Liquid supply circulating device for blackening tank
The liquid supply and circulation device in the blackening tank solves the problem of unstable temperature and concentration of the blackening liquor, achieving stable liquid supply and reduced consumption, thus improving production safety and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- KAIFENG QILI PRESTRESSING EQUIP CO LTD
- Filing Date
- 2025-05-26
- Publication Date
- 2026-06-05
AI Technical Summary
In existing technologies, it is difficult to maintain stable temperature and concentration of blackening solution during tempering of workpieces, leading to increased consumption, safety hazards, and environmental pollution risks.
A liquid supply and circulation device for a blackening tank was designed, including components such as a buffer tank, a weighing tank, a heat exchanger, and a sensor. The device maintains the temperature and concentration of the blackening liquid through circulation and countercurrent heat exchange, and uses a stirring device to maintain the uniformity of the solution, thereby achieving automatic adjustment and control.
It effectively maintains the temperature and concentration of the blackening solution, reduces consumption and safety risks, improves production efficiency, reduces environmental pollution, and is simple to operate and economically beneficial.
Smart Images
Figure CN224325414U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of liquid supply equipment for blackening tanks, and specifically to a liquid supply circulation device for blackening tanks. Background Technology
[0002] To prevent corrosion and rust on steel parts and enhance their surface appearance, the traditional method has been a low-temperature alkaline blackening process. While widely used for many years, this process suffers from drawbacks such as cumbersome operation, high labor intensity, high production costs, severe environmental pollution, and expensive waste treatment. With the rapid development of science and technology, steel blackening agents have emerged as a promising solution. This new process, utilizing the residual heat from metal heat treatment for surface blackening, is increasingly demonstrating its unique advantages and is gaining attention, application, and promotion worldwide. Steel blackening agents are formulated through multiple processes using various cleaning and rust-inhibiting agents, organic colorants, film-forming substances, emulsifying and dispersing agents, and surface additives. After tempering, the workpiece is directly immersed in the blackening solution to complete surface blackening and achieve strong rust prevention. Anchor rings in the prestressed concrete industry require adjustment and blackening treatment.
[0003] The blackening agents successfully applied in existing technologies are water-soluble emulsions. After blackening, no rinsing is required, resulting in no wastewater discharge and no environmental pollution. Furthermore, it forms a continuous operation with the heat treatment process, allowing tempering and blackening to be completed in one step, with the entire blackening process taking only 25-35 seconds. However, during the blackening process after tempering, the blackening agent is inevitably consumed. This consumption comes from two aspects: first, the evaporation of the solvent upon heating, and second, the consumption of the blackening agent itself. The blackening solution in its working state is made by diluting the blackening agent concentrate with water. Because the blackening agent concentrate is an emulsion, the temperature of the workpiece after tempering is relatively high. After the workpiece enters the blackening tank, in addition to uniformly adhering to the blackening solution in its working state, heat exchange occurs between the workpiece and the blackening solution, leading to solvent evaporation and an increase in the solute content of the blackening solution in its working state. This increased solute content not only increases the consumption of the blackening agent concentrate but also raises the temperature of the blackening solution in its working state. Because the blackening solution needs to continuously receive tempered workpieces, if the temperature of the blackening solution continues to rise, the high temperature of the splashed liquid could injure workers, undoubtedly increasing the danger of on-site work. Therefore, there is room for improvement in the existing technology, aiming to maintain the blackening solution at a suitable operating temperature, facilitate heat exchange and cooling with the tempered workpieces, and maintain the blackening solution at a suitable concentration during use to continuously blacken the tempered workpieces. This would reduce the technical problem of the blackening solution itself rising in temperature due to continuous exposure to tempered workpieces during the blackening process. Summary of the Invention
[0004] To address the shortcomings of existing technologies, this invention provides a liquid supply and circulation device that can maintain the blackening liquid in the blackening tank at a suitable temperature and concentration during use, thereby overcoming the deficiencies in existing technologies.
