JPS61130508A - Airplane snow removing vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an aircraft snowplow used for snow removal and waterproofing of the fuselage and wings of an aircraft.

[Technical background of the invention and its problems]

Since January 1980, when an airplane crashed during snowfall at an airport in Washington, D.C., the importance of snow removal and waterproofing for airplanes has been reconsidered in Japan as well.

Conventionally, for snow removal and waterproofing work on aircraft, an aircraft snowplow as shown in Fig. 1 is equipped with a fresh water tank, an anti-icing liquid tank, a water discharge device, a fresh water heating device, and an elevated work platform device on a self-propelled chassis. is used. The piping system is shown in Figure 2.

To remove snow and waterproof the fuselage and wings of an aircraft, an elevated platform is elevated, and while the vehicle is running at very low speed, a mixture of fresh water and anti-icing liquid is applied to the aircraft's wings from a nozzle on the elevated platform. and by spraying it on the aircraft. In this case, mutual communication between the worker on the workbench and the vehicle driver's seat is provided by I/7, 7).

Aircraft snow removal.

Waterproofing work begins by removing snow with a large flow mixture, and then waterproofing with a small flow mixture containing a high proportion of anti-icing fluid.

In addition, the mixing ratio of the fresh water and anti-icing liquid in the liquid mixture needs to be changed depending on the temperature, such as increasing the ratio of anti-icing liquid to fresh water when the temperature is low. Conventionally, a non-positive displacement centrifugal pump has been used to pump the fresh water layer, and a positive displacement gear pump has been used to pump the anti-icing liquid, both of which are driven at a constant rotation speed via a variable speed mechanism by an auxiliary engine. was. Change the mixing ratio and flow rate by checking the flowmeter pointer of each line.
The flow rate control valve provided in each pump discharge circuit is operated by IiFM to adjust its opening degree.

In this case, the fresh water pump is a centrifugal pump.

By adjusting the opening degree of the flow rate control valve, the discharge amount of the pump can be changed and the UR section of the flow rate can be performed.
When the pressure downstream of the quantity control valve changes.

The flow rate changes and needs to be readjusted.

It has the disadvantage of being troublesome, and since the anti-icing liquid pump is a positive displacement gear pump and is driven at a constant rotation, the anti-icing liquid pump always discharges a constant amount of anti-icing liquid. When the flow rate of anti-icing liquid is changed by adjusting the opening degree of the flow control valve of the ice liquid circuit, excess anti-icing liquid is returned to the anti-icing liquid tank from the relief valve installed in the discharge circuit of the anti-icing liquid pump. I will do it. However, anti-icing liquid for aircraft is a high viscosity polymer solution liquid, and when stirred by a relief valve etc., the polymer particles are destroyed and reduced, the liquid quality is impaired and the viscosity drops.
It had the disadvantage that the adhesion force decreased when the liquid was discharged onto an Ilc aircraft.

[Purpose of the invention]

The present invention allows accurate follow-up control or remote control of the flow rate without impairing the quality and viscosity of the anti-icing liquid.
The purpose is to provide an efficient, stable, and safe aircraft snowplow.

[Summary of the invention]

The present invention includes a fresh water tank, an anti-icing liquid tank, a fresh water high pressure pump, and an anti-icing liquid pump on a self-propelled chassis.

In an aircraft snowplow equipped with a mixed liquid discharge device of anti-icing liquid and fresh water, and an elevated work platform device, the high-pressure fresh water pump and the anti-icing liquid pump are positive displacement pumps.

Moreover, the aircraft snowplow is driven by a variable speed mechanism, and the flow rates of fresh water and anti-icing liquid are controlled by follow-up or remotely.

[Embodiments of the invention]

The present invention will be explained in more detail based on embodiments shown in the drawings.

Example 1 FIG. 1 is a side view showing an example of an aircraft snowplow.

FIG. 3 is a hydraulic piping system diagram showing an example of the drive hydraulic circuit of the aircraft snowplow according to the present invention.

FIG. 4 is a system diagram showing an example of the piping system of the aircraft snowplow of the present invention.

FIG. 5 is a sectional view showing an example of an eccentric-shaft scraper pong. In FIG. 4 is Yu Shimizu/
5 is an anti-icing liquid tank.

Reference numeral 6 denotes a storage room for snow removal equipment, and inside thereof there are a drive auxiliary dish, a heater for heating water, a heater, a water supply port, and a high-pressure fresh water pump. Fresh water flow meter 11. Anti-icing liquid pump 12. An anti-icing liquid flow meter 131 and the like are provided.

