阅读说明：本技术 焊接装置 (Welding device ) 是由 高田悠大 于 2019-03-01 设计创作，主要内容包括：焊接装置对在上下开口的圆筒状的密闭容器主体的上下嵌合有密闭容器上盖和密闭容器下盖而构成的密闭容器的上部嵌合部和下部嵌合部进行电弧焊接。焊接装置具备：进行电弧焊接的两根焊枪；旋转机构,其使两根焊枪沿密闭容器主体的周向旋转；以及主体保持机构,其保持密闭容器中的密闭容器主体部分。焊接装置用旋转机构使两根焊枪沿密闭容器主体的周向旋转,同时对用主体保持机构保持的密闭容器主体的上部嵌合部和下部嵌合部分别进行电弧焊接。(The welding device performs arc welding on an upper fitting portion and a lower fitting portion of a sealed container, which is formed by fitting an upper sealed container cover and a lower sealed container cover to the upper and lower sides of a cylindrical sealed container body having an upper opening and a lower opening. The welding device is provided with: two welding guns for arc welding; a rotating mechanism which rotates the two welding guns along the circumferential direction of the closed container main body; and a main body holding mechanism that holds a main body portion of the closed casing in the closed casing. The welding device performs arc welding on the upper fitting portion and the lower fitting portion of the sealed container body held by the body holding mechanism, while rotating the two welding guns in the circumferential direction of the sealed container body by the rotating mechanism.)

1. A welding device for arc welding an upper fitting portion and a lower fitting portion of a sealed container, which is formed by fitting an upper sealed container lid and a lower sealed container lid to the upper and lower sides of a cylindrical sealed container body having upper and lower openings, the welding device comprising:

two welding guns for arc welding;

a rotation mechanism that rotates the two welding guns in the circumferential direction of the closed container main body; and

a main body holding mechanism that holds the main body portion of the closed vessel in the closed vessel,

the two welding guns are rotated in the circumferential direction of the sealed container body by the rotating mechanism, and arc welding is performed on the upper fitting portion and the lower fitting portion of the sealed container body held by the body holding mechanism.

2. Welding device according to claim 1,

the body holding mechanism holds the closed vessel body during a period from the start of welding to the completion of welding for at least half a cycle.

3. Welding device according to claim 1 or 2,

and an adjustment mechanism that is connected to the rotation mechanism and that individually adjusts the welding target positions of the two welding guns.

4. Welding device according to any one of claims 1 to 3,

the welding device is provided with a transfer robot for transferring the sealed container main body from a device in a previous step to a welding device, and the transfer robot is provided with the main body holding mechanism.

Technical Field

The present invention relates to a welding apparatus for welding a sealed container of a sealed compressor used for a cooling/heating apparatus, a hot water supply apparatus, or the like.

Background

The closed container of the closed compressor comprises: a cylindrical sealed container body with an upper opening and a lower opening, a sealed container upper cover embedded on the upper part of the sealed container body, a sealed container lower cover embedded on the lower part of the sealed container body, and a mounting leg mounted on the bottom surface of the sealed container lower cover are arranged.

The sealed container is constructed by welding an upper fitting portion of the sealed container body and the upper cover of the sealed container and a lower fitting portion of the sealed container body and the lower cover of the sealed container by welding means, respectively.

As a welding apparatus for welding an upper fitting portion and a lower fitting portion of a sealed container, there is a technology in which the sealed container in a state in which an upper lid and a lower lid of the sealed container are fitted to upper and lower portions of a sealed container main body is rotated by a rotary table and the upper fitting portion and the lower fitting portion are welded, respectively (for example, see patent document 1). In patent document 1, by welding the upper fitting portion and the lower fitting portion at the same time, the posture of the sealed container does not need to be changed such as the reverse rotation and the side rotation at the time of welding, and the sealed container can be assembled at low cost and with high accuracy.

