JPS6352777A - Stop shortage alarm for spot welding equipment - Google Patents

Abstract

PURPOSE:To prevent defective goods from being worked at a next stage by transmitting a signal which is not yet counted up to an OR circuit and cooperating output of the OR circuit with a starting signal of a working machine of the next stage to sound an alarm while making the working machine of the next stage inoperative. CONSTITUTION:When a worker start stepping on a foot switch of a FS6, a PL6 to mean that a M6 (6 mm nut) is driven at present is lighted and a spot signal is sent from an AND1 to a counter device 1 by a signal from a detector 3. When six spots of a prescribed number are finished, namely, when a figure of an LED1 is reduced and made zero, a counted-up signal is produced from the counter device 1 and one output of an FF1 is transmitted to an AND5. Since when the one output of the FF1, is sent, said zero disappears, an AND2 is not formed and even if the foot switch FS6 is stepped on repeatedly any more, a contact point CR6 is left open and the welding is not performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a spot welding point shortage warning device for spot welding equipment. It is constructed so that the next process processing machine does not operate when the spot welding machine starts, and is especially used in fields where each spot welding machine is equipped with multiple welding point counter devices. be.

(b) Prior Art The conventional technology will be explained with reference to FIG. 3, which is a plan view of a car floor tunnel. Products such as automobiles, such as passenger cars with rear seats, commercial vehicles with no rear seats, or commercial vehicles with rear seats that roll over, require spot welding on a common 7 inch floor panel. Since the locations and number of dots are different, the operator has to weld the multiple and [m projection nuts according to each type of ta. To explain the case where a nut with a hole diameter of 8mm is welded to the place marked with an
When the machine is moved to the worker, the worker should stand in a row of 6
6 U-nuts and 4 8-gear nuts must be welded, and when the B panel comes down, weld it as shown in the same figure.
Eight J-nuts and six 8-fight nuts must be welded, and if it is a C panel, they must be in contact with the panel at t6 in the same way. Furthermore, in addition to the above-mentioned 6U and 8U NANDs, for example, 10m NANDs may be combined.

Conventionally, in such cases, when the A panel arrived, the operator operated a digital switch to preset the six circles marked with ○, and as welding progressed, the number of welded pieces was digitally counted and displayed. When the predetermined number of 6 nuts is reached, the worker finishes welding the 6mj nuts marked with a circle. Next, set the 4 x marks on panel A again and complete the welding of the 8U nuts in the same way as for the ○ marks.

(C) Problems to be Solved by the Invention In the conventional technology as described above, the number of pieces for each circle or Count with a device (e.g. subtraction count) [Since it goes to 7, mark ○ and
It is troublesome as it is necessary to always pay close attention to each mark so that there is no shortage of dots. Furthermore, if the panel is passed on to the subsequent process without noticing that there are insufficient dots on either or both of the O and × marks, a defective product will result.

In addition, it is easy to understand the following theory I and the practical example described below. Projection: JL uses the case of non-nuts as an example, but the use of one light beam is not limited to such nuts.
For example, the number of dots that should be made with a thick electrode and the number of dots that should be made with a thin camellia ladle are different for each part, so it is possible to utilize even a different type of bottle stand.

(b) Means for solving the problem and its function The present invention was devised to solve the above problem, and includes a counter for the number of bath contact points stored in each spot welder. In the case where the equipment is provided with a plurality of units, an AND circuit operated by the force r7 count from each counter device;
The next process processing machine is closed by the OR circuit that counts up uncompleted 1 (made in No. 11iI) from each counter device, the start signal of the next process machining r, 1i1i, and the output of the above-mentioned node circuit. and an M-signal device which is generated by the starting signal (8) and the output signal of the OR circuit. The AND circuit and OR circuit are made to function by the start of the process machine (O).

(e) Example Figure 1 is a control circuit diagram, Figure 2 is a control 4 based on the same circuit.
It is a front view of the I board, and here it is a case of a 6u nut and an 8IIJ nut C (hereinafter abbreviated as M6 and M8, respectively). In this embodiment, in order to be compatible with six types of panels, a digital switch D6a%D for IV46 is used.
(')b, D6C, D(5d, D6G, and D6
The prescribed number of each can be set by f (the digital switch is configured as an OR circuit).
, to the counter device 1, and each digital switch is connected to pilot lamps PLa...PLf, which are shared with those for MQ, which will be described later. digital switches D13a, D5b
D8c, D8a, D13e and D8f are connected to counter device +t2 via a 4-channel circuit OR1.

