JP2000053399A - Clamping device in heavy weight transferring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamping device which can surely control jacks for opening and closing clamp arms clamping a rail for transferring heavy weight and jacks for clamps. by a hydraulic circuit of one system. SOLUTION: This device is provided with two clamp arms 43 to be opened and closed by jacks for opening and closing 44, jacks for clamp 45 pushing up these two clamp arms 43 when the arms 43 are closed and clamping a rail 13 and a hydraulic circuit part 61 controlling these. This hydraulic circuit part 61 is constituted to operate in a direction that the jacks for opening and closing 44 are closed by clamp pressure oil, to open a hydraulic sequence valve 70 by a rise in pressure when the jacks 44 are closed, to clamp the jacks for clamp 45 by raising the jacks 45, to lower the jacks for clamp 45 by clamp release pressure oil, to open a hydraulic sequence valve 72 by a rise in pressure due to the lowering and to operate in a direction that the jack for opening and closing 44 is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp apparatus for a heavy load transfer apparatus for transferring a heavy load on a rail by a reaction force of a rail clamp apparatus fixed to a rail made of H-section steel or the like. is there.

[0002]

2. Description of the Related Art As shown in FIG. 6, a rail 13 (with or without a reinforcing rib 14) as shown in FIG. A heavy object 10 is placed on a movable cart 11 having wheels 12 on a rail 13, and a rail clamp device 16 is fixed to the rail 13. A horizontal jack is provided between the rail clamp device 16 and the movable cart 11. 15, a piston rod 17 at one end of the horizontal jack 15 connects a bracket 18 of the movable carriage 11 to the horizontal jack 15.
The piston rod 17 at the other end of the rail clamp device 1
6 and the rail clamp device 16
The piston rods 17 on both sides are expanded and contracted and moved in the forward or backward direction by utilizing the reaction force. In order to perform the transfer by such a transfer device, it is necessary to repeat the operation of fixing and detaching the rail clamp device 16 to and from the rail 13 many times.
In the case of the rail 13 having four, since the reinforcing ribs 14 are in the way, the operation of attaching and detaching is troublesome.

Various clamp devices have been proposed for a conventional heavy object transfer device. Representative devices will be described with reference to FIGS. 8 and 9. FIG. In FIG. 8, the support 21 of the gripping cylinder 19 is placed on the rail 13 and
When the piston rod 27 of the operation cylinder 26 connected to the upper end of the support column 24 is extended, the distal end of the piston rod 27 is connected to the bracket 28 of the gripping hook 23 by the shaft 29.
Rotate in the direction. At this time, the operation cylinder 26 is also
Pivots slightly on the fulcrum. When the tip of the grip hook 23 is positioned on the lower surface of the rail 13, the operation cylinder 26 stops the advancement of the piston rod 27, and the ram 20 is extended this time. Then, the gripping cylinder 19 and the gripping hooks 23 on both sides are raised, and the non-slip at the tip end of the gripping hook 23 bites into the lower surface of the rail 13 and the rail clamp device 16 is fixed. When the gripping hook 23 is removed, the ram 20 is contracted to form a gap on the lower surface of the rail 13 at the tip of the gripping hook 23, and the operating cylinder 26 is contracted. Then, the gripping hook 23 pivots outward with the shaft 22 as a fulcrum and spreads further than the reinforcing ribs 14 of the rail 13.
Then, the rail clamp device 16 is moved to a predetermined position and clamped again.

In FIG. 9 showing another conventional example, a head cover 32 is fixed to the upper part of the block body 30 on both sides, a gap is provided on the lower surface for the rail 13 to be fitted, and a piston 31 is provided inside. The upper chuck 33 is mounted on the rail 13 so that the rail clamp device 16 is placed over the rail 13, and the left and right block bodies 30 are fixed. A wedge 39 is inserted into the insertion groove 38 inside the rail 13 from the length direction of the rail 13. When hydraulic pressure is applied to the upper oil chamber 34 from the pressurized oil inlet 36,
Since the upper chuck 33 is in contact with the rail 13, the piston 31 rises together with the wedge 39, and the rail 13 is engaged with the engagement groove 40 of the wedge 39, and is held between the upper chuck 33. Is fixed. When the clamp is released, the block 30 is lowered by applying hydraulic pressure from the pressure oil outlet 37 to the lower oil chamber 35 to form a gap between the rail 13 and the engagement groove 40 of the wedge 39, and the wedge 39 is pulled out. In this state, the rail clamp device 16 is moved to a predetermined position and clamped again.

