JP6837380B2 - Hydraulic oil storage mechanism and material handling and transporting machine equipped with it - Google Patents

Description

The present invention relates to a hydraulic oil storage mechanism for storing hydraulic oil of a hydraulic actuator, and a material handling and transporting machine including the same.

Unloaders used for loading and unloading cargo from transportation means such as ships, and cargo handling and transporting machines such as cranes used for loading and unloading materials at construction sites and the like are widely used. As the material handling and transporting machine, a type having a leg portion and a swivel portion such as an arm that can swivel with respect to the leg portion is known. The swivel portion of such a material handling machine is provided with a hydraulic actuator for operating each portion, and is provided with a hydraulic oil storage mechanism including an oil tank for storing the hydraulic oil of the hydraulic actuator.

Here, on the wall surface of the oil tank constituting the hydraulic oil storage mechanism, an air supply / exhaust port for supplying external air into the oil tank or discharging the air in the oil tank to the outside is provided. A device called an air breather is attached to the air supply / exhaust port. This air breather plays a role of removing moisture and foreign matter from the air passing through the air supply / exhaust port.

By the way, it has been conventionally proposed to install a wave-dissipating revetment structure in order to reduce the occurrence of large reflected waves due to reflection of waves hitting a harbor or the like on a quay (see, for example, Patent Document 1). In this wave-dissipating revetment structure, plate-shaped members having a plurality of holes formed are arranged at positions close to the quay. According to such a wave-dissipating revetment structure, the generation of reflected waves is reduced by absorbing the energy of the rushed waves when they pass through the holes of the plate-shaped member.

Japanese Unexamined Patent Publication No. 8-326028

However, the conventional hydraulic oil storage mechanism and the material handling and transporting machine provided with the hydraulic oil storage mechanism have a problem that the hydraulic oil leaks to the outside from the oil tank provided in the swivel portion. That is, when the swivel part of the cargo handling and transporting machine swivels around the vertical axis or around the horizontal axis for cargo handling or movement, or when the entire cargo handling and transporting machine traverses along the laid rail, inside the oil tank. The hydraulic oil sways greatly, and the swaying hydraulic oil hits the inner wall surface of the oil tank, causing oil splashing. When the oil splashed hydraulic oil hits the air breather, the hydraulic oil passes through the air supply / exhaust port and the air breather, so that the hydraulic oil leaks to the outside of the oil tank. When the hydraulic oil leaks to the outside in this way, the surroundings may be contaminated by the leaked hydraulic oil, and the operation of the hydraulic actuator may malfunction due to a decrease in the amount of the hydraulic oil.

Therefore, the present invention was conceived in view of such circumstances, and the purpose of the present invention is to pass through the air supply / exhaust port and the air breather even when the oil tank is installed in an environment where the hydraulic oil stored inside is likely to shake. It is an object of the present invention to provide a hydraulic oil storage mechanism capable of reducing leakage of hydraulic oil to the outside of an oil tank and a cargo handling and transporting machine equipped with the mechanism.

According to one aspect of the present invention, it is a hydraulic oil storage mechanism for storing the hydraulic oil of the hydraulic actuator, and is provided on the wall surface of the oil tank and the oil tank for storing the hydraulic oil to communicate with the outside. An air supply / exhaust port, an air filtration device attached to the air supply / exhaust port to filter the supplied or discharged air, and an oil splash prevention member provided at a position close to the wall surface inside the oil tank. Provided is a hydraulic oil storage mechanism , wherein the oil splash prevention member is a pipe assembled in a grid pattern.

Further, the hydraulic oil storage mechanism according to one aspect of the present invention is
A coolant for cooling the hydraulic oil may circulate inside the pipe.

Further, according to one aspect of the present invention.
A material handling machine having a leg portion and a swivel portion that can be swiveled with respect to the leg portion.
A material handling and transporting machine is provided in which the swivel portion includes the hydraulic oil storage mechanism described above.

According to the hydraulic oil storage mechanism according to one aspect of the present invention and the cargo handling and transporting machine provided with the hydraulic oil storage mechanism, the hydraulic oil is an air breather when the hydraulic oil is moved or when the swivel portion is swiveled around a vertical axis or a horizontal axis. It is possible to prevent the oil from leaking to the outside of the oil tank through the air supply / exhaust port.

