KR20120043500A - Power transmission apparatus for bridge transport system - Google Patents

Abstract

PURPOSE: A power transmission device for an overhead moving apparatus is provided to stably brake the free-fall of a telescopic tube by installing a double brake which is operated by a worm gear box, a proximity sensor, or a limit switch. CONSTITUTION: A power transmission device for an overhead moving apparatus comprises a bevel gear shaft(20), a main clutch(40), an auxiliary clutch(41), a main motor(30), an auxiliary motor(31), a worm gear box(50), a driving gear(60), and a driving part sprocket. The bevel gear shaft is rotatably mounted on a trolley and comprises three bevel gears(21a,21b,21c). The main clutch and the auxiliary clutch selectively deliver power to two of the bevel gears installed in the bevel gear shaft. The main motor and the auxiliary motor deliver the power to the main clutch and the auxiliary clutch. The worm gear box receives the power through an input shaft connected in the bevel gear of the bevel gear shaft. The driving gear is connected with an output shaft of the worm gear box to receive the power. The driving part sprocket is formed with the driving gear in one body to wind a chain while rotating.

Description

Power Transmission Apparatus for Bridge Transport System

The present invention relates to a dual-axis z-axis power transmission device for a ceiling moving device, and more particularly, to a drive sprocket for controlling the lifting or lowering of the chain to stretch the telescopic tube moved from the ceiling moving device to the z axis. Worm gearbox and brakes are installed in the power transmission line. In particular, the present invention provides a braking force based on the worm and the worm gear structure of the worm gear box and the brake operated by the proximity sensor or the limit switch installed in close proximity to the clutch, so that even if the dual clutches are dropped at the same time, the telescopic tube falls freely by its own weight. The present invention relates to a z-axis redundant power transmission device for ceiling moving devices.

The ceiling moving device is a device for moving remote handling equipment and tools such as a servo manipulator to a desired position inside the hot cell.

These ceiling movers are the main modules of girders, trolleys, telescopic tubes, power and signal cable management systems, and remote handling equipment for moving in the hot cell in the x, y and z axes. And additional modules such as tool mounts, hoist cranes, and the like.

An example of an apparatus for moving a telescopic tube among the above-described ceiling moving apparatuses is shown in FIG. 1. As shown, the device for moving the telescopic tube 1 consists of a trolley 2 and a girder 3 for moving along the guide rail and moving the trolley. The telescopic tube is chained with the z-axis power train in the trolley so that the z-axis power train pulls up or down the chain connected to the telescopic tube to stretch in the z-axis direction.

Looking at the configuration of the conventional z-axis power transmission device as shown in Figure 2 drive sprocket (4) is rotated by receiving power to raise or lower the chain connected to the telescopic tube, and the drive gear integrally formed with the drive sprocket (5), a power transmission gear (6) engaged with the drive gear to transfer power to the drive gear, a main motor (7) and an auxiliary motor, which are dualized to transfer power to the power transmission gear in normal and emergency situations. (7a), and the main motor and the auxiliary motor is composed of a reverse clutch (8) and a forward clutch (8a) for receiving power by bevel gear and selectively coupled to the power transmission gear to transmit power.

Such a conventional z-axis power transmission device makes the work smoothly by transferring power by the auxiliary motor when the main motor can not transmit power by doubling the power transmission of the drive sprocket substantially involved in the z-axis expansion and contraction of the telescopic tube. It was to lose.

That is, normally, the reverse clutch received the power of the main motor is driven by transmitting power to the power transmission gear. When an abnormality occurs in the line, the reverse clutch is separated from the power transmission gear and the forward clutch is applied to the power transmission gear. In this case, power is transmitted from the auxiliary motor.

However, when the reverse clutch and the forward clutch fall on the power transmission gear at the same time, the means for supporting the chain connected to the telescopic tube is removed, thereby causing the telescopic tube to fall freely by its own weight. Of course, the other end of the chain is provided with a weight, but this also does not provide a braking force for free fall unless installed above the weight of the telescopic tube side.

Therefore, in addition to the method of increasing the weight of the weight, there is a need for a study that can prepare for safety accidents such as free fall by changing the structure of the power transmission line.

