Work machinery

Abstract

To reduce work load by facilitating adjustment of the position of a stop valve.SOLUTION: A work machine according to an embodiment of the present disclosure includes a mounting seat provided in an attachment of the work machine, a joint member fixed to the mounting seat by a first fixing member, and a stop valve fixed to the joint member by a second fixing member. The position of the joint member relative to the mounting seat and the position of the stop valve relative to the joint member are adjustable.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to work machines. [Background technology]

[0002] Conventionally, there have been known work machines equipped with an attachment connected to the front of a rotating upper body so that it can be raised or lowered. While a bucket is usually attached to the tip of the attachment, other end attachments can also be attached instead of the bucket. In the work machine, a spare hydraulic line is added to drive the other end attachment.

[0003] When no other end attachments are installed, the spare hydraulic pipe must be disconnected from the newly installed hydraulic pipe. For this reason, a stop valve that can be switched between communication and disconnection is connected to the tip of the hydraulic pipe (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-152466 Summary of the Invention [Problem to be solved by the invention]

[0005] In the technology described in Patent Document 1, a stop valve is fastened and fixed to a fastening block attached to an arm. The position of the stop valve can be adjusted by adjusting the difference between the diameter of the insertion hole provided in the stop valve and the diameter of the fastening bolt, but it is difficult to adjust the distance from the side of the arm to the stop valve.

[0006] In view of the above problem, an object of the present invention is to provide a technique that makes it easy to adjust the stop valve position. [Means for solving the problem]

[0007] In order to achieve the above object, a work machine according to one embodiment of the present disclosure includes a mounting seat provided on an attachment of the work machine, a joint member fixed to the mounting seat by a first fixing member, and a stop valve fixed to the joint member by a second fixing member, and the position of the joint member relative to the mounting seat and the position of the stop valve relative to the joint member are adjustable. a direction in which the position of the joint member relative to the mounting seat can be adjusted and a direction in which the position of the stop valve relative to the joint member can be adjusted are partially different from each other. . [Effects of the Invention]

[0008] According to the above-described embodiment, an object is to provide a technique that makes it easy to adjust the position of the stop valve, thereby reducing the workload when connecting a pipe and a stop valve. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a side view showing a shovel (excavator) as an example of a construction machine according to an embodiment. [Figure 2] FIG. 2 is a diagram showing an example of the configuration of a hydraulic circuit mounted on the excavator according to the embodiment. [Figure 3] FIG. 3 is a side view showing a configuration relating to a spare hydraulic pipe attached to an arm according to the embodiment. [Figure 4] FIG. 4 is a top view showing a configuration relating to a spare hydraulic pipe attached to an arm according to the embodiment. [Figure 5] FIG. 5 is a perspective view showing the stop valve, the joint member, and the mounting seat according to the embodiment after they have been attached to the side surface of the arm. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment will be described with reference to the drawings.

[0011] [Outline of the Excavator] An overview of a shovel, which is an example of a work machine, will be described. In this embodiment, an example will be described in which a shovel is used as an example of a work machine, but the present invention may be applied to work machines other than shovels (for example, cranes, etc.).

[0012] 1 is a side view showing a shovel (excavator) as an example of a construction machine according to this embodiment. An upper rotating body 3 is rotatably mounted on a lower traveling body 1 of the shovel via a rotating mechanism 2. A boom 4 is attached to the upper rotating body 3. An arm 5 is attached to the tip of the boom 4, and a bucket 6 is attached to the tip of the arm 5 as an end attachment.

[0013] The boom 4, arm 5, and bucket 6 constitute an excavation attachment, which is an example of an attachment, and are hydraulically driven by a boom cylinder 7, an arm cylinder 8, and a bucket cylinder 9, respectively.

[0014] In this embodiment, a bucket 6 is attached to the tip of the arm 5 as an end attachment, but the end attachment may be replaced with something other than the bucket 6. Examples of end attachments include a grapple, a breaker, and a lifting magnet.

