Multi-control valve

Abstract

Provided is a multi-control valve that can be compactly formed. The multi-control valve is provided with: a plurality of handling system valve elements; a plurality of travel system valve elements; a valve block including a loading / unloading-side passage connected to each of the plurality of loading / unloading system valve elements and a travel-side passage connected to each of the plurality of travel system valve elements, the valve block being inserted into each of the plurality of loading / unloading system valve elements and the plurality of travel system valve elements in an aligned manner; a plug-in valve block that controls the flow rate of the operating fluid flowing in the travel-side passage to preferentially flow the operating fluid to a loading / unloading priority valve body of the loading / unloading-side passage; the plurality of handling system valve elements and the plurality of travel system valve elements are respectively inserted in a first direction on the valve block and are arranged in a row in a second direction orthogonal to the first direction, and the handling priority valve element is arranged in a row relative to an adjacent valve element which is any one of the plurality of handling system valve elements and the plurality of travel system valve elements. The first and second electrodes are arranged in a third direction orthogonal to the first and second directions.

Description

Technical Field

[0001] The present utility model relates to a multi-control valve having a valve block through which a plurality of valve elements are inserted. Background Art

[0002] In construction machinery such as an excavator, there is a multi-control valve that controls the flow of working fluid to a travel motor and a loading / unloading actuator. As an example of the multi-control valve, for instance, a hydraulic control valve device of Patent Document 1 is known. In the hydraulic control valve device, there are a travel system valve element that controls the flow of working fluid to the travel motor and a loading / unloading system valve element that controls the flow of working fluid to the loading / unloading actuator. The travel system valve element and the loading / unloading system valve element are arranged in a row on the main block.

[0003] Prior Art Documents:

[0004] Patent Documents:

[0005] Patent Document 1: Japanese Unexamined Patent Publication No. 11-190044. Summary of the Utility Model

[0006] Problems to be Solved by the Utility Model:

[0007] In an excavator, the load pressure of the travel motor is smaller than the load pressure of the loading / unloading actuator. Therefore, when the loading / unloading actuator and the travel motor operate simultaneously, the working fluid easily flows to the travel motor. Thus, the inventor of the present application developed a loading-priority valve element. The loading-priority valve element throttles the flow rate of the working fluid flowing in the travel-side passage separately connected to the travel system valve element, so that the working fluid preferentially flows to the loading-side passage separately connected to the loading / unloading system valve element. The loading-priority valve element is provided on the main block in the same manner as other valve elements. On the other hand, a plurality of valve elements such as the travel system valve element and the loading / unloading system valve element are arranged on the main block. Therefore, the multi-control valve becomes large according to the position where the loading-priority valve element is arranged.

[0008] Therefore, an object of the present utility model is to provide a multi-control valve that can be formed compactly.

[0009] Means for Solving the Problem:

[0010] The multi-control valve of the present utility model includes: a plurality of loading and unloading system valve cores for a plurality of loading and unloading actuators; a plurality of traveling system valve cores for a plurality of traveling motors; a valve block including a loading and unloading side passage respectively connected to the plurality of loading and unloading system valve cores and a traveling side passage respectively connected to the plurality of traveling system valve cores, and the plurality of loading and unloading system valve cores and the plurality of traveling system valve cores are respectively inserted therethrough in an arranged manner; and a loading priority valve core inserted through the valve block, which makes the working fluid preferentially flow to the loading and unloading side passage by controlling the flow rate of the working fluid flowing in the traveling side passage; the loading and unloading system valve cores and the traveling system valve cores are respectively inserted through the valve block in a first direction and arranged in a second direction orthogonal to the first direction; the loading priority valve core is arranged relative to any one of the plurality of loading and unloading system valve cores and the plurality of traveling system valve cores, that is, an adjacent valve core, in a third direction orthogonal to the first direction and the second direction.

[0011] According to the present utility model, the loading priority valve core is arranged relative to the adjacent valve core in the third direction. Therefore, since the loading priority valve core is not arranged in the second direction relative to the loading and unloading system valve core and the traveling system valve core, the valve block can be prevented from becoming longer in the second direction. Thus, the multi-control valve can be formed compactly.

[0012] Effect of the utility model:

[0013] According to the present utility model, the multi-control valve can be formed compactly. Description of the drawings

[0014] Figure 1 is a top view showing the multi-control valve of the present embodiment of the present disclosure;

[0015] Figure 2 is a circuit diagram showing the hydraulic circuit of the multi-control valve Figure 1 constituting

[0016] Figure 3 is a cross-sectional view showing the multi-control valve cut along the cutting line III-III Figure 1 and observed;

[0017] Symbol description:

[0018] 1 Multi-control valve

[0019] 2 Bucket cylinder (loading and unloading system actuator)

[0020] 3 Arm cylinder (loading and unloading system actuator)

[0021] 4 Boom cylinder (loading and unloading system actuator)

[0022] 5 First traveling motor

[0023] 6 Second traveling motor

[0024] 7 Rotary motor

[0025] 8 Optional cylinder (loading and unloading system actuator)

[0026] 11 Valve block

[0027] 17 Tank

[0028] 21 First travel system spool valve

[0029] 22 Second travel system spool valve

[0030] 23 Spool valve for bucket (loading and unloading system spool valve)

[0031] 24 Spool valve for arm (loading and unloading system spool valve)

[0032] 25 Spool valve for boom (loading and unloading system spool valve)

[0033] 26 Spool valve for rotation (loading and unloading system spool valve)

[0034] 27 Optional spool valve (loading and unloading system spool valve)

[0035] 28 Spool valve for loading and unloading priority

[0036] 32 Loading and unloading side passage

[0037] 33 Travel side passage

[0038] 36 Tank passage

[0039] 41 Loading and unloading side connection passage

[0040] 41a First passage part

[0041] 41b Second passage part

[0042] 42 Travel side connection passage

[0043] 43 Tank connection passage

[0044] 43a Widened part

[0045] 44 Spool valve connection passage for rotation (spool valve connection passage for loading and unloading system)

[0046] 44a Extension part

[0047] 44b Double-strand part. Detailed implementation mode

[0048] Hereinafter, the multi-control valve 1 of the embodiment of the present disclosure will be described with reference to the foregoing drawings. In addition, the direction concepts used in the following description are only for convenience of explanation and do not limit the structure orientation of the utility model to this direction. Moreover, the multi-control valve 1 described below is only one embodiment of the present utility model. Therefore, the present utility model is not limited to the embodiment, and additions, deletions, and changes can be made without departing from the gist of the utility model.

