JP2015058458A - Small electric heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple and small electric heater which can remove an electronic component from a mounting substrate.SOLUTION: A small electric heater includes a heater part, a heater holding part for holding the heater part, and an energization operation part for operating energization to the heater part. The heater part includes: a heater rod with a heater lead wire, a heater lead wire protection material, and a flat wire coil part for heat accumulation formed by winding two flexible metal flat wires from a red-heat center part of the heater rod to both ends by closely bonding and fixing while closely remaining a flat wire iron tip part. An electronic component is held by a clipping tool with a ceramic-coated fine tip end through the flat wire iron tip part, and is removed from a mounting substrate by melting solder. The heater holding part includes: a coil part for holding a heater rod which is wound, bonded and fixed with a metal wire on a heater lead wire side of the heater rod; a coil part for heat radiation folded so as to be easy to use; and a coil part for attaching a finger tip on an opposite end to the heater rod.

Description

The present invention relates to a small electric heater used for removing an electronic component from a mounting substrate.

There is a demand for a small electric heater that can be used simply and efficiently as an instrument for removing an electronic component from a mounting substrate.
For example, Patent Document 1 discloses a small electric heater called a high-performance hot tweezers that can be used to remove an electronic component.

  The hot tweezers and the tip are provided with a tip connected by a connecting mechanism in which a pair of leg portions approach and separate in a state of being parallel to each other so that the electronic component can be held while being heated. For example, it is possible to remove the electronic component from the mounting board by moving the two tips with the thumb and the index finger to hold the electronic component and melting the solder.

JP 2004-314112 A

Conventional hot tweezers used a ceramic heater rod made of ceramic with a general-purpose heater lead wire in the heat generating part.
In order to hold the electronic parts, the heater rod is put in two legs and the heat is transferred to the legs, and then transferred to each tip at the tip of the legs. In order to heat the heat generated by the heater rod in the radial direction on the outer peripheral side to heat the leg, the diameter of the leg must be increased.
Therefore, in order to pinch a fine electronic component, the leg portion becomes too thick, and it is necessary to move the tip away from the heater rod. The heating part of the high-performance hot tweezers described in Patent Document 1 that can be used to remove the electronic component uses a heater core heating method without using a general-purpose heater rod. Wrap the heating wire around the insulation cover of the heater core, and put the heater core in a thin part that is not wound in the tip. The distance from the tip to the tip was close.

Therefore, there has been a demand for a small electric heater that uses a conventional general-purpose heater rod and has a tip as close as possible to the red hot center of the heater rod and has a simple structure and good heat transfer efficiency.

  The present invention provides two tips at the red hot center of the heater rod, and can pinch a fine electronic component using a holding tool to melt the solder and remove it from the mounting board, and more quickly. It is an object of the present invention to provide a small electric heater having a simple structure capable of improving heating and heat transfer efficiency.

  The present invention is a small electric heater of a type in which a heater rod is not inserted into a tip. The flat wire tip portions of the two flexible metal flat wires are left close to each other to form two tips. Then, it winds closely to both ends, adhering and fixing from the red hot center part of a heater rod, and makes two rectangular wire heat storage coil parts. Since this small electric heater is provided with a tip part on the side surface of the red hot center part of the heater rod, it is excellent in terms of rapid heating and heat transfer efficiency. Also, the heater rod holding coil part wound and fixed with a metal wire around the heater lead wire side of the heater rod, the heat dissipating coil part bent for easy use, and the fingertip mounting coil opposite to the heater rod A portion. The method of use is to hold the electronic component through a flat wire tip with a ceramic coated nipping tool with a thin tip, melt the solder and remove it from the mounting board. Thus, even if the tip portion is provided on the side surface of the heater rod, it is not difficult to use, and is excellent in terms of ease of use. That is, the problem to be solved by the present invention is solved by the invention having the following configuration.

A small electric heater according to a first aspect of the present invention includes a heater unit, a heater holding unit that holds the heater unit, and an energization operation unit that operates energization of the heater unit. The heater rod with the heater lead wire, the heater-lead wire protector that protects the heater lead wire, and the flat wire tip of the two flexible metal flat wires are kept in close contact with each other. It consists of a rectangular wire heat storage coil portion that is tightly wound around both ends while being bonded and fixed from the red heat center portion. The heater holding portion includes a heater rod holding coil portion that is wound and fixed to a heater rod with a metal wire on the heater lead wire side of the heater rod, a heat dissipation coil portion that can be bent for ease of use, and a heater rod. Is a small electric heater characterized in that it has a fingertip mounting coil portion that can be attached to and detached from the finger at the opposite end.

