A chromium-free stainless steel passivation uniform treatment device

Abstract

The utility model discloses a chromium -free stainless steel passivation even processing device relates to stainless steel passivation technical field, including the box body of storage passivation liquid and the fixed connection of its both ends respectively and the receiving bin of feeding frame, the inner wall of box body is provided with the heating rod and is provided with the feeding mechanism in it, the upper side of box body and located the middle part top fixed connection of feeding mechanism has the pressing material mechanism, the utility model discloses the reduction gear motor provides stable power, and cooperation initiative roller group, driven roller group drive conveyer belt uniform speed transmission, ensure that the conveying rhythm is controllable, and the recessed frame makes the conveyer belt sink into passivation liquid with arc frame, and the workpiece is separated by the combination baffle group, avoids the collision stack, and guarantees complete immersion, the bracket of pressing material mechanism accurate insertion baffle group gap, effectively suppresses the workpiece floating, and the temperature of box heating rod regulation and control, provides suitable environment for the reaction, realizes tubular or complex workpiece even passivation as a whole, improves the processing quality and consistency.

Description

Technical Field

[0001] This utility model relates to the field of stainless steel passivation technology, and in particular to a device for uniform passivation treatment of chromium-free stainless steel. Background Technology

[0002] Although stainless steel possesses a certain degree of corrosion resistance, its surface may still have micro-defects (such as rolling scratches and uneven oxide layer), making it susceptible to localized corrosion (such as pitting and crevice corrosion) in humid, acidic, or alkaline environments. Therefore, passivation treatment is necessary to form a dense and stable oxide film on its surface, thereby improving its corrosion resistance.

[0003] However, when using spraying for passivation, it is difficult to precisely control the spraying pressure and angle. For stainless steel workpieces with complex structures, such as pipe fittings, "spraying dead zones" are likely to appear on the surface, and the passivation film thickness can vary by 2-5μm, which directly affects the corrosion resistance. Utility Model Content

[0004] The purpose of this invention is to solve the problems existing in the prior art by proposing a chromium-free stainless steel passivation uniform treatment device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a chromium-free stainless steel passivation uniform treatment device, comprising a tank for storing passivation liquid and a feeding rack and a receiving bin fixedly connected to its two ends respectively. The inner wall of the tank is provided with a heating rod and a feeding mechanism is provided inside it. A pressing mechanism is fixedly connected to the upper side of the tank and above the middle of the feeding mechanism. A liquid treatment mechanism is provided on the side of the tank. The feeding mechanism includes a geared motor, a conveyor belt, a partition group, a drive roller group, an inner concave frame, an inner frame, an arc frame, a driven roller group, and a fixing rod. The middle part of the inner concave frame is recessed inward and submerged in the passivation liquid. The output shaft of the geared motor is drivenly connected to the drive roller group. The drive roller group and the driven roller group are rotatably connected to the two ends of the inner concave frame respectively. The conveyor belt is arranged outside the drive roller group and the driven roller group. The conveyor belt is constrained by multiple sets of arc frames and bent according to the shape of the inner concave frame. Multiple sets of partition groups are parallel to each other and fixedly connected to the outer side of the conveyor belt along the track of the conveyor belt.

[0006] Preferably, multiple sets of the built-in frames are fixedly connected to the edge of the recessed frame and located inside the conveyor belt, and the fixing rods fix the recessed frame to the inner wall of the box.

[0007] Preferably, the active roller group and the driven roller group are rotatably connected to both ends of the housing, and the geared motor is fixedly installed on the outside of the housing.

[0008] Preferably, the pressing mechanism includes a reinforcing plate, a mounting frame, and bracket frames. Multiple sets of bracket frames are parallel to each other and fixedly connected to the lower side of two sets of mounting frames. The two sets of mounting frames are respectively fixedly connected to the upper two edges of the housing.

[0009] Preferably, the reinforcing plate is fixedly connected to the middle of multiple sets of bracket frames, and the bracket frames are located in the gaps between the partition groups.

[0010] Preferably, the liquid handling mechanism includes an inlet pipe, a side chamber, and a return pipe. Multiple sets of through holes are arrayed on one side of the chamber, and the side chamber is fixedly connected to that side of the chamber.