[0005]

In the case of the rail clamping device 16 shown in FIG. 8, when clamping, the piston rod 27 of the operating cylinder 26 is first extended while the gripping cylinder 19 is lowered, and the rail 13 is gripped by the gripping hooks 23 on both sides.
Then, the ram 20 of the gripping cylinder 19 is extended and the gripping hook 23 is raised to clamp the rail 13. When the clamp is removed, the ram 20 of the gripping cylinder 19 is lowered and then the gripping hook 23 is opened. As described above, the hydraulic operations of the gripping cylinder 19 and the operating cylinder 26 must be independently controlled at a timed timing. Therefore, a large number of hydraulic hoses are required. Since it is necessary to detect and control the hydraulic circuit, there is a problem that the sequence for control becomes complicated. Further, the gripping hook 23 clamps the rail 13 while being supported by the shaft 22, so that the movable portion of the shaft 2
2, a large load is applied, and it is impossible to support a large load due to its structure. In addition, if the support of the shaft 22 by the operating cylinder 26 and the piston rod 27 is lost or insufficient for some reason, the holding state of the rail 13 is changed. There is a problem that it may come off and involve danger.

Since the rail clamp device 16 shown in FIG. 9 has only one hydraulic system, the control of the hydraulic circuit is simple, but the wedge 39 must be removed and inserted every time the clamp is performed. It is necessary to prepare many kinds of wedges 39 due to the difference in the shape of the rail 13. In order to use a wide rail 13 such as an H-beam, a gap between the block bodies 30 on both sides is required. There is a problem in that it must be considerably large, and it is extremely difficult to firmly hold it.

According to the present invention, the opening / closing jack 44 and the clamping jack 45 of the clamp arm 43 for clamping the rail 13 can be reliably controlled by one hydraulic circuit, and the rail 13 can be stably held. It is an object of the present invention to provide a clamp device in a heavy object transfer device that can perform the above.

[0008]

According to the present invention, there are provided two clamp arms 43 provided on both sides of a support base 42 so as to be opened and closed by respective opening and closing jacks 44, and when these two clamp arms 43 are closed. Push up and rail 1
3. A clamp device for a heavy-duty transfer device comprising: a clamping jack 45 for clamping 3; and a hydraulic circuit portion 61 for controlling the opening / closing jack 44 and the clamping jack 45, wherein the hydraulic circuit portion 61 ,
By switching the switching valve 79 to the clamping pressure side 68, the opening / closing jack 44 is operated in the closing direction, and the hydraulic sequence valve 70 is opened by the pressure increase due to the completion of the operation of the opening / closing jack 44, and the hydraulic sequence valve 70 is opened.
The clamp jack 45 is raised and clamped through the switch, and the switching valve 79 is switched to the clamp release pressure side 69 to operate the clamp jack 45 in a downward direction. A clamping device for a heavy object transfer device, characterized in that the hydraulic sequence valve 72 is opened by ascending, and the opening / closing jack 44 is operated in the opening direction via the hydraulic sequence valve 72.

In such a configuration, at the time of clamping, pressure oil is sent to the opening / closing jack 44 to move the piston rod 46 in the retreating direction, and the clamp arm 43 is moved.
Stop at the most retracted position inward. When the pressurized oil is further fed, the hydraulic sequence valve 70 is opened by the rise of the pilot pressure, and the pressurized oil is sent to the clamping jack 45. Then, the piston rod 47 protrudes and comes into contact with the upper plate portion 50 to push up the clamp arm 43, and the downward force of the support base 42 and the upward force of the lower plate portion 51 integral with the clamp arm 43 are used as rails. 13 is fixedly clamped. The heavy object 10 is moved by the reaction of the rail clamp device 16 in this clamped state.

