JP5586573B2 - Crane boom telescopic device - Google Patents

Description

  The present invention relates to a boom boom telescopic device that uses a cylinder unit to expand and contract a multistage telescopic boom.

  A crane equipped with a multistage telescopic boom is also called a telescopic crane, and is often used for a mobile crane (Japanese Patent Laid-Open No. 7-267484).

  In this type of multi-stage telescopic boom, adjacent inner and outer boom members are fixed by a lock pin at a predetermined position of the extended position or the contracted position, and the boom member is held at a predetermined extended position. The lock pin is attached to a base end portion of each boom member that is moved by a single telescopic cylinder unit arranged in the multistage telescopic boom, and is inserted into a lock hole formed in the boom member located outside. Thus, the adjacent inner and outer boom members are connected to each other.

  The lock pin attaching / detaching operation is performed by a lock pin operating device provided at a base end portion of a cylinder tube to which the expansion / contraction cylinder unit moves. When the boom member at each stage is expanded or contracted, the boom member is extended or contracted by a grip mechanism provided at the base end of the cylinder tube that is also moved in the expansion / contraction cylinder unit described above. The lock pin is attached and detached by the lock pin operating device.

JP-A-7-267484

  In the conventional system, both the grip pin driving cylinder and the lock pin operating device are provided at the base end of the moving cylinder tube of the telescopic cylinder unit to extend or contract the boom member. For this reason, there were the following problems.

  First, when extending a boom member, the usage form which expands in order from the direction of the thin boom member used as the front end side located inside is taken. For this reason, only the thin boom member on the distal end side protrudes alone, the load is concentrated on only the thin boom member, and the thick telescopic boom member with the strength on the proximal end side does not contribute much to the support strength, It becomes weak in strength. In particular, when carrying out heavy load work, the extended thin boom member is overloaded, which is disadvantageous in strength.

  In addition, if the base end side thick boom is extended first and used, the tip end side boom cannot be extended continuously. Once it has been contracted, it has to be operated again in order from the boom on the tip side, and the expansion and contraction of the cylinder unit has to be repeated many times, which is inconvenient. Furthermore, in order to carry out heavy load work from the state of the high lift work in which the boom member on the third stage or more from the base end side is extended, the second stage thick boom is extended from the base end side. Even in the case of changing, it is necessary to extend the boom member after once contracting all the boom members to be expanded and contracted.

  For this reason, in the conventional system, it is inconvenient when changing the usage state of the boom member that expands and contracts, requiring complicated operation and a long time for the change work, which is a factor of reducing the work efficiency of the site. It was. Furthermore, in the conventional method, since the boom member is extended in order from the boom member on the distal end side, the friction force increases, so that the load increases as the boom member remaining later is extended, and from the last proximal end side that remains. When the second-stage boom member is extended, the load is highest. Therefore, a large and expensive telescopic cylinder unit with a large thrust must be used, which is uneconomical. Moreover, it is necessary to arrange a large and large telescopic cylinder unit having a large diameter in the multistage telescopic boom, and a large installation space is required in the multistage telescopic boom.

  The object of the present invention is to secure an interlock function that prevents both the lock pin and the grip pin from coming off, and to increase the capacity of the crane, and to make the boom extend and retract operation simple and quick. It is in providing a boom expansion-contraction apparatus.

In order to solve the above-described problems, the present invention provides a boom boom extender for a crane that extends and retracts a multistage extendable boom using a cylinder unit, a base boom supported at a base by a base, and the base boom and the mutual movement. A multi-stage telescopic boom having a plurality of movable booms that can be mounted, and one end connected to the base end side portion of the base boom, and the other end facing the distal end side of the base boom, the multi-stage telescopic boom A boom expansion / contraction drive cylinder unit arranged to extend and contract the other end of the multi-stage telescopic boom, a trunnion block provided at an expansion / contraction side portion of the boom expansion / contraction drive cylinder unit, and the trunnion block A grip member that can be projected and retracted from a side wall of the trunnion block, and a piston and a cylinder in the trunnion block. The piston is configured integrally with the grip member, and both the position where the piston retracts the grip member to the trunnion block side and the position where the piston moves from the side wall of the trunnion block to hold the moving boom. A grip member driving cylinder unit capable of moving the moving boom by extending and retracting the boom telescopic driving cylinder unit while the moving boom is held by the grip member. At least one base boom is provided, and a movable boom other than the top boom is provided with a plurality of lock engaging portions that are provided apart from each other in the direction in which the movable boom extends and retracts. When it is aligned with the position of the lock engaging part formed on the adjacent boom located outside A lock member that can be engaged with the lock engagement portion and can be detached from the state engaged with the lock engagement portion, and is provided on the trunnion block, and the connection from the position where the lock member connects the booms to each other. An engagement / disengagement device capable of operating the lock member at a position to release the state, and a movement in the same first direction as the movement direction of the lock member provided on the trunnion block and moved by the engagement / disengagement device A first interlock member that is operated to move following the lock member when the locked state by the lock member is released and the one end side portion is moved into the trunnion block; and the trunnion block. The trunnion is driven in the second direction, which is the same as the moving direction of the grip member, by the grip member driving cylinder unit. A second interlock member that moves within the trunnion block, and a second interlock member that moves within the trunnion block in the same manner as a region in which the one end side portion of the first interlock member moves within the trunnion block. The region where the member portion moves intersects, and the first interlock member and the second interlock member interfere with each other in the intersecting region, so that the first interlock member and the second interlock. Members can be prevented from entering the region at the same time, and only one of the first interlock member and the second interlock member can be located in the intersecting region in the trunnion block; An interface that prevents the boom holding by the grip member and the boom connection by the locking member from being simultaneously released. A boom extension / contraction device for a crane having a lock mechanism.

