JPS636479B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a winding trunk device for winding up or unwinding cables such as wire ropes for cargo handling work.

[Conventional technology]

Generally, winding trunk devices such as winches are often used fixed on the ground, but the amount and angle of winding or unwinding of the cable vary widely depending on the conditions of use. Because it is often used with a pulley interposed in the middle,
It is difficult to provide an overwind prevention device that stops the power source in response to a cargo handling hook or the like at the tip of the cable. This over-winding prevention device can be configured to respond to the winding outer diameter of the cable wound around the winding drum, but if the rope is wound around the winding drum randomly, Since the outer diameter and the amount of winding do not correspond, and the limit amount of winding varies depending on the position of the pulley provided in the middle, the purpose of the overwinding prevention device cannot be fully achieved. However, if an overwinding prevention device is not provided, the power can only be stopped by the operator's operation, and if there is no operation to stop the power even at the rope winding limit, the cable will be locked and the power (generally Electric motors) generate locking torque, which can destroy the suspended load, pulley, or hoisting device itself, or overload the cables, shortening their lifespan or causing them to break.

In order to eliminate this problem, a friction coupling means such as a slip clutch is interposed in the winding drum drive system, and when the cable is locked, this friction coupling means generates a slip in the drive system to prevent winding. A winding trunk device has been proposed which limits the cable winding force of the trunk.

FIG. 1 is a longitudinal sectional front view of the friction coupling means portion of such a conventional winding drum device, in which a drive shaft 1 connected to a power source is connected to bearings 4, 5 by frames 2,
It is rotatably supported via. Reference numeral 6 denotes a winding drum having a cylindrical shape with a bottom and flanges 6A and 6B at both ends of the outer periphery, the bottom of which is rotatably supported relative to the drive shaft 1. Reference numeral 7 denotes a winding drum drive plate, which is supported by a key 8 relative to the drive shaft 1 so as to be non-rotatable and movable in the axial direction. The outer peripheral end of the collar 6B is bent axially outward, and a driven lining 9 having a conical inner surface is provided inside this bent portion. A drive lining 10 having a conical outer surface is provided on the outer periphery of the winding drum driving plate 7, and the winding drum driving plate 7 is pressed in the direction of the winding drum by a chrysanthemum nut 11 screwed onto the drive shaft 1 via a disc spring 12. By doing so, both the linings 9 and 10 are brought into pressure contact and the driving force of the drive shaft 1 is frictionally transmitted to the winding drum 6. The maximum value of this frictional transmission force is determined by the area and friction coefficient of the contact surfaces of the linings 9 and 10, and the magnitude of the contact pressure caused by the disc spring 12. Slip occurs on the surface. Therefore, when the cable 13 wound around the winding drum 6 is locked, the force acting on the cable 13 is limited to the winding force due to the maximum frictional transmission force.

[Problem that the invention seeks to solve]

However, in such a winding drum device, it has not been possible to increase the contact area between the lining 9 and the drive lining 10 due to its structure, and therefore, if a material with a large friction coefficient is used, the thermal characteristics will be unstable and slipping may occur. The friction coefficient of the linings 9 and 10 is drastically reduced due to the frictional heat, and there is a danger that the transmitted force will be drastically reduced and the suspended load will accelerate and fall. Further, since the winding drum 6 is made of cast metal, it is expensive. Furthermore, no consideration was given to a safety mechanism when the winding drum rotates at a predetermined rotational speed or higher.

[Means for solving problems]

The present invention has been made in order to solve such problems, and the present invention has been made to solve this problem.
, a winding drum 35 that is arranged concentrically around the drive shaft 34 and is rotatably supported relative to the drive shaft 34;
and a friction connecting means for connecting the wire rope 36 and the like in the rotational direction by a friction surface, and by rotating the winding drum 35, a cable such as a wire rope 36 is wound or unwound on the outer periphery of the winding drum 35. In the drum device, the winding drum 35 has a cylindrical shape with a bottom, and is made by concentrically joining the bottoms of two winding drum materials 35A and 35B of the same shape, each of which is formed by drawing a steel plate so that a flange is formed at the opening edge. and is rotatably supported relative to the drive shaft 34, and the friction coupling means is disposed within the inner space of one of the winding drum blanks 35A and is connected to the drive shaft 34.
a clutch plate 43 which passes through the winding drum 35 in a relatively rotatable manner and whose outer periphery engages with the winding drum 35 in a relatively non-rotatable and axially movable manner; a clutch wheel 42 which is arranged rotatably relative to the clutch wheel 42 and through which the drive shaft 34 passes through in a relatively non-rotatable manner; and an axial pressing means which presses opposing surfaces of the clutch plate 43 and the clutch wheel 42; The winding trunk 35 is placed between the bottoms of the two winding trunk materials 35A and 35B.
The winding drum device is characterized in that a centrifugal element 39 is provided to disable relative rotation between the drive shaft 34 and the winding drum 35 when the winding drum rotates at a predetermined rotational speed or higher. be.

