JP4935301B2 - Hydraulic pipe pressure release device and hydraulic pipe structure - Google Patents

Abstract

A depressurization block (8) is provided lying over a plurality of hydraulic pipes (3 and 4). The depressurization block (8) is provided with main passages to which the pipes (3 and 4) are connected, depressurization valves (10) for removing oil on the inside of the pipes by an opening operation from the exterior, and a drain passage for joining and guiding the oil removed from the depressurization valves (10), and the oil in all the pipes (3 and 4) is all removed to the exterior. An opening operation is performed to operation elements of the depressurization valves (10) at the same time by a push plate having protrusions and the operation elements are held in an opening state.

Description

  The present invention relates to a pressure relief device for releasing pressure in a hydraulic pipe provided in a working machine such as a crusher or a dismantling machine, and a hydraulic pipe structure with a pressure release device.

  For example, the boom constituting the long attachment of the dismantling machine is configured to be disassembled into a plurality of short unit booms in consideration of the disassembly and transportability of the machine. The hydraulic piping provided on the boom is also divided into unit piping for each unit boom, and is connected / separated by a joint provided at each end.

  In addition, the joint is usually a hermetic coupler (called a quick coupler, self-sealing coupling, etc.) that has the feature that there is almost no oil leakage when attaching and detaching in addition to being detachable with one touch. Is simply referred to as a coupler). This coupler has a configuration in which a male and female joint is coupled to a counterpart joint and the valve is opened by a coupling operation force.

  However, when a sealed joint represented by this coupler is used, the pipe may be separated into unit pipes while leaving the internal pressure.

  Further, for example, as a result of the unit pipe being left outside in the disconnected state, the temperature of the oil trapped in the pipe rises and expands due to an increase in the outside air temperature, and the pressure in the pipe may increase.

  Furthermore, even when the pressure is not standing, when the unit pipes are connected to each other, the filled oil may become a resistance and prevent the valve opening operation of the joint.

  For this reason, piping connection work at the time of assembly of the machine becomes troublesome or impossible.

  Conventionally, as a countermeasure against this point, as shown in Patent Document 1, a pressure relief valve is provided at the end of each pipe (including the case where it is provided at a joint), and the pressure relief valve is operated by operating a push button of the pressure relief valve. A technique for releasing pressure has been proposed.

Patent Document 2 discloses a technique for extracting oil from each pipe at once by joining the pipes to a merging pipe line via a check valve and opening the merging pipe line by operating one stop valve. It is disclosed.
JP 2001-208221 A Japanese Patent No. 3294550

  However, if a pressure relief valve is provided for each pipe as in the known technique described in Patent Document 1 and pressure (oil) is taken for each pressure relief valve, the work efficiency of pressure relief is poor.

  To solve this problem, the applicant, as Japanese Patent Application No. 2005-049402, provided a single pressure relief pipe connected to the tank, and connected each pressure relief valve and the pressure relief pipe with a hose in order to release the pressure. Proposed technique to do. However, even with this technique, the efficiency of the depressurization operation is still poor because the hose must be changed for each pipe.

  On the other hand, according to the technique of Patent Document 2, high pressure is always concentrated on one stop valve, and when the valve is broken, the high pressure oil in all the pipes flows all at once and the hydraulic actuators become inoperable all at once. A situation such as operation on the dangerous side occurs due to the disconnection, which is dangerous.

  Therefore, the present invention provides a pressure relief device and a hydraulic piping structure for hydraulic piping that can drain oil from a plurality of pipings at the same time and that do not have a risk as in the known technique of Patent Document 2.

The invention of claim 1 (hydraulic piping depressurization apparatus) includes a depressurizing block, and the depressurizing block includes a plurality of main passages to which a plurality of hydraulic piping is connected, and a manual opening operation from the outside. A pressure relief valve that drains the oil in the hydraulic piping through each main passage and a drain passage that joins the oil drawn from each pressure relief valve and leads to the outside are provided . An operating element that is operated to open the drain port and includes a plurality of operating parts that simultaneously press and operate all the operating elements is provided. The pressure release block is configured so as to be held in the pressed operation state .

According to a second aspect of the present invention, in the configuration of the first aspect, the operation body is configured such that the operation portion is provided on the back surface and can be held on the pressure release block in a non-operated state of being reversed. .

The invention of claim 3 is the structure of claim 2, said operating body is one was attached et via a hinge to the depressurization block so as to reversed rotated.

According to a fourth aspect of the present invention, in the configuration of the second or third aspect, the front and back surfaces of the operating body are color-coded .

