JP2016113292A - Boom mounting device and crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a cost of manufacture of a crane.SOLUTION: A boom mounting device for mounting a boom to a main frame of a crane includes: a pair of right and left of a lifting device for hanging and supporting the boom; and a support base for supporting a pair of the lifting device. By operating each of the pair of the lifting device independently, inclinations of right and left of the boom is adjusted.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a boom mounting device and a crane.

  A crane is known that includes a traveling body, a revolving body, and a boom that is rotatably supported by the revolving body (see Patent Document 1). In the technique described in Patent Document 1, when the support pin attached to the boom is placed on the pin receiving seat of the foot bracket on the revolving structure, the foot pin is not connected to the boss hole of the foot bracket and the boss hole of the foot part of the boom. It is comprised so that it can penetrate. The support pin is attached to a protrusion provided on the upper surface of the foot portion of the boom or a receiving seat provided on the upper surface of the foot portion of the boom.

JP 2006-282287 A

  In the technique described in Patent Document 1, it is necessary to accurately process a support pin, a protrusion or a receiving seat provided on the upper surface of the foot portion of the boom, a pin receiving seat of the foot bracket on the revolving structure, and the like. It takes time to manufacture the swivel body, and the manufacturing cost of the crane increases.

  The boom mounting device according to claim 1 is a boom mounting device for mounting a boom to a main frame of a crane, and includes a pair of left and right lifting devices that support the boom in suspension and a support base that supports the pair of lifting devices. And the left and right inclinations of the boom are adjusted by independently operating each of the pair of lifting devices.

  According to the present invention, the manufacturing cost of a crane can be reduced.

Side view of the crane. The perspective view of a crane in the state where the boom was removed. The perspective view which shows the trailer with which the boom was loaded. The figure which shows the base end vicinity of a base boom. The perspective view of a boom attachment apparatus. The figure explaining the attachment part of the support stand in a main frame, and the attachment part of the chain block in a boom. The figure which looked at the boom mounting apparatus from the right side of the crane. The figure which looked at the boom mounting apparatus from the front side of the crane. The disassembled perspective view which shows each component which comprises a boom attachment apparatus. The figure explaining the assembly operation | work of a crane main body and a boom. The figure explaining the assembly operation | work of a crane main body and a boom.

Hereinafter, an embodiment of a crane including a boom mounting device according to the present invention will be described with reference to the drawings.
FIG. 1 is a side view of the crane, and FIG. 2 is a perspective view of the crane 10 with the boom removed. FIG. 3 is a perspective view showing the trailer 90 on which the boom 4 is loaded. 2, illustration of the traveling body 1 and the cab (cab) is omitted for convenience of explanation, and illustration of the tractor head is omitted in FIG. In the following, as shown in the figure, the vertical and front-rear and left-right directions of the crane 10 are defined in the posture in which the boom 4 is laid down.

  As shown in FIG. 1, the crane 10 includes a crane body 11 and a boom 4 that is rotatably attached to the crane body 11. The crane main body 11 includes a traveling body 1 and a revolving body 3 that is turnably provided on an upper portion of the traveling body 1 via a swirling wheel. As shown in FIG. 2, the revolving structure 3 includes a main frame 3a, and a rectangular box-shaped building cover 80 is fixed to the main frame 3a. A plurality of winches (not shown) are mounted on the main frame 3a.

  The main frame 3a is provided with a pair of boom attachment portions 31 that pivotally support the boom 4 in a rotatable manner. Each boom attachment part 31 is a part which supports the foot pin 81, and the foot pin insertion hole 31a for inserting the foot pin 81 is provided in each boom attachment part 31 so that it may extend in the left-right direction. The foot pin 81 is a shaft-like member for pivotally supporting the boom 4 so as to be rotatable at the boom mounting portion 31 of the main frame 3a. A boom cylinder 7 for raising and lowering the boom 4 is attached to the main frame 3a.

