JP2015058991A - Mobile crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile crane configured so that a driver's cab can be lifted between a travelling position and an operating position, which secures safety of the driver cab by suppressing rolling of the driver's cab during travelling.SOLUTION: A mobile crane comprises: a turning base portion 6 that is mounted turnably on a lower travelling body 2; a driver's cab 10 for an operator to perform operation for travelling the crane and operation of a working device 8 for crane work; and a lifting device 13 that lifts the driver's cab between a travelling position P1 and a working position P2 above the travelling position P1. In the driver's cab 10 is provided a protruding portion 12, and in a lifting device-supporting portion 18 of the turning base portion 6 is provided a regulating portion 46 that engages with the protruding portion 12 so as to regulate lateral displacement of the protruding portion 12 when the driver's cab 10 is arranged at the travelling position P1.

Description

  The present invention relates to a mobile crane.

  Conventionally, in a working machine such as a mobile crane, it is configured so that the position of the cab can be changed in the vertical direction between running and working, and the cab is placed at a relatively low running position during running. It is known that an operator can easily perform driving, and the operator's cab is arranged at a relatively high work position during work so that the field of view from the operator's cab can be expanded. Patent Document 1 below discloses an example of such a working machine.

  In the work machine disclosed in Patent Document 1 below, a lifting device that lifts and lowers the cab between the traveling position and the working position is provided. The lifting device is a link that connects the cab to a support frame provided on the frame of the upper swing body so that the cab can be displaced between the traveling position and the working position, and an actuator that raises and lowers the cab And a hydraulic cylinder. The hydraulic cylinder elongates to push up the cab, thereby raising the cab to the working position while being supported by the link. On the other hand, when the hydraulic cylinder contracts, the cab is lowered from the working position to the traveling position while being supported by the link.

JP 2013-14914 A

  There is rattling between components of the lifting device that lifts and lowers the cab, between the lifting device and the cab, and between the lifting device and the support frame of the upper swing body. For this reason, there is a risk that the driver's cab may sway (sway the driver's cab in the left-right direction) when vibration occurs in the aircraft during travel.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a mobile crane configured so that the cab can be moved up and down between the traveling position and the working position. The stability of the cab is ensured by suppressing the rolling of the cab.

  In order to achieve the above object, a mobile crane according to the present invention is a mobile crane configured to be capable of traveling, and a lower traveling body and a turn mounted on the lower traveling body so as to be rotatable. A base, a working device provided on the swivel base, for carrying out crane work, an operator's cab for operating the mobile crane and operating the working device for crane work, A position that is provided at the turning base and that is a predetermined height position at which the cab is disposed when the mobile crane is traveling, and a position that is above the traveling position and that is disposed at the time of crane operation. A lifting device that lifts and lowers between the working position and the operating position, wherein the driver's cab is provided with an engaging portion, and the swivel base has a front when the driver's cab is disposed at the traveling position. Engaged portion to be engaged with the engaging portion so as to restrict the displacement of the engaging portion in the lateral direction of the mobile crane is provided (claim 1).

  In this mobile crane, when the cab is arranged at the travel position, the engaging portion provided in the cab engages with the engaged portion provided in the turning base, and the left and right directions of the engaging portion Therefore, the displacement of the cab in the left-right direction is restricted. For this reason, even when vibration or the like occurs in the airframe during traveling of the mobile crane, it is possible to suppress the lateral swaying of the cab, and as a result, it is possible to ensure the stability of the cab.

  In the mobile crane, the elevating device connects the cab to the turning base so that the cab can move between the travel position and the work position, and the cab is the travel A link that supports the cab so as to reach the travel position by moving backward while moving down to a position, and one member of the engaging portion and the engaged portion is: , A projection that protrudes from one of the cab and the swivel base provided with the one member to the other side, and the other member of the engagement portion and the engaged portion is In the other of the cab and the swivel base provided with the other member, the left restricting portion disposed at a position facing the left side surface of the protrusion when the cab is disposed at the traveling position. And the other member is provided The other of the cab and the swivel base has a right restricting portion disposed at a position facing the right side surface of the projection when the cab is disposed at the travel position, and the left Between the restricting portion and the right restricting portion, an end located on the one side of the driver's cab and the turning base provided with the protrusion is opened, and the operation is started from the opened end. It is preferable that a space for receiving the protrusion when the chamber moves to the travel position is formed.

  According to this configuration, in the mobile crane that is supported by the link so as to reach the travel position by moving backward while moving down from the work position to the travel position, the cab is engaged with the engagement portion. The protrusion as one member of the engaging portion is moved into the space between the left restricting portion and the right restricting portion of the other member of the engaging portion and the engaged portion by using the movement of the cab. The engaging portion and the engaged portion can be engaged with each other so that the displacement of the engaging portion in the left-right direction is regulated. For this reason, after the cab reaches the traveling position, the mobile crane is configured to manually engage the engaged portion with the engaged portion to restrict the displacement of the engaging portion in the left-right direction. In comparison, the work load can be reduced.

  In this case, the right side surface of the left restricting portion and the left side surface of the right restricting portion respectively have end portions located on the one side of the cab and the turning base portion, and the end portions are It is preferable to incline so that it may go to the direction which leaves | separates mutually as it goes to one side.

  According to this configuration, when the cab moves from the work position to the travel position, the protrusion is easily introduced into the space between the left restricting portion and the right restricting portion.