According to a fifth aspect of the present invention (hydraulic piping structure) , the depressurizing block of the depressurizing device according to any one of the first to fourth aspects is provided across a plurality of hydraulic piping, Each hydraulic pipe is connected to the main passage, and by opening the pressure release valve, the oil in the hydraulic pipe is collectively discharged to the outside through the main passage and the drain passage .

According to the pressure relief device (Claims 1 to 4 ) and the hydraulic piping structure (Claim 5 ) of the present invention, a plurality of main passages in which a plurality of hydraulic pipes are connected to the pressure relief block, and manual opening from the outside Since a pressure relief valve that drains oil from the main passage by operation and a drain passage that joins the oil removed from the pressure relief valve and leads to the outside are provided, the oil in a plurality of pipes can be drained all at once. For this reason, compared with the case where the pressure relief work is performed for each pipe including the known technique of Patent Document 1, the work efficiency of the pressure relief can be significantly improved.

  In addition, since each pipe is individually opened and closed with a pressure relief valve, there is no risk of oil leakage in all the pipes due to damage of one valve as in the known technique of Patent Document 2.

In this case, since it is possible to simultaneously open operate all depressurization valves by Misao Sakutai, work efficiency becomes better.

Moreover, since capable of retaining steering Sakutai the operating state, when a configuration of recovering pulled oil into the oil pan, the valve opening (depressurization) operation and remove the 1 workers recovery operations of oil It can be carried out.

Further, according to the second to fourth aspects of the present invention, it is possible to determine whether the pressure relief valve is in the open state or the closed state based on the front and back surfaces of the operation plate, so that there is little possibility that the operation is started in the open state.

In this case, according to the invention of claim 3 in which the operating body is rotatably attached to the pressure release block via a hinge, the switching between the operating state and the non-operating state of the operating body is simplified. According to the invention of claim 4 , since the front and back surfaces of the operating body are color-coded, the open state and the closed state of the pressure relief valve can be reliably determined at a glance .

1st Embodiment (refer FIGS. 1-7)
FIG. 1 shows two unit booms 1 and 2 among a plurality of unit booms constituting a boom of a long attachment of a dismantling machine, and a plurality (five in the illustrated example) of unit hydraulic pipes 3 provided on these unit booms. .., 4..., And when the booms are assembled, the unit booms 1 and 2 are connected, and at the same time, the corresponding unit hydraulic pipes 3, 4... Are connected to each other (male joint and female joint) 5. , 6...

  In addition, the hydraulic pipe configured by connecting all unit hydraulic pipes is composed of a plurality of hydraulic pressures provided at the base end on a hydraulic pump and a tank installed in a base machine (not shown) and at the tip end on an attachment including a boom. Each is connected to an actuator.

  In both unit booms 1, 2, a pressure release device 7 is provided across unit hydraulic pipes (hereinafter simply referred to as pipes) 3.

  The configuration of the pressure release device 7 is shown in detail in FIG.

  The apparatus 7 includes a rectangular pressure release block 8.

  As shown in FIGS. 5 to 7, the pressure release block 8 has a plurality of main passages 9 to which the pipes 3 and 4 are individually connected, and the oil in the pipes by the manual opening operation from the outside. There are provided a pressure relief valve 10 that is drained through the passages 9 and a drain passage 11 that joins oils that have been drained from the pressure relief valves 10 to guide them to the outside.

  The drain passage 11 is provided so as to penetrate the main passage 9 in a direction perpendicular to the main passage 9, that is, in the longitudinal direction of the pressure release block 8, and the drain joint 12 is connected to the other end side in a state where one end side is closed (see FIGS. Is connected.

  A drain hose 13 is connected to the drain joint 12, and drain oil is collected in the oil receiver 14. Alternatively, the drain pipe 15 can be connected to the drain joint 12 and the drain oil can be returned to the tank through the drain pipe 15.

  The configuration of the pressure relief valve 10 is shown in detail in Patent Document 1.

  That is, as shown in FIGS. 6 and 7, the pressure relief valve 10 includes a valve body 16 disposed in the center portion, and an operating element fitted on the valve body 16 from above so as to be slidable in the vertical direction. 17, a bottomed cylindrical valve case 18 that surrounds the valve body 16 and the operating element 17 from the outer peripheral side, and a coil spring 19 that constantly biases the operating element 17 upward. And is attached to the block 8 by being screwed into the valve mounting hole 20.

  A communication hole 21 communicating with the main passage 9 is provided on the bottom surface of the valve mounting hole 20, and the communication hole 21 is provided in a vertical hole 22 provided in the central portion of the valve body 16 and an upper portion of the vertical hole 22. A lateral hole 23, a circumferential groove 24 provided on the inner periphery of the operating element 17, a gap 25 formed between the contact surfaces of the valve element 16 and the operating element 17 in communication with the peripheral groove, An oil chamber 26 formed between the valve cases 18 and a drain port 27 provided in a bowl shape in the valve case 18 so as to communicate with the oil chamber 26 and communicate with the drain passage 11 of the pressure release block 8. It is configured as follows.

