A kind of manufacturing process of vacuum cartridge fuse
Technical field:
The present invention relates to cartridge fuse and manufacturing technology field thereof, particularly a kind of manufacturing process of vacuum cartridge fuse.
Background technology:
Existing cartridge fuse, because the restriction of design and welding procedure is not a vacuum in the body of the good back of welding, the inside is full of air usually.The fuse product generally is used in the charged circuit, under long-term power on condition, itself can produce temperature, and fuse is under this temperature conditions, if be on every side in the environment that air is arranged, because effects such as its airborne moisture content and oxygen can be corroded this fuse, thereby can influence the life-span of this product.In addition, cartridge fuse produces big heat when fusing, surrounding medium is expanded, the danger of therefore blasting easily; And, when working, product can produce heat in circuit, and heat has following several mode to transmit usually: the A. thermal radiation: to external radiation, partly ratio is less for this by forms such as infrared rays for the heat that produces on the fuse; B. heat conduction: the heat that produces on the fuse in such cases, mainly is by air and outwards heat conduction of fuse itself by the outside heat conduction of media.On the electrical characteristic of product, according to standard, product requirement has certain area requirement at the current test point of different multiples to its fusing time, and is inhomogeneous and easily lost owing to heat in the antivacuum cartridge fuse, so the consistency of fusing time is relatively poor.
On the other hand, existing fuse solder technology adopts following several welding manners usually, and as heat block welding, blowing hot wind welding, electric current weldering welding, flare welding etc., it mainly is to make tin fusing back cooling reach welding effect by heating.Existing fuse welding procedure mainly has the following disadvantages: the surrounding enviroment temperature is higher when 1, welding, and causes the welder to scald easily; 2, meeting produces bad airs such as smog, contaminated environment in the welding process; 3, the easy defective phenomenons such as tin, askew cap of emitting of expansion appear in gas in the welding process; 4, also be easy to generate the scratch of copper cap, rosin joint, fall substandard products such as cap; 5, not high, power consumption consuming time of welding efficiency etc.
Chinese patent application 02134292.X discloses a kind of cartridge fuse and manufacture method thereof, it mainly realizes the fixedly welding of fuse by molten glass, but its operating procedure is very complicated, and the temperature requirement of molten glass is higher, a large amount of heat dissipations waste in air, do not meet requirements of saving energy, and can only be at some special product.
Moreover the high-frequency welding technology is utilized the kelvin effect and the proximity effect of high-frequency current, makes the top layer metal Fast Heating at weldment place to be welded and realizes welding at other field ripe application having been arranged.
Summary of the invention:
The objective of the invention is to solve the above-mentioned weak point of existing cartridge fuse, a kind of manufacturing process---the high-frequency induction welding technique and concrete operations step thereof of vacuum cartridge fuse of vacuum cartridge fuse is provided at aspects such as performance, life-spans.
Vacuum cartridge fuse of the present invention comprises the copper cap at the body that is welded on one, two ends and is inner and be connected in fuse between the copper cap of two ends at body that its manufacturing process comprises the steps:
A. body is inserted positioning fixture;
B. fuse is fixed in the body;
C. be inserted in the copper cap of first-class tin at body one end;
But the body that D. will package the copper cap is put into the airtight welding cavity volume of the folding of high-frequency welder together with positioning fixture;
E. opened high-frequency welder 1 second~5 seconds, the copper cap of good this end of welding;
F. take out positioning fixture after cooling, put the copper cap of first-class tin at the body other end;
But G. again body is inserted the airtight welding cavity volume of the folding of high-frequency welder together with positioning fixture, then airtight welding cavity volume is vacuumized, opened high-frequency welder at last 1 second~5 seconds, finish welding.
