedly connected to the bottom end of the conveying rod. The support frame comprises support rods arranged on the top of the phosphating tank. The support rods are arranged in multiple groups and are arranged in the length direction of the phosphating tank. The phosphating tank comprises a tank outlet. The drainage station is located at the tank outlet. The support rods at the tank outlet are provided with inclined members for pushing the swing rod to swing. The application has the effect of avoiding the phosphating residue in the workpiece from entering the subsequent washing tank.

Description

Technical Field

[0001] This application relates to the field of metal surface treatment technology, and in particular to a drainage structure for use after cavity phosphating. Background Technology

[0002] In the production of electrophoretic coating for metal products, phosphating pretreatment is a crucial step. By forming a uniform and dense phosphating film on the surface of the workpiece substrate, it provides an excellent adhesion base and anti-corrosion barrier for the electrophoretic coating.

[0003] However, existing phosphating processes often encounter drainage problems in the post-phosphating treatment stage when processing workpieces with complex cavity structures, such as compressor housings. When the workpiece is slowly lifted from the phosphating tank by a conveyor and transferred to the electrophoresis tank, the complex structure of the workpiece's internal cavity may trap phosphating solution. This trapped liquid usually contains phosphating sludge produced by tank aging or reaction. After entering the washing tank with the workpiece, this not only contaminates the washing water but also, upon entering the electrophoresis tank, damages the stability of the electrophoretic paint and may adhere to the workpiece surface during electrophoresis, leading to defects such as particles and pinholes in the final electrophoretic coating. Therefore, there is an urgent need for a drainage structure for cavity phosphating that can effectively remove the sludge-containing droplets trapped within the phosphated workpiece cavity. Utility Model Content

[0004] In order to improve the problem in the prior art that the slag-containing phosphating solution entrained in the workpiece cavity after phosphating is difficult to effectively drain, which leads to the contamination of subsequent bath solutions and affects the quality of electrophoretic coating, this application provides a drainage structure for the cavity after phosphating.

[0005] This application provides a drainage structure for use after phosphating in a cavity, employing the following technical solution:

[0006] A drainage structure for cavity phosphating includes a phosphating tank and a support frame set on the phosphating tank, a conveyor set on the support frame, and a drainage station. The conveyor is slidably connected to a conveying rod and a swing rod for suspending the workpiece. The swing rod is hinged to the bottom end of the conveying rod.

[0007] The support frame includes a support rod disposed on the top of the phosphating tank, and the support rod is arranged in multiples, with two in a group, spaced apart along the length of the phosphating tank.

[0008] The phosphating tank includes an outlet, the drain station is located at the outlet, and the support rod located at the outlet is equipped with an inclined component for pushing the swing rod to swing.

[0009] Preferably, the swing rod and the conveying rod are connected by a ball joint.

[0010] Preferably, there are at least two sets of tilting members, which are spaced apart along the workpiece conveying direction.

[0011] Preferably, the tilting member includes two mounting rods fixed horizontally to the support rod, a stop rod slidably connected to the mounting rod, and a return spring sleeved on the stop rod. The mounting rod has a receiving groove that fully accommodates the stop rod and the return spring. One end of the return spring abuts against the stop rod and the other end of the return spring abuts against the receiving groove. The stop rod is provided with an inclined surface for the swing rod to abut against and push into the receiving groove. A limiting component for preventing the stop rod from disengaging from the receiving groove is provided between the stop rod and the receiving groove.

[0012] Preferably, the limiting component includes a first stop block disposed at one end of the stop bar and a second stop block fixed at the opening of the receiving groove. Initially, the first stop block abuts against the second stop block, and the adjacent stop bars abut against each other.

[0013] Preferably, anti-splash plates are provided on both sides of the phosphating tank at the outlet.

[0014] Preferably, the phosphating tank is provided with a guide plate at an angle at the outlet.

[0015] In summary, this application includes at least one of the following beneficial effects:

[0016] 1. This application uses an inclined component to push the swing component to tilt before the workpiece leaves the outlet of the phosphating tank, so that its internal cavity faces downwards. This forces the slag-containing phosphating liquid entrained in the cavity to be completely discharged before entering the water washing tank and directly returned to the phosphating tank. This avoids the workpiece carrying phosphating sludge into the subsequent water washing tank, thereby preventing harmful impurities from being carried into the electrophoresis tank and ensuring the chemical stability of the electrophoretic paint.

