CN107552946A - A kind of universal mold for grounded screen aluminum weld - Google Patents

Abstract

The invention discloses a general mold for aluminothermic welding of grounding grids, which comprises a mold body, inside the mold body from top to bottom are a reaction chamber, a drainage groove, and a welding chamber, the bottom of the reaction chamber is connected with a drainage groove, and the reaction chamber Gaskets, thermite welding powder, and ignition powder can be placed in the room. The welding cavity is horizontally located at the bottom of the drainage groove. The outer surface of the mold body is provided with fixed placement cavities connected to the welding cavity on both sides of the horizontal level. The fixed placement cavities are equipped with detachable The diameter of the module is the same as the inner diameter of the fixed cavity, and the end face of the module has an inner hole through which the required welding conductor can pass. At the same time, the ignition port and the cover used in conjunction with the cover are set on the mold body to reduce the number of workers. Inhale the smoke and dust generated by combustion during ignition. When the present invention is used in the field, only one mold and modules with different inner hole diameters are needed for the conductors of the same specification and different sizes to be welded. .

Description

A general mold for aluminothermic welding of grounding grid

technical field

The invention relates to aluminothermic welding, in particular to a general mold for aluminothermic welding of grounding grids.

Background technique

The grounding device can introduce the leakage current, static charge and lightning current that may be generated on electrical equipment and other production equipment into the ground, so as to avoid personal electric shock and possible fire, explosion and other accidents. It is necessary to ensure the normal operation of electrical equipment and personal safety. An electrical safety measure taken. With the development of the power system, its requirements for grounding devices are becoming more and more stringent. A long-term, reliable and safe grounding system is the fundamental guarantee for maintaining the stable operation of the power system and ensuring the safety of operating personnel and electrical equipment. The key to ensure the long-term safe and reliable operation of the grounding system lies in good quality grounding materials and reliable connections;

At present, the gas welding or arc welding process is generally used for grounding grid connection, but the safety requirements of the welding process are relatively high (for example, oxygen and acetylene cannot be transported in the same vehicle, and the site requires that they should be placed at a distance of more than 5m from each other; arc welding should prevent burning eyes, electric shock, and fire. and other accidents), welding personnel must hold special operation certificates, and the workplace must meet certain safety technologies. Especially in the welding process of grounding grids such as transmission substations and transmission towers, there are often difficulties such as no electricity, complex terrain and inconvenient transportation on the construction site, and the difficulty of gas welding or arc welding construction has increased sharply. Aluminothermic welding is to use the chemical reaction between aluminum and copper oxide, use high temperature in the high temperature resistant graphite mold to reduce the copper oxide to the highly active aluminum, and produce ultra-high heat copper molten metal conductor in the mold, after a certain shape and size The mold cavity to complete the modern welding process of fusion joints. It only needs flux, ignition device and mold to carry out welding, and does not need a large number of auxiliary welding equipment. It is fast and convenient for field environment welding, and is known as the best connection method for grounding devices;

Although aluminothermic welding can weld stranded wire-stranded wire, stranded wire-steel plate, stranded wire-steel pipe, steel plate-steel plate and other joints, its principle determines that joints of different specifications and sizes require special molds. Especially in the field construction, it is necessary to bring a variety of special molds according to different specifications and sizes of joints. The hardness of the graphite mold is not high, and the transportation is extremely inconvenient. The graphite mold that needs to withstand high temperature and hot air flow is expensive, which limits the thermal radiation welding on the ground. Network promotion and application.

Contents of the invention

In order to solve the problem that special molds are required for different joints of thermite welding, the present invention provides a general mold for thermite welding of grounding grids, which can be used for thermite welding of joints of the same specification and different sizes, which improves the convenience of transportation and reduces the cost. It is suitable for stranded wire-stranded wire, stranded wire-steel plate, steel plate-steel plate and other forms of welding.