The z-axis dual power transmission device for ceiling moving apparatus according to the present invention,

A worm gearbox having a worm and a worm gear structure in the power transmission line and a close proximity installed in the clutch to prevent the telescopic tube from falling freely due to its own weight when the doubled clutches are detached at the same time from the power transmission line that stretches the telescopic tube. It aims to provide braking force by installing a brake acting as a sensor or a limit switch.

Z-axis dual power transmission device for ceiling moving apparatus of the present invention for solving the above problems,

Power transmission to stretch the telescopic tube in the z-axis direction by pulling up or down the chain connected to the telescopic tube in a ceiling mover consisting of a trolley for moving the telescopic tube and a girder moving along the guide rails for moving the trolley. An apparatus, comprising: a bevel gear shaft rotatably mounted to a trolley and provided with three bevel gears; A main clutch and an auxiliary clutch for selectively transmitting power to two bevel gears respectively installed on the bevel gear shaft; A main motor and an auxiliary motor for transmitting power to the main clutch and the auxiliary clutch; A worm gear box which receives power from an input shaft connected to the bevel gear of the bevel gear shaft; A drive gear connected to the output shaft of the worm gear box to receive power; And a drive unit sprocket formed integrally with the drive gear and winding the chain by rotation.

As described in detail above, the z-axis dual power transmission device for ceiling moving apparatus of the present invention,

Braking means are installed in the power transmission line to the drive sprocket that pulls up or down the chain to stretch the telescopic tube moving on the z-axis, thereby preventing the telescopic tube from falling freely due to its own weight even if both dual clutches are dropped at the same time. It is effective in preventing accidents.

In addition, the braking means includes a worm gear box having a worm and a worm gear structure and a brake operated by a proximity sensor or a limit switch installed in close proximity to the clutch to provide a device capable of stably braking against free fall of the telescopic tube. This is possible.

1 is a perspective view showing a conventional ceiling moving device.
Figure 2 is a perspective view of a conventional z-axis dual power transmission device for ceiling moving apparatus.
Figure 3 is a perspective view schematically showing a z-axis redundant power transmission device according to the present invention.
4 is a plan view of a z-axis redundant power transmission device according to the present invention.
Figure 5 is a schematic diagram showing a coupling state of the chain and the sprocket in accordance with an embodiment of the present invention.
Figure 6 is a working state of the worm gear box according to an embodiment of the present invention.
Figure 7 is a side view showing a brake device according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with the accompanying drawings.

The z-axis redundant power transmission device according to the present invention pulls up or down a chain connected to a telescopic tube in a ceiling moving device composed of a trolley for moving a telescopic tube and a girder moving along a guide rail to move the trolley. Telescopic tube stretches in the z-axis direction.

3 and 4, the power transmission device 10 of the present invention is rotatably mounted to the trolley 90 and has a bevel gear shaft 20 provided with three bevel gears 21a, 21b, and 21c. ; A main clutch 40 and an auxiliary clutch 41 for selectively transmitting power to the two bevel gears 21b and 21c respectively installed on the bevel gear shaft; A main motor 30 and an auxiliary motor 31 for transmitting power to the main clutch and the auxiliary clutch; A worm gear box 50 which receives power from an input shaft 51 connected to the bevel gear 21a of the bevel gear shaft; A drive gear 60 connected to the output shaft of the worm gear box to receive power; And a drive part sprocket 70 formed integrally with the drive gear and winding the chain 91 by rotation.

Both ends of the bevel gear shaft 20 are rotatably installed on the trolley 90, and bevel gears 21a, 21b, and 21c are installed inside the bevel gear shaft 20. The bevel gear may be a flat bevel gear as shown, but a helical type bevel gear box may be used for maintenance of noise reduction and lubrication oil supply. Among the three bevel gears shown, the center bevel gear 21a is engaged with the input shaft 51 of the worm gear box 50, and the bevel gears 21b and 21c on both sides are the main clutch 40 and the auxiliary clutch 41. Meshes with the clutch bevel gear 34. That is, when the main clutch 40 is normally connected, and if a problem occurs in the power line of the main clutch, the main clutch is spaced apart and the power line of the auxiliary clutch 41 is connected to allow the bevel gear shaft to rotate.

