JP2013028987A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machine in which an operation environment of an operator can be maintained in a comfortable state by suppressing temperature elevation in a cab caused by direct sunlight.SOLUTION: At a lower side of a ceiling board 16 forming a cab 13, a ceiling circulation path 30 is provided so as to overlay the head of an operator. Inside a left side board 17C forming the cab 13, a first side board circulation path 32 is provided which is connected to a downstream side of the ceiling circulation path 30. Between a downstream side of the first side board circulation path 32 and an air conditioning device 22, a return circulation path 35 is provided which connects the first side board circulation path 32 and the air conditioning device 22. Conditioning air blown out of outlets 26, 27, 28 in the cab 13 passes through the ceiling circulation path 30, the first side board circulation path 32, the return circulation path 35 and the like and returns to the air conditioning device 22 as inner air. At this time, the ceiling board 16, the left side board 17C and the like can be cooled by the inner air.

Description

  The present invention relates to a construction machine such as a hydraulic excavator or a hydraulic crane, and more particularly to a construction machine provided with a cab on which an operator rides.

  Generally, a hydraulic excavator, which is a representative example of a construction machine, includes a lower traveling body that can be self-propelled and an upper revolving body that is turnably mounted on the lower traveling body, and a front portion of the upper revolving body. A working device is provided on the side so as to be able to move up and down. The excavator performs excavation work and the like of the earth and sand by moving the working device up and down while turning the upper turning body.

  Here, the upper revolving structure of the hydraulic excavator normally surrounds a revolving frame in which a working structure is provided and a working device is provided on the front side, and a floor plate and a ceiling plate are mounted on the revolving frame. A cab that defines a driver's cab, a driver's seat provided in the cab and seated by an operator, an air conditioner that generates conditioned air that is comfortable for the operator, and a space between the air conditioner and the cab's cab A supply path for supplying conditioned air generated by an air conditioner to the operator's cab and an air outlet provided on the downstream side of the supply path for blowing the conditioned air into the cab (for example, patent document) 1).

  Here, the hydraulic excavator according to Patent Document 1 is provided with a duct (suction duct) for returning air in the cab (operator's cab) to the air conditioner, and configured to circulate air between the cab and the air conditioner through the duct. doing.

  On the other hand, a configuration is known in which a duct is provided directly below the ceiling plate of the cab, and the air in the cab is discharged to the outside air through the duct (see, for example, Patent Document 2).

JP 2006-28754 A Japanese Utility Model Publication No. 5-49855

  According to the prior art disclosed in Patent Document 2, the air flowing in a duct provided directly below the ceiling board absorbs the heat of the ceiling board heated by direct sunlight (cools the ceiling board). Thereby, it is thought that the temperature rise in the cab (operator's cab) due to direct sunlight can be suppressed. However, in the cab, not only the ceiling plate but also the side plate surrounding the driver's seat is heated by direct sunlight. For this reason, in the prior art by patent document 2, there exists a possibility that the temperature rise in the cab by direct sunlight cannot fully be suppressed.

  In addition, in the prior art disclosed in Patent Document 2, since the duct provided directly below the ceiling plate is configured to communicate with the outside air, there is a possibility that dust such as sand and dust cannot be sufficiently prevented from entering the cab. That is, in order to prevent dust from entering the cab, even if the pressure in the cab is set higher than the outside air (pressurization), the pressure escapes through the duct provided directly under the ceiling plate, and the pressure in the cab May not be high. As a result, there is a problem that dust easily enters the cab.

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a construction machine that can suppress a temperature increase in the cab due to direct sunlight and can keep an operator's operating environment in a comfortable state. .

  A construction machine according to the present invention includes a vehicle body provided with a working device, a cab that constitutes a part of the vehicle body and that surrounds a floor plate and a ceiling plate with a side plate, and defines a cab. A driver's seat provided by the operator, an air conditioner that generates conditioned air that is comfortable for the operator, and a connection between the air conditioner and the cab's cab, and the conditioned air generated by the air conditioner being generated in the cab And a blowout port that is provided on the downstream side of the supply passage and blows the conditioned air into the cab.

  In order to solve the above-mentioned problem, the feature of the configuration adopted by the invention of claim 1 is that the air outlet is provided on the lower side of the ceiling plate that forms the cab and covers the overhead of the operator. The conditioned air blown out from the ceiling circulates along the ceiling plate as inside air, and is located on the inner side of the side plate forming the cab and is connected to the downstream side of the ceiling circulation passage and passes through the ceiling circulation passage Returning the inside air that has passed through the side plate circulation path to the air conditioner that is provided by connecting the side plate circulation path through which the inside air circulates along the side plate, the downstream side of the side plate circulation path, and the air conditioner The configuration includes a circulation path.

  According to a second aspect of the present invention, the conditioned air blown from the air outlet located inside the left side plate and / or the right side plate among the side plates forming the cab circulates along the side plate as inside air. A circulation path is provided, and the other side plate circulation path is configured to connect the downstream side thereof to the upstream side of the return circulation path.

  The invention of claim 3 is that the side plate circulation path is provided in a portion of the side plate on the rear side of the driver seat.

  According to a fourth aspect of the present invention, the vehicle body includes a self-propelled lower traveling body and an upper revolving body that is rotatably mounted on the lower traveling body, and the upper revolving body includes a support structure. The return circulation path comprises: a turning frame formed; a cab bed provided on the turning frame; the cab provided on the cab bed; and the air conditioner provided in the cab bed. Is that the cab bed is arranged in the cab bed via the floor plate of the cab.

  According to the first aspect of the present invention, it is possible to suppress an increase in the temperature in the cab (operating room) due to direct sunlight and to keep the operator's operating environment in a comfortable state. Furthermore, the infiltration of dust into the cab can be suppressed.

  That is, when the inside air passes through a ceiling circulation path provided over the head of the operator and a side plate circulation path connected to the downstream side of the ceiling circulation path, the ceiling air is heated by direct sunlight, Both the side plates can be cooled. Thereby, compared with a prior art, the temperature rise in a cab by direct sunlight can fully be suppressed, and an operator's driving environment can be maintained in a comfortable state.

  Moreover, since the inside air that has passed through the ceiling circulation path and the side plate circulation path is returned to the air conditioner through the return circulation path, it is possible to suppress the pressure in the cab from escaping to the outside air. Thereby, the pressure in the cab can be stably increased (pressurized) from the outside air, and the entry of dust such as sand and dust into the cab can be sufficiently suppressed.

  According to invention of Claim 2, since it is set as the structure which provides another side-plate circulation path in addition to a ceiling circulation path and a side-plate circulation path, the inside air which passes a side-plate circulation path, and the inside air which passes another side-plate circulation path The side plate can be cooled by two internal airs. Thereby, the temperature rise in the cab due to direct sunlight can be further suppressed.

  According to invention of Claim 3, since it is set as the structure which provides a side plate circulation path in the site | part behind a driver's seat among side plates, the back side of the operator seated in a driver's seat by the inside air which passes through this side plate circulation path Can be stably held at a comfortable temperature state.

  According to the invention of claim 4, even if the cab supported at a high position via the cab bed is heated by direct sunlight, the ceiling plate and the side plate are stabilized by the internal air passing through the ceiling circulation path and the side plate circulation path. And can be cooled. As a result, even in a high cab type construction machine that easily receives direct sunlight and tends to increase the temperature in the cab, the inside of the cab is brought to a comfortable temperature state by the inside air passing through the ceiling circulation path and the side plate circulation path. It can be held stably.

It is a front view which shows the large sized hydraulic excavator by embodiment of this invention. It is a longitudinal cross-sectional view which shows a cab, a cab bed, an air conditioner, etc. It is the cross-sectional view which expanded the cab etc. from the arrow III-III direction in FIG. It is a disassembled perspective view of the cab shown in a state where the ceiling plate, the left and right side plates, the front plate, the ceiling circulation path and the like are separated. It is an expansion perspective view of the (V) part in Drawing 4 showing the inside of a cab. It is an expansion perspective view of the same position as Drawing 5 shown in the state where the ceiling inner cover was attached. It is a block diagram which shows an air conditioner, a supply path, a ceiling circulation path, a side circulation path, a return circulation path, etc. It is an expansion perspective view similar to FIG. 5 which shows the inside of the cab by the modification of this invention.

  Hereinafter, an embodiment of a construction machine according to the present invention will be described in detail with reference to FIGS. 1 to 7 by taking as an example a case where the construction machine is applied to a hydraulic excavator.

  In the figure, reference numeral 1 denotes a hydraulic excavator as a typical example of a construction machine, and the hydraulic excavator 1 of the present embodiment is formed as a large hydraulic excavator having a weight of, for example, about 100 to 800 tons. The hydraulic excavator 1 includes a crawler-type lower traveling body 2 that can be self-propelled and an upper revolving body 3 that is rotatably mounted on the lower traveling body 2. A working device 4 is provided on the front side of the upper swing body 3 constituting the vehicle body so as to be able to move up and down, and the working device 4 performs excavation work such as earth and sand.

  The upper swing body 3 includes a swing frame (swivel body bed) 5 formed as a support structure made of a plurality of steel materials, steel plates, and the like, and a counter attached to the rear end of the swing frame 5. A weight cover 6, a building cover 7 that is disposed on the front side of the counter weight 6 and covers equipment such as an engine (not shown) mounted on the revolving frame 5, and a cab device 11 described later are roughly configured.

  Reference numeral 11 denotes a high cab type cab device mounted on the left side of the front portion of the revolving frame 5. The cab device 11 includes a cab bed 12, a cab 13, a driver's seat 18, an air conditioner 22, and supply paths 23, 24, 25, which will be described later. In addition, a circulation path 29 and the like are provided.

  A cab bed 12 is provided on the revolving frame 5, and the cab bed 12 constitutes a lower side of the cab device 11. The cab bed 12 supports the cab 13 at a high position away from the ground, and maintains the state in which the operator who has boarded the cab 13 can look around from a high position, thereby ensuring the visibility of the operator. .

  Here, the cab bed 12 is formed as a substantially box-shaped (rectangular) hollow structure by, for example, welding a plurality of steel plates. Specifically, the cab bed 12 is erected on the periphery of the bottom plate 12A at a position surrounding the bottom plate 12A and the bottom plate 12A attached to the front left side of the revolving frame 5, and the front and rear portions of the cab bed 12 are provided. The front plate 12B, the rear plate 12C, the left plate 12D, the right plate 12E and the top plate 12F on which a cab 13 described later is mounted are formed.

  In the cab bed 12, a space 12G surrounded by the front plate 12B, the rear plate 12C, the left and right side plates 12D and 12E, and the top plate 12F is defined, and the space 12G (cab bed 12) is defined. Inside) is provided with an air conditioner 22 to be described later.

  Reference numeral 13 denotes a cab provided on the upper side of the cab bed 12 and constituting a part of the upper swing body 3, and the cab 13 defines a cab 13A in which an operator is boarded. Here, the cab 13 is formed as a substantially box-shaped (square shape) hollow structure by welding a plurality of steel plates, for example. Specifically, the cab 13 is formed by surrounding a floor plate 14 and a ceiling plate 16 described later with a side plate 17.

  Reference numeral 14 denotes a floor plate that forms a floor surface portion (floor surface) of the cab 13, and the floor plate 14 is disposed above the top plate 12F of the cab bed 12, and is attached to the top plate 12F via, for example, a vibration-proof mount 15 or the like. It is supported. Accordingly, the cab 13 is configured to be mounted on the cab bed 12 via the vibration-proof mount 15 or the like.

  Here, the floor board 14 is formed in a substantially square shape by a plate material such as a steel plate, and four support pillars 14 </ b> A for supporting a ceiling board 16 to be described later are provided upright at four corners of the floor board 14. . Further, ventilation holes 14B, 14C, 14D, and 14E penetrating upward and downward are provided at four positions on the floor board 14. Specifically, in the front and rear substantially central portion of the left end portion of the floor plate 14, there are a ventilation hole 14 </ b> B through which conditioned air from the air conditioner 22 described later to the inside of the cab 13 (operating room 13 </ b> A) passes, A vent hole 14C through which the inside air returning to the air conditioner 22 passes is provided. In addition, a ventilation hole 14D through which conditioned air from the air conditioner 22 enters the cab 13 passes through the front and rear substantially central portions of the floor 14 and the left and right central portions of the rear end. Each hole 14E is provided.

  Reference numeral 16 denotes a ceiling plate that forms a roof portion (top surface portion) of the cab 13. The ceiling plate 16 is made of a metal plate material such as a steel plate and covers an upper side of a driver seat 18 described later. Here, below the ceiling board 16, the ceiling circulation path 30 mentioned later is provided. Specifically, the roof portion (top surface portion) of the cab 13 is formed as a double structure (double ceiling structure) in which a ceiling plate 16 and a ceiling inner cover 31 described later are provided facing each other in the upward and downward directions. The inside (the gap formed between the ceiling board 16 and the ceiling inner cover 31) is a ceiling circulation path 30 through which the inside air passes.

  Reference numeral 17 denotes a side plate provided so as to surround the floor plate 14 and the ceiling plate 16, and the side plate 17 is disposed on the rear side facing the front plate 17A disposed on the front side and the front plate 17A. A rear plate 17B, a left side plate 17C connecting the front plate 17A and the left end of the rear plate 17B, and a right side plate 17D facing the left side plate 17C and connecting the front plate 17A and the right end of the rear plate 17B. It is comprised by. The front plate 17A, the rear plate 17B, the left plate 17C, and the right plate 17D form the front, rear, left, and right side portions of the cab 13.

  The front plate 17A is provided with a substantially rectangular front window 17E, and an operator seated in a driver's seat 18 described later can see the working device 4 and the like through the front window 17E, and ensures a forward view of the cab 13. It has a configuration. The rear plate 17B is formed in a stepped plate shape that is bent so that the substantially central portion in the left and right directions extends in the front and rear directions, and an operator can connect the cab 13 to the opening 17B1 provided on the right side of the rear plate 17B. A door 17F (see FIG. 3) that is opened and closed to enter / exit the inside (operating room 13A) is attached.

  The left side plate 17C is provided with a front left window 17G and a rear left window 17H, and the left side view of the cab 13 is secured by the left windows 17G and 17H. The right side plate 17D is provided with an upper right window 17J and a lower right window 17K, and the right side field of view of the cab 13 is secured by the right windows 17J and 17K.

  In the cab 13, a driver's seat 18 on which the operator sits on the floor 14, a travel lever / pedal 19 for traveling the lower traveling body 2, an operation lever 20 for operating the work device 4, etc. An auxiliary seat 21 (see FIG. 3) on which an operator other than the operator seated on the driver's seat 18 sits is provided.

  An air conditioner 22 is provided in the space 12G in the cab bed 12, and the air conditioner 22 generates cool air or warm air conditioned air that is comfortable for the operator and supplies the conditioned air into the cab 13. The air conditioning in the cab 13 (operating room 13A) is performed. Here, as shown in FIG. 7, the air conditioner 22 includes, for example, three air conditioning systems individually connected to the air outlets 26, 27, and 28. These air conditioning systems are each constituted by a compressor 22A, a condenser 22B, a receiver tank 22C, an expansion valve 22D, an evaporator 22E, a blower fan 22F, an air conditioning case 22G, a refrigerant pipe 22H, and the like.

  In this case, the compressor 22A is mounted on the bottom plate 12A of the cab bed 12 together with the hydraulic motor 22J (see FIG. 2), and is driven by the hydraulic motor 22J to compress the refrigerant. The condenser 22B liquefies the compressed refrigerant, and the receiver tank 22C accommodates the liquefied refrigerant. The expansion valve 22D lowers the pressure of the refrigerant flowing out from the receiver tank 22C, and the evaporator 22E cools the surrounding air when the refrigerant evaporates. The blower fan 22F is configured to blow the cooled air to the cab 13 side.

  In addition, the air conditioning case 22G of each air conditioning system accommodates devices such as an evaporator 22E and a blower fan 22F, and is arranged in the cab bed 12 so as to overlap in the upward and downward directions. A filter box 22K containing a filter element (not shown), for example, is connected to the suction side of each air conditioning case 22G via a connection duct 22L, and a blower side of each air conditioning case 22G is described later. Supply paths 23, 24, and 25 are connected.

  Next, a supply path for supplying conditioned air generated by the air conditioner 22 into the cab 13 will be described.

  Reference numerals 23, 24, and 25 denote three supply paths that connect between the air conditioner 22 and the cab 13A of the cab 13. Each of the supply paths 23, 24, and 25 cabs conditioned air generated by the air conditioner 22. 13 (operating room 13A). These supply passages 23, 24, and 25 are disposed between the air conditioner 22 and the ventilation holes 14B, 14D, and 14E of the floor plate 14, and the hoses 23A, 24A, and 25A extending in the cab bed 12 upward and downward. And the upstream side is connected to the vent holes 14B, 14D, 14E of the floor plate 14, and the outlets 23B, 24B, 25B are provided on the downstream side with openings 26, 27, 28 to be described later opened. .

  Here, the hoses 23A, 24A, 25A forming the upstream side of the supply paths 23, 24, 25 are made of, for example, a flexible hose, more specifically, rubber, synthetic resin, metal, or the like. A hose, a hose with a part or the whole being bellows-like, etc. can be used. Further, the blow-out boxes 23B, 24B, and 25B that form the downstream sides of the supply paths 23, 24, and 25 and are disposed in the cab 13 are hollow tubular ducts (pipe lines) made of metal, synthetic resin, or the like. A box or the like can be used. Further, the blowing boxes 23B, 24B, and 25B are provided with side plate covers such as linings so as to face the inner side (inner side) of the side plate 17 of the cab 13 with a gap (the side plate 17 has a double structure), and the inside ( It is also possible to use the one formed as a flow path (ventilation path) through which air passes (the gap between the side plate 17 and the side plate cover).

