JPH06142946A - Cooling tower and cooling method for spot welding machine - Google Patents

Abstract

PURPOSE:To save cooling water and to improve a cooling effect at the time of cooling a spot welding machine. CONSTITUTION:To a feed water tube 14a in which a pump P is interposed and a return water tube 14b to which nozzles 13, 13,... are attached, a spot welding machine 20 is connected through flexible tubes 30a, 30b so as to be freely attachable and detachable. When the pump P is driven, cooling water stored in a bottom part of a cooling tower 10 is forcedly fed to the inside of the spot welding machine 20 from the feed water tube 14a, and thereafter, passes through the return water tube 14b and is sprayed from the nozzles 13, 13, ..., and comes to circulate. On the other hand, when an air blower 15 provided in the upper part of the cooling tower 10 is driven, an air flow going to the air blower 15 is generated from a louver 11, the cooling water R sprayed from the nozzles 13, 13,... comes into contact therewith and the spot welding machine is cooled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cooling of a spot welding machine used for joining two base materials,
In particular, the present invention relates to a cooling tower for a spot welding machine, which achieves remarkable cooling effect and water saving effect, and a cooling method thereof.

[0002]

2. Description of the Related Art Conventionally, when spot welding is carried out, in order to prevent overheating of the spot welding machine, there has been adopted means for cooling the water by passing water inside thereof.

For example, as shown in FIG. 3, one means is to feed the water in the water storage tank 1 to the spot welding machine 2 and drain the heat-absorbed water as it is.

On the other hand, a means is known in which the water sent to the spot welding machine is returned to the water storage tank and is circulated to use the water.

The spot welding machine 2 has a pair of electrodes 2a, 2a facing each other, arms 2b, 2b for holding the electrodes 2a, 2a, and a transformer 2c, and the inside thereof is for cooling. A pipe is provided and is cooled by the water flowing in the pipe.

[0006]

However, the conventional cooling means for the spot welding machine has the following drawbacks.

In other words, according to the former method, since the cold water is constantly fed to the spot welding machine, a required cooling effect can be obtained, but the water is drained without being reused. Therefore, there is a drawback that it wastes water.

In particular, the amount of water used is 2 liters per minute or more, and if the usage rate of the spot welding machine is high, the water usage fee cannot be ignored.

On the other hand, according to the latter means, it is possible to obtain the water saving effect because the water is circulated and used, but since the water temperature gradually rises, the cooling effect of the spot welding machine is lowered and the electrode is reduced. There is a risk that the expensive transformer may be damaged due to overheating in some cases.

Further, if the capacity of the water storage tank is increased in order to suppress the rise in water temperature, the equipment becomes large and the cost becomes high.

By the way, conventionally known cooling towers are generally used for air conditioning, and have never been used for cooling a spot welding machine, and they have been used as they are for cooling a spot welding machine. In this case, the cooling water cannot be circulated because the pipe resistance of the pipe in the spot welder is large, and the cooling water jetted into the tower is only jetted from the jet port opened in the pipe, which causes heat generation. It was not possible to obtain enough cooling water to cool the spot welder.

[0012]

The present invention relates to a cooling tower in which an air flow is generated in a tower by a blower and cooling water circulating in the air flow is directly contacted to recool the cooling water. A flexible pipe via a spot welder can be detachably connected to a pipe for circulating the cooling water of the cooling tower, and a pump capable of circulating 1 liter or more of cooling water per minute is interposed in the pipe. The above problem is achieved by providing a cooling tower for a spot welding machine, characterized in that the cooling water is sprayed in a mist form by a nozzle provided in the upper part of the tower and brought into contact with the air flow. It is a thing.

Further, according to the present invention, an air flow is generated in the tower by a blower, and cooling water sprayed from a nozzle is brought into direct contact with the air flow to cool it, and the cooling water is further pumped to a spot welding machine via a pump. The above-described problem is achieved by providing a cooling method for a spot welding machine, which is characterized in that the cooling water that has been pressure-fed is sprayed from the nozzle and then recooled after passing through the inside of the spot welding machine. To do.

