JPH048156A - Thrust augmenter at start of linear motor - Google Patents

Abstract

PURPOSE:To utilize thrust of a linear motor effectively by regulating the position of a stator with respect to a reaction plate such that they approach to each other at the time of starting whereas a predetermined interval is maintained at the time of running. CONSTITUTION:A reaction plate 31 is arranged vertically along the running direction in the center at the lower section of a truck body 30 in the lower unit 3B of a carrying truck 3, and the stator 6 of a linear motor is arranged on the frame of a travel path. One or two guide rods 61, 61 are projected from the back face of the stator 6 and slidably inserted into guides 62 provided at the frame side, and the rod 64 of a movable unit 63 such as a cylinder or a motor cylinder is secured to the frame. The movable unit 63 operates the stator 6 retractably, i.e., regulates the position of the stator 6 with respect to the reaction plate 31.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a linear motor for a transport vehicle that travels along a predetermined travel path and transports articles, when the vehicle is started.
A movable device was used to move the stator as close as possible to the reaction plate side to improve thrust, and the same linear motor was used to increase the thrust when starting the bogie compared to when it was running, making it easier to start. It is related to the device.

[Conventional technology]

Conventionally, in a device that sorts items such as parcels and letters into their destinations and other areas, an endless conveyor line is installed, a supply line and a sorting line are installed at arbitrary points on this conveyor line, and a large number of The tray truck is connected to a chain conveyor, and the tray truck is run. Therefore, the driving of the chain conveyor generates a lot of noise, and the structure is complicated.

For this reason, methods of driving the tray cart with a linear motor are proposed, for example, in Japanese Patent Application Laid-open Nos. 57-137218 and 60-41584.
No. 63-165218.

[Problem to be solved by the invention]

When driving a transport trolley with a linear motor, the stator of the linear motor is fixed in a fixed position, and a rear axis plate installed vertically on the lower surface of the trolley runs between the opposing stators without contacting the stator. The thrust is applied to the reaction plate. However, when this transport vehicle travels along a travel path, the tilting of the vehicle also acts on the reaction plate due to the inclination of the travel path, vibrations multiplied by the load, and the like.

For this reason, conventionally, the interval between the opposing stators is determined so that even if the reaction plate tilts following the tilting of the truck, it does not come into contact with the stator. Therefore, the gap between the stator and the rear axis plate is determined so that the gap is larger than that at which the reaction plate runs in a normal state, that is, so as to maintain non-contact within the allowable tilting angle of the reaction plate.

For this reason, the gap between the stator and the reaction plate is sized to account for the fluctuation of the reaction plate, so only a thrust lower than the maximum thrust of the linear motor can be used effectively, and especially at startup, a large amount of power is required compared to normal running. Therefore, it may be necessary to use a motor with a larger capacity than necessary.

An object of the present invention is to make the position of the stator relative to the reaction plate variable depending on the traveling state of the truck and at the time of starting, so as to effectively utilize the maximum thrust of the linear motor at the time of starting.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention has achieved C: A plurality of sorting vehicles are connected to each other on a loop-shaped traveling path equipped with a chute, and a plurality of transport vehicles each having a tiltable pan are connected to each other.
In a device in which the trolley is driven by a linear motor, the stator of the linear motor that provides thrust to the reaction grate that is vertically installed on the lower surface of the carrier is attached to the running path frame via a movable device, and The gist of the present invention is to control the movable device so that the stator is brought close to the reaction grate at startup, and after the truck starts running, the stator is returned to a set position and fixed.

[For production]

b A reaction plate is installed vertically on the underside of the transport vehicle, and a stator of the linear motor is placed on the traveling path side, and this stator can be adjusted by moving it toward or away from the reaction plate side according to the resistance value of the linear motor. Since a movable device is provided in the linear motor, the linear motor startup stator is brought as close as possible to the reaction plate side to improve thrust.

Since the reaction plate does not vibrate when the transport vehicle is started, the stator will not come into contact with the reaction plate even if the stator is brought close to the stator. When the vehicle starts running, the stator is moved back to a fixed position, and a maximum allowable gap is created between the stator and the reaction plate to prevent the running reaction plate from coming into contact with the stator, thereby ensuring safe running. This allows the thrust of the linear motor to be utilized as effectively as possible.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention, a device for increasing the thrust when starting a linear motor, will be explained based on an embodiment of an article sorting device having a running path as shown in the drawings.

The traveling path 1 is formed into a loop shape, the intermediate portions are overlapped one above the other, the traveling path is inclined at both end loop portions, and the articles are loaded onto the transport vehicle at a predetermined position on the lower side of the loop-shaped traveling path, and the goods are loaded onto the transport vehicle at a predetermined position on the lower side of the loop-shaped traveling path, and then A large number of sorting chutes 2a, 2b, . On a part of the straight path IZ or the curved path IX, transfer conveyors 4a, 4b, etc.
1 to 2 or more are arranged, and a plurality of transport vehicles 3. All transport vehicles run simultaneously. This transport vehicle 3
The traveling is performed by several linear motors 6 arranged at appropriate intervals at one end of the traveling path 1, for example, at the end opposite to the transfer conveyor. A large number of transport vehicles placed on a road 1 are simultaneously transported. The stator of this linear motor 6 can be installed at any position on the running path. In addition, the straight path I
Two or three units can be installed at the end of Z, and two or three units can be installed at the end of the upper straight path IY to provide further thrust to the bogie that has ascended this curved path. As a result, several linear motors 6 are disposed at the upper and lower ends of the straight road near one of the curved roads, and maintenance can be easily performed.

