JP2598711Y2 - Linear motor type conveyor device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveyor device for high-speed conveyance using a linear motor.

[0002]

2. Description of the Related Art As shown in FIG. 1, a conventional roller conveyor device applies power to each roller 8 via a chain 9 or a belt when rotating the roller 8.

[0003] In this case, the change of the conveyor transport route is as follows.
It was very difficult and the transport speed was low, and only low-speed transport was possible.

[0004] However, the roller conveyor device does not require a special carriage, and can be conveyed by receiving the rotational force of the roller 8 only by placing the conveyed object on the roller 8, and is very inexpensive and effective. In any case, if there is a conveyed object in the conveying path, it is necessary to rotate the chain 9 or all the rollers connected by the belt. Therefore, a large power was required for the transported object.

A linear motor transfer device shown in FIG. 2 is known as a device capable of correcting such a defect and performing high-speed transfer. This device arranges a pair of rails 12 on a traveling path, and arranges a primary member 14 of a linear motor,
A truck 11 having wheels 13 placed on a pair of rails 12 is provided with a secondary member 15 of a linear motor, and the secondary member 15 is arranged close to a primary member 14. is there. Then, a moving magnetic field is generated in the primary member 14 and the carriage 11 is moved on the rail 12, so that the transported object 30 placed on the carriage 11 via the fixture 4 is moved.
Is being transported.

[0006]

The above-described conventional linear motor transfer device requires a special carriage 11 having an aluminum plate or a copper plate as a secondary conductor of the secondary member 15, and the transfer object 30. Had to be fixed on the carriage 11.

For this reason, a large amount of carts 11 are required to convey a large amount of articles, and even a small article 30 requires a considerable number of carts 11, which is very expensive together with waste of power.

Further, in the above linear motor transfer device,
As shown in Fig. 3, a return route is required to return the transported cart to its original position, and the linear motor is double (return).
And the traverse line 18 between the truck 17 and the return route 16, the occupied area of the space, and the refuge 22 for the truck are wasteful and expensive. In FIG. 3, reference numeral 19 denotes an unloading station, 2
Reference numeral 0 denotes a loading station, reference numeral 21 denotes a work station, and reference numeral 14 denotes a primary side member of a linear motor disposed along a traveling path.

[0009] On the other hand, the linear motor transfer device is expected to be super-accelerated and decelerated at a high speed compared with a general conveyor, and is expected to be transferred at a high speed. It is required to stop accurately at the work place (station), but to stop exactly at the fixed position,
It was extremely difficult, and had to rely on equipment such as an external positioning device such as an air cylinder. This required a time for unloading and stopping the transported material and a time for stopping and positioning, and had a serious problem in high-speed transport. That is, in FIG. 4, the positioning time T ₁ , the unloading time T ₂ , and the conveyed object fixing time T ₃ are wasted time, and the average conveying speed is reduced to the position shown in the figure.

In view of the above problems, the present invention has conceived of using the roller 10 itself as a secondary member of a linear motor as shown in FIG. That is, what is shown in FIG. 5 is a configuration in which the roller 10 of the roller conveyor is used as a secondary conductor as it is, and the roller 10 is rotated by the thrust of the primary side member 14 of the linear motor to convey the article 30. However, in practice, the secondary conductor surface receiving the magnetic field of the linear motor has a small number of secondary conductor surfaces, and a sufficient roller rotation torque cannot be obtained.

For this reason, improvements such as increasing the roller diameter and enlarging the secondary conductor surface have been made. However, as shown in FIG. 6, the conveyed object 30 collides with the roller surface and induces vibration and noise. However, smooth high-speed transport such as damage to the transported object 30 could not be obtained.