The present invention is realized through the following technical solutions:

A general-purpose mold for aluminothermic welding of grounding grids, the general-purpose mold includes a mold body, and the inside of the mold body is respectively arranged as a reaction chamber, a drainage groove, and a welding chamber from top to bottom, and the bottom of the reaction chamber A drainage groove is connected, and gaskets, thermite welding powder, and ignition powder are placed in the reaction chamber. The welding cavity is horizontally located at the bottom of the drainage groove, and the horizontal sides of the outer surface of the mold body are respectively provided with fixing parts that communicate with the welding cavity. The placement cavity, the fixed placement cavity is provided with a detachable module, the diameter of the module is the same as the inner diameter of the fixed placement cavity, and the end surface of the module is pierced with an inner hole through which the required welding conductor can pass.

Preferably, the mold body is provided with an ignition port near the top, and the ignition port communicates with the reaction chamber through an inclined pipe sprinkled with ignition powder in advance, and the top of the mold body is hinged on the side opposite to the ignition port. A cover body, the side of the cover body above the ignition port is slidably connected with a shutter for blocking the ignition port through a sliding slot.

Preferably, a fire baffle is detachably provided on the side wall above the end of the inclined pipe in the reaction chamber, and the end of the fire baffle away from the ignition port leaves a gap with the reaction chamber to form a smoke exhaust channel.

Preferably, the cover is provided with a smoke outlet, and the smoke outlet is located on the side of the cover away from the ignition port.

Preferably, the bottom end of the shutter is connected with a protrusion matching the ignition port.

Preferably, a handle is provided on the shutter.

Preferably, the module is made of graphite.

Preferably, the reaction chamber has a wide top and a narrow bottom.

Aiming at the problem that special molds are required for different joints of aluminothermic welding, the beneficial effects of the present invention mainly include the following aspects:

(1) The horizontal sides of the outer surface of the mold body of the present invention are respectively provided with fixed placement cavities communicating with the welding cavity, and detachable modules are arranged in the fixed placement cavities, the diameter of the modules is the same as the inner diameter of the fixed placement cavity, and the end faces of the modules There is an inner hole through which the required welding conductor can pass. In field construction, only one mold and modules with different inner hole diameters are needed for the same specification (round, square) and different sizes of welded conductors. Welding conductors to be welded with the same specifications and different sizes improves the convenience of transportation and saves the cost of mold making. Although the welding of small-sized joints with large molds (molds for large-sized joints) requires more solder powder, it is not compatible with molds. Compared with the high cost and the convenience of transportation, it can still greatly reduce the connection cost of the aluminothermic welding of the grounding grid;

(2) Commonly used thermite welding ignition is to bend the ignition strip, put it on the thermite welding powder in the reaction chamber, and then cover the mold cover. One end of the ignition strip leaks out of the mold cover to facilitate ignition, but During use, sometimes the ignition strip is easily broken by the cover body, which affects the ignition efficiency. In the present invention, an ignition port is provided on the side of the mold body near the top, and the ignition port communicates with the reaction chamber through an inclined pipe sprinkled with ignition powder in advance. The top of the mold body is hinged with a cover on the side opposite to the ignition port, and the side of the cover above the ignition port is slidably connected with a shutter for blocking the ignition port through a chute. Slide the plate onto the cover, place the ignition gun on the ignition port, and react with the thermite powder and ignition powder in the reaction chamber by igniting the ignition powder on the inclined pipe;

(3) In the present invention, a fire baffle is detachably arranged on the side wall above the end of the inclined pipe in the reaction chamber, and the end of the fire baffle far away from the ignition port leaves a gap with the reaction chamber to form a smoke exhaust channel. The setting of the fire baffle makes the combustion inside the reaction chamber more complete, and the shutter slides down from the cover to block the ignition port immediately after ignition, while the burning smoke is discharged from the exhaust channel far away from the ignition port and the exhaust on the cover. The smoke port is discharged, so that the staff who are located near the ignition port can reduce the inhalation of the smoke generated by the combustion when they ignite.

