JP3757704B2 - Vibration conveyor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibrating conveyor for conveying articles by horizontal vibration.
[0002]
[Prior art]
FIG. 12 shows a side view of a conventional vibration conveyor 1 and FIG. 13 shows a plan view thereof. The vibrating conveyor 1 has a trough 2, a plurality of pairs (two pairs in the drawing) arranged in the left-right direction in the width direction of the trough 2, and supports the trough 2 to vibrate the trough 2 in the horizontal direction. The linear motor 16 is an excitation source. In FIG. 13, the dotted line of the support 24 hidden under the trough 2 is omitted.
[0003]
The support members 24 are arranged in pairs in the width direction of the trough 2, and are inserted into a pair of support members 24b fixed to the ground G and a shaft 24c fixed between the pair of support members 24b. 2 and a rubber wheel 24a supported on the ground G so as to be rotatable around a shaft 24c in a vertical plane around the shaft 24c.
[0004]
The trough 2 is fixed with a primary side 18 (which is provided with a coil) of the linear motor 16 and a predetermined gap. s The opposing secondary side 17 is provided on the ground G via a vibration isolating rubber 40. A plurality of unillustrated transported objects are scattered in the trough 2, and from right to left as indicated by an arrow f 1. Transport Is done. The linear motor 16 is a high-strength linear motor, and its detailed operation will be described later, but an air current is passed through the coil on the primary side 18 to cause a gap between the primary side 18 and the secondary side 17. s A magnetic attraction force is generated in the horizontal direction to apply a horizontal thrust to the primary side 18, that is, the trough 2. Then, the direction of the thrust is changed by switching the direction of the alternating current, and the trough 2 is vibrated in the horizontal direction. At this time, the secondary side 17 receives a reaction force opposite to the thrust generated on the primary side 18, but the secondary side 17 is disposed on the ground G via the anti-vibration rubber 40. The reaction force received by the secondary side 17 is absorbed by the vibration isolating rubber 40.
[0005]
An enlarged perspective view of the linear motor 16 is shown in FIG. The primary side 18 has a substantially rectangular parallelepiped shape, and has three poles U, V, and W at the lower portion thereof, and coils 19a, 19b, and 19c are wound around the poles U, V, and W, respectively. . As shown in FIG. 15, three thin plate-like permanent magnets M are arranged on the poles U, V, and W so that the same poles are directed. On the other hand, the secondary side 17 is provided with a groove 17a in which the primary side 18 is slidably fitted in the center thereof. That is, the secondary side 17 has a concave cross section. In the groove 17a, Transport A plurality of teeth 17ab arranged in a direction perpendicular to the direction are provided so as to face the primary side 18. A gap (not shown) is provided between the tooth 17ab and the primary side 18 by a wheel (or linear guide) not shown. s Is formed.
[0006]
On the primary side 18, the horizontal direction of the primary side 18 vibration In order to detect this displacement, an encoder 21 having a magnetic sensor is provided. For example, a scale Es in which magnetic patterns are formed at equal pitches is provided on the vertical wall portion 17b of the secondary side 17, and when the primary side 18 moves in the horizontal direction due to the generation of thrust, the magnetic pattern of the encoder 21 is displayed by the magnetic sensor. A pulse signal corresponding to the reading and movement distance is obtained, and the movement amount of the primary side 18 is obtained from the count number of the pulse signal. Further, a center position detection sensor 20 is attached to the primary side 18. For example, the center position detection sensor 20 is a magnetic sensor such as a Hall element, and vibration A detected member (permanent magnet) m provided on the vertical wall portion 17b of the secondary side 17 corresponding to the center position of vibration The center position of is detected.
[0007]
On the discharge end 2a side of the trough 2, a first receiving box 22 that receives a conveyed product discharged from the trough 2, and a second receiving box 23 on the upstream side of the first receiving box 22 are disposed on the ground G. Then, as shown in FIG. 13, an opening 2 b is opened in the transport surface of the trough 2 corresponding to the position where the second receiving box 23 is arranged, and when discharging the transported material to the first receiving box 22, for example, a bolt A lid 26 is attached to the trough 2 to cover the opening 2b.
[0008]
The conventional vibrating conveyor 1 is configured as described above. Next, this operation will be described.
[0009]
The linear motor 16 is a high strength density linear motor, and this principle is disclosed in, for example, No. 128 vol. 36, No. 2 (1991), pages 86 to 93, the operation of which will be briefly described with reference to FIG.
[0010]
For example, when a current is passed through the coil U of the pole U in the direction shown in FIG. 15, a downward magnetic flux is generated by this current. Therefore, in the pole U, the downward magnetic flux generated by the permanent magnet M is strengthened, and the reverse magnetic flux is canceled out. At this time, because the poles V and W are 120 degrees and 240 degrees out of phase with respect to the pole U, current flows in the direction shown in FIG. 15 through the coils 19b and 19c. Therefore, in the poles V and W, the upward magnetic flux generated by the permanent magnet M is strengthened, and the reverse magnetic flux is canceled out. Accordingly, magnetic field lines as shown in FIG. 15 are generated, that is, a magnetic attractive force is generated between the teeth 17ab of the secondary member 17 and the poles U, V, W of the primary member 18, and the primary member. 18 moves to the left.
