A device for controlling the duration of a hanging galvanized alloy process and its control method

Abstract

The present invention discloses a device and its control method capable of automatically controlling the duration of the brightening process and the passivation process in the hanging zinc alloy plating, including several room temperature sensors for detecting the room temperature, a brightening tank, a passivation tank, a transfer device, and a control cabinet with a built-in control module. The control module calculates the duration for the grasping end of the transfer device to immerse in the liquid in the brightening tank or the passivation tank according to a specific formula and controls its immersion.

Description

Technical Field

[0001] The present invention relates to a rack plating process, and particularly to a device for controlling the duration of the process of rack plating zinc alloy and a control method thereof. Background Art

[0002] Electroplating is mainly divided into rack plating, barrel plating, brush plating and continuous plating according to the plating method. Rack plating, also known as "hanging plating", as the name implies, is to use a fixture to hang products for electroplating. Rack plating is particularly suitable for electroplating parts with high precision requirements, such as watch cases, jewelry, hardware precision parts and other products.

[0003] In the process of rack plating zinc alloys such as zinc, zinc-iron, zinc-nickel, zinc-cobalt, etc., bright dipping and passivation are two relatively important processes. Both the bright dipping process and the passivation process are carried out by immersing the suspended products in the corresponding reaction solutions. The bright dipping reaction solution contains 0.3% concentration of nitric acid (nitric acid can also be replaced by hydrochloric acid or citric acid). The main function of the bright dipping process is to remove by-products such as the oxide layer, residual chemical reactants, organic residues, etc. generated on the surface of the product during the electroplating process, so as to facilitate the firm deposition of the passivation film; the main function of passivation is to carry out a displacement reaction on the electroplated layer after being treated by the bright dipping process with a trivalent chromium passivation solution to form a passivation film to improve the corrosion resistance of the product.

[0004] The existing processes have the following problems: The existing processes mainly focus on and improve the reaction effect when the product is immersed in the reaction solution, while ignoring that when the product is lifted out of the reaction tank, the reaction solution attached to the surface of the product will still chemically react with the product, which will lead to two aspects of uncontrollability: 1. After the product is lifted out of the reaction tank, due to the temperature difference between the room temperature and the reaction solution, the ambient temperature of the reaction solution and the product changes, causing side reactions on the outer surface of the product, which may generate more by-products and affect the quality of the product; 2. The room temperature changes every hour, so that products in different time periods will obtain different by-products after being lifted out, and the quality of products in the same batch is unstable, and the scrap rate is relatively high. Summary of the Invention

[0005] Object of the Invention: The object of the present invention is to provide a device for automatically controlling the duration of the bright dipping process and the passivation process in rack plating zinc alloy and a control method thereof.

[0006] Technical Solution: A device for controlling the duration of the process of rack plating zinc alloy according to the present invention includes a plurality of room temperature sensors for detecting the room temperature, a bright dipping tank with a built-in bright dipping reaction solution, a transfer device for hanging and transporting products, and a control cabinet with a built-in control module. A bright dipping liquid temperature sensor is fixedly arranged in the bright dipping tank. The room temperature sensors and the bright dipping liquid temperature sensors are respectively connected to the control module through data lines. The control module is connected to the transfer device through a control line. The steps for the control module to control the duration of the grasping end of the transfer device immersed in the bright dipping reaction solution are as follows:

[0007] Step 1: Calculate according to the following formula:

[0008] , where A is the average room temperature, B is the temperature of the light-emitting reaction solution detected by the light-emitting liquid temperature sensor, and T 1 is the standard reaction time of the light-emitting process;

[0009] Step 2: Round the value obtained in Step 1 to the nearest integer without retaining decimal places. Rounding the value obtained in Step 1 to the nearest integer without retaining decimal places is because the control of the transfer device only supports precision to the nearest integer without retaining decimal places.

[0010] Furthermore, it also includes a passivation tank with built-in passivation reaction solution. A passivation liquid temperature sensor is fixedly installed in the passivation tank, and the passivation liquid temperature sensor is connected to the control module through a data cable. The steps for the control module to control the duration of the grasping end of the transfer device immersed in the passivation reaction solution are as follows:

[0011] Step α: Calculate according to the following formula:

[0012] , where A is the average room temperature, C is the temperature of the passivation reaction solution detected by the passivation liquid temperature sensor, and T 2 is the standard reaction time of the passivation process;

[0013] Step β: Round the value obtained in Step α to the nearest integer without retaining decimal places. Rounding the value obtained in Step 1 to the nearest integer without retaining decimal places is because the control of the transfer device only supports precision to the nearest integer without retaining decimal places.

