Construction machine

Abstract

To provide a construction machine equipped with a supply tank mounting platform that can reduce workload of an operator who handles a supply tank.SOLUTION: A floor frame 28 framed on one side of an upper rotating body is provided with a supply tank mounting platform 36 on which a supply tank 35 used for supplying a liquid reducing agent is placed near a liquid supply port 31b of a reducing agent tank 31. The supply tank mounting platform has: a mounting plate 37 on which the supply tank is mounted; an arm 38 with which the mounting plate is provided; and a base 39 that supports the arm so as to rotate around a rotation axis extending in a longitudinal direction of the upper rotating body. The supply tank mounting platform is configured such that, by rotating the arm relative to the base fixed to the floor frame, a posture thereof can be changed between a stored state of being stored inside an opening 34 of a house 30 and a deployed state of being deployed outside the opening with the mounting plate set horizontally.SELECTED DRAWING: Figure 17

Description

Technical Field

[0001] The present invention relates to construction machinery, and more particularly to construction machinery provided with a reductant tank for storing a liquid reductant for reducing nitrogen oxides in exhaust gas.

Background Art

[0002] Construction machinery such as pile drivers, cranes, and hydraulic excavators are equipped with exhaust gas purification devices that comply with exhaust gas regulations. Among these types of exhaust gas purification devices, there is a selective reduction type catalyst device (SCR) that uses aqueous urea as a liquid reductant, which highly purifies nitrogen oxides (NOx) in exhaust gas by means of an SCR catalyst. The reductant tank storing aqueous urea is installed, for example, on one side of the slewing frame on which the engine is mounted, in consideration of daily maintenance such as water supply, and in this installed state, it is housed inside a box body such as a house that can be concealed from the outside (see, for example, Patent Documents 1 and 2).

[0003] For example, as shown in FIGS. 18 and 19, the reductant tank 100 provided on the upper slewing body of a pile driver has a substantially rectangular parallelepiped tank body 100a adjacent to auxiliary machines such as the cooling device 102 of the engine 101 and the fuel tank 103 in the front-rear direction of the upper slewing body (the left-right direction in FIG. 18), and the lower half of the tank body 100a is installed in a form that is submerged in the upper surface 104a of a floor frame 104 formed by framing steel materials (channels). On the upper part of the side surface (the lower side in FIG. 19) of the tank body 100a, a liquid supply port 100b to which a cap 105 can be detachably attached is provided. The reductant tank 100 installed in this way can be easily accessed to the liquid supply port 100b by opening a door 107 corresponding to the position of the reductant tank 100 on the outer surface of the house 106 when performing the replenishment operation of aqueous urea.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] When performing the urea water replenishment work on site, the operator performing this work usually needs to hold the replenishment tank storing urea water with both hands. However, the conventionally used BIB (Bag-in-Box) type replenishment tank has a capacity of, for example, about 20 L and is heavy, imposing a very large burden on the operator.

[0006] Therefore, an object of the present invention is to provide a construction machine equipped with a replenishment tank mounting base that can reduce the work burden on the operator handling the replenishment tank.

Means for Solving the Problems

[0007] To achieve the above object, the construction machine of the present invention is provided with an upper swing body rotatably provided on the upper part of a lower traveling body, and on a floor frame framed on one side of the upper swing body, a reducing agent tank for storing a liquid reducing agent that treats the exhaust gas of an engine and a house for concealing the reducing agent tank from the outside are respectively installed. In the construction machine, the house includes an opening facing the outside the liquid supply port of the reducing agent tank and a door capable of opening and closing the opening. The floor frame is provided with a replenishment tank mounting base for placing a replenishment tank used when replenishing the liquid reducing agent near the liquid supply port of the reducing agent tank. The replenishment tank mounting base has a mounting plate for mounting the replenishment tank, an arm on which the mounting plate is provided, and a base for rotatably supporting the arm about a rotation axis extending in the front-rear direction of the upper swing body. By rotating the arm with respect to the base fixed to the floor frame, it is configured to be able to change its posture between a stored state stored inside the opening and a deployed state with the mounting plate made horizontal and deployed outside the opening.

