JP2018111609A - Lifting device of hanging load - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lifting device capable of being returned to a condition where next hanging load work is possible automatically when hanged down as well as of correcting a position of that hanging load to a horizontal state easily and exactly on lifting a hanging load such as a container etc by a crane.SOLUTION: Several cables which has a definite length to have an upper end hanged by a crane and to couple a lower end to both ends of the hanging load detachably, a correction mechanism 3 which has a liquid pressure cylinder 4a arranged in these cables to extend the piston rod 4a3 to correct an inclination of the hanging load to a horizontal state when the hanging load hanged by a crane inclines and a tension spring 8a which is always attached to the liquid pressure cylinder 4a in a direction where the piston rod 4a3 is retracted and makes the piston rod 4a3 return to an original position when there is no load of the hanged load are provided.SELECTED DRAWING: Figure 2

Description

  In the present invention, when a load such as a container (hereinafter referred to as a suspended load) is lifted, when the suspended load is inclined, the horizontal load can be easily corrected and the load of the suspended load is reduced. The present invention relates to a lifting device for a suspended load having a function capable of automatically returning to an original state when it is lost.

  Conventionally, in order to lift a suspended load such as a container accumulated at a certain place by a crane and hang it at a predetermined place, the upper ends of a plurality of ropes such as one wire are hung on the hanging hook of the crane, and these The suspended load is supported by the rope, but if the position of the center of gravity of the suspended load is biased to the one side from the center of the length or width of the suspended load, the suspended load is lifted in an inclined state. A situation occurs where the suspended load posture becomes unstable. For this reason, for example, as described in Patent Document 1, a suspended load lifting device including a suspended load attitude correction mechanism has been developed.

  The suspended load attitude correction mechanism is provided with a hydraulic cylinder or other hydraulic cylinder on the rope that supports the suspended load, and when the suspended load lifted by the crane tilts, The piston rod of the hydraulic cylinder provided on the connected rope is extended from the cylinder tube, and the upward slant end side of the suspended load is moved downward according to the amount of extension. It is configured to do.

  Further, in the lifting device for a suspended load, a return leg member for the piston is integrally attached to the piston rod of the hydraulic cylinder in the posture correction mechanism. After the suspended load is suspended, the return leg member is By grounding or the like, the piston rod is moved up to return to the original position, and is prepared for lifting of the next suspended load.

JP 2009-256062 A

  However, according to the lifting device for a suspended load, the posture of the suspended load is corrected horizontally by extending the piston rod of the posture correcting mechanism provided on the suspension rope for the suspended load from the cylinder tube. As a means to return the piston rod to its original position after unloading the suspended load, a return leg member is attached to the piston rod, and the return leg member is placed on the grounding surface or the like. Since the piston rod is configured so that its own weight is applied to the piston rod, it takes time to return the piston rod to its original position, which lowers the efficiency of the lifting work, and during that time the suspended work is suspended. Therefore, there is a problem that continuous lifting work cannot be performed.

  The present invention has been made in view of such problems, and the purpose of the present invention is to make the suspended load easy and accurate in a horizontal state when the suspended load is lifted in an inclined state. It is possible to provide a lifting device for a suspended load that can be corrected so that it can be immediately and automatically returned to a state where the next lifting operation can be performed when the suspension is suspended.

  In order to achieve the above object, the lifting device for a suspended load according to the present invention has a fixed length in which the upper end is connected to the crane side and the lower end is detachably connected to both ends of the suspended load. And a hydraulic cylinder that adjusts the inclination of the suspended load to a horizontal state by extending its piston rod when the suspended load lifted by the crane is tilted. A lifting device for a suspended load comprising a correction mechanism having the above-described correction mechanism is characterized in that the hydraulic cylinder is provided with an expansion / contraction mechanism that constantly urges the piston rod in a contracting direction.

  In the lifting device for a suspended load configured as described above, the invention according to claim 2 is characterized in that the correction mechanism for correcting the inclination of the suspended load to a horizontal state uses the rope connected to the crane side as the upper rope. A hydraulic cylinder disposed in a suspension frame suspended from the lower end of the rope, and a piston rod that connects the lower end to the end of the suspended load and extends and contracts the upper end downward in the hydraulic cylinder. A lower cable connected to the lower end, a conduit communicating between the upper and lower chambers in the cylinder tube of the hydraulic cylinder partitioned by the piston, and a pipe provided in the conduit and operated by remote operation An electromagnetic valve and a check valve for preventing the liquid in the lower chamber from flowing into the upper chamber are provided.

  According to a third aspect of the present invention, the expansion / contraction mechanism includes a tension spring, the upper end of the tension spring is supported by the upper end of the suspension frame, and the lower end of the piston rod protrudes downward from the cylinder tube. It is connected to the lower end.

  The invention according to claim 4 is a lifting device having a structure different from that of the lifting device for a suspended load, the suspension frame having a locking portion for locking the hook of the crane at the center of the upper surface, and the lower end of the lifting device. Several ropes having a fixed length that are detachably connected to both ends of the load, and the rope that is fixed in parallel to the suspension frame and connected to one end side and the other end side of the suspension load First and second correction mechanisms having hydraulic cylinders that connect the upper ends of the strips to the respective piston rods to correct the inclination of the suspended load in a horizontal state, and the liquids of these first and second correction mechanisms The pressure cylinder is provided with an expansion / contraction mechanism that urges the piston rod to always return to the original position when the hydraulic cylinder is operated.

  In the lifting device for a suspended load configured as described above, the device according to claim 5 is configured such that the first and second correction mechanisms for correcting the inclination of the suspended load to a horizontal state are hydraulic cylinders partitioned by a piston. A pipe line that communicates between the upper and lower chambers in the cylinder tube, an electromagnetic valve that is provided in the pipe line and that is operated by remote operation to open and close the pipe line, and the liquid in the lower chamber is placed in the upper chamber. And a check valve for preventing the fluid from flowing.

  According to a sixth aspect of the present invention, the telescopic mechanism comprises a tension spring, the upper end of the tension spring is fixed to the upper frame portion of the suspension frame, and a connecting piece is attached to the lower end. The lower end of the piston rod of the hydraulic cylinder of the correction mechanism is connected by a connecting wire having a certain length.

  According to the first aspect of the present invention, there are several ropes having a certain length that connect the upper end to the crane side and detachably connect the lower end to both ends of the suspended load, and these ropes are provided on these ropes. When the suspended load lifted by the crane is tilted, it is equipped with a correction mechanism that has a hydraulic cylinder that extends the piston rod and corrects the tilt of the suspended load to a horizontal state. When the operator observes the tilted state, the piston rod of the hydraulic cylinder connected to the upwardly inclined end side of the suspended load via the rope is extended by remote operation, The posture of the load can be easily and accurately corrected horizontally.

  Furthermore, since the hydraulic cylinder in the correction mechanism is provided with an expansion / contraction mechanism that constantly biases the piston rod in the contracting direction, the suspended load is suspended at a predetermined place and the hydraulic cylinder of the correction mechanism is used. When the load of the suspended load disappears, the piston rod can be automatically and quickly contracted to the original position by the restoring force of the expansion mechanism, and the preparation for the next suspended load operation is completed. It can be carried out continuously and efficiently.

  According to the second aspect of the present invention, the correction mechanism that corrects the inclination of the suspended load to the horizontal state is a suspension that is suspended from the lower end of the upper cable with the cable connected to the crane as the upper cable. A hydraulic cylinder disposed in the frame, and a lower rope connecting the lower end to the end of the suspended load and connecting the upper end to the lower end of a piston rod extending and contracting downward in the hydraulic cylinder; A pipe line that communicates between the upper and lower chambers in the cylinder tube of the hydraulic cylinder partitioned by the piston, an electromagnetic valve that is provided in the pipe line and that is operated by remote operation, and a liquid in the lower chamber Is provided with a check valve that prevents the fluid from flowing into the upper chamber, so that the piston rod of the hydraulic cylinder can be extended with a stable operation, and the posture of the suspended load can be corrected remotely. It can be carried out smoothly and places suspended loads. When the load on the hydraulic cylinder is suspended after being suspended at a place, the piston in the upper chamber of the hydraulic cylinder flows into the lower chamber through the check valve by the restoring force of the expansion and contraction mechanism. The rod can be automatically and smoothly returned to the original position.