It is a schematic side view which shows the structure of the continuous unloader provided with the hydraulic oil storage mechanism which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the turning operation of a continuous unloader. It is a schematic perspective view which shows typically the structure of the hydraulic oil storage mechanism which concerns on embodiment of this invention. It is a partially enlarged sectional view which enlarged the periphery of the air breather in an oil tank. It is a figure which shows the oil splash prevention piping which concerns on other embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

(Continuous unloader configuration)
FIG. 1 is a schematic side view showing a configuration of a continuous unloader 2 provided with a hydraulic oil storage mechanism 1 according to an embodiment of the present invention. The continuous unloader 2 is an example of a material handling and transporting machine used for unloading loose objects B such as coal loaded inside the ship S to the outside.

As shown in FIG. 1, the continuous unloader 2 includes a leg portion 3 arranged on a rail R provided on the wharf F, and a swivel portion 4 supported on the leg portion 3.

Here, FIG. 2 is an explanatory diagram for explaining the turning operation of the continuous unloader 2. The continuous unloader 2 has its swivel portion 4 positioned at a reference position P1 (position shown by a solid line in FIG. 2) during normal unloading work. On the other hand, the continuous unloader 2 has a clockwise turning position P2 (position shown by a broken line in FIG. 2) in which the turning portion 4 is turned clockwise by approximately 110 ° from the reference position P1 during maintenance work or in an emergency such as an earthquake. Or, it is possible to turn from the reference position P1 to the counterclockwise turning position P3 (the position indicated by the alternate long and short dash line in FIG. 2) which is turned counterclockwise by approximately 110 °.

As shown in FIG. 1, the legs 3 include traveling wheels 5 capable of traveling on the rail R, a girder 6 for supporting the traveling wheels 5, and two receiving conveyors 7 provided below the girder 6. It has a distribution chute 8 that can distribute and guide the loose objects B toward the vehicle.

As shown in FIG. 1, the swivel portion 4 includes a swivel frame 9 supported on the leg portion 3, a boom 10 supported by a vertical intermediate portion of the swivel frame 9 and extending in the horizontal direction, and a swivel frame 9. A balancing lever 11 that is supported by the top and extends horizontally in parallel with the boom 10, a top frame 12 that connects the tip of the boom 10 and the tip of the balancing lever 11, and a top frame 12 that is held by the top frame 12 in the vertical direction. It has a bucket elevator 13 extending to.

As shown in FIG. 1, the swivel frame 9 has a substantially triangular outer shape in a side view, and its base end portion is supported by a girder 6 so as to be swivelable around a vertical axis. Inside the swivel frame 9, a drop chute (not shown) capable of guiding the loose object B downward is provided from the vicinity of the end of the horizontal conveyor of the boom 10, which will be described later, of the distribution chute 8 of the leg 3. It is provided so as to extend to the vicinity of the starting end.

As shown in FIG. 1, the boom 10 has a substantially rectangular outer shape in a side view, its base end is rotatably supported by a swivel frame 9 around a horizontal axis, and its tip is a top frame. It is rotatably connected to 12 about a horizontal axis. According to the boom 10 configured in this way, when the boom 10 rotates with its base end as a fulcrum, the bucket elevator 13 supported by the tip of the boom 10 via the top frame 12 rises or falls. Although details are not shown in FIG. 1, a horizontal conveyor capable of transporting the loose object B from the tip end side to the base end side thereof is provided inside the boom 10 along the longitudinal direction thereof.

The balancing lever 11 serves to balance the boom 10. As shown in FIG. 1, the balancing lever 11 includes a lever body 15 having a substantially triangular outer shape in a side view, and a weight 16 provided at a base end portion of the lever body 15. In the balancing lever 11 configured in this way, the longitudinal intermediate portion of the lever body 15 is rotatably supported by the top of the swivel frame 9 around the horizontal axis, and the tip of the lever body 15 is attached to the top frame 12. On the other hand, it is rotatably connected around the horizontal axis. As a result, the total weight of the boom 10 and the bucket elevator 13 supported by the tip thereof is in equilibrium with the weight of the weight 16.

The top frame 12 serves to hold the bucket elevator 13 in a horizontal state. The top frame 12 has an arm portion 17 in which the tip portion of the boom 10 and the tip portion of the balancing lever 11 are rotatably connected to each other around a horizontal axis, and the bucket elevator 13 is integrally formed with the arm portion 17. It has a main frame portion 18 for holding and a main frame portion 18. According to the top frame 12 configured in this way, when the boom 10 rotates with its base end as a fulcrum, the arm portion 17, the boom 10, the swivel frame 9, and the balancing lever 11 of the top frame 12 rotate with each other. The vertically connected parallel link mechanism 19 is appropriately deformed so that the bucket elevator 13 is always held in a horizontal state regardless of the rotation of the boom 10.

The bucket elevator 13 plays a role of scraping the loose object B from the inside of the ship S and transporting it upward. As shown in FIG. 1, the bucket elevator 13 connects a plurality of sprockets 20 rotatably supported around an axis, an endless bucket chain 21 wound around the sprockets 20, and a plurality of sprockets 20. A hydraulic actuator 23 for driving the link mechanism 22 and a hydraulic oil storage mechanism 1 provided inside the lower casing 24 are provided. Although only the sprocket 20 and the bucket chain 21 exposed to the outside at the lower end of the bucket elevator 13 are shown in FIG. 1, the sprocket 20 and the bucket chain 21 extend over the entire length of the bucket elevator 13 extending in the vertical direction. Each is provided.

Here, FIG. 3 is a schematic perspective view schematically showing the configuration of the hydraulic oil storage mechanism 1, and FIG. 4 is a partially enlarged cross-sectional view of the periphery of the air breather 26 in the oil tank 25. For convenience of explanation, the oil tank 25 and the hydraulic oil O are shown by broken lines in FIG. As shown in FIG. 3, the hydraulic oil storage mechanism 1 includes an oil tank 25 having a substantially rectangular shape and an air breather 26 attached to the outer surface of the upper wall 25A of the oil tank 25 (“air filtration” in the claims. The device ”), a pair of oil splash prevention pipes 27 (“oil splash prevention member” in the claims) provided inside the oil tank 25, and protruding from the inner surface of the bottom wall 25B of the oil tank 25. It includes a partition plate 28 provided, and a hydraulic oil flow pipe 29 having one end connected to one side wall 25C of the oil tank 25 and the other end connected to the opposite side wall 25C.

The oil tank 25 serves to store hydraulic oil for supplying to the flood control unit. As shown in FIGS. 3 and 4, the oil tank 25 has a tank body 30 having a substantially rectangular parallelepiped shape, and an air supply / exhaust port 31 provided so as to penetrate the upper wall 25A of the tank body 30. The air supply / exhaust port 31 serves to supply the air outside the oil tank 25 to the inside or discharge the air inside the oil tank 25 to the outside.

The shape of the tank body 30 is not limited to a substantially rectangular parallelepiped shape, and can be any shape. Further, the position and number of air supply / exhaust ports 31 provided in the tank body 30 are not limited to this embodiment, and the design can be changed as appropriate. For example, the air supply / exhaust port 31 may be provided on the side wall 25C instead of the upper wall 25A or in addition to the upper wall 25A, or not only one but also a plurality of air supply / exhaust ports 31 may be provided.

The air breather 26 plays a role of removing moisture and foreign matter from the air supplied from the outside to the inside of the oil tank 25 through the air supply / exhaust port 31 or the air discharged from the inside to the outside. As shown in FIG. 4, the air breather 26 has a pipe portion 32 whose lower end is inserted into the air supply / exhaust port 31 and whose upper end is open, and a vent 33A on the bottom surface which is provided so as to cover the outside of the pipe portion 32. The hollow casing portion 33 provided, the air filter 34 arranged in the vicinity of the upper end opening of the pipe portion 32 inside the casing portion 33, and the dehumidification filled in the vicinity of the vent 33A inside the casing portion 33. It has agent 35 and.

According to the air breather 26 configured in this way, the air taken in from the outside to the inside of the casing portion 33 through the vent 33A passes through the dehumidifying agent 35 and the air filter 34, and then communicates with the pipe portion 32 and the supply thereof. It is supplied to the inside of the oil tank 25 through the exhaust port 31. On the other hand, the air discharged from the oil tank 25 through the air supply / exhaust port 31 and the pipe portion 32 is discharged from the inside of the casing portion 33 to the outside through the ventilation port 33A after passing through the air filter 34 and the dehumidifying agent 35. Then, the foreign matter is removed from the air when passing through the air filter 34, and the moisture is removed from the air when passing through the dehumidifying agent 35.