  As shown in FIG. 3, the boom 4 is a multistage boom, that is, a telescopic boom that can be expanded and contracted. The boom 4 is a multi-stage boom having at least two stages of a boom on the proximal end side and a boom on the distal end side that can be expanded and contracted with respect to the boom on the proximal end side. The boom 4 is a boom on the base end side of the multistage boom, and is a base boom 41 on the base end which is an outermost outer cylinder, and can extend and contract in the length direction on the inner peripheral side of the base boom 41 (moving) And a plurality of stages of inner cylinders 45 accommodated. At the base end of the base boom 41, a foot pin insertion hole 41a for inserting the foot pin 81 is provided so as to extend in the left-right direction. When the foot pin 81 is inserted into the foot pin insertion hole 31a (see FIG. 2) of the boom mounting portion 31 and the foot pin insertion hole 41a (see FIG. 3) of the base boom 41, as shown in FIG. The boom 4 is attached to 3a so that it can be raised and lowered with the foot pin 81 as a fulcrum.

  A cylinder rod attachment portion 42 to which a tip 72 (see FIG. 2) of the cylinder rod of the boom cylinder 7 is attached is provided on the abdominal surface of the base boom 41, that is, the surface of the base boom 41 that is lying down and facing the ground. Yes. The cylinder rod mounting portion 42 is provided with a cylinder pin insertion hole 42a for inserting a cylinder pin.

  As shown in FIG. 2, a cylinder pin insertion hole 72 a for inserting a cylinder pin is provided at the tip 72 of the cylinder rod of the boom cylinder 7. The cylinder pin is a shaft-like member for connecting the cylinder rod mounting portion 42 and the tip 72 of the cylinder rod of the boom cylinder 7 and is inserted into the cylinder pin insertion hole 42a and the cylinder pin insertion hole 72a.

  As shown in FIG. 3, sheaves 47 and 48 around which a hoisting rope (not shown) is wound are provided on the boom head 46 which is the distal end portion of the inner cylinder 45 located on the most distal side among the plurality of stages of inner cylinders 45. Is provided. The sheave 47 is pivotally supported on the boom head 46 by a shaft 83, and the sheave 48 is pivotally supported on the boom head 46 by a shaft 84. The sheave 47 on the abdominal surface side of the boom head 46, that is, the shaft 83 that pivotally supports the sheave 47 close to the ground when the boom 4 is laid down, has both ends projecting from the side surface of the boom head 46. The shaft 83 is supported so as to be rotatable with respect to the boom head 46.

  A pair of suspension brackets 141 are provided at both left and right end portions of the base end portion of the boom 4. The suspension bracket 141 includes a fixing portion that is fixed to the base end portion of the boom 4 and a triangular protruding portion that protrudes upward from the upper surface (back surface) of the boom 4. The projecting portion has a flat plate shape, and a bolt insertion hole 141a through which a bolt (see FIG. 5) of a shackle 59 attached to a lower hook 50d of the chain block 50 described later is provided in the vicinity of the top portion.

  FIG. 4 is a view showing the vicinity of the base end of the base boom 41. 4A is a cross-sectional view of the base boom 41 in the vicinity of the base end as viewed from the base end side, and FIG. 4B is a view of the base boom 41 in the vicinity of the base end as viewed from the side. FIG. 4 shows a state in which the boom 4 is laid down so that the extending direction of the boom 4 is horizontal, as in the posture of FIG.

  The boom 4 is provided with a hydraulic cylinder 60 for extending and retracting the inner cylinder 45 positioned closest to the base end relative to the base boom 41, and hydraulic cylinders 61 and 62 for extending and contracting adjacent inner cylinders 45 to each other. It has been. The hydraulic cylinders 60 to 62 are supplied with pressure oil from the crane body 11 via hydraulic hoses (not shown) in order to extend and contract the boom 4. A connection part 66 of a hydraulic hose (not shown) is provided in the vicinity of the base end of the base boom 41, and the crane body 11 is connected to the crane body 11 via a hydraulic hose (not shown) connected to the connection part 66 during crane work. Pressure oil is supplied from a hydraulic source.