[0014] Furthermore, the range of B is 24°C to 26°C.

[0015] Furthermore, the range of C is 38°C to 42°C.

[0016] Furthermore, a number of stirrers are fixedly installed in the light-emitting tank and the passivation tank respectively. The stirrers are used to stir the light-emitting reaction solution and the passivation reaction solution to make there be no temperature difference inside.

[0017] Furthermore, the transfer device is a traveling crane or a robot.

[0018] A control method for controlling the duration of the light-emitting process, the steps are as follows:

[0019] Step 1: Calculate according to the following formula:

[0020] , where A is the average room temperature, B is the temperature of the light-emitting reaction solution detected by the light-emitting liquid temperature sensor, and T 1The standard reaction time of the light emitting process, the range of B is 24℃~26℃;

[0021] In the second step, the value obtained in the first step is rounded to no decimal point. The control of the transfer device only supports accuracy without decimal point.

[0022] A method for controlling the duration of a passivation process, the steps of which are as follows:

[0023] Step α: Calculate according to the following formula:

[0024] , where A is the average room temperature, C is the temperature of the passivation reaction liquid detected by the passivation liquid temperature sensor, T 2 The standard reaction time of the light emitting process, the range of C is 38℃~42℃;

[0025] In step β, the value obtained in step α is rounded to no decimal point. The value obtained in step 1 is rounded to no decimal point because the control of the transfer device only supports accuracy without decimal point.

[0026] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: The present invention takes into account the side reactions between the product and the reaction liquid on its surface at room temperature, shortens or prolongs the reaction time of the product in the light-emitting pool and the passivation pool through formula calculation, eliminates the influence of side reactions on the product at room temperature as much as possible, and improves product quality and the stability of product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional diagram of the first embodiment of the present invention.

[0028] Figure 2 It is a three-dimensional diagram of the second embodiment of the present invention.

[0029] Figure 3 It is a schematic diagram of the structure in the light output pool of the present invention.

[0030] Figure 4 It is a schematic diagram of the structure in the passivation tank of the present invention.

[0031] Among them: 1. Room temperature sensor; 2. Driving; 3. Light output pool; 301. Light output liquid temperature sensor; 4. Passivation pool; 401. Passivation liquid temperature sensor; 5. Control cabinet; 501. Control module; 6. Robot; 7. Agitator. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0033] Example 1

[0034] See the appendix Figure 1 、 Figure 3 and Figure 4 For a device for controlling the process duration of hanging galvanized alloy shown in the present invention, it includes six room temperature sensors 1 for detecting room temperature, a traveling crane 2 for hanging and transporting products, a pickling bath 3 with pickling reaction liquid inside, a passivation bath 4 with passivation reaction liquid inside, and a control cabinet 5 with a built-in control module 501. A pickling liquid temperature sensor 301 and several stirrers 7 are fixedly arranged in the pickling bath 3. The stirrers 7 are used to stir the pickling reaction liquid in the pickling bath 3 so that there is no temperature difference inside. A passivation liquid temperature sensor 401 and several stirrers 7 are fixedly arranged in the passivation bath 4. The stirrers 7 are used to stir the passivation reaction liquid so that there is no temperature difference inside. The room temperature sensors 1, the pickling liquid temperature sensor 301, and the passivation liquid temperature sensor 401 are respectively connected to the control module 501 through data lines, and the control module 501 is connected to the traveling crane 2 through a control line.

[0035] At this time: The average room temperature A detected by the six room temperature sensors 1 is 27.3 °C, the temperature B detected by the pickling liquid temperature sensor 301 is 25 °C, and the temperature C detected by the passivation liquid temperature sensor 401 is 40 °C. The standard reaction time T 1 for the pickling process is 20 seconds, and the standard reaction time T 2 for the passivation process is 25 seconds;

[0036] The time for the control module 501 to control the grasping end of the traveling crane 2 to immerse into the liquid in the pickling bath 3 is:

[0037] , and after rounding, it is taken as 18 seconds;

[0038] The time for the control module 501 to control the grasping end of the traveling crane 2 to immerse into the liquid in the passivation bath 4 is:

[0039] , and after rounding, it is taken as 33 seconds.