Patent document 1: japanese patent laid-open publication No. 2004-162657

In the case of patent document 1, when welding the upper fitting portion and the lower fitting portion, the rotary table rotates the hermetic container itself. Therefore, the sealed container body may be inclined with respect to the sealed container lower cover by sliding between the sealed container lower cover mounted on the rotary table and the sealed container body fitted on the sealed container lower cover. If the sealed container body is welded while being kept inclined, there is a problem that the quality of the welded portion is degraded.

Disclosure of Invention

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a welding apparatus capable of simultaneously welding an upper fitting portion and a lower fitting portion of a sealed container main body and suppressing inclination of the sealed container main body during welding to obtain a welded portion with good quality.

The welding device of the present invention is a welding device for arc welding an upper fitting portion and a lower fitting portion of a closed container, which is configured by fitting an upper closed container lid and a lower closed container lid to the upper and lower sides of a cylindrical closed container body having an upper opening and a lower opening, the welding device including: two welding guns for arc welding; a rotating mechanism which rotates the two welding guns along the circumferential direction of the closed container main body; and a main body holding mechanism for holding a main body part of the sealed container in the sealed container, rotating the two welding guns along the circumferential direction of the sealed container main body by using the rotating mechanism, and simultaneously performing arc welding on the upper embedding part and the lower embedding part of the sealed container main body held by the main body holding mechanism.

According to the present invention, since the upper fitting portion and the lower fitting portion of the sealed container body can be welded at the same time by rotating the two welding guns in the circumferential direction of the sealed container body by the rotating mechanism, and the sealed container body is held by the body holding mechanism during welding, inclination of the sealed container body during welding can be suppressed, and a welded portion with good quality can be obtained.

Drawings

Fig. 1 is a schematic cross-sectional view of a hermetic compressor to be welded by a welding apparatus according to embodiment 1 of the present invention.

Fig. 2 is an enlarged view of a portion surrounded by a broken line a in fig. 1.

Fig. 3 is an enlarged view of a portion surrounded by a broken line B in fig. 1.

Fig. 4 is a configuration diagram of a welding apparatus according to embodiment 1 of the present invention.

Fig. 5 is an explanatory diagram of a positional relationship between the welding wire and the inclined surface of the lower fitting portion in the welding device according to embodiment 1 of the present invention.

Fig. 6 is an explanatory diagram of a welding target position of the welding wire in the welding device according to embodiment 1 of the present invention.

Fig. 7 is a process flow showing the operation of the welding apparatus according to embodiment 1 of the present invention.

Fig. 8 is a schematic cross-sectional view of the lower lid of the closed casing held by the leg holding mechanism of the welding apparatus according to embodiment 1 of the present invention.

Fig. 9 is a view showing the sealed container main body in a state where the sealed container upper lid is fitted to the upper opening, which is carried by the carrying robot of the welding apparatus according to embodiment 1 of the present invention.

Fig. 10 is a plan view of a state in which a transfer robot grips a sealed container main body in a welding apparatus according to embodiment 1 of the present invention.

Fig. 11 is a plan view of the welding apparatus according to embodiment 1 of the present invention, in which the transfer robot is released from the sealed container main body and retracted.

Detailed Description

Before describing the welding apparatus according to the embodiment of the present invention, a hermetic compressor including a hermetic container to be welded will be described below.

Embodiment mode 1

Fig. 1 is a schematic cross-sectional view of a hermetic compressor to be welded by a welding apparatus according to embodiment 1 of the present invention.

In fig. 1, a sealed container 2 of a sealed compressor 1 includes: a cylindrical sealed container body 2a having an upper and lower opening, a disk-shaped sealed container upper lid 2b fitted to an upper opening of the sealed container body 2a, and a disk-shaped sealed container lower lid 2c fitted to a lower opening of the sealed container body 2a are provided. A mounting leg 2d is attached to the bottom surface of the lower cover 2c of the closed casing. In the sealed container 2, if the sealed container main body 2a is inclined with respect to the installation surface defined by the installation legs 2d, vibration and noise may be caused. Therefore, the hermetic compressor 1 is used in a posture in which the sealed container main body 2a stands vertically with respect to the installation surface.