[0011] Preferably, the inlet pipe is fixedly connected to the upper part of one end of the side box, one end of the return pipe is fixedly connected to the lower part of the other end of the side box, and the other end of the return pipe is fixedly connected to the bottom of the receiving chamber.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows: 1. In this utility model, the efficient and stable passivation of workpieces is achieved through the coordinated design of the feeding mechanism and the pressing mechanism. The geared motor provides stable power, which, together with the active roller group and the driven roller group, drives the conveyor belt to transmit at a uniform speed, ensuring that the conveying rhythm is controllable. The concave frame and the arc frame immerse the conveyor belt in the passivation liquid, and the partition group separates the workpieces to avoid collision and stacking, ensuring complete immersion. The bracket frame of the pressing mechanism is precisely inserted into the gap of the partition group to effectively suppress the workpiece from floating. The heating rod in the box regulates the temperature and provides a suitable environment for the reaction. Overall, the tubular or complex workpieces are uniformly passivated, improving the processing quality and consistency.

[0013] 2. In this invention, the side chamber provides an independent preparation space, allowing for precise solvent injection via the inlet pipe, facilitating the preparation of passivation solutions of specific concentrations. Multiple through-holes in the chamber ensure uniform flow of the passivation solution, avoiding localized concentration differences. The return pipe connects the receiving chamber to the side chamber, efficiently recovering residual passivation solution from the workpiece and recycling it, reducing waste. The varying heights of the side chamber promote natural liquid flow, improving circulation efficiency. This achieves precise preparation, stable supply, and efficient recovery of the passivation solution, ensuring consistency in batch processing and reducing costs. Attached Figure Description

[0014] Figure 1 This utility model presents a first three-dimensional structural schematic diagram of a chromium-free stainless steel passivation uniform treatment device. Figure 2 This utility model provides a second three-dimensional structural schematic diagram of a chromium-free stainless steel passivation uniform treatment device. Figure 3 This utility model provides a three-dimensional structural diagram of the feeding mechanism and the pressing mechanism in a chromium-free stainless steel passivation uniform treatment device. Figure 4This invention presents a three-dimensional structural diagram of the feeding mechanism in a chromium-free stainless steel passivation uniform treatment device.

[0015] Legend: 1. Box body; 2. Feeding rack; 3. Pressing mechanism; 31. Reinforcing plate; 32. Mounting frame; 33. Bracket frame; 4. Liquid handling mechanism; 41. Liquid inlet pipe; 42. Side box; 43. Through hole; 44. Return pipe; 5. Receiving bin; 6. Feeding mechanism; 61. Gear motor; 62. Conveyor belt; 63. Baffle assembly; 64. Driven roller assembly; 65. Concave frame; 66. Internal frame; 67. Arc frame; 68. Driven roller assembly; 69. Fixing rod. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0017] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0018] Example 1: As Figure 1 - Figure 4As shown, this utility model provides a chromium-free stainless steel passivation uniform treatment device, including a tank 1 for storing passivation liquid and a feeding rack 2 and a receiving bin 5 fixedly connected to its two ends. A heating rod is provided on the inner wall of the tank 1, and a feeding mechanism 6 is provided inside it. A pressing mechanism 3 is fixedly connected to the upper side of the tank 1, above the middle of the feeding mechanism 6. A liquid treatment mechanism 4 is provided on the side of the tank 1. The feeding mechanism 6 includes a reduction motor 61, a conveyor belt 62, a partition group 63, a drive roller group 64, an inner concave frame 65, an inner frame 66, an arc-shaped frame 67, a driven roller group 68, and a fixing rod 69. The inner concave frame 65 is recessed inward in the middle and submerged in the passivation liquid. The output shaft of the reduction motor 61 is connected to the drive roller group 64. The drive roller group 64 and the driven roller group 68 are rotatably connected to the two ends of the inner concave frame 65. The conveyor belt 62 is arranged between the drive roller group 64 and the driven roller group 68. On the outside of 68, the conveyor belt 62 is bent according to the shape of the concave frame 65 by multiple sets of arc-shaped frames 67. Multiple sets of partition groups 63 are parallel to each other and fixedly connected to the outside of the conveyor belt 62 along the track of the conveyor belt 62. Multiple sets of internal frames 66 are fixedly connected to the edge of the concave frame 65 and located inside the conveyor belt 62. The fixing rod 69 fixes the concave frame 65 to the inner wall of the box 1. The active roller group 64 and the driven roller group 68 are rotatably connected to both ends of the box 1. The reduction motor 61 is fixedly installed on the outside of the box 1. The pressing mechanism 3 includes a reinforcing plate 31, a mounting frame 32 and a bracket frame 33. Multiple sets of bracket frames 33 are parallel to each other and fixedly connected to the lower side of two sets of mounting frames 32. The two sets of mounting frames 32 are respectively fixedly connected to the upper two edges of the box 1. The reinforcing plate 31 is fixedly connected to the middle of the multiple sets of bracket frames 33. The bracket frame 33 is located in the gap of the partition group 63.

