JPH0547060U - Locking device for hydraulic switching valve - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Since the switching lever of the prior art hydraulic switching valve is locked to the casing by a bolt member, it can be easily switched by loosening and removing the bolt member. The operation can be performed. Therefore, even if the driver sets the hydraulic switching valve to the standard operation position, another driver may switch the switching without the driver's knowledge, which is dangerous. The present invention aims to solve the above problems. According to the lock device of the present invention, the lever body of the switching lever 40 is formed of a pipe, and a bolt member 44 having a catching hook portion that penetrates through a hole of the lever body is screwed to the casing 37. Further, a threaded pin 46 reaching the hooking portion is screwed in from the tip of the lever main body, and a stopper 49 is attached so that the threaded pin cannot be loosened. Alternatively, through holes are formed in the switching lever side and the bolt member respectively, and the through holes are locked.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lock device for a hydraulic switching valve that is installed in a construction machine such as a hydraulic excavator and that can change the operation system of a remote control lever for work into a limited number of ways.

[0002]

[Prior Art]

 FIG. 6 is a perspective view of an essential part showing the inside of a cab for a hydraulic excavator (not shown). In the figure, 1 is a driver's seat, 2 and 3 are left and right work remote control levers, 4 and 5 are left and right traveling levers, 6 is a hydraulic switching valve, and 7 is a switching switch for switching the hydraulic switching valve 6 to a plurality of positions. It is a lever. FIG. 7 is a front view of the conventional hydraulic switching valve 6 in FIG. 6 as seen from the front side. In the drawing, 8 is a casing of the hydraulic switching valve 6, 9 is a front cover of the casing 8, 10 is a rotary pool, reference numeral 0 is an axial center of the rotary pool 10, 11 is a switching lever 7 with respect to the front cover 9. Bolt members to be locked, Y, K, M, H are positions for switching the switching lever 7, and 12Y, 12K, 12M, 12H are switching levers 7 when switching to positions Y, K, M, H respectively. Is a screw hole into which the bolt member 11 is screwed in to lock. FIG. 8 is a sectional view taken along line AA of FIG. 7. In the figure, 13 is a lever main body of the switching lever 7, and 14 is a pin fixing the base end of the lever main body 13 to the front end of the rotary pool 10.

FIG. 9 is a hydraulic circuit diagram of a main part of a hydraulic excavator equipped with a hydraulic switching valve 6. In the figure, 15, 16, 17, and 18 are various hydraulic actuators, 19, 20 and 21, 22 are pilot switching valves that control various hydraulic actuators, 23L and 23R are left and right traveling direction switching valves, and 24 and 25 are first and second pumps, 26 is an oil tank, 27 to 30 and 31 to 34 are left and right pilot valves, and symbols a, ..., h indicate the operating directions of the left and right remote control levers 2 and 3. .. Note that R1, ..., R8 are input ports of the hydraulic pressure switching valve 6, and C1, ..., C8 are output ports.

There are several domestic manufacturers of hydraulic excavators. Therefore, the operating systems of hydraulic excavators, in particular, the correspondences between the operating directions a, ..., H of the left and right work remote control levers 2, 3 and the various hydraulic actuators operated by them differ from one manufacturer to another. There are four typical operation methods currently in use. Therefore, when operating a hydraulic excavator that is not familiar to the driver, the hydraulic switching valve 6 is switched to prevent an operation error, and a desired position (any one of Y, K, M, and H) is selected. I am trying to do it.

Next, a conventional hydraulic switching valve 6 will be described with reference to FIGS. 6 to 9. Each input port R1 of the hydraulic pressure switching valve 6 is changed by switching to a desired position among a plurality of positions Y 1, K, M, and H by the switching lever 7 connected to the rotary pool 10 inside the hydraulic pressure switching valve 6. , R8 and the output ports C1, ..., C8 can be converted, and after the switching operation of the switching lever 7 is completed, the switching lever 7 is attached to the front cover 9 of the casing 8 by the bolt member 11 It is locked at.

[0006]

[Problems to be solved by the device]

 In the conventional hydraulic switching valve, the switching lever is locked to the front cover of the casing by a bolt member, so the switching operation can be easily performed by loosening and removing the bolt member. You can Therefore, even if the driver sets the hydraulic switching valve to the position of the standard operation method, another person, for example, another driver may change the switching without the driver's knowledge. Therefore, the former driver may inadvertently perform a driving operation after that, and it cannot be said that this is a complete safety measure. An object of the present invention is to provide a lock device for a hydraulic switching valve that can solve the above problems.

