JPH05161305A - Variable vibration force device for dual vibration generator - Google Patents

Abstract

PURPOSE:To provide a device for selectively obtaining a lateral or longitudinal vibration by converting both rotating and stopping drive shafts into arbitrary phase difference irrespective of rotation and stop of the shaft by an external one-touch operation to simply and rapidly vary an exciting force generated by a vibration generator and laterally or longitudinally combining first and second vibrating means. CONSTITUTION:First vibrating means (b) having first and second eccentric weights 11, 12 and second vibrating means having third and fourth eccentric weights 20, 21 are provided in parallel. Telescopix means 22 for converting phase differences of the first, second and third, fourth weights 11, 12, 20, 21 is connected to a second shaft 6 of the means (b), and further first and second interlocking means 12, 14 rotating synchronously with the means (b) and second vibrating means (c) are connected thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration force varying device for a dual vibration generator used in the transportation, supply, and filling industries of articles.

[0002]

2. Description of the Related Art Conventionally, vibrations of a predetermined amplitude have been continuously generated by rotation of an eccentric weight attached to a rotary shaft of a motor, which is attached to a hopper, chute, conveyor, etc. for the purpose of conveying articles or eliminating clogging. A vibration generator for generating the vibration is used.

As shown in FIG. 7 and FIG. 8, this type has an output shaft 51 of the motor 50 on one side or both sides of the motor 50.
The fixed weight 52 that is eccentric to the output shaft 51 is fixed, and the adjustment weight 53 that is eccentric to the output shaft 51 is freely rotatable by tightening the tightening bolt 54. The weights 52 and 53 are covered with a cover 55.

Then, the tightening bolt 54 is loosened and the adjusting weight 53 is rotated each time according to the working condition of the work piece, and the vibration force (exciting force) is desired within the range from the maximum to zero. After adjusting the amount to be adjusted, the tightening bolts 54 are fixed to the output shaft 51.

In the conventional device described above, when the vibration force (exciting force) is converted, the rotation of the motor is once stopped, the cover of the motor is removed, and then the tightening bolt is loosened to perform the adjustment. Since it is necessary to rotate the weights and set an appropriate phase difference between the pair of weights to adjust to the desired amount of vibration, the worker must go to the work site and perform the work manually each time. The main processing is temporarily interrupted by the adjusting operation, and the work efficiency is remarkably reduced because the attachment and detachment of the cover and the tightening of the tightening bolts are troublesome.

This device cannot convert the vibration force (excitation force) from the outside at the time of rotation of the motor, and because of its large amplitude amount at the time of low speed rotation at the time of starting and stopping the motor, Abnormal vibration of, for example, a table or a hopper to which this device is attached adversely affects the main processing and the operation.

Since most of the vibrations by this device are performed in the rotational direction of the adjusting weight, it is necessary to arrange these devices side by side to take out the vibrations only in the vertical direction or the front-back direction. However, when these devices are installed side by side, the driving is performed by two motors, but a waviness of vibration occurs due to the different rotation speeds of the two motors, and uniform and desired vibration is generated. I can't get it. There were various problems such as.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems. The second eccentric weight for adjustment is made movable by advancing and retracting the second shaft, and the second shaft is advanced and retracted. By means of one-touch operation from the outside by means of both the rotating and stopping of the drive shaft of the first axis, both can be converted to an arbitrary phase difference, and the vibration force (exciting force) generated by the machine can be easily and quickly And a device capable of selectively obtaining horizontal vibration and vertical vibration by arranging the first vibration unit and the second vibration unit in a vertical direction or a horizontal direction. The purpose is to do.

[0009]

Means for Solving the Problems The means of the present invention for achieving the above-mentioned object is to provide a first shaft rotatably supported in a housing box and a first shaft coaxially with the first shaft. A second shaft, which is slidably connected and rotates in synchronization with the first shaft, is screwed into a screw portion provided around the second shaft, and is rotatably supported by the storage box and is axially moved. A first oscillating means including a first eccentric weight fixed to the first shaft and a second eccentric weight fixed to the female screw cylinder of the second shaft; A third shaft arranged in parallel at a predetermined interval in parallel with the third shaft, a fourth shaft arranged in parallel with the second shaft on a coaxial line with the third shaft, and a third eccentric weight fixed to the third shaft. Second vibrating means consisting of a fourth eccentric weight fixed to the fourth shaft, first interlocking means for rotating the first shaft and the third shaft in synchronization, Dual vibration generation including second interlocking means for synchronously rotating the two axes and the fourth axis, rotation means associated with the first axis, and advancing / retreating means associated with the second axis It is in the configuration of the machine vibration force varying device.

