JP2974956B2 - 3D conveyor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional conveyor and a control method thereof.

[0002]

2. Description of the Related Art Conventionally, a three-dimensional conveyor is known in which an endless belt is spirally wound around a rotatable drum having a vertical cylindrical shape, and the belt is circulated. This three-dimensional conveyor is mainly used for minimizing the occupied space when it is necessary to maintain a conveyed material in a long-time conveying state, for example, when food is subjected to processing such as freezing, drying, heating and the like. Things.

[0003] In this three-dimensional conveyor, the diameter and height of the drum are made compact, the loading and unloading ports of the transported material are both set to be upper or lower, and a plurality of processes are performed on the transported material around the drum. In order to meet the demands such as how to use it, there is a type (twin type) configured to include two drums exclusively for upward and downward.

This twin-type three-dimensional conveyor has a mechanical power distribution device for rotating two drums and feeding a belt body by using power taken out from a large-capacity motor via a gear mechanism or the like. Is usually there,
A power distribution device that performs rotation of each drum and feed of a belt body by three independent servo motors and the like, and performs feedback control of each rotation speed by a computer (see Japanese Patent Application Laid-Open No. 5-270636). Is also known.

[0005]

The above-mentioned mechanical power distribution device has a complicated and large-sized structure, has a large power transmission loss, and has to exchange gears and the like when adjusting the tension of the belt body. However, there is a disadvantage that handling is extremely troublesome. In particular, since it is not possible to cope with fluctuations in the belt body during operation,
The drum may be excessively tightened or loosened by the belt member, and in the worst case, the belt member may be broken at a portion passing between the drums.

On the other hand, the above-described power distribution device using a computer requires various sensors for detecting the number of revolutions of each motor, detecting the tension of the belt body, and the like. Have various difficulties that they are easily contained. In the three-dimensional conveyor, the peripheral speed of the drum is set to be higher than the surface speed of the belt in order to absorb the fluctuation of the tension of the belt during operation. State (this is called overdrive control).

The above-described power distribution device using a computer has been proposed to enable such overdrive control that could not be achieved with a mechanical power distribution device. Since it easily fluctuates due to various factors such as the degree of wear of the body or the elongation of the belt body, for example, when it is detected that the drum is excessively tightened by the belt body, it can be over-relaxed by controlling the speed. On the other hand, if excessive loosening is detected, overtightening may occur, and if this occurs alternately, the belt body will have an endless shark phenomenon, and good results have been obtained. It was not possible.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is capable of performing simple and accurate control and maintaining a complicated structure in maintaining a predetermined constant tension of a belt body.
It is an object of the present invention to provide a three-dimensional conveyor that does not cause an increase in size, a rise in equipment costs, and the like.

[0009]

According to the present invention, the following technical measures have been taken in order to achieve the above object. In other words, according to the first aspect of the present invention, the vertical drum and the first motor for rotating the vertical drum, the vertical drum and the second motor for rotating the vertical drum, and between the two drums In a three-dimensional conveyor having an endless belt member and a third motor for feeding the endless belt member, each of which has an outer surface wound spirally, an ascending drum by the first motor is higher than the surface speed of the belt member by the third motor. And the rotation speed of each motor is set so that the peripheral speed of the descending drum by the second motor is higher than the peripheral speed of the upward drum. Using an induction motor for
The circumferential speed of the upward drum is 3 to 3 times the surface speed of the belt body.
8% increase, and the peripheral speed of the downward drum is
It is characterized by operating with the surface speed increased by 8 to 12% .

The speed difference between the first to third motors is as follows.
With respect to the ascending drum and the descending drum, the belt body can be held in a state of causing slippage (overdrive control state). The speed difference between the surface speed of the belt body and the peripheral speed of the ascending drum at this time is due to the fact that the belt body wound around the ascending drum has a lead angle inclined above a horizontal plane. It is assumed that the speed is increased somewhat more than the speed is increased.

