JPS5849480B2 - Heavy object moving device using center hole jack - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heavy object moving device, and in particular, a tensioning device inserted in the axial direction into a main body and a reciprocating head that enters the main body and moves relatively back and forth. A wedge-shaped collet for biting and fixing the material and a pedestal for receiving the collet are provided, and the collet can be attached to and detached from the pedestal in relation to each collet of the main body and the forward/backward head. By separately arranging the collet attachment/detachment operation means and the collet attachment/detachment operation means on the advancing/retracting head side, the main body and the advancing/retracting head are moved relatively forward and backward, and the tension member is connected to the heavy object on the main body side and the advancing/retracting head side. This relates to a heavy object moving device using a center hole jack that can safely, easily and reliably move a heavy object while alternately engaging and supporting the objects.

In recent years, as construction works have become larger in size, safety and work efficiency have become a problem when moving heavy structures, such as lifting them up and down or transporting them to other locations.

Conventionally, a construction method using a hydraulic jack has been used as one means of moving heavy objects.

In particular, it has a main body and a reciprocating head that moves forward and backward relative to the main body, and is used to bite and fix a tension member inserted in the axial direction into the inside of the main body and the retractable head. A so-called center hole jack is equipped with a collet member and a pedestal for receiving the collet member, and the main body and the advancing/retracting head alternately bite the heavy object, and move the heavy object by moving the two relatively back and forth. developed and made available to the public.

However, in such conventional center hole jacks, the means for attaching and detaching the collet, that is, the work of attaching and detaching the collet to and from the pedestal, and engaging and releasing the tensile material, must be done manually, and the main body and the advancing/retracting head must be operated manually. It was not possible to mechanically attach and detach the collet due to its relative movement with the collet.

Therefore, many operations such as attaching and detaching the collet must be performed manually, resulting in poor workability and problems with work safety.

This inventor came up with this invention in view of such problems.

That is, the purpose of this invention is to move heavy objects safely and
Moreover, it is an object of the present invention to provide a moving device that can be moved simply and reliably.A further object of the present invention is to provide a moving device for heavy objects that has a relatively simple structure and allows for easy adjustment and inspection of collet attaching/detaching means. There is a particular thing.

Thus, the present invention combines a hollow main body 1 and a hollow reciprocating head 2 in a nested manner so that both members can move relative to each other in the axial direction. 4, and a pedestal T that removably receives the collet 5 by an attachment/detachment means, is provided on the main body 1 and the advance/retreat head 2, respectively. A main gripper plate 10, which can be raised and lowered, is provided with the tensile member 4 inserted therethrough and holds a collet 5a loosely fitted through a joint 9, as a step 8a for attaching and detaching, and as a means 8b for attaching and detaching a collet 5b on the advancing/retracting head side. , the head gripper plate 13 into which the tension member 4 is inserted and the collet 5b is loosely fitted via the joint 9 is constantly urged toward the pedestal side by the head spring 14, and the head spring 14 and the main body 1
The head gripper plate 1 is
3 is made movable, and furthermore, it is pivoted to the head gripper plate 13 through a concave notch 16 provided on the circumference of the fixing ring 18 interposed between the belly button gripper plate 13 and the pedestal 7. The present invention is characterized in that an operating rod 20 is provided for locking the locking pawl 17 and releasing the latch 19 that prevents the fixing ring 18, which is always biased in the circumferential direction, from rotating in the same direction. This relates to equipment for moving heavy objects.

The present invention will be described in detail below with reference to the accompanying drawings.

1 to 3 show an embodiment of the present invention.

This invention has a main body 1 and a reciprocating head 2 that moves forward and backward relative to the main body 1.

The main body 1 and the reciprocating head 2 are formed into a substantially cylindrical shape by penetrating a hollow part in the axial direction. It is constructed so that it can move forward and backward relative to the direction.

That is, the main body 1 is a cylinder, and the reciprocating head 2 is formed with a piston portion, so that the main body 1 and the retracting head 2 constitute a cylinder device.

