CN1161202C - welding equipment - Google Patents

Abstract

A welding apparatus is provided with a lower electrode portion (5), an upper electrode portion (6), and a cooling water circulation conduit (14) that supplies circulating cooling water to a welding electrode pressurizing hydraulic cylinder torch (13) on the upper electrode portion (6). Furthermore, a check valve (15) is disposed on the cooling water circulation conduit (14) on the upstream side of the cylinder head (13). Further, a pressure booster (16) is disposed on the cooling water circulation conduit (14) on the downstream side of the cylinder head (13), and the cylinder head (13) is projected for welding by increasing the pressure of the cooling water in the conduit (14) from the pressure booster (16) through the cylinder head (13) to the check valve (15).

Description

welding equipment

technical field

The invention relates to a welding device.

Background technique

Conventionally, such a welding apparatus is well known, and as shown in FIG. 16, it is provided with an electrode platen portion having a lower base plate portion a and an upper base plate portion b that can be lifted to approach and leave the lower base plate portion a. c, A plurality of lower electrode portions d disposed on the lower substrate portion a, a plurality of upper electrode portions e disposed on the upper substrate portion b, and an ascending drive mechanism for raising and lowering the upper substrate portion b. The upper electrode part e has a welding electrode pressurization hydraulic cylinder welding torch g, which is supplied with circulating cooling water in a non-pressurized state and which is pressed into contact with a welding object placed on the lower electrode part d in a pressurized state, and Each hydraulic cylinder welding torch g is connected with the circulating cooling water supply conduit h. Also, a booster i is arranged on the conduit h on the upstream side of the hydraulic cylinder torch g, and a throttle valve j is arranged on the conduit h on the downstream side of the hydraulic cylinder torch g. In FIG. 16, a plurality of hydraulic cylinder torches constitute a group, and one booster i and one throttle valve j are provided corresponding to the group. That is to say, corresponding to multiple groups of hydraulic cylinder welding torches g, the welding equipment is provided with multiple boosters i and throttle valves j accordingly.

In the non-pressurized state of the hydraulic cylinder welding torch g, the supercharger i and the throttle valve j are both in the open state, and the cooling water is circulated to the hydraulic cylinder welding torch g through the conduit h. During welding, the throttle valve j and the supercharger i are turned into a closed state, and the cooling water in the conduit is pressurized from the supercharger i through the hydraulic cylinder welding torch g to the throttle valve j, and the hydraulic cylinder welding torch extended, comes into contact with the welding object f placed on the lower electrode portion d, and welds it.

However, this has some problems, the supercharger i and the throttle valve j require a large installation space, but are used only once or twice in a production cycle, relative to their utilization, compared with each supercharger i and throttle valve j Corresponding solenoid valves lead to high costs. Recently, however, pressed parts and welded points have tended to increase dramatically, so that the upper and lower electrode portions increase accordingly in a welding apparatus, thereby increasing the number of parts such as a booster and complicating the structure of the apparatus. In addition, there is a problem directly related to weldability, that is, in the traditional welding torch pressurization control, the control of multiple (for example, 18) boosters cannot be set individually in one production cycle, so the pressurization control of this Welding parameters are forced to be constant.

Also, this welding apparatus is provided with a power supply portion (not shown) on the side of the substrate holder n, and provided with a lower contact conductor p for electrically connecting the lower electrode portion d to the power supply portion at intervals on the side of the electrode platen portion c and The upper electrode portions e are electrically connected to the upper contact conductors g of the power supply portion at intervals. For these reasons, there are also problems such as high cost of the electrode stage part c, and the electrode stage part c becomes large due to the contact space above the lower substrate part a, and due to (between the power supply part and the electrode stage c Between) the current path is long, so that the current efficiency is not good.

In order to solve the above problems, an object of the present invention is to provide a welding device, which can simplify the structure and reduce the production cost, can improve the work efficiency, and can make the welding quality stable.

This object is achieved according to the invention by a welding device comprising the features of claim 1 , 2 , 3 , 4 , 5 , 6 or 7 .

