JPS624800Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a valve opening device for a high-pressure gas container, which screws a valve into a high-pressure gas container by rotating a rotary shaft having a valve chuck at its tip by an electric motor with a reduction gear.

Generally, when screwing a valve into a high-pressure gas container using the rotation of an electric motor with a reduction gear (hereinafter referred to as the electric motor), if the screwing torque is weak, gas may leak from the screwed part, and if the screwing torque is strong, the valve may leak. Since there is a drawback that the screw may be damaged, it is desired to optimize the screwing torque. To eliminate this drawback,
Conventionally, there have been two types of devices: (1) a device in which a rotating shaft provided with a valve chuck and an electric motor shaft are connected via friction plates for rotation, and the frictional resistance between the friction plates does not exceed a predetermined torque; (2) A rotating shaft is connected to an electric motor shaft via a steel wound spring, and the electric motor is stopped when a predetermined torque exceeds the repulsive force of the wound spring, and (3) a timer is used. Devices have been proposed that rotate an electric motor for a certain period of time, screw in a valve, and then stop it.
In the case of (1), the wear of the friction plate is severe, which has the disadvantage that the screw-in torque cannot always be maintained constant, and in the cases of (2) and (3), the screw-in torque is reduced due to fatigue of the coiled spring. There was a drawback that the screw-in torque fluctuated depending on the condition of the threaded part. Furthermore, since there is no flexibility in setting the torque, there is a disadvantage that the same valve-clamping machine cannot be used to clamp various types of containers with different screw-in torques.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a valve opening device for a high-pressure gas container that can always screw in a valve reliably with a constant torque.

According to the present invention, in a device for screwing a valve into a high-pressure gas container by rotating a rotating shaft with a valve chuck at the tip by an electric motor with a reduction gear, the rotating shaft is driven by the electric motor with a reduction gear through a universal joint. The electric motor with a reduction gear is provided with an overcurrent alarm, and the shaft of the electric motor with a reduction gear and the rotating shaft provided with the valve chuck are connected via an electromagnetic clutch, and the electromagnetic clutch is connected to the valve screw. When the shaft of the electric motor engages when the motor is closed, and when the load current of the electric motor with the reducer reaches a predetermined current value, the overcurrent alarm cuts off the power to the electric motor with the reducer, A control device is provided which simultaneously opens the electromagnetic clutch and stops screwing the valve.

Therefore, in the present invention, by using the relationship between the current value of the motor and the load, the control device detects the valve screwing torque based on the load current value of the motor and stops the motor at a predetermined current value. , the valve can always be screwed in with the appropriate torque. In particular, since a valve gear requires the use of an electric motor with a reduction gear, a screw-in torque greater than the sensed torque is generated due to inertia. However, by using an electromagnetic clutch, inertial force is not transmitted and an appropriate screw-in torque can be obtained.

During operation, the electromagnetic clutch is engaged at the same time as the electric motor is driven, and the valve is screwed into the high-pressure gas container.
When the screw-in torque reaches a current value corresponding to a predetermined torque, the overcurrent alarm activates, cutting off the power to the motor and electromagnetic clutch, stopping the rotation of the motor, and at the same time interrupting the engagement of the electromagnetic clutch. Once opened, the rotating shaft can be easily turned manually.

Therefore, the screw-in condition can be checked on the spot, and it is safe even if the control device breaks down.

Next, an embodiment of the present invention will be described with reference to the drawings.
In the figure, 1 is a high-pressure gas container, 2 is a valve of the high-pressure gas container 1, and 3 is a rotating shaft with a valve chuck 5 at its tip via a universal joint 4, and is connected by bearings 6, 6'. Supported. Reference numeral 7 denotes an electric motor, and an electromagnetic clutch 8 is installed on its shaft, and a chain wheel 10 fixed to the rotating shaft 3 and a chain wheel 9 meshing with the electromagnetic clutch 8 are connected by a chain 11. 12
is an overcurrent alarm, and this has setting knob 13.
A meter relay 14 having a
The current is connected to the electric motor 7 through an overcurrent alarm 12, and part of it is connected to the electromagnetic clutch 8 through a rectifier 15. 16 is a driving switch.

