JPS6156859A - Conveying method - Google Patents

Abstract

PURPOSE:To prevent a conveying track from being jammed and enable the conveying power to be improved, by providing an empty conveying car in a standy state in one of the branch tracks selecting a station with a small number of conveying times placed before in the running direction of a station with a large number of conveying times. CONSTITUTION:The method continually provides an emptied conveying car 1a, 1b in a standy state in a station A, F with a small number of conveying times corresponding to a before side in the moving direction of conveying cars 1a-1e moving in the direction of an arrow head along a track 2 of loop shape for a station B with a large number of conveying times. And the method, in which the empty conveying car 1a in the station A near the station B for its conveyance requirement moves to the station B to load a conveyed material to be unloaded in the destination station while the empty conveying car 1b in the station F or a conveying car of the emptied conveying cars in the other station near the station A moves to the station A with an empty car disappearing waits for the next conveyance requirement. Accordingly, the method, preventing the track from being jammed by the empty car on the track, enables the high conveying power to be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a conveyance system, and particularly relates to a general conveyance method that reduces waiting time for conveyance requests and conveys without congestion.

[Technical background of the invention and its problems]

For example, in the semi-sensor process, as shown in Figure 3, objects such as silicon wafers are moved to a station (ro).
When transporting vehicles (1a) to (1)
e) by moving along the trajectory (2), for example in the direction indicated by the arrow. −For example, station■
) to station 03), first, the transport vehicle (1c) in the waiting zone (3) is station color).
In response to a transport request, the vehicle goes to station (3) and loads the goods, goes to station CB> and unloads the goods, and when the car becomes empty, it returns to the waiting zone and waits for the next transport request. Similarly, when transporting objects from the waiting zone to station (5), the transport vehicle loads the objects from the waiting zone to station (5) and moves in the direction of the arrow to station (2a) through track (2a). After unloading the transported items, it returns to the waiting zone again. Conveyance between each station is carried out by constantly repeating such operations.

In the prior art, when a car becomes empty, it always returns to the waiting zone to wait for a transport request, which increases the number of times the empty car moves on the track and lengthens the time it occupies the track. Therefore, congestion occurred on the track, and the time from when a transport request was issued until the actual transport was completed was long, and the transport capacity was limited. If a plurality of standby zones are provided at multiple locations, the space will increase and extra branching sections will be required, which will lengthen the traveling time of the transport vehicle and will not contribute to improving the overall transport capacity.

Therefore, there is a need for a space-efficient and high-capacity transportation system that can solve these problems (
Haru.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a transport method that reduces congestion on a transport track and has high transport capacity.

[Summary of the Invention] In a transport method in which a plurality of stations are arranged along a roof-shaped track and objects are transported to the stations by a transport vehicle traveling in a fixed direction on the track, the above-mentioned transport vehicle of a station that is frequently transported is provided. An empty conveyance vehicle is made to wait on at least one selected from the station 7 and the branch track, which are in the traveling direction ^IJ and have a small number of conveyances.

[Embodiments of the invention]

An embodiment of the present invention will be described below in detail with reference to the drawings. Note that the same parts as those in FIG. 3 used in the explanation of the prior art are given the same symbols, and detailed explanation will be omitted.

As shown in Figure 1, among the station prisoners (F), the station that is transported the most times is designated as (B), and conversely, the stations that are transported the least number of times are designated as (B) and V).
Transport vehicles (1a)...(1e) move in the direction of the arrow along the loose trajectory (2) with respect to station Q3).
), the movement direction of which is toward the front (5).

Empty transport vehicles (la) and (lb) are always on standby at station CB), which is located nearer station CB). ) For example, a transport vehicle (la) goes to station (B), loads the transported goods, goes to the destination station, and unloads fJt. At station (5), where there are no vacant vehicles, there is an empty vehicle at station ■. A cliff transport vehicle (1b) goes, or a nearby empty Saki transport vehicle at another station goes and waits for the next transport request.For example, station ■ or station When the conveyance vehicle arrives at ■ after transporting goods, the operation is repeated such that after the empty vehicle leaves station (G), the empty vehicle enters station ■ and waits.

According to the transport method of the embodiment, the congestion on the track due to empty cars that occurred in the conventional technology is eliminated, and the loss time can be reduced in response to transport requests from stations that have a large number of transports, so the capacity of the entire transport system can be improved. It is possible to achieve a very high general feed capacity. Furthermore, since the number of waiting zones can be reduced, space can be used effectively.・In addition, the place where empty cars wait is not limited to the station, but the same effect can be obtained by having empty cars wait at the bypass (2b) part of the track, as shown in Figure 2. can be obtained.

Further, both a station and a bypass may be used as a waiting area for empty cars.

〔Effect of the invention〕

According to the present invention, congestion on the tracks due to empty cars is eliminated,
Since the loss time can be reduced in response to transport requests from stations that have a large number of transports, the performance of the entire transport system can be improved and extremely high transport capacity can be achieved. However, since the number of waiting zones can be reduced, the space can be used effectively.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conveying method according to an embodiment of the present invention, 'P;
Figure 2 is an explanatory diagram of a conveying method according to another embodiment of the present invention, 8F
FIG. 3 is a 612-color diagram of the conventional conveyance method. ■...Nishti John: (1a)...(le)
: fQ vehicle transport, (2): Track, (2b): Bypass (branch track).

Claims (1)

[Claims] In a transportation method in which a plurality of stations are arranged along a loop-shaped track and a conveyance vehicle traveling in a fixed direction on the track transports the object to the station, the object is transferred to a specific station selected from among the plurality of stations. On the other hand, at least one selected from a station that is located close to the front side in the traveling direction of the conveyance vehicle and that has a fewer number of conveyances than the specific station, and a branch track that is provided branching off from the track. A transportation method characterized in that the transportation vehicle, which has become empty, is placed on standby on one side.