[0005] The technical solution adopted by this utility model is as follows: a liquid supply and circulation device for a blackening tank, including a blackening tank, a main supply pipe is provided at one end of the blackening tank, a return main pipe is provided at the other end of the blackening tank, a buffer tank is provided on the return main pipe and the main supply main pipe, the bottom end of a first conveying pipe is provided above the buffer tank, a weighing tank is provided at the top end of the first conveying pipe, a support is provided on the outside of the weighing tank, and a weight sensor is provided on the support and the weighing tank. A first pressurization device is sequentially provided along the return main pipe from near to away from the blackening tank. The pump, the heat source channel of the heat exchanger, the inlet end of the cleaning branch pipe and the first regulating valve, the outlet end of the cleaning branch pipe and the weighing tank are connected, the second regulating valve, the first check valve and the first shut-off valve are arranged sequentially on the cleaning branch pipe along the direction from the return liquid main pipe to the weighing tank, the first check valve and the first shut-off valve are connected to the cleaning branch pipe and the buffer tank and the water supply main pipe is arranged sequentially along the direction from the buffer tank to the distance from the buffer tank and the second shut-off valve, the second check valve, the first liquid flow sensor, the third regulating valve and the second booster pump.
[0006] Preferably, the buffer tank is equipped with a stirring device, which includes a stirring shaft on the buffer tank, stirring blades on the stirring shaft inside the buffer tank, and a stirring motor drivenly connected to the stirring shaft. A fourth regulating valve is provided on the first conveying pipe.
[0007] Preferably, a first temperature sensor is installed on the return main pipe between the heat exchanger and the cleaning branch pipe, and a first filter, a second temperature sensor, and an online chromatograph are sequentially installed on the return main pipe between the first booster pump and the blackening tank along the direction from near the first booster pump to away from the first booster pump.
[0008] Preferably, the buffer tank is equipped with a liquid level sensor and an exhaust valve.
[0009] Preferably, the main liquid supply pipe is provided with a fifth regulating valve, a second filter and a third booster pump in sequence along the direction from the buffer tank to the blackening tank.
[0010] Preferably, a first liquid supply device is provided between the return main pipe and the blackening tank, and a second liquid supply device is provided between the supply main pipe and the blackening tank. Both the first and second liquid supply devices include a main infusion pipe, a plurality of first infusion branch pipes arranged sequentially along the extension direction of the main infusion pipe, and a plurality of second infusion branch pipes arranged sequentially along the extension direction of the corresponding first infusion branch pipe between each first infusion branch pipe and the blackening tank. The main infusion pipe and the first infusion branch pipes are perpendicular to each other.
[0011] Preferably, the central axis of the main supply pipe of the first liquid supply device is perpendicular to the central axis of the main supply pipe of the second liquid supply device.
[0012] The beneficial effects of this utility model are as follows: First, by setting up a weighing tank, it is convenient to add the weighed blackening agent stock solution to the buffer tank; by setting up a water supply main pipe and a first liquid flow sensor, it is convenient to add water as a diluent to the buffer tank; and by setting up a heat exchanger on the return liquid main pipe, it is convenient to perform countercurrent heat exchange on the liquid supplied to the heat source channel of the heat exchanger, thereby maintaining the temperature and concentration of the blackening solution in use.
[0013] Secondly, the buffer tank described in this utility model is equipped with a liquid level sensor and an exhaust valve; the installation of the liquid level sensor facilitates the feedback of liquid level parameters.
[0014] Furthermore, the main water supply pipe of this utility model is sequentially equipped with a second shut-off valve, a second check valve, a first liquid flow sensor, a third regulating valve, and a second booster pump along the direction from near the buffer tank to far away from the buffer tank; the installation of the first liquid flow sensor facilitates feedback of liquid flow parameters.
[0015] This utility model has a simple structure, is easy to operate, and has a clever design, which greatly improves work efficiency and has good social and economic benefits. It is a product that is easy to promote and use. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of this utility model.
