JP2012218606A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve work efficiency when suspending a vehicle body by using a rope.SOLUTION: A getting on-and-off step 25 is constituted of: a frame body 26 fixed to a vehicle body 2; an attachable-detachable footboard 29 detachably arranged between a rear vertical plate 26A and a front vertical plate 26B for constituting the frame body 26; and a fixed footboard 31 fixedly arranged between the rear vertical plate 26A and the front vertical plate 26B. Thus, when suspending the front side of the vehicle body 2 by using a wire rope 104, even if the wire rope 104 installed in a hook member 24 is installed in a crane 102 by passing through between the rear vertical plate 26A and the front vertical plate 26B of the frame body 26, the attachable-detachable footboard 29 arranged in an area for passing the wire rope 104 can be removed in advance. As a result of this, troublesome work such as removing the whole getting on-and-off step 25 from the vehicle body 2 can be eliminated, and the work efficiency when suspending the vehicle body 2 can be enhanced.

Description

  The present invention relates to a construction machine such as a dump truck that transports, for example, minerals mined in a mine or the like.

  Generally, in open pit mines and mines, a large amount of minerals and earth and sand are excavated using a hydraulic excavator, and the excavated large amount of minerals is loaded onto a dump truck and transported to a port or other unloading site. Work is done.

  A dump truck used for such a work of transporting minerals, etc. includes a self-propelled vehicle body having front wheels and a rear wheel, and a loading platform (see FIG. And a cab that is positioned on the front side of the loading platform and that defines a cab inside is provided on the upper end side of the vehicle body. In this case, since the dump truck travels with a large amount of minerals loaded on the loading platform, the entire vehicle body is enlarged, and the cab provided on the upper end side of the vehicle body is located at a position that is largely separated upward from the ground. Is arranged.

  For this reason, a step-like boarding / exiting step for getting on and off the cab is usually provided obliquely on the front side of the body of the dump truck, and the operator can use the boarding / exiting step to get on the ground and the cab. To get on and off safely (see Patent Document 1).

  Here, since the large dump truck described above has a heavy vehicle body weight, for example, when performing maintenance work such as maintenance and inspection on the suspension device provided between the vehicle body and the wheel, the loading platform is removed from the vehicle body. In this state, it is necessary to lift the front end side and the rear end side of the vehicle body using two cranes.

  In this case, a hook member is provided on the lower surface side of the front end of the frame constituting the body of the dump truck, and one end side of the rope is attached to the hook member, and the other end side of the rope is attached by a crane. By lifting, the front end side of the vehicle body can be lifted. On the other hand, on the rear end side of the frame constituting the vehicle body, a bracket for rotatably supporting the loading platform is provided via a pin, and one end side of the rope is attached to the bracket and the other end side of the rope is connected to the crane. The rear end side of the vehicle body can be lifted by lifting by means of.

JP 2010-30581 A

  By the way, when the dump truck is lifted using a crane, the other end of the rope having one end attached to the hook member of the vehicle body is led out from the hook member to the front end side of the vehicle body, and then the front end side of the vehicle body. Is attached to the crane's hanging hook.

  However, a boarding step that extends obliquely upward from the ground toward the cab is usually attached to the front end side of the dump truck. For this reason, as described above, one end of the rope is attached to the hook member to lift the front end side of the vehicle body, and when the other end side of the rope is led upward along the front end side of the vehicle body, There is a problem that the rope interferes with the step for getting on and off.

  For this reason, when lifting the vehicle body using a crane in order to perform maintenance work on the suspension device, etc., a step for getting on and off arranged on the front end side of the vehicle body at the stage before attaching the lifting rope to the hook member is performed. Although it is necessary to remove, the boarding / alighting step is heavy.

  As described above, in the dump truck according to the prior art, it is necessary to perform a complicated operation of removing the heavy loading / unloading step from the front end side of the vehicle body using the crane at the stage before the work of lifting the vehicle body using the crane. Thus, there is a problem that workability when lifting the vehicle body is remarkably lowered.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a construction machine that can improve workability when lifting a vehicle body using a rope.