  The gap 25 is closed by the seal 28 as shown in FIG. 6 when the operating element 17 is raised (valve closed state), and when the operating element 17 is pushed down from the top and lowered, the seal 28 is shown in FIG. Open from the door. That is, the pressure relief valve 10 is opened.

  Accordingly, after the two unit booms 1 and 2 are connected, when the pipes 3 are connected to each other, the internal pressures of the pipes 3 to 4 are pushed by pressing the operation elements 17 of the pressure relief valves 10. Alternatively, the filled oil can be extracted from the drain port 27 of the pressure relief valve 10 to the drain passage 11 and discharged collectively.

  On the other hand, a push plate 29 shown in FIGS. 2 to 4, 6 and 7 is used as an operating body for manually opening the operating element 17 from the outside.

  On the back surface of the push plate 29, projections 30 as operation parts for individually pushing the operation elements 17 of the pressure relief valve 10 are arranged in parallel with the same interval as that of the operation elements 17. 7, the pressing plate 29 is put on the pressure release block 8 from above, so that all the operating elements 17 of the pressure release valve 10 are simultaneously pressed by the projections 30.

  On the other hand, the pressure relief block 8 is covered with a cover 31 for protecting the pressure relief valve 10 and improving the appearance as shown in FIGS. 1 to 4, and as shown in FIG. Are held on the upper surface of the cover 31 by screws 32. As a result, the pressure relief valves 10 are held in the valve open state (operation state).

  As shown in FIG. 4, the push plate 29 is screwed to the cover 31 with the projection 30 exposed to the front side, except when the pressure is released. It can be determined from the outside that.

  That is, it is possible to prevent a trouble that oil starts by mistakenly while the pressure relief valves 10 are open and the oil flows out.

  Further, in order to make the front and back (operation state and non-operation state) of the push plate 29 easier to distinguish, both front and back surfaces of the push plate 29 are colored with different colors. In order to show the color classification of the front and back, the push plate 29 in an inverted state is hatched in FIG.

  In this way, the pressure relief block 8 is provided across the pipes 3 in the unit booms 1 and 2, and the main passage 9 to which the pipes 3 to 4 are connected to the pressure release block 8. A pressure relief valve 10 for draining oil from the main passage 9 by an opening operation from the outside, and a drain passage 11 for collecting the oil drained to the drain port 27 of the pressure relief valve 10 and leading it to the outside, Since the oil of each of the pipes 3, 4,... Is extracted at a time when the boom is assembled, the work efficiency of pressure release can be remarkably improved as compared with the case where the pressure release work is performed for each pipe.

  Moreover, since the pipes 3... 4 are individually opened and closed by the pressure relief valves 10..., There is no risk of oil leakage from all the pipes due to valve breakage as in the known technique of Patent Document 2.

  Moreover, according to this embodiment, there exist the following effects.

  (I) Since all the pressure relief valves 10 can be opened simultaneously by the push plate 29, the work efficiency of the pressure relief is further improved.

  (II) Since the push plate 29 can be held in an operating state, it is not necessary for an operator to hold the pressure relief valve 10 in an open state after opening the pressure relief valve 10. That is, one worker can perform the valve opening operation and the recovered oil recovery operation.

Second embodiment (see FIG. 8)
Only differences from the first embodiment will be described.

  In the first embodiment, the push plate 29 is screwed to the pressure release block 8 (cover 31) in the operated state and the non-operated state, whereas in the second embodiment, the push plate 29 is fixed to the pressure release block 8. It is attached to the (cover 31) by a hinge 33 so that it can be rotated (reversed front and back).

  According to this configuration, the operation state and non-operation state of the push plate 29 can be easily switched.

  The second embodiment is the same as the first embodiment in that it is desirable to color-code both the front and back surfaces of the pressing plate 29.

Reference form (see Figs. 9 and 10)
In both the first and second embodiments, the operation is started while the push plate 29 is operated to open all the pressure relief valves 10 simultaneously and the pressure relief valves 10 are opened. In contrast, the pressure release valve 10 is operated separately one by one in the reference form, and only the interlock function is provided by the interlock plate 34 as an interlock dedicated member. It is configured to ensure.

  That is, each pressure release valve 10 is provided with an elongated knob 10a as an operator on the upper surface side, and is configured to be opened and closed by rotating the knob 10a. Specifically, for example, in the pressure relief valve 10 shown in FIG. 6, the operation element 17 is rotatably provided, the knob 10 a is attached to the upper surface thereof, and a side hole-like passage is provided on the side wall facing the valve body 16. A structure in which this passage is communicated / blocked with respect to the lateral hole 23 of the valve body 16 by the rotation of the child 17 can be adopted.

