Auxiliary Cylinder

Abstract

To provide an auxiliary cylinder capable of suppressing load oscillation when a crawler or the like is lifted.SOLUTION: An auxiliary cylinder comprises: a link 2 connected at one end to a mast 15 of a crane 10 so as to freely oscillate; a hydraulic cylinder 3 connected at one end to the other end of the link 2; a bracket 4 connected to the other end of the hydraulic cylinder 3; and a stopper 5 that is fitted to one end of the link 2 and that regulates the oscillation angle of the link 2 with respect to the mast 15. The other end of the link 2 and one end of the hydraulic cylinder 3 are connected with a plurality of first pins, and the other end of the hydraulic cylinder 3 and the bracket 4 are connected with a plurality of second pins.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an auxiliary cylinder that is pivotally mounted on a hoisting member of a work machine. [Background technology]

[0002] In a work machine such as a crane, disassembly and assembly are performed at the work site. As disclosed in Patent Document 1, a crane is known in which an auxiliary cylinder that assists in attaching and detaching crawlers and disassembling and assembling a boom is swingably mounted on a mast, which is a raising and lowering member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-178562 A Summary of the Invention [Problem to be solved by the invention]

[0004] The auxiliary cylinder is composed of a link, a hydraulic cylinder, and a bracket, with one end of the link connected to the hoisting member by a pin, the other end of the link connected to one end of the hydraulic cylinder by a pin, and the other end of the hydraulic cylinder connected to the bracket by a pin. Therefore, the link has a high degree of freedom to swing relative to the hoisting member, the hydraulic cylinder has a high degree of freedom to swing relative to the link, and the bracket has a high degree of freedom to swing relative to the hydraulic cylinder. Therefore, when a crawler or the like is lifted by the auxiliary cylinder, there is a high possibility that the load will shake.

[0005] An object of the present invention is to provide an auxiliary cylinder capable of suppressing the shaking of a load when lifting a crawler or the like. [Means for solving the problem]

[0006] The present invention comprises a link having one end connected to a hoisting member of a work machine so as to be able to swing freely, a hydraulic cylinder having one end connected to the other end of the link, a bracket connected to the other end of the hydraulic cylinder, and a regulating member attached to the one end of the link and regulating the swing angle of the link relative to the hoisting member, wherein the other end of the link and the one end of the hydraulic cylinder are connected by a plurality of first pins, and the other end of the hydraulic cylinder and the bracket are connected by a plurality of second pins. Effect of the Invention

[0007] According to the present invention, the swing angle of the link relative to the hoisting member is restricted by the restricting member. This makes it possible to restrict the degree of freedom of swing of the link relative to the hoisting member. Furthermore, the other end of the link and one end of the hydraulic cylinder are connected by a plurality of first pins, and the other end of the hydraulic cylinder and the bracket are connected by a plurality of second pins. This makes it possible to reduce the degree of freedom of swing of the hydraulic cylinder relative to the link and the degree of freedom of swing of the bracket relative to the hydraulic cylinder, compared to when the other end of the link and one end of the hydraulic cylinder are connected by one pin and the other end of the hydraulic cylinder and the bracket are connected by one pin. This makes it possible to suppress load shaking when the crawler or the like is lifted by the auxiliary cylinder. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a side view of the crane, showing the crane in an assembled state. [Diagram 2] FIG. 2 is a side view of an exploded crane showing the crawler being raised by an auxiliary cylinder. [Diagram 3] FIG. 3 is an enlarged view of a main part A in FIG. [Figure 4] FIG. 3 is an enlarged view of a main part B in FIG. [Diagram 5] FIG. 3 is an enlarged view of a main part C in FIG. [Figure 6]FIG. 2 is a side view of the disassembled crane showing the auxiliary cylinder retracted into the mast. [Figure 7] FIG. 7 is an enlarged view of a main part D in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[0010] (Crane configuration) The auxiliary cylinder in this embodiment is provided to be able to swing on the hoisting member of the work machine. As shown in Fig. 1, which is a side view of a crane 10 which is a work machine, the crane 10 is adapted to hoist and lower a load (not shown) and is configured with an upper rotating body 12 rotatably provided on the upper part of a crawler-type lower traveling body 11. The work machine is not limited to a crawler-type crane, and may be a wheel-type crane.

