TW201916770A - Scraper system - Google Patents

Abstract

A scraper system including a carrier device, a heating device, and a leveling device. The heating device is used to heat an object to be redo. The leveling device includes a support frame provided on the carrier device, and a scraper provided on the support frame for leveling the part to be redo. The support frame is movable relative to the carrier along the X, Y, Z axis of the three-dimensional for the reciprocating movement. By the structural design of the leveling device, the yield rate could be improved.

Description

 Scraper whole tin rework system  

The present invention relates to a heavy equipment, and more particularly to a scraper tin rework system.

The metal protection methods commonly used in the printed circuit board (PCB) industry are: hot-air solder leveling (HASL), organic solderability preservatives (OSP), Immersion nickel, Immersion gold, and Immersion Sn. Among them, tin spray is the most commonly used treatment method. Due to its low cost, unique physical properties with low melting point of tin and mechanical properties of thermal fatigue reliability, the application history has been more than 50 years, but in environmental regulations. The fate of the ban will be banned.

In addition, the affected process of the PCB factory is also the etching resist on the PCB tin-lead plating, and the tin-plated solder process of the final metal surface treatment. Among them, tin-lead plating needs to be replaced by pure tin plating, but pure tin plating is prone to tin whisker problems. Therefore, tin whisker must be prevented by first nickel plating or tin plating and reflow soldering. The purpose of the final metal surface treatment is to increase the tint of the metal contacts for soldering. In the past, the PCB was immersed in a tin furnace by a tin-lead process, and then the excess solder was removed by hot air. At present, the major PCB manufacturers changed. Surface treatment is carried out with Organic Solderability Preservatives (OSP), nickel metallurgy, chemical silver, and chemical tin. The lead-free change of the surface treatment increases the cost of raw materials of the PCB factory by 3-5%.

In addition, after plating with pure tin, if the plating quality is not good, for example, if the amount of tin slag is too high or the height is too high, it is usually necessary to reheat the plating layer to make it melt, and then re-level the treatment (generally referred to as "rework" in the industry). . The existing method is to manually perform a flattening action by a hand-held tool (for example, a cotton swab), but the disadvantage is that the operator has different results depending on the proficiency, and there is still the possibility of tin whisker.

Accordingly, it is an object of the present invention to provide a scraper tin rework system that increases the yield of heavy work.

A scraper tin rework system includes a load bearing device for carrying a heavy object to be reworked, a heating device, and a leveling device. The heating device is configured to heat the object to be reworked, so that a portion to be reworked on the object to be reworked is molten. The screed device includes a support frame disposed on the support device, and a scraper disposed on the support frame for leveling the portion to be reworked of the object to be reworked, wherein the support frame is relative to the support device Three-dimensional reciprocating movement of the X, Y, and Z axes is performed.

Another technical means of the present invention is that the carrying device comprises a base, and a loading platform disposed on the base and reciprocating along the Y axis relative to the base, wherein the object to be reworked is placed on the loading platform on.

Another technical means of the present invention is that the stage has a rework area and a cleaning area spaced from the rework area, and the scraper tin rework system further includes a cleaning device disposed in the cleaning area. The cleaning device is used to clean the scraper.

A further technical means of the present invention is that the scraper tin rework system further comprises a waste heat recovery power generation device disposed on the heating device for recovering waste heat generated by the heating device.

Another technical means of the present invention is that the cleaning device comprises a motor and at least one cleaning brush driven by the motor, and the electric power generated by the waste heat recovery power generation device is used to drive the motor.

Yet another technical means of the present invention is to further include a monitoring device including a camera disposed on the support frame and aligned with the blade, and a display screen electrically connected to the camera.

A further technical means of the present invention is that the waste heat recovery power generation device comprises a heat conduction unit covering a local position of the heating device, a refrigeration unit disposed on the heat conduction unit, and an electrical connection unit. a power generating unit and a heat dissipating unit disposed on the cooling unit.

Another technical means of the present invention is that the refrigeration unit comprises a plurality of sheets of refrigerated wafers electrically connected in series.

Yet another technical means of the present invention is that the power generating unit includes a booster circuit.

According to still another aspect of the present invention, the heat dissipating unit includes a joint portion that contacts the refrigerant unit, and a heat dissipating portion that is disposed on the joint portion.

The beneficial effect of the invention is that, by the structural design of the screed device, the flattening work of the object to be reworked is performed with the scraper, and the rework rate is greatly improved.

2‧‧‧ Carrying device

21‧‧‧Base

22‧‧‧

221‧‧‧Rework area

222‧‧‧Clean area

3‧‧‧ heating device

4‧‧‧Leveling device

41‧‧‧Support frame

42‧‧‧ scraper

5‧‧‧Waste heat recovery power generation unit

51‧‧‧thermal unit

52‧‧‧ Refrigeration unit

521‧‧‧Chilled wafer

53‧‧‧heating unit

531‧‧‧Combination Department

532‧‧‧ Department of heat dissipation

54‧‧‧Power unit

6‧‧‧Monitor

61‧‧‧ camera

62‧‧‧ display screen

7‧‧‧ cleaning device

71‧‧‧Motor

72‧‧‧ cleaning brush

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a preferred embodiment of the doctor blade tinning rework system of the present invention; Fig. 2 is a side view, which is an explanatory view of Fig. 1; and Fig. 3 is a partial side view showing a heating in the preferred embodiment. FIG. 4 is a perspective view showing a flattening device of the preferred embodiment ready for heavy work; FIG. 5 is a partial enlarged view of the same, and FIG. 7 is a perspective view showing that the leveling device is ready for cleaning; and FIG. 8 is a partial enlarged view of the same, and FIG. 7 is additionally explained.