[0007]

[Means for Solving the Problems]

 In the present invention, the lever main body of the switching lever, which is connected to the front end of the rotary pool in the hydraulic switching valve in a state orthogonal to the axis of the rotary pool, is formed by a pipe, and the central portion of the lever main body in the longitudinal direction is formed. Through the hole opened perpendicular to the lever body axis, and screw the bolt member to the front cover of the casing.When the bolt member is screwed, the pipe hole of the lever body A retaining hook is formed at the position of the bolt member that matches the position, and a screw hole is formed at the tip of the lever body concentric with the hole center of the pipe hole. Screw in a threaded pin with a length that reaches the retaining hook of the bolt member, and install a stopper so that the screw pin cannot be loosened, and use the hydraulic switching lever of the hydraulic switching valve as standard. After the switch setting to work position was constructed so that it can not be removed operation of the fastener is in addition to using the fastener desorption special tool.

Further, a switching lever connected to the front end of the rotary pool in the hydraulic switching valve in a state orthogonal to the axial center of the rotary pool, and in the vicinity of the central portion of the switching lever in a state orthogonal to the axial center of the lever body. The pipe is fixed, the pipe is projected forward, and the bolt member is screwed to the front cover of the casing through the pipe hole, and when the bolt member is screwed, the pipe is fixed. A through hole is formed that penetrates the bolt and the bolt member in a direction perpendicular to the axial direction of the bolt and the switch lever of the hydraulic switching valve is set to the standard operation position, and then the through hole is locked.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view of an essential part showing a lock device 35 according to claim 1 of the present invention. In the figure, 36 is a hydraulic switching valve, 37 is a casing of the hydraulic switching valve 36, 38 is a front cover of the casing 37, 39 is a rotary pool, 40 is a switching lever, 41 is a lever main body of the switching lever 40, and 42 is a lever. A hole opened in the main body 41, 43 is a screw hole formed in the inner diameter of the tip of the lever main body 41, 44 is a bolt member, 45 is a hooking hole which is a hooking portion for preventing the bolt member 44 from coming off, and 46 is a screw pin. Reference numeral 47 is a spanner hooking portion when the screwed pin 46 is screwed in, 48 is a collar for hiding the spanner hooking portion 47 inside, and 49 is a stopper which is a stopper fitting so that the collar 48 does not come off the screwed pin 46. It's a ring. FIG. 2 is a front view seen from B of FIG. FIG. 3 is a front view of the threaded pin 46 in FIG. In the figure, 50 is a threaded portion of the threaded pin 46, and 51 is a stop ring fitting groove.

Next, the configuration of the lock device 35 according to claim 1 of the present invention will be described with reference to FIGS. 1 to 3. A lever main body 41 of a switching lever 40, which is connected to the front end of the rotary pool 39 inside the hydraulic switching valve 36 in a state orthogonal to the axis of the rotary pool 39, is formed of a pipe, and the lever main body 41 has a center in the longitudinal direction. Part of the lever main body 41, the bolt member 44 is screwed to the front cover 38 by penetrating through the hole 42 opened orthogonally to the axis of the lever body 41. When the bolt member 44 is screwed, A hook hole 45 for retaining is formed in a portion of the bolt member 44 which coincides with a position of the pipe hole a (reference numeral a in FIG. 1) of the main body 41, and a pipe hole (a) hole is formed at a tip portion of the lever main body 41. A screw hole 43 is formed concentrically with the core, and a threaded pin 46 having a length whose distal end reaches the retaining hole 45 of the bolt member 44 is screwed into the screw hole 43, and the screw is further screwed into the screw hole 43. With It fitted a collar 48 on the outer peripheral side of the wrench engagement portion 47 so that it can not loosen the emissions 46. Then, a stop ring 49 is attached so that the collar 48 does not come off, and the switching lever 40 of the hydraulic switching valve 36 is moved to the standard operation position (position of the operation method positions Y, K, M, H set to the standard operation method). It is configured so that the stop ring 49 can be removed only after using the special tool for attaching / detaching the stop ring after switching the setting.

FIG. 4 is a cross-sectional view of essential parts showing a bolt member 44 'and a threaded pin 46' of another embodiment in the lock device 35 according to claim 1 of the present invention. A groove 52 is formed as a retaining hook on the outer periphery of the bolt member 44 ', and the tip of the threaded pin 46' is engaged with the groove 52.

