KR100725526B1 - Appareatus for mearsuring specific gravity and system for controlling specific gravity of flux employing thereof - Google Patents

Abstract

The present invention relates to a specific gravity measuring device for measuring the specific gravity of a fluid and an apparatus for managing the specific gravity of a flux such that the concentration of the flux is always constant by using the specific gravity measuring device.

In the specific gravity measurement apparatus according to the present invention, the supply pipe 15 is connected to the inner container 11 of the double container 10, and the discharge pipe 17 is connected to the outer container 13 of the double container 10, and inside The hydrometer 19 is disposed in the container 11, and the temperature sensor 35 is disposed in the outer container 13 of the double container 10, so that the temperature sensor 35 is supplied to the double container 10. Detecting the temperature of the solution, the photo coupler 27 is mounted on the elevating member 25 which is moved up and down along the rotary shaft 23 of the stepping motor 21, and the zero point is set on the upper end of the rotary shaft 23 The sensor 31 detects the marker 33 of the elevating member 25, detects the zero point of the elevating member 25, and the photo coupler 27 performs a hydrometer while the elevating member 25 is descending. By measuring the floating height of 19 and transmitting a signal to the central processing unit 29, the central processing unit 29 measured the solution at the temperature measured by the temperature sensor 35. The temperature can be compensated for the specific gravity value measured in relation to the specific gravity as compared to the standard specific gravity at the reference temperature, and the display unit 37 displays the measured specific gravity, the measured temperature, the temperature compensation specific gravity (the ready specific gravity), the specific gravity upper limit value, and the specific gravity lower limit value. It can be displayed.

Description

Gravity measurement device and flux gravity management device using the same {Appareatus for mearsuring specific gravity and system for controlling specific gravity of flux employing

1 is a schematic view showing a specific gravity measuring apparatus according to a first embodiment of the present invention

FIG. 2 is a block diagram illustrating a flux weight management apparatus to which the specific gravity measuring apparatus of FIG. 1 is applied.

Figure 3 is a schematic diagram showing a specific gravity measuring device according to a second embodiment of the present invention

Figure 4 is a schematic diagram showing a specific gravity measuring device according to a third embodiment of the present invention

5 is a schematic view showing a specific gravity measuring apparatus according to a third embodiment of the present invention

The present invention relates to a specific gravity measuring device for measuring the specific gravity of a fluid and an apparatus for managing the specific gravity of a flux such that the concentration of the flux is always constant by using the specific gravity measuring device.

In general, good flux coating is important for producing high quality printed circuit boards. Therefore, in the case of the automatic soldering apparatus, a method must be sought to keep the concentration of the flux stored in the flux tank at all times constant.

As one of such methods, Korean Patent Application No. 2003-26060 (filed April 24, 2003) has proposed a device and method for compensating the specific gravity measurement of a fluid fluid using a strain gauge.

The specific gravity measurement compensator for the flow fluid using the strain gauge is a main tank for supplying the target solution for measuring the specific gravity, and the target solution is constantly received from the main tank and at the same time the target solution to the main tank Weight data using the buoyancy of the target solution by the buoyancy hole is connected to one of the buoyancy hole and the buoyancy hole for detecting the weight of the target fluid flowing uniformly in the fluid microfluidic flow tank to discharge the fluid movement flow tank Specific gravity detection unit having a strain gauge to measure, the temperature sensing unit for detecting the temperature of the target solution flowing uniformly in the fluid movement flow tank and outputs the corresponding temperature data, the specific gravity detection unit and the temperature Specific gravity value of the target solution by receiving weight data and temperature data from the detector The control box calculates and stores the measured data, compares the previously stored statistical data with the measured data which is the specific gravity value of the measured solution, and outputs various control signals corresponding thereto, and the specific gravity compensation control signal from the control box. Consisting of a specific gravity compensation unit for supplying water or a solution for the specific gravity compensation of the target solution to the main tank at the same time as receiving the input, and an alarm unit for receiving a warning signal from the control box and alarming the corresponding warning light and alarm. do.

However, the specific gravity measurement compensator of the flow fluid using the strain gauge has the disadvantage that the output value of the strain gauge is different depending on the level of the target solution to be filled in the fluid microfluidic flow tank, there is a pulsation according to the vibration of the flowing solution has to read the average value Therefore, there is a disadvantage that precise measurement is impossible.