At the time of releasing the clamp, the pressure oil is sent to the clamping jack 45 to move the piston rod 47 in the descending direction, whereby the clamp arm 43 descends to release the clamped state of the rail 13. When the pressurized oil is further fed, the hydraulic sequence valve 72 is opened by the rise of the pilot pressure, and the pressurized oil is sent to the opening / closing jack 44. Then, the piston rod 46 protrudes, and the clamp arm 43 stops at the position where it is pushed outward most.
As described above, since the process always shifts to the next process after the completion of one process, accurate control without errors can be performed without the need for a technique for operating the process.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. In FIG. 1 to FIG. 4, reference numeral 18 denotes a bracket connected to a driving device for transferring a heavy object. A bracket support 48 is fixed to the lower surface of the bracket 18, and a lifting bracket 49 is provided on the upper surface. ing. Several types of the bracket support 48 are prepared according to the width of the rail 13. Two U-shaped supports 42 are fixedly attached to the lower surface of the bracket support 48.

On the upper surface of each support table 42, one
The opening / closing jacks 44 each have a piston rod 46.
In order to push up the entire surface of a clamp arm 43 described later on both sides of the opening / closing jacks 44 in total, a total of four clamping jacks 45 are provided. Are mounted so that the piston rod 47 can move up and down. In addition, a moving wheel 58 is provided on the front and rear surfaces of each support base 42, and a slip prevention wheel 59 is provided on the front and rear lower surfaces. The hydraulic valve receiving base 60 of the hydraulic circuit section 61 is attached.

A clamp arm 43 is attached to each of the piston rods 46 on both sides. The clamp arm 43 is formed integrally with the upper plate 50, the lower plate 51, and the side plate 52 in a U-shape.
A substantially long hole 56 is provided in the approximate center of the longitudinal direction of the piston rod 2, and the distal end of the piston rod 46 faces the long hole 56, and is connected by a stopper 57 so as to be vertically movable. In addition, an opening / closing wheel 53 that rolls on the support table 42 is provided at both front and rear ends of the side plate portions 52, and a slip stopper 55 is provided on the upper surface of the lower plate portion 51.
A rod receiver 54 is provided on the lower surface of the upper plate portion 50 so as to face the piston rod 47, and substantially inside the center of the lower plate portion 51, an escape when the reinforcing rib 14 of the rail 13 is located. Notches 80 are formed.
Further, at the four corners of the support table 42, the open / close wheel 5
A vehicle receiver 81 is provided with a slight gap so as to cover 3.

As shown in FIG. 5, a pump 77 and a tank 78 are connected to the hydraulic circuit 61 through a switching valve 79.
The pilot circuit 75 includes a pilot check valve 75, a pilot check valve 76, a hydraulic sequence valve 70, a check valve 71, a hydraulic sequence valve 72, and a check valve 73. The switching valve 79 has a clamp pressure side 68 and a clamp release pressure side 69, and the pilot check valve 75 and the pilot check valve 76 open with a small pilot pressure, and constitute a safety valve circuit part 74. The hydraulic sequence valve 70 and the hydraulic sequence valve 72 are opened with a sufficiently large pilot pressure. The pilot check valve 75 is connected to the hydraulic sequence valve 70 and the check valve 71 and the opening / closing jack 44.
The return path 67 of the opening / closing jack hydraulic circuit 63 for operating the pilot check valve 76 is connected to the pilot check valve 76.
The hydraulic sequence valve 72 and the check valve 73 are connected, and the return path 65 of the clamp jack hydraulic circuit 62 that operates the clamp jack 45 is connected. A pressing path 64 of the clamping jack 45 is connected to an output side of the hydraulic sequence valve 70, and a pressing path 66 of the opening / closing jack 44 is connected to an output side of the hydraulic sequence valve 72.

