JP3628561B2 - Limit switch actuator for chain block - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a limit switch operating device that detects upper and lower limit movements of a chain block.
[0002]
[Prior art]
For example, as shown in FIG. 4, an overwinding prevention limit switch used in a conventional electric chain block or the like has an intermediate portion of a limit lever 24 on an operating shaft 23 for operating the overwinding prevention limit switch of the electric chain block 21. An annular outer circumferential groove 28 is provided at the lower part of cylindrical chain guide members 26 and 27 having chain guide holes fixed on both sides of the limit lever 24 and provided at the upper end of a cylindrical small-diameter coil spring 29. A large-diameter coil spring 31 is continuously connected via a taper coil spring 30 that expands in the upward direction, an operation coil spring 32 is provided, and the electric chain block 21 is wound up. When it reaches, the load supporting hook 44 or the stopper 47 attached to the chain 48 at the upper part thereof is connected to the operation coil. 32, the limit lever 24 is rotated via the operation coil spring 32, the overwinding prevention limit switch is operated via the operation shaft 23 and the switch operation member, and the electric chain block 21 is The hoisting operation is stopped. On the other hand, when the electric chain block 21 is unrolled and operated, and the unwinding operation reaches the limit, the stopper 49 attached to the end of the unloaded side of the chain 48 comes into contact with the lower end of the operation coil spring 32. Then, the limit lever 24 is rotated via the operation coil spring 32, the overwinding prevention limit switch is operated via the operation shaft 23 and the switch operation member, and the electric chain block 21 is unrolled and stopped. It is configured as follows. Engagement protrusions 36 are provided on both front and rear sides of the chain guide 27 and are inserted into the engagement holes 46 of the limit lever 24. In the figure, reference numeral 43 denotes a load sheave.
[0003]
[Problems to be solved by the invention]
The above-described conventional overwinding limit switch device includes an operation coil spring, a large-diameter coil spring, a chain guide member, and an outer peripheral groove, an engagement protrusion, an engagement hole, a limit lever, an operation shaft, and the like provided on the outer periphery thereof. In addition, the number of parts and the number of parts processing man-hours are high, and the use of coil springs increases the dead space.In addition, if the coil springs are not accurately guided to the chain guides during operation, the limit lever will malfunction, The operation angle of the limit switch is also adversely affected, and there is a problem in that it hinders accurate operation of the limit switch.
[0004]
[Means for Solving the Problems]
The present invention solves the above-mentioned problems, a pair of side plates fixed by sandwiching a plate-like guide around a rotating shaft that operates a limit switch, and a winding stretched over one end of the side plate below the chain block main body. An operating body having a detection operation plate and a lowering detection operation plate projecting inward from each other at the lower end of the other end is provided, and the upper and lower limit switches of the chain block are operated by the detection operation plate. This is a limit switch operating device for a chain block.
[0005]
According to the present invention, a pair of side plates provided with a plate-like chain guide provided below the chain block main body, a winding detection operating plate straddling the upper end of one end of the side plate, and a lower end of the other end inside each other. The upper and lower limits of the chain block's vertical movement are detected by the operating body formed from the lowering detection actuating plate projecting toward the end, and the motor operation is stopped by the limit switch. Compared with the switch device, the number of parts and parts machining are significantly reduced, and the upper and lower limits of the chain block can be detected by a simple detection operation, so that the limit switch can be operated accurately.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 of the present invention includes a plate chain guide (11) fixed below the housing (2) of the chain block (1) body,
A rotating shaft (6) for operating a limit switch provided below the chain block body;
A pair of side plates (8,8) which is fixed to the rotary shaft across the plate chain guide,
At one end the upper portion of the side plate, the lower hooks (4) of the stopper (13) is straddled the possible contact positions hoisting detecting actuation plate (9),
Lowering detection actuating plates (10, 10) projecting inward from each other at positions where the stoppers provided at the end portions of the no-load side chains can be brought into contact with each other at the lower end of the other side plate.
A limit switch operating device for a chain block characterized by comprising: a pair of side plates provided sandwiching a plate-like chain guide provided below the chain block main body, and a winding detection straddling over one end of the side plate The upper and lower limits of the chain block's vertical movement are detected by the operating body formed from the operating plate for lowering and the lowering detection operating plate projecting inward at the lower end of the other end, and the motor is operated by the limit switch. Since it is configured to stop, compared to the limit switch device of the conventional device, the number of parts and parts processing can be greatly reduced, the cost can be reduced, and the upper and lower limits of the chain block can be detected by a simple detection operation. Therefore, the limit switch can be accurately operated.
[0008]
The invention according to claim 2, wherein the plate-shaped chain guide (11), hoisting chain according to claim 1, wherein the detection operation plate (9) is characterized in that to form a groove (11b) retractable This is a block limit switch operating device, and in addition to the operation of the first aspect of the invention, it has the operation of greatly reducing the dead space due to the limit switch operating device.