Description of drawings

The present invention will be described in detail below with reference to the accompanying drawings, wherein:

Fig. 1 is a schematic view showing the structure of a preferred embodiment of the welding apparatus of the present invention;

Fig. 2 is a schematic view showing the structure of the lifting drive mechanism;

Fig. 3A is a working diagram showing the non-pressurized state of the welding electrode pressurized hydraulic cylinder welding torch;

Fig. 3B is a working diagram showing the pressurized state of the welding electrode pressurizing hydraulic cylinder welding torch;

Fig. 4 is the schematic diagram that represents another preferred embodiment structure of welding equipment;

Fig. 5 is a working schematic diagram showing the non-pressurized state of the welding electrode pressurized hydraulic cylinder welding torch;

Fig. 6 is a working schematic diagram showing the pressurized state of the welding electrode pressurization hydraulic cylinder welding torch;

Fig. 7 is a schematic diagram showing the positional relationship of the electrode platen part, the upper contact conductor and the lower contact conductor, and the power supply part;

Fig. 8 is a schematic side view showing upper and lower contact conductors and their surrounding structures;

Fig. 9 is a schematic front view showing upper and lower contact conductors and their surrounding structures;

Fig. 10 is a top view showing the main part of the upper contact conductor;

Fig. 11 is a semi-cross-sectional view showing a vertical welding electrode pressurized hydraulic cylinder welding torch;

Fig. 12 is a side view showing a horizontal welding electrode pressurized hydraulic cylinder welding torch;

Fig. 13 is a schematic front view showing a transverse welding electrode pressurized hydraulic cylinder welding torch;

Fig. 14 is a working schematic diagram representing a welding state;

Fig. 15A is a schematic diagram showing a connection state of a welding torch current detection sensor;

Fig. 15B is a schematic view showing the connection state of the torch current detection sensor; and

Fig. 16 is a schematic diagram showing a conventional example.

Detailed ways

Preferred embodiments of the present invention will now be described with reference to the accompanying drawings.

Figures 1 and 2 show a preferred embodiment of the welding apparatus of the present invention. This welding equipment is provided with an electrode platen part 3, which has a lower base plate part 1 and an upper base plate part 2, wherein at least one of them is driven to lift, so that the upper base plate part and the lower base plate part can freely approach and separate from each other, and the electrode table The plate part 3 is detachably connected to the substrate holder 4 . Also, a plurality of lower electrode portions 5 are arranged on the lower substrate portion 1 , and a plurality of upper electrode portions 6 are arranged on the upper substrate portion 2 .

Specifically, the upper substrate part 2 is arranged on the substrate support 4 and can be lifted, and the upper electrode part 6 is driven by the lifting drive mechanism 8 to rise with the upper substrate part 2 . The lifting drive mechanism 8 is provided with a vertical guide rod 7 connected to the substrate support 4 for guiding the upper substrate part 2 to slide freely in the vertical direction, a nut part 9 arranged on the upper substrate part 2, a vertical A screw shaft 10 arranged in the substrate holder 4 to be freely rotatable and screwed into the nut portion 9, and a motor 11 for driving the screw shaft 10 to rotate. Torque is transmitted from the motor 11 to the screw shaft 10 through a rotating force transmission member such as a belt, a pulley, etc. 12 denotes a balance weight that lightens the load on the motor 11 . (By increasing the power of the motor 11, the above-mentioned counterweight 12 can be omitted.)

Also in this welding apparatus, the upper electrode portion 6 has a welding electrode pressurizing hydraulic cylinder torch 13 which is supplied with cooling water in a pressurized state and is pressed against the welding object placed on the lower electrode portion 5 in a pressurized state. W contacts, and a cooling water circulation conduit 14 for supplying and circulating cooling water to each hydraulic cylinder torch 13 of each upper electrode portion 6 is provided. This cooling water is sent from a cooling water supply device not shown in the figure, and circulates in the direction of arrow A in the pipe 14 .

In addition, as shown in Figures 1 and 3, in the welding equipment of the present invention, a check valve 15 is arranged on the cooling water circulation conduit 14 on the upstream side of the hydraulic cylinder welding torch 13, and a supercharger 16 is arranged on the hydraulic cylinder welding torch The downstream side of 13 is arranged on the cooling water circulation conduit 14 . In this case, one hydraulic cylinder torch 13 or a predetermined number of hydraulic cylinder torches 13 constitute a group, and a check valve 15 and a booster 16 are provided corresponding to the group of hydraulic cylinder torches 13 . That is, the welding equipment is provided with a plurality of check valves 15 and a plurality of boosters 16 corresponding to groups of hydraulic cylinder welding torches 13, respectively. Also, reference numeral 17 denotes an electromagnetic valve for switching the supply direction of the compressed air supplied to the supercharger 16 . As mentioned above, the hydraulic cylinder welding torch 13 is defined as one or a plurality of hydraulic cylinder welding torches constituting a group in the present invention.