  In order to solve the above-described problems, the present invention provides a self-propelled vehicle body having a front wheel and a rear wheel, a cargo bed that can be tilted to the vehicle body with the rear side of the vehicle as a fulcrum, and a front side of the cargo bed A cab that is provided on the vehicle body and that defines a driver's cab, and a hook member that is provided below the front end of the vehicle body and to which a rope for lifting the vehicle body is attached, The present invention is applied to a construction machine including a boarding / alighting step provided obliquely on the front side of the vehicle body for getting on and off the cab.

  The invention according to claim 1 is characterized in that the boarding / alighting step is formed by combining a pair of vertical plates facing each other at an interval in the front and rear directions, and a frame extending obliquely from the ground side to the cab side. And a multi-stage step board provided between the vertical plates of the frame body and serving as a scaffold for getting on and off, and the frame body is configured so that the rope is attached to the hook member when the rope is attached to the hook member. Arranged at a position passing between the vertical plates, and the tread plate disposed at a position where the rope passes between the vertical plates of the frame body is detachable from the vertical plates of the frame body It consists of a removable tread.

  The invention of claim 2 is that the detachable tread plate is detachably attached to each vertical plate of the frame using a fastener.

  According to the first aspect of the present invention, it is possible to remove only the detachable stepping plate from between the vertical plates of the frame body while the frame body constituting the boarding / alighting step is attached to the vehicle body. As described above, when the vehicle body is lifted using the rope, even when the rope attached to the hook member passes between the pair of vertical plates constituting the frame of the boarding / alighting step, between these vertical plates. The detachable treads, which are located at the positions where the ropes pass, can be removed in advance, so that the ropes attached to the hook members can reliably interfere with the treads of the boarding steps. Can be prevented. As a result, it is possible to eliminate the troublesome work of removing the entire loading / unloading step, which is a heavy object, from the vehicle body, and using the rope attached to the hook member while the frame of the loading / unloading step remains attached to the vehicle body. Since the vehicle can be lifted, workability when lifting the vehicle body can be improved.

  According to the invention of claim 2, when lifting the vehicle body using the rope attached to the hook member, the detachable tread can be easily removed from between the vertical plates of the frame by loosening the fastener. When the rope is removed from the member, the detachable tread can be easily attached between the vertical plates of the frame by fastening the fastener. Therefore, it is possible to quickly attach and detach the detachable tread plate from the frame body, and it is possible to further improve the workability when lifting the vehicle body using the rope.

It is a front view showing a dump truck to which an embodiment of the present invention is applied. It is the left view which looked at the dump truck from the arrow II-II direction in FIG. It is a perspective view which shows a dump truck in the state which removed the loading platform. It is a perspective view which shows the flame | frame of a dump truck alone. It is a principal part expansion perspective view which shows the step for boarding / alighting provided in the front-end side of a dump truck. It is a disassembled perspective view which shows the step for boarding / alighting in FIG. 5 alone. It is a front view which shows the state which lifts the dump truck which removed the loading platform using a rope. It is the left view which looked at the state which lifted the dump truck which removed the loading platform using the rope from the arrow VIII-VIII direction in FIG. It is a perspective view which shows the state which lifts the dump truck which removed the loading platform using a rope.

  Hereinafter, an embodiment of a construction machine according to the present invention will be described in detail with reference to the accompanying drawings, taking as an example a dump truck used for transporting minerals mined in a mine.

  In the figure, reference numeral 1 denotes a dump truck which is a typical example of a large construction machine. The dump truck 1 includes a self-propelled vehicle body 2 having left and right front wheels 6 and a rear wheel 8 described later, It is generally configured by a loading platform 10 (described later) mounted on the vehicle body 2 so as to be tiltable (can be undulated). The vehicle body 2 includes a frame 3, a building 13, an upper deck 15, a lower left deck 16, a lower right deck 19, a cab 21, and the like which will be described later.

  Reference numeral 3 denotes a frame serving as a base of the vehicle body 2, and the frame 3 is formed as a strong support structure forming a can-making structure as shown in FIGS. The frame 3 is roughly constituted by a base frame 4 extending in the front and rear directions, and an upper horizontal beam 5 disposed at an intermediate portion in the front and rear directions of the base frame 4.