Place the high pressure gas container 1 in a predetermined position, attach the valve 2 to the valve chuck 5, and use the setting knob to set the current value corresponding to the desired screw torque to the overcurrent alarm 12.
meter relay 14. When the operation switch 16 is turned on, the electric motor 7 begins to rotate, and when the electromagnetic clutch 8 and chain wheel 9 engage, the rotation is transmitted to the rotating shaft 3 via the chain 11, and the valve 2 is screwed into the high pressure gas container 1. be included.

When the screw-in torque reaches a predetermined torque, the load current of the motor 7 reaches a predetermined value, the meter relay 14 is activated, and the overcurrent alarm 12 automatically turns off the power to the motor 7 and the electromagnetic clutch 8. At the same time as the electric motor 7 stops rotating, the electromagnetic clutch 8 is released. Therefore, the rotating shaft 3 can be easily rotated manually, so that the valve chuck 5 can be removed from the valve 2 of the high-pressure gas container 1.

Therefore, overcurrent alarm 12 and rectifier 15
When the valve is screwed in, the electromagnetic clutch engages and the shaft drives the rotating shaft, and when the load current of the reducer-equipped motor reaches a predetermined current value, the overcurrent alarm activates the reducer-equipped motor. This constitutes a control device that cuts off the power to the valve, simultaneously opens the electromagnetic clutch and stops the valve from being screwed in.

The above example shows a case where the rotation of the rotating shaft is performed by opening and closing an electromagnetic clutch directly connected to the motor shaft, but an electromagnetic clutch may be installed between the rotating shafts so that the rotation of the motor shaft rotates and stops the rotating shaft. You can also do that.

As described above, according to the present invention, if the diameter of the chain wheel is determined in advance, the rotation speed of the rotating shaft will be constant, so a certain relationship will occur between the load current of the motor and the screw-in torque, and the load The screw-in torque can be controlled by the control device according to the current value. Therefore, not only does the screw-in torque not fluctuate due to mechanical wear unlike conventional devices, but the torque can be set freely by simply adjusting the setting knob on the meter relay, and the meter relay is non-contact type. Since we use the same, stable operation can be achieved semi-permanently.

In addition, high-pressure gas containers are usually heavy and difficult to position in a specified position, but by providing a universal joint on the rotating shaft, there is no problem in screwing in the valve even if there is a slight error in the cylinder position. There is no problem in detecting torque.

Therefore, the present invention can easily and reliably carry out the valve-clamping operation as a valve-clamping device for high-pressure gas cylinders, and its practical effects are great.

[Brief explanation of the drawing]

The drawings are explanatory diagrams showing one aspect of the present invention. 3... Rotating shaft, 5... Valve chuck, 7... Electric motor with reduction gear, 8... Electromagnetic clutch, 9, 10...
Chain wheel, 11... Chain, 12... Overcurrent alarm, 15... Rectifier.

Claims (1)

[Scope of utility model registration request] In a device that screws a valve into a high-pressure gas container by rotating a rotating shaft with a valve chuck at the tip by an electric motor with a reducer, the rotating shaft is drivingly connected to the electric motor with a reducer through a universal joint, and the reducer The motor is equipped with an overcurrent alarm, and the shaft of the motor with a speed reducer and the rotating shaft provided with the valve chuck are connected via an electromagnetic clutch, and when the valve is screwed in, the electromagnetic clutch engages and shuts down the motor. When the rotating shaft is driven by the shaft and the load current of the motor with a reduction gear reaches a predetermined current value, the overcurrent alarm cuts off the power to the motor with a reduction gear, and at the same time the electromagnetic clutch is disengaged. A valve opening device for a high-pressure gas container, characterized in that it is equipped with a control device that opens and stops screwing the valve.