  Here, the blowing box 23B located on the left side of the driver's seat 18 is formed in a substantially inverted U shape as a whole. That is, the blow-out box 23B rises upward from the ventilation hole 14B of the floor plate 14 to the inner side (inner side) of the left side plate 17C of the cab 13 along the left side plate 17C, and below the front left window 17G of the left side plate 17C. This portion extends forward and rearward along the left side plate 17C, and further extends downward along the left side plate 17C from the front end toward the upper surface of the floor plate 14. Then, as indicated by an arrow A in FIG. 5, the conditioned air from the air conditioner 22 circulates in the blowout box 23B along the left side plate 17C, and from the outlet 26 described later around the driver seat 18 in the cab 13. It is blown out toward.

  The reason why the blowout box 23B is formed in a substantially inverted U shape is to avoid a cab mount (not shown) provided at a portion on the left end side of the floor plate 14 and on the front side of the ventilation hole 14B. In this case, the blowing box 23B is configured to cover almost the entire portion of the left side plate 17C except for the cab mount below the front left window 17G, and passes through the portion of the left side plate 17C through the blowing box 23B. It can be cooled or warmed by conditioned air.

  The blowing box 24B located on the right side of the driver's seat 18 is formed in a substantially inverted L shape as a whole. That is, the blowout box 24B rises upward from the ventilation hole 14D of the floor plate 14 to the inside of the right side plate 17D of the cab 13 along the right side plate 17D, and the upper right window 17J and the lower right window 17K of the right side plate 17D. Is formed so as to extend forward and rearward along the right side plate 17D. And as shown by the arrow B in FIG. 5, the conditioned air from the air conditioner 22 circulates in the blowout box 24B along the right side plate 17D, and from the outlet 27 described later around the driver seat 18 in the cab 13 It is blown out toward. In this case, the blowing box 24B is configured to cover substantially the entire portion of the right side plate 17D except for the lower right window 17K below the upper right window 17J, and the portion of the right side plate 17D is covered with the blowing box 24B. It can be cooled or warmed by conditioned air passing through the inside.

  The blowing box 25B located on the rear side of the driver's seat 18 is generally formed in an I shape. That is, the blow-out box 25B rises upward from the ventilation hole 14E of the floor plate 14 to the inside of the rear plate 17B of the cab 13 along the rear plate 17B, and the left and right central portions of the rear plate 17B are arranged at the rear plate. It is formed to extend upward and downward along 17B. Then, as indicated by an arrow C in FIG. 5, the conditioned air from the air conditioner 22 circulates along the rear plate 17B in the blowout box 25B, and from the air outlet 28 described later around the driver seat 18 in the cab 13. It is blown out toward. In this case, the blowing box 25B is configured to cover substantially the entire portion of the rear plate 17B except the door 17F on the right side of the auxiliary seat 21, and the portion of the rear plate 17B passes through the blowing box 25B. It can be cooled or warmed by air.

  Reference numerals 26, 27, and 28 denote outlets provided in the outlet boxes 23B, 24B, and 25B. The outlets 26, 27, and 28 are arranged on the left side, right side, and rear side of the driver's seat 18, respectively. And the blower outlets 26, 27, and 28 blow out the conditioned air generated in the air conditioner 22 to the cab 13A of the cab 13 (around the driver's seat 18).

  Next, the circulation path which returns the conditioned air blown out from the blowout ports 26, 27 and 28 to the air conditioner 22 as inside air will be described.

  Reference numeral 29 denotes a circulation path that returns the conditioned air blown from the outlets 26, 27, and 28 to the air conditioner 22 as inside air. The circulation path 29 is used to circulate air between the air conditioner 22 and the cab 13. The circulation path 29 includes a ceiling circulation path 30, a first side plate circulation path 32, and a second circulation path described later. The side plate circulation path 33, the floor board circulation path 34, and the return circulation path 35 are roughly configured.

  A ceiling circulation path 30 is provided so as to cover the overhead of the operator sitting on the driver's seat 18, and the ceiling circulation path 30 is located below the ceiling plate 16 that forms the cab 13. The ceiling circulation path 30 circulates along the ceiling plate 16 as conditioned air blown out from the air outlets 26, 27, and 28 as inside air.

  For this purpose, a ceiling inner cover 31 such as a lining is provided on the lower side of the ceiling plate 16 so as to face the ceiling plate 16 with a gap in the upward and downward directions. A gap formed between the ceiling plate 16 and the ceiling inner cover 31 is formed as a ceiling circulation path 30 through which the inside air passes.

  Here, the ceiling inner cover 31 is provided in parallel with the ceiling board 16 and has a ceiling panel 31A having substantially the same shape as the ceiling board 16, and is located on the upper surface side of the ceiling panel 31A and disposed on the front side, and is directed to the left and right. A front frame 31B extending to the left, a rear frame 31C arranged on the rear side and extending left and right, a left frame 31D arranged on the left side and extending front and rear, and a right frame arranged on the right side and extending front and rear The frame 31E is roughly configured. In the front, rear, left, and right frames 31B, 31C, 31D, and 31E, two left and right vertical reinforcing members 31F and 31G that extend in the front and rear directions, and the left and right directions 4 extend. The horizontal reinforcing members 31H are provided in a lattice shape.

  Of the front side of the ceiling panel 31A, 3 between the left frame 31D and the left vertical reinforcing member 31F, between the left and right vertical reinforcing members 31F and 31G, and between the right vertical reinforcing member 31G and the right frame 31D. A suction port 31J through which conditioned air blown out from the air outlets 26, 27, and 28 is sucked as inside air is provided at the location. Among the horizontal reinforcing members 31H, three positions between the left frame 31D and the left vertical reinforcing member 31F, between the left and right vertical reinforcing members 31F and 31G, and between the right vertical reinforcing member 31G and the right frame 31D Are provided with ventilation holes 31K through which the inside air sucked from the suction port 31J passes.