[0008] In addition, a deployment stopper is provided between the floor frame and the arm to hold the supply tank mounting base in the deployed state. The arm has a first arm portion provided with the rotation shaft and a second arm portion perpendicular to the first arm portion, and the deployment stopper is an elastic body pressed between the floor frame and the second arm portion.

[0009] Furthermore, the base is provided with a storage stopper against which the arm abuts to hold the supply tank mounting base in the stored state. In addition, the mounting plate is provided with a notch formed by cutting a part of the material, and the notch includes, in the stored state of the supply tank mounting base, a part of the material that projects the cap of the liquid supply port in the attachment / detachment direction and overlaps the material as a cutting target.

Advantages of the Invention

[0010] According to the construction machine of the present invention, the supply tank mounting base provided on the floor frame changes its posture between a stored state in which it is stored inside the opening of the house as the arm rotates and a deployed state in which the mounting plate is made horizontal and deployed outside the opening. Therefore, it is possible to place the supply tank near the liquid supply port of the reducing agent tank with a simple operation of just deploying the supply tank mounting base, and the work burden of the operator handling the supply tank can be reduced. Moreover, the return to the stored state can be performed promptly, and since the exterior functions of the house and the door are maintained in the stored state, it contributes to the smooth operation of the construction machine.

[0011] In addition, as components of the arm, it has a first arm portion provided with a rotation axis and a second arm portion perpendicular to the first arm portion. Therefore, when shifting from the stored state to the deployed state, the tip of the arm, that is, the second arm portion, can be arranged along the outer surface of the floor frame without contacting the door frame. That is, while avoiding damage and deformation that would impair the function of the door frame, the rigid floor frame can reliably receive the rotational force of the arm. Moreover, since the deployment stopper is an elastic body pressed between the floor frame and the second arm portion, it is possible to effectively prevent the generation of impact sounds caused by contact between metals and the peeling of paint.

[0012] Furthermore, in the base, since a storage stopper is provided against which the arm abuts to hold the replenishment tank mounting base in the stored state, it is possible to prevent contact between the replenishment tank mounting base and the reductant tank, and to realize a replenishment tank mounting base that is inexpensive and excellent in compactness. In addition, since the notch provided in the mounting plate includes, in the stored state of the replenishment tank mounting base, the portion that projects in the attachment / detachment direction of the cap of the liquid supply port and overlaps the material to be cut, the cap can be attached and detached even in the stored state, and it can be dealt with in the same way as before at a site where urea water replenishment facilities (for example, pumps) are installed.

Brief Description of the Drawings

[0013]

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DETAILED DESCRIPTION OF THE INVENTION

[0014] FIGS. 1 and 17 show an example of an embodiment in which the present invention is applied to a pile driver, which is an example of a construction machine. As shown in FIG. 1, the pile driver 11 includes a base machine 15 composed of a lower traveling body 12 equipped with crawlers and an upper revolving body 14 rotatably provided on the lower traveling body 12 via a slewing bearing 13, a leader 16 erected at the front of the upper revolving body 14, and a leader hoisting cylinder 17 that supports the leader 16 from the rear. Further, a leader support 18 that supports the leader 16 so as to be able to rise and fall is provided at the front of the upper revolving body 14, and a pipe guide arm 19 that supports pipes is provided above the front of the upper revolving body 14. In addition, stabilizing jacks 20 are provided at four locations on the front, rear, left, and right of the upper revolving body 14, and a counterweight 21 for balancing the pile driver 11 is mounted at the rear end of the upper revolving body 14.

[0015] The leader 16 is formed by detachably connecting a plurality of leader members to each other. A top sheave 22 is attached to the upper end portion, and a lower guide 23 is attached to the lower end portion. An auger 24, which is an example of a working device, is mounted on the front surface of the leader 16 so as to be able to move up and down. The auger 24 is rotationally driven by hydraulic pressure and applies a rotational force to a construction member (for example, a steel pipe pile) connected to the output shaft.

[0016] Above and below the auger 24, both ends of a hoisting chain 27 spanned between a drive sprocket 25 provided at the lower end portion of the leader 16 and a driven sprocket 26 provided at the upper end portion are respectively attached, constituting a chain-type hoisting device. The hoisting device rotationally drives the drive sprocket 25 by hydraulic pressure and moves the hoisting chain 27 wound around the drive sprocket 25 and the driven sprocket 26 in the vertical direction, thereby raising and lowering the auger 24 along the front surface of the leader 16.

