JPH0676194B2 - Hoisting machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hoisting machine, and more particularly to an arrangement structure of a hoisting machine braking device such as an electromagnetic brake of an electric chain block.

[Conventional technology]

An electromagnetic brake is generally used as a braking device for a hoisting machine, for example, an electric cheek block.

The structure is generally such that a brake disc is pressed against a brake wheel by a spring to obtain a braking force. Further, when releasing the braking, an electric current is passed through the solenoid to generate an attractive force, and the brake disc is attracted against the spring force to form a gap between the brake disc and the brake wheel. Further, when the motor is energized and driven to wind or lower, the solenoid of the electromagnetic brake is naturally energized and the brake is released. Conversely, when the motor is stopped (fruit juice holding state), the solenoid is not energized, and the brake disc is pressed against the brake wheel by the spring force to generate the brake force.

By the way, there are a direct current solenoid and an alternating current solenoid depending on the current used in the solenoid for performing the brake on / off as described above, but comparing the advantages and disadvantages of both, However, the disadvantages of the DC solenoid are that the response is slow and that a rectification unit (rectification from AC to DC) is required. In all other respects, the DC solenoid is superior to the AC solenoid. In particular, when the AC solenoid is adopted, since the suction force is weak, it is necessary to take some measures if the suction force is amplified by the link mechanism.

On the other hand, since the DC solenoid has a large attractive force, it does not require a link mechanism and can be simplified in structure.

A conventional technique relating to a hoisting machine is disclosed in, for example, JP-A-55-55.
48198 and 62-281742.

[Problems to be Solved by the Invention]

By the way, when considering the downsizing of the hoisting machine, of the above-mentioned conventional technologies, first of all, the AC solenoid type has a small suction force as described above, so it is necessary to install a link mechanism utilizing the action of the lever. Naturally, the structure becomes complicated and large, and it can be said that this method is not suitable for miniaturization.

On the other hand, the DC solenoid system does not require a link mechanism, so the structure is simplified and it is a system suitable for downsizing of the hoisting machine, but in the conventional hoisting machine adopting this DC solenoid system As shown in FIG. 9, the brake wheel 9 is provided on the non-coupling side of the first-stage pinion 8, which is the first stage side of the reduction mechanism (in FIG. 9, the coupling is indicated by reference numeral 11). According to this configuration, the distance from the motor shaft 10 to the brake wheel 9 becomes long, and misalignment easily occurs, which causes a brake lining piece contact.

To further detail the above points, first of all, the hoisting machine of the present invention, for example, an electric chain block is used as shown in FIG. 2, and is suspended from the upper hook 3 on the structure 2 or the like. The electromagnetic brake (not shown) is opened by operating the push button switch 4, and at the same time, the motor 1 is rotated, the speed is reduced by the speed reduction mechanism (not shown), and the chain 5 is wound up or down and hung on the lower hook 6. The heavy object 7 that has been lowered is hoisted or hoisted.

Among the conventional hoisting machines, in the electric chain block of FIG.
And the first stage pinion 8 which is the first stage side of the reduction mechanism are connected by a coupling 11 in order to improve the assemblability, that is, the motor 1 side and the reduction mechanism side are separately manufactured as small unit parts for easy handling, Finally, for the purpose of improving the assemblability of connecting the motor shaft 10 and the first-stage pinion 8 of the reduction mechanism to obtain a large-sized component, the above-mentioned motor shaft
The 10 and the first-stage pinion 8 are connected by a coupling 11, and the non-motor side of the first-stage pinion 8 (in FIG. 9, the motor is indicated by reference numeral 1) is connected to the brake wheel 9.
Is splined, and the first-stage pinion 8 is
Torque is transmitted by meshing with the first-stage gear 12 at substantially the center thereof.

Then, when the solenoid 13 of the electromagnetic brake is energized by the operation of the push button switch 4 (see FIG. 2), a suction force is generated, and the brake disk 29 that has been pressed against the brake wheel 9 by the brake spring 14 until then. It is attracted to the solenoid 13 (the solenoid 13 is pushed by the return spring 16 so that it does not move, and the brake disc 29 is attracted to the solenoid 13), and a gap is created between the brake disc 29 and the brake wheel 9 to release the electromagnetic brake. At the same time, the motor shaft 10 is rotated to wind or lower the heavy load.

Next, when the operation of the push button switch 4 is stopped, the energization of the solenoid 13 is stopped, and the suction force also disappears. Therefore, the brake wheel 9 is pressed against the base 15 via the brake spring 14 and the brake disc 29 to apply the brake, and at the same time, the motor shaft is moved.
Since the rotation of 10 also stops, the operation of hoisting or lowering heavy objects also stops.

Thus, in the above configuration, the brake wheel 9
Is located on the side opposite to the coupling side of the first-stage pinion 8 as described above, the distance from the motor shaft 10 to the brake wheel 9 becomes long, and misalignment easily occurs.
The brake lining is likely to hit one side.

On the other hand, the present inventors, as shown in FIG. 7, have a through hole 24 in the solenoid base 23 having the DC solenoid 13 mounted thereon.
Is provided, and the motor shaft 10 is passed through the solenoid base 23 through the through hole 24, the brake device is
It is arranged between the motor shaft 10 and the first stage pinion 8 which is the first stage side of the reduction mechanism, and a spline is provided in the inner diameter portion of the brake wheel 9 (the spline coupling portion is shown by reference numeral 37 in FIG. 7). Motor shaft through spline
By connecting 10 and the first-stage pinion 8, the conventional DC solenoid hoisting machine shown in FIG. 9, that is, the mounting position of the brake device is limited to the anti-coupling side of the first-stage pinion 8. We have come up with a hoisting machine in which the distance from the motor shaft 10 to the brake wheel 9 is shorter than that of the DC solenoid hoisting machine. According to this, the distance from the motor shaft 10 to the brake wheel 9 is long. It was possible to prevent misalignment and eventually eliminate the uneven contact of the brake lining.

However, according to the configuration of FIG. 7, the one-stage pinion 8 side spline-coupled at the inner diameter portion of the brake wheel 9,
In other words, it supports the suspended load, which is a heavy load even though it is indirect.
A load in the direction opposite to the rotation direction of the motor shaft 10 is applied to the step pinion 8 side, that is, the spline connection part of the brake wheel 9 is in the opposite direction between the connection part of the motor shaft 10 and the connection part of the first step pinion 8. Force is applied to the solenoid 13 to stop the energization of the solenoid 13 and apply the brake, the sliding movement of the brake wheel 9 pressed against the base 15 via the brake spring 14 and the brake disc 29, that is, the motor shaft 10 and The sliding operation of the brake wheel 9 spline-coupled to the first-stage pinion 8 is not carried out lightly and smoothly, and as a result, the responsiveness during braking operation is impaired.

Further, according to the configuration of FIG. 7, when the brake wheel 9 is formed by cutting, as shown in FIG. 8, it is necessary to grind many portions of the cylindrical material (the one-dot chain line portion in FIG. 8). Therefore, not only the cutting process takes time, but also the yield of the material is poor and it is uneconomical. On the other hand, when molding the brake wheel molding material by pressing,
A relatively long motor shaft 1 indicated by the symbol w in FIG.
It is difficult to secure a size corresponding to the stepped pinion support portion.

FIG. 10 shows the above-mentioned chain block adopting the AC solenoid system in the conventional hoisting machine. The chain block shown in FIG. 10 uses the AC solenoid 17 and the brake wheel 9 is directly connected to the motor shaft 10. Is.

Then, in the electric chain block of FIG. 10 which adopts the AC solenoid system, the push button switch 4 (second
When the solenoid (17) is energized and the link (A) 18 is attracted to the movable core 19 of the solenoid 17,
Since the link (B) 20 is pulled against the brake spring 21 and the brake pole 22 is pulled at the same time, the brake disk 29
When the operation of the push-button switch 4 is stopped, the brake is applied in the reverse operation to that described above. However, according to this configuration. As described above, since the link (A) 18 and the link (B) 20 are required, the size of the chain block main body becomes large.

The present invention aims to downsize the hoisting machine main body as compared with a hoisting machine that employs a DC solenoid system, that is, a hoisting machine that employs an AC solenoid system. The present invention relates to a hoisting machine that employs a DC solenoid system that can be easily moved, and its purpose has been a problem with conventional DC solenoid hoisting machines that employ a gear reduction mechanism. An object of the present invention is to provide an improved hoisting machine which does not cause uneven contact of the brake lining, has excellent responsiveness during brake operation, and is easy to manufacture a brake wheel.

[Means for Solving the Problems]

For the above purpose, a through hole 24 is provided in a solenoid pace 23 equipped with a DC solenoid 13 (for reference, refer to those shown in the drawings. The same applies below). Through the through hole 24, the motor shaft 10 is connected to the solenoid base. With it penetrated to 23,
The brake device is arranged between the motor shaft 10 and the first stage pinion 8 which is the first stage side of the reduction mechanism,
This is achieved by providing a spline on the outer circumference of the coupling 11 that connects the 10 and the first-stage pinion 8 of the reduction mechanism, and engaging the outer circumference spline with the inner circumference spline of the brake wheel 9.