  According to the present invention, it is possible to secure an interlock function that prevents both the lock pin and the grip pin from being detached, to increase the capacity of the crane, and to perform the boom expansion / contraction operation easily and quickly. Can be provided.

It is the side view which showed roughly the whole mobile crane concerning one embodiment of the present invention. It is the schematic shown longitudinally in the state which contracted the telescopic boom in the above-mentioned mobile crane. It is the schematic which longitudinally cuts and shows a part of base end part vicinity in the state which said telescopic boom contracted. FIG. 3 is a perspective view schematically showing a cross-section of a part near the tip in a contracted state of the telescopic boom. It is a perspective view of the vicinity of the base end portion of the telescopic drive cylinder incorporated in the telescopic boom. It is the longitudinal cross-sectional view which carried out the cross section of a part of front-end | tip part vicinity in the state which the said extendable boom in which the cylinder for a grip pin drive and a 1st lock pin operation mechanism are integrated is retracted. FIG. 5 is a schematic view crossing the grip pin drive cylinder where the grip pin drive cylinder and the first lock pin operating mechanism are incorporated in a contracted state where the grip pin drive cylinder is located near the tip. FIG. 4 is a schematic view crossing the grip pin driving cylinder at a position near the base end in a contracted state of the telescopic boom incorporating the grip pin driving cylinder and the first lock pin operating mechanism. FIG. 3 is a schematic view crossing the grip pin driving cylinder in the contracted state of the telescopic boom incorporating the grip pin driving cylinder and the first lock pin operating mechanism in the vicinity of the base end portion. It is the schematic which crosses and shows the base end vicinity in the state which the said expansion-contraction boom in which the 2nd lock pin operation mechanism was incorporated was contracted. It is the schematic which crosses and shows the base end part vicinity part in the state which the said expansion-contraction type boom in which the 2nd lock pin operation mechanism was incorporated was contracted. It is explanatory drawing which showed schematically the hydraulic circuit of the said mobile crane. It is operation | movement explanatory drawing which shows the order of the expansion-contraction operation | movement of the said mobile crane. It is operation | movement explanatory drawing which shows the order of the expansion-contraction operation | movement of the said mobile crane. It is operation | movement explanatory drawing which shows the order of the expansion-contraction operation | movement of the said mobile crane. It is operation | movement explanatory drawing which shows the order of the other expansion-contraction operation | movement of the said mobile crane.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 schematically shows an entire mobile crane A such as a wheel crane. This mobile crane A is equipped with a swivel base 2 on a traveling vehicle body 1, and on this swivel base 2, a pivotal base for attaching a base end portion of a base boom 11 of a telescopic boom (mechanism) 10 to be described later. A landing portion 3 is provided. On the swivel base 2, a winding drum storage chamber 4 is disposed behind the pivoting portion 3. An auxiliary weight 5 is attached to the rear end of the swivel base 2. A driver's cab 6 is provided at a front portion of the vehicle body 1. Outriggers 7 are provided at the front part and the rear part of the vehicle body 1, respectively. The vehicle body 1 is provided with wheels 8. The swivel base 2 is equipped with a cylinder unit for raising and lowering the telescopic boom (unit) 10. This cylinder unit includes a cylinder tube 17 connected to the swivel base 2 and an extendable rod 18 connected to the extendable boom 10, and the tip of the extendable rod 18 is connected to the base boom 11 of the extendable boom 10 via a pin 19. It is connected.

  As shown in an enlarged view in FIG. 2, the telescopic boom 10 includes a base boom 11, four intermediate booms 12 to 15, and a top boom 16 in order from the outside in a stacked manner. It is configured to be telescopically stretchable by being inserted. Specifically, the intermediate booms 12 to 15 are sequentially fitted into the base boom 11 and the top boom 16 is fitted to the innermost side. Here, only the base boom 11 is a fixed boom that does not move to expand and contract, and the other boom members are boom members that expand and contract. A sheave bracket 26 is attached to the tip of the top boom 16. In this embodiment, an example of a six-stage boom member is shown, but the present invention is not limited to the number of stages of the boom member.

  As shown in FIG. 3, a connecting block 29 is provided at the base end of the base boom 11, and a connecting pin hole 30 is formed in the connecting block 29. A shaft pin (not shown) of the pivoting portion 3 of the swivel base 2 is fitted into the connection pin hole 30 to connect the base boom 11 to the swivel base 2 in a swingable manner.

  The intermediate booms 12 to 15 and the top boom 16 other than the above-described base boom 11 are extended or contracted by a single backward boom expansion / contraction drive cylinder unit 20 described later. The boom telescopic drive cylinder unit 20 includes a cylinder tube 21 and a piston rod 22, and is a hydraulic cylinder unit in which the cylinder tube 21 extends and contracts with respect to the piston rod 22. The boom telescopic drive cylinder unit 20 is disposed along the longitudinal direction of the telescopic boom 10 in a space 25 that is formed on the innermost side of the telescopic boom 10. The length of the cylinder tube 21 is a length that can reach from the proximal end position of the telescopic boom 10 to the vicinity of the distal end in a state where all the boom members contract to the top boom 16.