[0011]
That is, when an alternating current having a phase difference of 120 degrees is applied to the coils 19a, 19b, and 19c of the linear motor 16, the magnetic attraction force is replaced by the teeth 17ab instead of the poles U, V, and W in this order. And the poles U, V, and W, which causes the primary side member 18 to move to the left.
[0012]
Accordingly, the trough 2 to which the primary side member 18 is attached moves to the left. At this time, the secondary side member 17 receives a reaction force opposite to the thrust generated in the primary side member 18 via a non-magnetic wheel (not shown), and a force to move to the right acts. However, since the secondary side member 17 is disposed on the installation surface (ground G) via the vibration isolation rubber 40, the reaction force received by the secondary side member 17 is caused by the vibration isolation rubber 40. Absorbed. At this time, the currents of the coils 19a, 19b, and 19c are adjusted so that the trough 2 is slowly accelerated, that is, the primary member 18 attached to the trough 2 is slowly accelerated.
[0013]
Next, a current is applied to the coils 19a, 19b, and 19c of the poles U, V, and W in the opposite direction to move the primary member 18 and the trough 2 to which the primary member 18 is attached to the right. At this time as well, the secondary side member 17 receives a reaction force, which is absorbed by the antivibration rubber 40. In this case, trough 2 Transported goods Accelerates to the right with the force to overcome the static friction force of ( Transported goods The currents of the coils 19a, 19b, and 19c are adjusted so that only the trough 2 moves), that is, the primary side member 18 can be accelerated quickly.
[0014]
By repeating the above series of operations, that is, the trough 2 is Transport When moving in the same direction as direction f, slowly Transport When moving in the direction opposite to the direction f, the vibratory conveyor 1 vibrates so that only the trough 2 moves backward, and the conveyance object on the trough 2 is moved to the left. Transport to To do.
[0015]
Transport The transported material is discharged from the discharge end 2 a of the trough 2 to the first receiving box 22 or the second receiving box 23, and FIGS. 12 and 13 show a case of discharging to the first receiving box 22. . That is, the primary side 18 and the vibration center C <b> 1 of the trough 2 are set so that the discharge end 2 a is positioned corresponding to the first receiving box 22. That is, the encoder 21 (see FIG. 14) attached to the primary side 18 measures the strokes of the primary side 18 and the trough 2, and the center position detection sensor 20 (also attached to the primary side 18) ( When the vibration center C1 (permanent magnet m as a member to be detected provided at a position corresponding thereto) is detected by the magnetic sensor, the counter value of the encoder 21 is reset and the vibration center C1 is detected. Downstream and upstream in the transport direction f When the same value is counted (the stroke is the same), the direction of the current passed through the coils 19a, b, c on the primary side 18 is reversed. In this way, the trough 2 vibrates around C1. At this time, the opening 2 b shown in FIG. 13 is closed by the lid 26.
[0016]
Next, for example, when another type of conveyed product is to be discharged into the second receiving box 23, the lid 26 covering the opening 2b opened on the conveying surface of the trough 2 on the second receiving box 23 is removed, and the conveyed item is removed. It is dropped from the opening 2b and discharged to the second receiving box 23.
[0017]
[Problems to be solved by the invention]
As described above, conventionally, when it is desired to change the discharge position of the conveyed product, the opening 2b is opened on the transfer surface of the trough 2 corresponding to the changed discharge position. Therefore, it is necessary to process the trough 2 to provide the opening 2b, which is troublesome and costly. When discharging to the first receiving box 22, the opening 2 b is covered with the lid 26, but the conveyed product spills from the gap between the lid 26 and the opening 2 b, or a step between the lid 26 and the opening 2 b. There is a risk that the transported product will get caught and the transported product will stagnate. In addition, when a slide type lid is used, the conveyed product is easily clogged between the lid and the trough, and it is difficult to clean this portion. Further, the conventional method cannot be applied when the discharge position is changed downstream from the first receiving box 22.
[0018]
The present invention has been made in view of the above-described problems, and it is an object to provide a vibrating conveyor that can easily change the discharge position of a conveyed product without incurring labor and cost, and that does not stagnate the conveyance of the conveyed item. To do.
[0019]
[Means for Solving the Problems]
In solving the above problems, the vibrating conveyor according to the present invention is such that either the primary side or the secondary side of the linear motor is fixed to a linear trough supported by a support so as to vibrate in the horizontal direction. Vibration on the secondary or secondary side of Center position detection sensor for detecting the center position and the center
Displacement measuring means for measuring the displacement from the center position is attached. And vibration of By changing the center position, the position where the conveyed product is discharged from the trough is changed.