  In the boom 4 of the present embodiment, as will be described later, the base boom 41 is expanded and contracted when the crane body 11 and the boom 4 are disassembled and assembled. At that time, pressure oil is supplied to the hydraulic cylinder 60 from a hydraulic source (not shown) of the crane body 11 via a hydraulic hose (not shown) dedicated to disassembly and assembly. Therefore, a connection portion 67 for connecting a hydraulic hose (not shown) dedicated to disassembly and assembly, which is different from the connection portion 66 described above, is provided in the vicinity of the base end of the base boom 41. The connecting portion 67 includes a connecting portion 67 a that supplies pressure oil for extending the hydraulic cylinder 60 and a connecting portion 67 b that supplies pressure oil for retracting the hydraulic cylinder 60.

  By the way, the crane 10 is disassembled into the crane main body 11 and the boom 4 due to restrictions on transportation weight, length, and the like, respectively transported separately, and assembled at the work site.

  As shown in FIG. 1, the trailer 90 is provided with a boom transport fixing device 100. The boom transport fixing device 100 includes a front boom transport base 101A, a rear boom transport base 101B, and a base connecting member 101C that connects the front boom transport base 101A and the rear boom transport base 101B. ing. The front boom transport base 101A is provided with a boom fixing part 110, and the rear boom transport base 101B is provided with a front boom slide part 120A and a rear boom slide part 120B. The front boom transportation platform 101A and the rear boom transportation platform 101B are respectively placed on a loading platform 91 of a trailer 90 and fixed to the loading platform 91 by, for example, a wire rope.

  As shown in FIG. 3, the boom fixing portion 110 is a fixing portion for fixing the boom head 46 to the front boom transport base 101 </ b> A, and includes a pair of left and right shaft support portions 111 and a pair of left and right shaft support portions 111. A shaft fixing link 112 to which each is attached is provided. The pair of left and right shaft support portions 111 are disposed so as to be located on the outer side of the boom 4 in the width direction of the boom 10 which is the extending direction of the shaft 83 of the boom head 46, that is, the left and right direction of the crane 10.

  A shaft receiving recess is formed at the upper end of the shaft support 111 so that the shaft 83 protruding from the side of the boom head 46 is received and supported from below so as to be lowered in the vicinity of the center in the front-rear direction. Insertion holes through which the fixing pins 113 are inserted are provided in the side plates on both the front and rear sides constituting the front and rear side surfaces of the shaft receiving recess of the shaft support 111. When the fixing pin 113 is inserted into the insertion hole, the shaft fixing link 112 is fixed to the shaft support portion 111 by the fixing pin 113.

  The shaft fixing link 112 is a plate-like member that is attached to the upper portion of the shaft support portion 111 and sandwiches the shaft 83 with the shaft receiving recess of the shaft support portion 111. The lower end of the shaft fixing link 112 is configured to come into contact with the shaft 83 supported by the shaft receiving recess of the shaft support 111 from above. Insertion holes through which the above-described fixing pins 113 are inserted are provided at both front and rear end portions of the shaft fixing link 112.

  In the boom fixing portion 110, when the shaft fixing link 112 is fixed to the upper portion of the shaft support portion 111 by the fixing pin 113, the shaft 83 is held between the shaft receiving recess of the shaft support portion 111 and the shaft fixing link 112, The boom head 46 is fixed.

  Since the shaft 83 is rotatably supported with respect to the boom head 46, the boom head 46 is fixed even if the shaft 83 is fixed by the shaft receiving recess of the shaft support 111 and the shaft fixing link 112. It can be rotated around the shaft 83. That is, even if the shaft 83 of the boom head 46 is fixed by the boom fixing unit 110, the base boom 41 is allowed to swing around the shaft 83.

  The front boom slide part 120A and the rear boom slide part 120B are spaced apart in the front-rear direction on the rear boom transport base 101B.