The present invention mainly utilizes the high-frequency welding principle that the copper cap of fuse, body, first-class tin is welded as a whole, promptly produce high-frequency current by high-frequency welder, but the airtight welding cavity volume of a folding is set, high-frequency current produces alternating magnetic field in airtight welding cavity volume, the frequency and the time of control high-frequency current, make the fusing of the tin on the copper cap in the airtight welding cavity volume and the realization welding.The frequency range of high-frequency current is about 10KHz~450KHz, and frequency is high more, takes short more.
Utilize the high-frequency welding principle copper cap of welding one end earlier, when the welding other end, will weld cavity volume and be evacuated to reach the purpose that the finished product cartridge fuse is a vacuum state.
Wherein, can be earlier among the described step B place in the body fuse is oblique, and make the fuse two ends expose to the body outside; The two ends that to expose bend laterally along the body end face then, are about to fuse and are bent into " Z " font.
Perhaps, described step B, C can merge and finish, and promptly earlier fuse uprightly are fixed on the copper cap, then with the end of copper cap sleeve at body, can make fuse the mode of center line welding like this.
Be provided with the compressing head of compressible copper cap in the airtight welding cavity volume among the described step D.
Described compressing head is a clava, and this clava produces pressure by the spring that is fixed in the airtight welding cavity volume to the copper cap.The size of its elastic force is by the speciality decision of spring.
Airtight welding cavity volume in the described step e is provided with circulating cooling system, and it is the circulating water pipe that is looped around airtight welding cavity volume periphery.Help rapid heat radiation, be convenient to take out positioning fixture and enter next step, therefore can enhance productivity and fail safe.
Described positioning fixture is rounded, and edge evenly forms a plurality of location divisions, can weld a plurality of cartridge fuses simultaneously, enhances productivity.
Vacuum cartridge fuse major advantage of the present invention is:
1. life-span preferably: the fuse product generally is used in the charged circuit, under long-term power on condition, itself can produce temperature, and fuse is under this temperature conditions, if be on every side in the environment that air is arranged, because effects such as its airborne moisture content and oxygen can be corroded this fuse, thereby can influence the life-span of this product.And if be in the environment of vacuum, this problem has good improvement, can prolong the life-span of product;
2. the capability of antidetonance: A. is because be vacuum in the pipe preferably, and fuse is blowing the generation time that moment can shorten electric arc, thereby the continuation that reduces circuit energy produces, thereby has improved the antiknock rating of product; (vacuum extinction); B. because be vacuum in the pipe,, lack the media that transmits energy, thereby can not produce bigger expansive force, thereby its body and copper cap also can improve antiknock rating accordingly peripheral thing though fuse the time can produce higher energy in fusing;
3. lower product temperature rise: because be vacuum, just reduced a kind of heat conduction media, thereby the heat that reaches above the body can reduce accordingly, thereby Comparatively speaking the temperature rise of product can hang down, thereby can reach the instructions for use of product preferably;
4. electrical characteristic preferably: thereby because be the principal element that vacuum has reduced heat dissipation, thereby the heat that product produces in circuit can better accumulate in the central point of fuse, and the time consistency that reaches fusing energy can be better, more stable, promptly the fusing time consistency of product can be better.
The major advantage of vacuum cartridge fuse manufacturing process of the present invention is: 1. this is a kind of a kind of welding manner novel in the fuse industry, can replace original several welding manners, as the heat block welding, and blowing hot wind welding, electric current weldering welding, flare welding etc.; 2. fail safe is better, can not cause operative employee's accidents such as scald; 3. surrounding enviroment are better, can not produce hot environment; 4. can not cause bad airs such as smog when producing; 5. speed of welding is fast, can weld in 1 to 3 second, and can weld tens simultaneously, the efficient height; 6. energy waste is few, and energy utilization rate is more than 90%; 7. can solve and weld an industry difficult problem of being run in the fuse industry, as emit tin, askew cap, the scratch of copper cap, rosin joint, fall cap etc., more apparent advantage in no lead welding.
Description of drawings:
Fig. 1 is a vacuum fuse manufacturing process operating procedure block diagram of the present invention;
Fig. 2, Fig. 3, Fig. 4 are the schematic diagrames of part operation step of the present invention.