The metal rectangular wire is a flexible high heat transfer material, and examples thereof include copper and copper alloys. Because it is flexible, it means that plastic deformation is possible. In addition, because of the high heat transfer material, the rectangular wire heat storage coil part can be used for the thermal expansion and cooling shrinkage of the heater rod. The rod is adhered and fixed in close contact with ceramic adhesive. For the flat wire tip part, the distance between the tips of the two flat wire tip parts is increased, and then the electronic parts are sandwiched and sandwiched via the flat wire tip part, thereby heating rods. This heat can be efficiently used to melt the solder of electronic components.

  The small electric heater of the present invention is not provided with a holding mechanism. Therefore, as a mounting aid, there is prepared a holding tool for precision radio pliers which is coated with ceramic and is bent at an angle of about 30 degrees only at the portion of the tip which is always opened by a compression coil spring. The pinch tool is always opened by the force of the compression coil spring, and when the pinch is held, the force is applied, and when the work is finished, the pin returns to the open state. A holding tool using a leaf spring may be used instead of the compression coil spring. The ceramic coating keeps the heat of the flat wire tip part from being taken away by the gripper as much as possible. Therefore, it is preferable that only the portion gripped by the tip is made of a ceramic material or a heat-resistant resin material. Using the holding tool, the side part of the flat wire tip part is brought into intimate contact with the terminal of the mounting board at the bottom part of the flat wire tip part. Other names for precision radio pliers include precision pliers and tweezers. Further, tweezers using a leaf spring and having a ceramic coating at the tip may be used.

  The heater holding portion includes a heater rod holding coil portion, a heat radiating coil portion, and a fingertip mounting coil portion. As the metal wire, one thin metal wire having rigidity is used. The material is steel and alloy steel such as chrome steel wire, nickel steel wire, stainless steel wire and the like. A piano wire, a stainless steel wire, etc. are preferable. The heater rod holding coil portion is a portion connecting the heater holding portion to the heater rod. It is wound around a heater rod with a metal wire and fixed tightly with a ceramic adhesive. The heat radiating coil portion is a portion that radiates heat so that heat from the heater rod is not transmitted to the fingertip mounting coil portion. Preferably, the metal wire is thinned to make it difficult to transfer heat. Further, the tip portion is bent by about 30 degrees so that the heat radiation coil portion can be easily operated so as to be parallel to the mounting substrate during the operation. When the finger is inserted with the silicon tube covered only on the metal wire of the finger attachment coil portion of the heater holding portion, the finger may not be directly contacted with the metal wire to further protect against heat. The energization operation unit is held by a palm in the vicinity of the fingertip mounting coil unit of the heater holding unit.

In this small electric heater, for example, the index finger of the right hand is placed in the coil part for attaching the fingertip of the heater holding part, and a heat radiating coil part is provided so as not to transmit the heat of the heater rod. Adhere and fix to the part. With a left hand, a ceramic-coated holding tool with a thin tip is held, and an electronic component is held through a flat wire tip at the tip of a flat wire heat storage coil wound around a heater rod. Hold the holding switch case of the energizing operation part that operates the energization of the heater part with the right palm, and by pressing the push button protruding on the surface, the switch is turned on to melt the solder and remove the electronic component from the mounting board. After removing the electronic component from the mounting board, release the right palm and stop energizing the heater rod.

  According to a second aspect of the present invention, the heater lead wire coming out of the heater rod is covered with a heat-resistant tube of a heater lead wire protective material for short circuit prevention, and consists of a metal wire of the heater lead wire protective material for disconnection prevention. The small electric heater according to claim 1, wherein the small electric heater is inserted into a coil for preventing disconnection of a heater lead and connected to an energizing operation unit. A polyimide tube is used as the heat-resistant insulating tube. The heater lead disconnection preventing coil uses a compression coil spring, and the wire is made of hard steel wire or alloy steel for spring, preferably piano wire or stainless steel wire. The heater lead disconnection prevention coil is provided to prevent disconnection of the heater lead when the holding switch case in the hand is accidentally dropped.

  The heater part of the small electric heater of the present invention comprises a rectangular wire heat storage coil part wound closely to both ends while being bonded and fixed from the red hot center part of the heater rod using two flexible metal rectangular wires. make. Therefore, the rectangular wire heat storage coil portion can cope with the thermal expansion and cooling contraction of the heater rod. As a result, the heat of the heater rod can be transmitted not by point contact but by surface contact heat conduction, so heat transfer efficiency is good. Moreover, although the tip part corresponding to the heat storage part of the conventional hot tweezers or the hot tweezers described in Patent Document 1 is at the tip of the heat generation part, the rectangular wire heat storage coil part of the heat storage part of the present invention is the heat generation part. Because it is wound around the heater rod, thermal response is good.