[0009]
Embodiment
With reference to FIGS. 1-3, the upper / lower limit switch operating device for chain blocks by embodiment of this invention is demonstrated.
[0010]
In the figure, 1 is a chain block, 2 is a housing, 3 is a chain extending downward from the housing 2, 4 is a lower hook attached to the lower end of the chain 3, and 5 is an actuator support block provided below the housing 2, Reference numeral 6 denotes a rotary shaft for operating a limit switch (not shown), 6a denotes an end of the shaft, 7 denotes a limit switch operating body, 8 denotes an operating body, and a chain is connected to the rotating shaft 6 provided in the support block 5. A pair of side plates fixed with the guides sandwiched therebetween, 9 is an operation plate for detecting the hoisting straddled on one upper end of the side plate 8, and 10 is a lowering detecting operation provided on the lower end of the other end of the side plate 8 toward each other. An operation plate 11 is provided at the lower part of the housing, and is a plate-shaped chain guide having guide holes for load side and no load side chains, 11a is a guide hole, and 11b is an operation plate provided at the lower part of the guide. Grooves, 12 load sheave provided on the housing 2, 13 is a stopper. The hoisting detection actuating plate 9 is at a position where the stopper 13 at the top of the lower hook can come into contact, and the lowering detecting actuating plate 10 is at a position where the stopper provided at the end of the no-load side chain can be brought into contact. It is arranged.
[0011]
Next, the operation of the limit switch operating plate according to the present invention will be described.
The hoisting detection actuating plate 9 is disposed at a position where the stopper 13 of the lower hook can be brought into contact, and the lowering detection actuating plate 10 is arranged at a position where the stopper provided at the end of the no-load side can be brought into contact. The hoisting detection actuating plate 9 is normally in contact with the side surface of the chain and is positioned at the dotted line in FIG. Next, when the chain 3 is wound up and the stopper 13 of the lower hook 4 comes into contact with the operation plate 9, the operation plate 9 rotates and a limit switch (not shown) is operated via the rotation shaft 6. Then, the driving of the motor is stopped. At this time, the upper surface of the stopper 13 comes into contact with the lower surface of the plate-shaped chain guide 11, and the operation plate 9 is retracted in the concave groove 11 b provided in the chain guide 11.
[0012]
During the lowering operation, when the no-load side chain is hoisted by the lowering operation, a stopper (not shown) provided at the end of the no-load side chain (not shown) comes into contact with the lowering detection operation plate 10. Then, the operating body 7 is rotated, a limit switch (not shown) is operated via the rotating shaft 6, and the driving of the motor is stopped. At this time, the operation plate 10 comes into contact with the lower surface of the plate-like chain guide 11 and is stopped.
[0013]
As described above, the present invention includes a pair of side plates provided with a plate-like chain guide provided below the chain block main body, a winding detection operation plate straddling the upper end of the side plate, and the other end. Because the upper and lower limits of the vertical movement of the chain block are detected by the operating body formed from the lowering detection operating plates projecting inward at the bottom, the motor operation is stopped by the limit switch. Compared with the limit switch device of the conventional device, the number of parts and parts processing are greatly reduced, and the upper and lower limits of the chain block can be detected by a simple detection operation, so the limit switch can be operated accurately Can do.
[0014]
【The invention's effect】
The present invention includes a pair of side plates provided sandwiching a plate-like chain guide provided below the chain block body, a winding detection operating plate straddling one end upper portion of the side plate, and a lower end of the other end facing each other inwardly. The upper and lower limits of the vertical movement of the chain block are detected by the operating body formed from the lowering detection actuating plate, and the motor operation is stopped by the limit switch. Compared to the equipment, the number of parts and parts processing can be greatly reduced and the cost can be reduced, and the upper and lower limits of the chain block can be detected by simple detection operation, so the limit switch can be operated accurately. Has the effect of
[Brief description of the drawings]
FIG. 1 is a side view showing an outline of a limit switch operating device according to the present invention.
FIG. 2 is a partially enlarged view of FIG.
FIG. 3 is an enlarged plan view showing the operating body and chain guide of FIG. 1;
FIG. 4 is a cross-sectional view showing a conventional limit switch operating device.
[Explanation of symbols]
1 Chain Block 2 Housing 3 Chain 4 Lower Hook 5 Support Block 6 Rotating Shaft 6a Shaft End 7 Actuator 8 Side Plate 9 Lifting Detection Actuation Plate 10 Lowering Detection Actuation Plate 11 Chain Guide 11a Guide Hole 11b Groove 12 Load Sheave 13 Stopper

Claims (2)

A plate-like chain guide (11) fixed below the housing (2) of the chain block (1) body;
A rotating shaft (6) for operating a limit switch provided below the chain block body;
A pair of side plates (8,8) which is fixed to the rotary shaft across the plate chain guide,
At one end the upper portion of the side plate, the lower hooks (4) of the stopper (13) is straddled the possible contact positions hoisting detecting actuation plate (9),
Lowering detection actuating plates (10, 10) projecting inward from each other at positions where the stoppers provided at the end portions of the no-load side chains can be brought into contact with each other at the lower end of the other side plate.
A limit switch actuating device for a chain block, comprising: The limit switch actuating device for a chain block according to claim 1, wherein the plate-like chain guide (11) is formed with a concave groove (11b) in which the hoisting detecting actuating plate (9) can be retracted.

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