[0015] When the end attachment is replaced, it may be necessary to supply working oil (an example of a liquid) to the end attachment. For this reason, in this embodiment, a spare hydraulic pipe is provided to supply working oil to the end attachment.

[0016] The example shown in FIG. 1 shows the left side of the excavator, and therefore includes a stop valve 70L, a steel pipe T1L, a flange 80L, and a hydraulic hose T2L as mechanisms related to spare hydraulic pipes. Although not shown in FIG. 1, the right side of the excavator is also provided with a stop valve 70R, a steel pipe T1R, a flange 80R, and a hydraulic hose T2R (see FIG. 4). These components function as a flow path for supplying work oil when another end attachment is connected. Note that the flanges 80L and 80R may be, for example, split flanges.

[0017] The upper rotating body 3 is provided with a cabin 10 and is equipped with a power source such as an engine 11. Inside the cabin 10, an input device D1, an audio output device D2, a display device D3, a storage device D4, a controller 30, and a machine guidance device 50 are installed.

[0018] The controller 30 is a control device that controls the drive of the shovel. In this embodiment, the controller 30 is configured with an arithmetic processing unit including a CPU and an internal memory. Various functions of the controller 30 are realized by the CPU executing programs stored in the internal memory.

[0019] The machine guidance device 50 is a device that guides the operation of the shovel by the operator. In this embodiment, the machine guidance device 50 guides the operation of the shovel by the operator, for example, by visually and audibly informing the operator of the vertical distance between the surface of the target terrain set by the operator and the position of the tip (toe) of the bucket 6. The machine guidance device 50 may only visually inform the operator of the distance, or may only audibly inform the operator of the distance. Specifically, like the controller 30, the machine guidance device 50 is configured as one of the controllers by an arithmetic processing device including a CPU and internal memory. The various functions of the machine guidance device 50 are realized by the CPU executing programs stored in the internal memory. Alternatively, the machine guidance device 50 may be integrated into the controller 30.

[0020] The input device D1 is a device through which the operator of the excavator inputs various pieces of information. In this embodiment, the input device D1 is a hardware switch attached to the periphery of the display screen of the display device D3. The operator of the excavator inputs various pieces of information to the machine guidance device 50 through the input device D1. The input device D1 may be a touch panel. The input device D1 may also be a USB memory. In this case, the operator can input information stored in the USB memory to the machine guidance device 50 by inserting the USB memory into a USB connector installed in the cabin 10.

[0021] The audio output device D2 is a device that outputs various types of audio information in response to an audio output command from the machine guidance device 50. In this embodiment, an in-vehicle speaker directly connected to the machine guidance device 50 is used. A buzzer may also be used.

[0022] The display device D3 is a device that outputs various types of image information in response to commands from the machine guidance device 50. In this embodiment, an in-vehicle liquid crystal display that is directly connected to the machine guidance device 50 is used.

[0023] The storage device D4 is a device for storing various types of information. In this embodiment, the storage device D4 is a non-volatile storage medium such as a semiconductor memory, and stores various types of information output by the machine guidance device 50 and the like.

[0024] Next, a configuration example of a hydraulic circuit mounted on the excavator of Fig. 1 will be described with reference to Fig. 2. Fig. 2 is a diagram showing a configuration example of a hydraulic circuit mounted on the excavator according to the embodiment. In Fig. 2, high-pressure hydraulic lines, pilot lines, and an electrical control system are indicated by solid lines, dashed lines, and dashed dotted lines, respectively.

[0025] The main pumps 14L and 14R are variable displacement hydraulic pumps driven by the engine 11. In this embodiment, the main pump 14L circulates hydraulic oil to a hydraulic oil tank T through a center bypass oil passage 21L that passes through each of the control valves 171L to 175L that constitute the control valve 17. The main pump 14L can also supply hydraulic oil to each of the control valves 172L to 175L through a parallel oil passage 22L that extends parallel to the center bypass oil passage 21L. Similarly, the main pump 14R circulates hydraulic oil to a hydraulic oil tank T through a center bypass oil passage 21R that passes through each of the control valves 171R to 175R that constitute the control valve 17. The main pump 14R can also supply hydraulic oil to each of the control valves 172R to 175R through a parallel oil passage 22R that extends parallel to the center bypass oil passage 21R. Hereinafter, the main pump 14L and the main pump 14R may be collectively referred to as the "main pump 14." The same applies to the other components that are configured in pairs on the left and right.