[0040] Example 2

[0041] See the appendix Figures 2 to 4, a device for controlling the process duration of hanging galvanized alloy shown in the present invention, a device for controlling the process duration of hanging galvanized alloy shown in the present invention, includes six room temperature sensors 1 for detecting room temperature, a robot 6 for hanging and transporting products, a pickling tank 3 with pickling reaction liquid inside, a passivation tank 4 with passivation reaction liquid inside, and a control cabinet 5 with a control module 501 inside. A pickling liquid temperature sensor 301 and several stirrers 7 are fixedly arranged in the pickling tank 3. The stirrers 7 are used to stir the reaction liquid so that there is no temperature difference inside. A passivation liquid temperature sensor 401 and several stirrers 7 are fixedly arranged in the passivation tank 4. The stirrers 7 are used to stir the passivation reaction liquid so that there is no temperature difference inside. The room temperature sensors 1, the pickling liquid temperature sensor 301, and the passivation liquid temperature sensor 401 are respectively connected to the control module 501 through data lines. The control module 501 is connected to the robot 6 through a control line.

[0042] At this time: The average room temperature A detected by the six room temperature sensors 1 is 10°C, the temperature B detected by the pickling liquid temperature sensor 301 is 26°C, the temperature C detected by the passivation liquid temperature sensor 401 is 41°C, and the standard reaction time T of the pickling process 1 is 20 seconds, and the standard reaction time T of the passivation process 2 is 25 seconds;

[0043] The duration for the control module 501 to control the grasping end of the robot 6 to immerse into the liquid in the pickling tank 3 is:

[0044] , and after rounding, it is taken as 32 seconds;

[0045] The duration for the control module 501 to control the grasping end of the hoist 2 to immerse into the liquid in the passivation tank 4 is:

[0046] , and after rounding, it is taken as 44 seconds.

Claims

1. A device for controlling the duration of the hanging galvanized alloy process, characterized in that: It includes several room temperature sensors (1) for detecting room temperature, a light-emitting pool (3) with a light-emitting reaction solution inside, a transfer device for hanging and transporting products, and a control cabinet with a built-in control module (501). A light-emitting solution temperature sensor (301) is fixedly arranged inside the light-emitting pool (3). The room temperature sensor (1) and the light-emitting solution temperature sensor (301) are respectively connected to the control module (501) through data lines. The control module (501) is connected to the transfer device through a control line. The steps for the control module (501) to control the duration of the grasping end of the transfer device immersed in the light-emitting reaction solution are as follows: The first step: Calculate according to the following formula: Where A is the average room temperature, B is the temperature of the light-emitting reaction liquid detected by the light-emitting liquid temperature sensor (301), the range of B is 24°C to 26°C, and T 1 is the standard reaction time for the light-emitting process; The second step: Round the value obtained in the first step to not retain the decimal point.

2. The device for controlling the duration of the hanging galvanized alloy process according to claim 1, characterized in that: It further includes a passivation pool (4) with a passivation reaction solution inside. A passivation solution temperature sensor (401) is fixedly arranged inside the passivation pool (4). The passivation solution temperature sensor (401) is connected to the control module (501) through a data line. The steps for the control module (501) to control the duration of the grasping end of the transfer device immersed in the passivation reaction solution are as follows: The α step: Calculate according to the following formula: Where A is the average room temperature, C is the temperature of the passivation reaction solution detected by the passivation solution temperature sensor (401), the range of C is 38°C to 42°C, and T 2 is the standard reaction time of the passivation process; The β step: Round the value obtained in the α step to not retain the decimal point.

3. The device for controlling the duration of the hanging galvanized alloy process according to claim 1, characterized in that: Several stirrers (7) are respectively fixedly arranged inside the light-emitting pool (3) and the passivation pool (4). The stirrers (7) are used to stir the light-emitting reaction solution and the passivation reaction solution so that there is no temperature difference inside.

4. The device for controlling the duration of the hanging galvanized alloy process according to claim 1, characterized in that: The transfer device is a traveling crane (2) or a robot (6).

5. A control method for controlling the duration of the light-emitting process, the steps are as follows: The first step: Calculate according to the following formula: Where A is the average room temperature, B is the temperature of the light-emitting reaction solution detected by the light-emitting solution temperature sensor (301), and T 1 is the standard reaction time for the light-emitting process, and the range of B is 24°C to 26°C; The second step: Round the value obtained in the first step to not retain the decimal point.

6. A control method for controlling the duration of the passivation process, the steps are as follows: The α step: Calculate according to the following formula: where A is the average room temperature, C is the temperature of the passivation reaction solution detected by the passivation solution temperature sensor (401), and T 2 is the standard reaction time of the passivation process, and the range of C is 38°C to 42°C; The β step: Round the value obtained in the α step to not retain the decimal point.

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