It is an object of the present invention to provide a linear motor type conveyor device which solves the above problems.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above object, a linear motor type conveyor device of the present invention has a primary side member of an induction type linear motor which is arranged along a conveyor traveling path, and has a plurality of linear members. A plurality of roller shafts whose axial directions are orthogonal to the conveyor traveling direction are provided at predetermined intervals along the roller direction, and are provided at predetermined intervals along the axial direction on each roller shaft, and the outer diameter thereof is A large number of cylindrical tops, which are sufficiently larger than the outer diameter of the roller shaft and are located close to the primary side member, and substantially along the entire outer peripheral surface of the top.
And the secondary side member of the induction type linear motor provided in a cylindrical shape, a magnetic field movement of the primary member of the inductive linear motor conveyor
An energizing device for detecting and controlling the occurrence of an object, wherein the axial positions of the pieces on adjacent roller shafts are shifted from each other, and the pieces are arranged so as to mesh without interfering with each other. It is characterized by.

In the above configuration, each frame is placed on the roller shaft.
Fixed, the roller shaft is rotatably supported by the support frame,
The secondary conductor is composed of at least two metals.
Inductive type with a roller shaft provided below the top
Roller shaft according to the moving magnetic field of the primary member of the linear motor
Each frame above rotates synchronously, or each frame on the roller shaft
The top is rotatably supported, and the number of
At least a two-layer structure made of two metals is used,
Of the primary side member of the induction type linear motor
Each frame on the roller axis rotates independently according to the moving magnetic field.
It is preferable to be constituted by either moving or moving.

Further, in the linear motor type conveyor device of the present invention, in addition to the above-described configuration, the conveyor traveling path is divided into blocks for each certain range, and a sensor is provided for each block. The sensor is installed at a position that covers a larger area than the range, and the sensor detects the presence or absence of the conveyed object in the assigned block, and if the sensor detects the conveyed object in the assigned block, the primary of the induction type linear motor in the assigned block When a conveyed object is conveyed by energizing the side member and the conveyed object is exhausted in the block, the energization is cut off. The power source for energizing the primary side member is controlled by a driver, and the driver turns on / off the power. It has one or more of the following functions: off, frequency, voltage change, and phase switching. Is determined, and means for controlling the speed and torque of the conveyed object for each block range by the rotational thrust of the frame are used, and the position and the conveyed speed of the conveyed object are detected by the output of the sensor for detecting the conveyed object in the block. It is characterized by having means for performing.

[0016]

According to the present invention, the following operations can be performed.

That is, in converting the thrust obtained by the moving magnetic field of the primary member of the induction type linear motor into the rotational force of the coma, the coma has a meshing structure as shown in FIG. And the size of the secondary member receiving the magnetic field of the primary member of the linear motor can be increased, so that an eddy current can be efficiently generated and a large torque can be generated.
In this configuration, the top rotates at high speed. Since the article is transported on the outer peripheral surface of the frame, high-speed transport is possible. Also,
By being arranged so that the pieces mesh with each other, the primary side member
Most of the moving magnetic field can be efficiently transmitted to the secondary member. You
That is, it is provided so that adjacent pieces mesh with each other without gaps.
And minimize the useless space where flux leaks.
can do. Here, there are few tops that make up the secondary conductor.
If it has a two-layer structure of at least two metals,
For example, a two-layer structure in which iron is covered with aluminum (or copper)
As a result, eddy currents induced on the aluminum surface
Large flux is applied to the iron material that is easy to pass through
Can generate force. And each frame is a roller
Is fixed on the shaft, and the roller shaft is rotatably supported by the support frame.
The secondary conductor is made of at least two metals.
Has a two-layer structure, and the roller shaft is one of the induction type linear motors.
If it rotates according to the moving magnetic field of the next member ,
For example, depending on the magnitude of the moving magnetic field, the moving speed or the moving direction, etc.
Each frame on the roller shaft rotates synchronously accordingly, so the roller shaft that forms the secondary conductor is equivalent to the fixed frame.
Only high inertia allows high-speed
A structure suitable for transportation can be provided. Meanwhile, the roller shaft
Each frame is rotatably supported on the top and forms a secondary conductor.
Each has a two-layer structure of at least two metals,
Responds to the moving magnetic field of the primary member of the induction type linear motor
As long as it rotates Te, for example, the traveling magnetic field size and transfer
Each frame on the roller shaft depends on the moving speed or moving direction.
Frames but since the rotating each independently, compared with the
The inertia of the top composing the secondary conductor requires only inertia
Ultra-high-speed transport of light-weight items due to the reduced size
A suitable structure can be provided.

