JP2008297112A - Counter balance type crane - Google Patents

Counter balance type crane Download PDF

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Publication number
JP2008297112A
JP2008297112A JP2007147933A JP2007147933A JP2008297112A JP 2008297112 A JP2008297112 A JP 2008297112A JP 2007147933 A JP2007147933 A JP 2007147933A JP 2007147933 A JP2007147933 A JP 2007147933A JP 2008297112 A JP2008297112 A JP 2008297112A
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balance weight
contact
crane
suspension
hoisting
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JP2007147933A
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JP4840256B2 (en
Inventor
Hitoshi Kurotsu
Tomohiko Murata
朝彦 村田
仁史 黒津
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Kobelco Cranes Co Ltd
コベルコクレーン株式会社
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Abstract

An object of the present invention is to provide a counterbalanced crane that can detect an obstacle that interferes with a balance weight when the crane turns and travels, and that can prevent damage to a detection mechanism due to the interference with the obstacle.
A first hoisting means for hoisting a boom, a second hoisting means for hoisting the first hoisting means, and a balance suspended from the first hoisting means and disposed behind the upper swing body. A counterbalance type crane having a weight, a suspension member that is suspended from above the lower end of the balance weight, and that is in a tensile state extending linearly in the vertical direction by acting on a tensile force; The contact member 28 is suspended by the suspension member, and the limit switch 25 is urged in a substantially horizontal direction when the suspension member is pulled in the vertical direction by the weight of the contact member 28.
[Selection] Figure 6

Description

  The present invention relates to a counterbalance type crane provided with a balance weight, and more particularly to a counterbalance type crane provided with an obstacle detection device that detects that an obstacle interferes with the balance weight.

  As a conventional crane, there is a counterbalance type crane in which an upper swinging body is mounted on a crawler type lower traveling body so as to be capable of turning, and a balance weight is suspended from a rear end of the upper swinging body at a predetermined distance. is there. Standard crawler cranes (so-called standard cranes) are equipped with a counterweight at the rear of the upper revolving unit to balance the suspended load, but the balance weight increases the lifting capacity of the crawler crane. It is a so-called capacity increasing device that is used separately from the counter weight.

  Specifically, as disclosed in Patent Documents 1 to 3, the counterbalance type crawler crane includes a crawler type lower traveling body, and an upper revolving body that is rotatably mounted on the crawler type lower traveling body. A boom that can be raised and lowered with respect to the upper swing body, a first mast constituting a boom raising and lowering device for raising and lowering the boom, a second mast for raising and lowering the first mast, A balance weight suspended from one mast is provided as a main component. Generally, the first mast is a structure in which a large number of steel pipes are assembled in a lattice shape, and is called a so-called lattice type mast. The second mast is a steel material assembled in a rectangular shape and is called a so-called box-type mast. The first mast is configured to be larger and more robust than the second mast in terms of hanging the balance weight. The counter balance type crawler crane can be used as a standard crane by removing the balance weight and the first mast. In this case, the second mast constitutes the boom hoisting device. Specifically, by connecting the guy line connected from the second mast to the tip of the first mast to the tip of the boom, the boom is raised and lowered by the rotation of the second mast.

  By the way, in the counter balance type crane, a self-propelled balance weight (for example, refer to Patent Documents 1 and 2) in which a balance weight is mounted on a hydraulically driven carriage, and the balance weight is simply suspended from the first mast. There are only stationary balance weights (for example, see Patent Documents 3 and 4). Both balance weights are lifted from the grounded state by suspending heavy objects from the boom, and can be moved along with the turning of the upper turning body and the running of the crawler crane. In the case of the self-propelled type, it can be moved by the self-propelled carriage even if a heavy object is not suspended, but in the case of the stationary type, it is necessary to lift and move the balance weight by the fall of the boom.

  However, any balance weight is located behind the cab (cab) provided at the front of the upper swing body, and the rear of the upper swing body behind the cab becomes a blind spot. There is a problem that the operator cannot visually check the lifting of the balance weight.

  In order to solve such a problem, in the conventional counterbalance type crane, for example, in the case of a self-propelled balance weight, a pressure detector that detects a reaction force that the wheel of the carriage receives from the ground is provided to turn the wheel. In some cases, when the reaction force exceeds a certain value, the jack cylinder automatically operates to raise the carriage, and the wheels are separated from the ground (see, for example, Patent Document 2). In this case, if the reaction force received by the wheels is zero, the balance weight is lifted, so the lift of the balance weight can be notified to the operator in the cab. On the other hand, some stationary balance weights are provided with a limit switch for detecting the lifting of the balance weight. An example of this limit switch will be described with reference to FIG. 12. When the switch unit 91 and the ground G are touched, the switch unit 91 is pushed upward to turn on the switch unit 91, while not contacting the ground G. There are a lever 93 that protrudes downward from the bottom surface of the balance weight 92 to turn off the switch portion 91 and a roller 94 provided at the tip of the lever 93 to reduce sliding resistance with the ground G. It is provided as a configuration.

JP 61-203095 JP 09-240504 A JP 2002-87759 A US Pat. No. 5,035,337

  As described above, in the conventional counterbalance type crane, a pressure detector, a limit switch, and the like are used as means for detecting the lifting of the balance weight, but each has the following problems.

