JPS6225565B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an anti-bias device for a conveyor whose belt shape becomes cylindrical or U-shaped during transport of objects.

A conventional, for example, cylindrical conveyor is shown schematically in side view in Fig. 1, in plan view in Fig. 2, and in Fig. 3.
As shown in the cross section, it consists of an endless belt 1, a head pulley 2 on the driving side, and a tail pulley 3 on the driven side.The belt shape is flat in each pulley 2 and 3, and cylindrical in shape between them. The space between the flat and cylindrical shapes is transformed into a U shape. The circumference of the cylindrical portion is restrained by a plurality of guide rollers 4, which are provided at a plurality of locations along the transport object traveling direction a and the return side traveling direction b of the conveyor. Transport item 5
is accepted near code c of tail pulley 3,
It is discharged from the head pulley 2.

The guide roller 4 that restrains the cylindrical portion of the belt 1 is fixed to the conveyor frame, so its position will not change, and when the cylindrical portion is in a normal body position, the center point P of the bottom of the belt is at the bottom. It is located at a position that almost coincides with the center of the guide roller 4 (4th
figure). The conveyor itself is adjusted and installed so that it is in this initial position, but as the conveyor is operated, the condition of the transported goods 5 inside,
The belt 1 may be gradually displaced due to differences in tension between various parts of the belt (see Figures 4b and 4c).
(see figure). In this specification, this state will be referred to as bias. If this deviation continues, the cylinder will become twisted.

Various measures have been devised to prevent the above-mentioned deviation in conventional conveyors, but all of them are basically based on the frictional force between the guide roller and the belt. However, since the guide roller must rotate, it is not possible to apply a force large enough to prevent the belt from being biased, and it is even more difficult to adjust the bias.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an unbalance prevention device that monitors the unbalance of the belt and adjusts the belt to a normal state if it is found to be unbalanced.

Preferred embodiments of the present invention illustrated in FIGS. 5 to 16 will be described in detail below.

FIG. 5 shows the arrangement of the components of the apparatus of the present invention, in which a set of a rotating magnetic field device 6 for bias adjustment and a bias detector 7 is installed at one or more locations with appropriate intervals.

As shown in Fig. 6, which shows a cross section of the cylindrical conveyor belt 1, and Fig. 7, which shows an enlarged view of its main parts, the belt 1 has three steel wires near its bottom center point. A rope 8 and a secondary conductor 9 are buried. FIG. 8 is a perspective view of the bottom of the belt 1, and shows an example in which a plate-shaped secondary conductor 9 is used. This secondary conductor 9 is selected from a non-magnetic material, a good electrical conductor, and a flexible material; for example, one or more thin copper plates stacked one on top of the other is used. This secondary conductor 9 is buried over the entire length of the belt 1 at a constant interval D ₄ .

The wire rope 8 is buried and connected over the entire length of the belt 1. It is known that the wire rope 8 is buried in the belt for the purpose of increasing the tensile strength of the belt 1, but in the present invention, although it has an important effect of increasing the tensile strength of the belt, the main purpose thereof is to increase the tensile strength of the belt. However, by expanding the magnetic flux generated by the rotating magnetic field device 6 for bias adjustment,
The purpose is to increase the amount of magnetic flux that crosses the secondary conductor 9. In this embodiment, three wire ropes are used, but this is for convenience of explanation and illustration, and the present invention is not limited to this.

In addition, the distance D ₅ between the wire ropes 8 and the secondary conductor 9
The size D ₁ ×D ₂ , the distance D ₄ between the secondary conductors 9, the materials of the wire rope 8 and the secondary conductors 9, etc. are determined by the thickness of the belt 1 and the effectiveness of the rotating magnetic field in the rotating magnetic field device 6 for adjusting bias. It is determined by the length (see Figure 13), the pole pitch, the force applied to the secondary conductor, etc.

Further, if necessary, a plurality of sets of three wire ropes 8 and a secondary conductor 9 may be provided in the conveyor belt 1 as shown in FIG. 9.

In the embodiment shown in FIG. 8, the secondary conductor 9 is composed of one or more stacked plates. As shown, through holes 10 can be provided in the secondary conductor plate with an appropriate size, an appropriate interval, and an appropriate number, avoiding the area under the wire rope 8.