In this way, by introducing and extracting pressure oil from the oil feed pipe 21, the advancing/retracting head 2 moves forward and backward relative to the main body 1.

A tension member 4 connected to a heavy object 3 is inserted into the main body 1 and the reciprocating head 2 in the axial direction.

As the tensile material 4, various wire ropes such as strand ropes and spiral ropes are appropriately selected and used.

Furthermore, a pedestal T is fixed to the main body 1 and the reciprocating head 2, respectively.

In this embodiment, the pedestal 7 is connected to the lower part of the main body 1 and the reciprocating head 2.
It is fixed separately to the top of the.

The pedestal 7 has a plurality of gripper holes 22 through which the tensile material 4 passes, and a concave conical seat 6 for receiving a collet 5 for biting and fixing the tensile material 4 in the gripper hole 22. Each is provided at the top.

The collet 5 has two or more collet pieces of similar size and shape assembled in the circumferential direction to form a substantially conical shape as a whole, and has a hollow shape that passes through the axis from the base on the divergent side to the tip on the tapered side. A gripping part is provided.

The diameter of the gripping portion is smaller than the outer diameter of the tensile member 4.

Of course, the angle of inclination of the outer periphery of the collet 5 is made to be the same as the angle of inclination of the conical seat 6 of the pedestal T.

Note that one set of collets 5 in this embodiment is composed of three collet pieces.

Furthermore, in the main body 1 and the reciprocating head 2, in relation to the collet 5a on the main body side and the collet 5b on the retracting head side, which engage with the pedestal T on the main body side and the pedestal T on the retractable head side, respectively,
Collet attachment/detachment means are provided, including a collet attachment/detachment step 8a on the main body side and a head side collet attachment/detachment means 8b for attaching and detaching the collet 5 to the conical seat 6 of the pedestal 7.

The collet attachment/detachment step 8a on the main body side moves the main body gripper plate 10 in the direction in which the tension member 4 is inserted, that is, in the axial direction of the main body 1, to attach and detach the collet 5a.

The main body gripper plate 10 is provided with a plurality of communication holes 23 through which the bow tension members 4 are inserted, and in the vicinity of the communication holes 23, a number of joint holes corresponding to the number of collet pieces are formed at equal intervals. ing.

A joint 9 such as a bolt is provided with a bulge at one end of the joint hole of the main body gripper plate 10 to prevent the bolt head from coming off.
is inserted from the side opposite to the pedestal to fix the joint 9 and the base of the collet piece that makes up the collet 5, respectively.

Thus, the joint 9, which is integrally fixed to the collet 5, is attached to the main body gripper plate 10 with a loose fit.

Further, the main body gripper plate 10 has a pressing portion 10a projecting from the outside of a disk-shaped center portion in which a plurality of communicating holes 23 are formed.

With this main body gripper plate 10, the tapered side of the collet 5a faces the pedestal 7, and the tensile material 4 is continuously inserted into the gripping part of the collet 5a and the gripper hole 22, and the pressing part 10a is placed on the pedestal 7 side. A small jack 12 is disposed on each side, and a main body spring 11 is disposed on the opposite side of the jack 12.

Thus, the main body gripper plate 10 is always urged toward the pedestal 7 side by the main body spring 11, so that the collet 5a is normally pressed against the conical seat 6 by the main body gripper plate 10.

On the other hand, the collet 5a is opened by pushing up the main body gripper plate 10 with the jack 12 against the urging force of the main body spring 11.

That is, when the main body gripper plate 10 is pushed up, the joint 9 is pulled up by the main body gripper plate 10 after moving a certain distance, and as a result, the collet 5
a is detached from the conical seat 6.

However, the main body spring 11 shown in FIG.
It's not necessarily necessary.

That is, as shown in FIG. 6 to D, when lifting or towing a heavy object 3, a spacer 28 is interposed between the main body 1 and the main body Glisopa plate 10, and the spacer 28 is used to lift or tow the heavy object 3. A structure that can prevent the gripper plate 10 from being lifted upward may be used.