In addition, the vibration of the conveyed article and the noise of the conveyed path, which are problems in the high-speed conveyance, are alternately adjacent to each other and mounted so as to mesh with each other. Therefore, there is little vibration to the conveyed object and noise in the conveying path, and there is no damage to the conveyed object at high speed.

Further, for example, by using the inverter output shown by the dotted line in FIG. 14 as the input power supply to the SSR of each block,
The transport speed of the entire transport path can be controlled by one inverter, so that the transport speed control can be obtained at very low cost.

That is, since only the block in which the object in the block is detected by the sensor is energized to the linear motor,
This is because a huge amount of power is not required.

Further, according to the above principle, a plurality of blocks are collected,
By dividing into larger units, a low-speed work line can be easily obtained, and it is possible to transport in the reverse direction with negative thrust (reverse phase) as well. Control is easily achieved.

Detects the conveyed object and turns on / off the linear motor.
By turning it off, there is no need to continue driving the drive source, there is no extra load on the bogie or the like, and an effect of labor saving that does not require excessive energy for the conveyed object can be obtained.

The speed and position of the conveyed goods, the power to the motor, the branching control of the conveyed path, etc., are controlled by sensor signals provided for each block, and the status of the conveyed goods is displayed on a display device. A branch control signal and a transport speed management signal can be easily obtained.

That is, the position of the block of the conveyed object can be grasped from the sensor signal, and the speed of the specific conveyed object can be easily sensed from the time for conveying the conveyed object between the blocks.

[0025]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

The linear motor type conveyor device of the present embodiment is provided with a primary side member 14 of an induction type linear motor M disposed along a conveyor traveling path T and at a predetermined interval along the conveyor traveling path T. And a plurality of roller shafts 8 whose axial directions are orthogonal to the traveling direction of the conveyor, and are provided on each of the roller shafts 8 at predetermined intervals along the axial direction. A large number of tops 3 which are sufficiently large and are located close to the primary side member 14, and the secondary side member 1 of the induction type linear motor M provided inside the top 3
And an energizing device D for controlling the generation of the magnetic field of the primary member 14 of the induction type linear motor M.

As shown in FIGS. 7 and 12, the positions of the tops 3 on the roller shafts 8 adjacent to each other are shifted from each other in the axial direction, and the tops 3 are arranged so as to mesh without interfering with each other. I have.

As shown in FIG. 9, the top 3 is a cylindrical iron plate 3 extending from the inside to the outside along the entire outer peripheral surface.
4. A three-layered cylindrical body in which a cylindrical aluminum plate (or a copper plate) 33 and a cylindrical friction material 32 having a high magnetic permeability are bonded, and reinforcing plates 50 and 50 are provided on both end surfaces. Have been. The aluminum plate 33 and the iron plate 34 constitute the secondary member 1 of the induction type linear motor M.

By placing the top 3 close to and above the primary member 14 of the linear motor M, the top 3 receives the moving magnetic field 38 of the linear motor M and moves to the aluminum plate 33 of the top 3 as shown in FIG. A thrust 37 is generated by the induced eddy current 36.

As shown in FIG. 8, the top 3 is rotatably supported by the roller shaft 8, and is driven by the thrust 37.
Rotates.

The external shape of the secondary-side member 1 is to be formed into a cylindrical shape as in this embodiment, as shown in FIG. 15, the outer polygonal
It can be formed into various shapes, such as being formed in a substantially cylindrical shape along the entire peripheral surface . In short, a structure that can obtain a thrust as the secondary member may be used. The friction member 32, the secondary
Adhered to the surface of the next member 1 and the transported object 30 is
Conveyance that suppresses slipping and applies to conveyed goods
What also serves as a cushioning material for absorbing shock and vibration at the time is desired.