Accordingly, an object of the present invention is to provide a non-contact type by measuring the floating height of the hydrometer floating in the inner container using a sensor when there is no overflow occurs from the inner container to the outer container by supplying the flux to the inner container of the double container, To provide a specific gravity measuring device that can accurately measure the specific gravity of the flux.

Another object of the present invention is to provide a specific gravity measuring device for arranging a balance in the lower portion of the measuring vessel to measure the specific gravity of the flux by measuring the weight of the measuring vessel when the overflow does not occur in the measuring vessel.

Another object of the present invention is to measure the specific gravity of the flux stored in the main tank using the above specific gravity measuring device, and to control the specific gravity of the main tank always constant regardless of the flux level of the main tank, mixer and foaming device The flux concentration is uniformly distributed in the main tank by measuring the measured temperature and the measured specific gravity, and the temperature compensation weight of the flux is placed between the upper limit value and the lower limit value by compensating the temperature with the standard specific gravity according to the temperature. It is to provide a flux specific weight management device that can compensate for the specific gravity of the flux.

Preferred embodiments of the present invention for achieving the above object will be described in detail with reference to the drawings.

Referring to FIG. 1, in the specific gravity measuring apparatus 1 according to the first embodiment of the present invention, a supply pipe 15 is connected to an inner container 11 of a double container 10, and an outside of the double container 10. A discharge pipe 17 is connected to the container 13, a hydrometer 19 is disposed in the inner container 11, and a photo is provided on the lifting member 25 that is lifted up and down along the rotation shaft 23 of the stepping motor 21. The coupler 27 is mounted, and the photo coupler 27 measures the floating height of the hydrometer 19 and transmits a signal to the central processing unit 29 while the elevating member 25 is being lowered. In (29), the specific gravity of the solution is determined, and the zero point setting sensor 31 disposed at the upper end of the rotating shaft 23 detects the indicator 33 of the elevating member 25 to zero the elevating member 25. The point is detected, and the specific gravity of the solution is displayed on the display unit 37 by the central processing unit 29.

Using the specific gravity measuring device configured as described above can set the specific gravity of the solution as follows.

When no overflow occurs from the inner container 11 to the outer container 13 by supplying the solution overflowed to the inner container 11, the zero point of the elevating member 25 shown in solid line in FIG. 1. From the lifting member 25 is lowered. At this time, when the elevating member 25 reaches the position shown by the dotted line in Figure 1, the photo coupler 27 measures the height h of the hydrometer 19 floating in the solution, and this value is determined by the hydrometer 19 When the scale of the scale is set to the central processing unit 29, the central processing unit 29 calculates the height of the hydrometer 19 which changes according to the change in the specific gravity (concentration) of the solution. Can compute a value. In addition, the user can increase the reliability of the specific gravity measurement by checking whether the actual specific gravity value and the actual specific gravity value observed by the user match.

Referring back to FIG. 1, the specific gravity measuring apparatus further includes a temperature sensor 35 disposed in the outer container 13 of the double container 10.

As a result, the temperature sensor 35 detects the temperature of the solution supplied to the double vessel 10, so that the central processing unit 29 measures the specific gravity of the solution at the temperature measured by the temperature sensor 35. The temperature compensation may be performed on the specific gravity value measured in comparison with the standard specific gravity at the reference temperature, and the temperature compensation specific gravity may be displayed on the display unit 37.

The display unit 37 displays the measurement specific gravity, the measurement temperature, the standard specific gravity, the upper limit specific gravity, and the lower limit specific gravity. For example, the flux applied to the printed circuit board most preferably has a predetermined concentration at a temperature of 20 ° C. Therefore, by measuring the specific gravity and the temperature and display the temperature compensation by the flux standard specific gravity of 20 ℃, the user can easily know the current measurement ratio and the standard specific temperature compensation. In addition, the user may set the upper limit value and the lower limit value of the temperature compensation ratio while visually confirming the upper limit weight value and the lower limit weight value of the display unit 37.