FIG. 3A shows the unpressurized state (non-welding state) of the hydraulic cylinder welding torch 13 . In this state, the cooling water flowing through the cooling water circulation conduit 14 is sequentially circulated through the check valve 15 , the hydraulic cylinder torch 13 and the supercharger 16 . During welding, the upper base plate part 2 is lowered to a predetermined height position by means of the lifting drive mechanism 8 described with reference to FIG. Solenoid valve 17 is converted to pressurization that supercharger 16 becomes closed state as shown in Figure 3B, check valve 15 is closed and thus hydraulic cylinder welding torch 13 (following water pressure) stretches out, and hydraulic cylinder welding torch 13 The electrode tip 18 is pressed onto the welding object W placed on the lower electrode portion 5 for welding. The offset section indicates that the cooling water is pressurized. In this case, 4 hydraulic cylinder welding torches 13 in one group are simultaneously extended and welded (see FIG. 1 ).

And, after welding, as shown in FIG. 3A , the supercharger 16 is turned into an open state by switching the solenoid valve 17 again, the check valve is opened, the cooling water is circulated again, and the hydraulic cylinder supplied with compressed air (see arrow b) The welding gun 13 becomes the retracted state, and is separated from the lower electrode portion 5 .

As mentioned above, other groups of hydraulic cylinder welding guns not shown in FIGS. 3A and 3B are also the same, and each group of hydraulic cylinder welding guns is also extended and returned by opening and closing each booster 16 corresponding to each group of hydraulic cylinder welding guns. shrink and weld.

And, as shown in Fig. 4 and Fig. 5, under the situation that the welding equipment of the present invention has many upper electrode parts 6 (for example 72 parts), one corresponding to predetermined multiple groups of one or more upper electrode parts 6 increments The compressor 16 is arranged on the cooling water conduit 14 on the downstream side of the hydraulic cylinder welding torch 13, and a check valve 15 corresponding to each group of hydraulic cylinder welding torches 13 is arranged on the conduit 14 on the upstream side of the hydraulic cylinder welding torch, and a branch valve 19 Corresponding to each group of hydraulic cylinder welding torches 13 are arranged between the hydraulic cylinder welding torches 13 and the supercharger 16 , and can be switched from being connected to the supercharger 16 to making the supercharger 16 not work.

Referring specifically to the preferred embodiment in Fig. 4, there are many groups arranged, each group of four upper electrode parts 6 (hydraulic cylinder welding torches 13), such as the first group 31, the second group 32, the third group 33, the fourth group 34, the fifth group 35 and so on. Also, one booster 16 is arranged corresponding to four groups of hydraulic cylinder welding torches 13 , and one check valve 15 and one branch valve 19 are arranged corresponding to each group of hydraulic cylinder welding torches 13 . That is, in FIG. 4 , one supercharger 16 a corresponds to four groups, namely, the first group 31 to the fourth group 34 .

And the cooling water circulation conduit that links to each other with the cooling water supply device that is not shown in the figure splits out a plurality of first branch conduits 21 at the upstream part, and cooling water sequentially passes through each first branch conduit 21, each check valve 15, Each group of hydraulic cylinder welding torches 13 and branch valves 19 flows (see FIG. 5 ). The hydraulic cylinder welding torches 13 in one group are connected in series with the first branch conduit 21 .

Also, as shown in FIGS. 4 and 5 , on the downstream side of the branch valve 19 , a second branch conduit 22 connected to the supercharger 16 side is arranged, and a third branch conduit for making the supercharger 16 inoperative is arranged. twenty three. In this case, the four second branch conduits 22 corresponding to the four branch valves 19 merge into one conduit, which passes through a supercharger 16 to the cooling water supply device (not shown), and corresponds to The four third branch conduits 23 of the four branch valves 19 are merged into one conduit connected to a cooling water supply device (not shown in the figure). That is, the cooling water circulation conduit 14 is composed of a first branch conduit 21 , a second branch conduit 22 , a third branch conduit 23 and the like.

And, as shown in Figure 4, be provided with air pipeline 24,25,26 and 27, the compressed air (as arrow B) provided by the air compressor not shown in the figure is sent to by air pipeline 24,25,26 and 27 Each supercharger 16, each branch valve 19 and each hydraulic cylinder welding torch 13. Also, reference numeral 28 denotes an electropneumatic regulator, reference numeral 29 denotes a booster valve for returning the welding torch, and reference numeral 30 denotes a tank.