[Action]

Thus, according to the present invention having the above configuration, the through hole 24 is provided in the solenoid base 23 in which the DC solenoid 13 is mounted, and the motor shaft 10 is passed through the through hole 24 in the solenoid base 23. The braking device includes a motor shaft 10 and a first stage pinion 8 which is the first stage side of the reduction mechanism.
The conventional DC solenoid hoisting machine shown in FIG. 9, that is, the conventional DC solenoid hoisting machine in which the mounting position of the brake device is limited to the non-coupling side of the first-stage pinion 8 by arranging Compared to the upper machine, the distance from the motor shaft 10 to the brake wheel 9 is shorter, preventing the occurrence of misalignment due to the long distance from the motor shaft 10 to the brake wheel 9, and eventually eliminating the uneven contact of the brake lining. Of course you can
By providing a spline on the outer periphery of the coupling 11 that connects the motor shaft 10 and the first-stage pinion 8 of the reduction mechanism, and engaging the inner peripheral spline of the brake wheel 9 with this outer peripheral spline, the inner diameter of the coupling 11 On the side of the first-stage pinion 8 that is spline-coupled, that is, on the side of the first-stage pinion 8 that supports a heavy load, a load is applied in the direction opposite to the rotation direction of the motor shaft 10, that is, the spline coupling portion of the coupling 11. In the case where a force in the opposite direction is applied between the connecting portion of the motor shaft 10 and the connecting portion of the first-stage pinion 8 to stop the energization of the solenoid 13 and apply the brake, the brake spring 14, the brake disc Sliding of brake wheel 9 pressed against base 15 via 29, ie splined to coupling 11. Combined and have sliding s action of the brake wheel 9 is performed lightly smoothly, it is possible to makes it good responsiveness during braking operation as a result.

Further, according to the present invention having the above-described structure, when the brake wheel 9 is formed by cutting, as shown in FIG. 8, many parts of the cylindrical material (dotted line part in FIG. 8) are formed.
It is not necessary to grind the material, and it is not necessary to spend a lot of time on the cutting work, and the material yield is good and it is economical. On the other hand, when the brake wheel molding material is molded by a press, It is not necessary to secure a dimension corresponding to a relatively long motor shaft / first-stage pinion support portion, which is indicated by a symbol w in the drawing.

〔Example〕

Hereinafter, the case where the hoisting machine of the present invention is applied to an electric chain block will be described as an example with reference to FIGS. 1 and 3 to 6. FIG. 1 shows the entire structure of the electric chain block. FIG. 3 is a partially enlarged view of FIG. 1 showing a brake device which is a main part of the present invention, FIG. 4 is a plan view of FIG. 3, and FIG. 5 is a right side view of FIG. FIG. 6 is a side view of an electric chain block to which the brake device shown in FIGS. 3 to 5 is attached.

As is clear from FIG. 3 to FIG. 5 which shows the brake device, which is an essential part of the present invention, in an enlarged manner, the solenoid 13 is attached to the solenoid base 23 provided with the through hole 24. It is secured by a shaft C ring 27 via a washer 26. A brake disk 29 is slidably attached to the two stud bolts 28 press-fitted and fixed to the solenoid base 23 via the brake wheel 9 between the stud bolts 28 and the base 15.
After interposing the return spring 16 and the return spring 16, a solenoid base 23 having the solenoid 13 is attached. When the solenoid 13 is not attracted, the brake wheel 9, the brake spring 14, the brake disc 2
It is pressed against the base 15 via 9 and a braking force is generated.

A spline is provided on the inner circumference of the brake wheel 9, and the solenoid 13 has two lead wires for energization.
30 is connected.
It is fixed to the case (A) 32 by.

In the above embodiment, reference numeral 33 denotes a passage formed by utilizing the upper corner dead space of the case (A) 32 and the case (B) 34, and the lead wire 30 of the solenoid 13 uses this passage 33. Be wired.

In the above configuration, when the electromagnetic brake solenoid 13 is energized, a suction force is generated, and the brake disc 29 is pulled against the force of the brake spring 14 to attract the gap 35 (solenoid).
Since 13 is pressed by the return spring 16), it does not move, and the brake disc 29 is attracted to the solenoid 13), and the brake is released.

On the other hand, when the energization of the solenoid 13 is stopped, the attraction force of the solenoid 13 disappears, so the brake wheel 9 is pressed against the base 15 via the brake spring 14 and the brake disc 29, and the braking force is generated.

Therefore, in the present invention, the motor shaft 10 and the first stage pinion 8 are connected by the coupling 11. Moreover, a spline is provided on the outer periphery of the coupling 11, and the inner peripheral spline of the brake wheel 9 meshes with the outer peripheral spline (the spline connecting portion is designated by reference numeral 38 in FIGS. 1 and 3). Shown).

As a side effect of the present invention, the electric parts 36 can be collectively installed at the installation location of the brake device of the conventional DC solenoid hoisting machine shown in FIG. 9, and wiring can be facilitated. In addition, since the electric component 36 can be installed separately from the brake device, no malfunction will occur when the electric component 36 is short-circuited or malfunctions due to the influence of the brake lining wear powder.

