JPH0138147Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a hoisting device that raises and lowers an object to be lifted and lowered along a vertical hole excavated underground. It relates to a mechanism for stopping.

(Prior Art) When an object to be lifted or lowered is raised or lowered by a winch along a vertical hole excavated in the ground, the number of revolutions of the winch is generally counted as a means for stopping the object to be lifted or lowered at a predetermined position. A mechanism (first
(Conventional Example) and a mechanism (Second Conventional Example) that stops the winch when a limit switch provided inside the vertical hole is activated due to the descent of the lifted or lowered object.

Also, as a wire rope winding device, Jikoaki
As shown in Publication No. 56-40782 (third conventional example),
A case is rotatably attached to the rotating shaft of the winch so as to cover the drum, and the hoisting rope fed out from the drum is brought into contact with a roller provided rotatably on one side of the case and parallel to the rotating shaft, and the hoisting rope is brought up. When a load is applied to the rope, the hoisting rope is tightened and the case is placed in a vertical position via the rope, and when the hoisting rope is loosened, the case is placed in a tilted position due to the weight of the rope, and the proximal piece attached to the case is Some devices operate a proximity switch to stop the lowering operation.

In addition, as a conventional rope slack detection device, as shown in Japanese Utility Model Publication No. 57-5542 (fourth conventional example),
The end of the hoisting rope is connected to a striker that activates the limit switch, and the striker is installed so that it is pushed up by a spring.When a load is applied to the hoisting rope, the striker lowers and the striker does not activate the limit switch. When the hoisting rope becomes slack due to the landing of a load, the striker is pushed up by a spring, which activates the limit switch.

(Problem to be solved by the invention) However, according to the first conventional example, the stop position is likely to shift due to expansion/contraction or displacement of the hoisting rope;
It also has the disadvantage of being expensive.

According to the second conventional example, since the limit switch must be installed in the vertical hole, the signal line must be drawn along the vertical hole, and there is a risk that the signal line will be cut by the lifting and lowering of the lifted object. . Also, the limit switch may become unusable due to water leakage underground.

According to the third conventional example, a winch lowering stop switch can be provided on the winch side, but the hoisting rope only bends from a straight line into a dogleg shape due to slack in the hoisting rope when the lifted or lowered object lands. Therefore, a sufficient function cannot be exerted in terms of preventing the hoisting rope from loosening, and a problem arises in that the hoisting rope comes off from the drum due to its rigidity.

According to the fourth conventional example, a winch lowering stop switch can be provided at the upper part, but a mechanism for pulling up the hoisting rope by a spring is only provided at the end of the hoisting rope. There is a problem in that the effect of preventing the hoisting rope from loosening when the lifted or descended object lands is not sufficient, and the hoisting rope easily comes off from the drum.

In view of the above points, the present invention eliminates the need to provide a means for detecting the position of the lifted or lowered object in the vertical hole, prevents the hoisting rope from loosening when the lifted or lowered object lands, etc.
It is an object of the present invention to provide an inexpensive hoisting device that can be stopped at an accurate lowering position.

(Means for solving the problem) The hoisting device of the present invention is a hoisting device that raises and lowers an object to be lifted and lowered in a vertical hole using a winch.
With a structure in which both ends of the hoisting rope are connected and wrapped around the drum of the winch, the middle part of the hoisting rope is suspended in a U-shape on the same side of the drum, and the U-shaped hanging part is hung on a sheave attached to the object to be lifted and lowered. , a frame of the winch is pivotally attached to the winch support part so as to be rotatable about the opposite side of the hoisting rope payout side; A spring is provided that biases the winch in a direction that raises the opposite side of the winch, and when the load of the object to be lifted and lowered is acting on the winch, the load overcomes the force of the spring and lifts the winch. The opposite side of the winch is lowered, and the lifted and lowered object is lowered to a predetermined position to reduce the load acting on the winch, so that the winch returns to its original position by the force of the spring, and The present invention is characterized in that a switch is provided that is activated by displacement of the winch, and the lowering operation of the winch is stopped when the switch detects that the winch has returned to its original position.

(Example) The details of the present invention will be explained below with reference to FIG. 1 and FIG. 4, taking as an example a horizontal hole drilling device for gas pipe construction. First, an outline of the horizontal hole drilling device will be explained with reference to FIGS. 3 and 4. In Figures 3 and 4, A is an existing gas pipe buried underground under the road, B is a vertical hole excavated from the ground to the depth of the existing gas pipe A, and 1a and 1b are A casing fitted into the vertical hole B, 2 is a portal-shaped support frame 3
This is an elevating frame consisting of a guide frame 4 and a guide frame 4 attached thereto.

