JPS6216084Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an outside air intake amount adjusting device for a pressure riser mechanism provided in the cab of a construction machinery vehicle.

[Technical background of the invention and its problems]

A pressure riser mechanism installed in the cab of a construction machinery vehicle, such as a wheel loader, uses temperature-controlled jet air to constantly maintain the air pressure inside the cab, in order to prevent dust and dirt from entering the cab through gaps in the cab. Generally, 1/3 of the air discharged into the cab is brought in from outside, and 2/3 is internally circulated air within the cab.

In this way, the pressure riser mechanism introduces outside air, so in hot work environments, the cooling function may deteriorate due to the intake of high-temperature outside air. Requests have been made.

[Purpose of invention]

The present invention prevents the temperature control function of the pressure riser mechanism from deteriorating by allowing an operator in the cab to adjust the amount of outside air taken into the pressure riser mechanism as necessary.

[Summary of the idea]

In the outside air intake amount adjusting device of the present invention, a frame member 5 is fixed to the inner peripheral edge of an outside air intake port 3 of a pressure riser mechanism that blows air at an appropriate temperature into a cab 2 of a construction machinery vehicle 1. An adjustment plate 7 is provided in the inner opening so that it can be opened and closed, and a spring 9 that biases the adjustment plate in the direction of closing the adjustment plate 7 and a wire 11 that pulls the adjustment plate 7 against the spring are connected to the adjustment plate 7. A lever 15 for opening and closing the adjusting plate 7 is provided in the cab 2, and the lever 15 selectively engages one of a, b, and c of the plurality of locking grooves 17. A seal member 1 is provided with a louver 4 in the outside air intake port 3 and maintains airtightness with the adjustment plate 7 around the entire periphery of the inner opening of the frame member 5.
0 is set.

Therefore, when the lever 15 is moved between a, b, and c of the locking groove 17 and the wire 11 is pulled against the spring 9, the adjustment plate 7 is moved in the opening direction and the pressure riser mechanism is moved. When the wire 11 is returned and the spring 9 moves in the direction of closing the adjusting plate 7, the amount of outside air taken into the pressure riser mechanism decreases.
For example, when the outside work environment is hot, adjust the adjustment plate in the closed direction to reduce the opening of the outside air intake port, reduce the amount of hot outside air taken in, and prevent insufficient cooling of the pressure riser mechanism. Also, in winter, make sure to prevent insufficient heating inside the cab.

[Example of idea]

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

As shown in FIG. 1, an outside air intake port 3 of a pressure riser mechanism for blowing air at an appropriate temperature into the cab 2 is provided on the lower side of the cab 2 of a wheel loader 1 as a construction machinery vehicle. This outside air intake port 3 has many louvers 4 as shown in FIG.
is provided.

Further, as shown in FIG. 2, a frame member 5 is fixed to the inner peripheral edge of the outside air intake port 3, and an adjustment plate is rotatably supported on the inner opening of the frame member 5 by an upper hinge 6. 7 is provided so that it can be opened and closed freely.

As shown in FIG. 3, the adjustment plate 7 is connected to a sealing member at the periphery of the frame member 5 by a spring 9 stretched between the lower part of the adjustment plate 7 and the protrusion 8 of the outside air intake port 3. The rubber flange 10 is biased in the closing direction. Further, one end of the wire 11 is connected to the pin 12 at the bottom of the adjustment plate 7, and the wire 11 is slidably inserted into a guide 14 fixed to the inner surface of the body 13.
This wire 11 is pulled upward along the inner surface of the wire 11.
The other end is connected to a lever 15 as an operating section shown in FIG. 4 installed at a position within the cab 2 that is easy for an operator to operate. This lever 15 is connected to the elongated hole 1
6 to selectively fit into concave grooves 17 as locking grooves at a plurality of positions, and can lock the return by the spring 9. a indicates introduction of outside air, b indicates introduction of outside air by half, and c indicates cutoff of introduction of outside air.

Then, when the operator inside the cab 2 pulls the wire 11 to the position a by operating the lever 15, the adjustment plate 7 opens against the spring 9, and a predetermined amount of external air is pumped into the pressure riser mechanism. When the wire 11 is returned to position b, the adjustment plate 7 is rotated in the closing direction by the spring 9, reducing the amount of external air supplied to the filter of the pressure riser mechanism. Furthermore, by completely loosening the wire 11 to position c, the adjustment plate 7 can be brought into close contact with the rubber flange 10, and the amount of external air taken in can be reduced to zero. At this time, the pressure riser mechanism only completely circulates the air within the cab 2.

When the outside working environment is hot, adjust the adjustment plate 7 in the direction of closing to reduce the opening of the outside air intake.
By reducing the amount of high-temperature outside air taken in, insufficient cooling of the cooler of the pressure riser mechanism is prevented, and in winter, insufficient heating of the heater in the cab 2 is prevented.

The adjustment plate 7 is slidably provided in the inner opening of the frame member 5 by a wire 11.
The opening may be opened and closed by sliding.

[Effect of idea]

According to the present invention, a frame member is fixed to the inner peripheral edge of the outside air intake port of the pressure riser mechanism, an adjustment plate is provided in the inner opening of the frame member so as to be openable and closable, and an operating part for opening and closing the adjustment plate is installed inside the cab. This allows the operator in the cab to adjust the amount of outside air taken into the pressure riser mechanism by opening and closing the adjustment plate as necessary. This prevents the cooler from cooling insufficiently, and by reducing the amount of cold outside air taken in, it can prevent the heater from heating insufficiently. Furthermore, since the frame member is provided at the outside air intake port and the adjustment plate is attached, this outside air intake amount adjustment device can be installed even in existing construction machinery vehicles. In addition, for example, 5
In workplaces with a lot of dust that exceeds the environmental standard of mg/cm ³ or more, adjust the adjustment plate in the direction of closing to reduce the amount of outside air intake to protect the operator and extend the life of the filter in the pressure riser mechanism. be able to. In some cases,
The sealing member provided around the entire periphery of the inner opening of the frame member facing the adjustment plate can maintain sufficient airtightness when the adjustment plate is closed, and the operator can be completely protected. In addition, a spring that biases the adjustment plate in the direction of closing it and a wire that pulls the adjustment plate against the spring are connected to the adjustment plate, and a lever is provided inside the cab to open and close the adjustment plate via this wire. Since this lever is selectively engaged with one of the plurality of locking grooves, the adjustment plate can resist the strong suction force of the pressure riser mechanism, and the wire can be used to remotely control the adjustment plate inside the cab. Furthermore, in construction machinery vehicles having a complicated structure, the method of opening and closing the adjustment plate using wires is easy to install and is an effective means. Furthermore, we installed many louvers in the outside air intake,
This louver prevents rainwater from entering.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a wheel loader as a construction machinery vehicle, FIG. 2 is a sectional view showing an embodiment of the outside air intake amount adjusting device of the present invention, and FIG. 3 is a perspective view thereof.
FIG. 4 is a plan view showing the wire operating lever. 1...Wheel loader as a construction machinery vehicle,
2... Cab, 3... Outside air intake, 4... Louver, 5... Frame member, 7... Adjustment plate, 9... Spring, 10... Rubber flange as a sealing member, 11... Wire, 15 ...Lever, 17...
Concave groove as a locking groove.

Claims (1)

[Scope of utility model registration request] A frame member is fixed to the inner periphery of the outside air intake of the pressure riser mechanism that blows air at an appropriate temperature into the cab of a construction machinery vehicle, and an adjustment plate is provided in the inner opening of the frame member so that it can be opened and closed. A spring that biases the plate in the direction of closing is connected to a wire that pulls the adjustment plate against the spring, and a lever is provided inside the cab to open and close the adjustment plate via this wire. A seal member is provided on the entire periphery of the inner opening of the frame member to selectively engage one of the locking grooves of the stage, a large number of louvers are provided at the outside air intake port, and a seal member is provided on the entire periphery of the inner opening of the frame member to maintain airtightness with the adjustment plate. An outside air intake amount adjusting device with a pressure riser mechanism, characterized by: