JP4518854B2 - Hydraulic oil tank - Google Patents

Description

  The present invention relates to a hydraulic oil tank that stores hydraulic oil for hydraulic equipment provided in a construction machine such as a hydraulic excavator.

  Conventionally, construction machines such as hydraulic excavators are configured so that various devices including a travel drive unit are hydraulically operated. Therefore, in order to store hydraulic oil used to operate these devices, a relatively large size is required. The hydraulic oil tank is mounted on the fuselage. This hydraulic oil tank is connected to oil supply piping and return oil piping to the hydraulic pump, and pressure oil is supplied from the hydraulic pump to the actuators arranged in various places via control valves to operate the actuator. The returned oil is returned to the hydraulic oil tank by a return pipe, and the hydraulic oil circulates to operate each actuator to perform work.

  In this hydraulic oil tank, a strainer is disposed at an oil outlet connected to the suction port of the hydraulic pump by a pipe so that foreign matter is not mixed into the oil supplied to the pump. The strainer is placed by fitting the lower end to a mounting portion formed along the oil outlet provided at the bottom of the tank, and the tank is placed at the top of the strainer for easy inspection and cleaning. A long rod extending to the opening is attached (for example, see FIG. 5 of Patent Document 1).

JP-A-5-187401

  In the hydraulic oil tank, for example, when used for a large hydraulic excavator, each part is disassembled and transported because it is necessary to be within the vehicle restriction range of the road when transported by land. For this reason, the hydraulic oil tank must also be removed from the swivel frame, and it is necessary to clean up the hydraulic oil in the tank. For this purpose, the hydraulic oil tank discharges the entire amount of hydraulic oil from the tank during transportation, is assembled after transportation, and is refilled with hydraulic oil. When processing such hydraulic oil, there is a problem that a lot of man-hours are required, the processing time is long, and much cost is required.

  For this reason, a system is adopted in which a shut valve (for example, a butterfly valve) is attached to the oil outlet of the tank, the oil outlet is closed by this shut valve, and the hydraulic oil is left in the tank to be removed and transported. It has been known. However, since the hydraulic oil becomes high temperature during operation, the built-in shut valve requires a rubber material having high temperature oil resistance as a sealing member, and an expensive valve must be used. is there.

  The present invention has been made to solve such a problem, and the oil outlet can be closed by reversing the strainer mounting portion disposed at the oil outlet using the strainer take-out rod. It is an object of the present invention to provide a hydraulic oil tank that is provided with a shielding member and enables separation and transportation without discharging the hydraulic oil.

In order to achieve the above object, a hydraulic oil tank according to the present invention comprises:
A cylindrical strainer is arranged at the oil outlet provided at the bottom of the tank body of the required volume, a rod is provided on the top surface of the strainer, and a shielding member for closing the oil outlet is attached to the other end of the rod, In the hydraulic oil tank configured to close the oil outlet with the shielding member when the rod is reversed ,
A support member is attached to the opening of the tank lid provided at a position directly above the oil outlet, and a cylindrical guide holder is provided on the lower surface of the support member. A holding cylinder is provided so as to be freely movable up and down, and a lower outer peripheral surface of the holding cylinder is fitted to the shielding member to hold the shielding member. When the rod is reversed, the lower outer peripheral surface of the holding cylinder is The strainer is fitted into the opening of the strainer to hold the strainer (first invention).

In the present invention, a receiving plate is provided on the lower surface of the mounting seat plate that is fixed to the lower end of the guide holding portion, and the holding cylinder is provided with an inward flange portion, and the inward flange portion is It is preferable to be received so as not to be detached at the end of the receiving plate (second invention). Further, the cap is attached to the upper surface of the support member, the rod as the other end of the rod within the cap protrudes is disposed to detect the existence of the rod to the peripheral surface of the cap sensor Is preferably provided ( third invention).

According to the present invention, the rod attached to the strainer that is normally used is utilized, and the shielding member that closes the oil outlet of the tank is provided at the opposite end thereof, so that the strainer is inverted before the tank is separated. Then, the end of the strainer, which is attached upward to the oil outlet with the shielding member attached to the opposite position of the rod as it is, is held by the holding cylinder provided on the lower surface of the support member attached to the inspection port of the tank lid body it is, Ru can close the oil outlet by the shielding member. At this time, even if the hydraulic oil fluctuates in the tank due to an external force, the shielding member firmly closes the oil outlet, so that the hydraulic oil does not leak out and is separated with the hydraulic oil accumulated in the tank. Can be transported. Therefore, it is possible to save the man-hours required for discharging the hydraulic oil during transportation and filling the hydraulic oil after assembling, and it is possible to significantly reduce the construction cost.