  The front boom slide portion 120A and the rear boom slide portion 120B have the same structure and are each provided with a slide roller 127. The slide roller 127 supports the boom 4 so as to be slidable in the front-rear direction by contacting the abdominal surface of the base boom 41. It should be noted that the front boom slide portion 120A and the rear boom slide portion 120B are arranged in the front-rear direction so that interference with the components of the boom 4 can be appropriately avoided when the boom 4 is expanded and contracted on the slide roller 127. The frame on the slide roller side (upper side) rotates with respect to the frame on the gantry side (lower side) and opens to the left and right outside using a pin 125 disposed so as to extend to the rotation fulcrum. ing.

  The boom attachment device 5 will be described with reference to FIGS. FIG. 5 is a perspective view of the boom mounting device 5. FIG. 6 is a diagram in which the support base 51 and the chain block 50 are not shown in FIG. 5, and is a diagram for explaining the attachment portion of the support base 51 in the main frame 3 a and the attachment portion of the chain block 50 in the boom 4. . 7 is a view of the boom mounting device 5 as viewed from the right side of the crane 10, and FIG. 8 is a view of the boom mounting device 5 as viewed from the front side of the crane 10. FIG. 9 is an exploded perspective view showing each component constituting the boom mounting device 5. In addition, each component which comprises the boom attachment apparatus 5 is formed so that it may be less than 20 kg.

  As shown in FIG. 5, a boom attachment device 5 for attaching the boom 4 to the main frame 3a is attached to the main frame 3a. The boom mounting device 5 includes a pair of left and right chain blocks 50L and 50R that suspend and support the boom 4, and a support base 51 that supports the pair of chain blocks 50L and 50R. The pair of chain blocks 50L and 50R can be operated independently. Hereinafter, the boom mounting device 5 will be described in detail.

  The chain block 50L and the chain block 50R have the same configuration, and are hereinafter collectively referred to as the chain block 50. The chain block 50 is a well-known suspension type provided with an upper hook 50a for attachment to the support base 51, a main body 50b, a load chain (not shown), a lower hook 50d, and a hand chain (not shown). It is a chain block. The main body 50b is provided with a load sheave (also referred to as a road wheel) and a hand chain wheel (also referred to as a hand wheel) on the same axis.

  The support base 51 includes two support columns 152 that are open in an inverted V shape on each of the left and right sides. The two support columns 152 that are open in an inverted V shape are connected to each other at the upper end portion by a support bracket 151.

  As shown in FIG. 9, the support bracket 151 is a triangular flat plate-like member in a side view. The support bracket 151 is formed with a U-shaped recess 151c at the center in the front-rear direction. The support bracket 151 is provided with a pin insertion hole 151h through which the connecting pin 155 is inserted at a predetermined interval X1 on both front and rear sides of the recess 151c.

  As shown in FIG. 5, the lower ends of the two columns 152 fixed by one support bracket 151 are fixed to the support base bracket 135. As shown in FIG. 6, the support bracket 135 is an inverted U-shaped flat plate member when viewed from the side, and includes a horizontal portion 135 a extending in the front-rear horizontal direction and both front and rear end portions of the horizontal portion 135 a. And a mounting portion 135b extending downward. The support bracket 135 has a mounting portion 135b welded to the upper end surface of the boom mounting portion 31 of the main frame 3a. The horizontal portion 135a is provided with a pin insertion hole 135h through which the connecting pin 156 (see FIGS. 5 and 9) is inserted with a predetermined interval X2 on both the front and rear sides.

  As shown in FIG. 5, the pair of left and right columns 152 arranged on the rear side among the four columns 152 are connected by two support pipes 153 and diagonal members 154. As shown in FIG. 9, one of the two support pipes 153 is welded in the vicinity of the upper end of each of the pair of left and right columns 152, and the other of the two support pipes 153 is a pair of left and right columns. Each of 152 is welded in the vicinity of the lower end. The two support pipes 153 are arranged in parallel to the central axis direction of the foot pin 81, that is, the width direction of the boom 4.

  One end of the diagonal member 154 is welded to the vicinity of the upper end portion of the support column 152 disposed on the right side, and the other end is welded to the vicinity of the lower end portion of the support column 152 disposed on the left side. When the pair of left and right support columns 152 on the rear side are connected by the support pipe 153 and the diagonal member 154, a welded structure in which the components are integrated is formed. This welded structure is one component constituting the boom mounting device 5 and has a mass of less than 20 kg as described above.

