CN106351279B

CN106351279B - Excavator

Info

Publication number: CN106351279B
Application number: CN201610554487.7A
Authority: CN
Inventors: 花池宏文; 伊藤洋平
Original assignee: Sumitomo SHI Construction Machinery Co Ltd
Current assignee: Sumitomo SHI Construction Machinery Co Ltd
Priority date: 2015-07-15
Filing date: 2016-07-14
Publication date: 2020-08-04
Anticipated expiration: 2036-07-14
Also published as: CN106351279A; JP2017020317A; JP6529845B2

Abstract

The invention provides a shovel capable of more effectively transferring heat to urea water in a urea water hose (69). An excavator according to an embodiment of the present invention includes: an upper slewing body (2); an engine (8) mounted on the upper slewing body (2); an exhaust gas treatment device (10) that purifies exhaust gas from the engine (8); a urea water hose (69) through which urea water used in the exhaust gas treatment device (10) passes; a cooling water hose (80) that extends along the urea water hose (69) and through which engine cooling water having a higher temperature than the urea water flows; a 1 st connector part (C1) for connecting and disconnecting the urea water hose (69); and a 2 nd connector part (C2) for connecting and disconnecting the cooling water hose (80). The 1 st connector part (C1) and the 2 nd connector part (C2) are arranged to be shifted from each other in the longitudinal direction of the hose.

Description

Excavator

Technical Field

The present application claims priority based on japanese patent application No. 2015-141278, filed on 7/15/2015. The entire contents of this Japanese application are incorporated by reference into this specification.

The present invention relates to an excavator carrying a selective catalytic reduction system.

Background

A shovel that mounts an exhaust gas treatment device of a urea selective reduction type using urea water as a reducing agent is known (see patent document 1).

The shovel is provided with a freezing prevention mechanism for preventing freezing of urea water in the urea water pipeline. The urea water pipe is a reducing agent supply hose connecting the urea water tank and the urea water injection device. In the freeze prevention mechanism, the engine cooling water, which is maintained at a high temperature immediately after the diesel engine is cooled, flows through the cooling water pipe of the hose provided in parallel with the urea water pipe, and the urea water pipe is heated to prevent the urea water in the urea water pipe from freezing.

Patent document 1: international publication No. 2015/053273

However, patent document 1 does not mention connection and separation of the urea water line and the respective cooling water lines extending along the urea water line. Therefore, the freezing prevention mechanism may not be able to efficiently dissolve the frozen urea water in the urea water pipeline. This is because, for example, in the case where a connector is used to connect and separate the urea water line and the cooling water line extending in close contact with each other, the urea water line and the cooling water line are separated at the connector.

Disclosure of Invention

Accordingly, it is desirable to provide a shovel capable of more efficiently transferring heat to the reducing agent in the reducing agent supply hose.

An excavator according to an embodiment of the present invention includes: an upper slewing body; an engine mounted on the upper slewing body; a selective catalytic reduction system purifying an exhaust gas of the engine; 1 st hose for passage of a reductant used in the selective catalytic reduction system; a 2 nd hose extending along the 1 st hose and through which a liquid having a higher temperature than the reducing agent flows; a 1 st connector part for connecting and disconnecting the 1 st hose; and a 2 nd connector part corresponding to the 1 st connector part for connecting and separating the 2 nd hose, wherein the 1 st connector part and the 2 nd connector part are arranged in a staggered manner in the longitudinal direction of the hose.

Effects of the invention

With the above configuration, it is possible to provide a shovel capable of more effectively transferring heat to the reducing agent in the reducing agent supply hose.

Drawings

Fig. 1 is a side view of an excavator.

Fig. 2 is a plan view schematically showing an upper revolving body of the excavator in fig. 1.

Fig. 3 is a diagram showing a configuration example of an exhaust gas treatment device mounted on the shovel of fig. 1.

Fig. 4 is a diagram showing a configuration example of the joint portion.

Fig. 5 is a diagram showing a comparative example of the joint portion.

Fig. 6 is a view showing another configuration example of the joint portion.

In the figure, 1-lower traveling body, 2-upper revolving body, 3-control room, 4-boom, 5-arm, 6-bucket, 7-engine room, 8-diesel engine, 9 a-air filter, 9 b-intake pipe, 9C-exhaust pipe, 10-exhaust gas treatment device, 18-hydraulic oil tank, 19-fuel tank, 20-urea water tank, 60-engine control module, 61-turbocharger, 65-intercooler, 66-diesel particulate filter, 67-selective reduction catalyst, 68-urea water injection device, 69-urea water hose, 70-urea water supply pump, 71-filter, 72, 73-NOx sensor, 74-urea water residual quantity sensor, 75-exhaust gas controller, 76-excavator controller, 77-monitor, 80-cooling water hose, 81-SD-1 st part, 82-2 nd part, 83-3 rd part, 84-4 th part, 85-5 th part, C1-1 st part, C2-2 nd part, connector part, C1-F-2 nd connector part, JT 2-461-st part, JT 2-JT connector part, JT 2-L, JT-J0-T2-J-JT connector, and male connector parts 0, and 685 connector parts of male connector sections, 367-female type male connector sections, 369-female type connector sections.

Detailed Description

Next, non-limiting embodiments of the present invention will be described with reference to the drawings. In addition, in the drawings, the same or corresponding reference numerals are given to the same or corresponding parts or components. In addition, a repetitive description of the same or corresponding parts or components will be omitted below. In addition, the relative ratio between the components or assemblies is not intended to be shown unless otherwise specified in the drawings. Therefore, the specific dimensions can be arbitrarily determined by those skilled in the art with reference to the following non-limiting examples. The following examples are merely illustrative and do not limit the invention, and all the features and combinations thereof described in the examples are not necessarily essential features or combinations thereof of the invention.

Fig. 1 is a side view of a shovel (excavator) as an example of a construction machine according to an embodiment of the present invention. In the excavator, an upper revolving structure 2 is rotatably mounted on a lower traveling structure 1, and a cab 3 is provided in a front left portion of the upper revolving structure 2. The boom 4 is rotatably coupled to a front center portion of the upper revolving structure 2, and the arm 5 is rotatably coupled to a front end portion of the boom 4. Further, bucket 6 is rotatably coupled to a distal end portion of arm 5.

Fig. 2 is a plan view schematically showing the upper slewing body 2. As shown in fig. 2, an engine chamber 7 is formed in the upper slewing body 2, and a diesel engine 8 is provided in the engine chamber 7. Further, a cooling fan 12 is provided on the Y1 side of the diesel engine 8, and a heat exchanger unit 13 including a radiator and the like is provided on the Y1 side of the cooling fan 12.

The diesel engine 8 sucks in outside air through an air filter 9a and an intake pipe 9b provided outside the engine room 7. An exhaust pipe 9c is connected to the diesel engine 8, and an exhaust gas treatment device 10 that purifies nitrogen oxides (hereinafter, referred to as NOx) in engine exhaust gas is provided downstream of the exhaust pipe 9 c.

In the present embodiment, the exhaust gas treatment device 10 is a NOx treatment device of urea selective reduction type using urea water as a reducing agent. The exhaust gas treatment device 10 injects urea water to the upstream side of a reduction catalyst (not shown) provided in the exhaust pipe 9c to reduce NOx in the exhaust gas, and the reduction reaction is promoted by the reduction catalyst to make NOx harmless.

The urea water tank 20 is a tank for storing urea water, and is disposed on the opposite side (Y2 side) of the cab 3 with the boom 4 of the upper slewing body 2 interposed therebetween. The fuel tank 19 is disposed behind the urea water tank 20 (on the X2 side), and the hydraulic oil tank 18 is disposed behind the fuel tank 19 (on the X2 side). The hydraulic oil tank 18, the fuel tank 19, and the urea water tank 20 are provided outside the engine room 7. The urea water tank 20 is connected to the exhaust gas treatment device 10 via a urea water hose 69 and a urea water supply pump 70. The urea water hose 69 is configured to be connectable to and separable from each other by one or more joint portions JT.

Fig. 3 is a schematic diagram showing a configuration example of the exhaust gas treatment device 10. In the present embodiment, the exhaust gas treatment device 10 purifies exhaust gas discharged from the diesel engine 8. The diesel engine 8 is controlled by an engine control module (hereinafter, referred to as "ECM") 60.

The air introduced into the intake pipe 9b through the air filter 9a is supplied to the diesel engine 8 through the turbocharger 61, the intercooler 65, and the like. The exhaust gas from the diesel engine 8 passes through the turbocharger 61, reaches the exhaust pipe 9c downstream thereof, is purified by the exhaust gas treatment device 10, and is then discharged into the atmosphere.

A diesel particulate filter 66 that traps particulate matter in the exhaust gas and a selective reduction catalyst 67 that reduces and removes NOx in the exhaust gas are provided in series in the exhaust pipe 9 c.

The selective reduction catalyst 67 receives supply of the reducing agent and continuously reduces and removes NOx in the exhaust gas. In the present embodiment, an aqueous urea solution (urea aqueous solution) is used as the reducing agent in view of ease of operation.

A urea solution injector 68 for supplying urea solution to the selective reduction catalyst 67 is provided in the exhaust pipe 9c on the upstream side of the selective reduction catalyst 67. The urea solution injector 68 is connected to the urea solution tank 20 via a urea solution hose 69.

A supply module SM is provided in the middle of the urea water hose 69. The supply module SM includes a urea water supply pump 70 and a filter 71. In the present embodiment, the supply module SM is configured such that the filter 71 is disposed between the urea water tank 20 and the urea water supply pump 70.

The urea aqueous solution accumulated in the urea aqueous solution tank 20 is supplied to the urea aqueous solution injector 68 by the urea aqueous solution supply pump 70, and is injected from the urea aqueous solution injector 68 to a position upstream of the selective reduction catalyst 67 in the exhaust pipe 9 c.

The urea aqueous solution injected from the urea aqueous solution injection device 68 is supplied to the selective reduction catalyst 67. The supplied urea water is hydrolyzed in the selective reduction catalyst 67 to generate ammonia. This ammonia reduces NOx contained in the exhaust gas in the selective reduction catalyst 67. Thus, the exhaust gas is purified.

The 1 st NOx sensor 72 and the 2 nd NOx sensor 73 are sensors that detect the NOx concentration in the exhaust gas. In the present embodiment, the 1 st NOx sensor 72 is disposed on the upstream side of the urea solution injection device 68, and the 2 nd NOx sensor 73 is disposed on the downstream side of the selective reduction catalyst 67.

The remaining urea solution amount sensor 74 is a sensor for detecting the remaining urea solution amount in the urea solution tank 20. In the present embodiment, the remaining amount of urea solution sensor 74 is disposed above the urea solution tank 20.

The 1 st NOx sensor 72, the 2 nd NOx sensor 73, the remaining amount of urea aqueous solution sensor 74, the urea aqueous solution injector 68, and the urea aqueous solution supply pump 70 are connected to an exhaust gas controller 75. The exhaust gas controller 75 controls the urea solution injection device 68 and the urea solution supply pump 70 so as to inject an appropriate amount of urea solution based on the NOx concentrations detected by the 1 st NOx sensor 72 and the 2 nd NOx sensor 73, respectively.

The exhaust gas controller 75 calculates a ratio of the remaining amount of urea aqueous solution to the entire volume of the urea aqueous solution tank 20 based on the remaining amount of urea aqueous solution output from the remaining amount of urea aqueous solution sensor 74. In the present embodiment, the ratio of the remaining amount of urea solution to the entire volume of the urea solution tank 20 is defined as the remaining amount of urea solution ratio. For example, the remaining urea water ratio of 50% represents a phenomenon in which half of the capacity of the urea water tank 20 remains in the urea water tank 20.

The exhaust controller 75 is connected to the ECM60 via a communication mechanism. The ECM60 is connected to the shovel controller 76 via a communication means, and the shovel controller 76 is connected to the monitor 77 (display device) via a communication means. A warning, an operation state, and the like are displayed on the monitor 77.

Various information on the exhaust gas treatment device 10 included in the exhaust gas controller 75 is shared by the shovel controller 76. The ECM60, the exhaust gas controller 75, and the shovel controller 76 each include a CPU, a RAM, a ROM, an input/output port, a storage device, and other computing devices.

The exhaust gas treatment device 10 has a heat supply function of supplying heat to the urea water tank 20 and the urea water hose 69. For example, the heat supply function is performed to prevent freezing of the urea water in cold regions or to dissolve the frozen urea water. In the present embodiment, engine cooling water (e.g., long-life coolant) of the diesel engine 8 is used through the cooling water hose 80.

Specifically, the engine coolant immediately after cooling the diesel engine 8 passes through the 1 st portion 81 of the coolant hose 80 and reaches the 2 nd portion 82 while maintaining a high temperature. The 2 nd section 82 is a portion of the cooling water hose 80 that is connected to the outside of the urea water tank 20. When the engine cooling water having a higher temperature than the urea water flows through the 2 nd section 82, heat is supplied to the urea water tank 20 and the urea water located therein.

After that, the engine cooling water reaches the 3 rd part 83 and the supply module SM. The 3 rd section 83 is a part of the cooling water hose 80 that is in close contact with the urea water hose 69. When the engine coolant having a higher temperature than the urea water flows through the 3 rd portion 83 of the coolant hose 80 parallel to the urea water hose 69, heat is supplied to the urea water hose 69 and the urea water located therein. When the engine cooling water having a higher temperature than the urea solution flows through the flow path formed in the supply module SM, heat is supplied to the supply module SM (including the urea solution supply pump 70 and the filter 71) and the urea solution located therein.

After that, the engine cooling water, which has finished supplying heat to the 2 nd and 3

rd portions

82 and 83 and has a lower temperature, reaches the heat exchanger unit 13 through the 4 th portion 84 of the cooling water hose 80 (see fig. 2). The 4 th portion 84 is a portion of the cooling water hose 80 arranged between the 3 rd and 5

th portions

83 and 85 and the heat exchanger unit 13, and is not in close contact with the urea water hose 69.

In addition, the 5 th part 85 is a part of the cooling water hose 80 used for cooling the urea solution injection device 68. When the engine cooling water having a temperature lower than that of the urea solution injection device 68 in the high temperature state flows through the 5 th section 85, the heat is taken away from the urea solution injection device 68 in the high temperature state, and the urea solution injection device 68 is cooled to prevent overheating. Then, when the engine coolant having a high temperature (higher than the temperature of the urea aqueous solution) by receiving the supply of heat flows through the portion 85a parallel to the urea aqueous solution hose 69, heat is supplied to the urea aqueous solution hose 69 and the urea aqueous solution located therein. When the urea solution injection device 68 is in the low temperature state, heat is supplied to the urea solution injection device 68 and the urea solution located therein when the engine cooling water having a temperature higher than that of the urea solution injection device 68 in the low temperature state flows through the 5 th section 85. After that, the engine cooling water that has finished the supply of heat in the portion 85a and has reached a lower temperature joins the engine cooling water flowing through the 3 rd portion 83, and then reaches the heat exchanger unit 13 through the 4 th portion 84.

In this way, the heat supply function supplies heat to the urea water tank 20, the urea water hose 69, the supply module SM, and the urea water injection device 68 by the engine cooling water, and prevents freezing of the urea water located inside them or dissolves the frozen urea water.

The urea water hose 69 and the coolant water hose 80 can be connected to and separated from each other by joint portions JT1 to JT 6.