Guide rollers 6 are attached to the upper and lower portions of the left and right columns of the support frame 3 to roll along guide rails 5 that are vertically fixed to opposing positions on the inner walls of the casing rings 1a and 1b. - A stopper 53 is attached to the lower part of the support frame 3, and the stopper 53 is attached to the column parts 3a and 3b of the support frame 3.
A locking piece 54 is attached to the top of the locking member 3. A pair of guide rails 10, 10 are fixed to the guide frame 4, which are arranged almost horizontally toward the screw auger insertion opening 9, which is a cutout of a vertical hole provided in the lower part of the casing 1a. By fitting grooves provided on the outer periphery of guide rollers 11 attached to the four corners of the lower surface of the rotary drive device 7 into these guide rails 10, the rotary drive device 7 is positioned by the guide rails 10. It is starting to be moved.

A traverse hydraulic motor 12 for traversing the rotary drive device 7 is installed on the guide frame 4, and a sprocket 13 rotated by the hydraulic motor 12 and a sprocket attached near both ends of the guide frame 4. 14 and 15 is connected to a connecting part 17 provided on the side of the rotary drive device 7, and the hydraulic motor 12 is operated, so that the rotary drive device 7 is moved laterally along the guide rail 10. I'm starting to do that.

The rotation drive device 7 includes a hydraulic motor 7a for rotating the screw auger and a grip portion 2 of the screw auger 25.
and a rotary chuck device 7b for gripping the chuck 5a,
It also incorporates a mechanism (not shown) for operating the rotary chuck device 7b. A fixed chuck device 24 for vertically adding and disassembling the screw auger is attached to the end of the guide frame 4. The fixed chuck device 24 is arranged in a direction perpendicular to the axial direction of the screw auger 25 so that it can grip and release the pair of left and right hydraulic cylinders 30 and 31 and the grip portion 25a of the screw auger 25. claws 26, 27 movably attached to the
and link mechanisms 21 and 22 that transmit the movement of the piston rods of the hydraulic cylinders 30 and 31 to the claws 26 and 27, respectively.

Next, the winding device of the present invention will be explained with reference to FIGS. 1 to 3. In Figure 3, 33
is a frame as a winch support attached to the casing 1b, and the frame 33 consists of left and right side frames 33a and an upper frame 33b, and the winch 34 of the elevating frame 2 and the operation panel 35 are mounted on the frame 33. be done. The winch 34 mounted on the frame 33 is powered by a hydraulic (or electric) motor 34
The hoisting rope 51 is wound around the drum 34b with both ends connected to the drum 34b. The sheave 5 is made to hang down in a U-shape on the same side, that is, on the side opposite to the pivot joint, and the U-shaped hanging part is attached to the center part of the upper frame 3c of the support frame 3.
2, and by operating the winch 34 in forward and reverse directions, the elevating frame 2 is raised and lowered. 5A is a guide rail provided on the frame 33 so as to be continuous with the guide rail 5.

The reason why the hoisting rope 51 is hung on the sheave 52 is that by suspending the hoisting rope 51 for raising and lowering the horizontal hole drilling equipment by two ropes, the diameter of the rope is small and the rigidity is small, and the drum 3
This is to make the hoisting rope 51 as small as possible and to prevent the hoisting rope 51 from coming off from the drum 34b as much as possible.
The reason for this is to ensure that horizontal force is not generated at the lifting point due to unevenness in the amount of winding and unwinding of the left and right portions of the hoisting rope 51, and smooth lifting and lowering is performed.

The winch 34 is attached to the frame 33 as described below. As shown in FIGS. 1 and 3, the left and right side frames 3 of the frame 33
At the top of 3a and 33a is the upper frame 3 for attaching the winch.
3b, and brackets 36, 36 are fixed to the left and right sides of the upper frame 33b, respectively, and the frame 3 of the winch 34 is attached to the brackets 36 with pins 37.
4c, that is, the portion opposite to the hanging side of the hoisting rope 51, is rotatably pivoted. On the other hand, a plate member 38 is fixed to the front part of the upper frame 33b, and a push spring 39 (a tension spring and a At the same time, an adjustment screw 40 defining the lower limit position of the winch 34 is installed. The spring force of the push spring 39 causes the winch 34 to descend when the load of the lifting frame 2 and each device mounted thereon is applied via the hoisting rope 51, and when the load is removed, the winch 34 pushes up. The size is selected so that it can be used. A limit switch 41 is attached to the plate 38, and its switching arm 41
a is pressed against a rib 34d provided on the frame 34c of the winch 34.

FIG. 2 shows a drive circuit for the winch 34,
42 is an electromagnetically operated switching valve for winch operation inserted between the hydraulic power source 43 and the hydraulic motor 34a, and 44 is one solenoid 42 of the switching valve 42.
This switch is inserted into a circuit 45 that energizes the limit switch 41, and the contact 41b of the limit switch 41 is also inserted into this circuit 45.