[Effect]

According to this winding drum device, the winding drum materials 35A and 35B of the winding drum 35 are formed by drawing a steel plate, so that they can be made cheaper than those made of castings. In this case, the winding body elements 35A and 35B have a cylindrical shape with a bottom and a flange is formed at the opening edge, so that they have sufficient strength even if they are made of steel plates. Moreover, since the bottoms of the winding drum materials 35A and 35B are concentrically connected, the winding drum 35
Since the bottoms of the two winding trunk materials 35A and 35B are located at the center of the cylinder, the strength of the center of the cylinder can be ensured. In addition, two rolled trunk materials 35A,
35B have the same shape, only one mold is required, and the produced winding drum materials 35A and 35B can be easily managed.

Further, a centrifugal element 39 is provided between the bottoms of the two winding drum materials 35A and 35B so as to prevent relative rotation between the drive shaft 34 and the winding drum 35 when the winding drum 35 rotates at a predetermined rotational speed or higher. is provided, so a safety function can be provided with a very simple configuration.

Moreover, since the clutch wheel 42 and the clutch plate 43, which are the components of the friction coupling means, are housed in the inner space of the winding drum material 35A, the space utilization efficiency is good, and the number of overlapping sheets can be increased to increase the friction transmission force. However, the overall size of the device does not need to be increased.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. FIG. 2 is a partially cutaway side view of the winding drum device;
Figure 3 is a cross-sectional plan view, Figure 4 is an enlarged view of the main parts,
FIG. 5 is a cross-sectional view taken from FIG. 4, and FIG. 6 is an exploded perspective view of the main parts. In the drawings, frames 21, 22
are connected at regular intervals by stud bolts 23A to 23E, and bases 24 and 25 are connected to the stud bolts 23C at the lower ends of the frames 21 and 22, respectively.
It can be installed using ~23E. A drive motor 26 that passes through the frame 21 is fixed inside the frame 22, and an output shaft 26A passes through the frame 22 and projects into the reducer cover 27. The reduction gear cover 27 is fixed to the outside of the frame 22 by bolts 28A to 28D, and accommodates reduction gears 29A, 29B, and 29C. The input gear of the reduction gear 29A is the output shaft 26A.
The output gear meshes with the next stage reduction gear 29B. Furthermore, this reduction gear 29A has a pawl wheel 31 that engages with a pawl 30, and has a mechanical brake function that absorbs reverse driving force from a suspended load. The end of the drive shaft 34 supported by the frames 21 and 22 via bearings 32 and 33 protrudes into the reduction gear cover 27, and the final stage reduction gear 29C is fixed to this protrusion. The winding drum 35 has a cylindrical shape with a bottom, and the bottoms of two winding drum materials 35A and 35B, which are formed by drawing a steel plate so that a flange is formed at the opening edge, are concentrically connected by bolts 35D to 35F via a supporter 35C. It is composed of a combination of . Rolling body material 3
The drawing process of 5A and 35B creates a curve between the cylindrical part and the bottom part, and when the bottom parts are directly joined together, a groove with a triangular cross section is created at the joint. The outer peripheral edge of the supporter 35C has a widening shape along the curved surface to reduce the occurrence of the triangular groove, and the outer peripheral surface is the winding surface of the wire rope 36 together with the outer peripheral surface of the cylindrical portion of the winding trunk materials 35A and 35B. becomes. Rolling body material 3
A fitting hole 35G is formed at the center of the bottom of 5A, 35B and the center of the supporter 35C.
The winding area of the spline boss 37 has a large diameter, and the outer circumferential protrusion 37A of the spline boss 37 is narrowed at the bottom of the winding drum blanks 35A, 35B, so that the winding drum 35 is rotatably connected to the spline boss 37. Supporter 35C
There is a bulge 35G-1 of the fitting hole 35G, in which a centrifuge 39 rotatably supported at the bottom by a pin 38 is accommodated. This centrifugal element 39 is rotated by a torsion spring 40 so as to be in the state shown by the solid line in FIG. The claw part 3 rotates as shown by the broken line due to force.
9A engages with the notch 37B of the spline boss 37, making it impossible for the winding drum 35 to rotate relative to the spline boss 37 in the rope unwinding direction. The drive shaft 34 is formed with a flange 34A, a straight tooth spline 34B, and a thread 34C.
A collar 41, a clutch wheel 42, a clutch plate 43, a disc spring 44, a spline boss 37, and a chrysanthemum nut 45 are attached. The clutch wheel 42 has a spline hole 42A in its center, and engages with the spline 34B through a small gap so that it is relatively non-rotatable and movable in the axial direction. It is possible to rotate. The clutch plate 43 has a through hole 4 in its center.
3A, and is fitted to the outer periphery of the spline 34B with a small gap so as to be relatively rotatable and movable in the axial direction. Projection 35A-1,
It has a notch 43B that engages with 35A-2 in a relatively non-rotatable but axially movable manner through a small gap. This clutch wheel 42, clutch plate 4
No. 3 is a punched steel plate which is heat treated such as sulfonitriding treatment to increase wear resistance and lubricity, and a plurality of sheets are polymerized in the axial direction. A disc spring 44 fitted around the outer periphery of the spline 34B presses the clutch wheel 42 and clutch plate 43 between it and the collar 41, and the drive shaft 34 is rotated by the frictional force of the pressure contact surfaces of the clutch wheel 42 and clutch plate 43. Winding power torso 3
5. The pressing force by the disc spring 44 is adjusted by changing the axial position of the spline boss 37 by rotating a chrysanthemum nut 45 screwed into the screw thread 34C. The frame body 21 is expanded into the internal space of the winding drum material 35B, and a recessed space 21A formed on the outside thereof is covered with a cover 47 equipped with an electric control circuit 46 for controlling the drive motor 26. The control circuit 46 is accommodated within the space 21A by covering it with a.

