JP6621288B2 - Supply / discharge mechanism for work equipment - Google Patents

Description

  The present invention relates to a supply / discharge oil mechanism of a work machine, and more specifically, a device that uses oil as a lubricating oil, a cooling oil, a hydraulic oil, or the like, such as an engine, a compressor, or a hydraulic device. The present invention relates to a working machine having an oil storage tank for storing oil, such as an oil pan and an oil tank, and a supply / discharge oil mechanism for supplying and discharging oil to and from the oil storage tank when oil is exchanged.

  Equipped with working machines equipped with engines such as engine-driven generators and engine-driven compressors, working machines equipped with oil-cooled working machines such as oil-cooled screw compressors, and hydraulic equipment such as hydraulic excavators. In a working machine equipped with equipment that uses oil as lubricating oil, cooling oil, hydraulic oil, etc., a tank or container for storing oil such as an oil pan or an oil tank in its configuration In the present invention, these are collectively referred to as “oil storage tank”).

  And in these work machines, when they are used for equipment lubrication and cooling, or when the oil in use deteriorates over time due to contamination or oxidation, the lubrication and cooling functions of the oil, etc. As this causes a decrease in equipment performance and damage, etc., “oil change” is performed in which used oil is periodically removed from the oil storage tank and replaced with new oil.

  In such an oil change, the drain hole provided at the bottom of the oil storage tank is normally opened by removing the drain bolt that closes the drain hole, and the used oil that has flowed down from this drain hole is removed below the drain hole. After the used oil is completely discharged, the drain bolt is reattached to close the drain hole, and the oil filler (oil supply port) communicating with the oil storage tank is used for replacement. This is done by supplying new oil.

  When supplying and draining oil to and from the oil storage tank using the conventional method, the work equipment must be jacked in order to discharge the oil through the drain hole provided at the bottom of the oil storage tank. In some cases, it may be necessary to secure a work space below the work implement, for example.

  In this method, it is necessary to attach and detach the drain bolt in order to drain the used oil, and along with the attachment and detachment work of this drain bolt, it is also necessary to replace the sealing material such as packing attached to the drain bolt. Become.

  Moreover, when viscous oil is discharged due to natural fall, it takes time to complete the discharge, especially when oil is changed for large work equipment. For this reason, it takes a longer time to extract the used oil, and the amount of oil collected in the collection container increases. Therefore, the work of transporting the collection container to the disposal site when it is discarded becomes a heavy labor.

  Furthermore, after the used oil is discharged, new oil for replacement is supplied to the oil storage tank. However, the oil filler that is the oil supply port is provided above the oil storage tank. Therefore, it is necessary to work by pouring the oil in the heavy container containing the oil for use by lifting the oil filler up to the position of the oil filler and tilting it.

  In this way, in view of the difficulty in supplying and discharging oil to the oil storage tank provided in the work machine, it is conceivable to install a supply and discharge oil mechanism in the work machine for easy supply and discharge oil. It is not possible to confirm the existence of a work machine equipped with an oil draining mechanism.

  In addition, as a supply / discharge oil device configured as a device independent of a work machine, in Patent Document 1 described later, as shown in FIG. 7, an oil extraction tank 810 and a pump 812 are provided on a base 814, An external oil suction pipe 817 and an in-tank oil suction pipe 820 are connected to the suction port 815 of the pump 812 via a strainer 816 and a suction side valve V1, and a filter F and a discharge side valve V2 are connected to the discharge port 822 of the pump 812. An oil supply / drainage device 800 having a configuration in which an external pumping pipe 823 and a tank discharge pipe 824 are connected is disclosed.

  In the oil supply / discharge oil device 800 described in Patent Document 1 configured as described above, when the oil is extracted from the oil storage tank (hydraulic oil tank) 819 of the work machine 818 by adopting the above configuration, the suction side valve V1 is operated. Then, the port on the external oil suction pipe 817 side is opened to close the port on the tank oil suction pipe 820 side, and the discharge side valve V2 is operated to open the port on the tank discharge pipe 824 side and the external pressure feed pipe Switch to close the port on the 823 side, and in this state, remove the filler cap that closes the oil filler (oil supply port) of the work machine, etc., and remove external oil from the oil filler into the oil storage tank 819 as shown in FIG. The suction pipe 817 is inserted so that the tip of the suction pipe 817 is submerged in the oil, and the pump 812 is operated to suck the oil from the oil storage tank 819 through the external oil suction pipe 817. And the oil, and is configured to be able to recover the suction side valves V1, strainers 816, pump 812, filter F, the discharge side valve V2, and through the tank discharge pipe 824 oil extraction tank 810.

  In addition, when supplying new oil to the oil storage tank 819 of the working machine, the suction side valve V1 is maintained at the same switching position as that during the above-described extraction, and only the discharge side valve V2 is connected to the port on the external pressure feeding pipe 823 side. And the port on the side of the discharge pipe 824 in the tank is switched to close, and in this state, as shown in FIG. 8, the external oil suction pipe 817 is inserted into the external tank 832 such as a drum can in which new oil is stored. It is inserted so as to be immersed in the oil, and the tip of the external pumping pipe 823 is inserted into the oil storage tank 819 via the oil filler of the working machine 818, and the pump 812 is started, so that the external oil suction pipe 817 is inserted. The new oil in the external tank 832 sucked up by the suction side valve V1, strainer 816, pump 812, filter F, discharge Valves V2, and is configured to be able to refuel oil storage tank 819 of the working machine 818 through the external pumping tube 823.

  After supplying the required amount of oil into the oil storage tank 819 in this way, the operator stops the pump 812 and finishes the oil supply, pulls out the external pumping pipe 823 from the oil storage tank 819, and removes the oil from the external tank 832. After extracting the external oil suction pipe 817, the oil filler and oil supply work are completed by closing the oil filler in the oil storage tank 819 with a filler cap.

JP 59-16516 A

  In the oil supply / discharge oil device 800 described in Patent Document 1 described above, the used oil in the oil storage tank 819 of the work machine 818 is extracted from the oil storage tank 819 by the pump 812, so that the oil is extracted from the oil filler side. It is also possible to drain the oil without jacking up the work implement 818 or attaching / detaching the drain bolt.

  In addition, when supplying new oil, the oil pumped up by the pump 812 from the external tank 832 such as a drum can is supplied to the oil storage tank 819 of the work machine 818, so that a heavy container containing new oil for replacement is stored in the oil. The oil change work can be easily performed from the point that work such as lifting up to the filler position and pouring is unnecessary.

  However, the oil supply / discharge device 800 having the above-described configuration is configured as an independent device that is separate from the work machine 818, and is mounted on the work machine 818 and incorporated in a part of the configuration of the work machine 818. It is not an oil mechanism.

  Therefore, in order to discharge and supply oil to the oil storage tank 819 provided in the work machine 818 using the supply / discharge oil device 800 described in Patent Document 1, a maintenance factory in which the supply / discharge oil device 800 is installed. It is necessary to carry the work machine to the place where the work machine 818 is installed or to carry the work to the place where the work machine 818 is installed.

  Further, in the oil supply / discharge oil device 800 described in Patent Document 1, when the used oil is extracted from the oil storage tank 819 of the work machine 818, the external oil suction pipe 817 is communicated with the oil storage tank 819 of the work machine 818 for replacement. When the new oil is supplied, it is necessary to reconnect the external oil suction pipe 817 to the external tank 832 such as a drum can, and to connect the external pressure feed pipe 823 to the oil storage tank 819 of the work machine 818. During the oil extraction operation and the oil supply operation, it is necessary to individually operate the suction side valve V1 and the discharge side valve V2 so as to be in an appropriate switching position. In addition, the combination of the pipe connection destination and valve switching position is complicated and easy to make mistakes, and the pump 812 can be operated at the wrong pipe connection or valve switching position. Cause a malfunction and dynamic.

  Moreover, when it is considered that the oil supply / discharge oil mechanism is mounted on the work machine 818 and incorporated in the work machine structure, the piping is arranged in the soundproof box of the work machine 818, and in particular, the pipe for the oil storage tank 819. When connecting to the drain hole provided in the bottom of the oil storage tank 819, the connection is made at a deep position in the soundproof box, so that the oil storage tank 819 It is virtually impossible to manually connect different pipes, and the configuration of the oil supply / discharge oil device 800 described in Patent Document 1 is used as the structure of the oil supply / discharge oil mechanism mounted on the work machine as it is. It cannot be adopted.

  Therefore, the present invention was made to solve the above-described drawbacks of the prior art, and it is possible to remove oil from the oil storage tank of the work machine and to supply oil to the oil storage tank. There is no need to replace pipes, and it can be installed on a work machine and incorporated as part of the construction of the work machine. In addition, each part is set when oil is removed from the oil storage tank, and oil is supplied to the oil storage tank. It is an object of the present invention to provide an oil supply / drainage mechanism for a work machine that can be switched without mistakes by simple operations, thereby preventing erroneous connection or setting.

  Hereinafter, means for solving the problem will be described together with reference numerals used in the embodiment for carrying out the invention. This code is used to clarify the correspondence between the description of the scope of claims and the description of the mode for carrying out the invention. Needless to say, it is used in a limited manner for the interpretation of the technical scope of the present invention. It is not a thing.

In order to achieve the above object, the supply / discharge oil mechanism 10 of the working machine 1 according to the present invention includes:
In working machine 1 equipped with an oil storage tank 3 (in the illustrated example, an engine oil pan) for mounting oil (equipment 2 in the illustrated example) and storing the oil,
A supply and discharge oil pump 20 for supplying and discharging oil to the oil storage tank 3;
An oil storage tank side flow path 30 communicating between the oil supply / discharge oil pump 20 and the oil storage tank 3;
An external connection side flow path 40 extending from the supply / discharge oil pump 20 to the outside of the apparatus is provided;
In the oil storage tank side flow path 30,
An oil storage tank-side main flow path 31 having one end communicating with the oil storage tank 3;
An oil discharge connection for communicating the other end of the oil storage tank side main flow path 31 with the inlet 21 of the oil supply / discharge oil pump 20, and the other end of the oil storage tank side main flow path 31 as an outlet 22 of the oil supply / discharge oil pump 20. An oil storage tank side flow path switching means 32 configured to be able to switch between the oil supply connection to be communicated with, and
In the external connection side flow path 40,
An external connection side main flow path 41 having one end extended outside the apparatus;
An oil supply connection for communicating the other end of the external connection side main flow path 41 with the inlet 21 of the supply / discharge oil pump 20, and an other end of the external connection side main flow path 41 as the outlet 22 of the supply / discharge oil pump 20. An external connection side flow path switching means 42 configured to be able to switch between an oil drain connection to be communicated with,
The oil storage tank side flow path switching means 32 and the outside of the machine are connected so that the oil storage tank side flow path switching means 32 and the external connection side flow path switching means 42 are both the oil supply connection or the oil drain connection. A switching interlocking means 50 for interlocking the operation of the connection side flow path switching means 42 is provided,
The oil storage tank side flow path switching means 32 comprises:
An oil storage tank side suction flow path 321 having one end connected to the inlet 21 of the oil supply / drainage pump 20 and the other end connected to the other end of the oil storage tank side main flow path 31 when oil is discharged;
An oil storage tank-side discharge flow path 322 having one end communicating with the outlet 22 of the oil supply / discharge oil pump 20 and the other end communicating with the other end of the oil storage tank side main flow path 31 when refueling;
The external connection side flow path switching means 42 comprises:
An external connection side suction flow path 421 having one end communicated with the inlet 21 of the supply / discharge oil pump 20 and the other end communicated with the other end of the external connection side main flow path 41 when refueling;
An external connection side discharge flow path 422 having one end connected to the outlet 22 of the supply / discharge oil pump 20 and the other end connected to the other end of the external connection side main flow path 41 during oil discharge is provided. (Claim 1).

In the working machine 1 including the oil supply / discharge mechanism 10 having the above-described configuration,
The oil storage tank-side flow path shifting unit 32,
Before SL and the other end of the oil storage tank-side main flow path 31, the other end of the oil storage tank-side intake passage 321, and the oil storage tank side end of the discharge passage 322 is connected, the other end of the oil storage tank-side main flow path 31 To the other end of the oil storage tank side suction flow path 321 and the oil supply connection position to connect the other end of the oil storage tank side main flow path 31 to the other end of the oil storage tank side discharge flow path 322. An oil storage tank side three-way switching valve 323 configured to be switchable is provided ,
The outboard connection side flow path shifting unit 42,
Before SL and the other end of the outside connection-side main flow path 41, the other end of the outboard connection side intake passage 421, and the other end of the outboard connection side discharge passage 422 is connected, the outboard connection-side main flow path 41 is connected to the other end of the external connection side suction flow path 421, and the other end of the external connection side main flow path 41 is connected to the other end of the external connection side discharge flow path 422. An off-machine connection side three-way switching valve 423 configured to be able to be switched to an oil discharge connection position to be communicated may be provided (see claim 2: see FIGS. 1 to 4).

  In this case, the switching interlocking means 50 can be constituted by a link mechanism 51 that connects the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423 (Claim 3: FIGS. 1 and 2). reference).

Alternatively, both the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423 are constituted by electromagnetic valves,
The switching interlocking means 50 may be realized by a control means 52 that outputs switching signals for interlocking operation to the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423, respectively. 4: See FIGS. 3 and 4).

  In the present specification, the switching signal output by the control means includes a signal output stop state (no signal).

Furthermore, the oil storage tank-side flow path shifting unit 32,
The other end of the oil storage tank side main flow path 31 is connected to the other end of the oil storage tank side main flow path 31, and the other end of the oil storage tank side main flow path 31 is opened and closed . An oil storage tank side discharge flow path opening / closing valve 325 for opening and closing the oil storage tank side discharge flow path 322 communicated with the other end is provided ,
The oil reservoir connection suction passage opening / closing valve 324 is closed, the oil reservoir connection discharge passage opening / closing valve 325 is opened, and the oil storage reservoir suction port opening / closing valve 324 is opened, and the oil storage tank discharge flow is opened. It is possible to switch between the drainage connection and the road opening / closing valve 325 being closed,
The outboard connection side flow path shifting unit 42,
An external connection side suction flow path opening / closing valve 424 that opens and closes the external connection side suction flow path 421 that communicates with the other end of the external connection side main flow path 41, and the other end of the external connection side. An external connection side discharge flow path opening / closing valve 425 for opening and closing the external connection side discharge flow path 422 communicated with the other end of the main flow path 41 is provided ;
The external connection side suction flow path opening / closing valve 424 is closed, the external connection side discharge flow path opening / closing valve 425 is opened, and the external connection side intake flow path opening / closing valve 424 is opened. It may be possible to switch between the oil supply connection in which the outer connection side discharge flow path opening / closing valve 425 is closed (see claim 5: FIGS. 5 and 6).

  In the above-described configuration, the switching interlock means 50 includes the oil storage tank side suction flow path opening / closing valve 324, the oil storage tank side discharge flow path opening / closing valve 325, the external connection side suction flow path opening / closing valve 424, and the outside of the machine. It may be configured by a link mechanism (not shown) for connecting the connection-side discharge flow path opening / closing valve 425 (Claim 6).

Alternatively, the oil storage tank side suction flow path opening / closing valve 324, the oil storage tank side discharge flow path opening / closing valve 325, the external connection side suction flow path opening / closing valve 424, and the external connection side discharge flow path opening / closing valve 425 are provided. Both are composed of solenoid valves,
The switching interlocking means 50 includes the oil storage tank side suction flow path opening / closing valve 324, the oil storage tank side discharge flow path opening / closing valve 325, the external connection side suction flow path opening / closing valve 424, and the external connection side discharge flow rate. It may be realized by a control means 52 that outputs a switching signal that causes each of the path opening / closing valves 425 to operate in conjunction with each other (Claim 7).

  With the configuration of the present invention described above, the working machine 1 provided with the oil supply / discharge mechanism 10 of the present invention can obtain the following remarkable effects.

  By mounting the supply / discharge oil mechanism 10 on the work machine 1 itself, the work machine 1 is not transported to a facility such as a repair factory where the supply / discharge oil device is installed, or the supply / discharge oil device is installed on the work machine. It has become possible to easily supply and discharge oil using the supply and discharge oil mechanism 10 at any time and anywhere without transporting to a place.

  In addition, with the above configuration, the connection to the oil storage tank 3 is always made through the oil storage tank side flow path 30, and the external connection to the oil discharge tank 5, the new oil tank 6 and the like arranged outside the apparatus is always external. By being configured to be able to be performed via the connection side flow path 40, it is not necessary to replace the oil storage tank side main flow path 31 connected to the oil storage tank 3 even by switching between oil supply and drainage. Since one end of the extended external connection side main flow path 41 can be easily replaced by simply replacing it with the oil discharge tank 5 at the time of oil discharge operation and the new oil tank 6 at the time of oil supply operation, it is troublesome in the soundproof box 4. Manual reconnection of the flow path is not necessary, and it is possible to suitably prevent erroneous connections and malfunctions associated therewith.

  In addition, since the switching of the flow path system for the inlet 21 and outlet 22 of the supply / discharge oil pump 20 at the time of draining and refueling is interlocked by the switching interlocking means 50 (51, 52), an erroneous operation at the time of switching is also possible. This could be suitably prevented.

The piping diagram of the working machine provided with the oil supply / discharge oil mechanism of Example 1 (at the time of oil discharge). The piping diagram of the working machine provided with the oil supply / discharge oil mechanism of Example 1 (at the time of oil supply). The piping diagram of the working machine provided with the oil supply / discharge oil mechanism of Example 2 (at the time of oil discharge). The piping diagram of the working machine provided with the oil supply / discharge oil mechanism of Example 2 (at the time of oil supply). The piping diagram of the working machine provided with the oil supply / discharge oil mechanism of Example 3 (at the time of oil discharge). The piping diagram of the working machine provided with the oil supply / discharge oil mechanism of Example 3 (at the time of oil supply). A piping diagram showing a configuration example of a conventional oil supply / discharge oil device (when oil is discharged). Piping diagram showing a configuration example of a conventional oil supply / drainage system (when refueling)

  Below, the structural example of the working machine 1 of this invention provided with the oil supply / discharge oil mechanism 10 is demonstrated, referring an accompanying drawing.

[Example 1] (FIGS. 1 and 2)
The code | symbol 1 in FIG.1 and FIG.2 shows the working machine 1 provided with the oil supply / discharge mechanism 10 of this invention.

  The work machine 1 is configured by housing necessary equipment such as a drive source such as an engine 2 and a motor and a work machine body driven by the drive source in a soundproof box 4. In addition to oil and cooling oil, and those that use oil as hydraulic oil, those having an oil storage tank 3 such as an oil pan or an oil tank for storing this oil are equipped with a working machine equipped with the supply / discharge oil mechanism 10 of the present invention. It can be done.

  As an example, the oil supply / discharge mechanism 10 of the present invention is mounted on a working machine such as an air compressor equipped with an oil-cooled screw compressor body and used for cooling, lubrication, and sealing of the rotor chamber of the oil-cooled screw compressor. It can be used for exchanging hydraulic oil, or for exchanging hydraulic oil that is mounted on a hydraulic working machine such as a shovel car and introduced into a hydraulic motor, hydraulic cylinder, or the like.

  In the illustrated embodiment, a configuration example in which the supply / discharge oil mechanism 10 is mounted on a working machine in which the engine 2 is mounted is shown. In this configuration, the engine oil used for lubricating the engine 2 is stored. Oil stored in the oil storage tank (oil pan) 3 to be supplied is the target of supply and discharge oil.

  The oil supply / discharge oil mechanism 10 includes an oil supply / discharge oil pump 20 for supplying and discharging oil to an oil storage tank (oil pan) 3, and an oil storage tank side flow path communicating between the oil supply / discharge oil pump 20 and the oil storage tank 3. 30 and an external connection side flow path 40 that extends from the supply / discharge oil pump 20 to the outside of the apparatus and communicates with the oil discharge tank 5, the new oil tank 6 and the like outside the apparatus. A switching interlocking means 50 is provided to link the switching of the channel connection in the channel 30 and the switching operation of the channel connection in the external connection side channel 40.

  The above-described supply / discharge oil pump 20 includes an inlet 21 and an outlet 22, and can supply various oils as long as the oil, which is an object of supply / discharge oil, can be sucked from the inlet 21 and discharged from the outlet 22. For example, by incorporating a part of the flow path constituting the oil circulation system provided in the equipment mounted on the work machine into the structure of the oil supply / discharge mechanism 10 of the present invention. The oil pump originally provided in the oil circulation system may be used as the above-described supply / discharge oil pump, or a flow path completely different from the oil circulation system of such an installed device. It is good also as what comprises an electric pump etc. in this flow path separately, and comprises the oil supply / drain mechanism 10.

  The oil pump provided in the oil circulation system of the engine 2 is usually configured to rotate by the engine (for example, rotation of the camshaft of the engine). When the oil pump provided in the engine oil circulation system is also used as the supply / discharge oil pump 20 of the supply / discharge oil mechanism 10 in the supply / discharge oil mechanism 10 of the present embodiment used for oil replacement, the oil pump is used. A drive source such as an electric motor for driving is separately provided.

  The oil storage tank side flow path 30 described above is a flow path provided between the oil storage tank 3 and the oil supply / discharge oil pump 20, and in the illustrated embodiment, at the bottom of the oil storage tank 3 that is an oil pan of the engine 2. The drain hole provided and the supply / discharge oil pump 20 are communicated with each other.

  The oil storage tank side flow path 30 includes an oil storage tank side main flow path 31 communicated at one end to the oil storage tank 3, and the other end of the oil storage tank side main flow path 31 is connected to the inlet 21 of the oil supply / discharge oil pump 20. Oil storage tank side channel switching means 32 configured to be switchable between a drain oil connection (see FIG. 1) for communication and a fuel connection (see FIG. 2) for communication with the outlet 22 of the supply / drain oil pump 20 is provided. Yes.

  In the illustrated embodiment, the oil storage tank side flow path switching means 32 is connected to the oil storage tank side suction flow path 321 having one end communicating with the inlet 21 of the supply / discharge oil pump 20 and one end of the oil supply / drain oil. The oil storage tank side discharge flow path 322 communicated with the outlet 22 of the pump 20 and the oil storage tank side three-way switching valve 323 are connected to the other end of the oil storage tank side main flow path 31. The other end of the oil storage tank side suction flow path 321 and the other end of the oil storage tank side discharge flow path 322 are connected to each other, and the oil storage tank side main flow path 31 is stored in oil by the switching operation of the oil storage tank side three-way switching valve 323. The oil drain connection position (see FIG. 1) communicated with the inlet 21 of the oil supply / discharge oil pump 20 through the tank side suction flow path 321, and the other end of the oil storage tank side main flow path 31 through the oil storage tank side discharge flow path 322. Oil supply connection position (Fig. And the other end of the oil storage tank side main flow path 31 is sealed so that it can be selectively switched between a neutral position (not shown) where the communication with the oil supply / discharge oil pump 20 is blocked. Yes.

  Further, the above-mentioned external connection side flow path 40 is a flow path extending from the above-described supply / drain oil pump 20 to the outside of the apparatus (outside the soundproof box 4), and the external connection side having at least one end extended outside the apparatus. An oil supply connection (see FIG. 2) that includes the main flow path 41 and communicates the other end of the external connection side main flow path 41 to the inlet 21 of the supply / discharge oil pump 20 and an outlet 22 of the supply / discharge oil pump 20. The external connection side flow path switching means 42 is provided so as to be switchable between an oil drain connection (see FIG. 1) that communicates with the engine.

  In the illustrated embodiment, the above-mentioned external connection side main flow path 41 is configured to extend from the inside of the soundproof box 4 to the outside of the soundproof box via an outlet 4 a provided on the wall surface of the soundproof box 4. However, instead of this configuration, for example, a hose joint (not shown) is provided at the outlet 4a, and one end of the external connection side main flow path 41 is communicated with the hose joint on the inner side of the hose joint. On the other hand, an extension hose (not shown) may be connected to the outside of the machine so that the extension hose communicates with the drain oil tank 5 or the new oil tank 6 provided outside the machine.

  In the illustrated embodiment, the above-mentioned external connection side flow path switching means 42 is connected to the external connection side intake flow path 421 having one end communicating with the inlet 21 of the supply / exhaust oil pump 20, and one end is connected to the supply / discharge oil. An external connection side discharge flow path 422 communicated with the outlet 22 of the pump 20 and an external connection side three-way switching valve 423 are provided. The external connection side three-way switching valve 423 is connected to the external connection side main flow path 41. And the other end of the external connection side suction flow path 421 and the other end of the external connection side discharge flow path 422 are connected, and the external connection is made by switching the external connection side three-way switching valve 423. The oil supply connection position (see FIG. 2) where the side main flow path 41 is communicated with the inlet 21 of the oil supply / discharge oil pump 20 via the external connection side suction flow path 421, and the other end of the external connection side main flow path 41 is connected to the machine. The exhaust connected to the outlet 22 of the oil supply / discharge oil pump 20 via the external connection side discharge flow path 422. Alternately between the connection position (see FIG. 1) and the neutral position (not shown) where the other end of the external connection side main flow path 41 is sealed and the communication with the supply / discharge oil pump 20 is blocked. It is configured to be switchable.

  The oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423, which are configured as described above and constitute the oil storage tank side flow path switching means 32 and the external connection side flow path switching means 42, are shown in the illustrated embodiment. Are connected mechanically by a switching interlocking means 50, which is a link mechanism 51, whereby the two three-way switching valves 323 and 423 are configured to operate in an interlocked manner. By this interlocking operation, the oil storage tank side three-way switching valve is configured. The external connection side three-way switching valve 423 is also switched to the oil supply connection position when the H.323 is in the oil supply connection position, to the oil discharge connection position when in the oil discharge connection position, and to the neutral position when in the neutral position. Switching operation linked to is performed.

  In FIG. 1 and FIG. 2, reference numeral 60 denotes an operation mode selection means, and the supply / drainage mechanism 10 performs an operation corresponding to the selected operation mode by the selection of the operation mode by the operation mode selection means 60. It is configured.

  In this embodiment, a changeover switch 61 is employed as the operation mode selection means 60, and by switching the changeover switch 61, a “start” position for instructing start of refueling or draining and a “stop” for instructing these stops are provided. The operation command to the supply / discharge oil mechanism 10 can be performed by switching the position. When the position is switched to the “start” position, the supply / discharge oil pump 20 is operated to move from the inlet 21 to the outlet 22. When the oil flow is generated and switched to the “stop” position, the supply / discharge oil pump 20 is stopped to stop the above-described oil flow generation.

  The change-over switch 61 is constituted by an electrical switch for switching between conduction and interruption between a power source such as a storage battery (not shown) and the supply / discharge oil pump 20 when an electric pump is used as the supply / discharge oil pump 20. When the supply / drain oil pump 20 is driven by the input of a rotational driving force from a drive source (not shown), a switching lever or the like for switching the start and stop of power transmission between the drive source and the supply / discharge oil pump 20 (For example, a switching lever for switching between contact and non-contact in a contact-type power transmission mechanism).

  In the working machine 1 including the supply / discharge oil mechanism 10 configured as described above, when the oil supply / discharge oil is not being performed, the oil storage tank side three-way switching valve 323 linked by the switching interlocking means 50 and the outside of the machine Both of the connection side three-way switching valves 423 are operated to the neutral position (not shown), and the changeover switch 60 is set to the “stop” position to place the supply / discharge oil pump 20 in the stopped state.

  In this state, when the process of discharging the used oil in the oil storage tank 3 is performed, one end of the external connection side main flow path 41 drawn out of the soundproof box 4 through the outlet 4a [external connection When an extension hose (not shown) is connected to the side main channel 41, the tip of the extension hose is inserted into the oil drain tank 5 provided outside the soundproof box 4 to drain the discharged oil. It is set so that it can be recovered in the tank 5.

   In this state, the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423, both of which are in the neutral position, are both switched to the oil discharge connection position (see FIG. 1) by the switching interlocking means 50.

  By this switching operation by the switching interlocking means 50, the other end of the oil storage tank side main flow path 31 is connected to the oil storage tank side intake flow path 321 via the port ab of the oil storage tank side three-way switching valve 323 to supply and discharge oil. While communicating with the inlet 21 of the pump 20, the other end of the external connection side main flow path 41 is connected to the external connection side discharge flow path 422 via the port de of the external connection side three-way switching valve 423. , It communicates with the outlet 22 of the supply / discharge oil pump 20.

  In this state, when the changeover switch 61 is switched to the “start” position and the supply / discharge oil pump 20 is started, the oil in the oil storage tank 3 is stored in the oil storage tank side main flow path 31 connected via the drain hole, The oil is drawn from the inlet 21 of the supply / discharge oil pump 20 through the oil storage tank side three-way switching valve 323 and the oil storage tank side suction flow path 321, and is discharged from the outlet 22 of the supply / discharge oil pump 20. Oil discharged from the outlet 22 of the engine is disposed outside the soundproof box 4 via the external connection side discharge flow path 422, the external connection side three-way switching valve 423, and the external connection side main flow path 41. 5 is collected.

  At this time, since the port df of the external connection side three-way switching valve 423 is closed, the oil suction through the external connection side intake passage 421 connected to the inlet 21 of the oil supply / discharge oil pump 20 is not performed. In addition, since the port ac of the oil storage tank side three-way switching valve 323 is closed, the oil supply / drain oil is supplied to the oil storage tank side discharge passage 322 connected to the outlet 22 of the oil supply / discharge oil pump 20. The oil discharged from the outlet 22 of the pump 20 does not flow in.

  As described above, when the oil in the oil storage tank 3 is completely discharged, the changeover switch 61 is operated to stop the oil supply / discharge oil pump 20, and the oil storage tank side three-way switching valve 323 and the outside of the machine are switched by the switching interlocking means 50. Both the connection side three-way switching valve 423 is switched from the oil discharge connection position to the neutral position, and the port a of the oil tank side three-way switching valve 323 connected to the oil tank side main flow path 31 is connected to the oil tank side suction flow path 321. Is connected to the port b connected to the oil storage tank and the port c connected to the oil discharge tank side discharge flow path 322, and is connected to the external connection side three-way switching to which the external connection side main flow path 41 is connected. The port d of the valve 423 is a “stop position” that does not communicate with either the port e to which the external connection side discharge flow path 422 is connected or the port f to which the external connection side suction flow path 421 is connected.

  Also, one end of the external connection side main flow passage 41 inserted into the oil discharge tank 5 (the end of the extension hose when an extension hose is connected) is pulled out from the oil discharge tank 5 to perform the oil discharge operation. Is completed.

  As described above, after the used oil is drained from the oil storage tank 3 and the oil draining operation is completed, the oil supply operation for filling the oil storage tank 3 with new oil for replacement is performed by connecting to the external connection side. One end of the main channel 41 (the tip of the extension hose if an extension hose is connected) is inserted into the new oil tank 6 containing new oil for replacement, and the storage tank side is switched by the switching interlocking means 50. Both the three-way switching valve 323 and the external connection side three-way switching valve 423 are switched from the neutral position to the oil supply connection position (see FIG. 2).

   By this switching operation by the switching interlocking means 50, the other end of the oil storage tank side main flow path 31 is connected to the oil storage tank side discharge flow path 322 via the ports a-c of the oil storage tank side three-way switching valve 323 to supply and discharge oil. While communicating with the outlet 22 of the pump 20, the other end of the external connection side main flow path 41 is connected to the external connection side suction flow path 421 via the port df of the external connection side three-way switching valve 423. , It communicates with the inlet 21 of the supply / discharge oil pump 20.

  In this state, when the changeover switch 61 is switched to the “start” position and the supply / discharge oil pump 20 is started, the oil in the new oil tank 6 is switched between the external connection side main flow path 41 and the external connection side three-way. The air is sucked into the inlet 21 of the supply / discharge oil pump 20 through the valve 423 and the external connection side suction passage 421, and is discharged from the outlet 22 of the supply / discharge oil pump 20. The oil discharged from the oil storage tank 3 is supplied into the oil storage tank 3 through the oil storage tank side discharge flow path 322, the oil storage tank side three-way switching valve 323, and the oil storage tank side main flow path 31.

  At this time, since the port a-b of the oil tank side three-way switching valve 323 is closed, oil is not sucked through the oil tank side suction passage 321 connected to the inlet 21 of the oil supply / discharge oil pump 20. In addition, since the port de of the external connection side three-way switching valve 423 is closed, the oil supply / discharge oil is supplied to the external connection side discharge flow path 422 connected to the outlet 22 of the supply / discharge oil pump 20. The oil discharged from the outlet 22 of the pump 20 does not flow in.

  As described above, when the oil is supplied to the oil storage tank 3 and the oil is supplied until the oil level reaches an appropriate level, the changeover switch 61 is operated to stop the supply / discharge oil pump 20 and the switching By means of the means 50, the oil tank side three-way switching valve 323 and the external connection side three way switching valve 423 are both switched from the oil supply connection position to the neutral position, and the oil tank side three-way switching valve to which the oil tank main channel 31 is connected is operated. The port a of the H.323 is a “stop position” that does not communicate with either the port b to which the oil storage tank side suction flow path 321 is connected or the port c to which the oil storage tank side discharge flow path 322 is connected. The port d of the external connection side three-way switching valve 423 to which the main flow path 41 is connected, the port e to which the external connection side discharge flow path 422 is connected, and the port f to which the external connection side suction flow path 421 is connected. Anyway It does not communicate form a "stop position".

  Then, one end of the external connection side main flow path 41 inserted in the new oil tank 6 (the end of the extension hose when the extension hose is connected) is pulled out from the new oil tank 6 (the extension hose is connected). If it is, the extension hose is further removed and stored in a predetermined position in the soundproof box 4), and the oil supply / drainage operation is completed.

  Due to the configuration of the present invention described above, the working machine 1 equipped with the supply / discharge oil mechanism 10 of the present invention is compared with the case where the supply / discharge oil is supplied using the supply / discharge oil device introduced as Patent Document 1 described above. Thus, the oil supply / discharge operation can be easily performed in the following points.

  In the oil supply / drainage operation using the oil supply / discharge oil device 800 (see FIGS. 7 and 8) introduced as the above-mentioned Patent Document 1, the external oil suction pipe 817 is connected to the oil storage tank (the hydraulic oil tank) of the work machine 818 during oil discharge. ) 819, and at the time of transition from the oil discharge operation to the oil supply operation, the external oil suction pipe 817 is removed from the oil storage tank 819 and connected to the drum can (new oil tank) 832, and the external pressure feed pipe 823 is connected to the oil storage tank 819. It must be connected, and it is necessary to perform the work of attaching and detaching two pipes.

  Also, it is necessary to individually operate the suction side valve V1 and the discharge side valve V2 in accordance with the supply / discharge oil operation, and the operations of the suction side valve V1 and the discharge side valve V2 are not interlocked, so that the switching operation is performed. If mistaken, the desired work cannot be performed.

  On the other hand, in the working machine 1 of the present invention provided with the supply / discharge oil mechanism 10 having the above-described configuration, it is not necessary to perform any attachment / detachment work of the flow path to the oil storage tank 3, and the external connection side main flow path 41 is provided. By simply connecting one end of the oil from the oil discharge tank 5 to the new oil tank 6, the flow path connection work at the time of switching from the oil discharge work to the oil supply work can be completed. There is no worry.

  In addition, since the switching position of the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423 are linked by the switching interlocking means 50, there is no fear of erroneous operation at the time of switching. Can be easily implemented.

  Moreover, in the work machine 1 according to the present invention, the work machine 1 itself is equipped with the supply / discharge oil mechanism 10, so that when the supply / discharge oil is supplied, the work machine is moved to the place where the supply / discharge oil device is installed, or the work machine 1 The operation of moving the oil supply / discharge oil device to the installation location of the oil storage tank 3 is unnecessary, and a configuration in which not only the oil is discharged but also the oil supply through the drain hole of the oil storage tank 3 can be adopted. In addition, there is no need to provide an oil filler (oil filler port).

  In general, engine oil fillers are installed on the side of the cylinder block and near the top of the cylinder head. Therefore, when such oil fillers are installed, oil supply devices (oil mugs, oil guns, etc.) are used around these parts. However, in the configuration of the present invention, it is not necessary to secure such a space, and it is difficult to work through the maintenance opening provided in the side wall of the soundproof box 4. Even when the configuration in which the oil storage tank side main flow path 31 is connected to the oil storage tank 3 at a deep position is adopted, the oil storage tank side main flow path 31 does not need to be attached / detached, so that oil replacement may be hindered. Absent.

  In the description with reference to FIG. 1 and FIG. 2, the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423 are all in three positions of the oil discharge connection position, the neutral position, and the oil supply connection position. The case where the switchable one is used has been described as an example. However, instead of this configuration, the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423 are replaced by an oil discharge connection position and a fuel supply connection position. Alternatively, a three-way switching valve that can be switched only between the two positions may be used.

  In this case, a stop valve (not shown) for opening and closing them is provided in one or both of the oil storage tank side main flow path 31 and the external connection side main flow path 41.

  This stop valve may be provided at either one of the both ends of the oil storage tank side main flow path 31 and the external connection side main flow path 41 or at an intermediate position. The valves are opened, and at the end of the supply / discharge oil operation, these stop valves are closed so that oil does not leak through the supply / discharge oil mechanism 10.

  Further, in the configuration described with reference to FIGS. 1 and 2, the case where the changeover switch 61 and the changeover interlocking unit 50 are operated independently has been described as an example. 61 and the switching interlocking means 50 are further connected by a link mechanism or the like, and in conjunction with the operation of the selector switch 61, the switching interlocking means 50 performs the switching operation of the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423. You may make it do.

  In this case, the above-described changeover switch 61 described as switching between two positions of “stop” and “start” is configured to be switchable at three positions of “oil supply”, “drainage”, and “stop”. To do.

[Example 2] (FIGS. 3 and 4)
In the above-described first embodiment described with reference to FIGS. 1 and 2, the switching interlocking means 50 for interlockingly operating the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423 is used to perform these operations. However, in this embodiment, the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423 are both configured by electromagnetic valves. The interlocking operation described above is configured to be electrically interlocked by outputting a switching signal to the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423.

  In order to enable such electrical interlocking, in the configuration of the embodiment shown in FIGS. 3 and 4, switching signals are output to the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423, respectively. The control means 52 is provided, and the control means 52 realizes the above-described switching interlocking means 50 for operating the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423 in an interlocking manner.

  In the embodiment shown in FIGS. 3 and 4, the supply / discharge oil pump 20 is an electric pump, and the start and stop of energization of the supply / discharge oil pump 20 is controlled by the control means 52 described above. The operation of 20 can also be controlled by the control means 52.

  Further, as the above-described operation mode selection means 60, an input switch 62 capable of inputting operation instructions of “oil supply”, “drainage”, and “stop” is provided, and an oil level of an oil pan of the engine which is the oil storage tank 3 is provided on the oil level. A level sensor 70 for detecting the position is provided, and the control means 52 is connected to the oil storage tank side three-way switching valve 323 based on the operation instruction input by the input switch 62 and the detection signal from the level sensor 70, and connected to the outside of the machine. The operation of the side three-way switching valve 423 and the supply / discharge oil pump 20 was controlled.

  Specifically, the control means 52 makes both the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423 at the oil supply connection position when an operation instruction of “fuel supply” is input by the input switch 62. At the same time, the oil supply / discharge oil pump 20 is driven.

  When an operation instruction of “drainage” is input by the input switch, the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423 are both set to the drainage connection position and the feed / drainage pump 20 is turned on. To drive.

  Furthermore, when a “stop” operation instruction is input by the input switch 62, a detection signal is received from the level sensor 70 that detects that the oil level has dropped to the oil discharge completion position during the oil discharge operation, or When a detection signal is received from the level sensor 70 that detects that the oil level has risen to the refueling completion position during the refueling operation, the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423 are both neutral. And the supply / discharge oil pump 20 is stopped.

  In addition, refer to FIG. 1 and FIG. 2 for the connection state between each port of the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423 at each of the oil supply connection position, the oil discharge connection position, and the neutral position. This is the same as in the case of the first embodiment described above.

  In the working machine 1 provided with the oil supply / discharge oil mechanism 10 shown in FIGS. 3 and 4 configured as described above, when the oil in the oil storage tank 3 is discharged, one end of the external connection side main flow path 41 is connected to the work machine 1. It is inserted into the oil drain tank 5 arranged outside the soundproof box 4, and then the operation command of “drain oil” is input by operating the input switch 62.

  By the input of the “oil drain” operation command by the input switch 62, the control means 52 controls both the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423 to the drain oil connection position. In addition to outputting a switching signal for switching, energization to the supply / discharge oil pump 20 which is an electric pump is started to start the supply / discharge oil pump 20.

  Upon receipt of a switching signal for instructing switching to the oil drain connection position, the oil storage tank side three-way switching valve 323 communicates between ports a and b and connects the other end of the oil storage tank side main flow path 31 to the oil storage tank side suction flow. The external connection side three-way switching valve 423 is communicated between the ports de and the other end of the external connection side main flow path 41 with the other end of the external connection side main flow path 41. It communicates with the outlet 22 of the oil supply / discharge pump 20 via the outer connection side discharge flow path 422.

  The oil supply / discharge oil pump 20 is started simultaneously with the switching of the oil storage tank side three-way switching valve 323 and the external connection side three way switching valve 423, so that the oil in the oil storage tank 3 is stored in the oil storage tank side main flow path 31 and the oil storage tank side. The oil is sucked from the inlet 21 of the supply / discharge oil pump 20 through the three-way switching valve 323 and the oil storage tank side suction flow path 321, discharged from the outlet 22 of the supply / discharge oil pump 20, and the outlet 22 of the supply / discharge oil pump 20. The oil discharged from the external connection side discharge flow path 422, the external connection side three-way switching valve 423, and the external connection side main flow path 41 is collected in a drain oil tank 5 disposed outside the soundproof box 4. Is done.

  The oil draining process started in this way is stopped by the operator monitoring the oil draining state in the oil storage tank 3 and operating the input switch 62 to command “stop” when the oil draining is completed. However, in the present embodiment, the detection from the level sensor 70 that has detected that the oil level in the oil storage tank has been lowered to the predetermined oil drain completion position due to the discharge of the oil in the oil storage tank 3 is possible. Upon receipt of the signal, the control means 52 stops energization of the supply / discharge oil pump 20 to stop the supply / discharge oil pump 20, and each of the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423. On the other hand, a switching signal for switching these to the neutral position is output so that the oil draining operation can be completed.

  Thus, by providing the level sensor 70 and ending the oil draining operation based on the detection signal of the level sensor 70, the operator automatically operates without operating the input switch 62 when the oil draining operation is completed. Since the oil discharging operation can be stopped and the occurrence of problems such as abnormal heating and burning due to the idling of the oil supply / discharge oil pump 20 can be prevented, the operator need not constantly monitor the discharging operation.

  After the oil draining operation is completed in this manner, the operator removes one end of the external connection side main flow path 41 from the oil discharge tank 5 and also removes the new oil tank 6 containing new oil for replacement from the outside of the machine. One end of the connection-side main flow path 41 is inserted, and the input switch 62 is operated to command the start of “fuel supply”.

  By operating the input switch 62, the control means 52 outputs a switching signal to the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423, both of which are in the neutral position, and both of them are in the oil supply connection position. And the energization of the supply / discharge oil pump 20 is started to start the supply / discharge oil pump 20.

  By switching to the above-described oil supply connection position, the oil storage tank side three-way switching valve 323 communicates between ports ac and supplies the other end of the oil storage tank side main flow path 31 via the oil storage tank side discharge flow path 322. The external connection side three-way switching valve 423 communicates with the outlet 22 of the oil discharge pump 20 and communicates between the ports df to connect the other end of the external connection side main flow path 41 to the external connection side suction flow path. It is made to communicate with the inlet 21 of the oil supply / discharge oil pump 20 through 421.

  As a result, when the supply / discharge oil pump 20 is started, the oil in the new oil tank 6 flows from the external connection side main flow path 41, the external connection side three-way solenoid valve 423, the external connection side suction flow. Oil that is sucked into the inlet 21 of the oil supply / discharge oil pump 20 via the passage 421 and discharged from the outlet 22 of the oil supply / discharge oil pump 20 is the port of the oil storage tank side discharge flow path 322, oil storage side three-way switching valve 323. The oil storage tank 3 is supplied via the c-a and the oil storage tank side main flow path 31.

  The refueling process started in this manner may be stopped by the operator operating the input switch 62 and instructing a “stop” process. Similarly, when the level sensor 70 detects that the oil level in the oil storage tank 3 has risen to a predetermined oil supply completion position, the control means 52 stops energization of the oil supply / discharge oil pump 20 and stops the oil supply / discharge oil pump 20. In addition, a switching signal for switching these to the neutral position is output to each of the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423 to stop the fuel supply.

  By providing the level sensor 70 in this way and ending the refueling operation based on the detection signal of the level sensor 70, the refueling operation is automatically stopped without operating the input switch 62 when the refueling operation is completed. I was able to.

  In particular, if the amount of oil in the oil pan of the engine 2 is insufficient, there is a risk of engine seizure due to poor lubrication. On the other hand, excessive lubrication will cause problems such as engine malfunction and overflow. The oil pan has a structure that cannot be directly visually confirmed from the outside, even though it is necessary to supply oil at an appropriate oil level position. However, it is possible to accurately supply an appropriate amount of oil.

  Even when the control means 52 is configured to stop the oil draining process and the oil supplying process by receiving the detection signal from the level sensor 70 as described above, an operation command of “stop” is issued by the operation of the input switch 62 by the operator. When the input is made, the control means 52 switches both the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423 to the neutral position and stops the supply / discharge oil pump 20 to perform the oil discharge or oil supply operation. It is preferable to be able to stop.

  In the configuration of the present embodiment with reference to FIGS. 3 and 4, the oil storage tank side three-way switching valve 323 and the external connection side three-way switching valve 423 are disposed in the same manner as the configuration described as a modification of the first embodiment. The oil connection position, neutral position, and oil supply connection position may be switched between three positions, and the oil connection position and oil supply connection position may be switched between two positions. You may comprise so that the stop valve (not shown) mentioned above may be provided in either one or both of 31 and the external connection side main flow path 41.

  In this case, the stop valve is also constituted by a solenoid valve, and when the “stop” command is input from the input switch 62 or when the detection signal from the level sensor 70 is received, the oil draining and refueling operations are stopped. In this case, the oil storage tank side main flow path 31 and / or the external connection side main flow path 41 may be closed by the stop valve by the stop valve described above.

[Example 3] (FIGS. 5 and 6)
In the configuration of the first embodiment described with reference to FIGS. 1 and 2 and the configuration of the second embodiment described with reference to FIGS. 3 and 4, the oil storage tank side flow path switching means 32 and the outside of the machine are both included. Although an example in which the connection-side flow path switching means 42 is configured using the three-way switching valves 323 and 423 has been described, instead of this configuration, as shown in FIGS. Alternatively, one or both of the external connection side flow path switching means 42 (both in the example shown in FIGS. 5 and 6) are replaced with the above-described three-way switching valves 323 and 423, and a pair of on-off valves 324 and 325; It may be configured by 425.

  Thus, in order to configure the oil storage tank side flow path switching means 32 by a combination of a pair of on-off valves instead of the three-way switching valve, in this embodiment, one end is connected to the inlet 21 of the oil supply / drainage pump 20. The other end of the oil storage tank side suction flow path 321 and the other end of the oil storage tank side discharge flow path 322 whose one end is connected to the outlet 22 of the supply / discharge oil pump 20 are connected to the other of the oil storage tank side main flow path 31 respectively. An oil storage tank side suction flow path opening / closing valve 324 that opens and closes the oil storage tank side suction flow path 321 and an oil storage tank side discharge flow path opening / closing valve 325 that opens and closes the oil storage tank side discharge flow path 322 are provided. Adopted.

  Similarly, in order to configure the external connection side flow path switching means 42 by a combination of a pair of on-off valves, the external connection side intake flow path 421 having one end connected to the inlet 21 of the supply / discharge oil pump 20. And the other end of the external connection side discharge flow path 422 whose one end is connected to the outlet 22 of the supply / exhaust oil pump 20 to the other end of the external connection side main flow path 41 respectively. An external connection side suction flow path opening / closing valve 424 for opening and closing the external connection side suction flow path 421 and an external connection side discharge flow path opening / closing valve 425 for opening and closing the external connection side discharge flow path 422 are provided.

  During the oil draining process for discharging the oil in the oil storage tank 3, the oil storage tank side suction flow path opening / closing valve 324 is opened, the oil storage tank side discharge flow path opening / closing valve 325 is closed, and the external connection side suction flow path opening / closing valve is closed. 424 is closed, and the external connection side discharge flow path opening / closing valve 425 is opened, and the oil drain connection position (see FIG. 5) is established. The valve 324 is closed, the oil storage tank side discharge flow path opening / closing valve 325 is opened, the external connection side suction flow path opening / closing valve 424 is opened, and the external connection side discharge flow path opening / closing valve 425 is closed (see FIG. 6) can be switched.

  Further, when supply / discharge oil is stopped by the supply / discharge oil mechanism 10, the oil storage tank side suction flow path opening / closing valve 324, the oil storage tank side discharge flow path opening / closing valve 325, the external connection side suction flow path opening / closing valve 424, and the outside of the machine By switching all of the connection side discharge flow path opening / closing valve 425 to a closed, neutral position (not shown), an oil flow in the supply / discharge oil mechanism 10 is not generated.

  These oil storage tank side suction flow path opening / closing valve 324, oil storage tank side discharge flow path opening / closing valve 325, external connection side suction flow path opening / closing valve 424, and external connection side discharge flow path opening / closing valve 425 are linked to each other. It may be configured to be coupled by a mechanism or the like so as to be mechanically interlocked. However, in the embodiment shown in FIGS. 5 and 6, the on-off valves 324, 325, 424, and 425 described above are provided. Both are constituted by solenoid valves, and in the same manner as in the second embodiment described with reference to FIGS. 3 and 4, an electric pump is adopted as the supply / discharge oil pump 20, and “oil discharge”, “oil supply” and “ Based on the input switch 62 for inputting each operation command of "stop", the level sensor 70 for detecting the oil level position in the oil storage tank 3, the operation command by the input switch 62, and the detection signal from the level sensor 70 , The above-mentioned supply and discharge oil pump 0 and control means 52 for controlling the operation of each on-off valve 324, 325, 424, 425 are provided, and by this control means 52, the oil storage tank side suction flow path opening / closing valve 324, the oil storage tank side discharge flow path opening / closing valve 325, machine The switching interlocking means 50 for realizing the switching operation interlocked with the external connection side suction flow path opening / closing valve 424 and the external connection side discharge flow path opening / closing valve 425 is realized.

  In the working machine 1 equipped with the oil supply / discharge mechanism 10 shown in FIGS. 5 and 6 configured as described above, when the oil in the oil storage tank 3 is discharged, one end of the external connection side main flow path 41 is connected to the work machine 1. It is inserted into the oil drain tank 5 arranged outside the soundproof box 4, and then the operation command of “drain oil” is input by operating the input switch 62.

  In response to the input of the “drainage” operation command from the input switch 62, the control means 52 opens and closes the oil reservoir side suction flow path from the neutral position in which all of the on-off valves 324, 325, 424, 425 are closed. While opening the valve 324 and outputting the switching signal which opens the external connection side discharge flow path on-off valve 425, each on-off valve 324, 325, 424, 425 is switched to the oil drain connection position shown in FIG. The supply / discharge oil pump 20 is energized and the supply / discharge oil pump 20 is started.

  The oil storage tank side main flow path 31 communicates with the inlet 21 of the oil supply / discharge oil pump 20 via the oil storage tank side intake flow path 321 and the external connection side main flow path 41 by switching the oil discharge connection positions of the valves. Communicates with the outlet 22 of the oil supply / discharge oil pump 20 via the external connection side discharge flow path 422, between the oil storage tank side main flow path 31 and the inlet 21 of the oil supply / discharge oil pump 20, and the external connection side main flow path 41. And the outlet 22 of the oil supply / discharge oil pump 20 are blocked by the oil storage tank side discharge flow path opening / closing valve 325 and the external connection side intake flow path opening / closing valve 424 being kept closed.

  Therefore, when the supply / discharge oil pump 20 is started in such an operating state of the on-off valves 324, 325, 424, 425, the oil in the oil storage tank 3 is supplied to the oil storage tank side main flow path 31 and the oil storage tank side intake flow path. The oil that is sucked from the inlet 21 of the supply / discharge oil pump 20 through 321, discharged from the outlet 22 of the supply / discharge oil pump 20, and discharged from the outlet of the supply / discharge oil pump 20 is discharged from the external connection side discharge flow The oil is collected in the oil discharge tank 5 disposed outside the soundproof box 4 through the path 422 and the external connection side main flow path 41.

  Upon receiving a detection signal from the level sensor 70 that detects that the oil in the oil storage tank 3 has been discharged and the oil level has fallen to a predetermined oil discharge completion position, the control means 52 energizes the oil supply / discharge oil pump 20. Is stopped and the oil supply / discharge oil pump 20 is stopped, the oil storage tank side suction flow path opening / closing valve 324 is closed, and a switching signal for closing the external connection side discharge flow path opening / closing valve 425 is output. The oil draining operation is stopped by switching to the neutral position where 324, 325, 424, and 425 are closed.

  After the oil draining operation is completed in this way, the operator pulls out one end of the external connection side main flow path 41 from the oil drain tank 5 and inserts it into a new oil tank containing new oil for replacement. To start the “refueling” operation.

  By operating this input switch 62, the control means 52 causes the oil storage tank side discharge flow path opening / closing valve 325 and the external connection side suction from the neutral position where all the opening / closing valves 324, 325, 424, 425 are closed. A switching signal for opening the flow path opening / closing valve 424 is output to switch to the oil supply connection position (see FIG. 6), and energization of the oil supply / discharge oil pump 20 is started to start the oil supply / discharge oil pump 20.

  By switching to the aforementioned oil supply connection position, the oil storage tank side main flow path 31 communicates with the outlet 22 of the oil supply / discharge oil pump 20 via the oil storage tank side discharge flow path 322, and the external connection side main flow path 41 is connected to the machine. It communicates with the inlet 21 of the oil supply / discharge oil pump 20 via the external connection side suction flow path 421.

  In this state, the communication between the oil storage tank side main flow path 31 and the inlet 21 of the supply / discharge oil pump 20 and between the external connection side main flow path 41 and the outlet 22 of the supply / discharge oil pump 20 are respectively connected to the oil storage tank side suction flow. The passage on-off valve 324 and the external connection discharge flow passage on-off valve 425 are blocked by being kept closed.

  As a result, when the on-off valves 324, 325, 424, and 425 are opened / closed at the above-described oil supply connection positions, the oil in the new oil tank 6 is supplied to the external connection side main flow path. The oil discharged from the outlet 22 of the supply / exhaust oil pump 20 and the oil discharged from the outlet 22 of the supply / discharge oil pump 20 through the oil storage tank side discharge flow path 322 The oil is supplied to the oil storage tank 3 through the oil storage tank side main flow path 31.

  When the level sensor 70 detects that the oil level in the oil storage tank 3 has risen to a predetermined oil supply completion position, the oil supply process started in this way is the same as when the oil in the oil storage tank 3 is discharged. The control means 52 stops energization to the supply / discharge oil pump 20 to stop the supply / discharge oil pump 20, and at the same time opens the oil storage tank side discharge flow path opening / closing valve 325 and the external connection side intake flow path opening / closing valve 424. All are closed and switched to the neutral position where all the open / close valves are closed, and the lubrication process is completed.

  In the above-described configuration, all the on-off valves 324, 325, 424, and 425 have been described as being closed at the neutral position described above. However, the oil level in the oil storage tank 3 after the oil draining process is determined. When the oil discharge tank 5 and / or the oil supply tank 6 are arranged at a low position, the oil storage tank side suction flow path opening / closing valve 324 and the oil storage tank side discharge flow path opening / closing valve 325 are changed when switching to the neutral position. Although both are closed, the external connection side suction flow path opening / closing valve 424 and the external connection side discharge flow path opening / closing valve 425 may be set to the neutral position when both are open.

