JP2019005791A - Nozzle cleaning device of welding torch - Google Patents

Abstract

To unfailingly remove spatter adhering to an inner surface and a tip of a nozzle in one process to improve welding quality and efficiency.SOLUTION: A nozzle cleaning device of a welding torch includes: an inner surface cleaning elastic member 20 which contacts an inner surface of a nozzle 101; and a tip cleaning elastic member 30 which is disposed so as to enclose the inner surface cleaning elastic member 20 and contacts a tip of the nozzle 101. Spatter deposited on the inner surface and the tip of the nozzle 101 are removed simultaneously by rotating the inner surface cleaning elastic member 20 and the tip cleaning elastic member 30.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a cleaning device for cleaning a nozzle of a gas shield type welding torch, and particularly belongs to the technical field of a structure for removing spatter deposited on the inner surface and tip of a nozzle.

  Generally, a gas shield type welding torch is used in a field where gas shield arc welding is performed. The gas shield welding torch includes a nozzle, and is configured to supply a welding wire while ejecting gas from the nozzle. Spatter is generated during welding, and the generated spatter adheres to and accumulates not only on the tip of the nozzle but also on the inner surface of the nozzle. Sputter deposition may lead to poor welding and may lead to equipment shutdown in the case of automatic welding equipment. Therefore, it is necessary to periodically clean the nozzle.

  As a nozzle cleaning device for a welding torch, for example, those disclosed in Patent Documents 1 to 3 are known. Patent Document 1 includes a coil spring inserted into a nozzle, a stepped brush, and a rotation mechanism that rotates the coil spring and the stepped brush. When cleaning the nozzle, a coil spring is inserted into the nozzle to remove spatter on the inner surface of the nozzle, and then the tip of the nozzle is brought into contact with a stepped brush to remove spatter at the tip of the nozzle. .

  Patent Document 2 includes a coil spring inserted into the nozzle and a cold air supply means for supplying cold air to the tip of the nozzle. Sputter on the inner surface of the nozzle is removed by a coil spring, and spatter at the tip of the nozzle is cold air. It is removed by supply.

  Patent document 3 is provided with the coil spring inserted in a nozzle, and the blade tool which contacts the front-end | tip of a nozzle. When cleaning the nozzle, a coil spring is inserted into the nozzle to remove spatter on the inner surface of the nozzle, and then the tip of the nozzle is brought into contact with the blade to remove spatter at the tip of the nozzle.

JP 2008-302368 A Utility Model Registration No. 3158385 JP2003-31423A

  By the way, in Patent Document 1, since the inner surface of the nozzle is cleaned with a coil spring and the tip of the nozzle is cleaned with a stepped brush, at least two steps are required, and the time required for cleaning becomes longer. In addition, it is necessary to change the manner in which the nozzle is applied to the stepped brush according to the deposition state of the spatter and the worn state of the stepped brush.

  In Patent Document 2, the inner surface of the nozzle is cleaned with a coil spring, and the tip of the nozzle is cleaned with cold air. Generally, the difference between the thermal expansion coefficient of the copper alloy used in the nozzle and the thermal expansion coefficient of the sputter is used. In such a case, a sufficient effect cannot be expected for removing spatter at the tip of the nozzle.

  Further, in Patent Document 3, since the inner surface of the nozzle is cleaned with a coil spring and the tip of the nozzle is cleaned with a blade, at least two steps are required as in Patent Document 1, and the time required for cleaning is long. It becomes time. Further, it is necessary to change the way of applying the nozzle to the blade according to the sputter deposition state and the state of wear of the blade.

  The present invention has been made in view of such points, and the object of the present invention is to improve the welding quality and efficiency by reliably removing sputter deposited on the inner surface and the tip of the nozzle in one step. is there.

  To achieve the above object, according to the present invention, an inner surface cleaning elastic member inserted into the nozzle and a tip cleaning elastic member that contacts the tip of the nozzle separately from the inner surface cleaning elastic member are provided. The cleaning elastic member and the tip cleaning elastic member are driven to rotate.