Furthermore, an example in which the secondary conductor 9 is composed of a plurality of wires is shown in FIGS. 11a and 11b. This linear secondary conductor 9 is three-dimensionally parallel to the wire rope 8, and each wire end is electrically connected. The linear secondary conductors 9 are also embedded at regular intervals over the entire length of the belt, and are made of a non-magnetic material, a good electrical conductor, and a flexible material.

Furthermore, the wire parallel to the wire rope of the linear secondary conductor shown in FIG. 11a can be made into a coil shape. The coiled secondary conductor has better adaptability to belt curvature, improves adhesion and fixation to the belt, and improves electromagnetic effects. This coil may have a single or multiple turns.

It should be noted that whether the secondary conductor is plate-shaped or linear is selected depending on the case, but in any case, the basic condition is that it be perpendicular to the magnetic flux generated by the rotating magnetic field device 6 for bias adjustment. In principle, it has the same function as the rotor winding of a squirrel cage induction motor.

FIG. 12a shows a cross section of the rotating magnetic field device 6 for bias adjustment, and FIG. 12b shows a plane thereof. This rotating magnetic field device 6 for bias adjustment includes a yoke 12 and a coil 1.
3. It is composed of a core 14, a coil retaining wedge 15, and a power supply terminal 16, and its function is to reduce the end effect on a concave arc surface of a certain appropriate length on the stator side of an induction motor. The three-phase winding is electrically complete, and it is possible to generate a rotating magnetic field in the direction of arrow d, and by swapping the phases of the power supply, it can be generated in the opposite direction e.
It can also be changed to Also, it is similar to a three-phase induction motor in that the number of magnetic fluxes crossing the secondary conductor can be changed by changing the current, and the speed of the rotating magnetic field can be changed by changing the power supply frequency.

FIG. 13 shows the positional relationship between the cylindrical belt 1 and the rotating magnetic field device 6 for adjusting bias.
A dedicated guide roller 17 keeps the gap between the two constant.

In this way, the rotating magnetic field device 6 for bias adjustment and the belt 1 have the same function as a squirrel cage three-phase induction motor, but if they are made to correspond, the primary side corresponds to the rotating magnetic field device 6 itself for bias adjustment. On the secondary side, the wire rope 8 corresponds to the rotor core, and the secondary conductor 9 corresponds to the rotor bar. Therefore, the conveyor belt 1 is moved by a force in the direction of the magnetic flux of the rotating magnetic field device 6. That is, magnetic flux is generated by the eddy current generated in the secondary conductor 9, and this and the magnetic flux of the rotating magnetic field interact to produce a force, and the wire rope 8 also receives a force from the magnetic flux of the rotating magnetic field. Since the wire rope 8 and the secondary conductor 9 are embedded in the belt 1, the result is that the belt 1 is subjected to a rotational force perpendicular to the direction of belt travel.

FIG. 14a shows a cross section of the bias detector 7, and FIG. 14b shows its plane. The deviation detector 7 is composed of a left side detection coil 18 _L and a right side detection coil 18 _R , and a gap with the belt 1 is kept constant by a guide roller 19.

The left and right detection coils 18 _L and 18 _R act to be sensitive only to magnetic materials. Therefore, it is sensitive to the steel wire rope 8 but not to the secondary conductor 9.

As shown in FIG. 15a, when the belt 1 is operating in the normal position, each detection coil 1
Wire ropes 8 _L , 8 _C , 8 corresponding to 8 _L , 18 _R
Since the position of _R is symmetrical, the responsive outputs from the bias detection coils 18 _L and 18 _R are the same. 1st
5b and 15c, when the belt 1 is biased to either the left or right side, the respective detection coils 18
Since the relative positions of _L , _18R and the wire ropes _8L , _8C , _8R differ, the sensitive outputs from the respective detection coils also differ. By detecting this difference, it is possible to detect to what side the belt 1 is biased. Therefore, by controlling the magnitude of the voltage applied to the rotating magnetic field device 6 and the direction of the rotating magnetic field based on the detection signal, the deviation of the belt can be adjusted to return to the normal position.

FIG. 16 shows an example in which the deviation prevention device according to the present invention is applied to a U-shaped conveyor using a belt, and particularly shows the belt placed on a rotating magnetic field device for adjusting deviation.

