JPH04108577A - Device for driving rotary shifter - Google Patents

Abstract

PURPOSE:To fully prevent the axial run-out of a driving shaft and drive the driving shaft without vibrating a rotary shifter by positioning the center of gravity of a counterweight as high as the vertical center of a radial bearing. CONSTITUTION:A driving shaft 1 consists of a crank shaft 7 passing through a shaft housing 5 fixed to a base support 3 and freely rotatably supported thereby and a crank pin 9 provided eccentrically on the upper part of the crank shaft 7. A supporting plate 11 is provided at the upper part of the crank shaft 7 extending in the direction opposite from the eccentric direction of the crank pin 9 and a counterweight 13 is fixed to the end of the supporting plate 11. An electric motor 15 being a driving source is fixed to the base support 3 and connected to the crank shaft 7 through a belt wheel 17 and a belt 18 mounted on the lower part of the crank shaft 7 so as to rotate the crank shaft 7. The vertical center 27 of a radial bearing 25 is positioned as high as the center of gravity 29 of the counterweight 13.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a drive device used in a rotary shifter that performs sieving through rotational motion.

(Prior art) A rotary sifter that performs sieving through rotational motion has a sieve body mounted and fixed on an underframe that is supported by corner supports so that it can rotate horizontally, and this underframe is rotated by a drive device. A configuration is used that allows

The drive device has a drive shaft formed from a crankshaft and a crankpin, and an underframe is rotatably attached to the crankpin via a radial bearing. therefore,
When the crankshaft of the drive shaft is rotated by a drive source, the underframe and the sieve body fixed on the underframe are rotated in the horizontal direction according to the circular motion of the crank pin, and sieving is performed within the sieve body. Become. A balance weight is fixed to the drive shaft so that the center of gravity is located in a direction opposite to the eccentric direction of the crank pin.

(Problem to be solved by the invention) The balance weight causes axial vibration on the drive shaft due to the horizontal force acting on the crank pin from the radial bearing during the rotational operation of the rotary shifter.
The weight of the harness weight and the eccentric distance from the center of gravity of the balance weight from the crankshaft should be set appropriately, that is, the centrifugal force acting on the balance weight should be considered. It is not possible to keep the axial runout of the drive shaft within the permissible range by only using this method.

Therefore, it is an object of the present invention to provide a drive device that can sufficiently prevent shaft runout of a drive shaft and drive a rotary shifter without causing vibration.

(Means for Solving the Problems) In order to achieve this object, the present invention provides a drive shaft formed of a crankshaft and a crankpin, and a drive shaft such that the center of gravity is located in a direction opposite to the eccentric direction of the crankpin. It consists of a balance weight fixed to a drive shaft and a drive source that rotates the crankshaft, and an underframe supported by a corner support so as to be horizontally rotatable is attached to the crank pin via a radial bearing. In the drive device for a rotary shifter rotatably attached to the rotary shifter, the center of gravity of the harness weight is located at the same height as the vertical center of the radial bearing.

(Function) Since the center of gravity of the balance weight is located at the same height as the vertical center of the radial bearing, the centrifugal force acting on the balance weight and the radial bearing acting on the crank pin during rotation of the rotary shifter are The force in the horizontal direction is on the same straight line.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a rotary shifter using a drive device according to the present invention.

The drive shaft 1 is formed of a crank shaft 7 that is rotatably supported through a circumferential housing sink 5 fixed to a base 3, and a crank pin 9 eccentrically provided at the upper end of the crank shaft 7. has been done.

A support plate 11 is provided at the upper end of the crankshaft 7 and extends in a direction opposite to the eccentric direction of the crank pin 9, and a harness weight 13 is fixed to the tip of the support plate 11. An electric motor 15 serving as a driving source is fixed to the base 3 and connected via a belt 18 to a belt pulley 17 attached to the lower end of the crankshaft 7 to rotate the crankshaft 7.

The square underframe 19 is supported at its four corners by corner supports 21 fixed to the base 3 so that it can rotate in the horizontal direction. A pin housing 23 is fixed to the center of the underframe 19, and the crank pin 9 is rotatably passed through the pin housing 23 via a radial bearing 25 (see FIG. 2).

The vertical center 27 of the radial bearing 2'5 (see FIG. 2) and the center of gravity 29 of the harness weight 13 (see FIG. 2) are located at the same height.

The sieve body 31 is stacked on the underframe 19, and the presser member 3
3 and is fixed on the underframe 19 by being pressed down from above. The lower end or the upper end of a clamping rod 35 attached to the underframe 19 is passed through the presser member 33, and a clamping member 37 is fitted onto the upper end of the clamping rod 35. In other words, when the member 37 is tightened, the presser member 33
is configured to press down the sieve body 31.