In the above configuration, when the device is in a normal operating state, the winding drum 35 is rotated in the normal direction by the normal rotation of the drive motor 26 to wind up the wire rope 36;
By reversing the drive motor 26, the winding drum 35 is reversed and the wire rope 36 is unwound to carry out cargo handling work. From the drive shaft 34 at this time to the winding drum 35
The rotational force is transmitted to the clutch wheel 42 that engages with the spline 34B and the protrusions 35A-1 and 35A.
-2 depends on the frictional transmission force of the clutch plate 43 that engages with the clutch plate 43.

When the wire rope 36 is locked due to overwinding, a slip occurs between the clutch wheel 42 and the clutch plate 43, and the transmission force is limited. The wire rope 36 is never overloaded. Frictional heat is generated on the friction surfaces of the clutch wheel 42 and the clutch plate 43 due to the slippage in this overwound state, but the clutch wheel 42
Since the clutch plate 43 is a heat-treated steel plate, the coefficient of friction is stable against a rise in temperature, and the friction transmission force will not suddenly decrease and the suspended load will not accelerate and fall.

Since the winding drum materials 35A and 35B of the winding drum 35 are made by drawing a steel plate, they can be made cheaper than those made of cast iron. In this case, the winding drum materials 35A and 35B have a cylindrical shape with a bottom and a flange is formed at the opening edge, so that they have sufficient strength even if they are made of steel plates. Moreover, since the bottoms of the winding drum materials 35A and 35B are concentrically joined, the bottoms of the two winding drum materials 35A and 35B are located at the center of the cylinder, so that strength can be ensured. Also,
Since the two winding trunk materials 35A, 35B have the same shape, only one mold is required, and the manufactured winding trunk materials 35A, 35B can be easily managed.