[0010]

The present invention has the following functions due to the above-mentioned structure. The first eccentric weight and the second eccentric weight, which are the first vibrating means, are set in advance according to the working conditions of the workpiece.
And, it adjusts the phase difference between the third eccentric weight and the fourth eccentric weight, which are the second vibrating means, and the first and second eccentric weights, and the third eccentric weight and the fourth eccentric weight overlap. In the state where the phase difference is 0, for example, when it is desired to obtain 50% of the vibration force, the advancing / retreating means is operated to move the second axis in the axial direction by half of the movement stroke of the second axis. Since the screw cylinder is restricted from moving in the axial direction because it is screwed into the screw part, it rotates 90 ° along the lead of the screw and the second eccentric weight attached to this female screw cylinder rotates. At the same time, each shaft is synchronously rotated by the second interlocking means attached to the second and fourth shafts, and the first eccentric weight of the first shaft and the second eccentric weight of the second shaft are A 90 ° phase difference is formed between the third eccentric weight of the three axes and the fourth eccentric weight of the fourth axis.

In this state, when the rotating means rotates the first shaft, the second shaft connected to the first shaft also rotates in synchronization with the first shaft, and the first and second interlocking devices rotate. The third and fourth axes are also rotated synchronously, and the first vibrating means and the second vibrating means are operated.

The phase difference between the first eccentric weight and the second eccentric weight and between the third eccentric weight and the fourth eccentric weight is adjusted by rotating the first shaft and the second shaft by the rotating means. That is, the first and second vibrating means may be rotated.

The first eccentric weight, the second eccentric weight, the third eccentric weight, and the fourth eccentric weight, which are fixed to the first and second shafts with a phase difference, rotate to generate a vibration force of 50%. Is generated from the device.

When the vibration force is stopped, when the machining operation is completed, the advancing / retreating means is operated during the normal rotation of the first and second shafts and the third and fourth shafts to move the second shaft. When the other half of the moving stroke is further moved in the axial direction, the screw cylinder is rotated by 90 ° along the lead of the screw for screwing with the screw portion of the second shaft, and the second shaft is rotated. The second eccentric weight moves the phase difference with the first eccentric weight.
180 °, that is, both move to the position where they oppose each other, and the fourth eccentric weight also moves in the same manner by the second interlocking means, and as a result, the respective vibrating forces cancel each other out and the vibrating force becomes 0%. No vibration is transmitted to the work piece.

At this time, if the drive of the rotating means is shut off, the apparatus is kept in a quiet state until the first and second shafts and the third and fourth shafts are stopped.

By the arrangement of the above-mentioned first and second vibrating means in the vertical or horizontal direction, for example, in the case of the vertical arrangement shown in FIG. 3, a vibrating force mainly in the lateral direction can be obtained, and FIG. In the case of the horizontal arrangement shown in (1), a vertical excitation force is obtained.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a vibration force varying device for a dual vibration generator according to the present invention will be described with reference to the drawings.

The vibration generator A can be widely used in, for example, a vibration conveyor for packing foundry sand, a vibrating conveyer, a feeder or hopper for transferring powder or granules, a concrete molding device, and the like.

In FIGS. 1 to 4, reference numeral 1 denotes a housing box of the vibration generator A, which is formed in a rectangular shape and accommodates a first vibrating means a and a second vibrating means c which will be described later.

Then, the first vibrating means b is the storage box 1
By the bearings 2 and 3 provided on one side wall and the intermediate wall inside the
A hollow first shaft 4 is supported, and a rotating means 5 such as a motor is linked to the first shaft 4 on the one side wall so as to rotate at a predetermined speed.

Further, the second shaft 6 is supported coaxially with the first shaft 4, and the hollow portion of the first shaft 4 is supported.
One end 6a having a spline formed therein is slidably fitted and connected to 4a so as to rotate in synchronization with the first shaft 4.

A threaded portion 7 is provided in the middle of the second shaft 6.
And a female screw cylinder 10 which is supported by the bearings 8 and 9 provided on the other side wall and the intermediate wall of the housing box 1 and whose axial movement is restricted, is screwed into the threaded portion 7. By converting the linear motion due to the lateral movement of the second shaft 6 into the rotational motion of the screw cylinder 10 so as to follow the lead of the screw portion 7, an arbitrary amount of rotation angle can be obtained. is there.