  A proximal end block 24 is fixedly attached to the proximal end of the cylinder tube 21. A through hole serving as a space 25 penetrating in the longitudinal direction of the cylinder tube 21 is formed in the center of the base end block 24. The piston rod 22 protrudes from the opening end of the space 25 through which the piston rod 22 protrudes (see FIGS. 2, 3 and 5). A hydraulic circuit pipe 35 is disposed on the upper surface of the cylinder tube 21.

  A connecting bracket 36 is attached to the tip of the piston rod 22. A connection pin hole 37 is formed in the connection bracket 36. A connecting pin 38 attached to the base portion of the base boom 11 is fitted into the connecting pin hole 37, whereby the piston rod 22 is pivotally attached to the base end portion of the base boom 11. In addition, you may make it connect the front-end | tip of the said piston rod 22 with respect to the said swivel 2 so that rocking | fluctuation is possible by utilizing another member.

  As shown in FIGS. 3 to 5, a guide roller 41 is provided at each of a lower portion of the base end of the cylinder tube 21 of the boom expansion / contraction drive cylinder unit 20 and a lower portion of the tip end of the cylinder tube 21. The guide roller 41 rolls on the inner bottom surface of the main body of the boom 10. As shown in FIGS. 3 to 5, guide side plates 43 are provided on the left and right inner walls of the cylinder tube 21 of the boom expansion / contraction drive cylinder unit 20.

  As shown in FIG. 4, a trunnion block 45 is provided near the tip of the cylinder tube 21. As shown in FIGS. 4, 7 and 8, the upper and lower walls at the left and right ends of the trunnion block 45 are formed as flat surfaces 47. The ends where the flat surfaces 47 are provided at the top and bottom are guided by a pair of upper and lower slide plates 48 disposed on the inner wall surface of the top boom 16 and a left and right depth guide member 49, and the position of the trunnion block 45 is regulated. . The guide members 48 and 49 provided at the rear end of the second-stage boom 12 have a function of preventing the boom expansion / contraction drive cylinder unit 20 from buckling when the third-stage boom 13 is extended.

  As shown in FIGS. 7 and 8, the trunnion block 45 has a pair of grip pins 51 as a grip member that can be protruded and retracted laterally from the left and right side walls, and the grip pins 51 are protruded and retracted. A pair of grip pin driving hydraulic cylinder units 52 is provided. The left and right grip pins 51 are driven to project and retract simultaneously by the respective grip pin driving hydraulic cylinder units 52. The left and right grip pins 51 are simultaneously projected and retracted from the side surface of the trunnion block 45 to engage or disengage from a grip pin receiving hole 55 described later to disengage any member of the booms 12 to 16. It is a mechanism to hold. The grip pin driving hydraulic cylinder unit 52 of the grip mechanism includes a piston including the grip pin 51 and a cylinder tube 56 in which the piston is movably fitted to the left and right sides. A compression coil spring 57 that biases in the protruding direction is provided. A hydraulic chamber 58 is formed between the cylinder tube 56 and the grip pin 51, and when pressure oil is supplied to the hydraulic chamber 58, the grip pin 51 moves backward against the biasing force of the coil spring 57. When the hydraulic pressure in the hydraulic chamber 58 is released, the piston 51 protrudes to the side by the urging force of the coil spring 57, and if the grip pin receiving hole 55 is located there, the piston 51 is fitted into the grip pin receiving hole 55. Match.

  An anti-rotation pin 59 is attached to the inner end portion of the grip pin 51. The anti-rotation pin 59 is fitted into a slit-shaped guide groove 60 formed in the member of the trunnion block 45 and slides to grip. Restricting means for moving the pin 51 without rotating it is configured. The rotation stop pin 59 also serves as an operator for operating a limit switch (not shown) disposed below the trunnion block 45. The grip pin 51 is provided with a valve operator 131 for an interlock mechanism described later (see FIG. 12). This valve operator is constructed using the rotation stop pin 59 or other members.

  As shown in FIG. 8, grip pin receiving holes 55 for inserting grip pins 51 protruding from the side surfaces of the trunnion block 45 are formed in members of the booms 12 to 16 other than the base boom 11. However, although the members of the intermediate booms 12 to 16 are formed on the respective wall members of the base end side portions, the members of the top boom 16 include not only the base end side portions but also the tip end side portions thereof. It is also formed on the wall member. FIG. 7 shows a relationship regarding the grip pin receiving hole 55 of the top boom 16.

  7 and 8, when the grip pin receiving hole 55 of each boom 12-16 and the position of the grip pin 51 coincide with each other, when the grip pin 51 is protruded, the grip pin 51 corresponds. It is inserted into the grip pin receiving hole 55 to hold the members of the booms 12 to 16 having the grip pin receiving hole 55.

  Moreover, as shown in FIG. 1, the inner end position of each of the telescopic booms 13 to 16 is closer to the base end side than the base end of the nearest outer telescopic boom, as is apparent when the telescopic booms 12 to 16 are contracted. Sequentially displaced. The grip pin receiving holes 55 are also arranged at a predetermined interval. As a result, the grip pin receiving holes 55 of the telescopic booms 12 to 14 positioned inside and outside are arranged without overlapping each other, and each grip pin receiving hole 55 is exposed and positioned in the space where the trunnion block 45 is arranged. .

