JPS624188A - Safety confirming device for hanger - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a safety confirmation device for a lifting device for lifting or suspending a plurality of long hollow tubes during crane work using a working machine.

Prior Art As shown in FIGS. 13, 14, and 15, the prior art hanging device has a plurality of sets of hook devices at the ends of the left and right images of the inner beam, which are inserted into both sides of the interior of the main beam. It is attached in a fixed manner. To this end, when the hydraulic cylinder inside the main beam was operated to extend and retract, the inner beam and the multiple sets of hook devices were integrated and simultaneously extended and retracted. Therefore, if the lengths of the hollow tubes to be lifted are different, it will not be possible to lift the tube, and if two tubes are to be lifted as shown in Figure 15, the central hook must be folded inward. Therefore, even if limit switches were installed on all the hooks and the electric circuits were connected in series, it would not be possible to energize the circuits. Therefore, since it is not possible to assemble a solenoid valve for the hydraulic circuit, there is no hydraulic circuit that automatically controls the tightening operation of the hooks on both ends of multiple hollow tubes, and the operator must visually confirm safety while operating the crane. was.

Problems to be Solved by this Invention As mentioned above, when working with a conventional hanging tool for multiple hollow tubes, there are some hooks that are not used when hanging multiple tubes and when hanging an odd number of tubes. In addition, if the lengths of multiple hollow tubes are different, the hooks will not be tightened completely and the lifting operation will not be possible. The object of the present invention is to provide a safety confirmation device that automatically stops the hook tightening operation on both end faces of the hollow tube using electromagnetic operation.

Means for Solving the Problems The means of the present invention taken to solve the above-mentioned problems are (1) left and right inner rods fitted inside the main beam of the lifting device so as to be able to extend and slide by hydraulic cylinders. An auxiliary beam and a hook device were attached parallel to the inner beam to a support girder fixed to the tip of the inner beam on one side of the beam.

Then, by the expansion and contraction of the hydraulic cylinder inside the auxiliary beam,
In addition to allowing the hook device to move parallel to the inner beam, all hooks can be folded inward, and limit switches are installed on all hooks to allow the hooks to be folded inward. If it bends,
The structure is such that the contact point of the limit switch is pushed in by the protruding end provided on the limit lever and the electric circuit is closed.C. All the limit switches, DC power supply and solenoid for electromagnetic control are connected in series, and when energized, the hydraulic pressure for the main lifting tool is By being able to control the solenoid valves in the circuit, 2. At the same time each hook tightens all both end faces of multiple hollow tubes with different pipe lengths, all hydraulic cylinders in the main beam and auxiliary beams stop operating. The hydraulic circuit was configured to do so.

Function: Since the hook device attached to each auxiliary beam can move independently, the hanging device of the present invention can reliably tighten both ends of a plurality of hollow tubes with different lengths.
Even if there are several sets of hook devices that are not used, the hooks are folded inward to close the contacts of the limit switch. Therefore, in any case, the electric circuit is energized by tightening the hook, and the hydraulic cylinder for hook tightening can be automatically stopped by operating the electromagnetic control solenoid and the electromagnetic valve.

EXAMPLE Hereinafter, a detailed explanation will be given based on an example of the present hanging tool. As shown in Figure 1, 1 is a frame, 2 is a main beam,
3.3” is an inner beam, but a hydraulic cylinder 4.4
Main beam 2 respectively by operating °
It expands and contracts inside.