When lifting this heavy object 3, etc., the advancing/retracting head 2
When the tension member 4 is stretched, the collet 5a on the main body side
The collet 5a is automatically detached from the conical seat 6, and on the contrary, when the load is transferred to the main body 1 side, the collet 5a is in contact with the conical seat 6 below due to its own weight. Material 4 can be bitten.

Therefore, in this case, the tension member 4 is
Any structure is sufficient as long as the main body gripper plate 10 is held on the main body 1 regardless of the rise of the tensile member 4 even when the tension member 4 is pulled.

The head side collet attachment/detachment means 8b is carried out by moving the hemlock gripper plate 13 in the axial direction of the main body 1.

Similar to the main body gripper plate 10, the hesodo gripper plate 13 is also provided with a plurality of communication holes 23 through which the tension members 4 are inserted, and a set of collets 5b is provided near the communication holes 23. The number of joint holes corresponding to the number of collet pieces are drilled at equal intervals.

In this joint hole, similarly to the main body gripper plate 10,
Insert the joint 9 with a swelling part such as a bolt head at one end,
The other end of the joint 9 and the base of the collet piece are connected.

Further, the head gripper plate 13 includes a suppressing portion 13a corresponding to the suppressing portion 10a of the main body gripper plate 10.
There are three protruding parts.

This suppressing portion 13a is provided with a hole through which a guide rod 24 for holding the head spring 14 passes.

Furthermore, a locking pawl 17 is pivotally attached to each pressing portion 13a.

In the head gripper plate 13, the tapered side of the collet 5b is directed toward the pedestal T, and the tension member 4 is continuously inserted into the gripping portion of the collet 5b and the gripper hole 22.

Furthermore, the pressing portion 1 is attached to the guide rod 24 erected on the advancing/retracting head 2.
3a, and then the head spring 14 is inserted, and the head spring 14 urges the head gripper plate 13 toward the pedestal T side.

In addition, the pushing rod 1 is placed so that its tip faces the lower part of each pressing portion 13a.
5 is installed upright on the main body 1.

A fixing ring 18 is disposed below the head gripper plate 13 in association with the head gripper plate 13.

The fixing ring 18 has a donut shape as shown in FIGS. 4 and 5, and is attached to the belly button gripper plate 13.
The same number of ratchet-shaped recessed portions 16 are formed on the circumference in relation to the locking pawls 17 provided on the periphery.

This fixing ring 18 is normally urged in one direction in the circumferential direction by a spring 25 whose one end is attached to the reciprocating head 2.

Further, the fixing ring 18 is prevented from rotating in one direction in the circumferential direction by a latch 19.

In this case, the navel gripper plate 13 and the fixing ring 18 are arranged so that each of the locking claws 17 engages with each of the adjacent recessed notches 16.

Further, above the latch 19, the tip of an operating rod 20 whose one end is fixed to the main body 1 side is exposed.

The head-side collet attachment/detachment means 8b configured as described above is
It works as follows.

Figures 4 and 5 show the head side collet attachment/detachment step 8b.
It is an explanatory diagram showing an operating state of.

When releasing the collet 5b, move the advancing/retracting head 2 to the main body 1.
By moving forward to the side, that is, lowering it in FIGS. 4 and 5, and pushing up the pressing part 13a from below relatively with the push rod 15, the heel gripper plate 13 is moved against the biasing force of the head spring 14. raise.

At this time, since the heel gripper plate 13 pulls up the joint blade, the collet 5b is also pulled up and released from the conical seat 6 at the same time.

When inserting the collet 1-5b, it is done by retracting the reciprocating head 2 from the main body 1 side.

First, by supplying pressure oil from one of the oil supply pipes 21 to extend the advancing/retracting head 2, the operating rod 20 is brought into contact with the latch 19, and the locking of the fixing ring 18 by the latch 19 is released (see Fig. 5). ).

As a result, the fixing ring 18 is pulled by the spring 25 and rotates in one direction in the circumferential direction, and at the same time, the recessed notch 16 pivots the locking pawl 17 outward by a cam action.