  1st invention is the nozzle cleaning apparatus of the welding torch which cleans the nozzle of a gas shield type welding torch, The elastic member for inner surface cleaning inserted in the inside of this nozzle from the front-end | tip of the said nozzle, and contacting the inner surface of this nozzle; The tip cleaning elastic member disposed so as to surround the inner surface cleaning elastic member and contacting the tip of the nozzle, and the inner surface cleaning elastic member and the tip cleaning elastic member are rotated around the axis of the nozzle. And a drive unit for driving.

  According to this configuration, when the inner surface cleaning elastic member is inserted into the nozzle, the inner surface cleaning elastic member comes into contact with the inner surface of the nozzle. At this time, since the tip cleaning elastic member is disposed so as to surround the inner surface cleaning elastic member, the tip cleaning elastic member comes into contact with the tip of the nozzle. When the inner surface cleaning elastic member rotates in this state, the inner surface cleaning elastic member scrapes off the spatter accumulated on the inner surface of the nozzle. If the sputter deposition state on the inner surface of the nozzle is different or the wear state of the inner surface cleaning elastic member is different from the initial state, it can be dealt with by elastically deforming the inner surface cleaning elastic member. Further, when the tip cleaning elastic member rotates, the tip cleaning elastic member scrapes off the spatter accumulated at the tip of the nozzle. When the sputter deposition state at the tip of the nozzle is different, or when the wear state of the tip cleaning elastic member is different from the initial state, the tip cleaning elastic member is elastically deformed. That is, it becomes possible to reliably remove the sputters adhering to the inner surface and the tip of the nozzle in one step.

  According to a second invention, in the first invention, the inner surface cleaning elastic member and the tip cleaning elastic member are coil springs arranged so as to compressively deform in the axial direction of the nozzle. .

  According to this configuration, the inner surface cleaning elastic member and the tip cleaning elastic member can be obtained at low cost. Further, when cleaning is performed by moving the nozzle with a robot or the like, it is possible to allow a slight positional deviation of the nozzle by compressive deformation of the inner surface cleaning elastic member and the tip cleaning elastic member.

  According to a third aspect, in the second aspect, the tip cleaning elastic member is disposed so that one end thereof is in contact with the tip of the nozzle.

  According to this configuration, the sputter deposited on the tip of the nozzle can be removed by scraping with one end of the tip cleaning elastic member, that is, the end of the coil spring.

  According to a fourth aspect, in the third aspect, the tip in the insertion direction of the inner surface cleaning elastic member into the nozzle protrudes in the insertion direction into the nozzle from one end of the tip cleaning elastic member. Features.

  According to this configuration, the inner surface cleaning elastic member can be sufficiently inserted into the nozzle.

  According to a fifth invention, in any one of the second to fourth inventions, a spring constant of the tip cleaning elastic member is set larger than a spring constant of the inner surface cleaning elastic member. .

  That is, when the inner surface cleaning elastic member and the tip cleaning elastic member are rotated, rotational blur may occur due to centrifugal force. In this invention, the spring constant of the tip cleaning elastic member is large. The member is less likely to shake. Further, since the inner surface cleaning elastic member disposed so as to be surrounded by the tip cleaning elastic member is supported from the outside by the tip cleaning elastic member, the inner surface cleaning elastic member is also less likely to shake.

  According to a sixth invention, in any one of the second to fifth inventions, a wire diameter of the elastic member for tip cleaning is set larger than a wire diameter of the elastic member for inner surface cleaning. .

  According to this configuration, since the wire diameter of the tip cleaning elastic member is large, the tip cleaning elastic member easily comes into contact with the tip of the nozzle even if the nozzle is slightly displaced in the radial direction. Moreover, since the wire diameter of the elastic member for internal cleaning is small, it becomes easy to insert the elastic member for internal cleaning into the inside of a nozzle.

  In a seventh aspect based on any one of the first to sixth aspects, the drive unit rotates the fixing member to which the inner surface cleaning elastic member and the tip cleaning elastic member are fixed, and the fixing member. And a motor.

  According to this configuration, when the fixing member is rotated by the motor, the inner surface cleaning elastic member and the tip cleaning elastic member can be simultaneously rotated.