[0020]
Alternatively, the vibration conveyor of the present invention vibrates a plurality of linear troughs arranged in series with respect to the vibration direction by the respective linear motors, and the troughs are vibrated. of It is designed to vibrate around the center position so that the transported material is sequentially transported from the upstream trough to the downstream trough in the transport direction, and the phase of vibration displacement between at least one pair of adjacent troughs is different. Thus, a gap is formed between the troughs during vibration so that the conveyed product can be discharged from the gap.
[0021]
Alternatively, the vibratory conveyor of the present invention vibrates a plurality of linear troughs arranged in series with respect to the vibration direction by the respective linear motors, and the troughs are vibrated. of By vibrating around the center position, the transported materials are sequentially transported from the upstream trough to the downstream trough in the transport direction, and any one trough except the trough located at the most upstream side is stopped. In addition, a gap is formed between the upstream trough adjacent to the stopped trough so that the conveyed product can be discharged from the gap.
[0022]
Alternatively, the vibratory conveyor of the present invention vibrates a plurality of linear troughs arranged in series with respect to the vibration direction by the respective linear motors, and the troughs are vibrated. of By vibrating around the center position, the transported material is sequentially transported from the upstream trough to the downstream trough in the transport direction, and vibration of at least one trough of The central position is related to the transport direction from the position when transported objects are transported sequentially from the upstream trough to the downstream trough. Downstream or upstream In this way, a gap is formed between this trough and the adjacent trough so that the conveyed product can be discharged from this gap.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the same parts as those in the conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0024]
FIG. 1 shows a side view of an oscillating conveyor 11 according to a first embodiment of the present invention. The oscillating conveyor 11 is provided with a trough 12, a support 24 that supports the trough 12 in a plurality of pairs (two pairs in the figure) arranged in the lateral direction of the trough 12, and for vibrating the trough 12 in the horizontal direction. And a linear motor 16 which is a vibration source.
[0025]
The support body 24 has the same configuration as that of the conventional example, and a pair of support members 24b arranged in pairs in the width direction of the trough 12 and fixed to the ground G are fixed between the pair of support members 24b. The rubber wheel 24a is inserted into the shaft 24c, is in contact with the bottom of the trough 12, and is supported on the ground G so as to be rotatable around the shaft 24c in a vertical plane.
[0026]
A primary side 18 of the linear motor 16 is fixed to the trough 12 and a predetermined gap is provided between the primary side 18 and the linear motor 16. s The opposing secondary side 17 is provided on the ground G via a vibration isolating rubber 40. A plurality of unillustrated transported objects are scattered in the trough 12, and from right to left as indicated by an arrow f. Transport Is done. Since the linear motor 16 is the same high strength density linear motor as the conventional example, a detailed description thereof will be omitted. That is, by passing an alternating current through the coil on the primary side 18, the gap between the primary side 18 and the secondary side 17 s A magnetic attraction force is generated to apply a horizontal thrust to the primary side 18, that is, the trough 12. And the direction of thrust is changed by switching the direction of alternating current, and the trough 12 is vibrated in a horizontal direction. At this time, the secondary side 17 receives a reaction force opposite to the thrust generated on the primary side 18 and tries to move in the direction opposite to the primary side 18, that is, the trough 2. Since it is disposed on the ground G via the vibration isolating rubber 40, the reaction force received by the secondary side 17 is absorbed by the vibration isolating rubber 40.
[0027]
As in the prior art, as shown in FIG. 14, the primary side 18 has a horizontal direction of the primary side 18. vibration In order to detect this displacement, an encoder 21 having a magnetic sensor is provided. Then, for example, when a scale Es having a magnetic pattern is provided on the vertical wall portion 17b of the secondary side 17, and the primary side 18 moves in the horizontal direction due to the generation of thrust, a pulse signal corresponding to the movement distance is obtained. The displacement amount of the movement of the primary side 18 is obtained from the count number of the pulse signal. Further, a center position detection sensor 20 is attached to the primary side 18. For example, the center position detection sensor 20 is a magnetic sensor (for example, a Hall element), and a vertical wall on the secondary side 17 corresponding to the center position. A member to be detected (permanent magnet) m is provided in the portion 17b to detect the center position.
[0028]
On the discharge end 12a side of the trough 12, a first receiving box 22 for receiving the conveyed product discharged from the trough 12, and a second receiving box 23 on the upstream side thereof are arranged on the ground G. And unlike the trough 2 of a prior art example, the trough 12 of this Embodiment is not opened by the conveyance surface corresponding to the arrangement position of the 2nd receiving box 23. FIG. Therefore, there is no lid that closes the opening, and no step is formed, which is smooth.
[0029]
The vibration conveyor 11 according to the present embodiment is configured as described above. Next, this operation will be described.