  The pressure detector has a problem that the amount of lifting of the balance weight from the ground cannot be set. For example, even if the balance weight is in contact with the ground, there may be a no-load state. In such a case, the balance weight is dragged in a grounded state. If it does so, a balance weight may get caught in the slight unevenness | corrugation of the ground, and there exists a possibility of causing trouble in the turning operation | movement and traveling operation | movement of a crane. In order to solve such a problem, it is conceivable to employ a proximity sensor that detects whether or not a predetermined distance or more from the ground. However, when working on rough terrain with many irregularities, the distance from the ground frequently changes, so the proximity sensor may react more than necessary, which may hinder the crane's turning and traveling operations.

  On the other hand, the limit switch has the merit that the amount of lifting from the ground can be set by appropriately setting the protruding length from the lower end of the balance weight, but there is a problem that it is easily damaged by interference with the obstacle. . Conventionally, a roller is provided at the lower end of the lever in order to reduce interference with an obstacle or the ground. However, if the obstacle interferes from the direction of the rotation axis of the roller, it may be damaged. In order to solve such problems, it is conceivable to employ a proximity sensor that can detect an obstacle. However, it is assumed that the proximity sensor does not perform a desired function, such as reacting to weeds that do not become obstacles.

  The present invention was devised in view of such a problem, and its purpose is to detect an obstacle that interferes with the balance weight when the crane turns and travels in order to protect the balance weight itself. An object of the present invention is to provide a counterbalanced crane that can detect ascent and prevent damage to a detection mechanism due to interference with an obstacle.

Means and effects for solving the problems

  The present invention relates to a counterbalance crane having a balance weight disposed behind an upper swing body. And the counter balance type crane which concerns on this invention has the following some features in order to achieve the said objective. That is, the counterbalance type crane of the present invention includes the following features alone or in combination as appropriate.

  In order to achieve the above object, the first feature of the counterbalance crane according to the present invention is that a lower traveling body traveling by a crawler, an upper revolving body mounted on the lower traveling body so as to be able to swivel, A boom that can be raised and lowered with respect to the upper revolving structure, a lifting tool suspended from the tip of the boom, a first raising and lowering means for raising and lowering the boom, and a first raising and lowering means for raising and lowering the first raising and lowering means In a counterbalance type crane having two hoisting means and a balance weight suspended from the first hoisting means and arranged behind the upper swing body, the counterweight crane is suspended from above the lower end of the balance weight. A suspended member that is lowered and is in a tensile state when a tensile force is applied in the vertical direction, a contact member suspended by the suspension member, and the contact It is to have a limit switch which is biased in a substantially horizontal direction when said hanging member by the weight of the wood became the tension.

  According to this configuration, when an obstacle (including the ground) abuts on the abutting member during turning or traveling of the crane, the suspension member tilts or relaxes from a vertical tension state or is bent. For example, the horizontal urging force with respect to the limit switch can be removed. Thereby, an obstacle that interferes with the balance weight can be detected. Since the contact member is suspended and installed by the suspension member, the degree of freedom in changing the position of the contact member is high. Therefore, when the contact member interferes with an obstacle when moving the balance weight, the limit switch, the suspension member, and the contact member are moved by moving the contact member, for example, overcoming the obstacle. It is possible to prevent an excessively large force from acting on the detection mechanism including the contact member. Thereby, it is possible to prevent the detection mechanism from being damaged.

  A second feature of the counterbalance crane according to the present invention is that the abutting member is disposed so as to protrude below the lower end of the balance weight.

  According to this configuration, when the lower end of the balance weight is grounded, the contact member receives a reaction force upward from the ground. In this case, since the tensile force due to the weight of the contact member acting on the suspension member due to the reaction force is removed and the urging force of the limit switch is removed, the grounding of the balance weight can be detected. In addition, when the abutment member rises from the ground as the balance weight rises, a tensile force due to the weight of the abutment member acts on the suspension member, and the limit switch can be biased in a substantially horizontal direction. It is possible to detect ascent.

  A third feature of the counterbalance crane according to the present invention is a switch box provided on a side surface of the balance weight and disposed at a position protruding from the side surface, and a suspension box suspended from the balance weight. A pressing member provided between the two suspended members and disposed so as to face the protruding surface, and the limit switch includes a virtual vertical surface including a suspension starting point of the hanging member; It is provided so as to protrude from the protruding surface so as to intersect.

According to this configuration, the limit switch is biased by the pressing member provided on the suspension member by shifting the suspension member to a tension state extending linearly in the vertical direction by the weight of the contact member. In this case, since the limit switch is urged by the pressing member, the shape of the suspending member can be simplified compared to a configuration in which the limit switch is urged directly by the suspending member.
The side surface of the balance weight is a concept including the left side surface, the right side surface, the front side surface, and the rear side surface when the balance weight is a substantially rectangular parallelepiped, for example, and is limited to the left and right side surfaces that can be the front side or the rear side in the turning direction. It is a concept that includes all aspects.

  A fourth feature of the counterbalance crane according to the present invention is that the pressing member is longer than the width of the switch box.

  According to this configuration, when the limit switch is biased, the pressing member is supported by the protruding surface in a state along the protruding surface of the switch box. At this time, since the width of the switch box is shorter than the width of the pressing member, both end portions of the pressing member are not supported by the protruding surface. Therefore, the pressing member can be rotated with the edge portion of the protruding surface of the switch box contacting the intermediate position of the pressing member as a fulcrum. By the rotation of the pressing member, the pressing member is inclined with respect to the projecting surface of the switch box, and accordingly, the bias of the limit switch can be released. As a result, when the balance weight moves, when the contact member interferes with an obstacle, the bias of the limit switch can be released more reliably.

  A fifth feature of the counterbalance crane according to the present invention is that the pressing member is formed to have a length substantially equal to or longer than the width-direction dimension of the side surface of the balance weight.

  According to this configuration, since the obstacle interferes with the pressing member without interfering with the balance weight at the height position of the pressing member, the approach of the obstacle can be reliably detected over the entire width direction of the balance weight. Further, since the distance from the contact position of the pressing member to the switch box to the end of the pressing member becomes longer, the pressing member is used as a fulcrum by applying a slight force to the end of the pressing member. Makes it easier to rotate and can more reliably detect obstacle interference.

  A sixth feature of the counterbalance crane according to the present invention is that the switch box is disposed so as to face a substantially central portion in the width direction of the pressing member.

  According to this configuration, since the distance from the contact position of the pressing member with the switch box to both end portions of the pressing member is substantially equal, the switch box can be mounted even when force is applied to either end portion of the pressing member. The pressing member as a fulcrum can be easily rotated.

  Moreover, the 7th characteristic in the counterbalance type crane which concerns on this invention is that the end surface in the longitudinal direction of the said contact member inclines so that it may approach the other end side, so that it goes below.

  According to this configuration, when an obstacle comes into contact with the end portion of the contact member from the longitudinal direction, the contact member easily rides on the obstacle. As a result, the tensile force acting on the suspension member due to the weight of the contact member is easily removed, so that the obstacle can be detected more reliably. Moreover, since it can suppress that the force which a detection mechanism receives from an obstruction becomes excessive by riding on an obstruction, it also becomes possible to prevent the detection mechanism from being damaged.

  An eighth feature of the counterbalance crane according to the present invention is that the contact member is configured not to sink under the balance weight.

  According to this configuration, even if an obstacle hits the contact member, the contact member and the suspension member are not caught under the balance weight. Accordingly, it is possible to prevent an excessively large tensile force from acting on the suspension member, and it is possible to prevent the detection mechanism from being damaged.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is an overall view of a counterbalance crane provided with a balance weight obstacle detection device according to an embodiment of the present invention, and shows a state in which the balance weight is lifted from the ground. 2 and 3 are diagrams showing balance weights viewed from the directions of arrows A1 and A2 in FIG. 1, respectively. In the following description, the direction indicated by the arrow B1 in FIGS. 1 and 3 is referred to as the front, the direction indicated by the arrow B2 is referred to as the rear, and the direction indicated by the arrow C1 in FIGS. The direction indicated by the arrow C2 is referred to as the right side.

  A counterbalance type crane 100 (hereinafter referred to as a crane 100) shown in FIG. 1 is mounted on a lower traveling body 1 composed of a crawler, and on the lower traveling body 1 so as to be rotatable around a vertical axis via a swing bearing. The upper swing body 2, the cab 3 serving as a driving cab and a cockpit for crane work provided on the upper swing body 2, and the upper swing body 2 are attached to the upper swing body 2 so that it can be raised and lowered around the boom foot pin 4a. Boom 4, hanger 17 hung from the tip of boom 4, and boom provided via boom guy line 6 and boom hoisting rope 7 provided on upper swing body 2 so as to be able to rise and fall around mast foot pin 5 a. 4 and a top part of the lattice type mast 5 which is provided on the upper swing body 2 so as to be freely raised and lowered around the mast foot pin 5a. A box-type mast 10 (second hoisting means) that is connected via a mast guy line 18 and connected to the upper swing body 2 via a hoisting rope 19, the top of the lattice-type mast 5, and a cable 8. A balance weight 9 that is suspended and arranged behind the upper swing body 2 is provided as a main component.

  The crane 100 according to the present embodiment can be used as a standard crane by removing the balance weight 9 and the lattice type mast 5. In this case, the box mast 10 constitutes a boom hoisting device. Specifically, by using the mast guy line 18 connected from the box type mast 10 to the tip of the lattice type mast 5 as a boom guy line connecting to the tip of the boom 4, the boom 4 is raised and lowered by the rotation of the box type mast 10. Can be made. That is, the crane 100 shown in FIG. 1 is a modification from the standard crane.

  As shown in FIG. 2, the balance weight 9 includes a plurality of weight members 11, a base member 12 formed in a rectangular parallelepiped shape having a mounting surface 12a on which the plurality of weight members 11 can be stacked, and a mounting surface 12a. A pair of connecting mechanisms 13 and 13 connected to a pair of cables 8 and 8 that are attached to the base member 12 so as to protrude from the lattice-type mast 5 so as to protrude from the lattice type mast 5, and both side surfaces 12b of the base member 12 in the left-right direction. The obstacle detection devices 14 and 15 installed in 12c are provided as main components. As shown in FIGS. 1 and 3, the connecting mechanism 13, 13 and the upper swing body 2 are connected by a pair of cables 16, 16, and the balance weight 9 is moved away from the upper swing body 2. Movement is constrained.

  As shown in FIG. 3, the obstacle detection device 14 is disposed at a position close to the upper swing body 2 on the right side surface 12 b that is the right end surface of the base member 12, and the upper portion of the base member 12 in the front-rear direction. The base member 12 is formed so as to extend from the position of the front side surface 12 d facing the revolving body 2 to the substantially central portion of the base member 12. On the other hand, the obstacle detection device 15 is disposed at a position away from the upper swing body 2 on the left side surface 12c that is the left end surface of the base member 12, and the position of the rear side surface 12e of the base member 12 in the front-rear direction. To the substantially central part of the base member 12. The obstacle detection device 14 and the obstacle detection device 15 are obstacle detection devices having the same structure.

