JPS58135018A - Overload detecting means of lift conveying device - Google Patents

Abstract

PURPOSE:To automatically detect an overload in the captioned device which moves a moving member along a vertically endless circulative route, by supporting an endless chain rotary member to a movable frame provided in the bottom end of the route and providing a lift detector of the movable frame. CONSTITUTION:A motor 17 is operated to turn chains 4a, 4b wien normal lift motion of a moving member is disturbed to apply an overload to the chains 4a, 4b, reaction applied upward to a movable frame 10 is increased to lift and move the frame 10 then assist turning of a driving gear 8a. This lift movement of the frame 10 causes a switch operating member 10a to operate a limit switch 19 and automatically stop the motor 17 then generate an alarm. By this constitution, the overload can be automatically detected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention drives a movable body that circulates along an endless circular movement path using an elevating conveyance device, particularly an endless rotating body stretched along an endless circular movement path in the vertical direction. In the elevating and lowering conveyance device, which is configured as shown in FIG. This is what we provide.

An embodiment of the present invention will be described below with reference to the attached illustrative drawings.

In FIG. 1, 1 indicates an ascending route section 2a and a descending route section 2.
b, and horizontal path portions 3 at both upper and lower ends, as shown in FIGS. 1 and 2, an endless chain 4a as an endless rotating body with two inner and outer rotating bodies on each side, as shown in FIGS. 1 and 2, 4b and 5a, 5b are inner tunes 4a, 4
The four gear wheels 6a to 9a and 6b to 6b are arranged so that the upper and lower ends of the movement path of the outer chains 5a and 5b are higher than the upper and lower ends of the movement path of the outer chains 5a and 5b, respectively. It is hung by b. Gear wheel 4 guiding the upper end U-turn portion of each chain 4a to 5b
a, 7a and 6b, 7b are pivotally supported by fixed frames (not shown) independently disposed on both sides of the moving path of the moving body 20, which will be described later, and the lower end U-turn portions of the chains 4a to 5b are The guiding gear wheels 8a, 9a and 8b, 9b are free from illumination, as shown in the imaginary lines in FIG. 1 and in FIGS.
It is pivotally supported by a movable frame 1° provided at the lower end of the circulation path 1.

The movable frame 1o has side frames 11 on both sides of the moving path of the movable body 2o that are acid-resistant and that pivotally support the gear wheels 8.9.
the connecting member 1 at a location that does not obstruct the movement of the moving body 2o.
The guide wheel 1 is connected to the guide rail 14 connected to the guide rail 14 by a fixed frame 13, and is fitted into a vertical guide rail 14 supported by a fixed frame 13.
5 is pivotally supported on the side frame 11, and can be moved up and down. A pair of left and right gear wheels 8 are pivotally supported by the movable frame 1o and guide the chains 4a and 4b.
Even if the left and right pairs of gear wheels in a and 9a are connected by a shaft,
A pair of left and right gear wheels 8a whose shafts do not interfere with the movement of the movable body 2o are interlocked with each other by a shaft 16 as driving gear wheels for driving the chains 4a and 4b, and a motor mounted on the movable frame 1°. 17 through a chain transmission means 18. In Figure 5, 1
A limit switch 9 serves as a detector for detecting upward movement of the movable frame 10, and is operated by a switch operating member 10a attached to the movable frame 10.

Reference numeral 20 denotes a movable body that circulates along the endless circulation path 1 while maintaining a constant vertical posture; 21 denotes a movable body that is supported by the movable body 20 so as to be movable in the vertical direction; A conveyor lift rail 25 is held horizontally via a pair of left and right support arms 22 that protrude in the direction. 2
4 connects the movable body 21 on the movable body 20, which is disposed at a stop position at each level of the movable body 20 and stopped, to the conveyor fixed rail 25, 26 on the fixed side of the elevating rail 2B. It is a means of pushing up to a height.

As shown in FIGS. 3 and 4, the movable body 20 has main guide rollers 28 at both upper and lower ends of a pair of left and right guide rails 27 installed on the ascending route section 2a and the descending route section 2b. A pair of inner left and right chains 4a are supported via a left and right steady rest roller 29, and a horizontal shaft 30 fixedly protrudes concentrically from the upper end on both left and right sides.

It is rotatably supported on 4b. Sl is a lever whose upper end is fixed to the outer end of the horizontal shaft 50, and whose lower end is rotatably pivoted to a horizontal shaft 32 that protrudes concentrically from a pair of outer left and right chains 5a, 5b. I'm being forced to do it.

With this configuration, as shown in FIG. The lever 2st prevents the movable body 20 from swinging about the horizontal axis 60, and the movable body 20 always maintains a vertical posture and circulates up and down.

The movable body 21 is supported by a pair of left and right vertical guide rails 253, which also serve as the frame of the movable body 20, via a main guide roller 254 and a steady rest guide roller 15 so as to be movable up and down.

Reference numeral 36 denotes a normally closed stopper which can be opened and closed at the exit side of the conveying moving body transferred onto the conveyor lifting rail 25, and is opened and moved by a cylinder unit (not shown) arranged in parallel with the lifting means 24.

Next, how to use it and its effects will be explained. The motor 17 drives the pair of left and right drive gears 6a to connect the chains 4a, 4.
b is rotated to move the movable body 20 via the horizontal shaft 30 to the first position.
Circulate in the direction shown by the arrow in the figure. At this time, the chain Sal 5b has the ascending route section 2a and the descending route section 2b.
As a result of being pulled via the lever 61 by the movable body 20 moving between the tuners 4al and 4b, they rotate together with the tuners 4al and 4b.