  In the configuration in which the engaged portion includes a left restricting portion and a right restricting portion, the engaged portion is capable of moving back and forth from the left restricting portion to the protruding portion side in the left-right direction and the left side surface of the protruding portion. A left restricting position adjusting portion provided in the left restricting portion so that the position can be fixed in that state when abutting on the left restricting portion, and capable of moving forward and backward from the right restricting portion to the protruding portion in the left-right direction, and It is preferable to have a right restricting position adjusting portion provided in the right restricting portion so that the position can be fixed in that state when contacting the right side surface of the protrusion.

  In this configuration, when the cab is disposed at the traveling position and the protrusion is inserted between the left restricting portion and the right restricting portion, between the left side surface of the protrusion and the left restricting portion and the right side of the protrusion. When a gap is formed between the surface and the right restricting portion, the left restricting position adjusting portion is advanced from the left restricting portion to a position where it abuts on the left side surface of the protrusion, and is fixed at that position. By moving the adjustment portion from the right restricting portion to a position where it abuts on the right side surface of the protruding portion and fixing at that position, the protruding portion and the left and right restricting portions are relatively moved due to the gaps on the left and right sides of the protruding portion. Therefore, it is possible to fix the relative positions of the protrusions in the left and right direction and the right and left restricting parts so that they do not rattle from side to side. Therefore, according to this configuration, when the cab is disposed at the traveling position and the protrusion is inserted into the space between the left restriction portion and the right restriction portion, the left side surface of the protrusion and the left restriction portion Even when a gap is formed between the right side surface of the projection and the right restricting portion, the rolling of the cab can be reliably prevented.

  In the configuration in which one member of the engaging portion and the engaged portion is a protruding portion, the protruding portion is provided in the cab so as to protrude rearward from the cab, and the engaged portion Is provided on the lower side of the front end portion of the swivel base, and the upper end edge of the rear end portion of the projecting portion is preferably inclined so that the height position decreases toward the rear side. 5).

  According to this configuration, when the cab moves to the traveling position and the protrusions sink into the lower side of the front end of the turning base and engage with the engaged parts, the upper end of the rear end of the protrusions Can be prevented from interfering with the front end of the swivel base.

  In the above-mentioned mobile crane, a lock device that restrains the engagement portion so that the engagement portion is engaged with the engaged portion when the cab is arranged at the travel position. Furthermore, it is preferable to provide (Claim 6).

  According to this configuration, when the cab is arranged at the travel position, the engaging portion can be restrained while being engaged with the engaged portion, and the cab can be prevented from being lifted from the travel position. For this reason, for example, even when a sudden brake is applied during traveling of the mobile crane, it is possible to prevent the cab from being lifted from the traveling position and to ensure the stability of the cab.

  In this case, the engaging portion is provided with an engaging portion pin hole whose axial direction is the left-right direction, and when the cab of the engaged portion is disposed at the traveling position, An engaged portion pin hole whose axial direction is the left-right direction is provided at a position corresponding to the position where the engaging portion pin hole is disposed, and the locking device is disposed to extend in the left-right direction. The lock pin, and the lock pin is moved between a lock position where the lock pin is inserted into the engagement part pin hole and the engaged part pin hole and a lock release position where the lock pin is detached from the engagement part pin hole. It is preferable to have a pin drive device that moves the lock pin in the left-right direction.

  According to this configuration, the pin driving device can restrain the engaging portion in the engaged state with the engaged portion by moving the lock pin to the locked position, while the pin driving device locks the lock pin to the unlocked position. By moving to the engagement portion, the engagement portion can be separated from the engaged portion restricting portion. Therefore, in this configuration, no manual work is required to switch between the state in which the engaging portion is restrained while being engaged with the engaged portion and the state in which the engaging portion can be detached from the engaged portion. For this reason, a work burden can be reduced.

  As described above, according to the present invention, in the mobile crane configured so that the cab can be moved up and down between the travel position and the work position, the roll of the cab during travel is suppressed. The stability of the cab can be ensured.

It is a side view which shows the state at the time of driving | running | working of the mobile crane by one Embodiment of this invention. It is a side view which shows the state at the time of the crane operation | work of the mobile crane by one Embodiment of this invention. It is a figure which shows the state in which a driver's cab is in a driving | running | working position, and the state in a working position. The front end portion of the turning base, the rear end portion of the base frame of the driver's cab, the displacement regulating device, the locking device, and the projecting portion when the cab is disposed at the traveling position and the projecting portion is engaged with the regulating portion are viewed from below. FIG. In the process of lowering the cab from the working position to the traveling position, the front end of the bottom of the turning base and the rear of the cab of the cab in the state immediately before the protrusion is inserted between the left restricting portion and the right restricting portion. It is a figure which shows the area | region of the vicinity of an edge part partially. FIG. 6 is a diagram illustrating a state in which the cab moves from the state of FIG. 5 to the traveling position side and the rear end portion of the protrusion is inserted between the left restriction plate and the right restriction plate. FIG. 7 is a diagram illustrating a state where the cab is further moved from the state of FIG. 6 and is disposed at the traveling position, and the protruding portion reaches a position where the protruding portion pin hole and the restricting portion pin hole are aligned.

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

  With reference to FIGS. 1-7, the structure of the mobile crane (henceforth a crane) which can be self-propelled by one Embodiment of this invention is demonstrated. In the following description, “front” means forward when the crane is traveling normally (forward), and “rear” means a direction opposite to the front. “Left” means leftward in the forward direction of the crane, and “right” means rightward in the forward direction of the crane.

  The crane by this embodiment is provided with the lower traveling body 2 and the upper turning body 4 as shown in FIG.

  The lower traveling body 2 is a self-propelled type, and is a wheel-type traveling body in the present embodiment.