  The tip of the piston rod 22 of the boom extension / contraction drive cylinder unit 20 is connected to the base of the base boom 11. When the cylinder unit 20 is driven to extend and contract, the piston rod 22 itself does not move in the axial direction, and only the cylinder tube 21 moves. As the cylinder tube 21 moves, the trunnion block 45 moves, and the grip pin 51 moves accordingly. And the grip pin 51 can be moved to the position which can be inserted in the grip pin receiving hole 55 of each boom 12-16. When the grip pin 51 is inserted into the grip pin receiving hole 55, the grip pin 21 is engaged with the grip pin receiving hole 55, and members of the booms 12 to 16 having the grip pin receiving hole 55 are connected to the trunnion block 45. It moves with the movement of the cylinder tube 21. Thus, the members of the booms 12 to 16 held by the grip pins 21 can be moved. By this grip mechanism, it is possible to select specific booms 12 to 16, connect them to the cylinder tube 21, and move only the connected specific booms 12 to 16 in the telescopic direction.

  On the other hand, as shown in FIGS. 2, 3, 6 to 7 and FIGS. 9 to 10, a lock pin 61 as a lock member is provided at the base end of the other booms 12 to 16 except the base boom 11. A lock pin guide mechanism 62 for holding the lock pin 61 so as to protrude and retract is provided. The lock pin 61 is slidably fitted and held in a guide hole 64 formed in a cylindrical member 63 provided in a wall member at the base end portion of the booms 12 to 16. The guide hole 64 is formed along a direction orthogonal to the direction in which the booms 12 to 16 extend and contract, and has a function of guiding the lock pin 61 in a direction orthogonal to the boom expansion / contraction direction.

  A connecting rod 65 is connected to the inner end of the lock pin 61. The connecting rod 65 passes through a cover 66 attached to the inner opening end of the tubular member 63 and protrudes inward of the boom member. A hanger 67 is attached to the inward protruding tip of the connecting rod 65. The hanger 67 moves in the guide direction by the guide hole 64 together with the lock pin 61 through the connecting rod 65.

  In the tubular member 63, a spring 68 is provided between the lock pin 61 and the cover 66 as a means for urging the lock pin 61 outward. The lock pin 61 is urged outward by the elastic force of the spring 68. The lock pin 61 is urged in a direction protruding from the cylindrical member 63. As shown in FIG. 9, the outer end of the lock pin 61 is fitted into a lock hole 76 serving as a latch receiving portion (described later) of the booms 11 to 15 located adjacent to the outer side of the lock pin 61, and is engaged with the lock hole 76. It becomes the latching | locking part 69 which stops.

  The lock pin guide mechanism 62 incorporates a lock pin rotation stop mechanism (not shown) for restricting the rotation of the lock pin 61. This lock pin anti-rotation mechanism can be incorporated into the tubular member 63, the cover 66 or the hanger 67.

  As shown in FIGS. 3 and 4, the base end portion of the lock hole 76 that receives the load of the boom is formed with a flat portion 77, and the load at the locking portion 69 of the lock pin 61 that engages with the lock hole 76. The receiving portion is also formed on the flat portion 78. For this reason, since the flat part 77 of the lock hole 76 and the flat part 78 on the lock pin 61 side are in contact with each other, that is, engage with each other by surface contact, The lock hole 76 can increase the connection strength, and can connect adjacent booms in a state where the connection state between the lock pin 61 and the lock hole 76 is stable. The lock hole 76 may be formed directly on the frame walls of the booms 11 to 15. However, in this embodiment, as shown in FIGS. 3 and 4, another receiving member 79 having the lock hole 76 is provided. The engaging portion is reinforced as a structure to be attached to the frame wall.

  The lock holes 76 are respectively formed in the base end side portions, the tip end side portions, and the midway wall portions of the booms 11 to 15 other than the top boom 16. When the locking portion 69 of the lock pin 61 opposes the lock hole 76, the lock pin 61 is fitted into and locked with the lock hole 76, and the boom provided with the lock pin 61 is connected to the outer boom. For example, a pair of inner and outer booms 11 and 12, a pair of booms 12 and 13, a pair of booms 13 and 14, a pair of booms 14 and 15, or a pair of booms 15 and 16 can be connected respectively. (Boom coupling means). When each of the booms 12 to 16 is extended and the lock pin 61 moves to the target lock hole 76, the engaging portion 69 of the lock pin 61 is fitted into the lock hole 76. A pair of adjacent inner and outer booms 11 to 16 that are locked and extended are connected to each other. In addition, the lock hole 76 is formed not only in the base end portion and the distal end portion of the boom member but also in the intermediate portion of the boom member. For this reason, it is possible to select a case where the length of the boom to be extended can be shortened by locking the lock pin 61 in the lock hole 76 in the intermediate portion.

  As shown in FIG. 8, a stopper 70 that contacts the cover 66 is formed on the inner end of the connecting rod 65 with a large diameter, and a locking portion 69 of the lock pin 61 is fitted into a predetermined position of the lock hole 76. Stopper mechanism to stop. Even if the lock pin 61 is urged outwardly by the spring 68 or a lock pin engagement / disengagement operation mechanism described later, the stopper 70 does not protrude beyond the position where it comes into contact with the cover 66.