[0026] The control valve 171L is a spool valve that switches the flow of hydraulic oil to supply the hydraulic oil discharged from the main pump 14L to the left-side traveling hydraulic motor 1A when the left-side traveling lever is operated.

[0027] The control valve 171R is a spool valve that functions as a straight travel valve. In this embodiment, the straight travel valve 171R is a 4-port 2-position spool valve and has a first valve position and a second valve position. The first valve position has a flow path that connects the main pump 14L and the parallel oil line 22L and a flow path that connects the main pump 14R and the control valve 172R. The second valve position has a flow path that connects the main pump 14R and the parallel oil line 22L and a flow path that connects the main pump 14L and the control valve 172R.

[0028] The control valve 172L is a spool valve that switches the flow of hydraulic oil to supply the hydraulic oil discharged by the main pump 14L to the stop valves 70L and 70R when the opening / closing pedal 26A of the end attachment drive actuator 75 (e.g., a grapple drive cylinder) is operated.

[0029] The auxiliary line 27R is a flow path that connects the control valve 172L and the stop valve 70R. The auxiliary line 27R is made up of a steel pipe T1R, a hydraulic hose T2R, etc. (shown in Figures 3 and 4). The auxiliary line 27L is a flow path that connects the control valve 172L and the stop valve 70L. The auxiliary line 27L is made up of a steel pipe T1L, a hydraulic hose T2L, etc. (shown in Figure 4).

[0030] For example, when the end attachment drive actuator 75 is connected to the stop valves 70L and 70R, the working oil is supplied via the stop valves 70L and 70R.

[0031] The control valve 172R is a spool valve that switches the flow of hydraulic oil to supply the hydraulic oil discharged from the main pump 14 to the right-side traveling hydraulic motor 1B when the right-side traveling lever is operated.

[0032] The control valve 173L is a spool valve that switches the flow of hydraulic oil to supply the hydraulic oil discharged by the main pump 14 to the swing hydraulic motor 2A when the swing operation lever is operated.

[0033] The control valve 173R is a spool valve that switches the flow of hydraulic oil to supply the hydraulic oil discharged by the main pump 14R to the bucket cylinder 9 when the bucket operation lever is operated.

[0034] The control valves 174L and 174R are spool valves that switch the flow of hydraulic oil when the boom operation lever is operated, in order to supply the hydraulic oil discharged by the main pump 14 to the boom cylinder 7. The control valve 174L additionally supplies hydraulic oil to the boom cylinder 7 when the boom operation lever is operated in the boom-raising direction by a predetermined lever operation amount or more.

[0035] The control valves 175L and 175R are spool valves that switch the flow of hydraulic oil when the arm operation lever is operated to supply the hydraulic oil discharged by the main pump 14 to the arm cylinder 8. The control valve 175R additionally supplies hydraulic oil to the arm cylinder 8 when the arm operation lever is operated by a predetermined lever operation amount or more.

[0036] The hydraulic oil flowing out from each of the left-side traveling hydraulic motor 1A, the swing hydraulic motor 2A, and the arm cylinder 8 is discharged into the hydraulic oil tank T through the return oil passage 23L. Similarly, when the end attachment drive actuator 75 is connected to the stop valves 70R, 70L, the hydraulic oil flowing out from the end attachment drive actuator 75 via the stop valves 70R, 70L is discharged into the hydraulic oil tank T through the return oil passage 23L. In addition, the hydraulic oil flowing out from each of the right-side traveling hydraulic motor 1B, the bucket cylinder 9, and the boom cylinder 7 is discharged into the hydraulic oil tank T through the return oil passage 23R. Some of the hydraulic oil flowing out from the arm cylinder 8 may also be discharged into the hydraulic oil tank T through the return oil passage 23R.

