JPH08119579A - Braking device for winch drum in cable type carrying machine - Google Patents

Abstract

PURPOSE: To surely applying a brake when a winch drum is stopped by connecting a brake cam on which a ridge part and a bottom part are formed on the side face to a winch drum drive shaft, and providing a rotatable push plate to hold a ball between the push plate and the side face of the brake cam in a pressing manner. CONSTITUTION: A ridge part 88a and a bottom part 88b are alternately formed on the tilted surface on the side face of a push plate 90 of a brake cam 88, and a ball 98 is held between this side face and the push plate 90. When a winch drum is stopped, and the brake cam 88 is reversely rotated under the weight of cargoes, the ball 98 is moved to the brake cam 88, and the push plate 90 presses a brake plate 96 to brake (lock) a winch drum drive shaft 40. As a result, even when a large reversely starting force, etc., is generated in the winch drum drive shaft, the brake is not re-opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake device for a winch drum in a cord-type transporter used for cutting wood or the like.

[0002]

2. Description of the Related Art A winch drum used in a cord-type carrier of this type is required to have a brake structure in which a brake is surely applied to prevent reverse movement when stopped. For this reason, the applicant has adopted a mechanism in which a claw clutch composed of a taper portion and a straight portion is engaged with a winch drum drive system, and the taper portion slips and brakes when a drive torque of a certain level or more is required. A brake device for releasing and driving the winch drum drive shaft is proposed as Japanese Patent Application No. 5-311213.

[0003]

However, in the above-mentioned proposal, there is a relatively large time lag before the brake works. Therefore, during this period, the load drops, and if the inertia is large, when the gears in the mission are reversely moved and the brakes are applied, the rotational force may cause the pawl clutch to operate again and the brakes to be released again. there were. The present invention solves such a problem, and in short, proposes a brake device for a winch drum, which can surely apply a brake when the rotation of the winch drum must be stopped.

[0004]

Under the above problems, according to the present invention, a brake cam having ridges and valleys formed on its side surface is coupled to a winch drum drive shaft, and a ball is formed between the side surface of the brake cam. A rotatable bush plate that sandwiches the brake plate is provided so that it can be pressed against the brake plate, and when the brake cam and push plate are rotated in the forward and reverse directions with a phase difference, the ball is moved to the valley and the pressure of the brake plate by the push plate is loosened. When the winch drum drive shaft is rotated and the winch drum drive shaft reverses, it acts on the brake cam to restore the phase difference with the push plate, pulling the ball to the mountain part and strengthening the pressing of the brake plate by the push plate. (EN) Provided is a brake device for a winch drum in a cord-type transporter characterized by stopping rotation of a drum drive shaft.

[0005]

By taking the above means, that is, since the brake device of the present invention exerts the brake by the wedge action of the brake cam and the ball, no matter how large the reverse starting force is generated on the winch drum drive shaft. However, the situation such as releasing the brake again does not occur.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 7 is an explanatory view showing the usage state of the rope-type carrier, but this rope-type carrier is used for the main rope 10 and the traveling rope between two fixed points (for example, strong trees) in a forest or the like. 12
The main rope 10 is used to suspend the airframe, and the traveling rope 12 is manually moved to move.

[0007] Fig. 5 is a side view of the cable carrier, and Fig. 6 is a plan view. The machine frame 14 is suspended movably over 10. One suspension support drum 16 is fixed to the machine frame frame 14, while the other suspension support drum 16 is fixed to the machine frame frame 14.
An extendable and retractable arm 18 extending horizontally from is attached to the arm 18. As a result, the arm 18 may be shortened when not in use, and the space can be reduced.

Further, the engine frame 20 is mounted on the machine frame 14.
And the traveling drum 24 to which power is transmitted by the mission 22
The traveling rope 12 is wound around the traveling drum 24 two to three times. As a result, the traveling drum 24
When you drive, the aircraft will be able to move. The machine frame 14 is also provided with a winch drum 26, and the wire 28 unwound from the winch drum 26 is guided downward by a guide roller 30 attached to the tip of the arm 18. Since the guide roller 30 is attached to the tip of the arm 18, the winch drum 26 and the guide roller 30 are separated from each other, and irregular winding can be prevented.

FIG. 3 is a schematic diagram of the mission 22,
The transmission 22 is provided with an input shaft 32, a first transmission shaft 34, a second transmission shaft 36, a traveling system transmission shaft 38 and a winch drum drive shaft 40 which are concentric. Of these, a spring clutch type high / low speed change mechanism 42 is provided for the input shaft 32, and a forward / reverse rotation switching mechanism 4 of a slide clutch type is provided for the first transmission shaft 34.
4, the second transmission shaft 36 is provided with a slide clutch type selection mechanism 46 for selecting the traveling system transmission shaft 38 and the winch drum drive shaft 40.