[0017] Figure 2 This is a three-dimensional structural diagram of the blackening groove of this utility model. Detailed Implementation
[0018] like Figure 1 and Figure 2As shown, a liquid supply and circulation device for a blackening tank includes a blackening tank 1. A main supply pipe 2 is provided at one end of the blackening tank 1, and a main return pipe 3 is provided at the other end of the blackening tank 1. A buffer tank 4 is provided on the main return pipe 3 and the main supply pipe 2. The bottom end of a first conveying pipe 5 is provided above the buffer tank 4, and a weighing tank 6 is provided at the top end of the first conveying pipe 5. A support 7 is provided on the outside of the weighing tank 6, and a weight sensor 8 is provided on the support 7 and the weighing tank 6. A first booster pump 9, a heat source channel of a heat exchanger 10, and a cleaning support are sequentially arranged along the main return pipe 3 from near to away from the blackening tank 1. The inlet end of pipe 11 is connected to the first regulating valve 12, and the outlet end of cleaning branch pipe 11 is connected to the weighing tank 6. A second regulating valve 13, a first check valve 14, and a first shut-off valve 15 are sequentially arranged on the cleaning branch pipe 11 along the direction from the return main pipe 3 to the weighing tank 6. A water supply main pipe 16 is arranged on the cleaning branch pipe 11 and the buffer tank 4 between the first check valve 14 and the first shut-off valve 15. A second shut-off valve 17, a second check valve 18, a first liquid flow sensor 19, a third regulating valve 20, and a second booster pump 21 are sequentially arranged on the water supply main pipe 16 along the direction from near the buffer tank 4 to far away from the buffer tank 4.
[0019] The buffer tank 4 is equipped with a stirring device, which includes a stirring shaft 22 on the buffer tank 4, stirring blades 23 on the stirring shaft 22 inside the buffer tank 4, and a stirring motor 24 driven by the stirring shaft 22. A fourth regulating valve 25 is installed on the first delivery pipe 5 to facilitate stirring of the incoming solution. A first temperature sensor 26 is installed on the return main pipe 3 between the heat exchanger 10 and the cleaning branch pipe 11. A first filter 27, a second temperature sensor 28, and an online chromatograph 29 are sequentially installed on the return main pipe 3 between the first booster pump 9 and the blackening tank 1, from near to away from the first booster pump 9. A liquid level sensor 30 and an exhaust valve 31 are installed on the buffer tank 4. A fifth regulating valve 32, a second filter 33, and a third booster pump 34 are sequentially installed on the supply main pipe 2 from the buffer tank 4 to the blackening tank 1. A second liquid flow sensor 39 is installed on the return main pipe 3 between the first booster pump 9 and the heat exchanger 10, and on the supply main pipe 2 between the third booster pump 34 and the blackening tank 1.
[0020] A first liquid supply device is installed between the return main pipe 3 and the blackening tank 1, and a second liquid supply device is installed between the supply main pipe 2 and the blackening tank 1. Both the first and second liquid supply devices include a main infusion pipe 35, several first infusion branch pipes 36 sequentially arranged along the extension direction of the main infusion pipe 35, and several second infusion branch pipes 37 sequentially arranged along the extension direction of the corresponding first infusion branch pipe 36 between each first infusion branch pipe 36 and the blackening tank 1. The main infusion pipe 35 and the first infusion branch pipes 36 are perpendicular to each other. Each first infusion branch pipe 36 is equipped with a third shut-off valve 38, and each third shut-off valve 38 is installed between the second infusion branch pipe 37 and the main infusion pipe 35. The central axis of the supply main pipe 2 of the first liquid supply device is perpendicular to the central axis of the supply main pipe 2 of the second liquid supply device. The central axis of the main supply pipe 2 of the first liquid supply device is parallel to the ground, while the central axis of the main supply pipe 2 of the second liquid supply device is perpendicular to the ground. This facilitates the adjustment of the inflow and outflow of liquid in the blackening tank 1.
[0021] The instructions for using this product are as follows: Figure 1 and Figure 2 As shown, firstly, the tempered workpiece is placed in the working liquid of the blackening tank 1. After the tempered workpiece has been in the working liquid for a preset time, the immersion in the blackening solution is complete. During this period, the blackening tank 1 receives the working liquid supplied by the first supply device, and the working liquid in the blackening tank 1 is continuously supplied to the first supply device. The tempered workpiece and the flowing working liquid exchange heat, and during this period, some of the working liquid adheres to the tempered workpiece to form a film.