[0030]
The trough 12 is moved by the linear motor 16 Transport When moving in the same direction as direction f To move with the transported goods Slowly Move , Transport Only the trough 12 moves backward when moving in the direction opposite to the direction f. Move fast Then, the vibration conveyor 11 vibrates and transports the goods on the trough 12. In FIG. Left Downstream of What Transport To do.
[0031]
Transport The conveyed product thus discharged is discharged from the discharge end 12 a of the trough 12 to the first receiving box 22 or the second receiving box 23. A trough 12 and a primary side 18 indicated by a solid line in FIG. 1 indicate a case where a conveyed product is discharged to the first receiving box 22. That is, the vibration side C <b> 1 of the primary side 18 and the trough 2 is set so that the discharge end 12 a is positioned corresponding to the first receiving box 22. That is, the encoder 21 attached to the primary side 18 measures the strokes of the primary side 18 and the trough 12, but the center position detection sensor 20 (magnetic sensor) attached to the primary side 18 again. When the vibration center C1 (permanent magnet m as a member to be detected provided at a position corresponding to this) is detected, the counter value of the encoder 21 is reset and the vibration center C1 is reset. Downstream and upstream When the same value is counted (the stroke is the same), the direction of the current flowing through the coils 19a, b, c on the primary side 18 is reversed. In this way, the trough 12 vibrates around C1.
[0032]
Next, when it is desired to discharge the conveyed product to the second receiving box 23, the vibration center of the trough 12 and the primary side 18 is shifted from the position C1 to the position C2, so that the position of the discharge end 12a is changed to the second receiving box 23. Set to the installation position. The trough 12 and the primary side 18 oscillating around C2 are indicated by a one-dot chain line in FIG. For example, the member to be detected (permanent magnet) m provided on the vertical wall portion 17b of the secondary side 17 is changed from the position C1 to C2, and this is detected, so that the trough 12 vibrates around C2. To.
[0033]
Thereby, it is not necessary to process the trough 12 to open the opening, the discharge destination of the conveyed product can be easily changed without taking time and cost, and further, the conveyance of the conveyed product is not hindered. Further, the discharge destination can be changed to the upstream side or the downstream side in the transport direction.
[0034]
Next, a second embodiment of the present invention will be described.
[0035]
In the present embodiment, a case where a plurality of troughs are arranged in series in the transport direction is considered. FIG. 2 shows the vibrational displacement of each end of each of a set of two adjacent troughs, an upstream trough 31 and a downstream trough 32. In the figure, a side view of only the two troughs 31 and 32 at the boundary is shown. As in the first embodiment, the primary side 18 of the linear motor 16 is fixed to each trough, and the primary side. 18 is a gap s Is opposed to the secondary side 17. Further, the secondary side 17 is provided with a magnetic pattern scale Es and a detected member m 1, and the primary side 18 reads the scale Es and counts the amount of movement, and detects the detected member m 1 and detects the center of vibration. A center position detecting sensor 20 is attached. This is also true for all the conveyors of the following embodiments.
[0036]
In FIG. 2, x1 represents the displacement of the downstream end of the upstream trough 31, and c1 is the vibration center thereof. x2 represents the displacement of the upstream end of the downstream trough 32, and c2 is the vibration center thereof. x1 and x2 have the same amplitude and the same period T, and FIG. 2A shows a case where they are displaced in the same phase. In other words, the upstream trough 31 and the downstream trough 32 always vibrate while maintaining a state where the lengths d overlap each other. Therefore, the conveyed product on the upstream trough 31 is conveyed to the downstream trough 32 as it is.
[0037]
FIG. 2B shows a state where the phase of the displacement x1 at the downstream end of the upstream trough 31 is shifted by T / 2 from the state shown in FIG. 2A. The positions of the vibration centers c1 and c2 remain unchanged. At this time, the upstream trough 31 and the downstream trough 32 are t as shown in FIG. ₁ ~ T ₇ The relative positional relationship as shown in the figure is obtained at each moment. t ₁ ~ T _Three Until the upstream trough 31 and the downstream trough 32 are displaced in opposite directions (the upstream trough 31 moves backward and the downstream trough 32 moves forward), and the time t _Three After that, a gap is formed between the downstream end of the upstream trough 31 and the upstream end of the downstream trough 32.
[0038]
Then time t _Five Thus, the upstream trough 31 is displaced most upstream, the downstream trough 32 is displaced most downstream, and the gap between the troughs is maximized. After this, each trough wraps around. That is, the upstream trough 31 moves forward, the downstream trough 32 moves backward, and the gap between the troughs gradually decreases, and the time t ₆ The gap is closed. And time t ₈ Then, a gap begins to be formed again between the troughs. Thereafter, the gap periodically opens and closes. That is, the gap is indicated by the diagonal lines in FIG. But It is formed.
[0039]
2C and 2D show a state in which the phase of the displacement x1 at the downstream end of the upstream trough 31 is shifted from the state of FIG. 2A by T / 4 and T / 6, respectively. As in FIG. 2B, the gap between the troughs 31 and 32 is also indicated by hatching. But It is formed.