Both counter devices 1 and 2 have displays IJD 1 and LI.
! It can be easily solved by connecting the foot switch etc. to which iD is connected, but each counter device 1
．． 2 is said to be attached to a spot welding machine (not shown).

Foot switch FB for operating spot welding machine
The IHA signal emitted by stepping on 6 and the signal for each welding from the welding point number detection device 6 are connected to an AND circuit.
, the dot signal is sent to the counter device 11. There are various types of predistribution sensing device 5, such as a reed switch that operates within the magnetic field of a welding electrode, and a limit switch that operates by the movement of a movable electrode.

When Iha is launched by stepping on ys6, it is currently M.
Neuilot lamp P indicating that No. 6 is being welded
At the same time as turning on L6, it is also transmitted to the AND circuit ANI). When the flip-flop circuit FFI connected to the counter device 1 is not given a manual reset date, a zero output is made with the reset manual
By being applied to ND*, AND is established and the relay coil CR is excited, and this relay coil CR
, and the normally open contacts CR, are closed and the operating current is applied to the welding machine.

When the worker steps on the foot switch FB6 a specified number of times, count up No. 18 is given from the counter 1iit1 as the set input S to the FF, thereby obtaining 1 output.This 1 output causes +311 StB reset manual power (to Since the associated O output disappears, the AND is not established, and the relay coil CR1 is demagnetized and the contact CR becomes open. Therefore, even if the foot switch 1Ps6 is pressed any further, M6 will not be in bath contact.

In addition, the switch 4 is a changeover switch for using or not using the counter ileM1, and the case shown is the switching state when it is in use.
3 resets the counter devices 1 and 2, and is connected to both counter devices via the OR circuit ORs. □ Next, the counter device for M8! The circuit related to f2 is the same as that of counter device 1 described above.

That is, the depression signal from the foot switch FS3 and the detection signal from the detection device M3 are applied to the counter device 2 via A11D, and the flip-flop circuit FFt also performs the same function as the above-mentioned FF, and is applied to the relay coil CR via AND. , and closes the normally open contact. Note that the switch 5 is the same as the switch 4 described above.

When both M6 and M8 complete the specified number of hits, the signals from both counter devices cause F' stone and FiF to output one output, and when these are applied to AND, M
6 and M8 each number is correct 1. ! O as E
K lamp G lights up.

This device issues an alarm using the start signal of the next processing machine as a trigger, and for this purpose, the start switch 7 of the next processing machine is connected to terminal B.

8 is a switch that is switched when using the device, and Figure 1 shows the switching state during use.

A starting signal transmission circuit 9 is provided to apply a starting signal obtained by closing the starting switch 7 to AND circuits AND& and AND, which will be described later. In reality, the circuit is connected in such a way that Fil'3 is interposed so that one output from the 7-rip, 70-tube circuit FF1) (!) is given to AND6 and ANDq.
1)- is connected so that one output of A, ND, is given outside the circuit 9, and the circuit 9 is connected to ANI)r.
In addition, it is connected so that a signal from an OR circuit OR4, which will be described later, is applied. When AIJD is established, the output is connected to operate the alarm system W (for example, a buzzer) BZ, and when AND is established, the relay coil CR of the relay switch is activated. The normal chest contact that pairs with this IJ L/- coil CR is installed at terminal 10 of the device, and when the contact point is closed, it means that the activation switch of the next processing machine is closed. are doing. That is, it is an actuation switch that is closed by AND.

There are various types of next-process processing machines, for example,
This includes spot welding machines for welding different parts, and processes for screwing bolts into bath-welded nuts, and in a broader sense, it also includes conveyance equipment for the next process.

The wires are connected to OR, so that a 0 output from FB' and E"?, that is, a signal indicating that the number of welds has not reached the specified number, is given to i!.

When the start switch Z is pressed and a start signal is transmitted, the timer TD starts measuring time from that point.

That is, when the time is counted by one output of FF, and after a certain period of time (for example, 1 to 2 seconds), timer No. 48 is output from TD, it becomes 'F, FFt, and FF.

It becomes a reset input to turn off the lamp G, and
, and the operation of the MND machine has been resolved. In addition, when the count-up signals of both M6 and M8 are output from AND, , the signal from AND is input to AND, and after a certain period of time, the count-up signal from timer TD is input. is transmitted to the OR circuit OR3, and counter devices fjiL1 and fjiL2 are also reset.