Description of drawings

Fig. 1 is the whole sectional schematic diagram of mold of the present invention;

Fig. 2 is the structural representation of the module of the present invention;

Fig. 3 is a schematic structural view of the cover body of the present invention;

Reference signs: 1. Mold body, 2. Reaction chamber, 3. Drainage groove, 4. Welding cavity, 5. Protrusion, 6. Fixed placement cavity, 7. Module, 8. Inner hole, 9. Fire baffle , 10, ignition port, 11, inclined pipe, 12, cover, 13, shroud, 14, chute.

detailed description

The present invention will be further described below in conjunction with specific embodiment:

Example 1

A general-purpose mold for aluminothermic welding of grounding grids, the general-purpose mold includes a mold body 1, and the inside of the mold body 1 is respectively arranged as a reaction chamber 2, a drainage groove 3, and a welding chamber 4 from top to bottom. The reaction chamber 2 is a structure with a wide top and a narrow bottom. The bottom of the reaction chamber 2 is connected with a drainage groove 3. A gasket is placed between the reaction chamber 2 and the drainage groove 3. A thermite can be placed above the gasket. Welding powder, ignition powder, the gasket can be an aluminum gasket, the fusion cavity 4 is horizontally located at the bottom of the drainage groove 3, and the horizontal sides of the outer surface of the mold body 1 are respectively provided with fixed placement cavities communicating with the fusion cavity 4 6. The fixed placement cavity 6 is provided with a detachable module 7, the module 7 is made of graphite, the diameter of the module 7 is the same as the inner diameter of the fixed placement cavity 6, and the end surface of the module 7 runs through The inner hole 8 through which the required welding conductor can pass, the module 7 can be replaced with a module with a different inner hole 8 aperture, which is used for welding the same specification and different sizes of the required welding conductor;

The mold body 1 is provided with an ignition port 10 near the top side, and the ignition port 10 communicates with the reaction chamber 2 through an inclined pipe 11 sprinkled with ignition powder in advance. The top of the mold body 1 is opposite to the ignition port 10. One side is hinged with a cover body 12, and the side above the ignition port 10 on the cover body 12 is slidably connected with a shutter 13 for blocking the ignition port 10 through a chute 14, and the bottom end of the shutter 13 is connected with a The protrusion 5 matched with the ignition port 10, and the shutter 13 is provided with a handle, and the side wall above the end of the inclined pipe 11 in the reaction chamber 2 is detachably provided with a fire baffle 9, the described There is a gap between the end of the fire baffle plate 9 away from the ignition port 10 and the reaction chamber 2 to form a smoke exhaust channel. The cover 12 is provided with a smoke exhaust port, and the smoke exhaust port is located on the side of the cover body 12 away from the ignition port. .

work process:

The general-purpose mold of the present invention is assembled from left and right parts, and assembled by screws passing through the screw holes on the mold body 1. Before thermite welding, the mold body 1 and the conductor to be welded should be dehumidified to ensure dryness. Wear gloves and For protective equipment such as goggles, select modules with corresponding inner hole diameters according to the inner diameter of the conductor to be welded, for example: for Φ20mm-Φ20mm steel strand "one" joint welding, select two modules with inner hole diameters of Φ20mm, and install them In the fixed cavity 6 of the mold body, pass the Φ20mm steel strand connector through the inner hole of the module 7, and assemble it with the module 7, ensure that the welding part is located in the center of the welding cavity 4, and put the gasket into the bottom of the reaction chamber 2 Finally, put the thermite powder and ignition powder into the gasket to prevent the thermite powder and ignition powder from entering the fusion chamber 4 through the drainage groove 3 before the reaction, and then sprinkle some ignition powder on the inclined pipe 11 in advance, and cover it body 12, when ignition is required, slide the shutter 13 onto the cover body 12, place the ignition gun on the ignition port 10, and ignite the ignition powder on the inclined pipe 11 to ignite the thermite powder in the reaction chamber 2 , fire powder reaction, high temperature is generated to melt the gasket, and the conductor needs to be welded through the drainage groove 3 into the fusion chamber 4 for welding. The setting of the fire baffle plate 9 in the reaction chamber 2 makes the internal combustion of the reaction chamber 2 more complete and ignites At the last moment, the shutter 13 slides down from the cover 12 to block the ignition port, and the smoke and dust burned are discharged from the smoke exhaust channel far away from the ignition port 10 and the smoke exhaust port on the cover 12, so that the working near the ignition port 10 When personnel ignite, reduce the inhalation of smoke generated by combustion. After the reaction is over for 2 to 3 minutes, open the mold after cooling, take out the welded joints, and complete the welding of the "one" joints of Φ20mm-Φ20mm steel strands. The module is made of graphite. , is a one-time product, it can be broken and removed after welding, or it can be left on the welded conductor joint, without affecting the conductivity of the joint, clearing the slag in the mold, so that it can be used next time, when it is necessary to weld other sizes of conductors to be welded , only need to replace the module that matches the conductor to be welded, and repeat the above operations to realize the welding of conductors to be welded with the same specification and different sizes in one mold, which improves the convenience of transportation and saves the cost of mold production. Wire-stranded wire, stranded wire-steel plate, steel plate-steel plate and other forms of welding.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and description are only to illustrate the principles of the present invention. Under the premise of not departing from the spirit and scope of the present invention, the present invention also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed invention. Its equivalents are defined.