  Here, the base frame 4 has a substantially rectangular shape and a front frame portion 4A extending in the front and rear directions, and a bifurcated shape (V shape or U shape) from the front end side of the rear frame portion 4A toward the front. Left leg portion 4B and right leg portion 4C that are expanded and extended, a front connecting beam portion 4D that connects the front ends of the leg portions 4B and 4C in the left and right directions, and the lengths of the leg portions 4B and 4C. Left strut portion 4E and right strut portion 4F projecting upward from a middle position in the vertical direction (front and rear directions), and left and right cylinders projecting in a mountain shape downward from the front side of rear frame portion 4A The mounting portion 4G (only the left side is shown) and a pair of left and right loading platform mounting portions 4H projecting from the rear end portion of the rear frame portion 4A are configured.

  An engine (not shown) is disposed between the left and right leg portions 4B and 4C, and a building 13 (to be described later) is mounted on the left and right leg portions 4B and 4C. Further, a left lower deck 16 described later is attached to the left side surface of the left leg portion 4B, and a lower right deck 19 described later is attached to the right side surface of the right leg portion 4C. On the other hand, left and right hook members 24, which will be described later, are attached to the lower surface of the front connecting beam portion 4D, and upper horizontal beams 5, which will be described later, are disposed on the upper ends of the left and right columns 4E and 4F. It has become. Further, a hoist cylinder 12 described later is mounted on the left and right cylinder mounting portions 4G, and a loading platform 10 described later is mounted on the left and right cargo mounting portions 4H.

  Reference numeral 5 denotes an upper horizontal beam constituting the frame 3 together with the base frame 4. The upper horizontal beam 5 is formed in a hollow prismatic shape extending in the left and right directions, and is attached to the upper ends of the left and right columns 4E and 4F constituting the base frame 4. The upper horizontal beam 5 extends to the left and right from the respective pillars 4E and 4F of the base frame 4 and supports an upper deck 15, a cab 21, a control cabinet 22 and the like, which will be described later, from the lower side.

  Next, 6 is a left and right front wheel that is rotatably provided on the front side of the vehicle body 2, and each front wheel 6 constitutes a steering wheel that is steered (steered) by an operator of the dump truck 1. It is. The left and right front wheels 6 are formed with a tire diameter (outer diameter size) of, for example, 2 to 4 meters, as with a rear wheel 8 described later.

  Reference numeral 7 denotes a pair of left and right front wheel side suspensions that support the front wheel 6 with respect to the vehicle body 2 (only the left side is shown in FIG. 1). The front wheel side suspension 7 is constituted by, for example, a hydraulic shock absorber or the like, and is attached between the frame 3 and the front wheel 6 so as to be extendable and contractible. The front wheel side suspension 7 buffers the vibration transmitted to the front side of the vehicle body 2 even if the front wheel 6 vibrates due to unevenness of the road surface.

  Reference numeral 8 denotes left and right rear wheels rotatably provided on the rear side of the vehicle body 2, and each rear wheel 8 constitutes a drive wheel of the dump truck 1 and is rotationally driven by a travel drive device (not shown). It is what is done. A rear wheel side suspension 9 made of, for example, a hydraulic shock absorber or the like is provided between the rear portion of the frame 3 and the rear wheel 8, and the rear wheel side suspension 9 is rear wheel like the front wheel side suspension 7. The vibration of 8 is transmitted to the rear side of the vehicle body 2 is buffered.

  Next, reference numeral 10 denotes a cargo bed (vessel) mounted on the vehicle body 2 so as to be tiltable. The cargo bed 10 receives a large amount of minerals mined by, for example, a hydraulic excavator (not shown). The loading platform 10 is formed as a large container having a total length of 10 to 14 meters in order to load a large amount of minerals and the like.

  Here, the rear bottom portion of the loading platform 10 is rotatably connected to the left and right loading platform mounting portions 4H provided on the rear end side of the base frame 4 via the connection pins 11 and the like. Further, on the front portion side of the loading platform 10, a flange portion 10A extending horizontally from the upper end portion thereof to the front is integrally provided, and this flange portion 10A will be described later in a state where a cab 21 described later is covered from above. It extends to the vicinity of the front end portion of the upper deck 15.

  Reference numeral 12 denotes a hoist cylinder (only one is shown in FIG. 1) for tilting the loading platform 10 up and down with respect to the vehicle body 2, and each hoist cylinder 12 is composed of, for example, a multistage hydraulic cylinder, 4 and the loading platform 10 are extendable. In this case, the lower end side (rod side) of the hoist cylinder 12 is rotatably attached to the cylinder mounting portion 4G of the base frame 4, and the upper end side (tube side) of the hoist cylinder 12 is turned to the lower surface side of the loading platform 10. It is mounted movably.

