Construction machinery cab

Abstract

To provide a cab of a construction machine capable of suppressing an indoor temperature rise with a simple structure and keeping an operator's operating environment comfortable.SOLUTION: In a cab mounted on an upper revolving body of a construction machine and provided with a frame structure 15 defining an operator's cab S therein, the frame structure has support pipes 24, 25, 26, and 27 erected at the four corners of the front, rear, left, and right of the cab, and beam pipes 28 and 29 that span between the upper ends of the front and rear support pipes. Ventilation pipes T1 and T2 are formed inside the pipe-like connection of the support pipe and the beam pipe. The support pipes 24 and 26 are provided with fans 35 and 36 for creating air flow in the ventilation pipes T1 and T2. The beam pipes 28 and 29 are provided with ventilation holes 37 and 38 for communicating the ventilation pipes T1 and T2 and the driver's cab S with each other. Also, registers 39 and 40 that can be opened and closed are attached to the ventilation holes 37 and 38, and the registers are provided with switches for operating the fans 35 and 36 in conjunction with the opening operation.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cab for a construction machine, and more particularly to a cab for a construction machine that is provided with an outside air intake passage for introducing outside air into the cab. [Background technology]

[0002] Generally, industrial vehicles equipped with various types of work equipment such as cargo handling equipment and excavation equipment are provided with a cooling structure for cooling heat-generating components such as engines, electric motors, etc. One example of a cooling structure is an air-cooled type, which has a simple structure, and is provided with a duct engaging portion with a louver in a through hole provided in the outer wall of the vehicle body, and the connecting end of a duct (outside air intake passage) is engaged with the engaging portion so that outside air can be introduced into a desired location inside the vehicle body (see, for example, Patent Document 1).

[0003] Among the above-mentioned industrial vehicles, construction machines such as excavators, cranes, and pile drivers have a cab, which serves as a driver's compartment, mounted on a rotating upper body. To protect the operator inside the cab, the driver's seat is enclosed by a framework structure primarily made of hollow tubular materials, and parts such as doors and window glass are attached to this framework (see, for example, Patent Document 2). Because these box-shaped cabs are constructed with the minimum amount of space necessary for driving and operation, they tend to trap heat and are susceptible to heat transfer from adjacent engine compartments and other areas. Therefore, ventilation inside the cab is generally achieved by opening the windows. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-347435 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-114219 Summary of the Invention [Problem to be solved by the invention]

[0005] Opening the windows for ventilation can easily allow rainwater and construction dust to get into the cab, and at night, insects are often attracted by the light and heat emitted by construction machinery. Therefore, ventilation inside the cab with the windows closed has become increasingly important in recent years as a measure to reduce the burden and discomfort of the operator. However, adopting the duct structure of Patent Document 1 in cab ventilation design can potentially constrict the space around the driver's seat and require the installation of dedicated louvers, which can also increase costs. The location of the air outlet is particularly important to the operator, and meeting such air direction requirements places stricter requirements on placement.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a cab for a construction machine that has a simple structure and is capable of suppressing an increase in temperature inside the cab, thereby maintaining a comfortable driving environment for the operator. [Means for solving the problem]

[0007] In order to achieve the above object, the cab of the construction machine of the present invention is a cab that is mounted on an upper rotating body of the construction machine and has a framework structure that defines an operator's cab inside, the framework structure having support pipes erected at the four corners of the operator's cab, front, rear, left and right, and a beam pipe that is hung between the upper ends of the front and rear support pipes, and an air duct is formed inside at least one of the support pipes and the beam pipe that is connected in a piping manner, the support pipe is provided with a fan that creates an air flow in the air duct, and the beam pipe is provided with an air vent that communicates the air duct with the operator's cab. The vent is provided with a register that can be opened and closed, and the register has a switch that operates the fan in conjunction with the opening operation. It is characterized by the following.

[0008] Also ,before The fan is an intake fan that draws in outside air from an opening at the lower end of the support pipe, and is characterized in that the intake fan is provided on the support pipe located farthest from the rotation axis of the upper rotating body among the front, rear, left and right support pipes.