Next, the operation of the lock device 35 according to claim 1 of the present invention will be described. When locking the locking device 35, the switching lever 40 is switched to the standard operation position, and the bolt member 44 is screwed into the front cover 38 through the hole 42 of the lever body 41. In this case, the hole center of the retaining hole 45 for retaining the bolt member is the same as that of the pipe hole a of the lever body 41 in the same direction. Then, the threaded pin 46 is inserted into the pipe hole a of the lever body 41, and the threaded portion 50 of the threaded pin 46 is screwed into the threaded hole 43 at the tip of the lever body 41. In this case, by rotating the wrench hook portion 47 of the threaded pin 46 with a wrench, the threaded portion 50 is screwed into the tip end portion of the lever body 41, but the tip end portion of the threaded pin 46 is fitted into the hook hole 45 of the bolt member 44. It is inserted. Then, the collar 48 is attached to the top of the lever body 41 so as to cover the spanner hook portion 47, and finally, a stop ring 49 is attached using a stop ring attachment / detachment tool (not shown). Fit in the groove 51. The lock device 35 is locked as shown in FIG. 1 by the above operation, but the stop ring attachment / detachment tool used for this lock operation is not included in a general ordinary spare tool. Therefore, when the specific responsible manager or driver stores this special tool for attaching and detaching the stop ring, it is impossible for others to remove the stop ring 49. Therefore, since the bolt member 44 cannot be loosened and removed by another driver, the hydraulic pressure switching valve 36 is reliably maintained in the standard operation position, and safety can be ensured.

Next, FIG. 5 is a cross-sectional view of essential parts showing a lock device 53 according to claim 2 of the present invention. In the figure, the same components as those of the lock device 35 of claim 1 are designated by the same reference numerals. 54 is a switching lever, 55 is a lever main body of the switching lever 54, 56 is a pipe fixed to the lever main body 55, 57 is a through hole opened in the pipe 56, 58 is a bolt member, and 59 is a bolt member 58. The through hole 60 is a lock. Next, the configuration of the lock device 53 according to claim 2 of the present invention will be described with reference to FIG. The switching lever 54 connected to the front end of the rotary pool 39 inside the hydraulic pressure switching valve 36 in a state orthogonal to the axial center of the rotary pool 39 has a lever main body shaft near the central portion of the lever body 55 of the switching lever 54. The pipe 56 is fixed in a state orthogonal to the center, the pipe 56 is projected forward, and the bolt member 58 is screwed to the front cover 38 of the casing 37 through the pipe hole. When the bolt member 58 is screwed onto the pipe 56 and the bolt member 58, through holes 57 and 59 penetrating the pipe 56 and the bolt member 58 in a direction perpendicular to the axial direction thereof are opened, and the switching lever 54 of the hydraulic switching valve 36 is opened. After switching to the standard operation position (which is the position set in the standard operation method among the operation method positions Y, K, M, and H), set it to the through holes 57 and 59. The lock 60 was locked.

Next, the operation of the lock device 53 according to claim 2 of the present invention will be described. When locking the locking device 53, the switching lever 54 is switched to the standard operation position, and the bolt member 58 is screwed to the front cover 38 through the pipe hole of the pipe 56 fixedly mounted on the lever body 55. .. In this case, the through hole 57 of the pipe 56 and the through hole 59 of the bolt member 58 are aligned in the same direction. Then, the lock 60 is locked in the through holes 57 and 59. By the above operation, the lock device 53 is locked as shown in FIG. 5, but the key (not shown) of the lock 60 is stored by a manager or a driver who has a specific responsibility. Therefore, since another person, for example, another driver cannot unlock it, the hydraulic switching valve 36 is reliably maintained in the standard operation position, and safety can be ensured.

[0015]

[Effect of the device]

 In the conventional hydraulic switching valve, the switching lever is locked to the front cover of the casing by a bolt member, so the switching operation can be easily performed by loosening and removing the bolt member. You can Therefore, even if the driver sets the hydraulic switching valve to the position of the standard operation method, another person, for example, another driver may change the switching without the driver's knowledge. Therefore, the former driver may inadvertently perform a driving operation after that, and it cannot be said that this is a complete safety measure. However, in the lock device of the present invention, the lever main body of the switching lever, which is connected to the front end of the rotary pool in the hydraulic switching valve in a state orthogonal to the axis of the rotary spool, is formed of a pipe, and the lever main body The bolt member is screwed to the front cover of the casing by penetrating through a hole opened in the vicinity of the center of the lever body so that the bolt member is screwed to the front cover of the casing. A retaining hook is formed at the bolt member that matches the position of the pipe hole, and a screw hole is formed at the tip of the lever body concentric with the hole center of the pipe hole. A screw pin having a length that reaches the retaining hook of the bolt member is screwed in, and a fastener is attached so that the screw pin cannot be further loosened. The tool for attaching / detaching the fastener used for the above locking operation is not included in general ordinary spare tools. Therefore, if this specific tool for attaching and detaching the fasteners is stored by a manager or driver who has a specific responsibility, it is impossible for others to remove the fasteners. Therefore, since the bolt member cannot be loosened and removed by another driver, the hydraulic switching valve is reliably maintained in the standard operating position, and safety can be ensured.