[0040]
In order to drop the conveyed product from the gap formed between the troughs 31 and 32 to the receiving box disposed below or the distribution conveyor disposed at right angles to the troughs 31 and 32, a gap is formed. When the transported object is in the transport direction with respect to the upstream trough 31 Sliding Must be.
[0041]
Therefore, the movement of the trough and the conveyed product will be described with reference to FIG.
[0042]
In FIG. 4, x is the trough displacement, v is the trough speed, and a is the trough acceleration. All are displacement, velocity, and acceleration with respect to the stationary part. The speed of the transported object relative to the stationary part is indicated by w. Looking at a certain period, the time t just before the trough reaches the maximum displacement position in the forward direction ₁ 'Adds more acceleration in the opposite direction to the trough, and the speed begins to decrease sharply. At this time, there is a difference in the speed between the trough and the transported object with respect to the stationary part. In other words, the transported object is in the forward direction due to inertia with respect to the trough. Sliding Begin.
[0043]
After that, the trough changes its direction and begins to retreat, at time t ₂ 'The trough and transport speed match. In other words, Sliding Stops. At this time, the trough position x is near the vibration center. Therefore, just before the trough reaches the maximum displacement position in the forward direction, it turns and vibrates. of During the time t 'until it returns to the center position, the conveyed product moves forward with respect to the trough. Sliding ing. The area of the shaded area L is Sliding It becomes the distance.
[0044]
Therefore, also in FIGS. 2B, 2C, 2D, the conveyed product is against the upstream trough 31 during time t ′. Sliding It will be. In the state of B and C, no gap is opened at this time. Therefore, the conveyed product does not fall into the receiving box or the distribution conveyor. In the state of D, the conveyed item is Sliding Since a gap is formed when it is stuck, it can be dropped from this gap to a receiving box or a distribution conveyor. Therefore, in this embodiment, when the phase difference of the displacement between the upstream trough 31 and the downstream trough 32 is set to be near T / 6, the conveyed product can be distributed halfway.
[0045]
Transported goods on the trough Sliding The time during which the trough is applied can be changed by adjusting the magnitude of acceleration applied to the trough and the ratio of the magnitude of acceleration when the trough is moved forward and backward. Therefore, even if the trough moves backward past the vibration center due to this adjustment, Sliding If it is made to fall, even if it is a phase difference of FIG.
[0046]
Next, how to shift the phase will be described. In FIG. 5, the upstream trough 31 vibrates around c1 ′, and the downstream trough 32 vibrates around c2 ′. At the same phase shown in FIG. 2A, the centers of the upstream trough 31 and the downstream trough 32 pass through the vibration centers c1 ′ and c2 ′ in the same direction at the same time. That is, each center position detection sensor 20 detects the detected member m 2 at the same time.
[0047]
In order to set the phase difference of T / 2 as shown in FIG. 2B, the upstream trough 31 is first stopped at the position of the vibration center c1 ′. That is, when the center position detecting sensor 20 attached to the primary side 18 detects the detected member m 2 attached to the secondary side 17, the energization of the coil on the primary side 18 is stopped. When the downstream trough 32 passes through the vibration center c2 ′, that is, when the time T / 2 has elapsed since the center position detection sensor 20 of the downstream trough 32 detected the detected member m 2, the upstream side The trough 31 is driven in the same direction as the movement direction (forward or backward) when the downstream trough 32 passes the vibration center c2 ′. Thereafter, the upstream trough 31 and the downstream trough 32 vibrate with a phase difference of T / 2. Whether the downstream trough 32 is moving forward or backward when passing through the vibration center c2 ′ can be seen from the direction of the current flowing through the coil on the primary side 18. Alternatively, the downstream trough 32 may be stopped so as to follow the upstream trough 31 with a time delay.
[0048]
In the case of the phase differences T / 4 and T / 6 in FIGS. 2C and 2D, the phase difference is given as in the case of T / 2. That is, one of the troughs is stopped at the center of vibration, and after the time of T / 4 and T / 6 has elapsed since the other trough has passed the center of vibration, the other is moving the trough that has been stopped. Drive in the same direction as the trough.
[0049]
As described above, according to the present embodiment, when a transported object is sequentially transported from a plurality of troughs arranged in series to an upstream trough, the displacement phase between adjacent troughs is determined. The transported goods can be easily distributed just by shifting. It is not necessary to form an opening for distribution in the trough, and the stagnation of the conveyed product does not occur. Also, the trough itself does not move, that is, it vibrates of Only the phase between adjacent troughs is shifted without changing the center position. In order to change the position of the trough itself, the length of the linear motor is added to the normal vibration amplitude and the trough position is shifted. Therefore, the cost of expensive linear motors can be reduced.
[0050]
Next, a third embodiment of the present invention will be described.
[0051]
In the present embodiment, as shown in FIG. 6, when the downstream trough 32 is displaced to the most downstream side, the downstream trough 32 is stopped at that position. For example, a limit switch is provided in which the downstream end of the downstream trough 32 comes into contact when the downstream trough 32 is displaced to the most downstream side, and the ON signal of this switch is received to the coil on the primary side 18 of the downstream trough 32. Shut off the power of the.
[0052]
Alternatively, the amount of movement of the downstream trough 32 is measured by the encoder 21, and the direction of the current passed through the coil on the primary side 18 is changed based on the count value of the encoder 21 at the turn-back position, that is, the maximum position of the vibration displacement. Therefore, it is possible to stop energization instead of changing the direction of the current flowing through the coil.
[0053]
In the present embodiment, gaps are periodically formed between the troughs 31 and 32 as shown by the oblique lines in FIG. Sliding Since the gap is formed at the time t ′ during which the conveyance is performed, the conveyed product can be distributed on the way. Also in this embodiment, since the downstream trough 32 is stopped within the trough amplitude range, the linear motor does not need an extra length.
[0054]
Next, a fourth embodiment of the present invention will be described.
[0055]
FIG. 7 schematically shows only three troughs 33, 34, 35 arranged in series, where reference A indicates a plan view, and reference B indicates a side view thereof. A distribution conveyor 36 is disposed below the boundary between the troughs 34 and 35. The troughs 33, 34 and 35 vibrate around c3, c4 and c5, respectively. In the present embodiment, the position of the trough itself is changed to form a gap between adjacent troughs. That is, the code C On the side view Indication You The trough 34 in the middle with respect to the transport direction f 1 Upstream It is made to retreat and vibrate around c4 ′.
[0056]
By the way, if the three troughs have the same amplitude and vibration frequency but the displacement phase is different, a gap is formed between adjacent troughs as described above. This is inconvenient when transporting to the downstream trough 35. Therefore, in a conveyor in which troughs are usually arranged in series, the overlap length between adjacent troughs is increased so that no gap is formed even if the phases between the troughs are different.
[0057]
When the trough itself is shifted to form a gap for distribution in the middle, the linear motor needs a length corresponding to this shift in addition to the normal amplitude, and further increases the overlap between the troughs. In this case, since the amount of shifting the trough to form the gap becomes larger, the linear motor must be lengthened correspondingly, which increases costs.
[0058]
Therefore, in the present embodiment, the linear motor is driven by giving a common speed command to the linear motors that vibrate each of the three troughs. That is, as shown in FIG. 7, the saw-tooth speed commands v3, v2, v1 are usually given from the controllers 43, 44, 45 to the drivers 46, 47, 48, and the drivers 46, 47, 48 are speeds. In response to the commands v3, v2, and v1, a current is passed through the coils of the linear motors. In this embodiment, the three linear motors are driven with a common speed command v1.
[0059]
Note that when the linear motor is driven only by the speed command, the primary side that moves with the trough due to the offset of the command signal is overrun with respect to the secondary side that is fixed on the ground. As described in the first embodiment, the controllers 43, 34, and 35 receive signals from the encoder 21 and the center position detection sensor 20 so as to vibrate about c3, c4 ′, and c5. In 44 and 45, position correction is performed.
[0060]
As described above, in the present embodiment, the troughs are vibrated with the common speed command v1, and therefore the amplitude, vibration frequency, and displacement phase can be matched, that is, vibrate as shown in FIG. 2A. Therefore, the amount of overlap between adjacent troughs can be reduced, and the trough 34 is shifted in the backward direction when it is desired to distribute the conveyed product to the conveyor 36. However, the amount of shift at this time can be reduced.
[0061]
Next, a fifth embodiment of the present invention will be described.
[0062]
The three troughs 33, 34, and 35 require individual adjustments such as acceleration and amplitude to be applied depending on conditions such as weight, length, and inclination. If the speed command is made common as in the fourth embodiment, this individual adjustment cannot be performed. Although it is possible to adjust the individual speed commands by providing an amplifier, it takes time and effort to optimally adjust all the speed commands.
[0063]
Therefore, in the present embodiment, the speed commands v3, v2, and v1 are given to the troughs 33, 34, and 35, the periods of these speed commands are matched, and the phase of the vibration displacement of each trough is matched. Let
[0064]
FIG. 8A shows the time change of the speed command v1, and B shows the time change of the speed command cycle counter that determines this cycle. C is a synchronizing signal whose level changes in synchronization with the speed command cycle counter, and clears each speed command cycle counter that determines the cycle of the other speed commands v2 and v3 in accordance with the fall of this sync signal. The three speed commands v1, v2, and v3 are synchronized. The frequency is set to the same value for each controller in advance.
[0065]
As a result, each trough is vibrated synchronously with the same frequency and phase, and then depending on the weight of each trough, each trough has a saw-like speed command with an upward slope and a downward slope. Speed commands with different ratios (duties) can be given. That is, the acceleration can be set individually.
[0066]
Next, a sixth embodiment of the present invention will be described.