[0017] The upper swing body 14 has a frame body in which a rectangular box-shaped main frame to which a swing bearing 13 is attached on the lower surface and floor frames 28 (the opposite side is not shown) provided on both sides in the width direction of the upper swing body of the main frame are integrally coupled. A driver's cab 29 for performing operations such as driving the auger 24, the upper swing body 14, and the lower traveling body 12 is installed at the front portion on the right floor frame. Further, an equipment housing (not shown) for housing a hydraulic oil tank and the like is provided at the rear portion on the right floor frame. On the other hand, an engine housing 30 (hereinafter simply referred to as a housing) for housing an engine for driving a hydraulic pump and an exhaust gas purification device attached thereto is provided on the left floor frame 28.

[0018] The exhaust gas purification device has, although not shown in the drawings, an SCR (Selective Catalytic Reduction) using urea water as a reducing agent, an injection nozzle that is arranged upstream of the SCR in the exhaust pipe and injects urea water toward the exhaust gas in the exhaust pipe, and the like. As a result, the exhaust gas after combustion is guided to the exhaust pipe and discharged to the outside through the exhaust port after being purified by the exhaust gas purification device.

[0019] Auxiliary equipment related to the engine and the exhaust gas purification device, such as a fuel tank for storing fuel and a reducing agent tank for storing urea water, has the same configuration and arrangement relationship as in the conventional case as shown in FIGS. 18 and 19. Also, the floor frame 28 and the house 30 that conceals the auxiliary equipment installed thereon from the outside basically have the same configuration and arrangement relationship as in the conventional case. Since urea water is consumed at a ratio corresponding to the consumption of fuel, usually, urea water and fuel are replenished at the same timing.

[0020] As shown in FIGS. 2 and 3, the floor frame 28 is formed by framing a steel material (channel) having a U-shaped cross section into a rectangular shape in plan view, and its strength and rigidity are enhanced by reinforcing members provided inside the frame body. The reducing agent tank 31 incorporates an electrical component for detecting the liquid level height (level) of the urea water stored in the tank body 31a, and the lower half of the tank body 31a is buried and installed with respect to the upper surface 28a of the floor frame. The tank body 31a is formed in a substantially rectangular parallelepiped shape, and a cap 32 is detachably provided at the liquid supply port 31b inclined outward at the upper part of the side surface (the outer side surface in the width direction of the upper swing body (right side in FIG. 3)).

[0021] The house 30 is composed of a box body with a sheet metal structure having an open lower end, and in a state of being installed on the upper surface 28a of the floor frame 28, it is aligned with the positions of the outer edges (front, rear, left, and right four sides) of the floor frame 28. As a result, the outer side surface 28b of the floor frame 28 and the outer side surface 30a of the house 30 are flush, and a vertical plane S passing through the outer side surfaces 28b and 30a is defined. This vertical plane S also corresponds to the width (transport width) of the upper swing body 14.

[0022] The outer surface 30a of the house 30 is provided with three openings 34 arranged side by side in the front - rear direction and opened and closed by the door 33 (see also FIG. 1). Among them, the front - most opening 34 corresponds to the position of the reducing agent tank 31. The opening 34 is formed by a door frame 30b to which a buffer material (not shown) is attached. The position of the outer surface of the closed door 33, that is, the position of the vertical surface S, becomes the opening end in the width direction of the upper rotating body (the left - right direction in FIG. 3).

[0023] When performing the replenishment operation of the aqueous urea solution, the reducing agent tank 31 installed in this way exposes the liquid supply port 31b to the outside through the opening 34 by opening the front - most door 33 in the house 30 (see also FIG. 18). Here, an operator performing the replenishment operation can easily access the liquid supply port 31b, which is just above the floor frame 28, that is, at the low position of the opening 34, from the ground. However, the replenishment tank storing the aqueous urea solution is heavy, and the working burden of holding it with both hands is very large. Therefore, as an auxiliary mechanism for reducing such a working burden, as shown in FIG. 17, the floor frame 28 is provided with a replenishment tank mounting base 36 for placing the replenishment tank 35 near the liquid supply port 31b of the reducing agent tank 31.

