KR20200006271A - Apparatus for detecing welding defect by tension - Google Patents

Abstract

According to the present invention, a welding defect inspection apparatus comprises: a body unit having a first and a second support unit which are separated from each other, face each other, and are integrally formed thereon; a first movable unit which is slidably installed on the first support unit, and moves between a first standby position and a first work position between the first and the second support unit; a pair of support columns which are separated by a distance longer than the length of a drum-shaped object to be measured, are installed on the first movable unit, maintain a prescribed distance from the second support unit at the first standby position, and allow ends thereof to be supported on the second support unit at the first work position; and a second movable unit which is slidably installed on the second support unit between the pair of support columns, and moves between a second standby position and a second work position between the first and the second support unit. Therefore, a cup shape is formed on a welding line of the drum-shaped object to be measured by pressing of the first and the second movable unit between the pair of support columns. Therefore, an upper pressing unit inserted into the drum-shaped object to be measured can be supported on a front and a rear portion of the drum to have a mechanical structure capable of exhibiting sufficient pressing power and reduce the size of equipment.

Description

Welding defect inspection device {APPARATUS FOR DETECING WELDING DEFECT BY TENSION}

The present invention relates to a welding defect inspection apparatus, and more particularly to a welding defect inspection apparatus suitable for inspecting the drum welding defect of the drum washing machine.

In general, weld inspections include nondestructive inspection and destructive inspection.

The Ericsson test is widely known as a destructive test. The Erichsen test is used to fix the specimen, punch the pressurized specimen to form a cup shape, and weld lines are stretched to the left and right to detect defects in the weld.

Recently, laser beam welding (LBW) is capable of low heat input welding compared to conventional gas tungsten arc welding (ERTA) or electric resistance welding (ERW), and the effect of heat is small due to the narrow width of the weld bead and the weld heat affected zone. Due to the characteristic heat deterioration can be suppressed and high density heat source can be concentrated in a small area, the welding speed is increased and high speed welding is widely used.

In order to increase the precision during laser welding, the role of the fixing jig for fixing the base material is very important. In particular, during welding, the gap between left and right base metals should be minimized to prevent welding defects.

The drum of the drum washing machine rolls the thin plate with a drum phenomenon to taste the two ends. Therefore, the jig design for firmly fixing the two ends of the thin steel sheet by accurately tasting it is not simple.

In addition, even if tightly fixed with a jig, the gap between the tastes is not perfectly uniform. Therefore, a large amount of heat is not provided when the laser beam is passed in a wide area where the taste gaps, so welding failure occurs. Such wide gaps may cause pores due to poor welding. In the drum of the drum washing machine, when the pores are formed due to a poor welding, the washing water leaks through these pores, which causes leakage of the product.

Therefore, after the drum welding process, it is necessary to check for weld defects using the Erichsen test.

However, the drum shape is not only large but also has a problem that the press structure is large because a pressurization portion must be inserted into the drum and a mechanical structure for applying sufficient pressure is required. On the other hand, when the pressure structure is configured as a cantilever type can be reduced in size, but there is a problem that can not give a large pressing force.

Therefore, the development of weld defect inspection equipment suitable for the drum of the drum washing machine is required.

Patent 10-1532694 Patent Registration 10-1447964 Patent Publication 10-2015-0049985 Patent Publication 10-2012-0110532 Patent Publication 10-2002-0009431 Patent Document 10-2001-0064693

An object of the present invention for solving the above problems is to provide a welding defect inspection apparatus suitable for the drum-type welded object.

Another object of the present invention is to provide a welding defect inspection apparatus that can exert sufficient pressure while minimizing the size of equipment.

In order to achieve the above object of the present invention, the weld joint inspection apparatus of the present invention includes a body part integrally formed with a first support part and a second support part facing each other at a predetermined interval, and is slidably installed on the first support part. A first movable part which moves between the first waiting position and the first working position between the first supporting part and the second supporting part, and the first movable part at intervals longer than the length of the drum-type object to be measured, respectively; At a certain distance from the second support portion, and in the first working position, a pair of support pillars whose ends are supported by the second support portion and a second support portion between the pair of support pillars are slidably installed. And a second movable portion moving between the second standby position and the second working position between the first support portion and the second support portion. Therefore, a cup shape is shape | molded on the welding line of a drum type to-be-tested object by the pressurization of a 1st movable part and a 2nd movable part between a pair of support pillars.

In the present invention, the body portion between the first support portion and the second support portion is provided with a locking bar for fixing the pair of support pillars to the second support portion in the first working position.

