JPH0742810U - Block device for piping connection of pilot circuit - Google Patents

Abstract

(57) [Abstract] [Purpose] In a conventional hydraulic excavator, various connecting fittings such as T-connecting fittings are made into a branch shape and a potato joint type with respect to a merging block provided in the middle of a hydraulic pilot circuit It is connected. Therefore, the workability at the time of assembling is poor and the assembling cost is high, and the space occupancy near the block is large, which hinders the layout of various devices. This problem is solved. [Construction] In the block device of the pilot circuit of the present invention, screw holes for screwing pipe connecting fittings are drilled on the front, rear, left and right side parts of the block, and an oil passage communicating with the screw holes is formed inside the block. The upper surface and the lower surface of the block are set as mating surfaces, and a vertical oil passage that communicates with the oil passage inside the block and that communicates from the upper surface to the lower surface of the block is opened, and the block is formed according to the required number of pipes. Was formed by stacking a single piece or a plurality of pieces.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a block device for connecting a piping of a hydraulic pilot circuit equipped in a construction machine such as a hydraulic excavator or a work vehicle.

[0002]

[Prior art]

 FIG. 7 is a perspective view of essential parts showing a piping state of a pilot circuit of the hydraulic excavator. In the figure, 1L and 1R are operation levers for work provided on the front left and right of a driver's seat (not shown) of a hydraulic excavator, and 2L and 2R are work levers operated by the operation levers 1L and 1R. Hydraulic remote control valves 3L, 3R are left and right running pedals provided in front of the driver's seat, 4L, 4R are running hydraulic remote control valves operated by the running pedals 3L, 3R, and 5 are provided in the pilot circuit. Block 6 is a large number of pipes for the pilot circuit. FIG. 8 is a plan view showing the block 5 and various connecting fittings connected to the block 5 in the C portion of FIG. 7. In the figure, 7, 7, and 12 are connecting fittings for the pipe 6, respectively. Reference symbol T is a tank communication port of each of the connection fittings 7, 8 and 9, and reference symbol P is a pilot pressure distribution port of each of the connection fittings 10, 11 and 12. FIG. 9 is a main part hydraulic circuit diagram of the pilot circuit shown in FIG. 7. In the figure, 13 is an oil tank, 14 is a pilot pump which is a pilot pressure hydraulic source, 15, ..., 18 are pilot valves in the hydraulic remote control valve 2L, and 19, ..., 22 are pilot valves in the hydraulic remote control valve 2R. , 23 and 24 are pilot valves in the hydraulic remote control valve 4L, and 25 and 26 are pilot valves in the hydraulic remote control valve 4R.

Conventionally, in a pilot circuit of a hydraulic excavator, a pilot pressure oil that acts on a pilot switching valve (not shown) and return oil from a pilot port such as the pilot switching valve are supplied to a block 5 and a block 5 thereof. The connection fittings 10 to 12, 12, 7 to 9 are connected to each other to join them.

[0004]

[Problems to be solved by the device]

 In a conventional pilot circuit for a hydraulic excavator, various connecting fittings such as a T-connecting fitting are connected to each other in a branching manner in a potato joint type to a merging block provided in the pilot circuit. As a result, workability during assembly was poor and assembly costs were high. Also, when the hydraulic actuator is added to the hydraulic excavator, the pilot piping must be blocked, but in that case, another block is newly added and the block and the original block are connected by the piping. Or, a new fitting was installed in the middle of the pipe. Therefore, as mentioned above, the space occupancy near the block was large, which also hindered the layout of various equipment inside the hydraulic excavator. Further, since various connecting fittings are connected to the block in a branch shape, there is a risk of oil leakage due to vibration of the hydraulic excavator or vibration of the hydraulic piping, and inspection and repair work is difficult and maintenance is poor. An object of the present invention is to provide a pipe connecting block device that can solve the above problems.

[0005]

[Means for Solving the Problems]

 In the block device of the present invention, the pilot pressure from the pilot pressure hydraulic source is applied to the pilot port on the left or right of the pilot switching valve for controlling various hydraulic actuators to switch the pilot switching valve. In addition, the return oil from the pilot port on the opposite side of the operated pilot port is returned to the oil tank through the block. A threaded hole for screwing a pipe connection fitting is drilled in the section, an oil passage communicating with the threaded hole is formed inside the block, and the upper and lower surfaces of the block are set as mating surfaces. Open a vertical oil passage that communicates with the above-mentioned internal oil passage and that communicates from the upper surface to the lower surface of the block, and select one or more blocks depending on the required number of pipes Pieces superposed were configured by forming an upper surface side and lower surface side of the superimposed blocks oil-tight. Also, in the above case, a bolt hole is formed in the block to attach the block to the fixed part of the machine body, the bolt is inserted into the bolt hole, the overlapped block is tightened with the bolt, and the block is attached to the machine body. I fixed it. Alternatively, a board was provided on the bottom surface of the block, the board was attached to the machine, and the blocks that were overlapped were tightened with tie bolts.