[0009] The fan is characterized in that it comprises an intake fan provided on one of the left and right support pipes to draw in outside air from an opening at the bottom of the support pipe, and an exhaust fan provided on the other support pipe to exhaust inside air from an opening at the bottom of the support pipe.Furthermore, the intake fan is provided on the support pipe located farthest from the rotation axis of the upper rotating body among the front, rear, left, and right support pipes, and the exhaust fan is provided on the support pipe located second farthest. [Effects of the Invention]

[0010] According to the construction machinery cab of the present invention, a ventilation duct is formed by connecting support pipes and beam pipes in a piping-like manner in the framework structure that defines the cab. The support pipes are provided with a fan for generating airflow, and the beam pipes are provided with a vent that connects the ventilation duct to the cab. This ensures the airflow path necessary for ventilation within the cabin without the need for a dedicated duct. In other words, a cab that can suppress an increase in cabin temperature with a simple ventilation structure that utilizes existing hollow pipes is achieved. Moreover, the vent located at the top of the cab facilitates the delivery of a refreshing airflow to the operator. Furthermore, the support pipes with vertical ventilation ducts provide a downward opening, eliminating the need for measures to prevent the intrusion of rainwater, noise, etc., making this a low-cost and highly practical product. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a perspective view of a framework structure of a cab of a construction machine showing one embodiment of the present invention. [Figure 2] This is also a side view. [Figure 3] This is also a front view. [Figure 4] FIG. [Figure 5] FIG. 10 is a diagram showing the mounting structure of the register. [Figure 6] FIG. 10 is a diagram showing the fan mounting structure. [Figure 7] 1 is a perspective view of a pile driver, which is an example of a construction machine to which the present invention can be applied. DETAILED DESCRIPTION OF THE INVENTION

[0012] 1 to 6 show an example of a cab for a construction machine according to the present invention. FIG. 7 shows a pile driver, an example of a construction machine to which the present invention can be applied, equipped with a different cab variation. As shown in FIG. 7, the pile driver 11 has an upper rotating body 13 mounted on a crawler-equipped lower track body 12 via a swivel mechanism, and the upper rotating body 13 is rotatable about a rotation axis (rotation center) PV. The cab 14 conforms to design standards for ensuring operator visibility and safety and includes a framework 15 defining an operator's cab. The cab 14 is mounted on one front side of the upper rotating body 13 (the right front side in this embodiment). In this rotating pile driver 11, the cab 14 is positioned forward of the rotation axis PV, improving visibility from the operator's seat and allowing the operator to easily grasp the operating status of the work equipment (not shown) attached to the front of the leader 16 and the conditions at the construction site.

[0013] The framework structure 15, details of which will be described later, is supported by a rectangular floor frame 17a that constitutes the revolving frame body 17, and various parts that contribute to the appearance of the cab 14, such as a front window 18, doors 19, a roof panel 20, and side panels 21, are attached to each surface of the framework. The cab 14 is formed large from front to back so that the rear panel is in close proximity to the front of a house (equipment storage room) 22, and the position of the outer side where the doors 19 are located is continuous with the outer surface of the house 22, thereby defining the vehicle width (transport width) of the pile driver 11. The box-shaped cab 14 formed in this manner maintains its airtightness inside by closing the doors 19 and window glass.

[0014] Although the design of the framework structure 15 varies depending on the specifications of the cab 14, it is basically symmetrical and, for example, as shown in FIGS. 1 to 4, is primarily formed using hollow tubular materials (square pipes) that are easy to fabricate as a framework. The size and shape of the framework structure 15 are roughly determined by the spacing between each member of the cab 14 in the longitudinal direction (the directions of arrows X1 and X2 in FIG. 1), the transverse direction (the directions of arrows W1 and W2 in FIG. 1), and the vertical direction (the directions of arrows V1 and V2 in FIG. 1), forming an operator's cab (space) S large enough to accommodate at least one operator. To facilitate understanding of the framework structure 15, the operator's seat is not shown in FIG. 1, etc. However, from the perspective of the seated operator, the forward direction with an open field of view is indicated by arrow X1, and the reverse direction is indicated by arrow X2. The left side of the traveling direction is indicated by arrow W1, and the right side is indicated by arrow W2.

[0015] The components of the framework structure 15 are roughly composed of a base frame body 23 formed by framing front, rear, left and right base tubes 23a, 23b, 23c, and 23d in a rectangular shape, a left front support tube 24, a left rear support tube 25, a right front support tube 26, and a right rear support tube 27 erected at the four corners of the base frame body 23, i.e., the four corners of the driver's cab S, a left upper beam tube 28 suspended between the upper ends of the left front support tube 24 and the left rear support tube 25, a right upper beam tube 29 suspended between the upper ends of the right front support tube 26 and the right rear support tube 27, and a plurality of angle struts 30 and cross beam tubes 31 which also serve as reinforcing materials.

[0016] As shown in Figures 1 and 4, the base frame 23 has ventilation holes 32 at multiple locations in the center of the upper surface and both ends of the lower surface of the rear base pipe 23b, and when attached to the floor frame 17a, this ensures a path for airflow necessary for ventilation of the driver's cab S.