[0024] As shown in FIGS. 4 to 17, the replenishment tank mounting base 36 generally includes a mounting plate 37 for placing the replenishment tank 35, an arm 38 on which the mounting plate 37 is provided, and a base 39 that rotatably supports the arm 38 around a rotation axis P (FIGS. 4 and 5) extending in the front - rear direction of the upper rotating body. In this exemplary embodiment, the rotation axis P is the central axis of a connecting pin 40 that rotatably connects the arm 38 and the base 39. Thereby, the replenishment tank mounting base 36 can change its posture between a stored state (FIGS. 13 to 16) stored inside the opening 34 of the house 30 by rotating the arm 38 around the rotation axis P with respect to the base 39 fixed to the floor frame 28 with bolts 41, and a deployed state (FIGS. 10 to 12) in which the mounting plate 37 is horizontal and deployed outside the opening 34.

[0025] Further, the supply tank mounting base 36 includes a storage stopper 42 that holds the posture in the stored state and a deployment stopper 43 that holds the posture in the deployed state as posture holding members described later. The rotation range between the stored state and the deployed state obtained by functioning each of the stoppers 42 and 43 is set to, for example, 150 degrees. In this case, since the deployed state is achieved in a posture where the angle formed by the vertical plane S and the plate surface of the mounting plate 37 is 90 degrees (FIG. 6), the stored state is created in a posture where the angle formed by the vertical plane S and the plate surface of the mounting plate 37 is 60 degrees (FIG. 9).

[0026] The mounting plate 37 is a substantially rectangular plate body with rounded corners at its four corners, and is sized to be minimized to the extent necessary for placing the supply tank 35 thereon. The inner end portion of the mounting plate 37 is provided with an arc-shaped notch 37a formed by cutting a part of the material (plate material) as a cutting target D, as shown in FIG. 7 and the like. As can be seen from FIG. 16, this notch 37a includes, in the stored state of the supply tank mounting base 36, the portion where the cap 32 of the liquid supply port 31b of the reducing agent tank 31 projects in the attachment / detachment direction (the paper surface direction of FIG. 16) and overlaps the material, that is, the upper end portion of the projected circle is included in the cutting target D. By providing such a notch 37a, the mounting plate 37 and the cap 32 do not interfere with each other in the stored state of the supply tank mounting base 36, and the attachment / detachment operation of the cap 32 can be performed from that state.

[0027] The arm 38 is composed of a pair of front and rear plate bodies arranged to face each other at an interval corresponding to the front and rear width of the reducing agent tank 31, and includes a first arm portion 38a provided with a rotation shaft P (connecting pin 40) at one end, a second arm portion 38b perpendicular to the first arm portion 38a, an intermediate portion 38c that connects the other end of the first arm portion 38a and the base end portion of the second arm portion 38b in an arc shape, and a support portion 38d that extends from the second arm portion 38b toward the side opposite to the first arm portion and supports the mounting plate 37. The second arm portion 38b extends downward along the vertical plane S in the deployed state of the supply tank mounting base 36, as shown in FIG. 6 and the like, and is provided with a plate-like attachment portion 38e for attaching the deployment stopper 43 at the tip end. The pair of front and rear arms 38 and 38 formed in this way are arranged with respect to the mounting plate 37 in a centered manner when viewed facing the plate surface of the mounting plate 37 (FIG. 7).

[0028] The base 39 has a rectangular plate-shaped fixing portion 39a and a pair of front and rear standing plate portions 39b, 39b fixed to the fixing portion 39a corresponding to the front and rear intervals of the arms 38, 38. The fixing portion 39a is provided with a plurality of bolt holes 39c and is fixed by bolts 41 through a mounting seat (tap plate) 28c inside the frame of the floor frame 28, specifically, inside the channel (FIG. 10). On the other hand, the standing plate portion 39b is provided with a rotation shaft P (connecting pin 40) at its tip (upper end). In the fixed state of the base 39, as is clear from FIG. 10 and the like, the rotation shaft P is arranged at a position higher than the upper surface 28a of the floor frame 28 and close to the liquid supply port 31b of the reducing agent tank 31.

