JPS6231694A - Indicator for braking force of 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 Field of the Invention The present invention relates to a device for indicating the braking capacity generated in response to a brake operating force applied to a band brake type winch.

Prior Art In conventional manual and band brake type winches, when applying the brake by operating the brake handle, there is no display device that allows the operator to know the operating force and braking capacity at that time. As one method for measuring the capacity, as shown in FIG. At the top, the hydraulic pressure generated by the foot-operated hydraulic pump 21 is guided to the jack 25, and the pressure at which the brake slips is read with the gauge 22, and the limit of the braking capacity of this winch is calculated. The equipment is expensive, dangerous and impractical. Therefore, when operating such a winch, it is necessary to rely entirely on the intuition gained from the operator's experience, or to carry out multiple inspections and inspections.
Safety was confirmed through tightening work and other measures. For the purpose of slightly stabilizing the braking force, a collar 2 is fixedly mounted on the brake par 27 with a handle as shown in Fig. 7.
Some brakes are designed to maintain a stable braking force by inserting a spring 29 between the brake pad and the trunnion 26 and tightening the brake band via the spring 29.

Problems to be Solved by the Invention The capacity of the band type brake on a winch increases or decreases in proportion to the force that tightens the brake band to the brake drum due to the rotational force of the brake bar. In order to be more sensitive to the operator's feelings, we must be conscious of safety, and since the brake bar must be rotated with more force than necessary, it is laborious and the brake system must be given enough strength to handle the excessive force. must be kept.

Also, depending on the purpose of use of the winch, it is often safer and more advantageous to avoid wire lobes being slightly unwound when excessive lobe tension is applied unexpectedly by an external force, causing breakage of the wire lobes and damage to the winch and other parts. However, all adjustments to the brake force at this time were carried out by experienced workers, but it was extremely difficult to complete the work completely, and even when this adjustment was successful, the wire lobes were unwound several times. If this happens, the predetermined braking force cannot be maintained due to a decrease in the friction coefficient of the friction parts, so inspection and adjustment are often required. 31 like this! We have installed an indicating device that displays the set value of the winch's braking force, so that it is safe, reliable, and easy to set by operating the brake while visually checking the device, without having to worry about the roughness and inconvenience that only experienced workers can feel. This allows braking force to be maintained over a long period of time.

action In Figure 5 G: Brake drum diameter D: Center effective diameter of the wire lobe wound around the winch drum μ: Coefficient of friction between brake drum and brake lining α: Effective winding of the brake band is at an angle e; base of natural logarithm T, ; Tension on the active point side of the brake band A, wire rope payout tension Then, the braking force P on the brake drum.

The minimum required braking force P1 on the circumference of the brake drum to maintain the tension of the wire lobe is pt+(e
1) P ruled line-Ill-D/G
The tension T1 on the brake band active point side such that 1p=p is expressed by the following equation.

Tl-111・D/G -1/(6"-1) Generally, winches equipped with a manual band type brake reduce manual force and exert a large braking force, as shown in Figure 1 or Figure 5. In order to do this, a connecting rod with a lever ratio of 1, t + L+ is used.The required force W of the brake bar to generate the braking force P at this time is
is W=r, ·L, /L.

Therefore, W−L ”D/G ′L+/Lx −1/(e
” -1) In the above formula, for winches with the same specifications, D/
G.

Since L+/Lx and 1/(e"-1) are constant constants, in order to exert a braking force commensurate with the tension of the wire lobe, the handle 8 may be rotated with a force proportional to the tension of the wire lobe.

Now, by turning the handle 8 and applying force to the point of application of the connecting plate 5 through the indicating device of the present invention using the screw at the tip of the brake bar 9, the brake will be applied. The amount of compression of the spring according to the load penetration is displayed on a scale. On this scale, the braking force of the brake device corresponding to the compressive repulsion force of the spring is calculated in advance from the above-mentioned formula and is engraved, so that the predetermined braking force can be freely selected and set. can.

In addition, the scale provided on the brake force indicating device has a dedicated scale for each layer of the wire lobes wound on the wire drum, so that the braking force can be selectively and accurately applied regardless of the length of the wire lobes being fed out. Can read power.

Example Embodiments of the invention will be described with reference to the drawings.

In Fig. 1, 1 is the bed or deck on which the winch equipment is attached, 2 is the bracket that supports the reaction force of the brake device, 3 is the tension bar, and 4 is the brake lining that supports the lower brake band 7 when the brake is released. 6.7 is the brake band, 5 is the connecting plate that constitutes the link device of the booster mechanism,
It has a pin hole b for connecting the end of the brake band 7 on the active point side, a pin hole c for connecting the end of the brake band 6 on the dead center side, and a hole d for inserting the shaft of the runner 10. A handle 8 is fixed to one end of the brake bar S9, and the other end is a threaded portion a, which is pivotally supported by a bracket 14 on the brake band 6 and is screwed into a female threaded portion of a female threaded pin 15. In the middle part, as shown in FIG. 2, a bowl-shaped spring outer case 12 fixed to the brake bar 9 and a bowl-shaped spring inner case 13 having a trunnion 10 are attached to the disc spring 1.
When the brake bar 9 is rotated in a certain direction by the handle 8, the thrust of the screw a is applied to the spring outer case 12 side, and the disc spring 16, spring inner case 13,
The connecting plate 5 is rotated in the direction of the arrow via the trunnion 10 around the pin hole C, and this force applies tension to the active point side of the brake band 7, generating a braking force.

