JP2002339405A - Cab for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change a preset temperature in a cab box while operating an operation lever. SOLUTION: Temperature adjusting switches 32, 33, and 34 are arranged in a grip part 17B of the operation lever 17. These temperature adjusting switches 32, 33, and 34 are connected to a control unit 36. The control unit 36 arithmetically operates in which degree of the air volume hot air or cold air is blown from either of air blowing ports 29, 30A, 30B, 31 according to detecting signals from a room temperature sensor 37, a water temperature sensor 38, an outside air temperature 39, and a solar radiation sensor 40 for allowing a temperature in the cab box 12 to reach the preset temperature T inputted from the temperature adjusting switches 32, 33, and 34, and outputs this arithmetically operated control signal to an air conditioner 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cab for construction equipment provided with an air conditioning unit for cooling and heating the inside of a cab box such as a hydraulic shovel.

[0002]

2. Description of the Related Art Generally, construction machines such as hydraulic excavators are
A lower traveling body, an upper revolving body provided rotatably on the lower traveling body, and a working device for excavating soil and the like provided on the front side of the upper revolving body so as to be capable of ascending and descending, A cab as an operator's cab is provided on the frame of the upper swing body.

Here, a cab for a hydraulic excavator is provided with a cab box provided on a frame of an upper revolving structure and defining an operation cab therein, and a driver seat provided on a floor plate in the cab box. An operation lever device is provided on at least one of the left and right sides of the driver's seat, and an operation lever is provided so as to be tiltable.

[0004] Then, the operator sits in the driver's seat,
By tilting the operation levers provided on the left and right operation lever devices, the lower traveling body is driven, and the work device is operated to excavate earth and sand.

In the prior art, there is known a cab equipped with an air conditioning unit called an auto air conditioner. The automatic air conditioner automatically adjusts the temperature inside the cab to reach and maintain a preset temperature, thereby improving the comfort of the operator inside the cab.

[0006]

By the way, in the above-mentioned prior art, the comfort inside the cab is increased and maintained by using an automatic air conditioner to reach and maintain the set temperature. Then, when the sunshine increases during the work or when the sunshine weakens, the operator feels hot or cold. At that time, the operator needs to change the set temperature by operating the operation panel of the automatic air conditioner.

However, in the case of a hydraulic excavator, the operator must always operate the left and right operation levers. As described above, when operating the operation panel of the automatic air conditioner,
It is necessary to temporarily suspend the operation of the operation lever, which causes a problem that the operability of the operation lever is reduced.

[0008] Usually, the operation panel of the auto air conditioner is arranged in a position where the switches are difficult to see or are difficult to handle for the operator during operation. In such a case, it is necessary for the operator to temporarily stop the operation of operating the operation lever and then operate the operation panel while shifting his / her line of sight, which causes a problem that the operability of the operation lever is reduced.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention can change the set temperature in the cab box while operating the operation lever, and can improve the operability of the operation lever. It is an object of the present invention to provide a cab for a construction machine provided with an air conditioner capable of improving the cab and improving comfort in the cab.

[0010]

In order to solve the above-mentioned problems, a cab for a construction machine according to the present invention includes a cab box provided on a frame of a construction machine and defining an operator's cab therein; A driver's seat provided on the floorboard and located inside the control lever, an operation lever device disposed on at least one of the left and right sides of the driver's seat, and provided with an operation lever capable of tilting operation; An air conditioning unit provided in the cab box to blow conditioned air from a duct.

A feature of the structure adopted by the invention of claim 1 is that the operating lever has a temperature for adjusting the temperature of the conditioned air blown from the air conditioning unit so as to reach a predetermined set temperature. The configuration is such that an adjustment switch is provided.

With this configuration, since the temperature control switch is provided on the operation lever of the control lever device, the operator sitting on the driver's seat can easily confirm the position of the temperature control switch from the driver's seat side. The operation of the temperature adjustment switch can be performed smoothly. By operating the temperature adjustment switch, the conditioned air from the air conditioning unit can be blown into the cab box, and the inside of the cab box can be maintained at a comfortable temperature.

The invention according to claim 2 is configured such that the temperature adjustment switch is provided on a grip portion of the operation lever which is gripped by an operator. With this configuration, the operator can easily operate the temperature adjustment switch while holding the grip portion of the operation lever.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A construction machine cab according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings, taking an example in which the cab is applied to a hydraulic shovel.

FIGS. 1 to 6 show an embodiment of the present invention. Reference numeral 1 denotes a hydraulic shovel applied to the present embodiment. The hydraulic shovel 1 includes a lower traveling body 2 and a lower traveling An upper revolving superstructure 3 rotatably mounted on the body 2,
A working device 4 provided on the upper swing body 3 so as to be able to move up and down.
And is constituted by. The working device 4 includes a boom 4A, an arm 4B, a bucket 4C, and the like.
This bucket 4C performs excavation work for earth and sand.

The upper revolving unit 3 has a revolving frame 5 on which a cab 11 described later,
A building cover 6 located behind the cab 11 and containing an engine, a hydraulic pump (not shown), and the like;
And a counterweight 7 located on the rear side of the counterweight.

Here, the cab 11 according to the present embodiment is described.
Is substantially constituted by a cab box 12 defining an operator's cab, a driver's seat 14 described later in the cab box 12, an operation lever device 15, and an air conditioning unit 28.

As shown in FIG. 2, the cab box 12 has an upper surface 12A, a front surface 12B, and a rear surface 12B.
C, and is formed as a box-shaped body composed of the left side surface portion 12D and the right side surface portion 12E. The lower surface (bottom) of the cab box 12 is partitioned by a floor plate 13 and
2B, rear surface 12C, left side 12D and right side 1
The lower end side of 2E is configured to surround the floor plate 13 from outside.

Reference numeral 14 denotes a driver's seat located in the cab box 12 and provided on the floor plate 13.
The left and right operation lever devices are provided on the floor plate 13 on both left and right sides of the lever stand 16. The operation lever device 15 projects obliquely upward from the lever stand 16 and the front end side of the lever stand 16. It is substantially constituted by the operation lever 17.

Here, the lever stand 16 is formed as a hollow box, and is mounted on the floor plate 13 of the cab box 12 so as to be located in the side direction of the driver's seat 14. Various instruments, switches (not shown), and the like are attached to the lever stand 16.

The operating lever 17 has a shaft 17A whose lower end is swingably mounted in a lever stand 16.
A grip 17B attached to the upper end of the shaft 17A, and a dustproof cover 17C that covers the shaft 17A from outside.
It is composed of Further, temperature adjustment switches 32, 33, which will be described later, are provided at the tip portion 17B1 of the grip portion 17B.
There is provided a switch mounting member 17D to which the switch 34 is mounted.

Further, inside the grip portion 17B, there is provided a wiring passage 17E for leading a wiring 35 to be described later from the temperature adjustment switches 32, 33 and 34 to the control unit 36 side. Then, the operator grips the grip portions 17B of the left and right operation levers 17 while sitting on the driver's seat 14 to thereby operate the operation levers 17.
Is performed.

Numeral 18 denotes an air conditioner for blowing cold or warm air as conditioned air into the cab box 12. The air conditioner 18 includes a compressor 21, a condenser 22, a radiator 27 and an air conditioning unit 28, which will be described later. It is roughly configured by:

Reference numeral 19 denotes a refrigerant pipe through which the refrigerant flows.
Evaporator 20, compressor 21, condenser 22, refrigerant tank 23 and expansion valve 24
Etc. are provided. Reference numeral 25 denotes a hot water pipe through which cooling water for the engine flows. In the middle of the hot water pipe 25, a heater core 26, a radiator 27, a hot water valve (not shown), and the like are provided.

Here, the evaporator 20 constitutes an air conditioning unit 28 which is an indoor unit of the air conditioner 18 together with the heater core 26, and is disposed behind the driver's seat 14. The air conditioning unit 28 includes a hot water valve and the compressor 2.
By selectively operating one of the air outlets 1, hot air or cold air is blown by a blower fan 28 </ b> A through a duct (not shown), the blower port 29 below the driver's seat 14, the front blower ports 30 </ b> A, 30 </ b> B, and the rear blower port. Side air vents 31, 31,
.. Are blown into the cab box 12.