  According to a third aspect of the present invention, the expansion / contraction mechanism includes a tension spring, the upper end of the tension spring is supported by the upper end of the suspension frame, and the lower end of the piston rod protrudes downward from the cylinder tube. Since it is connected to the lower end portion, it is possible to provide a telescopic mechanism having a simple structure that can withstand long-term use using a tension spring.

  According to the lifting device for a suspended load according to claim 4, the suspension frame provided with the engaging portion for engaging the hook of the crane at the center of the upper surface and the lower end are detachably connected to both ends of the suspended load. A plurality of strips having a certain length and fixed to the suspension frame in parallel, and the upper ends of the strands connected to one end side and the other end side of the suspended load are respectively connected to the piston rods. The first and second correction mechanisms having hydraulic cylinders that are connected to each other and correct the inclination of the suspended load in a horizontal state are provided. Therefore, the suspension is provided with the first and second correction mechanisms in use. By locking the upper edge locking part of the frame to the hook of the crane, it is easy to prepare for the lifting work, and when the suspended load is tilted, the worker can visually Connected to the end side inclined upward in the cable The piston rod of the hydraulic cylinder of the first or second correction mechanism by extending by remote control, it is possible to correct the posture of the suspended load to easily and precisely horizontally.

  Furthermore, since the hydraulic cylinders of the first and second correction mechanisms are provided with an expansion / contraction mechanism that urges the piston rod to always return to the original position when the hydraulic cylinder is operated. If the suspended load is hung in place and the hydraulic cylinder of the correction mechanism is no longer loaded, the restoring force of the expansion / contraction mechanism can automatically and quickly retract the piston rod to its original position. It is possible to immediately move to the next suspended load operation, and therefore the suspended load operation can be performed continuously and efficiently.

  According to the fifth aspect of the present invention, the first and second correction mechanisms for correcting the slant of the suspended load in a horizontal state communicate between the upper and lower chambers in the cylinder tube of the hydraulic cylinder partitioned by the piston. A conduit, an electromagnetic valve provided in the conduit and operated by remote operation to open and close the conduit, and a check valve for preventing liquid in the lower chamber from flowing into the upper chamber Since the piston rod of the hydraulic cylinder in the first and second correction mechanisms can be extended with a stable operation, the posture of the suspended load can be smoothly corrected by remote operation. When the suspended load is suspended at a predetermined location and the load on the hydraulic cylinder disappears, the restoring force of the expansion mechanism causes the liquid in the upper chamber of the hydraulic cylinder to flow into the lower chamber through the check valve. While the piston rod is It can be automatically and smoothly return to the location.

  According to the device of claim 6, the expansion / contraction mechanism comprises a tension spring, the upper end of the tension spring is fixed to the upper frame portion of the suspension frame, and a connecting piece is attached to the lower end. When the lower end of the piston rod of the hydraulic cylinder of the second correction mechanism is connected by a connecting rope having a fixed length, the inclined correction load is corrected to a horizontal state by operating the first correction mechanism. Even in the case where the suspended load inclined by operating the second correction mechanism is corrected to the horizontal state, the extension mechanism can be extended in common with the first and second correction mechanisms, and When the suspended load is suspended in place and the load on the hydraulic cylinder disappears, the piston rod of the correction mechanism can be returned to its original position by the restoring force of the expansion / contraction mechanism. Preparation of It can be quickly performed.

The simplified perspective view of the hanging load lifting apparatus of this invention. The simplified longitudinal cross-sectional view of the part provided with the correction mechanism and the expansion-contraction mechanism. The simplified front view of the suspended load lifted in the inclined state. The simplified perspective view of the hanging load lifting apparatus which has another structure of this invention. The simplified vertical front view of the part provided with the correction mechanism and the expansion-contraction mechanism. The side view. The simplified front view of the apparatus which lifted the suspended load in the inclined state. The simplified front view of the state corrected horizontally by the correction mechanism. The simplified longitudinal front view which shows the operation state of the correction mechanism and the expansion-contraction mechanism part. The simplified perspective view of the whole apparatus which correct | amended the suspended load so that it might become a horizontal state.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, a luggage such as a container and other articles (hereinafter referred to as a suspended load B) are lifted and moved to a predetermined place. The load lifting device A includes a correction mechanism 3 for correcting the lifted suspended load B so as to be in a horizontal state, and a telescopic mechanism 8 for returning the operated correction mechanism 3 to the original state. 2 is composed of a plurality (four in the figure) of ropes 1 having a certain length arranged in the middle part in the longitudinal direction, and the upper ends of these ropes 1 are processed by eye processing. It is formed in a hanging ring portion 1a for hanging the hook C.

  In addition, a wire rope is used as the above-mentioned rope 1, and a fixed-length rope 1 made of this wire rope is divided into an upper rope 1A and a lower rope 1B, and the lower and lower sides of the upper rope 1A. The above suspension frame 2 is disposed between the upper end of the rope 1B, and the lower end of the upper rope 1A is connected to the center of the upper end of the suspension frame 2 by connecting or the like. It is connected to the correction mechanism 3 side.

As shown in FIG. 2, the correction mechanism 3 includes a hydraulic cylinder 4a such as a hydraulic cylinder disposed and fixed in the lower half of the suspension frame 2 suspended from the lower end of the upper cable 1A. The lower end is connected to the end of the suspended load B, and the upper end is connected to the lower end of the piston rod 4a3 extending and contracting downward of the piston 4a2 in the cylinder tube 4a1 in the hydraulic cylinder 4a by a connecting ring or the like. Upper and lower chambers 4-1 in the cylinder tube 4a1 partitioned by the side cable 1B and the piston 4a2
4-2, and a pipe line 5 communicating with each other, and provided in the pipe line 5 to open and close the pipe line 5, and only from the lower chamber 4-2 to the upper chamber 4-1 A solenoid valve 6 that allows the flow of pressurized fluid (pressure oil), another pipe line 5 ′ that communicates between the upper and lower chambers 4-1 and 4-2 in the cylinder tube 4a1, and a pipe line 5 ′. And a check valve 7 that allows the flow of pressurized liquid from the upper chamber 4-1 to the lower chamber 4-2 and blocks the flow in the reverse direction.

  The diameter of the pipe line 5 ′ provided with the check valve 7 is larger than the diameter of the pipe line 5 provided with the electromagnetic valve 6, and the suspension frame is configured as described above. When the piston rod 4a3 extended when 2 is corrected from the tilted state to the horizontal state is returned to the original state, the resistance of the liquid flowing in the pipe line 5 'is reduced and quickly returned. In addition, a bypass line may be provided in the pipe line 5 provided with the electromagnetic valve 6 so as to be parallel to the electromagnetic valve 6, and the check valve 7 may be provided in this pipe line.

  The expansion / contraction mechanism 8 includes a tension spring 8a that contracts the piston rod 4a3 and returns the piston to its original position when the piston rod 4a3 extends downward from the cylinder tube 4a1, and the upper end of the tension spring 8a. Is connected to and supported by an upper bracket 8b that protrudes horizontally from the upper end of the suspension frame 2 toward the one side, and the lower end of the suspension rod 2 protrudes downward from the cylinder tube 4a1 from the lower end of the piston rod 4a3. It is connected to and supported by a lower bracket 8c projecting laterally. In FIG. 2, the tension spring 8a and the lower bracket 8c (which may be the upper bracket 8b) are connected by a flexible string-like member 9 made of a chain or the like. The flexible string-like member 9 can adjust the tensile force of the tension spring 8a for returning the piston by changing its length.

  The usage mode of the suspended load lifting device for articles and the like configured as described above will be described. The upper hanging ring portion 1a of the upper rope 1A of the four ropes 1 of the lifting device A is hooked and locked on the hook C of the crane. At the same time, the lower ends of these ropes 1, that is, the lower ends of the lower ropes 1B, are detachably attached to the front, rear, left and right ends (corner corners) of the suspended load B by detachment, etc., and then the crane is operated. The suspended load B is lifted as shown in FIG.

