JP4596809B2 - High cab type crawler crane - Google Patents

Description

  The present invention relates to a crawler crane which is a kind of mobile crane, and more particularly to a high cab type crawler crane.

  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. 7 is a side view of a typical crawler crane disclosed in Non-Patent Document 1. 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. 8 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 main body of the crawler frame f has a hollow box structure, and a idler 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 crawler frame f is connected to a front end and a rear end of the car body e by a crawler coupling device such as four axles m extending in the left-right direction, a hollow axle box n, and a crawler telescopic cylinder k. The distance between the left and right crawler frames f can be adjusted by expanding and contracting the crawler telescopic cylinder k.

  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.

  FIG. 9 is a side view of the high cab type crawler crane shown in the photograph disclosed in Non-Patent Document 3, and FIG. 10 is a front view mainly showing a cab portion. In the figure, i is the cab. The cab i is provided so as to be lifted by a box-shaped base q provided on an upper turning body (swivel frame) c and a post r provided thereon. When working in a place where there is an obstacle such as a kite in the front and the prospect of lifting is not good, the operator's cab i is lifted to a high position and used so that the operator can see the work well from the operator's cab i. . s is a vertical ladder provided along the post r. The lower end of the vertical ladder s is fixed to the lower bracket t attached to the revolving frame c so as to protrude laterally, and the upper end of the vertical ladder s is fixed to the upper bracket u attached to the upper end of the post r. w is a landing that enters and exits cab i. v is a safety fence for the vertical ladder s, and x is a handrail for the landing w. In this example, the height of the cab floor is about 6 m.

Editor Ishikawajima Construction Machinery Co., Ltd. DCH series High line pull crawler crane catalog Date of issue September 1990 Page 3 DCH6020 (high cab specification) photo

The driver's cab i of the conventional high cab type crawler crane was not so high, so even if the driver moved up and down using the vertical ladder, there was no problem with the operation. However, when the position of the operator cab i becomes considerably high, it is difficult for the driver to move up and down using the vertical ladder, and there is a problem in safety.

The present invention has been devised in view of such problems of the prior art, and even if the cab i is lifted to a high position, the driver can easily move up and down to the cab i and is a safe high cab type crawler. The purpose is to provide a crane.

  In order to achieve the above object, a high cab type crawler crane according to the present invention includes a lower traveling body and an upper swing body, and is a high cab type crawler crane having a cab at a high position in front of the upper swing body. A driver's cab support post that is provided at the front end of the swivel frame and supports the driver's cab, an intermediate landing post that is provided at the rear part of the swivel frame and supports the intermediate landing, and a lower portion that extends laterally from the front end of the swivel frame. Overhang from the top of the landing and the driver's cab support post, provided between the upper landing that enters and exits the cab, the lower stairs provided between the lower landing and the intermediate landing, and the intermediate landing and the upper landing The lower stairs and the upper stairs are provided so as to be shifted from side to side.

  It is preferable that the upper end of the lower stairs and the lower end of the upper stairs are respectively supported via links from the upper part of the intermediate landing support post.

  Next, the operation of the present invention will be described. A mid-level landing is provided at the rear end of the upper swing frame, and the upper and lower stairs are arranged in a square shape when viewed from the side. The inclination of the can be made gentle. Furthermore, the swivel frame bends considerably during loading and unloading work, but if the upper and lower stairs and the intermediate landing frame support frame are fixed together, the deflection of the stairs and the intermediate landing frame support frame cannot fully absorb the bending of the swivel frame. There is a risk of damaging the chamber support posts, stairs or intermediate landing support frame with excessive force. Therefore, as described in claim 2, if the upper end of the lower stairs and the lower end of the upper stairs are supported via a link from the upper part of the intermediate landing support post, the intermediate landing support is supported by bending of the swivel frame during cargo handling work. Since the movement of the upper part of the post in the front-rear direction is allowed by the link, no excessive force is applied to the cab support post, the intermediate landing post support and the upper and lower stairs.