Reference numeral 11 denotes a fan-shaped first eccentric weight, the base of which is fixed to the first shaft 4 via a first interlocking means 12 which will be described later in the housing box 1, and the rotating means 5 When the first shaft 4 is driven by, the eccentric portion of the first shaft 4 can obtain vibration with a constant amplitude.

Reference numeral 13 is a second eccentric weight having the same shape as the first eccentric weight 11, and its base is fixed to the second shaft 6 via a second interlocking means 14 which will be described later and which is attached to the female screw cylinder 10. Then, it can be rotated with the rotation of the second shaft 6 connected to the first shaft 4 via the female screw cylinder 10.

The second vibrating means c is arranged in parallel with the first vibrating means b in the storage box 1, and is provided on the inner wall and the intermediate wall of the storage box 1. The bearings 15 and 16 support a third shaft 17 having a predetermined distance in parallel with the first shaft 4, and the bearings 16 and 18 are coaxial with the third shaft 17 to correspond to the second shaft 6. Thus, the fourth shaft 19 is supported.

The above-mentioned first and second eccentric weights
Fan-shaped third and fourth eccentric weights 20 and 21 formed in the same manner as 11 and 13, a third eccentric weight 20 to the third shaft 17, and a fourth eccentric weight 21 to the fourth shaft 19. When the first shaft 4 is driven by the rotating means 5 by fixing the base portion thereof via the first and second interlocking means 12 and 14, the first and second interlocking means 12 and 14 are used. The vibration is transmitted to the third and fourth shafts 17 and 19, and the eccentric portion thereof provides vibration of a constant amplitude.

The above-mentioned first and second interlocking means 12, 14
Is the first axis 4 and the third axis 17, and the second axis 6 and the fourth axis.
19 and each of them are synchronized with each other to rotate in synchronization, and each employs a gear in which the same number of teeth is engraved. The meshing of these gears allows the first, second shafts 4, 6 rows and the third, fourth axis
Rows 17 and 19 are rotated in opposite directions.

Reference numeral 22 is an advancing / retreating means for moving the second shaft 6 in the axial direction, and uses an electric motor or a fluid cylinder such as a hydraulic pressure commonly used in the art.

For example, in the case of the electric motor type, as shown in FIG.
And, as shown in FIG. 5, the outer end portion 24 of the second shaft 6 is provided to project into the support frame 23 attached to the other side wall of the storage box 1 described above.
A moving body 26 having a sliding groove 25 formed in an upper portion is pivotally supported on the outer end portion 24, and a rotating body 28 is fixed to an output shaft 27 of the supporting frame 23 corresponding to the moving body 26. When the motor 29 is driven by engaging the roller 30 eccentrically attached to the rotating body 28 with the sliding groove 25 of the moving body 26 when the motor 29 is driven, the eccentric amount in the roller 30 is provided. Moves in the axial direction to move the second shaft 6 forward and backward.

In FIG. 5, reference numeral 32 is a detent member, which is a support frame.
It projects from inside 23 and engages with the concave portion 33 of the moving body 26 to prevent the rotation of the rotating means 5 with the shafts 4 and 6.

Further, in FIG. 5, numeral 34 indicates the advancing / retreating means 22.
Of the second shaft 6 connected to the outer end 24 of the advancing / retreating means 22 by detecting the number of rotations of the motor 29 using a rotary encoder or the like with a rotation detector provided at the outer end of the motor 29 in FIG. The rotation angle can be arbitrarily converted in an external remote place, and the rotation angles of the second and fourth eccentric weights 13 and 21 can be adjusted.

The advancing / retreating means 22 is not limited to an electric motor, a cylinder type, or the like, and any element can be selected as long as it can move the second shaft 6 in the axial direction. Examples thereof include cam type, crank type, rack and pinion type and the like.

By filling the bottom of the housing box 1 with lubricating oil and supplying it to the bearings 2, 3, 8, 9, 15, 16, 18 and sliding parts, each part is I try to exercise smoothly.

Further, the above-mentioned first and second vibrating means b and c can be arranged vertically or horizontally, and in the case of the vertical arrangement shown in FIG. 3, both vibrating means are provided. Vertical vibrations are offset by b and c, and only horizontal vibrations are obtained. In the case of the horizontal arrangement shown in FIG. 4, both vibration means b and c generate horizontal vibrations. The forces are canceled out to obtain a vertical excitation force, which can be appropriately combined according to the purpose of use, and the mounting portions 36 and 37 of the vibration generator A are arranged so that they can be used vertically and horizontally. If this is done, it can also be used as a single unit.