In this configuration, when the lifting frame 2 is in the raised position as shown at 2' in FIG. is in the lowered position as shown at 34' in FIG. 1, and the switching arm 41a is also in the lowered position, so the limit switch contact 41b in FIG. 2 is closed. In this state, the rotary chuck device 7
Attach the new screw auger 25 to b, turn on the switch 44, and turn on the solenoid 42.
When the switching valve 42 is placed in the left position by energizing the switch a, the hydraulic motor 34a operates in the downward direction and the elevating frame 2 descends. When the locking piece 54 attached to the support frame 3 comes into contact with the stopper 53 attached to the guide rail 5 of the casing 1a, further descent of the elevating frame 2 is prevented, so the hoisting rope 51 becomes slack and the elevating frame Since the load of 2 and each device mounted thereon is no longer applied to the winch 34, the push spring 39
Due to the force, the opposite side of the winch 34 to the pivot point is pushed upward, resulting in the state shown by the solid line in FIG.
Since the winch 34 is also pushed up by the rib 34d, the limit switch contact 41b shown in FIG.
will stop automatically. When this winding is stopped, both sides of the sheave 52 of the hoisting rope 51 are raised in the hoisting direction by the push spring 39.
Compared to the case where the hoisting rope is bent into a dogleg shape as in the fourth conventional example, the loosening prevention movement acting on the hoisting rope 51 works more effectively.
Compared to the case where only one side is lifted as in the conventional example, the hoisting rope 51 has twice the lifting length,
Increases the anti-sagging effect.

Note that the present invention can also be used in a winding device that does not use the casings 1a, 1b.

(Effects of the invention) According to the invention, whether or not the object to be lifted or lowered has reached a predetermined position is detected by converting changes in the tension of the hoisting rope into vertical displacement of the winch. There is no need to provide a means for detecting the position of the object to be lifted and lowered by a winch in the vertical hole, so the device configuration is simplified, and the problems of signal line disconnections and malfunctions of limit switches and the like are also solved. Further, by using a stopper or the like as shown in the embodiment, it is possible to stop the object to be lifted and lowered at an accurate lowered position. Furthermore, the device of the present invention can be provided at a low cost using relatively inexpensive parts, compared to the case where a rotation speed detector or the like is used or a limit switch or the like is installed in a vertical hole.

In addition, in the present invention, by using a structure in which both ends of the hoisting rope are connected and wound around the drum of the winch, the middle part of the hoisting rope is suspended in a U-shape on the same side of the drum, and the U-shaped hanging part is used for lifting and lowering. Since it is hung on a sheave attached to the body, the diameter of the hoisting rope is small and its rigidity is low, making it less likely to occur if it comes off the drum, and also preventing the tension of the hoisting rope from decreasing when the lifted object lands, etc. The force of the twisting spring raises the opposite side of the winch, which pulls up the two hanging ropes, causing the single straight hoisting rope to bend into a dogleg shape as in the third conventional example. Compared to the case where only the end of the hoisting rope is pulled up as in the fourth conventional example, the effect of preventing the hoisting rope from loosening is greater, and the hoisting rope is prevented from coming off the drum when the object to be lifted and lowered stops descending. be done.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an embodiment of the hoisting device of the present invention, Fig. 2 is a drive circuit diagram of the hoisting hydraulic motor, and Fig. 3 is a horizontal hole excavation device which is an example of an application of the present invention. The front sectional view shown in FIG. 4 is an enlarged EE--E sectional view thereof. 33...Frame, 34...Winch, 34a
... Motor, 34b ... Drum, 34c ... Frame, 39 ... Push spring, 41 ... Limit switch, 51 ... Hoisting rope, 53 ... Locking piece,
54...stoppa.

Claims (1)

[Scope of utility model registration request] In a hoisting device that raises and lowers an object to be lifted and lowered in a vertical hole using a winch, the structure in which both ends of the hoisting rope are connected and wound around the drum of the winch allows the middle part of the hoisting rope to be U-shaped on the same side of the drum.
hanging in a letter shape, the U-shaped hanging part is hung on a sheave attached to the object to be lifted and lowered, and the frame of the winch is pivotally attached to the winch support part so as to be rotatable about the opposite side of the hoisting rope payout side, A spring is provided between the frame of the winch and its support portion, and biases the winch in a direction to raise the side opposite to the pivot joint against the load of the object to be lifted and lowered, so that the load of the object to be lifted and lowered is applied to the winch. If the load is acting on the winch, the load overcomes the force of the spring and lowers the side of the winch opposite to the pivot point, and the object to be lifted and lowered falls to a predetermined position, reducing the load acting on the winch. The winch is configured so that the winch returns to its original position by the force of the spring, and a switch is provided that is activated by the displacement of the winch, and when the switch detects that the winch has returned to its original position, the winch returns to its original position. A hoisting device characterized in that the hoisting device is configured such that the hoisting operation is stopped.