  When the suspended load B is lifted by the crane, the hydraulic pressure that constitutes the correction mechanism 3 via the lower strand 1B of the four strands 1 in which the load of the suspended load B suspends the suspended load B is supported. An electromagnetic valve 6 provided in a pipe line 5 between the upper and lower chambers 4-1 and 4-2 of the hydraulic cylinder 4a acts on the piston rod 4a3 of the cylinder 4a in a direction to lower the piston rod 4a3. Is closed, and the check valve 7 provided in another pipe 5 'prevents the hydraulic pressure from flowing from the lower chamber 4-2 to the upper chamber 4-1 so that the piston rod The suspended load B is lifted through the four-way ropes 1 in which the length between the upper and lower ends is kept constant without the 4a3 moving downward.

  At this time, if the center of gravity of the suspended load B is eccentric from the center in the length direction of the suspended load B (left and right direction in FIGS. 1 and 3) toward one end, the center of gravity is below the hook C of the crane vertically. As shown in FIG. 3, the suspended load B is lifted via the four-way cable 1 in a posture inclined obliquely upward from one end side (right end side) to the other end side (left end side). It becomes.

  In this way, when the suspended load B is lifted in an inclined state, the operator confirms the inclined posture of the suspended load B by visual observation, and the correction mechanism provided on the rope 1 by remote operation by the remote controller 15. 3 is operated, and the suspended load B is corrected so as to have a stable posture in a horizontal state as indicated by a two-dot chain line.

  Specifically, when the suspended load B is lifted in an inclined state as described above due to the unbalanced load of the suspended load B, the rope 1 that supports the upper inclined end side (the other end side) of the suspended load B is suspended. The electromagnetic valve 6 of the correction mechanism 3 is switched by the remote controller 15, and the pipe line 5 connecting the upper and lower chambers 4-1 and 4-2 in the cylinder tube 4a1 of the hydraulic cylinder 4a of the correction mechanism 3 is opened. . When the pipe 5 is opened, the upper and lower chambers 4-1 and 4-2 communicate with each other, and the piston 4a2 of the hydraulic cylinder 4a is moved downward by the load of the suspended load B applied to the piston rod 4a3. While the pressurized liquid in the chamber 4-2 is sent to the upper chamber 4-1 through the pipe 5 and the tension spring 8a of the expansion / contraction mechanism 8 is extended, the piston rod 4a3 extends downward from the cylinder tube 4a1. Then, the lower rope 1B connected to the piston rod 4a3 is moved downward.

  Accordingly, the suspension fulcrum of the lower rope 1B that suspends the suspended load B, that is, the upper inclined end portion of the suspended load B that is inclined upward from one end side toward the other end side is suspended. The suspension fulcrum moves downward with the suspension fulcrum of the cable 1 on one end side as a fulcrum, and the suspended load B is corrected to a horizontal posture. After this state, the solenoid valve 7 is switched by remote operation to return to the original position, and the communication between the upper and lower chambers 4-1 and 4-2 of the hydraulic cylinder 4a is blocked.

  In this way, when the suspended load B is horizontally corrected, the suspended load B is transferred to a predetermined location by a crane, suspended at that position and grounded, etc., the hydraulic load acting on the hydraulic cylinder 4a of the correcting mechanism 3 is applied. The load of the suspended load B is released, and the piston rod 4a3 of the correction mechanism 3 that has been extended by the load is contracted by the restoring force of the tension spring 8a, and the piston 4a2 is moved to the upper side of the cylinder tube 4a1 by the contraction. The pressure fluid in the chamber 4-1 is returned to the original position while returning the pressure fluid in the chamber 4-2 through the pipe line 5 'to prepare for the next lifting operation.

  In the above-described embodiment, four ropes 1 having the correction mechanism 3 are used, and the lower ends thereof are connected to the four corners of the upper surface of the suspended load B by connection or the like. The rope 1 provided with the correction mechanism 3 may be lifted by using two, three or more. Also, two lower ropes 1B connected to the lower end of the piston rod 4a3 of one correction mechanism 3 may be used.

  Next, FIGS. 4 to 6 show another structure of the lifting device of the present invention. This lifting device A ′ has a locking hole which is locked to the hook C of the crane at the center of the upper surface. A suspension frame 2 provided with a portion 2f, and several (four in the figure) wire ropes having a fixed length that detachably connect the lower end to the front, rear, left and right ends (corner corners) of the suspended load B The above-mentioned cord 1 fixed in parallel in the above-mentioned hanging frame 2 and the above-mentioned cord connected at one end side and the other end side in the length direction (left-right direction in the figure) of the hanging load B 1 is provided with hydraulic cylinders 4a and 4b, each of which has an upper end connected to each piston rod (upper piston rods 4a3 and 4b3, which will be described later) and corrects the inclination of the suspended load to a horizontal state by the operation of the piston rod. , Second correction mechanisms 3A, 3B and the first and second correction mechanisms 3A, 3B And a telescopic mechanism biases 8 'in the direction of returning always original position rod.

  The suspension frame 2 is formed in a rectangular frame shape by integrally connecting the top plate 2a and the bottom plate 2b with left and right guide members 2c, 2d and a central guide member 2e having a certain length. 2, the hydraulic cylinders 4a and 4b of the first and second correction mechanisms 3A and 3B are arranged side by side on the bottom plate 2b and fixed on the bottom plate 2b.

  These hydraulic cylinders 4a and 4b are respectively connected to the upper piston rods 4a3 and 4b3 in the vertical direction at the center of the upper and lower surfaces of the pistons 4a2 and 4b2 disposed in the cylinder tubes 4a1 and 4b1, respectively. And the lower piston rods 4a4 and 4b4 project from the cylinder tubes 4a1 and 4b1 at the tips (upper ends) of the upper piston rods 4a3 and 4b3, and the right guide member 2c and the central guide member 2e. The rope locking heads 10a and 10b that move up and down in the upper half of the suspension frame 2 are fixed by using the opposing surfaces of the left guide member 2d and the central guide member 2e as guides, respectively. ing.

  The upper ends of the two ropes 1 and 1 connected to one end side of the suspension frame 2 are connected to the above-mentioned rope locking head 10a fixed to the upper end of the upper piston rod 4a3 in one hydraulic cylinder 4a. Two ropes connected to the other end side of the suspension frame 2 on the rope locking head 10b fixed to the upper end of the upper piston rod 4b3 in the other hydraulic cylinder 4b. 1, 1 is supported by locking the upper end portion.

  In the hydraulic cylinders 4a and 4b, the upper and lower chambers 4-1 and 4-2 in the cylinder tubes 4a1 and 4b1 separated by the pistons 4a2 and 4b2 are communicated with each other by a pipe line 5 in the same manner as in the above embodiment. An electromagnetic valve 6 that opens and closes the pipe 5 and allows the flow of pressure fluid (pressure oil) only from the lower chamber 4-2 to the upper chamber 4-1 is provided in the pipe 5. Further, a bypass pipe 5 'is provided in the pipe 5 so as to be parallel to the electromagnetic valve 6, and the bypass pipe 5' is provided on the side of the lower chamber 4-2 from the upper chamber 4-1. There is provided a check valve 7 that allows the flow of the pressure fluid to and blocks the flow in the reverse direction. The electromagnetic valve 6 can be opened and closed by remote operation by the controller 15 as in the above embodiment.

  As shown in FIGS. 5 and 6, the expansion / contraction mechanism 8 'includes two piston return tension springs 11a provided on the left and right sides of the front side (front side) and the back side (rear side) of the suspension frame 2, respectively. 11b a is provided, and the upper ends of the front-side tension springs 11a and 11b and the rear-side tension springs 11a and 11b are respectively connected to the upper end of the suspension frame 2, that is, the front and rear surfaces of the top plate 2a via brackets or the like. Further, the lower ends of the front-side tension springs 11a and 11b and the lower ends of the rear-side tension springs 11a and 11b are connected by connecting pieces 12a and 12b, respectively. .

  Further, the center portions of the upper surfaces of the elongated rectangular left and right brackets 13a and 13b extending in the front-rear direction are respectively provided at the lower ends of the lower piston rods 4a4 and 4b4 protruding downward from the cylinder tubes 4a1 and 4b1 in the hydraulic cylinders 4a and 4b. The lower ends of the left and right connecting ropes 14a, 14b made of a chain, a rope, etc. having a fixed length are attached to the front ends of the left and right brackets 13a, 13b, and the connecting ropes are attached. The upper ends of the objects 14a and 14b are attached to the center of the connecting piece 12a connecting the lower ends of the front side tension springs 11a and 11b, and the connecting piece 12a and the front ends of the left and right brackets 13a and 13b are connected. It is connected by the ropes 14a and 14a.