That is, the locking pawl 17, which prevents the heel gripper plate 13, which is urged toward the pedestal T side by the head spring 14, from pivoting toward the pedestal γ side, is pivoted outward, and the locking pawl 1
7 is released.

Thus, the head spring 14 moves the head gripper plate 13 toward the pedestal T side, and the collet 5b is pressed by the head gripper plate 13 and inserted into the conical seat 6, and the tension member 4 Clamp and hold.

Figure 6 shows the main body 1 side cuff h5a and the advance/retreat head 2 side cuff l-5b when lifting or towing a heavy object 3.
FIG. 2 is an explanatory diagram showing the operating state of the

Figure A shows a state in which the collet 5b on the side of the advancing/retracting head is engaged with the tension member 4, and the advancing/retracting head 2 is extended with respect to the main body 1 to lift a heavy object.

In this case, the collet 5a on the main body 1 side is automatically detached from the conical seat 6 due to the movement of the tension member 4.

Therefore, all the weight of the heavy object is transferred to the collet 5b on the advancing/retracting head side.
is loaded.

FIG. 2B is a diagram when the reciprocating head 2 reaches the rising end.

Figure C shows a state in which the load of the reciprocating head 2 is transferred to the main body 1 side.

Here, the entire weight of the heavy object is held on the pedestal T by the collet 5a on the main body 1 side being automatically inserted into the conical seat 6 due to friction with the tension member 4, and during this time, the advancing/retracting head 2 is moved forward. The relative distance between the main body 1 and the reciprocating head 2 is reduced.

FIG. 3D shows a state in which the load has been transferred to the advance/retract head 2 side again and preparations for lifting a heavy object have been completed again.

The tension material 4 is released from being caught by the collet 5a on the main body 1 side, and the tension material 4 is caught and held only by the collet 5b on the forward/backward head 2 side.

In this way, lifting of a heavy object is performed by repeating the operations shown in A to D above.

In this case, it goes without saying that the main body spring 11 does not necessarily have to be installed.

FIG. 7 is an explanatory diagram showing a state in which a heavy object is suspended.

Figure A shows a state in which the collet 5b on the side of the reciprocating head 2 engages and holds the tension member 4, and the reciprocating head 2 is advanced and suspended.

Figure B shows a state in which the collet 5a on the main body 1 side is inserted into the conical seat 6 while the tension member 4 is supported by the collet 1-5b on the forward/backward head 2 side.

Figure C shows a state in which the collet 5b on the forward/backward head 2 side is removed while the tension member 4 is bitten and held by the collet 5a on the main body 1 side.

Figure D shows a state in which the reciprocating head 2 is extended while the tension member 4 is bitten and held by the levers 5a on the main body 1 side.

Furthermore, in FIG.
This shows the state in which a has been removed.

Thus, by repeating the operations shown in A to E, the heavy object is lifted and lowered.

FIGS. 8 to 11 are explanatory diagrams showing examples of use of the present invention.

FIG. 8 shows an embodiment in which a heavy object 3 is lifted and lowered.

In this case, each device T is installed on the top of two temporary columns 26, and the heavy object 3 is simultaneously suspended by the tension member 4, and both devices T are raised or lowered by the same dimension at the same time to lift the heavy object. Or hang it down.

FIG. 9 shows an embodiment in which a heavy object 3 is pulled out.

While fixing the anchor 27 to the heavy object 3, the temporary pillar 2
6, install this device T horizontally and connect this device T and anchor 2.
This is done by stretching the tensile material 4 between it and 7.

FIG. 10 shows an embodiment in which the heavy object 3 is lowered along a slope.

In this case, the device T1 located above the slope is used as a brake.

This device T2 located below and this device T1 located above pull the heavy object 3 from both sides using tension members 4, and while the device T2 located below pulls and moves the heavy object 3, at the same time, the device T1 located above pulls the heavy object 3 by the same size. The tensile material 4 is sent out.

Note that the inclination angle θ of the slope can be freely set from 0 degrees to 90 degrees.