[0037] The center bypass oil passages 21L, 21R each include a negative control throttle 20L, 20R between the most downstream control valve 175L, 175R and the hydraulic oil tank T. The negative control throttles 20L, 20R restrict the flow of hydraulic oil discharged from the main pumps 14L, 14R, generating negative control pressure upstream of the negative control throttles 20L, 20R. The controller 30 uses this negative control pressure to perform negative control. Specifically, the lower the negative control pressure generated by the negative control throttles 20L, 20R, the greater the discharge rate of the main pumps 14L, 14R. When the negative control pressure generated by the negative control throttles 20L, 20R exceeds a predetermined pressure, the controller 30 reduces the discharge rate of the main pumps 14L, 14R to a predetermined lower limit.

[0038] The load check valve 51 is a valve that prevents hydraulic oil in the end attachment drive actuator 75 from flowing back into the parallel oil passage 22L when the end attachment drive actuator 75 is connected.

[0039] The opening / closing pedal 26A is one of the operating devices 26, and generates a right pilot pressure (for example, a pilot pressure used when extending the grapple drive cylinder to close the grapple) acting on a right pilot port of the control valve 172L corresponding to the end attachment drive actuator 75, and a left pilot pressure (for example, a pilot pressure used when contracting the grapple drive cylinder to open the grapple) acting on a left pilot port of the control valve 172L. In this embodiment, when the front end side (toe side) is depressed, the right pilot pressure of the control valve 172L is increased to move the control valve 172L to the left, and when the rear end side (heel side) is depressed, the left pilot pressure of the control valve 172L is increased to move the control valve 172L to the right. In addition, when the depression is released, the control valve 172L is returned to the neutral position.

[0040] The pressure reducing valve 55A adjusts the right pilot pressure of the end attachment drive actuator 75 generated by the opening / closing pedal 26A, and adjusts the right pilot pressure according to the magnitude of the control current from the controller 30. Specifically, the pressure reducing valve 55A receives the right pilot pressure of the end attachment drive actuator 75 as a primary pressure, and applies the adjusted pilot pressure to the right pilot port of the control valve 172L as a secondary pressure. The pressure reducing valve 55A reduces the secondary pressure as the control current increases.

[0041] When both the hydraulic actuator associated with the main pump 14L (e.g., the end attachment drive actuator 75) and the hydraulic actuator associated with the main pump 14R (e.g., the boom cylinder 7) are continuously operated with full lever / full pedal, the controller 30 makes the discharge rate L1 of the main pump 14L and the discharge rate L2 of the main pump 14R the same. Hereinafter, this method will be referred to as the "discharge rate synchronization method." Full lever / full pedal means, for example, a state in which the operation amount of the lever / pedal is 80% or more, where the operation amount in the neutral state of the lever / pedal is 0% and the operation amount in the maximum operation state is 100%.

[0042] Next, a description will be given of a spare hydraulic pipe for supplying working oil to the end attachment drive actuator 75 when the end attachment drive actuator 75 for driving the end attachment is attached to the attachment.

[0043] Fig. 3 is a side view showing the configuration relating to the spare hydraulic pipes attached to the arm 5. Fig. 4 is a top view showing the configuration relating to the spare hydraulic pipes attached to the arm 5.

[0044] 3 and 4, the extension direction of the steel pipe T1L attached to the arm 5 is the X-axis, the left-right direction of the arm 5 is the Y-axis, and the height direction perpendicular to the extension direction of the steel pipe T1L is the Z-axis. These coordinate axes are not limited to Figs. 3 and 4, but are similarly applied to Fig. 5.

[0045] In the example shown in Figures 3 and 4, the steel pipe T1R and the hydraulic hose T2R are flange-connected by a flange 80R. The flange 80R according to this embodiment is formed by combining a pair of flanges. The steel pipe T1R is welded to one of the flanges. A screw hole is formed in the other flange, and the hydraulic hose T2R is inserted into the screw hole. Then, by fastening one flange and the other flange with bolts and nuts to form the flange 80R, a flow path for the flow of work oil can be formed between the steel pipe T1R and the hydraulic hose T2R.

