JPS642021B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Vibratory feeding or conveying devices have been used in industry for many years. A basic form of a vibratory feeder is shown in US Pat. No. 3,089,582. In the device of that patent, a two-mass excitation system is used as a means of imparting an oscillatory motion to the material transport member or trough. The vibration generating device consists of a constant speed motor with eccentric weights attached to both ends of the motor shaft, and the vibration force generated by the operation of the motor is transmitted to the material through a spring system. transmitted to the conveying trough. The amplitude is constant, so a constant feeding operation takes place.

In the improved variable vibration feeding device described in U.S. Pat. No. 3,358,815, a wheel-like member is carried on each end of the output shaft of an electric motor, and the wheel-like members rotate together with the shaft. . Each wheel-like member is associated with a weight that can be displaced along an arcuate path from a first position near the fixed eccentric weight to a second position opposite the fixed weight. It is said that the weight is preferably made of a fluid such as mercury, which can be easily displaced by changing the pressure. However, because mercury can be a source of contamination, mercury-type variable vibrating dispensers have not gained widespread acceptance.

According to the present invention, the above-mentioned applicant's U.S. Patent No.
Although similar to the one described in No. 3358815,
A movable weight of metal may be used and the weight may be moved along a straight path extending radially from the axis of rotation of the wheel-like member rather than along a curved path around the axis of rotation of the wheel-like member. A device is provided that differs from that of the above patent in that it has the following features:

Furthermore, in the present invention, a coil spring is used to move the movable weight from a first position on the same side of the rotational axis of the wheel-like member as the fixed eccentric weight to a second position on the opposite side of the rotational axis. move it. The coil spring first operates in compression to move the movable weight beyond the axis of rotation, and then operates in tension to resist but prevent outward movement of the movable weight due to centrifugal force. I don't. The movable weight has a piston that is controlled by fluid pressure, and the ratio between the fluid pressure and the amount of movement of the movable weight is linear thanks to the action of the spring described above, so the control is easy. greatly facilitate and simplify.

Referring to FIG. 1, the above U.S. Pat.
A vibratory feeding device 10 similar to that shown in the above is shown. The supply device 10 includes a base 14;
It comprises an isolation spring 12 supported on legs 13 upright from a base and a material conveying member in the form of a trough 11 mounted on the isolation spring. The vibration generator has excitation means 15 including a constant speed electric motor 16 . The motor 16 is connected to a frame member 17 fixed to the trough 11 via a rubber shear spring 18 as shown in commonly assigned US Pat. Nos. 3,089,582 and 3,358,815. The motor 16 is thus connected to the frame member 17 via the spring system and operates at a constant speed close to the natural frequency of the spring system.

The motor 16 has a motor shaft 20, and one wheel-shaped member 21 of the same structure is fixed to each end of the motor shaft so as to rotate together with the motor shaft. Only one wheel-like member is shown in the figure. An eccentric fixed weight 22 is fixed to each wheel-shaped member 21 on one side of the axis of rotation of the shaft 20 . Each wheel-like member also has a shaft 2
A cylinder 23 extending on both sides of the cylinder 0 in the radial direction is fixed. One end 24 of the cylinder 23 is located near the center of gravity of the fixed weight 22, and the other end 25 is located on the opposite side of the axis of rotation of the shaft 20 from the side where the weight 22 is located. The end 24 of the cylinder is closed by a cap 26, and a coil spring 27 is disposed within the cylinder to secure one end thereof to the cap 26. cylinder 2
A piston 29 is further slidably mounted inside 3,
A weight 2 is attached to the piston 29 so as to move therewith.
Fix 8. The piston 29 and the weight 28 cooperate to form a movable weight that moves within the cylinder 23.

The other end 25 of the cylinder 23 is closed by a cap 30, forming a pressure chamber 31 between the cap 30 and the piston 29. The other end of the spring 27 is fixed to the piston 29. One end of the pressure fluid conduit 32 is connected to the pressure chamber 31 and the other end is connected to a rotatable connector 33 (FIG. 1) attached to the shaft 20.
One end of fluid pressure conduit 34 is connected to this connector, and the other end is connected to a source of pressure fluid, such as compressed air.

When at rest, the movable weights 28, 29 and the second
Part 3 of the spring 27 on the right side of the axis of rotation as seen in the diagram
6 plus the center of gravity 35 is at the position shown in FIG. After starting, when the motor reaches its normal operating speed, piston 29 and weight 28 move outward from the axis of rotation to the position shown in FIG. The spring 27 is stretched by rotation and resists the centrifugal force acting on the piston and the weight 28. In the position shown in FIG. 3, the vibration force created by the portion of the fixed weight 22 and spring 27 on the left side of the axis of rotation as seen in FIG. Equal to and opposite the vibrational force created by the more right-hand spring portion 36. Therefore, by the excitation means, the trough 1
No vibration force is applied to 1. However, through conduit 34, connector 33, and conduit 32, pressure chamber 3
1 causes the piston and weight 28 to move to the left as viewed in FIG. The spring 27, which is initially in the tensioned state, then supports the leftward force exerted by the fluid pressure, which force causes the piston and the weight 28 to move radially toward the axis of rotation. It decreases as it moves inward (and thus as the centrifugal force due to the piston and weight decreases). As the piston and weight move further to the left beyond the position shown in FIG. Resist further movement.

In this way, the centrifugal force exerted by the movable weight and piston is maximized as shown in FIG.
The spring in this extended state assists the pressurized fluid in moving the weight and piston to the left when sufficient to move them to the position shown. The assisting force of the spring decreases to zero when the piston and weight reach the position of FIG. 2, and as the piston and weight move further to the left from the position of FIG. The leftward movement towards is assisted by centrifugal force), the spring 27 is compressed and opposes the fluid pressure.