  According to the first invention, the inner surface cleaning elastic member that contacts the inner surface of the nozzle and the tip cleaning elastic member that contacts the tip of the nozzle are driven to rotate around the axis of the nozzle. Spatter adhering to the inner surface and the tip can be reliably removed in one step, and the welding quality and efficiency can be improved.

  According to the second invention, since the inner surface cleaning elastic member and the tip cleaning elastic member are coil springs, it is possible to allow a slight displacement of the nozzle while reducing the cost.

  According to the third aspect of the invention, the sputter deposited on the tip of the nozzle can be reliably removed by the end of the coil spring.

  According to the fourth aspect of the invention, since the front end of the inner surface cleaning elastic member is protruded from one end of the front end cleaning elastic member, the inner surface cleaning elastic member is sufficiently inserted into the inside of the nozzle. A wide range can be cleaned.

  According to the fifth aspect, it is possible to suppress rotational blurring of the inner surface cleaning elastic member and the tip cleaning elastic member.

  According to the sixth aspect, since the wire diameter of the tip cleaning elastic member is larger than the wire diameter of the inner surface cleaning elastic member, the tip cleaning elastic member can be easily brought into contact with the tip of the nozzle, and the inner surface cleaning can be performed. It becomes easy to insert the elastic member for use into the nozzle.

  According to the seventh aspect, since the inner surface cleaning elastic member and the tip cleaning elastic member can be driven to rotate by the common motor, the structure can be simplified.

It is a perspective view of the nozzle cleaning device of the welding torch according to the embodiment. It is a top view of the nozzle cleaning apparatus of a welding torch. It is a front view of the nozzle cleaning apparatus of a welding torch. It is sectional drawing of the nozzle cleaning apparatus of a welding torch, and shows the state which is cleaning the welding torch.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a perspective view of a nozzle cleaning device 1 for a welding torch according to an embodiment of the present invention as viewed obliquely from above, and FIG. 2 is a plan view of the nozzle cleaning device 1 for a welding torch as viewed from above. FIG. 3 is a front view of the nozzle cleaning device 1 of the welding torch.

(Configuration of welding equipment)
The nozzle cleaning device 1 for a welding torch is installed, for example, at a site where gas shield arc welding is performed, and can simultaneously clean the inner surface and the tip 101b of the nozzle 101 of the gas shield welding torch 100 as shown in FIG. It is configured. That is, in a field where gas shield arc welding is performed, a gas shield welding torch 100 shown in FIG. 4 is used. The gas shield welding torch 100 includes a nozzle 101 made of a cylindrical member and a wire support member 102 disposed inside the nozzle 101. The wire support member 102 is a columnar member disposed concentrically with the nozzle 101, and a wire (not shown) is inserted into a hole 102 a formed at the center of the wire support member 102 and supplied. ing. A gap is formed between the inner surface 101a of the nozzle 101 and the outer surface of the wire support member 102 over the entire circumference.

  Spatter is generated during welding. The generated spatter not only adheres to and accumulates on the tip 101b of the nozzle 101, but also there is a gap between the inner surface 101a of the nozzle 101 and the outer surface of the wire support member 102. May adhere and deposit on the inner surface 101a.

  The gas shield welding torch 100 can be used for automatic welding equipment. For example, by causing the robot to grip the gas shield welding torch 100 and moving the robot so as to draw a predetermined trajectory by the robot, welding can be automatically performed regardless of the operator. The gas shield welding torch 100 is not limited to automatic welding equipment, and various welding can be performed while the operator holds and moves the gas shielding welding torch 100.

(Configuration of Welding Torch Nozzle Cleaning Device 1)
As shown in FIG. 1 to FIG. 3, the nozzle cleaning device 1 for a welding torch includes an inner surface cleaning that is inserted into the nozzle 101 from the main body 10 and the tip 101 b of the nozzle 101 and contacts the inner surface 101 a of the nozzle 101. The elastic member 20 for cleaning and the elastic member 30 for front end cleaning arranged so as to surround the inner surface cleaning elastic member 20 and contacting the front end 101b of the nozzle 101 are provided. The nozzle cleaning device 1 can also be a part of welding equipment.