〔The invention's effect〕

The present invention is as described above, and according to the present invention, the through hole 24 is provided in the solenoid base 23 in which the DC solenoid 13 is mounted, and the motor shaft 10 is penetrated through the solenoid base 23 through the through hole 24. By disposing the brake device between the motor shaft 10 and the first stage pinion 8 which is the first stage side of the reduction mechanism, the conventional DC solenoid type hoisting machine shown in FIG. 9, that is, the mounting position of the brake device. The distance from the motor shaft 10 to the brake wheel 9 is shorter than that of the conventional DC solenoid type hoisting machine, which is limited to the non-coupling side of the first-stage pinion 8.
It is possible to prevent the occurrence of misalignment due to the long distance from the motor shaft 10 to the brake wheel 9 and to eliminate the partial contact of the brake lining, and of course, to connect the motor shaft 10 and the first stage pinion 8 of the reduction mechanism. Provide a spline on the outer circumference of the coupling 11,
By engaging the inner peripheral spline of the brake wheel 9 with this outer peripheral spline, the one-stage pinion 8 side that is spline-coupled at the inner diameter portion of the coupling 11, that is, the one-stage pinion 8 side that supports a suspended load that is a heavy object At, the load is applied in the direction opposite to the rotation direction of the motor shaft 10, that is, in the spline connection part of the coupling 11, a force in the opposite direction is applied between the connection part of the motor shaft 10 and the connection part of the first-stage pinion 8, and the solenoid Even when the power supply to 13 is stopped and the brake is applied, the sliding movement of the brake wheel 9 pressed against the base 15 via the brake spring 14 and the brake disc 29, that is, splined to the coupling 11. The sliding operation of the brake wheel 9 is performed lightly and smoothly. If the answer is good, it can be done.

Further, according to the present invention having the above-described configuration, when the brake wheel 9 is formed by cutting, it is not necessary to cut many parts of the cylindrical material, as shown in FIG. Not only is it unnecessary to take time, but the material yield is good and it is economical. On the other hand, when it is formed by pressing the brake wheel molding material, a relatively long motor shaft It is not necessary to secure the size corresponding to the one-stage pinion support portion.

[Brief description of drawings]

1 to 6 show an embodiment of an electric chain block to which the present invention is applied, FIG. 1 is a vertical sectional front view showing the entire structure thereof, and FIG. 2 is a front view showing a use state of the electric chain block. 3 is a partially enlarged view of FIG. 1 showing a brake device which is an essential part of the present invention, FIG. 4 is a plan view of FIG. 3, FIG. 5 is a right side view of FIG. 4, and FIG. Is a side view of an electric chain block to which the brake device shown in FIGS. 3 to 5 is attached, FIG. 7 is a diagram corresponding to FIG. 3 of the brake device for an electric chain block showing a comparative example with the present invention, and FIG. FIG. 7 is a view showing only the brake wheel indicated by reference numeral 9, FIG. 9 is a partially cutaway vertical front view showing a concrete example of a conventional electric chain block, and FIG. 10 is a conventional type different from FIG. FIG. 3 is a partially cutaway vertical front view showing a specific example of an electric chain block. 8 …… 1st stage pinion, 9 …… Brake wheel, 10 ……
Motor shaft, 11 ... coupling, 13 ... solenoid, 15 ... base, 23 ... solenoid base, 24 ... through hole, 29 ... brake disc, 38 ... spline joint.

Claims (1)

[Claims] 1. A motor (1), a speed reducing mechanism for decelerating the rotation of the motor (1), and a hook (6) for suspending heavy objects, which is attached to the final stage gear side of the speed reducing mechanism. ), And a suction force is generated by passing an electric current, and the motor (1)
And a brake device composed of a DC solenoid (13) for braking the rotation of the brake disc. The brake device has a predetermined gap between the brake disc (29) and the brake wheel (9) with respect to the base (15). Then, when the solenoid (13) is energized, the solenoid (13) draws the brake disc (29) against the force of the brake panel (14) by the gap (35), When the solenoid (13) is de-energized while releasing the brake,
The attraction force of the solenoid (13) disappears and the base (1
Brake spring (14), brake disc (2)
In a hoisting machine having a structure in which a brake wheel (9) is pressed via 9) to generate a braking force, a through hole (24) is provided in a solenoid base (23) attached to the DC solenoid (13), and the through hole (24) is provided. With the motor shaft (10) passing through the solenoid base (23) through the hole (24), the brake device is connected to the motor shaft (10) and the first-stage pinion (8) which is the first stage side of the reduction mechanism. A spline is provided on the outer circumference of the coupling (11) which is arranged between the motor shaft (10) and the first stage pinion (8) of the reduction mechanism, and the inner peripheral spline of the brake wheel (9) is provided on the outer peripheral spline. A hoisting machine characterized by meshing together.