  As described above, the high cab type crawler crane according to the present invention uses a gently inclined staircase to enter and exit the operator's cab at a high position, so the burden on the driver is light and the safety is high. In addition, the upper end of the lower stairs and the lower end of the upper stairs are supported via links from the upper part of the intermediate landing support post, so that excessive force is not applied to the cab support post, stairs, intermediate landing support post, etc. There is no risk of damage to the support.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view of a high cab type crawler crane of the present invention. FIG. 2 is also a plan view. FIG. 3 is an AA arrow view of FIG. 4 is a view taken in the direction of arrows BB in FIG. FIG. 5 is an enlarged view of the lower end of the lower staircase. FIG. 6A is an enlarged view of the attachment portion between the upper support portion of the intermediate landing support post and the lower staircase, and FIG. 6B is the attachment portion of the support frame upper portion of the intermediate landing post and the upper staircase. FIG. 6C is an enlarged view of the upper end portion of the upper staircase. 1 to 6, reference numeral 1A denotes a high cab type crawler crane (hereinafter simply referred to as “crawler crane”). 1 is a lower traveling body of the crawler crane 1A, and 1a is a car body. Reference numeral 2 denotes a crawler frame provided on the left and right of the car body 1a. Reference numeral 3 denotes an endless crawler shoe, a drive wheel 7 provided at the rear end of the crawler frame 2, an idler wheel 8 provided at the front end of the crawler frame 2, a plurality of lower rollers 4 a provided at the lower part of the crawler frame 2, and an upper part thereof. The plurality of upper rollers 4b provided are provided so as to surround them. Reference numeral 5 denotes a slewing bearing provided at the center of the car body 1a. Reference numeral 6 denotes a swing frame of the upper swing body 6 </ b> A connected on the swing bearing 5. 29 is a lattice jib attached to the front part of the revolving frame 6, and 30 is a counterweight attached to the rear part of the revolving frame 6.

  A base 9 is provided on the right side of the front end of the revolving frame 6. Reference numeral 10 denotes a cab support post (yagura) provided on the base 9. Reference numeral 11 denotes a cab supported on the cab support post 10. A maintenance landing 27 is provided below the cab 11, 27 a is a side portion thereof, 27 b is a front portion, and 27 c is a handrail. Reference numeral 28 denotes a vertical ladder for moving up and down between the maintenance landing 27 and an upper landing 23 described later. In this example, the height of the floor surface of the cab 11 is about 11 m.

  Reference numeral 12 denotes an intermediate landing support post (yagula) provided in the rear part of the revolving frame 6. As shown in FIG. 4, about half of the width of the pair of front and rear upper horizontal connecting members 12a of the intermediate landing support post 12 projects sideways, and both ends thereof are connected to the pair of left and right upper horizontal connecting members 12b. A rectangular frame is formed. The front end portion of the upper horizontal connecting member 12a projecting laterally is supported by a support member 12c projecting obliquely upward from the middle of the intermediate landing support post 12.

  Reference numeral 13 denotes a support frame provided on the intermediate landing support post 12 and having a substantially parallelogram with the upper end inclined rearward, and approximately half of the left and right widths projecting sideways. The support frame 13 is connected to a pair of front and rear horizontal connecting members 13a provided so as to project laterally, and a pair of left and right lower horizontal connecting members 13b connected to both ends thereof to connect the upper horizontal connecting member of the intermediate landing support post 12 The same rectangular frame as 12a and 12b is formed. Reference numeral 13c denotes a lower horizontal intermediate connecting member connected in the front-rear direction between a pair of front and rear horizontal connecting members 13a (FIG. 4). The upper horizontal connecting members 12 a and 12 b of the intermediate landing post support post 12 and the lower horizontal connecting members 13 a and 13 b of the support frame 13 are fastened by bolts 20. 13d is an inclined member provided at both ends of the lower horizontal connecting member 13a and the front side of the intermediate portion, and 13e is provided in the middle of the lower horizontal connecting member 13b and the lower horizontal intermediate connecting member 13c on the protruding side. It is a protrusion.

  Reference numeral 14 denotes a rectangular intermediate landing provided on the upper surface of the support frame 13, which is connected to a lower staircase 15 </ b> A and an upper staircase 15 </ b> B of the staircase 15, which will be described later, while being shifted from side to side. 14 a is a handrail of the intermediate landing 14.

