JPH1059691A - Wire gripping device and wire jacking device with it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact wire gripping device and a wire jacking device unifying a load with multiple wires and capable of lifting or lowering a large and heavy object. SOLUTION: This wire gripping device is provided with a pressure plate 32 having multiple through holes vertically inserted with wires, an anchor block 33, a release plate 34, an anchor base plate 35, multiple clamping cylinders 36 fixed to the anchor block on the cylinder side and fixed to the release plate 34 on the piston side, wire grips 37 slidably inserted into the through holes of the anchor block 33 and kept in contact with the lower end sections of the through holes of the pressure plate 32 via springs, multiple connecting rods 38 fixed to the lower face of the pressure plate 32 at the upper end sections and fixed to the upper face of the release plate 34 at the lower end sections through the anchor block 33, and spacer blocks 39 fixed to the anchor block 33 at the upper end sections and fixed to the anchor base plate 35 at the lower end sections through the release plate 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a wire gripping device and a wire jacking device using the same.

[0002]

2. Description of the Related Art Conventionally, when a heavy object is lifted at a construction site or the like, a wire or a strand (collectively, a wire) connected to the heavy object is intermittently lifted by a wire jacking device. It has been known.

FIG. 10 is a sectional view showing an example of a wire jacking device (prior art 1). In FIG. 10, a wire jacking device 1 includes a center hole hydraulic jack 2.
And an upper grip (also referred to as a chuck) 3, a lower grip 4, a base plate 5, and the like. A safety grip 4a may be provided between the lower grip 4 and the base plate 5.

[0004] The heavy object 6 is
When the wire 7 suspended at the tip is pulled upward, the piston rod 8 of the center hole hydraulic jack 2 is extended upward by hydraulic pressure, so that the upper grip 3 grips the wire 7 and the piston rod 8 The wire 7 having a substantially axial length L is pulled upward.

At this time, since the lower grip 4 is loosened, the wire 7 can be easily pulled upward. continue,
When the piston rod 8 is retracted downward by hydraulic pressure, the lower grip 4 grips the wire and the upper grip 3
As a result, the piston rod 8 is housed in the cylinder 9 while the position of the wire 7 is maintained.

By repeating the above operation, the wire 7 is pulled upward, and the heavy object 6 is lifted accordingly. FIG. 11 is a sectional view showing another example of the wire jacking device (prior art 2).

In FIG. 11, hydraulic jacks 11a and 11b for supporting the upper grip 10 and hydraulic jacks 13a and 13b for supporting the lower grip 12 are arranged upside down as shown by arrows, and the lengths of the jacks are mutually different. And the space required for the stroke is shared. 14 is a base plate.

Here, opposing operations are performed between the hydraulic jacks 11a and 11b and the hydraulic jacks 13a and 13b through required control such as sequence control or position control, and wires are connected via the upper grip 10 and the lower grip 12. 7 is pulled upward, and the heavy object 6 is lifted.

Japanese Patent Application Laid-Open No. Hei 4-161666 discloses FIG.
1. A hydraulic jacking device as shown in FIG. 12 is disclosed (prior art 3). FIG. 12 is a side view showing an example of the hydraulic jacking device, and FIG. 13 is a partially enlarged view of FIG.

In FIGS. 12 and 13, a hydraulic jacking device comprises a fixed base 15 and an upper beam 16 as a movable base which is reciprocally movable so as to approach and separate from the base 15. A jack 17 provided on the gantry 15 for reciprocatingly driving the upper beam 16, and a jack 7 provided on the gantry 15 and guided to the upper beam 16 through the gantry 15 while passing the wire 7 connected to a heavy object. A lower grip 18 for holding the wire 7 when the upper beam 16 is moved closer to the gantry 15 due to the lower grip 1 provided on the upper beam 16
An upper grip 19 is configured to hold the wire 7 led out of 8 when the jack 17 moves the upper beam 16 away from the gantry 15 side.

Here, the lower grip 18 and the upper grip 19 are respectively composed of base plates 18a, 19a, and a cylindrical case body 18 fixed on the base plates 18a, 19a.
b, 19b; sleeves 18c, 19c housed and fixed in the case bodies 18b, 19b;
19c are provided with edges 18d and 19d for slidably fitted in the wire 19c. Case body 18
A spring 20 is provided above the b and 19b, and the springs 20 constantly urge the edges 18d and 19d downward.

[0012]

In the prior art 1 described above, when a heavy object is small, it can be pulled up by a single wire, but when a heavy object is large, it can be pulled up by a double wire. Required. In that case, installing the wire jacking device 1 for each wire complicates the equipment.
Further, when pulling the multiple wires with the center hole hydraulic jack 2 using a pair of upper and lower grips, there is a limit to gripping of the grip, and there is a limit to heavy loads.

Further, prior art 1 is suitable for lifting a heavy object, but on the other hand, there is a problem that when a heavy object is hung, the wire cannot be released because the wire cannot be released. In Prior Art 2, since the hydraulic jacks 11a and 11b supporting the upper grip 10 and the hydraulic jacks 13a and 13b supporting the lower grip 12 are arranged upside down with respect to each other, they share the space necessary for the mutual length and stroke of the jacks. Although there is an advantage of doing so, as in the case of the prior art 1, when a large heavy object is pulled up with multiple wires,
The installation of the wire jacking device 1 for each wire complicates the equipment. In addition, when a double-stranded wire is pulled by a hydraulic jack using a pair of upper and lower grips, there is a limit to gripping of the grip, and a limit is imposed on a heavy object.

In the prior art 3, a fixed base 15 and an upper beam 16 as a movable base which is reciprocally movable so as to approach and separate from the base 15 are provided. The use of the lower grip 18 pulls multiple wires with a hydraulic jack, and there is an advantage that the multiple wires can be pulled simultaneously with a small number of jacks, but a twisted wire such as a PC strand is used for the wire. In this case, the stranded wire itself has a slight bend, and a heavy object is suspended vertically and pulled upward using the upper grip 19 utilizing the downward load of the heavy object and the lower grip 18. In this case, the load due to the grip tends to be uneven,
It is difficult for each upper grip 19 and the lower grip 18 to completely and uniformly grip each wire.

Therefore, the grip is easily damaged by receiving an excessive load locally, and the wire held by the grip may be broken due to the excessive load. As described above, the prior art 1, the prior art 2, and the prior art 3 have advantages and disadvantages. When a heavy object such as a large one is pulled up by a plurality of wires, the equipment becomes complicated and large.
There is a problem that the load applied to each wire becomes uneven and the wire or the like is damaged, and that the wire can be used only for lifting a heavy object.

The present invention has been made to solve all of the above-mentioned problems, and makes it possible to raise and lower a heavy object such as a large one by making the load uniform by a plurality of wires. An object of the present invention is to provide a compact wire gripping device for equipment and a wire jacking device using the same.

[0017]

According to a first aspect of the present invention, there is provided a pressure plate, an anchor block, a release plate, an anchor base plate provided with a plurality of wire through holes for vertically penetrating wires, and A plurality of clamping cylinders with the cylinder side fixed and the piston side fixed to the release plate, slidably fitted into the wire through holes of the anchor block, and a spring at the lower end of the wire through hole of the pressure plate A wire grip to be contacted, an upper end fixed to the lower surface of the pressure plate, a plurality of connecting rods penetrating the anchor block, and a lower end fixed to the upper surface of the release plate, and an upper end fixed to the anchor block, Penetrate the release plate,
This is a wire gripping device comprising an anchor base plate and a spacer block having a lower end fixed. According to a second aspect of the present invention, the wire gripping device of the first aspect is provided at two locations in the vertical direction of the wire, the anchor base plate of the lower wire gripping device is a fixed base plate, and the anchor of the upper wire gripping device is provided. A hydraulic jack in which the cylinder side is fixed to the fixed base plate and the piston side is fixed to the movable base plate, using the base plate as a movable base plate.

