JP4407911B2 - Crawler coupling method of crawler crane - Google Patents

Description

  The present invention relates to a crawler crane that is a kind of mobile crane, and more particularly to a crawler coupling device that couples a car body and a crawler frame.

  The crawler crane was developed by specially developing a crane with a lattice jib among various front attachments attached to a mechanical excavator excavator. The crawler type has a traveling speed of 1 to 3 km / h. The structure is not suitable for running on public roads, but it has the advantages of excellent stability, good running performance on rough and soft terrain, and easy movement on the work site. Yes, it is widely used for construction work such as civil engineering, architecture and port construction.

FIG. 1 is a side view of a typical crawler crane disclosed in Non-Patent Document 1. FIG. In the figure, a is a lower traveling body, c is an upper swing body, b is a swing bearing that connects the upper swing body c and the lower travel body a, and d is a lattice jib. FIG. 2 is a perspective view of the lower traveling body a disclosed in Non-Patent Document 2.

Editor Japan Society of Mechanical Engineers, Book Title Mechanical Engineering Handbook, Engineering C3 Transporting Machine, Edition Number, First Edition, Japan Society of Mechanical Engineers, Date of Publication, June 1, 1991, page C3-30 Author Satoshi Ito, Book title Knowledge of mobile crane, edition number First edition, publication place Kashima Publishing Co., Ltd. Date of publication December 20, 1994, page 42

  The lower traveling body a includes a car body e and a crawler frame f attached to the left and right of the car body e. The crawler frame f has a hollow box structure, and a free wheel g is attached to the front end thereof, and a drive wheel h is attached to the rear end thereof, and a crawler shoe j is attached surrounding them. The car body e and the crawler frame f are coupled by a crawler coupling device described later. s is a lower roller.

  A driving diesel engine, a hydraulic pump, a hydraulic oil tank, a main winch, an auxiliary winch, and the like are attached to the upper swing body c in addition to the cab i and the lattice jib d. For general construction, those up to 50t that can be transported without disassembling the main body are often used, and larger ones are transported with the main body disassembled. The vehicle is driven by a pair of left and right crawlers, but the hydraulically driven one can move the left and right crawlers at different speeds or move in the opposite direction for high mobility. Many small machines use a hydraulic cylinder to reduce the width between the left and right crawlers during transportation, and large machines remove the crawler during transportation.

  Next, a conventional crawler coupling device will be described. 3A and 3B are explanatory views of the crawler coupling device disclosed in Patent Document 1. FIG. 3A is a side view of the crawler frame f, and FIG. 3B is a view taken along the line BB in FIG. As shown in FIGS. 2 and 3, the car body e has four axles m extending in the left-right direction at the front end and the rear end. The axle m has a square cross section as shown. Two hollow axle boxes n penetrating in the left-right direction and circumscribing the axle m are provided in the middle part of the crawler frame f in the front-rear direction. The distance between the left and right crawler frames f can be adjusted by expanding and contracting the crawler telescopic cylinder k.

JP 2003-137145 A

As described above, the large crawler crane removes the crawler frame f from the car body e, transports it by truck, and assembles it at the construction site. In such a crawler crane, the distance between the left and right crawler frames f is constant, and is not expanded or contracted.

  A conventional crawler coupling device for a large crawler crane is shown in FIG. The structure is similar to that shown in FIG. In other words, two axle boxes n each having a hollow structure and penetrating in the left-right direction are provided in the middle part of the crawler frame f in the front-rear direction, and the axle m of the car body e is inserted there and fixed with the pin p. To do. Note that q is a hydraulic cylinder, which is used to push out and retract the crawler frame f.