Further, in another lock device of the present invention, a switching lever connected to the front end of the rotary pool inside the hydraulic switching valve in a state orthogonal to the axial center of the rotary pool, near the center of the switching lever. Fix the pipe in the direction orthogonal to the axis of the lever body, project the pipe forward, and screw the bolt member to the front cover of the casing through the pipe hole. When the member is screwed, a through hole that penetrates the pipe and the bolt member in the direction perpendicular to the axial direction of the member is opened, and the switching lever of the hydraulic switching valve is set to the standard operation position. I tried to lock it in the hole. The lock key used for the above lock operation should be stored by a responsible manager or driver. Therefore, the hydraulic switching valve can be reliably maintained in the standard operating position, and safety can be ensured, because it cannot be unlocked by another driver, for example, by another driver.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing a lock device according to claim 1 of the present invention.

FIG. 2 is a front view seen from B of FIG.

3 is a front view of the threaded pin in FIG. 1. FIG.

FIG. 4 is a cross-sectional view of essential parts showing a bolt member according to another embodiment of the present invention.

FIG. 5 is a cross-sectional view of essential parts showing a lock device according to claim 2 of the present invention.

FIG. 6 is a perspective view of an essential part showing the inside of the cab for the hydraulic excavator.

FIG. 7 is a front view of a conventional hydraulic switching valve seen from the front side.

8 is a cross-sectional view taken along the line AA of FIG.

FIG. 9 is a hydraulic circuit diagram of a main part of a hydraulic excavator equipped with a hydraulic switching valve.

[Explanation of symbols]

 2,3 Remote control lever 6,36 Hydraulic switching valve 7,40,54 Switching lever 8,37 Casing 9,38 Front cover 10,39 Rotary pool 11,44,44 ', 58 Bolt member 13,41,55 Lever body 35,53 Lock device 46,46 'Threaded pin 49 Stop ring 56 Pipe 60 Lock

Claims (2)

[Scope of utility model registration request] 1. A plurality of pilot switching valves for controlling the operation of various hydraulic actuators mounted on a construction machine, a required number of pilot valves corresponding to pilot ports of each pilot switching valve, and operating these pilot valves. A plurality of remote control levers and one operation type hydraulic switching valve for connecting the pilot port of each pilot switching valve and each pilot valve are arranged, and the switching lever connected to the rotary pool inside the hydraulic switching valve is arranged. Then, the connection between the input port and the output port of the hydraulic switching valve can be converted by switching to the desired position among the multiple positions. A hydraulic switching valve that is locked to the front of the rotary pool inside the hydraulic switching valve. A lever main body of a switching lever, which is connected to the end of the rotary pool in a state orthogonal to the axial center of the rotary pool, is formed of a pipe, and the lever main body is opened in a state orthogonal to the axial center of the lever main body in the vicinity of the center in the longitudinal direction. Through the hole,
The bolt member is screwed to the front cover of the casing, and when the bolt member is screwed, a retaining hook is formed at a portion of the bolt member that matches the position of the pipe hole of the lever body, In addition, a screw hole is formed at the tip of the lever body concentric with the hole center of the pipe hole, and a threaded pin with a length that allows the tip to reach the retaining hook of the bolt member is screwed into the screw hole. , Further, install a stopper so that the screwed pin cannot be loosened,
A locking device for a hydraulic switching valve, characterized in that after the switching lever of the hydraulic switching valve has been set to the standard operation position, the locking bracket can only be removed by using a tool for attaching and detaching the locking bracket. .. 2. A plurality of pilot switching valves for controlling the operation of various hydraulic actuators equipped on a construction machine, a required number of pilot valves corresponding to the pilot ports of each pilot switching valve, and operating these pilot valves. A plurality of remote control levers and one operation type hydraulic switching valve for connecting the pilot port of each pilot switching valve and each pilot valve are arranged, and the switching lever connected to the rotary pool inside the hydraulic switching valve is arranged. Then, the connection between the input port and the output port of the hydraulic switching valve can be converted by switching to the desired position among the multiple positions. A hydraulic switching valve that is locked to the front of the rotary pool inside the hydraulic switching valve. For the switching lever that is connected at the end in a state orthogonal to the axis of the rotary pool, a pipe is fixed near the center of the switching lever in a state orthogonal to the axis of the lever body, and the pipe is directed forward. So that the bolt member is screwed to the front cover of the casing through the pipe hole, and when the bolt member is screwed, the pipe and the bolt member are placed in the direction perpendicular to the axial direction. A lock device for a hydraulic switching valve, wherein a through hole passing through is opened, a switching lever of the hydraulic switching valve is switched to a standard operation position, and then the through hole is locked.