Reference numeral 14 denotes an elevated work platform device, and the elevated work platform 15 has a structure that allows it to be raised and lowered and expanded and contracted m times. Reference numeral 16 denotes a liquid discharge nozzle provided on the elevated workbench. In other words, fresh water is in fresh water tank 4.
1 Heater water supply pump 91 Fresh water heating heater 8. Fresh water high pressure pump 10. and through the fresh water flowmeter 11 to the mixing point 17
The anti-icing liquid is sent from the anti-icing liquid tank 5 to the anti-icing liquid pump 12. is sent to a mixing point 17 through an anti-icing liquid flow meter 13;
Fresh water and anti-icing liquid Fi are mixed at a mixing point 17, and 1 g of the mixture passes through a pipe 18 and is discharged from a liquid discharge nozzle 16 provided on an elevated working platform 15 toward the aircraft.

# To perform snow and ice protection on aircraft, the outside temperature must be maintained at the same temperature as mentioned above.

It is necessary to change the mixing ratio and flow rate of fresh water and anti-icing liquid due to snow removal and waterproofing work. A screw pump is used.The high-pressure fresh water pump 10 and anti-icing liquid pump 12 are both driven by an auxiliary drive engine 7 via a hydraulic variable speed mechanism.

That is, the +a-dynamic auxiliary engine 7 drives two hydraulic pumps.

Hydraulic pump 19 Fi for fresh water, Hydraulic pump 20 if
It is for anti-icing liquid. 2) is a hydraulic motor that drives the high-pressure fresh water pump 10, and 22 is a hydraulic motor that drives the anti-icing liquid pump. Fresh water high pressure pump 1O and anti-icing liquid pump 1
2 are each driven by a drive auxiliary countersunk/7 via a hydraulic motor and a hydraulic pump. 23 and 24 were provided in the fresh water hydraulic circuit and the anti-icing liquid hydraulic circuit, respectively.

This is a hydraulic flow rate control valve, which controls the rotation speed of the hydraulic motors 2) and 22 by controlling the hydraulic flow rate.

Since both the high-pressure fresh water pump 10 and the anti-icing liquid pump 12 are positive displacement eccentric uniaxial screw pumps, the discharge amount of the high-pressure fresh water pump 10 and the anti-icing liquid tank 12 is proportional to the rotation speed, The flow rate of the liquid is determined by each flowmeter 11.1.
While looking at the pointer 3, adjust the flow rate control valve 23 of each hydraulic pressure.
．． 24 and change the rotation speeds of the fresh water high pressure pump 10 and the anti-icing liquid pump 12, it is possible to change the rotation speed independently. That is, since the flow rate of the anti-icing liquid is changed by changing the discharge amount of the anti-icing liquid pump 12 itself, the quality of the anti-icing liquid that is generated when it flows back from the relief valve 25 to the anti-icing liquid tank 5 is changed. Along with being able to prevent deterioration.

Since the fresh water high-pressure pump 10 and the anti-icing liquid pump 12 are positive displacement eccentric-shaft screw pumps, the discharge amount is not affected by pressure, and the mixing ratio and flow rate of fresh water and anti-icing liquid can be easily adjusted. Therefore, the mixing ratio and flow rate of fresh water and anti-icing liquid can be easily adjusted without impairing the quality of the anti-icing liquid. Although various types of pumps such as gear pumps, vane pumps, granger pumps, etc. can be considered as the pump, in this embodiment, an eccentric-shaft screw pump as shown in FIG. 5 was used.

The eccentric single-screw pump pumps liquid by rotating a male-threaded rotor 36 through an eccentric shaft within a stator n made of an elastic material and having an oval cross section.

The anti-icing liquid has the characteristic of being continuously pumped without pulsation or stirring, and has the effect of not impairing the liquid quality compared to other positive displacement pumps.

Embodiment 2 In Embodiment 1, each flow rate was manually adjusted each time while checking the flow meter of each line, but in this embodiment, a pulse transmitter is provided on the flow meter, and l! ! By feeding back the current or voltage value according to the amount, each flow rate is controlled by additional value, and the adjustment of the mixing ratio is automated.

FIG. 6 is a control system diagram thereof.

The dial 26 is a mixing ratio setting operation device for setting the mixing ratio of fresh water and anti-icing liquid. γ is a mixed liquid flow rate setting operator that sets and adjusts the mixed liquid flow rate. Reference numerals 28 and 29 are ratio setting devices that output the current or voltage output from the mixed liquid flow rate setting device 27 in proportion to the output from the mixing ratio setting device 26. 28 is a ratio setting device for fresh water, and 4 is a ratio setting device for anti-icing liquid. , 30 is a flow meter with a transmitter for fresh water, which outputs a current or voltage depending on the flow rate of fresh water in one pass. 31 is a flow rate controller for fresh water, which compares the output fed back from the flow meter for fresh water (9) and the output from the ratio setter for fresh water 28.