  Similarly, a chain having the same length as the connecting cords 14a and 14b at the rear end portions of the left and right brackets 13a and 13b fixed to the lower ends of the lower piston rods 4a3 and 4b3 in the hydraulic cylinders 4a and 4b. The lower ends of the left and right connecting ropes 14a, 14b made of rope, etc. are attached, and the upper ends of the connecting ropes 14a, 14b are connected between the lower ends of the tension springs 11a, 11b on the rear side. Attached to the central portion of the connecting piece 12b, the connecting piece 12b and the rear ends of the left and right brackets 13a, 13b are connected by connecting ropes 14a, 14b. Note that these connecting ropes 14a and 14b are normally tensioned by the tensile force of the tension springs 11a and 11b.

  The usage mode of the suspended article lifting apparatus A ′ for articles and the like configured as described above will be described. The upper piston rods 4a3 and 4b3 projecting upward from the cylinder tubes 4a1 and 4b1 in the first and second hydraulic cylinders 4a and 4b. The top rope locking heads 10a and 10b are connected to each other by locking the upper ends of the two ropes 1 and 1, respectively, and are connected to the tip rope locking head 10a of one upper piston rod 4a3. The lower ends of the two ropes 1 and 1 to be stopped are attached to the front and rear corners at one end of the suspended load B, and are locked to the tip rope locking head 10b of the other upper piston rod 4b3. The lower ends of the two ropes 1 and 1 are connected to the front and rear corners at the other end of the suspended load B.

  Further, after hooking the hook C of the crane to the locking portion 2f projecting from the top surface 2a of the suspension frame 2 of the lifting device A ′, the crane is operated and FIG. Lift suspended load B as shown.

  When the suspended load B is lifted by the crane, the hydraulic cylinder is configured such that the load of the suspended load B is locked from the four ropes 1 that support the suspended load B to the upper ends of these ropes 1. The upper piston rods 4a3, 4b of 4a, 4b are applied to the rope locking heads 10a, 10b of the upper piston rods 4a3, 4b3, and act in a direction to lower these upper piston rods 4a3, 4b3, but hydraulic cylinders 4a, 4b The lower valve 4-2 is closed by a check valve 7 provided in another pipe line 5 'while the electromagnetic valve 6 provided in the pipe line 5 between the upper and lower chambers 4-1 and 4-2 is closed. Since the flow of the hydraulic pressure from the side to the upper chamber 4-1 is blocked, the suspended load B is lifted through the four ropes 1 without the piston rods 4a3, 4b3 moving down.

  When the suspended load B is lifted in this way, if the center of gravity of the suspended load B is eccentric from the center in the length direction of the suspended load B (the left-right direction in FIGS. 4 and 7) toward the other end, A four-way cable with the center of gravity positioned vertically below the hook C of the crane and the suspended load B inclined obliquely upward from the other end side (left end side) to one end side (right end side) as shown in FIG. It is in a state of being lifted through the strip 1. An operator visually confirms the inclined posture of the suspended load B, and corrects the suspended load B so as to have a stable horizontal posture as shown in FIG.

That is, when the suspended load B is lifted upward from the other end side toward the one end side as described above due to the unbalanced load of the suspended load B, the upward inclined end side (one end side) of the suspended load B is The solenoid valve 6 on the side of the first correction mechanism 3A having the upper piston rod 4a3 suspended from the two ropes 1 is operated by remote control, and the hydraulic cylinder 4a is vertically moved in the cylinder tube 4a1. Room 4-1
, 4-2, open the pipeline 5 connecting the two. When the pipe 5 is opened, the upper and lower chambers 4-1 and 4-2 communicate with each other, and the piston 4a2 of the hydraulic cylinder 4a is lowered by the load of the suspended load B applied to the upper piston rod 4a3. The pressure liquid in the chamber 4-2 is moved downward while being pumped through the pipe line 5 to the upper chamber 4-1. At this time, the second correction mechanism 3B that supports the downwardly inclined end side (the other end side) of the suspended load B is kept in an inoperative state.

When the upper piston rod 4a3 of the first correction mechanism 3A moves downward, the upper piston rod 4a3
The two ropes 1 are connected to one end of the suspended load B, with the upper part of the rope locking head 10a also moved downward integrally to lock the upper edge of the rope locking head 10a. The one suspension fulcrum is connected downward to the piston rod 4b3 of the second correction mechanism 3B and moves downward using the suspension fulcrum of the two ropes 1 and 1 that suspend the other end of the suspended load B as a fulcrum. Then, the suspended load B is corrected in its inclined posture to be horizontal. After this state, the solenoid valve 7 is switched by remote operation to return to the original position, and the communication between the upper and lower chambers 4-1 and 4-2 of the hydraulic cylinder 4a is blocked.

  As described above, when the upper piston rod 4a3 in the hydraulic cylinder 4a of the first correction mechanism 3A moves downward, the lower piston rod 4a4 integrated with the upper piston rod 4a3 via the piston 4a2 is also shown in FIG. As shown in the figure, the bracket 13a is moved downward integrally and fixed to the lower end of the lower piston rod 4a4, and the connecting pieces 12a, 12b at the lower ends of the tension springs 11a, 11b supported by the suspended load B at the upper ends. Is connected downward, and the tension springs 11a and 12b are moved downward according to the amount of downward movement of the lower piston rod 4a3 through the connecting rope 14a. The extension springs 11a and 11b are stretched, and an elastic restoring force is generated to pull the lower piston rod 4a4 upward. On the second correction mechanism 3B side, the other connecting rope 14b connecting the lower end bracket 13b of the lower piston rod 4b4 and the connecting pieces 12a, 12b is extended by the tension springs 11a, 11b. Loose depending on the amount.

  When the suspended load B is inclined upward from the one end side to the other end side, the hydraulic cylinder 4a of the first correction mechanism 3A is deactivated and the second correction mechanism 3B is operated. What is necessary is just to drop the rope 1 of the other end side below.

  Thus, when the suspended load B is moved to a predetermined location by a crane with the posture of the suspended load B corrected to a horizontal position, suspended at that position and grounded, etc., the tension of the rope 1 disappears and 1 The load of the suspended load B acting on the hydraulic cylinder 4a of the correction mechanism 3A is released, and the upper and lower piston rods 4a3 of the first correction mechanism 3A that have been extended by the load are connected to the tension springs 11a and 11b. The piston 4a2 of the first correction mechanism 3A returns the pressurized liquid in the upper chamber 4-1 of the cylinder tube 4a1 to the lower chamber 4-2 through the conduit 5 '. While returning to the original position, prepare for the next lifting operation.

  In the above embodiment, the front side of the suspension frame 2 is used as a tension spring for returning the piston rod of the first or second correction mechanism 3A, 3B that has been operated to correct the inclination of the suspended load B to the original position. Although two are provided in parallel on the rear side and the rear side, the piston rod may be returned to the original position by one tension spring.

A Lifting device B Suspended load C Clean hook 1 Strip 2 Suspension frame 3 Correction mechanism
4a, 4b Hydraulic cylinder 5 Pipe 6 Solenoid valve 7 Check valve 8 Telescopic mechanism
8a Tension spring 9 Flexible string
11a, 11b tension spring
14a, 14b Connected cable

In the present invention , when a load such as a container (hereinafter referred to as a suspended load) is lifted, the suspended load can be easily corrected to a horizontal posture and the load of the suspended load is reduced. The present invention relates to a lifting device for a suspended load having a function capable of automatically returning to an original state when it is lost.

  Conventionally, in order to lift a suspended load such as a container accumulated at a certain place by a crane and hang it at a predetermined place, the upper ends of a plurality of ropes such as one wire are hung on the hanging hook of the crane, and these The suspended load is supported by the rope, but if the position of the center of gravity of the suspended load is biased to the one side from the center of the length or width of the suspended load, the suspended load is lifted in an inclined state. A situation occurs where the suspended load posture becomes unstable. For this reason, for example, as described in Patent Document 1, a suspended load lifting device including a suspended load attitude correction mechanism has been developed.