[0017] 2. This application uses an inclined component consisting of a mounting rod, a stop rod, a return spring, and an inclined plane to form a purely mechanical passive drive system. It does not require external power and can complete the automatic tilting and resetting of the workpiece using only the traveling power of the conveyor itself. It has the advantages of low cost, low failure rate, and easy maintenance.

[0018] 3. The ball joint connects the conveyor rod and the swing rod, giving the swing rod multi-directional movement and ensuring smooth operation. Through the continuous action of at least two sets of tilting parts, sufficient static drainage time is provided for the workpiece, which can efficiently and stably drain the residual liquid in the complex cavity. This fundamentally eliminates defects such as electrophoretic coating particles and shrinkage cavities caused by phosphating slag adhesion. While improving the first-pass yield of products, it also saves the subsequent manual cleaning or rework process, thus improving the overall production efficiency. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the drainage structure located at the outlet of this embodiment of the application;

[0020] Figure 2 This is a schematic diagram of the transverse cross-section of the inclined member and the support rod in this embodiment of the application.

[0021] Explanation of reference numerals in the attached drawings: 1. Phosphating tank; 11. Outlet; 12. Splash guard; 13. Guide plate; 2. Support frame; 21. Support rod; 3. Conveyor; 31. Conveying rod; 32. Swing rod; 4. Inclined component; 41. Mounting rod; 411. Receiving tank; 42. Stop bar; 421. Inclined surface; 43. Return spring; 5. Limiting assembly; 51. First stop block; 52. Second stop block. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0024] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0025] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0026] In addition, the term "multiple" should mean two or more.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] This application discloses a drainage structure for use after phosphating a workpiece in a cavity, aiming to improve the problem in the prior art where the slag-containing phosphating solution entrained in the workpiece cavity after phosphating is difficult to effectively drain, leading to contamination of subsequent bath solutions and affecting the quality of electrophoretic coating. The drainage structure includes a phosphating tank 1, a support frame 2 mounted on the phosphating tank 1, a conveyor 3 mounted on the support frame 2, and a drainage station. The support frame 2 includes multiple support rods 21 mounted on the top of the phosphating tank 1, with two rods arranged in pairs at intervals along the length of the phosphating tank 1. The phosphating tank 1 includes an outlet 11, and the drainage station is located at the outlet 11.

[0029] Specifically, the conveyor 3 is slidably connected to a conveyor rod 31 and a swing rod 32 for suspending the workpiece. The swing rod 32 is hinged to the bottom end of the conveyor rod 31. In this embodiment, the swing rod 32 and the conveyor rod 31 are connected by a ball joint, which enables the swing rod 32 to have multi-directional movement and ensures smooth operation.

[0030] Furthermore, in this embodiment, there are two sets of support rods 21 located at the outlet 11 (only one set of support rods 21 is shown in the figure), which are spaced apart along the conveying direction of the workpiece. The support rods 21 are provided with inclined members 4, which are used to push the swing rod 32 to swing. Through the continuous action of at least two sets of inclined members 4, sufficient static drainage time is provided for the workpiece, which can efficiently and stably drain the residual liquid in the complex cavity.

[0031] Specifically, the tilting member 4 includes a mounting rod 41 fixed horizontally to the support rod 21, a stop rod 42 slidably connected to the mounting rod 41, and a return spring 43 sleeved on the stop rod 42. The mounting rod 41 has a receiving groove 411 that fully accommodates the stop rod 42 and the return spring 43. One end of the return spring 43 abuts against the stop rod 42, and the other end of the return spring 43 abuts against the receiving groove 411. The stop rod 42 is provided with an inclined surface 421 for the swing rod 32 to abut against and push into the receiving groove 411. A limit assembly 5 is provided between the stop rod 42 and the receiving groove 411 to prevent the stop rod 42 from disengaging from the receiving groove 411.

[0032] Specifically, the limiting component 5 includes a first stop 51 fixed to one end of the stop bar 42 and a second stop 52 fixed to the opening of the receiving groove 411. Initially, the first stop 51 abuts against the second stop 52, and adjacent stop bars 42 abut against each other.

[0033] In addition, two splash guards 12 are provided on both sides of the phosphating tank 1 at the outlet 11 to prevent the phosphating liquid from splashing. A guide plate 13 is inclined at the outlet 11 of the phosphating tank 1 to guide the discharged phosphating liquid back to the phosphating tank 1. During installation, the two splash guards 12 are located on both sides of the guide plate 13.

[0034] The implementation principle of a drainage structure for cavity phosphating disclosed in this application is as follows:

[0035] After the workpiece completes the phosphating treatment in the phosphating tank 1, the conveyor 3 drives the conveyor rod 31 and the swing rod 32 to move. When the workpiece moves to the discharge position at the outlet 11, the swing rod 32 contacts the stop rod 42 of the inclined member 4. Under the action of the inclined surface 421, the stop rod 42 is pushed into the receiving tank 411, and at the same time, the return spring 43 is compressed. The swing rod 32 tilts under the push of the stop rod 42, so that the internal cavity of the workpiece faces downwards, forcing the slag-containing phosphating liquid entrained in the cavity to be discharged and directly returned to the phosphating tank 1.

[0036] After the swing rod 32 passes the stop rod 42, the stop rod 42 returns to its original position under the action of the return spring 43, ready for the next action. Through the continuous action of at least two sets of tilting parts 4, sufficient static drainage time is ensured for the workpiece, enabling efficient and stable emptying of residual liquid in complex cavities.

[0037] With a purely mechanical passive drive system, no external power is required. The automatic tilting and resetting of the workpiece can be completed using only the traveling power of the conveyor 3 itself. It has the advantages of low cost, low failure rate and easy maintenance, and fundamentally eliminates defects such as electrophoretic coating particles and shrinkage cavities caused by phosphate slag adhesion.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A drainage structure for use after phosphating in a cavity, comprising a phosphating tank (1) and a support frame (2) disposed on the phosphating tank (1), and a conveyor (3) disposed on the support frame, characterized in that: It also includes a drain station, wherein the conveyor (3) is slidably connected to a conveyor rod (31) and a swing rod (32) for suspending the workpiece, and the swing rod (32) is hinged to the bottom end of the conveyor rod (31); The support frame (2) includes a support rod (21) disposed on the top of the phosphating tank (1), and there are multiple support rods (21) arranged in pairs along the length direction of the phosphating tank (1). The phosphating tank (1) includes an outlet (11), the drain station is located at the outlet (11), and the support rod (21) located at the outlet (11) is provided with an inclined member (4) for pushing the swing rod (32) to swing.

2. The drainage structure for use after phosphating of a cavity according to claim 1, characterized in that: The swing rod (32) and the conveying rod (31) are connected by a ball joint.

3. The drainage structure for use after phosphating of a cavity according to claim 1, characterized in that: There are at least two sets of the tilting members (4), which are spaced apart along the workpiece conveying direction.

4. The drainage structure for use after phosphating of a cavity according to claim 3, characterized in that: The inclined member (4) includes two mounting rods (41) fixed horizontally to the support rod (21), a stop rod (42) slidably connected to the mounting rod (41), and a return spring (43) sleeved on the stop rod (42). The mounting rod (41) has a receiving groove (411) that fully accommodates the stop rod (42) and the return spring (43). One end of the return spring (43) abuts against the stop rod (42) and the other end of the return spring (43) abuts against the receiving groove (411). The stop rod (42) is provided with an inclined surface (421) for the swing rod (32) to abut against and push into the receiving groove (411). A limiting component (5) is provided between the stop rod (42) and the receiving groove (411) to prevent the stop rod (42) from disengaging from the receiving groove (411).

5. The drainage structure for use after phosphating of a cavity according to claim 4, characterized in that: The limiting component (5) includes a first stop (51) disposed at one end of the stop bar (42) and a second stop (52) fixed at the opening of the receiving groove (411). Initially, the first stop (51) abuts against the second stop (52), and the adjacent stop bars (42) abut against each other.

6. The drainage structure for use after phosphating of a cavity according to claim 1, characterized in that: Splash guards (12) are provided on both sides of the phosphating tank (1) at the outlet (11).

7. The drainage structure for use after phosphating of a cavity according to claim 1, characterized in that: The phosphating tank (1) is provided with a guide plate (13) at an inclined position at the outlet (11).

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