JPS62147154A - Belt extension adjuster for double power transmission device - Google Patents

Abstract

PURPOSE:To make such power transmission that is stable in rotation with no slip attainable, by installing a take-up unit, a tension indication adjusting device and a pilot controller as three devices for belt extension. CONSTITUTION:A countershaft builtup body A assembled with both driven and driving pulleys 22 and 24 and a holding body 24 handles each elongation of upper and lower belts 18 and 19 with a take-up unit 60, balancing each tension of them. Next, when a position of a countershaft 12 to both input and output shafts 11 and 13 is determined, the holding body 25 is locked to a stand- leged stool 26, successively tension of a constant-speed belt 19 is adjusted by a tension indication adjusting device 50. In addition, an adjusting device in a pilot controller 35 is moved to some extent, and an interval between the lockup of a speed change pulley 21 and slide pulleys 21a and 21b is controlled, thus rotational adjustment for the speed change belt 18 takes place. Doing like this, accuracy in output frequency is promotable and, what is more, such power transmission that is stable in rotation with no slip is performable.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a belt stretching method for preventing rotational speed disturbance and slippage in response to belt stretching that occurs with the operation of a two-stage power transmission device. Relating to a regulating device.

[Prior art]

In a conventional two-stage belt power transmission device, when the belts in the upper and lower stages are stretched, the amount of stretch of the belts is different between the upper and lower stages because the belt tension during operation is different between the upper and lower stages. Countermeasures to compensate for this belt elongation have been considered. One of them is Japanese Utility Model Publication No. 56-44925.

In this method, the axes of the input, output, and intermediate shafts are located at each vertex of a triangle, and the intermediate shaft is held in a floating state so that the distance between the two sides of the triangle can be changed. be.

〔problem〕

This method can be applied when both the first stage and the next stage of a two-stage transmission device are constant speed ratio belt reducers, but the first stage is a variable diameter belt transmission and the next stage is a constant speed ratio belt reducer. When combining machines, it cannot be applied for principle reasons. In other words, in a constant speed ratio belt m-speed machine,
Belt elongation can be solved by changing the distance between the rotating shafts, but in a variable diameter belt transmission, changing the distance between the shafts causes a change in the output rotation speed.

Therefore, in a two-stage power transmission device that combines a belt transmission and a belt speed reducer, the conventional method cannot be adopted as a countermeasure against belt elongation. In particular, with the conventional method, the intermediate shaft is supported in a floating state, resulting in the distance between the shafts being constantly in a floating state, and the output rotation speed also fluctuates as the intermediate shaft floats. There were problems that made it completely unsuitable for two-stage power transmission systems including machines.

〔the purpose〕

This invention is a two-stage power transmission device that has a belt transmission in the first stage and a belt reducer in the second stage, which ensures accurate rotational speed with respect to the extension of the belts in each stage, and is stable without slipping. It is an object of the present invention to provide a belt extension adjustment device capable of transmitting power according to the invention.

[Technical means for solving the problem] According to the present invention, in a two-stage power transmission device, a tension indicating adjustment device is provided for the elongation of the deceleration belt of the next stage belt reducer, and the belt of the first stage is A pilot control device is provided for the extension of the speed change belt of the transmission, and a take-up device is also installed, which is a common adjustment function for the belt transmission and the speed reducer.

Furthermore, among the three means for belt stretching mentioned above, namely the tick-up device, the tension indication adjustment device, and the pilot control device, the tension indication adjustment device and the pilot control device perform the adjustment work individually. It is attached so that the part to be used protrudes outside the housing.

[For production]

As a result, when there is a large stretch of the belt or when the belt is replaced, first the positioning of the intermediate shaft relative to the input/output shaft is determined by the tick-up device as an adjustment function common to the upper and lower transmitters, and then the stretch of the deceleration belt is adjusted. It is adjusted with priority over the speed change belt. In other words, a tension indicating adjustment device is applied to the speed reduction belt of the belt speed reducer installed in the next stage to deal with elongation, and a pilot control device is used to deal with elongation of the speed change belt of the belt transmission. It is. Therefore, the belt transmission and the belt speed reducer each deal with belt elongation separately, and the accuracy of the output rotation speed can be easily adjusted while maintaining the belt tension appropriately.