[0049] <Multi-control valve>

[0050] As Figure 1 shown, the multi-control valve 1 is equipped on construction machinery such as an excavator. As Figure 2 shown, it includes hydraulic cylinders such as a bucket cylinder 2, an arm cylinder 3, and a boom cylinder 4, which are examples of loading and unloading actuators, and a swing motor 7. In addition, the construction machinery includes a first travel motor 5 and a second travel motor 6. Furthermore, the construction machinery also includes an optional cylinder 8, which is an example of a loading and unloading actuator. The first travel motor 5 and the second travel motor 6 respectively operate a pair of crawlers (not shown) provided in the travel device. The swing motor 7 rotates a rotating body (not shown) provided in the travel device. In addition, the bucket cylinder 2, the arm cylinder 3, and the boom cylinder 4 respectively operate a bucket, an arm, and a boom (all not shown) provided on the rotating body. In addition, the optional cylinder 8 operates, for example, a circuit breaker and a joint (NIPPLA).

[0051] The multi-control valve 1 is connected to a plurality of actuators 2-8. Moreover, the multi-control valve 1 controls the flow of the working fluid supplied and discharged to the plurality of actuators 2-8. In addition, in this embodiment, the multi-control valve 1 is a multi-control valve of a single-pump system having one pump port 35 as described later. As Figure 1 shown, the multi-control valve 1 includes a valve block 11, a first spool group 12, and a second spool group 13.

[0052] The valve block 11 has various passages 21a-27a, 21b-27b, 32, 33, 34, 36, 41-44 and respective ports 35, 36a, which will be described in detail later. The valve block 11 is formed, for example, in a rectangular parallelepiped shape. The valve block 11 is formed in a rectangular shape when viewed from above in the height direction. On the side surface (i.e., one side surface) of the valve block 11 located on the short side direction, there is formed Figure 2 the pump port 35 and the tank port 36a as shown. The respective ports 35, 36a are connected to the hydraulic pump 16 and the tank 17. In addition, on the side surface (i.e., the other side surface) of the valve block 11 located on the other side of the short side direction, a plurality of actuator ports are formed. Each actuator port is respectively connected to the plurality of actuators 2-8.

[0053] The first spool group 12 is as Figure 1The illustration includes a plurality of traveling system spool valves 21, 22 and loading / unloading system spool valves 23 to 27. The traveling system spool valves 21, 22 respectively correspond to traveling motors 5, 6 which are an example of traveling system actuators, and control the flow of the working fluid supplied to the corresponding traveling motors 5, 6. In the present embodiment, the traveling system spool valves 21, 22 are a first traveling system spool valve 21 and a second traveling system spool valve 22. The loading / unloading system spool valves 23 to 27 also respectively correspond to hydraulic cylinders 2 to 4 and hydraulic motors 7, 8 which are an example of loading / unloading actuators, and control the flow of the working fluid supplied to the corresponding hydraulic cylinders 2 to 4 and hydraulic motors 7, 8. In the present embodiment, the loading / unloading system spool valves 23 to 27 are a spool valve for a bucket 23, a spool valve for an arm 24, a spool valve for a boom 25, a spool valve for rotation 26, and a selectable spool valve 27. The second spool valve group 13 includes a loading / unloading priority spool valve with a unloading function (hereinafter, simply referred to as "loading / unloading priority spool valve") 28. In the present embodiment, the second spool valve group 13 further includes a boom regeneration spool valve 29 and a pressure compensation valve body 30.

[0054] Each of the spool valves 21 to 29 and the valve body 30 is slidably inserted through the valve block 11. More specifically, the spool valves 21 to 27 of the first spool valve group 12 control the flow of the working fluid to each actuator 2 to 8 by changing their positions. On the other hand, the spool valves 28 to 29 and the valve body 30 of the second spool valve group 13 achieve various functions (regeneration function, loading / unloading priority function, unloading function, and pressure holding function) by changing their positions.

[0055] Furthermore, the multi-control valve 1 is provided with a plurality of solenoid valves 14a to 14r as Figure 2 shown. Each of the solenoid valves 14a to 14r is provided on the valve block 11 corresponding to each of the spool valves 21 to 29 (for example, refer to Figure 1 ). Each of the solenoid valves 14a to 14r outputs a pilot pressure corresponding to the input signal to the corresponding spool valves 21 to 29. Thereby, each of the solenoid valves 14a to 14r changes the position of the corresponding spool valves 21 to 29, causing the corresponding spool valves 21 to 29 to stroke.

[0056] <Hydraulic Circuits in the Multi-Control Valve>

[0057] Hereinafter, refer to Figure 2Describe the hydraulic circuit 9 in the multi-control valve 1. As described above, the valve block 11 has various passageways. Moreover, as the passageways of the valve block 11, there are mainly a handling side passageway 32, a traveling side passageway 33, and a communication passageway 34. The handling side passageway 32 is connected to the pump port 35. The pump port 35 is connected to a hydraulic pump 16 that discharges the working fluid. The handling system spool valves 23 to 27 are connected to the handling side passageway 32 in a side-by-side manner. In the present embodiment, the handling system spool valves 23 to 27 are, as described above, the bucket spool valve 23, the arm spool valve 24, the boom spool valve 25, the swing spool valve 26, and the selectable spool valve 27, which control the working fluid supplied to the handling system actuators 2 to 4, 7, 8 respectively.

[0058] The bucket spool valve 23 controls the flow of the working fluid supplied to the bucket cylinder 2. To explain in more detail, the bucket spool valve 23 is connected to the handling side passageway 32 as described above. Also, the bucket spool valve 23 is connected to the tank port 36a via the tank passageway 36. In addition, the bucket spool valve 23 is connected to the head side port 2a of the bucket cylinder 2 via the head side passageway 23a, and is connected to the rod side port 2b of the bucket cylinder 2 via the rod side passageway 23b. Also, the bucket spool valve 23 is pressed in a direction opposing the pilot pressure output from each of the solenoid valves 14e, 14f, and strokes to a position corresponding to the pilot pressure of each of the solenoid valves 14e, 14f. The bucket spool valve 23 switches the connection destinations of the handling side passageway 32 and the tank passageway 36 by the stroke, and also adjusts the opening degree of the bucket spool valve 23. Thereby, the bucket spool valve 23 controls the flow of the working fluid relative to the head side port 2a and the rod side port 2b of the bucket cylinder 2.

[0059] The arm spool valve 24 controls the flow of the working fluid supplied to the arm cylinder 3. To explain in more detail, the arm spool valve 24 has a first spool member 24c and a second spool member 24d. The first spool member 24c and the second spool member 24d are respectively connected to the handling side passageway 32, and are also respectively connected to the tank port 36a via the tank passageway 36. In addition, the first spool member 24c and the second spool member 24d are connected to the head side port 3a of the arm cylinder 3 via the head side passageway 24a. Also, the first spool member 24c is connected to the rod side port 3b via the rod side passageway 24b. In addition, the first spool member 24c is pressed in a direction opposing the pilot pressure output from each of the solenoid valves 14g, 14h, and strokes to a position corresponding to the pilot pressure of each of the solenoid valves 14g, 14h. Also, the second spool member 24d is pressed in a form opposing the pilot pressure output from each of the solenoid valves 14h, 14i, and strokes to a position corresponding to the pilot pressure of each of the solenoid valves 14h, 14i. The first spool member 24c and the second spool member 24d switch the connection destinations of the handling side passageway 32 and the tank passageway 36 by the stroke, and also adjust the opening degrees of the first spool member 24c and the second spool member 24d respectively. Thereby, the arm spool valve 24 controls the flow of the working fluid relative to the head side port 3a and the rod side port 3b of the arm cylinder 3.

[0060] The boom spool 25 controls the flow of the working fluid supplied to the boom cylinder 4. More specifically, the boom spool 25 has a first spool member 25c and a second spool member 25d. The first spool member 25c and the second spool member 25d are respectively connected to the loading and unloading side passage 32, and are also respectively connected to the tank port 36a via the tank passage 36. In addition, the first spool member 25c is connected to the rod side port 4b via the rod side passage 25b. Also, the first spool member 25c is pressed in a direction opposite to the pilot pressure output from each of the solenoid valves 14j, 14k, and strokes to a position corresponding to the pilot pressure of each of the solenoid valves 14j, 14k. The second spool member 25d is connected to the head side port 4a of the boom cylinder 4 via the head side passage 25a. Also, the second spool member 25d is pressed in a direction opposite to the pilot pressure output from each of the solenoid valves 14k, 14l, and strokes to a position corresponding to the pilot pressure of each of the solenoid valves 14k, 14l. The first spool member 25c and the second spool member 25d switch the connection destinations of the loading and unloading side passage 32 and the tank passage 36 by stroking, and also adjust the opening degrees of the first spool member 25c and the second spool member 25d respectively. Thereby, the boom spool 25 controls the flow of the working fluid relative to the head side port 4a and the rod side port 4b of the boom cylinder 4.

[0061] The swing spool 26 controls the flow of the working fluid supplied to the swing motor 7. More specifically, the swing spool 26 is connected to the loading and unloading side passage 32 as described above. Also, the swing spool 26 is connected to the tank port 36a via the tank passage 36. In addition, the swing spool 26 is respectively connected to the first supply and discharge port 7a and the second supply and discharge port 7b of the swing motor 7 via the supply and discharge passages 26a, 26b. Also, the swing spool 26 is pressed in a direction opposite to the pilot pressure output from each of the solenoid valves 14m, 14n, and strokes to a position corresponding to the pilot pressure of each of the solenoid valves 14m, 14n. The swing spool 26 switches the connection destinations of the loading and unloading side passage 32 and the tank passage 36 by stroking, and also adjusts the opening degree of the swing spool 26. Thereby, the swing spool 26 controls the flow of the working fluid relative to the first supply and discharge port 7a and the second supply and discharge port 7b of the swing motor 7.

[0062] The selectable spool valve 27 can control the flow of the working fluid supplied to the selectable cylinder 8. More specifically, the selectable spool valve 27 is connected to the loading and unloading side passage 32 as described above. Also, the selectable spool valve 27 is connected to the tank port 36a via the tank passage 36. In addition, the selectable spool valve 27 is connected to the head side port 8a of the selectable cylinder 8 via the head side passage 27a and to the rod side port 8b via the rod side passage 27b. Also, the selectable spool valve 27 is pressed in a direction opposite to the pilot pressure output from each of the solenoid valves 14o, 14p and strokes to a position corresponding to the pilot pressure of each of the solenoid valves 14o, 14p. The selectable spool valve 27 switches the connection destinations of the loading and unloading side passage 32 and the tank passage 36 by the stroke and also adjusts the opening degree of the selectable spool valve 27. Thereby, the selectable spool valve 27 controls the flow of the working fluid with respect to the head side port 8a and the rod side port 8b of the selectable cylinder 8.

[0063] The traveling side passage 33 is connected to the loading and unloading side passage 32 via the loading and unloading priority spool valve 28 described in detail later. The working fluid of the hydraulic pump 16 is introduced into the traveling side passage 33 via the loading and unloading priority spool valve 28. Also, the traveling system spool valves 21, 22 are connected to the traveling side passage 33 in a side-by-side manner. Moreover, the traveling system spool valves 21, 22 respectively control the working fluid supplied to the corresponding traveling motors 5, 6.

[0064] The first traveling system spool valve 21 controls the flow of the working fluid supplied to the first traveling motor 5. The first traveling system spool valve 21 is connected to the traveling side passage 33 as described above. The first traveling system spool valve 21 is connected to the tank port 36a via the tank passage 36. The first traveling system spool valve 21 is respectively connected to the first supply / discharge port 5a and the second supply / discharge port 5b of the first traveling motor 5 via the supply / discharge passages 21a, 21b. The first traveling system spool valve 21 is pressed in a direction opposite to the pilot pressure output from each of the solenoid valves 14a, 14b and strokes to a position corresponding to the pilot pressure of each of the solenoid valves 14a, 14b. The first traveling system spool valve 21 switches the connection destinations of the traveling side passage 33 and the tank passage 36 by the stroke and also adjusts the opening degree of the first traveling system spool valve 21. Thereby, the first traveling system spool valve 21 controls the flow of the working fluid with respect to the first supply / discharge port 5a and the second supply / discharge port 5b of the first traveling motor 5.

[0065] The spool 22 of the second travel system controls the flow of the working fluid supplied to the second travel motor 6. More specifically, as described above, the spool 22 of the second travel system is connected to the travel side passage 33. Also, the spool 22 of the second travel system is connected to the tank port 36a via the tank passage 36. The spool 22 of the second travel system is connected to the first supply / discharge port 6a and the second supply / discharge port 6b of the second travel motor 6 via the supply / discharge passages 22a and 22b, respectively. The spool 22 of the second travel system is pressured in a direction opposing the pilot pressures output from the solenoid valves 14c and 14d, and strokes to a position corresponding to the pilot pressures of the solenoid valves 14c and 14d. The spool 22 of the second travel system switches the connection destinations of the travel side passage 33 and the tank passage 36 by stroking, and also adjusts the opening degree of the spool 22 of the second travel system to the opening degree. Thereby, the spool 22 of the second travel system controls the flow of the working fluid with respect to the first supply / discharge port 6a and the second supply / discharge port 6b of the second travel motor 6.