  Of the left and right vertical reinforcing members 31F and 31G, the rear side of the rearmost horizontal reinforcing member 31H flows through the ventilation holes 31K of the horizontal reinforcing members 31H and flows to the rear side of the ceiling panel 31A. A ventilation hole 31L through which the inside air passes is provided. Of the rear frame 31C, between the left frame 31D and the left vertical reinforcing member 31F, there is provided a ventilation hole 31M through which the inside air passes from the front side to the rear side with the rear frame 31C sandwiched in front and rear. A ventilation hole 31N that allows the inside air to pass from the ceiling circulation path 30 to the first side plate circulation path 32 to be described later is provided in a portion on the rear side of the rear frame 31C in the ceiling panel 31A.

  The ceiling inner cover 31 is attached to the ceiling plate 16 and the column 14A, for example, using fixing means such as welding and bolting. In a state where the ceiling inner cover 31 is attached to the lower side of the ceiling board 16, the ceiling board 16 is covered with the ceiling inner cover 31 almost entirely on the lower side thereof. Thereby, the ceiling circulation path 30 can be provided under the ceiling board 16 so as to cover the overhead of the operator.

  The conditioned air generated in the air conditioner 22 and blown out from the outlets 26, 27, and 28 passes through the surroundings of the operator and the like, and then from each inlet 31J of the ceiling panel 31A as shown by an arrow D in FIG. The inside air is sucked as inside air, and the inside air flows from the front side to the rear side through the ceiling circulation path 30, that is, between the ceiling plate 16 and the ceiling panel 31A.

  At this time, the inside air can cool the ceiling board 16 heated by, for example, direct sunlight. Thereby, the temperature rise on the ceiling side of the cab 13 due to direct sunlight can be suppressed, and the operating environment (living environment) of the operator can be maintained in a comfortable state. Further, when the hydraulic excavator 1 is used in a cold district or the like, the ceiling plate 16 can be warmed (heated) by the inside air passing through the ceiling circulation path 30, and the temperature decrease on the ceiling side of the cab 13 can also be suppressed. . For this reason, also from this aspect, the operator's operating environment can be maintained in a comfortable state.

  32 is a first side plate circulation path as a side plate circulation path connected to the downstream side of the ceiling circulation path 30, and the first side plate circulation path 32 is the side plate 17 that forms the cab 13, more specifically, It is located inside (corner corner) between the left side plate 17C and the rear plate 17B. The first side plate circulation path 32 circulates the inside air that has passed through the ceiling circulation path 30 along the left side plate 17C and the rear plate 17B.

  Here, the entire first side plate circulation path 32 is formed by a connection box 32A having a substantially inverted L shape (substantially J shape). As the connection box 32A, for example, a hollow tubular duct (pipe) made of metal or synthetic resin, a box (box), or the like can be used. Further, the connection box 32A is provided with a side plate cover such as a lining so as to face the inner side (inner side) of the side plate 17 (the left side plate 17C and the rear side plate 17B) with a gap (the side plate 17 has a double structure). What formed the inside (gap between the side plate 17 and the side plate cover) as a flow path (ventilation path) through which air passes can also be used.

  The connection box 32A forming the first side plate circulation path 32 is disposed so that the upstream side 32B extends upward and downward, and the downstream side 32C extends so as to extend forward and backward. Yes. As a result, the connection box 32A covers substantially the entire portion of the left side plate 17C other than the rear left window 17H on the rear side of the driver's seat 18 (the rear side of the front left window 17G) and the rear plate 17B. Of these, the portion on the left side of the auxiliary seat 21 is covered almost entirely.

  More specifically, the upstream side 32B of the connection box 32A extends from the ventilation hole 31N of the ceiling panel 31A to the inside (corner corner) of the left side plate 17C and the rear side plate 17B, that is, the rear left side of the left side plate 17C. The part which is the rear side of the window 17H and the part which is the left side of the auxiliary seat 21 in the rear plate 17B is disposed so as to extend upward and downward. On the other hand, the downstream side 32C of the connection box 32A is disposed so as to extend in the left and right directions through a portion of the left side plate 17C that is below the rear left window 17H. The downstream end of the connection box 32A is connected to the ventilation hole 14C of the floor board 14.

  Inside the connection box 32A forming the first side plate circulation path 32, the inside air flows as indicated by an arrow E in FIGS. That is, the inside air that has passed through the ceiling circulation path 30 and has flowed into the connection box 32A from the ventilation holes 31N of the ceiling panel 31A flows from the upper side 32B toward the lower side of the connection box 32A, and passes through the downstream side 32C. It flows from the rear side to the front side.

  At this time, the inside air can cool the left side plate 17C and the rear side plate 17B heated by, for example, direct sunlight. Further, when the hydraulic excavator 1 is used in a cold district or the like, the left side plate 17C and the rear side plate 17B can be warmed by the inside air. Thereby, the temperature fall at the time of using in the temperature rise or cold district etc. of the left side surface or the rear surface side of the cab 13 due to direct sunlight can be suppressed.

  In this case, the connection box 32 </ b> A that forms the first side plate circulation path 32 is provided in a portion of the left side plate 17 </ b> C that is behind the driver seat 18. For this reason, the back side of the operator seated on the driver's seat 18 can be stably held at a comfortable temperature state by the inside air passing through the first side plate circulation path 32.

  Further, the left side plate 17C is configured to cover portions other than the front left window 17G and the rear left window 17H with the connection box 32A and the blowout box 23B. For this reason, substantially the entire left side plate 17C, that is, the left side plate 17C is formed by the inside air passing through the connection box 32A (first side plate circulation path 32) and the conditioned air passing through the blowout box 23B (supply path 23). Of these, parts other than the left windows 17G and 17H can be reliably cooled or warmed.

  Further, the rear plate 17B is configured to cover portions other than the door 17F and the back side of the auxiliary seat 21 with the connection box 32A and the blowing box 25B. For this reason, substantially the entire rear plate 17B, that is, the rear plate 17B is formed by the inside air passing through the connection box 32A (first side plate circulation path 32) and the conditioned air passing through the blowing box 25B (supply path 25). Of these, the parts other than the door 17F and the back side of the auxiliary seat 21 can be reliably cooled or warmed.