In addition, 11 is a collar fixed on the brake bar 9 to release the brake. It serves to forcefully return the connecting plate 5 during operation.

On the other hand, on the outer periphery of the spring inner case 13 of the brake force indicating device A, as shown in the exploded view in FIG. The compression deflection position is calibrated to match the end surface e of the spring outer case 12.

The wire lobes wound around the winch drum can range from 1 layer to 21i as the stock length increases! 'The effective diameter of the wire lobe winding gradually increases with three-layer winding, but since the outer diameter of the brake drum remains constant, a gradually larger braking force is required even though the tension of the wire rope does not change.

Therefore, the scale B mentioned above is not a single scale, but a dedicated scale with different intervals for each layer.

Based on the above structure, when trying to apply the desired braking force to the winch, first check the number of layers of wire rope wound around the winch drum, and then When the handle 8 is turned until the straight line of the outer peripheral end surface e of the outer case 12 coincides with the desired brake force indication line 13, the desired brake force is obtained in that state.

Next, a second embodiment of the brake indicating device A is shown in FIG.

In the first embodiment shown in FIG. 2, the spring outer case 12 is fixed to the brake bar 9, whereas the brake bar is designed to reduce the rotational resistance of the handle 8 so that the brake can be easily adjusted. In contrast to the collar 17 fixed to the brake bar 9, the collar 17 is fixed to the brake bar 9 to reduce the rotational resistance of the handle 8 and make it easier to adjust the brake, and the collar 17 and the spring outer case A thrust bearing 18 is inserted between the spring outer case 12 and the outer spring case 12 so that only the axial thrust of the brake par 9 is transmitted to the spring outer case 12.

Note that the structure of the brake force indicating device A of the present invention is not limited to that shown in the first and second embodiments.
There are various methods such as using a coil spring instead of a disc spring, separating the spring inner case 13 and trunnion 10, and changing the insertion position of the thrust bearing 18, but the key is to reduce the axial thrust of the brake par 9. , is transmitted to the trunnion 10 via the spring, and a scale is provided so that the spring pressure m and deflection at that time can be converted into braking force and read.

Effects of the Invention By using the brake force indicating device for a winch according to the present invention, when generating the required brake force, the worker can simply check the scale without considering the skill or feeling of the operator. All you have to do is turn the handle until the indicator line lines up with the position, and anyone can set a reliable braking force without overdoing it, so you can avoid overloading the brake mechanism. , it is also possible to rationalize the design strength.

Also, when a shocking external force is applied to a wire rope that has been let out from a winch and stretched, such as when mooring a ship,
By adjusting and maintaining the braking force at a level that provides the necessary rope tension for mooring under normal conditions, even when there is a sudden increase in tension, the wire rope will be unwound and absorb the impact, so the wire rope will remain stable. In addition to helping to prevent dangers such as cutting and damage to the winch mechanism, the application of braking force uses a spring to apply tension to the brake band, which prevents the lining from bending or parts from wearing out to some degree during use of the brake. It is also possible to maintain stable braking force.

[Brief explanation of drawings]

Fig. 1 is a side view showing the winch and brake mechanism equipped with the brake force indicating device of the present invention, Fig. 2 is a detailed sectional view of section A in Fig. 1, and Fig. 3 is an expanded scale of section B in Fig. 2. Figure, 4th
The figure is a sectional view showing another embodiment of the brake force indicating device;
FIG. 5 is an explanatory diagram of a brake force calculation formula, FIG. 6 is a schematic diagram of brake force measurement, and FIG. 7 is a side view showing an embodiment of a conventional winch brake mechanism. that's all

Claims (2)

[Claims] (1) In a wire rope winding unit equipped with a manual brake device, bowl-shaped springs fitted facing each other apply the axial thrust of the brake operating handle shaft to the force point of the connecting plate that operates the active point side of the brake band. The braking force is applied to the outer periphery of the inner fitting side of the spring case through a spring housed in the case, and the braking force generated in accordance with the amount of compressive deflection of the spring is applied to the outer periphery of the inner fitting side of the spring case. A winch brake force indicating device featuring a scale that can be read on the end surface. (2) The brake of the winch according to claim 1, in which the brake force indicating scale provided on the outer periphery of the spring case is independently arranged with a dedicated scale corresponding to the effective winding diameter of the wire rope wound on the winch. Force indicating device.