When operating under even more severe load conditions, the load cannot be supported by the frictional force between the clutch wheel 42 and the clutch plate 43, and the winding drum 35 is reversely driven by the suspended load and falls at an accelerated rate. It is possible to do so. However, when the rotational speed of the winding drum 35 reaches a predetermined value, the centrifugal element 39 rotates due to centrifugal force and engages the claw portion 39A with the notch 37B of the spline boss 37, causing the winding drum 35 to move relative to the drive shaft 34. Relative rotation is disabled and braking force can be applied by the drive shaft 34, improving safety. Such a centrifugal element 39 has two winding drum materials 35.
Since it is provided between the bottoms of A and 35B, a safety function can be provided with a very simple configuration.

On the other hand, the clutch wheel 42 and the clutch plate 43, which are the components of the friction coupling means, are housed in the inner space of the winding drum material 35A, so the space utilization efficiency is good, and the number of overlapping plates can be increased to increase the friction transmission force. However, the overall size of the device does not need to be increased.
Furthermore, the winding drum 35, clutch wheel 42, clutch plate 43, etc. can be assembled onto the drive shaft 34 to form a unit, thereby improving assembly efficiency.
Furthermore, the support 35C reinforces the bottoms of the winding drums 35A and 35B to prevent the winding drums 35 from tilting due to unbalanced loads. Further, the inner and outer peripheral edges of the clutch plate 43 are connected to the outer periphery of the drive shaft 34 and the winding drum material 35 at minute intervals.
Since it faces the inner periphery of A, it provides support against the inclination of the winding drum 35, and has the effect of limiting the amount of inclination of the winding drum 35. This effect is due to the clutch wheel 42
This can also be achieved by bringing the outer peripheral edges of the ridges close to the protrusions 35A-1 and 35A-2.

Furthermore, a frame body 21 is placed in the inner space of the winding body material 35B.
Since the bearing 32 is supported by a bulge, the drive shaft 34 is shortened, which is advantageous in terms of strength, and the electrical control circuit 46 is accommodated by utilizing the recessed space 21A formed by this bulge. As a result, the protrusion of the control circuit 46 can be eliminated and the size can be reduced, and the control circuit 46 can be protected from external forces.

〔Effect of the invention〕

According to the present invention, it is possible to provide a winding drum device that can be made compact with stable performance, has high strength at low cost, and can have a safety function with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of the friction coupling means of a conventional winding drum device, FIG. 2 is a partially cutaway side view of the winding drum device of the present invention, FIG. 3 is a cross-sectional plan view thereof, and FIG. Figure 3 is an enlarged view of the main parts, and Figure 5 is an enlarged view of Figure 4.
The sectional view and FIG. 6 are exploded perspective views of essential parts. 34... Drive shaft, 35... Winding drum, 35A, 3
5B... Rolling trunk material, 36... Wire rope, 3
9...Centrifugal element, 42...Clutch wheel, 43
...Clutch plate, 44...Disc spring.

Claims (1)

[Claims] 1. A drive shaft 34 driven from a power source, and a drive shaft 34 arranged concentrically around this drive shaft 34.
The winding drum 35 is rotatably supported relative to the winding drum 35, and a friction coupling means for connecting the drive shaft 34 and the winding drum 35 with a friction surface in the rotation direction, and the winding drum 35 is rotated. Possibly the winding drum 35
In a winding drum device that winds up or unwinds a cable such as a wire rope 36 on the outer periphery, the winding drum 35 has a cylindrical shape with a bottom and is formed by drawing a steel plate so that a flange is formed at the opening edge. It is constructed by concentrically joining the bottoms of two winding drum materials 35A and 35B of the same shape, and the drive shaft 34
The friction coupling means is disposed within the inner space of one of the winding drum blanks 35A, and the drive shaft 34 passes through the shaft so as to be relatively rotatable, and the outer peripheral edge thereof is rotatably supported by the friction coupling means. A clutch plate 43 is engaged with the winding drum 35 so as to be relatively non-rotatable and movable in the axial direction; A clutch wheel 42 that passes through the clutch wheel 42 in a non-rotatable manner, and an axial pressing means that presses the opposing surfaces of the clutch plate 43 and the clutch wheel 42, and the two winding drum materials 35A,
A centrifugal element 39 is provided between the bottom of the winding drum 35B so as to disable relative rotation between the drive shaft 34 and the winding drum 35 when the winding drum 35 rotates at a predetermined rotational speed or higher. A winding drum device featuring: