JP3456696B2 - Pressurized drive for electric welding gun - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure drive device for a welding gun driven by an electric motor, and more particularly to a pressure drive device for an electric welding gun in which the pressure drive device is easily assembled in a box. is there.

[0002]

2. Description of the Related Art Conventionally, a pressurizing drive device is arranged in a cylinder, a ball nut is fixed to a detent block, and a pressurizing rod having a flange is fixed to the ball nut. -71474 gazette (hereinafter,
It is publicly known as shown in the first conventional example).

In addition, a ball nut is fixed to the detent block, a pressure rod is slidably attached to the detent block, and a detent flange is provided on the pressure rod. It is known as disclosed in Japanese Patent Application Laid-Open No. 7-60453 (hereinafter referred to as a second conventional example).

Further, the housing of the pressure drive device is constructed in the form of a box, and the rotation of the ball nut is stopped by the pressure rod.
The one in which a rotation preventing block is provided between the pressure rod and the box body is known as disclosed in, for example, Japanese Utility Model No. 3042267 (hereinafter, referred to as a third conventional example).

[0005]

By the way, a ball nut is fixed to the detent block as in the first conventional example, and a pressure rod having a flange is fixed to the ball nut, or (2) A ball nut is fixed to a detent block as in the conventional example, a pressure rod is slidably attached to the detent block, and a detent flange is provided on the pressure rod, or In the second conventional example, the rotation of the ball nut is prevented by a pressure rod, and a rotation prevention block is provided between the pressure rod and the box body. Since the stopper and the rotation stop of the pressure rod are performed in different places, the rotation stop structure becomes complicated and each installation space is required, and there is a limit to the design in a narrow place.
It is difficult to assemble the detent inside the housing, and there is a risk that the pressurizing drive device becomes large.

The present invention has been made in view of the above problems, and an object of the present invention is to prevent the rotation of the ball nut and the rotation of the pressure rod by one rotation stop block. SUMMARY OF THE INVENTION It is an object of the present invention to provide a pressure drive device for an electric welding gun which can be downsized and which can be easily assembled in a box.

[0007]

In order to achieve the above-mentioned object, a pressure drive device for an electric welding gun according to the present invention comprises a housing of the pressure drive device having a box-shaped cross section. A carrying-in window for the rotation-stop block of the pressure drive device is formed on one side surface of the box body, and the rear end of the pressure rod inserted into the box body and the rotation of the electric motor inserted into the box body are interlocked. It is characterized in that a ball nut with which a ball screw that makes a rotary motion is screwed is fixed to each of the detent blocks.

Further, the pressure rod is constituted by a straight rod, and a pin is driven into the detent block in a direction crossing the axial direction of the pressure rod to fix the pressure rod to the detent block. It is a thing.

Further, the present invention is characterized in that a bracket for mounting an electric motor is attached to a box for accommodating the pressure drive device.

Further, the straight rod of the pressure rod is constituted by a pipe.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. In the figure, 1 is a pressurizing drive device for driving an arm (not shown) of a welding machine, and 2 is an electric motor for operating the pressurizing drive device 1. 1 side by side.

The housing of the pressure drive device 1 is composed of a box body 3 having a substantially square cross section, and a rotation prevention block 4 of the pressure drive device 1 is carried into one side surface (for example, a bottom surface) of the box body 3. A carry-in window 5 for forming is formed. Also, the box 3
The front wall 6 is formed with a hole 8 for inserting and penetrating the pressure rod 7 and holes 10, 10 for supporting and fixing the guide rods 9, 9 of the detent block 4.
Further, the shaft 1 of the ball screw 12 is provided on the rear wall 11 of the box body 3.
A hole 14 for inserting and penetrating 3 and holes 15, 15 for supporting and fixing the rear end portions of the guide rods 9, 9 are formed.

The rear end of the pressure rod 7 is fixed to the front wall side of the detent block 4, and the ball screw 12 is screwed to the rear wall side of the detent block 4. The lunut 16 is fixed, and the detent block 4 is movable back and forth in the box 3 by the guide rods 9, 9.