To explain how to set the number of dots using panels A, B, and C in Figure 6 as an example, in case of panel A,
6 digital switch 1) Operate 6a to switch to the number of 6 shown.
, and then operate the digital switch I) 9a to set the number shown in the figure, 4. The number of B panels is set as 8 and 6, and the C panels are set as 6 and 6, and when the number of A panels is input to the counter device, a selection signal is input to the terminal Ta. The terminal is T a
-T f. For example, if a selection signal is input to Tc, the number of dots on the C panel has been set, and L
6 is displayed on HD I and 6 is displayed on LJCD t. This selection can be made by selecting one of the terminals T&~Tf and manually inputting a selection signal by the operator, or by inputting a selection signal manually into the control device (
For example, a selection signal may be automatically provided from a control computer. For example, select 46 for terminal Td.
When the number is given, the number of dots is input to the counter devices v1 and 2 via digital switches D6d and D3d, and at the same time, the number of dots and the pilot lamp PLd on the display section IJD and LED are lit.

Although only shown in FIG. 2, the reference numeral 11 is a power switch, and the lamp W is turned on when the power is turned on. Furthermore, the rectangular 1 shown in Figure @2 is a name plate that represents the name of each part. ◇ To explain the operation of the above embodiment, panel A in Figure 6 flows to the worker's place. Now, the working millstone! 7 gives a selection signal to the terminal Ta manually (a one-touch manual switch is suitable, but it is not shown here), or determines that the process control control device is the A panel. When the terminal Ta [selection signal is inputted automatically, the specified number of candy with 6 dots for M6 and 4 dots for M8 is set to counter devices 1 and 2 from each digital switch D6a and Di3a, and the display section LKD1 and LED , are displayed as 6 and 4, respectively. Here, when the worker starts reading all the note switches of P゛86, PL6, which means that M6 is currently being hit, lights up, and the signal from the detection device 5 changes the point from MND1 to counter device 1. (''
will be sent. 11"1 until the specified number of 6 is not reached.
From 1'1, there is an O output that indicates the count-up incomplete signal, and this establishes ANIh and relay coil CR.

is energized, the contact (J) closes and the operating current is sent to the welding machine.Here, when the specified number of 6@ is completed, that is, LE
When the number D decreases to 0, a count-up signal is output from the counter device [ifl, and the 1 output of FF is transmitted to ANDI+. When the output 1 of FF goes up, the 0 output mentioned above disappears, so AMDI is not established and no matter how many times you step on foot switch IP86, contact C
R, remains open and no welding is performed.

Next, the worker operates the foot switch 788 to
When welding, AND, counter device 2, L
jCD,, FF Tomi, AND 4, CR Yi and PL8
etc. are the above-mentioned AND, , counter device 1, LE, respectively.
It has exactly the same effect as D, FF, AMDI, CR, and PL6.

Therefore, detailed explanation is omitted here.

When the specified number of M8s (four) is completed, one output from the FF is applied to ANDl, and is output from ANDs with one output from the above-mentioned formula. On the other hand, if both M6 and M8 have not reached the specified number, or if either one has not reached the specified number, OR,
It is being output from.

When the operator presses the start switch 7 of the next processing machine with the specified number of M6 and M8 in contact with each other, a start signal is sent to the circuit 9.
is passed from AND to ANDv, but ANDv
There is no signal given from 〇9 to 〇〇.

ANDI7'C'' injury occurred and relay coil CR, or 1
1, and the operation switch CR of the next processing machine is closed. Therefore, the operator is not alerted to the lack of dots and can operate the processing machine for the next process smoothly.

Next, if the operator accidentally presses the start switch 7 even though the number of hits for either or both of M6 and M8 is insufficient, from OR, according to ANI) y. signal (count-up incomplete signal) and F]P
Since 1 output from 1 is given, the alarm device BZ warns that there is a shortage of points. Since the count-up signal from ANDI is not acting on the fifth MDIl at 14:00, the operation switch cR remains at υU and the next process processing machine cannot be operated. Therefore, even if an operator makes such a mistake, a warning will be issued and the processing machine for the next process will be rendered unnecessary.
It is possible to reliably prevent defective parts with insufficient dots from being transferred to the downstream process ◇ When the start switch 7 is pressed, a signal from the PF is given to the timer TD, so after a certain period of time (for example, 1 to 2 seconds) Fl! ', , FFs, II[+8, counter devices 1 and 2, etc. are reset.

Since the control circuit shown in FIG. 1 is capable of welding I8 when the specified number of I6 is not completed, there is a risk that if the operator presses the foot switch incorrectly, the wrong nut may be welded at the predetermined location. Figures @4 and @5 are shown for reference in order to solve such problems.