  Reference numeral 33 denotes a second side plate circulation path as another side plate circulation path provided separately from the first side plate circulation path 32, and the second side plate circulation path 33 is more specifically the side plate 17 forming the cab 13. Specifically, it is located inside the right side plate 17D. And the 2nd side board circulation path 33 circulates along the right side board 17D as the conditioned air which blown off from the blower outlets 26, 27, 28 as inside air.

  Here, the entire second side plate circulation path 33 is formed by a substantially I-shaped suction box 33A. As the connection box 32A, for example, a hollow tubular duct (pipe) made of metal or synthetic resin, a box (box body), or the like can be used for the suction box 33A. Further, the suction box 33A is provided with a side plate cover such as a lining so as to face, for example, the inner side (inner side) of the side plate 17 (right side plate 17D) (the side plate 17 has a double structure), and the inside (side plate 17). It is also possible to use one formed as a flow path (ventilation path) through which air passes through a gap between the cover and the side plate cover.

  The suction box 33A that forms the second side plate circulation path 33 covers substantially the entire portion of the right side plate 17D that is on the rear side of the driver seat 18. That is, the suction box 33A is disposed so as to extend upward and downward in a portion of the right side plate 17D that is the rear side of the upper right window 17J. A suction port 33B is provided at the upper end (upstream end) of the suction box 33A so that conditioned air blown from the blowout ports 26, 27, and 28 is sucked as inside air.

  The conditioned air generated in the air conditioner 22 and blown out from the outlets 26, 27, 28 passes through the surroundings of the operator, and is then sucked in as air from the inlet 33B as indicated by an arrow F in FIG. The inside air flows in the suction box 33A (second side plate circulation path 33) from the upper side to the lower side. At this time, the inside air can cool the right side plate 17D heated by, for example, direct sunlight. Further, when the hydraulic excavator 1 is used in a cold district or the like, the right side plate 17D can be warmed by the inside air. Thereby, the temperature fall at the time of using in the temperature rise thru | or the cold region etc. of the right side surface of the cab 13 by direct sunlight can be suppressed.

  In this case, the suction box 33A that forms the second side plate circulation path 33 is provided on the rear side of the driver's seat 18 in the right side plate 17D. For this reason, the back side of the operator seated on the driver's seat 18 can be stably held in a comfortable temperature state by the inside air passing through the second side plate circulation path 33.

  The right side plate 17D is configured to cover portions other than the upper right window 17J and the lower right window 17K with the suction box 33A and the blowout box 24B. For this reason, almost the entire right side plate 17D, that is, the right side plate 17D, is formed by the inside air passing through the suction box 33A (second side plate circulation path 33) and the conditioned air passing through the blowing box 24B (supply path 24). Of these, parts other than the right windows 17J and 17K can be reliably cooled or warmed.

  Reference numeral 34 denotes a floor board circulation path connected to the downstream side of the second side board circulation path 33, and the floor board circulation path 34 is located above the floor board 14 forming the cab 13. The floor board circulation path 34 circulates the inside air that has passed through the second side board circulation path 33 along the floor board 14.

  Here, the floor board circulation path 34 is formed of a floor-side connection box 34A having a substantially I-shape as a whole. Similarly to the connection box 32A, the suction box 33A, etc., for example, a hollow tubular duct (pipe) made of metal or synthetic resin, a box (box body), or the like can be used for the floor side connection box 34A. Further, the floor side connection box 34A may be, for example, one having a floor plate 14 having a double structure (double floor) and a flow passage (ventilation path) through which air passes.

  The floor side connection box 34A that forms the floor board circulation path 34 has a door 17F on the rear side of the driver's seat 18 in the floor board 14 from the connection portion with the lower end of the suction box 33A (the downstream end of the second side board circulation path 33). The part which becomes the front side is arranged so as to extend in the left and right directions. And the left end (downstream end of the floor board circulation path 34) of the floor side connection box 34A is the ventilation hole 14C of the floor board 14 via the front end (downstream end of the first side board circulation path 32) of the downstream side 32C of the connection box 32A. It is connected to the. Thus, as indicated by an arrow F in FIGS. 5 and 6, the inside air that has passed through the suction box 33 </ b> A (second side plate circulation path 33) and flowed into the floor side connection box 34 </ b> A (floor board circulation path 34) It flows from the right side to the left side in the floor side connection box 34A.

  Reference numeral 35 denotes a return circulation path provided by connecting the downstream side of the first side plate circulation path 32 and the air conditioner 22. The return circulation path 35 includes the ceiling circulation path 30 and the first side plate circulation path 32. The inside air that has passed through the second side plate circulation path 33 and the floor board circulation path 34 is returned to the air conditioner 22. Here, the return circuit 35 is formed by a hose 35A. The hose 35A can be, for example, a flexible hose, more specifically, a hose made of rubber, synthetic resin, metal, or the like, or a part or the whole of a bellows-like hose.

  The upstream end of the hose 35 </ b> A that forms the return circulation path 35 is connected to the ventilation hole 14 </ b> C of the floor plate 14, and the downstream end is connected to the filter box 22 </ b> K of the air conditioner 22. The hose 35A is disposed between the ventilation hole 14C of the floor plate 14 and the air conditioner 22 so as to extend in the cab bed 12 upward and downward.

  Reference numeral 36 denotes an outside air inlet provided in a part such as the cab bed 12. The outside air inlet 36, as shown in FIG. 7, puts outside air into the filter box 22 </ b> K when the air conditioner 22 performs the outside air introduction operation. Inhale.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, when the hydraulic excavator 1 is operated, an operator gets on the cab 13 and sits on the driver's seat 18 and operates the surrounding traveling lever / pedal 19, the operation lever 20 and the like to travel and turn the vehicle body, The work device 4 can be operated to perform excavation work such as earth and sand.