  FIG. 4 is an enlarged view of the balance weight 9 in FIG. In FIG. 4, the weight member 11 placed on the base member 12 is omitted, and a part of the push plate 29 (pressing member) is cut away. FIG. 5 is a view of the obstacle detection device 14 shown in FIG. 4 as viewed from the direction of the arrow A2 (view from above). In FIG. 5, a part of the switch box 24 is cut away. FIG. 6 is a view of the obstacle detection device 14 shown in FIG. 4 as viewed from the direction of arrow A3 (view from the front).

  As shown in FIG. 4, the coupling mechanism 13 is attached with a pair of bracket portions 13 a and 13 a fixed to both ends in the front-rear direction on the mounting surface 12 a of the base member 12 and a cable 8 extending from the lattice type mast 5. The first link portion 13b, the second link portion 13c that is pivotably coupled around the first link portion 13b and the pin 13x, and the second link portion 13c and the bracket portions 13a and 13a. It is comprised by a pair of 3rd link part 13d * 13d. The third link portion 13d is pivotally supported at both ends by support pins 13y and 13z with respect to the second link portion 13c and the bracket portion 13a. In addition, one end of a cable 16 extending from the upper swing body 2 is connected to the second link portion 13c via a pin 16a.

  The obstacle detection device 14 includes a substrate 21 fixed to the right side surface 12b of the base member 12 by, for example, a bolt, and a cross section perpendicular to the protruding direction while one end is fixed to the substrate 21 and protrudes in a substantially horizontal direction. A pair of front and rear suspension brackets 22, 23 configured as cantilever beams having a substantially L shape, and a switch box 24 attached below the position where the suspension brackets 22, 23 are provided on the substrate 21. And the limit switch 25 provided so as to be able to project from the side surface of the switch box 24, and the suspension brackets 22 and 23 as the starting points and suspended via two wire ropes 26 and 27 (suspending members). The main contact element 28 and the pressing plate 29 fixed at both ends to the two wire ropes 26 and 27 are provided as main components. That.

  As shown in FIG. 6, the switch box 24 includes a bottom plate 24e fixed to the substrate 21 with bolts and the like, a pair of wall surface portions 24a and 24a extending from the bottom plate 24e so as to form a substantially horizontal plane, It has a protruding surface 24b that connects the end portions of the wall surface portions 24a and 24a so as to form a substantially vertical surface, and is configured as a box-shaped member that opens in the front-rear direction.

  As shown in FIG. 5, the protruding surface 24 b of the switch box 24 is formed so that the dimension in the front-rear direction is shorter than the dimension in the front-rear direction of the push plate 29 fixed at both ends to the wire ropes 26, 27. Yes. The switch box 24 is installed below the suspension brackets 22 and 23, and the position of the crane 100 in the front-rear direction is substantially the center position between the suspension bracket 22 and the suspension bracket 23. It is fixed to the substrate 21.

  Further, the limit switch 25 rotates around a switch body 25a fixed to the inner wall surface of the switch box 24 inside the switch box 24 and a rotation shaft 25x extending in a substantially vertical direction with respect to the switch body 25a. And a lever 25b that is attached in a possible manner. Further, a roller that is rotatable around an axis parallel to the rotation shaft 25x is attached to the tip of the lever 25b.

  The switch body 25a is attached to the front side of the center position in the front-rear direction in the switch box 24. That is, the switch main body 25a is disposed so as to be positioned forward of the center position between the hanging brackets 22 and 23. The lever 25b extends from the rotation shaft 25x of the switch body 25a as a starting point so as to incline toward the rear side from the direction orthogonal to the substrate 21.

  The limit switch 25 is fixed to the switch box 24 so that the position of the lever tip of the lever 25b is located at the approximate center of the switch box 24 in the front-rear direction.

  The lever 25b is elastically acted on by an elastic member such as a spring (not shown) in the direction of rotation in the direction of arrow E1 in FIG. 5, that is, the direction in which the tip of the lever 25b protrudes from the protruding surface 24b. When the external force that pushes the lever 25b into the switch box 24 is not acting against the elastic force, the tip of the lever 25b is inserted through the opening formed in the protruding surface 24b of the switch box 24. The switch box 24 is configured to protrude outward. Then, the tip of the lever 25b is urged toward the substrate 21 so that the lever 25b can be rotated to enter the inside of the switch box 24. In FIG. 5, a state where the urging by the push plate 29 is released (hereinafter referred to as an urging release state) is indicated by a two-dot chain line. When the lever 25b is rotated by a predetermined angle from the bias release state so that the tip of the lever 25b enters the switch box 24, a detection signal is sent from the limit switch 25 to the control unit for controlling the operation of the crane 100 (not shown). Is sent. When the control unit receives the signal, it is determined that the balance weight 9 has been lifted, and the crane 100 is controlled to be able to turn and travel.

  As shown in FIGS. 4 and 6, the contact member 28 is formed in a columnar shape, and bracket portions 28 a and 28 a extending upward are provided on the upper arc surface in the vicinity of both end portions in the columnar axis direction. In the present embodiment, the contact member 28 is formed in an internal hollow cylindrical shape with both end faces closed. The wire ropes 26 and 27 extending from the suspension brackets 22 and 23 are connected to the bracket portions 28a and 28a so that the columnar axial direction of the contact member 28 and the longitudinal direction of the crane 100 are substantially parallel. The contact member 28 is suspended. Moreover, both end surfaces 28b and 28b in the cylindrical axis direction of the contact member 28 are inclined with respect to the vertical direction so as to approach the other end surface side as going downward.

