JPH0355134A - Lift device for assembly mounting table in unmanned truck - Google Patents

Abstract

PURPOSE:To simply perform the vertical position adjustment of a table by dividing the next work zone based on the detection result of a detecting means, reading the height positional data of an assembly mounting table in the work zone from a memory means and providing a driving control means which moves a table support member vertically based on this data. CONSTITUTION:When a detection means 18 detects a zone instruction member, a reading means 20 divides the next work zone based on this detection result, reading the height positional data of an assembly mounting table 13 in the work zone from a memory means 21. A driving control means 20 then adjusts the vertical position of the table 13 by vertically moving a support member (telescopic device) 10 in accordance with the height pisitional data read by this reading means 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lifting device for an assembly loading table in an unmanned trolley.

[Prior Art] In a factory, etc., an unmanned trolley that runs along a production line is loaded with objects, such as engine blocks, and the necessary parts are assembled in a predetermined order at each assembly station. The engine is completely destroyed. The contents of this assembly work differ depending on each station, and the parts to be assembled are assembled at various positions above and below the engine block.

In addition, there are individual differences in the height of the workers who perform the assembly at each assembly station, so if the engine block is held at a constant height on the unmanned trolley and the assembly work is performed at all the assembly stations. , the worker is forced to take an awkward posture at each station, which places a burden on the worker.

The automatic guided vehicle shown in FIG. 6 solves the above-mentioned disadvantages. That is, the height of the engine block E held in the vehicle 31 is adjusted by the worm gear 32, so that the worker M can move it up and down according to his/her height.

[Problem to be solved by the invention] However, the above-mentioned unono and gya 3 problems in the automatic guided vehicle
Adjustment No. 2 requires the operator to manually operate the lever 33 for each assembly operation, and the adjustment operation consumes time, which may significantly reduce work efficiency.

This invention was made to solve the above-mentioned problems, and its purpose is to provide an unmanned trolley that can improve work efficiency without requiring time to adjust the vertical position of the assembly loading device. An object of the present invention is to provide a lifting device for an assembly loading table.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides an elevating device for elevating and lowering an assembly mounting table formed on a vehicle, in which a plurality of predetermined storage means for storing data on the height position at which the assembly is to be held in each assembly work zone for each work zone; a detection means for detecting a zone indicating member indicating the work zone where the vehicle arrives; reading means for determining the next work zone based on the detection result of the means and reading height position data of the assembly mounting table in the work zone from the storage means; and height position data read by the reading means. The gist of the present invention is to provide a drive control means for vertically moving a support member that supports an assembly mounting table based on the above.

[Operation] When the detection means detects the zone indicating member, the reading means determines the next work zone based on the detection result, and reads the height position data of the assembly loading table in the work zone from the storage means.

Then, the drive control means moves the support member up and down according to the height position data read by the reading means.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 to 5.

In FIG. 3, a production line of a factory or the like is provided with a travel path 2 for an unmanned trolley 1, and along the travel path 2, a plurality of work zones (only one is shown), that is, assembly work stations 3 are installed. ing. Mark plates 4 as zone indicating members are provided immediately in front of each station 3 on the road surface of the traveling path 2, and the patterns of these mark plates 4 are different for each stage 3.

As shown in FIGS. 1 and 2, the frame 5 of the unmanned trolley 1
A crystal shelf 7 having three stages of receiving plates 6 is arranged at both front and rear ends of the frame 5, and a cassette holding part 8 extending almost the entire length of the frame 5 is provided on one side of the frame 5 in the direction of the station 3. . A cassette 9 for small parts is removably placed on the holding part 8, and a plurality of small parts such as bolts, nants, washers, etc. are housed in the cassette 9 in a sorted manner. There is.

Further, a telescoping device 10 as a support member is provided at the central portion of the frame 5 in the front-rear direction, and a lid table 11 is provided on the telescoping device 10 and directs an assembly mounting table 13 via a pedestal 12. .

When the unmanned trolley 1 arrives at the assembly work station 3, the small parts in the cassette 9 are used to place the object E (engine processor) mounted on the mounting table 13 on the parts shelf 6. The assembly parts P placed thereon are assembled.

The expansion and contraction device 10 is made up of two pieces that obliquely connect the bottom surface B and the lifter table 11 within the bellows-shaped protective cover 14.
Only one of the two pairs is shown in the figure, and is constituted by rotating bars 15, and the central portions of both rotating bars 15 in the longitudinal direction are rotatably connected to each other. Further, a stroke sensor 16 consisting of a potentiometer for detecting the vertical position of the front-rising lid table 11 is provided adjacent to both rotating bars 15. Then, when the electric cylinder 17 (described later) is extended, both rotating bars 15 rotate in a direction toward each other around the central connection point, thereby raising the mounting table 13 as shown by the two-dot chain line.

When the electric cylinder 17 is contracted in this state, both rotating bars 15 are rotated in a direction away from each other, and the mounting table 13 is lowered as shown by the solid line.