Furthermore, since the above-mentioned pick-up device is disposed inside the housing chamber, and the pilot control device and tension indicating adjustment device are disposed protruding outside the housing chamber, parts that need to be constantly adjusted for belt elongation are covered with a maintenance cover. It has the advantage of being easy to operate from outside without having to open it.

〔Example〕

In FIG. 1, among the two stages of upper and lower belt transmissions, a variable diameter belt transmission B is built in the upper stage, that is, the first stage side, and a constant speed ratio belt reducer C is built in the lower stage, that is, the next stage side, respectively, in a sealed housing 10. 1 is a vertical cross-sectional view of a two-stage power transmission device. -#≠K In the figure, 11 is an input rotating shaft to which a power source such as an induction motor is directly connected, 12 is an intermediate rotating shaft, and 13 is an output rotating shaft to which a load such as a blower fan is attached. Variable diameter pulleys 21 and 22 and constant speed ratio boots IJ23 and 24 are arranged on each rotating shaft 11, 12 and 13, and belts 18 and 19 constitute a two-stage belt transmission. and lid body 1
It is housed in a closed housing chamber 20 formed by 5 and 5. The variable diameter pulleys 21 and 22 are fixed pulleys 21a and 22a and sliding pulley 21b, respectively.
and 22b. The intermediate shaft 12 is supported by a holder 25. On the other hand, fixed arms 29a, 29b and 29c extending in three directions protrude from the holder 25, each having an elongated hole, and the protruding bottom of the frame 14. Each of the three standing stands 26a, 26b, and 26c standing upright from 14C is fixed with bolts or nuts, and is not in a floating state as in the conventional case, but is firmly fixed. 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 cooling device 30 is provided on the inner wall of one side wall portion 14a of the box-shaped frame 14 and protrudes outside the frame, and a blower device, that is, a sirocco cooling blower 31 is attached thereto. It is being Although a centrifugal blower device is shown here, an axial blower device may be used as long as high static pressure can be maintained in the room 20.

The rotating shaft 32 of this 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 above-mentioned driving side fixed boo 'J21a. Approximately 3,000 r, p due to the power of shaft 11
, m or more.

On the other hand, a pilot control section 35 for controlling the drive side variable pulley is installed on the other side wall section 14b of the box-shaped frame body 14,
A reversible motor 36 with built-in gear reduction is mounted on the mounting base 3.
7, and its motor output is transmitted via a transmission 38,
It is connected to a connecting means 39 assembled to the variable pulley 21. This reversible motor 36 performs speed change control. That is, the pilot control section 35 has a function of exchanging an electrical signal into a mechanical signal, and an output signal from a well-known electronic regulator (not shown) is connected here. An adjustment lid 35a is provided on the front surface of the pilot control unit 35, and is equipped with known means for electrically adjusting the operating range of the reversible pull motor 39 by opening the adjustment lid 35a. Therefore, this allows fine adjustment of the rotation speed of the belt transmission.

Furthermore, the column 5 stands upright from the elliptical protruding bottom portion 14c.
2 is provided with a support arm 53 of a tension pulley 54,
A spring or coil spring 55 provided coaxially with the tension indicating shaft 56 presses the support arm 53, thereby pressing the pulley 54 against the back of the second stage belt 19. As will be described later, the pressing force by the coil spring 57 is adjusted by rotating the screw 57 from the outdoor side of the housing, and together with the tension indicating shaft 56 constitutes a tension indicating adjustment device 50.

Next, the driven side variable pulley 22 is placed at the upper end, and the small diameter boob I
J 24 is attached to the lower end, and a holder 25 is pre-assembled integrally at the center of the intermediate shaft 12, which is attached to the intermediate shaft 12.
This integral assembly A can be removed through a 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 J3 and the intermediate shaft 12 when this assembly A is installed, the housing 10 is
A tick-up mechanism is provided at the end of the protruding bottom portion 14c, and an adjustment column 60 and bolt 61 that are raised from the housing 10 are provided.
The bolt 61 can be screwed into a screw 62 provided on the back surface of the support body 25 to perform manual pick-up.

FIG. 3 shows a partially cutaway perspective view of the lower stage health I tension indicating and adjusting device 50 shown in FIG. A support column 52 is fixed upright to the bottom flange portion 14h of the frame body 14, and there,
A support arm 53 having a support portion 53a and an arm portion 53'b formed in an L-shape is supported. A retaining portion 53c extends from the arm portion 53b, and is pivotally engaged with one end of the tension indicating shaft 56. A coil spring 55 is installed between a locking plate 58 that is adjacent to the pivot portion of the instruction shaft 56 and is assembled integrally with the instruction shaft 56, and one end of an adjustment nipple 57 that is integrally formed with a bolt portion 57a. .

