JPS62218369A - Dual linear winch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a multiple linear winch as a pulling winch, and particularly to a dual linear winch that integrally operates two intermittent linear winches.

[Prior Art] U.S. Patent No. 4, 42 issued on January 24, 1984
Intermittent linear winches, such as those shown in No. 7.180, have been used alone to perform hoisting or hoisting operations.

[Problems to be Solved by the Invention] The present invention uses a plurality of such winches in an integrated manner. Conventionally, a single linear winch has been used, but as the load increases, it becomes necessary to use multiple linear winches. however,
If multiple linear winches are individually controlled, the load cannot be lifted or lowered in an almost even manner, making it impossible to perform lifting or lowering operations smoothly, and in the worst case, the load may be tilted. Excessive loading may cause problems such as the load falling off.

An object of the present invention is to provide a dual linear winch that can integrate the operations of each linear winch when a plurality of linear winches are used.

[Means for Solving the Problems] A dual linear winch for lifting and lowering a load according to the present invention has a first linear winch connected by a cable to one end of the load, and a first linear winch that is hydraulically operated. It has a cable gripper that makes reciprocating motion.

Also in the present invention, the second linear winch is connected to the other end of the load by another separate cable. The second linear winch also has a cable gripper that is hydraulically operated and reciprocates. Power supply means are provided for supplying pressurized hydraulic fluid to the two linear winches.

Additionally, the programmable controller supervises the reciprocating motion of the winch and controls the output of pressurized hydraulic fluid delivered from the power supply.

In this way, the invention provides a dual linear winch that integrates the intermittent lifting action of the two winches to ensure that the load is lifted evenly.

[Operation of the Invention] According to the present invention, since the first and second linear winches are controlled by a programmable controller, the operations of the first and second linear winches can be easily integrated and the load can be applied almost uniformly. It can be raised or lowered one stone at a time.

[Example]　゛ Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 2, dual linear winch 10 includes a pair of linear winches 12 and 14 mounted on a support or bridge 16.

A power unit 18 (1'jJ force supply means) is also attached to the bridge 16 for supplying electric power and hydraulic fluid to the linear winch 12.14.

The dual linear winch 10 also includes a set of storage reels 20.22 for storing cables 24.26 for each linear winch 12.14.

Cables 24,26 lead through linear winches 12,14 to bully drives 28, 30 mounted in opposite directions at generally opposite ends of load 32.

Each linear winch 12,14 is of the type shown in FIG. This type of linear winch provides a fixed pulling action. The structure and operation of this linear winch are explained in detail in U.S. Pat. No. 4,427,180 using FIGS. 3 to 5.
In this specification, only general matters regarding the structure and operation of this linear winch will be described.

The linear winch 12 shown in FIG. 3 uses two sets of clamping wedges 34 and 36 arranged one above the other in order to clamp the cable.

The linear winch 12 has a fixed frame 38 fixed to an outer fixed member 40 of the clamp wedge 34.

The linear winch 12 also includes a plurality of truncated cylinders 42 between oblique parallel planes formed by the outer fixed member 40 and the plurality of inner movable members 44 . As the plurality of truncated cylinders 42 pivot during relative movement of the members making up the clamping wedge, the truncated cylinders 42 are interlocked with each other by mating studs 46 and 46 is bar 48
and parallel to the oblique bearing surfaces of the outer fixed member 40 and the inner movable member 44 of the clamp wedge.

Two double-action hydraulic cylinders 50 are arranged parallel to the cable with two vertically aligned clamping wedges 34, 36, one of which can be moved in translation. connected to the cylinder part side (flange 58 side) of the cylinder 50,
The other wedge is connected to the piston portion (flange 56 side) of the cylinder 50, and the wedges 34 and 36 move toward and away from each other in accordance with the movement of the hydraulic cylinder.

Furthermore, when increasing the load, both cylinders 5
Coincident with the contraction of 0, the lower clamping wedge 36 is connected to the cable and the upper clamping wedge 34 is released from the cable, and in order to lower the load, the lower clamping wedge 36 is connected to the cable, consistent with the extension of the cylinder. Once connected, the upper clamping wedge 34 is released from the cable.

A pair of plate-shaped friction plates 51 are attached to the inner movable member 4 of the lower clamp wedge 36 and the upper clamp wedge 34.
4.54 side (parallel to the page of the drawing) and the side of the 7 langes 56.58 of each clamp wedge (the side parallel to the page of the drawing), with the cable in between. has been done. Note that the 7 langes 56 and 58 each consist of two plate-like members, but in FIG. 7 in contact with the friction plate 51
One of the plate members forming the flange 56, 58 is not shown. The pair of friction plates 51 have seven lunges 56.
Inner movable member 44 by spring means attached to 58
．． It is elastically pressed against the side surface of 54. Therefore, the inner movable members 44, 54 are each sandwiched between a pair of friction plates 51.