  The upper turning body 4 is mounted on the lower traveling body 2 so as to be turnable. The upper turning body 4 includes a turning base 6, a working device 8, a driver's cab 10, a protrusion 12 (see FIG. 3), an elevating device 13 (see FIG. 3), and a displacement regulating device 14 (see FIG. 4). And have.

  The turning base 6 is mounted on the lower traveling body 2 so as to be turnable around the vertical axis. The swivel base 6 includes an upper frame 16 that serves as a base of the upper swivel body 4 and a lifting device support 18 (see FIG. 3) that is located at the front end of the swivel base 6 and is fixed to the upper frame 16. . The upper frame 16 extends in the horizontal direction, and the lifting device support portion 18 is connected to the front end portion of the upper frame 16 and is erected so as to protrude above the upper surface of the upper frame 16. An abutted portion 6a (see FIG. 5) is provided on the front surface of the portion near the lower end of the lifting device support portion 18.

  The work device 8 (see FIG. 2) is a device for carrying a suspended work (crane work) and is installed on the upper frame 16. The working device 8 includes a boom 20 attached to the front end of the upper frame 16 at a position lateral to the lifting device support 18 so that the boom 20 can be raised, a hoisting device 22 for raising and lowering the boom 20, And a hook device 24 that is suspended from the tip via a suspension rope 23. The suspended load is suspended by the hook device 24, the hook device 24 is raised and lowered, and the boom 20 is raised and lowered by the raising and lowering device 22, whereby the crane work is performed.

  As shown in FIG. 3, the cab 10 has a cab body 26 and a base frame 28.

  Inside the cab body 26, there are provided a driving device including a handle used for operation for traveling the crane, various operation devices used for operating the work device 8 for crane work, and the like. Handle operation for traveling of the crane inside the room body 26 and various operations of the work device 8 for crane work (elevating operation of the hook device 24, operation of the hoisting device 22 for hoisting the boom 20, and upper turning) The turning operation of the body 4 is performed.

  The base frame 28 supports the cab main body 26 from below. That is, the cab main body 26 is placed and fixed on the base frame 28. A contact portion 28 a (see FIG. 5) is provided on the rear end surface of the base frame 28. The abutting portion 28a abuts against the abutted portion 16a at the front end of the turning base 6 when the cab 10 is disposed at a travel position P1 described later.

  The protruding portion 12 is fixed to the lowermost portion of the rear end portion of the base frame 28, and is an elongated box shape that protrudes from the rear end portion of the base frame 28 toward the rear of the cab 10, that is, toward the turning base portion 6. Is formed. This protrusion 12 is an example of the engaging portion of the present invention. As shown in FIG. 4, the protrusion 12 has a left side plate 32 and a right side plate 34.

  The left side plate 32 and the right side plate 34 are arranged perpendicular to the lower surface (bottom surface) of the base frame 28. The left side plate 32 and the right side plate 34 are arranged with a slight space between each other in the left-right direction except for their rear end edges. The left side plate 32 and the right side plate 34 extend parallel to each other from the front end to the rear side thereof, and extend obliquely so as to gradually approach each other in the left-right direction toward the rear at their rear end portions. The edges are in contact. Accordingly, the rear end portion of the protrusion 12 has a width in the left-right direction that is smaller than the width in the left-right direction of the front portion thereof, and the left-right direction of the rear end portion toward the rear end edge. The width of is gradually getting smaller. A protrusion pin hole 35 (see FIG. 5) that penetrates the right side plate 34 in the thickness direction (left and right direction) is provided at an intermediate portion in the front and rear direction of the right side plate 34. The protruding portion pin hole 35 is formed such that its axial direction is the left-right direction. The protruding portion pin hole 35 is an example of the engaging portion pin hole of the present invention. Further, as shown in FIG. 5, the upper end edge of the rear end portion of the projecting portion 12, that is, the upper end edge of the rear end portion of the left side plate 32 and the right side plate 34 gradually decreases in height toward the rear side. So as to be inclined.

  The elevating device 13 elevates and lowers the cab 10 between the traveling position P1 shown in FIG. 1 and the work position P2 shown in FIG. 2, and is provided at the front end portion of the turning base 6, that is, the elevating device support portion 18. ing. In FIG. 1, a state when the crane is traveling is shown, and in FIG. 2, a state when the crane is working is shown. The traveling position P <b> 1 is a position where the cab 10 is disposed when the crane is traveling, and is the lowest position in the movable range above and below the cab 10. In the traveling position P <b> 1, the height position of the lower surface of the cab 10 (the lower surface of the base frame 28) is disposed at a position close to the height position of the lower surface of the turning base 6. The work position P2 is a position where the cab 10 is arranged during crane work, and is a position above the travel position P1. The work position P <b> 2 is the uppermost position in the upper and lower movable ranges of the cab 10.

  The lifting device 13 includes two links 36 (see FIG. 3) and two drive mechanisms 38 (see FIG. 3). The two links 36 are arranged side by side in the vertical direction, and the cab 10 is moved to the lifting device support 18 of the turning base 6 so that the cab 10 can move between the travel position P1 and the work position P2. It is connected to. The two links 36 have a similar structure. Specifically, each link 36 divides and arranges two link arms 36a arranged at positions corresponding to the left and right sides of the cab 10 and connects the two link arms 36a to each other. Each has a not-illustrated frame. In FIG. 3, only the right link arm 36 a of the two link arms 36 a of each link 36 is shown. The two link arms 36a of each link 36 are connected and integrated with each other via a frame (not shown) so as to be parallel to each other while being separated from each other on the left and right.

