JPS60191995A - Auxiliary brake gear for winding machine - 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 Application of the Invention] The present invention relates to an auxiliary brake device for a hoisting machine. In particular, the present invention relates to an auxiliary brake device for a hoisting machine that performs reliable braking, has high productivity, and is inexpensive.

[Background of the invention]

As related to the prior art of this type of brake device, for example, Japanese Patent Application Laid-Open No. 55-14 related to Japanese Patent Application No. 53-85193
There is a centrifugal brake device described in Publication No. 331.

Its schematic structure is shown in FIG. 1, which is a cross-sectional view of a typical wheel hoist, and in FIG. 2, a cross-sectional view of the auxiliary brake device.
This will be explained with reference to FIG. 3, which is an explanatory diagram of the principle, and FIGS. 4 and 5, which are explanatory diagrams of the normal state and operating state of the centrifugal piece.

In Figure 1, 1 is the main brake, 2 is the hoisting motor (hereinafter referred to as the motor), 3 is the low tome, 4 is the connecting shaft, 5 is the main body frame, and 6 is the deceleration The device 7 is a safety brake related to an auxiliary brake device;
8 is a braked shaft.

As shown in FIG. 2, the configuration of the safety play gear is such that a centrifugal piece support 14 is fixed to one end of the braked iQl+s supported by a bearing 9, and a ring spring 16 is attached to the outer periphery of the centrifugal piece support 14. As shown in Figures 4 and 5, the centrifugal piece 15
is installed.

When the centrifugal force of the restraining force field of the ring spring 16 is applied due to an improvement in the rotational speed of the braked shaft 8, the long-haul piece 15 protrudes as shown in FIG. It contacts the provided brake 7 and applies rotational force to the brake/knee 17 by frictional force.

As shown in FIG. 3, this play gear knee 17 has a slope 17. ] is formed, and a slope 18a is also formed on the brake cover 18 facing this.

Therefore, the brake knee 17 bends the slope 18a in the direction of the arrow shown by the rotational force, moves to the right in the figure, and presses the brake wheel 12 to apply braking. It is something.

Thus, the illustrated return spring 19 is similar to the brake shoe 17.
When the hoist is in a free state, a weak restraining force is applied to prevent the hoist from acting involuntarily due to vibrations during hoist operation. However, the plate spring 10 is provided for the purpose of buffering the impact of the braking force applied to the brake wheel 12.

In addition, 11 is the brake valve, 13 is the brake case,
20 is a bolt.

This conventional example does not have any drawbacks in terms of functionality, but the functions of these configurations are as follows:
In Figure 1, if the main brake 1 fails or if the
This is a case where the shaft 4 is damaged and the braked shaft 8 rotates at high speed due to the falling blade of the load.
In short, this is something that should come into play in the unlikely event of an unexpected situation.

In this way, despite trying to prepare for the worst case scenario, dl,
It can be said that the configuration has become complicated and the cost has become expensive.

In addition to the above, as a conventional example, Patent No. 541
There is one related to No. 699 (Special Publication No. 43-22709).

An overview of this conventional example is shown in Fig. 6, a sectional view, Fig. 7, a side sectional view, the 8th rotation, a partially opened sectional view of the rotating body, and 9th and 1st sectional views.
The explanation will be based on the principle explanatory diagram of FIG.

Its structure includes drum brakes 32'A and 32'B to which braking force is applied in advance built into the inner peripheral surface of the drum 31, and a cage 34 which is a rotating body within a reduction mechanism 33 using a JL star gear. The ratchet 35 is provided with a ratchet 35, and when the rotation speed exceeds a certain level, the ratchet 35 flies out due to centrifugal force and is coupled to the drum brake 32A, and in such a case, the rotation of the cage 34 is braked. It has a structure that allows

In this conventional example, the drum brake 32
The braking force of A, 13 is generated only by pressing the outer circumferential surface of the brake against the inner circumferential surface of the drum 31, and consists of two drum brakes 32A, 32B and connecting parts. has a complicated component configuration in which the deflection and pushing force of the disc spring 36 is adjusted by an adjustment bolt 37.

Still disc spring 36 in the circumferential direction. Since the adjusting bolt 37 is incorporated, the diameter of the disc spring 36 is limited, and a disc spring 36 with little deflection and high force is required.

Therefore, when adjusting the braking force, it is necessary to adjust minute dimensions and measure and confirm the braking force, which is extremely difficult.

Further, the force with which the ratchet 35 is pushed out due to the rotation of the cage 34 is determined by the centrifugal force F=mrω2, and the smaller the rotational speed ω, the smaller the force becomes smaller by the square of the smaller ratio. Here, 11] is the mass of the ratchet 35, and r is the radius of rotation.

For example, the cage 34 decelerated by the deceleration mechanism 33
However, compared to the first stage shaft 38 before being decelerated, if the rotation speed ratio (reduction ratio) is now 1:5, the centrifugal force F is 1:
25, which is very small compared to the 1st stage shaft 1.38 parts, and in order to set this small force, the ratchet 35
Variations in the mass of the ratchet spring 39, variations in the force of the ratchet spring 39, etc. have a large effect on a small centrifugal force, and in order to set the operating rotation speed of the ratchet 35, fine adjustment of the ratchet spring 39 is required. This adjustment was also extremely difficult.

Furthermore, the ratchet 35 is coupled with the drum brake 32A only once during one rotation of the cane 34, and if it is not coupled, it is rotated one more time, and during this period there is one step. The shunt 38 is rotated more than 5 times, and the drop of the load is also accelerated, as shown by the arrow on the right side of the mouth in Figure 10, which will be described later. The distance also increases.

Therefore, compared to the safety brake that can be applied to the first stage/yaft 38, the assembly accuracy and stopping accuracy are both unstable and expensive.

[Purpose of the invention]

The present invention provides an auxiliary brake device that reliably brakes the load by utilizing centrifugal force due to abnormal rotational force generated in the braked shaft when a failure occurs in the main brake or main shaft system and the load is lowered. , a centrifugal element provided on a centrifugal element support body is brought into direct contact with a fixed part to which a constant frictional torque value is applied in advance, thereby providing a reliable braking function and an inexpensive auxiliary brake device for winding. Its purpose is to provide.

[Summary of the invention]

The configuration of the auxiliary brake device for a hoisting machine according to the present invention includes a centrifugal element that is released when centrifugal force of a certain number of revolutions or more is applied to a rotating part fixed to a shaft to be braked, and A fixed part is provided around the outer circumference of the centrifuge, which is fixed while maintaining a constant frictional torque value, and when the centrifugal element is released, it collides with the fixed part to give I11 motion.

Further notes are as follows.

As mentioned above, the auxiliary brake device for a hoisting machine according to the present invention does not need to consider extending its lifespan, and does not need to consider improving performance like a general main brake.

From this perspective, the current configuration can be said to be more than what is needed.

As with the patent No. 54.1699 explained in the conventional example, it is possible to fully satisfy the function by having a track record of developing a method of directly abutting the rotating part and the fixed part. That's what I thought,
We developed this book with the belief that it would be highly feasible to add these to motor shafts with low torque.

[Embodiments of the invention]

An embodiment of the auxiliary brake device for a hoisting machine according to the present invention is as follows:
This will be explained with reference to FIG. 1, FIG. 2, FIG. 2, FIG. 10, and FIGS. 11 to 14.

Here, (a) and (b) of FIG. 11 are a partially opened front view and a side sectional view of an auxiliary brake device for a whistle I according to an embodiment of the present invention, and FIG. 12 is a centrifugal FIG. 13 is an exploded perspective view of the centrifuge support portion, and FIG. 14 is an exploded perspective view of the fixed portion thereof.

In the figure, the same symbols as in Figure 2 indicate the same parts, 10A is a disc spring, IIA is a brake valve, 12A is a brake wheel, 13A is a brake case, 14A is a centrifugal element support, 15A, 15A-1° 15A-2 is a centrifugal element, 18A is a brake cover, 21 is a retaining ring, 22.23 is a support body A
, B, 24 is a pin, 25.25-1.25-2 is a leaf spring, and 26 is a protrusion.