  Further, the abutting member 28 extends below the lower end surface 12 f of the base member 12, and the cylindrical central axis P of the abutting member 28 is above the lower end surface 12 f of the base member 12. It is suspended so as to be located. That is, in the state where the wire ropes 26 and 27 extend linearly in the vertical direction, the length of the contact member 28 that extends downward from the lower end of the balance weight 9 is shorter than the cylindrical radius of the contact member 28. It is comprised so that it may become.

  In this way, the obstacle detection device 14 is attached to the balance weight 9, and in a state where no tensile force is acting, the balance weight 9 can be bent by the wire ropes 26 and 27 and the wire ropes 26 and 27 that can be bent. The abutting member 28 is provided so as to be able to extend to a position closer to the ground than the lower end surface 12f.

  And the switch box 24 which is provided in the right side surface 12b of the base member 12, and is provided in the position which protruded from the said right side surface 12b, and the both ends in a horizontal direction are fixed with respect to the wire ropes 26 and 27. And a rectangular push plate 29 disposed so as to face the protruding surface 24b. Further, as shown in FIG. 5, the lever 25b of the limit switch 25 includes virtual suspension points 22a and 23a of the wire ropes 26 and 27 when the biasing force from the push plate 29 is not applied. It is provided so as to be able to project from the projecting surface 24b so as to intersect the vertical surface α1.

  Next, the operation of the obstacle detection device 14 will be described. FIGS. 7A and 7B are diagrams illustrating an example of the state of the obstacle detection device 14 when the balance weight 9 is grounded. FIG. 8 is a view showing a state in which the obstacle X is in contact with one end of the contact member 28 shown in FIG. FIG. 9 is a schematic view of the state in which the obstacle X is in contact with the contact member 28 as viewed from the front.

  As shown in FIGS. 7A and 7B, in a state where the balance weight 9 is placed on the ground, the contact member 28 contacts the ground and is supported by the ground. Therefore, the wire ropes 26 and 27 do not receive a tensile force due to the weight of the contact member 28. Thereby, wire rope 26 * 27 shifts to a relaxation state, and bends. At this time, since the push plate 29 is inclined and separated from the limit switch 25, the bias of the limit switch 25 is released. The lever 25b of the limit switch 25 rotates so as to project from the projecting surface 24b of the switch box 24 by an elastic return force by an elastic body such as a spring (not shown) when the biasing in the substantially horizontal direction by the push plate 29 is released. Move. In the bias release state in which the lever 25b of the limit switch 25 protrudes from the protruding surface 24b, no detection signal is transmitted to the control unit for controlling the operation of the crane 100 so that the crane 100 cannot be turned or traveled. It is controlled by the control unit.

  On the contrary, when the wire ropes 26 and 27 are pulled by the weight of the contact member 28, that is, when the balance weight 9 is pulled upward, the contact member 28 floats along with the balance weight 9. In this case, the limit switch 25 is biased by the push plate 29 attached to the wire ropes 26 and 27, and shifts to a biased state in which the limit switch 25 is rotated to the position of the protruding surface 24b. In this case, a detection signal is transmitted from the limit switch 25 to the control unit of the crane 100, and the crane 100 can be turned and traveled.

  7 shows a state in which the wire ropes 26 and 27 are bent and the push plate 29 is separated from the limit switch 25. For example, the wire ropes 26 and 27 are connected to the wire ropes 26 and 27. In the case where the weight of the contact member 28 hangs vertically down to the height of the limit switch 25, if the tensile force due to the weight of the contact member 28 is not applied, the lever 25b is elastically restored by a spring or the like so as to push away the push plate 29. By rotating in the E1 direction, the wire ropes 26 and 27 are biased laterally through the push plate 29, and the wire ropes 26 and 27 are bent. That is, when the tensile force due to the weight of the contact member 28 does not act on the wire ropes 26 and 27, the lever 25b of the limit switch 25 can shift to the bias release state in which the lever 25b protrudes from the protruding surface 24b of the switch box 24. It is configured.

  In addition, as shown in FIG. 8, when the crane 100 is swung so that the balance weight 9 moves in the direction of the arrow C2 in the figure in a state where the balance weight 9 is lifted, an obstacle is seen from the side. When X collides with the end of the contact member 28, the end of the contact member 28 is urged so as to approach the right side surface 12 b of the base member 12. At this time, the push plate 29 attached to the wire ropes 26 and 27 moves so as to rotate in a substantially horizontal plane with a corner 24c extending in the vertical direction on the front side of the switch box 24 as a fulcrum. Then, the surface of the push plate 29 facing the switch box 24 is separated from the projecting surface 24b of the switch box 24, and the lever 25b of the limit switch 25 projects from the projecting surface 24b toward the outside of the switch box 24. Rotate. Thereby, the limit switch 25 shifts to the bias release state, and the turning and traveling operation of the crane 100 is forcibly stopped.

  As shown in FIG. 8, the push plate 29 is not limited to the case where the obstruction contacts the front end of the abutting member 28 but also when the obstruction contacts the rear end. By rotating the corner 24d on the rear side of the box 24 as a fulcrum, the limit switch 25 is shifted to the bias release state.

  Further, as schematically shown in FIG. 9, when the contact member 28 contacts the obstacle X and is urged toward the right side surface 12 b of the base member 12, the center of the cylinder of the contact member 28 The shaft P is in contact with the substrate 21 attached to the right side surface 12b so that the position of the axis P is higher than the lower end surface 12f of the base member 12. In this case, the contact member 28 does not intersect the virtual plane α2 including the surface 21a of the substrate 21. That is, since the contact member 28 is not positioned vertically below the substrate 21 and the right side surface 12b, the contact member 28 is moved vertically upward by the substrate 21 and the base member 12 in a state of contacting the substrate 21. There is no hindrance to the move.