Embodiment:
Cartridge fuse of the present invention comprises the copper cap 3 at the body 2 that is welded on one, two ends and inner and be connected in fuse 1 between the copper cap of two ends at body 2, and wherein: body 2 inside of described cartridge fuse are vacuum state.
As shown in Figure 1, the manufacturing process of cartridge fuse of the present invention mainly comprises the steps:
A. body is inserted positioning fixture;
B. fuse is fixed in the body;
C. be inserted in the copper cap of first-class tin at body one end;
But the body that D. will package the copper cap is put into the airtight welding cavity volume of the folding of high-frequency welder together with positioning fixture;
E. opened high-frequency welder 1 second~5 seconds, the copper cap of good this end of welding;
F. take out positioning fixture after cooling, put the copper cap of first-class tin at the body other end;
But G. again body is inserted the airtight welding cavity volume of the folding of high-frequency welder together with positioning fixture, then airtight welding cavity volume is vacuumized, opened high-frequency welder at last 1 second~5 seconds, finish welding.
Welding procedure of the present invention adopts high-frequency induction welding technique, promptly utilize the high-frequency welding principle that the copper cap of fuse, body, first-class tin is welded as a whole, produce high-frequency current by high-frequency welder, but the airtight welding cavity volume 5 of a folding is set, as shown in Figure 4, high-frequency current coil 6 is wrapped in airtight welding cavity volume 5 peripheries, makes in the airtight welding cavity volume 5 and produces alternating magnetic field, the frequency and the time of control high-frequency current, make the tin fusing on the copper cap in the airtight welding cavity volume 5 and the realization welding.Airtight welding cavity volume 5 is provided with the interface 50 that is connected with air-extractor.Be provided with the compressing head 7 of compressible copper cap in the airtight welding cavity volume 6.Described compressing head 7 is a clava, and this clava produces pressure by the 8 pairs of copper caps of spring that are fixed in the airtight welding cavity volume.Airtight welding cavity volume 5 peripheries are provided with circulating cooling system, and it is the circulating water pipe that is looped around airtight welding cavity volume periphery.
Embodiment one:
In conjunction with schematic diagram 2,4, at first, carry out the steps A (not shown), body 2 is fixed on positioning fixture 4, first among the described step B in the present embodiment with fuse 1 oblique placing in the body 2, and make fuse 1 two ends expose to body 2 outsides; The two ends that to expose bend laterally along body 2 end faces then, are about to fuse 1 and are bent into " Z " font.Put the copper cap 3 of first-class tin then at body one end, but the body 3 that packages copper cap 3 is put into the airtight welding cavity volume 5 of the folding of high-frequency welder together with positioning fixture 4, open high-frequency welder 1~5s, the copper cap of good this end of welding; Take out positioning fixture 4, put the copper cap at body 2 other ends, put into airtight welding cavity volume 5 more together, and airtight welding cavity volume 5 is utilized the air-extractor state that is evacuated, opened high-frequency welder then 1 second~5 seconds, the welding taking-up of finishing other end copper cap gets final product.
Embodiment two
In conjunction with schematic diagram 3,4, at first, carry out the steps A (not shown), body 2 is fixed on positioning fixture 4, in the present embodiment, step B, C merge, promptly in advance fuse 1 vertically is fixed on the copper cap 3 by tin, also copper cap 3 has been enclosed within on the body 2 when then fuse being passed body 2, but the body 3 that packages copper cap 3 has been put into the airtight welding cavity volume 5 of the folding of high-frequency welder together with positioning fixture 4, open high-frequency welder 1~5s, the copper cap of good this end of welding; After the taking-up, and then put another copper cap, put into airtight welding cavity volume once more, and airtight welding cavity volume 5 is utilized the air-extractor state that is evacuated, opened high-frequency welder then 1 second~5 seconds, the welding of finishing other end copper cap is taken out and is got final product.