  As shown in FIG. 8, the hanger 67 has a claw-like hook 71 formed so that a flange head 80 as an engaging portion that is lifted and lowered by a lock pin engaging / disengaging operation mechanism, which will be described later, is inserted from the boom expansion / contraction direction. Is provided.

  As shown in FIGS. 8 and 9, the trunnion block 45 is provided with a first lock pin engaging / disengaging operation mechanism 81 for operating the lock pins 61 incorporated in the booms 12 to 16. . The lock pin engagement / disengagement operation mechanism 81 includes a cylinder tube 82 disposed in a direction orthogonal to the direction in which the booms 12 to 16 extend and contract, and a lock pin driving cylinder 84 having a piston 83 inserted into the cylinder tube 82. Is provided. The flange head 80 is attached to the upper end of the rod of the piston 83.

  The cylinder tube 82 is fixed to the trunnion block 45. A hydraulic chamber 85 is formed between the cylinder tube 82 and the piston 83. When pressure oil is applied to the hydraulic chamber 85, the piston 83 moves downward. A compression coil spring 86 that urges the piston 83 toward the lock pin 61 is accommodated in the cylinder tube 82. Since the piston 83 is urged by the compression coil spring 86, in a free state where no hydraulic oil is applied to the hydraulic chamber 85, as shown in FIGS. 8 and 9, the piston 83 rises to a certain height and rises against the stopper 87. Wait at the end position. When pressure oil is supplied to the hydraulic chamber 85, the piston 83 is lowered by the hydraulic pressure against the urging force of the compression coil spring 86. When the pressure oil in the hydraulic chamber 85 is released, the piston 83 is raised by the urging force of the compression coil spring 86 and returns to the original position.

  A hanger locking frame 91 is attached to the upper end of the piston 83. A flange head 80 having a shape that can be locked to the hanger 67 is formed by extending the end of the hanger locking frame 91 to the left and right. As shown in FIG. 8, when the piston 83 is in the standby position, the flange head 80 is inserted into the claw-like hook 71 of the hanger 67. In this standby state, the driving cylinder unit 20 is driven and the trunnion block 45 is moved, whereby the flange head 80 is engaged with the hook 71 of the hanger 67 as shown in FIG.

  As shown in FIGS. 10 and 11, the base block 24 disposed in the vicinity of the base end of the cylinder tube 21 in the boom boom telescopic drive cylinder unit 20 has a lock incorporated in the intermediate boom 12 in the first stage. A second lock pin engaging / disengaging mechanism 92 for operating the pin 61 is provided. The second lock pin engagement / disengagement operation mechanism 92 includes a lock pin drive cylinder 95 and an operation link mechanism 96 operated by the lock pin drive cylinder 95. The operation link mechanism 96 includes a substantially crank-shaped undulation lever 97, and an intermediate portion of the undulation lever 97 is pivotally attached to a support piece 99 fixed to the proximal block 24 by a shaft pin 98. The working end side arm portion of the hoisting lever 97 extends rearward in a direction inclined obliquely upward, and the tip of the working end side arm portion is placed in the hook 71 of the hanger 67 for the first stage intermediate boom 12. A roller 101 as a locking portion to be inserted is attached.

  The arm portion 102 on the other end side of the hoisting lever 97 hangs downward from the pivot position by the shaft pin 98. The tip of the rod 109 extending from the piston 108 of the lock pin drive cylinder 95 is connected to the tip of the other end side arm portion 102. The cylinder tube 111 of the lock pin drive cylinder 95 is arranged in a direction parallel to the direction in which the boom expands and contracts. For this reason, the piston 108 advances and retreats in the direction in which the boom expands and contracts.

  In the lock pin drive cylinder 95, a hydraulic chamber 112 is formed between the cylinder tube 111 and the piston 108 as in the first lock pin engagement / disengagement operation mechanism 81 described above. A compression coil spring 113 that urges the piston 108 rearward is accommodated in the cylinder tube 111. The compression coil spring 113 urges the piston 108 toward the rear side of the telescopic boom 10. In a free state where pressure oil is not applied to the hydraulic chamber 112, the piston 108 is moved rearward by the urging force of the compression coil spring 113, and the hoisting lever 97 is raised, as shown in FIGS. The roller 101 is raised to a position where the first intermediate boom 12 is inserted into the hook 71 of the hanger 67. And when it reaches the rising end position, it is regulated by a stopper formed on the cylinder tube 111 or the like and stands by at that position. Further, when pressure oil is supplied to the hydraulic chamber 112, the pressure oil moves the piston 108 forward against the urging force of the compression coil spring 113 and rotates the undulation lever 97 in a direction to lie down. 67 is lowered and the lock pin 61 is pulled out of the lock hole 76.

  Further, when the pressure oil in the hydraulic chamber 112 is released, the roller 101 returns to the original standby position by the urging force of the compression coil spring 113. Then, the roller 101 returns to the standby position where it can be inserted into the claw-like hook 71 of the hanger 67.

  Next, the interlock mechanism of the lock pin 61 will be described. First, an interlock mechanism for the first lock pin engagement / disengagement operation mechanism 81 will be described.