The use of this coil spring is advantageous because the deflection of the coil spring in both the extension and compression directions is proportional to the applied force, that is, in a linear relationship.
This is particularly advantageous in that it allows precise and easy control of the vibrational forces to be created.

[Brief explanation of drawings]

Fig. 1 is an elevational view of a vibrating feeder incorporating the present invention, Fig. 2 is an enlarged cross-sectional view of a wheel-shaped member fixed to a motor shaft, and Fig. 3 is a partial view of Fig. 2, and is movable. The weight is shown moved to a different position. 11: Trough (material conveyance member), 20: Motor shaft, 21: Wheel-shaped member, 22: Fixed weight, 2
3: Cylinder, 27: Coil spring, 26, 30:
Cap, 31: Pressure chamber, 32: Conduit.

Claims (1)

[Scope of Claims] 1. A device for changing the vibration force created by a rotating mass body, comprising: a rotatably attached shaft; a rotation means for rotating the shaft; a first fixed weight that is fixed and has a center of gravity offset from the axis of rotation of the shaft; a cylinder having a longitudinal axis passing through the center of gravity of the fixed weight and extending perpendicularly to the rotational axis of the shaft; a second movable weight mounted in the cylinder so as to be movable in the axial direction; The second
a spring urging the movable weight toward a position on one side of the axis of rotation of the shaft; and a fluid pressure acting to move the second movable weight toward a position on the other side of the axis of rotation of the shaft. A vibratory force modification device comprising a responsive means and means for connecting the hydraulic responsive means to a source of pressure fluid. 2. A device for changing the vibrational force created by a rotating mass, comprising a rotatably mounted shaft, a rotation means for rotating the shaft, and a wheel carried by the shaft. a first fixed weight attached to the wheel-shaped member at a fixed position on one side of the rotation axis of the shaft; and a first fixed weight attached to the wheel-shaped member, one end of which is attached to the first fixed weight. a cylinder extending in the radial direction of the wheel-like member such that the other end is positioned close to the center of gravity of the shaft and the other end is located on the other side of the axis of rotation of the shaft; and a cylinder that is mounted movably in the axial direction within the cylinder. a second movable weight disposed within the cylinder, the second movable weight being directed to a position on the other side of the axis of rotation of the shaft opposite to the side on which the first fixed weight is located; a spring for urging the second movable weight toward the one side of the axis of rotation; and means for connecting the fluid pressure responsive means to a source of pressure fluid. Vibration force changing device consisting of. 3. A device for changing the vibrational force created by a rotating mass, comprising: a rotatably mounted shaft; a rotation means for rotating the shaft; and a wheel carried by the shaft. a first fixed weight attached to the wheel-shaped member at a fixed position on one side of the rotation axis of the shaft; and a first fixed weight attached to the wheel-shaped member, one end of which is attached to the first fixed weight. a cylinder extending in the radial direction of the wheel-like member such that the other end is positioned close to the center of gravity of the shaft and the other end is located on the other side of the axis of rotation of the shaft; and a cylinder that is mounted movably in the axial direction within the cylinder. a second movable weight disposed within the cylinder, one end being fixed to the one end of the cylinder and the other end being fixed to the second movable weight, the shaft being stationary; when the second movable weight is on the other side of the axis of rotation of the shaft opposite to the side where the first fixed weight is located, the second movable weight is pressed toward the other end of the cylinder. , does not prevent movement of the second movable weight toward the one end of the cylinder when the shaft is rotating;
a coil spring that elastically resists said movement and is fixed to a second movable weight within said cylinder to move the second movable weight toward the first fixed weight in response to fluid pressure; A vibratory force modifying device comprising a piston operative to cause the piston to move, a source of pressure fluid, and means for connecting the source of pressure fluid to the piston for moving the piston toward a first fixed weight. 4. A device for modifying the vibrational force created by a rotating mass, comprising a rotatably mounted shaft, a rotation means for rotating the shaft, and a wheel carried by the shaft. a first fixed weight attached to the wheel-shaped member at a fixed position on one side of the rotation axis of the shaft; and a first fixed weight attached to the wheel-shaped member, one end of which is attached to the first fixed weight. a cylinder extending in the radial direction of the wheel-like member such that the other end is positioned close to the center of gravity of the shaft and the other end is located on the other side of the axis of rotation of the shaft; and a cylinder that is mounted movably in the axial direction within the cylinder. a second movable weight disposed within the cylinder, one end being fixed to the one end of the cylinder and the other end being fixed to the second movable weight, the shaft being stationary; when the second movable weight is on the other side of the axis of rotation of the shaft opposite to the side where the first fixed weight is located, the second movable weight is pressed toward the other end of the cylinder. a coil spring fixed to the second fixed movable weight within the cylinder, the shaft not preventing movement of the second movable weight toward the one end of the cylinder, but elastically resisting the movement; a piston disposed in the cylinder; means provided at the other end of the cylinder for cooperating with the piston to define a pressure fluid chamber; a source of pressure fluid; means for connecting the source of pressure fluid to the pressure fluid chamber for moving the pressure fluid by the second movable weight, when the second movable weight is located proximate the other end of the cylinder and a portion of the spring on the other side of the axis of rotation of the shaft.
A vibratory force modification device adapted to substantially balance the vibratory force created by a fixed weight and a portion of the spring between the axis of rotation of the shaft and one end of the cylinder.