[0029] The storage stopper 42 is made of flat steel (flat bar) slightly thicker than the plate thickness of the arm 38 and is fixed to the upper end plate surface of the standing plate portion 39b. This flat steel is inclined at a set angle (for example, 60 degrees) with respect to the standing plate portion 39b, and in the storage state of the replenishment tank mounting base 36, the plate ends of the flat steel and the first arm portion 38a abut against each other uniformly (FIGS. 5 and 9). Also, in the state where the storage stopper 42 functions (storage state), as shown in FIG. 13, when viewed from the axial direction of the rotation shaft P, the intermediate portion 38c of the arm 38 and the liquid supply port 31b of the reducing agent tank 31 are arranged at overlapping positions, and the center of gravity of the replenishment tank mounting base 36 acts inside the position of the rotation shaft P. Thereby, the replenishment tank mounting base 36 is stably held in the storage state.

[0030] The deployment stopper 43 is made of an elastic body (for example, a short cylindrical rubber) interposed between the outer surface 28b of the floor frame 28 and the second arm portion 38b in the deployed state of the replenishment tank mounting base 36, and is pressed between the two 28b, 38b (FIG. 10). This elastic body is bolted to the mounting portion 38e of the second arm portion 38b and is housed in the housing 30 together with the replenishment tank mounting base 36 in the storage state (FIG. 13).

[0031] When performing the replenishment operation of the aqueous urea solution using the replenishment tank mount 36 configured as described above, first, open the door 33 of the cab 30, and expose the liquid supply port 31b of the reductant tank 31 to the outside through the opening 34. Next, perform a rotation operation on the replenishment tank mount 36 to change the posture from the stored state to the deployed state. After removing the cap 32 of the liquid supply port 31b, carry the prepared replenishment tank 35 to the replenishment tank mount 36 and place it on the placement plate 37. As a result, the replenishment tank 35 is stably placed near the liquid supply port 31b. The replenishment tank 35 is, for example, a 20L container (a cubic poly container with a side length of 30 cm) of the BIB (Bag-in-Box) type, and a dedicated nozzle is attached thereto.

[0032] Here, as shown in FIG. 17, when the replenishment tank 35 is gradually tilted with the nozzle 35a inserted into the liquid supply port 31b of the reductant tank 31, the aqueous urea solution is poured into the reductant tank 31. In this state, since the weight of the replenishment tank 35 is deposited on the replenishment tank mount 36 via the placement plate 37, the operator only needs to gently place a hand on the replenishment tank 35. After replenishing the necessary amount of the aqueous urea solution to the reductant tank 31 in this way, attach the cap 32 to the liquid supply port 31b, and perform the reverse procedure of the above procedure to complete the replenishment operation.

[0033] As described above, according to the construction machine of the present invention, the replenishment tank mount 36 provided on the floor frame 28 changes its posture between the stored state where it is stored inside the opening 34 of the cab 30 as the arm 38 rotates and the deployed state where the placement plate 37 is made horizontal and deployed outside the opening 34. Therefore, it is possible to place the replenishment tank 35 near the liquid supply port 31b of the reductant tank 31 with a simple operation of just deploying the replenishment tank mount 36, and the work burden of the operator handling the replenishment tank 35 can be reduced. Moreover, the return to the stored state can be performed promptly, and since the exterior functions of the cab 30 and the door 33 are maintained in the stored state, it contributes to the smooth operation of the construction machine.

[0034] In addition, as components of the arm 38, it has a first arm portion 38a provided with a rotation axis P and a second arm portion 38b perpendicular to the first arm portion 38a. Therefore, when shifting from the stored state to the deployed state, the tip of the arm 38, that is, the second arm portion 38b, can be arranged along the outer surface 28b of the floor frame 28 without contacting the door frame 30b. That is, while avoiding damage or deformation that may impair the function of the door frame 30b, the rigid floor frame 28 can surely receive the rotational force of the arm 38. Moreover, since the deployment stopper 43 is an elastic body pressed between the floor frame 28 and the second arm portion 38b, generation of impact noise caused by contact between metals and peeling of paint can be effectively prevented.

[0035] Furthermore, in the base 39, since a storage stopper 42 is provided where the arm 38 abuts to hold the supply tank mounting base 36 in the stored state, it is possible to realize a supply tank mounting base 36 that is inexpensive and excellent in compactness while preventing contact between the supply tank mounting base 36 and the reducing agent tank 31. In addition, the notch 37a provided in the mounting plate 37 includes a portion to be cut that projects the cap 32 of the liquid supply port 31b in the attachment / detachment direction and overlaps the material in the stored state of the supply tank mounting base 36. Therefore, the cap 32 can be attached and detached even in the stored state, and in a site where urea water supply facilities (for example, pumps) are installed, it can be handled in the same way as before.