[0067]
In the present embodiment, as shown in FIG. 9, the edge 61a at the downstream end of the upstream trough 61 is formed to be inclined rather than parallel to the width direction of the trough. FIG. 10 shows this side view. Both troughs 61 and 62 vibrate synchronously in the same phase. That is, the relative positional relationship between the ends of each trough does not change during vibration.
[0068]
Here, in order to distribute the conveyed product, one or both of the troughs 61 and 62 are shifted to form a gap between the troughs as shown in FIG. At this time, the size of the maximum width g 1 (in the width direction of the trough) of the gap is adjusted by adjusting the amount of shifting the trough. Thereby, the fall amount (distribution amount) from the gap | interval of a conveyed product can be adjusted.
[0069]
As mentioned above, although each embodiment of this invention was described, of course, this invention is not limited to these, A various deformation | transformation is possible based on the technical idea of this invention.
[0070]
In the embodiment described above, when changing the center of vibration by changing the trough itself, it may be performed using the measurement of the stroke by the encoder 21 in addition to changing the attachment position of the detected member m. For example, if C2 is at a position moved by a certain counter value to the right from C1, the primary side 18 and the trough 12 are moved to C2 based on this counter value, and the encoder 21 is moved to this position (C2). The counter value may be reset to vibrate with C2 as the vibration center of the trough 12, that is, the position of the discharge end 12a may be changed.
[0071]
In the above embodiment, the linear motor 16 having the driving principle of a high strength density linear motor is used as the linear motor. However, other linear motors such as a known linear induction motor or linear pulse motor (for example, Japanese Patent No. 1495069) may be used. Moreover, in the said embodiment, although the secondary side 17 was arrange | positioned on the ground and the primary side 18 was fixed to the trough 12, this arrangement | positioning relationship may be reversed.
[0072]
In the above embodiment, the center position detection sensor is a magnetic sensor. However, the present invention is not limited to this. For example, an optical sensor composed of a pair of light emitting elements and light receiving elements is used, and the detected member is a flat plate. The center position may be detected depending on whether it is in a light shielding state or a transmission state so that it can be interposed between the light emitting element and the light receiving element.
[0073]
Further, instead of the first receiving box 22 and the second receiving box 23 in the first embodiment, the conveyed product discharged from the trough 12 may be a belt conveyor that conveys the trough 12 in a direction perpendicular to the trough 12, for example. . If it does so, a conveyed product can be supplied to a separate place according to a kind.
[0074]
【The invention's effect】
As described above, according to the vibration conveyor of the present invention, the discharge position of the conveyed product can be easily changed without taking time and cost. In a conveyor where a plurality of troughs are lined up, a conveyed product can be distributed on the way. Moreover, the conveyance of a conveyed product is not prevented.
[Brief description of the drawings]
FIG. 1 is a partially cutaway side view of a vibrating conveyor according to a first embodiment of the present invention.
FIG. 2 is a diagram showing displacement due to vibration of each end of adjacent troughs in a vibrating conveyor according to a second embodiment of the present invention, where A is a position when both troughs vibrate in the same phase; Phase differences T / 2 and C indicate a phase difference T / 4, and D indicates a case where vibration is generated with a phase difference T / 6.
FIG. 3 is a diagram showing the positions of both troughs at each moment in FIG. 2B.
FIG. 4 is a diagram showing temporal changes in trough position, velocity, and acceleration.
FIG. 5 is a side view of a main part of two adjacent conveyors.
FIG. 6 is a diagram showing the displacement of each end of adjacent troughs in a vibrating conveyor according to a third embodiment of the present invention.
FIG. 7 is a schematic diagram of a vibrating conveyor and a block diagram of a drive control unit according to a fourth embodiment of the present invention.
FIG. 8 is a time chart for explaining a fifth embodiment of the present invention, in which A is a speed command, B is a cycle counter for determining a cycle of the speed command, and C is a synchronization signal synchronized with the cycle counter. .
FIG. 9 is a plan view of a boundary portion between an upstream trough and a downstream trough according to a sixth embodiment of the present invention.
FIG. 10 is a side view of the same.
11 is a plan view showing a state in which a trough is changed from the state shown in FIG. 9 to form a gap between the troughs. FIG.
FIG. 12 is a partially broken side view of a conventional vibration conveyor.
FIG. 13 is a plan view of the same.
FIG. 14 is an enlarged perspective view of a linear motor.
FIG. 15 is a schematic sectional view of the same.