[0066] The communication passage 34 is connected to the spool 21 of the first travel system and the spool 22 of the second travel system. Moreover, the communication passage 34 connects the first travel motor 5 and the second travel motor 6 when supplying the working fluid to the first travel motor 5 and the second travel motor 6. More specifically, when the spool 21 of the first travel system strokes, the supply / discharge passages 21a and 21b connecting the first travel motor 5 and the travel side passage 33 are connected to the communication passage 34. Also, when the spool 22 of the second travel system strokes, the supply / discharge passages 22a and 22b connecting the second travel motor 6 and the travel side passage 33 are connected to the communication passage 34. Thereby, during straight travel, the deviation of the flow rate of the working fluid supplied to the two travel motors 5 and 6 when the first travel motor 5 and the second travel motor 6 are simultaneously operated is suppressed. Therefore, the straight travel performance of the construction machinery can be improved.

[0067] The spool 28 for loading / unloading priority controls the flow rate of the working fluid flowing in the travel side passage 33 to make the working fluid preferentially flow to the loading / unloading side passage 32. More specifically, the spool 28 for loading / unloading priority is connected to the loading / unloading side passage 32 and the travel side passage 33. The spool 28 for loading / unloading priority receives the pilot pressure from the solenoid valve 14q and strokes to a position corresponding to the pilot pressure of the solenoid valve 14q. Thereby, the opening degree of the spool 28 for loading / unloading priority is adjusted. Moreover, the spool 28 for loading / unloading priority controls the flow rate of the working fluid flowing in the travel side passage 33 by reducing the opening degree. Thereby, the spool 28 for loading / unloading priority makes the working fluid preferentially flow to the loading / unloading side passage 32.

[0068] For further details, the spool 28 for loading and unloading has a unloading function. More specifically, the spool 28 for loading and unloading is connected to the tank port 36a via the tank passage 36. The spool 28 for loading and unloading is located at the unloading position A1 when the pilot pressure from the solenoid valve 14q is less than the specified pressure. The spool 28 for loading and unloading connects the loading and unloading side passage 32 with the traveling side passage 33 and the tank passage 36 at the unloading position A1. Thereby, the loading and unloading side passage 32 is connected to the tank passage 36, and the hydraulic pump 16 becomes the unloading state.

[0069] Also, the spool 28 for loading and unloading is located at the traveling position A2 or the priority position A3 when the pilot pressure from the solenoid valve 14q is equal to or higher than the specified pressure. Thereby, the spool 28 for loading and unloading closes between the loading and unloading side passage 32 and the tank passage 36. On the other hand, at the traveling position A2 and the priority position A3, the loading and unloading side passage 32 is connected to the traveling side passage 33. Then, the working fluid flowing in the loading and unloading side passage 32 is introduced into the traveling side passage 33. On the other hand, the connection between the loading and unloading side passage 32 and the tank passage 36 is cut off. At the traveling position A2, the opening degree of the spool 28 for loading and unloading becomes the maximum opening degree (including fully open). At the priority position A3, the opening degree of the spool 28 for loading and unloading (i.e., the opening degree between the loading and unloading side passage 32 and the traveling side passage 33) is adjusted according to the position corresponding to the pilot pressure of each solenoid valve 14q. That is, at the priority position A3, the opening degree of the spool 28 for loading and unloading is reduced according to the stroke amount of the spool 28 for loading and unloading.

[0070] The spool 29 for arm regeneration controls the flow of the working fluid supplied from the rod side port 3b of the arm cylinder 3 to the head side port 3a. That is, the spool 29 for arm regeneration regenerates the working fluid discharged from the rod side port 3b at the head side port 3a.

[0071] The pressure compensation valve body 30 maintains the pressure of the loading and unloading side passage 32 by discharging the working fluid. More specifically, the pressure compensation valve body 30 is connected to the loading and unloading side passage 32. The pressure compensation valve body 30 connects the loading and unloading side passage 32 and the tank passage 36 according to the pressure of the loading and unloading side passage 32.

[0072] <Flow of Working Fluid in the Multi-Control Valve>

[0073] When the traveling motors 5 and 6 are driven, the multi-control valve 1 operates as follows. That is, when pilot pressure is output from any one of the solenoid valves 14a to 14d, the corresponding traveling system spool valves 21 and 22 operate. At this time, the loading / unloading priority spool valve 28 moves to the traveling position A2 by the pilot pressure from the solenoid valve 14q. For example, when pilot pressure is output from the solenoid valves 14a and 14c, the loading / unloading priority spool valve 28 moves to the traveling position A2 by the pilot pressure from the solenoid valve 14q and the traveling system spool valves 21 and 22 operate. Thereby, the working fluid from the hydraulic pump 16 is supplied to the respective traveling motors 5 and 6. Moreover, the respective traveling motors 5 and 6 rotate in the direction to advance the construction machine. At this time, the two traveling motors 5 and 6 are connected by the communication path 34. Thereby, the flow rate deviation of the working fluid supplied to the two traveling motors 5 and 6 is suppressed, so that the straight running performance of the construction machine can be improved.

[0074] Also, when the loading / unloading system actuators 2 to 4, 7, and 8 are driven, they operate as follows. That is, when pilot pressure is output from any one of the solenoid valves 14e to 14n, the corresponding spool valves 23 to 27 operate. At this time, the loading / unloading priority spool valve 28 moves to the priority position A3 by the pilot pressure from the solenoid valve 14q. For example, when pilot pressure is output from the solenoid valve 14e, the bucket spool valve 23 operates. At the same time, the loading / unloading priority spool valve 28 moves to the priority position A3 by the pilot pressure from the solenoid valve 14q, and the opening degree of the loading / unloading priority spool valve 28 is adjusted to the minimum opening degree (including fully closed). Then, the working fluid from the hydraulic pump 16 is preferentially supplied to the head side port 2a of the bucket cylinder 2, and the working fluid is discharged to the tank 17 after being pressed out from the rod side port 2b. Thereby, the bucket cylinder 2 extends.