  When the operator switches on the air conditioner 22, the compressor 22A is driven by the hydraulic motor 22J, and the air conditioner 22 is activated. Thereby, the cold air cooled by the evaporator 22E and the warm air heated by a heater core (not shown) or the like are mixed according to the air conditioning operation by the operator, and conditioned air of an appropriate temperature is generated. The conditioned air is blown by the blower fan 22F and blows out from the outlets 26, 27, 28 into the cab 13 through the supply passages 23, 24, 25. Therefore, the operator seated in the driver's seat 18 Can be kept at a comfortable temperature.

  Further, after the conditioned air generated by the air conditioner 22 and blown out from the outlets 26, 27, 28 passes around the operator, etc., as shown by arrows D, E in FIGS. The air is sucked from the suction ports 31J of 31A as the inside air, and the inside air flows through the ceiling circulation path 30, the first side plate circulation path 32, and the return circulation path 35 and is returned to the air conditioner 22. At the same time, as indicated by an arrow F in FIGS. 5 and 6, the inside air is sucked in as air from the suction port 33 </ b> B of the suction box 33 </ b> A. It flows through the path 35 and is returned to the air conditioner 22.

  At this time, the inside air can cool, for example, the ceiling plate 16 and the side plates 17 (rear plate 17B, left and right side plates 17C and 17D) heated by direct sunlight. When the excavator 1 is used in a cold district or the like, the ceiling plate 16 and the side plate 17 (the rear plate 17B, the left and right side plates 17C and 17D) can be warmed (heated) by the inside air. Thereby, the temperature fall at the time of using the temperature rise of the cab 13 by a direct sunlight or a cold region can be suppressed.

  Further, when the inside air is circulated between the cab 13 and the air conditioner 22 in this way, the pressure inside the cab 13 can be made difficult to escape to the outside air. Thereby, the pressure in the cab 13 can be made higher (pressurized) than the outside air, and dust such as sand and dust can be prevented from entering the cab 13.

  According to the present embodiment, the temperature increase in the cab 13 due to direct sunlight or the temperature decrease in the cab 13 when used in a cold region can be suppressed, and the operator's operating environment can be maintained in a comfortable state. Furthermore, the infiltration of dust into the cab 13 can be suppressed.

  That is, the first and second side plate circulation paths 32 provided inside the ceiling circulation path 30 and the side plates 17 (rear plate 17B, left and right side plates 17C and 17D) provided to cover the operator's head. When the inside air flows through 33, both the ceiling plate 16 and the side plates 17 (the rear plate 17B, the left and right side plates 17C and 17D) heated by the direct sunlight can be cooled. Further, when the excavator 1 is used in a cold district or the like, both the ceiling plate 16 and the side plates 17 (the rear plate 17B, the left and right side plates 17C, 17D) can be warmed by the inside air. As a result, compared to the prior art, the temperature rise in the cab 13 due to direct sunlight and the temperature drop in the cab 13 when used in cold districts can be sufficiently suppressed, and the operating environment of the operator can be maintained in a comfortable state. it can.

  In addition, since the inside air flowing through the ceiling circulation path 30 and the first and second side plate circulation paths 32 and 33 is returned to the air conditioner 22 through the return circulation path 35, the pressure inside the cab 13 is prevented from escaping to the outside air. can do. Thereby, the pressure in the cab 13 can be stably made higher (pressurized) than the outside air, and entry of dust such as sand and dust into the cab 13 can be sufficiently suppressed.

  According to the present embodiment, since the second side plate circulation path 33 is provided in addition to the ceiling circulation path 30 and the first side plate circulation path 32, the first side plate circulation path 32 and the second side plate circulation are provided. The side plate 17 (the rear plate 17B, the left and right side plates 17C, 17D) can be cooled by the internal air flowing through both the side plate circulation paths 32, 33 with the passage 33 (two systems). For this reason, the temperature rise in the cab 13 due to direct sunlight and the temperature drop in the cab 13 when used in a cold region can be more reliably suppressed, and the operating environment of the operator can be stably maintained in a comfortable state. it can.

  In addition, according to the present embodiment, the lower side of the ceiling plate 16 is configured to be entirely covered by the ceiling circulation path 30 formed by the ceiling plate 16 and the ceiling inner cover 31. The inside of the left side plate 17C is entirely covered by a connection box 32A that forms the first side plate circulation path 32 and an outlet box 23B that forms the supply path 23, except for the front left window 17G and the rear left window 17H. It has a configuration. The inside of the right side plate 17D is entirely covered by a suction box 33A that forms the second side plate circulation path 33 and an outlet box 24B that forms the supply path 24, except for the upper right window 17J and the lower right window 17K. It has a configuration. Further, the inner side (front side) of the rear plate 17B is entirely composed of a connection box 32A that forms the first side plate circulation path 32 and a blowout box 25B that forms the supply path 25, except for the door 17F and the back side of the auxiliary seat 21. It is the structure which covers. For this reason, the ceiling board 16, left, right by the inside air passing through the ceiling circulation path 30, the first side plate circulation path 32, the second side plate circulation path 33 and the conditioned air passing through the supply paths 23, 24, 25. The side plates 17C and 17D and the rear plate 17B can be stably cooled or heated throughout.

  According to the present embodiment, the first and second side plate circulation paths 32 and 33 are arranged on the rear side of the driver's seat 18 in the side plate 17, that is, on the left and right side plates 17C and 17D and the rear plate 17B. It is set as the structure which provides. For this reason, the back side of the operator seated on the driver's seat 18 can be stably held at a comfortable temperature state by the inside air passing through the first and second side plate circulation paths 32 and 33.

  According to the present embodiment, the high cab type hydraulic excavator 1 that supports the cab 13 at a high position via the cab bed 12 is used. However, even if the cab 13 is heated by direct sunlight, the ceiling circulation path 30 and the first excavator 1 The ceiling plate 16 and the side plate 17 (the rear plate 17B, the left and right side plates 17C, 17D) can be stably cooled by the internal air passing through the second side plate circulation paths 32, 33. For this reason, even if it is the high cab type hydraulic excavator 1 which is easy to receive direct sunlight and the temperature in the cab 13 is likely to rise, the inside air passing through the ceiling circulation path 30 and the first and second side plate circulation paths 32 and 33. Thus, the inside of the cab 13 can be stably held at a comfortable temperature state.