  As shown in FIG. 9, a bifurcated connecting portion having a bifurcated connecting plate is provided at both ends of the support column 152. A support bracket 151 is inserted into a bifurcated connecting portion (hereinafter referred to as an upper bifurcated connecting portion 152U) provided at the upper end of the support column 152. A support base bracket 135 (see FIGS. 5 and 6) is inserted into a bifurcated connecting portion (hereinafter referred to as a lower bifurcated connecting portion 152L) provided at the lower end of the support column 152.

  The upper bifurcated connecting portion 152U is provided with a circular pin insertion hole 152h through which the connecting pin 155 is inserted. The lower bifurcated connecting portion 152L is provided with a circular pin insertion hole 152h through which the connecting pin 156 is inserted.

  By inserting the connecting pin 155 into the pin insertion hole 152h of the upper bifurcated connection portion 152U and the pin insertion hole 151h of the support bracket 151, the upper bifurcated connection portion 152U and the support bracket 151 are connected. The connection pin 155 is provided with an end plate having a diameter larger than that of the pin insertion holes 151h and 152h at one end and a through hole through which a stop pin such as a pine needle pin is inserted at the other end.

  By inserting the connecting pin 156 into the pin insertion hole 152h of the lower bifurcated connection portion 152L and the pin insertion hole 135h of the support bracket 135, the lower bifurcated connection portion 152L and the support bracket 135 are coupled. The connection pin 156 is provided with an end plate having a diameter larger than that of the pin insertion holes 135h and 152h at one end and a through hole through which a stop pin such as a pine needle pin is inserted at the other end.

  The bar 150 is a columnar bar-shaped member. At both ends of the cylindrical portion 150a of the bar 150, an annular drop-off preventing plate 150c having a diameter longer than the front-rear width dimension of the recess 151c is disposed. An annular positioning plate 150d having a diameter larger than that of the columnar portion 150a of the bar 150 is provided at a position away from the dropout prevention plate 150c by a predetermined distance. As shown in FIG. 8, the dimension Y1 between the left side surface of the left positioning plate 150d and the right side surface of the right positioning plate 150d is substantially the same as the left and right width dimension Y2 of the base end portion of the boom 4. (Y1≈Y2).

  As shown in FIG. 5, when the bar 150 is placed in the recesses 151c (see FIG. 9) of the left and right support brackets 151, the bar 150 is suspended horizontally by the pair of left and right support brackets 151. The bar 150 is arranged so as to be parallel to the central axis direction of the foot pin 81.

  As shown in FIG. 7, the interval X2 that is the inter-pin distance of the connecting pins 156 is set larger than the interval X1 that is the inter-pin distance of the connecting pins 155, and the trapezoidal columnar shape is formed by the four columns 152. An arrangement space is defined. The interval X1 and the interval X2 prevent the support pipe 153 and the diagonal member 154 from interfering with the rear surface of the main body 50b of the pair of chain blocks 50R, 50L when the pair of chain blocks 50R, 50L are arranged in this arrangement space. Is set to be.

  As shown in FIG. 8, the right chain block 50R is disposed such that the upper hook 50a contacts the right side surface of the right positioning plate 150d. The left chain block 50L is arranged such that the upper hook 50a contacts the left side surface of the left positioning plate 150d. Thereby, the point P1 which supports the upper hook 50a of the chain block 50 in the bar 150 and the point P2 where the shackle 59 attached to the chain block 50 supports the suspension bracket 141 can be positioned on the vertical line. Thereby, compared with the case where the point P1 and the point P2 cannot be positioned on the vertical line, the load acting on the chain block 50 can be reduced, so that the chain block 50 and the support base 51 can have a simple structure. can do. As a result, the manufacturing cost of the boom attachment device 5 can be reduced.

