JPH0135564B2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a winch.

[Technical background of the invention]

The winch used when assembling power transmission line towers is
Lifting at a slow speed to align the lifted parts,
It is desirable that it can be suspended. In order to meet such requests, the present applicant has proposed the
We developed the winch disclosed in Publication No. 15394.

As shown in FIG. 1, this winch consists of a prime mover 1, such as an internal combustion engine, which can only rotate in one direction, an intermediate shaft 4 connected to an output shaft 2 of the prime mover via a clutch 3, and this intermediate shaft. 4, a first drive shaft 7 that is connected to the drive shaft 4 through a speed reducer 5, a forward/reverse device 6, a second drive shaft 9 that is driven by the first drive shaft 7 and carries a reel drum 8, and a second drive shaft 9 that is attached to the intermediate shaft 4. A one-way clutch 11 that can freely rotate in one rotational direction of the prime mover with respect to a gear 10 that concentrically surrounds the gear 10, a gear 12 that meshes with the gear 10 at one end, and a worm wheel 13 at the other end. A shaft 14, a hydraulic pump 15 driven by the prime mover 1, a hydraulic motor 18 to which oil discharged from this hydraulic pump is supplied via a flow rate changing means 16 and a direction switching valve 17, and an output shaft of this hydraulic motor. and a worm 19 that is firmly fixed and meshes with the worm wheel 13.

This winch operates as follows. That is, when lifting or suspending at high speed, the forward/reverse device 6 is set to either forward or reverse, and when the clutch 3 is engaged, the reel 8 is rotated at high speed in either the forward or reverse direction. Incidentally, at this time, the flow rate changing means 16 is set to the flow rate 0 position. In addition, lifting at very low speed,
When suspending, the clutch 3 is disconnected and the flow rate changing means 1
Set the flow rate value of 6 as appropriate. As a result, the hydraulic motor rotates forward and backward according to the designation of the direction switching valve 17, and the worm 19 drives the worm wheel 13.
A gear 12 coaxial with the worm wheel drives the intermediate shaft 4 via a one-way clutch 11, and the reel 8 is eventually rotated forward and reverse at a slow speed.

[Problems with background technology]

In the case of the winch configured as described above, the load is directly applied to the prime mover during high-speed operation, so if the load exceeds the range of engine braking, the winch will fall into a free fall state, which is dangerous. In addition, it has the above-mentioned winch hydraulic system and has a complicated configuration.

[Purpose of the invention]

The present invention was developed based on the above circumstances, and is capable of lifting and lowering at high speeds and low speeds, and eliminates the risk of free falling even when the load is large during high speed lifting. The aim is to obtain a winch that is easy to configure.

[Summary of the invention]

The winch of the present invention includes a prime mover, a transmission connected to the output shaft of the prime mover via a clutch, an intermediate shaft driven by the output shaft of the transmission, and an intermediate shaft connected to the intermediate shaft via a clutch. a drive shaft that drives the capstan via an appropriate gear train; a one-way clutch that allows rotation of the drive shaft when the capstan rotates in the forward direction;
It consists of a band brake that brakes the housing of this one-way clutch.

[Embodiments of the invention]

In FIG. 2, an output shaft 22 of an engine 21 is connected to a transmission 24 via a clutch 23.
The transmission 2 is connected to the input shaft 25 of the transmission 2.
The output shaft 26 of No. 4 is connected to an intermediate shaft 29 perpendicular to the output shaft 26 via bevel gears 27 and 28. Both ends of the intermediate shaft 29 are connected to first drive shafts 31, 31 via clutches 30, 30, and the first drive shafts 31, 31 are connected to appropriate gear trains 32, 32, respectively.
the second carrying the capstans 33, 33 through the
It is connected to drive shafts 34, 34.

One-way clutches 35, 35 are attached to the ends of the first drive shafts 31, 31 to allow rotation of the first drive shafts 31, 31 during normal rotation of the capstan. Brake drums 36, 36 are mounted concentrically in the housing of these one-way clutches.
are provided, and these brake drums 35, 3
5 has brake bands 37, 37 facing each other to form a band brake.

The winch of the present invention having the above structure operates as follows. First, in order to perform lifting, the transmission 24 is set to normal rotation, and set to either low speed or high speed. Tighten the band brake firmly. In this state, clutches 23, 30, and 30 are engaged.
As a result, the capstans 33, 33 rotate in the forward direction at low or high speed, and lifting is performed.

During this normal rotation, even if the clutches 30, 30 are disengaged, the one-way clutches 35, 35 prevent the capstans 33, 33 from rotating in reverse.

Next, for hanging, disconnect the clutch 23,
Transmission 24 is set to reverse and set to low or high speed. At this point, loosen the band brake and engage the clutch 23. Then, the capstan 33 starts reverse rotation. Since the rotation at this time is braked by the band brake, even if the load exceeds the range of the engine brake, there will be no free fall condition.

〔Effect of the invention〕

As is clear from the above, the winch of the present invention can perform high-speed and low-speed lifting and hanging, and therefore can be used for assembling steel towers. Furthermore, even if the load is outside the range of engine braking during suspension at high speed, it is safe because a free fall condition does not occur.

[Brief explanation of drawings]

Figure 1 is a plan view showing an example of a conventional winch;
FIG. 2 is a plan view of one embodiment of the present invention. 21... Engine, 23, 30... Clutch, 29
... intermediate shaft, 31 ... first drive shaft, 32 ... gear train, 3
3...Capstan, 34...Second drive shaft, 35...One-way clutch, 36...Brake drum, 37
...brake band.

Claims (1)

[Claims] 1. A prime mover, a transmission whose input shaft is connected to the output shaft of this prime mover via a clutch, an intermediate shaft connected to the output shaft of this transmission, and a transmission connected to this intermediate shaft via a clutch. a first drive shaft, a second drive shaft connected to the first drive shaft via a gear train and supporting a capstan, a one-way clutch that allows rotation of the first drive shaft when the capstan rotates in the forward direction; A winch characterized by having a band brake that applies braking force to a clutch housing.