JPH07247536A - Excessive load detection device of sluice gate door hoist - Google Patents

Abstract

PURPOSE:To detect an excessive load which is imposed on a power transmission device which connects a driving source to a sluice gate door when an emergency happens on a sluice gate door and prevent the happening of accidents and execute smooth operation and prevent energy loss and enhance the reliability of this device in a sluice gate door opening mechanism which is used to open a sluice gate door for a dam or a weir or the like. CONSTITUTION:An excessive load detection device 9, which comprises a differential gear mechanism, is installed to a power transmission mechanism which opens a sluice gate door. The tip of a driven bevel gear shaft 93 used for the excessive load detection device 9 is projected while springs 99 are mounted to both sides. This driven bevel gear shaft 93 prevents a free rotary motion at a vertical face in the power transmission direction. Limit switches 98, which halt the power supply to a motor serving as a drive source, are installed to both sides of the shaft 93.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rack type opening / closing machine used for opening and closing water gates such as dams and weirs, which connects the water gate and a drive source when an abnormality occurs in the water gate. Detecting an excessive load on the power transmission mechanism,
The present invention relates to an overload detection device for preventing accidents.

[0002]

2. Description of the Related Art Conventionally, as a countermeasure against an abnormal load applied to a switch of this type, a kind of torque limiter that cuts the edge of the input / output shaft when a torque exceeding a set value is applied. It may be arranged between the input shaft and the output shaft of the sluice gate switch, or as shown in FIG. 6, a worm gear 11 meshing with a worm wheel 13 is provided in the power transmission mechanism of the sluice gate switch.
There has been a device in which the operation at the time of overload is stopped by detecting the thrust force applied to the shaft 12 of the shaft 12 by a limit switch (not shown) arranged on the side thereof.

In FIG. 6, reference numeral 14 denotes a disc spring that elastically holds the shaft 12 of the worm gear 11 held slidably in the lateral direction at a predetermined pressure.

[0004]

In the above-mentioned conventional apparatus, the former first cuts the edge of the input / output shaft when a torque larger than the set value is applied, so that the sluice door is opened or closed. Regardless of the movement direction, it always descends by its own weight, and it takes time to re-operate when opening, so it is not possible to respond swiftly in an emergency. There was a fear that it would be worse.

Further, this device has a problem that the torque set value cannot be adjusted according to the operating conditions because the torque value that can be transmitted is determined by the mechanism incorporated inside.

The latter uses a worm gear with poor power transmission efficiency in the mechanism for driving the water gate, which is inefficient, consumes a large amount of energy, and is disadvantageous in terms of wear and noise. Had the problem.

The present invention aims to solve the above-mentioned conventional problems.

[0008]

According to the present invention, a differential gear device is provided in a power transmission mechanism for opening and closing a water gate, and a tip of a driven bevel gear shaft used in the differential gear device is projected. The above problems are solved by mounting springs on both sides of the shaft and further providing limit switches connected to the drive source at a predetermined distance from the shaft in both rotational directions of the shaft.

[0009]

The shaft of the driven bevel gear installed in the actuating gear device is arranged in the longitudinal direction according to the resistance force when the power from the input shaft connected to the drive source is transmitted to the output shaft connected to the door. Receives the rotational force of. Then, the springs arranged on both sides of the shaft elastically restrain the rotation of the mounting shaft against this rotational force.
Further, the limit switches arranged on both sides of the shaft are pushed by the shaft when a rotational force equal to or greater than the set value of the spring acts on the shaft, and act to stop the drive source.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the drawings.

First, FIG. 3 is a side view of a sluice gate opening / closing machine incorporating the device of the present invention, and FIG. 4 is a partially cutaway front view thereof.
As shown in the figure, this sluice gate opening and closing machine drives a rack rod 10 which is vertically inserted through the main body case 1 to
This is a so-called rack type in which a sluice gate (not shown) such as a dam or a weir attached to the lower end is moved up and down.

The structure is as shown in FIG.
The drive shaft 8 in which the gear 82 is fitted through the inner wall 1a from one side is rotatably attached to the vertical hollow portion 1c formed by the inner wall 1a of the rack rod 10 that meshes with the gear 82. And a gear 6 for driving the drive shaft 8 in the case 1.
A reduction gear mechanism 6 composed of 1 to 67 and the like is internally mounted, and a relay shaft 51 engaged with the reduction gear mechanism 6 is attached to penetrate one outer wall 1b.