The closed container body 2a is internally provided with: a compression mechanism 3 for compressing a refrigerant, and a motor 4 for driving the compression mechanism 3. The motor 4 includes: a rotor 4a connected to the crankshaft 5 and transmitting a rotational force from the crankshaft 5 to the compression mechanism 3, and a stator 4 b.

In the above configuration, the mounting surface 6 of the mounting leg 2d to the lower cover 2c of the closed casing has a disk shape, and the bottom surface of the lower cover 2c of the closed casing has a disk shape along the mounting surface 6. Thus, the mounting legs 2d are welded in a state where the mounting surface 6 is in close contact with the bottom surface of the lower cover 2c of the closed casing.

Fig. 2 is an enlarged view of a portion surrounded by a broken line a in fig. 1.

Inclined surfaces 10 having the same inclination angle are formed at the lower portion of the main body 2a of the closed casing and the opening end portion of the lower cover 2c of the closed casing as shown in fig. 2. The inclined surface 10 is an inclined surface inclined upward from the inner peripheral side to the outer peripheral side of the closed casing 2, and an inclination angle b (see fig. 5 described later) is formed to be, for example, 15 ° to 25 °. The inclined surface 10 is formed over the entire circumference of the closed casing main body 2a and the closed casing lower cover 2 c. The sealed container main body 2a and the sealed container lower lid 2c are fitted to each other by pressing the portion of the inclined surface 10.

In this way, the fitting portion (hereinafter, referred to as a lower fitting portion 11) between the main body 2a of the closed casing and the lower cover 2c of the closed casing is formed into the inclined surfaces 10 having the same inclination angle from the inner circumferential side to the outer circumferential side of the closed casing 2, so that the fitting amount thereof is secured and the coaxiality between the central axis of the main body 2a of the closed casing and the central axis of the lower cover 2c of the closed casing is secured. By ensuring the coaxiality, vibration and noise of the hermetic compressor 1 can be suppressed.

Fig. 3 is an enlarged view of a portion surrounded by a broken line B in fig. 1.

A projection 12 for limiting the depth of insertion of the upper lid 2b into the main body 2a of the closed casing is formed on the outer peripheral surface of the upper lid 2b of the closed casing. As shown in fig. 3, the protrusion 12 protrudes outward from the outer peripheral surface of the upper lid 2b of the closed casing. The upper lid 2b of the closed casing is inserted into the closed casing main body 2a until the protrusion 12 comes into contact with the upper end of the closed casing main body 2a, and is pressurized in this state to be fitted. In addition, the mounting accuracy of the closed vessel upper cover 2b and the closed vessel main body 2a does not contribute to the vibration and noise of the hermetic compressor 1. Therefore, the protrusion 12 is used instead of the inclined surface 10 in the fitting portion (hereinafter, referred to as an upper fitting portion 13) between the upper lid 2b of the closed casing and the main body 2a of the closed casing.

The closed casing 2 is welded by arc welding to the entire circumference of each of the lower fitting portion 11 and the upper fitting portion 13 by two welding guns of a welding apparatus described below.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 4 is a configuration diagram of a welding apparatus according to embodiment 1 of the present invention. In fig. 4, the x-axis refers to the lateral direction and the y-axis refers to the longitudinal direction. Fig. 5 is an explanatory diagram of a positional relationship between the welding wire and the inclined surface of the lower fitting portion in the welding device according to embodiment 1 of the present invention. Fig. 6 is an explanatory diagram of a welding target position of the welding wire in the welding device according to embodiment 1 of the present invention.

The welding device is provided with: two welding guns 20a and 20b for performing arc welding, a moving mechanism 30, a mounting table 70, a lower cover holding mechanism 80, a transfer robot 90, and a control device 100.

The workpiece to be processed by the welding apparatus according to embodiment 1 is the sealed container 2 described above, and the lower fitting portion 11 and the upper fitting portion 13 are welded by the welding gun 20a and the welding gun 20b, respectively.

Hereinafter, each component constituting the welding apparatus will be described.