[0036] Note that the present invention is not limited to the above-described embodiment, and the shape of the floor frame and the house, and the arrangement of auxiliary equipment such as the reducing agent tank can be appropriately changed according to the specifications of the construction machine. Further, the supply tank mounting base only needs to be able to change its posture between the stored state and the deployed state, and various modes are possible for the shape and arrangement of each member such as the mounting plate, arm, base, and stopper of the components according to the installation conditions. For example, a mode of attaching the deployment stopper to the floor frame side is conceivable, and the material, shape, arrangement, etc. of the storage stopper are also arbitrary. Furthermore, although a pile driver has been exemplified as the construction machine, the present invention is not limited thereto, and it can be applied to various construction machines equipped with an engine and its exhaust gas purification device, such as an earth drill, a crane, and a hydraulic excavator. In this case, since the fuel tank and the reducing agent tank are provided as a set for any construction machine, the mental burden (such as anxiety and tension) of the operator caused by the difference in the work load between the replenishment targets is also eliminated.

Explanation of Signs

[0037] 11…pile driver, 12…lower traveling body, 13…slewing bearing, 14…upper slewing body, 15…base machine, 16…leader, 17…leader hoisting cylinder, 18…leader support, 19…pipe guiding arm, 20…jack, 21…counterweight, 22…top sheave, 23…lower guide, 24…auger, 25…drive sprocket, 26…driven sprocket, 27…lifting chain, 28…floor frame, 28a…upper surface, 28b…outer surface, 28c…mounting seat, 29…cab, 30…engine housing, 30a…outer surface, 30b…door frame, 31…reducing agent tank, 31a…tank body, 31b…liquid supply port, 32…cap, 33…door, 34…opening, 35…supply tank, 35a…nozzle, 36…supply tank mounting base, 37…mounting plate, 37a…notch, 38…arm, 38a…first arm portion, 38b…second arm portion, 38c…intermediate portion, 38d…support portion, 38e…attachment portion, 39…base, 39a…fixed portion, 39b…upright plate portion, 39c…bolt hole, 40…connecting pin, 41…bolt, 42…storage stopper, 43…deployment stopper

Claims

1. An upper slewing body is rotatably provided on the upper part of a lower traveling body. On a floor frame framed on one side of the upper slewing body, a reducing agent tank for storing a liquid reducing agent for treating exhaust gas of an engine and a house for concealing the reducing agent tank from the outside are respectively installed. In a construction machine, the house includes an opening facing the outside the liquid supply port of the reducing agent tank and a door capable of opening and closing the opening, the floor frame is provided with a replenishment tank mounting base for placing a replenishment tank used when replenishing the liquid reducing agent near the liquid supply port of the reducing agent tank, the replenishment tank mounting base has a mounting plate for mounting the replenishment tank, an arm on which the mounting plate is provided, and a base for rotatably supporting the arm about a rotation axis extending in the longitudinal direction of the upper slewing body. By rotating the arm with respect to the base fixed to the floor frame, it is configured to be able to change its posture between a stored state stored inside the opening and a deployed state in which the mounting plate is horizontal and deployed outside the opening. The construction machine is characterized by this.

2. A deployment stopper for holding the replenishment tank mounting base in the deployed state is provided between the floor frame and the arm, the arm has a first arm portion provided with the rotation axis and a second arm portion perpendicular to the first arm portion, the construction machine according to claim 1, wherein the deployment stopper is an elastic body pressed between the floor frame and the second arm portion.

3. The construction machine according to claim 1 or 2, wherein the base is provided with a storage stopper for holding the replenishment tank mounting base in the stored state when the arm abuts.

4. the mounting plate is provided with a notch formed by cutting a part of the material, the construction machine according to claim 1 or 2, wherein the notch includes, in the stored state of the replenishment tank mounting base, a portion of the material that projects in the attachment / detachment direction of the cap of the liquid supply port and overlaps the material as a target for cutting.

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