[0011] The upper rotating body 12 includes a rotating frame 13, a boom 14, a mast 15, a winch 16, a lower spreader 17, a counterweight 18, and a backstop device 19.

[0012] The rotating frame 13 is attached to the lower running structure 11 via a rotating bearing (not shown). The boom 14 is connected to the front part of the rotating frame 13 so as to be able to rise and fall relative to the rotating frame 13. The boom 14 is made up of a lower boom, one or more intermediate booms, and an upper boom. In this embodiment, the boom 14 is a lattice boom.

[0013] A mast (hoisting member) 15 is connected to the revolving frame 13 on the rear side of the boom 14 so as to be capable of being raised and lowered. A tip of the mast 15 and a tip of the boom 14 are connected via a guy link 20.

[0014] The winch 16 is disposed in the center of the revolving frame 13. The winch 16 winds and unwinds the wire rope, and is used for hoisting and lowering a load and for raising and lowering the boom 14. In this embodiment, three winches 16 are provided. The three winches 16 are disposed from the front to the rear of the revolving frame 13 in this order: main hoisting winch 16a, auxiliary hoisting winch 16b, and hoisting winch 16c.

[0015] The lower spreader 17 is provided at the rear of the revolving frame 13. The upper spreader 21 provided at the tip of the mast 15 and the lower spreader 17 are connected via a boom hoisting rope 22. By winding and unwinding the boom hoisting rope 22 with the winch 16, the mast 15 is raised and lowered, and as a result, the boom 14 is raised and lowered.

[0016] The counterweight 18 is mounted on the rear of the revolving frame 13. The backstop device 19 is attached to the rear of the boom 14 and extends from the rear of the boom 14 toward the revolving frame 13. The backstop device 19 is received by a backstop receiver 23 fixed to the revolving frame 13, thereby restricting the rearward rotation of the boom 14.

[0017] The crane 10 thus configured is disassembled and assembled at the work site. The crane 10 is disassembled into a plurality of parts, loaded onto a plurality of trailers or the like, transported to the next work site, and reassembled at the work site.

[0018] 2, which is a side view of the disassembled crane 10, when disassembling the crane 10, the boom 14 is disassembled and removed from the upper rotating body 12. In addition, the counterweight 18 is removed from the upper rotating body 12, and the crawlers are removed from the lower traveling body 11.

[0019] (Configuration of auxiliary cylinder) As shown in Fig. 2, the crane 10 has an auxiliary cylinder 1. The auxiliary cylinder 1 is provided to be able to swing freely on the mast 15. The auxiliary cylinder 1 is provided on the ventral side (the right side in the figure) of the mast 15. The swing direction of the auxiliary cylinder 1 is the left-right direction in Fig. 2. The auxiliary cylinder 1 may also be provided to be able to swing freely on the boom 14 (lower boom).

[0020] The auxiliary cylinder 1 is used to attach and detach the boom 14 and crawler by itself when assembling and disassembling the crane 10. As shown in Fig. 2, assembly and disassembly work using the auxiliary cylinder 1 is performed with the mast 15 tilted and the auxiliary cylinder 1 in a vertical position. Fig. 2 shows a state in which the auxiliary cylinder 1 is lifting the crawler 11a. The auxiliary cylinder 1 can also be used to lift the lower boom.

[0021] The auxiliary cylinder 1 has a link 2, a hydraulic cylinder 3, and a bracket 4. One end of the link 2 is connected to the tip of the mast 15 by a single pin so as to be able to swing freely. One end of the hydraulic cylinder 3 is connected to the other end of the link 2. The bracket 4 is connected to the other end of the hydraulic cylinder 3 (the tip of the rod).

[0022] As shown in FIG. 3, which is an enlarged view of a main part A in FIG. 2, the auxiliary cylinder 1 has a stopper 5. The stopper (regulating member) 5 is attached to one end of the link 2. The stopper 5 has a pair of claw members 5a spaced apart in the swing direction of the link 2 relative to the mast 15. When the link 2 swings relative to the mast 15, one of the pair of claw members 5a comes into contact with the mast 15. This restricts the swing angle of the link 2 relative to the mast 15. Here, the distance between the pair of claw members 5a is preferably set so that the link 2 can swing between a stored position of the auxiliary cylinder 1 and a position where the auxiliary cylinder 1 performs the task of lifting the crawler 11a and the lower boom.