According to the present invention, since the pressure plate and the release plate have a function of integrally moving up and down by a plurality of connecting rods penetrating the anchor block, the pressure plate is driven by driving the clamping cylinder. And the release plate are simultaneously moved up and down so that a plurality of wire grips are forcibly inserted into the through holes of the anchor block so that each wire can be gripped and loosened uniformly.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side sectional view of a wire gripping apparatus of the present invention. In FIG. 1, the wire gripping device 31 includes a pressure plate 32, an anchor block 33, a release plate 34, an anchor base plate 35, a clamping cylinder 36, a wire grip 37, a connecting rod 38, and a spacer block 39. I have.

The pressure plate 32, the anchor block 33, the release plate 34, and the anchor base plate 35 are provided with a plurality of wires 40 (one of which is shown) in the vertical direction. Wire through holes 32a, 33a, 34a, 35a
Is provided.

The clamping cylinder 36 has the cylinder 41 side fixed to the anchor block 33 and the piston 42 side fixed to the release plate 34. A spring 43 is engaged with the piston 42.

The wire grip 37 is connected to the anchor block 3
3 is inserted from above into the tapered wire through hole 33a so as to be slidable in the vertical direction. The spring 44 is engaged with the wire 40 penetrating between the head of the wire grip 37 and the lower end of the wire through hole 32 a of the pressure plate 32, and the spring 44 pushes the wire grip 37 toward the anchor block 33. I am trying to attach it.

The connecting rod 38 has its upper end fixed to the lower surface of the pressure plate 32, penetrates through the through hole 33 b of the anchor block 33, and has its lower end fixed to the upper surface of the release plate 34.

By the connecting rod 38, the pressure plate 32 and the release plate 34 function integrally,
At the same time, vertical movement is possible. The spacer block 39 has an upper end fixed to the anchor block 33, penetrates through the through hole 34 b of the release plate 34, and has a lower end fixed to the anchor base plate 35.

By the spacer block 39, the clamping cylinder 36 extends or retracts the piston 42 to move the release plate 34, which fixes the piston 42 side, up and down correspondingly, and integrally with the release plate 34. The pressure plate 32 is moved up and down.

Reference numeral 45 denotes a hydraulic jack. When the gripping device for a wire is used for a wire jacking device, the anchor base plate 35 is used as a movable base plate and the hydraulic jack 45 is used as an anchor base plate 3.
5 attached to the lower surface.

The pressure plate, the wire grip, the anchor block, the release plate, and the anchor base plate used in the present invention shown in FIG. 1 will be described with reference to FIGS.

FIGS. 2A and 2B are views showing one embodiment of a pressure plate used in the present invention.
(A) is a plan view, and (b) is a sectional view taken along line CC of (a).

2 (a) and 2 (b), the pressure plate 32 has a disk shape, and one wire through hole 32a is provided at the center and six at a position on a concentric circle indicated by a dashed line surrounding the center. In this case, the lower end of the wire through hole 32a of the pressure plate 32 shown in FIG. 1 has a large diameter opening, and a spring 44, which bites the wire 40, is inserted from below to support the upper end of the spring. Can be pressed.

The pressure plate 32 has a through hole 3
Seven wire grips 37 connected to the lower end of 2a via a spring 44 ensure that the seven wires 40 moving through the through hole 32a can be gripped uniformly at all times.

On the lower surface of the pressure plate 32, three connecting rods 3 are positioned concentrically outside the wire through hole 32a.
8 is provided with a hole 33b for attaching and fixing 8 with bolts and nuts.

If a wire guide disc (not shown) is provided above the pressure plate 32 as necessary, a through hole (3 in this case) through which a post used to support the disc by the anchor block 33 passes. 32)
c is provided.

FIGS. 3 and 4 are views showing an embodiment of a wire grip used in the present invention. FIG. 3 is a perspective view of the wire grip, and FIG. 4 (a) shows a closed state of the wire grip. FIG. 4 (b) is a partially cutaway side view showing an open state of the wire grip.

In FIG. 3, a wire grip 37 has a jaw 37a assembled in three parts and a rubber O-ring 46 fitted in a groove 37b provided in the upper circumferential direction of the jaw 37a.
It consists of. The reason why the O-ring 46 is used is to prevent the jaw 37a which is divided into three parts and assembled from being extremely biased during use.