As shown in FIGS. 7A and 7B, when the transported object 30 is placed on the top 3, the transported object 30 obtains a propulsive force in the rotation direction of the top 3 and the transported object 30 is directed in the direction opposite to the direction of the moving magnetic field 38. Go to Providing the friction member 32 on the outer peripheral surface of the top 3 is still more effective. The conveyed object 30 starts accelerating and finally rises to a speed equivalent to the frame rotation speed. Thereafter, it is conveyed at that speed at a high speed.

When the linear motor M is turned on / off, power is supplied only to the linear motor primary side member 14 in the range 39 while the sensor 40 provided on the traveling path T is off (FIG. 7C).

That is, two pairs of optical sensors 40 are provided for each block range 39, and if one of the optical axes is interrupted by a wired OR connection, the sensor signal is turned off. While the signal is off, the primary side member 14 of the linear motor M in the block is energized.

The sensor 40 is provided in front of the block, and detects the object 30 entering the block before the block, and rotates the frame 3 in advance so that the speed of the object 30 is not reduced. You need to keep it.

The sensor signals are monitored by an operation management device, and the status of the transported object 30 is displayed on a display device, and is used as a transport path branching control signal or a transport speed management signal.

That is, the block position of the transported object 30 can be grasped from the sensor signal, and the transport speed can be sensed from the transported time of the transported object between the blocks.

FIGS. 13 and 14 show an example of speed control for the transported object traveling pattern shown in FIG.

Up to the branch point 47, a commercial AC200V has an SSR (solid state relay) as a driver.
Driven by a three-phase power supply, the transported object 30 moves at high speed H, and the branched transport path 44 after branching is a transport path formed by a plurality of blocks each having an inverter as a driver, and the voltage of one inverter is controlled. This is a structure in which inverter power is supplied to the linear motor of each block via a driver of the SSR, and the speed is determined from the speed obtained from the transport time between blocks and the distance between unit blocks during transport on the main transport path 45. (Energy is E = m · V ² /
2 is applied to the square of the speed) and is applied to the primary member 14 of the linear motor M to decelerate the article 30.

It should be noted that rapid deceleration is also possible by applying a reverse-phase thrust. Generally, it is inexpensive to provide the top 3 with a load that increases the frictional resistance and does not easily rotate so that the transported object 30 does not stop, and assists deceleration.

After the deceleration, the conveyed object 30 receives the small thrust output from the inverter, and moves the curve shown in FIG.
To be transported. The curve uses conical tops 7 of different diameters used in a roller conveyor.

After passing through the control section 49, the vehicle stops at the stop position 48 after coasting.

When constant speed control of a work line or the like is required, a speed detecting coma roller 51 having no secondary conductor (secondary member) is provided, and the conveyed object 30 passing thereover is provided.
There is also a method of detecting the voltage level of the tachogen provided on the axis of the speed detection coma roller 51 for the transport speed of the roller (which can also be detected by the pulse frequency of the encoder), determining the constant speed, and performing feedback control.

The side guides 41 shown in FIG. 16 are provided on both sides of the traveling path T, and have a function of preventing derailment of the conveyed object 30 and a function of a branch guide 43 of an opening / closing mechanism 42 of a sorting / branching device. In response, the branch guide 43 performs line switching of the branch transport path 44 of the main transport path 45.

The switching timing of the opening / closing mechanism 42 is performed in accordance with an instruction from the operation management controller. The sensor 40 provided in each block uses the sensor 40 provided in each block to transfer the transported material between the blocks on the main transport path 45 based on the position information. The object 30 is monitored and the block sensor 4 in front of the branching device
The timing is set to 0 to control the opening and closing of a specific transported object.

It should be noted that the present invention is not limited to the above embodiment, and various modifications are possible based on the gist of the present invention, and these are not excluded from the scope of the present invention.

For example, in the above embodiment, each frame 3 is rotatably supported on the roller shaft 8, but each frame 3 is fixed on the roller shaft 8, and the roller shaft 8 is supported by the support frame 35 (FIG. 7).
(A)) It can be set as the structure supported rotatably.

[0048]

According to the present invention, it is possible to provide a linear motor type conveyor device which can obtain a large propulsive force, and can smoothly convey a conveyed material with low noise and high speed.

