JPS6250706B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a closed housing for a belt power transmission machine to significantly facilitate maintenance and adjustment operations such as belt replacement and belt tension adjustment.
More specifically, the present invention relates to a sealed housing for a belt transmission that increases and decreases in two stages.

Originally, belt transmission machines require periodic belt replacement, but in reality, even just this replacement and maintenance work involves taking up the rotating shaft, fixing the bearing, and adjusting the belt tension. It becomes necessary. However, since heavy equipment is usually connected to each shaft, the work is extremely complicated. Therefore, in order to solve this problem, a two-stage belt transmission system has been proposed in which an intermediate shaft is interposed, even though a single-stage belt transmission machine can transmit a predetermined power. However, when such a power transmission device is installed in a hazardous area under adverse conditions such as high humidity or dust, it is necessary to seal the device and extremely simplify various maintenance operations. be.

However, in reality, such a closed-type two-stage transmission requires the installation of a heat-insulating fan in a closed room, the belt tension adjustment between the first and second stages, and the need for a tension pulley. This pulley back pressure adjustment is also required when adding . Furthermore, when the housing of the two-stage transmission is used not as a simple two-stage constant increase/decrease machine but as a transmission, an additional operation for connection with a separate control electric part is required. Moreover, although it is desirable to perform all of these tasks at the same time on site, in reality, as the number of work steps increases, efficiency decreases significantly, so the product may be returned to the factory. For this reason, there has been a demand for a transmission housing that is specially designed to allow these operations such as replacement, installation, and adjustment to be performed at the same time.

The present invention has a function of making it easier to fix the support for stably supporting the intermediate shaft during normal operation in a two-stage belt transmission machine, and at the same time improving workability during maintenance work such as replacing the upper and lower belts. It is an object of the present invention to provide a power transmission sealed housing that simultaneously achieves both functions.

One embodiment will be described below with reference to the drawings.

FIG. 1 shows a longitudinal cross-section of a two-stage belt transmitter in which a variable diameter belt transmitter B is built into the first stage and a constant belt reducer C is built into the second stage in the housing 10. It shows a top view. Note that the first stage may be a constant belt speed reducer like the second stage. In the figure, 11 is an input rotating shaft connected to a power source such as an electric motor, 12 is an intermediate rotating shaft, and 13 is an output rotating shaft to which a load such as a blower fan is attached. 11,1
Variable diameter pulleys 21 and 22 and constant speed ratio pulleys 23 and 24 are arranged at 2 and 13,
The belts 18 and 19 constitute a two-stage belt transmission, which is housed in a sealed housing chamber 20 formed by an oval box-shaped sealed frame 14 and a lid 15. The external shape of this housing 10 is not limited to an ellipse. The variable diameter pulleys 21 and 22 are fixed pulleys 21a and 22a, respectively.
and sliding pulleys 21b and 22b. The intermediate shaft 12 is supported by a holder 25, and fixed arms 29a, 29b, and 29c extending in three directions protrude from the holder 25. It is bolted and fixed in correspondence with each of the three stand bases 26a, 26b and 26c. Furthermore, the input and output shafts 11 and 12 are supported by flanges 16 and 17, respectively.

On the other hand, as shown in FIG. 2, a blower heat insulating device 30 is provided on the inner wall of one side wall portion 14a of the box-shaped frame body 14 and protrudes outside the frame body, and a blower device, that is, a Sirotsko cooling blower 31 is attached thereto. There is. Although a centrifugal blower device is shown here,
An axial blower device may be used as long as a high static pressure can be maintained in the room 20. The rotary shaft 32 of the blower 31 is also equipped with a small diameter pulley 33, and a round belt 41 is wound around the large diameter pulley 42 provided above the drive side fixed pulley 21a. It is configured to be able to rotate at approximately 3000 r/p/m or more depending on the power. Note that the air in the room 20 is supplied to the inlet 14j of the housing 14 (Fig. 3).
The gas is introduced through the exhaust hole 47 of the exhaust section 45 provided in the lid 15, and is cooled.

On the other hand, a pilot control section 35 for controlling the drive-side variable pulley is installed on the other side wall 14b of the box-shaped frame 14, and a recycling motor 36 with a built-in gear reducer is fixed to a mounting base 37. The motor output is transmitted to the variable pulley 2 via the chain 38.
It is connected to a sprocket 39 assembled to 1. This recycle motor 36 performs speed change control.

Furthermore, a support arm 5 of a tension pulley 54 is attached to the column 52 that stands upright from the elliptical protruding bottom portion 14c.
3 is provided, and the support arm 53 is pressed by a coil spring 55 provided coaxially with the pressing shaft 56,
This brings the pulley 54 into pressure contact with the back of the second stage belt 19. The pressing force by the coil spring 57 is adjusted by rotating the screw 57.