Fig. 4 is a diagram showing a configuration example of the joint portion JT 1. Specifically, fig. 4(a) shows a state where the urea water hose 69 and the cooling water hose 80 are connected to each other by a joint JT1, and fig. 4(B) shows a state where the urea water hose 69 and the cooling water hose 80 are separated from each other by a joint JT 1. The urea water hose 69 and the coolant water hose 80 are covered and closely attached to each other by an exterior material EC such as a bellows outside the periphery of the joint JT 1. This is to promote the transfer of heat from the engine cooling water to the urea water. The joint sections JT2 to JT6 have the same structure as the joint section JT1, and therefore, their illustration and description are omitted.

The joint JT1 includes a 1 st connector portion C1 for connecting and disconnecting the urea water hose 69 and a 2 nd connector portion C2. for connecting and disconnecting the cooling water hose 80, and the joint JT1 may be L-shaped, T-shaped, Y-shaped, or the like.

The 1 st connector portion C1 is constituted by a combination of a female connector C1F and a male connector C1M, for example. Similarly, the 2 nd connector portion C2 is also constituted by a combination of a female connector C2F and a male connector C2M.

The female connectors C1F and C2F are, for example, connectors provided with an unlocking button (a thumb latch) that can be pressed by a thumb, and the hose is separated in a state where the thumb latch is pressed, in the present embodiment, the female connector C1F is formed of resin and has a large diameter portion L D1 and a small diameter portion sd1, similarly, the female connector C2F is formed of resin and has a large diameter portion L D2 and a small diameter portion sd2, the finger latch is disposed at the large diameter portion L D1 and the large diameter portion L D2, and the female connectors C1F and C2F may be made of metal.

The male connectors C1M and C2M are, for example, non-flexible resin coupling sleeves corresponding to the connectors, and are inserted into flexible hoses to be fixed. The male connectors C1M and C2M may be metal coupling sleeves.

In the state of fig. 4(a), the operator can simultaneously separate the urea water hose 69 and the cooling water hose 80 by pulling out the female connector C1F from the male connector C1M and pulling out the female connector C2F from the male connector C2M, respectively, at the joint JT 1. Specifically, the operator pulls female connector C1F to the left while pressing the thumb of female connector C1F to press the thumb latch, and pulls female connector C2F to the right while pressing the thumb latch of female connector C2F to press the thumb latch of the right hand. By this operation, the urea water hose 69 and the cooling water hose 80 can be separated at the same time by the joint JT 1.

In the state of fig. 4(B), the operator inserts the female connector C1F into the male connector C1M and inserts the female connector C2F into the male connector C2M, whereby the urea water hose 69 and the cooling water hose 80 can be connected at the same time by the joint JT 1. Specifically, the operator inserts the female connector C1F along the male connector C1M to the right with the left hand, and inserts the female connector C2F along the male connector C2M to the left with the right hand. By this operation, the urea water hose 69 and the cooling water hose 80 can be connected at the same time by the joint JT 1.

In addition, the joint JT1 in fig. 4 has an effect of easily transferring heat from the engine coolant to the urea water by relatively reducing the gap D1 between the hoses when connected.

Here, the effect of the structure of the joint portion JT1 in fig. 4 will be described with reference to a comparative example in fig. 5. Fig. 5 is a diagram showing a joint JT0 as a comparative example, in which fig. 5(a) shows a state in which the urea water hose 69 and the cooling water hose 80 are connected to each other by a joint JT0, and fig. 5(B) shows a state in which the urea water hose 69 and the cooling water hose 80 are separated from each other by a joint JT 0.

The joint JT0 of fig. 5 differs from the joint JT1 of fig. 4 in that the 1 st connector part C1 and the 2 nd connector part C2 are arranged in the same direction in the longitudinal direction of the hose. That is, in the joint JT1 at the time of connection in fig. 4(a), a gap G1 is formed between the 1 st connector part C1 and the 2 nd connector part C2 in the longitudinal direction of the hose, and the joint JT0 at the time of connection in fig. 5(a) differs at a point where such a gap is not formed. The gap G1 is a width within a range (for example, 2 meters) in which the operator can operate the female connector C1F with one hand (left hand) and the female connector C2F with the other hand (right hand), and the width within the shoulder width of the operator is, for example, 20cm to 40 cm.

Therefore, in joint JT0 at the time of connection in fig. 5(a), large diameter portion L D1 of female connector C1F and large diameter portion L D2 of female connector C2F are located at the same position in the hose longitudinal direction and are adjacent to each other in the hose radial direction, while in joint JT1 at the time of connection in fig. 4(a), large diameter portion L D1 of female connector C1F and large diameter portion L D2 of female connector C2F are located at different positions in the hose longitudinal direction and are not adjacent to each other in the hose radial direction, and as a result, gap D1 between the hoses in joint JT1 at the time of connection in fig. 4(a) becomes smaller than gap D0. between the hoses in joint JT0 at the time of connection in fig. 5(a), and therefore, the urea cooling rate from joint JT L D1 and large diameter portion D8269556 in the hose radial direction is not adjacent to joint JT 0.

The joint JT0 in fig. 5 is disposed in the 1 st connector part C1 and the 2 nd connector part C2 in the same direction in the longitudinal direction of the hose. Therefore, the operator cannot separate the urea water hose 69 and the cooling water hose 80 at the same time by the joint JT 0. This is because the respective finger latches of the 1 st connector part C1 and the 2 nd connector part C2 cannot be pressed simultaneously. In this regard, joint section JT1 capable of simultaneous separation can achieve higher operability than joint section JT 0.

Next, another configuration example of the joint portion JT1 will be described with reference to fig. 6. Fig. 6 is a diagram showing another configuration example of the joint portion JT 1. Fig. 6(a) shows a state where the urea water hose 69 and the cooling water hose 80 are connected to each other by a joint JT1, and fig. 6(B) shows a state where the urea water hose 69 and the cooling water hose 80 are separated from each other by a joint JT 1.

The joint JT1 of fig. 6 differs from the joint JT0 of fig. 5 in that the 1 st connector part C1 and the 2 nd connector part C2 are arranged at different positions in the longitudinal direction of the hose in the same direction. That is, in the joint JT1 at the time of connection in fig. 6(a), a distance G2 longer than the length of the female connector C1F is formed between the 1 st connector portion C1 and the 2 nd connector portion C2 in the hose longitudinal direction, whereas in the joint JT0 at the time of connection in fig. 5(a), the distance is different at a point where such a distance is not formed.

Therefore, in joint JT1 at the time of connection in fig. 6(a), large diameter portion L D1 of female connector C1F and large diameter portion L D2 of female connector C2F are different in position in the hose longitudinal direction and are not adjacent to each other in the hose radial direction, specifically, large diameter portion L D1 is adjacent to cooling water hose 80 in the hose radial direction, and large diameter portion L D2 is adjacent to urea water hose 69 in the hose radial direction, and as a result, inter-hose gap D2 in joint JT1 at the time of connection in fig. 6(a) is smaller than inter-hose gap D0. in joint JT0 at the time of connection in fig. 5(a), and therefore, joint JT1 can improve the heat transfer rate from the engine cooling water to the urea water as compared with joint JT 0.

In this way, the joint JT1 is configured such that the 1 st connector part C1 and the 2 nd connector part C2 are displaced from each other in the longitudinal direction of the hose at the time of connection, and therefore, in the joint JT1 at the time of connection, the large diameter part L D1 of the female connector C1F and the large diameter part L D2 of the female connector C2F are not adjacent to each other in the radial direction of the hose, and as a result, the joint JT1 can reduce the clearance between the hoses at the time of connection and can improve the heat transfer rate from the engine coolant to the urea water, as compared with the joint JT0 at the time of connection in fig. 5 (a).