Further, according to the second invention, even when the holding cylinder swings downward, the inward flange portion of the holding cylinder is received by the end portion of the receiving plate of the guide holding part, so that it does not come off. According to the third aspect of the invention, the rod attached to the strainer is used to detect the presence or absence of the rod end by the sensor. When the strainer is disposed at the oil outlet of the tank, the rod end is Is detected and transmitted to the control system, and when the sensor does not detect the rod end, the control system recognizes that it is abnormal and prevents the engine from starting. Therefore, the engine cannot be started in a state where the oil outlet of the tank is closed with the shielding member, so that an effect that the operation of the engine due to an erroneous operation can be prevented is obtained.

  Next, specific embodiments of the hydraulic oil tank according to the present invention will be described with reference to the drawings.

  1 is a schematic vertical sectional view of a hydraulic oil tank according to the present embodiment, FIG. 2 is an enlarged sectional view showing a part of the main part omitted, and FIG. 3 is an enlarged detailed view (a) of a rod holding mechanism. A-A view (b) in the figure is shown respectively.

  The hydraulic oil tank 1 of this embodiment is mounted on, for example, a swivel frame of a hydraulic excavator (not shown), and is formed in a box shape of a shielding structure with required dimensions as shown in FIG. The hydraulic oil tank 1 is provided with an oil outlet 3 at a substantially central portion of the bottom 2a of the tank main body 2, and a supply pipe to a hydraulic pump (not shown) is connected to the oil outlet 3 so that an intermediate dimension is appropriately separated. A return oil inlet 4 is provided at a position, a bend pipe 5 is attached to the inside from the return oil inlet 4, and a return pipe for hydraulic oil is connected thereto. The inside of the tank body 2 is partitioned by two partition plates 6 and 6 at a required interval so that the oil flowing in from the return oil inlet 4 provided in one section does not flow directly to the oil outlet 3. In addition, the stored hydraulic fluid is prevented from shaking greatly. In addition, the partition plates 6 and 6 are provided with through holes 7 communicating with adjacent sections in an intermediate portion. In addition, a slit 8 is provided in the lower part of the partition wall 6 so that the drain can be easily discharged. In addition, although not shown in the drawings, installation leg pieces and required piping / equipment attachment portions are provided on the side wall portion, the bottom surface, and the top surface.

  The bottom end of the tank main body 2 at the bottom 2a of the tank main body 2 is fitted to the mounting nozzle 9 attached to the oil outlet 3 with the cylindrical strainer 10 being detachable. Has been. The strainer 10 has a length that can reach the opening 15 (corresponding to the inspection port of the present invention) provided in the tank lid 2b at the center of the other end (upper end when in use) so that the strainer 10 can be inspected and replaced. The rod 16 for use (hereinafter simply referred to as the rod 16) is connected. As shown in FIG. 2, the mounting side of the strainer 10 with respect to the oil outlet 3 is held by a retainer 11 made of a metal plate at an axial opening, and an O-ring 12 is disposed on the mounting nozzle 9. By sealing in the fitted state, short-circuit outflow from the tank to the oil outlet is prevented. Further, the mounting nozzle 9 is tapered so that the outer periphery of the distal end portion becomes slightly narrower toward the distal end, and the operation for fitting with the opening of the strainer 10 is facilitated. The strainer 10 has a well-known structure formed in a cylindrical shape by bending a filtration sheet in a zigzag shape.

  The opening 15 provided in the tank lid 2b is provided at a position directly above the oil outlet 3, and a shielding member 17 provided integrally with the rod 16 attached to the strainer 10 is provided in the opening 15. A support member 21 having a holding mechanism 20 for holding is provided, and the hydraulic oil does not leak to the outside. The shielding member 17 is formed in a cap shape, and is welded and fixed to the rod 16 at the center position of the top plate 17a. An O-ring 17c is fitted on the inner peripheral surface of the cylindrical portion 17b. The shielding member 17 is attached to a position held by a holding mechanism 20 attached to the opening 15 of the tank lid 2b in a state where the strainer 10 is mounted on the oil outlet 3.

  The support member 21 has a disk shape having a central portion opened by a watermark hole 21a, and is fastened by a bolt 19 to an annular mounting seat 18 provided on the lower surface of the opening 15 of the tank lid 2b on the lower surface. And an annular boss 21b fitted to the inner peripheral portion of the mounting seat 18 so as to be mounted concentrically with the opening 15. The axial center of the opening 15 is related to the mounting nozzle 9 of the strainer 10 of the oil outlet 3 provided in the bottom 2a so that the axial center substantially coincides. Further, a guide holding portion 21c made of a cylindrical body with a required length is attached to the center portion of the lower surface downward and coaxially. An annular groove 18a is formed on the upper surface of the mounting seat 18, and the mounting surface with the support member 18 is sealed by a seal ring 22 fitted in the annular groove 18a.

