JPH04104280U - spot welding machine - Google Patents

Abstract

(57) [Summary] [Purpose] Conventional spot guns lack ease of operation of spot welding machines and smooth movement of the spot gun. [Structure] A rod 51 made of a conductive material and passing through the tip of the movable arm 15 in the vertical direction, a rod-side contact portion 52 provided in a brim shape around a position above the movable arm 15 of the rod 51, and the movable arm side 15. , the rod side contact part 5
2. An arm-side contact portion 5 installed opposite to the lower side of the rod 51 and insulated from the rod 51 and connected to the other electrode.
3, an elevating means 61 for vertically moving the rod 51, an outer cylinder 69 provided from the elevating means 61 around the lower rod, and a spot gun 41 installed at the lower end of the outer cylinder 69.
and a spot gun side contact portion 45 which is provided on the spot gun 41 facing the rod lower portion 51 and is connected to the tip.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a spot welding machine.

0002

[Conventional technology]

As a spot welding machine, the inventor has already published ``Spot Japanese Patent Application No. 1983-93156 “Spot Gun”, Japanese Patent Application No. 1-247240 “ ``Spot Gun'', Patent Application 1986-323908 ``Spot Gun'', Actual Application 1987-323908 221 "spot gun" etc. These spot guns The gun body is installed on the work surface and has a welding tip for spot welding at the tip, and the bottom The spot gun support column that supports the gun body at the bottom and the top of the spot gun support column. The support strut operating section that supports the supporting strut operating section, and the support strut operating section that supports the supporting strut operating section at the tip. It consists of a support arm movable in a horizontal direction.

0003 On the other hand, this type of spot gun or spot welding machine is shown in Figure 8. A spot welding machine as shown is known. That is, it can be moved horizontally. A spot gun support column 102 is attached vertically to the tip of a movable arm 101. The spot gun support column 102 and the upper part of the movable arm 101 are equipped with a strip. An air cylinder 104 that drives the pot gun support column 102 up and down is attached. , the middle part of the spot gun 103 and the spot gun support strut. 102 means rod 1 05, and the spot gun 103 and one of the electrodes of the transformer are connected to each other. They are connected by a cable 106. The other electrode of the transformer is connected to a working surface 10 made of a copper plate. Connected to 7.

0004 Then, the movable arm 101 is moved in the horizontal direction, and the spot gun support column 102 is moved in the horizontal direction. As the cable 106 moves vertically, the cable 106 moves vertically and horizontally.

[0005]

[Problem that the idea aims to solve] However, in conventional spot guns, spot welders, etc., the cable 106 moves following the movement of the spot gun support column 102 and the movable arm 101. On the other hand, the cable itself must be bent to ensure strength. It is necessary to make the spot welding machine easy to operate, and the spot gun smooth. I had a problem with lack of mobility.

[0006]

[Means to solve the problem]

This idea consists of a work surface installed at the bottom of the spot gun and connected to one of the electrodes. , a movable arm that can move horizontally on the work surface, and a movable arm made of conductive material. The rod that passes through the tip of the arm in the vertical direction, and the area above the movable arm of the rod. The rod side contact part is provided in the shape of a brim, and the rod side contact part on the lower side is on the movable arm side. The electrode is placed opposite to the rod, insulated from the rod, and connected to the other electrode. The contact part on the arm side, the lifting means for moving the rod up and down, and the lower rod from the lifting means. There is an outer cylinder installed around the pad, and a tip installed at the bottom end of the outer cylinder. There is a spot gun that is mounted on the rod, and a spot gun that is mounted on the spot gun opposite the bottom of the rod. and a contact part on the spot gun side connected to the tip. Solve the conventional problems by providing a welding machine.

[0007]

[Effect]

Move the spot gun horizontally to the weld location. Then, operate the lifting means and lower the rod. Then, the rod tip will come into contact with the contact part on the spot gun side. When the rod is further lowered, the tip at the tip of the spot gun is pushed toward the work surface. . At the same time, by lowering the rod of the lifting means, the rod side contact part and the arm side contact part are connected. is contacted. Therefore, when energized, the rod side contact part and the arm side contact part are connected. The tip of the rod is in contact with the contact part on the spot gun side, so the tip is Welding work is performed on the workpiece placed on the work surface by energizing the cup and the work surface. It will be done.