  The crane body 11 and the boom 4 that are separately transported to the work site are assembled as follows. In the following description, an operation of attaching the boom 4 to the crane body 11 among the assembly operations of the crane 10 will be described. FIG. 10 and FIG. 11 are diagrams for explaining the assembly operation of the crane body 11 and the boom 4. In FIGS. 10 and 11, the traveling body 1, the cab, and the tractor head are not shown for convenience of explanation.

  The boom attachment device 5 is attached to the main frame 3a in advance. Since each component constituting the boom mounting device 5 has a mass of less than 20 kg, the operator can easily carry each component on the revolving unit 3 and the operator can hold the jig. Assembly work can be done without using it.

  As shown in FIG. 10, the crane body 11 and the boom 4 are arranged in a straight line with the front portion of the crane body 11 and the rear portion of the trailer 90 loaded with the boom 4 facing each other. After arranging the crane body 11 and the trailer 90 as described above, a hydraulic pressure source (not shown) provided in the crane body 11 and a connecting portion 67 (see FIG. 4) of the hydraulic cylinder 60 in the base boom 41 are provided. Connect with a hydraulic hose (not shown) dedicated to disassembly and assembly.

  As shown in FIGS. 10 and 11, the base boom 41 is supported by the front boom slide part 120A or the rear boom slide part 120B. When pressure oil from a hydraulic power source (not shown) of the crane body 11 is supplied to the hydraulic cylinder 60 mounted in the boom 4, the base boom 41 is moved by the slide roller 127 of the front boom slide portion 120A or the rear boom slide portion 120B. It extends toward the crane body 11 while being guided.

  As shown in FIG. 11, the boom 4 is extended by a predetermined amount, and the foot pin insertion hole 41 a (see FIG. 2) of the base boom 41 and the foot pin insertion hole 31 a (see FIG. 3) of the boom attachment portion 31 are brought close to each other. The positioning of the foot pin insertion hole 41a of the base boom 41 and the foot pin insertion hole 31a of the boom mounting portion 31 is performed according to the following procedures (1) to (procedure 3).

(Procedure 1) As shown in FIG. 5, the shackle 59 is attached to the suspension bracket 141 of the base boom 41.
(Procedure 2) The shackle 59 is attached to the lower hook 50d of the chain block 50, and the boom 4 is suspended by the chain block 50 by pulling the hand chain (chain).
(Procedure 3) The left and right chain blocks 50L and 50R are individually operated to adjust the left and right heights of the boom 4. In other words, the left and right inclinations of the boom 4 are adjusted to align the positions of the foot pin insertion hole 41a (see FIG. 3) and the foot pin insertion hole 31a (see FIG. 2).

  When the alignment between the foot pin insertion hole 41a and the foot pin insertion hole 31a is completed, the foot pin 81 is inserted into the foot pin insertion hole 41a and the foot pin insertion hole 31a with a jig (not shown). Thereby, the boom 4 is pivotally supported by the revolving structure 3 so that rotation is possible.

  As shown in FIG. 11, the boom cylinder 7 is swung by a jack (not shown), and the cylinder rod of the boom cylinder 7 is expanded and contracted, whereby the cylinder pin insertion hole 42 a of the cylinder rod mounting portion 42 and the boom cylinder 7. The cylinder rod end 72 is aligned with the cylinder pin insertion hole 72a. When the alignment between the cylinder pin insertion hole 42a and the cylinder pin insertion hole 72a is completed, a cylinder pin (not shown) is inserted and the boom cylinder 7 is attached to the boom 4.

  A hydraulic hose (not shown) dedicated for disassembly and assembly is removed from the connecting portion 67 of the hydraulic cylinder 60 in the base boom 41. In order to extend the boom 4 during crane operation, a hydraulic hose (not shown) is connected to a hydraulic power source (not shown) of the crane body 11 and a connecting portion 66 (see FIG. 4) of the hydraulic cylinders 60 to 62 in the base boom 41. Connecting.

  The lower hook 50 d of the chain block 50 shown in FIG. 5 is removed from the shackle 59, and the shackle 59 is removed from the suspension bracket 141 of the base boom 41. The boom mounting device 5 is disassembled, and the boom mounting device 5 is removed from the main frame 3a. Since each component constituting the boom mounting device 5 has a mass of less than 20 kg, the operator can perform the disassembly work without using a jig. You can easily take it down from 3 to the ground.