The one in Figure 4 is an AND circuit AN compared to the one in Figure @1.
D@, ANDIG and related manual switch 1
2 and 13, one of each switch is used as the operating power source 14 and 15 for this control circuit.

In the illustrated switching state, the manual switch 12 is electrically connected to the operating power supply 14 side, and the manual switch 16 is electrically electrically connected to one output side of the FF, and this state is a type in which priority is given to M6. That is, since the 0 output, which is the unfinished count-up signal from B'F, and the current from the operating power supply 14 are acting on AND, the establishment of AND is completed and the operating switch CR and foot switch FB6 are applied. K is closed, allowing welding to continue. When the specified number bath connection of I6 is completed, the 1 output from FF is applied to AND, o via the manual switch 16, and together with the 0 output, which is the count-up incomplete signal from FF, ANDl is If established, step on foot switch FS5 and activate switch CU
t is closed and it becomes possible to continue welding I8. Therefore, even if the foot switch FS3 of I8 is operated when the specified number of I6 is not completed, AND and G are not established.
M8 welding is not possible ◇Double manual switch 12.
16 to the opposite side from the illustrated position, M8
Since this is a priority format and its operation can be easily understood from the previous explanation, its explanation is omitted here.

Next, the ones in Figure 5 are foot switches FS6 and F1a.
If you step on one of them first, you will not be able to weld until you have completed the specified number of welds, even if you step on the other one.Only the necessary parts are shown as a circuit diagram.

OR circuit for 7 ribs 70 tubes yy and FIFL+
, the reset human power R is given, and the corresponding 0 output is the AND circuit '1 from both FF4 and FF, respectively.
The OR circuits ORs and ORν that receive the output are connected so that the signal indicating completion of the specified number of I8 is transmitted from the wiring 16 for OR, and the signal indicating completion of the specified number of I6 is connected to ORW. The signal is connected to be transmitted from 17. Also, for the AND circuit AND, , Fe2, OF6
and M6 incomplete signals are given, and the CR is designed to perform the closing operation with its output.
At the same time, the AND circuit AMI) 14 has Fe2. The ORv and M8 incomplete signals are applied, and the CRt performs a closing operation with the output thereof. Note that the aforementioned incomplete signals I6 and I8 are given to the connections 18 and 19.

Now, if you step on IPSs first, ANDI,
Since all output requirements are met, one output from FF@ is OR
.

is assigned to AND 14 through AND
The output requirements of I4 are completed, CR2 is closed, and welding of I8 can be continued. In this case, since the O output from FF has disappeared, AND u is in a state where it cannot be output even if you step on I8 (5). If you step on PH1 after all the I8's are completed, the M8 completion signal is OR from connection 16,
goes to ANDIg, and as a result, AND, j becomes closed and welding of I6 can be continued. If the operator accidentally steps on Fe2 while I8 is not completed, O
Since there is no M8 completion signal in R, OR is not output, and therefore AND13 is not output either. Therefore,
cn, is not activated.

(f) Effect According to the present invention, the count-up signal from each counter device is transmitted to the AND circuit, and the output of this AND circuit is used together with the start signal of the next process processing machine to start the next process machine. In addition to controlling the operability, the count-up incomplete signal from each counter device is transmitted to the OR circuit, and the output of the OR circuit and the start signal of the next process machine are used together to improve the operability of the next process machine. Since it is intended to provide a warning while eliminating the need for
When welding detection and the number of ladle points are divided between panels in each building, as in (1B) of panel F, workers immediately notice the lack of weld points and send defective products to subsequent processes, or Process Ml King
-It is completely preventable [1: It is possible. Also,
In the example < M6 and M80 people have RBI number setting means (
If a digital switch (for example, a digital switch) is provided, it is possible to eliminate the tediousness of the operator as in the conventional example.

[Brief explanation of drawings]

Figure 1 is a control circuit diagram showing an example of the main north gate's protrusion, Figure 2 is a throat/r hemostasis diagram of the control panel of Figure 1, and Figure 6 shows an example of the nut's valley connection for each panel. , and a simplified plan view, and FIGS. 4 and 5 are circuit diagrams showing examples of addition of complementary circuits for reference.

Claims (1)

[Claims] Each spot welding machine is equipped with multiple counter devices for the number of welding points, and the AND circuit is activated by the count-up signal from each counter device and the count-up incomplete signal from each counter device. an operating switch for the next processing machine that is closed by a start signal of the next processing machine and an output signal of the AND circuit, and an alarm device that is activated by the start signal and the output signal of the OR circuit. A spot welding point shortage warning device for a spot welding device.