As described above, the power of the engine 20 is transmitted to the input shaft 32 of the mission 22 through the tension arm type clutch mechanism 48, and the high / low speed change mechanism 42 and the forward / reverse rotation switching mechanism 44 change between high and low and forward / reverse. Transmitted from the first transmission shaft 34 to the second transmission shaft 36 at any rotation speed,
It is transmitted to the traveling system transmission shaft 38 or the winch system transmission shaft 40 by the selection mechanism 46. By the way, the traveling system transmission shaft 38
The winch drum drive shaft 40 incorporates brake devices 51 and 50 that release the brake when power is transmitted from the upstream side, and otherwise apply the brake. The details of the brake devices 51 and 50 will be described later.

FIG. 4 shows the transmission 22 to the running drum 24.
FIG. 5 is a schematic diagram showing power transmission to the winch drum 26. Two counter shafts 52 and 54 having the same axis are provided between the transmission 22 and the traveling drum 24 and the winch drum 26, respectively, and the traveling system transmission shaft 38 and the traveling system transmission shaft 38, respectively. Winch drum drive shaft 4
It receives power from 0 by chain transmission mechanisms 56 and 58.

The running drum 24 is attached to a running power shaft 53, and the running power shaft 53 is a counter shaft 52.
Therefore, the chain transmission mechanisms 60 and 62 can rotate at low and high speeds. Then, which rotation speed is selected is selected by operating the clutch mechanism 64 incorporated in the counter shaft 52. The operation of the clutch mechanism 64 is performed by the switching lever 68 which is manually operated.

In addition to this, in this example, the traveling power shaft 53 is also provided with a tension drum 25 which is used when the main rope 10 and the traveling rope 12 are first tensioned. Further, power is transmitted from the counter shaft 54 to the winch drum 26 by a clutch mechanism 66.

Although it has been described above that the clutch mechanism 48, the forward / reverse rotation switching mechanism 44, the selection mechanism 46 and the clutch mechanism 66 are controlled by radio control (details thereof are omitted here), in order to enable this, The operation tools 70, 72, 74, 76 for operating each mechanism are connected to the electric cylinder 7
It is operated by 8, 80, 82 and 84, and an electric signal is sent to it to control it.

Therefore, it seems that the selection of the rotational speed of the traveling drum 24 also needs to be operated by the radio control, but as can be seen from FIG. 7, in the case of A, the inclination is steep,
In the case of B, it is easy to see whether the slope is steep or gentle depending on the place where the carrier is installed. Therefore, it is possible to predict whether the high speed movement is necessary or the low speed movement is sufficient. Therefore, the manual operation by the switching lever 68 is sufficient for this operation.

FIG. 1 is a cross-sectional view of the winch-type brake device 50 described above. One side of the winch drum drive shaft 40 is loosely fitted with a drive gear 86 whose power is intermittently connected to the second transmission shaft 36 by the selection mechanism 46. The brake cam 88 is fixed to the winch drum drive shaft 40 so as to face it.
On the outside of the brake cam 88, a push plate 90 is rotatably attached to the housing 92 so as to face the brake cam 88. Push plate 90 is housing 92
It is slidable inside and can be pressed against a multi-plate brake plate 96 interposed between this and a brake wheel 94 fixedly fitted to the drive gear 86.

FIG. 2 is an explanatory view showing the relationship between the brake cam 88 and the push plate 90.
On the side surface of the No. 8 side of the push plate 90, peaks 88a and valleys 88b are alternately formed as slopes, and a ball 98 is sandwiched between this side surface and the push plate 90. The position of the ball 98 is prevented from shifting by the retainer 100 that is loosely fitted around the brake cam 88. Claws 86a, 88c, 90a are formed on the facing surfaces of the drive gear 86, the brake cam 88, and the push plate 90, respectively, as shown in FIG.

Next, the operation of the brake device 50 of the present invention having the above construction will be described with reference to FIG. In (a), the winch drum 26 is normally rotated and wound up. At this time, the drive gear 86 is normally rotated to rotate the brake cam 88 via the pawls 86a and 88c. When the brake cam 88 rotates, the ball 98 moves from the mountain portion 88a on the side surface of the brake cam 88 to the valley portion 88b, and the push plate 9
The pressure of the brake plate 96 by 0 is loosened to rotate the winch drum drive shaft 40 in the forward direction.

(B) is at the time of stop, but at this time, when the brake cam 88 tries to rotate in the reverse direction due to the weight of the load, the ball 98 will have a valley 88b on the side surface of the brake cam 88.
To the mountain portion 88a, the push plate 90 presses the brake plate 96 to brake (lock) the winch drum drive shaft 40.

(C) shows the case where the winch drum 26 is rotated in the reverse direction, and when the drive gear 86 is reversely rotated at this time, the claw 86a of the drive gear 86 is rotated to the claw 90 of the push plate 90.
It hits a first and is rotated in reverse. Then, the ball 98 moves from the peak 88 a on the side surface of the brake cam 88 to the valley 8
8b, the pressure of the brake plate 96 by the push plate 90 is released to reverse the winch drum drive shaft 40.

At this time, when a reverse rotational force faster than the reverse rotational force from the drive gear 86 is generated on the winch drum drive shaft 40 due to the weight of the load, the state becomes the same as in (b) above and the ball 98 brakes. The trough 88b on the side surface of the cam 88 moves to the crest 88a to apply a brake to the winch drum drive shaft 40. In this way, the winch drum drive shaft 40 eventually reverses only at the speed of the reverse rotational force of the drive gear 86.

On the other hand, the traveling system braking device 51 will be described with reference to FIG. 3. In short, the drive gear 55 loosely fitted to the traveling system transmission shaft 38 and supplied with the driving force from the selection mechanism 46.
The brake disc 59, which is intermittently driven by the clutch structure 57, is slidably fixed to the traveling system transmission shaft 38, and the multi-disc brake structure 61 provided between the brake disc 59 and the case is operated. The brake is effective. In this case, the brake disc 59 is biased to the drive gear 55 side by the spring 63, and in this state, the multi-disc brake structure 61 is in pressure contact (brake is effective).

The clutch structure 57 is adapted to exert a force that slightly separates the brake disc 59 only when the brake disc 59 comes closest to the drive gear 55.
Specifically, it is conceivable that the clutch structure 57 is a pawl clutch, and the roots of the pawl clutches are inclined. As a result, when the drive force to the drive gear 55 is cut off, the brake disc 59 moves toward the drive gear 55 side by the action of the spring 63 to operate the multi-plate brake structure 61, but the drive force is supplied to the drive gear 55 again. Then, the aforementioned separating force acts to release the brake disc 59, and the traveling system transmission shaft 38 becomes drivable.

FIG. 8 is a sectional side view of a main portion of a winch drum 26 showing another embodiment of the present invention.
In short, the slack due to irregular winding of the wire 28 can be detected. Specifically, a sensor arm 104 that can vertically rotate around a horizontal shaft 102 is provided on the wire 28 unwinding side near the winch drum 26, and a roller 106 is horizontally attached to the sensor arm 104. The wire 28 is unwound through the lower side.

On the other hand, the sensing piece 108 is attached to the sensor arm 104.
Is attached, and a certain amount of the sensing piece 108 is detected by the microswitch 110. That is, when the tension of the wire 28 is lost and the roller 106, that is, the sensing piece 108 descends, the micro switch 110 detects this. Incidentally, when the micro switch 110 is activated, appropriate measures such as stopping the driving of the winch drum 26 are taken.

[0026]

As described above, according to the present invention, a ball is sandwiched between a brake cam and a push plate by a wedge action to exert a brake. Therefore, no matter how large a reverse starting force or the like is generated on a winch drum drive shaft. However, the situation such as releasing the brake again does not occur. Further, since the operation is performed for an extremely short time, the amount of descent after giving the stop command is small. Furthermore, since only a few members such as a brake cam, a push plate and a ball are sufficient, various excellent effects such as cost reduction can be expected.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a brake device showing an embodiment of the present invention.

FIG. 2 is an operation explanatory view of the brake device showing the embodiment of the present invention.

FIG. 3 is a schematic diagram of a mission showing an embodiment of the present invention.

FIG. 4 is a schematic diagram of a drive system for a running drum showing an embodiment of the present invention.

FIG. 5 is a side view of a cord-type transporter showing an embodiment of the present invention.

FIG. 6 is a plan view of a cord-type transporter showing an embodiment of the present invention.

FIG. 7 is an explanatory diagram of a usage state of the cord-type transporter showing the embodiment of the present invention.

FIG. 8 is a cross-sectional view of a main part of a winch showing another embodiment of the present invention.

[Explanation of symbols]

 26 winch drum 28 wire 40 winch drum drive shaft 88 brake cam 88a mountain portion formed on the brake cam 88b valley portion formed on the brake cam 90 push plate 96 brake plate 98 ball 104 sensor arm 106 roller 110 micro switch

Claims (2)

[Claims] 1. A brake cam having a mountain portion and a valley portion formed on a side surface thereof is coupled to a winch drum drive shaft, and a rotatable bush plate sandwiching a ball between the brake cam and a side surface of the brake cam can be pressed against the brake plate. When the brake cam and push plate are provided with a phase difference and are rotated in the forward and reverse directions, the ball is moved to the valley and the pressure of the brake plate by the push plate is loosened to rotate the winch drum drive shaft. When reversing, it acts on the brake cam to return the phase difference with the push plate, pulls the ball to the mountain part, strengthens the pressing of the brake plate by the push plate, and stops the rotation of the winch drum drive shaft. Brake device for winch drums in a conveyor. 2. A sensor arm having a roller that abuts on the upper side of a wire unwound from the winch drum is mounted beside the winch drum so as to be movable up and down, and a certain amount of drop of the sensor arm is detected by a microswitch. A brake device for a winch drum in the cable carrier according to claim 1.