  On the other hand, a plurality of projections 35 are provided on the back surface of the interlock plate 34 at the same intervals as the knobs 10a.

  The projections 35 are made up of a pair of projecting pieces 35a, 35a arranged in parallel at a distance, and only when the knob 10a is in the closed position, as shown in FIG. 10 (a), the projecting pieces 35a. , 35a, the knob 10a is fitted.

  In other words, when the knob 10a is in the open state, as shown in FIG. 10 (b), the knob 10a interferes with both the projecting pieces 35a and 35a and cannot be inserted between them, and the interlock plate 34 is depressurized. The block 8 (cover 31) cannot be normally covered and cannot be screwed.

  Accordingly, it is clearly shown that the pressure relief valves 10 are in an open state when the interlock plate 34 cannot be normally mounted, and thus the interlock function is reliably performed.

  The interlock plate 34 may be attached to the pressure release block 8 (cover 31) so as to be rotatable by a hinge as in the second embodiment instead of screwing.

Specific structure of another embodiment (1) depressurization valves 10 may be variously modified in addition to those exemplified in the above embodiments, short, the main path of the pushing operation of the operation element thus depressurization block 8 Any structure may be used as long as 9 communicates with the drain passage 11 .

( 2) The present invention is not limited to a dismantling machine, and various types of work attachments such as a scrap loader that transports waste and the like can be assembled and disassembled by a plurality of attachment pieces, and hydraulic piping is provided on the work attachment. Can be widely applied to work machines.

  In addition, the present invention is not limited to work attachments, and can be applied to a part that has a configuration in which a hydraulic pipe is divided into a plurality of unit pipes and connected by joints in a work machine.

1 is a perspective view of a pressure relief device according to a first embodiment of the present invention and a boom of a work attachment to which the pressure release device is attached. It is a perspective view of a pressure release apparatus. It is a perspective view of the state which opened and operated the pressure release valve of the pressure release apparatus. It is a perspective view of the state which attached the press plate of the pressure release apparatus to the pressure release block in the reverse state. It is a horizontal sectional view of a pressure release device. It is the VI-VI line expanded sectional view of FIG. FIG. 7 is a view corresponding to FIG. 6 in a valve open state. It is a perspective view of the pressure release apparatus concerning 2nd Embodiment of this invention. It is a perspective view of the pressure release apparatus concerning the reference form of this invention. (A) (b) is a figure which shows the relationship between the interlock plate and the knob of a pressure relief valve in both the valve opening state and valve closing state of the apparatus.

8 Pressure relief block 9 Main passage 10 Pressure relief valve 11 Pressure relief valve drain passage 16 Same valve body 17 Same operation element 18 Same valve case 19 Same coil spring 20 Same valve mounting hole 21 Same communication hole 22 Same vertical hole 23 Same horizontal hole 24 Same groove 25 Same gap 26 Same oil chamber 27 Same drain port 28 Same seal 29 Push plate (operating body)
30 Protrusion (operation part)
33 hinges

Claims (5)

A pressure relief block is provided. In this pressure relief block, there are a plurality of main passages to which a plurality of hydraulic pipes are connected, and a pressure release that drains oil in the hydraulic pipes through each main passage by manual opening operation from the outside. A valve and a drain passage that joins the oil extracted from each pressure release valve and leads to the outside, and each pressure release valve is provided with an operator that is pushed from the outside to open the drain port, and all The operation body is provided with a plurality of operation sections that simultaneously push and operate the operation elements, and the operation body can be held in the pressure release block in an operation state in which all the operation elements are pushed by the operation section. A pressure relief device for hydraulic piping, characterized in that it is configured as described above . 2. The depressurizing apparatus for hydraulic piping according to claim 1 , wherein the operating body is provided with the operating portion on the back surface and configured to be held by the depressurizing block in a non-operated state of being reversed . The operating body, depressurization system for a hydraulic pipe according to claim 2, wherein the mounting et a via a hinge to the depressurization block so as to reversed rotated. 4. The depressurizing device for hydraulic piping according to claim 2 , wherein the front and back surfaces of the operating body are color-coded . The pressure relief block of the pressure relief device according to any one of claims 1 to 4 is provided across a plurality of hydraulic pipes, and each hydraulic pipe is connected to a main passage of the pressure relief block, A hydraulic piping structure characterized in that the valve is operated to open and the oil in the hydraulic piping is collectively discharged to the outside through a main passage and a drain passage .

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