4 and 5 show the unpressurized state (non-welding state) of each group of hydraulic cylinder welding torches 13 , and each branch valve 19 switches to close each second branch conduit 22 . Therefore, the cooling water flowing in the cooling water circulation conduit 14 returns to the cooling water supply device through the respective check valves 15 , the respective hydraulic cylinder torches 13 and the respective branch valves 19 .

In the case of welding with the upper electrode portion 6 of the first group 31, for example, as shown in FIG. to the second branch conduit 22 . As the solenoid valve 20 corresponding to the branch valve 19a is switched to close the branch conduit 23 and open the branch conduit 22, the piston valve portion 36 is moved by feeding compressed air. Then, the cooling water flowing from the supercharger 16 to the check valve 15 in the conduit 14 through the branch valve 19a and the hydraulic cylinder welding torch 13a increases in pressure due to the operation of the supercharger 16, the check valve 15 is closed, and the hydraulic cylinder welding torch 13a is thus The electrode head 18 of the hydraulic cylinder welding torch 13a is pressed onto the welding object W placed on the lower electrode portion 5 for welding (see FIG. 4 ). The offset part indicates that the cooling water is pressurized. In this case, the other groups of hydraulic cylinder welding torches 13 are in an unpressurized state (non-welding state), ie, the second group 32, the third group 33, the fourth group 34, etc. are provided with continuously circulating cooling water.

And, after welding, as shown in Figure 5, the check valve 15a is opened, and the cooling water is circulated again by opening the supercharger 16a and the switching branch valve 19a, and the hydraulic cylinder welding gun 13a provided with compressed air (indicated by arrow B) Return to the retracted state.

Next, in the case of welding with the upper electrode portion 6 of the second group 32, similar to the above description, the four hydraulic cylinder welding torches 13 of the second group 32 are switched by switching the branch valve 19b corresponding to the second group 32 and increasing The operation of the pressurizer 16a pressurizes the cooling water to protrude. As described above, the hydraulic cylinder welding guns 13 of the third group 33 and the fourth group 34 of the upper electrode portion 6 can be sequentially protruded for welding. Also, in the case where welding is performed by each group of upper electrode portions 6 subsequent to the fifth group 35, the booster 16 and the branch valve 19 corresponding to each group are also selected and manipulated.

The order of welding does not have to start from the first group 31 , but can be freely set by controlling the solenoid valve 17 corresponding to the booster 16 and the solenoid valve 20 corresponding to each group of branch valves 19 . Moreover, multiple groups of welding can be performed at the same time, for example, the upper electrode parts 6 of the first group 31 and the upper electrode parts 6 of the fourth group 34 work simultaneously for welding. Also, the electrode pressurization for each welding point can be controlled by means of the pressure booster 16, and welding can be performed with high precision.

Although the case where one booster 16 corresponds to four sets of upper electrode portions 6 is given in the present embodiment, one booster 16 may correspond to one to three or five or more sets of upper electrode portions 6 . The number of upper electrode portions 6 for one set can be freely determined. Also, in the case where the number of groups corresponding to one supercharger 16 is small, for example, one supercharger 16 corresponds to only one group of upper electrode portions 6, the branch valve 19 may be omitted.

As shown in FIG. 7, this welding equipment is provided with a power supply part (transmission) 37 on the substrate support 4, and the substrate support 4 side behind the electrode platen part 3 is provided with a spaced electrical connection between the lower electrode part 5 and the power supply part 37. The lower contact conductor 38 and the upper contact conductor 39 electrically connect the upper electrode portion 6 and the power supply portion 37 at intervals.

In a more detailed description, as shown in Fig. 7 and Fig. 8-10, the horizontal platform part 40 of the substrate support 4 is arranged behind the lower substrate part 1 of the electrode platen part 3, and the movable support 42 passes through a pair of straight lines A guide 41 is arranged on the horizontal deck portion 40 so as to slide back and forth. The above-mentioned power supply part 37 is connected on the movable support 42 .

Also, the movable bracket 42 has a vertical fixed bracket 45 at the front, and a pair of extension hydraulic cylinders 46 are vertically connected to the upper portion of the vertical fixed bracket 45 . Also, a slider 48 is arranged on the front side of the upper portion of the vertical fixing bracket 45 through a pair of linear guides 47 so as to slide vertically, and the upper end of the extension hydraulic cylinder 46 is connected to the rearwardly protruding portion of the slider 48 . That is, the slider 48 can move vertically by extension and retraction of the extension hydraulic cylinder 46 .