  The conventional crawler coupling device shown in FIG. 4 has the following problems. (1) To connect the crawler, the main body (car body e) is jacked up, the crawler frame f is aligned with the crane suspended, and the axle m is inserted into the axle box n. It is very difficult to align the crane by fine adjustment. (2) Although the state where the main body is jacked up is unstable, the car body e and the crawler frame f must be separated and coupled in this state, and the operator is very nervous. (3) The hydraulic cylinder q is used to push out the crawler frame f to separate the crawler frame f from the car body e, and to pull in the crawler frame f to connect the crawler frame f to the car body e. However, when the crawler frame f and the car body e are separated and joined, the hydraulic cylinder q and the crawler frame f also need to be separated and joined, which is troublesome and inconvenient. (4) In order to insert the axle m into the axle box n, a certain amount of clearance is required between them. However, during operation of the crawler crane, the clearance causes vibration and the like, and the clearance after assembly is blocked. Insert a shim. It takes a lot of time to insert the shim.

The present invention has been devised in view of such problems of the prior art, and an object of the present invention is to provide a crawler coupling device for a crawler crane that can easily couple a car body and a crawler frame.

In order to achieve the above object, a crawler coupling device for a crawler crane according to claim 1 of the present application detachably couples each crawler frame and car body provided on the left and right sides of the car body by a pair of front and rear crawler coupling means. A crawler coupling device for a crawler crane, wherein each crawler coupling means is secured to a car body side female fitting portion composed of two vertically extending protrusions fixed to the car body side, Crawler frame-side male fitting part consisting of a single protrusion inserted into the mold fitting part, a crawler coupling pin inserted so as to be inserted into and removed from both fitting parts horizontally, and a car body side female The hydraulic cylinder that is installed in the mold fitting part and inserts and removes the crawler coupling pin, and the upper surface is attached inside the through hole of the female fitting part on the car body side The crawler frame is composed of a lower guide that is inclined downward and an upper guide that protrudes from the crawler frame toward the car body and has a lower surface that is inclined at the same inclination angle as that of the lower guide. The lower guide and the upper guide are brought into sliding contact with the inclined surfaces of the upper guide and the crawler frame is drawn toward the car body side, and the crawler frame side is provided with a head portion of the car body side female fitting portion. It consists of left and right alignment bolts that come into contact with the tip portion.

  A crawler coupling device for a crawler crane according to claim 2 of the present application is provided with a pair of front and rear vertical surfaces between a pair of front and rear crawler coupling means on the car body side, and the pair of crawler frames on the crawler frame side. And a front-rear alignment guide provided with a protrusion having a pair of vertical surfaces which are inserted between the vertical surfaces and are in sliding contact with each other.

Next, the operation of the first aspect of the invention will be described. To connect the crawler, jack up the main body (car body), bring the crawler frame close to the car body in a state of being suspended by a crane, align the positions, and then connect. The part that connects the car body and the crawler frame includes a car body side female fitting part that consists of two vertically extending protrusions fixed to the car body side, and a female type fitting part fixed to the crawler frame. Since the male-female coupling method is composed of a crawler frame-side male fitting part made up of a single protrusion inserted in the male type, the male type can be inserted into the female type only by positioning in the front-rear direction. Thereafter, while lowering the crawler frame, the inclined surfaces of the lower guide and the upper guide are brought into sliding contact with each other to draw the crawler frame toward the car body. In the meantime, when the head of the left and right alignment bolts provided on the crawler frame side abuts against the tip of the car body side female fitting portion, the vertical and horizontal positions of the holes that horizontally penetrate both fitting portions The alignment is completed, and the crawler coupling pin can be inserted into the hole by the hydraulic cylinder to complete the coupling. When the left and right crawler frames are joined, the jack that jacks up the car body is contracted to complete the joining operation. The removal of the crawler frame from the car body is the opposite operation to the above and will not be described.

Next, the operation of the second aspect of the invention will be described. By inserting protrusions on the crawler frame side between a pair of front and rear vertical surfaces between a pair of front and rear crawler coupling means on the car body side, alignment in the front and rear direction can be facilitated.