  One end of each link arm 36a of each link 36 is attached to the upper portion of the lifting device support 18 via a corresponding link pin 40 extending in the left-right direction. One end of each link arm 36a is rotatable with respect to the lifting device support 18 with the corresponding link pin 40 as an axis. The other end of each link arm 36a is attached to the rear end of the base frame 28 of the cab 10 via a corresponding link pin 41 extending in the left-right direction. The other end of each link arm 36a is rotatable with respect to the base frame 28 of the cab 10 about the corresponding link pin 41 as an axis.

  The two links 36 are disposed in parallel to each other and are spaced apart from each other in the vertical direction. The two links 36 rotate around the corresponding link pin 40 at one end of the link arm 36a while maintaining a state parallel to each other, whereby the cab 10 is moved between the traveling position P1 and the working position P2. It is designed to go up and down. The driver's cab 10 moves up and down while rotating about the link pin 40 as an axis, but the other end of each link arm 36a rotates relative to the base frame 28 of the operator's cab 10 about the corresponding link pin 41 as an axis. As a result, the base frame 28 is kept horizontal. That is, the cab 10 is raised and lowered in a state where the horizontal posture is maintained. Further, the cab 10 is supported by each link 36 so as to reach the traveling position P1 by moving backward while moving down to the traveling position P1.

  The drive mechanism 38 operates the link 36 that supports the cab 10 so that the cab 10 moves up and down between the travel position P1 and the work position P2. The drive mechanism 38 includes two hydraulic cylinders 44. One of the two hydraulic cylinders 44 is provided at a position corresponding to the left link arm 36a, and the other is provided at a position corresponding to the right link arm 36a. In FIG. 3, only the hydraulic cylinder 44 provided on the right side of the two hydraulic cylinders 44 is shown. One end of the hydraulic cylinder 44 provided at a position corresponding to the left link arm 36a is laterally relative to the lifting device support 18 at a position between the one ends of the left link arms 36a of the two links 36. The other end of the hydraulic cylinder 44 is connected to an intermediate portion of the left link arm 36a of the upper link 36 around an axis extending in the left-right direction. It is connected so that it can rotate. Also, one end of the hydraulic cylinder 44 provided at a position corresponding to the right link arm 36a is located with respect to the lifting device support 18 at a position between the one ends of the right link arms 36a of the two links 36. The other end of the hydraulic cylinder 44 is connected to an intermediate portion of the right link arm 36a of the upper link 36 so as to be rotatable about an axis extending in the left / right direction. It is connected so that it can rotate around.

  In the drive mechanism 38, the two hydraulic cylinders 44 are extended so that the upper link 36 to which the hydraulic cylinders 44 are connected is rotated upward with the corresponding link pin 40 as an axis, whereby the cab 10 is operated. It raises to the position P2 side. Further, in the drive mechanism 38, the two hydraulic cylinders 44 are contracted, whereby the upper link 36 to which the hydraulic cylinders 44 are connected is rotated downward about the corresponding link pin 40 as an axis. Is lowered to the traveling position P1 side.

  The displacement regulating device 14 (see FIG. 4) is a device for regulating the displacement of the cab 10 when the cab 10 is disposed at the travel position P1. The displacement restricting device 14 includes a restricting device base 45, a restricting portion 46, and a lock device 48.

  The restricting device base 45 is a member serving as a base of the displacement restricting device 14 and is formed of a rectangular flat plate. The regulating device base 45 is fixed (fastened) in a removable state to the lower surface of the lifting device support 18. The restricting portion 46 and the lock device 48 are attached to the restricting device base 45, whereby the displacement restricting device 14 is unitized.

  The restricting portion 46 is engaged with the protruding portion 12 so as to restrict the displacement of the protruding portion 12 in the left-right direction when the cab 10 is disposed at the traveling position P1 (see FIG. 3). It is an example of a to-be-engaged part. The restricting portion 46 includes a left restricting plate 52, a right restricting plate 54, a pin guide portion 55, a left reinforcing rib 56, a right reinforcing rib 58, a left restricting position adjusting portion 60, and a right restricting position adjusting portion 62. Is provided.

  The left restriction plate 52 and the right restriction plate 54 are arranged in a posture perpendicular to the lower surface of the lifting device support portion 18, extend in the front-rear direction, and are fixed to the restriction device base 45. The left restricting plate 52 is an example of a left restricting portion of the present invention, and the right restricting plate 54 is an example of a right restricting portion of the present invention. The left regulating plate 52 is provided at a position facing the left side surface of the projection 12 and close to the left side of the projection 12 when the cab 10 is disposed at the travel position P1. The right regulating plate 54 is provided at a position facing the right side surface of the projection 12 and close to the right side of the projection 12 when the cab 10 is disposed at the travel position P1. That is, the left restricting plate 52 and the right restricting plate 54 are arranged with a space left and right, and a front end (end on the side of the cab 10) is provided between the left restricting plate 52 and the right restricting plate 54. Is opened, and a space for receiving the protrusion 12 is formed when the cab 10 moves from the opened front end to the traveling position P1.