  The suspended load attitude correction mechanism is provided with a hydraulic cylinder or other hydraulic cylinder on the rope that supports the suspended load, and when the suspended load lifted by the crane tilts, The piston rod of the hydraulic cylinder provided on the connected rope is extended from the cylinder tube, and the upward slant end side of the suspended load is moved downward according to the amount of extension. It is configured to do.

  Further, in the lifting device for a suspended load, a return leg member for the piston is integrally attached to the piston rod of the hydraulic cylinder in the posture correction mechanism. After the suspended load is suspended, the return leg member is By grounding or the like, the piston rod is moved up to return to the original position, and is prepared for lifting of the next suspended load.

JP 2009-256062 A

  However, according to the lifting device for a suspended load, the posture of the suspended load is corrected horizontally by extending the piston rod of the posture correcting mechanism provided on the suspension rope for the suspended load from the cylinder tube. As a means to return the piston rod to its original position after unloading the suspended load, a return leg member is attached to the piston rod, and the return leg member is placed on the grounding surface or the like. Since the piston rod is configured so that its own weight is applied to the piston rod, it takes time to return the piston rod to its original position, which lowers the efficiency of the lifting work, and during that time the suspended work is suspended. Therefore, there is a problem that continuous lifting work cannot be performed.

The present invention has been made in view of such problems, and the object of the present invention is to make the suspended load easy and accurate in a horizontal state when the suspended load is lifted in an inclined state. It is possible to provide a lifting device for a suspended load that can be corrected so that it can be immediately and automatically returned to a state where the next lifting operation can be performed when the suspension is suspended.

In order to achieve the above object, the lifting device for a suspended load according to the present invention has a fixed length in which the upper end is connected to the crane side and the lower end is detachably connected to both ends of the suspended load. And a hydraulic cylinder that adjusts the inclination of the suspended load to a horizontal state by extending its piston rod when the suspended load lifted by the crane is tilted. A lifting device for a suspended load comprising a correction mechanism having the above-described correction mechanism is characterized in that the hydraulic cylinder is provided with an expansion / contraction mechanism that constantly urges the piston rod in a contracting direction.

In the lifting device for a suspended load configured as described above, the invention according to claim 2 is characterized in that the correction mechanism that corrects the inclination of the suspended load to a horizontal state uses the cable connected to the crane side as the upper cable. A hydraulic cylinder disposed in a suspension frame suspended from the lower end of the rope, and a piston rod that connects the lower end to the end of the suspended load and extends and contracts the upper end downward in the hydraulic cylinder. A lower cable connected to the lower end, a conduit communicating between the upper and lower chambers in the cylinder tube of the hydraulic cylinder partitioned by the piston, and a pipe provided in the conduit and operated by remote operation An electromagnetic valve and a check valve for preventing the liquid in the lower chamber from flowing into the upper chamber are provided.

In the invention according to claim 3, the expansion / contraction mechanism includes a tension spring, the upper end of the tension spring is supported by the upper end of the suspension frame, and the lower end of the piston rod protrudes downward from the cylinder tube. It is connected to the lower end.

The invention according to claim 4 is a lifting device having a structure different from that of the lifting device for the suspended load, the suspension frame having a locking portion for locking the hook of the crane at the center of the upper surface, and the lower end of the lifting device. Several ropes having a fixed length that are detachably connected to both ends of the load, and the rope that is fixed in parallel to the suspension frame and connected to one end side and the other end side of the suspension load First and second correction mechanisms having hydraulic cylinders that connect the upper ends of the strips to the respective piston rods to correct the inclination of the suspended load in a horizontal state, and the liquids of these first and second correction mechanisms The pressure cylinder is provided with an expansion / contraction mechanism that urges the piston rod to always return to the original position when the hydraulic cylinder is operated.

In such lifting device suspended load which is constructed, the invention according to claim 5, the first to correct the inclination of the suspended load in the horizontal state, the second correction mechanism, the hydraulic cylinder partitioned by the piston A pipe line that communicates between the upper and lower chambers in the cylinder tube, an electromagnetic valve that is provided in the pipe line and that is operated by remote operation to open and close the pipe line, and the liquid in the lower chamber is placed in the upper chamber. And a check valve for preventing the fluid from flowing.

In the invention according to claim 6, the expansion / contraction mechanism comprises a tension spring, the upper end of the tension spring is fixed to the upper frame portion of the suspension frame, and a connecting piece is attached to the lower end. The lower end of the piston rod of the hydraulic cylinder of the correction mechanism is connected by a connecting wire having a certain length.

According to the first aspect of the present invention , there are several ropes having a fixed length that connect the upper end to the crane side and removably connect the lower end to both ends of the suspended load, and these ropes are provided. When the suspended load lifted by the crane is tilted, it is equipped with a correction mechanism that has a hydraulic cylinder that extends the piston rod and corrects the tilt of the suspended load to a horizontal state. When the operator observes the tilted state, the piston rod of the hydraulic cylinder connected to the upwardly inclined end side of the suspended load via the rope is extended by remote operation, The posture of the load can be easily and accurately corrected horizontally.

  Furthermore, since the hydraulic cylinder in the correction mechanism is provided with an expansion / contraction mechanism that constantly biases the piston rod in the contracting direction, the suspended load is suspended at a predetermined place and the hydraulic cylinder of the correction mechanism is used. When the load of the suspended load disappears, the piston rod can be automatically and quickly contracted to the original position by the restoring force of the expansion mechanism, and the preparation for the next suspended load operation is completed. It can be carried out continuously and efficiently.

According to the invention which concerns on Claim 2, the said correction | amendment mechanism which correct | amends the inclination of a suspended load to a horizontal state makes the rope connected with a crane side the upper line, and is suspended by the lower end of this upper line. A hydraulic cylinder disposed in the frame, and a lower rope connecting the lower end to the end of the suspended load and connecting the upper end to the lower end of a piston rod extending and contracting downward in the hydraulic cylinder; A pipe line that communicates between the upper and lower chambers in the cylinder tube of the hydraulic cylinder partitioned by the piston, an electromagnetic valve that is provided in the pipe line and that is operated by remote operation, and a liquid in the lower chamber Is provided with a check valve that prevents the fluid from flowing into the upper chamber, so that the piston rod of the hydraulic cylinder can be extended with a stable operation, and the posture of the suspended load can be corrected remotely. It can be carried out smoothly and places suspended loads. When the load on the hydraulic cylinder is suspended after being suspended at a place, the piston in the upper chamber of the hydraulic cylinder flows into the lower chamber through the check valve by the restoring force of the expansion and contraction mechanism. The rod can be automatically and smoothly returned to the original position.

According to a third aspect of the present invention , the expansion / contraction mechanism includes a tension spring, the upper end of the tension spring is supported by the upper end of the suspension frame, and the lower end of the piston rod projects downward from the cylinder tube. Since it is connected to the lower end portion, it is possible to provide a telescopic mechanism having a simple structure that can withstand long-term use using a tension spring.

  According to the lifting device for a suspended load according to claim 4, the suspension frame provided with the engaging portion for engaging the hook of the crane at the center of the upper surface and the lower end are detachably connected to both ends of the suspended load. A plurality of strips having a certain length and fixed to the suspension frame in parallel, and the upper ends of the strands connected to one end side and the other end side of the suspended load are respectively connected to the piston rods. The first and second correction mechanisms having hydraulic cylinders that are connected to each other and correct the inclination of the suspended load in a horizontal state are provided. Therefore, the suspension is provided with the first and second correction mechanisms in use. By locking the upper edge locking part of the frame to the hook of the crane, it is easy to prepare for the lifting work, and when the suspended load is tilted, the worker can visually Connected to the end side inclined upward in the cable The piston rod of the hydraulic cylinder of the first or second correction mechanism by extending by remote control, it is possible to correct the posture of the suspended load to easily and precisely horizontally.

  Furthermore, since the hydraulic cylinders of the first and second correction mechanisms are provided with an expansion / contraction mechanism that urges the piston rod to always return to the original position when the hydraulic cylinder is operated. If the suspended load is hung in place and the hydraulic cylinder of the correction mechanism is no longer loaded, the restoring force of the expansion / contraction mechanism can automatically and quickly retract the piston rod to its original position. It is possible to immediately move to the next suspended load operation, and therefore the suspended load operation can be performed continuously and efficiently.