  And when the contact member 28 is urged | biased by the obstruction X in the lower half surface of the said contact member 28, the direction of the normal force N1 received from the obstruction X will incline vertically upward rather than a horizontal direction. Become. Therefore, the contact member 28 moves upward along the surface 21a of the substrate 21 so as to ride on the obstacle X. As described above, the contact member 28 is easily slid upward and is not easily subjected to a rotational moment about the contact portion 28p. Even if it contacts an obstacle, the contact member 28 can be prevented from being caught vertically below the base member 12.

  Note that the contact member 28 is not necessarily formed in a cylindrical shape, but is formed as a contact member 38 having a polygonal column shape, for example, a rectangular column shape, as schematically shown in FIG. When the abutting member 38 is brought into contact with the right side surface 12b, the lower part of the abutting member 38 located on the ground side with respect to the abutting part 38p does not intersect the virtual plane α3 including the right side surface 12b. The normal line N2 on the surface 38a that can be biased toward 12b may be configured to tilt vertically upward from the horizontal direction toward the virtual plane α3. Even in this case, the upward movement of the contact member 38 is not hindered. Therefore, when the contact member 38 comes into contact with the obstacle X, the contact member 38 is placed vertically below the base member 12. It can prevent being caught.

  As described above, in the crane 100 according to the present embodiment, when the balance weight 9 is grounded, the contact member 28 is grounded and the wire ropes 26 and 27 are maintained in a relaxed state. On the other hand, in a state where the balance weight 9 is lifted up to a predetermined height, the wire ropes 26 and 27 are moved to a linear state and the contact member 28 is lifted. Then, the limit switch 25 is urged by the push plate 29 and the lift of the balance weight 9 is detected by shifting the wire ropes 26 and 27 to a tension state extending linearly in the vertical direction by the weight of the contact member 28. can do.

  Since the limit switch 25 is urged using the push plate 29, the range in which the limit switch 25 can be urged can be widened, and the limit switch 25 can be urged more reliably. it can. Further, when the crane 100 turns, for example, the contact member 28 is in contact with an obstacle at a position away from the urging position of the limit switch 25 by the push plate 29, such as a longitudinal tip. When the push plate 29 is moved, the bias of the limit switch 25 is released.

  In addition, when the balance weight 9 is lifted, the contact member 28 is suspended from the balance weight 9 by the wire ropes 26 and 27. Therefore, when the balance weight 9 is moved, the contact member 28 Even if 28 interferes with an obstacle, the contact member 28 can move without excessively preventing relative movement of the obstacle relative to the balance weight 9. Thereby, it is possible to prevent an excessively large force from acting on members constituting the obstacle detection device 14 and to prevent the obstacle detection device 14 from being damaged.

  In the state where the limit switch 25 is energized, the push plate 29 is supported by the projecting surface 24b along the projecting surface 24b of the switch box 24, but in the longitudinal direction. Since the width of the push plate 29 is longer than the width of the switch box 24 facing the push plate 29, the movement in the direction approaching the right side surface 12 b of the base member 12 is restricted at both longitudinal ends of the push plate 29. It will never be done. That is, the push plate 29 can be easily rotated in a horizontal plane with the corner portion 24c or 24d of the switch box 24 contacting the intermediate position in the horizontal direction of the push plate 29 as a fulcrum. Accordingly, the push plate 29 is inclined with respect to the projecting surface 24b of the switch box 24, and accordingly, the bias of the limit switch 25 can be released.

  Further, since the abutting member 28 is formed as a long member and is arranged so as to be substantially parallel to the side surface of the balance weight 9 and along the side surface, the balance weight 9 is moved when the balance weight 9 is moved. Thus, it is possible to detect an obstacle that can interfere with 9 in a wider range.

  Further, since the end surface in the longitudinal direction of the contact member 28 is inclined so as to approach the other end side as it goes downward, an obstacle is formed on the end portion of the contact member 28 from a direction substantially parallel to the longitudinal direction. Even in the case of contact, the abutting member 28 can easily ride on the obstacle. When the abutting member 28 rides on the obstacle, the wire rope 26 or 27 located on the end side where the obstacle comes into contact shifts to a relaxed state, so that the obstacle can be detected.

  In addition, since the contact member 28 is configured not to sink under the balance weight 9, even if an obstacle hits the contact member 28, the contact member 28 and the wire ropes 26 and 27 are not balanced. It will not be caught below. Thereby, it is possible to prevent an excessively large tensile force from acting on the wire ropes 26 and 27, and the suspension brackets 22 and 23 that are the starting points of suspension of the wire ropes 26 and 27 are damaged. It becomes possible to prevent damage. Note that the length of the suspension member, the distance between the suspension start point of the suspension member and the side surface of the balance weight, and the shape and size of the contact member shown in the present embodiment are not limited, and these may be set as appropriate. Thus, it is possible to configure so that the contact member does not sink below the balance weight 9.

  Next, a modification of the obstacle detection device 14 according to the above-described embodiment will be described with reference to FIG. FIG. 11 is a diagram corresponding to FIG. 4 used in the description of the embodiment, and the same members are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 11, the obstacle detection device 14 ′ according to the modification is configured such that the distance between the suspension brackets 22 and 23 is substantially equal to the width direction dimension of the side surface of the balance weight 9. ing. The contact member 28 ′ and the push plate 29 ′ are formed to be slightly longer than the width direction dimension of the side surface of the balance weight 9 and are attached to the wire ropes 26 and 27 suspended from the suspension brackets 22 and 23. ing. In addition, the switch box 24 is provided so as to be positioned approximately at the center of the balance weight 9 in the front-rear direction.