Both bevel gears 21a and 21b of the bevel gear shaft 20 are selectively engaged with the main clutch and the auxiliary clutch of the main power line and the auxiliary power line to transmit rotational power to the bevel gear shaft.

The main power line is composed of the main motor 30 and the main clutch 40 which are installed on the same axis, the reduction gear 33 may be further mounted between the main motor and the main clutch. Clutch bevel gears 34 engaged with the bevel gears 21b of the bevel gear shaft are mounted at the ends of the main clutch 40 so that the fixed parts and the moving parts inside the main clutch are connected or spaced to each other. Ensure delivery exists.

In addition, the auxiliary power line is also made up of the auxiliary motor 31, the reducer 33 and the auxiliary clutch 41 in the same way as the main power line, the clutch bevel gear 34 is mounted on the auxiliary clutch end of the main power line When the power transmission is separated from the bevel gear shaft, the power transmission by the connection of the auxiliary clutch fixing part and the moving part is performed instead.

The worm gear box 50 includes an input shaft 51 on which a worm 53 is formed, and an output shaft 52 on which a worm wheel 56 is meshed to be orthogonal to the worm. A bevel gear 54 is installed at one end of the input shaft 51 to be engaged with the bevel gear 21a installed in the center of the bevel gear shaft 20. The input shaft 51 and the bevel gear shaft 20 are always meshed by two bevel gears 21a and 54 so that power can be transmitted from the main motor or the auxiliary motor. In addition, the power transmission gear 55, which is a spur gear, is integrally coupled to the output shaft 52 end of the worm gear box to rotate with the power transmitted from the input shaft.

The drive sprocket 70 receives power from the power transmission gear 55 coupled to the output shaft 52 of the worm gear to pull up or push down the telescopic tube. Such a drive sprocket may be integrally coupled with the power transmission gear and rotated, or may be integrally coupled to the drive gear 60 engaged with the power transmission gear, as shown, to allow rotation. In this case, the drive gear may have a larger diameter than the power transmission gear so that the telescopic tube can be easily stretched by increasing the force instead of reducing the rotation speed.

In addition, the driving unit sprocket 70 may be used alone, but as shown in FIG. 5, an idle sprocket 71 is further mounted to space the distance between both ends of the chain wound by the sprockets 70 and 71. You can do that. That is, one end of the chain is coupled to the telescopic tube, the other end is connected to the weight, so that the two members are separated by the drive sprocket 70 and the idle sprocket 71 so that the lifting can be easily performed. In addition, although not shown, the idle sprocket and the drive gear are rotatably coupled to the stationary plate, and the stationary plate is coupled to the trolley to allow each member to be positioned.

When the worm gear box 50 is mounted in the power transmission process as in the present invention, even if the main clutch 40 and the auxiliary clutch 41 are separated from the bevel gear shaft 20 at the same time, the telescopic tube can be prevented from falling freely by its own weight. Can be.

That is, when the main clutch 40 and the auxiliary clutch 41 are separated from each other, the telescopic tube tries to free fall downward by its own weight. This load is transmitted to the drive gear 60 to which the chain 91 is coupled, and the load transmitted to the drive gear is transmitted to the worm wheel 56 of the worm gearbox output shaft 52 through the power transmission gear 55. However, since the worm wheel 56 is formed in the direction in which the worm wheel 56 rotates as shown in FIG. 6, the rotation of the worm wheel is blocked by the worm, thereby preventing free fall of the telescopic tube.

Meanwhile, in addition to braking by the worm gear box, a brake device may be further installed.

3, 4 and 7, the brake device 80 is installed at one end of the input shaft of the worm gear box. For example, one end of the input shaft 51 of the worm gear box is engaged with the bevel gear shaft 20, and the other end protrudes out of the worm gear box so that the brake device 80 is mounted at the end thereof. In addition, the protruding input shaft 51 is rotatably coupled to the bearing 921 to the support plate 92 fixed to the trolley 90.

As an example of the brake device 80, the disk 81 is fixed to the outer peripheral surface of the end side of the input shaft 51, and the brake body 82 is fixed to the support plate 92 by including the disk And a pressure plate 83 installed in the brake body to pressurize the disk.