  Therefore, when the hoist cylinder 12 is extended or reduced, the front side of the cargo bed 10 is turned up and down with the connecting pin 11 as a fulcrum, and the front side of the cargo bed 10 is lifted upward. In this configuration, minerals and the like loaded on the loading platform 10 can be discharged.

  Next, reference numeral 13 denotes a building provided on the front end side of the frame 3, and the building 13 constitutes a part of the vehicle body 2 together with the frame 3 and the like. Here, the building 13 includes a left side plate 13A erected on the left leg 4B of the base frame 4 and a right side plate 13B erected on the right leg 4C of the base frame 4 and facing the left side plate 13A with a gap. And an upper surface plate 13C spanned between the upper ends of the left and right side plates 13A and 13B, and a quadrangle surrounded by the left and right side plates 13A and 13B and the upper surface plate 13C. It is formed in a frame shape.

  And in the inside of the building 13, it becomes the structure by which the heat exchange apparatuses 14, such as a radiator, are accommodated. On the other hand, the building 13 also serves to support an upper deck 15, a cab 21 and the like, which will be described later, from the lower side in cooperation with the upper horizontal beam 5 constituting the frame 3. Further, a frame body 26 of a step 25 for getting on and off, which will be described later, is attached to the front end side of the building 13.

  Reference numeral 15 denotes an upper deck disposed on the upper side of the building 13, and the upper deck 15 constitutes a part of the vehicle body 2 together with the building 13 and the like. Here, the upper deck 15 has a flat plate shape extending in the horizontal direction, and is supported from below by the building 13 and the upper horizontal beam 5 of the frame 3, so that the upper deck 15 is positioned above the left and right front wheels 6. Has been placed. The upper deck 15 forms a flat passage surface on the building 13, and a cab 16, a control cabinet 22, a grid box 23, and the like, which will be described later, are installed on the upper deck 15.

  A front handrail 15A is provided on the front end side of the upper deck 15, a left handrail 15B is provided on the left end side, and a right handrail 15C is provided on the right end side. Each of the handrails 15A, 15B, and 15C surrounds the outer periphery of the upper deck 15 to ensure safety when performing maintenance work or the like on the upper deck 15.

  Reference numeral 16 denotes a lower left deck attached to the front end side of the left leg portion 4B constituting the base frame 4, and the lower left deck 16 constitutes a part of the vehicle body 2 together with the base frame 4 and the like. Here, the lower left deck 16 is a flat box having a rectangular shape when viewed from above, and its front end face 16A protrudes forward from the front end face 4D1 of the front connecting beam portion 4D constituting the base frame 4. In this state, the base frame 4 is attached to the left leg 4B.

  The lower left deck 16 constitutes a landing between the ground and the upper deck 15, and a lower ladder 17 extending toward the ground is provided on the lower surface side of the lower left deck 16, and the lower left deck On the upper surface side of 16, an upper ladder 18 that rises toward the upper deck 15 is provided. Further, on the upper surface side of the lower left deck 16, a handrail 16 </ b> B for gripping when the lower ladder 17 is raised and lowered is provided.

  Reference numeral 19 denotes a lower right deck attached to the front end side of the right leg 4C constituting the base frame 4. The lower right deck 19 constitutes a part of the vehicle body 2 together with the base frame 4 and the like. . Here, the lower right deck 19 is formed of a flat box having a trapezoidal shape when viewed from above, and its front end surface 19A projects forward from the front end surface 4D1 of the front connecting beam portion 4D constituting the base frame 4. In this state, the base frame 4 is attached to the right leg 4C.

  The lower right deck 19 constitutes a landing between the ground and the upper deck 15, and a lower ladder 20 extending toward the ground is provided on the lower surface side of the lower right deck 19. . Further, on the upper surface side of the lower right deck 19, a handrail 19 </ b> B for gripping when the lower ladder 20 is raised and lowered is provided.