  As shown in FIGS. 7 to 8, the trunnion block 45 is provided with a pair of left and right interlock pins 121 positioned on the left and right of the first lock pin engagement / disengagement operation mechanism 81. The interlock pin 121 is inserted into a guide tube 122 fixed to the trunnion block 45 and can move in the axial direction of the cylinder tube 82 of the drive cylinder 84. A flange 125 is formed in the middle of the interlock pin 121 located in the guide tube 122. A stopper 126 is formed at the upper end of the guide tube 122. The interlock pin 121 can be raised to a position where the flange 125 hits the stopper 126. A compression coil spring 127 for biasing the first interlock pin 121 toward the hanger 67 is provided in the guide tube 122. Normally, as shown in FIG. 7, the first interlock pin 121 is in a position lifted by the urging force of the compression coil spring 127, and the rod 125 hits the stopper 126 and stands by. As will be described later, the first interlock pin 121 is pushed against the urging force of the compression coil spring 127 by the hanger 67, so that the lower end portion thereof is fitted into the member of the trunnion block 45, and the trunnion block 45 It is possible to project into the chamber 129 formed inside.

  As shown in FIG. 7, a second interlock pin 128 is fixedly attached to the inner end of the grip pin 51 of the grip mechanism. The second interlock pin 128 is disposed in a chamber 129 in which the lower end portion of the first interlock pin 121 projects and is moved together with the grip pin 51 to be the lower end portion of the first interlock pin 121. It is possible to advance and retreat to the area where the sunk and projecting (intersection area). Since the second interlock pin 128 is movable together with the grip pin 51, the second interlock pin 128 is retracted from below the first interlock pin 121 when the grip pin 51 protrudes as shown in FIG. 7. As shown in FIG. 9, when the grip pin 51 is retracted, the second interlock pin 128 enters an area (intersection area) located below the first interlock pin 121, and the first interlock pin The lower end of the lock pin 121 comes into contact with the second interlock pin 128 to prevent the first interlock pin 121 from being lowered.

  According to this interlock mechanism, when the lock pin 61 is inserted into and removed from the lock holes 76 of the booms 12 to 15, the hanger 67 connected to the lock pin 61 is in a position where it hits the first interlock pin 121. For this reason, when the lock pin 61 is pulled out, the lower surface of the hanger 67 hits the upper end of the first interlock pin 121, and the hanger 67 and the first interlock pin 121 move up and down.

  However, when the grip pin 51 is in the released state, the second interlock pin 128 is located below the first interlock pin 121, so that the first interlock pin 121 remains in the raised position and descends. I can't. That is, the lock pin 61 engages with the lock hole 76 and maintains the locked state.

  On the other hand, as shown in FIG. 8, when the grip pin 51 moves forward and engages with the grip pin receiving hole 55, the second interlock pin 128 is disengaged from the lower region of the first interlock pin 121. For this reason, the first interlock pin 121 can be lowered. The lock pin 61 can be removed from the lock hole 76. Therefore, the lock pin 61 and the grip pin 51 exhibit an interlock function that does not come out of the state.

  Next, the interlock mechanism of the second lock pin engagement / disengagement operation mechanism 92 will be described. As shown in FIG. 12, each grip pin 51 in the grip pin driving hydraulic cylinder unit 52 is provided with an interlock mechanism valve operator 131, and two first mechanisms are provided by these interlock mechanism valve operators 131. Each mechanical shut-off valve 132 is operated. Pressure oil is supplied to or shut off from the lock pin drive cylinder 95 in the second lock pin engagement / disengagement operating mechanism 92 via two first mechanical shut-off valves 132 in series. Each of the first mechanical shut-off valves 132 has an open position and a closed position, and is connected in series to the fuel supply source 140. The first mechanical shut-off valve 132 is in the open position when the grip pin 51 protrudes and is in the closed position when the grip pin 51 is retracted.

  In addition, as shown in FIG. 12, the hydraulic chambers 58 of the two grip pin driving hydraulic cylinder units 52 of the grip mechanism are in parallel to the oil supply source 140 via a second mechanical shutoff valve 133 as an interlock valve. It is connected. That is, two grip pin driving hydraulic cylinder units 52 are connected in parallel to the second mechanical shutoff valve 133. The second mechanical shut-off valve 133 has an open position and a closed position, and is connected in series to the oil supply source 140.

  Only when each grip pin 51 is in a protruding state, pressure oil is supplied to the hydraulic chamber 112 of the lock pin drive cylinder 95 in the second lock pin engagement / disengagement operation mechanism 92, and the second lock The lock engaging / disengaging operation by the pin engaging / disengaging operation mechanism 92 is possible.

  Further, the second mechanical shut-off valve 133 is operated by the movement of the raising / lowering lever 97 of the second lock pin engaging / disengaging operation mechanism 92, and becomes the open position when the raising / lowering lever 97 is raised. The hydraulic cylinder unit 52 is supplied with oil. When the raising / lowering lever 97 falls, the second mechanical shut-off valve 133 is in the closed position, and the oil supply to the hydraulic chambers 58 of the two grip pin driving hydraulic cylinder units 52 is shut off.

  Accordingly, the two mechanical shut-off valves 132 and 133 ensure an interlock function that prevents both the lock pin 61 and the grip pin 51 from being released together.