OA is related to the elastic body, the brake wheel 12A is related to the fixed part, the brake case 13A is related to the frame, and the centrifugal element support 14A is fixed to the braked shaft 8. This relates to the rotating part.

That is, a centrifugal element support 14A that supports a centrifugal element 15A is disposed at one end of a braked shaft 8 supported by a bearing 9 provided in a brake case 13A forming a gear box.

And the centrifugal element support 14. A is spline-coupled to the braked shaft 8, and one end thereof is prevented from being removed by a retaining ring 21.

Thus, the centrifuge support 14A is shown in FIG.

As shown in Figure 13, especially the W perspective view of Figure 13,
Support A22. It is composed of a support B23, a pin 24 that connects them at a constant interval, a centrifugal element 15A, and a leaf spring 25.

The centrifugal element 15A is prevented from opening below a certain number of revolutions by a leaf spring 25.

That is, when it does not operate, the centrifugal element 1 shown in FIG.
5 A, -1, and at this time,
The leaf spring 25 is in the state of leaf spring 25-1.

When the rotation speed exceeds a certain number of rotations and a centrifugal force that exceeds the restraint force of the leaf spring 25 is applied, the centrifugal element 15A-2 protrudes, and the leaf spring 25 in this case becomes the leaf spring 25-2.
2.

A brake wheel 12A is disposed on the outer circumference of the centrifugal element support 14A, and the centrifugal element 15A is disposed on the inner circumferential surface of the brake wheel 12A.
A plurality of protrusions 26 are formed that abut and connect when the protrusions protrude.

Still, one side of the brake wheel 1.2A is the 11th
As shown in (b) of the figure, the other side is pressed by the brake cover 18AK, and the other side is in contact with the brake jigs IA, receives a certain pressing force from both sides by the disc spring IOA, and is applied with a certain torque sufficient to hold the load in advance. It has been granted.

Thus, the brake cover 18A is fixed to the brake case 13A with the bolts 20, and the brake cover 18A is fixed to the brake case 13A with the bolts 20.
The IA has two protrusions that are locked to four parts of the brake case 13A so as to be slidable left and right. Further, the outer periphery of the brake wheel 12A is loosely fitted into the brake case 13A, and the centrifugal element 15A and the protrusion 26 of the brake wheel 12A abut against each other, and an outward force is applied in addition to the rotational direction. In this case, frictional force can be exerted not only on both sides of the brake wheel 12A but also on the outer peripheral surface of the brake wheel 12A. It is structured as follows.

In these configurations, if the main brake 1 is unable to brake due to some unexpected situation, or the connecting shaft 4 is broken, the downward force of the load causes the braked shaft 8 to
starts to rotate at high speed.

As a result, the speed of the centrifugal element support 14A is increased at the same time, and the built-in centrifugal element 15A protrudes beyond the restraining force of the plate spring 25, and the brake wheel 1.2A to which the braking force has been applied in advance is It abuts against the protrusion 26 and receives braking force to stop and hold the load.

In order to release these collisions, it is easy to do so by individually rotating in the opposite direction.

As described above, according to the above embodiment of the present invention, the auxiliary brake device is such that the brake wheel 12A utilizes a simple disk as a device related to a constant friction torque value toward the outer circumference of the rotating part. At the same time, the braking force is generated on the outer circumferential surface of the brake wheel 12A, and at the same time, the shortfall in braking force is made up by making the brake wheel 12A as large in diameter as the brake wheel 12A, and using a disc spring IOA with a large amount of deflection. Since the amount of deflection of the OA is very small, the thrust force that does not require adjustment is simply installed and applies braking force to both sides of the brake wheel 12A. It is a small and efficient Bunuki mechanism.

However, since the auxiliary brake device can be installed on the first-stage shaft part mentioned earlier, that is, the braked shaft 8, it is possible to detect the highest rotation speed and utilize a large centrifugal force, which reduces the weight of Ratchets 1-. Variation.