  Next, 21 is a cab located on the front side of the loading platform 10 and provided on the left side of the upper end of the vehicle body 2. The cab 21 is disposed on the upper deck 15 and is formed by the upper cross beam 5 of the frame 3 and the building 13. Supported from below. The cab 21 defines a driver's cab in which an operator enters the cab 21. The cab 21 includes a driver's seat, a steering handle, a start switch, an accelerator pedal, a brake pedal, and an operation lever (all of them). Etc.) are provided.

  A control cabinet 22 is provided on the right side of the cab 21 and provided at the center of the upper end of the vehicle body 2. The control cabinet 22 is arranged on the upper deck 15 and is lowered by the upper cross beam 5 of the frame 3 and the building 13. Supported from the side. The control cabinet 22 includes an inverter that controls the motor and a control panel that controls the current generated by a generator (not shown) provided in the engine and the engine speed.

  Reference numeral 23 denotes a grid box provided on the right side of the upper end of the vehicle body 2 along the right side of the control cabinet 22. The grid box 23 is arranged on the upper deck 15, Supported from below. And the grid box 23 comprises the apparatus which consists of the resistor which consumes direct-current power at the time of deceleration of a vehicle, and the blower which cools the resistor.

  Reference numeral 24 denotes left and right hook members provided on the lower end side of the vehicle body 2. These left and right hook members 24 are used to lift the vehicle body 2 of the dump truck 1 using a wire rope. The one end side is attached. The hook member 24 is disposed on both left and right ends of the front connecting beam portion 4D constituting the base frame 4, and is fixed to the lower surface of the front connecting beam portion 4D.

  Here, for example, as shown in FIGS. 7 and 8, when lifting the vehicle body 2 of the dump truck 1 with the loading platform 10 removed, two cranes 101 and 102 are prepared. A method is used in which the rear side of the vehicle body 2 is lifted by a wire rope 103 attached to one crane 101 and the front side of the vehicle body 2 is lifted by a wire rope 104 attached to the other crane 102.

  In this case, when lifting the rear side of the vehicle body 2, one end side of two wire ropes 103 (only one is shown in FIG. 7) is attached to the left and right loading platform mounting portions 4 </ b> H of the base frame 4. Then, the other end side of the wire rope 103 is vertically extended and attached to the crane 101.

  On the other hand, when lifting the front side of the vehicle body 2, as shown in FIG. 8, one end side of the two wire ropes 104 is attached to the left and right hook members 24, respectively. Then, the other end side of each wire rope 104 is pulled out in front of the hook member 24, passed through the lower surface of the front connection beam portion 4 </ b> D of the base frame 4, and then led upward along the front end portion of the building 13. It is configured to be attached to the crane 102. Here, when the wire rope 104 having one end attached to the hook member 24 is led upward via the front connection beam portion 4D of the base frame 4, a rear longitudinal plate 26A of the frame 26 described later and It is configured to pass between the front vertical plate 26B.

  Next, the boarding / alighting steps used in the present embodiment will be described.

  Reference numeral 25 denotes a boarding / alighting step provided on the front side of the vehicle body 2. The boarding / alighting step 25 constitutes a scaffold when an operator or the like gets on and off the cab 21 and crosses the front of the heat exchange device 14. Are formed in a step shape extending obliquely upward from the lower right deck 19 toward the cab 21. Here, as shown in FIGS. 5 and 6, the getting-on / off step 25 includes a frame body 26, a detachable tread plate 29, and a fixed tread plate 31.

  Reference numeral 26 denotes a frame that forms an outer shell of the step 25 for getting on and off. The frame 26 includes a flat rear longitudinal plate 26A that extends obliquely upward from the lower right deck 19 toward the cab 21, and the rear vertical plate 26A. A front vertical plate 26B facing the rear vertical plate 26A with a certain distance in the front and rear directions, a lower end portion of the rear vertical plate 26A, and a lower end portion of the front vertical plate 26B. It is formed by combining the connecting plate 26C for connecting the two.

  Here, as shown in FIG. 5 and FIG. 6, a fixed step plate 31, which will be described later, is fixedly provided at an intermediate portion in the upper and lower directions of the rear vertical plate 26A and the front vertical plate 26B. On the other hand, on the lower end side of the rear vertical plate 26A and the front vertical plate 26B, a plurality of stepping plate mounting plates 26D formed of angle steel or the like are attached to the lower and upper sides of the rear vertical plate 26A and the front vertical plate 26B. Welded at equal intervals in the direction. In addition, in order to attach a later-described three-stage detachable stepping plate 29 to the upper end side of the rear vertical plate 26A and the front vertical plate 26B, a large number of stepping plate mounting plates 26D formed of angle steel or the like are provided on the upper and lower sides. Welded at equal intervals in the direction.

