JP2014065427A - Dump car for air port - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dump car for an air port capable of promptly closing a hood without using a special tool even when a hydraulic cylinder for opening and closing the hood malfunctions.SOLUTION: A dump car for an air port collects waste substances from aircrafts at an apron of an air port and includes: a vehicle frame 3; a load carrying platform 2 mounted on the vehicle frame 3; a hood 6 which is rotatably attached to an upper part of the load carrying platform 2; a hydraulic cylinder 18 for opening and closing the hood 6; a manual operation valve 34 which releases a holding pressure of the hydraulic cylinder 18; and an operation lever 16 which forms a link mechanism with the hydraulic cylinder 18, biases the hydraulic cylinder 18 in a contraction direction, and closes the hood 6.

Description

  The present invention relates to an airport dump vehicle used for collecting waste from an aircraft in an airport apron.

  Dump vehicles can be easily discharged by raising a loading platform mounted on a vehicle frame, and are therefore used at various sites handling various transported items. Some dump vehicles of this type have a lid (referred to as a “canopy”) on the top of the loading platform in order to suppress the scattering of the load, and this canopy is opened and closed with a hydraulic cylinder (Patent Document 1, etc.). reference).

JP 2003-146079 A

  At the airfield apron, it is necessary to remove the arriving aircraft and quickly collect the garbage. When dumping vehicles are used for collecting trash and removing aircraft, it is not allowed for safety to drop the load on the apron connected to the runway, so the platform is equipped with a canopy to prevent the load from falling There must be. However, when the apparatus of Patent Document 1 is applied, there are the following concerns.

  First, since the canopy is configured to be opened and closed with a hydraulic cylinder, the opening and closing of the canopy is hindered if the hydraulic cylinder or its circuit breaks down. In particular, it must be avoided that the canopy cannot be closed with the apron loaded with trash. However, since the canopy is at the top of the loading platform, it is difficult for the operator to close it manually. However, if the holding pressure of the hydraulic cylinder is released, it can be closed by its own weight. However, depending on the dead weight, it takes time to close the canopy, and if the collection work is delayed, the movement of the aircraft will be hindered, which will affect the schedule of many passengers and airport personnel. Severe damage can occur. Moreover, in the apron adjacent to the vast runway, strong winds are not uncommon, and it is naturally assumed that even if the holding pressure of the hydraulic cylinder is released, the canopy is blown by the wind and cannot be closed by its own weight. In addition, it is not desirable to repair the hydraulic cylinder with an apron because misplacement of tools or the like can lead to an accident.

  The present invention has been made in view of the above circumstances, and provides an airport dump vehicle that can quickly close a canopy without using a special tool even when a hydraulic cylinder that opens and closes the canopy malfunctions. With the goal.

  In order to achieve the above object, a first invention is an airport dump vehicle that collects waste from an aircraft in an airport apron, and includes a vehicle frame, a loading platform mounted on the vehicle frame, and an upper portion of the loading platform. A link mechanism is formed with the hydraulic cylinder, a hydraulic cylinder that opens and closes the canopy, a manual operation valve that releases the holding pressure of the hydraulic cylinder, and the hydraulic cylinder. And an operating lever for closing the canopy.

  In a second aspect based on the first aspect, the operating lever includes a lever main body rotatably connected to the wall surface of the cargo bed, and a lever grip held so as to be movable forward and backward with respect to the lever main body. When the lever grip is pulled out with respect to the lever main body with the canopy opened, the lever grip protrudes to the side of the cargo bed.

  According to a third aspect, in the second aspect, the lever grip has a posture that extends vertically with the canopy closed.

  According to a fourth invention, in the third invention, the lever grip is provided with a retainer for the lever main body.

  According to a fifth invention, in any one of the first to fourth inventions, the operation lever and the manual operation valve are provided in a space between the cargo bed and the driver's seat.

  According to the present invention, the canopy can be closed by releasing the holding pressure of the hydraulic cylinder with the manual operation valve and moving the hydraulic cylinder with the operation lever. Thereby, even when the hydraulic cylinder that opens and closes the canopy malfunctions, the canopy can be quickly closed without using a special tool.

It is a side view showing the whole dump truck composition concerning a 1st embodiment of the present invention. It is an arrow front view of the loading platform by the II-II line in FIG. It is an arrow top view of the canopy opening / closing apparatus by the III arrow in FIG. It is an arrow side view of the canopy opening / closing apparatus by the IV arrow in FIG. 1 is a hydraulic circuit diagram of a cylinder unit provided in a dump vehicle according to a first embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings.

1. Dump Vehicle FIG. 1 is a side view showing the overall configuration of the dump vehicle according to the first embodiment of the present invention. In the present embodiment, the left and right in FIG.

  The dump vehicle shown in FIG. 1 is an airport dump vehicle that collects waste from an aircraft in an airport apron, and includes a vehicle 1 and a loading platform 2. The vehicle 1 includes a vehicle frame (chassis) 3 that is a main body and a driver's seat 4 mounted on the front portion of the vehicle frame 3. The loading platform 2 is mounted on the vehicle frame 3 so as to be positioned behind the driver's seat 4.

  The loading platform 2 of the present embodiment is configured in a box shape with an open top, and includes a bottom wall forming a floor, and front, rear, left and right side walls. However, since the dump vehicle viewed from the left side is schematically shown in the figure, the loading platform 2 shows only the left side wall 2b. The front and left and right side walls of the loading platform 2 are fixed structures, and the rear side walls are open / close doors or the like so that they can be opened and closed. A locking device is provided on the rear side wall so as not to open carelessly. In addition, the loading platform 2 is provided with a seal at the opening and closing portion, and is configured to ensure a certain airtightness in a state where a canopy 6 (see FIG. 2 and the like) described later is closed. And the lower part of the rear part of the loading platform 2 is connected to the vehicle frame 3 by a rotating shaft 5 extending left and right. When the hydraulic cylinder 8 is extended with the rear side wall opened, the rotating shaft 5 is used as a fulcrum. The loading platform 2 stands up (see the two-dot chain line), and the load is dumped and discharged.

2. Canopy FIG. 2 is a front view of the loading platform 2 taken along the line II-II in FIG.

  As shown in the figure, the upper opening of the loading platform 2 can be opened and closed by the canopy 6. In the present embodiment, two left and right canopies 6 are provided, and each canopy 6 is made of a steel plate having a sufficient weight per unit area. Constructing the canopy 6 with a steel plate is easy to ensure the airtightness of the loading platform 2 and is advantageous in securing the weight of the load acting in the closing direction. The left and right canopies 6 are rotatably connected to the upper end portions of the left and right side walls 2b via the rotation shaft 7 at the outer end portions in the vehicle width direction. The rotating shaft 7 is fixed to the canopy 6 and extends in the front-rear direction. That is, for example, the right side (left side in the figure) canopy 6 has a right end connected to the side wall 2b, and as shown in the drawing, the left side is rotated up and down to open and close the upper opening of the loading platform 2. It is. The left and right canopies 6 have a bilaterally symmetric configuration, and the opposite end portions are in close contact with each other in the closed posture. Although not particularly illustrated, a lock device may be provided on the canopy 6 so as not to open carelessly. Further, left and right canopy opening / closing devices 10 for opening and closing the left and right canopies 6 are provided on the side wall 2a on the front side of the loading platform 2, and these canopy opening / closing devices 10 are accommodated in a space between the loading platform 2 and the driver's seat 4. ing.

3. 3 is a plan view of the canopy opening / closing device 10 taken along the arrow III in FIG. 2, and FIG. 4 is a side view of the canopy opening / closing device 10 taken along the arrow IV in FIG. In addition, what was already demonstrated is attached | subjected with the same code | symbol as previous drawing in FIG.3 and FIG.4, and description is abbreviate | omitted. In these drawings, the loading platform 2 represents only the vicinity of the front end, and some elements such as a cylinder unit 11 and a link 12 described later are not shown. 3 and 4 show the left canopy opening / closing device 10, the left and right canopy opening / closing devices 10 are substantially symmetrical, and the right canopy opening / closing device 10 will be described below. The configuration is the same as that of the left canopy opening / closing device 10.

  As shown in FIGS. 1 to 3, the canopy opening / closing device 10 includes a cylinder unit 11, a link 12, a bracket 13-15, an operation lever 16, and a spring 17. The cylinder unit 11 includes a hydraulic cylinder 18 and a hydraulic drive device 19.

  The hydraulic drive device 19 incorporates a hydraulic circuit for driving the hydraulic cylinder, and is attached to the outer periphery of the cylinder tube of the hydraulic cylinder 18 to form a unit with the hydraulic cylinder 18. The hydraulic cylinder 18 is a drive device that opens and closes the canopy 6. A bottom side end of the hydraulic cylinder 18 is rotatably connected to the bracket 13 via a pin 20. The bracket 13 is fixed to the side wall 2 a of the loading platform 2. The rod end of the hydraulic Linder 18 is connected to the rotating shaft 7 of the canopy 6 via the link 12 and the bracket 14. Both ends of the link 12 are rotatably connected to the hydraulic cylinder 18 and the bracket 14 via pins 21 and 22. The bracket 14 is fixed to the rotating shaft 7.

  The operation lever 16 includes a lever body 25 and a lever grip 26. A base end portion of the lever main body 25 is rotatably connected to the bracket 15 via a pin 27. The bracket 15 is fixed to the side wall 2 a of the loading platform 2. Further, the intermediate portion of the lever main body 25 is connected to the connecting portion of the hydraulic cylinder 18 and the link 12 via the pin 21 described above. The pins 20-22 and 27 extend in the front-rear direction in parallel, and allow a swinging motion along the side wall 2 a of the loading platform 2 of each element of the canopy opening / closing device 10. As can be seen from FIG. 2, the lever body 25 constitutes a link mechanism together with the hydraulic cylinder 18, the link 12 and the bracket 14. It should be noted that the hydraulic cylinder 18 that is a drive device of the link mechanism has a vertical or nearly vertical posture in order that the weight of the piston rod and other elements of the link mechanism and the weight of the canopy 6 can effectively act in the contraction direction. It is preferable to install in. In order to raise the hydraulic cylinder 18, the bracket 22 is positioned at an outer position in the vehicle width direction below the side wall 2 a of the loading platform 2, for example, the pin 22 when the bracket 14 is in a posture extending inward in the vehicle width direction. It arranges in the position below. In this case, it is desirable that the link 12 is also configured to extend in the vertical direction.

  The lever grip 26 is inserted into a cylindrical tip portion of the lever main body 25 and is held so as to be able to advance and retreat relative to the lever main body 25. In the present embodiment, the lever grip 26 is attached to the lever body 25 in a posture inclined downward toward the outside in the vehicle width direction. A thumbscrew 28 is attached to the tip of the lever main body 25, and the lever grip 26 is fixed to the lever main body 25 at an arbitrary position by tightening the thumbscrew 28. A stopper 29 is provided at the base end of the lever grip 26 so that the grip 26 does not fall out of the lever body 25 even if the thumbscrew 28 is loosened and the tip is directed downward. For convenience of explanation, the position of the lever grip 26 whose tip is close to the thumbscrew 28 is referred to as “housing position”, and the position of the lever grip 26 whose stopper 29 is close to the thumbscrew 28 is referred to as “working position”.

  The lever body 25 is set to a length that does not protrude from the loading platform 2 in the vehicle width direction regardless of the posture. On the other hand, when the lever grip 26 is pulled out to the working position when the canopy 6 is open, the tip end portion has a length that protrudes outward in the vehicle width direction from the loading platform 2 (see FIG. 2). However, when pushed into the storage position, the lever grip 26 does not protrude in the vehicle width direction from the loading platform 2 regardless of the posture. Further, when the canopy 6 is closed, the lever grip 26 extends up and down so that the lever grip 26 does not protrude from the loading platform 2 in the vehicle width direction regardless of the storage position or the work position. Yes.

  Note that the spring 17 (see FIG. 2) is for maintaining the position of the canopy 6, the base end is rotatably connected to the side wall 2 a, and the tip is connected to an intermediate portion of the link 12. Yes. The spring 17 applies a restoring force in the extending direction to the link 12 from the base end side. The link 12 swings in an arc with the opening and closing operation of the canopy 6, but exceeds the top dead center of the spring 17 during the opening and closing operation of the canopy 6. That is, the direction of action of the urging force acting on the canopy 6 via the link 12 is switched from the top dead center of the spring 17 to help maintain the posture of the canopy 6 in the open position and the canopy 6 in the closed position. ing.

4). Cylinder Unit FIG. 5 is a hydraulic circuit diagram of the cylinder unit 11.

  As shown in the figure, the hydraulic drive device 19 includes an electric motor 31, a hydraulic pump 32, a switching valve 33, and a manual operation valve 34 as main components.

  The hydraulic pump 32 has a both-tilt swash plate mechanism having a pair of input / output ports, and the direction of discharge and suction of hydraulic oil from the input / output ports can be switched. One discharge pipe 32 a of the hydraulic pump 32 is connected to the bottom side oil chamber 18 a of the hydraulic cylinder 18 via a pilot check valve 35 and a slow return check valve 36. The other discharge pipe 32 b is connected to the rod side oil chamber 18 b of the hydraulic cylinder 18 via a pilot check valve 37 and a slow return check valve 38.

  The pilot check valves 35 and 37 are pilot actuated check valves that are operated by the pilot pressure from the discharge pipes 32b and 32a, respectively. The slow return check valves 36 and 38 have a throttle and a check valve, and supply the working oil to the bottom side oil chamber 18a and the rod side oil chamber 18b via the check valve, while the bottom side oil chamber 18a and the rod. The flow rate of the return oil from the side oil chamber 18b is reduced through the restriction. The discharge pipes 32a and 32b of the hydraulic pump 32 have relief valves 39 and 40 at positions closer to the hydraulic pump 32 than the pilot check valves 35 and 37, and closer to the hydraulic cylinder 18 than the pilot check valves 35 and 37. Relief valves 41 and 42 are respectively connected to the positions.

  The switching valve 33 is a pilot-actuated switching valve that operates with a pilot pressure guided from the discharge pipes 32a and 32b, and connects and disconnects the discharge pipes 32a and 32b and the tank 43 depending on the position. When the switching valve 33 is at the position 33a, only the discharge pipe 32a of the discharge pipes 32a and 32b is connected to the tank 43. When the switching valve 33 is at the position 33b, only the discharge pipe 32b of the discharge pipes 32a and 32b is connected to the tank 43. At the position 33 c, both the discharge pipes 32 a and 32 b are disconnected from the tank 43.

  The manually operated valve 34 is a switching valve that switches the position manually by the grip 50 (see also FIG. 2). The manual operation valve 34 is connected to a position closer to the hydraulic cylinder 18 than the pilot check valves 35, 37 in the discharge pipes 32a, 32b. When the position 34a is reached, the discharge pipes 32a, 32b are disconnected from the tank 43, and the position 34b. In this case, both the discharge pipes 32 a and 32 b are connected to the tank 43.

5. Operation First, when the hydraulic cylinder 18 is moved hydraulically, the manual operation valve 34 is set to the position 34a. When the hydraulic pump 32 is stopped, pilot pressure does not act on the switching valve 33 and the pilot check valves 35 and 37. Therefore, the switching valve 33 is in the position 33c by the biasing force of the spring, and the pilot check valves 35 and 37 are also closed. It is in the state. In this state, the hydraulic cylinder 18 is restrained from extending by the holding pressure. In this state, even if an excessive external force is inadvertently applied to the hydraulic cylinder 18, the relief valve 41 or 42 is opened and the circuit is protected.

  On the other hand, when the electric motor 31 is rotated forward by an operating device (not shown), the hydraulic pump 32 is rotated forward and hydraulic oil is discharged to the discharge pipe 32a, and the pilot check valve 37 is opened by the pilot pressure from the discharge pipe 32a. At the same time, the switching valve 33 is switched to the position 33b. As a result, the hydraulic oil from the hydraulic pump 32 is supplied to the bottom side oil chamber 18a of the hydraulic cylinder 18, the hydraulic cylinder 18 extends, and the canopy 6 opens. The hydraulic oil pushed away from the rod side oil chamber 18 b of the hydraulic cylinder 18 returns to the hydraulic pump 32, and the surplus return oil generated by the pressure receiving area difference between the bottom side oil chamber 18 a and the rod side oil chamber 18 b passes through the switching valve 33. Into the tank 43. For example, when pressure oil continues to be supplied to the bottom-side oil chamber 18a while the canopy 6 is restrained by some obstruction and the pressure in the discharge pipe 32a rises excessively, the relief valve 39 is activated and the circuit is Protected.

  On the contrary, when the electric motor 31 is reversed, the hydraulic pump 32 is reversed and the hydraulic oil is discharged to the discharge pipe 32b. The pilot check valve 35 is opened by the pilot pressure from the discharge pipe 32b, and the switching valve 33 is moved to the position. Switch to 33a. As a result, the hydraulic oil from the hydraulic pump 32 is supplied to the rod side oil chamber 18b of the hydraulic cylinder 18 together with the hydraulic oil sucked from the tank 34 via the switching valve 33, the hydraulic cylinder 18 contracts, and the canopy 6 is closed. The hydraulic oil pushed away from the bottom side oil chamber 18 a of the hydraulic cylinder 18 returns to the hydraulic pump 32. Further, when the pressure in the discharge pipe 32b rises excessively, the relief valve 40 is activated to protect the circuit.

  In addition, for example, when a malfunction occurs in the hydraulic cylinder 18, the hydraulic pump 32, the electric motor 31, or other hydraulic equipment and the hydraulic cylinder 18 malfunctions, the grip 50 is operated to switch the manual operation valve 34 to the position 34b. As a result, both the bottom side oil chamber 32a and the rod side oil chamber 32b of the hydraulic cylinder 18 are connected to the tank 43, and the holding pressure of the hydraulic cylinder 18 is released.

  If the hydraulic cylinder 18 becomes defective when the canopy 6 is in the open position, the holding pressure of the hydraulic cylinder 18 is released by switching the manual operation valve 34 to the position 34b, and the lever grip 26 is pulled out to the working position. By pushing down manually, the hydraulic cylinder 18 can be easily contracted and the canopy 6 can be closed. When the canopy 6 is closed, the holding pressure can be applied to the hydraulic cylinder 18 by returning the manual operation valve 34 to the position 34a.

6). Effect According to the present embodiment, the hydraulic cylinder 18 can be easily contracted manually by releasing the holding pressure of the hydraulic cylinder 18 with the manual operation valve 34 and pushing down the operation lever 16. As a result, even if the canopy 6 cannot be closed due to malfunction of the hydraulic cylinder 18 in a state in which the airport apron has removed the aircraft from the aircraft apron and the cargo bed 2 is loaded, the canopy 6 can be quickly removed without using a special tool. Can be closed.

  Further, since the lever body 25 and the lever grip 26 are provided on the operation lever 16, the lever grip 26 can be pushed from the working position to the storage position, and the operation lever 16 is stored within the width of the loading platform 2 when not in use. Can be kept. When the operation lever 16 is used, the lever grip 26 protrudes from the loading platform 2 in the vehicle width direction when the operation lever 16 is pulled out to the work position. The purpose of the lever grip 26 pulled out is to close the canopy 6. If pushed down to achieve, the lever grip 26 assumes a downward posture. Therefore, the lever grip 26 after use automatically fits within the width of the loading platform 2 regardless of whether it is in the working position or the storage position, and there is an advantage that it is possible to suppress forgetting to store the lever grip 26. Moreover, since the stopper 29 is provided in the base end part of the lever grip 26, the fall of the lever grip 26 at the time of driving | running | working forgetting tightening the thumbscrew 28 can also be suppressed.

  Further, since the canopy opening / closing device 10 is accommodated in the space between the front side wall 2a of the loading platform 2 and the driver's seat 4, the manual operation valve 34 and the operation lever 16 are in the immediate vicinity of the driver's seat 4 and compete for a moment. Helps to respond quickly when working in the apron.

  In the present embodiment, the hydraulic cylinder 18 is mounted in a vertically extending posture, and the weight of the link mechanism including the link 26 that similarly extends vertically and the steel plate canopy 6 is efficient as a force for contracting the hydraulic cylinder 18. Act on. In this way, by making the weight of the canopy 6 and the like actively act as a force for contracting the hydraulic cylinder 18, the canopy 6 can be made smoother in synergy with the force applied by the operating lever 16 in accordance with the heel principle. And it can close quickly.

  Further, when the lever grip 26 is pulled out to the working position with the canopy 6 open, the lever grip 26 is inclined downward toward the outside in the vehicle width direction. Can be added and operability is good. In addition, since the weight of the canopy 6 and the like acts synergistically as described above and the canopy 6 can be closed with a small force, it is also advantageous that the position of the power point can be adjusted by a person by tilting the lever grip 26. is there.

2 Loading platform 2a, b Side wall of loading platform 3 Car frame 6 Canopy 16 Operation lever 18 Hydraulic cylinder 25 Lever body 26 Lever grip 29 Stopper
34 Manually operated valve

Claims (5)

An airport dump vehicle that collects waste from aircraft in an airport apron,
A car frame,
A cargo bed mounted on this car frame,
A canopy that is pivotally attached to the top of the bed;
A hydraulic cylinder that opens and closes the canopy;
A manually operated valve for releasing the holding pressure of the hydraulic cylinder;
An airport dump vehicle comprising a link mechanism together with the hydraulic cylinder, and an operation lever for urging the hydraulic cylinder in a contracting direction to close the canopy.   The airport dump vehicle according to claim 1, wherein the operation lever includes a lever main body rotatably connected to the wall surface of the cargo bed, and a lever grip held so as to be movable forward and backward with respect to the lever main body, When the lever grip is pulled out with respect to the lever main body with the canopy opened, the lever grip protrudes to the side of the cargo bed.   3. The airport dump vehicle according to claim 2, wherein the lever grip is configured to extend vertically with the canopy closed. 4.   4. The airport dump vehicle according to claim 3, wherein the lever grip is provided with a stopper for the lever main body.   The airport dump vehicle according to any one of claims 1 to 4, wherein the operation lever and the manual operation valve are provided in a space between the cargo bed and a driver's seat.

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