In the present invention, the first movable portion is provided between the pair of support pillars, at least one punching protrusion is formed to correspond to the welding line of the drum-shaped object to be measured, and at a predetermined distance from the second support portion at the first working position. A first interview portion is formed spaced apart. At least one groove corresponding to each of the at least one punching protrusions is formed in the second movable part, and the second moving part includes a second interview part pressed against the first interview part with the drum-type object interposed therebetween at the second working position.

In the present invention, each of the pair of support pillars are formed with locking grooves near the end, respectively, and the locking bar is slid to the locking position inserted into the locking grooves at the unlocking position when locking, and the locking grooves at the locking position when unlocking. Slid to the release position to escape from.

In the welding defect inspection method of the present invention, the drum-type object is loaded such that the welding line is positioned on the second support part by inserting the first support part facing the second support part at a predetermined interval inside the drum-type object. After moving the first movable part of the support part to fix the supporting pillars before and after the weld line of the loaded drum-type object, the second movable part of the second support part is moved to press the welding line of the drum-type object under test to the first movable part. The cup shape for welding test is formed.

Welding joint inspection apparatus according to the present invention according to the embodiments of the present invention as described above can have a mechanical structure capable of exerting a sufficient pressing force to support the upper pressing portion inserted into the drum-type to-be-tested portion before and after the drum. It can also reduce the size of the equipment.

However, the effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art without departing from the spirit and scope of the present invention.

1 is a perspective view of a preferred embodiment of a welding defect inspection apparatus 100 according to the present invention.
Figure 2 is a left side view of Figure 1 with the side cover removed.
3 is a right side view of FIG. 1;
4 is a partial side cross-sectional view of FIG. 1 in which the space between the first and second support portions in the first and second standby positions SP1 and SP2 is enlarged;
Fig. 5 is a partial side cross-sectional view of Fig. 1 in which the space between the first and second support portions is enlarged at the first working position WP1;
Fig. 6 is a partial side cross-sectional view of Fig. 1 in which the space between the first support and the second support is enlarged in the second working position WP2;
7 is a view for explaining the operation of the locking bar 150 of FIG.
8 is a view for explaining the cup forming operation of FIG.
9 is a flow chart for explaining the inspection method of the welded joint inspection apparatus according to the present invention.

With respect to the embodiments of the present invention disclosed in the text, specific structural to functional descriptions are merely illustrated for the purpose of describing the embodiments of the present invention, embodiments of the present invention may be implemented in a variety of forms and It should not be construed as limited to the embodiments described in.

As the present invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in the text. However, this is not intended to limit the present invention to a specific disclosure form, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing each of the drawings, similar reference numerals are used for the components.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

When a component is said to be "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that another component may be present in the middle. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between. Other expressions describing the relationship between components, such as "between" and "immediately between" or "neighboring to" and "directly neighboring", should be interpreted as well.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "having" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof that has been described, and that one or more of them is present. It is to be understood that it does not exclude in advance the possibility of the presence or addition of other features or numbers, steps, actions, components, parts or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals are used for the same components in the drawings, and duplicate descriptions of the same components are omitted.

1 is a perspective view of a preferred embodiment of the welding defect inspection apparatus 100 according to the present invention, Figure 2 is a left side view of the side cover of Figure 1 removed, Figure 3 is a right side view of Figure 1, Figure 4 Is a partial side cross-sectional view of FIG. 1 in which the space between the first support portion and the second support portion is enlarged in the first and second standby positions SP1 and SP2, and FIG. 5 shows the first support portion in the first working position WP1 and FIG. 1 is an enlarged partial side cross-sectional view of the space portion between the second support portion, and FIG. 6 is a partially side cross-sectional view of FIG. 1 which enlarges the space portion between the first support portion and the second support portion at the second working position WP2.

Referring to the drawings, the welding defect inspection apparatus 100 is an English letter "F" shaped body body 110, the vertical body and the first support portion 120 and the horizontal horizontal upper portion and the second support portion 130 and the lower horizontal body The third support part 140 is a horizontal body. The third support part 140 is located at the bottom to support the body part 110 in a stand type. The first support part 120 and the second support part 130 have a length longer than the length of the drum-shaped workpiece 10. As shown in the drawing, the drum-shaped measurement object 10 is mounted so that a weld line portion is fitted between the first support part 120 and the second support part 130. Therefore, the first support part 120 is inserted into the internal space from one side of the drum-shaped object 10, the end of which protrudes to the other side of the drum-type object 10. The locking bar 150 is installed at the body 110 between the first support part 120 and the second support part 130. The locking bar 150 protrudes in the horizontal direction in proximity to the second support part 130.