[0006]

[Action]

 In the block device of the present invention, the number of blocks to be overlapped is selected according to the required number of pipes in the pilot circuit, and one set of pipes is connected to the screw holes formed in the front, rear, left and right side parts of each block. It can be connected via metal fittings. Therefore, it is possible to dispense with the various branch-shaped connecting fittings around the block of the prior art. Further, since the mounting bolt holes are formed in the block, when the block is mounted on the fixed portion of the machine body, the tightening of the superposed blocks can be securely held and the block can be easily attached to and detached from the machine body. Also, if the board is provided on the bottom of the block, the block can be stably attached with short bolts.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of an essential part showing an embodiment of a block device of the present invention. In the figure, 27, 28 and 29 are blocks, 30 is a top plate, 31 is a tie bolt that is integrally formed with the top plate 30 and connects the blocks 27, 28 and 29, 32 is a substrate, and 33 is a machine body (shown in the figure). Not shown), mounting bolts 34, ..., 37 are connection fittings, 38, ..., 46 are return oil pipes, and 47 is a blind plug. FIG. 2 is a front view showing a block device according to a first embodiment of the present invention. In the figure, 48 and 48 are a plurality of blocks, 49 are screw holes for screwing connection fittings formed on the front, rear, left and right side portions of the block 48, 50 is an oil passage formed inside the block 48, and 51 is a top plate. , 52 is a lower surface plate, 53 is one port integrally formed with the upper surface plate 51, 54 is a bolt for tightening, 55 is a mating surface of the upper surface plate 51, the blocks 48, 48, and the lower surface plate 52. An O-ring 56 is an O-ring provided between the top plate 51 and the tie bolt 53. FIG. 3 is a plan view of the block 48 in FIG. In the figure, 57 is a vertical oil passage, 58 is a slot for fitting the O-ring 55, and 59 is a bolt hole for the bolt 54. FIG. 4 is a front view of the block 48 seen from A in FIG. FIG. 5 is a cross-sectional view of the block 48 taken along the line BB of FIG.

Next, the configuration of the block device of the first embodiment of the present invention will be described with reference to FIGS. In the present invention, screw holes 49 for screwing pipe connecting fittings are formed on the front, rear, left and right side portions of the block 48, and an oil passage 50 communicating with the screw hole 49 is formed inside the block 48. The upper surface and the lower surface of the block 48 are set as a mating surface, and a vertical oil passage 57 that communicates with the oil passage 50 inside the block 48 and that communicates from the upper surface to the lower surface of the block 48 is opened. According to the above, a single block or a plurality of blocks 48 are superposed, and an upper surface plate 51 is attached to the upper end surface side of the superposed blocks 48, 48, and a lower surface plate 52 is attached to the lower end surface side in an oiltight manner. In the above case, a bolt hole 59 is formed in the block 48 in order to attach the block 48 to the fixed portion of the machine body, the bolt 54 is inserted into the bolt hole 59, and the block 48 overlapped with the bolt 54 is inserted. At the same time as tightening, the block 48 was fixed to the machine body.

Next, the operation of the block device of the first embodiment of the present invention will be described. In the present invention, the number of blocks 48 to be overlapped can be selected according to the required number of pipes of the pilot circuit, and the pipes can be connected to the screw holes 49 of each block 48 through a set of connection fittings. . Therefore, it is possible to eliminate the need for various branch-shaped connecting fittings around the block 5 (shown in FIG. 7) of the prior art. Further, since the bolt holes 59 for mounting are formed in the block 48, when the block 48 is mounted on the fixed portion of the machine body, the tightening of the overlapped blocks 48, 48 is surely held and the block 48 is easily attached to and detached from the machine body. Can be

In the present invention, the O-ring 55 is provided as a seal member on each mating surface of the upper plate 51, the blocks 48, 48, and the lower plate 52, but the O-ring 55 is not limited to the other packing ( A seal member such as a liquid packing) may be provided. Although the block 48 has a quadrangular shape in plan view, the shape is not limited to a quadrangle and may be a polygon, a circle, or the like. If it is made polygonal or circular, the pipes can be connected in blocks according to the direction of the pipes, so the appearance will be good.

Next, FIG. 6 is a front view showing a block device according to a second embodiment of the present invention. In the figure, 48 'and 48' are a plurality of blocks, 49 is a screw hole for screwing connecting metal fittings formed on the front, rear, left and right side surfaces of the block 48 ', and 50 is an oil formed inside the block 48'. Reference numeral 30 is a top plate, 31 'is a tie bolt integrally formed with the top plate 30 to connect the blocks 48' and 48 ', 32 is a substrate, and 53 is formed to position the blocks 48' and 48 '. There is a spigot, 33 is a mounting bolt, and 55 'is an O-ring. Next, the construction and operation of the block device of the second embodiment of the present invention will be described with reference to FIG. In the present invention, a board 32 is provided on the bottom surface of the superposed blocks 48 'and 48', and the board 32 is attached to the machine body by a bolt 33. Further, the superposed blocks 48 ', 48' are attached to a tie bolt 31 '. I tried to tighten it with. As a result, the block 48 'can be stably attached with the short bolt 33. The shape of the block 48 'in plan view may be a polygonal shape, a circular shape, etc. as described in the case of the block device of the first embodiment.

[0012]

[Effect of device]

 In a conventional pilot circuit for a hydraulic excavator, various connecting fittings such as a T-connecting fitting are connected to each other in a branching manner in a potato joint type to a merging block provided in the pilot circuit. Therefore, the workability at the time of assembly is poor and the assembly cost is high, and the space occupancy near the block is large, which hinders the layout of various devices. However, in the block device of the present invention, screw holes for screwing pipe connecting fittings are drilled on the front, rear, left, and right side surfaces of the block, and an oil passage communicating with the screw hole is formed inside the block. The upper and lower surfaces of the block are set as mating surfaces, and a vertical oil passage that communicates with the above-mentioned oil passage inside the block and that communicates from the top surface to the bottom surface of the block is opened, and a single block is installed according to the required number of pipes. Or, a plurality of layers are superposed, and the upper end surface side and the lower end surface side of the superposed blocks are formed oil-tight. In addition, in the above case, a bolt hole is formed in the block to attach the block to the fixed part of the machine body, a bolt is inserted into the bolt hole, the overlapped block is tightened with the bolt, and the block is attached to the machine body. I fixed it. Alternatively, a board was provided on the bottom of the block so that the board could be attached to the machine body, and the stacked blocks could be tightened with tie bolts. Therefore, in the block device of the present invention, the number of blocks to be overlapped is selected according to the required number of pipes in the pilot circuit, and the pipes are connected to the screw holes formed in the front, rear, left and right side parts of each block respectively. It can be connected via a set of fittings. Therefore, it is possible to dispense with the various branch-shaped connecting fittings around the block of the prior art. Further, since the mounting bolt holes are formed in the block, when the block is mounted on the fixed portion of the machine body, the tightening of the superposed blocks can be securely held and the block can be easily attached to and detached from the machine body. Also, if the board is provided on the bottom of the block, the block can be stably attached with short bolts. Therefore, in the hydraulic excavator equipped with the block device of the present invention, the workability at the time of assembly can be improved and the assembly cost can be reduced, and the space margin around the block can be increased, so that the layout of various equipment inside the hydraulic excavator can be increased. You can improve your sexuality. Also, maintenance work such as inspection and repair around the block can be easily performed.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing a state of an embodiment of a block device of the present invention.

FIG. 2 is a front view showing a block device according to a first embodiment of the present invention.

FIG. 3 is a plan view of a block in FIG.

FIG. 4 is a front view of the block seen from A in FIG.

FIG. 5 is a cross-sectional view of the block seen from BB of FIG.

FIG. 6 is a front view showing a block device according to a second embodiment of the present invention.

FIG. 7 is a perspective view of a main part showing a piping state of a pilot circuit according to a conventional technique.

FIG. 8 is a plan view showing a block in a C portion of FIG. 7 and its periphery.

9 is a main part hydraulic circuit diagram of the pilot circuit shown in FIG. 7. FIG.

[Explanation of symbols]

 5,27-29,48,48 'Block 6,38-46 Piping 7-12,34-37 Connection fitting 13 Oil tank 14 Pilot pump 30,51 Top plate 31,31' Tie bolt 32 Substrate 33,54 Bolt 49 Screw Hole 50 Oil passage 52 Bottom plate 55, 56 O-ring 57 Vertical direction Oil passage

Claims (3)

[Scope of utility model registration request] 1. A pilot pressure from a pilot pressure hydraulic source is applied to a pilot port on the left or right of a pilot switching valve for controlling various hydraulic actuators so that the pilot switching valve is switched and operated. The return oil from the pilot port on the opposite side is returned to the oil tank via the block.In the pipe connection block of the pilot circuit of the construction machine, screws for attaching pipe connection fittings are attached to the front, rear, left and right side parts of the block. A hole is bored, an oil passage communicating with the screw hole is formed inside the block, the upper surface and the lower surface of the block are set as mating surfaces, and the upper surface of the block that communicates with the oil passage inside the block is formed. To open the vertical direction oil passage leading to the lower surface, and stack one or more blocks according to the required number of pipes. A pipe connection block device for a pilot circuit, characterized in that the upper end side and the lower end side of the superposed blocks are oil-tightly formed. 2. A pilot circuit pipe connecting block device according to claim 1, wherein a bolt hole is formed in the block for attaching the block to a fixed portion of the machine body, and the bolt is attached to the bolt hole. A block device for piping connection of a pilot circuit, characterized in that the block is inserted and tightened with the bolts, and the block is fixed to the machine body. 3. The block device for piping connection of a pilot circuit according to claim 1, wherein the board is provided on the bottom surface of the block, the board is attached to the machine body, and the blocks are superposed. A block device for piping connection in a pilot circuit, characterized in that it is tightened with tie bolts.