Holding the holding switch case of the energizing operation unit that controls energization of the heater unit with the palm of the hand, the switch is turned on by firmly grasping the push button switch protruding from the surface, and the solder is melted to remove the electronic component from the mounting board. After removing the electronic component from the mounting board, loosen the palm and stop energizing the heater rod. Since the switch is turned on and off each time it is removed, the heater is used in the process of raising the temperature from a low temperature, preventing evaporation of the flux contained in the solder, and soldering the flat wire tip. Can make it easy to get wet. Also, do not transmit excess heat to the finger mounting coil as much as possible. Furthermore, since the time when the temperature of the heater section is 400 degrees or more can be shortened, the iron plating used for the base of the solder plating can be protected from being eaten by the solder, and the small electric heater can be used for a longer time.

Even if the outer shape of the coil portion for rectangular heat storage becomes thick, it does not affect the operability of removing the electronic parts so much, so a heater rod having a large diameter and a large heat capacity can be used. Moreover, a small electric heater with a large heat capacity of the rectangular wire heat storage coil portion can be made by using a large metal rectangular wire. However, it is necessary to lengthen the heat dissipation coil portion of the heater holding portion as much as the heat capacity of the heater portion is increased.

It is a perspective view which shows an example of the small electric heater of this invention. It is a disassembled perspective view which shows a part of structure of the one usage pattern of the small electric heater of this invention. It is a perspective view which shows a part of structure of the one usage form of the small electric heater of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the following embodiments and examples are merely examples of the present invention and do not limit the present invention. The following embodiments and examples can be modified without departing from the spirit of the present invention.

  The small electric heater of this invention has a heater part, a heater holding | maintenance part, and an electricity supply operation part. The heater section includes a heater rod, a heater lead wire, a heater lead wire protective material, a flat wire heat storage coil portion, and a flat wire tip portion. The heater rod is a rod-shaped ceramic heater with a heater lead wire, and generates heat when energized.

The two heater lead wires preferably form a stranded wire and are electrically insulated with, for example, a polyimide thin pipe of a heat-resistant insulating tube of a heater lead wire protective material for short circuit prevention, and further, heater lead wire protection for disconnection prevention It is possible to protect against breakage due to shocking force of the material, and it can be moved freely and placed in a coil for preventing breakage of heater lead of compression spring coil made of flexible metal wire so that there is no stress.
The heater lead disconnection prevention coil is taken out from the heater rod between the heat dissipation coil portion of the heater holding portion and the fingertip mounting coil portion, and is fixed by a bush or the like at the opening portion of the energization operation portion. The terminal end of the heater lead wire is connected to a power cord with an AC outlet via an electrical component inside the energizing operation unit.

  It consists of a rectangular wire heat storage coil portion that is closely wound around both ends of the heater rod, with the rectangular wire tip portion of the flexible metal rectangular wire left in close contact, and adhesively fixed from the red hot center portion of the heater rod. The entire flat metal wire is plated with iron, which is incompatible with solder, and preferably plated with nickel or chrome, and then the solder wire is plated only on the tip of the flat wire.

  The energization operation unit is for operating energization of the heater rod, and includes a holding switch case incorporating a push button switch and a heater lamp, and a power cord with an AC outlet. Instead of the push button switch, a slide switch or a torque switch that can be operated with a fingertip to turn on / off the power may be used. Also, the power cord heater rod with AC outlet uses 30W 100V AC, but for safety, for example, a low voltage 12V DC 30W heater rod is attached to a protective switch case with a DC jack and a switching AC adapter. May be used.

Next, a more specific example and usage of the small electric heater of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an example of a small electric heater according to the present invention.
FIG. 2 is an exploded perspective view showing a part of the configuration of an example of the small electric heater of the present invention.

The heater rod 1 in the figure is a ceramic heater rod made of ceramic with a heater lead wire of a 100V30W specification soldering-compatible product having an outer diameter of 5 mm, a length of 40 mm, and a red hot center portion of 15 mm from the tip. Each of the two heater leads has a stranded wire outer diameter of 0.3 mm and a length of 120 mm. However, since the heater lead wire is sintered at a high temperature during sintering, fine irregularities and distortions are generated on the outer peripheral surface, and the true cylindricality is poor. Therefore, if the conventional heater rod is inserted into the tip, the sintered heater rod must be ground or the insertion hole of the tip must be enlarged. The metal rectangular wire of the present invention is wound while being in close contact (a gap of about 0.1 mm) while being in close contact and adhesively fixed.

  Two 1.4 × 1.4 mm plated copper flat wires with a length of 220 mm are brought into close contact with each other, leaving a portion of the flat wire tip portion 7 having a length of about 8 mm. A rectangular wire heat storage coil portion 6 is manufactured by tightly winding at both ends while being bonded and fixed to the heater rod 1 with a ceramic adhesive from the red hot center portion.