[0023] 2, the other end of the link 2 and one end of the hydraulic cylinder 3 are connected by a plurality of first pins 6. In this embodiment, the number of first pins 6 is two, but it may be three or more. The two first pins 6 are arranged side by side in the longitudinal direction of the hydraulic cylinder 3, but they may be arranged side by side in a direction perpendicular to the longitudinal direction of the hydraulic cylinder 3.

[0024] 2, the other end of the hydraulic cylinder 3 (the tip of the rod 3a) and the bracket 4 are connected by a plurality of second pins 7. In this embodiment, the number of second pins 7 is two, but it may be three or more. The two second pins 7 are arranged side by side in the longitudinal direction of the hydraulic cylinder 3, but they may be arranged side by side in a direction perpendicular to the longitudinal direction of the hydraulic cylinder 3.

[0025] As described above, the swing angle of the link 2 relative to the mast 15 is restricted by the stopper 5. Therefore, the degree of freedom of swing of the link 2 relative to the mast 15 can be limited. In addition, the other end of the link 2 and one end of the hydraulic cylinder 3 are connected by a plurality of first pins 6, and the other end of the hydraulic cylinder 3 and the bracket 4 are connected by a plurality of second pins 7. As a result, the degree of freedom of swing of the hydraulic cylinder 3 relative to the link 2 and the degree of freedom of swing of the bracket 4 relative to the hydraulic cylinder 3 can be lowered compared to a case in which the other end of the link 2 and one end of the hydraulic cylinder 3 are connected by one pin and the other end of the hydraulic cylinder 3 and the bracket 4 are connected by one pin. As a result, it is possible to suppress load shaking when the crawler 11a or the like is lifted by the auxiliary cylinder 1.

[0026] As shown in Fig. 6, which is a side view of the disassembled crane 10, when the auxiliary cylinder 1 is stored in the mast 15, the mast 15 is inclined with its ventral surface facing up. In this state, the auxiliary cylinder 1 is placed on the ventral surface of the mast 15.

[0027] Here, the mast 15 has a fixing device (not shown). Details of the fixing device are disclosed in JP 2018-65662 A. Specifically, the fixing device has an engaging member provided on the auxiliary cylinder 1 and an engaged member provided on the mast 15. When the extension length of the rod 3a of the hydraulic cylinder 3 of the auxiliary cylinder 1 is set to a predetermined length while the auxiliary cylinder 1 is aligned with the mast 15, the engaging member engages with the engaged member, thereby fixing the auxiliary cylinder 1 to the mast 15. On the other hand, when the extension length of the rod 3a of the hydraulic cylinder 3 of the auxiliary cylinder 1 is set to a length other than the predetermined length while the auxiliary cylinder 1 is aligned with the mast 15, the engagement of the engaging member with the engaged member is released, thereby releasing the fixation of the auxiliary cylinder 1 to the mast 15.

[0028] In this embodiment, as shown in Fig. 6, when storing the auxiliary cylinder 1 on the ventral surface of the mast 15, it is necessary to tilt the hydraulic cylinder 3 with respect to the link 2 and align the hydraulic cylinder 3 with the ventral surface of the mast 15. However, in Fig. 4, if the diameters of the holes 8 through which the first pins 6 are inserted are equal to the diameter of the first pins 6, the hydraulic cylinder 3 cannot be tilted with respect to the link 2.

[0029] 4, the hole 8 through which the first pin 6 on the hydraulic cylinder 3 side (the first pin 6 on the lower side in the figure) of the two first pins 6 is inserted is formed as an elongated hole 8a. The elongated hole 8a is long in the swing direction of the link 2 relative to the mast 15 (the left-right direction in the figure). On the other hand, the diameter of the hole 8 through which the first pin 6 on the link 2 side (the first pin 6 on the upper side in the figure) of the two first pins 6 is inserted is set to be equal to the diameter of the first pin 6.