In the case of a U-shaped conveyor, the only difference from the cylindrical conveyor is that the top surface is open, and the functions and effects are the same.

Although the present invention has been described above with respect to a horizontal conveyor, it can also be applied to inclined or vertical conveyors. Furthermore, when the conveyor is made to advance in a curved manner, in some places it may be better to consciously tilt the conveyor itself to a certain extent. Even in this case, according to the device of the present invention, it is possible to partially forcibly cause bias by utilizing not only the original bias prevention function but also the bias adjustment function.

Although not shown, it is a matter of course that a rotating magnetic field control device, a detector amplifier, etc. are associated with the bias adjusting rotating magnetic field device 6 and bias detector 7 arranged as shown in FIG.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of the cylindrical conveyor, Fig. 2 is a schematic plan view of the cylindrical conveyor shown in Fig. 1,
Figure 3 is a - arrow view of Figure 1, Figure 4a, and Figure 4.
Figures b and 4c are cross-sectional views for explaining the biased state of the conveyor belt, Figure 5 is a side view of a cylindrical conveyor showing the arrangement of the device according to the present invention, and Figure 6 is a cylindrical conveyor. 7 is a sectional view of the main part of FIG. 6, FIG. 8 is a perspective view of the bottom of the conveyor belt, FIG. 9 is a sectional view showing another embodiment of the conveyor belt, and FIG. 10 is a sectional view of the conveyor belt. A diagram showing another embodiment of a secondary conductor embedded in a belt,
Figures 11a and 11b are bottom perspective views and cross-sectional views of yet another embodiment of the conveyor belt;
Figures 12a and 12b are side views and plan views of the rotating magnetic field device for bias adjustment, Figure 13 is a diagram showing the positional relationship between the belt and the rotating magnetic field device, and Figure 14a is a diagram showing the positional relationship between the belt and the rotating magnetic field device.
Figures 14b and 14b are side and top views of the bias detector, Figures 15a, 15b and 15c.
The figure is a diagram to explain the detection method of the bias detector,
FIG. 16 is a diagram showing an example in which the device of the present invention is applied to a U-shaped conveyor. DESCRIPTION OF SYMBOLS 1... Belt, 2... Head pulley, 3... Tail pulley, 4... Guide roller, 5... Transport object, 6... Rotating magnetic field device for bias adjustment, 7... Deviation detector, 8... Wire rope, 9... Secondary conductor, 10... Through hole, 12...
Yoke, 13... Coil, 14... Core, 15... Coil retaining wedge, 16... Power supply terminal, 17... Guide roller, 18... Detection coil, 19... Guide roller.

Claims (1)

[Claims] 1. A plurality of magnetic wire ropes buried in parallel over the entire length of the belt of a cylindrical or U-shaped conveyor, and a wire rope located outside the wire rope in the radial direction of the belt. A plurality of non-magnetic and electrically good secondary conductors are buried in the belt at appropriate intervals along its entire length in correspondence with the rope, and the magnetic flux generating surface is cylindrical or U-shaped. A device having a concave circular arc surface corresponding to the outer circular arc surface of the belt in the vicinity of the wire rope and the secondary conductor buried therein and generating a reversible rotating magnetic field along the circumferential direction of the circular arc surface; and a device for detecting deviation in the circumferential direction of the belt of the wire rope buried in parallel and having a corresponding concave arc surface, and detecting deviation of the belt by this detection device and detecting the deviation. A device for preventing deviation of a cylindrical or U-shaped conveyor, characterized in that the rotating magnetic field generating device is controlled to generate a rotating magnetic field in the opposite direction. 2. The device according to claim 1, wherein the secondary conductor is a plate-shaped conductor. 3. The device according to claim 2, wherein the plate-shaped secondary conductor has a through hole in a portion that does not overlap with the wire rope. 4. The device according to claim 1, wherein the secondary conductor is comprised of a plurality of parallel conductor strands with both ends short-circuited. 5. The device according to claim 4, wherein the conductor wire of the secondary conductor is coiled. 6. The device according to claim 1, wherein the bias detection device comprises two detection coils arranged in parallel in the circumferential direction of the concave arc surface. 7. The device according to claim 1, wherein a plurality of pairs of a plurality of the wire ropes and a plurality of the secondary conductors arranged in a straight line are embedded in the belt.