  The main body 10 includes a housing 11 and a drive unit (drive unit) 14 shown in FIGS. 3 and 4. The casing 11 can be fixed to, for example, welding equipment at a welding site. It is preferable that the place where the housing 11 is fixed is away from the place where the welding is actually performed and that the welding torch 100 can be moved by the robot.

  The drive unit 14 is for rotationally driving the inner surface cleaning elastic member 20 and the tip cleaning elastic member 30 around the axis of the nozzle 101 of the welding torch 100. The drive unit 14 includes a motor 12 that is fixed to the housing 11 while being accommodated in the housing 11, and a fixing member 13 to which the inner surface cleaning elastic member 20 and the tip cleaning elastic member 30 are fixed. The inner cleaning elastic member 20 and the tip cleaning elastic member 30 can be driven to rotate by rotating the fixing member 13 by the motor 12.

  The motor 12 is a conventionally known electric motor. As shown in FIG. 4, a control device 40 is connected to the motor 12. The control device 40 supplies a current to the motor 12 based on an externally input signal or an ON / OFF operation of a manual switch (not shown) to activate the motor 12, and the current to the motor 12 is also controlled. The motor 12 can be stopped by shutting off the supply. The rotation speed (the number of rotations per unit time) of the motor 12 can be adjusted by the control device 40.

  The motor 12 is provided with an output shaft 12a. The motor 12 is arranged such that the output shaft 12 a extends in the vertical direction, and the output shaft 12 a protrudes upward from the upper surface of the housing 11. The fixing member 13 is a substantially disc-shaped member. The fixing member 13 is disposed so as to be orthogonal to the output shaft 12a, and the upper surface 13a of the fixing member 13 extends substantially horizontally. The lower ends of the inner surface cleaning elastic member 20 and the tip cleaning elastic member 30 are fixed to the upper surface 13a of the fixing member 13 by, for example, welding. A fitting hole 13 b into which the upper end of the output shaft 12 a is fitted is formed on the lower surface of the fixing member 13. The output shaft 12 a is fixed with its upper end fitted in the fitting hole 13 b of the fixing member 13.

  The inner surface cleaning elastic member 20 is a coil spring disposed so as to be compressed and deformed in the direction of the axis of the nozzle 101 of the welding torch 100 (indicated by a symbol X in FIG. 3). In this embodiment, since the axial center of the nozzle 101 extends in the vertical direction, the compression deformation direction of the inner surface cleaning elastic member 20 is the vertical direction. The length (vertical dimension) of the inner surface cleaning elastic member 20 is set longer than the vertical dimension of the cleaning range of the nozzle 101. The upper side of the inner surface cleaning elastic member 20 is a portion that is inserted into the nozzle 101 from the tip 101 b of the nozzle 101 and contacts the inner surface 101 a of the nozzle 101. Therefore, the outer diameter of the inner surface cleaning elastic member 20 is set slightly smaller than the inner diameter of the nozzle 101.

  The tip cleaning elastic member 30 is a coil spring disposed so as to be compressed and deformed in the direction of the axial center (indicated by symbol X in FIG. 3) of the nozzle 101 of the welding torch 100, and similarly to the inner surface cleaning elastic member 20, The direction of compressive deformation of the tip cleaning elastic member 30 is the vertical direction. Further, the upper end (one end) 30 a of the tip cleaning elastic member 30 is disposed so as to contact the tip 101 b of the nozzle 101.

  The inner diameter of the tip cleaning elastic member 30 is set larger than the outer diameter of the inner surface cleaning elastic member 20, and a gap is formed between the tip cleaning elastic member 30 and the inner surface cleaning elastic member 20. I can leave. Further, the outer diameter of the tip cleaning elastic member 30 is set to be larger than the inner diameter of the nozzle 101 of the welding torch 100, so that the tip cleaning elastic member 30 does not enter the nozzle 101. The outer diameter and inner diameter of the tip cleaning elastic member 30 are set so that the upper end 30 a of the tip cleaning elastic member 30 contacts the tip 101 b of the nozzle 101. That is, the outer diameter of the tip cleaning elastic member 30 is larger than the inner diameter of the tip 101b of the nozzle 101, and the inner diameter of the tip cleaning elastic member 30 is smaller than the outer diameter of the tip 101b of the nozzle 101. Yes.