Next, a holder 25 is integrally assembled in advance in the center of the intermediate shaft 12, to which the variable driven pulley 22 is attached to the upper end and the small diameter pulley 24 is attached to the lower end, and this integral assembly A can be removed from the semi-elliptical opening 14d provided on the right side of the housing 10. In addition, in order to adjust the distance between the input/output shafts 11 and 13 and the intermediate shaft 12 when this assembly A is installed, a take-up mechanism is provided at the end of the protruding bottom portion 14c of the housing 10. There is an upright adjustment column 60 and a bolt 61, and the bolt 61 is screwed into a screw hole 62 provided on the back surface of the support 25 to enable manual take-up.

FIG. 3 shows a perspective view of a housing 10 for housing such a belt transmission. The housing 10 of this embodiment has an elliptical cylinder shape as a whole, and is opened in an L-shape leaving a semi-elliptical protruding bottom part 14c so that the above-mentioned intermediate shaft assembly A can be attached and detached from above. Frame body 1 having apertures 14d
4, and a lid 15 that closes the opening 14d. Three bolts 27a, 27b and 27c are embedded in the protruding bottom part 14c, respectively.
Three upright pillars 26a, 26b and 26c protrude. On the other hand, the bottom side edge 14e is provided with a tension pulley installation protrusion 14f and a spring pressure adjustment part 14c for the tension pulley.

In the housing 10 having such a configuration, the frame body 1
4, a flange 16 of an electric motor or the like is attached to the pulley 21 in the upper circular hole portion 14h, and the lower circular hole portion 1
A flange 17 with a pulley 23 is attached to each of the flanges 4i from the outside. Next, the above-mentioned intermediate shaft assembly A is installed from above this opening 14d. This situation is shown in Figure 3. Intermediate shaft support 25
has elongated holes 29d, 29e and 29f formed in the fixed arms 29a, 29b and 29c, respectively.
are opened corresponding to the bolts 27a, 27b and 27c, respectively, so that the support 2
5 is temporarily fixed to the standing pillars 26a, 26b and 26c with nuts. Thereafter, the upper belt 18 and the three lower belts 19 are wrapped around each other using the space between the shafts.

After completing this installation, the frame body side wall portion 14a,
The chain 38 and belt 41 connecting the drive pulley 21 to the control mechanism 35 and heat insulation mechanism 30 installed in the frame 14b are attached through the frame opening 14d.

Next, the tension pulley 54 installed in advance is temporarily pressed against the belt 19, and the winding adjustment of the take-up mechanism 60 by the bolt 61 is performed at the opening 1.
4d, nuts 28a, 28b and 2
8c is completely fixed. Thereafter, the housing 10 is bolted to the lid 15.

As described above, in the housing of the present invention, by providing the intermediate shaft assembly A with the installation part, that is, the opening part, it is possible to perform belt wrapping operations, adjustment between the shafts, and adjustment of the connection between the control mechanism, the heat insulation mechanism, and the pulley. All maintenance and adjustment work required for the transmitter, such as replacing parts, can be performed at once on site by using this opening 14d, especially when installed in a hazardous location such as an air blower. can significantly improve work efficiency.

[Brief explanation of the drawing]

FIG. 1 shows a longitudinal cross-sectional view of a power transmitter using a housing according to an embodiment of the present invention, and FIG. 2 shows a cross-sectional view of the power transmitter taken along the - line in FIG. 1. , FIG. 3 shows an exploded perspective view of the housing used in the transmission, and FIG. 4 shows a perspective view of the intermediate shaft assembly installed to show how the housing is used. . In the figure, 10...housing, 11, 12 and 13...input shaft, intermediate shaft and output shaft, 14...
Frame body, 14a and 14b...Side wall portion, 14c...
...Protruding bottom part, 14d...Opening part, 15...Lid body,
30...Heat insulation device, 35...Control device, 50...
Tension adjustment device, 60...Take-up device, A...
...Intermediate shaft assembly, B...First stage transmission section, C...Second stage transmission section.

Claims (1)

[Claims] 1 A first-stage belt transmission device consisting of a pulley body and a belt is installed between the input shaft and the intermediate shaft, and a second-stage belt transmission device consisting of a pulley body and a belt is built-in between the intermediate shaft and the output shaft, respectively, and input/output is performed. A sealed housing for a two-stage belt power transmission machine whose shafts are located substantially coaxially, the housing having a horizontal cross-sectional shape of a substantially elliptical shape, a vertical cross-sectional shape of a substantially rectangular shape, and a support for the intermediate shaft. An opening is provided above the protruding bottom to which the supporting body is fixed, and is provided with an opening to allow the supporting body to be attached and removed from the installation part arranged to install the supporting body together with the intermediate shaft with the pulley body attached to the protruding bottom. A frame and
It has a lid for closing the frame opening,
Further, the lid body has a D-shaped planar shape and a substantially rectangular side shape, and has a pulley body loaded on the intermediate shaft of the first stage belt transmission device, the support body, and a take-up of the support body. A power transmission sealed housing characterized in that the device has a side surface height that is substantially exposed when the lid is opened.