[0017] As can be seen in Figure 2, the left and right front support pipes 24, 26 have intermediate sections that protrude slightly forward from the front end of the base frame 23, and the sections above the intermediate sections are arched and gradually curve backward. The upper and lower pipe end openings of the front support pipes 24, 26 are connected in a piping manner, with their upper ends butting up to the pipe end openings of the upper beam pipes 28, 29 and their lower ends butting up to the pipe end openings of the base pipes 23c, 23d. As a result, inside the front support pipes 24, 26 and upper beam pipes 28, 29, vent pipes T1, T2 with lengths and cross sections corresponding to the piping shapes are formed, as shown in Figure 1.

[0018] Openings 33, 34 are provided at the lower ends of the left and right ventilation ducts T1, T2 by cutting out the lower plates of the corresponding base pipes 23c, 23d, and the left and right ventilation ducts T1, T2 are open to the outside through these openings 33, 34. One of the openings 33 is provided with a fan that creates an air flow in the ventilation duct T1, i.e., an exhaust fan 35 that exhausts inside air through the opening 33 of the left front support pipe 24. The other opening 34 is provided with a fan that creates an air flow in the ventilation duct T2, i.e., an intake fan 36 that draws outside air through the opening 34 of the right front support pipe 26.

[0019] As shown in Fig. 6, the fans 35, 36 are small, electrically driven blowers that rotate a plurality of blades 35a, 36a. Each fan 35, 36 is incorporated into the lower front end of the framework structure 15 and is located in a position away from the power unit (engine and hydraulic equipment) that is located near the rotation axis PV of the pile driver 11, where it is less affected by heat. The fans 35, 36 draw in outside air through one opening 34 and exhaust air from the operator's cab S through the other opening 33. That is, in the pile driver 11 of this embodiment, in which the cab 14 is mounted on the front right part of the upper rotating body 13, the intake fan 36 and the exhaust fan 35 are located in the right front support pipe 26, which is located farthest from the rotation axis PV, among the front, rear, left, and right support pipes 24, 25, 26, and 27, and the exhaust fan 35 is located in the left front support pipe 24, which is located second farthest.

[0020] The left and right upper beam pipes 28, 29 have a length approximately half that of the base frame 23, and on their inner surfaces are provided vents 37, 38 that connect the ventilation pipes T1, T2 to the operator's cab S. These vents 37, 38 are located near the head of the seated operator and are arranged facing each other, with ventilation registers 39, 40 attached to them, respectively.

[0021] 5, the registers 39, 40 are push-button ventilation registers that can open and close the vents 37, 38, have air purifying filters built in, and are closed when not in use. In addition, the push-button movable parts 39a, 40a of the registers 39, 40 are provided with switches (ON / OFF switches, not shown) that operate the fans 35, 36 on the corresponding left and right sides in conjunction with the opening movement.

[0022] With the cab 14 of the pile driver 11 configured in this manner, ventilation of the operator's cab S is performed in the following manner with the windows closed. First, when the push-button movable portion 40a of the right-side register 40 is operated to the open position, the intake fan 36 is activated, and the suction force creates a flow in the direction of arrow A in the ventilation duct T2, as shown in Figure 1. Outside air is taken in through the opening 34 of the right front support pipe 26, rises through the ventilation duct T2, and is carried rearward, and is then sent out to the operator's cab S through the vent 38 of the upper right beam pipe 29 as clean air that has passed through the register 40.

[0023] This generates a gentle air current from above to below in the cab S, as indicated by arrow B. The moist warm air stagnating in the lower space of the cab S is pushed by the outside air taken into the room and escapes through the ventilation holes 32 in the base frame 23, and is released to the outside as a flow indicated by arrow C. In this way, by leaving only the air intake register 40 open, the air inside and outside the cab S is gradually exchanged.

[0024] Next, when the push-button movable part 39a of the left-side register 39 is operated to the open position from the register 40 in the open position, the exhaust fan 35 is activated and the suction force creates a flow in the direction of arrow D in the ventilation duct T1. Here, the air taken in from the ventilation port 37 in the upper left beam pipe 28 is guided forward through the ventilation duct T1 and is ultimately released to the outside through the opening 33 in the front left support pipe 24. In this way, by opening both the intake register 40 and the exhaust register 39, the air inside and outside the cab S is quickly exchanged.