Welding torch 20a and welding torch 20b send welding wire 21 from the tip toward the welding target position, and weld the welding portion by arc welding. When welding the lower fitting portion 11, which is one of the welding portions in embodiment 1, welding is performed by adjusting the target angle c of the welding wire 21 within the range of the adjustment amount d with respect to the inclination angle b of the inclined surface 10 of the lower fitting portion 11. Here, the target angle c is an angle formed by the welding wire 21 and the side surface of the closed casing main body 2 a.

The moving mechanism 30 is a mechanism for moving the welding guns 20a and 20 b. The moving mechanism 30 includes a rotating mechanism 40, a traverse cylinder 50, and an independent adjusting mechanism 60.

The rotation mechanism 40 is a mechanism that rotates the welding torch 20a and the welding torch 20b in the circumferential direction of the sealed container body 2 a. The rotation mechanism 40 includes: a single rotating main shaft 41 that rotates about an axial center extending in the y-axis direction, a single rotating sub-shaft 42 that is provided orthogonally to the rotating main shaft 41, and a drive unit 43 that drives the rotating main shaft 41. The drive unit 43 includes a rotary motor 43a for transmitting a rotational force to the rotary spindle 41, and a power transmission mechanism (not shown).

The traverse cylinder 50 reciprocates the rotation mechanism 40 in the x direction. The traverse cylinder 50 is connected to the drive unit 43 and moves to a welding position (position shown in fig. 1) where the rotary spindle 41 is positioned on the central axis O of the closed casing 2 and an origin position where the rotary spindle 41 is set on the negative side of the x-axis.

The independent adjustment mechanism 60 is a mechanism that is coupled to the rotation sub-shaft 42 of the rotation mechanism 40 and independently adjusts the welding target positions of the welding guns 20a and 20 b. The independent adjustment mechanism 60 includes: a first mechanism 61a for adjusting the position of the welding torch 20a, and a second mechanism 61b for adjusting the position of the welding torch 20 b. The first mechanism 61a and the second mechanism 61b can operate independently.

The first mechanism 61a includes: an in-plane position adjusting mechanism 62 that adjusts a horizontal position x and a vertical position y from a welding target position; and an angle adjusting mechanism 63 for adjusting a target angle c with respect to the welding target position. The second mechanism 61b has the same configuration and includes an in-plane position adjustment mechanism 62 and an angle adjustment mechanism 63.

The in-plane position adjustment mechanism 62 is a mechanism capable of moving the rod-shaped moving member 62a in the x-direction and the y-direction with respect to the rotary sub-shaft 42. The angle adjustment mechanism 63 is a mechanism that rotatably supports a rod-shaped rotating member 63a coupled to the lower end of the moving member 62a so that the distal end of the rotating member 63a moves up and down. The welding torch is connected to the tip end of the rotating member 63a, and the angle adjusting mechanism 63 adjusts the target angle c of the welding torch by the rotational position of the rotating member 63 a.

In the first mechanism 61a and the second mechanism 61b configured as described above, the first mechanism 61a is connected to the inside of the rotary counter shaft 42, and the second mechanism 61b is connected to the outside of the rotary counter shaft 42. Then, the upper fitting portion 13 is welded by the welding gun 20a connected to the first mechanism 61a, and the lower fitting portion 11 is welded by the welding gun 20b connected to the second mechanism 61 b.

The lower cover holding mechanism 80 is disposed on the mounting table 70 and fixedly supports the workpiece. The lower lid holding mechanism 80 has a structure in which three support columns 82 extending in the y direction on the base 81 are erected at intervals varying concentrically, and each support column 82 holds the lower lid 2c of the closed vessel by passing through three through holes provided in the mounting leg 2d of the closed vessel 2.

