JPH0719627Y2 - Brake device for moving bolster - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a braking device for a moving bolster, and can be used when the moving bolster travels between a press working position in a press machine and a mold replacement position.

[0002]

BACKGROUND ART A moving bolster travels between a press working position in a press machine and a mold replacement position for replacement of a mold attached to the upper part of the moving bolster. As a method of stopping such a moving bolster at a predetermined position, the following method is generally used. That is, the first method is to equip the moving bolster with a general-purpose motor with a brake, and when stopping the bolster at a predetermined position, as shown in FIG. 3, before the stop position, that is, at the braking start position A. The driving system of the moving bolster is braked, and the moving bolster is stopped after the time TB. After that, the moving bolster is moved while stopping the motor switch in small increments of 0N-0FF to stop at the stop position B.

In the second method, a speed control unit or the like is attached to the driving motor of the moving bolster, so that the moving bolster running at high speed is temporarily braked at the braking start position A as shown in FIG. Put it in a low-speed running state. The bolster is running at low speed from there to stop position B.

[0004]

However, the position where the braking of the motor is started in order to stop the moving bolster at a predetermined position is usually determined on the assumption that the moving bolster has the heaviest weight. For that reason, in both the first and second methods, there is a difference in braking (deceleration) time TB as shown in FIGS. 3 and 4 depending on the weight of the bolster.

That is, in the first method, when the weight of the moving bolster is light, the inertia of the bolster is also small, so that the bolster stops immediately after the start of braking. That is, the deceleration time TB becomes short. Therefore, the distance from the stopped position to the stopped position B becomes long, and the 0N-0FF traveling time of the motor becomes long. Therefore, the moving bolster requires a long time to run at low speed, and it takes time to replace the mold, which adversely affects the entire press working process.

In the second method, the first method described above is also used.
When the weight of the bolster is light as in the method of (1), the braking time TB becomes short and the bolster immediately shifts to low speed running.
Therefore, the distance from the stopped position to the stopped position B becomes long, and therefore the low speed running time becomes long and the running time of the bolster is long. As described above, even in the second method, since it takes a long time to replace the mold, it adversely affects the entire press working process.

It is an object of the present invention to provide a moving bolster brake device capable of moving a moving bolster to a predetermined position between a press machine and a mold replacement position in a substantially constant time regardless of its weight. There is.

[0008]

According to the present invention, there is provided a drive unit of a moving bolster, a brake unit for braking the drive unit, a brake force control unit for controlling the braking force of the brake unit, and a weight of the moving bolster. A weight detecting means for detecting the weight of the moving bolster and a weight calculating means for calculating the weight detected by the weight detecting means into a braking force required for braking the moving bolster, and transmitting the calculated result to the braking force controlling means. This is a structure of a braking device for a moving bolster.

Further, it is preferable that the braking means is an electromagnetic powder clutch that uses a coupling force of the magnetic powder generated by energizing the coil as a braking force.

According to the present invention as described above, the weight detecting means detects the weight of the moving bolster when the driving portion moves, and the calculating means calculates the weight based on the detected weight.
Calculate the braking force required when braking the moving bolster. The calculated braking force is transmitted to the braking force control means, and the braking force of the braking means is controlled by this braking force control means.

As described above, since the braking force according to the weight of the moving bolster acts on the braking means, the braking time becomes constant regardless of the weight of the moving bolster, and the low speed traveling time becomes short. As a result, the traveling time can be shortened when the weight of the moving bolster is light, and as a result,
The die replacement time is short and does not adversely affect the entire press working process, thereby achieving the above object.

If an electromagnetic powder clutch is used as the braking means, the binding force of the magnetic powder is immediately generated by energization, so that the torque rise time is short and a quick response is obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an overall configuration diagram of a braking device 1 for a moving bolster according to this embodiment. According to the figure, the moving bolster 2 can travel on the rail 5 in the direction orthogonal to the plane of the drawing via the wheels 4 connected to the axle 3. Further, a mold 6 corresponding to a predetermined press working is appropriately attached on the bolster 2.

The moving bolster 2 is provided with a motor 9 and a speed reducer 10 thereof via a bracket 7. A drive gear 12 is mounted on a drive shaft 11 of the speed reducer 10, and the drive gear 12 meshes with a driven gear 13 mounted on the axle 3. Here, the driving unit 8 of the moving bolster 2 is configured by including the motor 9, the speed reducer 10, the driving shaft 11, the driving gear 12, and the driven gear 13, and the driving unit 8 enables the moving bolster 2 to be self-propelled. Has been done.

The motor 9 is provided with braking means 14 for stopping the motor 9. The braking means 14 is capable of converting the braking force by current control, for example, and uses a magnetic powder called a powder,
An electromagnetic powder brake is used which transmits torque by the binding force of magnetic powder in the excited state by energization. A power supply 15 is connected to the braking means 14 via a current control means 18 as a braking force control means.

An ammeter 16 as a weight detecting means is used for the motor 9. The ammeter 16 detects the current value when the motor 9 is started, and the weight of the moving bolster 2 is detected by the current value.