  The restraint of the boom head 46 by the boom fixing part 110 shown in FIG. 11 is released, and the attachment of the boom 4 to the crane body 11 is completed.

  In addition, when removing the boom 4 from the crane main body 11, the work procedure becomes a reverse procedure of the work procedure in the attachment of the boom 4 to the crane main body 11 mentioned above. Therefore, detailed description of the procedure for removing the boom 4 from the crane body 11 is omitted.

According to the embodiment described above, the following operational effects can be obtained.
(1) In the present embodiment, the boom mounting device 5 that attaches the boom 4 to the main frame 3a of the crane 10 includes a pair of left and right chain blocks 50R and 50L that suspend and support the boom 4, and a pair of chain blocks 50R and 50L. The left and right inclinations of the boom 4 are adjusted by operating each of the pair of chain blocks 50R and 50L independently. Thereby, even if it is a case where the crane 10 is not mounted on the flat ground, the boom 4 can be easily attached to the main frame 3a.

  When the boom 4 is suspended at four points by an auxiliary crane and the operator performs alignment on the base end side of the boom 4, it is difficult for the operator to tilt the boom 4 to the left and right to adjust the position. On the other hand, according to the present embodiment, the left and right inclinations of the boom 4 can be easily adjusted, so that the boom 4 can be attached to the main frame 3a more easily than when an auxiliary crane is used. .

(2) In the technique described in Patent Document 1, when the support pin attached to the boom is placed on the pin receiving seat of the foot bracket on the revolving structure, the foot pin becomes the boss hole of the foot bracket and the foot portion of the boom. It is comprised so that it can penetrate through the boss hole. The support pin is attached to a protrusion provided on the upper surface of the foot portion of the boom or a receiving seat provided on the upper surface of the foot portion of the boom. For this reason, it is necessary to precisely process the support pins, the protrusions or receiving seats provided on the upper surface of the foot part of the boom, the pin receiving seats of the foot bracket on the swivel body, etc. This increases the manufacturing cost of the crane.

  On the other hand, in the present embodiment, the foot block insertion holes are aligned by individually operating the chain blocks 50R and 50L and tilting the boom 4 supported to be suspended to the left and right. For this reason, a highly accurate structure (support pin or hole) described in Patent Document 1 for aligning the positions of the boss hole (foot pin insertion hole) of the foot bracket and the boss hole (foot pin insertion hole) of the foot part of the boom. , A receiving seat for receiving the support pin, and a mounting portion between the support pin and the boom are not required. As a result, in the present embodiment, the manufacturing cost of the crane 10 can be reduced.

(3) The operator can perform the positioning operation of the foot pin insertion hole 41a and the foot pin insertion hole 31a on the crane body 11. In contrast, when the crane body 11 is jacked up and the foot pin insertion hole 41a and the foot pin insertion hole 31a are aligned, it is necessary for the operator to get off the crane body 11 every time the jack is operated for safety. There was, and it took time and effort. According to the present embodiment, it is possible to easily attach the boom 4 to the main frame 3a as compared with the case where a jack is used.

(4) The support base 51 includes four bars 150 to which the chain block 50 is attached, a pair of left and right support brackets 151 that support the left and right ends of the bar 150, and a pair of left and right support brackets 151. , And support pipes 153 and diagonal members 154 that connect the left and right columns 152 to each other. The support bracket 151 is attached with support columns 152 at predetermined intervals X1 on both front and rear sides of the recess 151c on which the bar 150 is placed. The predetermined interval X1 is such that the support pipe 153 and the diagonal member 154 interfere with the chain block 50 when the pair of chain blocks 50R and 50L are arranged in the trapezoidal columnar arrangement space defined by the four columns 152. It is set to prevent it. Thereby, the alignment workability | operativity of the boom 4 by the chain block 50 improves.