As the dehumidifying agent 35 and the air filter 34, conventionally known members can be appropriately used. As the dehumidifying agent 35, for example, silica gel or the like is used, and as the air filter 34, for example, a filter formed of glass fiber or the like is used. Can be done. Further, the positions of the dehumidifying agent 35 and the air filter 34 inside the casing portion 33 are reversed from those of the present embodiment, and the dehumidifying agent 35 is filled in the vicinity of the upper end opening of the pipe portion 32 and in the vicinity of the vent 33A. The air filter 34 may be arranged. Further, in the present embodiment, the air breather 26 having a function of removing both moisture and foreign matter from the air is used, but even if the air breather 26 has a function of removing only one of the moisture and the foreign matter from the air. Good.

The oil splash prevention pipe 27 plays a role of reducing the hydraulic oil O from causing oil splash inside the oil tank 25 and a role of circulating a coolant (not shown) for cooling the hydraulic oil O. As shown in FIG. 3, the oil splash prevention pipe 27 includes a main pipe 36 having a U-shaped portion 36A in the intermediate portion in the longitudinal direction, and a plurality of pipes 27 extending in parallel with the U-shaped portion 36A of the main pipe 36 at predetermined intervals. The horizontal pipe 37 is provided with a plurality of vertical pipes 38 extending in parallel with the U-shaped portion 36A of the main pipe 36 at predetermined intervals.

As shown in FIG. 3, each of the plurality of horizontal pipes 37 is provided so as to bypass the U-shaped portion 36A of the main pipe 36, and one end thereof is connected to a predetermined position of the main pipe 36 while the other end ends. It is connected to a position downstream from the connection position of. The outer diameter, extension direction, number of pipes, mutual spacing, etc. of these horizontal pipes 37 are not limited to this embodiment, and the design can be changed as appropriate.

As shown in FIG. 3, each of the plurality of vertical pipes 38 extends in a direction substantially orthogonal to the extending direction of the horizontal pipe 37, and one end is connected to the horizontal pipe 37 located at the uppermost portion, while the other end is mainly. It is connected to the pipe 36. Further, the intermediate portions of the vertical pipes 38 in the longitudinal direction are connected to a plurality of intersecting horizontal pipes 37, respectively. The outer diameter, extension direction, number of vertical pipes 38, mutual spacing, and the like are not limited to this embodiment, and the design can be changed as appropriate.

According to the oil splash prevention pipe 27 configured in this way, as shown in FIG. 3, the horizontal pipe 37 and the vertical pipe 38 are assembled in a grid pattern, and the main pipe 36, the horizontal pipe 37, and the vertical pipe 37 adjacent to each other are assembled. A gap 39 is formed between the pipes 38, respectively. These gaps 39 have a substantially rectangular shape when viewed from a direction substantially orthogonal to the plane on which the horizontal pipe 37 and the vertical pipe 38 are arranged. The shape and size of these gaps 39 are not limited to this embodiment, and can be appropriately changed by changing the outer diameter, extension direction, mutual spacing, etc. of the main pipe 36, the horizontal pipe 37, and the vertical pipe 38. The design can be changed. Further, in the present embodiment, all the voids 39 have the same shape and size, but the main pipe 36, the horizontal pipe 37, and the vertical pipe 38 so that each of the voids 39 has a different shape and size. The outer diameter, extension direction, mutual spacing, etc. may be set.

As shown in FIG. 3, in the pair of oil splash prevention pipes 27 configured in this way, one oil splash prevention pipe 27 is arranged at a position close to the inner side surface of one side wall 25C of the oil tank 25. At the same time, the other oil splash prevention pipe 27 is arranged at a position close to the inner side surface of the opposite side wall 25C. The bottom of the U-shaped portion 36A of the main pipe 36 is housed inside the oil tank 25, and each oil splash prevention pipe 27 is formed between the main pipe 36, the horizontal pipe 37, and the vertical pipe 38. The plurality of voids 39 are arranged so as to be immersed in the hydraulic oil O stored in the oil tank 25.

The separator plate 28 serves to roughly divide the internal space of the oil tank 25 into two. As shown in FIG. 3, the partition plate 28 is a plate-shaped member, and its width dimension is set to be substantially equal to or slightly smaller than the width dimension of the oil tank 25, and its height dimension is set. It is set smaller than the height dimension of the internal space of the oil tank 25. The partition plate 28 configured in this way is fixed to the inner surface of the bottom wall 25B of the oil tank 25.