When the horizontal axis SO moves laterally on the horizontal path section 3, the lower end of the lever 61 is fitted to the horizontal axis δ2 of the chains 5a, 5b, so that the roller 28 of the movable body 20.
Even if 29 comes off the guide rail 27, the moving body 20 remains on the horizontal axis along with the lever 31! Without swinging around the IO, each moving body 20 circulates along the endless circulation movement path 1 while always maintaining a constant posture.

As shown in FIGS. 2 and 3, the conveyor elevating rail 26 of the movable body 21 at the stop position at each level, that is, the lowering limit position on each movable body 20, When reaching a position slightly lower than the fixed rails 25 and 26, the driving of the chains 4a and 4b is interrupted and each moving body 20 is stopped. Thereafter, each push-up means 24 pushes up the movable body 21 relative to the stopped movable body 20 to a fixed stop position.

The conveyor lifting rail 23 of the movable body 21 that has reached the fixed stop position is moved to the fixed conveyor rail 25.2 at the same level.
It will be in a straight line with 6. In such a state, as shown in FIG. 3, the conveyance movable body '57 waiting on the fixed rail 25 can be transferred onto the elevating rail 23 on the movable body 21 by an appropriate push transfer means. .

The transport moving body 57 may be of any type, but for example, the conveyor fixed rails 25 and 26, and the lifting rail 23.
A pair of front and rear trolleys ’58 (see Figures 3 and 4) that move upward and sit astride each other, and hangers suspended from these trolleys 38! I9 can be used.

40 is an object to be transported suspended from a hanger 69.

When the transfer of the transportation movable body 57 onto the conveyor lift rail 25 is completed, the movable body 21 supported by the pushing up means 24 is moved together with the lift rail 25 supporting the conveyance movable body 37. After being lowered to the lower limit position supported by the movable body 20, the chains 4a and 4b are driven again by the motor 17, and the movable body 20 is moved along the endless circulation path 1. When transferring the conveyance moving body S7 conveyed together with the moving body 20 to the conveyor fixed rail 26 at the target level, connect the lifting rail 25 on the movable body 21 to the fixed rail 26 at the target level as described above. and move the elevator rail 22 using appropriate push-up transfer means.
! It is sufficient to move the transporting moving body 67 on the top 1 onto the fixed rail 26 by pushing it up. However, if the moving body 20 can be accurately stopped at a predetermined position, the movable body 21 can be omitted and the support arm 22 can be moved. It can also be provided directly protruding from the moving body 20.

In the usage conditions described above, when the motor 17 is operating to rotate the chains 4a and 4b, the actual object may get caught between the guide rail 27 and the rollers 28, 29, or the lifting rail 25 and the fixed rail may become stuck. If a situation occurs that interferes with the normal vertical movement of the movable body 20, such as a collision between the chains 25 and 26, and the load acting on the chains 4a and 4b increases, the upward reaction force acting on the movable frame 10 The force increases, and the movable frame 10 moves upward to help rotate the drive gear 8a. By this upward movement of the movable frame 10, the switch operating member 10a operates the limit switch 19, and the switch 19 is closed or opened. In conjunction with the detection operation of the switch 19, the motor 17 can be automatically stopped, and furthermore, an alarm can be automatically activated to notify of an abnormality.

As in the above-mentioned embodiments, according to the overload detection means of the present invention, if a situation occurs that disturbs the normal circulation movement of a moving body circulating on an endless circulation movement path, the endless movement driving the moving body When an overload acts on the motor that drives the rotating body (chains 4a, 4b), the detector (limit switch 19) that detects the upward movement of the movable frame 10 automatically detects the occurrence of the overload, and Necessary measures, such as stopping the drive of the rotating body, can be automatically taken. Moreover, according to the configuration of the present invention, the movable frame 10 is urged downward by gravity, so there is no need to use special tensioning means (tension coil springs, etc.) ) can also be used as a take-up means for absorbing the elongation, which greatly contributes to reducing the cost of the entire device.

Note that as the conveyed object support means provided on the moving body 20,
Although the rail 25 that guides the transportation moving body 2S7 is shown,
Various types of conveyors, overlays, and others that directly support and convey objects can be used. Further, in order to keep the posture of the movable body 20 constant, the lever 051 and the chains 5a and 5b are used together, but the present invention is not limited to such an elevating and lowering conveyance device.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is an overall side view, FIG. 2 is a front view thereof, FIG. 3 is an enlarged front view of main parts, and FIG. 4 is a plan view thereof. Fig. 5 is a partial vertical sectional side view of the main part of the present invention, and Fig. 6'vA is a front view of the part. 1... Endless circulating movement path, 4a to 5b... Endless chain (endless rotating body), 6 a to 9 a, 6 b
~9 b-...Gear (rotating body), 10...Movable frame, 14...Guide rail, 16...Transmission shaft, 1
7...Motor, 19...Limit switch (detector), 20...Moving body, 21...Movable body, 225I
... Lifting rail for conveyor, 24 ... Push-up means, 25.26 ... Fixed rail for conveyor, 27.53
...Guide rail, 67...Transportation moving body 1 Fig. 6

Claims (1)

[Claims] A moving body that circulates along the endless circulation movement path is driven by an endless rotating body stretched along the endless circulation movement path in the vertical direction, and the moving body is provided with means for supporting a transported object. In the elevating conveyance device, a movable frame that can be raised and lowered is provided at the lower end of the endless circulation path, and a rotating body that guides the lower end U-turn portion of the endless rotating body and drives the endless rotating body on the movable frame. is pivoted,
Overload detection means for an elevating and lowering conveyance device, comprising: a motor for driving the drive i rotating body mounted on the movable frame; and a detector for detecting upward movement of the movable frame.