In Fig. 2, support girders 5.5" are fixed to both left and right ends of the inner beam 3.3'. On the support girder 5, a plurality of brackets with hooks 6.6° are attached to the support girder 5. Also, multiple sets of auxiliary beam brackets) are attached to the support girder 5° so that they can be moved along the outer circumference of the support girder 5°. .In addition, the bracket with auxiliary beam 7.7″ has
In each case, an auxiliary beam 8,81 is fastened parallel to the inner beam 3'. As shown in FIG. 3, a hydraulic cylinder 9 is installed inside each of the auxiliary beams 8.8°, and a boss block 10 is installed at the tip of the piston rod of the hydraulic cylinder 9. 8°
move inside each. Then, for 5 examples of support girders,
A hook device 11 is installed at the bottom of the tip of the inner beam 3, and a hook device 12.1 is installed at the bottom of the hook bracket 6.6.
3 are installed respectively. On the other hand, a hook device 11' is attached to the lower end of the inner beam 3° of the support girder 5'', and hook devices 12'' and 13'' are attached to the boss block 10 within 8.8° of the auxiliary beam. next,
Each hook device ll, 12.13.11', 12", 13
The details of the angle will be explained with reference to FIG. 15
1 is a mounting portion to which each hook device is attached, and 16 is a bracket which pivotally supports a hook 17 with a pin 14 so that the hook 17 can rotate inward. Further, pin holes 18 and 19 are provided at positions R from the center of the pin 14, and a pin 20 is provided in the pin hole 18.
By inserting the hook 17, the hook 17 can be fixed. Furthermore, the bracket 16 has a protrusion 21 protruding inward for folding and rotating the hook 17. Regarding the hook 17, a bottle hole 22 is formed at a position R from the center of the pin 14. However, when folding the hook 17 inward, the pin 20 is removed, the hook 17 is rotated, and the pin 20 is inserted into the pin hole at the position where the pin hole 22 and the pin hole 19 are aligned. The hook 17 is folded and fixed by inserting it into the hole. In addition, a limit lever 24 with a protrusion 23 protruding is attached to the hook 17 with a pin 25, but the end face 26 of the limit lever 24 is pulled by a spring 28 so as not to push the switch of the limit switch 27. ing. Here, 29 is a hollow tube to be lifted, and the surface of the limit lever 24 with which the end surface comes into contact is a contact surface 30. Note that when the hook 17 is folded and rotated, the protrusion 23 of the limit lever 24 hits the protrusion 21 of the bracket 16, thereby closing the limit switch 27.

Next, the electric circuit of this hanging tool will be explained.

In the electric circuit shown in Fig. 9, 31 is DC ta, 32.3
3, 34, 35, 36, and 37 correspond to limit switches 27 attached to the hooks of each hook device, and are connected in series with the electromagnetic control solenoid 38. The function of the electromagnetic control solenoid 38 is that all limit switches 32, 33, 34, 35, 36
．． When the switch 37 is pushed in to close the circuit and turn on electricity, it operates the solenoid valve in the hydraulic circuit, stops the oil supply to the hydraulic cylinders for tightening both ends of the hollow tube of this hanging tool, and Stop the reduction operation. Furthermore, the electric circuit shown in FIG. 10 is in a state in which hooks that are not used are folded inward in advance depending on the work of lifting the hollow tube.

For example, the hooks to which the limit switches 32 and 33 are attached are folded down to close the switches. A lamp 39 or a buzzer is connected in this electric circuit, and generates a signal such as lighting when all the limit switches are closed.

Next, preparations before actually hoisting a plurality of hollow tubes using this lifting tool will be explained. Align the positions of the ends of multiple hollow tubes on one side in advance, and hoist the lifting tool itself from the ground or floor using a crane for the working machine.
The number of hollow tubes can be either an odd number or an even number, but in the case of an even number, the hooks attached to the tips of the inner beams 3 and 3 are bent inward, and the hook device The spacing is determined to match the spacing between the centers of the hollow tubes that are arranged horizontally and in parallel. Then, move the main hanging tool onto the horizontally placed hollow tube, and set the support girder 5 side to the side where the end faces of the plurality of hollow tubes are aligned, so that the direction of the main beam 2 and the longitudinal direction of the hollow tubes are aligned. Match. and,
The central hook device hangs the longest hollow tube among the plurality of hollow tubes, and the hydraulic cylinder 4.4゛ is operated to expand and contract so that the distance between the hooks is slightly larger than the maximum length of the hollow tubes. . Then, lower the hanging tool until all the hooks are hooked into the holes at both ends of the hollow tube.