  In the above-described embodiment, an example has been described in which the second side plate circulation path 33 as another side plate circulation path is provided inside the right side plate 17D. However, the present invention is not limited to this. For example, in addition to the second side plate circulation path 33, the third side plate circulation path 41 as another side plate circulation path is provided on the left side as in the modification shown in FIG. It is good also as a structure provided inside the faceplate 17C.

  In this case, like the second side plate circulation path 33, the third side plate circulation path 41 can be formed by a suction box 41A having a substantially I shape as a whole. Specifically, the suction box 41A may be a hollow tubular duct (pipe) made of metal or synthetic resin, a box (box), or the like. In addition, the suction box 41A is provided with a side plate cover such as a lining so as to face the inner side (inner side) of the side plate 17 (left side plate 17C) with a gap (the side plate 17 has a double structure), and the inside (side plate 17). It is also possible to use one formed as a flow path (ventilation path) through which air passes through a gap between the cover and the side plate cover.

  And the suction port 41B in which the conditioned air blown from the blower outlets 26, 27, and 28 is sucked as inside air is provided on the upstream side of the suction box 41A, and the downstream side of the suction box 41A is the downstream side of the connection box 32A. Connect to 32C. As a result, the inside air sucked from the suction port 41B flows from the upper side to the lower side of the third side plate circulation path 41 as shown by an arrow G in FIG. 8, and passes through the first side plate circulation path 32 and the like. The inside air is joined and returned to the air conditioner 22 via the return circuit 35.

  In the above-described modification, the second side plate circulation path 33 and the third side plate circulation path 41 as other side plate circulation paths are provided on both the inside of the right side plate 17D and the inside of the left side plate 17C. Explained with an example. However, the present invention is not limited to this, and for example, another side plate circulation path may be provided only inside the right side plate. Further, another side plate circulation path may be provided on the inner side (front side) of the rear plate or the inner side (rear side) of the front plate. That is, the other side plate circulation path can be provided in at least one of the front plate, the rear plate, and the left and right side plates that form the side surface of the cab.

  In the embodiment described above, the ceiling of the cab 13 is formed in a double structure (double ceiling) by the ceiling plate 16 and the ceiling inner cover 31, and is formed between the ceiling plate 16 and the ceiling inner cover 31. The case where the gap is the ceiling circulation path 30 through which the inside air passes is described as an example. However, the present invention is not limited to this. For example, by providing a hollow tubular duct (pipe) made of metal, synthetic resin, or the like, a box (box), or the like on the lower side of the ceiling plate, the ceiling circulation path May be formed.

  That is, the ceiling circulation path, the side plate circulation path, the other side plate circulation path, the floor board circulation path, and the supply path provided in the cab can be formed using, for example, a hollow tubular duct, a box, or the like. A ceiling inner cover or side plate cover such as a lining is provided so as to face the inner side (inside the room) with a gap (the ceiling plate or side plate has a double structure), and the inside (the gap between the ceiling plate and the ceiling inner cover) Or a gap between the side plate and the side plate cover) can be formed as a flow passage (air passage) through which air passes.

  In the above-described embodiment, the large-sized high cab type hydraulic excavator 1 has been described as an example. However, the present invention is not limited to this, and for example, a cab is provided on a revolving frame (directly without a cab bed). You may apply to the hydraulic excavator which is not a high cab type | mold.

  Further, in the above-described embodiment, the hydraulic excavator 1 including the crawler type lower traveling body 2 is described as an example of the construction machine. However, the present invention is not limited to this, and can also be applied to other construction machines such as a hydraulic excavator provided with a wheel-type lower traveling body and a hydraulic crane.

1 Excavator (construction machine)
2 Lower traveling body (car body)
3 Upper swing body (car body)
4 Working device 5 Swivel frame 12 Cab bed 13 Cab 13A Driver's room 16 Ceiling plate 17 Side plate 17C Left side plate 17D Right side plate 18 Driver's seat 22 Air conditioner 23, 24, 25 Supply path 26, 27, 28 Outlet 30 Ceiling circulation path 32 First side plate circulation path (side plate circulation path)
33 Second side plate circulation path (other side plate circulation path)
35 Return circuit 41 Third side plate circuit (other side plate circuit)

Claims (4)

A vehicle body on which a working device is provided, a cab that forms part of the vehicle body and that surrounds a floor plate and a ceiling plate with a side plate to define a driver's cab, and an operator seated in the cab. A seat, an air conditioner that generates conditioned air comfortable for an operator, a supply path that connects the air conditioner and the cab's cab and supplies conditioned air generated by the air conditioner to the cab; In a construction machine provided with a blowout port that is provided on the downstream side of the supply path and blows out the conditioned air to the cab.
A ceiling circulation path located under the ceiling board forming the cab and covering the overhead of the operator and circulated along the ceiling board as conditioned air blown out from the air outlet;
A side plate circulation path that is located on the inner side of the side plate that forms the cab and is connected to the downstream side of the ceiling circulation path, and inside air that has passed through the ceiling circulation path circulates along the side plate;
A construction machine comprising: a return circulation path that is provided by connecting between the downstream side of the side plate circulation path and the air conditioner and returns inside air that has passed through the side plate circulation path to the air conditioner. . Provided another side plate circulation path that is located inside the left side plate and / or the right side plate among the side plates that form the cab and circulates along the side plate as conditioned air blown out from the outlet.
The construction machine according to claim 1, wherein the other side plate circulation path is configured to connect a downstream side thereof to an upstream side of the return circulation path.   The construction machine according to claim 1, wherein the side plate circulation path is configured to be provided in a portion of the side plate on the rear side of the driver seat. The vehicle body comprises a self-propelled lower traveling body and an upper revolving body mounted on the lower traveling body so as to be capable of turning,
The upper swing body includes a swing frame that forms a support structure, a cab bed provided on the swing frame, the cab provided on the cab bed, and the air conditioning provided in the cab bed. With the equipment,
The construction machine according to claim 1, 2, or 3, wherein the return circulation path is arranged in the cab bed via a floor plate of the cab.

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