Further, according to the present invention, there is no need for a truck, so that there is no need for fixing, unloading, and station stop positioning time of a conveyed product, and there is an effect that the convey cycle time can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a conventional roller conveyor device.

FIG. 2 is a perspective view showing a conventional linear motor type transfer device.

FIG. 3 is a plan view showing the transport system.

FIG. 4 is a graph showing the running state.

FIG. 5 is a perspective view showing a linear motor type conveyor device prior to the present invention.

FIG. 6 is a side view showing the problem.

7 shows an embodiment of the present invention, wherein (a) is a plan view, (b) is a front view, and (c) is a graph.

FIG. 8 is a perspective view showing the top and a roller shaft.

FIG. 9 is an enlarged perspective view of a top.

FIG. 10 is a principle view showing the principle of rotation of a top.

FIG. 11 is a perspective view showing the principle of rotation of a top.

FIG. 12 is a plan view showing a meshing state of the tops.

FIG. 13 is a graph showing speed control.

FIG. 14 is a block diagram showing control means of the energizing device.

FIG. 15 is a perspective view showing another mode of the top.

FIG. 16 is a plan view showing a conveyor traveling path.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Secondary member 3 frame 8 Roller shaft 14 Primary member 30 Conveyed object 35 Support frame 40 Sensor M Induction linear motor T Conveyor path D Current supply device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ identification code FI H02P 7/00 101 H02P 7/00 101A (58) Fields investigated (Int.Cl. ⁶ , DB name) B65G 54/02 B65G 13 / 06 B65G 39/04 H02K 41/02 H02K 41/025 H02P 7/00 101

Claims (4)

(57) [Scope of request for utility model registration] A primary member of claim 1 induction type linear motor which is arranged a number along the conveyor travel path, disposed at predetermined intervals along the conveyor travel path, the axial direction is perpendicular to the conveyor running direction A large number of roller shafts, provided at predetermined intervals on each roller shaft along the axial direction, the outer diameter of which is sufficiently larger than the outer diameter of the roller shaft;
A large number of columnar tops located close to the primary side member; and a secondary side member of an induction type linear motor provided in a substantially cylindrical shape along the entire outer peripheral surface of the top, the conveyed a magnetic field movement of the primary member of the inductive linear motor
And an energizing device for detecting and controlling the occurrence of the shift. The axial positions of the tops on adjacent roller shafts are shifted from each other, and the tops are arranged so as to mesh without interfering with each other. Linear motor type conveyor device. 2. A frame, wherein each frame is fixed on a roller shaft, and the roller shaft is rotatably supported by a support frame to form a secondary conductor.
Has a two-layer structure of at least two metals,
Of an induction type linear motor with
The linear motor-type conveyor device according to claim 1, wherein the conveyor device rotates according to a moving magnetic field of the next member . 3. Each of the tops is rotatably supported on a roller shaft, and the top constituting a secondary conductor is made of at least two kinds of metals.
It has a two-layer structure, and each piece is guided below
Type linear motor rotates according to the moving magnetic field of the primary member.
Linear motor conveyor apparatus according to claim 1, wherein that. 4. The conveyor traveling path is divided into blocks for each range, a sensor is provided for each block, and the sensor is installed near the block range or at a position covering a range larger than the range. The presence / absence of a conveyed object in the assigned block is detected, and when the sensor detects the conveyed object in the assigned block, the primary side member of the induction type linear motor in the assigned block is energized and the conveyed object is transported and conveyed into the block. The power supply to the primary side member is controlled by a driver when there is no object, and the driver turns on / off the power, changes the frequency and voltage, or switches the phase, Alternatively, it has a plurality of functions, and the rotational thrust and the rotation direction of the frame are determined by the output of the driver, and the speed and the speed of the conveyed object are determined by the rotational thrust of the frame. And means for controlling the position of the conveyed object and the speed of the conveyed object based on the output of a sensor for detecting the conveyed object in the block. 3. The linear motor-type conveyor device according to 3.