Next, details of the hydraulic circuit and hydraulic functions of this lifting tool will be described. In the hydraulic circuit diagram of FIG. 11, 40 is a hydraulic pump, 41 is a relief valve, and 42 is a 3-position solenoid valve.

Here, a lifting device operation panel 4 as shown in FIG.
When the lever 44 of No. 3 is put in the hook tightening direction, the 3-position solenoid valve 42 switches to the left position, and the oil discharged from the hydraulic pump 40 flows through the oil path 45, the 3-position solenoid valve 42, and the oil path 46.
．． 47, the flow is divided into two directions by a flow divider valve 48, and one is an oil path 49, a check valve 50 with biloft, and an oil path 51.5.
2, the oil is sent to the piston loft side of the hydraulic cylinder 4 on the left inside the main beam. The other side is the oil path 49°,
The oil is sent to the piston loft side of the hydraulic cylinder 4' on the right side of the main beam through the check valve 50'' with pilot and the oil passages 51'' and 52''.Then, the left and right inner beams 3.3° are moved inward, respectively. Therefore, each hook device also moves in the direction of tightening both end faces of the hollow tube.At the same time, the return oil from the head side of the hydraulic cylinder 4.4° passes through the oil passage 53. 54, check valve material sequence valve 55, oil line 56.57.3 position solenoid valve 42
It returns to the oil tank 59 via the oil passage 58 at the left position A. Therefore, when the two opposing hooks attached to both ends of the inner beam 3.3" come into contact with both end surfaces of one of the hollow tubes and tighten, the piston loft side of the hydraulic cylinder 4.4" The oil pressure in the communicating oil passages 47, 46, and 60 increases. For this purpose, the check valve material sequence valve 61 opens, and the pressure oil flows through the oil passage 60, the check valve material sequence valve 61,
The oil is sent to the piston loft side of each hydraulic cylinder 9 within 8.8 degrees of the auxiliary beam through the oil passage 62, the check valve 63 with biloft, and the oil passage 64. Therefore, the auxiliary beam 8.
Each hook attached to 8' tightens both end surfaces of a plurality of hollow tubes having different lengths.

Then, in the electric circuit shown in Figure 9, all the rim switches attached to each hook are closed and energized. Therefore, the electromagnetic control solenoid 38 returns the magnetic valve 42 to the neutral position in the 3-position hydraulic circuit in FIG. Pass through the time return flow path, oil path 5
8 and returns to the oil tank 59, so each hydraulic cylinder 4.
The tightening operations of 4' and 9 are stopped.

Now, let's talk about the case of hanging.

Landing or landing on a hollow tube lifted by a working machine. Then, when the lever 44 of the lifting device operation panel 43 is switched to the hook tightening amount, the 3rd position t! The ff valve 42 is switched to the right position. The pressure oil discharged from the hydraulic pump 40 is delivered to the right port of the solenoid valve 42 located at the oil path 45.3, and the oil path 57.
56, the check valve material tends to flow toward the sequence valve 55. However, before the pressure oil opens the check valve material sequence valve 55, the pressure oil is sent to the head side of the auxiliary beam hydraulic cylinder 9 through the oil passage 65. The hydraulic cylinders 9 then each extend outwards and the hook devices in each auxiliary beam also move outwards. Therefore, the hydraulic cylinder 9
When the oil passage 65.57.5 is fully extended outward and stops, the oil passage 65.57.5
6 increases and opens the check valve material sequence valve 55. Therefore, the pressure oil is check valve material sequence valve 55
, through oil passages 54, 53 and 53゛, main beam 2
Oil is sent to the head side of the left and right hydraulic cylinders at 4.4 degrees.