[0011] Further, in the upward drum, the inclination direction of the belt body is upwardly sloped, so that it is necessary to impart a winding force to the belt body. However, in the downward drum, the inclined direction of the belt body becomes downwardly sloped. Since the winding force hardly needs to be considered, the downward drum is rotated at a higher speed than the upward drum. The use of the induction motor for at least two of the first to third motors allows the rotation speed of the motor itself to be reduced when excessive tension occurs in the belt body. . Needless to say, when the tension of the belt body is restored to the original state, the rotation speed of the motor is automatically restored.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a three-dimensional conveyor 1 according to one embodiment of the present invention.
The drum includes a rotatable upward drum 2 and a downward drum 3 having a vertical cylindrical shape, and an endless belt body 4 in which the outer surfaces of the two drums 2 and 3 are spirally wound, respectively.

A lower part of the upward drum 2 is provided with a first motor 7 for rotation thereof, and a lower part of the downward drum 3 is provided with a second motor 8 for rotation thereof. A third motor 9 for feeding the belt body 4 extending between the lower portions of the two drums 2 and 3 is provided. As shown in FIGS. 2 and 3, the first motor 7 and the second motor 8 serve to rotate the pinion 12 that can be driven to rotate via a speed reducer (not shown). Is meshed with an inner ring gear 13 provided at the lower inner peripheral portion of the gear.

The third motor 9 has a wheel 14 for guiding the extra length of the belt body 4 to meander in the vertical direction.
Of these, those arranged at appropriate positions are driven to rotate. Reference numeral 15 denotes a tension adjusting weight of the belt body 4.
The belt body 4 is, for example, one in which a transport path body 17 such as a net is bridged between two parallel link chains 16 as shown in FIG. The belt member 4 can be wound around each of the drums 2 and 3 because the transport path body 17 can expand and contract in the longitudinal direction and the link chains 16 can freely move in the longitudinal direction at the linking portions of the links. Curves can be run at times and other times.

The belt body 4 is connected to the ascending drum 2 and the descending drum 3 by guide rails 22 and 23 held via a support member 21 inside a cage frame 19 surrounding each of the drums 2 and 3. The winding is guided, and when one side edge in the width direction abuts on the outer peripheral surface of each of the drums 2 and 3, the feeding is driven by receiving the rotational force from the drum.

An induction motor is used for each of the first motor 7, the second motor 8, and the third motor 9. The rotation speeds of the motors 7, 8, 9 are set as follows. That is, the peripheral speed of the upward drum 2 by the first motor 7 is “V1”, the peripheral speed of the downward drum 3 by the second motor 8 is “V2”, and the surface speed of the belt body 4 by the third motor 9 is “V3”. When V1 is V
3 is increased by 3 to 8%, and V2 is increased by 8 to 12% of V3. When V1 is increased by 5% of V3 and V2 is increased by 10% of V3 (that is, V1: V2: V3
= 105: 110: 100), a particularly suitable result was obtained.

As described above, the peripheral speed V1 of the upward drum 2 and the peripheral speed V2 of the downward drum 3 are both the third motor 9
Is higher than the surface speed V3 of the belt body 4 fed by the
The overdrive control state, which causes a slight slippage around 3, will be maintained. Further, in the upward drum 2, the inclination direction of the belt body 4 is an upward gradient (the lead angle θ in FIG. 1).
), It is necessary to increase the winding force of the belt body 4. However, in the case of the downward drum 3, the inclination direction of the belt body 4 becomes a downward slope, and there is almost no need to consider the winding force. Accordingly, the peripheral speed V of the downward drum 4
The rotation of each of the motors 7 and 8 is controlled so that 2 is higher than the peripheral speed V1 of the ascending drum 3.
As a result, the belt 4 can be stably fed.