  On the outer side of the cylindrical guide holding portion 21c of the support member 21, a holding cylinder 25 is formed concentrically on the inside and outside of the intermediate portion and above the flange portions 25a and 25b. A coil spring 27 is interposed in a space between the inner periphery of the guide holding portion 21c and the outer periphery of the guide holding portion 21c so as to freely move up and down. The coil spring 27 is urged so that the upper end is in contact with the lower surface of the support member 21 and the lower end is in contact with the upper surface of the inward flange portion 25a of the holding cylinder 25 so that the holding cylinder 25 is always pushed down. The holding cylinder 25 thus configured has a receiving plate 24 that is bolted to the lower surface of the mounting seat plate 23 that is fixed so as to cross the inward flange portion 25a to the lower end of the guide holding portion 21c of the support member 21. It is received so as not to be detached at the end of the.

  Further, the holding cylinder 25 is formed with a holding part 26 for the shielding member 17 which is a concentric cylinder having a required length below the flange parts 25a and 25b. The holding portion 26 is formed in a tapered surface with a taper having an appropriate length from the front end side of the outer peripheral surface, and is easily fitted with the shielding member 17. The shielding member 17 is received on the lower surface. The outer diameter of the holding portion 26 is set to a size that matches the opening when the opening of the strainer 10 is fitted (described later).

  On the upper surface of the support member 21, a cap 28 is fastened to the support member 21 with a bolt 29 at its flange portion 28a. A sensor 30 (for example, a proximity switch) for detecting the presence or absence of the rod 16 is attached to an appropriate place on the peripheral surface portion of the cap 28, and the sensor 30 is electrically connected to a controller 31 provided in the airframe. When the sensor 30 detects that the rod 16 is positioned so as to protrude into the cap 28, a signal is transmitted to the controller 31 so that an engine mounted on the airframe (not shown) can be operated. Is not performed.

  The hydraulic oil tank 1 of the present embodiment configured as described above, for example, when the mounted hydraulic excavator is disassembled for transportation, when removing it from the airframe with the hydraulic oil in the tank body 2, The supporting member 21 of the holding mechanism 20 that closes the opening 15 of the tank lid 2b is brought into a free state by removing the bolt 19 fastened to the mounting seat 18 at the edge of the opening 15. Next, when the support member 21 is lifted, the holding cylinder 25 together with the support member 21 is lifted by engagement between the receiving plate 24 attached to the end of the guide holding portion 21c and the flange portion 25a. At this time, it can be removed from the opening part by detaching from the shielding member 17 in which the holding part 26 integral with the holding cylinder 25 is fitted.

  Since the opening 15 is thus opened, when the rod 16 is pulled up, the strainer 10 attached to the tip is lifted and can be removed from the oil outlet 3. In this state, since the piping to the hydraulic pump is connected to the oil outlet 3, the hydraulic oil in the tank does not flow out.

  The strainer 10 removed from the tank and the rod 16 and the shielding member 17 attached to the strainer 10 are once taken out from the tank and then reversed so that the inside of the mounting nozzle 9 of the oil outlet 3 is now turned with the shielding member 17 facing downward. Insert so that the circumference fits. By doing so, the shielding member 17 closes the oil outlet 3. Since the O-ring 17 c is fitted on the inner peripheral surface of the cylindrical portion 17 b of the shielding member 17, the O-ring 17 c and the peripheral surface of the mounting nozzle 9 are brought into contact with each other when fitted on the mounting nozzle 9. Sealed.

  The strainer 10 attached to the rod 16 thus inverted is positioned below the opening 15 of the tank lid 2b with its lower end opening facing upward, and is attached to the support member 21 of the holding mechanism 20 that has been removed. Then, the holding cylinder 25 assembled in this manner is assembled to the opening 15 as it is. At this time, the holding part 26 at the lower part of the holding cylinder 25 is assembled so as to be inserted into the lower end opening part facing upward on the strainer 10. When the holding portion 26 is inserted into the strainer 10, the flange portion 25 b comes into contact with the end portion of the strainer 10. When the support member 21 is fastened to the mounting seat 18 with the bolt 19 in this state, the support member 21 The thrust by the coil spring 27 interposed between the guide holding portion 21c and the holding cylinder 25 is urged to the strainer 10 via the flange portions 25a and 25b of the holding cylinder 25. The thrust urged by the strainer 10 is transmitted to the shielding member 17 via the rod 16, so that the shielding member 17 firmly closes the oil outlet 3 even if the hydraulic oil swings in the tank due to external force. Thus, the hydraulic oil does not leak out. Therefore, when the pipe connected to the oil outlet 3 is removed and the fixing at the support portion of the tank is released, the hydraulic oil tank 1 can be separated from the machine body and transported.