According to the fifth aspect of the invention , the first and second correction mechanisms for correcting the slant of the suspended load in a horizontal state communicate between the upper and lower chambers in the cylinder tube of the hydraulic cylinder partitioned by the piston. A conduit, an electromagnetic valve provided in the conduit and operated by remote operation to open and close the conduit, and a check valve for preventing liquid in the lower chamber from flowing into the upper chamber Since the piston rod of the hydraulic cylinder in the first and second correction mechanisms can be extended with a stable operation, the posture of the suspended load can be smoothly corrected by remote operation. When the suspended load is suspended at a predetermined location and the load on the hydraulic cylinder disappears, the restoring force of the expansion mechanism causes the liquid in the upper chamber of the hydraulic cylinder to flow into the lower chamber through the check valve. While the piston rod is It can be automatically and smoothly return to the location.

According to the invention which concerns on Claim 6, the said expansion-contraction mechanism consists of a tension spring, the upper end of this tension spring is fixed to the upper frame part of a suspension frame, the connection piece is attached to the lower end, and this connection piece and 1st, When the lower end of the piston rod of the hydraulic cylinder of the second correction mechanism is connected by a connecting rope having a fixed length, the inclined correction load is corrected to a horizontal state by operating the first correction mechanism. Even in the case where the suspended load inclined by operating the second correction mechanism is corrected to the horizontal state, the extension mechanism can be extended in common with the first and second correction mechanisms, and When the suspended load is suspended in place and the load on the hydraulic cylinder disappears, the piston rod of the correction mechanism can be returned to its original position by the restoring force of the expansion / contraction mechanism. Preparation of It can be quickly performed.

The simplified perspective view of the hanging load lifting apparatus of this invention . The simplified longitudinal cross-sectional view of the part provided with the correction mechanism and the expansion-contraction mechanism. The simplified front view of the suspended load lifted in the inclined state. The simplified perspective view of the hanging load lifting apparatus which has another structure of this invention . The simplified vertical front view of the part provided with the correction mechanism and the expansion-contraction mechanism. The side view. The simplified front view of the apparatus which lifted the suspended load in the inclined state. The simplified front view of the state corrected horizontally by the correction mechanism. The simplified longitudinal front view which shows the operation state of the correction mechanism and the expansion-contraction mechanism part. The simplified perspective view of the whole apparatus which correct | amended the suspended load so that it might become a horizontal state.

Next, a specific embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, a baggage such as a container and other articles (hereinafter referred to as a suspended load B) are lifted and moved to a predetermined place. The load lifting device A includes a correction mechanism 3 for correcting the lifted suspended load B so as to be in a horizontal state, and a telescopic mechanism 8 for returning the operated correction mechanism 3 to the original state. 2 is composed of a plurality (four in the figure) of ropes 1 having a certain length arranged in the middle part in the longitudinal direction, and the upper ends of these ropes 1 are processed by eye processing. It is formed in a hanging ring portion 1a for hanging the hook C.

  In addition, a wire rope is used as the above-mentioned rope 1, and a fixed-length rope 1 made of this wire rope is divided into an upper rope 1A and a lower rope 1B, and the lower and lower sides of the upper rope 1A. The above suspension frame 2 is disposed between the upper end of the rope 1B, and the lower end of the upper rope 1A is connected to the center of the upper end of the suspension frame 2 by connecting or the like. It is connected to the correction mechanism 3 side.

As shown in FIG. 2, the correction mechanism 3 includes a hydraulic cylinder 4a such as a hydraulic cylinder disposed and fixed in the lower half of the suspension frame 2 suspended from the lower end of the upper cable 1A. The lower end is connected to the end of the suspended load B, and the upper end is connected to the lower end of the piston rod 4a3 extending and contracting downward of the piston 4a2 in the cylinder tube 4a1 in the hydraulic cylinder 4a by a connecting ring or the like. Upper and lower chambers 4-1 in the cylinder tube 4a1 partitioned by the side cable 1B and the piston 4a2
4-2, and a pipe line 5 communicating with each other, and provided in the pipe line 5 to open and close the pipe line 5, and only from the lower chamber 4-2 to the upper chamber 4-1 A solenoid valve 6 that allows the flow of pressurized fluid (pressure oil), another pipe line 5 ′ that communicates between the upper and lower chambers 4-1 and 4-2 in the cylinder tube 4a1, and a pipe line 5 ′. And a check valve 7 that allows the flow of pressurized liquid from the upper chamber 4-1 to the lower chamber 4-2 and blocks the flow in the reverse direction.

  The diameter of the pipe line 5 ′ provided with the check valve 7 is larger than the diameter of the pipe line 5 provided with the electromagnetic valve 6, and the suspension frame is configured as described above. When the piston rod 4a3 extended when 2 is corrected from the tilted state to the horizontal state is returned to the original state, the resistance of the liquid flowing in the pipe line 5 'is reduced and quickly returned. In addition, a bypass line may be provided in the pipe line 5 provided with the electromagnetic valve 6 so as to be parallel to the electromagnetic valve 6, and the check valve 7 may be provided in this pipe line.

  The expansion / contraction mechanism 8 includes a tension spring 8a that contracts the piston rod 4a3 and returns the piston to its original position when the piston rod 4a3 extends downward from the cylinder tube 4a1, and the upper end of the tension spring 8a. Is connected to and supported by an upper bracket 8b that protrudes horizontally from the upper end of the suspension frame 2 toward the one side, and the lower end of the suspension rod 2 protrudes downward from the cylinder tube 4a1 from the lower end of the piston rod 4a3. It is connected to and supported by a lower bracket 8c projecting laterally. In FIG. 2, the tension spring 8a and the lower bracket 8c (which may be the upper bracket 8b) are connected by a flexible string-like member 9 made of a chain or the like. The flexible string-like member 9 can adjust the tensile force of the tension spring 8a for returning the piston by changing its length.

  The usage mode of the suspended load lifting device for articles and the like configured as described above will be described. The upper hanging ring portion 1a of the upper rope 1A of the four ropes 1 of the lifting device A is hooked and locked on the hook C of the crane. At the same time, the lower ends of these ropes 1, that is, the lower ends of the lower ropes 1B, are detachably attached to the front, rear, left and right ends (corner corners) of the suspended load B by detachment, etc., and then the crane is operated. The suspended load B is lifted as shown in FIG.

  When the suspended load B is lifted by the crane, the hydraulic pressure that constitutes the correction mechanism 3 via the lower strand 1B of the four strands 1 in which the load of the suspended load B suspends the suspended load B is supported. An electromagnetic valve 6 provided in a pipe line 5 between the upper and lower chambers 4-1 and 4-2 of the hydraulic cylinder 4a acts on the piston rod 4a3 of the cylinder 4a in a direction to lower the piston rod 4a3. Is closed, and the check valve 7 provided in another pipe 5 'prevents the hydraulic pressure from flowing from the lower chamber 4-2 to the upper chamber 4-1 so that the piston rod The suspended load B is lifted through the four-way ropes 1 in which the length between the upper and lower ends is kept constant without the 4a3 moving downward.

  At this time, if the center of gravity of the suspended load B is eccentric from the center in the length direction of the suspended load B (left and right direction in FIGS. 1 and 3) toward one end, the center of gravity is below the hook C of the crane vertically. As shown in FIG. 3, the suspended load B is lifted via the four-way cable 1 in a posture inclined obliquely upward from one end side (right end side) to the other end side (left end side). It becomes.

  In this way, when the suspended load B is lifted in an inclined state, the operator confirms the inclined posture of the suspended load B by visual observation, and the correction mechanism provided on the rope 1 by remote operation by the remote controller 15. 3 is operated, and the suspended load B is corrected so as to have a stable posture in a horizontal state as indicated by a two-dot chain line.