Since the crawler coupling device of the crawler crane of the present invention has the above-described configuration, it has the following excellent effects. (1) Since the conventional crawler coupling device shown in FIG. 4 inserts the axle into the axle box, it is necessary to align the front and rear and the top and bottom. It is only necessary to align the front and rear to insert the. (2) The hydraulic cylinder for inserting and removing the crawler coupling pin does not need to be removed unlike the conventional one. (3) If the alignment guide is welded in the field at the time of factory assembly, even if there is a manufacturing error in the crawler frame or the car body, it does not affect the alignment of the hole that penetrates the fitting portion horizontally. (4) If the left and right alignment bolts are aligned during factory assembly, no adjustment is required thereafter. (5) As a result of repeated separation and coupling between the crawler frame and the car body, even if the sliding contact surface of the alignment guide wears out, the tilt angle of the sliding contact surface does not change. It is possible to align the holes that penetrate the fitting portion horizontally.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 5A and 5B are explanatory views of the crawler coupling device of the crawler crane according to the present invention, in which FIG. 5A is a plan view, FIG. 5B is a view taken along arrow B-B in FIG. 5A, and FIG. FIG. FIG. 6 is a front view for explaining a coupling state of the crawler coupling device of the crawler crane of the present invention, showing a state before coupling on the left side and a state after coupling on the right side. In these figures, 1 is a car body and 2 is a crawler frame. The crawler frame 2 is provided on the left and right sides of the car body 1 as shown in the figure, and the main body has a hollow box structure and is detachably coupled by a crawler coupling device A. The crawler coupling device A includes crawler coupling means 4 provided in a pair (four in total) on the left and right side surfaces of the left and right front ends and the rear end of the car body 1.

  Reference numeral 3 denotes a jack-up device for lifting the car body 1 when the crawler frame 2 is attached or detached. As shown in FIG. 5A, a total of four jack up devices are provided at the front and rear end portions of the car body 1. The jack-up device 3 includes a hydraulic cylinder 3a, a pedestal 3b attached to the lower end of the piston rod of the hydraulic cylinder 3a, and a swingable arm 3c that supports the cylinder portion of the hydraulic cylinder 3a at two intermediate positions.

The crawler coupling means 4 is fixed to the car body side female fitting portion 4A composed of two vertically extending protrusions 4a fixed to the side surface of the car body 1, and the side surface of the crawler frame 2 on the car body 1 side. The crawler frame side male fitting part 4B which consists of one protrusion 4b inserted in the female fitting part 4A is provided. The protrusion 4a is welded to a seat plate 4m provided on the side surface of the car body 1. A bracket 4f extending horizontally from the upper end of the main body of the crawler frame 2 to the car body side is provided on the upper portion of the single protrusion 4b. The upper end of the single protrusion 4b and the center of the lower surface of the bracket 4f are welded. ing. Reference numeral 4c denotes a crawler coupling pin that is removably inserted into a hole 4e that horizontally penetrates both fitting portions 4A and 4B. 4d is a cylinder on the side of the projection 4a of the car body side female fitting portion 4A (the rear projection 4a for the front female fitting portion 4A and the front projection 4a for the rear female fitting portion 4A). This is a hydraulic cylinder that is attached via a bracket 4g and is inserted into and removed from the crawler coupling pin 4c. The tip of the piston rod of the hydraulic cylinder 4d and the rear end of the crawler coupling pin 4c are connected by a pin 4h. 4i is a retaining means for preventing the pin 4c from coming out of the hole 4e, and comprises a collar 4j through which the tip end of the pin 4c penetrates and a pin 4k through which they penetrate.

Reference numeral 5 denotes an alignment guide. The alignment guide 5 is mounted above the through hole 4e of the car body side female fitting portion, and the lower guide 5a whose upper surface is an inclined surface 5c descending inward, and the crawler frame 2 to the car body 1 The upper guide 5b is welded to the lower surface of the bracket 4f that is attached to the side of the lower guide 5a, and the lower surface is an inclined surface 5d having the same inclination angle as the inclined surface 5c of the lower guide 5a. The inclined surfaces 5c and 5d of the side guide 5a and the upper guide 5b are brought into sliding contact with each other to draw the crawler frame 2 toward the car body 1 side. 6 is a left-right alignment bolt. The left and right alignment bolt 6 is a bolt screwed into a seat 6a provided on the side of the main body of the crawler frame 2 adjacent to one protrusion 4b of the male fitting portion 4B, and has a lock nut. The head portion comes into contact with the tip end portion of the protrusion 4a of the car body side female fitting portion in the coupled state.