[0019] The specific settings and functions of this embodiment are described below: The geared motor 61 provides stable power for speed reduction and torque increase, driving the active roller group 64 to rotate, and working with the driven roller group 68 to achieve smooth transmission of the conveyor belt 62, ensuring that the workpiece conveying speed is uniform and controllable; the recessed design in the middle of the concave frame 65, together with the arc frame 67, limits the bending of the conveyor belt 62, so that the middle section of the conveyor belt 62 is stably submerged in the passivation liquid, ensuring that the workpiece can be completely submerged when pushed by the partition group 63; multiple sets of built-in frames 66 are fixed on the edge of the concave frame 65 and located inside the conveyor belt 62, which can support the conveyor belt 62 and prevent it from being damaged by the weight of the workpiece. The liquid buoyancy may shift, further improving the conveying stability; the fixing rod 69 firmly fixes the concave frame 65 to the inner wall of the box 1, ensuring that the overall structure of the feeding mechanism 6 does not loosen during long-term operation; in the pressing mechanism 3, the mounting bracket 32 ​​stably fixes the bracket frame 33 inside the box 1, ensuring that the bracket frame 33 is accurately inserted into the gap of the partition group 63, and the reinforcing plate 31 enhances the overall rigidity of the multiple bracket frames 33, preventing them from deforming due to workpiece collision or liquid impact, thereby reliably suppressing workpiece floating; at the same time, the heating rod on the inner wall of the box 1 can adjust the temperature of the passivation liquid, providing a suitable environment for the passivation reaction. In summary, the various components work together to achieve stable conveying, complete immersion, and uniform reaction of tubular and complex workpieces in the passivation liquid, with no collision or stacking between workpieces, significantly improving the uniformity and stability of the passivation treatment.

[0020] Example 2: Figure 1 - Figure 2 As shown, the liquid handling mechanism 4 includes an inlet pipe 41, a side box 42, and a return pipe 44. Multiple sets of through holes 43 are arrayed on one side of the box body 1. The side box 42 is fixedly connected to this side of the box body 1. The inlet pipe 41 is fixedly connected to the upper part of one end of the side box 42. One end of the return pipe 44 is fixedly connected to the lower part of the other end of the side box 42. The other end of the return pipe 44 is fixedly connected to the bottom of the receiving chamber 5.

[0021] The overall effect of this embodiment is that the side chamber 42 is fixedly connected to the side of the chamber 1, providing an independent space for the preparation of the passivation solution and ensuring liquid flow through a stable connection with the chamber 1; the liquid inlet pipe 41 is located at the upper part of one end of the side chamber 42, facilitating precise injection of solvent (water), which, together with the solute added to the side chamber 42, can be easily prepared into a passivation solution of a specific concentration; multiple sets of through holes 43 arrayed on one side of the chamber 1 allow the passivation solution in the side chamber 42 to flow into the chamber 1 evenly and stably, avoiding localized concentrations. The concentration of passivating solution within the tank 1 is kept consistent, preventing it from being too high or too low. The return pipe 44 connects one end to the lower part of the side tank 42 and the other end to the bottom of the receiving chamber 5, efficiently recovering residual passivating solution dripping from the workpiece after settling in the receiving chamber 5. This solution is then reintroduced into the tank 1 via the side tank 42 for reuse, reducing waste and maintaining a stable total amount of passivating solution within the tank 1. Furthermore, the height difference at both ends of the side tank 42 (inlet at the top, return at the bottom) promotes natural liquid flow and improves circulation efficiency. In summary, this mechanism achieves precise formulation, uniform supply, efficient recovery, and stable circulation of the passivating solution, providing a stable liquid environment for continuous passivation of batches of workpieces and further ensuring the consistency and economy of the passivation effect.