FIG. 11 shows an embodiment in which a heavy object 3 whose cross-sectional dimensions are not constant is lifted.

That is, this is a case where the left and right main devices T1 are used as virtual loads.

A device T2 installed at the top of the temporary pillar 26 lifts the heavy object 3 at an appropriate position using a tension member 4, and a tension member 4 is placed between the device T1 installed at both left and right ends of the heavy object 3 and the floor surface. The heavy object 3 is stretched, and appropriate loads are applied to each heavy object 3 by devices T1 at both ends, and the heavy object 3 is balanced and lifted.

As described above, according to the present invention, the collet that bites and holds the tensile material can be smoothly replaced, so heavy objects can be moved safely, easily and reliably, and the collet has a relatively simple structure. It is possible to provide a heavy object moving device using a center hole jack that allows easy adjustment and inspection of attachment/detachment means.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway front view, FIG. 2 is a sectional view taken along line 2-2 in FIG. 1, and FIG. 3 is a sectional view taken along line 3-3 in FIG. A line sectional view, FIG. 4 is a diagram showing the open state of the collet on the forward/backward head side, FIG. Figure A is a cross-sectional explanatory diagram, Figure B is a plan explanatory diagram, and Figure 6 is an explanatory diagram for lifting a heavy object. Figure B is a diagram where the advancing/retracting head has reached the ascending end, Figure C is a diagram where the tension material is lifted by the collet on the main body side, Figure D is a diagram where the advancing/retracting head has reached the descending end and has bitten the tension material. Figure 7 is an explanatory diagram when lifting and lowering a heavy object, Figure A is a diagram showing a state in which the tension material is bitten and lowered by the collet on the advancing/retracting head side, and Figure B is a diagram showing the state in which the collet on the advancing/retracting head side is biting and descending. Figure C is a diagram with the collet on the main body side biting the tension material while the collet on the advancing/retracting head side is released, Figure D is a diagram with the advancing/retracting head moved to the ascending end. Figure E is a diagram showing the tension member being bitten by the collet on the advancing/retracting head side, Figures 8 to 11 show examples of how to use the present invention, and Figure 8 is a diagram showing the lifting and lifting of heavy objects. FIG. 9 is an explanatory diagram showing an example of pulling out a heavy object. FIG. 10 is an explanatory diagram showing an example of pulling down a heavy object on an inclined surface. FIG. 11 is a cross-sectional diagram. FIG. 2 is an explanatory diagram showing an example of lifting and lowering a heavy object in a non-uniform manner. In addition, in the figure, 1 is the main body, 2 is the advancing/retracting head, 4 is the bow tension material, and 5
, 5a t 5b is a collet, 7 is a pedestal, 8a is a collet attaching/detaching means on the main body side, 8b is a collet attaching/detaching means on the advancing/retracting head side, 9 is a joint, 10 is a main body gripper plate, 13
is the hesodogritupa plate, 14 is the head spring,
15 is a push rod, 16 is a recessed portion, 17 is a locking pawl, 18 is a fixing ring, 19 is a latch, and 20 is an operating rod.

Claims (1)

[Claims] 1. A hollow main body and a hollow reciprocating head are combined in a nested manner so that both members can move relative to each other in the axial direction, and the tension member inserted into the hollow is bitten. In a center hole jack in which the main body and the advancing/retracting head are each provided with a combination of a collet and a pedestal that removably receives the collet by means of an attaching/detaching means, a. a main body gripper plate which can be raised and lowered, through which the tension member is inserted and which loosely fits the collet through the joint, and (b) as a means for attaching and detaching the collet on the advancing/retracting head side. The head gripper plate is always urged toward the pedestal side by a head spring, and the head gripper plate is made movable by the head spring and a thrust rod provided upright on the main body. A concave arrow part provided on the circumference of the fixing ring interposed between the gripper plate and the pedestal locks the locking pawl pivotally attached to the head gripper plate, and constantly biases it in the circumferential direction. A device for moving a heavy object using a center hole jack, characterized in that an operating rod is provided for releasing a latch that prevents the fixing ring from rotating in the same direction.