  The front end (upper end) 20a of the inner surface cleaning elastic member 20 in the insertion direction into the nozzle 101 protrudes in the insertion direction (upward) into the nozzle 101 from the upper end 30a of the front end cleaning elastic member 30. This projecting dimension can be set to be approximately the same as the vertical dimension of the cleaning range of the nozzle 101. The wire diameter of the wire constituting the inner surface cleaning elastic member 20 is set smaller than the gap between the nozzle 101 and the wire support member 102. Further, the inner diameter of the inner surface cleaning elastic member 20 is set to be slightly larger than the outer diameter of the wire support member 102.

  The spring constant of the tip cleaning elastic member 30 is set to be larger than the spring constant of the inner surface cleaning elastic member 20. Accordingly, when the external force is applied, the tip cleaning elastic member 30 is less likely to be deformed than the inner surface cleaning elastic member 20.

  Furthermore, the wire diameter of the wire constituting the tip cleaning elastic member 30 is set larger than the wire diameter of the wire constituting the inner surface cleaning elastic member 20. Specifically, the wire diameter of the wire constituting the tip cleaning elastic member 30 is larger than the thickness dimension of the peripheral wall portion of the nozzle 101.

(Nozzle cleaning method)
Next, the point which cleans the nozzle 101 of the welding torch 100 using the nozzle cleaning apparatus 1 comprised as mentioned above is demonstrated. When current is supplied from the control device 40 to the motor 12 and the output shaft 12a of the motor 12 rotates, the fixing member 13 rotates and the inner surface cleaning elastic member 20 and the tip cleaning elastic member 30 rotate. Since it is unavoidable that the inner surface cleaning elastic member 20 and the tip cleaning elastic member 30 are distorted in shape, when the centrifugal force acts on the inner surface cleaning elastic member 20 and the tip cleaning elastic member 30, rotational vibration is generated. May occur. At this time, since the spring constant of the tip cleaning elastic member 30 is larger than the spring constant of the inner surface cleaning elastic member 20, the tip cleaning elastic member 30 is less likely to shake. Further, since the inner surface cleaning elastic member 20 is disposed so as to be surrounded by the tip cleaning elastic member 30 which is not easily shaken, the inner surface cleaning elastic member 20 can be supported from the outside by the front end cleaning elastic member 30. The inner surface cleaning elastic member 20 is also less likely to shake.

  While the inner surface cleaning elastic member 20 and the tip cleaning elastic member 30 are rotating, the nozzle 101 of the welding torch 100 is moved by a robot, and the tip 101b of the nozzle 101 is moved to the inner surface cleaning elastic member 20 and tip cleaning. After disposing the elastic member 30 so as to face the upper ends 20a, 30a, as shown in FIG. 4, the nozzle 101 is moved downward to move the upper portion of the inner surface cleaning elastic member 20 from the tip 101b of the nozzle 101 to the nozzle. 101 is inserted inside. Then, the nozzle 101 is moved downward until the tip cleaning elastic member 30 contacts the tip 101b of the nozzle 101.

  As a result, the upper portion of the inner surface cleaning elastic member 20 comes into contact with the inner surface 101 a of the nozzle 101. Since the inner surface cleaning elastic member 20 is rotating, the inner surface cleaning elastic member 20 scrapes off the spatter deposited on the inner surface 101a of the nozzle 101. When the sputter deposition state on the inner surface 101a of the nozzle 101 is different or the wear state of the inner surface cleaning elastic member 20 is different from the initial state, the inner surface cleaning elastic member 20 can be elastically deformed in the radial direction. .

  Further, when the inner surface cleaning elastic member 20 is shaken by rotation, the inner surface cleaning elastic member 20 contacts the outer surface of the wire support member 102. Thereby, the sputter | spatter deposited on the outer surface of the wire support member 102 can also be removed.