[0046] Similarly, on the left side surface of the arm 5, a flange 80L according to this embodiment is formed by combining a pair of flanges. A steel pipe T1L is welded to one of the pair of flanges. A screw hole is formed in the other flange of the flange 80L, and a hydraulic hose T2L is inserted into the screw hole. Then, by fastening one flange and the other flange with bolts and nuts to form the flange 80L, a flow path for the work oil to flow can be formed between the steel pipe T1L and the hydraulic hose T2L.

[0047] The steel pipes T1R and T1L are pipes made of iron, but the material is not limited to iron and may be any other rigid material such as other metals.

[0048] As shown in Figure 4, a portion of steel pipe T1R is fixed to the upper part of arm 5 by fixing members 81R and 82R. Similarly, a portion of steel pipe T1L is also fixed to the upper part of arm 5 by fixing members 81L and 82L. Fixing members 81R and 82R are fixed to a seat formed on the upper surface of arm 5 by fastening bolts SC1R, SC2R, SC3R, and SC4R. Specifically, fixing member 81R is composed of an upper fixing member and a lower fixing member, and is fixed to a seat formed on the upper surface of arm 5 by fastening bolts SC1R and SC2R, while at the same time sandwiching a portion of steel pipe T1R between the upper fixing member and the lower fixing member, thereby positioning steel pipe T1R on arm 5. Similarly, the fixing member 82R is composed of an upper fixing member and a lower fixing member, and is fixed to a seat formed on the upper surface of the arm 5 by fastening bolts SC3R and SC4R, while at the same time positioning the steel pipe T1R on the arm 5 by sandwiching a portion of the steel pipe T1R between the upper fixing member and the lower fixing member.

[0049] Furthermore, fixing members 81L and 82L are fixed to seats formed on the upper surface of arm 5 by fastening bolts SC1L, SC2L, SC3L, and SC4L. Specifically, fixing member 81L is composed of an upper fixing member and a lower fixing member, and is fixed to a seat formed on the upper surface of arm 5 by fastening bolts SC1L and SC2L, while simultaneously sandwiching a portion of steel pipe T1L between the upper and lower fixing members, thereby positioning steel pipe T1L on arm 5. Similarly, fixing member 82L is composed of an upper and lower fixing member, and is fixed to a seat formed on the upper surface of arm 5 by fastening bolts SC3L and SC4L, while simultaneously sandwiching a portion of steel pipe T1L between the upper and lower fixing members, thereby positioning steel pipe T1L on arm 5.

[0050] In this embodiment, by fixing a portion of the steel pipes T1R, T1L to the upper surface of the arm 5, the steel pipes T1R, T1L are prevented from spreading outward in the width direction (Y-axis direction) beyond the arm 5. This prevents the steel pipes T1R, T1L from coming into contact with objects that are close to the arm 5 in the width direction. This is because, even if an object that is close to the arm 5 in the width direction comes into contact with the arm 5, it will come into contact with the side surface of the arm 5 before coming into contact with the steel pipes T1R, T1L. Furthermore, this is because the side surface of the arm 5 prevents an object that has come into contact with the side surface of the arm 5 from coming further close to the steel pipes T1R, T1L.

[0051] As shown in FIG. 4, the steel pipe T1R extends from the flange 80R in the X-axis direction and then bends at a first bent portion B1R toward the outside of the arm 5 (the negative Y-axis direction). The steel pipe T1R then extends further outward (the negative Y-axis direction) than the right side of the arm 5 and then bends at a second bent portion B2R toward the inside of the arm 5 (the positive Y-axis direction) so as to be approximately parallel to the right side of the arm 5. Furthermore, as shown in FIG. 3, the second bent portion B2R of the steel pipe T1R is configured to also bend in the negative Z-axis direction, so that the end of the steel pipe T1R reaches the stop valve 70R attached to the right side of the arm 5. This allows the steel pipe T1R to form a flow path between the flange 80R and the stop valve 70R.