[0014]

As shown in FIG. 1, when the blower 15 is driven,
An air flow from the louver 11 to the blower 15 is generated inside the cooling tower 10.

On the other hand, when the pump P is driven, the cooling tower 10
The cooling water R stored at the bottom of the check valve 17 is sucked from the check valve 17, and is pressure-fed to the spot welding machine 20 through the water supply pipe 14a and the flexible pipe 30a.

The cooling water R sent to the spot welding machine 20 passes through the copper pipe 27 arranged inside the spot welding machine 20, is sent from the flexible pipe 30b to the return water pipe 14b, and the nozzles 13, 13 are provided. , And is cooled by the air flow, and then stored and circulated at the bottom of the cooling tower 10.

It should be noted that the cooling water R passes through the inside of the spot welding machine 20 to cause heat exchange, and the cooling water R heated thereby is sent to the spot welding machine 20 after being cooled again in the cooling tower 10. Therefore, the spot welder 20 does not overheat.

[0018]

Embodiments of a cooling tower for a spot welding machine and a cooling method for a spot welding machine according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a system diagram for explaining a cooling method of a cooling tower and a spot welder, and FIG. 2 is an enlarged view showing a connecting portion between a pipe of the cooling tower and a flexible tube of the spot welder.

A feature of the cooling tower for a spot welding machine according to the present invention is that the flexible pipe 30a via the spot welding machine 20 is connected to the pipe 14 for circulating the cooling water R of the cooling tower 10.
30b is detachably connectable, a pump P capable of circulating 1 liter or more of cooling water R per minute is interposed in the pipe 14, and the cooling water R is provided at a nozzle 13 provided at an upper portion of the cooling tower 10. It is configured so as to be ejected in the form of mist by 13 and so as to come into contact with the air flow.

Further, the feature of the cooling method of the spot welding machine according to the present invention is that the tower 10 is operated by the blower 15.
An air flow is generated inside the nozzles 1, 1
Cooling water R sprayed from 3, ... is brought into direct contact to cool the cooling water R, and the cooling water R is pumped to the spot welding machine 20 by a pump P.
And the pressure-fed cooling water R after passing through the inside of the spot welding machine 20.
It is in the place where it was sprayed from and recooled.

The cooling tower 10 has a width of 50 cm and a width of 5
It is a hollow can with a height of 0 cm and a height of 150 cm.
Opposing side surfaces are opened, and inclined plates 12, 12, ...
The louver 11 is formed by arranging a plurality of ... And the blower 15 is fixedly installed on the upper surface.

The pipe 14 of the cooling tower 10 has a water supply pipe 14a extending outward from the bottom of the cooling tower 10 where the cooling water R is stored, and a return water pipe 14b penetrating above the cooling tower 10. In particular, a pump p (vortex pump) is interposed in the water supply pipe 14a, and a check valve 17 is attached to the tip thereof, and the nozzle is provided in the return water pipe 14b located inside the cooling tower 10. 13, 13,
... is attached.

Further, an eliminator 16 is interposed between the nozzles 13, 13, ... And the blower 15, and the cooling water R sprayed from the nozzles 13, 13 ,.
Is prevented from being discharged to the outside by an air flow, and the tip of a branch pipe 14c branched from the water supply pipe 14a is positioned below the check valve 17, and cooling is ejected from a nozzle 18 attached to the tip. Impurities are scattered by the water R to prevent the impurities from flowing into the pipe 14.

Although the valve V1 is normally closed, the cooling water R can be jetted from the nozzle 18 by opening it as necessary.

On the other hand, reference numeral 20 shown in FIG. 1 is a spot welding machine, which is a movable arm 23 having electrodes 21 and 21,
A copper pipe 27 having an inner diameter of about 4 mm is arranged inside the transformer 23 and the transformer 25, and the flexible pipe 30a,
30b is connected.