[0008]

【Example】 Figure 1 shows a plan view of an embodiment of this invention, and the connection between the fixed arm and movable arm. Fig. 2 showing a partially enlarged front view of the section, Fig. 3 showing a partially enlarged view of Fig. 2, and other embodiments. Figure 4 shows a plan view of the fixed arm and movable arm of the embodiment illustrated in Figure 4. Figure 5 shows a partially enlarged front view of the connection part, and a partially enlarged cross-section of the rod and spot gun part. Figure 6, Figure 7, Figure 8 showing the surface, movable arm, rod, part of the spot gun part Figure 9 shows an enlarged front view of the movable arm, rod, and spot gun of another embodiment. The description will be made with reference to FIG. 10, which shows a partially enlarged front view.

[0009] 11 is a work surface. The work surface 11 is made of a copper plate and is covered with a conductive material. A workpiece such as a metal box-like object can be installed. The work surface 11 is tilted It may also have a tilt mechanism for this purpose. 12 is a transformer, one of the electrodes is grounded One end is connected to the work surface 11, and the other end is connected to the spot gun 41. 13 is the support It is a supporting post and supports a spot gun or the like so as to be positioned on the work surface 11. 1 4 and 15 are support arms. 14 of the support arms are fixed arms, 15 are possible It is a moving arm. The support arms 14 and 15 are rotatably connected at each arm fixing part 21. The end of the support arm is connected to the work surface by forming a kind of cantilever. It is freely movable in the XY axis directions of 11. The arm fixing part 21 is shown in FIG. The ends of each support arm 14 and 15 are overlapped so that the rotation shaft 22 passes through the support arms 14 and 15. . 23 is a bearing installed between the rotating shaft 22 and the support arm. Ah The arm fixing portion is similarly installed between the movable arms 15, 15.

0010 31 and 32 are sprockets. The rotating shaft side sprocket 31 is connected to the rotating shaft 22 It is attached to one end of the movable arm 15 and integrally attached to the movable arm 15 side. solid The fixed arm side sprocket 32 is a fixed arm that is rotatable about its rotation axis. mounted on the frame 14. 33 is a chain. The chain 33 rotates It is stretched between the shaft side sprocket 31 and the fixed arm side sprocket 32. 34 is an air cylinder. The air cylinder 34 is an air cylinder by introducing air. One of the pistons 35a and 35b protruding from both ends of the cylinder 34 is selected to expand and contract. let Air cylinder 34 is installed in the middle of chain 33, and pistons 35a, 3 5b are attached to both ends of the chain 33, so that they can be connected to the chain 33. Both are connected in a ring. In this embodiment, the auxiliary drive means A includes the sprocket 31 , 32, a chain 33, and an air cylinder 34. Air cylinder 34 Instead, the auxiliary drive means A is driven using air, hydraulic pressure (oil, water), etc. Good too.

[0011] In this embodiment, an auxiliary drive means A is provided between the movable arm 15 and the fixed arm 14. , B were installed, but auxiliary drive means A and B were installed between the movable arms 15 and 15. Good too.

0012 41 is a spot gun. The spot gun 41 has a rod shape as a whole. It has a welding tip 42 at its tip. Spot gun 41 is at the cutting edge A gun support column 51 is attached to the bottom of the gun support column 51 which is attached vertically to the movable arm 15. It will be done.

[0013] Next, the operation of the embodiment illustrated in FIGS. 1, 2, and 3 will be explained. Spot When moving the tong gun 41 horizontally to the welding location, the air cylinder 34 is Pistons 35a and 35 protrude from both ends of the air cylinder 34 to introduce air. Select one of b and expand it. Then, the chain 33 moves accordingly. As the chain 33 moves, the sprockets 31 and 32 rotate in the moving direction. The rotating shaft side sprocket 31 is integrally attached to the movable arm 15 side. As the chain 33 and the rotating shaft side sprocket 31 rotate, the movable arm 15 moves as follows. Moved horizontally.

[0014] If you want to make a finer movement, grab the spot gun 41 and move it manually. let Therefore, the welding tip 42 at the tip of the gun is positioned at the required location on the work surface 11. be done.

[0015] In the embodiment shown in FIGS. 4 and 5, a bracket is attached to the upper part of the fixed arm 14. 36 is fixed, and the bracket 36 extends to the upper part of the arm fixing part 21. times A universal joint 37 is provided between the rotating shaft 22 and a bracket 36 located above the rotating shaft 22. can be installed. On the bracket 36 located at the top of the universal joint 37, there is a rotating A rotary actuator (air cylinder) that can attach the shaft 38 to the universal joint 37 ) 39 is installed. Rotation with rotary actuator 39 by universal joint 37 Since the shaft 22 is connected, the rotation shaft 38 of the rotary actuator 39 and the support The rotation shafts 22 that connect the arms do not necessarily have to be aligned vertically. rotor The air actuator 39 has two ports, and you can select the port to supply air. By introducing this, as shown in FIG. Rotate or rotate to the left. In this embodiment, the auxiliary drive means B includes a universal joint 37, It is composed of a rotary actuator 39, etc.