[0052] Similarly, the steel pipe T1L extends from the flange 80L in the X-axis direction and then bends at a first bent portion B1L toward the outside of the arm 5 (positive Y-axis direction). The steel pipe T1L then extends further outward (positive Y-axis direction) than the left side of the arm 5 and then bends at a second bent portion B2L toward the inside of the arm 5 (negative Y-axis direction) so as to be approximately parallel to the left side of the arm 5. Furthermore, because the second bent portion B2L of the steel pipe T1L is configured to bend in the negative Z-axis direction, the end of the steel pipe T1L reaches the stop valve 70L. As a result, the steel pipe T1L forms a flow path between the flange 80L and the stop valve 70L.

[0053] In this way, steel pipes T1R and T1L extending in the longitudinal direction of arm 5 (direction including the X-axis) are partially attached to the upper surface of arm 5 (attachment) and connected to stop valves 70R and 70L provided on the side of arm 5 (attachment). The portion of steel pipe T1R on the right side of arm 5 includes a first bent portion B1R and a second bent portion B2R between the portion attached to the upper surface of arm 5 and stop valve 70R. Similarly, the portion of steel pipe T1L on the left side of arm 5 includes a first bent portion B1L and a second bent portion B2L between the portion attached to the upper surface of arm 5 and stop valve 70L.

[0054] The steel pipes T1R and T1L, which extend in the X-axis direction, are bent in the Y-axis direction and the Z-axis direction. In other words, the steel pipes T1R and T1L have a three-dimensional shape. Because the steel pipes T1R and T1L have the above-mentioned shape, dimensional errors are more likely to occur than in steel pipes with a planar shape. Therefore, the stop valves 70R and 70L according to this embodiment have the following configuration.

[0055] FIG. 5 is a perspective view showing the stop valve 70R according to this embodiment, the joint member P12, and the mounting seat P11 after they have been attached to the side surface of the arm.

[0056] A mounting seat P11 is welded to the side surface of the arm 5. For example, the mounting seat P11 is joined to the side surface of the arm 5 by being welded all around its periphery.

[0057] Two insertion holes H11, H12 are formed in the mounting seat P11 and are substantially parallel to the arm 5. The diameters of the insertion holes H11, H12 are formed to be larger than the diameters of the fastening bolts SC11, SC12 (an example of a first fixing member) to be inserted therethrough. Note that the diameters of the insertion holes H11, H12 according to this embodiment only need to be larger than the diameters of the fastening bolts SC11, SC12 and smaller than the outer diameters of the heads of the fastening bolts SC11, SC12 and the washers W11, W12.

[0058] A passage through which hydraulic oil flows is formed in the valve block 74R. Connection ports are opened at both ends of the passage. In addition, a female thread is provided near the connection ports for fastening a pipe flange (for example, flange 72R) with a fastening bolt.

[0059] The flange 72R, to which the steel pipe T1R is welded, is fastened to one of two connection ports provided in the valve block 74R using four fastening bolts SC31, SC32, SC33, and SC34. In other words, the valve block 74R has a connection port at the location where the steel pipe T1R is fixed by the flange 72R.

[0060] A connection port 73R is provided on the surface of the valve block 74R opposite to the surface to which the flange 72R is fastened. When the end attachment (including the end attachment drive actuator 75) is attached, the flange of a pipe for supplying working oil to the end attachment drive actuator 75 is fastened to the connection port 73R with a fastening bolt or the like. This forms a flow path for working oil from the steel pipe T1R to the end attachment drive actuator 75. Note that if a pipe for supplying working oil to the end attachment drive actuator 75 is not attached, the connection port 73R may be covered with any cover member.

[0061] The adjustment head 71R (an example of an adjustment section) protrudes from the upper surface of the valve block 74R. The adjustment head 71R is integrally formed with a spherical valve body section disposed on the flow path inside the valve block 74R and a valve stem section connecting the valve body section and the adjustment head 71R.