A bevel gear 52 that meshes with a bevel gear 44 fixed to the tip of the shaft 42 of the self-weight lowering control device 4 is fixed to a portion of the relay shaft 51 protruding from the case 1, and the opening / closing speed of the sluice door is increased. A centrifugal braking device 3 for adjusting is attached. A gear 41 is fixed to the rear end of the shaft 42 of the self-weight lowering control device 4, and the gear 41 has an overload detecting device 9 as shown in FIG.
Meshes with a gear 97 attached to the output shaft 92. The input shaft 91 of the overload detection device 9 is connected to the braking device 7
Via the output shaft of the motor 2 serving as a drive source (not shown)
Are linked to.

In FIG. 4, reference numeral 71 is a braking device 7.
While preventing reverse rotation of the clutch, reference numeral 5 in FIG. 5 is a switching device for manually switching the drive of the water gate,
Reference numeral 53 is a manual handle, 43 is a mechanical multi-plate clutch installed in the self-weight lowering control device 4, and 45 is a self-weight lowering switching lever.

FIG. 1 and FIG. 2 are a side view and a vertical sectional view, respectively, of a main part of the above-mentioned overload detection device. As shown in the figure, the overload detection device 9 of the present invention is a normal differential gear in which driven bevel gears 96, 96 are arranged between a bevel gear 94 fixed to an input shaft 91 and a bevel gear 95 fixed to an output shaft 92. Although the structure is exactly the same as that of the device, in the present invention, the tip of the shaft 93 to which the driven bevel gears 96, 96 are attached is projected and the shaft 93 is
Limit switches 98, 98 for detecting the rotation of the shaft 93 and stopping the drive source, and springs 99, 99 for suppressing the rotation of the shaft 93 are provided on both sides of the switch.

In FIG. 1, reference numeral 100 is an adjusting bolt for adjusting the urging force of the spring 99, and 101 is the spring 9.
9 shows a spring retainer which is pressed by 9 and whose tip is in contact with the side surface of the driven bevel gear shaft 93.

Next, the operation of the rack type opening / closing machine having the above-mentioned structure will be described. First, the output of the motor 2 serving as a drive source is decelerated by a reduction gear (not shown) incorporated in the motor 2 to make a braking device 7. The braking device 7 transmits power to the input shaft 91 of the overload detection device 9. As shown in FIG. 2, the overload detection device 9 has the same structure as a normal differential gear device in which an input side bevel gear 94 and an output side bevel gear 95 are connected via driven bevel gears 96, 96. Assuming that the shaft 93 does not rotate in the vertical direction (the plane perpendicular to the power transmission direction), the rotation transmitted from the braking device 7 to the input shaft 91 is the input side bevel gear 9
4 is transmitted to the output side bevel gear 95 via the driven bevel gears 96, 96, and rotates the output shaft 92 in the opposite direction.

The rotation of the output shaft 92 is caused by the rotation of the gear 9
Transmitted to the shaft 42 of the brake device 4 via 7, 41,
Further, it is transmitted to the relay shaft 51 to which the manual switching device 5 is attached via the bevel gears 44 and 52. The rotation of the shaft 51 is transmitted via the gears 61 to 67 to the drive shaft 8 to which the gear 82 is attached, whereby the rack rod 10 meshed with the gear 82 is driven up and down,
A sluice door (not shown) attached to the lower end of the sluice is driven up and down.

As described above, in the rack type switchgear, the driving force of the motor 2 is transmitted to the rack rod 10 which is attached to the main body case 1 of the switchgear so as to be vertically movable through the power transmission mechanism such as the reduction gear mechanism 6. The sluice gate is opened and closed.

Here, as described above, the overload detection device of the present invention is provided in the power transmission mechanism for driving the opening and closing of the sluice door, and the driftgate is caught by the sluice gate, which makes it difficult to open and close the door. When the vehicle is closed, or when the sluice door is closed, a shock is detected and the drive source is stopped.

Next, the operation of the overload detection device will be described. First, when the motor 2 is driven in either direction according to the opening / closing of the door, the rotational force of the motor 2 causes the braking device 7 to rotate.
Is transmitted to the input shaft 91 of the overload detection device 9, and the input side bevel gear 94 rotates in one direction. As a result, the driven bevel gears 96, 96 meshing with the input side bevel gear 94 rotate, and the rotational force is transmitted to the output side bevel gear 95 on the other side. At this time, the rack shaft 10 is attached to the output shaft 92 via a power transmission mechanism such as the reduction gear mechanism 6.
Since a load is applied to the sluice door suspended in the area, a constant torque is always applied in the direction of closing the sluice gate. Therefore,
When the sluice door is opened, the driven bevel gear shaft 93, which supports the driven bevel gears 96, 96, is driven in the vertical direction (a surface perpendicular to the power transmission direction) due to the difference in torque between the input shaft 91 and the output shaft 92. However, since the rotation of the shaft 93 is suppressed by the pressing force of the spring 99 arranged on the side of the shaft 93, the driven bevel gears 96, 96 directly apply the torque applied to the input shaft 91 to the output shaft 92. Will be told. Therefore, this rotational force is transmitted to the rack rod 10 via the power transmission mechanism connected to the output shaft 92 side, and the sluice door is pulled up.