By distributing and arranging the linear motors in several units in this way, it is possible to reduce the tension in the pan connection part, making the structure of the pan connection part smaller and lighter, and distributing the tension. , there is an advantage that the capacity of the linear motor can be reduced.

Note that the traveling speed and braking of the transport vehicle are controlled by this linear motor 6.

In addition, in order to more efficiently drive the transport vehicle with this linear motor 6, the linear motors 6 are arranged so as to face both sides of the reaction plate 31, which is vertically installed on the lower surface of the transport vehicle 3, as shown in the figure. The stators of the two linear motors 6 are fixed to the frame of the running path 1 so as to simultaneously apply thrust from both sides of the reaction plate 31.

The transport vehicle 3 is shown in FIG. This transport vehicle 3 is divided into an upper unit 3A that mainly performs loading and unloading, and a lower unit 3B that mainly performs traveling and connection between the vehicles.The upper unit 3A can be used by connecting any unit to the lower unit 3B. In this way, the lower unit 3B is made compatible. By making the lower unit 3B common and making the shape of the upper unit 3A according to the type of article, it is possible to sort various articles. The lower unit 3B of the transport trolley 3 has a reaction plate 31 vertically disposed at the center of the lower part of a trolley body 30 having a predetermined size along the running direction of the trolley, and has a reaction plate 31 hanging from the front side of the trolley main body 30 in the running direction. Wheels 32.3 on both sides
The wheel 32 and the horizontal roller 33 are rotatably supported on the same rail I.
Support it at R. That is, the wheels 32 are in contact with the top surface of the rail IR and can run while supporting the entire load applied to the lower unit and the upper unit, and the horizontal rollers 33 are in contact with the inner surface of the rail IR, so that when the bogie is running or stopped, It supports the overturning moment applied to the cart and stably maintains the transport cart in a predetermined posture.

Furthermore, a connecting tool 34 such as a ball joint is provided protruding from the front central portion of the truck body 30, and a connecting tool 34 is provided protruding from the center of the rear side of the truck main body 30 adjacent to the front. The front and rear truck bodies 30 and 30 are connected to each other so that they can be bent vertically and horizontally within a permissible angle.

The upper unit 3A has a required size and shape, and is provided with a pan 36 supported by a pan support bracket 35 on the upper part so as to be swingable and tiltable. The pan 36 may be V-shaped or otherwise shaped to ensure reliable transfer of articles. bread 3
A pan tilting device 37 is disposed on the back side of both side plates 6.

In addition, the stator 6 of the linear motor installed on the frame F of the running path has - or two guide rods 61.6 on its back side.
1 is provided protrudingly, and this guide rod 61.61 is slidably supported through a guide 62 provided on the frame side, and a rod 64 of a movable device 63 such as a cylinder or an electric cylinder fixed to the frame is fixed. This movable device 63
With this operation, the stator 6 can be adjusted to move in and out, that is, to move toward and away from the reaction plate. In this case, the stroke of the movable device 63 is determined so that the protruding position of the rod is as close as possible to the reaction plate so that the maximum thrust before starting the linear motor acts on the reaction plate. It is designed to have a safe gap so that it does not come into contact with the stator even when running. Even if the stator moves in and out by operating this movable device, the guide rod is used so that the stator moves uniformly toward and away from the entire side surface of the reaction plate, that is, so that the inner surface of the stator becomes a vertical surface. Regulated.

〔Effect of the invention〕

According to the present invention, the thrust of the linear motor is inversely proportional to the square of the distance between the stator and the reaction plate. Since the linear motor is movably adjusted in the direction toward and away from the motor, the thrust of the linear motor can be used effectively to the maximum extent, so there is no need to use a linear motor with an unnecessarily large capacity, which is economical.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, a device for improving thrust at the time of starting a linear motor, in which Fig. 1 is a front view of the transport vehicle, Fig. 2 is a side view, Fig. 3 is an explanatory diagram of the transport vehicle running path, and Fig. 4 The figure is a detailed explanatory diagram of the present invention. ■ is the running path, and 3 is the transport platform! , 31 is a reaction plate, 38 is a guide roller, and 6 is a linear motor stator.

Claims (1)

[Claims] (1) In a device in which a large number of transport vehicles equipped with tiltable pans are connected to each other on a loop-shaped traveling path equipped with a plurality of sorting chutes, and the transport vehicles are driven by a linear motor, The stator of the linear motor that provides thrust to the reaction plate vertically installed on the underside of the bogie is attached to the running track frame via a movable device, and at the time of startup, the stator is moved close to the reaction plate side and the bogie is moved. 1. A thrust force improvement device when starting a linear motor, characterized in that the movable device is controlled to return and fix the stator to a set position after starting.