A calculating means 17 is connected to the ammeter 16. A microcomputer is used as the calculating means 17, and the calculating means 17 uses an ammeter.
The current value sent from 16 is calculated as the braking force required for braking the moving bolster 2 and corresponding to the weight of the bolster 2.

The output of the calculation means 17 is the current control means 18
Has been entered in. A variable resistor or the like is used as the current control means 18, and the braking means 14 is controlled according to the braking force calculated by the calculating means 17.

Next, the operation of this embodiment will be described. Figure 2
4 is a flow chart showing a procedure for stopping the moving bolster 2 at a predetermined position. According to the figure, when the bolster 2 moves between the press machine and the mold exchange position,
When the motor 9 is started and acceleration of the motor 9 is started in step 21, the current value of the motor 9 is detected by the ammeter 16 in step 22. The detected current value is calculated in step 23 by the calculating means 17 into a braking force required for braking the moving bolster 2 and corresponding to the weight of the bolster 2.

In step 24, the moving bolster 2 is constantly run after the acceleration of the motor 9, that is, the steady operation of the motor 9 is performed. When the steady operation of the motor 9 elapses for a predetermined time, it is determined in step 25 whether or not there is an external deceleration signal from a position detection sensor (not shown) or the like installed in advance at the braking (deceleration) start position.

When it is determined in step 25 that the deceleration signal is not output, the routine returns to step 24, and the steady operation of the motor 9 is performed. If the deceleration signal was issued in step 25,
In step 26, the deceleration of the motor 9 by the braking means 14 based on the braking force calculated in step 23 is started.

At step 27, after deceleration of the motor 9 is started,
It is determined whether a predetermined time has passed. If the predetermined time has not elapsed (N0), the process returns to step 26 and the deceleration of the motor 9 is continued, but if the predetermined time has elapsed (YES), the low speed operation of the motor 9 is started in step 28. In step 29, it is determined whether or not there is an external stop signal from a position detection sensor (not shown) or the like installed in advance at a predetermined stop position.

If it is determined in step 29 that the stop signal has not been issued, the process returns to step 28 and the low speed operation of the motor 9 is continued. If the stop signal was issued in step 29,
In step 30, the driving of the motor 9 is stopped, and the movement of the moving bolster 2 to the predetermined position is completed and stopped.

According to this embodiment as described above, the following effects can be obtained. That is, the weight of the moving bolster 2 including the mold is detected by the ammeter 16 and the bolster 2 is stopped at a predetermined position with a braking force commensurate with the weight, so that the braking time of the bolster 2 is reduced regardless of the weight of the bolster 2. Is constant, and when the weight of the bolster 2 is light, the time for low speed traveling is shortened. As a result, the die replacement time is shortened, which in turn shortens the entire press working process.

Further, in this embodiment, an electromagnetic powder brake is used as the braking means 14, and the electromagnetic powder brake acts as a braking force due to the binding of the magnetic powder upon energization, so that the torque rises quickly. Therefore, there is an effect that the moving bolster 2 can be stopped at a predetermined position extremely accurately.

The present invention is not limited to the above-described embodiment, but includes the following modifications and the like. That is, in the above embodiment, as the weight detecting means,
The ammeter 16 is used, and the ammeter 16 is connected to the motor 9 to detect the load as a current value. However, the present invention is not limited to this, and the load cell or the like is directly attached to the moving bolster 2 to detect the weight. May be. Further, the mold weight and the like are measured in advance by another measuring means or the like, or when the mold is lifted by the crane and attached to the moving bolster 2, the weight is detected by the crane and the weight detected by these is measured. You may input into the calculating means 17. In short, as long as the weight of the moving bolster 2 can be detected,
The means does not matter.

In addition, the specific structure, shape, and the like when implementing the present invention may be other structures and the like as long as the object of the present invention can be achieved.

[0027]

As described above, according to the moving bolster brake device of the present invention, the moving bolster is kept at a predetermined position between the press machine and the mold replacement position for a substantially constant time regardless of its weight. You can move and stop with.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a braking device for a moving bolster according to an embodiment of the present invention.

FIG. 2 is a flow chart showing an operation procedure of the brake device.

FIG. 3 is a relationship diagram between a traveling speed and a stop time in an example of a conventional braking device for a moving bolster.

FIG. 4 is a relationship diagram between a traveling speed and a stop time according to another example of the conventional moving bolster brake device.

[Explanation of symbols]

 1 Moving bolster brake device 2 Moving bolster 8 Drive unit 9 Motor 10 Reducer 14 Electromagnetic powder brake (brake means) 15 Power supply 16 Ammeter (weight detection means) 17 Calculation means 18 Current control means (brake force control means)

Claims (2)

[Scope of utility model registration request] 1. A drive unit of a moving bolster, a brake unit for braking the drive unit, a brake force control unit for controlling a braking force of the brake unit, and a weight detection unit for detecting the weight of the moving bolster. A moving bolster comprising: calculating means for calculating the weight detected by the weight detecting means into a braking force required for braking the moving bolster, and transmitting the calculated result to the braking force control means. Brake device. 2. The braking device for a moving bolster according to claim 1, wherein the braking means is an electromagnetic powder brake that uses a coupling force of magnetic powder generated by energizing a coil as a braking force.