  Specifically, when the suspended load B is lifted in an inclined state as described above due to the unbalanced load of the suspended load B, the rope 1 that supports the upper inclined end side (the other end side) of the suspended load B is suspended. The electromagnetic valve 6 of the correction mechanism 3 is switched by the remote controller 15, and the pipe line 5 connecting the upper and lower chambers 4-1 and 4-2 in the cylinder tube 4a1 of the hydraulic cylinder 4a of the correction mechanism 3 is opened. . When the pipe 5 is opened, the upper and lower chambers 4-1 and 4-2 communicate with each other, and the piston 4a2 of the hydraulic cylinder 4a is moved downward by the load of the suspended load B applied to the piston rod 4a3. While the pressurized liquid in the chamber 4-2 is sent to the upper chamber 4-1 through the pipe 5 and the tension spring 8a of the expansion / contraction mechanism 8 is extended, the piston rod 4a3 extends downward from the cylinder tube 4a1. Then, the lower rope 1B connected to the piston rod 4a3 is moved downward.

  Accordingly, the suspension fulcrum of the lower rope 1B that suspends the suspended load B, that is, the upper inclined end portion of the suspended load B that is inclined upward from one end side toward the other end side is suspended. The suspension fulcrum moves downward with the suspension fulcrum of the cable 1 on one end side as a fulcrum, and the suspended load B is corrected to a horizontal posture. After this state, the solenoid valve 7 is switched by remote operation to return to the original position, and the communication between the upper and lower chambers 4-1 and 4-2 of the hydraulic cylinder 4a is blocked.

  In this way, when the suspended load B is horizontally corrected, the suspended load B is transferred to a predetermined location by a crane, suspended at that position and grounded, etc., the hydraulic load acting on the hydraulic cylinder 4a of the correcting mechanism 3 is applied. The load of the suspended load B is released, and the piston rod 4a3 of the correction mechanism 3 that has been extended by the load is contracted by the restoring force of the tension spring 8a, and the piston 4a2 is moved to the upper side of the cylinder tube 4a1 by the contraction. The pressure fluid in the chamber 4-1 is returned to the original position while returning the pressure fluid in the chamber 4-2 through the pipe line 5 'to prepare for the next lifting operation.

  In the above-described embodiment, four ropes 1 having the correction mechanism 3 are used, and the lower ends thereof are connected to the four corners of the upper surface of the suspended load B by connection or the like. The rope 1 provided with the correction mechanism 3 may be lifted by using two, three or more. Also, two lower ropes 1B connected to the lower end of the piston rod 4a3 of one correction mechanism 3 may be used.

Next, FIGS. 4 to 6 show another structure of the lifting device for lifting a load according to the present invention . This lifting device A ′ has a locking hole formed in a central portion of the upper surface and is locked with a hook C of the crane. A suspension frame 2 provided with a portion 2f, and several (four in the figure) wire ropes having a fixed length that detachably connect the lower end to the front, rear, left and right ends (corner corners) of the suspended load B The above-mentioned cord 1 fixed in parallel in the above-mentioned hanging frame 2 and the above-mentioned cord connected at one end side and the other end side in the length direction (left-right direction in the figure) of the hanging load B 1 is provided with hydraulic cylinders 4a and 4b, each of which has an upper end connected to each piston rod (upper piston rods 4a3 and 4b3, which will be described later) and corrects the inclination of the suspended load to a horizontal state by the operation of the piston rod. , Second correction mechanisms 3A, 3B and the first and second correction mechanisms 3A, 3B And a telescopic mechanism biases 8 'in the direction of returning always original position rod.

  The suspension frame 2 is formed in a rectangular frame shape by integrally connecting the top plate 2a and the bottom plate 2b with left and right guide members 2c, 2d and a central guide member 2e having a certain length. 2, the hydraulic cylinders 4a and 4b of the first and second correction mechanisms 3A and 3B are arranged side by side on the bottom plate 2b and fixed on the bottom plate 2b.

  These hydraulic cylinders 4a and 4b are respectively connected to the upper piston rods 4a3 and 4b3 in the vertical direction at the center of the upper and lower surfaces of the pistons 4a2 and 4b2 disposed in the cylinder tubes 4a1 and 4b1, respectively. And the lower piston rods 4a4 and 4b4 project from the cylinder tubes 4a1 and 4b1 at the tips (upper ends) of the upper piston rods 4a3 and 4b3, and the right guide member 2c and the central guide member 2e. The rope locking heads 10a and 10b that move up and down in the upper half of the suspension frame 2 are fixed by using the opposing surfaces of the left guide member 2d and the central guide member 2e as guides, respectively. ing.

  The upper ends of the two ropes 1 and 1 connected to one end side of the suspension frame 2 are connected to the above-mentioned rope locking head 10a fixed to the upper end of the upper piston rod 4a3 in one hydraulic cylinder 4a. Two ropes connected to the other end side of the suspension frame 2 on the rope locking head 10b fixed to the upper end of the upper piston rod 4b3 in the other hydraulic cylinder 4b. 1, 1 is supported by locking the upper end portion.

  In the hydraulic cylinders 4a and 4b, the upper and lower chambers 4-1 and 4-2 in the cylinder tubes 4a1 and 4b1 separated by the pistons 4a2 and 4b2 are communicated with each other by a pipe line 5 in the same manner as in the above embodiment. An electromagnetic valve 6 that opens and closes the pipe 5 and allows the flow of pressure fluid (pressure oil) only from the lower chamber 4-2 to the upper chamber 4-1 is provided in the pipe 5. Further, a bypass pipe 5 'is provided in the pipe 5 so as to be parallel to the electromagnetic valve 6, and the bypass pipe 5' is provided on the side of the lower chamber 4-2 from the upper chamber 4-1. There is provided a check valve 7 that allows the flow of the pressure fluid to and blocks the flow in the reverse direction. The electromagnetic valve 6 can be opened and closed by remote operation by the controller 15 as in the above embodiment.

  As shown in FIGS. 5 and 6, the expansion / contraction mechanism 8 'includes two piston return tension springs 11a provided on the left and right sides of the front side (front side) and the back side (rear side) of the suspension frame 2, respectively. 11b a is provided, and the upper ends of the front-side tension springs 11a and 11b and the rear-side tension springs 11a and 11b are respectively connected to the upper end of the suspension frame 2, that is, the front and rear surfaces of the top plate 2a via brackets or the like. Further, the lower ends of the front-side tension springs 11a and 11b and the lower ends of the rear-side tension springs 11a and 11b are connected by connecting pieces 12a and 12b, respectively. .

  Further, the center portions of the upper surfaces of the elongated rectangular left and right brackets 13a and 13b extending in the front-rear direction are respectively provided at the lower ends of the lower piston rods 4a4 and 4b4 protruding downward from the cylinder tubes 4a1 and 4b1 in the hydraulic cylinders 4a and 4b. The lower ends of the left and right connecting ropes 14a, 14b made of a chain, a rope, etc. having a fixed length are attached to the front ends of the left and right brackets 13a, 13b, and the connecting ropes are attached. The upper ends of the objects 14a and 14b are attached to the center of the connecting piece 12a connecting the lower ends of the front side tension springs 11a and 11b, and the connecting piece 12a and the front ends of the left and right brackets 13a and 13b are connected. It is connected by the ropes 14a and 14a.

  Similarly, a chain having the same length as the connecting cords 14a and 14b at the rear end portions of the left and right brackets 13a and 13b fixed to the lower ends of the lower piston rods 4a3 and 4b3 in the hydraulic cylinders 4a and 4b. The lower ends of the left and right connecting ropes 14a, 14b made of rope, etc. are attached, and the upper ends of the connecting ropes 14a, 14b are connected between the lower ends of the tension springs 11a, 11b on the rear side. Attached to the central portion of the connecting piece 12b, the connecting piece 12b and the rear ends of the left and right brackets 13a, 13b are connected by connecting ropes 14a, 14b. Note that these connecting ropes 14a and 14b are normally tensioned by the tensile force of the tension springs 11a and 11b.

  The usage mode of the suspended article lifting apparatus A ′ for articles and the like configured as described above will be described. The upper piston rods 4a3 and 4b3 projecting upward from the cylinder tubes 4a1 and 4b1 in the first and second hydraulic cylinders 4a and 4b. The top rope locking heads 10a and 10b are connected to each other by locking the upper ends of the two ropes 1 and 1, respectively, and are connected to the tip rope locking head 10a of one upper piston rod 4a3. The lower ends of the two ropes 1 and 1 to be stopped are attached to the front and rear corners at one end of the suspended load B, and are locked to the tip rope locking head 10b of the other upper piston rod 4b3. The lower ends of the two ropes 1 and 1 are connected to the front and rear corners at the other end of the suspended load B.