The transfer robot 90 includes a main body holding mechanism 91 that holds the sealed container main body 2a at the tip of the arm. The transfer robot 90 holds the sealed container body 2a by the body holding mechanism 91, and transfers the sealed container body 2a from the apparatus in the previous step to the lower lid holding mechanism 80 of the welding apparatus. The main body holding mechanism 91 is constituted by a holding jig for holding the sealed container main body 2a so as to sandwich the sealed container main body from the periphery, and holds the sealed container main body 2a in a predetermined holding posture. The predetermined holding posture is a posture based on the upper surface of the base 81, that is, a posture in which the closed casing main body 2a stands upright vertically with respect to the installation surface of the installation leg 2 d. The holding posture is recorded in the internal memory of the control device 100 in advance. By controlling the holding posture of the sealed container body 2a in this way, the verticality of the sealed container body 2a with respect to the mounting legs 2d can be ensured when the sealed container body 2a is carried by the carrying robot 90 to be fitted to the sealed container lower lid 2 c. In addition, although the holding jig is used as the main body holding mechanism 91, the holding jig is not limited to this, and may be any mechanism as long as it can hold the closed casing main body 2 a.

The control device 100 is a device for controlling the entire welding apparatus, and is constituted by a microprocessor unit or the like, for example. The configuration of the control device 100 is not limited to this. For example, the device may be configured by a device such as firmware that can be updated. The control device 100 may be a program module that is executed by an instruction from a CPU or the like, not shown.

Fig. 7 is a process flow showing the operation of the welding apparatus according to embodiment 1 of the present invention. Fig. 8 is a schematic cross-sectional view of a lower lid of a closed casing held by a leg placement holding mechanism of a welding apparatus according to embodiment 1 of the present invention. Fig. 9 is a view showing the sealed container main body in a state where the sealed container upper lid is fitted to the upper opening, which is carried by the carrying robot of the welding apparatus according to embodiment 1 of the present invention. Fig. 10 is a plan view of a state in which a transfer robot grips a sealed container main body in a welding apparatus according to embodiment 1 of the present invention. Fig. 11 is a plan view of the welding apparatus according to embodiment 1 of the present invention, in which the transfer robot is released from the sealed container main body and retracted.

The sealed container lower lid 2c is carried into the welding apparatus by a conveying apparatus (not shown) and attached to the lower lid holding mechanism 80 (step 1). Next, as shown in fig. 4 and 10, the main body holding mechanism 91 of the transfer robot 90 clamps the sealed container main body 2a to which the sealed container upper lid 2b is fitted as shown in fig. 9 (step 2). At this time, the main body holding mechanism 91 of the transfer robot 90 grips the central portion of the sealed container main body 2a so as to stably hold the sealed container main body 2 a. Then, the transfer robot 90 transfers the sealed container body 2a clamped by the body holding mechanism 91 from the previous step to the upper portion of the sealed container lower lid 2c inside the welding apparatus (step 3). At this time, the welding guns 20a and 20b are positioned at the origin by the traverse cylinder 50.

Next, the transfer robot 90 lowers the sealed container main body 2a and fits it to the upper portion of the sealed container lower lid 2c (step 4). Since the lower fitting portion 11, which is a fitting portion between the lower portion of the sealed container main body 2a and the opening end portion of the sealed container lower lid 2c, is formed as the inclined surface 10 inclined at the same inclination angle as described above, the inclined surfaces 10 are fitted to each other in close contact. By fitting the sealed container main body 2a and the sealed container lower lid 2c by the transfer robot 90 in this way, the sealed container main body 2a can be fitted while ensuring the perpendicularity with respect to the mounting legs 2d as described above.

Next, the welding apparatus operates the moving mechanism 30 to adjust the welding target positions of the two welding guns 20a and 20b (step 5). Specifically, the welding apparatus performs the movement of each welding torch to the welding position by the traverse cylinder 50 and the adjustment of the x-direction, the y-direction, and the target angle c of each welding torch by the independent adjustment mechanism 60.

Next, the welding apparatus starts welding in a state where the holding transfer robot 90 clamps the sealed container body 2 a. That is, the welding apparatus rotates the rotation spindle 41 of the rotation mechanism 40, rotates the welding guns 20a and 20b in the circumferential direction by, for example, 210 ° out of 360 ° in one rotation with respect to the lower fitting part 11 and the upper fitting part 13 (step 6), and performs arc welding. Then, at the time point when the welding guns 20a and 20b have rotated 210 °, the welding apparatus releases the clamping of the closed container body 2a by the transfer robot 90, and retracts the transfer robot 90 out of the rotation orbit f of the welding guns as shown in fig. 11 (step 7). This retreat is for preventing the transfer robot 90 from interfering with the welding guns 20a and 20b when the welding guns 20a and 20b weld the remaining portions.