The detailed description of the preferred embodiments of the present invention will be apparent from the detailed description of the preferred embodiments. It should be noted that, before the detailed description, similar elements are denoted by the same reference numerals.

Referring to FIG. 1 and FIG. 2, a preferred embodiment of the scraper tin rework system of the present invention comprises a carrier device 2 for carrying a workpiece to be reworked, a heating device 3, a leveling device 4, and a waste heat recovery system. A power generating device 5, a monitoring device 6, and a cleaning device 7. It should be noted that, because of the relationship of the angle of view, and because the structure of the object to be reworked is not the focus of the present case, the object to be reworked is not depicted in each drawing. In addition, among the X, Y, and Z axes indicated in each drawing, the X axis represents left and right movement, the Y axis represents forward and backward movement, and the Z axis represents up and down movement.

The carrying device 2 includes a base 21 and a stage 22 disposed on the base 21 and reciprocable relative to the base 21 along the Y-axis. The object to be reworked is placed on the stage 22. The stage 22 has a rework area 221 and a cleaning area 222 spaced from the rework area 221.

The heating device 3 is configured to heat the object to be reworked, so that one of the parts to be reworked on the object to be reworked is molten. In the present embodiment, the heating device 3 is a heat gun.

The leveling device 4 includes a support frame 41 disposed on the base 21 of the carrier device 2, and a scraper 42 disposed on the support frame 41 for leveling the portion to be reworked of the object to be reworked. The support frame 41 can perform three-dimensional reciprocating movement of the X, Y, and Z axes with respect to the carrier device 2.

Referring to FIG. 3, the waste heat recovery power generation device 5 includes a heat conduction unit 51 covering a local position of the heating device 3, a refrigeration unit 52 disposed on the heat conduction unit 51, and a refrigeration unit 52 disposed on the refrigeration unit 52. The heat dissipation unit 53 and a power generation unit 54 electrically connected to the refrigeration unit 52. The refrigeration unit 52 includes a plurality of fins 521 electrically connected in series, the power generating unit 54 being electrically connected to the refrigerating wafer 521 and including a boosting circuit. The heat dissipation unit 53 includes a joint portion 531 that is in contact with the refrigerant unit 52, and a heat dissipation portion 532 disposed on the joint portion 531.

Referring to FIG. 1, the monitoring device 6 includes a camera 61 disposed on the support frame 41 and aligned with the blade 42, and a display screen 62 electrically connected to the camera 61.

The cleaning device 7 is disposed in the cleaning area 222 of the stage 22 and is used to clean the blade 42. The cleaning device 7 includes two motors 71, and two cleaning brushes 72 respectively driven by the motor 71, and the electric power generated by the waste heat recovery power generation device 5 is used to drive the motor 71.

The following description will explain the manner of use of the preferred embodiment. As shown in FIG. 1, the support frame 41 of the leveling device 4 is located at a ready position away from the rework area 221 prior to the heavy work. The object to be reworked is placed on the stage 22 of the carrying device 2 and placed in the rework area 221. When the object to be reworked has been placed in position, the support frame 41 moves along the Z axis to a rework position near the rework area 221 as shown in FIGS. 4 and 5, so that the leveling device 4 The scraper 42 slightly contacts the portion to be reworked of the object to be reworked. At this time, the heating device 3 is started to heat the object to be reworked, so that one of the parts to be reworked on the object to be reworked is molten, and the scraper 42 is also preheated to start heavy work. At the same time, the scraper 42 also reciprocates slightly along the Y-axis, and the molten solder is leveled to improve the situation that the dross is too high or the solder height is too high. Since the camera 61 is aligned with the scraper 42, the operator can clearly observe the leveling action of the scraper 42 through the display screen 62, and understand the rework conditions of the reworked objects.

When the heavy work is completed, the support frame 41 of the leveling device 4 will return to the prepared position away from the rework area 221 along the Z axis (as shown in FIG. 1), and the support frame 41 will follow the X again. The axis moves and moves from Figure 1 to the position shown in Figure 6. At the same time, the stage 22 will also move along the Y axis relative to the base 21, and will move from the position shown in FIG. 1 to the position shown in FIG. 6, so that the cleaning device 7 is located below the support frame 41. Next, the support frame 41 of the leveling device 4 is lowered along the Z-axis to the cleaning device 7 as shown in Figs. 7 and 8, and the cleaning device 7 is used to clean the blade 42. When the scraper 42 is lowered between the two cleaning brushes 72 of the cleaning device 7, the two motors 71 simultaneously start and drive the two cleaning brushes 72 to rotate, and the scraper 42 also slightly between the two cleaning brushes 72. Move to clean both sides of the two scrapers 42.