[0016] In this embodiment, the auxiliary drive means A, B include the fixed arm 14 and the fixed arm 15. Although the movable arms 15 are installed between them, they may be installed between the movable arms 15 and 15.

[0017] Next, the operation of the embodiment illustrated in FIGS. 4 and 5 will be explained. spot gun 41 horizontally to the welding location, set the rotary actuator 39. By selecting the two closed ports and introducing air, as shown in Figure 4, In this way, the rotation axis 38 is rotated to the right or to the left. Then, Lo - rotating shaft 38 of tally actuator 39, universal joint 37, support arms 14, 15 The rotational force is propagated to the rotating shaft 22 between them. If you want to move the spot further, The gun 41 is grabbed and moved manually. Therefore, the movable arm 15 The welding tip 42 at the tip of the gun is moved in the horizontal direction and positioned on the required location on the work surface 11. be placed. Therefore, in the embodiment of the invention illustrated in FIGS. It is possible to smoothly move the support arm even when the weight of the support arm increases.

[0018] Next, the movable arm, rod, and strip shown in FIGS. 6 to 9 of the embodiment of this invention will be described. The configuration of the pot gun part will be explained. 51 is a rod. The rod 51 is electrically conductive. It is made of flexible material and is penetrated in the vertical direction at the tip of the movable arm 15 located at the tip. . 52 is a rod side contact portion. The rod side contact portion 52 is made of a conductive material such as copper. It is fixed around the upper end of the rod 51 in a collar shape. 53 is the arm side contact part be. The arm-side contact portion 53 is located on the movable arm 15 side opposite to the lower side of the rod-side contact portion 52. The rod 51 is installed so as to be insulated from the rod 51. 54 is a cable. K The bull 54 is attached to the upper part of the movable arm 15 and has one end connected to one of the electrodes of the transformer 12. The other end is connected to the arm side contact portion 53. 55 is an insulator , the rod 51 and the arm-side contact portion 53 are insulated. The rod 51 is connected to the insulator 55 The rod 51 can be rotated about the longitudinal direction while being in contact with each other. 56 is a spring. Ba The screw 56 is installed between the movable arm 15 and the arm-side contact portion 53, and is connected to the arm-side contact portion 53. The portion 53 is urged toward the rod side contact portion 52 side.

[0019] 61 is a lifting means. In this embodiment, the lifting means 61 is from an air cylinder. Become. The elevating means 61 is installed around the rod 51 at the bottom of the movable arm 15. . Therefore, a movable arm like the conventional air cylinder 104 as shown in FIG. Since it is not located on the room 101, the height is not increased. 62 is piste It is. The piston 62 is attached around the rod 51 inside the air cylinder 61. It will be done. 63a and 63b are air introduction ports, and 64 is a seal. Air inlet 63a is on the upper side of the piston 62 in the air cylinder 61, and the air inlet 63b is on the top side of the piston 62 in the air cylinder 61. An air pump (not shown) is opened at the bottom of the cylinder 62 and introduces air into the cylinder. Ru. 64 is a seal, 65a, 65b, 65c are guides, 66 is a barrel, and 67 is a pin. The nut 68 that fixes the stone 62 to the rod 51 is a cross roller bearing. be. 69 is an outer cylinder. The outer cylinder 69 has a cylindrical shape, and the upper end is below the lifting means 61. from the lifting means 61 to the lower end of the lower rod 51 and around it. The lower end is open, and the lower end of the rod 51 can protrude from the lower end of the outer cylinder 69. be.

[0020] At the end of the spot gun 41 opposite to the tip 42, there is a handle for operating the spot gun 41. The handle 43 can be attached. Tip 42 from the handle 43 of the spot gun 41 On the side, a spot gun mounting portion 4 protrudes from the tip of the outer cylinder 69 toward the handle 43 side. 4, the spot gun 41 is attached to the outer cylinder 69. Therefore, Figure 8 shows the diagram Because the rod 105 protrudes toward the tip side as in the conventional example shown, , it does not become an obstacle to bring the workpiece closer to the workpiece, and it is a box-shaped workpiece C. It is possible to work by inserting it deep into the hole.