The wire grip 37 has an outwardly wide taper in appearance, so that a gap can be formed between the jaws.
A central portion of the wire grip 37 forms a through hole 37c through which the wire passes. The through hole wall is provided with a screw 37d so that the wire 40 can be easily gripped.

In FIG. 4A, a wire grip 37 is shown.
Is inserted from above into a tapered wire through-hole 33a of the anchor block 33, a spring seat 47 is placed on the head of the wire grip 37, and the spring 44 is bitten by the wire 40. The upper end is inserted into the wide-diameter opening 32b at the lower end of the through hole of the pressure plate 32, and the upper end of the spring 44 is pressed at that position.

As will be described later, the pressure plate 3
When the wire grip 37 is depressed, the wire grip 37 is completely inserted from above into the tapered wire through hole 33a of the anchor block 33 to be in a closed state, and the wire 40 is completely gripped.

In FIG. 4B, a wire grip 37 is shown.
Are inserted into the tapered wire through-hole 33a of the anchor block 33 from above.
4 raises a gap between the wire grip 37 and the wire through-hole 33a.
7 is in an open state, and the grip on the wire 40 is released.

Therefore, the wire 40 moves freely up and down independently of the wire grip 37. FIG. 4 (a),
The operation of opening and closing the wire grip 37 shown in FIG. Since the pressure plate 32 and the release plate 34 are integrated by using the connecting rod 38 as described above, the clamping plate 36 that fixes the piston 42 to the release plate 34 is driven, and the pressure plate 32 is released. The lifting plate 32 and the release plate 34 are moved up and down integrally, and the vertical movement causes the pressure plate 32 and the release plate 34 to exert a forcible function to open and close the wire grip 37.

FIGS. 5A and 5B are views showing an embodiment of the anchor block used in the present invention, wherein FIG. 5A is a plan view, and FIG. 5B is an AA line arrow of FIG. It is sectional drawing by visual observation. In FIG. 5, the anchor block 33 is provided with one through hole at the center corresponding to the wire through hole 32a of the pressure plate 32 used in the present invention shown in FIG. 2, and the other six through holes 35a. Are provided on concentric circles indicated by alternate long and short dash lines. The seven through-holes 33a have an upper wide taper so that the wire grip 37 can be inserted from above.

On the concentric circle outside the through hole 33a, three through holes 33b through which the connecting rod 38 passes are provided.
Further, the plane of the anchor block 33 is provided with a rectangular portion protruding in three directions on the peripheral surface based on the circular portion, so that three clamping cylinders 36 can be easily attached. At the position of the rectangular portion, a hole 33c for inserting a bolt / nut for fixing the spacer block 39 is provided on the lower surface.

A bolt / nut hole 33d for fixing a support block 33f for supporting the clamping cylinder 36 is provided at the rectangular position. FIG.
(A), (b) is a figure which shows one Embodiment of the release plate used for this invention, (a) is a top view, (b) is sectional drawing by the BB line arrow of (a). is there. 6, a release plate 34 is a pressure plate 32 and an anchor block 3 used in the present invention shown in FIGS.
At positions corresponding to the three wire through holes 32a and 33a, 1
Are provided at the center, and the other six through holes 34a are provided on concentric circles indicated by alternate long and short dash lines.

Here, a hole 34c for inserting a bolt for fixing the connecting rod 38 passing through the anchor block 33 and a hole 34d for inserting a bolt for fixing the piston 42 side of the clamping cylinder 36 are provided.

The anchor block 33 has three through holes 34b through which the spacer block 39 whose upper end is fixed is provided. FIG. 7 is a view showing an embodiment of the anchor base plate used in the present invention. In FIG. 7, the anchor base plate 35 is shown in FIGS.
The through holes 32 of the pressure plate 32, the anchor block 33, and the release plate 34 used in the present invention shown in FIG.
One through-hole is provided at the center corresponding to a, 33a, and 34a, and the other six through-holes 35a are provided on concentric circles indicated by alternate long and short dash lines.

The anchor base plate 35 has its upper end fixed to the lower surface of the anchor block 33, and has three holes 35b for fixing the lower end of the spacer block 39 passing through the release plate 34.