Since variations in spring force can be easily absorbed, a relatively stable operating rotation speed can be obtained without any adjustment at the time of assembly.

In Figure 10 mentioned earlier, A indicates main brake failure,
1 shows the operation of the auxiliary brake device, C shows the case of a conventional auxiliary brake device, and 2 shows the case of the one according to the present invention in which the auxiliary brake device is attached to the first stage shaft portion, that is, the shaft to be braked. .

As described above, compared to conventional products, it is safer and
Generally speaking, the following effects can be obtained without any deterioration of reliable functions.

J. The configuration can be simplified. That is, it is possible to reduce the number of parts by about 40 factors, and maintenance can be facilitated.

2 In relation to the reduction in the number of parts, it has a thicker T than the conventional product.
TL cost reduction can be achieved. That is, when compared with the configuration described in the above embodiment, it is possible to reduce the cost by approximately 55%.

Therefore, although the second embodiment relates to a hoist, the present invention is also applicable to a general-purpose hoist for hoisting a load such as a mold block.

〔Effect of the invention〕

According to the present invention, the centrifugal element provided on the centrifugal element support is brought into direct contact with a fixed part that has a constant friction torque value in advance, thereby providing a reliable braking function and an inexpensive hoisting machine. This invention can provide an auxiliary brake device for use in cars, and can be said to be an excellent invention in practical terms.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a typical hoist, Fig. 2 is a sectional view of a conventional auxiliary brake device, Fig. 3 is an explanatory diagram of their principle, and Figs. 6 is a sectional view of another conventional example, FIG. 7 is a side sectional view thereof, and FIG. 8 is a partially opened sectional view of the rotating body. , FIGS. 9 and 10 are diagrams explaining the principle thereof, and FIGS. 11A and 11B are a partially opened front view and a side sectional view of an auxiliary brake device for a hoist according to an embodiment of the present invention. , FIG. 12 is a front view of the centrifuge support portion with one support removed, FIG. 13 is an exploded perspective view of the centrifuge support portion, and FIG. 14 is a view of the fixed portion of the centrifuge support portion. It is an exploded perspective view. 1... Main brake, 2... Hoisting morph, 3... Rope drum, 4... Connection shaft, 5... Main body frame, 6... Reduction device, 7 ...safety brake, 8.
... Braked shaft, 9... Bearing, 10A... Belleville spring, I
IA... Pregisque, 12 people... Brake wheel, 13A... Brake case, 14 A... Centrifuge support, 15A. ], 5 A, -1-, 15B -1...centrifuge, 1
8A...Pragi force bar, 20...Bolt, 21...
- Retaining ring, 22...Support A, 23...Support B, 2
4...Pin, 25°25-1.25-2-・Plate spring,
2G...Protrusion, 38. 1st stage/yaft. Agent Patent attorney Kosaku Fukuda (and 1 other person) No. 3 Country 17α *, Rizu No. δ Prisoner No. 9 Fast-talking 10 Country No. 11 Snake (a) No. 11 (b) No. 12 乎 73 mouth

Claims (1)

[Scope of Claims] 1. A centrifugal element that is released when a centrifugal force of a certain value or more is applied to a rotating part fixed to a shaft to be braked, and
A fixed part is provided around the outer circumference of the rotating part and is fixed while maintaining a constant friction torque value, and when the centrifugal element is released, it collides with the fixed part and applies braking. Auxiliary brake device for two types. 2. In the item described in claim 1, the constant frictional torque related to the fixed part is applied to two sides in the +111+ direction by the elastic body, and is also applied between the outer peripheral part of the fixed part and the frame body. This is an auxiliary brake device for a hoisting machine, which is configured to act in a number of ways depending on the friction force. 3. In the product described in claim 1, the centrifugal element and the fixed part are connected to the first stage reduction part of the reduction gear (motor 11Q).
b) An auxiliary brake device for a hoisting machine configured to be attached to.