[0075] Also, when pilot pressure is output from the solenoid valves 14g and 14i, the arm spool valve 24 operates. At the same time, the loading / unloading priority spool valve 28 moves to the priority position A3 by the pilot pressure from the solenoid valve 14q, and the opening degree of the loading / unloading priority spool valve 28 is adjusted to the minimum opening degree (including fully closed). Then, the working fluid from the hydraulic pump 16 is supplied to the head side port 3a of the arm cylinder 3, and the working fluid is pressed out from the rod side port 2b. At this time, by operating the arm regeneration spool valve 29, the working fluid pressed out from the rod side port 2b is regenerated at the head side port 3a.

[0076] In addition, when the traveling motors 5 and 6 and the handling system actuators 2 to 4, 7, and 8 are operated simultaneously, the following operations are performed. That is, when pilot pressure is output from any one of the solenoid valves 14a to 14d and pilot pressure is output from any one of the solenoid valves 14e to 14n, the corresponding valve spools 21 to 27 operate. At this time, the handling priority valve spool 28 moves to the priority position A3 by the pilot pressure from the solenoid valve 14q. Moreover, pilot pressure corresponding to the pilot pressure of each of the solenoid valves 14a to 14n is output from the solenoid valve 14q to adjust the opening degree of the handling priority valve spool 28. More specifically, the opening degree of the handling priority valve spool 28 is adjusted (more specifically, the opening degree is reduced) according to the operation amounts of the respective actuators 2 to 8. As a result, the flow rate of the working fluid flowing in the traveling side passage 33 is restricted, and the working fluid preferentially flows to the handling side passage 32. That is, when the traveling motors 5 and 6 and the handling system actuators 2 to 4, 7, and 8 are operated simultaneously, the working fluid can preferentially flow to the handling system actuators 2 to 4, 7, and 8.

[0077] In addition, in the multi-control valve 1, when none of the traveling motors 5 and 6 and the handling system actuators 2 to 4, 7, and 8 are operated, the following operations are performed. That is, the handling priority valve spool 28 is located at the unloading position A1. As a result, the handling side passage 32 is connected to the tank 17 via the handling priority valve spool 28. Thereby, the hydraulic pump 16 can be brought into an unloading state.

[0078] <Specific Structure of Multi-Control Valve>

[0079] Hereinafter, the specific structure of the multi-control valve 1 will be described. As Figure 1 shown, the valve block 11 of the multi-control valve 1 is formed, for example, in a substantially rectangular parallelepiped shape. The valve block 11 includes a block main body 11a and a first solenoid valve block 11b. Moreover, the respective valve spools 21 to 29 and the valve body 30 are inserted through the valve block 11 (the block main body 11a in the present embodiment).

[0080] The block main body 11a is formed, for example, in a substantially rectangular parallelepiped shape. The block main body 11a is formed in a rectangular shape when viewed from above on one side in the height direction as an example of the first direction. Moreover, the respective valve spools 21 to 29 and the pressure compensation valve body 30 are inserted through the block main body 11a as follows. That is, the respective valve spools 21 to 27 are inserted through the block main body 11a in the height direction and are arranged in the long side direction as an example of the second direction. More specifically, the respective valve spools 21 to 27 are inserted through the block main body 11a in a row in the long side direction and are parallel to each other when viewed from above. In addition, Figure 1Among them, the cover edges provided at one axial end (i.e., the height direction) of each spool 21-27 are arranged in a row along the long side direction. In the present embodiment, each of the spools 21-27 is arranged, for example, in the order of the boom spool 24, the first travel system spool 21, the selectable spool 27, the swing spool 26, the arm spool 25, the second travel system spool 22, and the bucket spool 23 from one side in the long side direction. In addition, the order in which the spools 21-27 are arranged along the long side direction is an example, and it may also be a different order from the above. In the present embodiment, each of the spools 21-27 of the first spool group 12 is inserted through the block body 11a in a row at the central portion in the short side direction. In the present embodiment, the long side direction is a direction orthogonal to the height direction, and the short side direction, as an example of the third direction, is a direction orthogonal to both the long side direction and the height direction. Also, "arranged in a row" does not necessarily mean arranged straight along the long side direction, as long as the spools 21-27 partially overlap each other when viewed from the long side direction.

[0081] Each of the spools 28, 29 and the valve body 30 is inserted through the block body 11a in the height direction and arranged in a row along the long side direction in plan view. That is, each of the spools 28, 29 and the pressure compensation valve body 30 is arranged in a row along the long side direction in plan view and inserted through the block body 11a in parallel with each other. Also, the loading / unloading priority spool 28 is arranged and configured relative to any one of the spools 21-27 included in the first spool group 12 in the short side direction. In the present embodiment, the loading / unloading priority spool 28 is adjacent to the swing spool 26, which is an example of an adjacent spool, in one side in the short side direction. Also, the spool 29 and the valve body 30 are arranged and configured relative to any one of the spools 21-27 included in the first spool group 12 in such a manner as to be adjacent to each other in one side in the short side direction. In the present embodiment, the spool 29 is adjacent to the boom spool 24 in one side in the short side direction, and the valve body 30 is adjacent to the first travel system spool 21 in one side in the short side direction. In addition, "adjacent in the short side direction" means overlapping each other when viewed in the short side direction. In the present embodiment, the loading / unloading priority spool 28 and the swing spool 26 are arranged Figure 3 as shown, in such a manner that their axes are located on a hypothetical plane orthogonal to the long side direction.

[0082] In addition, in the block body 11a, in Figure 3 the cross section shown, each passage is constituted as follows. In addition, Figure 3 the cross section shown is a cross section obtained by cutting the block body 11a with a hypothetical plane including the axis of the loading / unloading priority spool 28 and orthogonal to the long side direction. In the block body 11a, the loading side passage 32 and the travel side passage 33 are located between the loading / unloading priority spool 28 and the swing spool 26. Moreover, the loading side passage 32 and the travel side passage 33 extend along the long side direction (i.e., Figure 3extends inward from the front of the paper surface). In the present embodiment, the communication path 34 is also located between the loading / unloading priority spool 28 and the rotating spool 26 and extends in the long side direction. Also, the communication path 34, the traveling side path 33, and the loading / unloading side path 32 are arranged in a row in this order from the upper side in the height direction, for example. However, the order in which the respective paths 32, 33, 34 are arranged is not limited to the aforementioned order. Also, the tank path 36 is arranged in a form overlapping with the axial end portions ( Figure 3 the upper end portion and the lower end portion in the middle) respectively and extends in the long side direction.

