JPH06179588A - Elevating device - Google Patents

Abstract

PURPOSE:To reliably prevent a device main body from being dropped by meshing sprockets with each other from both sides of elevating rails and to urgently stop the device main body safely by operating an electromagnetic brake when the descending speed of the device main body exceeds the fixed value. CONSTITUTION:A device main body 1 is fitted in the lower end position R1 of respective elevating rails 4, 5 arranged in a steel tower 25, etc., and respective elevating guide rings 16 are fitted into respective guide grooves 6 of a rail main body R, and also respective sprockets 7 to 10 are meshed with respective elevating rails 4, 5. A hydraulic motor 2 is, for example, normally rotated, thereby respective sprockets 7, 8 are rotated through a driving gear 3, and also respective sprockets 9, 10 are rotated through respective gears 11 to 14. Thereby the device main body 1 is, for example, raised along respective elevating rails 4, 5. At this time, the descending speed of the device main body 1 is detected, and the detected value and the reference value are compared with each other. As a result of this comparison, when the detected value exceeds the reference value, an electromagnetic brake 35 is operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating device used for elevating a steel tower for electric wires or a wall surface of a building.

[0002]

2. Description of the Related Art In order to go up to a steel tower for electric wires for maintenance and construction, it is not only based on human power until now, but climbing up and down while carrying tools and materials on a high tower requires considerable labor, Especially in windy weather, this is a dangerous work. Therefore, for the purpose of reducing the labor of the worker,
A lifting device has been proposed as shown in FIGS. 8 and 9. In this lifting device, a sprocket 52 driven by a power source 51 on the device body 50 side meshes with a lifting rail 53 fixed to the steel tower 25, and guide grooves 53a provided on both sides of the rail 53 are connected to the body 50 side. The wheels 54 are fitted.

[0003]

However, in such a lifting device, one sprocket 52 is used for the lifting rail 5.
However, if the sprocket 52 is disengaged from the rail 53 due to some trouble, the lifting device becomes inoperable, and if the safety device does not work, there is a risk of falling.

The present invention has been proposed in order to solve the problems of the conventional technique, and an object thereof is to provide a lifting device excellent in safety.

[0005]

In order to achieve this object, a lifting device according to the present invention comprises two left and right lifting rails having meshing holes for sprockets formed at equal intervals on a longitudinal side surface thereof. Installed on an object to be lifted and lowered, the device body integrally has a rotation drive source and a gear with which a drive gear fixed to the output shaft of this rotation drive source meshes. The first sprocket that meshes with the
Has a gear that meshes with the gear of the other sprocket and that meshes directly with the second sprocket that meshes with the meshing hole of the lifting rail on the other side and the drive gear or the gear of the first sprocket or the gear of the second sprocket. Non-energizing electromagnetic brake that engages indirectly, speed detecting means that detects the descending speed of the main body of the device, comparison circuit that compares the detection output of this speed detecting means with a reference value, and the comparison result of this comparison circuit And a control circuit for setting the electromagnetic brake in a braking state when it is determined that the descending speed of the apparatus body exceeds a certain value.

[0006]

According to the above-mentioned structure, the first sprocket is rotated by the rotary drive source and the second sprocket is rotated by the first sprocket, so that the lifting device is rotated in accordance with the rotation direction of the rotary drive source. The body can be raised or lowered with respect to the two lifting rails with which the first and second sprockets are respectively meshed. Further, when the lifting / lowering device body descends at a certain speed or higher due to a malfunction, the electromagnetic brake is brought into a braking state, and the device body is stopped.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the lifting device according to the present invention will be described in detail below with reference to the drawings. In the front view of FIG.
An example of this lifting device is shown. In this figure, this lifting device is rotated by a hydraulic motor 2 serving as a rotation drive source attached to the device main body 1 and a drive gear 3 of the hydraulic motor 2, and upper and lower sprockets 7 meshing with a lifting rail 4 on one side. , 8 and gears 13, 14 are sprockets 7, 8
The upper and lower sprockets 9 and 10 which are driven by meshing with the gears 11 and 12 on one side and mesh with the elevating rail 5 on the other side.
The electromagnetic brake 35, which operates when the apparatus main body 1 descends at a certain speed or more, and the elevating guide wheels 16 and 16 mounted in the left and right guide grooves 6 and 6 of the rail main body R are generally configured. On the front surface of the apparatus main body 1, a basket serving as a boarding space for workers is attached.

As shown in FIG. 2, the hydraulic motor 2 is mounted on the front plate 1A of the apparatus main body 1 in the front-rear direction by bolts 18 so that the output shaft 2a faces inward. The output shaft 2a has a drive gear. 3 is firmly attached using a fall prevention metal fitting 19. Further, as shown in FIG. 3, the front plate 1 assembled by the bolts 21 via the spacers 20.
Sprockets 7 and 8 integrally provided with large-diameter gears 11 and 12 meshing with the drive gear 3 are rotatably mounted above and below the hydraulic motor 2 by bearings 22 between A and the back plate 1B. Reference numeral 23 is a bearing retainer. On the right side of the sprockets 7 and 8, the gear 1 of the same shape that meshes with the gears 11 and 12 of the sprockets 7 and 8 is provided.
Sprockets 9 and 10 integrally provided with 3 and 14 are rotatably attached by a bearing 22 between the front plate 1A and the rear plate 1B. Here, on the outer periphery of each sprocket 7, 8, 9 and 10, there are a large number of substantially arc-shaped feed teeth 7a, 8a, 9a and 10a which are fitted into the meshing holes 4a and 5a of the lifting rails 4 and 5, respectively. It has been planted. The sprockets 7 and 8 form a first sprocket, and the sprockets 9 and 10 form a second sprocket.