In FIG. 6, reference numeral 41 is a vibration table adopted in the vibration generator A having the above-mentioned structure.
It is used to evenly fill the molding sand used in the casting work into the metal frame. Two sets of vibration generators A are attached to the lower part of the table 44 supported by a plurality of air springs 43 on the base 42. A metal frame 46 of foundry sand is placed on the receiving member 45 on the table 44.

Further, when using the vibrating table 41 in which a large number of roller conveyors 47 axially supported by the base 42 are arranged in parallel between the table 44 and the metal frame 46 at predetermined intervals, first, When the air in the air spring 43 is discharged, the air spring 43 is compressed by the weight, so that the table
44 When the height is lowered, the receiving member 45 is buried from above the roller conveyor 47.

In this state, from one side of the vibration table 41,
A metal frame containing foundry sand to be packed into the roller conveyor 47.
When 46 is supplied, the table is rotated by rolling the roller conveyor 47.
Since it is moved to the desired position of 44, at this time, when the air spring 43 is filled with air, the air spring 43 expands due to the air pressure. The frame 46 is stably supported.

When the vibration generator A is driven, the vibration generated from the vibration generator A causes the metal frame 46 to vibrate with a predetermined vibration force, so that the molding sand in the metal frame 46 is uniformly packed into the inside thereof. It is what is done.

[0039]

In the device of the present invention configured as described above, when it is desired to convert the generated vibrational force, the eccentric weight can be operated easily and with one touch by operating the eccentric weight from the outside of the housing box. Since the phase difference can be changed,
The conversion work can be performed continuously without interruption.

Since the conversion can be varied steplessly within the range of 0 to 100%, the vibration force can be appropriately adjusted according to the processing conditions of the workpiece, so that the processing precision can be improved. Is greatly improved.

In addition to the above-mentioned action, since the phase difference of the eccentric weight can be changed during the rotation of each shaft by the rotating means, the abnormality occurring at the time of starting and stopping the eccentric weight. Since the vibration is completely eliminated, the work to which this device is attached is not damaged or adversely affects the work, and the work accuracy is improved.

Further, by arranging the first vibrating means and the second vibrating means side by side in the storage box, it is possible to easily take out the vibration only in the vertical direction or only in the horizontal direction. It is effective in work with only vibration force.

In addition, since the motor for driving the above-mentioned first and second vibrating means is a single motor, the undulation of the vibration generated when driving a plurality of motors does not occur at all, and the steady vibration is taken out. Be done. It has special effects such as.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of a vibration force varying device for a dual vibration generator according to the present invention.

FIG. 2 is a sectional view taken along line XX in FIG.

3 is a front view of the apparatus in FIG. 1 used in a vertical orientation.

FIG. 4 is a front view of the device in FIG. 1 when used sideways.

5 is a sectional view taken along line YY showing the advancing / retreating means in FIG. 1. FIG.

FIG. 6 is a front view showing a usage state of the apparatus in FIG.

FIG. 7 is a partially cutaway front view showing a conventional vibration generator.

FIG. 8 is a side view showing the relationship between the fixed weight and the adjustment weight in FIG.

[Explanation of symbols]

 1 Storage Box 4 First Shaft 5 Rotating Means 6 Second Shaft 7 Threaded Part 10 Female Threaded Cylinder 11 First Eccentric Weight 12 First Interlocking Means 13 Second Eccentric Weight b First Excitation Means c Second Excitation Means 14th Two interlocking means 17 Third axis 19 Fourth axis 20 Third eccentric weight 21 Fourth eccentric weight 22 Forward / backward means

Claims (1)

[Claims] 1. A first shaft rotatably supported in a housing box, and a second shaft slidably connected to the first shaft coaxially with the first shaft and rotating in synchronization with the first shaft. A threaded tube for screwing the threaded portion around the second shaft, and rotatably supporting the housing box, and stopping axial movement, and a first screw fixed to the first shaft. A first oscillating means composed of an eccentric weight and a second eccentric weight fixed to the female screw cylinder of the second shaft; a third shaft arranged in parallel with the first shaft at a predetermined interval; A second excitation consisting of a fourth shaft arranged in parallel with the second shaft on the same axis as the three shafts, a third eccentric weight fixed to the third shaft, and a fourth eccentric weight fixed to the fourth shaft. Means, first interlocking means for synchronously rotating the first shaft and the third shaft, second interlocking means for synchronously rotating the second shaft and the fourth shaft, and to the first shaft A vibration force varying device for a dual vibration generator, comprising: a rotating means linked to each other; and an advancing / retreating means linked to the second shaft.