[0083] Also, the block main body 11a has a loading / unloading side connection path 41, a traveling side connection path 42, and a tank connection path 43. The loading / unloading side connection path 41 is connected to the loading / unloading side path 32 and the loading / unloading priority spool 28. The loading / unloading side connection path 41 is located between the traveling side connection path 42 and the tank connection path 43. In the present embodiment, the loading / unloading side connection path 41 is located below the traveling side connection path 42 and above the tank connection path 43 in the height direction. Moreover, the loading / unloading side connection path 41 is formed in a double-strand shape having a first path portion 41a and a second path portion 41b. The first path portion 41a and the second path portion 41b each extend from the loading / unloading side path 32 toward the loading / unloading priority spool 28. In the present embodiment, the first path portion 41a bends upward from the loading / unloading side path 32 in an L shape and is connected to the loading / unloading priority spool 28. On the other hand, the second path portion 41b bends downward from the loading / unloading side path 32 in an L shape and is connected to the loading / unloading priority spool 28. Also, the first path portion 41a is connected to the traveling side connection path 42 via the loading / unloading priority spool 28, and the second path portion 41b is connected to the tank connection path 43 via the loading / unloading priority spool 28.

[0084] The traveling side connection path 42 connects the loading / unloading priority spool 28 and the traveling side path 33. In the present embodiment, the traveling side connection path 42 extends straight in the other short side direction from the loading / unloading priority spool 28 toward the traveling side path 33. The tank connection path 43 is connected to the loading / unloading priority spool 28 and the tank path 36. In the present embodiment, the tank connection path 43 is located offset in the height direction with respect to the tank path 36 on one side, for example, the upper side. Therefore, the tank connection path 43 is formed in a crank shape. Also, the tank connection path 43 has a widened portion 43a. The widened portion 43a is formed at a portion of the tank connection path 43 connected to the loading / unloading priority spool 28 and has a width wider than the width of the second path portion 41b.

[0085] In addition, the block body 11a (i.e., the valve block 11) further has a spool connection passage 44 for rotation. The spool connection passage 44 for rotation, which is an example of the spool connection passage of the loading and unloading system, connects the loading and unloading side passage 32 and the spool 26 for rotation. More specifically, the spool connection passage 44 for rotation has an extension portion 44a and a bifurcated portion 44b. The extension portion 44a is connected to the loading and unloading side connection passage 41 (in the present embodiment, the first passage portion 41a), and extends from the loading and unloading side connection passage 41 in the direction of the spool 26 for rotation. Also, the extension portion 44a extends across the spool 26 for rotation. That is, the extension portion 44a extends beyond the spool 26 for rotation and extends to the opposite side of the spool 28 for loading and unloading priority with respect to the spool 26 for rotation. Moreover, the extension portion 44a is connected to the bifurcated portion 44b via a check valve 45. The bifurcated portion 44b bifurcates into two branches in the upward and downward directions, that is, the upward and downward directions, from the check valve 45. Moreover, the separated portions of the bifurcated portion 44b are respectively connected to the spool 26 for rotation. Moreover, each portion of the bifurcated portion 44b is respectively connected to the supply and discharge passages 26a, 26b via the spool 26 for rotation. Moreover, by the stroke of the spool 26 for rotation, the connection between each portion of the bifurcated portion 44b and each supply and discharge passage 26a, 26b is opened and closed.

[0086] In addition, the block body 11a (i.e., the valve block 11) further has an insertion hole portion 46 and an exhaust passage 47. The insertion hole portion 46 extends in the height direction in the block body 11a. Moreover, the spool 28 for loading and unloading priority is slidably inserted into the insertion hole portion 46. The exhaust passage 47 connects the gap 46a between the spool 28 for loading and unloading priority and the insertion hole portion 46 and the tank passage 36. More specifically, the exhaust passage 47 is located on the opposite side of the loading and unloading side connection passage 41 with respect to the traveling side connection passage 42 in the height direction (in the present embodiment, one side in the height direction). Thus, the exhaust passage 47 can supplement the air entering from the opening on one side in the height direction of the insertion portion and guide it to the tank 17 via the tank passage 36. Thus, it is possible to suppress the air from being introduced into the traveling side connection passage 42.

[0087] The first solenoid valve block 11b is a block for mounting the first solenoid valve group 14A as Figure 1 shown. In addition, the first solenoid valve group 14A includes a plurality of solenoid valves 14a, 14c, 14e, 14g, 14h, 14j, 14k, 14m, 14o, 14q, 14r. In addition, the other solenoid valves 14b, 14d, 14f, 14i, 14l, 14n, 14p constitute a second solenoid valve group ( Figure 1 not shown in the figure) and are installed on the other side in the height direction of the block body 11a. The first solenoid valve block 11b is formed, for example, in a prismatic shape extending in the long side direction. The first solenoid valve block 11b is in Figure 1is provided on the side surface of the block main body 11a on one side in the short side direction as viewed from above. In the present embodiment, the first solenoid valve block 11b is mounted on one side surface of the block main body 11a and on a part on one side in the height direction. Moreover, solenoid valves 14a, 14c, 14e, 14g, 14h, 14j, 14k, 14m, 14o, 14q, 14r of the first solenoid valve group 14A are mounted on the main surface 11c of the first solenoid valve block 11b on one side in the height direction.

[0088] In the multi-control valve 1 of the present embodiment, the loading / unloading priority spool 28 is arranged relative to the rotation spool 26 in the short side direction. Therefore, the loading / unloading priority spool 28 is not aligned with the loading / unloading system spools 23 to 27 and the traveling system spools 21, 22 in the long side direction, so that the valve block 11 can be prevented from becoming longer in the long side direction. Thus, the multi-control valve 1 can be formed compactly.

[0089] Also, in the multi-control valve 1 of the present embodiment, the loading / unloading priority spool 28 opens and closes between the loading / unloading side passage 32 and the tank passage 36. Therefore, the loading / unloading priority spool 28 has two functions, namely, a loading / unloading priority function of preferentially flowing the working fluid to the loading / unloading side passage 32 and an unloading function of discharging the working fluid in the loading / unloading side passage 32 to the tank 17. Thus, the loading / unloading priority spool 28 can reduce the number of unloading valves and the number of components of the multi-control valve 1.

[0090] In addition, in the multi-control valve 1 of the present embodiment, the loading / unloading side connection passage 41 is formed in a double-strand shape having a first passage portion 41a and a second passage portion 41b. Therefore, in the loading / unloading side connection passage 41, the pressure receiving area of one end surface 41c formed by the first passage portion 41a and the second passage portion 41b can be reduced. Thus, the pressure acting in the loading / unloading side connection passage 41 can be reduced.