[0030] With this configuration, compared to a case where the diameter of the holes 8 through which the first pins 6 are inserted is equal to the diameter of the first pins 6, the hydraulic cylinder 3 can swing relative to the link 2 by the length of the elongated hole 8a, centered on the first pin 6 on the link 2 side. In other words, the hydraulic cylinder 3 can be tilted relative to the link 2 by the length of the elongated hole 8a. And, as shown in Fig. 7, which is an enlarged view of the main part D in Fig. 6, by tilting the hydraulic cylinder 3 relative to the link 2, the hydraulic cylinder 3 can be aligned along the abdominal surface of the mast 15.

[0031] In addition, of the two first pins 6, the diameter of the hole 8 through which the first pin 6 on the hydraulic cylinder 3 side (the first pin 6 on the lower side in the figure) is inserted may be made equal to the diameter of the first pin 6, and the hole 8 through which the first pin 6 on the link 2 side (the first pin 6 on the upper side in the figure) is inserted may be formed as an elongated hole 8a.

[0032] (effect) As described above, according to the auxiliary cylinder 1 of this embodiment, the swing angle of the link 2 relative to the mast 15 is restricted by the stopper 5. Therefore, the degree of freedom of swing of the link 2 relative to the mast 15 can be limited. In addition, the other end of the link 2 and one end of the hydraulic cylinder 3 are connected by a plurality of first pins 6, and the other end of the hydraulic cylinder 3 and the bracket 4 are connected by a plurality of second pins 7. As a result, the degree of freedom of swing of the hydraulic cylinder 3 relative to the link 2 and the degree of freedom of swing of the bracket 4 relative to the hydraulic cylinder 3 can be lowered compared to a case in which the other end of the link 2 and one end of the hydraulic cylinder 3 are connected by one pin and the other end of the hydraulic cylinder 3 and the bracket 4 are connected by one pin. As a result, it is possible to suppress load shaking when the crawler 11a or the like is lifted by the auxiliary cylinder 1.

[0033] Furthermore, the holes 8 through which the other first pins 6 than one of the multiple first pins 6 are inserted are formed as elongated holes 8a that are long in the swing direction of the link 2 relative to the mast 15. This allows the hydraulic cylinder 3 to be tilted relative to the link 2 by the length of the elongated holes 8a, compared to a case in which the diameters of the holes 8 through which the first pins 6 are inserted are equal to the diameters of the first pins 6. Therefore, even if it is necessary to tilt the hydraulic cylinder 3 relative to the link 2 to align the hydraulic cylinder 3 with the ventral surface of the mast 15 when storing the auxiliary cylinder 1 on the ventral surface of the mast 15, by tilting the hydraulic cylinder 3 relative to the link 2, the hydraulic cylinder 3 can be aligned with the ventral surface of the mast 15.

[0034] Although the embodiments of the present invention have been described above, they are merely illustrative examples and do not limit the present invention, and the specific configurations and the like can be appropriately modified in design. Furthermore, the actions and effects described in the embodiments of the invention are merely a list of the most preferable actions and effects resulting from the present invention, and the actions and effects of the present invention are not limited to those described in the embodiments of the present invention. [Explanation of symbols]

[0035] 1 Auxiliary cylinder 2 Links 3 Hydraulic Cylinders 3a Rod 4 Bracket 5 Stopper (regulating member) 5a Claw member 6 1st pin 7 2nd pin 8 holes 8a long hole 10 Crane (working machine) 11 Undercarriage 11a Crawler 12 Upper rotating body 13 Swivel frame 14. Boom 15 Mast (elevation member) 16 Winch 17 Lower spreader 18 Counterweight 19 Backstop device 20 Guy Link 21 Upper spreader 22 Boom hoisting rope 23 Backstop receiver

Claims

1. a link having one end swingably connected to a hoisting member of the work machine; a hydraulic cylinder having one end connected to the other end of the link; A bracket connected to the other end of the hydraulic cylinder; a restricting member attached to the one end of the link and configured to restrict a swing angle of the link relative to the hoisting member; having The other end of the link and the one end of the hydraulic cylinder are connected by a plurality of first pins, An auxiliary cylinder, characterized in that the other end of the hydraulic cylinder and the bracket are connected by a plurality of second pins.

2. The auxiliary cylinder according to claim 1, characterized in that holes through which the other first pins other than one of the plurality of first pins are inserted are formed as elongated holes that are long in the swing direction of the link relative to the undulating member.

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