Referring to Figure 2, the flux specific gravity management device according to the present invention using the specific gravity measurement device configured and acts as described above is equipped with the water level measuring sensors (51, 53) in the flux tank 50, the level of the solution is the lower limit value When the specific gravity (concentration) of the solution is out of the set value, or the flux and diluent is selectively supplied from the solution supply unit 60, and if the water level of the flux tank 50 exceeds the upper limit, through the discharge pipe 55 The solution is discharged to the overflow tank 70, the mixer 57 and the foam pipe 59 are mounted on the flux tank 50 to uniformly mix the solution stored in the flux tank 50, and the flux tank 50 A portion of the solution stored in the) is supplied to the specific gravity measuring device 1 to measure the specific gravity of the solution, and the specific gravity of the measured solution is transferred to the display unit 37 by the central processing unit 29 of the specific gravity measuring device 1. In the central processing unit 29 of the specific gravity measuring unit 1 When the specific gravity of the solution stored in the flux tank 50 is determined and the specific gravity of the solution is below the set value, the solution supply unit 60 supplies a plus to the flux tank 50, and if the specific gravity of the solution is above the set value, the solution supply unit 60 ) Is supplied to the flux tank 50.

In addition, the flux specific gravity management device returns the solution discharged from the specific gravity measuring device 1 to the flux tank 50, and preferentially enters the overflow tank 70 when the solution level of the flux tank 50 reaches the lower limit. The stored solution is fed to the flux tank 50.

Therefore, the flux specific gravity management apparatus according to the present invention automatically measures the concentration of the solution, and by automatically supplying the flux and diluent from the solution supply unit 60 to the flux tank under the control of the central processing unit 29 by The specific gravity of the solution stored in the flux tank 50 is always kept constant.

In FIG. 2, reference numeral □ denotes a pump.

Referring to FIG. 3, in the specific gravity measuring apparatus 101 according to the second embodiment of the present invention, the measuring container 103 is placed on the scale 105, and the measuring container is supplied by supplying a solution to the measuring container 103. When the overflow through the discharge portion 103a of the 103 is stopped, the balance 105 measures the weight of the solution of the measuring vessel 103 and provides the weight data to the central processing unit 107, and the central processing unit In operation 107, the weight data is converted into specific gravity to display the specific gravity of the measurement solution on the display unit 109.

For example, after measuring the weight with the balance 105 by emptying in the 1L measuring container 103, the zero value (0.000) is set, and again the water is filled in the 1L measuring container 103 to measure the weight of the source water. By setting a reference value (1.000), and then fill the solution to be measured in the measuring container 103 to measure the weight of the solution. The central processing unit 107 converts the weight data of the measured solution into specific gravity and displays the specific gravity of the measurement solution on the display unit 109.

Referring to FIG. 4, in the specific gravity measurement apparatus 201 according to the third embodiment of the present invention, an annular lower pedestal 221 is mounted on an upper end of the outer container 211 of the double vessel 210, and the lower pedestal is mounted. Two pillars 223 are installed at the 221, and an upper pedestal 225 having a disc shape is installed at an upper end of the pillar 223, and is disposed between the lower pedestal 221 and the upper pedestal 225. Sensor 231 is mounted on the vertical portion 229a of the rotating member 229 of the rotating member 229 to measure the height of the hydrometer 215 floating in the inner container 213 of the double container 210. do.

The power unit 229 has a horizontal portion 229b disposed below the upper pedestal 225 and connected to the stationary motor 233 disposed in the center of the upper pedestal 225, whereby the vertical portion 229a is provided. Can rotate clockwise and counterclockwise.

The sensor 231 means that the height of the hydrometer can be measured without touching the hydrometer such as an optical sensor or a proximity sensor.

Referring to FIG. 5, in the specific gravity measurement apparatus 301 according to the fourth embodiment of the present invention, a specific gravity measurement container 317 is disposed in an inner container 313 of a double container 311, and the specific gravity measurement container 317 ) Is directly connected to the load cell 319 disposed in the upper portion, and supply the measurement solution to the inner container 313 through the supply pipe 321, when the overflow from the inner container 313 to the outer container 315 is stopped The load cell 319 measures the pressure transmitted through the specific gravity measuring container 317 and transmits data to the central processing unit 323. The central processing unit 323 calculates the pressure value as the specific gravity value and displays the display unit ( 325 displays the measurement weight.

The specific gravity measuring container 317 has a large surface area which minimizes the gap with the inner container 313 of the double container 311 so as to maximize the pressure delivered to the load cell 319, it can be precisely measured with a small amount of solution Can be.

As described above, the specific gravity measuring apparatus according to the present invention and the flux specific gravity manager using the same can accurately measure the specific gravity of the measurement solution in a non-contact manner, and automatically measure the specific gravity (concentration) of the solution stored in the flux tank. And the effect of performing management.