The bolt portion 57a of the adjustment nipple 57 is exposed from the tip of the protruding adjustment portion 14g of the frame body 14, so that the tension can be adjusted from the outside of the frame body, and a Taber through hole is provided inside the adjustment nipple 57. Then, the other end of the indicator shaft 56 is further exposed from the bolt portion 57a, and the indicator shaft 56 is further exposed from the bolt portion 57a.
The belt tension can be visually checked by the positional relationship between the nipple 57 and the scale provided on the side circumferential surface of the belt 6.

In such a configuration, the driven pulley 22 and the driving pulley 2
4 and the holder 25 can be attached or detached from within the frame 14 by simply removing a nut during maintenance. However, when newly installing the belt or correcting the elongation of the belt, the upper and lower belts 18 and 19
It is necessary to balance each tension of the
In the present invention, the elongation of the upper and lower belts 18 and 19 is first dealt with by the above-mentioned tick-up device. When the position of the intermediate shaft 12 with respect to the output shafts 11 and 13 is determined by this, the intermediate shaft holder 25 is fixed to the stand, the adjustment cover 35a of the device 35 is opened to the belt, and the speed change is performed here. This is done by moving the adjustment means in the pilot control device 35 that controls the distance between the fixed pulley 21a and the sliding pulley 21b of the pulley 21.

Moreover, once the distance between the input/output shafts 11.13 and the intermediate shaft 12 is determined, the maintenance cover 15 is sealed, but the belt 18.19 is prevented from elongating due to long-term operation. is a pilot control device 35 and a tension instruction adjustment device 50.
Since only the adjustment part is installed on the wall of the sealed housing 14 and protrudes outside, the maintenance cover can be easily adjusted without opening the maintenance cover.
Adjustments can be made quickly.

〔Effect of the invention〕

According to the belt extension adjustment device of the present invention, even in a composite two-stage power transmission device including a belt transmission and a belt reduction gear, a tension indicating adjustment device and a pilot control device are used as individual adjustment devices for the elongation of both belts. Since the control device is equipped with a tick-up device for the intermediate shaft as an adjustment device common to both, even if the elongation of the belt is different between the upper and lower stages, the output rotation speed can be made accurate. Both stable power transmission without slipping can be achieved.

Further, there is also the advantage that the input and output axes can be configured coaxially, without requiring that the human power and output 1 intermediate axes be located at the vertices of a diagonal, as in the conventional case. Furthermore, since both the tension indicator adjustment device and pilot control device adjustment parts for adjusting each belt individually can be operated outdoors, there is no need to open the maintenance cover, making work more efficient, and This is also advantageous when installing the transmission device in a dangerous location such as a blower.

FIG. 2 shows a cross-sectional view of the power transmission machine taken along line nn in FIG.
...Housing, 11.12 and 13...Human power axis,
Intermediate shaft and output shaft, 14... Frame body, 35... Control device, 50... Tension instruction adjustment device, 60... Tick-up device, A... Intermediate shaft assembly, B... 1st stage transmission section, C... 2nd stage transmission section.

Patent applicant: Tokyo Jidokiko Co., Ltd. Figure 1 Figure 3 μ

Claims (2)

[Claims] (1) A belt transmission is installed between the input shaft and the intermediate shaft, and a belt reducer is installed between the intermediate shaft and the output shaft, and the input and output shafts are housed in a single housing so as to be coaxial, and the input and output shafts are housed in a single housing. a take-up device provided in the housing for moving the holder of the intermediate shaft in the interaxial direction between the shaft and the intermediate shaft; and a tension force having a spring adjustment means for pressurizing a tension pulley to the reduction belt of the belt reduction gear. A two-stage power transmission device comprising an indicating adjustment device and a pilot control device having an adjustable speed range and having a reversible electric motor for converting an electrical signal into a mechanical signal for controlling the speed ratio of the belt transmission. Belt extension adjustment device. (2) The take-up device is arranged in the interior of the housing, and the spring adjustment means for adjusting the tension indication and the speed change range adjustment section of the pilot control device are both arranged so as to be exposed outside the housing. A belt extension adjustment device for a two-stage power transmission device according to claim 1.