In addition, in the figure, 39 is a fixing member for fixing the circumferential housing 5 to the base 3, and 41 is a fixing member fixed to the four corners of the underframe 19.
The holding member 43 of the sieve body 31 is a supply port for the object to be sieved.

FIG. 2 is a sectional view of a portion of the drive shaft.

A pin housing 23 fixed to the center of the underframe 19 and a crank pin 9 passed through the pin housing 23.
A radial bearing 25 is arranged between the radial bearing 25 and the vertical center 27 of the radial bearing 25, which is located at the same height as the center of gravity 29 of the Haranth weight 13 fixed to the tip of the support plate 11. are doing.

A circumferential housing 5 fixed to the base 3 via a fixing member 39, and a crankshaft 7 passed through the circumferential housing 5.
A circumferential radial bearing 45°45 is disposed between the crankshaft 7 and the crankshaft 7, and the crankshaft 7 is rotatably supported by the circumferential housing 5.

Note that 47 and 49 in the figure are thrust bearings, respectively.

FIG. 3 is a sectional view of the corner support 21.

A driven crankshaft 55 is supported on the support body 51 fixed to the base 3 via driven shaft radial bearings 53,53. A driven crank pin 57 is provided at the upper end of the driven crankshaft 55.
7 is eccentric by the same distance as the eccentric distance of the crank pin 9 of the drive shaft 1 (see FIG. 2). Driven crank pin 57
A driven pin housing 61 is rotatably fitted in the driven pin housing 61 via a driven radial bearing 59, and a corner of the underframe 19 is fixed to the upper surface of the driven pin housing 61. Therefore, when the drive shaft 1 is rotated by the electric motor 15 (see Fig. 1), the driven crankshaft 55 and the driven crank pin 57 are driven to rotate, and the underframe 19 is rotated in the horizontal direction. .

In addition, 63 in the figure is a buffer member for horizontal loads;
5.67 are thrust bearings.

FIG. 4 is a side sectional view of the rotary shifter.

The tightening member 37 is tightened by a nut 69 fitted into the collar portion formed at the upper end of the stopper 35, and a spring member 71 disposed between the nut 69 and the holding member 33.
Spring receivers 73 and 73 are arranged at both ends of the spring member 71. The spring member 71 has a structure in which two springs with different winding directions are arranged inside and outside so that the tightening force of the member 37 does not loosen easily. For tightening, the lower end of the rod 35 has a retaining portion 75, and is attached to the underframe 19 by fitting into a support member 77 fixed to the underframe 19.

A separation prevention structure is adopted in the stacked portion of the sieve body 31. This anti-slip structure is composed of a felt 79 bonded to the lower edge surface of the upper sieve body 31 and a rough sand cloth 81 bonded to the upper edge surface of the lower sieve body 31. The frictional force acting between the felt 79 and the sand cloth 81 can prevent the stacked sieve bodies 31 from slipping during the rotation operation of the rotary shifter.

(Effects of the Invention) As explained above, the rotary shifter drive device of the present invention has the advantage that the centrifugal force acting on the balance weight and the horizontal force acting on the crank pin from the radial bearing are not on the same straight line. Since no axial runout of the drive shaft occurs, the rotary shifter can be driven while effectively suppressing vibration. FIG. 1 is a front view of a rotary shifter using the drive device according to the present invention, and FIG. FIG. 3 is a sectional view of the drive shaft portion, FIG. 3 is a sectional view of the corner support, and FIG. 4 is a sectional view of the side part of the rotary shifter.

1 II φ 7・・・ 9　・・ 13・・ 15　・・ 19　・・ 21　・・ 25　・・ 27・・ 29　・・ ・Drive shaft ・Crankshaft ・Crank pin ・Balance weight ・Electric motor ・Underframe ・Corner support number radial bearing ・Vertical center of radial bearing ・Center of gravity of balance weight

Claims (1)

[Claims] (1) A drive shaft formed from a crankshaft and a crank pin, a balance weight fixed to the drive shaft so that the center of gravity is located in a direction opposite to the eccentric direction of the crankpin, and a drive for rotating the crankshaft. and a drive unit for a rotary shifter, in which an underframe is rotatably attached to the crank pin via a radial bearing and is rotatably supported by a corner support in a horizontal direction. A drive device for a rotary shifter, wherein the center of gravity of the weight is located at the same height as the vertical center of the radial bearing.