  With this configuration, the oil in the oil storage tank 3 is closed by the oil storage tank side suction flow path opening / closing valve 324 and the oil storage tank side discharge flow path opening / closing valve 325 in the neutral position where the supply / discharge oil is stopped. Although retained, the oil in the flow path on the drain oil tank 5 or the new oil tank 6 side is connected to the outside of the machine with respect to the oil storage tank side suction flow path opening / closing valve 324 and the oil storage tank side discharge flow path opening / closing valve 325. Since the side suction flow path opening / closing valve 424 and the external connection side discharge flow path opening / closing valve 425 are opened, the flow is recovered by naturally flowing down into the oil discharge tank 5 or the new oil tank 6 with a height difference. The residual oil inside can be extracted.

DESCRIPTION OF SYMBOLS 1 Work implement 2 Engine 3 Oil storage tank 4 Soundproof box 4a Drawer 5 Oil drain tank 6 New oil tank 10 Oil supply / exhaust mechanism 20 Oil supply / exhaust oil pump 21 Inlet (of oil supply / exhaust oil pump)
22 Outlet (of oil supply / drainage pump)
DESCRIPTION OF SYMBOLS 30 Oil tank side flow path 31 Oil tank side main flow path 32 Oil tank side flow path switching means 321 Oil tank side suction flow path 322 Oil tank side discharge flow path 323 Oil tank side three-way switching valve 324 Oil tank side suction flow path opening / closing valve 325 Oil storage tank side discharge flow path opening / closing valve 40 External connection side flow path 41 External connection side main flow path 42 External connection side flow path switching means 421 External connection side suction flow path 422 External connection side discharge flow path 423 External connection side three-way switching valve 424 External connection side suction flow path opening / closing valve 425 External connection side discharge flow path opening / closing valve 50 Switching interlock means 51 Link mechanism 52 Control means 60 Operation mode selection means 61 Changeover switch 62 Input switch 70 Level sensor 800 Oil supply / drainage device 810 Oil extraction tank 812 Pump 814 Base 815 Suction port (for pump)
816 Strainer 817 External oil suction pipe 818 Working machine 819 Oil storage tank (hydraulic oil tank)
820 Oil suction pipe in tank 822 Discharge port (for pump)
823 External pumping pipe 824 Discharge pipe in tank 832 External tank V1 Suction side valve V2 Discharge side valve F Filter

Claims (7)

In a working machine equipped with an oil storage device and an oil storage tank for storing the oil,
A supply and discharge oil pump for supplying and discharging oil to the oil storage tank;
An oil storage tank side flow path communicating between the oil supply / discharge oil pump and the oil storage tank;
An external connection side flow path extending from the supply / discharge oil pump to the outside of the apparatus is provided,
In the oil storage tank side flow path,
An oil storage tank side main flow path having one end communicating with the oil storage tank;
An oil connection connecting the other end of the oil storage tank side main flow path to the inlet of the oil supply / discharge oil pump; and an oil supply connection connecting the other end of the oil storage tank side main flow path to the outlet of the oil supply / discharge oil pump; Provided with oil tank side flow path switching means configured to be switchable,
In the external connection side flow path,
An external connection side main flow path with one end extending outside the machine;
Oil supply connection for communicating the other end of the external connection side main flow path with the inlet of the supply / discharge oil pump, and oil discharge for communication of the other end of the external connection side main flow path with the outlet of the supply / discharge oil pump An external connection side flow path switching means configured to switch between connections is provided,
The oil storage tank side flow path switching means and the external connection side flow path so that the oil storage tank side flow path switching means and the external connection side flow path switching means are both the oil supply connection or the oil discharge connection. A switching interlocking means for interlocking the operation of the path switching means is provided,
The oil storage tank side flow path switching means comprises:
An oil storage tank side suction flow path having one end communicated with an inlet of the oil supply / discharge oil pump and the other end communicated with the other end of the oil storage tank side main flow path when oil is discharged;
An oil storage tank side discharge flow path having one end communicating with the outlet of the oil supply / drainage pump and the other end communicating with the other end of the oil storage tank side main flow path when refueling;
The external connection side flow path switching means is
An external connection side suction flow path having one end communicated with the inlet of the supply / discharge oil pump and the other end communicated with the other end of the external connection side main flow path when refueling;
A working machine comprising an external connection side discharge flow path having one end communicated with an outlet of the supply / discharge oil pump and the other end communicated with the other end of the external connection side main flow path when oil is discharged. Supply and discharge oil mechanism. The oil storage tank-side flow path shifting unit,
The other end of the pre-Symbol oil storage tank-side main flow path, the other end of the oil storage tank-side intake passage, and the other end of the oil storage tank-side discharge passage is connected, the oil storage tank and the other end of the oil storage tank-side main flow path Oil storage position configured to be switchable to an oil discharge connection position that communicates with the other end of the side suction flow path, and an oil supply connection position that communicates the other end of the oil storage tank side main flow path with the other end of the oil storage tank side discharge flow path A tank side three-way switching valve is provided ,
The outboard connection side flow passage switching means,
The other end of the pre-Symbol outside connection-side main flow path, the other end of the outboard connection side intake passage, and the other end of the outboard connection side discharge passage is connected, the other end of the outboard connection-side main flow path An oil supply connection position for communicating with the other end of the external connection side suction flow path, and an oil discharge connection position for communicating the other end of the external connection side main flow path with the other end of the external connection side discharge flow path. switchably supply and discharge oil mechanism according to claim 1, wherein the working machine, characterized in that a configured outside connection side three-way valve.   The supply / discharge oil mechanism for a working machine according to claim 2, wherein the switching interlocking means is a link mechanism that connects the oil storage tank side three-way switching valve and the external connection side three-way switching valve. Both the oil storage tank side three-way switching valve and the external connection side three-way switching valve are constituted by electromagnetic valves,
3. The operation according to claim 2, wherein the switching interlocking means is realized by a control means for outputting a switching signal for operating the oil storage tank side three-way switching valve and the external connection side three-way switching valve, respectively. Machine oil supply / discharge mechanism. The oil storage tank-side flow path shifting unit,
The other end of the oil storage tank side main flow path is connected to the other end of the oil storage tank side main flow path, and the other end of the oil storage tank side main flow path is connected to the other end of the oil storage tank side main flow path. the oil storage tank side discharge flow passage opening and closing valve for opening and closing the oil storage tank side discharge passage is provided,
The oil supply connection for closing the oil storage tank side suction flow path opening / closing valve and opening the oil storage tank side discharge flow path opening / closing valve, and opening the oil storage tank side intake flow path opening / closing valve, and opening the oil storage tank side discharge flow path opening / closing valve. It is possible to switch between the oil drain connection and the closed,
The outboard connection side flow passage switching means,
And outside connection side suction flow passage opening and closing valve for opening and closing the outboard connection side intake passage and the other end communicating with the other end of the outboard connection-side main flow path, the other end of the outboard connection-side main flow path An external connection side discharge flow path opening / closing valve that opens and closes the external connection side discharge flow path communicated with the other end ;
Close the external connection side suction flow path open / close valve, open the external connection side discharge flow path open / close valve, open the oil connection, open the external connection side intake flow path open / close valve, open the external connection side 2. The oil supply / drainage mechanism for a working machine according to claim 1, wherein the oil supply connection with the discharge flow path opening / closing valve closed can be switched.   The switching interlock means includes the oil storage tank side suction flow path opening / closing valve, the oil storage tank side discharge flow path opening / closing valve, the external connection side suction flow path opening / closing valve, and the external connection side discharge flow path opening / closing valve. The supply / discharge oil mechanism for a work machine according to claim 5, wherein the supply / discharge oil mechanism is a link mechanism to be connected. The oil storage tank side suction flow path opening / closing valve, the oil storage tank side discharge flow path opening / closing valve, the external connection side suction flow path opening / closing valve, and the external connection side discharge flow path opening / closing valve are all constituted by electromagnetic valves. As well as
The switching interlock means includes: an oil storage tank side suction flow path opening / closing valve; an oil storage tank side discharge flow path opening / closing valve; the external connection side suction flow path opening / closing valve; and the external connection side discharge flow path opening / closing valve. 6. The oil supply / discharge mechanism for a work machine according to claim 5, wherein the oil supply / discharge mechanism for the work machine is realized by a control means for outputting a switching signal for interlocking each other.

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