  The front end portion 52a of the left restricting plate 52 and the front end portion 54a of the right restricting plate 54 extend obliquely so as to go away from each other toward the front side. In other words, the right side surface of the front end portion 52a of the left regulating plate 52 and the left side surface of the front end portion 54a of the right regulating plate 54 are inclined so as to go away from each other toward the front side. The width in the left-right direction of the space between the front end portion 52a of the restricting plate 52 and the front end portion 54a of the right restricting plate 54 increases as it goes to the front side. For this reason, the protrusion 12 provided in the cab 10 moving to the traveling position P1 side can be easily received from the front side in the space between the left regulating plate 52 and the right regulating plate 54. The left restriction plate main body portion 52b located on the rear side of the front end portion 52a in the left restriction plate 52 and the right restriction plate main body portion 54b located on the rear side of the front end portion 54a in the right restriction plate 54 are parallel to each other. And it extends in the front-rear direction. The width in the left-right direction of the space between the left restriction plate main body portion 52b and the right restriction plate main body portion 54b, that is, the right side surface (inner side surface) of the left restriction plate main body portion 52b and the left side surface of the right restriction plate main body portion 54b ( The distance between the inner surface and the inner surface is slightly larger than the width of the protrusion 12 in the left-right direction.

  The right restricting plate body 54b is provided with a restricting portion pin hole 54c (see FIG. 5) that penetrates the right restricting plate body 54b in the thickness direction. The restricting portion pin hole 54c is an example of the engaged portion pin hole of the present invention. The restricting portion pin hole 54c is formed such that its axial direction is the left-right direction. The restricting portion pin hole 54c is located at a position corresponding to the protruding portion pin hole 35 (a position concentric with the protruding portion pin hole 35) when the cab 10 is arranged at the travel position P1 in the right restricting plate main body portion 54b. Is provided.

  The pin guide part 55 (refer FIG. 4) guides the movement of the lock pin 64 mentioned later. The pin guide portion 55 is a cylindrical member, and is fixed to the right side surface (outer surface) of the right restriction plate main body portion 54b so as to be coaxial with the restriction portion pin hole 54c (see FIG. 5). The main body 54b extends rightward from the right side surface. A lock pin 64 (described later) is inserted into the pin guide portion 55, and the movement of the lock pin 64 in the left-right direction is guided by the pin guide portion 55.

  The left reinforcing rib 56 supports and reinforces the left restricting plate 52 from the left side so that the left restricting plate 52 does not fall down. The left reinforcing rib 56 is disposed perpendicular to the left restricting plate main body 52b and the restricting device base 45, and is fixed to a portion near the rear end of the left restricting plate main body 52b and the restricting device base 45. .

  The right reinforcing rib 58 supports and reinforces the right restricting plate 54 from the right side so that the right restricting plate 54 does not fall down. The right reinforcing rib 58 is disposed perpendicular to the right restricting plate main body portion 54b and the restricting device base portion 45, and is fixed to a portion near the rear end of the right restricting plate main body portion 54b and the restricting device base portion 45. .

  The left restricting position adjusting unit 60 is configured such that the cab 10 is disposed at the traveling position P1 and a gap is formed between the left side surface of the projecting portion 12 and the left restricting plate 52. It advances to the position where it abuts on the left side surface, and the displacement of the protrusion 12 to the left is restricted at that position. Specifically, the left restricting position adjusting unit 60 includes a left adjusting bolt 60a and a left retaining nut 60b. The left adjustment bolt 60a is screwed from the left side into a bolt hole formed so as to penetrate the left regulating plate main body 52b in the thickness direction. The left adjusting bolt 60a is screwed into the bolt hole so as to advance to the right, so that the tip of the left adjusting bolt 60a protrudes rightward from the left restricting plate main body 52b and comes into contact with the left side surface of the protruding portion 12. The leftward displacement of the protrusion 12 is restricted. Since the left adjustment bolt 60a is screwed into the bolt hole, the position of the left adjustment bolt 60a is fixed to the left regulating plate main body 52b so that the left adjustment bolt 60a is not displaced in the direction of the force even when a force in the left-right direction is applied. The left retaining nut 60b is screwed into the left adjustment bolt 60a on the left side of the left regulating plate main body 52b, and the left adjusting bolt 60a advances to the right by contacting the left side surface of the left regulating plate main body 52b. It will prevent it from going too far.

  The right restricting position adjusting unit 62 is arranged such that when the cab 10 is disposed at the travel position P1 and a gap is formed between the right side surface of the protruding portion 12 and the right restricting plate 54, the protruding portion 12 extends from the right restricting plate 54. It advances to the position where it abuts on the right side surface, and the rightward displacement of the protrusion 12 is restricted at that position. The right restricting position adjusting unit 62 has a structure that is symmetrical to the left restricting position adjusting unit 60. Specifically, the right restricting position adjusting unit 62 includes a right adjusting bolt 62a corresponding to the left adjusting bolt 60a and a right retaining nut 62b corresponding to the left retaining nut 60b. The right adjusting bolt 62a is adjusted to the left. The right retaining plate 62b is attached to the right regulating plate main body 54b in a configuration that is symmetrical with the bolt 60a, and the right retaining nut 62b is attached to the right adjusting bolt 62a in a configuration that is symmetrical with the left retaining nut 60b.

  The locking device 48 is in a state in which the protrusion 12 is engaged with the restriction 46 when the cab 10 is disposed at the travel position P1, that is, the protrusion 12 is between the left restriction plate 52 and the right restriction plate 54. In this device, the protrusion 12 is restrained with respect to the restricting portion 46 so that the inserted state is maintained in the space. The lock device 48 includes a lock pin 64 and a pin drive device 66.