[0022] The second liquid supply device receives the working liquid from the blackening tank 1 and supplies it to the return liquid main 3. After receiving temperature parameters from the second temperature sensor 28 and concentration parameters from the online chromatograph 29, the liquid passes through the first filter 27 to filter mechanical impurities. Then, it is pressurized by the first booster pump 9 and supplied to the heat source channel of the heat exchanger 10. The heat exchanger 10 continuously receives a cold source medium for countercurrent heat exchange. During this process, the flow rate is fed back by the second liquid flow sensor 39 on the return liquid main 3. The cold source channel of the heat exchanger 10 continuously receives circulating water from the outside. The amount of circulating water supplied is determined based on the flow rate and temperature parameters fed back by the second liquid flow sensor 39 and the second temperature sensor 28 on the return liquid main 3. The working liquid after heat exchange, supplied from the outlet of the heat source channel of the heat exchanger 10, is sent to the buffer tank 4. The working liquid in the buffer tank 4 is then supplied to the liquid supply main 2, where it is filtered for mechanical impurities by the second filter 33, pressurized by the third booster pump 34, and finally returned to the blackening tank 1 via the first liquid supply device after receiving the flow rate parameters fed back by the second liquid flow sensor 39 on the liquid supply main 2, completing the circulation. During the circulation process, the liquid supply and return volume of the blackening tank 1 need to be adjusted according to the actual speed at which the workpiece is put into the blackening tank 1. The adjustment of the liquid supply and return volume of the blackening tank 1 requires opening or closing several third shut-off valves 38 in the first liquid supply device and several third shut-off valves 38 in the second liquid supply device, and adjusting the third booster pump 34 and the first booster pump 9 accordingly.
[0023] When the concentration parameters reported by the online chromatograph 29 are abnormal, including both solute and solution abnormalities, the operator calculates the required amount of solute based on the concentration parameters reported by the online chromatograph 29 and delivers it to the weighing tank 6. After receiving feedback from the weight sensor 8, the solute is delivered to the buffer tank 4 via the first delivery pipe 5. During this process, the stirring device on the buffer tank 4 needs to be activated to agitate the delivered solute and the liquid inside the buffer tank 4. The amount of solute delivered to the weighing tank 6 must exceed the preset amount. After the solute in the weighing tank 6 has been delivered, the second regulating valve 13 is opened to divert part of the pressurized working liquid from the first booster pump 9 to the weighing tank 6 to perform a first rinse of the remaining solute in the weighing tank 6. The rinsed working liquid is then delivered to the buffer tank 4 via the first delivery pipe 5 and stirred to mix the solution inside the buffer tank 4. The working liquid delivered to the weighing tank 6 via the cleaning branch pipe 11 is stopped after a preset time based on the amount of solute weighed in a single batch. Then, based on the amount of solute in weighing tank 6 and the concentration parameters fed back by the online chromatograph 29, a preset amount of water is supplied to weighing tank 6 through the main water supply pipe 16. After the water enters weighing tank 6 and completes a second rinsing of weighing tank 6, it is then transported to buffer tank 4 through the first delivery pipe 5, where the working liquid is stirred and mixed. Finally, after maintaining the circulation for a preset time, the tempered workpiece can be received again from upstream.
[0024] When an abnormality in the solution is detected based on the concentration parameters fed back by the online chromatograph 29, the second booster pump 21 needs to be turned on to supply water to the buffer tank 4 through the main water supply pipe 16. The water supply volume is determined based on the concentration parameters fed back by the online chromatograph 29 and the parameters fed back by the first liquid flow sensor 19. After the water supply is completed, it still needs to be maintained for a preset time before it can accept the tempered workpiece supplied from upstream again.
[0025] Finally, when the blackening tank 1 needs maintenance, the supply of working liquid to the blackening tank 1 through the main supply pipe 2 is stopped, and only the third shut-off valve 38 on the first supply branch pipe 36 near the bottom of the blackening tank 1 is opened. At this time, the solution in the blackening tank 1 is continuously supplied to the buffer tank 4 through the return main pipe 3 until the solution in the blackening tank 1 reaches the preset liquid level.