The hydraulic oil flow pipe 29 serves to distribute the hydraulic oil O stored in the oil tank 25. As shown in FIG. 3, the suction side end portion 29A of the hydraulic oil flow pipe 29 penetrates one side wall 25C of the oil tank 25 and is inside the oil tank 25 and is a separator plate 28. It is located in the area on one side of the. Further, the return side end portion 29B, which is the other end of the hydraulic oil flow pipe 29, penetrates the opposite side wall 25C and is arranged in the other side region inside the oil tank 25 and sandwiching the separator plate 28. ing. Further, although details are not shown in the drawing, a pump capable of sucking the hydraulic oil O and a cooler capable of cooling the hydraulic oil O are provided at predetermined positions of the hydraulic oil flow pipe 29, respectively.

According to such a configuration, the hydraulic oil O heated to a high temperature by operating the hydraulic actuator 23 is sucked into the hydraulic oil flow pipe 29 from the suction side end 29A by the suction force of the pump, and the hydraulic oil flow pipe 29 is sucked. After being cooled by a cooler during circulation, the oil is returned to the oil tank 25 from the return side end 29B. Here, a separator plate 28 is provided inside the oil tank 25, and the suction side end portion 29A and the return side end portion 29B of the hydraulic oil flow pipe 29 are separated to some extent. Therefore, it is prevented that the hydraulic oil O returned from the return side end 29B to the oil tank 25 is immediately sucked into the hydraulic oil flow pipe 29 from the suction side end 29A, and the hydraulic oil O is to some extent inside the oil tank 25. Is designed to circulate.

According to the continuous unloader 2 configured as described above, the loose objects B stacked inside the ship S are scraped off by the bucket elevator 13 and transported upward, and then provided inside the boom 10. It is conveyed horizontally by a horizontal conveyor. Then, the loose object B that has fallen from the end of the horizontal conveyor is guided downward by the drop chute provided inside the swivel frame 9, and then is provided below the girder 6 by the distribution chute 8 of the leg portion 3. It is distributed to the receiving conveyors 7 of Article 2, and is conveyed to a predetermined destination by these receiving conveyors 7.

(Effect of continuous unloader equipped with hydraulic oil storage mechanism)
Next, the action and effect of the continuous unloader 2 provided with the hydraulic oil storage mechanism 1 according to the embodiment of the present invention will be described. The continuous unloader 2 swivels the swivel portion 4 from the reference position P1 shown in FIG. 2 to the clockwise swivel position P2 or the counterclockwise swivel position P3 during maintenance work or in an emergency such as an earthquake. At this time, since the bucket elevator 13 constituting the swivel portion 4 also swivels with the leg portion 3 as a fulcrum, the hydraulic oil storage mechanism 1 (see FIG. 1) provided inside the lower casing 24 of the bucket elevator 13 also swivels. Do.

In this case, since the oil tank 25 constituting the hydraulic oil storage mechanism 1 also performs a turning operation, the hydraulic oil O stored inside the oil tank 25 is shaken. However, as shown in FIG. 3, the oil splash prevention pipe 27 is arranged at a position close to the side wall 25C of the oil tank 25. Therefore, the hydraulic oil O in which the shaking occurs forms a gap 39 formed between the main pipe 36, the horizontal pipe 37, and the vertical pipe 38 constituting the oil splash prevention pipe 27 before hitting the side wall 25C of the oil tank 25. pass. At this time, the energy of the hydraulic oil O is absorbed by coming into contact with at least one of the main pipe 36, the horizontal pipe 37, and the vertical pipe 38 when passing through the gap 39. Therefore, as compared with the case where the hydraulic oil O directly hits the side wall 25C of the oil tank 25 without passing through the gap 39 of the oil splash prevention pipe 27, the oil after the hydraulic oil O has passed through the gap 39 of the oil splash prevention pipe 27. When it hits the wall surface of the tank 25, the oil splash generated in the hydraulic oil O becomes small. As a result, it is possible to reduce the oil splashed hydraulic oil O from leaking to the outside of the oil tank 25 through the air supply / exhaust port 31 formed on the upper wall 25A of the oil tank 25 and the air breather 26 attached to the air supply / exhaust port 31.

(Modification example)
Although the embodiments of the present invention have been described in detail above, the following modifications can be considered as the embodiments of the present invention.