Four extended and contracted upper hydraulic cylinders 44 are fixed on the front of the slider 48 in a horizontal arrangement at predetermined intervals, and four contact conductors 50 are arranged in front of the upper hydraulic cylinders 44 . Then, the lower ends of the four upper flexible conductors (splitter boards) 52 are respectively electrically connected to the connection terminals 51 of the power supply part 37 , and the upper ends of the upper flexible conductors are respectively electrically connected to the contact conductors 50 . In addition, upper contact conductors 39 are respectively connected to the rod ends of the upper hydraulic cylinders 44 , and each upper contact conductor 39 is inserted into a hole formed on the respective contact conductor 50 . In this case, the upper contact conductor 39 is inserted into the hole so as to be slid back and forth relative to the contact conductor 50, moved back and forth by the upper hydraulic cylinder 44, and thus current can flow between the power supply portion 37 and the upper electrode portion 6.

Also, four lower hydraulic cylinders 49 are fixed at the lower portion of the front of the vertical fixing bracket 45 of the substrate holder 4 corresponding to the positions of the four upper hydraulic cylinders 44 , and four contact conductors 53 are arranged in front of the lower hydraulic cylinders 49 . Moreover, the upper ends of the four lower flexible conductors (splitter boards) 55 are respectively electrically connected to the other terminal 54 of the power supply part 37 , and the lower ends of the lower flexible conductors 55 are respectively electrically connected to the contact conductors 53 . Further, the lower contact conductors 38 are respectively connected to rod ends of the lower hydraulic cylinders 49 , and each lower contact conductor 38 is inserted into a hole formed on each contact conductor 53 . In this case, the lower contact conductor 38 is inserted into the hole, slidable back and forth relative to the contact conductor 53 , moved back and forth by the lower hydraulic cylinder 49 , and thus current can flow between the power supply portion 37 and the lower electrode portion 5 . The lower contact conductor 38 is arranged at approximately the same position as the height of the lower substrate part 1 .

In welding, as shown in Figure 8, the upper base plate part 2 descends to a predetermined height position, and the movable support 42 moves forward to a predetermined position on the side of the electrode platen part 3 by means of a reciprocating mechanism (not shown in the figure). , so that the upper contact conductor 39 is laterally close to the end surface 2 a of the upper substrate part 2 , and the lower contact conductor 38 is laterally close to the end surface 1 a of the lower substrate part 1 . By vertically moving the upper slider 48 in advance by means of the extension hydraulic cylinder 46, the height position of the upper contact conductor 39 is adjusted in advance to the height position after the upper base plate 2 is lowered.

Then, as shown in FIGS. 7 and 10 , a predetermined pair of upper contact conductors 39 and lower contact conductors 38 are moved forward by means of upper hydraulic cylinders 44 and lower hydraulic cylinders 49 , the upper contact conductors 39 contacting the end surface of the upper base plate portion 2 2a, and the lower contact conductor 38 contacts the end face 1a of the lower substrate part 1. The upper substrate part 2 and the lower substrate part 1 are composed of a conductive material. Also, the welding electrode pressurization cylinder gun 43 of the predetermined upper electrode portion 6 is pressurized by cooling water, and the hydraulic cylinder gun 13 protrudes and presses on the welding object W placed on the lower electrode portion 5 (as described above), The welding current thus flows between the upper electrode portion 6 and the lower electrode portion 5 corresponding to the upper electrode portion 6, so that the welding object W is welded.

In the case where, for example, four pairs of upper electrode portions 6 and lower electrode portions 5 are provided and each pair is welded as shown in FIG. 7 , each pair of upper contact conductors corresponding to each pair of upper electrode portions 6 and lower electrode portions 5 39 and the lower contact conductor 38 are sequentially contacted with the upper substrate part 2 and the lower substrate part 1 for soldering. In addition, the respective lower electrode portions 5 are insulated with an insulating material. Thus, by insulating, the welding current is prevented from being diverted to the other lower electrode portion 5 side through the welding object W during welding (no reaction current is generated), and the welding current can be concentrated on the welding point. Also, when a plurality of pairs of upper electrode portions 6 and lower electrode portions 5 constitute a set, and each set of lower electrode portions 5 is insulated, welding is performed without generating a reaction current in each set.