Therefore, since the hydraulic cylinders 4, 4' each extend outward to the left and right, the hook devices of the inner beams 3, 3' also move outward. Here, the return flow path accompanying the extension operation of the hydraulic cylinder 9.4.4' will be described. First, the return oil from the piston loft side of the hydraulic cylinder 9 flows through the oil passage 64, the check valve with biloft 63, the oil passage 62, the check valve material sequence valve 61, and the oil passage 60.4.
6. Returns to the oil tank 59 through the right-hand port of the 3-position solenoid valve 42 and the oil path 58 . Then, the return oil from the piston loft side of the hydraulic cylinder 4.4° is transferred to the left hydraulic cylinder 4.
From the oil passage 52.51 pilot valve 50,
It reaches one boat of the diversion valve 48 via an oil path 49. Also, from the right hydraulic cylinder 4°, there are oil passages 52" and 51".
, check valve 50'' with biloft, and oil path 49'' to reach the other boat of the diverter valve 48. In that case, the hydraulic cylinders 4.4'' must extend at the same speed, so the diverter valve It is necessary to flow an equal amount of the oil that has returned to the two ports of 48. Then, the oil that has returned to the diversion valve 48 from the two sides joins in the diversion valve 48, and flows through the oil path 47.4.
6. Pass through the right-hand port of the 3-position solenoid valve 42, the oil passage 58, and return to the oil tank 59. Note that there is a flow path leading from the piston loft side of the hydraulic cylinder 4 to the oil tank 59 via an oil passage 52.66, a relief valve 67, and an oil passage 68.69 on the left side of the flow divider valve 48, and a flow path that leads to the oil tank 59 on the right side of the flow divider valve 48. From the piston loft side of the hydraulic cylinder 4゛, oil passages 52゛, 66゛, relief valve 67
There is a flow path leading to the oil tank 59 via oil paths 68 and 69. In this circuit, first, when the hydraulic cylinder 4.4'' contracts and tightens both ends of the hollow tube, the center of the hanging tool is not located at the center of the hollow tube in the longitudinal direction, so either the left or right hook is attached to the tube first. Because it tries to contact the edge and tighten it,
The hydraulic cylinder on that side stops the contraction operation at the end.

Then, the hydraulic pressure on the piston rod side of the hydraulic cylinder that has stopped operating becomes high and oil stops flowing, so the function of the flow dividing valve 48 stops and oil is no longer sent to the piston rod side of the opposite hydraulic cylinder. If that happens,
Since both ends of the hollow tube cannot be tightened, a relief valve 67.87'' is provided here, so that even if either of the hydraulic cylinders 4 or 4' stops tightening, the piston rond of the opposite hydraulic cylinder will not be able to be tightened. For example, if the hook on the left side contacts one end surface of the hollow pipe and stops the contraction operation of the hydraulic cylinder 4, the oil passages 52, 51.
The oil pressure at 66 increases and the relief valve 67 is opened. Therefore, the pressure oil that has reached the oil passage 51 from the diversion valve 48, the oil passage 49, and the check valve with pilot 50 is returned to the oil tank 59 via the oil passage 66, the relief valve 67, and the oil passages 68 and 69. In other words, even if the hydraulic cylinder on one side stops operating at the end, the oil supply to the piston rod side of the hydraulic cylinder on the opposite side continues, and the hydraulic cylinder on the opposite side continues to operate until the hook completes tightening both ends of the hollow pipe. Performs a reduction operation and stops the operation at the same time as tightening is completed. Next, the function of the relief valve 67.67' when releasing the hook tightening will be described. When releasing the tightening, use the hydraulic cylinder 4.
．． The oil diverted by the diversion valve 48 is sent to the 4° head side. In this case, the amount of oil sent to the left and right hydraulic cylinders 4.4'' will be slightly different due to an error in the flow dividing precision of the flow dividing valve 48 itself, and therefore the respective extension speeds will also be slightly different. Now, for example, when the right hydraulic cylinder 4 degrees is extended to the end first, and the left hydraulic cylinder 4 is in the middle of extension, pressure oil enters the head side of the hydraulic cylinder 4 and tries to push out the oil on the piston rod side. Therefore, the oil pressure in the oil passages 52, 51, 66 increases and the relief valve 67 is opened. Therefore, the oil on the piston rod side of the hydraulic cylinder 4 is
6, Relief valve 67, oil tank 5 through oil passage 68, 69
Return to 9. Therefore, the hydraulic cylinder 4 can also be extended to the end and stopped. Therefore, when tightening or opening the hollow pipe, the above circuit ensures that the hydraulic pressure is maintained even if either the left or right hydraulic cylinder reaches the end of its contraction or extension first due to an error in the flow dividing accuracy of the flow dividing valve. By operating the cylinder, the inner beams 3.3'' on both the left and right sides can be moved. Note that 70 is a prime mover for driving the hydraulic pump 40.