Then, the welding apparatus rotates the welding torch 20a and the welding torch 20b to 360 °, and arc-welds the remaining portions (step 8). After the welding is completed, the welding apparatus moves the welding guns 20a and 20b to the original position by the traverse cylinder 50 (step 9).

In step 6, the sealed container body 2a is clamped by the transfer robot 90 until the welding torch rotates by 210 °, but the sealed container body 2a is clamped during a period from the start of welding to 180 ° of at least half of a rotation. This can prevent the sealed container body 2a from tilting due to deformation caused during welding.

As described above, the welding device according to embodiment 1 includes: two welding guns 20a and 20 b; a rotation mechanism 40 that rotates the two welding guns 20a and 20b in the circumferential direction of the closed casing main body 2 a; and a main body holding mechanism 91 that holds a part of the closed casing main body 2a in the closed casing 2. The welding apparatus according to embodiment 1 performs arc welding on the upper fitting portion 13 and the lower fitting portion 11 of the sealed container body 2a held by the body holding mechanism 91 while rotating the two welding guns 20a and 20b in the circumferential direction of the sealed container body 2a by the rotating mechanism 40. This enables the lower fitting portion 11 and the upper fitting portion 13 of the closed casing 2 to be welded at the same time. Further, since the lower fitting portion 11 and the upper fitting portion 13 of the sealed container main body 2a can be welded simultaneously by rotating each welding gun, it is possible to prevent the sliding of the fitting portion between the sealed container main body 2a and the sealed container lower lid 2c, which occurs when the sealed container 2 itself is rotated and welded. As described above, the inclination of the sealed container body 2a during welding can be suppressed, and a weld portion with good quality can be obtained. As a result, the performance of the hermetic compressor can be improved.

The main body holding mechanism 91 according to embodiment 1 holds the closed casing main body 2a during a period from the start of welding to the completion of welding for at least half of a cycle. This can prevent inclination of the sealed container body 2a due to deformation occurring during welding.

The welding apparatus according to embodiment 1 includes an independent adjustment mechanism 60 that is connected to the rotation mechanism 40 and that individually adjusts the welding target positions of the two welding guns 20a and 20 b. This enables the welding target positions of the welding guns 20a and 20b to be adjusted individually.

Further, the transfer robot 90 is provided to transfer the sealed container body 2a onto the mounting table 70 from the previous step, and the transfer robot 90 is provided with a body holding mechanism 91. This can simplify the structure as compared with the case where the transfer robot 90 and the main body holding mechanism 91 are separately configured.

Description of the reference numerals

1 … hermetic compressor; 2 … sealing the container; 2a … sealing the container body; 2b … sealing the upper cover of the container; 2c … sealing the lower cover of the container; 2d … mounting legs; 3 … compression mechanism; 4 … electric motor; 4a … rotor; 4b … stator; 5 … crankshaft; 6 … mounting surface; 10 … inclined plane; 11 … lower fitting part; 12 … protrusions; 13 … upper fitting part; 20a … torch; 20b … welding torch; 21 … welding wire; 30 … moving mechanism; a 40 … rotation mechanism; 41 … rotating the main shaft; 42 … rotating the countershaft; 43 … drive unit; 43a … rotary motor; 50 … transverse cylinders; 60 … independent adjustment mechanisms; 61a … first mechanism; 61b … second mechanism; 62 … in-plane position adjustment mechanism; 62a … moving parts; 63 … an angle adjustment mechanism; 63a … rotating component; 70 … mounting table; 80 … a lower lid retention mechanism; 81 … stand-off; 82 … a support post; 90 … transfer robot; 91 … main body holding mechanism; 100 … control the device.