[0026] This embodiment achieves the following: by setting up a weighing tank 6, it is convenient to add the weighed blackening agent stock solution to the buffer tank 4; by setting up a water supply main pipe 16 and a first liquid flow sensor 19, it is convenient to add water as a diluent to the buffer tank 4; and by setting up a heat exchanger 10 on the return liquid main pipe 3, it is convenient to perform countercurrent heat exchange on the liquid supplied to the heat source channel of the heat exchanger 10, thereby maintaining the temperature and concentration of the blackening solution in use.
[0027] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.
Claims
1. A liquid supply and circulation device for a blackening tank, characterized in that: The system includes a blackening tank (1), with a main supply pipe (2) at one end and a return pipe (3) at the other end. A buffer tank (4) is installed on the return pipe (3) and the main supply pipe (2). The bottom end of a first conveying pipe (5) is installed above the buffer tank (4), and a weighing tank (6) is installed on the top end of the first conveying pipe (5). A bracket (7) is installed on the outside of the weighing tank (6), and a weight sensor (8) is installed on the bracket (7) and the weighing tank (6). The return pipe (3) is arranged along the direction from near the blackening tank (1) to away from the blackening tank (1) with a first booster pump (9), a heat source channel of a heat exchanger (10), and the inlet end of a cleaning branch pipe (11). The outlet end of the cleaning branch pipe (11) is connected to the weighing tank (6) along with the first regulating valve (12). The cleaning branch pipe (11) is provided with a second regulating valve (13), a first check valve (14) and a first shut-off valve (15) in sequence along the direction from the return main pipe (3) to the weighing tank (6). The cleaning branch pipe (11) between the first check valve (14) and the first shut-off valve (15) and the buffer tank (4) are provided with a water supply main pipe (16). The water supply main pipe (16) is provided with a second shut-off valve (17), a second check valve (18), a first liquid flow sensor (19), a third regulating valve (20) and a second booster pump (21) in sequence along the direction from near the buffer tank (4) to far away from the buffer tank (4).
2. The liquid supply and circulation device for the blackening tank according to claim 1, characterized in that: The buffer tank (4) is equipped with a stirring device, which includes a stirring shaft (22) on the buffer tank (4), stirring blades (23) on the stirring shaft (22) inside the buffer tank (4), and a stirring motor (24) connected to the stirring shaft (22). A fourth regulating valve (25) is provided on the first conveying pipe (5).
3. The liquid supply and circulation device for the blackening tank according to claim 1, characterized in that: A first temperature sensor (26) is installed on the return main pipe (3) between the heat exchanger (10) and the cleaning branch pipe (11). A first filter (27), a second temperature sensor (28) and an online chromatograph (29) are sequentially installed on the return main pipe (3) between the first booster pump (9) and the blackening tank (1) along the direction from near the first booster pump (9) to away from the first booster pump (9).
4. The liquid supply and circulation device for the blackening tank according to claim 1, characterized in that: The buffer tank (4) is equipped with a liquid level sensor (30) and an exhaust valve (31).
5. The liquid supply and circulation device for the blackening tank according to claim 1, characterized in that: The main supply pipe (2) is provided with a fifth regulating valve (32), a second filter (33) and a third booster pump (34) in sequence along the direction from the buffer tank (4) to the blackening tank (1).
6. The liquid supply and circulation device for the blackening tank according to claim 1, characterized in that: A first liquid supply device is provided between the return main pipe (3) and the blackening tank (1), and a second liquid supply device is provided between the supply main pipe (2) and the blackening tank (1). The first liquid supply device and the second liquid supply device both include a main infusion pipe (35), a plurality of first infusion branch pipes (36) arranged sequentially along the extension direction of the main infusion pipe (35) on the main infusion pipe (35), and a plurality of second infusion branch pipes (37) arranged sequentially along the extension direction of the corresponding first infusion branch pipe (36) between each first infusion branch pipe (36) and the blackening tank (1). The main infusion pipe (35) and the first infusion branch pipes (36) are perpendicular to each other.
7. The liquid supply and circulation device for the blackening tank according to claim 6, characterized in that: The central axis of the main supply pipe (2) of the first liquid supply device is perpendicular to the central axis of the main supply pipe (2) of the second liquid supply device.