Spraying process for blackening annular workpieces

Abstract

The application discloses a blackening spraying process for a ring-shaped workpiece, and comprises the following steps: spraying a degreasing agent on the inner and outer surfaces of the rotating ring-shaped workpiece to perform degreasing treatment, and then spraying pure water on the inner and outer surfaces to perform degreasing rinsing; spraying a first blackening concentration liquid on the inner and outer surfaces of the rotating ring-shaped workpiece, and then spraying pure water on the inner and outer surfaces to perform first rinsing after the first blackening is completed; spraying a second blackening concentration liquid on the inner and outer surfaces of the rotating ring-shaped workpiece after the first rinsing, and then spraying pure water on the inner and outer surfaces to perform second rinsing after the second blackening is completed; conveying the ring-shaped workpiece after the second rinsing to a hot water tank to perform hot water washing; conveying the ring-shaped workpiece after the hot water washing to an oil immersion spraying area, and spraying antirust oil on the inner and outer surfaces of the rotating ring-shaped workpiece. The blackening process is realized by means of spraying and rotating, the film layer is uniform, the product quality is greatly improved, and the heating power is small, so that the energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of blackening production line, in particular to a spraying process for blackening annular workpieces. BACKGROUND

[0002] With the increasing update of products, the size of annular workpieces is also getting larger and larger. For example, with the rapid development of the wind power industry, the single-machine capacity of wind turbines is required to be improved, and the size of bearings matched with the wind turbines is also gradually getting larger. The current traditional blackening production line for annular workpieces adopts immersion type, which has high heating power and uneven blackening layer, and it is difficult to reach the international highest standard in the same industry. The current large-circle blackening production line is semi-immersion type, which also has high heating power and uneven blackening layer, and cannot meet the requirements of the new industry standards in appearance, softness detection and microstructure. Other blackening methods may have the phenomenon of blackening dead angle. SUMMARY

[0003] The purpose of the present application is to provide a spraying process for blackening annular workpieces, which changes the original immersion type and semi-immersion type to spraying and rotating type, greatly improves the product quality, reduces energy consumption, and does not have the phenomenon of blackening dead angle.

[0004] To achieve the above purpose, the technical solution provided by the present application is as follows: a spraying process for blackening annular workpieces, comprising:

[0005] transporting the annular workpiece to a degreasing spraying area, spraying a degreasing agent on the inner and outer surfaces of the rotating annular workpiece for degreasing treatment, and then spraying pure water on the inner and outer surfaces for degreasing rinsing after the degreasing is completed;

[0006] transporting the annular workpiece after the degreasing rinsing to a blackening spraying area, spraying a first blackening concentration liquid on the inner and outer surfaces of the rotating annular workpiece, spraying pure water on the inner and outer surfaces for first rinsing after the first blackening is completed, spraying a second blackening concentration liquid on the inner and outer surfaces of the rotating annular workpiece after the first rinsing, and spraying pure water on the inner and outer surfaces for second rinsing after the second blackening is completed;

[0007] transporting the annular workpiece after the second rinsing to a hot water tank for hot water washing to remove the residual blackening liquid and waste residue on the surface;

[0008] transporting the annular workpiece after the hot water washing to an oil spraying area, and spraying anti-rust oil on the inner and outer surfaces of the rotating annular workpiece.

[0009] Furthermore, rotating fixtures are provided in the degreasing spray area, blackening spray area, and oil immersion spray area. The rotating fixtures include a tank body and a tank cover. A rotary motor is provided at the bottom of the tank body. The shaft end of the rotary motor extends into the tank body and is connected to a rotary flange. A support fixture for supporting the ring-shaped workpiece is placed on the rotary flange. A support column is provided at the bottom of the tank cover. The tank cover is connected to a pneumatic cylinder on the outer wall of the tank body through an air pipe. The tank body is located in a water receiving basin, which is connected to a drainage trough. An inductive switch connected to a controller is provided on the inner wall of the tank body.