  In this way, the oil outlet 3 of the hydraulic oil tank 1 can be closed by using the rod 16 for pulling out the strainer 10 and adding the shielding member 17 so that the oil outlet 3 can be closed when it is reversed. This is advantageous in that there is no need to prepare a separate oil outlet shielding device and there is no need to add an expensive valve.

  On the other hand, in order to attach the separated hydraulic oil tank 1 to the fuselage and return it to the use state, after connecting the pipe to the oil outlet 3, the support member 21 is attached to the tank lid in the same manner as the oil outlet 3 closing operation described above. When the strainer 10 and the shielding member 17 are reversed, the strainer 10 is fitted to the mounting nozzle 9 of the oil outlet 3, and the shielding member 17 positioned on the upper side is held by the holding mechanism 20. Restored. Then, the end of the rod 16 is positioned in the cap 28, and the detection of the rod by the sensor 30 recognizes that the controller 31 is fitted with the strainer 10 at the oil outlet 3 and can feed oil, so the engine is started. Then, driving is possible.

  As described above, in this embodiment, the rod 16 for mounting and checking the strainer 10 is used to detect the presence / absence of the end portion by the sensor 30, so that the oil is blocked by the shielding member 17 as described above. In the state where the outlet 3 is closed, as shown in FIG. 4, the strainer 10 is positioned on the upper side and is not detected by the sensor 30, so the controller 31 determines that the oil outlet 3 is closed and the engine 31 Can be prevented from malfunctioning.

  When the normal state is set, the thrust by the coil spring 27 to the shield member 17 attached to the rod 16 by the holding mechanism 20 is transmitted to the strainer 10 through the rod 16, so that the strainer 10 is securely fixed at the mounting position. Is done.

  In the above description of the embodiment, what is mounted on a hydraulic excavator is described, but it is needless to say that the hydraulic oil tank can be employed in other work machines. Further, in the above-described hydraulic oil tank, the one for one oil outlet is described, but when the amount of hydraulic oil handled is large, the strainer and the shielding member array are similarly arranged for a plurality of oil outlets. A corresponding number of holding mechanisms in the opening may be arranged.

Vertical section schematic diagram of hydraulic oil tank of this embodiment An enlarged cross-sectional view showing some of the main parts omitted Detailed enlarged view of rod holding mechanism (a) and AA view in the drawing (b) Schematic showing the tank oil outlet closed

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic oil tank 2 Tank main body 2a Tank bottom part 2b Tank cover body 3 Oil outlet 9 Attachment nozzle 10 Strainer 15 Tank cover body opening part 16 Rod 17 Shielding member 20 Holding mechanism 21 Support member 21c Guide holding part 23 Mounting seat plate 24 Receiving plate 25 Holding cylinder 26 Holding portion 27 Coil spring 28 Cap 30 Sensor

Claims (3)

A cylindrical strainer is arranged at the oil outlet provided at the bottom of the tank body of the required volume, a rod is provided on the top surface of the strainer, and a shielding member for closing the oil outlet is attached to the other end of the rod, In the hydraulic oil tank configured to close the oil outlet with the shielding member when the rod is reversed ,
A support member is attached to the opening of the tank lid provided at a position directly above the oil outlet, and a cylindrical guide holder is provided on the lower surface of the support member. A holding cylinder is provided so as to be freely movable up and down, and a lower outer peripheral surface of the holding cylinder is fitted to the shielding member to hold the shielding member. When the rod is reversed, the lower outer peripheral surface of the holding cylinder is A hydraulic oil tank fitted to an opening of the strainer to hold the strainer . A receiving plate is provided on the lower surface of the mounting seat that is fixed to the lower end of the guide holding portion, and the holding cylinder is provided with an inward flange portion, and the inward flange portion is an end of the receiving plate. The hydraulic oil tank according to claim 1, wherein the hydraulic oil tank is received so as not to be detached at a portion. Wherein with the cap on the upper surface of the support member is attached, the rod as the other end of the rod within the cap protrudes is disposed, a sensor for detecting the existence of the rod to the peripheral surface of said cap is provided The hydraulic oil tank according to claim 1 or 2 .

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