The operation of the clamp device in the heavy object transfer device of the present invention having the above-described configuration will be described. In FIG. 1, for convenience of explanation, the right-hand opening / closing jack 44 is
The piston rod 46 extends most, and the clamp arm 43
Shows a state in which the piston rod 46 is most retracted, and the clamp arm 43 is drawn inward.
In the initial state, the right clamp arm 43 in FIG.
In this state, both the left and right clamp arms 43 project outward. The rail clamp device 16 suspended by the lifting bracket 49 is placed on the rail 13 with both the left and right clamp arms 43 protruding outward. At this time, the moving vehicle 58 is placed on the upper surface of the rail 13.
Are mounted, and the slip prevention wheel 59 faces both side surfaces of the rail 13. Also, the opening and closing wheel 5 of the clamp arm 43
3 is mounted on a support 42.

In such a state, the switching valve 7
9 is switched to the clamp pressure side 68, and the pressure oil from the pump 77 driven by the motor 82 is sent to the hydraulic sequence valve 70 and the return path 67 of the opening / closing jack hydraulic circuit 63 through the pilot check valve 75 of the safety valve circuit 74. At the same time, the pilot check valve 76 opens. Return path 67
Is sent to the opening / closing jack 44 to move the left and right piston rods 46 in the retreating direction. As a result, the two clamp arms 43 move on the support table 42 with the opening / closing wheel 53. While rolling, it stops at the most retracted position inward as shown on the left side of FIG. At this time, the oil discharged from the opening / closing jack 44 toward the pressing path 66 is supplied to the check valve 73, the pilot check valve 76, the switching valve 7.
After that, it is returned to the tank 78.

When the movement of the piston rod 46 stops,
The pressure on the return path 67 side rises sufficiently large, and accordingly the hydraulic sequence valve 70 is opened by the pilot pressure, and the pressure oil is sent to the pressing path 64 in the clamp jack hydraulic circuit section 62. Then, the piston rods 47 of the right and left four clamping jacks 45 protrude and abut on the entire surface of the rod receiver 54 of the upper plate portion 50 to exert a force to push up the clamp arm 43. Since the clamp arm 43 is loosely fitted to the piston rod 46 in the up-down direction by the long hole 56, only the clamp arm 43 is pushed up, and the downward force of the support base 42 and the lower plate portion 51 integrated with the clamp arm 43 are formed. The rail 13 is clamped and fixedly clamped by the upward force of the slip stopper 55 in the above. The heavy object 10 is moved by the reaction of the rail clamp device 16 in this clamped state. The clamp arm 43
When the position coincides with the position of the reinforcing rib 14 of the rail 14,
The rail 13 is clamped while the reinforcing rib 14 is loosely fitted in the clearance notch 80.

To release the clamp, the switching valve 79 is switched to the clamp release pressure side 69, and the oil compressed from the pump 77 is sent to the hydraulic sequence valve 72 and the return path 65 via the pilot check valve 76 of the safety valve circuit 74. And the pilot check valve 75 is opened. The pressure oil sent to the return path 65 is sent to the clamp jack hydraulic circuit section 62 to move the piston rod 47 of the clamp jack 45 in a downward direction, and accordingly, the clamp arm 43 is moved by the long hole 56. Piston rod 46
And the rail 13 is loosely fitted in the vertical direction. At this time, the oil discharged from the clamping jack 45 toward the pressing path 64 is returned to the tank 78 via the check valve 71, the pilot check valve 75, and the switching valve 79.

When the piston rod 47 descends and stops, the pressure on the return path 65 side rises sufficiently large. With this, the hydraulic sequence valve 72 is opened by the pilot pressure, and the pressing path 66 in the opening / closing jack hydraulic circuit section 63 is opened. Pressure oil is sent to Then, the piston rods 46 of the left and right opening / closing jacks 44 protrude to push the clamp arm 43 outward, so that the opening / closing wheel 53 rolls on the support table 42 and moves outward as shown on the right side of FIG. Stop at the most pushed position. In this unclamped state, the rail clamp device 16 moves by a predetermined distance and is fixed to the rail 13 in the same manner as described above.