An endless belt 19 is stretched between the output shaft 17 of the electric motor 2 and the pulley 18 attached to the ball screw shaft 13.

In the above construction, when the electric motor 2 is driven, its rotational force rotates the ball screw shaft 13 via the endless belt 19, and the rotation of the ball screw 12 causes the ball nut 16 to reciprocate. After the conversion, the pressure rod 7 is reciprocated through the rotation-stop block 4 to move the arm of the welding machine (not shown) to press or open the work.

By the way, since the carry-in window 5 of the rotation preventing block 4 is formed on one side surface of the box body 3, the pressure drive device 1 can be assembled in the box body 3. That is,
The detent block 4 with the nuts 16 secured in advance by bolts or the like is loaded into the box 3 through the loading window 5 (the ball nut 16 may be secured to the detent block 4 in the box 3), and then the box The guide rods 9 and 9 are inserted and fixed in the body 3. When the guide rod 9 is inserted, the detent block 4 is in a skewed state so that the detent block 4 can be stopped by the guide rod 9 and guided.

Next, the pressure rod 7 is partially inserted into the box body 3 through the hole 8 in the front wall 6 of the box body 3, and the rear end of the pressure rod 7 is fixed to the detent block 4 by a pin or the like. In addition, the ball screw 12 is inserted from the hole 14 in the rear wall 11 of the box body 3 to the top of the ball.
Insert the screw shaft 13. At this time, the ball screw 12 is screwed with the ball nut 16 fixed to the detent block 4. An endless belt 19 is stretched between the pulley 18 provided on the ball screw shaft 13 and the output shaft 17 of the electric motor 2 on the outer side of the rear portion of the box body 3.

In this embodiment, the housing of the pressure drive device 1 is composed of a box body 3 having a substantially square cross section.
The carrying-in window 5 of the rotation-stop block 4 of the pressurizing drive device 1 is formed on one side surface, and the rear end of the pressurizing rod 7 inserted into the box body 3 and the electric motor 2 inserted into the box body 3 are connected. Since the ball nuts 16 with which the ball screws 12 that rotate in conjunction with the rotation are screwed are fixed to the rotation preventing blocks 4, respectively, the rigidity of the housing is maintained, and the front and rear walls 6, 6 of the box body 3. The holes 8 and 14 formed in 11 are easily drilled as the same core, the holes 10 and 15 can be simultaneously drilled, and the detent of the ball nut 16 and the detent of the pressure rod 7 are one detent block 4. The installation space is small. In addition, the pressure rod 7 can be easily attached to the detent block 4 carried in through the carry-in window 5.

Reference numeral 20 is a lid that closes the carry-in window 5 of the box body 3, and after the pressure drive device 1 is installed in the box body 3,
The lid 20 prevents dust and the like from entering the box 3.

Then, as shown in FIGS. 1, 3 and 4,
The pressure rod 7 is composed of a straight rod, and the rotation prevention block 4
The pins 20, 2 in a direction intersecting the axial direction of the pressure rod 7.
When the pressure rod 7 is fixed to the detent block 4 by hitting 0, the pressure rod 7 is inserted into the box body 3 when the pressure rod 7 is fixed to the detent block 4. In addition, since the pressure rod 7 can be fixed to the detent block 4 simply by driving the pins 20, 20, the fixing work can be extremely simple. Further, even if an excessive rotational torque is applied to the pressure rod 7 during the welding operation, the pin 20 is deformed or damaged, so that damage to each component of the pressure drive device 1 is prevented.

Further, if the straight rod-shaped pressure rod 7 is formed of a pipe, a commercially available pipe can be applied to the pressure rod 7 without any special processing.

Further, as shown in FIGS. 1 and 2, when the bracket 21 for mounting the electric motor 2 is attached to the box body 3 for accommodating the pressure drive device 1, the bracket 21 is attached to the box body 3. Depending on the mounting direction of the electric motor 2, the electric motor 2 can be arranged at any of the left, right, upper and lower parts with respect to the pressure drive device 1.