  According to this configuration, the distance from the contact position of the push plate 29 ′ with the switch box 24 to both ends of the push plate 29 ′ can be further increased. In this case, when the abutting member 28 ′ abuts against an obstacle, a force is applied to the end of the push plate 29 ′ via the wire ropes 26 and 27, so that the switch plate 24 ′ serves as a fulcrum. It becomes easy to rotate, and it becomes possible to detect interference of an obstacle more reliably. In addition, since the contact member 28 ′ covers the entire area of the balance weight 9 in the front-rear direction, an obstacle that can interfere with the side surface of the balance weight 9 can be reliably detected regardless of the position in the front-rear direction.

  In the modification of FIG. 11, the contact member 28 ′ and the push plate 29 ′ are formed slightly longer than the width direction dimension of the side surface of the balance weight 9. Even if the length is the same, the same effect as that of the above modification can be obtained.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims.

(1) The suspension member is not limited to the case of using a wire rope, and may be configured using a cord-like member such as a string, a metal wire, or a chain. Even in this case, as shown in the above embodiments, the biasing force on the limit switch can be removed by shifting the cord-like member from the tension state to the relaxation state.
In addition, the suspension member may be configured not only by the cord-like member but also by an elastic band plate made of rubber or synthetic resin, or a rod-like member or plate-like member made of a flexible material such as a metal material or synthetic resin. When a flexible rod-like member or plate-like member is used, the biasing force against the limit switch is reduced by the flexible rod-like member or plate-like member being bent by a compressive force when the contact member is grounded. Can be removed.

(2) The present invention is not limited to the case where a plate-like member such as the push plate 29 is used as the pressing member that urges the limit switch 25. For example, it may be a rod-shaped member whose ends are fixed to two hanging members.

(3) The limit switch 25 may be directly urged by the suspension member such as the wire ropes 26 and 27 without using the pressing member such as the push plate 29. In this case, for example, on the lever 25b side of the limit switch 25, a receiving portion (for example, a plate-like member) that makes it easy to receive interference from the suspension members such as the wire ropes 26 and 27, or the suspension member itself is a plate. It is possible to energize the limit switch 25 more reliably by expanding the area that can be energized.

(4) Not only when the obstacle detection devices are installed on the left and right side surfaces 12b and 12c of the balance weight 9, but the front side surface 12d facing the upper swing body in the balance weight, or the rear side surface 12e opposite to the end surface. It is also possible to install a balance weight obstacle detection device. By installing the obstacle detection devices on the left and right side surfaces 12b and 12c, the obstacle weight can be detected when the balance weight 9 moves as the crane 100 turns, and the front side surface 12d and the rear side surface 12e can be detected. By installing the obstacle detection device, it becomes possible to detect an obstacle when the balance weight 9 moves as the crane 100 travels in the front-rear direction.

(5) Not only the counterbalance type crane using the stationary balance weight 9 to be lifted and moved, but also a traveling balance weight using a weight carriage having wheels, in a state where the weight carriage is grounded, The contact member is suspended by the suspension member so that the lower end of the contact member is located upward from the ground, that is, the lower end of the contact member is positioned above the lower end of the weight carriage. It may be a counterbalance type crane having a different configuration. In this case, an obstacle approaching the side surface of the weight carriage can be detected. For example, by suspending the abutment member with the suspension member so that the lower end of the abutment member is positioned at the height of the rotating shaft of the weight carriage wheel, it is possible to reliably obstruct obstacles that are difficult to get over with the weight carriage. It becomes possible to detect.

1 is an overall view of a counterbalance crane according to an embodiment of the present invention. It is a figure which shows the balance weight seen from the arrow A1 direction in FIG. It is a figure which shows the balance weight seen from the arrow A2 direction in FIG. It is an enlarged view of the balance weight in FIG. It is the figure which looked at the obstacle detection apparatus shown in FIG. 4 from arrow A2. It is the figure which looked at the obstacle detection apparatus shown in FIG. 4 from arrow A3 direction. It is a figure which shows the obstruction detection apparatus in a grounding state. It is a figure which shows the state which the obstacle contacted to the end of the contact member shown in FIG. It is the schematic diagram which looked at the state where the obstacle contacted the contact member from the front. It is the schematic diagram which looked at the state where the obstacle contacted the contact member concerning a modification from the front. It is a figure which shows the obstruction detection apparatus which concerns on a modification. It is a figure which shows an example of the conventional floating detection apparatus.