[0020]

According to the first aspect of the present invention, the support table 4 is provided.
2, two clamp arms 43 provided on both sides of each of them so that they can be opened and closed by respective opening and closing jacks 44;
Clamping clamp 45 for pushing up and clamping rail 13 when two clamp arms 43 are closed
And a clamping device in a heavy-duty transfer device including a hydraulic circuit 61 for controlling the opening / closing jack 44 and the clamping jack 45, the hydraulic circuit 61 switches the switching valve 79 to the clamping pressure side 68 by switching the switching valve 79 to the clamping pressure side 68. Then, the opening / closing jack 44 is operated in the closing direction, the hydraulic sequence valve 70 is opened by the pressure increase due to the completion of the operation of the opening / closing jack 44, and the clamping jack 45 is raised and clamped through the hydraulic sequence valve 70. By switching the switching valve 79 to the clamp release pressure side 69, the clamp jack 45 is operated in a descending direction, and the hydraulic sequence valve 72 is opened by the pressure increase due to the completion of the operation of the clamp jack 45. The opening / closing jack 44 is operated in the opening direction via 72. Since it is configured, unlike the conventional two systems, and the clamp can be reliably controlled and-off in one hydraulic system, and it may form a stable clamping action of the rails 13. In addition, since the process always shifts to the next process after the completion of one process, accurate control without errors can be performed without the need for a technique for operating the process.

According to the third aspect of the present invention, the pilot check valve 76 which opens when the pressure on the clamp pressure side 68 increases is inserted into the clamp release pressure side 69, and the clamp release pressure side 69 is inserted.
The pilot check valve 75, which opens when the pressure rises, is inserted into the clamp pressure side 68. Therefore, even if the hose is cut off or the electrical system of the pump or the control circuit is temporarily cut off, the hydraulic circuit The internal pressure can be maintained and the safety is extremely high.

According to the fourth aspect of the present invention, the rail 13
An opening / closing jack 44 that advances and retreats in the horizontal direction and a clamp jack 45 that advances and retreats in the vertical direction are attached to a support table 42 placed on the upper surface, and the upper plate 50 and the lower plate 51 face the side surface of the rail 13. An opening / closing jack 44 is connected to the side plate portion 52. When the clamp arm 43 approaches the rail 13, the upper plate portion 50 faces the clamp jack 45. Since the lower plate portion 51 is made to face the lower surface of the rail 13, the clamp arm 43 does not have a movable portion that may come off the clamping state as in the conventional shaft structure. Large loads can be supported stably.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a clamp device in a heavy object transfer device according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a side view of FIG. 1;

FIG. 4 is an exploded perspective view of FIG.

FIG. 5 is a hydraulic circuit diagram for driving a clamp device in the heavy object transfer device of the present invention.

FIG. 6 is an explanatory diagram of a general heavy object transfer device.

FIG. 7 is a sectional view of a rail 13;

FIG. 8 is a front view showing a first embodiment of a conventional clamping device.

FIG. 9 is a sectional view showing a second embodiment of the conventional clamping device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Heavy object, 11 ... Moving trolley, 12 ... Wheel, 13 ... Rail, 14 ... Reinforcement rib, 15 ... Horizontal jack, 16 ... Rail clamp device, 17 ... Piston rod, 18 ... Bracket, 19 ... Grasp cylinder, 20 ... Ram, 21: support base, 22: shaft, 23: gripping hook, 24: support, 25:
Shaft, 26 ... Operating cylinder, 27 ... Piston rod, 28
... Bracket, 29 ... Shaft, 30 ... Block body, 31 ... Piston, 32 ... Head cover, 33 ... Top chuck, 3
4: Upper oil chamber, 35: Lower oil chamber, 36: Pressure oil inlet, 37
... pressure oil outlet, 38 ... insertion groove, 39 ... wedge, 40 ...
Engagement groove, 41: screw, 42: support base, 43: clamp arm, 44: opening / closing jack, 45: clamping jack, 46: piston rod, 47: piston rod, 4
8 ... bracket support, 49 ... lifting bracket, 5
0: Upper plate portion, 51: Lower plate portion, 52: Side plate portion, 53: Opening / closing wheel, 54: Rod receiver, 55: Slip stop, 56: Long hole, 57: Stopper, 58: Moving wheel, 59: Offset Prevention vehicle, 60 ... Hydraulic valve receiving stand, 61 ... Hydraulic circuit, 62 ... Clamp jack hydraulic circuit, 63 ... Open / close jack hydraulic circuit, 64 ... Pressing path, 65 ... Return path, 66 ... Pressing path, 6
7 ... Return path, 68 ... Clamp pressure side, 69 ... Clamp release pressure side, 70 ... Hydraulic sequence valve, 71 ... Check valve, 7
2 ... Hydraulic sequence valve, 73 ... Check valve, 74 ... Safety valve circuit section, 75 ... Pilot check valve, 76 ... Pilot check valve, 77 ... Pump, 78 ... Tank, 79 ...
Switching valve, 80 ... escape notch, 81 ... car receiver.

