JP2000283105A - Accelerating valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a valve block of an accelerating valve, to reduce a cost of the valve block, and to reduce the number of oil leak generation positions. SOLUTION: In this accelerating valve, a pilot pressure passage 10 for leading a pilot pressure performing pilot control of a cartridge type pilot check valve 9 penetrates a counter balance valve installation hole 2a installed with a counter balance valve 7, and communicates with a pilot check valve installation hole 2c installed with the pilot check valve 9. Thereby, a longitudinal hole or transverse hole constituting the pilot pressure passage 10 is not required beside the counter balance valve installation hole 2a or the pilot check valve installation hole 2c, so that a valve block 2 can be thinned by just that much to reduce a hole machining cost and surface machining cost. Reduction of the number of blockade positions by plugs reduces the number of oil leak generation positions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a speed increasing valve mounted on an opening / closing cylinder used for opening / closing a nibble for dismantling a concrete structure such as a building.
More specifically, the present invention belongs to the technical field of a speed increasing valve capable of reducing the size and cost of a valve block and reducing the locations where oil leaks occur.

[0002]

2. Description of the Related Art As is well known, when a concrete structure such as a building is dismantled, it is called a nibble which is attached to the tip of an undulating and bendable working arm of a hydraulic shovel body and has crushable teeth which can be opened and closed. A crush attachment is used. An opening / closing cylinder, which is a hydraulically operated actuator, is used to open and close the crushing teeth of such a crushing attachment. The opening / closing cylinder, which is a hydraulically operated actuator, communicates with a bottom pressure chamber and a rod-side pressure chamber of the opening / closing cylinder through a directional switching valve. The pressure oil supply / discharge conduit communicates via a block-shaped speed increasing valve which is detachably fixed to a cylinder tube of the opening / closing cylinder and has a configuration described later.

The structure of the speed increasing valve according to the conventional example will be described below with reference to FIG. 4 of a pressure oil flow system diagram and FIG. 5A of an external view of the structure as viewed from the side of attachment to an opening / closing cylinder. 5 (a)
5 (b) as viewed in the direction indicated by the arrow G in FIG. 5, and FIG. 5 (c) as a cross-sectional view taken along the line HH in FIG. 5 (b) showing a state where the cartridge type counterbalance valve, check valve and pilot type check valve are removed. ) And FIG. 6 in a sectional view taken along the line II of FIG.
(A) and FIG. 6 (b) of a cross-sectional view taken along line JJ of FIG. 5 (c).
FIG. 6C in a sectional view taken along the line KK in FIG.
Description will be made with reference to FIG.

[0004] Reference numeral 1 shown in these figures designates a block-shaped speed increasing valve. A valve block 2 of the speed increasing valve 1 has a first inlet through which hydraulic oil switched by a direction control valve 14 flows in and out. A port 3 and a second inlet port 4 are provided, and a first outlet port 5 for supplying hydraulic oil to a rod-side pressure chamber 15a of the opening / closing cylinder 15 and a hydraulic oil to a bottom-side pressure chamber 15b of the opening / closing cylinder 15. A second outlet port 6 for feeding is provided.

The first inlet port 3 and the first outlet port 5
Is connected to the first flow path 11 through a cartridge type counterbalance valve 7 incorporated in a counterbalance valve installation hole 2a provided in the valve block 2, and communicates with the second inlet port 4 and the second outlet. The port 6 is in communication with the second channel 12. The first flow path 11 between the counterbalance valve 7 and the first outlet port 5 and the second flow path 12 are provided with a cartridge type built in a check valve mounting hole 2 b provided in the valve block 2. Through a communication flow path 13 through a check valve 8 and a cartridge-type pilot check valve 9 which is also installed in a pilot check valve installation hole 2c provided in the valve block 2. The check valve 8 is provided on the first flow path 11 side, and the pilot check valve 9 is provided on the second flow path 12 side. Each of them is arranged in such a direction as to prevent the flow of the pressure oil from the second flow path 12 side to the first flow path 11 side.

The pilot control of the pilot type check valve 9 is performed by branching between the first inlet port 3 of the first flow path 11 and the counterbalance valve 7 and connecting the pilot pressure line 10 with the pilot type check valve 9. This is configured to be performed by the hydraulic pressure on the first flow path 11 side guided through. And this pilot pressure line 1
0 is a valve block that can avoid the counterbalance valve mounting hole 2a, the check valve mounting hole 2b, and the pilot check valve mounting hole 2c, as is well understood from FIGS. The valve block 2 is configured to communicate with a plurality of vertical holes and horizontal holes provided in the valve block 2 vertically and horizontally. Further, the opening of each of the plurality of vertical holes and horizontal holes provided vertically and horizontally in the valve block 2 is closed by a plug.