Effects of the Invention As described above, the lifting device having the safety confirmation device of the present invention is capable of lifting all the hooks by the left and right hydraulic cylinders in the main beam and the hydraulic cylinders in the auxiliary beam when lifting multiple hollow tubes of different lengths. At the same time as both ends of the hollow tube are securely tightened, all hook tightening hydraulic cylinders stop operating, so damage to the ends of the hollow tube due to excessive tightening can be prevented. In addition, all the hooks can be opened in the correct order, reliably, and safely when lifting.

Therefore, by using the safety confirmation device of this lifting tool, it is possible to reliably suspend a plurality of hollow pipes of different lengths at once, thereby improving the efficiency and safety of hollow pipe cargo handling operations.

[Brief explanation of the drawing]

Figure 1 is a front view of the main hanging tool, Figure 2 is a view seen from A in Figure 1, Figure 3 is a partial view seen from B in Figure 2, and Figures 4 and 5 are views from Figure 1. Figures 6 and 7 are partial views of the case seen from D in Figure 1, Figure 8 is a detailed view of the hook' device, Figures 9 and 1O are each hook. Electrical diagram of the limit switch installed in the 11th
The figure is a hydraulic circuit diagram of the present lifting device, Fig. 12 is a perspective view of the operating panel for the lifting device, Fig. 13 is a front view of the conventional lifting device, and Figs. 14 and 15 are an example part seen from E in Fig. 13. FIG. 16 is a hydraulic circuit diagram of a conventional lifting device. 1・・・・・・・・・・・・・・・Frame 2・・・・
・・・・・・・・・・・・Main beam 3.3”・・・・
・・・・・・Inner beam 4.4”・・・・・・・・・
...Hydraulic cylinder 5.5°...Support girder 8.8゛...Auxiliary beam 9...
・・・・・・・・・・・・Hydraulic cylinder 11.11°
......Hook device 12.12'...
...Hook device 13.13''...Hook device 17...Hook 27
．． 32.・・・・・・・・・Limit switch 33.3
4・・・・・・・・・・Limit switch 35.36
．． 37...Limit switch 40...
......Hydraulic pump 42...
...3 position it M1 valve 43...
・・・・Operation panel 44 for lifting device ・・・・・・・・・・・
...Hook tightening lever 48...
...Diversion valve 50.50°, 63...Check valve with pilot 55.61...Sequence valve with check valve 67.67°...・More than relief valve

Claims (1)

[Claims] (1) Inner beams are slidably inserted into both left and right sides of the main beam that has hanging fittings on the top, and a plurality of auxiliary beams are provided on the inner beam via support girders, and each of the auxiliary beams can be moved. A safety confirmation device for a long object, characterized in that a limit switch for detecting the state of the hook is attached to each hook device, and each limit switch is arranged in series, in the long object hoist having a hook device attached thereto.