In the above embodiment, two guide rods 9 of the rotation-stop block 4 are arranged in the box body 3. However, when the gun has a small capacity, the guide rod 9 is provided.
May be omitted. Further, as shown in FIG. 6, without using the guide rod 9, a guide groove 23 is formed in the inner wall 22 of the box body 3, and the protrusion 24 of the rotation preventing block 4 is engaged with the guide groove 23 to rotate the guide groove 23. The stop block 4 may be movable along the guide groove 23.

[0024]

In the pressure driving device for the electric welding gun according to the present invention, the housing of the pressure driving device is constituted by a box body having a substantially square cross section, and the pressure driving device is provided on one side surface of the box body. In addition to forming the carry-in window of the rotation-stop block, the rear end of the pressure rod inserted into the box and the ball screw that is inserted into the box and rotates in conjunction with the rotation of the electric motor are screwed together. Since the ball nuts are fixed to the detent blocks respectively, the rigidity of the housing is maintained, the parts to be mounted inside the box can be easily and accurately centered, and the ball nut detent and pressure rod The detent is done with a single detent block, so the mounting space is small and the pressure drive device can be downsized, and the pressure rod is easy to attach to the detent block loaded from the carry-in window. Welding that can be attached to The emission of the pressure drive unit.

Further, when the pressure rod is constituted by a straight rod, and a pin is driven into the detent block in a direction intersecting the axial direction of the pressure rod to fix the pressure rod to the detent block, the pressure rod is added. The pressure rod can be easily inserted into the box body, and the pressure rod can be easily fixed to the detent block 4, so that the fixing work can be performed very easily. Further, even if excessive pressure is applied to the pressure rod during welding, the pin is deformed or damaged to prevent damage to each component of the pressure drive device. It becomes a driving device.

When a bracket for mounting the electric motor is attached to the box for accommodating the pressure driving device, the electric motor is moved to the left, right, up and down with respect to the pressure driving device depending on the mounting direction of the bracket to the box. It can be arranged in any part of the above, and is a pressurizing drive device of an electric welding gun for providing a welding machine corresponding to the environment of the welding work site.

Further, when the straight rod-shaped pressure rod is formed of a pipe, a commercially available pipe can be applied to the pressure rod without any special processing, and the cost of the electric welding gun is low. It becomes a driving device.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of a pressure drive device for an electric welding gun according to the present invention.

FIG. 2 is a front view thereof.

FIG. 3 is a side view of FIG.

FIG. 4 is a sectional view taken along line AA of FIG.

5 is a sectional view taken along line BB of FIG.

FIG. 6 is a sectional view corresponding to FIG. 5 in another embodiment.

[Explanation of symbols]

1 Pressure drive device 2 electric motor 3 boxes 4 Non-rotating block 5 carry-in windows 7 Pressure rod 12 ball screws 16 ball nuts 20 pin 21 bracket

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiki Takahashi Ohara 4-chome 2-32, Oue, Ayase City, Kanagawa Prefecture (56) Reference JP-A-8-39262 (JP, A) −49182 (JP, U) Registered utility model 3061495 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B23K 11/11

Claims (4)

(57) [Claims] 1. A pressurizing drive device for a welding gun driven by an electric motor, wherein a housing of the pressurizing drive device is formed of a box body having a substantially square cross section, and the pressurizing drive device is provided on one side surface of the box body. And the rear end of the pressure rod that is inserted into the box, and the ball screw that is inserted into the box and that rotates in conjunction with the rotation of the electric motor are screwed together. And a ball nut, which are fixed to the detent block, respectively. 2. The pressure rod is constituted by a straight rod, and a pin is driven into the detent block in a direction intersecting the axial direction of the pressure rod to fix the pressure rod to the detent block. The pressure drive device for the electric welding gun according to claim 1. 3. A pressurizing drive device for an electric welding gun according to claim 1, wherein a bracket for mounting an electric motor is attached to a box body for accommodating the pressurizing drive device. 4. A pressurizing drive device for an electric welding gun according to claim 2, wherein the direct rod of said pressurizing rod is constituted by a pipe.