The first movable part 122 is slidably installed on the first support part 120 toward the second support part 130 between the first standby position SP1 and the first working position WP1. The first movable part 122 may be operated by pneumatic pressure, hydraulic pressure, or a servo motor so as to slide along the guide rail formed on the first support part 120. At the lower end of the first movable part 122, a pair of support pillars 122a and 122b are installed at the front and rear at intervals longer than the length of the drum-type object 10. The pair of support pillars 122a and 122b maintain a predetermined distance from the second support portion 130 in the first standby position SP1, and end of the pair of support pillars 122a and 122b at the second support portion 130 in the first working position WP1. Supported. Therefore, in the first support part 120 and the second support part 130, since the support pillars 122a and 122b are moved to the second support part 130 in the cantilever type, their ends are supported by the second support part 130. In the working position WP1 as a whole, the first support portion 120 and the second support portion 130 are supported by a pair of support pillars 122a and 122b in a "P" shape. Therefore, a high pressure can be stably applied to the welding line of the drum-shaped object 10 positioned between the first support part 120 and the second support part 130. First locking grooves LH1a and LH1b are formed on side surfaces near the end of each of the support pillars 122a and 122b.

Six punching machines 122c are arranged in the front-rear direction (the longitudinal direction of the first support part 120) in the first movable part 122 between the pair of support pillars 122a and 122b. Here, the number of punching machines 122c is an example and may be arranged in various numbers. Each of the punching machines 122c may be operated by a servomotor to adjust the protruding length of the punching protrusion. The first interview part 122d is installed at the lower end of the first movable part 122. Six guide holes HL are formed in the first interview portion 122d respectively corresponding to the punching protrusions of the punching machines 122c. Therefore, the punching protrusions can be moved to protrude toward the second support portion 130 through the guide hole. In other words, in forming six cups in the welding line, the depth of the cup can be adjusted to a desired size by setting the depth of the cup by the protruding length of the punching protrusion. At a work position WP1, a predetermined work interval S1 is maintained between the first interview portion 122d and the first support portion 130.

The second movable part 132 is slidably installed on the second support part 130 toward the first support part 120 between the second standby position SP2 and the second working position WP2. The second movable part 132 may be operated by pneumatic pressure, hydraulic pressure, or a servo motor to slide along the guide rail formed on the second support part 130. A pair of guide grooves 130a and 130b are formed near both ends of the second movable portion 132 of the second support portion 130 and respectively correspond to the first support portions 130 in the pair of guide grooves 130a and 130b. Support pillars 122a and 122b of 120 are inserted. Second locking grooves LH2a and LH2b are formed on side surfaces of the guide grooves 130a and 130b, respectively. The first locking grooves LH1a and LH1b and the second locking grooves LH2a and LH2b are aligned at the first work position WP1. When the locking bars 150 are inserted along the aligned first locking grooves LH1a and LH1b and the second locking grooves LH2a and LH2b, the support pillars 122a and 122b are locked to the second support 130. . The second interview part 132a facing the first interview part 122d of the first support part 120 of the second movable part 132 is installed. Six molding grooves CUP are formed in the second interview portion 132a. The forming grooves CUP are disposed at positions corresponding to the six guide holes HL of the first interview portion 122d, respectively. Therefore, as the punching protrusions are inserted into the forming grooves CUP at the second working position WP2, the cups are formed on the welding line of the drum-type measurement object 10.

7 is a view for explaining the operation of the locking bar 150 of FIG.

Referring to FIG. 7, the locking bar 150 is installed in the body 110 to be slidable in the front-rear direction. The locking bar 150 may be operated by a movable part 152 such as pneumatic, hydraulic or servo motor to slide along the guide rail formed in the body 110. The locking bar 150 has a Y-shaped or a tuning fork shape, and the first and second branch portions 156 and 158 extending in a U shape at the end of the root portion 154 installed in the body portion 110 have a second movable portion 132. It is installed to be slidable. Therefore, the guide grooves 130a and 130b and the second interview portion 132a are positioned in the space surrounded by the U shape. Each of the first and second branch portions 156 and 158 has terminal protrusions 156a and 158a and locking jaws 156b and 158b. The terminal protrusions 156a and 158a face each other and face each other and face toward the corresponding second locking groove LH2a of the guide groove 130a. The locking jaws 156b and 158b are formed to slide in the corresponding second locking grooves LH2b of the guide grooves 130b, respectively. As shown in the figure, in the unlocking position, the terminal protrusions 156a and 158a and the locking projections 156b and 158b are positioned at the position UL separated from the corresponding second locking grooves LH2a and LH2b. When the support pillars 122a and 122b are inserted into the guide grooves 130a and 130b, the root portion 154 is moved by the movable portion 152 of the locking portion 150, and the branch portions 156 and 158 are slid, thereby sliding the second portion. The insertion protrusions 156a and 158a and the locking projections 156b and 158b are inserted into the first locking grooves LH1a and LH1b while being inserted into the locking grooves LH2a and LH2b. Therefore, the support columns 122a and 122b are locked and supported by the second support 130 by the locking bar 150. Therefore, when the second movable part 132 presses the first interview part 122d, it can withstand a large pressure. Therefore, it is possible to maintain a mechanical strength capable of withstanding high pressure while clamping a large measured object such as the drum-type measured object 10 into a clamping structure of a relatively small size.