The compressor 21, the condenser 22, the refrigerant tank 23, the expansion valve 24 and the radiator 27 are arranged on the engine side of the upper revolving unit 3 and constitute an outdoor unit of the air conditioner 18.

Reference numerals 32, 33, and 34 denote first, second, and third temperature adjustment switches provided at, for example, the tip portion 17B1 of the grip portion 17B of the right operation lever 17. These temperature adjustment switches 32, 33, and 34 are , Are mounted side by side on the switch mounting member 17D of the grip portion 17B, and are connected to a control unit 36 to be described later using wiring 35 and the like. And the temperature adjustment switches 32, 33, 34
The switch operation is performed while the operator sitting on the driver's seat 14 holds the grip portion 17B of the operation lever 17.

Here, the first temperature adjustment switch 32 is
Each time the switch is operated once, the set temperature T is set to, for example, 1
The control unit 36 controls the control signal to increase by degrees.
And the conditioned air (cool air, hot air) blown from the air conditioning unit 28 is adjusted so as to reach the set temperature T. The second temperature adjusting switch 33 outputs a control signal to the control unit 36 for decreasing the set temperature T, for example, once each time the switch is operated once.

Further, the third temperature adjustment switch 34
By operating a switch, a control signal for resetting the set temperature T to a predetermined standard set temperature T0 (for example, 25 degrees) is output to the control unit 36.

Reference numeral 36 denotes a control unit mounted in the lever stand 16 of the operation lever device 15. The control unit 36 includes a detection signal from a room temperature sensor 37 for detecting the temperature in the cab box 12, a cooling system for the engine. The detection signal from the water temperature sensor 38 for detecting the temperature of the water, the detection signal from the outside air temperature sensor 39 for detecting the temperature outside the cab box 12, and the cab box 1
The detection signal from the solar radiation sensor 40 which detects the amount of solar radiation to 2 is each input.

The control unit 36 controls the temperature in the cab box 12 by the temperature adjustment switches 32 and 3.
In order to reach the set temperature T inputted from the air outlets 3 and 34, hot air or cold air is blown at any air flow rate and at any outlet 2.
Whether to send air from 9, 30A, 30B, 31 is calculated according to detection signals from the sensors 37, 38, 39, 40, and the calculated control signal is output to the air conditioner 18 via the wiring 41. .

The hydraulic shovel according to the present embodiment has the above-described configuration. Next, the operation of the hydraulic shovel will be described.

First, when performing an excavation operation or the like, the operator sitting on the driver's seat 14 can use the left and right operating levers 17.
Is tilted, the lower traveling body 2 is caused to travel, or the work device 4 or the like is operated to excavate earth and sand by the bucket 4C.

When the temperature in the cab box 12 decreases with a change in the air temperature, the temperature adjustment switch 3
2 is operated to increase the set temperature T. As a result, a control signal based on the set temperature T is output to the control unit 36, and a control signal calculated by the control unit 36 is output to the air conditioner 18 according to the control signal and the like, so that hot air from the air conditioning unit 28 is discharged. Air is blown from the outlets 29, 30A, 30B, 31 and the like, and the inside of the cab box 12 can be maintained at a comfortable temperature state.

When the temperature in the cab box 12 rises, the temperature adjustment switch 33 is operated to lower the set temperature T, so that the cool air from the air conditioning unit 28 blows out the outlets 29, 30A, 30B, 30B. The air is blown from 31 and the like, and in this case, the inside of the cab box 12 can be maintained at a comfortable temperature state.

When the temperature inside the cab box 12 is maintained at a standard set temperature T0, for example, at room temperature of 25 degrees, the set temperature T output to the control unit 36 is controlled by operating the temperature adjustment switch 34. The temperature can be reset to the standard set temperature T0, and the temperature in the cab box 12 can be maintained at the set temperature T0.