The following modifications are also within the scope of the present invention, and one or a plurality of modifications can be combined with the above-described embodiment.
(Modification 1)
In the above-described embodiment, the example in which the chain block 50 is employed as the lifting device has been described, but the present invention is not limited to this. Instead of the chain block 50, a lever block (registered trademark) may be adopted. Instead of the manual chain block 50, an electric chain block using an electric motor as a drive source may be employed as the lifting device. Instead of the chain block 50, a lifting device using a linearly operable actuator such as a hydraulic cylinder or a lifting device such as a hoist that winds a wire rope with a winch may be employed. When a hydraulic cylinder is used, the rod end of the hydraulic cylinder is attached to the bar 150 via a spherical bush.

(Modification 2)
In the embodiment described above, as the support base 51, two support columns on the left and right are arranged in an inverted V shape, and are placed on the support bracket 151 that connects the two inverted V-shaped support columns 152. Although the chain block 50 is suspended and supported by the bar 150, the present invention is not limited to this. Any configuration may be used as long as the boom 4 can be held when the chain block 50 in which the boom 4 is supported by being suspended is operated.

(Modification 3)
In the above-described embodiment, the boom head 46 is fixed, the boom 4 is extended, the base boom 41 is moved, and the boom 4 is attached to the main frame 3a. However, the present invention is not limited to this. For example, the boom 4 is lifted using an auxiliary crane, and the base end side of the boom 4 is suspended and supported by the boom mounting device 5, and the positions of the foot pin insertion hole 41 a of the base boom 41 and the foot pin insertion hole 31 a of the boom mounting part 31 are You may combine.

  As long as the characteristics of the present invention are not impaired, the present invention is not limited to the above-described embodiments, and other forms conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention. .

1 traveling body, 3 revolving body, 3a main frame, 4 boom, 5 boom mounting device, 10 crane, 31 boom mounting section (pin support section), 31a foot pin insertion hole, 41 base boom, 41a foot pin insertion hole, 50 chain block (Elevating device), 50a upper hook, 50b main body, 50d lower hook, 51 support base, 81 foot pin, 135 support base bracket, 135a horizontal part, 135b mounting part, 135h pin insertion hole, 141 suspension bracket, 141a bolt insertion hole , 150 bar, 150c drop-off prevention plate, 150d positioning plate, 151 support bracket, 151c recess, 151h pin insertion hole, 152 column, 152L lower bifurcated connection portion, 152U upper bifurcated connection portion, 152h pin insertion hole, 153 support pipe ( Linking Materials), 154 diagonal members (connecting members) 155 connecting pin 156 connecting pin

Claims (4)

A boom attachment device for attaching a boom to a main frame of a crane,
A pair of left and right lifting devices that suspend and support the boom;
A support base for supporting the pair of lifting devices,
A boom mounting device in which the left and right inclinations of the boom are adjusted by operating each of the pair of lifting devices independently. The boom mounting device according to claim 1,
The pair of lifting devices is a boom mounting device that is a pair of chain blocks. The boom mounting device according to claim 1 or 2,
The support base includes a bar to which the lifting device is attached, a pair of left and right support brackets that support left and right ends of the bar, four struts that support the front and rear of the pair of left and right support brackets, and left and right A connecting member for connecting the columns of the
The support bracket is attached to the support columns at a predetermined interval on both front and rear sides of the recess where the bar is placed,
The predetermined interval is to prevent the connecting member from interfering with the lifting device when the pair of lifting devices are disposed in a trapezoidal columnar space defined by the four columns. Boom mounting device set to. The boom mounting device according to any one of claims 1 to 3,
A traveling body,
The main frame provided to be turnable on an upper portion of the traveling body;
The boom is attached to the main frame so that it can be raised and lowered with a foot pin as a fulcrum.
The main frame is provided with a pair of pin support portions for supporting the foot pins and a pair of support base brackets for fixing the support base,
The support base bracket is provided on an upper portion of the pin support portion,
A crane in which a lifting bracket to which a lifting device of the lifting device is attached is provided at each of both left and right end portions of the base end portion of the boom.

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