Explanation of symbols

1 Lower traveling body 4 Boom 5 Lattice type mast (first hoisting means)
9 Balance weight 10 Box type mast (second hoisting means)
DESCRIPTION OF SYMBOLS 11 Weight member 12 Base member 14, 15 Obstacle detection apparatus 17 Hanging tool 21 Board | substrate 22, 23 Hanging bracket 24 Switch box 24b Projecting surface 25 Limit switch 26, 27 Wire rope (hanging member)
28 Contact member 29 Press plate (pressing member)
38 Contact member 100 Crane

Claims (8)

  1. A lower traveling body that is driven by a crawler, an upper revolving body that is turnably mounted on the lower traveling body, a boom that can be raised and lowered with respect to the upper revolving body, and a suspension from the tip of the boom The first hoisting means for hoisting the boom, the second hoisting means for hoisting the first hoisting means, and the upper swing body suspended from the first hoisting means. In the counterbalance type crane with the balance weight arranged at the rear,
    A suspension member that is suspended from above the lower end portion of the balance weight and that is in a tensile state when a tensile force in the vertical direction acts,
    A contact member suspended by the suspension member;
    A counterbalance type crane, comprising: a limit switch that is biased in a substantially horizontal direction when the suspension member is in the tensioned state due to its own weight.
  2.   2. The counterbalance crane according to claim 1, wherein the contact member is disposed so as to protrude below a lower end of the balance weight.
  3. A switch box provided on a side surface of the balance weight and provided with a protruding surface disposed at a position protruding from the side surface;
    A pressing member provided between the two suspension members suspended from the balance weight, and disposed so as to face the projecting surface;
    3. The counterbalance crane according to claim 1, wherein the limit switch is provided so as to project from the projecting surface so as to intersect a virtual vertical surface including a suspension starting point of the suspension member. .
  4.   The counterbalance crane according to claim 3, wherein the pressing member is longer than a width of the switch box.
  5.   5. The counterbalance crane according to claim 4, wherein the pressing member is formed to have a length substantially equal to or longer than a dimension in a width direction of a side surface of the balance weight.
  6.   The counter balance type crane according to any one of claims 3 to 5, wherein the switch box is disposed so as to face a substantially central portion in the width direction of the pressing member.
  7.   The counterbalance crane according to any one of claims 1 to 6, wherein an end surface of the abutting member in the longitudinal direction is inclined so as to approach the other end as it goes downward.
  8.   The counterbalance type crane according to any one of claims 1 to 7, wherein the abutting member is configured not to sink under a balance weight.
JP2007147933A 2007-06-04 2007-06-04 Counterbalance type crane Active JP4840256B2 (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010058759A1 (en) 2008-11-20 2010-05-27 旭硝子株式会社 Transparent body inspecting device
EP2354077A1 (en) 2010-02-09 2011-08-10 Kobelco Cranes Co., Ltd. Mobile crane having counterweight
CN102556861A (en) * 2012-02-06 2012-07-11 徐工集团工程机械股份有限公司 Counterweight pulling plate device for crane and crane
CN102602831A (en) * 2012-03-26 2012-07-25 徐州重型机械有限公司 Safety detecting device for installation of counterweight of large-tonnage crane
CN103086270A (en) * 2013-01-31 2013-05-08 徐工集团工程机械股份有限公司 Flexible connecting and fixing structure and equalizing beam
US8887933B2 (en) 2009-12-28 2014-11-18 Hitachi Sumitomo Heavy Industries Construction Crane Co., Ltd. Counterweight suspension device and mobile crane
WO2017099277A1 (en) * 2015-12-10 2017-06-15 볼보 컨스트럭션 이큅먼트 에이비 Device for protecting pipe layer boom
JP2017226530A (en) * 2016-06-24 2017-12-28 コベルコ建機株式会社 Method for connecting mobile crane guyline and pallet weight, and mobile crane
JP2018002385A (en) * 2016-06-30 2018-01-11 コベルコ建機株式会社 Method for placing workpiece on transport base, method for lifting workpiece from transport base, and transport base

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JPS53438A (en) * 1976-06-23 1978-01-06 Babcock Hitachi Kk Combustion method and apparatus
JPS63277194A (en) * 1987-05-08 1988-11-15 Sumitomo Kenki Kk Balance weight operating device for conuter balance crane
JPH01143788A (en) * 1987-11-27 1989-06-06 Sumitomo Light Metal Ind Ltd Manufacture of vacuum container

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53438A (en) * 1976-06-23 1978-01-06 Babcock Hitachi Kk Combustion method and apparatus
JPS63277194A (en) * 1987-05-08 1988-11-15 Sumitomo Kenki Kk Balance weight operating device for conuter balance crane
JPH01143788A (en) * 1987-11-27 1989-06-06 Sumitomo Light Metal Ind Ltd Manufacture of vacuum container

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010058759A1 (en) 2008-11-20 2010-05-27 旭硝子株式会社 Transparent body inspecting device
US8887933B2 (en) 2009-12-28 2014-11-18 Hitachi Sumitomo Heavy Industries Construction Crane Co., Ltd. Counterweight suspension device and mobile crane
EP2354077A1 (en) 2010-02-09 2011-08-10 Kobelco Cranes Co., Ltd. Mobile crane having counterweight
US8528755B2 (en) 2010-02-09 2013-09-10 Kobelco Cranes Co., Ltd. Mobile crane having counterweight
CN102556861A (en) * 2012-02-06 2012-07-11 徐工集团工程机械股份有限公司 Counterweight pulling plate device for crane and crane
CN102602831A (en) * 2012-03-26 2012-07-25 徐州重型机械有限公司 Safety detecting device for installation of counterweight of large-tonnage crane
CN103086270A (en) * 2013-01-31 2013-05-08 徐工集团工程机械股份有限公司 Flexible connecting and fixing structure and equalizing beam
WO2017099277A1 (en) * 2015-12-10 2017-06-15 볼보 컨스트럭션 이큅먼트 에이비 Device for protecting pipe layer boom
JP2017226530A (en) * 2016-06-24 2017-12-28 コベルコ建機株式会社 Method for connecting mobile crane guyline and pallet weight, and mobile crane
JP2018002385A (en) * 2016-06-30 2018-01-11 コベルコ建機株式会社 Method for placing workpiece on transport base, method for lifting workpiece from transport base, and transport base

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