  As shown in FIG. 12, the switching cylinders 155, 156 are provided in the drive cylinders of the above-described grip pin driving hydraulic cylinder unit 52, the lock pin engaging / disengaging operation mechanism 81 and the second lock pin engaging / disengaging operation mechanism 92, respectively. The oil supply source 140 is connected via a hydraulic control circuit 141 having 157. The switching valves 155 and 156 make sure that the grip pin 51 and the lock pin 61 are inserted / removed by switching between oil supply and oil discharge to the drive hydraulic cylinder unit. The drive cylinder unit 20 is connected to an oil supply source 138 through a control drive circuit 137.

  Next, the operation | movement which expands / contracts this multistage expansion-contraction boom 10 is demonstrated. For example, it operates in the order of steps (0) to (15) shown in FIGS. Here, the state where the grip pin 51 and the lock pin 61 are engaged and engaged with the corresponding lock hole 76 or the grip pin receiving hole 55 is indicated by blacking or hatching, and is not engaged or released. The state of is displayed in white.

  First, in the boom form of the shortest reduction shown in (0) of FIG. 13A, all the booms 12 to 16 including the moving boom are in a stored state in which they are stored in the base boom 11. At this time, all the lock pins 61 are fitted into the lock holes 76 on the most proximal end side of the adjacent booms 11 to 15, and the booms 12 to 16 are in a locked state (see FIG. 3). Further, the grip pin 51 is fitted into and engaged with the grip pin receiving hole 55 on the distal end side of the top boom 16 (see FIG. 7).

  When the telescopic boom 10 in the retracted state is extended, first, the base boom 11 is left, and the booms 12 to 16 inside the base boom 11 are extended together. For this reason, the first-stage intermediate boom 12 fitted in the lock hole 76 of the base boom 11, that is, the lock pin 61 in the second-stage boom 12 is pulled out and released (step (1)).

  Then, the cylinder tube 21 is advanced by driving the piston rod 22 of the boom expansion / contraction drive cylinder unit 20 to extend. Thereby, the base boom 11 is left and the booms 12-16 move forward together (step (2)).

  At this final stage, when the lock pin 61 in the intermediate boom 12 of the first stage coincides with the lock hole 76 on the distal end side of the base boom 11, the lock pin 61 falls into the lock hole 76 and is inserted and locked. The boom 11 and the first stage intermediate boom 12 are automatically locked (step (3)).

  Thereafter, the grip pin 51 is pulled out from the grip pin receiving hole 55 of the top boom 16, and the engagement by the grip pin 51 is released (step (4)).

  Next, the boom expansion / contraction drive cylinder unit 20 is reduced, and the grip pin 51 is aligned with the grip pin receiving hole 55 on the base end side of the top boom 16 (step (5)).

  Then, the grip pin 51 is inserted into the grip pin receiving hole 55 on the base end side of the top boom 16 and automatically engaged (step (6)).

  Next, the lock pin 61 of the top boom 16 is pulled out, and the engagement with the intermediate boom 15 at the last stage is released (step (7)).

  Then, by extending the boom extension / contraction drive cylinder unit 20, the cylinder tube 21 is moved forward and moved forward together with the top boom 16 (step (8)). At the final stage of this step (8), the lock pin 61 of the top boom 16 coincides with the lock hole 76 of the intermediate boom 15 at the last stage and falls into the lock hole 76 to be inserted and locked. 15 and the top boom 16 are automatically locked (step (9)).

  Thereafter, the grip pin 51 of the top boom 16 is pulled out from the grip pin receiving hole 55 of the intermediate boom 15 at the last stage, and the engagement by the grip pin 51 is released (step (10)).

  Next, when the boom expansion / contraction drive cylinder unit 20 is reduced and the grip pin 51 is aligned with the grip pin receiving hole 55 on the base end side of the next boom 15 (step (11)), the base end side of the boom 15 is reached. The grip pin 51 is inserted into the grip pin receiving hole 55 and automatically engaged (step (12)).

  Then, the lock pin 61 of the intermediate boom 15 is pulled out, and the engagement with the next intermediate boom 14 is released (step (13)).

  Next, by extending the boom telescopic drive cylinder unit 20, the cylinder tube 21 is moved forward and moved forward together with the intermediate boom 15 (step (14)). At this final stage, when the lock pin 61 of the intermediate boom 15 coincides with the lock hole 76 of the intermediate boom 14 at the next stage, the lock pin 61 falls into the lock hole 76 and is inserted and locked. The boom 16 is automatically locked (step (15)).

  Thereafter, the intermediate booms 13 and 12 are similarly extended in this order. Further, when storing the extended multistage telescopic boom, it can be stored in the storage state by performing the reverse operation of the above operation.

  Further, if the lock pin 61 is engaged with the lock hole 76 installed at the intermediate position of the booms 11 to 15, the lock pin 61 can be extended at a small rate by the same procedure as described above (step (1) shown in FIG. 14). (See (5)).

  In the present embodiment, the engagement / disengagement device for releasing the lock state of the base boom 11 and the second stage boom 12 by the lock pin 61 is installed at the base end portion of the tube 21 of the boom telescopic drive cylinder unit. However, you may make it install in the direction of the member of the said base boom 11. FIG. Further, although an example in which a hydraulic cylinder unit is used, a pneumatic drive type may be used as appropriate. Furthermore, the positional relationship in which each device is installed vertically and horizontally is not limited thereto. And this invention is not limited to the thing of embodiment mentioned above, It is applicable to another form.