[0062] A valve body is disposed above the passage inside the valve block 74R. A through-hole is formed in the valve body, passing through the center. When the adjustment head 71R is rotated so that the through-hole of the valve body and the passage of the valve block 74R are positioned parallel to each other, oil is permitted to flow through the passage. When the adjustment head 71R is rotated so that the through-hole of the valve body and the passage of the valve block 74R are positioned perpendicular to each other, oil is blocked from flowing through.

[0063] In this way, the stop valve 70R can switch between communicating and blocking the flow path of the work oil (from the backup line 27R) by rotating the adjustment head 71R. For example, if the adjustment head 71R is formed in the shape of a bolt head, the operator can switch the flow path by rotating the adjustment head 71R using a tool such as a wrench.

[0064] The adjusting head 71R protrudes from the upper surface of the valve block 74R. This makes it possible to prevent the adjusting head 71R from coming into contact with an object close to the side of the shovel's arm 5 during shovel operation, compared to when the adjusting head 71R protrudes from the outer surface (right side) of the valve block 74R. This prevents the adjusting head 71R, the valve stem portion, or the valve disc portion from coming into contact with an object, making it difficult to rotate the adjusting head 71R relative to the valve block 74R.

[0065] In this way, the stop valve 70R can switch between communicating and blocking the flow path of the working oil by rotating the adjustment head 71R.

[0066] Two insertion holes H21, H22 are formed in the valve block 74R in a direction approximately perpendicular to the side surface of the arm 5. The diameters of the insertion holes H21, H22 are formed to be larger than the diameters of the fastening bolts SC21, SC22 (an example of a second fixing member) to be inserted therethrough. Note that the diameters of the insertion holes H21, H22 according to this embodiment only need to be larger than the diameters of the fastening bolts SC21, SC22 and smaller than the outer diameters of the heads of the fastening bolts SC21, SC22 and the washers W21, W22.

[0067] The joint member P12 is attached between the mounting seat P11 and the stop valve 70R, and is formed with mounting seat-side threaded holes for fastening the fastening bolts SC11 and SC12, and valve-side threaded holes for fastening the fastening bolts SC21 and SC22. The joint member P12 according to this embodiment is formed as a rectangular parallelepiped. The surface on which the mounting seat-side threaded holes are formed is adjacent to the surface on which the valve-side threaded holes are formed. In this way, the angle between the direction in which the mounting seat-side threaded holes are formed and the direction in which the valve-side threaded holes are formed is 90 degrees.

[0068] The fastening bolts SC11 and SC12 are inserted into insertion holes H11 and H12 formed in the mounting seat P11. The mounting seat P11 is fastened together by the fastening bolts SC11 and SC12, and is fastened and fixed to the joint member P12.

[0069] The diameters of the insertion holes H11, H12 are larger than the diameters of the fastening bolts SC11, SC12. Therefore, when fastening them together, the position of the joint member P12 with respect to the mounting seat P11 can be adjusted in the X-axis and Y-axis directions by the difference between the diameters of the fastening bolts SC11, SC12 and the diameters of the insertion holes H11, H12. This makes it possible to adjust the distance between the side surface of the arm 5 and the joint member P12, in other words, the distance between the side surface of the arm 5 and the stop valve 70R.

[0070] The fastening bolts SC21 and SC22 are inserted into insertion holes H21 and H22 formed in the stop valve 70R. The stop valve 70R is fastened together by the fastening bolts SC21 and SC22 and is fastened and fixed to the joint member P12.

[0071] The diameters of the insertion holes H21, H22 are larger than the diameters of the fastening bolts SC21, SC22. Therefore, the position of the stop valve 70R relative to the joint member P12 can be adjusted in the X-axis and Z-axis directions by the difference between the diameters of the fastening bolts SC21, SC22 and the diameters of the insertion holes H21, H22. In other words, the position of the stop valve 70R can be adjusted in a direction parallel to the side surface of the arm 5.