[0021] 45 is a contact portion on the spot gun side. The spot gun side contact portion 45 is a conductive element. The rod 51 is provided on the upper surface of the spot gun 41 facing the lower end of the rod 51. Further, the spot gun side contact portion 45 is electrically connected to the tip 42 .

[0022] Next, the functions of the movable arm, rod, and spot gun illustrated in FIGS. 6 to 9 will be explained. I will explain about it.

[0023] The spot gun 41 is moved horizontally to the welding location. Next, the air inlet Air is introduced from 63a and the piston 62 is lowered. Then, the rod 51 is lowered. When the rod 51 is lowered, the tip of the rod 51 comes into contact with the spot gun side contact portion 45. Further rod 5 1 is lowered, it presses the tip 42 at the tip of the spot gun 41 toward the work surface 11. . At the same time, by lowering the rod 51 of the lifting means 61, the rod side contact portion 52 and the earth The contact portion 53 is contacted with the arm side contact portion 53 .

[0024] Therefore, when the transformer 12 is energized, the rod side contact portion 52 and the arm side contact portion The contact portion 53 is in contact, and the tip of the rod 51 and the spot gun side contact portion 45 are in contact. Since the chip 42 is in contact with the work surface 11, current flows between the chip 42 and the work surface 11. Welding work is performed on the placed object C to be welded.

[0025] After spot welding, when air is introduced from the air inlet 63b, the piston 6 2 is raised, and the rod side contact part 52 and the arm side contact part 53 contact and the rod side contact part 52 and the arm side contact part 53 are brought into contact. The contact between the tip of the rod 51 and the spot gun side contact portion 45 is released. Next, hand grip the handle 43 to move the chip 42 position.

[0026] In the embodiment illustrated in FIG. 10, the lower part of the movable arm 15 located at the most extreme A rotary actuator 39 is attached to the rotary actuator 39. Rotary actuator 39 times A gear 71 is attached to the rotating shaft 38. The gear 71 is attached to the outer periphery of the outer cylinder 69. It meshes with the gear 72 that has been turned.

[0027] When the rotary actuator 39 is operated, the outer cylinder 69 is moved through the gears 71 and 72. By rotating, the gun support column 51 is rotated, so the spot gun 41 is also horizontal. change position.

[0028] Instead of the rotary actuator 39 shown in FIG. 10, the rotary actuator 39 shown in FIG. The gears 71 and 72 may be operated by the air cylinder 34 or the like.

[0029]

[Effect of the idea]

Therefore, with this design, it is possible to operate the spot gun smoothly with light operations. It is Noh.

[Brief explanation of drawings]

[Figure 1] Plan view of an embodiment of this invention

[Figure 2] Partially enlarged front view of the connection between the fixed arm and the movable arm

[Figure 3] Partially enlarged view of Figure 2

[Figure 4] Plan view of another embodiment

[Fig. 5] A partially enlarged front view of the connection part between the fixed arm and the movable arm of the embodiment shown in Fig. 4.

[Figure 6] Partially enlarged cross-sectional view of the rod and spot gun parts

[Figure 7] Partially enlarged sectional view of the rod and spot gun parts

[Figure 8] Partially enlarged cross-sectional view of the rod and spot gun parts

[Figure 9] Partially enlarged front view of movable arm, rod, and spot gun parts

[Figure 10] Partially enlarged front view of the movable arm, rod, and spot gun parts of another embodiment

[Figure 11] Partially enlarged front view of a conventional movable arm, rod, and spot gun

[Explanation of symbols]

11 work surface, 15 Movable arm 41 Spot gun 45 Spot gun side contact part 51 Rod 52 Rod side contact part 53 Arm side contact part 61 Lifting means 69 Outer tube

Claims (1)

[Scope of utility model registration request] Claim 1: A work surface provided at the bottom of the spot gun and connected to one of the electrodes, a movable arm movable horizontally on the work surface, and a movable arm made of a conductive material that penetrates vertically at the tip of the movable arm. a rod, a rod-side contact portion provided in a collar shape around a position above the movable arm of the rod; An arm-side contact part that is connected and installed, a lifting means that moves the rod up and down, an outer cylinder that extends from the lifting means to the lower part of the rod, and a spot gun that is installed at the lower end of the outer cylinder and has a tip at its tip. A spot welding machine comprising: a spot gun-side contact portion that is provided on the spot gun to face the lower part of the rod and is connected to the tip.