  Further, after hooking the hook C of the crane to the locking portion 2f projecting from the top surface 2a of the suspension frame 2 of the lifting device A ′, the crane is operated and FIG. Lift suspended load B as shown.

  When the suspended load B is lifted by the crane, the hydraulic cylinder is configured such that the load of the suspended load B is locked from the four ropes 1 that support the suspended load B to the upper ends of these ropes 1. The upper piston rods 4a3, 4b of 4a, 4b are applied to the rope locking heads 10a, 10b of the upper piston rods 4a3, 4b3, and act in a direction to lower these upper piston rods 4a3, 4b3, but hydraulic cylinders 4a, 4b The lower valve 4-2 is closed by a check valve 7 provided in another pipe line 5 'while the electromagnetic valve 6 provided in the pipe line 5 between the upper and lower chambers 4-1 and 4-2 is closed. Since the flow of the hydraulic pressure from the side to the upper chamber 4-1 is blocked, the suspended load B is lifted through the four ropes 1 without the piston rods 4a3, 4b3 moving down.

  When the suspended load B is lifted in this way, if the center of gravity of the suspended load B is eccentric from the center in the length direction of the suspended load B (the left-right direction in FIGS. 4 and 7) toward the other end, A four-way cable with the center of gravity positioned vertically below the hook C of the crane and the suspended load B inclined obliquely upward from the other end side (left end side) to one end side (right end side) as shown in FIG. It is in a state of being lifted through the strip 1. An operator visually confirms the inclined posture of the suspended load B, and corrects the suspended load B so as to have a stable horizontal posture as shown in FIG.

That is, when the suspended load B is lifted upward from the other end side toward the one end side as described above due to the unbalanced load of the suspended load B, the upward inclined end side (one end side) of the suspended load B is The solenoid valve 6 on the side of the first correction mechanism 3A having the upper piston rod 4a3 suspended from the two ropes 1 is operated by remote control, and the hydraulic cylinder 4a is vertically moved in the cylinder tube 4a1. Room 4-1
, 4-2, open the pipeline 5 connecting the two. When the pipe 5 is opened, the upper and lower chambers 4-1 and 4-2 communicate with each other, and the piston 4a2 of the hydraulic cylinder 4a is lowered by the load of the suspended load B applied to the upper piston rod 4a3. The pressure liquid in the chamber 4-2 is moved downward while being pumped through the pipe line 5 to the upper chamber 4-1. At this time, the second correction mechanism 3B that supports the downwardly inclined end side (the other end side) of the suspended load B is kept in an inoperative state.

When the upper piston rod 4a3 of the first correction mechanism 3A moves downward, the upper piston rod 4a3
The two ropes 1 are connected to one end of the suspended load B, with the upper part of the rope locking head 10a also moved downward integrally to lock the upper edge of the rope locking head 10a. The one suspension fulcrum is connected downward to the piston rod 4b3 of the second correction mechanism 3B and moves downward using the suspension fulcrum of the two ropes 1 and 1 that suspend the other end of the suspended load B as a fulcrum. Then, the suspended load B is corrected in its inclined posture to be horizontal. After this state, the solenoid valve 7 is switched by remote operation to return to the original position, and the communication between the upper and lower chambers 4-1 and 4-2 of the hydraulic cylinder 4a is blocked.

  As described above, when the upper piston rod 4a3 in the hydraulic cylinder 4a of the first correction mechanism 3A moves downward, the lower piston rod 4a4 integrated with the upper piston rod 4a3 via the piston 4a2 is also shown in FIG. As shown in the figure, the bracket 13a is moved downward integrally and fixed to the lower end of the lower piston rod 4a4, and the connecting pieces 12a, 12b at the lower ends of the tension springs 11a, 11b supported by the suspended load B at the upper ends. Is connected downward, and the tension springs 11a and 12b are moved downward according to the amount of downward movement of the lower piston rod 4a3 through the connecting rope 14a. The extension springs 11a and 11b are stretched, and an elastic restoring force is generated to pull the lower piston rod 4a4 upward. On the second correction mechanism 3B side, the other connecting rope 14b connecting the lower end bracket 13b of the lower piston rod 4b4 and the connecting pieces 12a, 12b is extended by the tension springs 11a, 11b. Loose depending on the amount.

  When the suspended load B is inclined upward from the one end side to the other end side, the hydraulic cylinder 4a of the first correction mechanism 3A is deactivated and the second correction mechanism 3B is operated. What is necessary is just to drop the rope 1 of the other end side below.

  Thus, when the suspended load B is moved to a predetermined location by a crane with the posture of the suspended load B corrected to a horizontal position, suspended at that position and grounded, etc., the tension of the rope 1 disappears and 1 The load of the suspended load B acting on the hydraulic cylinder 4a of the correction mechanism 3A is released, and the upper and lower piston rods 4a3 of the first correction mechanism 3A that have been extended by the load are connected to the tension springs 11a and 11b. The piston 4a2 of the first correction mechanism 3A returns the pressurized liquid in the upper chamber 4-1 of the cylinder tube 4a1 to the lower chamber 4-2 through the conduit 5 '. While returning to the original position, prepare for the next lifting operation.

  In the above embodiment, the front side of the suspension frame 2 is used as a tension spring for returning the piston rod of the first or second correction mechanism 3A, 3B that has been operated to correct the inclination of the suspended load B to the original position. Although two are provided in parallel on the rear side and the rear side, the piston rod may be returned to the original position by one tension spring.

A Lifting device B Suspended load C Clean hook 1 Strip 2 Suspension frame 3 Correction mechanism
4a, 4b Hydraulic cylinder 5 Pipe 6 Solenoid valve 7 Check valve 8 Telescopic mechanism
8a Tension spring 9 Flexible string
11a, 11b tension spring
14a, 14b Connected cable

Claims (5)

  Several ropes with a certain length that connect the upper end to the crane side and detachably connect the lower end to both ends of the suspended load, and the suspended loads lifted by the crane tilted on these ropes A lifting mechanism for a suspended load comprising a hydraulic cylinder that extends the piston rod to correct the inclination of the suspended load in a horizontal state, and retracts the piston rod to the hydraulic cylinder. A lifting device for a suspended load, characterized in that an expansion / contraction mechanism that is constantly urged in the direction of movement is provided.   The correction mechanism for correcting the inclination of the suspended load to a horizontal state is a hydraulic cylinder disposed in a suspension frame that is suspended at the lower end of the upper line with the line connected to the crane as the upper line. A lower rope connecting the lower end to the end of the suspended load and connecting the upper end to the lower end of the piston rod extending and contracting downward in the hydraulic cylinder, and the hydraulic cylinder partitioned by the piston A pipe line that communicates between the upper and lower chambers of the cylinder tube, an electromagnetic valve that is provided in the pipe line and that is operated by remote control, and prevents the liquid in the lower chamber from flowing into the upper chamber The lifting device for a suspended load according to claim 1, further comprising a check valve that performs the check valve.   The telescopic mechanism includes a tension spring, the upper end of the tension spring is supported by the upper end of the suspension frame, and the lower end is connected to the lower end of the piston rod protruding downward from the cylinder tube. The lifting device for a suspended load according to claim 1.   A hanging frame provided with a locking portion for locking the hook of the crane at the center of the upper surface, several ropes having a fixed length for detachably connecting the lower end to both ends of the suspended load, and the hanging frame A hydraulic cylinder that is fixed in parallel and is connected to one end side and the other end side of the suspended load by connecting the upper ends of the ropes to the respective piston rods and correcting the inclination of the suspended load to a horizontal state. The first and second correction mechanisms having the above and the hydraulic cylinders of the first and second correction mechanisms have their piston rods always returned to their original positions when the hydraulic cylinders are operated. A lifting device for a suspended load, comprising: an expansion / contraction mechanism for energizing.   The first and second correction mechanisms include a pipe line that communicates between upper and lower chambers in a cylinder tube of a hydraulic cylinder partitioned by a piston, and a pipe line that is provided in the pipe line and is operated by remote operation. 5. The lifting device for a suspended load according to claim 4, further comprising: an electromagnetic valve that opens and closes and a check valve that prevents liquid in the lower chamber from flowing into the upper chamber.

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