The closing of the sluice gate is also performed in the same manner as above by reversing the rotation direction of the motor 2. At this time, since the input shaft 91 connected to the motor 2 acts as a brake that prevents the door from falling due to its own weight,
The rotational force applied to the driven bevel gear shaft 93 is smaller than that when the sluice door is pulled up, but it does not affect the function of the power transmission mechanism that drives the sluice door.

In this way, the normal operation of opening and closing the water gate can be performed without any problems. When the floodgate does not move up and down smoothly due to trapping of driftwood or the like when the floodgate is opened and closed, resistance is applied to the output shaft 92 connected to the floodgate, so that the torque difference between the input shaft 91 is large. Therefore, a large rotational force acts on the driven bevel gear shaft 93 provided between the two. Therefore, the driven bevel gear shaft 93 rotates leftward or rightward against the biasing force of the springs 99, 99 pressing the side surfaces thereof, and the tip end thereof is provided in the power supply circuit for the motor 2. Contact the limit switch 98. As a result, the motor 2 is stopped and the water gate is stopped at that position. Therefore, thereafter, the motor 2 may be rotated in the reverse direction to remove the driftwood or the like that obstructs the opening and closing of the water gate, and the operation may be continued.

In this way, the overload detection device of the present invention detects an abnormality when the water gate is opened or closed and stops its operation. This abnormality is sensed by the resistance of the shaft that is connected to the sluice gate through the power transmission mechanism, so it can be easily activated by changing the biasing force of the spring that inhibits the rotation of the driven bevel gear with the adjusting screw. The setting value can be changed.

[0025]

As described above, the overload detecting device for a sluice gate opening / closing machine according to the present invention uses the rotational force received by the driven bevel gear shaft of the differential gear device provided in the power transmission mechanism to open / close the sluice gate. Since the overload is detected, the structure is simple and the device operates reliably during both opening and closing operations, improving the reliability of the device. In addition, power transmission efficiency is high and wear and noise are reduced, so maintenance is easy and
The sluice door can be opened and closed efficiently and smoothly, and there is no fear of disturbing the operation of the opening and closing device when it is urgent to open and close the sluice door such as in a flood. Furthermore, by changing the biasing force of the spring that elastically restricts the rotation of the driven bevel gear shaft, each overload set value can be easily adjusted when opening and closing the sluice door, making it easy to change the operating conditions. It has many excellent effects that can be dealt with.

[Brief description of drawings]

FIG. 1 is a cutaway side view of a main part of an embodiment.

FIG. 2 is a vertical sectional view of the same.

FIG. 3 is a side view of a sluice gate opening / closing machine incorporating the device of the present invention.

FIG. 4 is a partially cutaway front view of the same.

FIG. 5 is a transverse plan view of the same.

FIG. 6 is a simplified cross-sectional view of a conventional example.

[Explanation of symbols]

 1 Switchgear body case 1a Inner wall 1b Outer wall 1c Hollow part 2 Motor 3 Centrifugal brake device 4 Self-weight lowering control device 5 Manual switching device 6 Reduction gear mechanism 7 Braking device 8 Drive shaft 9 Overload detection device 10 Rack bar 91 Input shaft 92 Output Shaft 93 Driven bevel gear Shaft 94 Input side bevel gear 95 Output side bevel gear 96 Driven bevel gear 98 Limit switch 99 Spring 100 Adjustment screw 101 Spring retainer

Claims (1)

[Claims] 1. The power transmission mechanism of a rack type opening / closing device, wherein a sluice door attached to a lower end of a rack rod is moved up and down by driving a rack rod connected to a drive source through a power transmission mechanism. A differential gear device provided inside thereof, in which the tip of the shaft of a driven bevel gear arranged between the input side bevel gear and the output side bevel gear is formed to project, and a power transmission direction of the shaft provided on both sides of the shaft. The sluice gate is composed of a spring for suppressing the rotation of the shaft on a vertical surface, and a limit switch provided at a predetermined distance in both rotation directions of the shaft for stopping the drive source by abutting the shaft. An overload detection device for a floodgate opening / closing device, wherein a drive source is stopped by detecting an abnormality in the floodgate door by a resistance applied to a power transmission mechanism at the time of opening / closing.