In addition, the flux specific gravity manager according to the present invention may be arranged in the flux tank mixer and foam tube to uniform the concentration of the solution stored in the flux tank, even when the water level of the solution stored in the flux tank exceeds the upper limit value While discharging the solution of the flux tank to the overflow tank, the flux or diluent may be supplied to the flux tank from the solution supply unit to continuously and uniformly manage the specific gravity and level of the flux.

Claims (7)

delete A supply pipe 15 is connected to the inner container 11 of the double container 10, a discharge pipe 17 is connected to the outer container 13 of the double container 10, and a hydrometer 19 is connected to the inner container 11. ) Is disposed, the temperature sensor 35 is disposed in the outer vessel 13 of the double vessel 10, the temperature sensor 35 detects the temperature of the solution supplied to the double vessel 10, stepping The photo coupler 27 is mounted on the elevating member 25 which is moved up and down along the rotary shaft 23 of the motor 21, and the zero point setting sensor 31 disposed at the upper end of the rotary shaft 23 is the elevating member. The marker 33 of (25) is detected to detect the zero point of the elevating member 25, and the photo coupler 27 measures the floating height of the hydrometer 19 while the elevating member 25 is descending. By sending a signal to the central processing unit 29, the central processing unit 29 measures the measured specific gravity of the solution at the temperature measured by the temperature sensor 35 at the standard ratio at the reference temperature. The temperature compensation can be performed on the specific gravity value measured in preparation for, and the display unit 37 can display the measured specific gravity, the measured temperature, the temperature compensation ratio (the ready ratio), the specific gravity upper limit value, and the specific gravity lower limit value. Specific gravity measuring device. The flux tank 50 is equipped with water level measuring sensors 51 and 53 so that the flux and diluent are selectively selected in the solution supply unit 60 when the level of the solution reaches the lower limit or the specific gravity (concentration) of the solution is outside the set value. When the water level of the flux tank 50 exceeds the upper limit, the solution is discharged to the overflow tank 70 through the discharge pipe 55, and the mixer 57 and the foam pipe 59 are connected to the flux tank 50. ) Is uniformly mixed with the solution stored in the flux tank 50, a portion of the solution stored in the flux tank 50 is supplied to the specific gravity measuring device (1) to measure the specific gravity of the solution, Specific gravity is displayed on the display unit 37 by the central processing unit 29 of the specific gravity measuring apparatus 1, and the specific gravity of the solution stored in the flux tank 50 in the central processing unit 29 of the specific gravity measuring apparatus 1 If the specific gravity of the solution is less than or equal to the set value to determine the positive The flux specific gravity management device, characterized in that the supply to the lux tank (50), and if the specific gravity of the solution is more than the set value, the diluent is supplied to the flux tank (50) from the solution supply unit (60). The method of claim 3, wherein The solution discharged from the specific gravity measuring device 1 is returned to the flux tank 50, and when the solution level of the flux tank 50 reaches the lower limit, the solution stored in the overflow tank 70 is first transferred to the flux tank 50. Flux specific gravity management device characterized in that the supply. When the measuring vessel 103 is placed on the scale 105 and the solution is supplied to the measuring vessel 103 and the overflow through the discharge portion 103a of the measuring vessel 103 is stopped, the scale 105 The weight of the solution of the measuring container 103 is measured to provide the weight data to the central processing unit 107, and the specific gravity of the measurement solution to the display unit 109 by converting the weight data into specific gravity in the central processing unit 107. Specific gravity measurement device characterized in that the display. An annular lower pedestal 221 is mounted on the upper end of the outer container 211 of the double container 210, two pillars 223 are installed on the lower pedestal 221, and an upper end of the pillar 223 is provided. A disk-shaped upper pedestal 225 is installed, and a sensor 231 is mounted on the vertical portion 229a of the rotating member 229 of "∩" between the lower pedestal 221 and the upper pedestal 225, Specific gravity measurement device characterized in that the sensor measures the height of the hydrometer (215) floating in the inner container (213) of the double container 210 (231). The specific gravity measuring container 317 is disposed in the inner container 313 of the double container 311, and the specific gravity measuring container 317 is directly connected to the load cell 319 disposed on the upper portion thereof, and the measurement solution is supplied to the supply pipe 321. Supply to the inner container 313 through, when the overflow from the inner container 313 to the outer container 315 is stopped, the load cell 319 measures the pressure transmitted through the specific gravity measuring container 317 to the central processing unit 323, and the central processing unit 323 calculates the pressure value as the specific gravity value and displays the measurement specific gravity on the display unit 325.

Images