Between the support plates 15 fixed to the rear plate 1B by bolts 24, a pair of left and right elevating guide wheels 16, 16 are rotatably mounted on a shaft 17 as shown in FIG. There is. These lifting guide wheels 16, 16 are
They are provided at the upper and lower positions of the back plate 1B, respectively.

Further, the rail body R is fixed to a steel tower 25 on which, for example, an electric wire is installed, as shown in FIG. In this rail body R having a channel shape, the back plate serves as a mounting plate for a steel tower or the like, and the left and right side plates rising from both sides of the back plate are vertically engaged with the holes 4a, 5a.
Constitute elevating rails 4 and 5 which are formed at equal intervals. Further, by bending the front edges of these side plates inward, guide grooves 6 and 6 for raising and lowering are formed on the left and right.

Next, the structure related to the electromagnetic brake 35 will be described. As shown in FIG. 5, a non-energized electromagnetic brake 35 is attached to the front plate 1A, and the gear 3 fixed to the braking shaft 35a of the electromagnetic brake 35 is attached.
6 meshes with the gears 13 and 14. Normally, the electromagnetic brake 35 is energized, and the braking is released. Further, the braking shaft 3 of the electromagnetic brake 35
A disc 37 for detecting the number of revolutions, which has a large number of through holes formed in the outer peripheral portion thereof, is fixed to 5a. A photo coupler 38 is attached to the tip of a post 39 protruding from the inner surface of the back plate 1B, and the photo coupler 38 sandwiches the outer edge of the disc 37. This photo coupler 3
The detection output of 8 is converted to a DC level by the speed detection circuit 40, and then sent to the comparison circuit 42. In the comparison circuit 42, the speed detection signal is compared with the reference value 41, and the comparison result is sent to the control circuit 43 (see FIG. 7). When the control circuit 43 recognizes that the lifting / lowering apparatus main body 1 has started to descend from the rotation speed of the braking shaft 35a of the electromagnetic brake 35 at a speed exceeding a certain speed, the control circuit 43 sends the brake release signal sent to the brake drive circuit 44. Stop, electromagnetic brake 35
To the braking state. Here, the disk 37 and the photo coupler 3
8 and the speed detection circuit 40 constitute the descent speed detection means of the apparatus body 1.

Next, the hydraulic circuit shown in FIG. 7 will be described.
A hydraulic pump 27 connected to the oil tank 26 is driven by a DC motor 30 which is supplied with power from a battery 28 via a drive circuit 29, and a discharge pipe of the hydraulic pump 27 is connected to a P port of an open center type switching valve 31. Connected. The T port of the switching valve 31 is connected to the oil tank 26 via the relief valve 32. The A port of the switching valve 31 is connected to the hydraulic motor 2 via a flow rate control valve 33 and an operation check valve 34. The hydraulic motor 2 is connected to the B port of the switching valve 31, and the T port of the switching valve 31 is connected to the oil tank 26.
In this hydraulic circuit, the control circuit 43 that receives the operation command signal
When the switching valve 31 is switched by the valve drive circuit 45 and the flow path S1 is selected, the operation check valve 34 is opened, and the hydraulic motor 2 is moved upward and downward by the rotation speed determined by the flow control valve 33. Will be rotated forward. The flow control valve 33 is controlled by the control circuit 43. On the other hand, the switching valve 31 is switched so that the flow path S2
Is selected, the hydraulic motor 2 is rotated in the reverse direction.

Next, the operation of the lifting device constructed as above will be described. First, the device body 1 is fitted into the lower end positions of the lifting rails 4 and 5 installed on the steel tower 25 and the like, and the lifting guide wheels 16 and 16 are mounted in the guide grooves 6 and 6 of the rail body R, and the sprockets 7 and 8 are attached. And 9 and 10 are engaged with the lifting rails 4 and 5. In this state,
When the hydraulic motor 2 is rotated in the normal direction, the drive gear 3 rotates the sprockets 7 and 8, and the sprockets 9 and 10 in which the gears 13 and 14 mesh with the gears 11 and 12 on the side of the sprockets 7 and 8 are rotated to move up and down. Rail 4,
The apparatus main body 1 rises along 5. At this time, since the lifting guide wheels 16 and 16 roll in the guide grooves 6 and 6, the device main body 1
There is no back-and-forth swing. Further, when the hydraulic motor 2 is rotated in the reverse direction, the sprockets 7, 8, 9 and 10 are respectively rotated in the reverse direction, so that the apparatus main body 1 can lower the elevating rails 4 and 5.

