JPS586894Y2 - Gate slippage detection device - Google Patents

Description

[Detailed description of the invention] When a hydraulic device is used to lift and lower a gate that blocks a waterway, oil may leak from the connections of the hydraulic device when the gate is stopped in a certain position for a long period of time. There is.

This causes the gate to slip down.

Therefore, a mechanism is required to detect when the gate has slipped by a certain amount or more and to return the gate to its original position.

The conventional gate slippage detection mechanism uses an electromagnetic clutch 01 as shown in Fig. 1, and during gate operation, the clutch coil 02 is demagnetized to separate the human power shaft 03 and the gate slippage detection shaft 04. If the gate is to be stopped at a certain position for a long period of time with the gate in a state where it cannot be detected, the clutch coil is energized and the input shaft 03 and gate slippage detection shaft 04 are connected. A method is used in which a fall detection switch 05 is actuated by rotation of the detection shaft 04, a hydraulic drive device is operated, and when the gate returns to its original position, a stop switch 06 is turned on and the gate is stopped.

However, when the gate is stopped at a certain position for a long period of time using an electromagnetic clutch, it is actually not preferable to constantly energize the electromagnetic clutch, and it is completely useless when the electromagnetic clutch power is cut off. .

Therefore, the most preferable method is reverse excitation, that is, energizing the electromagnetic clutch coil to separate the input shaft and detection shaft, and then demagnetizing the connection.However, in reality, there is no demand for such a small electromagnetic clutch, so it is not commercially available. Not yet.

The present invention was developed in view of the above, and a differential gear is incorporated into the input shaft that transmits the amount of gate movement, and a brake shaft operated by an electromagnetic brake that is released by excitation and braked by demagnetization is attached to this differential gear, and the gate When the gate is in operation, the electromagnetic brake is energized and the brake shaft is freed, and when the gate is stopped, the electromagnetic brake is demagnetized and the brake shaft is fixed, and the gate is not slid. The detection shaft is rotated through a differential gear so that slippage can be detected.

An embodiment of the present invention will be described with reference to FIG.

1 is a hydraulically driven gate that opens and closes a waterway using the hydraulic pressure of a hydraulic cylinder (not shown); 2 is an input shaft that transmits the amount of gate movement of the hydraulically driven gate 1; 3 is a differential gear attached to the input shaft 2; The moving gears are four bevel gears 4 and 5 that mesh with each other.
, 6.7 and gears 8 and 9 provided outside the bevel gears 4 and 5, respectively.The input shaft 2 loosely passes through the bevel gears 4 and 5 to support the differential gear, and the bevel gears 6 and 7 are It is supported on an arm 10 which is secured to the input shaft 2 at right angles.

Furthermore, a pointer shaft 12 for a gate opening degree meter is connected to one end of the input shaft 2 via a joint 11 .

13 indicates a guideline. A pulley 15 is fixed to the other end of the input shaft 2, and a pulley 15 is connected to a wire rope 14 for detecting the gate position (opening degree) connected to the gate 1 driven by hydraulic pressure.
A counterweight 16 is suspended from the other end of the wire rope 14.

Reference numeral 17 denotes a brake shaft attached to the electromagnetic brake 18. When the electromagnetic brake 18 is energized, the brake shaft 17 is in a released state, and when it is demagnetized, it is in a fixed state.

The brake shaft 17 is associated with a differential gear in which a connecting gear 19 fixed to the tip of the brake shaft meshes with the gear 9 on the bevel gear 5 side.

Reference numeral 20 denotes a slippage detection shaft for detecting the amount of slippage of the gate, and a connecting gear 21 fixed to one end of the gate slippage detection shaft meshes with the gear 8 on the side of the bevel gear 4 and is associated with the differential gear 3.

This gate slippage detection shaft 20 is provided with a rotation suppressing means 22 using a spring.

In the figure, one end of a wire rope 24 is attached to a pulley 23 fixed to a gate slippage detection shaft 20. The other end of the wire rope is wound around a pulley 23, and the other end of the wire rope is connected to a spring 25 attached to a casing. is set to a preset value.