  As shown in FIG. 5, the upper end sides of the rear vertical plate 26A and the front vertical plate 26B are attached to the upper surface plate 13C of the building 13 via the bracket 27, and the connecting plate 26C is connected to the lower right deck 19 with a bolt 28. The frame body 26 is fixed to the front end side of the vehicle body 2 in a state of extending obliquely upward from the lower right deck 19 toward the cab 21.

  Next, reference numeral 29 denotes a multi-stage detachable tread plate detachably provided between the rear vertical plate 26A and the front vertical plate 26B of the frame body 26. Each detachable tread plate 29 is a fixed tread plate 31 described later. At the same time, it forms a scaffold when the operator gets on and off the step 25 for getting on and off. In the present embodiment, the detachable tread plate 29 constitutes a total of six steps of tread plates, that is, three steps on the lower end side of the step 25 for getting on and off and three steps on the upper end side.

  Here, as shown in FIG. 6, the detachable tread plate 29 is formed of a rectangular plate body whose left and right end sides are bent downward, and has a non-slip uneven portion formed on the upper surface thereof. Yes. Note that one of the six steps of the detachable tread plate 29 located at the uppermost step has a wide width in the left and right directions, and is a substantially square plate as a whole. Then, bolts 30 as fasteners are inserted into the four corners of the detachable tread plate 29, and the tread plate mounting plate 26D is secured to the rear vertical plate 26A and the front vertical plate 26B of the frame 26 with the bolt 30. Each detachable tread plate 29 can be attached to and detached from the rear vertical plate 26A and the front vertical plate 26B of the frame body 26 by being screwed together.

  In this case, the arrangement position of each detachable tread plate 29 attached to the frame body 26 is set as follows.

  That is, as shown in FIGS. 7 to 9, when lifting the front side of the vehicle body 2 using the crane 102 and the wire rope 104, the left and right hook members are connected to one end side of the two wire ropes 104. 24, the other end side of the wire rope 104 is led upward along the front end portion of the building 13 and attached to the crane 102. At this time, the intermediate portion of the wire rope 104 is The frame 26 passes between the rear vertical plate 26A and the front vertical plate 26B. Therefore, as shown in FIG. 8, the two wire ropes 104 attached to the hook member 24 are disposed in the area where the wire 26 passes between the rear vertical plate 26A and the front vertical plate 26B of the frame body 26 and the periphery thereof. The six-step tread plate is configured as a detachable tread plate 29.

  Therefore, as shown in FIG. 8, when the front side of the vehicle body 2 is lifted using the crane 102 and the wire rope 104, the removable tread 29 is previously removed from the rear vertical plate 26 </ b> A and the front vertical plate 26 </ b> B of the frame body 26. By removing the wire rope 104, the wire rope 104 can pass between the rear vertical plate 26 </ b> A and the front vertical plate 26 </ b> B without interfering with each detachable tread plate 29. On the other hand, after the lifting operation of the vehicle body 2 is completed and the wire rope 104 is removed from the hook member 24, each detachable step plate 29 is used with bolts 30 for the rear vertical plate 26A and the front vertical plate 26B of the frame body 26. And can be easily installed.

  Reference numeral 31 denotes a multi-stage fixed tread plate fixedly provided between the rear vertical plate 26A and the front vertical plate 26B of the frame body 26. These fixed tread plates 31 are arranged in the upper and lower directions of the boarding step 25. A five-step tread plate located in the middle is formed.

  Here, similarly to the detachable tread plate 29, the fixed tread plate 31 is formed of a rectangular plate body in which both left and right ends are bent downward and an anti-slip uneven portion is formed on the upper surface. The fixed foot plate 31 is fixed to the rear vertical plate 26A and the front vertical plate 26B of the frame body 26 by means such as welding.

  In this case, the arrangement positions of the fixed treads 31 attached to the frame body 26 are set as follows.

