JPH09202426A - Three dimensional conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply a specified tensile force to a belt body, and keep it constant in a three dimensional conveyor having an upward traveling drum and a downward traveling drum, and an endless belt body laid over both the drums to spirally winding the outer surfaces of the drums. SOLUTION: Motors 7, 8 for rotating drums 2, 3, and a feed motor 9 for a belt body are modified into induction motors, the peripheral speed of the upward traveling drum 2 is increased the speeded more than the surface speed of the belt body 4, and the peripheral speed of the downward traveling drum 3 is further speeded up more than the peripheral speed of the upward traveling drum 2. Thus, even when the tensile force applied to the belt body 4 is changed, the optimum rotating state in the respective motors 7, 8, 9 can be automatically obtained.

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 its control method.

[0002]

2. Description of the Related Art Conventionally, there has been known a three-dimensional conveyor in which an endless belt member is spirally wound around a rotatable drum having a vertical cylindrical shape and the belt member is circulated and run. This three-dimensional conveyor is mainly used to reduce the occupied space when it is necessary to maintain a conveyed product for a long time, such as when food is subjected to treatments such as freezing, drying, and heating. It is a thing.

In this three-dimensional conveyor, the diameter and height of the drum are made compact, the loading port and the loading port of the conveyed object are both upper and lower, and the conveyed object is subjected to a plurality of treatments around the drum. In order to meet demands such as usage, there is a structure (twin system) that is equipped with two drums, one for going up and the other for going down.

This twin type three-dimensional conveyor is equipped with a mechanical power distribution device for rotating two drums and feeding a belt body by the power taken out from a large capacity motor via a gear mechanism or the like. It is normal to have
One equipped with a power distribution device that performs rotation of each drum and feeding of the belt body by three independent servo motors and the like, and feedback-controls each rotation speed by a computer (see Japanese Patent Laid-Open No. 270636/1993). Is also known.

[0005]

In the above mechanical power distribution device, not only is the structure complicated and large in size, and there are many power transmission losses, but when adjusting the tension of the belt body, the gears and the like to be used are replaced each time. Therefore, there is a defect that handling is extremely troublesome. Especially, if the tension of the belt changes during operation, it cannot be dealt with,
The belt body may be over-tightened or loosened by the belt body, and in the worst case, the belt body may be broken at a portion across 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 and the tension of the belt body, which makes the device large in size and complicated and difficult to control. It had various drawbacks that it was likely to contain a large amount. In the three-dimensional conveyor, since the fluctuation of the tension of the belt body during operation is absorbed, the peripheral speed of the drum is made higher than the surface speed of the belt body so that the belt body slightly slips on the outer peripheral surface of the drum. It is in a state (this is called overdrive control).

The above-described computer power distribution device has been proposed to enable such overdrive control, which was not possible with the mechanical power distribution device. Since it easily changes due to various factors such as the degree of wear on the body or the elongation of the belt body, for example, when overdamping of the drum by the belt body is detected, it is rather loosened too much by controlling the speed. On the contrary, when it is detected that it is too loose, it may be overtightened, and if this happens alternately, it may cause an endless crimp phenomenon in the belt body, and good results are obtained. I couldn't do it.

The present invention has been made in view of the above circumstances, and in maintaining the tension of the belt body at a predetermined constant value, the control can be easily and accurately performed, and the structure is complicated.
It is an object of the present invention to provide a three-dimensional conveyor that does not cause an increase in size and a rise in equipment costs.

[0009]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is, according to the first aspect of the present invention, the up-and-falling drum in the form of a vertical cylinder and the first motor for rotating the same, the down-and-up drum in the vertical cylinder and the second motor for rotating the same are provided between the two drums. In a three-dimensional conveyor having an endless belt body and a third motor for feeding the endless belt body, each of which has an outer surface wound in a spiral shape, an upward drum driven by the first motor rather than a surface speed of the belt body driven by the third motor. The rotational speed of each motor is set so that the peripheral speed of the second motor is higher than the peripheral speed of the upward drum, and at least two of these motors are set. Using an induction motor for two things,
It is characterized by driving without feedback control.

The speed difference between the first to third motors is
It is possible to maintain the state in which the belt body slips (overdrive control state) with respect to the upward drum and the downward drum. The speed difference between the surface speed of the belt body and the peripheral speed of the ascending drum at this time takes into consideration that the belt body wound around the ascending drum has a lead angle inclined upward in the horizontal plane. It is said that the speed has been increased somewhat more than the speed.

Further, in the upward-going drum, the belt body is inclined in an upward direction, so that it is necessary to apply a winding force to the belt body, but in the downward-direction drum, the belt body is inclined in a downward direction. Since the winding force hardly needs to be taken into consideration, 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 makes it possible to allow the rotation speed of the motor itself to decrease when excessive tension is generated 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 which is an embodiment of the present invention.
It has a rotatable upbound drum 2 and a downbound drum 3 in the form of a vertical cylinder, and an endless belt body 4 in which the outer surfaces of both drums 2 and 3 are spirally wound.

A first motor 7 for rotating the lower going drum 2 is provided at the lower part of the upper going drum 2, and a second motor 8 for rotating the lower going drum 3 is provided at the lower part thereof. The belt body 4 extending between the lower portions of the drums 2 and 3 is provided with a third motor 9 for feeding the belt body 4. As shown in FIGS. 2 and 3, the first motor 7 and the second motor 8 are provided with a pinion 12, which can be rotationally driven through a speed reducer (not shown), and the like. It is adapted to mesh with an internal spiral gear 13 provided on the lower inner peripheral portion of the.