[0010] Furthermore, degreasing spray pipes and water washing spray pipes are alternately installed on the outer wall of the support column and the inner wall of the tank of the rotating fixture in the degreasing spray area. The working area of ​​the degreasing spray pipes and water washing spray pipes is equipped with nozzles. The degreasing spray pipes are respectively connected to the first oil removal tower and the second oil removal tower containing the degreasing agent. The water washing spray pipes are connected to the degreasing water tank. Heating pipes connected to the controller are installed in the first oil removal tower, the second oil removal tower and the degreasing water tank.

[0011] Furthermore, the upper part of the degreasing spray pipe is connected to the first inlet pipe and the second inlet pipe respectively through a three-way regulating valve, and the lower part of the degreasing spray pipe is connected to the first outlet pipe and the second outlet pipe respectively through another three-way regulating valve. The first inlet pipe and the first outlet pipe are connected to the first oil removal tower, and the second inlet pipe and the second outlet pipe are connected to the second oil removal tower. The water washing spray pipe is connected to the degreasing water tank respectively through a water inlet pipe and a water outlet pipe. The water outlet pipe is equipped with a solenoid valve a, and the first inlet pipe, the second inlet pipe, and the water inlet pipe are equipped with a self-priming pump a. The self-priming pump a, the two three-way regulating valves, and the solenoid valve a are all connected to a controller. The controller is also connected to the level gauges in the first oil removal tower, the second oil removal tower, and the degreasing water tank.

[0012] Furthermore, the first degreasing tower first supplies degreasing agent to the degreasing spray pipe for spraying. The degreasing agent that falls from the annular workpiece flows back to the second degreasing tower. After reaching the liquid level threshold, the second degreasing tower starts heating. When all the degreasing agent in the first degreasing tower has flowed back to the second degreasing tower, the second degreasing tower then supplies degreasing agent to the degreasing spray pipe for spraying. The degreasing agent that falls from the annular workpiece flows back to the first degreasing tower. After reaching the liquid level threshold, the first degreasing tower starts heating. When all the degreasing agent in the second degreasing tower has flowed back to the first degreasing tower, the above steps are repeated.

[0013] Furthermore, multiple sets of spray pipes are evenly distributed on the outer wall of the support column and the inner wall of the tank of the rotating fixture in the blackening spraying area. Each set of spray pipes includes a first blackening spray pipe, a second blackening spray pipe, a first water washing spray pipe, and a second water washing spray pipe arranged in sequence. The working areas of the first blackening spray pipe, the second blackening spray pipe, the first water washing spray pipe, and the second water washing spray pipe are all equipped with nozzles. The first blackening spray pipe is connected to three first blackening towers containing liquid with a primary blackening concentration. The second blackening spray pipe is connected to three second blackening towers containing liquid with a secondary blackening concentration. The first water washing spray pipe is connected to the first water washing tank. The second water washing spray pipe is connected to the second water washing tank. Each first blackening tower and each second blackening tower is equipped with a heating pipe connected to the controller.

[0014] Furthermore, the upper part of the first blackening spray pipe is connected to three inlet pipes a via four-way regulating valves, and the lower part of the first blackening spray pipe is connected to three outlet pipes a via four-way regulating valves. Inlet pipes a and outlet pipes a in the same group are connected to the corresponding first blackening tower. The upper part of the second blackening spray pipe is connected to three inlet pipes b via four-way regulating valves, and the lower part of the second blackening spray pipe is connected to three outlet pipes b via four-way regulating valves. Inlet pipes b and outlet pipes b in the same group are connected to the corresponding second blackening tower. The first water washing... The spray pipes are connected to the first water washing tank through the first water inlet pipe and the first water outlet pipe, respectively. The second water washing spray pipes are connected to the second water washing tank through the second water inlet pipe and the second water outlet pipe, respectively. Solenoid valves b are installed on the first water inlet pipe and the second water inlet pipe. Self-priming pumps b are installed on the liquid inlet pipes a, b, the first water inlet pipe, and the second water inlet pipe. The self-priming pumps b, the four four-way regulating valves, and the solenoid valves b are all connected to the controller. The controller is also connected to the level gauges in the first blackening tower, the second blackening tower, the first water washing tank, and the second water washing tank.