In this configuration, the pressure plate 83 may be pressed by hydraulic or pneumatic pressure, such as a brake of an automobile, or the pressure plate 83 may be pressed by the elasticity of the spring portion 821 as shown in FIG. 81) and one side thereof may be provided in a structure that separates the pressing plate from the disk by the magnetic force of the magnetic force part 822. FIG. In addition, a pad 84 may be mounted on the disk surface or the pressure plate surface on which the interview is performed to prevent wear of the disk or pressure plate due to braking.

This structure is interrupted by the elastic force of the spring portion 821 by temporarily removing the magnetic force by interrupting the power supply of the magnetic force portion 822 when the main clutch 40 or the auxiliary clutch 41 is separated from the bevel gear shaft 20. The pressure plate 83 is brought into contact with the disk 81 to make braking. In other words, when the power supply to the main motor is cut off due to power failure or disconnection, the magnetic power of the brake unit is automatically cut off to allow braking.

In addition, a variety of methods may be applied, such as charging the MR fluid having magnetic force in the space between the brake body and the disc and supplying power when necessary to solidify the MR fluid.

In addition, the operation of the brake device 80 may be operated by the proximity sensor or the limit switch 32. The proximity sensor or limit switch is installed on the main clutch 40 and the auxiliary clutch 41, respectively, and detects when the main clutch or the auxiliary clutch, which transfers power to the bevel gear shaft 20, is dropped so that the brake device is operated. When one side clutch is engaged again, the brake of the brake device may be released to smoothly supply power.

10: power train
20: Bevel Gear Shaft
21a, 21b, 21c: Bevel Gears
30: main motor
31: auxiliary motor 32: limit switch
33: reducer 34: clutch bevel gear
40: main clutch
41: auxiliary clutch
50: Worm Gear Box
51: input shaft 52: output shaft
53: Worm 54: Bevel Gear
55: power transmission gear 53: worm wheel
60: drive gear
70: drive sprocket
71: Children Sprockets
80: brake device
81: disc 82: brake body
83: pressure plate 84: pad
821: spring portion 822: magnetic force portion
90: trolley
91: chain 92: support plate
921: Bearing

Claims (5)

Power transmission to stretch the telescopic tube in the z-axis direction by pulling up or down the chain connected to the telescopic tube in a ceiling mover consisting of a trolley for moving the telescopic tube and a girder moving along the guide rails for moving the trolley. In the device,
A bevel gear shaft 20 rotatably mounted to the trolley 90 and provided with three bevel gears 21a, 21b, and 21c;
A main clutch 40 and an auxiliary clutch 41 for selectively transmitting power to the two bevel gears 21b and 21c respectively installed on the bevel gear shaft;
A main motor 30 and an auxiliary motor 31 for transmitting power to the main clutch and the auxiliary clutch;
A worm gear box 50 which receives power from an input shaft connected to the bevel gear 21a of the bevel gear shaft;
A drive gear 60 connected to the output shaft 52 of the worm gear box to receive power;
And a drive unit sprocket (70) formed integrally with the drive gear to wind the chain (91) by rotation. The method of claim 1,
The worm gear box 50,
A bevel gear 54 is installed at the end of the input shaft 51 on which the worm 53 is formed to be engaged with the bevel gear 21a of the bevel gear shaft.
A power transmission gear 55 is installed at the other end of the output shaft 52 having a worm wheel 56 formed at one end thereof so as to be engaged with the drive gear. The method of claim 1,
The input shaft 51 of the worm gear box 50 is rotatably installed at the support plate 92 fixed to the trolley 90 at the other end of the end contacting the bevel gear shaft 20. Z-axis dual power transmission device for a ceiling moving device, characterized in that 80) is further installed to brake the rotation of the input shaft. The method of claim 3,
The brake device 80
A disk 81 installed on an outer circumferential surface of the end portion of the worm gear box input shaft 51 supported by the support plate 92;
A brake body (82) containing the disc and fixed to the support plate;
Z-axis dual power transmission device for a ceiling moving device, characterized in that it comprises a; is installed in the brake body pressure plate (83) for pressing the disk. The method of claim 3,
Proximity sensors or limit switches 32 and 42 are installed close to the main clutch 40 and the sub clutch 41 so that the brake device is operated when the main clutch or the sub clutch coupled to the bevel gear shaft 20 drops. Z-axis dual power train for ceiling moving device.

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