Moreover, FIGS. 7 and 11 show half cross-sectional views of the vertical welding electrode pressurizing hydraulic cylinder torch 13 (described with reference to FIGS. 1 , 3 and 7 ). This vertical welding electrode pressurized hydraulic cylinder welding torch 13 is provided with a body portion 57 connected to the torch connector 56 (connected to the upper base plate portion 2) of the upper electrode portion 6, inserted into the body portion 57 so as to freely slide the hydraulic cylinder piston Rod portion 58 , cylinder extension rod portion 59 detachably connected to the end of piston rod 58 protruding from body portion 57 , and electrode head 60 connected to the end of extension rod portion 59 .

The main body portion 57 is composed of a flange portion 61 and an outer cylindrical portion 62. The bottom end of the outer cylindrical portion 62 is convexly connected to the protruding portion 61a of the flange portion 61. The flange portion 61 is provided with an inlet for cooling water to enter. holes 63 and an outlet hole 64 for cooling water to flow out, and the outer cylindrical portion 62 is provided with an air supply hole 66 for supplying compressed air. Also, the bottom end of the cooling pipe 65 communicates to the outlet hole 64 passing through the center of the protruding portion 61a. The cooling pipe 65 is inserted into the hole of the piston rod part 58 and the extension rod part 59, and between the piston rod part 58 and the cooling pipe 65, between the extension rod part 59 and the cooling pipe 65, the electrode connected to the extension rod part 59 The concave portion 69 of the head 60 and the inner side of the cooling pipe 65 form a channel for cooling water.

Also, a tapered peripheral surface 67 is formed on the end of the piston rod portion 58 and a tapered inner peripheral surface 68 is formed in the hole portion of the bottom end of the extension rod portion 59, and the tapered inner peripheral surface 68 of the extension rod portion 59 is in contact with The tapered peripheral surface 67 of the piston rod portion 58 constitutes an interference fit. Also, a tapered peripheral surface 70 is formed on the end of the extension rod 59, and a tapered inner peripheral surface 61 is formed on the concave portion 69 of the electrode head 60, and the tapered inner peripheral surface of the electrode head 60 71 forms an interference fit with the tapered peripheral surface 70 of the extension rod portion 59 .

That is, by preparing a plurality of extension rods having different lengths L, outer diameter D, and diameter D' of the electrode head, the extension rod 59 connected to the piston rod portion 58 in a detachable form can be easily replaced with a suitable one. Another extension rod 59 is dedicated to the specific welding operation (welding object W) and can be quickly replaced in the event of a failure. Therefore, it is not necessary to detach the piston rod 58 from the main body portion 57, thereby improving operational efficiency. Also, it is preferable to prepare electrode tip portions 60 corresponding to various extension rod portions 59 .

Moreover, according to different welding positions, a horizontal welding electrode pressurizing hydraulic cylinder welding torch 13 can be arranged on the upper electrode portion 6 as shown in FIGS. 12 to 14 . That is, this hydraulic cylinder welding torch 13 is employed when the position of the welding point of the welding object W is on the elevation. This horizontal hydraulic cylinder welding torch 13 provides a main body portion 72 whose upper end is connected to the upper base plate portion 2 having a protruding connector 73 at the lower end, a piston rod portion 74 inserted into the main body portion 72 that can slide freely vertically, and a piston rod portion 74 that is connected to the main body portion 72. The connecting portion 75 on the lower end of the piston rod portion 74 whose upper end protrudes from the main body portion 72 has one end connected to the protruding connecting piece 73 of the main body portion 72 and the other end connected to the vibration connecting portion 76 of the lower end of the connecting portion 75 , has an electrode head 77 and is detachably connected to the electrode block part 78 of the vibration connection part 76 .

The main body portion 72 has a flange portion 79 connected to the upper base plate portion 2, a cylindrical portion 81 having a head portion 74a of the piston rod portion 74 inserted therein so as to freely slide in a cavity 80, and the above-mentioned has a connecting hole extending from the cylindrical portion 81. A protruding connector 73 depending downwards. The flange portion 79 is provided with an inlet hole 82 for cooling water to enter the cavity 80 and an outlet hole 83 for cooling water to flow out of the cavity 80, and the cylindrical portion 81 is provided with an air supply for supplying compressed air to the cavity 80. Hole 84.

And, the piston rod part 74 has a bifurcated connector 85 having a connecting hole at the lower end, the connecting rod part 75 having a connecting hole is placed between a pair of connecting parts 85a, and the upper end of the connecting rod part 75 is connected with a connecting shaft 86. to connector 85a for free vibration.