Next, the electrical structure of this embodiment will be explained with reference to FIG.

A mark sensor 18 serving as a detection means provided on the bottom surface of the unmanned trolley 1 is a photoelectric sensor, detects the mark plate 4, and outputs this detection signal to a controller 19 built in the unmanned trolley 1. The stroke sensor 16 detects the height of the beam lid table 1, that is, the height of the mounting table 13, and outputs this detection signal to the controller 19.

The controller 19 includes a central processing unit (CPU) 20 as a drive control means and a reading means;
The CPU 20 is comprised of a read-only memory (ROM) 21 as a storage means that stores 20 control programs, and a readable and writable memory (RAM) 22 that temporarily stores the calculation results of the CPU 20. The ROM 2 1 contains station data regarding the assembly work station 3 corresponding to the pattern of each mark plate 4, and information regarding the vertical position (assembly height position) at which the assembly part P is assembled to the engine block E at each station 3. Height position data and worker height data regarding the height of the worker at each station 3 are stored in advance.

The CPU 20 calculates the current height position (current height position i) Hp of the mounting table 13 according to a predetermined program in accordance with the signal from the stroke sensor l6. The CPU 20 determines the assembly work station 3 at which the unmanned cart 1 will arrive next from various data stored in the ROM 21 according to the detection signal from the mark sensor 18, and then determines the assembly height at this work station 3. The position and height of the worker are read, and the optimal height position H of the mounting table 13 during assembly work at the station 3 is calculated. Then, the CPU 20 drives the electric cylinder 17 according to this calculation result.

Now, the operation of the cassette exchanging device configured as described above will be explained with reference to the flowchart of FIG.

Now, the unmanned trolley 1 is running on the running path 2, and when the signal from the mark sensor 18 that has detected the mark plate 4 is input in step S1 (hereinafter referred to simply as S), the CPU 20 moves the unmanned trolley in step S2. In step S3, the assembly height position and the height of the worker at the station 3 are stored in the ROM 2.
The optimum height position H of the mounting table 13 is calculated from these values. After this, when a detection signal is input manually from the stroke sensor 16 in S4,
In S5, the current height position Hp of the mounting table 13 is calculated.

Then, if the CPU 20 determines that both height positions H and llp are not equal in S6 and that the current height position Hp is larger than the optimal height position H in S7, then in S8 (current height position Hp - optimal height position The cylinder 17 is contracted by an amount based on the value of H) and the process returns to S1. In addition, the CPU 20 is
If it is determined that the current height position} {p is smaller than the optimal height position H in step 7, the cylinder 17 is extended by an amount based on the value of (optimal height position H - current height position Hp) in step S9, and the cylinder 17 is extended to Sl. return. Furthermore, in S6, the optimum height position iH
and the current height position Hp are equal, the CPU 2 0
The mounting table 13 is held at the current height position Hp without driving the cylinder 17 by SIO, and the process returns to S1.

As mentioned above, in this embodiment, the ROM2
The CPU 20 calculates the maximum height of the loading table 13 based on the height of the worker for each station 3 and the height at which the assembly part P is assembled to the engine block E stored in the loading table 13. The current height of the mounting table 13 is corrected so that it becomes this optimal height. Therefore,
The worker can assemble the assembly parts P to the engine block E which is always held at the optimum height, and the physical burden is reduced without having to work in an unreasonable posture.

Further, since the height adjustment of the mounting table 13 is automatically performed, this adjustment does not require much time and good work efficiency is ensured.

[Effects] 10 As detailed above, the present invention has the excellent effect of making it possible to improve work efficiency without requiring time to adjust the vertical position of the assembly loading device. do.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the unmanned cart, Fig. 2 is a side view showing the unmanned cart together with the operating principle of its elevating device, Fig. 3 is a plan view showing the unmanned cart running on a running route, and Fig. 4 is a plan view of the unmanned cart. Block circuit diagram showing the electrical configuration of the invention, Figure 5 is the CPU
FIG. 6 is a perspective view showing a conventional example. Travel path 2, assembly work station 3 as a work zone
, a mark plate 4 as a zone indicating member, a telescopic device 10 as a support member, an assembly loading table 13, a mark sensor 18 as a detection means, a CPU 20 as a reading means and a drive control means, and a ROM 2 as a storage means.
1.

Claims (1)

[Claims] 1. In a lifting device for raising and lowering an assembly loading table formed in a vehicle, the optimal height position of the assembly is determined in a plurality of predetermined assembly work zones along a vehicle travel path. a storage means for storing data for each work zone; a detection means for detecting a zone indicating member indicating the work zone where the vehicle arrives; and a detection means for determining the next work zone based on the detection result of the detection means; reading means for reading height position data of the assembly mounting table in the work zone from the storage means; based on the height position data read by the reading means;
A device for lifting and lowering an assembly mounting table in an unmanned trolley, comprising a drive control means for vertically moving a support member that supports the assembly mounting table.