A kind of thermocouple preparation and device thereof
(1) technical field
The present invention relates to the manufacture method of thermocouple and implement the device of this method.
(2) background technology
In the prior art, arc welding, argon arc welding, gas welding, carbon dust welding, salt solution welding, mercury welding etc. are extensively adopted in the manufacturing of thermocouple.Many manufacture methods all have weak point, and wherein arc-welding process is prone to the carburizing contamination on the electrode near pad reaches; The cost of equipment costliness that the argon arc welding connection is required, inapplicable common lab is used; Though gas welding is convenient, equipment manufacturing cost is lower, operation is difficult to grasp, and it and carbon dust weld and all easily cause the thermal cross brittle failure; Salt solution welding and mercury welding equipment are simple, cheap, but the salt solution welding has selectivity to electrode material, can not adopt the metal that electrolysis can take place in sodium chloride solution; When water silver soldering connects,, unfavorable to health because there is vapo(u)rability in mercury vapor.
(3) summary of the invention
At the deficiencies in the prior art, the invention provides a kind of thermocouple preparation and device thereof.Its method simple and reliable process, be convenient to the operation, health is not had harm.The device of implementing this method is cheap, and it is wide to adapt to the electrode material scope, can avoid thermocouple defectives such as contamination, brittle failure to occur.
Technical scheme of the present invention realizes as follows: a kind of thermocouple preparation, the steps include: that 1. two kinds of plain conductors will making thermocouple are cut into the suitable line segment of length according to instructions for use, and two leads are closed up, an end is had one's hair trimmed with scissors, as the pre-welding contact; 2. two terminals with the primary coil of voltage regulator connect AC power, connect the non-pre-welding end and the tin membrane electrode of soldered thermocouple respectively at two outputs of the secondary coil of voltage regulator; 3. the tin membrane electrode places in the container that non-easy fuel oil is housed; 4. energized is adjusted the output voltage of voltage regulator; 5. with the pre-welding contact contact tin film of thermocouple, the two kinds of metals in top are melted rapidly, speed away after the starting the arc, form bright bead; 6. take off two metal electrodes of thermocouple from the secondary coil of voltage regulator, finish welding.
According to technique scheme, wherein two leads in the step 1 close up for twisting into twisted shape; The output voltage of voltage regulator is about 80V in the step 4.
Implement the device of this method, it comprises voltage regulator, container, two inputs of the primary coil of voltage regulator connect AC power through switch, its design feature is, two outputs of the secondary coil of voltage regulator connect the non-pre-welding end and the tin membrane electrode of the thermocouple that needs welding respectively, and the tin membrane electrode immerses and is equipped with in the container of non-easy fuel oil.
According to above-mentioned technical scheme, the tin membrane electrode is to be made of the metal framework of conductive metallic material making and the tinfoil film that closely is attached on the metal framework, and an end of the secondary coil output of voltage regulator is connected with metal framework.
The present invention makes that the thermocouple welding equipment is simple in structure owing to adopted above-mentioned method and implemented the device of this method, and is cheap.Because the thermocouple welding is to carry out in having the container of non-easy fuel oil, therefore avoided thermocouple defectives such as contamination, brittle failure to occur again.Have simple to operate, the characteristics of good reliability.The thermocouple high conformity of making, and smooth surface have metallic luster, its precision reaches ± and 0.1 ℃, can be used as the secondary standard thermometer and use, be applicable to that the galvanic couple wire diameter is the cheap metal thermocouple making of 0.03mm to 0.5mm, has the value of extensively promoting the use of.
(4) description of drawings
Below in conjunction with the drawings and the specific embodiments the present invention is described in further detail.
Fig. 1 is a structure connection layout of the present invention;
Fig. 2 is tin film electrode structure figure of the present invention;
Fig. 3 is prewelding thermocouple shape figure of the present invention;
Fig. 4 contacts the direction schematic diagram for prewelding thermocouple of the present invention with the tin membrane electrode;
The thermocouple shape figure of Fig. 5 for using the present invention's welding to finish.
(5) embodiment
A kind of preparation method of thermocouple the steps include: that 1. two kinds of plain conductors will making thermocouple are cut into the suitable line segment of length according to instructions for use, and two leads are closed up twists into twisted shape, and an end is had one's hair trimmed with scissors, as the pre-welding contact, as shown in Figure 3.2. two terminals with the primary coil of voltage regulator connect AC power, connect the non-pre-welding end and the tin membrane electrode of soldered thermocouple respectively at two outputs of the secondary coil of voltage regulator.3. the tin membrane electrode is placed in the container that non-easy fuel oil is housed.4. energized, the output voltage of adjusting voltage regulator is about 80V.5. with the pre-welding contact contact tin film of thermocouple, the two kinds of metals in top are melted rapidly, speed away after the starting the arc, form bright bead.6. take off two metal electrodes of thermocouple from the secondary coil of voltage regulator, finish welding, as shown in Figure 5.
Referring to Fig. 1 and Fig. 2, implement the device of thermocouple preparation, comprise voltage regulator 1 and the container 3 of non-easy fuel oil be housed that two inputs of the primary coil of voltage regulator 1 connect AC power by mains switch 5.Two outputs of the secondary coil of voltage regulator 1 connect the non-pre-welding end of the thermocouple 2 that needs welding respectively and put into the tin membrane electrode 4 of container 3, and tin membrane electrode 4 is to be made of conductive metallic material metal framework of making 6 and the tinfoil film 7 that is attached on the metal framework 6.One end of the secondary coil output of voltage regulator 1 is connected with metal framework 6.
The use of this device, except that method according to the invention described above, should be with tin membrane electrode 4 horizontal positioned that place in the container 3, but it is fixing by the frock jig of the non-weldering end of welding heat galvanic couple 2 to make the removable mounting that joins with voltage regulator 1 secondary coil output, make the prewelding contact of thermocouple 2 and the plane of tin membrane electrode 4 keep vertical direction, as shown in Figure 4.Be beneficial to realize the mass production of thermocouple.What be worth proposition is no matter which kind of shape is the external form of thermocouple be, as long as can adopt method of the present invention and device thereof to produce, all to belong to protection scope of the present invention.