[0022] The operating method and working principle of this device are as follows: The solute portion of the passivation solution is placed in the side tank 42. Water is injected into the side tank 42 through the inlet pipe 41 to prepare a passivation solution of a specific concentration. The passivation solution enters the tank 1 through multiple sets of through holes 43, gradually submerging the feeding mechanism 6. After the heating rod in the tank 1 is activated, the reduction motor 61 is started. The reduced speed and increased torque of the reduction motor 61 drive the active roller group 64 to rotate slowly. With the cooperation of the driven roller group 68, the conveyor belt 62 and its outer side multiple sets of parallel baffle groups 63 rotate, placing the previously cleaned and pre-treated tubular or complex workpieces from the feed rack 2. When one set of baffle groups 63 rotates to… When driven by roller group 68, the workpiece is pushed into the box 1. The conveyor belt 62 is installed in the concave frame 65 in the middle. It is bent at the turning point of the concave frame 65 by multiple sets of arc frames 67. Therefore, the workpiece is pushed into the middle of the concave frame 65 by the partition group 63. Multiple sets of bracket frames 33 are parallel to each other and distributed in the gaps of the partition group 63 to prevent the workpiece from floating due to buoyancy. The workpiece is immersed in the passivation liquid for passivation. After a period of time, the workpiece is pushed out of the passivation liquid by the partition group 63 and enters the receiving chamber 5. After standing for a period of time, the residual passivation liquid enters the return pipe 44 from the receiving chamber 5 and is collected in the side box 42. Finally, it returns to the box 1 to continue to participate in the subsequent passivation treatment.

[0023] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A chromium-free stainless steel passivation uniform treatment device, comprising a tank (1) for storing passivation liquid and a feeding rack (2) and a receiving bin (5) fixedly connected to its two ends, characterized in that: The inner wall of the box (1) is provided with a heating rod and a feeding mechanism (6) is provided inside it. A pressing mechanism (3) is fixedly connected to the upper side of the box (1) and above the middle of the feeding mechanism (6). A liquid handling mechanism (4) is provided on the side of the box (1). The feeding mechanism (6) includes a geared motor (61), a conveyor belt (62), a partition group (63), a drive roller group (64), an inner recessed frame (65), an inner frame (66), an arc frame (67), a driven roller group (68), and a fixing rod (69). The middle of the inner recessed frame (65) faces towards The recess is submerged in the passivation liquid. The output shaft of the geared motor (61) is connected to the drive roller group (64). The drive roller group (64) and the driven roller group (68) are rotatably connected to both ends of the recessed frame (65). The conveyor belt (62) is set outside the drive roller group (64) and the driven roller group (68). The conveyor belt (62) is bent according to the shape of the recessed frame (65) by multiple sets of arc frames (67). Multiple sets of partition groups (63) are parallel to each other and fixedly connected to the outside of the conveyor belt (62) along the track of the conveyor belt (62).

2. The chromium-free stainless steel passivation uniform treatment device according to claim 1, characterized in that: Multiple sets of the built-in frames (66) are fixedly connected to the edge of the recessed frame (65) and located inside the conveyor belt (62), and the fixing rod (69) fixes the recessed frame (65) to the inner wall of the box (1).

3. The chromium-free stainless steel passivation uniform treatment device according to claim 2, characterized in that: The active roller group (64) and the driven roller group (68) are rotatably connected to both ends of the housing (1), and the geared motor (61) is fixedly installed on the outside of the housing (1).

4. The chromium-free stainless steel passivation uniform treatment device according to claim 3, characterized in that: The pressing mechanism (3) includes a reinforcing plate (31), a mounting frame (32) and a bracket frame (33). Multiple sets of bracket frames (33) are parallel to each other and fixedly connected to the lower side of two sets of mounting frames (32). The two sets of mounting frames (32) are respectively fixedly connected to the upper two edges of the box body (1).

5. The chromium-free stainless steel passivation uniform treatment device according to claim 4, characterized in that: The reinforcing plate (31) is fixedly connected to the middle of multiple sets of bracket frames (33), and the bracket frames (33) are located in the gaps of the partition group (63).

6. The chromium-free stainless steel passivation uniform treatment device according to claim 5, characterized in that: The liquid handling mechanism (4) includes an inlet pipe (41), a side box (42) and a return pipe (44). Multiple sets of through holes (43) are arrayed on one side of the box (1), and the side box (42) is fixedly connected to that side of the box (1).

7. The chromium-free stainless steel passivation uniform treatment device according to claim 6, characterized in that: The inlet pipe (41) is fixedly connected to the upper part of one end of the side box (42), one end of the return pipe (44) is fixedly connected to the lower part of the other end of the side box (42), and the other end of the return pipe (44) is fixedly connected to the bottom of the receiving chamber (5).

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