  The lock pin 64 is disposed so as to extend in the left-right direction. The lock pin 64 is inserted into the pin guide portion 55 and supported by the pin guide portion 55 so as to be able to advance and retract in the axial direction (left-right direction) of the lock pin 64. Then, the lock pin 64 advances leftward from the pin guide portion 55 and is inserted into the restricting portion pin hole 54c and the protruding portion pin hole 35 (see FIG. 4), and the protruding portion pin hole 35. And it can move between the lock release position P4 (see FIG. 4) which is separated from the restricting portion pin hole 54c and retracted into the pin guide portion 55. When the driver's cab 10 is disposed at the travel position P1 and the protrusion 12 is inserted into the space between the left restriction plate 52 and the right restriction plate 54, the lock pin 64 advances to the lock position P3, so that the protrusion The part 12 is restrained with respect to the restriction part 46 so as not to escape from the space.

  The pin driving device 66 is a device that moves the lock pin 64 in the left-right direction so that the lock pin 64 moves between the lock position P3 and the lock release position P4. The pin driving device 66 has a connection portion 66a connected to the left end portion of the lock pin 64, and moves the connection portion 66a in the left-right direction using air pressure to move the lock pin 64 between the lock position P3 and the lock release position P4. And an air cylinder 66b that moves between them.

  Next, the operation | movement regarding raising / lowering of the cab 10 in the crane of this embodiment is demonstrated.

  At the time of crane work, in order to ensure a wide field of view from the cab 10, the cab 10 is arranged at the work position P2 (see FIG. 3). At this time, the hydraulic cylinder 44 of the drive mechanism 38 of the elevating device 13 extends, so that the link 36 rotates forward and upward with the link pin 40 as an axis, whereby the cab 10 and the link 36 have the link pin 40 as an axis. While rotating, it is lifted from the travel position P1 to the work position P2, and is fixed at the work position P2.

  On the other hand, when the crane is traveling, the cab 10 is arranged in advance at a traveling position P1 (see FIG. 3) suitable for an operator to perform operations for traveling the crane. At this time, the hydraulic cylinder 44 of the drive mechanism 38 of the elevating device 13 contracts so that the link 36 rotates rearward and downward with the link pin 40 as an axis, whereby the cab 10 and the link 36 together with the link pin 40 as an axis. The robot descends from the work position P2 to the travel position P1 while rotating. At this time, the end of each link arm 36a on the cab 10 side rotates relative to the base frame 28 with the link pin 41 as an axis, so that the bottom of the cab 10 is lowered while keeping the level. . Then, in the process from the position slightly before the traveling position P1 to the traveling position P1, the cab 10 moves backward while descending as shown in FIGS. Engages with the restricting portion 46.

  When the protruding portion 12 engages with the restricting portion 46, the protruding portion 12 is inserted into the space between the left restricting plate 52 (see FIG. 4) and the right restricting plate 54 from the front side. At this time, since the front end portion 52a of the left restricting plate 52 and the front end portion 54a of the right restricting plate 54 are opened to the left and right, even if the position of the protruding portion 12 is slightly shifted in the left and right direction, Guided between plates 52 and 54.

  The cab 10 moves backward while descending, and the contact portion 28a contacts the front surface of the contacted portion 16a as shown in FIG. 7, so that the cab 10 is positioned at the travel position P1 (see FIG. 3). . At this time, as shown in FIG. 4, the protrusion pin hole 35 and the restriction part pin hole 54 c are concentric with the protrusion 12 inserted between the left restriction plate 52 and the right restriction plate 54. Both positions coincide. In this state, the pin driving device 66 moves the lock pin 64 from the unlock position P4 to the lock position P3, and the lock pin 64 is inserted into the restricting portion pin hole 54c and the protruding portion pin hole 35. Thereby, the protrusion 12 is restrained so as not to be separated from between the left restricting plate 52 and the right restricting plate 54.

  Then, the left adjusting bolt 60a is advanced from the left restricting plate 52 to a position where the tip of the left adjusting bolt 60a of the left restricting position adjusting portion 60 comes into contact with the left side surface of the protruding portion 12, and the left adjusting nut 60b is used to adjust the left adjusting bolt 60a. Fix the position. Further, the right adjusting bolt 62a is advanced from the right restricting plate 54 to a position where the tip of the right adjusting bolt 62a of the right restricting position adjusting portion 62 contacts the right side surface of the protruding portion 12, and the right adjusting bolt 62a is moved by the right retaining nut 62b. Fix the position. In this state, the leftward displacement of the protrusion 12 is restricted by the left adjustment bolt 60a and the left restriction plate 52, and the rightward displacement of the protrusion 12 is restricted by the right adjustment bolt 62a and the right restriction plate 54. .

  When the cab 10 is moved from the travel position P1 to the work position P2, the pin driving device 66 moves the lock pin 64 from the lock position P3 to the lock release position P4, thereby releasing the restraint of the protrusion 12. Thereafter, the cab 10 is lifted from the travel position P1 to the work position P2 by the lifting device 13 as described above.

  In the present embodiment, when the cab 10 is disposed at the travel position P1, the protrusion 12 provided in the cab 10 engages with the restriction 46 provided in the lifting device support 18 of the turning base 6. Since the displacement of the protrusion 12 in the left-right direction is restricted, the displacement of the cab 10 in the left-right direction is restricted. For this reason, rattling exists in the pin coupling portion between the link 36 and the lifting device support portion 18 constituting the lifting device 13 and the pin coupling portion between the link 36 and the base frame 28 of the cab 10 or the link arm 36a. Even if the bend occurs, it is possible to suppress the lateral swaying of the cab 10 when vibrations occur in the fuselage during traveling of the crane, and as a result, the stability of the cab 10 is ensured. can do.