[Explanation of symbols]
11 Vibrating conveyor
12 trough
16 Linear motor
17 Secondary side
18 Primary side
20 Center position detection sensor
21 Encoder
22 First box
23 Second box
24 Support
31 Upstream trough
32 Downstream trough
33 Trough
34 Trough
35 trough
36 Distribution conveyor
61 Upstream trough
62 Downstream trough
a Trough acceleration
c1 Center of vibration at the downstream end of the upstream trough
c2 Center of vibration at the upstream end of the downstream trough
C1 center of vibration
C2 center of vibration
c1 'center of vibration
c2 'center of vibration
c3 Center of vibration
c4 Center of vibration
c4 'center of vibration
c5 Center of vibration
Es magnetic scale
f Transport direction
L Distance traveled with respect to the trough
m Permanent magnet
s Void
t ' Sliding Time
v Trough speed
v1 Speed command
v2 Speed command
v3 Speed command
w Conveyed object speed relative to stationary part
x Trough displacement
x1 Displacement at the downstream end of the upstream trough
x2 Displacement of the upstream end of the downstream trough

Claims (11)

A straight trough, a support body that supports the trough so as to vibrate in the horizontal direction, and a linear motor that vibrates the trough with either the primary side or the secondary side fixed to the trough. The center side detection sensor for detecting the center position of the trough vibration and the displacement measuring means for measuring the displacement from the center position are attached to the primary side or the secondary side, and the center position is the center of vibration. In the vibration conveyor which vibrates the trough as described above and conveys the conveyed product on the trough,
A vibrating conveyor characterized in that the position at which the conveyed product is discharged from the trough is changed by changing the center position.   The displacement measuring means is an encoder that counts the number of pulses corresponding to the displacement, and when the center position is detected, the count value of the encoder is calibrated to 0 or a predetermined value. 2. The vibration conveyor according to 1.   The vibrating conveyor according to claim 1 or 2, wherein the center position detecting sensor is an optical sensor.   The vibrating conveyor according to claim 1 or 2, wherein the center position detecting sensor is a magnetic sensor. A plurality of linear troughs arranged in series with respect to the vibration direction, a support that supports these troughs so as to vibrate in the horizontal direction, and either one of the primary side or the secondary side is fixed to each of the troughs. A linear motor that vibrates each trough, and a center position detection sensor that detects the center position of vibration of each trough on the primary side or the secondary side, and a displacement that measures displacement from the center position In the vibration conveyor to which the measurement means is attached, the plurality of troughs are vibrated with the respective center positions as vibration centers, and the conveyed product is sequentially conveyed from the upstream trough to the downstream trough in the conveying direction.
The phase of vibration displacement between at least one pair of adjacent troughs is made different so that a gap is formed during vibration between these troughs so that the transported material can be discharged from the gap. Vibrating conveyor characterized by. A plurality of linear troughs arranged in series with respect to the vibration direction, a support that supports these troughs so as to vibrate in the horizontal direction, and either one of the primary side or the secondary side is fixed to each of the troughs. A linear motor that vibrates each trough, and a center position detection sensor that detects the center position of vibration of each trough on the primary side or the secondary side, and a displacement that measures displacement from the center position In the vibration conveyor to which the measurement means is attached, the plurality of troughs are vibrated with the respective center positions as vibration centers, and the conveyed product is sequentially conveyed from the upstream trough to the downstream trough in the conveying direction.
Any one trough except the trough located at the most upstream side is stopped, and a gap is formed between the stopped trough and the upstream trough adjacent to the stopped trough, and the transported material is discharged from the gap. A vibrating conveyor characterized by being able to do so. A plurality of linear troughs arranged in series with respect to the vibration direction, a support that supports these troughs so as to vibrate in the horizontal direction, and either one of the primary side or the secondary side is fixed to each of the troughs. A linear motor that vibrates each trough, and a center position detection sensor that detects the center position of vibration of each trough on the primary side or the secondary side, and a displacement that measures displacement from the center position In the vibration conveyor to which the measurement means is attached, the plurality of troughs are vibrated with the respective center positions as vibration centers, and the conveyed product is sequentially conveyed from the upstream trough to the downstream trough in the conveying direction.
The central position of at least one trough is shifted from the position at which the transported object is sequentially transported from the upstream trough to the downstream trough to the downstream or upstream side in the transport direction, A vibratory conveyor characterized in that a gap is formed between the trough and the adjacent trough so that the conveyed product can be discharged from the gap.   8. The vibration conveyor according to claim 7, wherein the phase of vibration displacement of each of the plurality of troughs is matched.   9. The vibrating conveyor according to claim 8, wherein the plurality of troughs are vibrated at a common speed command value so that the phases of the vibration displacements of these troughs coincide with each other.   A plurality of troughs are vibrated with different speed command values, and a synchronization signal synchronized with a speed command cycle counter that determines a cycle of a speed command value serving as a reference among the speed command values is synchronized with a cycle of another speed command value. 9. The vibration conveyor according to claim 8, wherein a phase of vibration displacement of the plurality of troughs is made to coincide with each other by supplying to a speed command cycle counter that determines the number of troughs.   A width direction of the trough in the gap is changed by inclining an edge of a downstream end of the upstream trough facing the downstream trough across the gap with respect to a width direction of the trough and changing an amount of the transition of the trough. 9. The vibrating conveyor according to claim 8, wherein the size in a direction parallel to the vibration is changed.

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