[0072] That is, in this embodiment, the position of the joint member P12 relative to the mounting seat P11 and the position of the stop valve 70R relative to the joint member P12 are adjustable by providing the above-described configuration. The direction in which the position of the joint member P12 relative to the mounting seat P11 can be adjusted is partially different from the direction in which the position of the stop valves 70R, 70L relative to the joint member P12 can be adjusted. The stop valve 70R is attached to the mounting seat P11 provided on the side surface of the arm 5 via the joint member P12, and is therefore configured so that its position can be adjusted three-dimensionally with the side surface of the arm 5 as a reference.

[0073] In this embodiment, the adjustment head 71R protrudes from the upper surface of the valve block 74R, but the adjustment head 71R may protrude from the lower surface of the valve block 74R. By having the adjustment head 71R protrude from the upper or lower surface of the valve block 74R, it is possible to prevent the adjustment head 71R from coming into contact with an object present to the left or right of the arm 5. For example, if an object close to the arm 5 in the width direction comes into contact with the side surface of the valve block 74R, the object will be prevented from moving further closer to the adjustment head 71R by the side surface of the valve block 74R. Therefore, this configuration can prevent problems such as deformation of the valve disc portion, valve stem portion, or adjustment head 71R due to contact of the adjustment head 71R with an object, making it difficult to switch between communication and blockage of the flow path.

[0074] 5, the stop valve 70R provided on the right side of the arm 5 has been described. The stop valve 70L provided on the left side of the arm 5 has the same configuration, and description thereof will be omitted.

[0075] The insertion holes H21, H22 formed in the stop valve 70R and the insertion holes H11, H12 formed in the mounting seat P11 are not limited to the shapes described above. For example, they may be elongated holes whose diameters are longer in the direction of adjustment.

[0076] Because the steel pipes T1R and T1L according to this embodiment have a three-dimensional shape as described above, it is preferable that the stop valves 70R and 70L connected to the steel pipes T1R and T1L also be three-dimensionally adjustable in position. Therefore, the stop valves 70R and 70L according to this embodiment are attached to the mounting seat P11 via the joint member P12. This allows the stop valves 70R and 70L to be three-dimensionally adjustable in position relative to the side of the arm 5. This facilitates connection between the stop valves 70R and 70L and the steel pipes T1R and T1L. This configuration therefore reduces the workload of the operator in connecting spare pipes for the end attachment with the end attachment drive actuator 75.

[0077] Although the embodiments have been described in detail above, the present disclosure is not limited to such specific embodiments, and various modifications and variations are possible within the scope of the gist described in the claims. [Explanation of symbols]

[0078] 1 Undercarriage 2. Swivel mechanism 3 Upper rotating body 4. Boom 5 Arm 6 buckets 7 Boom cylinder 8 Arm Cylinder 9 Bucket cylinder 10 Cabins 11 Engine 70R, 70L stop valve 71R Adjustment head (example of adjustment part) 72R flange 73R connection port 74R valve block 80R, 80L flange P11 Mounting seat P12 Joint material SC11, SC12 Fastening bolts (examples of first fixing members) SC21, SC22 Fastening bolts (example of second fixing member) T1R, T1L steel pipe (example of pipe) T2R, T2L hydraulic hose H11, H12, H21, H22 insertion holes

Claims

1. a mounting seat provided on an attachment of the work machine; a joint member fixed to the mounting seat by a first fixing member; a stop valve fixed to the joint member by a second fixing member, a position of the joint member relative to the mounting seat and a position of the stop valve relative to the joint member are adjustable, and a direction in which the position of the joint member relative to the mounting seat can be adjusted is partially different from a direction in which the position of the stop valve relative to the joint member can be adjusted; Work machinery.

2. the stop valve further includes an adjustment unit that switches between communication and blocking of the liquid flow path via the stop valve; The adjustment portion protrudes from the upper surface or the lower surface of the stop valve.

2. The work machine according to claim 1.

3. The pipe connected to the connection port of the flow path of the stop valve has a bent portion.

3. The work machine according to claim 2.

4. a part of the pipe is attached to an upper surface of the attachment, an end of the pipe is connected to the stop valve provided on a side surface of the attachment, and the bent portion is present between the part of the pipe attached to the upper surface of the attachment and the end connected to the stop valve; 4. The work machine according to claim 3.

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