Thus, in the present embodiment, the temperature adjusting switches 32, 33, and 34 are provided on the operating lever 17, so that the operator seated on the driver's seat 14 operates the temperature adjusting switches 32, 33, and 34 to operate. The temperature can be easily checked from the seat 14 side, and the operation of the temperature adjustment switches 32, 33, 34 can be smoothly performed when the set temperature T is changed.

Further, in the present embodiment, the temperature adjustment switches 32, 33, and 34 are moved to the grip portion 1 of the operation lever 17.
7B, the operator operates the operating lever 1 when tilting the operating lever 17.
The temperature adjustment switches 32, 33, and 34 can be easily operated with, for example, one finger while holding the device 7, and the operability of the temperature adjustment switches 32, 33, and 34 can be further improved.

In the embodiment, the temperature adjustment switches 32, 33, and 34 are set to the grip portion 17B of the operation lever 17.
In the above description, the temperature control switches 32 ', 33', and 34 'are connected to the grip 17B as shown by phantom lines in FIG. A configuration may also be provided at an intermediate portion in the length direction.

In the embodiment, the case where the temperature adjustment switches 32, 33, and 34 are provided on the right operation lever 17 has been described as an example. Alternatively, for example, the temperature adjustment switch may be provided on the left operation lever 17. A switch may be provided, or both the left and right operation levers 17 may be provided.

Furthermore, in the embodiments, the description has been made by taking a hydraulic shovel as an example of a construction machine, but the present invention is not limited to this and can be widely applied to other construction machines such as a hydraulic crane.

[0042]

As described above in detail, according to the first aspect of the present invention, the operating lever is provided with a temperature for adjusting the temperature of the conditioned air blown from the air conditioning unit so as to reach a predetermined set temperature. Because it was configured to provide an adjustment switch,
The operator sitting in the driver's seat can easily check the position of the temperature adjustment switch, can operate the temperature adjustment switch smoothly, and can improve the operability of the temperature adjustment switch.

In the invention of claim 2, the temperature adjustment switch is provided on the grip portion of the operation lever.
When tilting the operation lever, the operator can easily operate the temperature adjustment switch with, for example, one finger while holding the grip portion of the operation lever, thereby further improving the operability of the temperature adjustment switch. .

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic excavator according to an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view showing the inside of a cab in FIG. 1 in an enlarged manner.

FIG. 3 is an enlarged front view of the operation lever device viewed from a direction indicated by arrows III-III in FIG. 2;

FIG. 4 is an enlarged longitudinal sectional view showing a distal end portion of an operation lever in FIG. 3;

FIG. 5 is a plan view of the operation lever as viewed from a direction indicated by arrows VV in FIG. 4;

FIG. 6 is an air conditioning circuit diagram showing an operation lever device, an air conditioning device, and various sensors used in the embodiment.

[Explanation of symbols]

Reference Signs List 11 cab 12 cab box 13 floor plate 14 driver's seat 15 operation lever device 17 operation lever 17B grip section 18 air conditioner 28 air conditioner unit 32, 32 ', 33, 33', 34, 34 'temperature adjustment switch

Continuing from the front page (72) Inventor Tsuyoshi Sakyo 650 Kandamachi, Tsuchiura-shi, Ibaraki F-term in the Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd. (Reference) 2D003 AA01 AB07 AC06 BA01 DA04 EA01 2D015 EC01

Claims (2)

[Claims] 1. A cab box provided on a frame of a construction machine and defining a driver's cab therein, a driver seat located in the cab box and provided on a floor plate, and left and right of the driver seat A construction comprising: an operation lever device disposed on at least one of the two sides and provided with an operation lever capable of tilting operation; and an air conditioning unit provided in the cab box and blowing conditioned air from a duct. In the machine cab, the operation lever is provided with a temperature adjustment switch for adjusting the temperature of the conditioned air blown from the air conditioning unit to reach a predetermined set temperature. Cab for machinery. 2. The cab for a construction machine according to claim 1, wherein the temperature adjustment switch is provided on a grip portion of the operation lever gripped by an operator.