Claims (6)

[Claims] 1. Two clamp arms 43 provided on both sides of a support base 42 so as to be openable and closable by respective open / close jacks 44, and when these two clamp arms 43 are closed, they are pushed up to clamp the rail 13. In the clamp device of the heavy-duty transfer device including the clamping jack 45 of FIG. 1 and a hydraulic circuit 61 for controlling the opening / closing jack 44 and the clamping jack 45, the hydraulic circuit 61 includes a switching valve 79. By switching to the clamping pressure side 68, the opening and closing jack 4
4, the hydraulic sequence valve 70 is opened by the pressure increase due to the completion of the operation of the opening / closing jack 44, and the clamping jack 45 is raised and clamped via the hydraulic sequence valve 70 to perform the switching valve. 7
By switching 9 to the clamping release pressure side 69, the clamping jack 45 is operated in the downward direction, and the hydraulic sequence valve 72 is opened by the pressure increase due to the completion of the operation of the clamping jack 45, and the hydraulic sequence valve 72 is opened.
Characterized in that the opening / closing jack 44 is operated in a direction in which the opening / closing jack 44 is opened. 2. An opening / closing jack hydraulic circuit 63 of the opening / closing jack 44 sends a pressure oil when the clamp arm 43 is closed and returns the oil when the clamp arm 43 is opened, and a pressure oil when the clamp arm 43 is opened. And a pressing path 66 for returning oil when closed. The clamping jack hydraulic circuit 62 of the clamping jack 45
A return path 65 that sends pressure oil when descending and returns oil when ascending, and a pressing path 64 that sends pressure oil when raising the clamp arm 43 and returns oil when descending. The clamp device according to claim 1, wherein 3. A pilot check valve 76 which opens when the pressure on the clamp pressure side 68 rises is inserted into the clamp release pressure side 69, and a pilot check valve 75 which opens when the pressure on the clamp release pressure side 69 rises is inserted into the clamp pressure side 68. 3. The clamp device according to claim 1, wherein the clamp device is provided with a clamp. 4. A support table 42 mounted on the rail 13.
An opening / closing jack 44 that advances and retreats in the horizontal direction and a clamp jack 45 that advances and retreats in the vertical direction are attached to the clamp, and the clamp comprises an upper plate 50, a lower plate 51, and a side plate 52 facing the side surface of the rail 13. An arm 43 is provided, and the opening / closing jack 44 is connected to the side plate portion 52. When the clamp arm 43 approaches the rail 13, the upper plate portion 50 faces the clamping jack 45. The lower plate portion 51 is made to face the lower surface of the rail 13. 5. The piston rod 4 of the opening / closing jack 44.
7. The clamp device according to claim 6, wherein the distal end of the clamp 6 is connected to the elongated hole 56 of the side plate 52 so as to be vertically movable. 6. The support table 42 is divided into two parts, left and right, to which an opening / closing jack 44 and a clamping jack 45 are attached, respectively, and the two support tables 42 are connected by a bracket support table 48 integrated with the bracket 18. 6. The clamp device according to claim 4, wherein the width of the bracket support base is changed according to the width of the rail.