  The staircase 15 has two steps, a lower staircase 15 </ b> A and an upper staircase 15 </ b> B, and is arranged between the cab 11 and the swivel frame 6 in a letter-like shape when viewed from the side. As shown in FIG. 5, the lower end portion of the lower staircase 15A is fastened by a bolt 31 to a lower landing 16 that projects from the base 9 of the swivel frame 6 and is attached thereto, and the upper end is shown in FIG. As shown, a protrusion 15b provided on the lower surface near the upper end of the lower staircase 15A and a protrusion 13e provided in the middle of the lower horizontal connecting member 13b on the side projecting to the side of the support frame 13 above the intermediate landing support post 12, The lower horizontal intermediate connecting member 13c is connected by a link 17 to a protrusion (not shown) provided in the middle. Both ends of the link 17 are connected by a projection 15b, a projection 13e, and pins 18a, 18b. Since the lower staircase 15A is provided along the inclined surface of the inclined member 13d of the support frame 13, it does not interfere with the support frame 13. As shown in FIG. 4, the lower end of the upper staircase 15B is located on the left side of the lower staircase 15A at the intermediate landing 14 and, as shown in FIG. 6B, the middle of the inclined member 13d on the left side of the support frame 13 And a protrusion (not shown) provided on the intermediate inclined member and a protrusion 15d provided on the lower surface of the lower end of the upper step 15B. Both ends of the link 21 are connected by the protrusions 19 and 15d and pins 22a and 22b. The driver ascends from the lower stairs 15A to the intermediate landing 14 and moves to the upper stairs 15B on the left side at the intermediate landing 14 and ascends the upper stairs 15B. The upper landing 23 is provided so as to protrude from the back surface and the right side surface of the cab 11, and the driver who has ascended from the upper stairs 15 </ b> B enters the cab 11 by going around the side surface from the back of the cab 11. As shown in FIG. 6C, the upper end of the upper staircase 15 </ b> B is connected by a bracket 25 and a pin 26 of a support member 24 that protrudes downward and behind the upper landing 23. 23a is a handrail of the upper landing 23. Reference numeral 32 denotes a connecting bolt between the bracket 25 and the support member 24.

  Next, the operation of the embodiment of the present invention will be described. Since a landing 14 having an intermediate height is provided behind the revolving frame 6 of the upper revolving structure 6A and the upper and lower steps 15A and 15B are arranged in a square shape when viewed from the side, the upper revolving structure 6A greatly overhangs and obstructs the turning. Without this, the inclination of the stairs 15 can be made gentle. The upper end of the lower staircase 15A and the lower end of the upper staircase 15B are supported from the upper part of the intermediate landing stage support post 13 via the links 17 and 21, and in the front-rear direction of the upper part of the intermediate landing stage support post 13 due to the bending of the swivel frame 6 during cargo handling work. Since the movement is permitted by the links 17 and 21, an excessive force is not applied to the cab support post 10, the intermediate landing post support 12, and the upper and lower stairs 15A and 15B.

  The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the gist of the present invention. For example, when the height of the cab is not so high, the stairs may be climbed up to the cab with one step from the turning frame without dividing the stairs into two steps. In that case, the upper end of the stairs and the landing in the cab are connected via a link.

It is a side view of the high cab type crawler crane of the present invention. It is a top view of the high cab type crawler crane of the present invention. It is an AA arrow line view of FIG. It is a BB arrow line view of FIG. It is an enlarged view of the lower end part of a lower staircase. (A) is an enlarged view of the attachment portion between the support frame at the upper end of the stairs support post and the lower stairs, and FIG. 6 (B) is an enlarged view of the attachment portion between the support frame at the upper end of the stairs support post and the upper stairs. FIG. 6C is an enlarged view of the upper end of the upper staircase. 1 is a side view of a typical crawler crane disclosed in Non-Patent Document 1. FIG. 6 is a perspective view of a lower traveling body disclosed in Non-Patent Document 2. FIG. It is a side view of the high cab type crawler crane shown in the photograph indicated by nonpatent literature 3. FIG. 10 is a front view mainly showing a cab of FIG. 9.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A High cab type crawler crane 1 Lower traveling body 2 Crawler frame 6A Upper revolving body 6 Revolving frame 7 Lattice jib 10 Driver's cab support post (Yagura)
11 cab 12 intermediate landing support post 13 support frame 14 intermediate landing 15 stairs 15A lower stairs 15B upper stairs 17, 21 link 23 upper landing

Claims (1)

In a high cab type crawler crane having a lower traveling body and an upper swing body and having a driver's cab at a high position in front of the upper swing body, a driver's cab provided at the front end of a swing frame of the upper swing body and supporting the driver's cab A support post, an intermediate landing support post that is provided at the rear of the swivel frame and supports the intermediate landing, a lower landing provided to project laterally from the front end of the swivel frame, and an extension from the upper end of the cab support post. It consists of an upper landing that enters and exits, a lower stairs provided between the lower landing and the intermediate landing, and an upper stairs provided between the intermediate landing and the upper landing. The lower stairs and the upper stairs are located on the left and right. the provided by shifting, the upper and lower ends of the upper stair bottom stairs, this from the intermediate landing support post top is supported via links, respectively Haikyabu type crawler crane characterized by.

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