Heater lead wire 2 is a heater lead made of a metal wire of a heater lead wire protective material for preventing disconnection by covering a twisted wire of two lead wires with a polyimide tube of a heat-resistant insulating tube of a heater lead wire protective material for preventing short circuit. Insert into the coil 5 for preventing disconnection. The heater lead disconnection preventing coil 5 is fixed to a rubber bushing or the like of the introduction opening portion of the heater lead wire 2 of the holding switch case 12. Polyimide tube
The holding switch case 12 is covered until just before connection with the electronic components inside. The two stranded wires are connected to a power cord 15 with an AC outlet via a fuse or the like, a heater lamp 14 or a push button switch 13 for operating the heater. The holding switch case 12 preferably has a size of about 15 × 25 × 60 mm.

  Specifically, the two stranded wire heater leads 2 have a stranded wire diameter of 0.3 mm and a length of 120 mm. Put only one of the two stranded wires in the polyimide tube of the small diameter heat-resistant insulating tube 3 with an inner diameter of 0.4 mm, an outer diameter of 0.5 mm and a length of 110 mm, and then with the remaining bare heater lead wire, The heater lead wire 2 is heat-insulated by covering in a polyimide tube of a medium-diameter heat-resistant insulating tube 4 having an inner diameter of 0.9 mm, an outer diameter of 1.0 mm and a length of 110 mm. The heater lead wire 2 thus heat-insulated is placed in a compression coil spring of a flexible heater lead disconnection preventing coil 5 having an outer diameter of 3.0 mm and a length of 80 mm. A stainless steel wire having a wire diameter of 0.2 mm is used as the wire for the compression coil spring.

  The heater holding portion includes a heater rod holding coil portion 8, a heat radiating coil portion 9, and a fingertip attaching coil portion 10. That is, the heater holding part is composed of a coil of one metal wire, and the wire is mechanically wound using a stainless steel wire having a wire diameter of 1.0 mm and a length of about 900 mm.

The heater rod holding coil portion 8 has a heater rod 1 of 5.0 mm in outer diameter and 10 turns to an outer diameter of 4.8 mm and is wound into a coil spring shape, and then 7 turns into a rugby ball shape with a maximum diameter. Machine wind to be 25 mm, and finally machine wind 6 turns in the shape of a finger. The total length of the heater holding part is about 70 mm. However, the finger shape differs by the number of people, so a typical finger shape is created. For example, 8 patterns of 4 shapes for men and 4 shapes for women are manufactured by mechanical winding. When you start using it, adjust the coil shape to your finger by expanding, contracting, or extending it.
Apply ceramic adhesive to the heater rod holding coil portion 8 of the heater holding portion from the heater lead wire side of the heater rod 1 to about 10 mm, and cover the heater rod with a coil diameter slightly wider than 5.0 mm. To fix.

  FIG. 3 is a perspective view showing a part of the configuration of one usage pattern of the small electric heater of the present invention. Between the two rectangular wire tip portions 7, the electronic component terminal 17 on the mounting board is shown. An example is shown in which an electronic component 16 that is soldered on is inserted and held with a holding tool 18 of a precision radio pliers via a flat wire tip portion 7.

1 Heater rod
2 Heater lead wire
3 Small diameter heat-resistant insulation tube
4 Medium diameter heat resistant insulation tube
5 Heater lead break prevention coil
6 Rectangular wire heat storage coil
7 Flat wire tip
8 Coil part for holding heater rod
9 Heat dissipation coil
10 Fingertip mounting coil
11 fingers
12 Holding switch case
13 Pushbutton switch
14 Heater lamp
15 Power cord with AC outlet
16 Electronic components
17 Terminal for electronic parts
18 Nippers

Claims (2)

  A heater unit; a heater holding unit that holds the heater unit; and an energization operation unit that operates to energize the heater unit. The heater unit includes a heater rod with a heater lead wire, and a heater lead. The heater-lead wire protector that protects the wire and the flat wire tip part of the two flexible metal flat wires are left in close contact, and they are wound closely on both ends while being bonded and fixed from the red hot center of the heater rod. It consists of a coiled part for rotating rectangular wire heat storage. The heater holding portion includes a heater rod holding coil portion that is wound and fixed to a heater rod with a metal wire on the heater lead wire side of the heater rod, a heat dissipation coil portion that can be bent for ease of use, and a heater rod. Has a coil part for attaching a fingertip, which can be attached to and detached from the finger, at the end on the opposite side.   The heater lead wire coming out of the heater rod is covered with a heat-resistant insulating tube of a heater lead wire protective material for short circuit prevention, and inside a heater lead disconnection prevention coil made of a metal wire of a heater lead wire protective material for disconnection prevention. The small electric heater according to claim 1, wherein the small electric heater is inserted and connected to the energization operation unit.

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