Moreover, the vibration connecting portion 76 is composed of a rectangular block portion 87, a thin-walled portion 88 arranged to form the same plane as the upper surface of the block portion 87, and a pair of connecting holes formed from the block portion 87 and the thin-walled portion 88. The connecting piece 89 protruding from the upper surface is formed. The lower end of the link portion 75 is interposed between a pair of connecting pieces 89 on the block portion 87 side. The vibration connecting part 76 is connected to the link part 75 by a connecting shaft 90 and can freely vibrate, and the lower end of the protruding connecting part 73 is placed between a pair of connecting parts 89 and connected with the connecting shaft 91 .

Moreover, the electrode block part 78 has an upwardly open inner groove 98, the block part 87 of the vibration connection part 76 fits in the inner groove 98, and the electrode block part 78 is connected with the block part 87 by two bolts 92. connected. Reference numeral 93 denotes a flexible conductor. One end of the flexible conductor 93 is connected to the main body portion 72 by a bolt, and the other end is connected to the electrode block portion 78 by a bolt.

Then, during welding, the upper base plate portion 2 descends and the electrode head 77 of the hydraulic cylinder welding torch 13 approaches the vertical surface of the object W to be welded, and the piston rod portion 78 is assisted by the force in the cavity 80 in the electrode pressurized state shown in FIG. 14 . The hydraulic pressure of the cooling water drops, and the electrode tip portion 77 of the electrode block portion 78 vibrates through the vibrating connection portion 76, thereby being pressed against the welding object W from the lateral direction for welding.

According to this transverse hydraulic cylinder welding torch 13 , the welding torch connection part can be omitted or simplified, and the hydraulic cylinder welding torch 13 can be arranged in the electrode platen part 3 . Thus, positions where welding was impossible by the conventional method become possible, and the welding range can be enlarged (the number of welding points increases). In addition, welding suitable for the object W to be welded can be performed by preparing a plurality of electrode block parts 78 having different structures and sizes because the electrode block parts 78 are detachable.

Moreover, as shown in FIGS. 15A and 15B, in the welding apparatus of the present invention, the electrode pressurizing hydraulic cylinder welding torch 13 may be provided with a welding torch current detection sensor 94 for detecting the welding current of the electrode and non-destructively testing the welding quality level. . The disc-shaped torch current detection sensor 94 is made of the same material (for example, brass) used as the conductive substrate of the hydraulic cylinder torch 13, and the coil is insulated with molded epoxy. Reference numeral 99 denotes an electric wire that transmits a detection signal from the sensor 94 to the input amplifier side. The number of windings of the coil is determined based on the detection voltage on the input amplifier side with the actual measured current magnetic field. Also, this sensor 94 is provided with a connection hole 95 at the center, and the sensor 94 is placed between the hydraulic cylinder torch 13 and a flexible conductor 96, and fixed with a bolt 97 so that the electrode conductor passes through the hydraulic cylinder torch itself.

Then, welding torch current detection sensor 94 is connected to each of a plurality of hydraulic cylinder welding torches 13 in the welding equipment, and welding current detection (current magnetic field detection) is measured and judged by each hydraulic cylinder welding torch 13, for example, checks whether there is Current flows, and thus, the resistance condition of each current path, the actual welding state, the timing of electrode replacement, etc. can be detected. Although FIG. 15 shows a vertical hydraulic cylinder welding gun 13 provided with the sensor 94 , the horizontal hydraulic cylinder welding gun 13 described with reference to FIGS. 12 to 14 is also provided with the sensor 94 .

According to the welding apparatus of the present invention, simplification of the structure and reduction of the production cost can be obtained because the throttle valve and the circuit which are necessary in the conventional manner can be omitted. Furthermore, parts replacement and maintenance of the equipment become easy, and since the small check valve 15 is adopted, it becomes easy to change the installation site. Moreover, the equipment can be directly connected to the platen connection port that cannot be connected to the equipment in the traditional situation, the pipeline length of the cooling water circulation conduit 14 can be shortened, and the hydraulic cylinder welding torch is caused by the expansion of the high-pressure hose of the pipeline during pressurization. The delay in pressurization is reduced, so follow-up ability is improved.

Also, in a welding apparatus having a plurality of upper electrode portions 6, by making one branch valve 19 and one check valve 15 correspond to a group of upper electrode portions 6, the number of boosters 16 can be greatly reduced, for example, from The traditional 18 units are reduced to 4 units. By reducing the workload and space of assembly, the pipeline layout becomes easy and the production cost can be reduced. Furthermore, by using an electropneumatic regulator for the pressure control of the supercharger 16, the pressure control of each welding point can be performed, thereby realizing multi-point welding with high precision and stable quality. That is to say, electrode plus pressure control, the welding parameters for stable welding quality can be established.