  That is, as shown in FIG. 8, when lifting the front side of the vehicle body 2 using the crane 102 and the wire rope 104, the two wire ropes 104 attached to the hook member 24 are connected to the rear of the frame body 26. When passing between the vertical plate 26 </ b> A and the front vertical plate 26 </ b> B, a position separated from the region through which the two wire ropes 104 pass, for example, a five-step stepping plate positioned between the two wire ropes 104. The fixed tread 31 is configured.

  Each fixed tread 31 is always fixed between the rear vertical plate 26A and the front vertical plate 26B of the frame 26 regardless of the lifting work of the vehicle body 2, and maintains the strength of the entire boarding step 25. In addition, the detachable tread plate 29 functions as a working scaffold when the detachable tread plate 29 is attached to and detached from the frame body 26.

  Reference numeral 32 denotes a handrail provided on the frame body 26. The handrail 32 is provided on the front vertical plate 26B of the frame body 26 and extends over substantially the entire length of the front vertical plate 26B. And the handrail 32 ensures the safety at the time of getting on and off, when the operator etc. which get on and off the step 25 for getting on / off hold.

  The dump truck 1 according to the present embodiment has the above-described configuration. When the dump truck 1 is used to carry a mineral or the like, first, it is fixed to the front end side of the vehicle body 2 as shown in FIG. By attaching a six-stage detachable tread plate 29 to the frame 26 of the step 25 for getting on / off, the step 25 for getting on / off having a detachable tread plate 29 of six steps and a fixed tread plate 31 of five steps is installed.

  Thus, the operator can climb up to the upper deck 15 quickly and safely from the lower right deck 19 using the step 25 for getting on and off as a foothold after climbing on the lower right deck 19 from the ground. You can move up and get into the cab 21.

  An operator who has entered the cab 21 operates the dump truck 1 to travel to a mining site such as a mine, and loads minerals mined by a hydraulic excavator (not shown) on the loading platform 10.

  Then, after the dump truck 1 loaded with a large amount of minerals on the loading platform 10 travels to the unloading site, the hoist cylinder 12 is extended to rotate the loading platform 10 upward with the connecting pin 11 as a fulcrum. Thereby, the mineral etc. which were loaded on the loading platform 10 can be discharged | emitted to a collection place.

  Next, for example, a work for lifting the vehicle body 2 of the dump truck 1 in order to perform a maintenance work on the front wheel side suspension 7 and the rear wheel side suspension 9 mounted on the dump truck 1 will be described.

  When performing maintenance work on the front wheel side suspension 7 and the rear wheel side suspension 9, first, as shown in FIG. 5, the frame body 26 constituting the step 25 for getting on and off is fixed to the front end side of the vehicle body 2, Only the six-stage detachable tread plate 29 is removed from the frame body 26. That is, as shown in FIG. 6, the bolts 30 are removed from the tread plate mounting plate 26 </ b> D fixed to the rear vertical plate 26 </ b> A and the front vertical plate 26 </ b> B of the frame body 26 to be arranged on the lower end side and upper end side of the frame body 26. The six-stage detachable tread plate 29 is removed from between the rear vertical plate 26A and the front vertical plate 26B, and only the five-step fixed tread plate 31 is fixed to the frame body 26.

  In this state, as shown in FIGS. 7 to 9, the loading platform 10 is removed from the dump truck 1, and the rear side of the vehicle body 2 of the dump truck 1 is lifted by a wire rope 103 attached to one crane 101. The two front sides are lifted by a wire rope 104 attached to the other crane 102.

  In this case, when lifting the rear side of the vehicle body 2, one end sides of the two wire ropes 103 are respectively attached to left and right cargo bed mounting portions 4 H provided on the rear end side of the base frame 4. The other end side is extended vertically upward and attached to the crane 101.

  On the other hand, when lifting the front side of the vehicle body 2, as shown in FIG. 8, one end side of the two wire ropes 104 is attached to the left and right hook members 24 provided on the front end side of the base frame 4, respectively. The other end of each wire rope 104 is pulled out forward of the hook member 24, passed through the lower surface of the front connecting beam portion 4D of the base frame 4, and then led upward along the front end portion of the building 13. Attach to 102.