  Further, since the tip cleaning elastic member 30 is also rotated, the upper end 30a of the tip cleaning elastic member 30 scrapes off the sputter deposited on the tip 101b of the nozzle 101. In particular, when the upper end 30a of the elastic member 30 for tip cleaning hits the spatter, it can be removed by removing the spatter. Further, when the sputter deposition state at the tip 101b of the nozzle 101 is different or when the wear state of the tip cleaning elastic member 30 is different from the initial state, the tip cleaning elastic member 30 is elastically deformed in the axial direction or the radial direction. This is possible. That is, the sputters adhering to the inner surface 101a and the tip 101b of the nozzle 101 can be reliably removed in one step by the inner surface cleaning elastic member 20 and the tip cleaning elastic member 30.

  Further, when cleaning is performed by moving the nozzle 101 by a robot, the nozzle 101 may be slightly displaced. This displacement of the nozzle 101 is caused by compression of the inner surface cleaning elastic member 20 and the tip cleaning elastic member 30. It becomes possible to allow by deformation or the like.

(Effect of embodiment)
As described above, according to the nozzle cleaning device 1 of the welding torch according to this embodiment, the inner surface cleaning elastic member 20 that contacts the inner surface 101 a of the nozzle 101 and the tip cleaning elasticity that contacts the tip 101 b of the nozzle 101. Since the member 30 is rotationally driven around the axis of the nozzle 101, the spatter adhering to the inner surface 101a and the tip 101b of the nozzle 101 can be reliably removed in one step, and the welding quality and efficiency are improved. Can do.

  Further, since the inner surface cleaning elastic member 20 and the tip cleaning elastic member 30 are coil springs, it is possible to allow a slight displacement of the nozzle 101 while reducing the cost.

  Moreover, since the insertion direction front end 20a of the inner surface cleaning elastic member 20 is protruded from the one end 30a of the front end cleaning elastic member 30, the inner surface cleaning elastic member 20 is sufficiently inserted into the nozzle 101 and the inner surface of the nozzle 101 is inserted. A wide range of 101a can be cleaned.

  The above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  As described above, the nozzle cleaning device for a welding torch according to the present invention can be used, for example, when cleaning a nozzle of a gas shield type welding torch.

1 Nozzle Cleaning Device 14 Drive Unit (Drive Unit)
20 inner surface cleaning elastic member 30 tip cleaning elastic member 100 welding torch 101 nozzle 101a inner surface

Claims (7)

In the nozzle cleaning device of a welding torch that cleans the nozzle of a gas shield type welding torch,
An elastic member for inner surface cleaning that is inserted into the nozzle from the tip of the nozzle and contacts the inner surface of the nozzle;
A tip cleaning elastic member disposed so as to surround the inner surface cleaning elastic member and contacting the tip of the nozzle;
A nozzle cleaning device for a welding torch, comprising: an inner surface cleaning elastic member; and a drive unit that rotationally drives the tip cleaning elastic member around an axis of the nozzle. In the nozzle cleaning device of the welding torch according to claim 1,
The nozzle cleaning device for a welding torch, wherein the inner surface cleaning elastic member and the tip cleaning elastic member are coil springs arranged so as to compressively deform in the axial direction of the nozzle. In the nozzle cleaning device of the welding torch according to claim 2,
A nozzle cleaning device for a welding torch, wherein one end of the tip cleaning elastic member is disposed so as to contact the tip of the nozzle. In the nozzle cleaning device of the welding torch according to claim 3,
The nozzle cleaning device for a welding torch, characterized in that the tip of the inner surface cleaning elastic member in the insertion direction into the nozzle protrudes in the insertion direction into the nozzle from one end of the tip cleaning elastic member. In the nozzle cleaning device of the welding torch according to any one of claims 2 to 4,
The spring cleaning constant of the tip cleaning elastic member is set to be larger than the spring constant of the inner surface cleaning elastic member. In the nozzle cleaning device of the welding torch according to any one of claims 2 to 5,
The nozzle cleaning device for a welding torch, wherein the wire diameter of the tip cleaning elastic member is set larger than the wire diameter of the inner surface cleaning elastic member. In the nozzle cleaning device of the welding torch according to any one of claims 1 to 6,
The nozzle cleaning device for a welding torch, wherein the driving unit includes a fixing member to which the inner surface cleaning elastic member and the tip cleaning elastic member are fixed, and a motor that rotates the fixing member.

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