Although pressure sensors must be set to detect the water pressure in the welding torch of the hydraulic cylinder for each conduit of many superchargers in the conventional situation, in the present invention, along with the reduction of the number of superchargers 16, the number of pressure sensors can be greatly reduced .

In addition, the structure of the lifting drive mechanism 8 becomes simple, and the number of parts and production cost of the drive system can be reduced and lowered. Also, since the platen height (height of the platen) can be changed and the platen height can be set low, the material cost of the electrode platen portion is reduced. In addition, platen replacement can be performed automatically, improving productivity.

Also, according to the welding apparatus of the present invention, the structure of the electrode platen portion 3 can be simplified, the production cost can be reduced, and the electrode platen portion 3 can be compacted because larger electrical contact parts in the electrode platen portion 3 can be omitted. Moreover, the current path (between the power supply portion 37 and the electrode platen portion 3) becomes shorter, the current efficiency improves, and the galvanic corrosion (due to surface roughness and insufficient contact pressure) that traditionally occurs on the current contact surface of the upper platen Coarsening of contact points caused by sparks) is eliminated.

Moreover, by preparing a variety of extension rod parts 59 having different lengths L, outer diameter D, and diameter D' of the electrode head, and capable of quick replacement in failure, the extension rod connected to the piston rod part 58 in a detachable manner Portion 59 can easily be replaced with another extension rod 59 suitable for a particular welding operation (welding object W). That is, it is not necessary to detach the piston rod 58 from the main body portion 57, thereby improving operability. Thus, the general applicability of the main body portion 57 is expanded, and the equipment cost is thus reduced.

Also, the connecting parts of the welding gun can be omitted or simplified, and the hydraulic cylinder welding gun 13 can be arranged inside the electrode platen part 3 . Along with this, it becomes possible to perform welding at positions that were not conventionally weldable, and thus it is possible to expand the welding range (increase the number of welding points). Furthermore, since the electrode block portion 78 is detachable, welding suitable for a specific object W to be welded can be easily performed by preparing a variety of electrode block portions 48 having different structures and sizes.

In addition, according to the welding equipment of the present invention, by detecting the current magnetic field with the torch current detection sensor 94 connected to each welding electrode pressurization hydraulic cylinder torch 13, it is possible to know the resistance condition of each current path, the actual welding state, the electrode replacement time, etc. . That is, the detection of welding products can be reduced.

Although preferred embodiments of the invention have been described in this specification, it is to be understood that the invention is intended to be illustrative rather than restrictive, since various changes may be made within the scope of the essential and essential characteristics of the invention.

Claims (1)

1. A welding apparatus provided with an electrode platen portion (3) having at least one of a lower base plate portion (1) and an upper base plate portion (1) which are driven up and down to freely approach and separate from each other ( 2); providing a plurality of lower electrode portions (5) connected to the lower substrate portion (1); providing a plurality of upper electrode portions (6) connected to the upper substrate portion (2), which have a Cooling water is provided below, and the welding electrode pressurization hydraulic cylinder welding torch (13) for welding is pressed against the welding object (W) placed on the lower electrode part (5) in a pressurized state; and a hydraulic pressure cylinder welding gun (13) is provided; The cylinder welding torch (13) provides the cooling water and makes it circulate the cooling water circulation conduit (14), which includes the following structure, wherein: A supercharger (16) corresponding to a plurality of groups of the above-mentioned electrode part (6) or a predetermined plurality of the above-mentioned upper electrode parts (6), which is arranged in the cooling water circulation conduit on the downstream side of the hydraulic cylinder welding torch (13) (14) on; A check valve (15) corresponding to a group of hydraulic cylinder welding torches (13), which is arranged on the cooling water circulation conduit (14) on the upstream side of the hydraulic cylinder welding torches (13); A branch valve (19) arranged on the cooling water circulation pipeline (14) between the hydraulic cylinder welding torch (13) and the supercharger (16) is corresponding to each group of hydraulic cylinder welding torches (13), and it can be converted to increase the Pressure booster (16) is connected with every group of hydraulic cylinder welding torches (13), perhaps converts to cut off booster (16) and the connection of every group of hydraulic cylinder welding torches (13); And By switching a plurality of branch valves (19) and pressurizing cooling water with a supercharger (16), a predetermined group of hydraulic cylinder welding torches (13) is extended and pressed against a welding object (W) for welding.

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