By the way, hose nipples 31 and 31 'are attached to one ends of the flexible pipes 30a and 30b as shown in FIG. 2, and these are provided at one end of the water supply pipe 14a and the return water pipe 14b. Coupling c, c '
It is designed to be detachably fitted to.

Therefore, when the pump P is driven, the cooling water R stored in the bottom portion of the cooling tower 10 is sucked into the pump P from the check valve 17, and the water pipe 14a and the flexible pipe 30.
It is pressure-fed to the spot welder 20 through a, passes through the copper pipe 27, the flexible pipe 30b, and the return water pipe 14b inside the spot welder 20, and then is sprayed from the nozzles 13, 13 ,. It will be stored and circulated at the bottom of the tower 10.

When the blower 15 is driven, the louver 1
The outside air flows into the cooling tower 10 from 1 and an air flow from the louver 11 to the blower 15 is generated inside the cooling tower 10.

Therefore, the cooling water R which has passed through the inside of the spot welding machine 20 and has absorbed the heat of the spot welding machine 20 is
By being sprayed from the nozzles 13, 13, ..., It is cooled by the air flow, and then this cooling water R is fed to the spot welding machine 20, so that the spot welding machine 20 cools the cooling water R after cooling. Therefore, it is cooled at any time to prevent overheating.

It should be noted that the spot welder 20 continuously operates 36 times.
When the welding test was performed 0 times, the water temperature at point B was 26 ° C at this point, which was 9 ° C higher than the initial water temperature of 17 ° C, but at point A the cooling effect of the cooling tower 10 was 20 ° C.
Therefore, it was confirmed that the cooling water R sufficient to cool the spot welding machine 20 can be obtained.

[0032]

Since the cooling tower and the method for cooling the spot welding machine according to the present invention are as described above, the following effects can be obtained.

(1) A spot welder can be detachably connected to a pipe for circulating cooling water, and a high output pump can be used to circulate 1 liter or more of cooling water per minute. Is sprayed in a mist form by a nozzle and is brought into direct contact with the air flow. Therefore, the cooling water that has been sufficiently cooled is supplied to the spot welding machine at any time, which is excellent in preventing overheating of the spot welding machine. Produce an effect.

(2) Further, since the cooling water is circulated and used, it has an excellent effect of greatly contributing to water saving.

(3) Further, since a small amount of cooling water is circulated and recooled for use, the capacity of the cooling tower can be made extremely small and space saving can be achieved.

[Brief description of drawings]

FIG. 1 is a system diagram illustrating a cooling method for a cooling tower and a spot welder.

FIG. 2 is an enlarged view showing a connecting portion between a pipe of a cooling tower and a flexible pipe of a spot welding machine.

FIG. 3 is a schematic view showing a cooling method of a conventional spot welding machine.

[Explanation of symbols]

 P Pump R Cooling Tower 10 Cooling Tower 13 Nozzle 14 Piping 14a Water Pipe 14b Return Water Pipe 15 Blower 20 Spot Welder

Claims (2)

[Claims] 1. A cooling tower in which an airflow is generated in a tower by a blower and cooling water circulating in the airflow is directly contacted to recool the cooling water. A flexible pipe via a spot welder can be detachably connected to the circulating pipe, and a pump capable of circulating 1 liter or more of cooling water per minute is interposed in the pipe.
A cooling tower for a spot welding machine, characterized in that the cooling water is ejected in a mist form by a nozzle provided in the upper part of the tower to be brought into contact with the air flow. 2. An air flow is generated in the tower by a blower,
The cooling water sprayed from the nozzle is brought into direct contact with this airflow to cool it, and this cooling water is further pumped to the spot welding machine through a pump, and the pumped cooling water is passed through the inside of the spot welding machine and then the nozzle. A method for cooling a spot welding machine, which comprises spraying from a re-cooling unit.