Further, the third motor 9 guides the wheel 14 which causes the extra length portion of the belt body 4 to meander in the vertical direction.
Among them, the one arranged in the proper position is driven to rotate. Reference numeral 15 is a weight for adjusting the tension of the belt body 4.
The belt body 4 is, for example, one in which a conveying path body 17 such as a net is spanned between two parallel link chains 16 as shown in FIG. Since the transport path body 17 can be expanded and contracted in the longitudinal direction, and the link chains 16 can freely move in the longitudinal direction at the connecting portions of the links, the belt body 4 is wound around the drums 2 and 3. It is possible to run in curves at other times and other times.

The belt body 4 is guided to the up-going drum 2 and the down-going drum 3 by guide rails 22 and 23 held via a supporting member 21 inside a cage frame 19 surrounding the drums 2 and 3. The winding is guided, and when one side edge in the width direction comes into contact with the outer peripheral surfaces of the drums 2 and 3, the winding force is also received from the drums 2 and 3 to be driven and driven.

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 and 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% from 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), particularly preferable results are obtained.

Thus, 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
Since it is faster than the surface speed V3 of the belt body 4 sent by the
It will be maintained in the overdrive control state that causes a slight slip around 3. Further, in the upward drum 2, the inclination direction of the belt body 4 is an upward slope (in FIG. 1, the lead angle θ
Since it is necessary to increase the winding force of the belt body 4, it is necessary to increase the winding force of the belt body 4, but in the downward drum 3, the inclination direction of the belt body 4 becomes a downward slope, and it is not necessary to consider the winding force. Accordingly, the peripheral speed V of the downward drum 4
The motors 7 and 8 are rotationally controlled such that the motor speed 2 is higher than the peripheral speed V1 of the drum 3.
As a result, the belt body 4 can be stably fed.

In such a state, for example, when an excessive tension is generated in the belt body 4 at a portion across the upper portions of the upward going drum 2 and the downward going drum 3, for example, initially, the respective drums 2, The slip of the belt body 4 with respect to 3 is induced to disperse the stress. However, if the overtension of the belt body 4 is still not resolved by this, the tension of the belt body 4 is applied and the rotation speed of the second motor 8 becomes 1 The motor is automatically decelerated to match the rotation speed of the motor 7.

When the tension of the belt body 4 is not sufficiently absorbed, 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,
The rotation speed of 9 has a predetermined speed relationship, and the tension of the belt body 4 is appropriately maintained. Of course, if the tension acting on the belt body 4 is returned to the normal state, the tension of the belt body 4 is kept in a predetermined state and the motors 7,
The number of revolutions of 8 and 9 will be automatically returned to the original setting state.

By the way, the present invention is not limited to the above embodiment. For example, the first to third motors 7, 8,
The relational ratio of V1, V2, V3 according to 9 is not limited to the above-mentioned numerical values, but it is possible to use the individual ratios of V1, V2, V3 depending on the installation environment of the three-dimensional conveyor 1, the condition of the detailed constituent members and the like or the degree of wear. Can be appropriately combined within the permissible range.

Such a combination is performed by visually observing the tension of the belt body 4 passing between the up-going drum 2 and the down-going drum 3 and controlling the respective motors 7, 8 and 9 with an inverter. I'll do it. The induction motor may be used only for at least two of the first to third motors 7, 8, 9.

The structure of the belt body 4, the holding structure of the belt body 4, the route structure of the belt body 4, the installation position and structure of the third motor 9, the number of installations, the configuration of the upward going drum 2 and the downward going drum 3 ( The rotating device and the like), the use of this device, and the like can be appropriately changed.

[0023]

As is apparent from the above description, claim 1
According to the present invention described above, the endless belt body, which winds the outer surface of the up-going drum and the outer surface of the down-going drum, is wound around the outer surfaces thereof in a spiral shape, as compared with the surface speed at the time of being driven by the third motor. The rotation speed 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 that. Since the induction motor is used for at least two of them, the belt body can be 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 the number of rotations of their own so that the belt body is held at a predetermined tension. As described above, the three-dimensional conveyor as a whole has the advantages that it can be controlled easily and accurately and that the structure is not complicated, the size is large, and the equipment cost is not high.

[Brief description of drawings]

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

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

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

[Explanation of symbols]

 1 3D Conveyor 2 Upward Drum 3 Downward Drum 4 Belt Body 7 First Motor 8 Second Motor 9 Third Motor

Claims (1)

[Claims] 1. A standing cylinder-shaped upward going drum (2) and a rotating first motor (7) thereof, and a standing cylindrical downward going drum (3) and a rotating second motor (8) thereof. , A three-dimensional conveyor having an endless belt body (4) spirally winding the outer surfaces of both drums (2, 3) and a third motor (9) for feeding the endless belt body. The peripheral speed (V1) of the upward drum (2) by the first motor (7) becomes higher than the surface speed (V3) of the belt body (4) by the motor (9), and the upward speed of the upward drum (2) is increased. The rotation speed of each motor (7, 8, 9) is set so that the peripheral speed (V2) of the downward drum (3) by the second motor (8) is higher than the peripheral speed (V1). , Induct to at least two of these motors (7, 8, 9) A three-dimensional conveyor characterized by being operated without feedback control using a motion motor.