In such a state, if excessive tension is generated in the belt body 4 at, for example, a portion crossing between the upper portions of the ascending drum 2 and the descending drum 3, the drums 2 and Although the belt body 4 slides with respect to the belt body 3 and the stress is dispersed, even if the overtension of the belt body 4 is still not resolved, the rotation speed of the second motor 8 is reduced by receiving the tension of the belt body 4. The speed is automatically reduced to match the rotation speed of one motor 7.

If the tension of the belt body 4 is still insufficient, the rotation speed of the third motor 9 is automatically reduced to match the rotation speeds of the first motor 7 and the second motor 8. In this way, each motor 7, 8,
9 has a predetermined speed relationship, and the tension of the belt body 4 is appropriately maintained. Of course, when the tension acting on the belt body 4 returns to the normal state, the respective motors 7,
The rotation speeds of 8 and 9 are automatically returned to the original setting state.

The present invention is not limited to the above embodiment. For example, first to third motors 7, 8,
The relationship ratio of V1, V2, and V3 according to No. 9 is not limited to the above-described numerical values, but depends on the installation environment of the three-dimensional conveyor 1, the condition of the detailed components, the degree of wear, and the like. Can be appropriately combined within the allowable range of the above.

Such a combination is performed by visually controlling the tension of the belt body 4 between the ascending drum 2 and the descending drum 3 and controlling each of the motors 7, 8, and 9 by inverter control. Just do it. An induction motor may be used for at least two of the first to third motors 7, 8, and 9.

Including the structure of the belt body 4, the holding structure of the belt body 4, the path configuration of the belt body 4, the installation position and structure of the third motor 9, the number of installations, and the configuration of the upward drum 2 and the downward drum 3 ( The use of the present device and the like can be changed as appropriate.

[0023]

As is apparent from the above description, claim 1
According to the invention described above, the endless belt body, which spirally winds the outer surface of each of the upper drum and the lower drum between the upper and lower drums, is compared with the surface speed when the third motor feeds and drives the endless belt. The number of rotations of each motor is set so that the peripheral speed of the upward drum by the motor becomes higher, and the peripheral speed of the downward drum by the second motor becomes higher than this. Since the induction motor is used for at least two of them, the belt body is maintained in an appropriate overdrive control state in a normal state, and when an excessive tension is generated in the belt body, a predetermined or All the motors reduce their own rotation speed so that the belt body is maintained at a predetermined tension. As described above, the three-dimensional conveyor as a whole has an advantage that the control can be easily and accurately performed, and the structure is not complicated, the size is increased, and the equipment cost is not increased.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a three-dimensional conveyor according to the present invention.

FIG. 2 is an enlarged side view showing a part of an upward drum.

FIG. 3 is an enlarged view of a portion A in FIG. 2;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 solid conveyor 2 upward drum 3 downward drum 4 belt body 7 first motor 8 second motor 9 third motor

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B65G 43/00 B65G 15/02

Claims (1)

(57) [Claims] An upright drum (2) having a vertical cylindrical shape and a first motor (7) for rotating the same, and a lowering drum (3) having a vertical cylindrical shape and a second motor (8) for rotating the same. A three-dimensional conveyor having an endless belt body (4) and a third motor (9) for feeding the endless belt body, each of which spirally winds the outer surface thereof between the two drums (2, 3). The peripheral speed (V1) of the ascending drum (2) by the first motor (7) is higher than the surface speed (V3) of the belt body (4) by the motor (9). The number of revolutions of each motor (7, 8, 9) is set so that the peripheral speed (V2) of the descending drum (3) by the second motor (8) is higher than the peripheral speed (V1). , At least two of these motors (7,8,9) Using Deployment motor, the ascending
The peripheral speed (V1) of the drum (2)
3-8% increase in surface speed (V3)
The peripheral speed (V2) of (3) is the surface speed of the belt body (4).
(3) A three-dimensional conveyor, which is operated while being set to be increased by 8 to 12% of (V3) .