SU1368142A1 - Table for welding - Google Patents

Abstract

The invention relates to welding equipment, namely, to tables for the production of welding with the ventilation system of the welder's breathing zone. The aim of the invention is to reduce energy costs by reducing the flow of air for ventilation and improving the working conditions of the welder. When the arc ignites, the welding current sensor 6 through the switching device I1, equipped with a shutdown delay unit 12, automatically turns on the ventilation system by turning on the fan drive or the valve drive. After the end of welding or at short breaks in the arc, the ventilation system continues to operate for another 5 ... 20 seconds, ensuring the suction of the residual harmful bodies at the end of welding. Energy costs are reduced, the volumes of suction air are reduced, and working conditions are improved. 2 hp f-ly, 5 ill. § cl

Description

The invention relates to welding equipment, namely, to tables for the production of welding with the ventilation system of the welder's breathing zone.

The aim of the invention is to reduce energy costs by reducing the volume of air pumped by ventilation and improving the working conditions of the welder.

FIG. 1 shows a general B1 of the welding table with an exhaust ventilation unit; in fig. 2 - a general view of the table with the inlet ventilation unit; Fig. 3 is a general view of a table connected to a workshop injection ventilation system; in fig. 4 - air flow flap

in the closed position; in fig. 5 - air flow flap in the open position.

The welding table contains a housing 1 with a working grille 2 and a ventilation panel 3. A welding cable 4 is connected to the table by means of a clamp 5. A welding current sensor 6 is connected to the welding cable. The power supply of the table electric equipment is carried out from the network 7.

For a welding table with an autonomous exhaust system (Fig. I), a ventilation unit with an electric motor 8 and a fan 9 is installed in the housing 1 so that the entrance of the fan 9 is connected to the cavities of the table, from which air is sucked out and

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connected to the shop pressure pipeline 10.

The motor 8 is connected to the mains 7 through the switching device 11 with normally open contacts. The switching device 11 is connected to the unit with a shutdown delay 12, which is made, for example, in the form of a time relay and is equipped with a time delay regulator 13.

For the Welding table with an autonomous supply system (Fig. 2), a ventilation unit with an electric motor 5 and a fan 15 is installed in the housing 1 so that the inlet of the fan 15 is connected to the clean air intake device 16 and the outlet is connected to an internal cavity supply, ventilation panel 3. The electric motor 14 is connected to the mains 7 via the switching device 1I. From the cavity of the increased pressure of the ventilation panel 3, a branch pipe 17 is removed with a valve 18, to which, if necessary, a hose can be connected to force fresh air under the mask of the welder.

The dd of the welding table connected to the shop injection ventilation system (Fig. 3.) in the housing. I a window 19 is made with a flange 20 for connection to the shop-side injection pipeline of clean air 21.

The window 19 is closed by a gate 22 which is installed on the axis 23 and is connected to the electromagnet 24 by means of the lever 25. The electromagnet 24 is connected to the supply network 7 via a switching device 11 connected to the shutdown delay unit 12, equipped with a duration control H of Hold 13.

The gate 22 is mounted on the axis 23 in such a way that its rotation when the window is closed takes place in the direction of the air flow. A seal 27 is attached to the outer edge 26 of the shutter 22, and a spring 28 is attached to the lever 25. A branch pipe 17 with a valve 18 is inserted from the cavity of the table with increased supply air pressure, to which, if necessary, a spring can be connected to forcibly supply clean air under the mask of the welder.

 The table is operated as follows.

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Before welding, depending on the brand and diameter of the electrode, welding mode, etc. setting the delay controller 13 sets the required delay time for switching off the fan motor with an autonomous ventilation system or an electromagnet when using a shop injection ventilation system.

At the time of ignition, the arc welding current sensor 6 gives a signal to the switching device 1I, which turns on the electric motor of the fan or the electromagnet of the flap.

In this case (Fig. 1), the fan 9 creates discharge in the cavity of the table and sucks the polluted air from the welder’s breathing zone through the working grid 2. Contaminated air is supplied to conduit 10, which is removed from the production area.

When the electric motor 14 (Fig. 2) is turned on, the fan 15 supplies clean air from the intake device 16 to the ventilation panel 3, and from there air enters the breathing zone of the welder.

When the electromagnet 24 is on (Fig. 3). the levers 25 rotate the slider 22, connecting the table ventilation system to the shop-line clean air supply pipe 21, which ensures the supply of clean air through the ventilation panel 3 to the welder's breathing zone.

After the end of welding or at occasional short breaks in the arc, the signal from sensor 6 disappears. However, the shutdown of the fan motor or the electromagnet of the valve does not occur for another 5-20 seconds, which ensures the suction of harmful residues after the end of welding. The shutdown delay is provided by the shutdown delay unit 12. After 5–20 seconds, depending on the setting of the regulator 13, the ventilation system automatically shuts off.

The use of the invention allows to automatically provide ventilation in the weld zone only during the arc and during the period of time necessary to remove residual hazards after welding.

In this case, short-term interruptions of the arc do not affect the operation of the ventilation system.

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Claims (3)

Claim 1. Welding table, comprising a housing with a ventilation system equipped with a drive, characterized in that, in order to reduce energy costs by reducing air flow for ventilation and improve working conditions, the table is equipped with a welding current sensor and a switching device with a stop-delay unit ventilation system. 2. Table for welding according to π. I, characterized in that the switching device with the trip delay unit is connected to the drive of the ventilation system. 3. Welding table 1 and 2, characterized in that the ventilation system is equipped with an air flow shutter with a drive for its fixed rotation, and a switching device with a shutdown delay unit is connected to the zablotsky drive. * | 12 s Figure 1 13681 42