The anchor base plate 35 is provided with two wire gripping devices in the vertical direction of the wire.
When used as a wire jacking device, use a fixed base plate for the lower wire gripping device,
Since the upper wire gripping device is used as a movable base plate, a bolt / nut hole 35c is provided for fixing a hydraulic jack mounted between the fixed base plate and the movable base plate.

FIG. 8 is a sectional side view showing an embodiment of the wire jacking device of the present invention. In FIG. 8, two gripping devices are provided at an interval in the vertical direction of the wire.

In this case, the anchor base plate of the lower wire gripping device 31b is used as the fixed base plate 48, and the cylinder 51 side is fixed to the fixed base plate 48.
The movable base plate 49
As the piston 50 with respect to the movable base plate 49.
A hydraulic jack 45 having a fixed side is provided.

The three hydraulic jacks 45 are installed at symmetrical positions and driven synchronously by a hydraulic system. Here, the hydraulic jack 45 is installed outside the wire 40,
The load per unit of the hydraulic jack 45 is reduced, and a gripping device is disposed inside the hydraulic jack 45 to save space in the vertical direction. However, the present invention is not limited to this, and the number and capacity of the hydraulic jacks can be appropriately selected.

As described above, the wire jacking device using the wire gripping devices 31a and 31b of the present invention comprises a pressure plate 32 and a release plate 34.
And a plurality of connecting rods 3 having the anchor block 33 penetrated therethrough.
8, the pressure plate 32 and the release plate 34 are simultaneously moved up and down by the driving of the clamping cylinder 36, and the plurality of wire grips 37 are forcibly moved to the anchor block 33. Into the through-hole 33a to uniformly grip or loosen each wire 40, and
, And the heavy object 52 connected to the tip of the wire 40 is pulled up. 41 is a cylinder, 42 is a piston. In this case, two disks 53a having seven wire through holes,
If the wire guide 53 composed of 53b is used, the wire 40 can be pulled more reliably.

Here, the support 53 c of the wire guide 53 is fixed to the anchor block 33 through the pressure plate 32. Since the present invention has the above-described configuration, it is possible to freely lift and lower heavy objects. Next, a hydraulic circuit system used in the present invention will be described with reference to FIG. FIG. 9 is a diagram showing an embodiment of a hydraulic circuit system used in the present invention. The hydraulic jack 45 is composed of three main jacks 45a, 45b, 45b,
Hydraulic jacks by the hydraulic circuits Ma and Mb and the clamping cylinder
a, 36b, 36c and the lower mini jacks 36d, 36
Hydraulic circuits Na and Nb for operating e and 36f are connected to a common oil tank 54 and one pump 56.

The hydraulic circuits Ma and Mb are connected to a solenoid valve 59b, and the solenoid valve 59b is of a tandem center (PT type) connection type. Here, even when the hydraulic circuit Ma port and the hydraulic circuit Mb port are blocked and the cylinder of the hydraulic jack 45 is fixed when the solenoid valve 59b is in the neutral position, the pump P port and the tank T port are connected. , The oil flows to the tank 54.

Both the hydraulic circuit Ma and the hydraulic circuit Mb
It branches and is connected to jacks 45a, 45b and 45c. Thus, the jacks 45a, 45b, 45c can simultaneously and uniformly operate in the same direction.

On the other hand, the hydraulic circuits Na and Nb are connected to a solenoid valve 59a, and the solenoid valve 59a is of a pump closed center (ABT type) connection type. Here, when the solenoid valve 59a is in the neutral position, only the pump P port is blocked, and the pressure oil does not enter the cylinder.

However, the hydraulic circuit Na port and the hydraulic circuit N
Since port b and oil tank T port are connected,
The oil is released from the hydraulic circuit Na and the hydraulic circuit Nb to the oil tank 54, so that the mini jack is always in a state where the mini jack does not work so that the gripping can be performed.

In the present invention, the lower mini jacks 36a, 3a and 3
6b, 36c and upper mini jacks 36d, 36
e and 36f are connected, and the lower mini jacks 36a, 36b and 36c and the upper mini jacks 36d, 36e and 36f are connected to the hydraulic circuit Nb port.