  In the present embodiment, a space is provided between the left restricting plate 52 and the right restricting plate 54 so that the front end is open and the protruding portion 12 is received when the cab 10 moves from the opened front end to the travel position P1. Therefore, the protrusion 12 is inserted into the space between the left restricting plate 52 and the right restricting plate 54 using the movement of the cab 10 toward the traveling position P1, and the protrusion 12 in the left-right direction is inserted. The displacement can be controlled by the left restricting plate 52 and the right restricting plate 54. For this reason, compared to a mobile crane configured to manually engage the restricting portion with the restricting portion and restrict the displacement of the engaging portion in the left-right direction after the cab reaches the traveling position. , Work load can be reduced.

  Further, in the present embodiment, the front end portion of the right side surface of the left regulating plate 52 and the front end portion of the left side surface of the right regulating plate 54 are inclined so as to be more apart from each other toward the front side. When moving from the work position P <b> 2 to the travel position P <b> 1, the protrusion 12 is easily introduced into the space between the left restriction plate 52 and the right restriction plate 54.

  Further, in the present embodiment, when the cab 10 is disposed at the travel position P1 and the protrusion 12 is inserted between the left restriction plate 52 and the right restriction plate 54, the left side surface of the protrusion 12 and the left restriction are disposed. When gaps are formed between the plate 52 and between the right side surface of the projection 12 and the right regulation plate 54, the left adjustment bolt 60a of the left regulation position adjustment unit 60 is applied to the left side surface of the projection 12. The right restricting plate 62 is advanced from the left restricting plate 52 to the contact position and fixed at that position, and the right adjusting bolt 62a of the right restricting position adjusting portion 62 is advanced from the right restricting plate 54 to the position where it abuts on the right side surface of the protruding portion 12. By fixing the protrusion 12 with the adjustment bolts 60a and 62a, the protrusion 12 can be sandwiched and fixed from both the left and right sides so that the protrusion 12 does not rattle from side to side due to the gap between the left and right sides of the protrusion 12. . Therefore, in the present embodiment, when the cab 10 is disposed at the travel position P1 and the protrusion 12 is inserted between the left restriction plate 52 and the right restriction plate 54, the left side surface of the protrusion 12 and the left restriction are disposed. Even when gaps are formed between the plate 52 and between the right side surface of the protrusion 12 and the right restricting plate 54, it is possible to reliably prevent the cab 10 from rolling.

  In the present embodiment, the locking device 48 causes the protrusion 12 to engage with the restricting portion 46 when the cab 10 is disposed at the travel position P1 (between the left restricting plate 52 and the right restricting plate 54). In a state of being inserted into the cab 10) and can prevent the cab 10 from being lifted from the traveling position P <b> 1. For this reason, for example, even when the brake is suddenly applied during traveling of the crane or when the hydraulic cylinder 44 malfunctions, the cab 10 is prevented from being lifted from the traveling position P1, and the cab 10 Can be ensured.

  In the present embodiment, the pin driving device 66 moves the lock pin 64 to the lock position P3 to engage the protrusion 12 with the restricting portion 46 (inserted between the left restricting plate 52 and the right restricting plate 54). On the other hand, the pin driving device 66 moves the lock pin 64 to the unlocking position P4 to move the protrusion 12 from the restricting portion 46 (between the left restricting plate 52 and the right restricting plate 54). It can be in a state where it can be detached. Therefore, in the present embodiment, no manual work is required to switch between the state in which the protrusion 12 is restrained while engaged with the restricting portion 46 and the state in which the protrusion 12 can be detached from the restricting portion 46. For this reason, a work burden can be reduced.

  Further, in the present embodiment, since the upper end edge of the rear end portion of the projecting portion 12 is inclined so that the height position is lowered toward the rear side, the cab 10 moves to the traveling position P1 and the projecting portion. It is possible to prevent the upper end portion of the rear end portion of the projecting portion 12 from interfering with the front end of the lifting device support portion 18 when the 12 enters the lower side of the lifting device support portion 18 and engages the restriction portion 46. it can.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes meanings equivalent to the scope of claims for patent and all modifications within the scope.

  For example, the arrangement of the locking device 48 may be reversed to the left and right in the above embodiment.

  Further, the lock device 48 may be omitted in the configuration of the above embodiment. Further, instead of the lock device 48 configured as described above, the position of the protrusion 12 is constrained so that the state where the protrusion 12 is engaged with the restricting portion 46 is maintained when the cab 10 is disposed at the travel position P1. Other possible locking devices may be provided. For example, a mechanical locking device that prevents the hydraulic cylinder 44 from being contracted when the cab 10 is disposed at the travel position P1 is provided, and the protrusion 12 is in a state where the protrusion 12 is engaged with the restricting portion 46. You may make it restrain the position of the part 12. FIG.

  In the configuration of the above embodiment, the left restricting position adjusting unit 60 and the right restricting position adjusting unit 62 may be omitted.

  In addition, the engaging portion provided in the cab is not limited to the configuration as in the above-described protruding portion 12, and the engaged portion provided in the turning base is limited to the configuration as in the restricting portion 46 described above. Not. For example, the position where the engaging portion is provided may be a position other than the rear end portion of the base frame of the cab, and the position where the engaged portion is provided may be a position other than the lower surface of the lifting device support portion of the turning base. That is, if the engaging portion and the engaged portion are engaged with each other when the cab is disposed at the traveling position, the engaging portion is provided at a position other than the position of the above-described protrusion and the engaged portion is engaged. You may provide a joint part in positions other than the position of the above-mentioned control part. Further, as a structure for engaging the engaging portion and the engaged portion with each other, the protrusion as the engaging portion is inserted into the space between the left restricting plate and the right restricting plate as described above. It is not limited to such a structure, and other structures may be adopted as long as the displacement of the engaging portion in the left-right direction is restricted in a state where the engaging portion and the engaged portion are engaged with each other. Also good.