If the winch is in the position shown in FIG. 3, the lower clamping wedge 36 is connected to the cable and the upper clamping wedge 34 is free from the cable. When the hydraulic cylinder 50 is actuated to extend, ie move the lower clamping wedge 36 away from the upper clamping wedge 34, the outer member 60 of the lower clamping wedge 36 is pushed downwardly, unclamping the cable. . At the same time, the friction plate 51 is moved downward as the inner member 54 of the lower clamp wedge 36 moves.

When the rfJm plate 51 moves downward, the friction plate 5
1 pushes down the inner movable member 44 of the upper clamp wedge 34, so that the cable 1 is clamped by the upper clamp wedge 34.

As a result, the lower clamp wedge 36 is free to move away from the upper clamp wedge 34. The upper clamp wedge 34 is moved until the lower clamp wedge 36 reaches the most extreme position of the lower clamp wedge 36 which corresponds to the maximum extension of the hydraulic cylinder 50.
The cable is clamped and fixed, so that the suspended load remains at the height previously reached.

Then, when the upper clamping wedge 34 is connected to the cable and the lower clamping wedge 36 is in the released state from the cable, the hydraulic cylinder 50 is retracted, i.e. the lower clamping wedge 36 is connected to the upper clamping wedge 3.
4, the hydraulic cylinder 50 is operated in the opposite direction. The outer member 60 of the lower clamping wedge 36 is then pulled upwards and exerts pressure against the inner member 54 of the lower clamping wedge 36 which is connected to the cable 1 . At the same time, the inner member 54 of the clamp wedge 36 is lifted, causing the friction plate 5
2 also moves upward, so that the inner movable member 44 of the upper clamp wedge 34 is pushed upward by the friction plate 52, and the wedge 34 releases the clamp on the cable.

The cable is thus allowed to slide freely inside the upper clamping wedge 34, and the lower clamping wedge 36, which is pulled upwards by the two hydraulic cylinders 50, pulls on the cable 1 being clamped and at the same time It will also pull up the suspended load. It then returns to the initial arrangement shown in FIG.

This cycle is repeated intermittently as many times as necessary, in increments equal to the maximum extension of the hydraulic cylinder 50, until the load reaches the desired height.

Furthermore, the illustrated linear winch 12 is equipped with hydraulic locking jacks 62.64 that lock the inner movable members 44.54 of the upper and lower clamping wedges 34, 36 when they are not moving. ing. The hydraulic locking jacks 62, 64 are used during unloading, and their operation is synchronized with the mutual movement of the pistons of the hydraulic cylinder 50, so that the screw 1 of the hydraulic cylinder 50 automatically closes during the mutual movement. It is controlled by an electronic circuit that turns it on and off.

Pressurized hydraulic fluid is required to operate the hydraulic cylinder 50 and hydraulic stationary jacks 62, 64. The power unit 18 outputs pressurized hydraulic fluid to 0.
68 feeds the cylinder and an output 70 feeds the hydraulic fixed jacks 62,64.

As can be seen from the above description, the linear winch provides pulling force intermittently. That is, the hydraulic cylinder 5
The cables 24.26 are intermittently pulled and held in place until the clamping wedges 34.36 return to their initial positions. In order to make the pulling action as smooth as possible, a linear winch 12.
It is necessary to integrate the operation of each of the 14 hydraulic cylinders 50. Without this integration, g2 of load 32 would be pulled while the other end remained stationary, and vice versa.

In order to achieve this integration of the lifting movements, position detection means are provided for detecting the movement of the hydraulic cylinders 50 of each linear winch 12, 14.

For example, this position detection means can be constructed by providing a plurality of limit switches. When detecting the movement of the hydraulic cylinder 50, the limit switch may be placed either inside or outside the cylinder section. When a limit switch is disposed inside the cylinder part, a waterproof limit switch may be used, and in this case, the limit switch is directly driven by the piston. Also, when placing a limit switch outside the cylinder,
A magnetically activated limit switch may be used as the limit switch, a magnet may be embedded in the piston, and the movement of this magnet may be detected by the limit switch.

In the embodiment of FIG. 1, limit switch 72 is positioned to activate when the hydraulic cylinder is fully depressed, and limit switch 74 is activated when the hydraulic cylinder is fully extended. located at the location.

Furthermore, the hydraulic cylinder 50 has a limit switch 76.
．． 78 are provided, each with a limit switch 7
It is placed slightly in front of 2.74. In this example, the hydraulic cylinder 50 has a stroke of about 81 cm (about 2 inches). Therefore, limit switches 74 and 72 are approximately 81α (approximately 2 inches) apart. In this state, limit switches 76 and 78
is approximately 7.5011 of the limit switches 72 and 74.
(approximately 3-2/1 inches) forward. Therefore, limit switches 76 and 78 are limit switches 72
．． It is tripped slightly earlier than 74.

The electrical signals generated by these limit switches are input to the programmable controller 80. A programmable controller 80 controls the power unit 18 and limits the flow of hydraulic fluid into the linear winch 12.14 v1. The power unit 18 is manufactured by French company GT Hydraulics of Sanoa (GT oydrau+r).
It can be purchased from que of 5 annois). The power unit 18 also has valves and a hydraulic pump which serve to supply hydraulic pressure to the dual linear winch drive with the storage reel 20.22. The programmable controller 80 is manufactured by Giddings and Lewis of the United States.
The PC48 is available from D Lewis. The programmable controller 80 is programmed to control the power unit 18 by software provided as an accessory to the controller.