In this lifting device, the left and right lifting rails 4 are
And 5 from both sides with sprockets 7, 8 and 9, 10
Are engaged with each other, so the sprockets 7, 8, 9,
10 runs stably on rails 4 and 5, and there is no danger of derailing. Further, even if the hydraulic circuit fails for some reason, the operation check valve 34 works to cause the hydraulic motor 2 to operate.
Since the hydraulic oil is prevented from flowing out from the hydraulic motor 2, the hydraulic motor 2 is stopped, and there is no risk that the lifting / lowering device body 1 will slide down. Further, even if a failure occurs in the hydraulic motor system, the dual safety function of the electromagnetic brake 35 operates. That is, the detection output of the photocoupler 38 and the reference value 4
When it is detected by the comparison circuit 42 that compares 1 with 1 that the lifting device main body 1 starts to descend at a certain speed or higher, the control circuit 43 shuts off the energization to the electromagnetic brake 35 and brakes the brake 35. State. As a result, the rotation of the sprockets 9 and 10 in which the brake-side gear 36 and the gears 13 and 14 mesh with each other is stopped, and the gears 11 and
By stopping the rotation of the sprockets 7 and 8 via 12, the apparatus main body 1 is emergency stopped on the lifting rails 4 and 5.

In the above-described embodiment, the hydraulic motor 2 is used as the rotary drive source, but a configuration using a DC motor or a small internal combustion engine is also possible. Further, the lifting rails 4 and 5 are arranged outside the sprockets 7, 8 and 9, 10, but the two lifting rails 4, 5 are sandwiched between the sprockets 7, 8 and the sprockets 9, 10. , Sprockets 7, 8 and 9, 10 may be placed inside. Further, it is also possible to use a structure in which only the sprockets 7 and 9 are moved up and down without using the sprockets 8 and 10.

When the elevator is used for maintenance or construction at a steel tower for electric wires, etc., it may be transported to the site each time, but it should be stored in an equipment hut installed beside the steel tower and stored when necessary. If you take it out from the equipment hut and use it, you can save the trouble of transportation. Further, this lifting device is suitable not only for lifting and lowering a steel tower, but also for lifting and lowering a building wall surface when cleaning a building window.

[0017]

As described above, according to the present invention, 2
Since the sprocket is engaged from both sides of the lifting rail of the strip, unlike the conventional case where the sprocket is engaged with one lifting rail, there is no risk of the sprocket derailing from the lifting rail. You can safely raise and lower steel towers. In addition, when the lifting device body tries to lower the lifting rail rapidly due to a failure of the drive system, etc., the electromagnetic brake enters a braking state and the lifting device body is stopped urgently, so an accident is avoided in advance. be able to.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a lifting device according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a CC diagram of FIG. 1.

5 is a DD diagram of FIG. 1. FIG.

FIG. 6 is a front view showing a lifting rail installed on a steel tower.

FIG. 7 is a hydraulic circuit diagram including a drive electric circuit system used in the lifting device.

FIG. 8 is a front view of a conventional lifting rail.

FIG. 9 is a bottom view schematically showing a conventional lifting device.

[Explanation of symbols]

 1 Device Main Body 2 Hydraulic Motor 2a Output Shaft 3 Drive Gear 4,5 Lifting Rails 4a, 5a Engagement Hole 6 Guide Groove 7, 8, 9, 10 Sprocket 11, 12, 13, 14 Gear 15 Support Plate 16 Lifting Guide Wheel 17 Support shaft 20 Spacer 22 Bearing 23 Bearing retainer 25 Steel tower 26 Oil tank 27 Hydraulic pump 28 Battery 29 Drive circuit 30 DC motor 31 Switching valve 32 Relief valve 33 Flow control valve 34 Operate check valve 35 Electromagnetic brake 36 Braking shaft 37 For speed detection Disk 38 Photo coupler 40 Speed detection circuit 41 Reference value 42 Comparison circuit 43 Control circuit

Claims (2)

[Claims] 1. Two left and right lifting rails having meshing holes for sprockets formed at equal intervals on a longitudinal side surface thereof are installed on an object to be lifted, and a lifting drive body is provided with a rotary drive source. , A first sprocket that meshes with a drive gear fixed to the output shaft of the rotary drive source, meshes with a meshing hole of the one-side lifting rail, and meshes with the gear of the first sprocket A second sprocket that integrally has a gear and that meshes with a meshing hole of the lifting race on the other side, and an electromagnetic brake that meshes directly or indirectly with the drive gear or the gear of the first sprocket or the gear of the second sprocket. A speed detecting means for detecting the descending speed of the lifting device main body, a comparison circuit for comparing the detection output of the speed detecting means with a reference value, and the lowering of the lifting device main body based on the comparison result of the comparison circuit. Degrees is lifting apparatus characterized by a control circuit for the electromagnetic brake and the braking state is provided when it is determined that exceeds a certain value. 2. The elevating device according to claim 1, wherein the electromagnetic brake is constituted by an electromagnetic brake that is operated when not energized.