(1) In the present embodiment, the oil splash prevention pipe 27 assembled in a grid pattern has been described as an example of the oil splash prevention member according to the present invention, but the oil splash prevention pipe 27 is limited to the shape of the present embodiment. However, it can be made into an arbitrary shape that can absorb the energy of the hydraulic oil O by passing through the gap 39. For example, the oil splash prevention pipe 40 assembled in a honeycomb shape in a plan view as shown in FIG. 5 (a), the oil splash prevention pipe 41 having a spiral shape in a plan view as shown in FIG. 5 (b), and the like. It is also possible to adopt the oil splash prevention pipe 42 assembled in a truss shape in a plan view as shown in FIG. 5 (c).

(2) In the present embodiment, a case where the pair of oil splash prevention pipes 27 are arranged at positions close to the inner side surfaces of the pair of side walls 25C facing each other in the oil tank 25 has been described. However, the position where the pair of oil splash prevention pipes 27 are arranged can be appropriately changed in design according to the arrangement position of the air breather 26 and the like. For example, among the four side walls constituting the oil tank 25, they face each other. A pair of oil splash prevention pipes 27 may be arranged at positions close to the inner side surfaces of the other pair of side walls 25D facing each other in the direction orthogonal to the pair of side walls 25C. Further, the two pairs of oil splash prevention pipes 27 may be arranged at positions close to the pair of side walls 25C and the pair of side walls 25D, respectively. In this case, there is an advantage that the occurrence of oil splashing inside the oil tank 25 is more reliably reduced. Further, when two pairs of oil splash prevention pipes 27 are arranged respectively, the hydraulic oil O may be freely circulated inside the oil splash prevention pipes 27 by connecting the oil splash prevention pipes 27 adjacent to each other. ..

(3) In the present embodiment, the continuous unloader 2 has been described as an example of the material handling and transporting machine according to the present invention. It is also possible to apply the oil storage mechanism 1.

(4) In the present embodiment, the case where the hydraulic oil storage mechanism 1 is provided in the material handling and transporting machine has been described, but if the oil tank 25 shakes and the hydraulic oil O stored inside is likely to be splashed with oil, It is also possible to apply the hydraulic oil storage mechanism 1 of the present invention to a device other than a material handling and transporting machine.

(5) In the present embodiment, by circulating a coolant inside the oil splash prevention pipe 27, the oil splash prevention pipe 27 not only has a function of reducing the oil splash of the hydraulic oil O, but also cools the hydraulic oil O. It also has a function to do. However, the oil splash prevention pipe 27 does not necessarily have to have a function of cooling the hydraulic oil O, and at least has a function of reducing the oil splash of the hydraulic oil O. However, it is faster and more reliable to provide the oil splash prevention pipe 27 with a function of cooling the hydraulic oil O as in the present embodiment as compared with the case where the hydraulic oil O is cooled only by the cooler. There is an advantage that O can be cooled. Although details are not shown in the figure, when the coolant is not circulated inside the oil splash prevention pipe 27, a solid columnar shape having a circular cross section or a polygonal cross section is used instead of the oil splash prevention pipe 27. It is also possible to use the member as an oil splash prevention member.

1 Hydraulic oil storage mechanism 23 Hydraulic actuator 25 Oil tank 25A Upper wall (wall surface)
26 Air Breather (Air Filtration Device)
27 Oil splash prevention piping (oil splash prevention member)
31 Air supply / exhaust port O Hydraulic oil

Claims (3)

A hydraulic oil storage mechanism for storing hydraulic oil for hydraulic actuators.
An oil tank for storing the hydraulic oil and
An air supply / exhaust port provided on the wall surface of the oil tank and communicating with the outside,
An air filtration device attached to the air supply / exhaust port to filter the air supplied or discharged.
An oil splash prevention member provided at a position close to the wall surface inside the oil tank, and
Equipped with a,
The oil splash prevention member is a hydraulic oil storage mechanism characterized by being pipes assembled in a grid pattern. The hydraulic fluid coolant for cooling the can, hydraulic oil storage mechanism according to claim 1, characterized in that flowing inside the pipe. A material handling machine having a leg portion and a swivel portion that can be swiveled with respect to the leg portion.
A material handling and transporting machine, characterized in that the swivel portion includes the hydraulic oil storage mechanism according to claim 1 or 2.

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