[0015] Furthermore, the three primary blackening towers are designated as Primary Blackening Tower A, Primary Blackening Tower B, and Primary Blackening Tower C. Primary Blackening Towers A and B contain a primary blackening concentration liquid. Primary Blackening Tower A first supplies liquid to the primary blackening spray pipe for spraying. The primary blackening concentration liquid falling from the annular workpiece flows back to Primary Blackening Tower C. Once the liquid level reaches the threshold, Primary Blackening Tower C begins heating. After all the liquid in Primary Blackening Tower A has flowed back to Primary Blackening Tower C, Primary Blackening Tower B then supplies liquid to the primary blackening spray pipe for spraying. The primary blackening concentration liquid that falls from the annular workpiece flows back to the first blackening tower A. After reaching the liquid level threshold, the first blackening tower A starts heating. When all the liquid in the first blackening tower B flows back to the first blackening tower A, the first blackening tower C has reached the working temperature and supplies liquid to the first blackening spray pipe for spraying. The primary blackening concentration liquid that falls from the annular workpiece flows back to the first blackening tower B. After reaching the liquid level threshold, the first blackening tower B starts heating. When all the liquid in the first blackening tower B flows back to the first blackening tower C, the above steps are repeated.

[0016] The three second-stage black towers operate in the same way as the three first-stage black towers.

[0017] Furthermore, the hot water tank is equipped with a heating water pipe and a thermocouple connected to the controller, so that the water on the surface of the heated annular workpiece evaporates instantly when it is removed from the hot water tank.

[0018] Furthermore, the outer wall of the support column of the rotating fixture in the oil spraying area and the inner wall of the tank are equipped with oil spray pipes, and the working area of ​​the oil spray pipes is equipped with nozzles; the oil spray pipes are connected to the rust-preventive tower containing the rust-preventive oil through the oil inlet pipe and the oil outlet pipe respectively, and a level gauge is installed in the rust-preventive tower. A circulation pump and a solenoid valve c are installed on the oil inlet pipe, and the level gauge, circulation pump, and solenoid valve c are all connected to the controller.

[0019] Furthermore, the nozzle includes alternating conical nozzles and fan-shaped nozzles.

[0020] As a further step, the bottom of the trough is provided with a groove for accommodating a rotary motor, and a shield is provided on the groove. The shaft end of the rotary motor passes through the shield and is connected to the rotary flange.

[0021] The advantages of the above technical solution adopted in this invention are as follows: This invention achieves the blackening process through a spray rotation method, resulting in a uniform film layer, which greatly improves product quality; the heating power is low, reducing energy consumption and saving oil and degreasing agent; the first and second blackening towers are each equipped with three towers to ensure that the temperature of the blackening liquid sprayed on the workpiece is approximately the same, with a temperature difference of less than ±1 degree Celsius, and there is no waste residue on the inner and outer surfaces; complex annular workpieces can be sprayed 360° without dead angles, while reducing the amount of blackening liquid used. Attached Figure Description

[0022] Figure 1 Flowchart of the blackening spray process for ring-shaped workpieces;

[0023] Figure 2 This is a schematic diagram of the degreasing spray zone structure.

[0024] Figure 3 for Figure 2 AA section view;

[0025] Figure 4 This is a schematic diagram of the blackening spray zone structure.

[0026] Figure 5 for Figure 4 BB section view;

[0027] Figure 6 This is a schematic diagram of the hot water tank structure;

[0028] Figure 7This is a schematic diagram of the structure of the oil immersion spray zone;

[0029] Figure 8 for Figure 7 CC section view;

[0030] Figure 9 Schematic diagram of conical nozzle and fan nozzle spraying;

[0031] Figure 10 Comparison images of the workpiece's limiting component before and after;

[0032] The components include: 1. Level gauge; 2. Heating tube; 3. Three-way regulating valve; 4. Fan-shaped nozzle; 5. Conical nozzle; 6. Pneumatic cylinder; 7. Rotary flange; 8. Rotary motor; 9. Self-priming pump a; 10. Ring-shaped workpiece; 11. Support fixture; 12. Water receiving basin; 13. Drainage trough; 14. Heating water pipe; 15. Thermocouple. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application; that is, the described embodiments are only a part of the embodiments of this application, and not all of them. The components of the embodiments of this application described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0034] Example 1

[0035] like Figure 1 As shown, this embodiment provides a blackening spraying process for annular workpieces, specifically including:

[0036] The gantry crane places the annular workpiece to be processed onto a support fixture, the top of which is equipped with a limiting angle plate, such as... Figure 10 As shown, before the improvement, a concave limiting plate was used to contact the inner and outer walls of the workpiece; after the improvement, a limiting angle plate was used to contact only the outer wall of the workpiece, thus reducing the number of contact points.

[0037] like Figures 2-3 As shown, the overhead crane transports the ring-shaped workpiece and supporting fixture to the rotating fixture in the degreasing spray area, sprays degreasing agent on the inner and outer surfaces of the rotating ring-shaped workpiece for degreasing treatment, and sprays pure water on the inner and outer surfaces for degreasing rinsing after degreasing.

[0038] like Figures 4-5As shown, the overhead crane transports the annular workpiece and supporting fixture to the rotating fixture in the blackening spray area. The rotating annular workpiece is sprayed with a blackening concentration liquid once. After the first blackening is completed, pure water is sprayed onto the inner and outer surfaces for a first rinse. After the first rinse, the rotating annular workpiece is sprayed with a second blackening concentration liquid once. After the second blackening is completed, pure water is sprayed onto the inner and outer surfaces for a second rinse.

[0039] like Figure 6 As shown, the overhead crane transports the ring-shaped workpiece and supporting fixture to the hot water tank to remove residual blackening liquid and waste residue from the surface; at the same time, it heats the ring-shaped workpiece, and the water on the surface of the heated ring-shaped workpiece evaporates instantly when it is removed from the hot water tank.

[0040] like Figures 7-8 As shown, the overhead crane transports the annular workpiece and supporting fixture to the rotating fixture in the oil immersion spraying area, and sprays rust-preventive oil on the inner and outer surfaces of the rotating annular workpiece.

[0041] Finally, the overhead crane transports the ring-shaped workpiece and supporting fixtures to the unloading position to await unloading. Unloading is then done by the gantry crane transferring the workpiece to the packaging area for packaging.

[0042] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A blackening spray process for ring-shaped workpieces, characterized in that, include: The ring-shaped workpiece is transported to the degreasing spray area, where degreasing agent is sprayed onto the inner and outer surfaces of the rotating ring-shaped workpiece for degreasing treatment. After degreasing, pure water is sprayed onto the inner and outer surfaces for degreasing rinsing. After degreasing and rinsing, the ring-shaped workpiece is transported to the blackening spray area. The inner and outer surfaces of the rotating ring-shaped workpiece are sprayed with a blackening concentration liquid once. After the first blackening is completed, pure water is sprayed onto the inner and outer surfaces for a first rinse. After the first rinse, the inner and outer surfaces of the rotating ring-shaped workpiece are sprayed with a second blackening concentration liquid. After the second blackening is completed, pure water is sprayed onto the inner and outer surfaces for a second rinse. After the second rinsing, the ring-shaped workpiece is transported to a hot water tank for hot water washing to remove residual blackening liquid and waste residue from the surface. After being washed with hot water, the ring-shaped workpiece is transported to the oil spraying area, where rust-preventive oil is sprayed onto the inner and outer surfaces of the rotating ring-shaped workpiece. Rotary fixtures are provided in the degreasing spray area, blackening spray area, and oil immersion spray area. The rotary fixtures include a tank body and a tank cover. A rotary motor is provided at the bottom of the tank body. The shaft end of the rotary motor extends into the tank body and is connected to a rotary flange. A support fixture for supporting the ring-shaped workpiece is placed on the rotary flange. A support column is provided at the bottom of the tank cover. The tank cover is connected to a pneumatic cylinder on the outer wall of the tank body through an air pipe. The tank body is located in a water receiving basin, which is connected to a drainage trough. The outer wall of the support column and the inner wall of the tank of the rotating fixture in the degreasing spray area are alternately equipped with degreasing spray pipes and water washing spray pipes. The working area of ​​the degreasing spray pipes and water washing spray pipes are equipped with nozzles. The degreasing spray pipes are respectively connected to the first oil removal tower and the second oil removal tower containing the degreasing agent. The water washing spray pipes are connected to the degreasing water tank. The first oil removal tower, the second oil removal tower and the degreasing water tank are all equipped with heating pipes connected to the controller. Multiple sets of spray pipes are evenly distributed on the outer wall of the support column and the inner wall of the tank of the rotating fixture in the blackening spray area. Each set of spray pipes includes a first blackening spray pipe, a second blackening spray pipe, a first water washing spray pipe, and a second water washing spray pipe arranged in sequence. The working areas of the first blackening spray pipe, the second blackening spray pipe, the first water washing spray pipe, and the second water washing spray pipe are all equipped with nozzles. The first blackening spray pipe is connected to three first blackening towers that hold liquid with a primary blackening concentration. The second blackening spray pipe is connected to three second blackening towers that hold liquid with a secondary blackening concentration. The first water washing spray pipe is connected to the first water washing tank. The second water washing spray pipe is connected to the second water washing tank. Each first blackening tower and each second blackening tower is equipped with a heating pipe connected to the controller. The rotating fixture in the oil spraying area has oil spray pipes installed on the outer wall of the support column and the inner wall of the tank. The working area of ​​the oil spray pipes is equipped with nozzles. The oil spray pipes are connected to the rust-preventive tower containing rust-preventive oil through oil inlet pipes and oil outlet pipes. A level gauge is installed in the rust-preventive tower. A circulation pump and a solenoid valve c are installed on the oil inlet pipe. The level gauge, circulation pump, and solenoid valve c are all connected to a controller. The bottom of the tank has a groove for accommodating a rotating motor. A shield is installed on the groove. The shaft end of the rotating motor passes through the shield and is connected to a rotating flange.

2. The blackening spraying process for annular workpieces according to claim 1, characterized in that, The first degreasing tower first supplies degreasing agent to the degreasing spray pipe for spraying. The degreasing agent that falls from the annular workpiece flows back to the second degreasing tower. After reaching the liquid level threshold, the second degreasing tower starts heating. When all the degreasing agent in the first degreasing tower has flowed back to the second degreasing tower, the second degreasing tower supplies degreasing agent to the degreasing spray pipe for spraying. The degreasing agent that falls from the annular workpiece flows back to the first degreasing tower. After reaching the liquid level threshold, the first degreasing tower starts heating. When all the degreasing agent in the second degreasing tower has flowed back to the first degreasing tower, the above steps are repeated.

3. The blackening spraying process for annular workpieces according to claim 1, characterized in that, The three primary blackening towers are designated as Primary Blackening Tower A, Primary Blackening Tower B, and Primary Blackening Tower C. Primary Blackening Towers A and B contain a primary blackening concentration liquid. Primary Blackening Tower A first supplies liquid to the primary blackening spray pipe for spraying. Liquid falling from the annular workpiece flows back to Primary Blackening Tower C. Once the liquid level reaches a threshold, Primary Blackening Tower C begins heating. After all the liquid in Primary Blackening Tower A has flowed back to Primary Blackening Tower C, Primary Blackening Tower B then supplies liquid to the primary blackening spray pipe for spraying. The primary blackening concentration liquid that falls from the annular workpiece flows back to the first blackening tower A. After reaching the liquid level threshold, the first blackening tower A starts heating. When all the liquid in the first blackening tower B flows back to the first blackening tower A, the first blackening tower C has reached the working temperature and supplies liquid to the first blackening spray pipe for spraying. The primary blackening concentration liquid that falls from the annular workpiece flows back to the first blackening tower B. After reaching the liquid level threshold, the first blackening tower B starts heating. When all the liquid in the first blackening tower B flows back to the first blackening tower C, the above steps are repeated. The three second-stage black towers operate in the same way as the three first-stage black towers.

4. The blackening spraying process for annular workpieces according to claim 1, characterized in that, The hot water tank is equipped with a heating water pipe and a thermocouple connected to the controller. The water on the surface of the annular workpiece evaporates instantly when it is removed from the hot water tank after being heated.

5. The blackening spraying process for annular workpieces according to claim 1, characterized in that, The nozzles include alternating conical nozzles and fan-shaped nozzles.

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