With this connection, the lower jack 36a,
When the oil flows from side to side in 36b and 36c, the oil flows from side to side in the upper mini jacks 36d, 36e and 36f. Also, the lower jacks 36a, 36b, 36c
However, when the oil flows from side to side, the oil flows from side to side in the upper mini jacks 36d, 36e, and 36f.

In the present invention, by employing the above-described connection method for the hydraulic circuit, the hydraulic jack by the clamping cylinder 36 can be operated without installing a special hydraulic circuit.

The hydraulic circuit M for operating the hydraulic jack 45 and the cooperation of the hydraulic jack by the clamping cylinder 36 are described with reference to hydraulic gauges 57a, 57b, 57c.
Can be input to the hydraulic control device 58 for control.

According to the present invention, the following effects can be obtained. (1) The non-uniformity of the wire load can be reduced by the forced grip. (2) The hydraulic circuit of the grip mechanism is simple and does not require any special hydraulic circuit. (3) The equipment is compact, easy to install, and the construction period can be shortened. (4) It is possible to reliably lift and hang heavy objects, so that it can be guaranteed.

[0061]

According to the wire jacking apparatus using the wire gripping of the present invention, a large-sized or heavy object can be pulled up and down uniformly by a plurality of wires with a compact facility.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a wire gripping device of the present invention.

FIG. 2 is a plan view showing an embodiment of a pressure plate used in the present invention.

FIG. 3 is a view showing one embodiment of a wire grip used in the present invention.

FIG. 4 is a view showing an embodiment of a wire grip used in the present invention.

FIG. 5 is a view showing a pressure plate used in the present invention.

FIG. 6 is a diagram showing an embodiment of an anchor block used in the present invention.

FIG. 7 is a plan view showing one embodiment of a release plate used in the present invention.

FIG. 8 is a sectional side view showing an embodiment of the wire jacking device of the present invention.

FIG. 9 is a diagram showing an embodiment of a hydraulic circuit system used in the present invention.

FIG. 10 is a view showing an embodiment of a conventional jacking device.

FIG. 11 is a view showing another embodiment of a conventional jacking device.

FIG. 12 is a view showing another embodiment of a conventional jacking device.

FIG. 13 is an enlarged view of a grip of the jacking device of FIG. 1;

[Explanation of symbols]

 31 Wire gripping device 32 Pressure plate 33 Anchor block 34 Release plate 35 Anchor base plate 36 Clamping cylinder 37 Wire grip 38 Connecting rod 39 Spacer block 40 Wire 41 Cylinder 42 Piston 43,44 Spring 45 Hydraulic jack 46 O-ring 47 Spring seat 48 Fixed base plate 49 Movable base plate 50 Piston 51 Cylinder 52 Heavy object 53 Wire guide 53a, 53b Disk 53c Strut 54 Oil tank 55 Motor 56 Pump 57a, 57b, 57c Oil pressure gauge 58 Hydraulic control device 59a, 59b Solenoid valve

Claims (1)

[Claims] 1. A pressure plate, an anchor block, a release plate, and an anchor base plate provided with a plurality of wire through holes for vertically penetrating wires, a cylinder side is fixed to the anchor block, and a release plate is fixed to the release plate. A plurality of clamping cylinders having fixed piston sides, a wire grip which is slidably fitted into a wire through hole of the anchor block, and which contacts a lower end of the wire through hole of the pressure plate via a spring, and a lower surface of the pressure plate A plurality of connecting rods having an upper end fixed to the anchor block and penetrating the anchor block and a lower end fixed to the upper surface of the release plate, and an upper end fixed to the anchor block, penetrating the release plate and a lower end to the anchor base plate. Spacer block And a gripping device for wires. 2. The wire gripping device of claim 1 is provided at two positions in the vertical direction of the wire, the anchor base plate of the lower wire gripping device is a fixed base plate, and the anchor base plate of the upper wire gripping device is a movable base plate. A wire jacking device using a wire gripping device, wherein a hydraulic jack having a cylinder fixed to the fixed base plate and a piston fixed to the movable base plate is provided.