  Here, when the wire rope 104 having one end attached to the hook member 24 is led upward via the front connection beam portion 4D of the base frame 4, a rear longitudinal plate 26A of the frame 26 described later and The six-stage detachable tread plate 29 that has passed between the front vertical plate 26B but is disposed in the region through which the wire rope 104 passes has already been removed from the frame body 26. For this reason, the wire rope 104 hung between the hook member 24 and the crane 102 does not interfere with each detachable stepping plate 29, and between the rear vertical plate 26A and the front vertical plate 26B of the frame 26. Can pass through.

  In this manner, the wire rope 103 attached to the left and right cargo bed attaching portions 4H provided on the rear end side of the base frame 4 is attached to one crane 101, and the hook member 24 provided on the front end side of the base frame 4 is provided. By simultaneously winding the wire ropes 103 and 104 while the wire rope 104 attached to the other crane 102 is attached, the vehicle body 2 can be lifted in a stable posture.

  Thus, according to the present embodiment, the boarding / alighting step 25 is detachable between the frame 26 fixed to the vehicle body 2 and the rear vertical plate 26A and the front vertical plate 26B constituting the frame 26. The detachable tread plate 29 is provided, and a fixed tread plate 31 fixed between the rear vertical plate 26A and the front vertical plate 26B.

  Therefore, when the front side of the vehicle body 2 is lifted using the wire rope 104, the wire rope 104 attached to the hook member 24 provided on the front end side of the vehicle body 2 is attached to the rear vertical plate 26A of the frame body 26. Even when it is attached to the crane 102 through the space between the front vertical plate 26B and the front vertical plate 26B, by removing the detachable tread plate 29 disposed in the region through which the wire rope 104 passes from the frame body 26 in advance, It is possible to reliably prevent the detachable tread plate 29 from interfering with the wire rope 104 and being damaged. As a result, it is possible to eliminate the troublesome work of removing the entire boarding step 25, which is a heavy object, from the vehicle body 2, and with the frame body 26 and the fixed tread 31 of the boarding step 25 attached to the vehicle body 2, Since the front side of the vehicle body 2 can be lifted using the wire rope 104 attached to the hook member 24, workability when lifting the vehicle body 2 can be improved.

  Further, since the detachable tread plate 29 is attached to the tread plate mounting plate 26D of the frame body 26 using the bolts 30, the detachable tread plate 29 is attached using the fixed tread plate 31 always fixed to the frame body 26 as a working scaffold. The removal work can be performed quickly and easily.

  In the above-described embodiment, five stages of fixed treads 31 are arranged on the upper and lower intermediate portions of the frame 26 constituting the boarding step 25, and a total of six are provided on the lower end side and the upper end side of the frame body 26. The case where the stepped detachable tread 29 is arranged is illustrated. However, the present invention is not limited to this, and for example, all the footboards constituting the step for getting on and off may be constituted by detachable footboards.

DESCRIPTION OF SYMBOLS 1 Dump truck 2 Car body 3 Frame 6 Front wheel 8 Rear wheel 10 Loading platform 21 Cab 24 Hook member 25 Step for getting on / off 26 Frame 26A Rear vertical plate 26B Front vertical plate 29 Detachable tread (tread)
30 bolts (fasteners)
31 Fixed footboard
103,104 wire rope

Claims (2)

A self-propelled vehicle body having a front wheel and a rear wheel; a cargo bed provided to be tiltable to the vehicle body with the rear side of the vehicle body as a fulcrum; and an interior provided on the vehicle body located on the front side of the cargo bed A cab defining a driver's cab, a hook member provided below the front end of the vehicle body, to which a rope for lifting the vehicle body is attached, and a front side of the vehicle body for getting on and off the cab In a construction machine comprising a boarding / alighting step provided obliquely at
The boarding / alighting step is formed by combining a pair of vertical plates facing each other in the front and rear directions and extending obliquely from the ground side to the cab side, and between each vertical plate of the frame body Consists of a multi-stage stepping board that serves as a foothold when getting on and off,
The frame is disposed at a position where the rope passes between the vertical plates when the rope is attached to the hook member.
The step board disposed at a position through which the rope passes among the vertical plates of the frame body is constituted by a detachable step board that can be attached to and detached from the vertical plates of the frame body. Construction machinery.   The construction machine according to claim 1, wherein the detachable tread is configured to be detachably attached to each vertical plate of the frame using a fastener.

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