[0025] Thus, according to the cab 14 of the construction machine of the present invention, ventilation ducts T1, T2 are formed by connecting the support pipes 24, 26 and the beam pipes 28, 29 in a piping-like manner in the frame structure 15 that defines the operator's cab S, and fans 35, 36 for generating airflow are provided in the support pipes 24, 26, and vents 37, 38 that connect the ventilation ducts T1, T2 and the operator's cab S are provided in the beam pipes 28, 29, respectively, so that the airflow path necessary for ventilation inside the room can be secured without providing a dedicated duct. In other words, a cab 14 that can suppress temperature rise inside the room with a simple ventilation structure that uses existing hollow pipe material is achieved. Moreover, the vents 37, 38 located at the top of the cab S allow the airflow to reach the operator, giving him a refreshing feeling, and the support pipes 24, 26 having vertical ventilation ducts T1, T2 provide downward openings 33, 34, eliminating the need to take measures to prevent the intrusion of rainwater, noise, etc., making this an inexpensive and highly practical product.

[0026] In addition, the registers 39, 40 attached to the ventilation openings 37, 38 are equipped with switches that operate the fans 35, 36 in conjunction with their opening operation, so ventilation operation can be started immediately by the simple operation of just opening the registers 39, 40, and when ventilation is not required, such as when leaving the room, the registers can be closed to stop the fans 35, 36, allowing for appropriate ventilation according to the conditions in the room.

[0027] Furthermore, if the fan for generating the airflow is the intake fan 36, by installing it on the support pipe 26 located farthest from the rotation axis PV of the upper rotating body 13 among the front, rear, left, and right support pipes 24, 25, 26, and 27, it is possible to eliminate the problem of unnecessary intake of heat generated by the power unit. In other words, it becomes possible to take in cool outside air that is suitable for ventilation, making the air supplied to the room more comfortable.

[0028] In addition, if the fans for generating airflow consist of the intake fan 36 and the exhaust fan 35, it is possible to promote air circulation within the cabin and actively ventilate the cabin. In particular, by separately installing the exhaust fan 35 and the intake fan 36 on the left support pipe 24 and the right support pipe 26, respectively, a wide gap equivalent to the width of the cab is secured, preventing a short-circuit phenomenon in which air released from one opening 33 is directly sucked into the other opening 34. In this case, by installing the intake fan 36 on the support pipe 26 located farthest from the pivot axis PV and the exhaust fan 35 on the support pipe 24 located second farthest, the ventilation structure can be optimized and an air environment with little energy loss can be achieved.

[0029] Although the present invention has been described with reference to a pile driver as an example of construction machinery, it is not limited to this and can be applied to the cabs of various construction machinery equipped with excavation equipment or loading and unloading equipment, such as earth drills and cranes. In this case, the ventilation passage using the hollow pipe material of the framework structure can save space inside the cab, which increases the overall design freedom, including for mounted parts and hydraulic and electrical circuits, and makes it possible to smoothly proceed with model changes and new model development. [Explanation of symbols]

[0030] 11...pile driver, 12...lower running body, 13...upper rotating body, 14...cab, 15...frame structure, 16...leader, 17...swivel frame body, 17a...floor frame, 18...front window, 19...door, 20...roof panel, 21...side panel, 22...house, 23...base frame body, 23a, 23b, 23c, 23d...base pipe, 24...left front support pipe, 25...left rear support pipe, 26...right front support pipe, 27...right rear support pipe, 28...left upper beam pipe, 29...right upper beam pipe, 30...angle support, 31...cross beam pipe, 32...ventilation hole, 33, 34...opening, 35, 36...fan, 35a, 36a...blade, 37, 38...vent, 39, 40...register, 39a, 40a...push movable part

Claims

1. A cab mounted on an upper rotating body of a construction machine and having a framework structure defining an operator's cab therein, The framework structure has support pipes erected at the four corners of the front, rear, left, and right of the cab, and beam pipes suspended between the upper ends of the front and rear support pipes, and an air duct is formed inside the support pipes that are connected to at least one of the support pipes and the beam pipe in a piping manner, The support pipe is provided with a fan that creates an air flow in the ventilation pipe, The beam pipe is provided with a vent hole that communicates the vent pipe line with the operator's cab, an openable and closable register is attached to the vent; The register is provided with a switch that operates the fan in conjunction with the opening operation of the cab.

2. 2. The cab according to claim 1, wherein the fan is an intake fan that draws in outside air through an opening at the lower end of the support pipe, and the intake fan is provided on the support pipe located farthest from the rotation axis of the upper rotating body among the front, rear, left, and right support pipes.

3. 2. The cab according to claim 1, wherein the fans comprise an intake fan provided on one of the left and right support pipes to draw in outside air through an opening at the lower end of the support pipe, and an exhaust fan provided on the other support pipe to exhaust inside air through an opening at the lower end of the support pipe.

4. 4. The cab according to claim 3, wherein the intake fan is provided in the support pipe located farthest from the rotation axis of the upper rotating body among the front, rear, left, and right support pipes, and the exhaust fan is provided in the support pipe located second farthest from the rotation axis of the upper rotating body.

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