  In the above embodiment, the engaging portion provided in the cab is a protrusion, and the engaged portion provided in the turning base is a restricting portion. However, the configurations of the engaging portion and the engaged portion are replaced with each other. May be. Specifically, a protruding portion may be provided as the engaged portion provided in the turning base, and a regulating portion may be provided as the engaging portion provided in the cab. In this case, the protrusion provided on the swivel base has a configuration that is reverse to the configuration of the protrusion in the above embodiment, and the restriction provided in the cab is reverse to the configuration of the restriction in the above embodiment. What is necessary is just to make it have a structure. That is, a protrusion is provided on the lower surface of the front end portion of the turning base so as to protrude forward (from the cab side) from the turning base, and between the left restriction plate and the right restriction plate on the lower surface of the rear end portion of the cab. A restricting portion is provided so that the space at the rear end opens, and the space between the left restricting plate and the right restricting plate provided in the driver's cab when the cab moves to the travel position from the rear end. What is necessary is just to make it insert the projection part provided in the turning base.

  In addition, the lifting device used in the present invention is not limited to the one in which the cab is connected to the turning base by a link and the cab is moved up and down while rotating together with the link. For example, you may employ | adopt the raising / lowering apparatus which raises / lowers a driver's cab between a driving | running | working position and work positions by a linear motion. Even in a mobile crane that employs such an elevating device, according to the present invention, it is possible to suppress rolling of the cab during traveling.

2 Lower traveling body 6 Rotating base 8 Working device 10 Driver's cab 12 Projection (engaging portion)
13 Lifting device 35 Projection pin hole (engagement pin hole)
36 Link 46 Restriction part (engaged part)
48 Locking device 52 Left regulating plate (left regulating part)
54 Right restriction plate (Right restriction part)
54c Restriction part pin hole (engaged part pin hole)
60 Left restriction position adjustment part 62 Right restriction position adjustment part 64 Lock pin 66 Pin drive device P1 Travel position P2 Work position P3 Lock position P4 Unlock position

Claims (7)

A mobile crane configured to be able to travel,
A lower traveling body,
A turning base mounted to be turnable on the lower traveling body;
A working device provided on the swivel base for performing crane work;
A driver's cab in which an operator operates the mobile crane and operates the working device for crane work;
A traveling position which is provided at the turning base and is a predetermined height position where the cab is disposed when the mobile crane is traveling and a position above the traveling position and is disposed at the time of crane work. A lifting device that moves up and down between the working position that is a position,
The cab is provided with an engaging portion,
The swivel base is engaged with the engaging portion so as to restrict displacement of the engaging portion in the left-right direction of the mobile crane when the cab is arranged at the traveling position. A mobile crane with a joint. The elevating device connects the cab to the turning base so that the cab can move between the travel position and the work position, and when the cab moves to the travel position. Having a link that supports the cab so as to reach the travel position by moving backward while descending;
One member of the engaging portion and the engaged portion is a protruding portion that protrudes from one of the driver's cab and the turning base portion provided with the one member to the other side,
The other member of the engaging portion and the engaged portion is configured such that the driver's cab is disposed at the traveling position in the other of the driver's cab and the turning base provided with the other member. Sometimes the driver's cab is at the travel position on the other of the left restricting portion disposed at the position facing the left side surface of the protrusion, the cab and the turning base provided with the other member. A right restricting portion disposed at a position facing the right side surface of the protruding portion when disposed,
Between the left restricting portion and the right restricting portion, an end located on the one side of the driver's cab and the turning base provided with the protrusion is opened, and from the opened end. The mobile crane according to claim 1, wherein a space for receiving the protrusion when the cab moves to the travel position is formed.   The right side surface of the left restricting portion and the left side surface of the right restricting portion each have an end portion located on the one side of the cab and the turning base portion, and these end portions are directed toward the one side. The mobile crane according to claim 2, wherein the mobile crane is inclined so as to go away from each other.   The engaged portion can move forward and backward from the left restricting portion to the protrusion side in the left-right direction, and can be fixed in that position when it contacts the left side surface of the protrusion. A left restricting position adjusting portion provided in the restricting portion, and capable of moving forward and backward from the right restricting portion to the protruding portion side in the left-right direction, and can be fixed in that state when contacting the right side surface of the protruding portion. The mobile crane according to claim 2, further comprising a right restricting position adjusting portion provided at the right restricting portion. The protrusion is provided in the cab so as to protrude rearward from the cab,
The engaged portion is provided below the front end portion of the turning base portion,
The mobile crane according to any one of claims 2 to 4, wherein an upper end edge of a rear end portion of the protruding portion is inclined such that a height position thereof decreases toward the rear side.   The lock apparatus which restrains the said engaging part so that the state which the said engaging part engaged with the said to-be-engaged part is maintained when the said cab is arrange | positioned in the said driving | running | working position is further provided. The mobile crane of any one of -5. The engaging portion is provided with an engaging portion pin hole whose axial direction is the left-right direction,
Of the engaged parts, the position corresponding to the position where the engaging part pin hole is arranged when the driver's cab is arranged at the traveling position is engaged with the left-right direction as the axial direction. Part pin hole is provided,
The lock device includes a lock pin arranged to extend in the left-right direction, a lock position where the lock pin is inserted into the engagement portion pin hole and the engaged portion pin hole, and the engagement portion pin hole. The mobile crane according to claim 6, further comprising: a pin driving device that moves the lock pin in the left-right direction so as to move between the unlocked position and the unlocked position.

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