This program causes programmable controller 80 to operate solenoids that control a plurality of pulps that control the flow of pressurized hydraulic fluid into and out of linear winches 12, 14 in both directions.

FIG. 4 shows an example of a program of this programmable controller 80. First, the programmable controller 80 gives a command to the power unit 18 to supply hydraulic fluid to the cylinder chamber on one side of the piston of the hydraulic cylinder 50. When the supply of hydraulic fluid is started, the hydraulic cylinder 50 is expanded or compressed to a predetermined extent, and the grammar pull controller 80 activates the limit switch 7.
Upon receiving the signal issued from 6 or 78, programmable controller 80 initiates deceleration of the cylinder.
commands the power unit 18 to gradually reduce the fluid flowing into the hydraulic cylinder 50. Thereafter, when the piston moves further and limit switch 72 or 74 is actuated and limit switch 72 or 74 generates a stop signal, programmable controller 80 stops fluid flow to hydraulic cylinder 50 in response to the stop signal.

The programmable controller 80 then waits for a stop signal from the limit switch 72 or 74 of the linear winch in use before supplying hydraulic fluid to the opposite side of the piston of the hydraulic cylinder 50 to begin reverse operation. This is to ensure that neither winch can begin the next process unless the other winch has completed its cycle. When a stop signal is output from both linear winches, the programmable controller 80 initiates the next cycle to cause the hydraulic cylinders to perform a reverse operation. In this manner, the pulling motions of linear winches 12 and 14 are maintained in unison so that neither end of load 32 moves out of sync with the motion of the other end.

[Effects of the Invention] According to the present invention, since the first and second linear winches are controlled by a microprocessor, the operations of the first and second linear winches can be easily integrated and the load can be distributed almost uniformly. It can be raised or lowered in increments.

[Brief explanation of drawings]

Figure 1 shows -
FIG. 2 is a schematic diagram showing electrical wiring between a set of intermittent linear winches and a power unit. FIG. 2 is a schematic diagram without showing the arrangement of the linear winch with respect to the load. FIG. 3 is a schematic front view of a linear winch used in the present invention. FIG. 4 is an example of a program flowchart. 10...Dual linear winch, 18...Power unit, 12.14...Linear winch, 24°2
6... Cable, 32... Load, 34.36...
Clamp wedge, 50...Hydraulic cylinder, 52...
・Friction plate, 72.74...Limit switch,
76°78...Limit switch, 80...Programmable controller. @2 Figure 3

Claims (7)

[Claims] (1) In a dual linear winch used for lifting and lowering a load, the first linear winch has a cable gripper that is connected to the load via a cable and reciprocates when supplied with power; a second linear winch having a cable gripper that reciprocates when connected and powered; and providing power for the reciprocating movement and gripping operation of the cable grippers of the first and second linear winches; power supply means; said first and second linear winches for monitoring said reciprocating motion of said first and second linear winches and controlling output from said power supply means to said first and second linear winches; A dual linear winch comprising a second linear winch and a programmable controller connected to the power supply means. (2) The first and second linear winches are hydraulic, the power supply means supplies pressurized hydraulic fluid to the first and second linear winches, and the programmable controller is configured to supply the power to the first and second linear winches. A dual linear winch as claimed in claim 1 for controlling the flow of pressurized hydraulic fluid into and out of the supply means. (3) The dual linear winch according to claim 1, further comprising hydraulic cylinder means for causing the first and second linear winches to perform reciprocating motion. (4) position detection means interlocked with the hydraulic cylinder means for detecting the position of the hydraulic cylinder means while the hydraulic cylinder means reciprocates; the programmable controller is connected to the position detection means and the programmable controller is connected to the position detection means; 4. The dual linear winch according to claim 3, wherein said power supply means is controlled in accordance with the detected position of the hydraulic cylinder means. (5) The programmable controller is configured to
The dual linear winch according to claim 1, wherein the first linear winch and the second linear winch perform reciprocating motions that substantially coincide with each other. (6) In a dual linear winch used for lifting and lowering a load, the first linear winch is connected to the load via a cable and has hydraulic cylinder means for causing a cable gripper to reciprocate; and a first linear winch is connected to the load via a cable. a second linear winch having hydraulic cylinder means for causing the cable gripper to reciprocate; power supply means for supplying pressurized hydraulic fluid to the first and second linear winches; the first and second linear winches and the power supply means for monitoring the reciprocating motion of the second linear winch and controlling the flow of pressurized hydraulic fluid into and out of the power supply means; A dual linear winch characterized by having a connected programmable controller. (7) position detection means interlocked with the hydraulic cylinder means for detecting the position of the hydraulic cylinder means while the hydraulic cylinder means reciprocates; the programmable controller is connected to the position detection means, and the programmable controller is connected to the position detection means; 7. The dual linear winch according to claim 6, wherein the power supply means is controlled in accordance with the detected position of the hydraulic cylinder means.