Claims (8)

1. A kind of 1. universal mold for grounded screen aluminum weld, it is characterised in that：The universal mold includes die ontology （1）, the die ontology（1）Reaction chamber is inside respectively set to from top to bottom（2）, drainage trough（3）, welding chamber（4）, it is described anti- Answer chamber（2）Bottom be connected with drainage trough（3）, the reaction chamber（2）Inside it is placed with pad, aluminothermy welding powder, pyrophoric powder, institute State welding chamber（4）It is positioned horizontally in drainage trough（3）Bottom, die ontology（1）The horizontal both sides in outer surface be respectively arranged with connection Welding chamber（4）Fixed placement chamber（6）, the fixed placement chamber（6）Inside it is provided with dismountable module（7）, the module （7）Diameter and fixed placement chamber（6）Internal diameter it is identical, the module（7）End face on through have can supply and demand welding conductors wear The endoporus crossed（8）.
2. A kind of 2. universal mold for grounded screen aluminum weld according to claim 1, it is characterised in that：The mould Body（1）Top side is provided with lighting-up tuyere（10）, the lighting-up tuyere（10）By the tipping tube for being sprinkled with pyrophoric powder in advance Road（11）With reaction chamber（2）Connection, the die ontology（1）Top on lighting-up tuyere（10）Relative side is hinged with lid Body（12）, described lid（12）It is upper to be located at lighting-up tuyere（10）The side of top passes through chute（14）Slidably connect for blocking Lighting-up tuyere（10）Shield（13）.
3. A kind of 3. universal mold for grounded screen aluminum weld according to claim 2, it is characterised in that：Described is anti- Answer chamber（2）It is interior to be located at tilted tube（11）Fireguard is detachably provided with side wall above end（9）, described fireguard （9）Away from lighting-up tuyere（10）One end and reaction chamber（2）Leave gap and form discharge flue.
4. A kind of 4. universal mold for grounded screen aluminum weld according to claim 2, it is characterised in that：The lid （12）Exhaust opening is provided with, the exhaust opening is located on lid away from lighting-up tuyere side.
5. A kind of 5. universal mold for grounded screen aluminum weld according to claim 2, it is characterised in that：The shield （13）Bottom be connected with and lighting-up tuyere（10）The projection to match（5）.
6. A kind of 6. universal mold for grounded screen aluminum weld according to claim 2 or 5, it is characterised in that：It is described Shield（13）It is provided with handle.
7. A kind of 7. universal mold for grounded screen aluminum weld according to claim 1, it is characterised in that：The module （7）For graphite material.
8. A kind of 8. universal mold for grounded screen aluminum weld according to claim 1, it is characterised in that：The reaction Chamber（2）For structure wide at the top and narrow at the bottom.