[0091] In addition, in the multi-control valve 1 of the present embodiment, the loading / unloading side passage 32 and the traveling side passage 33 are located between the rotation spool 26 and the loading / unloading priority spool 28 and extend in the long side direction. Therefore, the passage connecting the loading / unloading side passage 32 and the loading / unloading system spools 23 to 27 can be shortened, and the passage connecting the traveling side passage 33 and the traveling system spools 21, 22 can also be shortened. Also, since the loading / unloading side passage 32 and the traveling side passage 33 are formed between the rotation spool 26 and the loading / unloading priority spool 28, the spaces on both sides in the short side direction of the valve block 11 can be effectively utilized.

[0092] In addition, in the multi-control valve 1 of the present embodiment, the rotation spool connection passage 44 has an extension portion 44a extending across the rotation spool 26 and a bifurcated portion 44b that bifurcates into two and is connected to the rotation spool 26. Therefore, in the valve block 11, the bifurcated portion 44b can be formed in a portion on the opposite side of the rotation spool 26 with respect to the loading / unloading priority spool 28. Therefore, in the valve block 11, the bifurcated portion 44b can be formed in a relatively wide space, so the strength of the rotation spool connection passage 44 can be ensured.

[0093] In addition, in the multi-control valve 1 of the present embodiment, the tank connection passage 43 has a widened portion 43a on the loading / unloading priority spool 28 side with a width wider than the width of the second passage portion 41b. Therefore, more working fluid can flow into the tank connection passage 43.

[0094] In addition, in the multi-control valve 1 of the present embodiment, the spool adjacent to the loading / unloading priority spool 28 is the rotation spool 26. The rotation spool 26 can easily create a space in the short side direction, so the loading / unloading priority spool 28 can be arranged in the created space. Thereby, the valve block 11 can be formed compactly in the short side direction.

[0095] The valve block 11 includes an exhaust passage 47 that connects the gap 46a between the loading / unloading priority spool 28 and the insertion hole portion 46 and the tank passage 36. Therefore, the air that enters the gap 46a between the loading / unloading priority spool 28 and the insertion hole portion 46 can be guided to the tank 17 through the tank passage 36.

[0096] <Other Embodiments>

[0097] The loading / unloading system spools 23 to 27 included in the multi-control valve 1 of the present embodiment are an example, and spools for other uses may also be included, and the number thereof may also be reduced. Also, the number of the traveling system spools 21 and 22 included in the valve block 11 is not limited to two, and may be one or three or more. Additionally, various spools may also be provided on the valve block 11. Also, the order of the spools 23 to 27 arranged on the valve block 11 is not limited to the aforementioned order. In addition, the loading / unloading priority spool 28 does not necessarily have to have a unloading function. In this case, for example, a unloading valve is provided on the loading / unloading side passage 32. In addition, the spool adjacent to the loading / unloading priority spool 28 is not limited to the rotation spool 26, and may be other loading / unloading system spools 23 to 25, 27, or may also be the traveling system spools 21 and 22.

[0098] Furthermore, in the multi-control valve 1 of the present embodiment, the loading / unloading side passage 32, the traveling side passage 33, and the communication passage 34 do not necessarily have to be located between the rotation spool 26 and the loading / unloading priority spool 28. Also, the shapes of the loading / unloading side connection passage 41, the traveling side connection passage 42, and the tank connection passage 43 are examples and do not necessarily have to be the shapes as described above. For example, the loading / unloading side connection passage 41 does not necessarily have to be formed in a double-strand shape and may be formed in a straight line shape. Similarly, the shape of the rotation spool connection passage 44 is also an example and is not limited to the above-described shape. For example, the rotation spool connection passage 44 does not necessarily have to have the extension portion 44a and the double-strand portion 44b.

[0099] <Exemplary Embodiment>

[0100] The multi-control valve according to the first aspect includes: a plurality of loading / unloading system spools for a plurality of loading / unloading actuators; a plurality of traveling system spools for a plurality of traveling motors; a valve block including a loading / unloading side passage respectively connected to the plurality of loading / unloading system spools and a traveling side passage respectively connected to the plurality of traveling system spools, and being inserted through by the plurality of loading / unloading system spools and the plurality of traveling system spools arranged in a row; and a loading / unloading priority spool inserted through the valve block and configured to preferentially flow the working fluid to the loading / unloading side passage by controlling the flow rate of the working fluid flowing in the traveling side passage; the loading / unloading system spools and the traveling system spools are respectively inserted through the valve block in a first direction and arranged in a second direction orthogonal to the first direction; the loading / unloading priority spool is arranged relative to any one of the plurality of loading / unloading system spools and the plurality of traveling system spools, that is, an adjacent spool, in a third direction orthogonal to the first direction and the second direction.

[0101] According to the above aspect, the loading / unloading priority spool is arranged relative to the adjacent spool in the third direction. Therefore, since the loading / unloading priority spool is not arranged in the second direction relative to the loading / unloading system spool and the traveling system spool, the length of the valve block in the second direction can be suppressed. Thus, the multi-control valve can be formed compactly.

[0102] In the multi-control valve according to the second aspect, in the multi-control valve according to the first aspect, the valve block further includes a tank passage connected to a tank, and the loading / unloading priority spool is connected to the loading / unloading side passage, the traveling side passage, and the tank passage, and opens and closes between the loading / unloading side passage and the tank passage.

[0103] According to the above aspect, the loading / unloading priority spool opens and closes between the loading / unloading side passage and the tank passage. Therefore, the loading / unloading priority spool has two functions: a loading / unloading priority function of preferentially flowing the working fluid into the loading / unloading side passage and an unloading function of discharging the working fluid in the loading / unloading side passage to the tank. Thus, the loading / unloading priority spool can reduce the number of unloading valves, so the number of components of the multi-control valve can be reduced.

[0104] In the multi-control valve of the third aspect, in the multi-control valve of the second aspect, the valve block includes: a loading and unloading side connection passage connecting the loading and unloading side passage and the loading and unloading priority spool; a traveling side connection passage connecting the loading and unloading priority spool and the traveling side passage; and a tank connection passage connecting the loading and unloading priority spool and the tank passage; the loading and unloading side connection passage is formed in a double-strand shape as follows, that is, it has a first passage portion connected to the traveling side passage via the loading and unloading priority spool and a second passage portion connected to the tank connection passage via the loading and unloading priority spool.

[0105] According to the above aspect, the loading and unloading side connection passage is formed in a double-strand shape having a first passage portion connected to the traveling side connection passage via the loading and unloading priority spool and a second passage portion connected to the tank connection passage via the loading and unloading priority spool. Therefore, in the loading and unloading side connection passage, the pressure-receiving area of one end surface formed by the first passage portion and the second passage portion can be reduced. Thereby, the pressure acting on the loading and unloading side connection passage can be reduced.