Further, according to the above description, the following matters are obtained.
The present invention relates to a boom boom telescopic device that extends and retracts a multistage telescopic boom using a cylinder unit, a base boom supported at a base by a base, and a plurality of base booms and a plurality of movably mounted base booms. A multistage telescopic boom having a boom, a boom having one end connected to the base end side portion of the base boom, the other end facing the front end side of the base boom, and the other end side portion extending and contracting A telescopic drive cylinder unit, a grip member that is provided at the distal end portion of the boom telescopic drive cylinder unit, holds and moves the movable boom, and is mounted on the boom and formed on another boom. A lock member that can be attached to and detached from the lock engaging portion and a boom extension / contraction drive cylinder unit are provided at the distal end portion of the boom expansion / contraction drive unit, and the third and subsequent booms are connected to each other. Comprises first engaging and detachment device for releasing the locked state by the lock member, the base boom and a second-stage boom, and a second engaging and disengaging device for releasing the locked state by the lock member.

  Further, another invention is provided at a tip side portion of the boom expansion / contraction drive cylinder unit, and when the lock member is released by the first engagement / disengagement device, the release of the grip member is prevented, and the grip member is When released, the first engagement / disengagement device includes an interlock member that prevents the lock member from being released, and an interlock mechanism that does not release the lock member and the grip member at the same time.

  According to another aspect of the invention, a first interlock member that is moved by the lock member when the lock member is released, and a second interlock that is moved by the grip member when the grip member is released. A movement region of the first interlock member and a movement region of the second interlock member intersect, and the intersection region has one of the first interlock member and the second interlock member. Provided with an interlock mechanism in which only the first interlock member and the second interlock member interfere with each other and are prevented from entering the intersecting region at the same time, and the lock member and the grip member are not released simultaneously. .

DESCRIPTION OF SYMBOLS 10 ... Multi-stage telescopic boom 11-16 ... Plural booms 20 ... Boom telescopic drive cylinder unit 51 ... Grip member 61 ... Lock member 92 ... 2nd engagement / disengagement device

Claims (4)

In the boom telescopic device of a crane that expands and contracts a multistage telescopic boom using a cylinder unit,
A base boom whose base end is supported by a base, a multi-stage telescopic boom having a plurality of movable booms mounted on the base boom and the base boom;
One end is connected to the base end side part of the base boom, the other end is arranged in the multistage telescopic boom with the other end facing the base boom, and the other end of the multistage telescopic boom is extended and contracted. A boom expansion / contraction drive cylinder unit,
A trunnion block provided on the expansion / contraction side portion of the boom expansion / contraction drive cylinder unit;
A grip member provided on the trunnion block, which can protrude and retract from a side wall of the trunnion block;
A piston and a cylinder are arranged in the trunnion block, and the piston is formed integrally with the grip member. The piston projects the grip member from the trunnion block side by the piston and protrudes from the trunnion block side wall. The movable boom can be driven to both the position where the movable boom is held, and the movable boom can be moved by the expansion / contraction of the boom telescopic drive cylinder unit with the movable boom held by the grip member. A gripping member driving cylinder unit,
At least one base boom is provided, and a plurality of lock engaging portions provided apart from each other in a direction in which the moving boom extends and contracts, except for the top boom.
The lock engagement portion can be engaged with the lock engagement portion when the lock engagement portion is fitted to the movement boom and matches the position of a lock engagement portion formed on an adjacent boom located outside the movement boom. A locking member that can be detached from the state engaged with
An engagement / disengagement operation device that is provided on the trunnion block and that can operate the lock member from a position where the lock member connects the booms to a position where the connection state is released;
The trunnion block is moved in a first direction that is the same as the movement direction of the lock member that is moved by the engagement / disengagement operation device, and follows the lock member when the lock state by the lock member is released. A first interlocking member that is moved and has one end side portion moved into the trunnion block;
A second interlock member provided in the trunnion block and moved by the grip member driving cylinder unit in the trunnion block in the same second direction as the movement direction of the grip member;
The region where the one end side portion of the first interlock member moves within the trunnion block intersects the region where the second interlock member portion moving within the trunnion block moves, and this intersection region Thus, the first interlock member and the second interlock member interfere with each other to prevent the first interlock member and the second interlock member from entering the region at the same time. Only one of the interlock member and the second interlock member can be located in the intersecting region in the trunnion block, and the boom holding by the grip member and the boom connection by the lock member can be performed simultaneously. An interlock mechanism that does not release,
A boom boom telescopic device comprising: The engagement / disengagement operation device includes a lock member drive cylinder unit that moves up and down an engagement portion head that can be engaged with and disengaged from a hanger provided on the lock member.
The crane boom according to claim 1, wherein a cylinder mounting position of the lock member driving cylinder unit and a cylinder mounting position of the grip member driving cylinder unit coincide with each other in a telescopic direction of the boom expansion / contraction driving cylinder unit. Telescopic device.   When the lock member driving cylinder unit is moved from the raised position where the lock member is locked to the lock engagement portion to the release position where the lock member is pulled out from the lock engagement portion, the hanger hits the first interlock member. The crane boom extender according to claim 2, wherein the first interlock member is moved. The second interlock member is attached in a state of being fixed to a piston member of the grip cylinder operating drive cylinder unit, and moves together in the trunnion block. The boom expansion-contraction apparatus of the crane of Claim 3.

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