It is to be noted that the starting power of the two motors 71 is provided by the waste heat recovery power generation device 5. Referring to FIGS. 3 and 6, when the heating device 3 is in operation, thermal energy generated by the heating device 3 is diffused to the heat conducting unit 51 and further transmitted to the cooling wafer 521 of the cooling unit 52. By disposing the heat radiating unit 53 on the cooling unit 52, the conduction rate of thermal energy can be increased to accelerate the thermoelectric conversion efficiency of the refrigerant wafer 521. Since those skilled in the art can understand the operation principle of the refrigerant chip 521, no further details will be described. In the present embodiment, the two cooling fins 521 are electrically connected in series to increase the voltage, and at the same time, the boosting circuit is provided in the power generating unit 54 to raise the voltage to 5V (DC). In actual implementation, the number of the cooling fins 521 and the form of the boosting circuit can also be selected as needed to boost the voltage to a desired size. The waste heat generated during the operation of the heating device 3 is recovered in the foregoing manner, and the waste heat is converted into electric energy through the refrigeration unit 52 and the power generation unit 54 for use by the two motors 71 of the cleaning device 7. It is to be further noted that since the electrical connection mode of the power generating unit 54 to the two motors 71 is understood by those skilled in the art, it is omitted in the drawings.

After the cleaning operation described above, the leveling device 4 can be returned to the preparation position away from the rework area 221 (as shown in FIG. 1), and the next heavy work of the object to be reworked can be performed.

As can be seen from the above description, the scraper tin rework system of the present invention does have the following advantages:

First, the rate of heavy industry improvement:

In this case, the process and tools of the heavy work industry are standardized. The original operator will have different results according to the proficiency; after the introduction of the automation equipment, the conditions and methods are the same, the effect is the same, and the use of the scraper 42 can make the recovery rate of the object to be reworked. The stability is more than 95%.

Second, save labor costs

Originally, the cleaning method of the scraper 42 is performed manually, so that it is stopped every time the heavy work is performed, and if it is not cleaned, it may affect the yield of the next heavy work. The cleaning operation of the scraper 42 is directly performed by the cleaning device 7, which not only saves labor costs, but also improves the progress rate of the heavy work.

Third, take into account environmental appeals

The waste heat generated by the heating device 3 during the operation is recovered and used for power generation, and is supplied to the cleaning device 7 for cleaning operation, which not only reduces waste heat in the environment, but also reduces the power consumption of the commercial power used by other devices. And can achieve the purpose of energy saving and environmental protection.

In summary, the scraper tin rework system of the present invention standardizes the process and tools of the heavy work industry, improves the yield of heavy work, cleans the scraper 42 with automated equipment, saves labor costs, and then generates the heating device 3. The waste heat is recovered and power is supplied to the cleaning device 7, and energy saving and carbon reduction are achieved, so that the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

Claims (10)

 A scraper tin-recycling system comprises: a carrying device for carrying a workpiece to be reworked; and a heating device for heating the object to be reworked, so that a part to be reworked on the object to be reworked is molten; a flattening device comprising a support frame disposed on the support device, and a scraper disposed on the support frame for leveling the portion to be reworked of the object to be reworked, wherein the support frame can be opposite to the load The device performs three-dimensional reciprocating movement of the X, Y, and Z axes.    The scraper tin rework system according to claim 1, wherein the carrying device comprises a base, and a stage disposed on the base and reciprocally movable relative to the base along the Y axis. The object to be reworked is placed on the stage.    The scraper tin rework system according to claim 2, wherein the stage has a rework area, and a cleaning area spaced from the rework area, and the scraper tin rework system further comprises a A cleaning device for the cleaning area, the cleaning device is for cleaning the blade.    The scraper tin rework system according to claim 3, further comprising a waste heat recovery power generation device disposed on the heating device for recovering waste heat generated by the heating device.    According to the scraper tin rework system of claim 4, the cleaning device includes a motor and at least one cleaning brush driven by the motor, and the electric power generated by the waste heat recovery power generating device is used to drive the motor. .    The scraper tin rework system according to claim 1, further comprising a monitoring device comprising a camera disposed on the support frame and aligned with the blade, and a display screen electrically connected to the camera.    The scraping tin-recycling system according to the fourth aspect of the invention, wherein the waste heat recovery power generating device comprises a heat conducting unit covering a local position of the heating device, a cooling unit disposed on the heat conducting unit, A power generating unit electrically connected to the cooling unit and a heat dissipating unit disposed on the cooling unit.    The scraper tin rework system of claim 7, wherein the refrigerating unit comprises a plurality of refrigerated wafers electrically connected in series.    The scraper tin rework system according to claim 7, wherein the power generating unit comprises a booster circuit.    The scraper tin rework system according to claim 7, wherein the heat dissipating unit comprises a joint portion in contact with the refrigerating unit, and a heat dissipating portion disposed on the joint portion.