[0106] In the multi-control valve of the fourth aspect, in the multi-control valve of the third aspect, the loading and unloading side passage and the traveling side passage are located between the adjacent spool and the loading and unloading priority spool and extend in the second direction.

[0107] According to the above aspect, the loading and unloading side passage and the traveling side passage are located between the adjacent spool and the loading and unloading priority spool and extend in the second direction. Therefore, the passage connecting the loading and unloading side passage and the loading and unloading system spool can be shortened, and the passage connecting the traveling side passage and the traveling system spool can also be shortened. Also, since the loading and unloading side passage and the traveling side passage are formed between the adjacent spool and the loading and unloading priority spool, the space on both sides of the valve block in the second direction can be effectively utilized.

[0108] In the multi-control valve of the fifth aspect, in the multi-control valve of the fourth aspect, the valve block further has a loading and unloading system spool connection passage connecting the loading and unloading side passage and the adjacent spool, and the loading and unloading system spool connection passage has an extension portion extending across the adjacent spool and a double-strand portion divided into two strands and connected to the adjacent spool.

[0109] According to the above aspect, the loading and unloading system spool connection passage has an extension portion extending across the adjacent spool and a double-strand portion divided into two strands and connected to the adjacent spool. Therefore, in the valve block, the double-strand portion can be formed at a portion on the opposite side of the loading and unloading priority spool with respect to the adjacent spool. Therefore, in the valve block, the double-strand portion can be formed in a wider space, so the strength of the loading and unloading system spool connection passage can be ensured.

[0110] In the multi-control valve of the sixth aspect, in the multi-control valve of any one of the third to fifth aspects, the tank connection passage has a widened portion in the first direction, and the width of the widened portion on the loading and unloading priority spool side is wider than the width of the second passage portion.

[0111] According to the above aspect, the tank connection passage has a widened portion on the spool side for loading and unloading priority with a width wider than the width of the second passage portion. Therefore, more working fluid can be discharged to the tank.

[0112] In the multi-control valve of the seventh aspect, among the multi-control valves of any one of the first to sixth aspects, the plurality of spools for loading and unloading systems include: a spool for the bucket that controls the flow of the working fluid supplied to the bucket cylinder; a spool for the arm that controls the flow of the working fluid supplied to the arm cylinder; a spool for the boom that controls the flow of the working fluid supplied to the boom cylinder; and a spool for rotation that controls the flow of the working fluid supplied to the swing motor; and the adjacent spools are the spools for rotation.

[0113] According to the above aspect, the adjacent spools are the spools for rotation. The spools for rotation are likely to create a space in the third direction, so the spool for loading and unloading priority can be arranged in the created space. Thus, the valve block can be formed compactly in the third direction.

[0114] In the multi-control valve of the eighth aspect, among the multi-control valves of any one of the first to eighth aspects, the valve block includes: an insertion hole portion through which the spool for loading and unloading priority is inserted; a tank passage connected to the tank; and an exhaust passage connecting the gap between the spool for loading and unloading priority and the insertion hole portion and the tank passage.

[0115] According to the above aspect, the valve block includes an exhaust passage connecting the gap between the spool for loading and unloading priority and the insertion hole portion and the tank passage. Therefore, the air that enters the gap between the spool for loading and unloading priority and the insertion hole portion can be introduced into the tank via the tank passage.

Claims

1. Multi-control valve, characterized in that, have: multiple loading and unloading system valve cores for multiple loading and unloading actuators; multiple travel system valve spools for multiple travel motors; A valve block including loading and unloading side passages connected to the plurality of loading and unloading system valve cores and traveling side passages connected to the plurality of traveling system valve cores, and the plurality of loading and unloading system valve cores and the plurality of traveling system valve cores are arranged and inserted through the valve block; and a loading and unloading priority valve core inserted into the valve block and controlling the flow rate of the working fluid flowing in the travel side passage so that the working fluid preferentially flows to the loading and unloading side passage; The loading and unloading system valve core and the traveling system valve core are respectively inserted through the valve block along a first direction and arranged in a second direction orthogonal to the first direction; The loading and unloading priority valve body is arranged in a third direction orthogonal to the first direction and the second direction with respect to any valve body among the plurality of loading and unloading system valve bodies and the plurality of traveling system valve bodies, that is, an adjacent valve body.

2. The multi-control valve according to claim 1, characterized in that: The valve block also includes a tank passage connected to the tank; The loading and unloading priority valve element is connected to the loading and unloading side passage, the traveling side passage, and the tank passage, and opens and closes between the loading and unloading side passage and the tank passage.

3. The multi-control valve according to claim 2, characterized in that: The valve block includes: a loading and unloading side connecting passage connecting the loading and unloading side passage and the loading and unloading priority valve core; a travel side connecting passage connecting the loading and unloading priority valve core and the travel side passage; and a tank connecting passage connecting the loading and unloading priority valve core and the tank passage; The loading and unloading side connection passage is formed in a bifurcated shape having a first passage portion connected to the travel side passage via the loading and unloading priority valve element and a second passage portion connected to the tank connection passage via the loading and unloading priority valve element.

4. The multi-control valve according to claim 3, characterized in that: The loading and unloading side passage and the traveling side passage are located between the adjacent valve core and the loading and unloading priority valve core, and extend along the second direction.

5. The multi-control valve according to claim 4, characterized in that: The valve block also has a loading and unloading system valve core connecting passage connecting the loading and unloading side passage and the adjacent valve core; The loading and unloading system valve core connecting passage comprises an extending portion extending across the adjacent valve cores and a double-branch portion divided into two branches and connected to the adjacent valve cores.

6. The multi-control valve according to claim 3, characterized in that: The tank connection passage has a widened portion having a width greater than that of the second passage portion on the loading and unloading priority valve body side in the first direction.

7. The multi-control valve according to claim 1, characterized in that: The plurality of loading and unloading system valve cores include: a bucket valve core that controls the flow of the working fluid supplied to the bucket cylinder; an arm valve core that controls the flow of the working fluid supplied to the arm cylinder; an arm valve core that controls the flow of the working fluid supplied to the arm cylinder; and a rotary valve element for controlling the flow of a working fluid supplied to the rotary motor; The adjacent valve core is the rotating valve core.

8. The multi-control valve according to claim 1, characterized in that: The valve block includes: an insertion hole through which the loading and unloading priority valve element is inserted; a tank passage connected to a tank; and an exhaust passage connecting a gap between the loading and unloading priority valve element and the insertion hole and the tank passage.

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