8 is a view for explaining the cup forming operation of Figure 1, Figure 9 is a flow chart for explaining the inspection method of the weld joint inspection apparatus according to the present invention.

Referring to the drawings, when the position is located at the first work position WP1 of the first movable part 122, the punching protrusion of the punching machine 122c is protruded through the guide hole HL of the first interview part 122d. maintain. The protruding length of the punching protrusion sets the degree of tensile force of the weld line by cup forming. Here, the drum-type object 10 is loaded into the inspection apparatus 100 so that the weld line is positioned in the second support part 130 by loading the first support part 120 into the drum-type object 10. (S100). In this state, the support pillar 122b is locked to be fixed to the second support 130 by the locking bars 156 and 158 (S102). Subsequently, the second movable part 132 moves from the second standby position SP2 toward the first support part 120 while pushing the welding line of the drum-shaped object 10 to the punching protrusion to the second working position WP2. Upon reaching, a cup shape is formed on the welding line of the drum-shaped object 10 (S104). Subsequently, the drum-shaped object 10 is unloaded in the reverse order (S106).

Therefore, the welding defect is detected by detecting the light leakage of the cup-shaped portion or vision inspection.

As described above with reference to the accompanying drawings for the preferred embodiment of the present invention, the present invention is not limited by the above-described specific embodiments, those of ordinary skill in the art It is apparent that various modifications and changes can be made without departing from the spirit and scope of the appended claims.

10: drum type measurement object
100: welding defect inspection device
110: body
120: first support
122: first moving part
122a, 122b: support pillar
122c: Punching Machine
122d: first interview part
130: second support
130a, 130b: guide groove
132: second moving part
132a: paper joint
140: third support
150: locking bar
152: movable part
154: root
156, 158 branches
156a, 158a: termination detector
156b, 158b: Jamming Jaw
SP1: first standby position
SP2: Second Standby Position
WP1: 1st working position
WP2: 2nd working position
LH1a, LH1b: First Locking Groove
LH2a, LH2b: Second Locking Groove

Claims (5)

A body part having a first support part and a second support part integrally formed at regular intervals;
A first movable part slidably installed in the first support part and moving between a first standby position and a first work position between the first support part and the second support part;
The first movable parts are respectively provided at intervals longer than the length of the drum-type object to be measured, the first waiting position is maintained at a predetermined distance from the second support portion, and the end is supported by the second support portion at the first working position. A pair of support columns; And
A second movable part slidably installed between the pair of support pillars, the second movable part moving between a second standby position and a second working position between the first support part and the second support part,
The welding defect inspection apparatus which forms a cup shape on the welding line of a drum-type to-be-tested object by the pressurization of a 1st movable part and a 2nd movable part between the said pair of support columns. According to claim 1, wherein the body portion between the first support and the second support portion
Weld defect inspection apparatus is provided with a locking bar for fixing the pair of support pillars to the second support in the first working position. The method of claim 1, wherein the first movable part
At least one punching protrusion formed between the pair of supporting pillars, the at least one punching protrusion formed to correspond to the welding line of the drum-type object, and spaced apart from the second supporting portion at a predetermined distance from the first working position; 1 interview part is formed,
At least one groove corresponding to each of the at least one punching protrusion is formed in the second movable part, and the second pressurized part is pressed against the first interview part with the drum-shaped object under test at the second working position. Welding defect inspection device provided with an interview portion. According to claim 2, Each of the pair of support pillars are each formed with locking grooves near the end,
And the locking bar slides from a release position to a locking position inserted into the locking grooves when locked, and slides to a release position deviated from the locking grooves from the locking position when the locking bar is released. Inserting a first support part facing the second support part at a predetermined interval inside the drum-type object to load the drum-type object such that a weld line is positioned on the second support part;
Moving the first movable part of the first support part to fix the support pillars before and after the weld line of the loaded drum-shaped object to be measured; And
And moving the second movable part of the second support part to press the welding line of the drum-type object to be welded to the first movable part to form a cup shape for weld joint inspection on the welding line.

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