Outputs the difference. 32 is a fresh water flow rate controller 31
From K, the hydraulic motor 2) opens and closes according to the voltage or current output from the hydraulic motor 2), adjusts the flow rate of the hydraulic circuit, and adjusts the rotation speed of the hydraulic motor 2) that drives the fresh water high-pressure pump 1o.

Electromagnetic proportional hydraulic flow rate for fresh water that adjusts the flow rate of fresh water 1! '
I + goben. Also, 33 is a flow meter with a transmitter for anti-icing liquid.

Outputs current or voltage according to the flow rate of anti-icing liquid passing through.

34 is a flow rate controller for anti-icing liquid, and the anti-icing liquid flow meter 33
Compare the output fed back from the anti-icing liquid ratio setter 4 and output the difference, 35
The anti-icing liquid flow controller opens and closes according to the voltage or current output of the arm to adjust the flow rate of the hydraulic circuit, and the anti-icing liquid pump 12
This is an electromagnetic proportional hydraulic flow control valve for anti-icing liquid that adjusts the flow rate of anti-icing liquid by adjusting the rotation speed of a hydraulic motor 22 that drives the anti-icing liquid.

In this example, the flow rate of fresh water and anti-icing liquid is always controlled by additional value, so that the mixed liquid can be accurately sprayed into the nozzle without impairing the quality of the anti-icing liquid at a constant constant mixing ratio. liquid is released towards the aircraft to remove snow.

It has the effect of being able to perform waterproofing work.

In this example, a flowmeter with a single transmitter was used as a method of feeding back the flow rate of fresh water and anti-icing liquid. However, since an eccentric single-screw pump has a constant flow property, an eccentric-axial screw pump with a rotating A meter is installed to convert the flow rate of fresh water and anti-icing liquid into rotational speed.

The current or voltage output from the tachometer may be fed back, which has the effect of reducing costs.

Example 3 In the conventional aircraft snowplow, as mentioned above, the flow rates of fresh water and anti-icing liquid are fil! Since each flow rate control valve was operated directly during the initial operation, fresh water piping and anti-icing liquid piping had to be installed independently on one workbench.

Not only does the high-altitude work platform become heavy, but it also has the disadvantage that it cannot be controlled in other places, such as in the driver's seat.

In this embodiment, the flow rates of fresh water and anti-icing liquid are controlled remotely. FIG. 7 is a diagram of the piping system.

In the figure, 32 is an electromagnetic proportional hydraulic flow control valve for fresh water,
Depending on the current or voltage output of the Shimizu remote controller.

The flow rate of fresh water is controlled by adjusting its opening degree and the rotation speed of the fPI water high pressure pump 0. The story is an electromagnetic proportional hydraulic flow control valve for anti-icing liquid, and its opening degree is adjusted by the current or voltage output of an anti-icing liquid flow remote controller 39, and the rotation speed of an anti-icing liquid pump bulb is adjusted. K, control the flow rate of the anti-icing liquid. 40 is a fresh water flow rate indicator, and 41 is an anti-icing liquid flow rate indicator, which is based on the current or voltage output of the flow meter with transmitter for fresh water and the flow meter with transmitter for anti-icing liquid 33, respectively.

Remotely indicates each flow rate. By making the aircraft snowplow of the above structure, there is no need to install two pipes, a fresh water pipe and an anti-icing liquid pipe, on one workbench, and the fresh water and anti-icing liquid can be mixed in the snow removal equipment storage room 6. , it is only necessary to install one pipe for the mixed liquid, the weight of the aerial work platform device G114 is reduced, and the stability of the aircraft snowplow is increased when the aerial work platform device 114 is raised and the vehicle travels. Able to safely remove snow and perform waterproofing work.

In this case, between the fresh water remote controller and the anti-icing liquid flow remote controller 3.
9. Fresh water flow rate indicator 40. The anti-icing liquid flow rate indicator 41 is placed on the elevated work platform 15, and the worker on the elevated work platform 15 discharges the mixed liquid from the liquid discharge nozzle 16 to the aircraft while adjusting each flow rate and mixing ratio. Each remote control device A, 39 and each flow rate indicator 40, 41 are placed in the driver's seat 42 of the self-propelled chassis 1, and the driver adjusts each flow rate and mixing ratio, and the interface If the worker on the elevated work bench 15 concentrates on discharging liquid from the nozzle while communicating with the worker on the elevated work bench 15, the snow removal and waterproofing work can be carried out efficiently. Further, in this embodiment, the hydraulic flow control valve is operated by a remote controller, but the hydraulic flow control valve is manually operated.

A hydraulic flow control valve may be disposed on the elevated workbench or in the operator's seat 42 and operated directly to remotely control the flow rates of fresh water and anti-icing liquid, which has the effect of reducing costs.

〔Effect of the invention〕

By adopting the fresh water high-pressure pump, waterproof discharge pump, and all of their drive mechanisms as described above, the quality of the anti-icing liquid is not impaired.
The present invention has the effect that it is possible to perform waterproofing and snow removal work on aircraft, and to perform accurate, efficient, and safe snow removal and waterproofing work on aircraft through follow-up control of flow rate or remote control.

[Brief explanation of drawings]

Fig. 1 is a side view showing an example of an aircraft snowplow. Fig. 2 is a piping system diagram showing the piping system of a conventional aircraft snowplow. Fig. 3 is a hydraulic piping system diagram showing an example of the drive hydraulic circuit. FIG. 5 is a piping system diagram showing an example of the piping system of the aircraft snowplow of the invention. FIG. 5 is a sectional view showing an example of an eccentric single-screw pump. FIG. 6 is a control system diagram when the operation of the aircraft snowplow of the invention is automatically controlled. FIG. 7 shows the muzzle of the piping control system when the operation of the aircraft snowplow of the present invention is remotely controlled. 1...Self-propelled chassis, 2...Subframe 3-
- Vehicle chassis frame 4... Fresh water tack 5... Anti-icing liquid tank 6... Snow protection device storage room. 7--Drive auxiliary engine, 8... Fresh water heating heater, 9... Heater water supply pump 10... Fresh water high pressure pump 11... Fresh water flow meter. 12... Anti-icing liquid pump 13... Anti-icing liquid flow meter
14... High place work bench device l5... High place work bench,
16-・Liquid discharge nozzle, 17...Mixing point, 1B・
··Piping. 19...Hydraulic pump for fresh water, 20...Hydraulic pump for anti-icing liquid 2)...Hydraulic motor for fresh water, 22-
・Hydraulic motor for anti-icing liquid, 23-Hydraulic flow control valve for fresh water
24... Hydraulic flow control valve for anti-icing liquid, 25...
Relief valve, 26...Mixing ratio setting operator, 27...
Mixed liquid flow rate setting device, 28-- Ratio setting device for fresh water, 29-- Ratio setting device for anti-icing liquid, 30-- Flowmeter with transmitter for fresh water. 31...Flow rate controller for fresh water, 32-Electromagnetic proportional hydraulic flow control valve for fresh water. H...Flow meter with transmitter for anti-icing liquid 34--Flow rate regulator for anti-icing liquid, 35-Electromagnetic proportional hydraulic flow control valve for anti-icing liquid, 36--Rotor, 37--Stator. Feather... Fresh water remote controller, 39... Anti-icing liquid flow rate remote controller, 40... Fresh water flow rate indicator, 41...
Anti-icing liquid flow rate indicator, 42-・Driver seat No. I of self-propelled vehicle chassis
zo 3) Evil 51 [:] + 2 & Toki 6 〕 Thought 7 people wa ] Figure

Claims (1)

[Claims] (1) A fresh water tank and an anti-icing liquid tank on a self-propelled chassis,
In an aircraft snowplow equipped with a high-pressure fresh water pump, an anti-icing liquid pump, a mixed liquid discharge device of anti-icing liquid and fresh water, and an elevated work platform device, the high-pressure fresh water pump and the anti-icing liquid pump are positive displacement type. An aircraft snowplow characterized by being a pump and being driven by a variable speed mechanism. (2) In an aircraft snowplow equipped with a self-propelled chassis equipped with a fresh water tank, an anti-icing liquid tank, a fresh water high-pressure pump, an anti-icing liquid pump, and an elevated work platform device, the fresh water high-pressure pump and the anti-icing liquid An aircraft snowplow characterized in that the pump is a positive displacement pump, driven by a variable speed mechanism, and furthermore, the flow rate of fresh water and the flow rate of anti-icing liquid are controlled by additional value. 3) In an aircraft snowplow equipped with a self-propelled chassis equipped with a fresh water tank, an anti-icing liquid tank, a fresh water high-pressure pump, an anti-icing liquid pump, and an elevated work platform device, the fresh water high-pressure pump and the anti-icing liquid pump are An aircraft snowplow is characterized in that the pump is a positive displacement pump, is driven by a variable speed mechanism, and furthermore, the flow rate of fresh water and the flow rate of anti-icing liquid are remotely controlled. (4) The aircraft snowplow according to claim 1, wherein the positive displacement pump is an eccentric uniaxial screw pump.