Reference numeral 7 denotes a hanging metal fitting on the outside of the crawler frame 2, which includes a bracket 7 a fixed to the outer side surface of the crawler frame 2 and an arm 7 b that is swingably attached to the tip of the bracket 7 a via a pin. A shackle 10 is attached to the tip of the arm 7b. Reference numeral 8 denotes a hanging metal fitting inside the crawler frame 2 provided at the top end of the bracket 4f, and a shackle 10 is attached to the upper end. A wire rope 9 is hooked on a hook suspended from the tip or middle of the jib d. 9a is a stopper at the end of the wire rope 9.

  Reference numeral 12 denotes a front-rear positioning guide. Between the pair of front and rear crawler coupling means 4 on the car body 1 side, a pair of vertical surfaces facing each other are provided. That is, the rear surface of the seat plate 4m of the front crawler coupling means 4 is a vertical surface 4p extending toward the crawler frame, and the front surface of the seat plate 4m of the rear crawler coupling means 4 is a vertical surface extending toward the crawler frame. The surface 4p is formed, and the pair of vertical surfaces 4p and 4p face each other in the front-rear direction. On the other hand, a protrusion 4n is provided at the tip of a bracket 4f extending horizontally from the upper end of the main body of the crawler frame 2 toward the car body. The protrusions 4n are provided at the rear part of the front bracket 4f and the front part of the rear bracket 4f, respectively, and the front and rear surfaces of the protrusions 4n are vertical surfaces 4q extending toward the car body 1. These vertical surfaces 4q, 4q are inserted so as to be in sliding contact between the pair of vertical surfaces 4p, 4p facing each other in the front-rear direction, and the front-rear alignment of the car body 1 and the crawler frame 2 is performed.

  The operation of this embodiment will be described below. To connect the car body 1 and the crawler frame 2, the main body (car body 1) is jacked up using the jack-up device 3, and the crawler frame 2 is hung by its own jib d or another crane. Close to the car body 1 in the state, align and align. A portion that joins the car body 1 and the crawler frame 2 is fixed to the crawler frame 2 and a car body side female fitting portion 4A formed of two protrusions 4a extending in the vertical direction fixed to the car body 1 side. Since it is a male-female coupling system consisting of a crawler frame side male fitting part 4B consisting of one protrusion 4b inserted into the female fitting part 4A, the male type 4B can be changed into a female by simply aligning in the front-rear direction. It can be inserted into the mold 4A. Thereafter, while lowering the crawler frame 2, the inclined surfaces 5c and 5d of the lower guide 5a and the upper guide 5b are brought into sliding contact with each other, and the crawler frame 2 is drawn toward the car body 1 side. In the meantime, when the head of the left and right alignment bolt 6 provided on the crawler frame 2 side comes into contact with the tip of the car body side female fitting portion 4A, a hole 4e that horizontally penetrates both fitting portions 4A and 4B. , And the crawler coupling pin 4c can be inserted into the hole 4e by the hydraulic cylinder 4d to complete the coupling. When the coupling of the left and right crawler frames is completed, the jack 3a that jacks up the car body 1 is contracted to complete the coupling operation. The removal of the crawler frame 2 from the car body 1 is an operation opposite to the above, and a duplicate description is omitted.

  The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the invention.

It is a side view of the conventional typical crawler crane. It is a perspective view of the lower traveling body of a crawler crane. It is explanatory drawing of the conventional crawler coupling device, (A) is a side view of a crawler frame, (B) is a BB arrow line view of (A). It is explanatory drawing of the conventional crawler coupling device, (A) is a partial top view of a lower traveling body, (B) is a BB arrow line view of (A). It is explanatory drawing of the crawler coupling device of this invention, (A) is a partial top view of a lower traveling body, (B) is a BB arrow line view of (A), (C) is a top view of a crawler coupling pin part. FIG. It is a front view explaining the coupling | bonding state of the crawler coupling apparatus of the crawler crane of this invention, The state before coupling | bonding is shown on the left side, and the state after coupling | bonding is shown on the right side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car body 2 Crawler frame 3 Jackup apparatus 4 Crawler coupling means 5 Alignment guide 6 Left and right alignment bolt