Further, the arrangement of the female connector C1F and the male connector C1M in the 1 st connector portion C1 may be configured to be opposite to the arrangement of the female connector C2F and the male connector C2M in the 2 nd connector portion C2. Specifically, as shown in fig. 4, the female connector C1F may be on the left side, the male connector C1M on the right side, the female connector C2F on the right side, and the male connector C2M on the left side. With this configuration, the operator can simultaneously press the thumb of the left hand and the thumb of the right hand against the thumb latch of the female connector C1F and the thumb latch of the female connector C2F to separate the urea water hose 69 and the cooling water hose 80. Therefore, the joint portion JT1 can improve the operability when the hose is detached.

The joint JT1 may be disposed such that the 1 st connector part C1 and the 2 nd connector part C2 are the same in the longitudinal direction of the hose, but are different in position, and in this case, the large diameter part L D2 of the female connector C2F may be disposed adjacent to the small diameter part SD1 of the female connector C1F in the radial direction of the hose, or the large diameter part L D1 of the female connector C1F may be disposed adjacent to the small diameter part SD2 of the female connector C2F in the radial direction of the hose.

The joint JT1 may be arranged such that the 1 st connector part C1 and the 2 nd connector part C2 are located at the same position in the longitudinal direction of the hose, but are oriented in different directions, in this case, the large diameter part L D1 of the female connector C1F may be adjacent to the small diameter part SD2 of the female connector C2F in the radial direction of the hose, and the large diameter part L D2 of the female connector C2F may be adjacent to the small diameter part SD1 of the female connector C1F in the radial direction of the hose.

While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the specific embodiments, and various modifications and improvements can be made within the spirit of the present invention described in the claims.

For example, although the above-described embodiment employs a connector provided with a finger latch, a screw lock type connector, a latch lock type connector, a slider lock type connector, a push-pull type connector, or the like may be employed. This is because the present invention is effective in a structure employing a connector portion having an outer dimension larger than the diameter of the hose and a locking mechanism operable with one hand by the operator.

In the configuration example of fig. 3, the urea water hose 69 and the cooling water hose 80 can be connected to and disconnected from each other at 6 positions JT1 to JT 6. However, the present invention is not limited to this structure. For example, the urea water hose 69 and the cooling water hose 80 may be connectable and disconnectable at less than 6 or 7 or more positions. As shown in fig. 2, the urea water hose 69 and the cooling water hose 80 may be configured to be connectable to and disconnectable from each other downstream of the urea water supply pump 70 located inside the engine room 7, or may be configured to be connectable to and disconnectable from each other outside the engine room 7. In this way, the number and arrangement of the joint portions JT can be determined appropriately according to the wiring paths of the urea water hose 69 and the cooling water hose 80, maintenance performance, and the like.

Claims

1. A shovel is provided with:

an upper slewing body;

an engine mounted on the upper slewing body;

a selective catalytic reduction system purifying an exhaust gas of the engine;

1 st hose for passage of a reductant used in the selective catalytic reduction system;

a 2 nd hose extending along the 1 st hose and through which a liquid having a higher temperature than the reducing agent flows;

a 1 st connector part for connecting and disconnecting the 1 st hose; and

a 2 nd connector part corresponding to the 1 st connector part for connecting and disconnecting the 2 nd hose,

the 1 st connector part and the 2 nd connector part are arranged to be shifted from each other in the longitudinal direction of the hose.

2. The shovel of claim 1,

the 1 st connector part and the 2 nd connector part are each constituted by a combination of a female connector and a male connector,

the arrangement of the female and male connectors in the 1 st connector portion is opposite to the arrangement of the female and male connectors in the 2 nd connector portion.

3. The shovel of claim 1 or 2, wherein,

the 1 st hose and the 2 nd hose are bundled together.

4. The shovel of claim 1 or 2, wherein,

the 1 st hose and the 2 nd hose are formed of a flexible material, and,

the 1 st connector portion and the 2 nd connector portion are formed of a non-flexible material.

5. The shovel of claim 1 or 2, wherein,

the 1 st connector part is arranged at a position within 2 meters from the 2 nd connector part.

6. The shovel of claim 1 or 2, wherein,

the fluid passing through the 2 nd hose is cooling water of the engine.