Furthermore, the gate slippage detection shaft 20 has a cam 26 and a cam 26.
7 are fixed, and these cams are engaged with a falling detection switch 28 and a stop switch 29.

The input shaft 2, the pointer shaft 12, the brake shaft 17, and the gate slippage detection shaft 20 are each supported by bearings (not shown).

To explain the operation in the above configuration, during gate operation, the brake power source is turned on, the electromagnetic brake 18 is excited, and the brake shaft 17 is in a free state.

Now, when the gate 1 starts operating, the amount of movement of the gate is controlled by the input shaft 2 by the wire rope 14 for detecting date standing upright connected to the gate, the counterweight 16, and the pulley 15.
can be conveyed to.

When the input shaft 2 rotates, the gate slippage detection shaft 20 is fixed at that position by the tension of the wire rope 24 by the spring 25, so the bevel gears 6 and 7 attached to the arm 10 rotate the bevel gear 4. At the same time, rotation is transmitted to the bevel gear 5, and the rotational force is released as rotation of the brake shaft 17.

Further, the rotation of the input shaft 2 is transmitted to the pointer shaft 12 to display the gate position.

A cam (not shown) is attached to the pointer shaft 12, and this cam operates a limit switch to stop the gate at a predetermined position.

In this way, during gate operation, the gate slippage detection axis 20
is not rotated, so there is no detection of gate slippage.

Next, when the gate is stopped, the brake power is turned off and the electromagnetic brake 18 is demagnetized, so that the brake is applied and the brake shaft 17 is fixed.

In this state, the gate may slip down due to oil leakage, etc., and the input shaft 2
When the brake shaft 17 and the gate slippage detection shaft 20 are rotated, the bevel gears 6 and 7 rotate the bevel gear 5 because the braking torque of the brake shaft is larger than the torque of the detection shaft due to the spring. It rotates on its own axis and transmits rotation to the bevel gear 4, thereby rotating the gate slippage detection shaft 20 and the pointer shaft 12.

When the amount of slippage reaches a certain value, the slippage detection switch 28 operates and transmits the electric signal to the slippage automatic recovery circuit 3.
When the gate 1 is moved by the gate hydraulic drive device 31 and returned to its original position, the stop switch 29 stops the gate.

As explained above, this invention uses an electromagnetic brake that frees the brake shaft by energizing it and fixes it by demagnetizing it, so there is no need to constantly excite it when the gate is stopped for a long time, and when the power is cut off. However, it is possible to detect gate slippage, and by incorporating a differential gear, it can have the same function as a reverse excitation electromagnetic clutch, and the electromagnetic brake can be a small commercially available one, and the gate slippage detection mechanism can be used. Can be made compact.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional gate slip-down detection device using an electromagnetic clutch, and FIG. 2 is a schematic diagram of an embodiment of a gate slip-down detection device according to the present invention. 1: Hydraulic drive gate, 2: Input shaft, 3: Differential gear, 12
: Gate distance meter pointer shaft, 13: Pointer, 17: Brake shaft, 18: Electromagnetic brake, 19: Connecting gear, 20: Gate slippage detection shaft, 21: Connecting gear, 22: Rotation suppressing means, 28: Misalignment Fall detection switch.

Claims (1)

[Scope of utility model registration request] A differential gear attached to the input shaft that transmits the amount of gate movement of the hydraulically driven gate and operated by the same shaft, a gate opening gauge pointer shaft with a pointer connected to the input shaft, and a differential gear that transmits the gate movement amount of the differential gear. A brake shaft attached to an electromagnetic brake that is released by excitation and braked by demagnetization is related to one of the opposing bevel gears through a connecting gear, and the opposing bevel gear is loosely fitted to the input shaft of the differential gear. A gate slippage detection shaft that operates a slippage detection switch when the gate at a stop position, which is related to the other gear via a connected gear, slips by a predetermined amount, and the input shaft when the brake shaft is in a free state. The invention is characterized by comprising a rotation suppressing means provided on the gate slippage detection shaft, which suppresses the rotation of the gate slippage detection shaft so that the rotation of the gate slippage detection shaft does not operate together with the rotational force of the differential gear operated by the rotation of the gate slippage detection shaft. Gate slippage detection device.