Claims (2)

A crawler coupling method of a crawler crane in which each crawler frame 2 provided on the left and right of a car body 1 and the car body 1 are detachably coupled by a pair of front and rear crawler coupling means 4, each crawler coupling means 4 being a car A car body side female fitting portion 4A composed of two vertically extending protrusions fixed to the body 1 side, and a single protrusion inserted into the female fitting portion 4A fixed to the crawler frame 2 The crawler frame side male fitting portion 4B, the crawler coupling pin 4c inserted in the hole 4e penetrating both the fitting portions horizontally, and the crawler provided on the car body side female fitting portion 4A. A hydraulic cylinder 4d for inserting / removing the coupling pin 4c, and a slope 5c attached to the upper part of the through hole 4e of the car body side female fitting portion 4A and having an upper surface descending inward. The crawler frame 2 includes a lower guide 5a and an upper guide 5b attached to the crawler frame 2 so as to protrude from the crawler frame 2 and having an inclined surface 5d having the same inclination angle as the inclined surface 5c of the lower guide 5a. The lower guide 5a and the upper guide 5b are brought into sliding contact with the inclined surfaces of the lower guide 5a and the upper guide 5b so as to draw the crawler frame 2 toward the car body 1 and the crawler frame 2 is provided. The left and right positioning bolts 6 are in contact with the tip of the female fitting portion 4A, and the front and rear of the car body 1 and the crawler frame 2 are formed by the female fitting portion 4A and the male fitting portion 4B. The crawler coupling pin 4c positions the car body 1 and the crawler frame 2 in the direction perpendicular to the front-rear direction. The left and right alignment bolt 6 has a lock nut so that the screwing depth can be adjusted, and the jack-up device 3 provided at the left and right ends of the front and rear surfaces of the car body 1 is provided. A first step of jacking up the car body 1 using, a second step of lifting the crawler frame 2 horizontally with a crane and bringing it closer to the car body 1, and a female fitting portion 4A and a male fitting portion 4B in the front-rear direction. And the third step of inserting the male fitting portion 4B into the female fitting portion 4A, and pulling the crawler frame 2 toward the car body 2 using the alignment guide 5 while lowering the crawler frame 2, The fourth step of bringing the tip of the mold fitting portion 4A into contact with the head of the left and right alignment bolt 6 and the hydraulic cylinder 4d are closed in a hole 4e that horizontally penetrates both fitting portions. A crawler coupling method for a crawler crane, comprising: a fifth step of inserting the roller coupling pin 4c; and a sixth step of contracting the jackup device 3 jacking up the car body 1 . In the third step, the female fitting part 4A and the male fitting part 4B are aligned in the front-rear direction between the pair of front and rear crawler coupling means 4 on the car body 1 side. provided with a vertical surface, the crawler frame 2 side and the front and rear alignment guide 12 formed by providing a projection having a vertical plane of a pair of inserted sliding contact between the vertical surfaces of the pair is provided, the The vertical surfaces facing the pair of front and rear are the rear surface of the seat plate 4m to which the front car body side female fitting portion 4A is attached and the front surface of the seat plate 4m to which the rear car body side female fitting portion 4A is attached. The pair of vertical surfaces that are inserted and slidably contacted between the pair of vertical surfaces extend horizontally from the upper end of the crawler frame 2 toward the car body 1 and have a crawler frame side male fitting portion at the center of the lower surface. The upper end of the 4B protrusion is welded The rear surface of the protrusion 4n at the tip of the front bracket 4f and the upper end of the crawler frame 2 extend horizontally toward the car body 1, and the upper end of one protrusion of the crawler frame side male fitting portion 4B is welded to the center of the lower surface. 2. A crawler crane according to claim 1, wherein the crawler crane is a front surface of a projection 4n at a tip of a rear bracket 4f, and uses the front / rear alignment guide 12 to perform front / rear alignment of the car body 1 and the crawler frame 2. Crawler combination method .

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