[0007] The branch from the pilot type check valve 9 and the second flow path 12 in the communication flow path 13 and communicating with the counterbalance valve 7 is connected to the rod side pressure chamber 15a of the opening / closing cylinder 15 from the rod side pressure chamber 15a. A first pilot pressure passage 7a for guiding a pilot pressure to open the valve body of the counterbalance valve 7 in order to return the hydraulic oil to the directional control valve 14, and a first inlet port 3 of the first flow passage 11 and a counter. The valve branching from the balance valve 7 and communicating with the counterbalance valve 7 supplies hydraulic oil from the direction control valve 14 to the rod-side pressure chamber 15a of the opening / closing cylinder 15 via a check valve. And a second pilot pressure path 7b for closing the valve body.

[0008]

The speed-up valve 1 according to the prior art described above has no functional problem at all, and can sufficiently exhibit its function. . However, as described above, the pilot pressure passage 10 for pilot-controlling the pilot-type check valve 9 is provided with a valve block capable of avoiding the counterbalance valve installation hole 2a, the check valve installation hole 2b, and the pilot check valve installation hole 2c. Since the valve block 2 of the speed-increasing valve 1 must be large (large) due to passing through the position inside 2, the inertia force due to the impact force due to opening and closing when operating the opening and closing cylinder is large. Since the pitch and diameter between the mounting bolts must be increased, the valve block 2 becomes larger and larger, and a plurality of vertical holes 10a and horizontal holes 1a constituting the pilot pressure passage 10 are formed.
0b must be opened in the valve block 2, so that there is an economic problem that the speed-up valve 1 becomes expensive.

Further, as described above, the speed increasing valve 1
Pressure line 10 provided in the valve block 2
Inevitably, the number of plugs that close the openings of the plurality of vertical holes 10a and the horizontal holes 10b constituting the hole increases, so that the probability of occurrence of oil leakage increases, and there is also a problem to be solved that oil leakage may occur. there were.

[0010] Accordingly, an object of the present invention is to provide a speed-increasing valve capable of reducing the size and cost of a valve block and reducing the number of locations where oil leaks occur.

[0011]

In order to solve the above-mentioned problems, the means adopted by the speed increasing valve according to the first aspect of the present invention is to increase the pressure from one of the first inlet ports through which the pressure oil flows in to the actuator. A cartridge type counterbalance valve is incorporated in the first flow path communicating with the first outlet port for supplying oil, and pressure is applied to the actuator from the counterbalance valve of the first flow path and the other second inlet port through which pressure oil flows in and out. A second flow path communicating with a second outlet port for supplying oil,
A cartridge-type check valve, and a cartridge-type pilot-type check valve that is controlled to open and close by a pilot pressure via a pilot pressure path branched from between the first outflow / inflow port and the counterbalance valve are sequentially arranged from the first flow path side. And a block-shaped speed increasing valve in which a communication flow path incorporated in a direction for preventing inflow of pressure oil from the second flow path side to the first flow path side communicates, wherein the pilot pressure path includes the counter The pilot-type check valve may be connected to a pilot-type check valve mounting hole in which the pilot-type check valve is mounted through a counterbalance valve mounting hole in which the balance valve is mounted.

According to the speed increasing valve according to the first aspect,
Pilot pressure path for guiding the pilot pressure for pilot-controlling the cartridge-type pilot-type check valve passes through the counterbalance valve mounting hole in which the counterbalance valve is mounted, and the pilot-type check valve assembly in which the pilot-type check valve is mounted Through a position in the valve block that communicates with the inlet hole and can avoid the counterbalance valve assembling hole, check valve assembling hole, and pilot check valve assembling hole as in the conventional speed increasing valve. Since the valve block of the speed increasing valve can be made thinner, the number of conical holes constituting the pilot pressure passage formed vertically and horizontally in the valve block can be reduced, so that the opening is closed. The number of plugs is small.

According to a second aspect of the present invention, there is provided a speed increasing valve according to the first aspect, wherein the first outlet port and the second outlet port are connected to a pressure oil inlet / outlet port of the actuator. And an opening on the same surface side of the valve block as opposed to a block mounting surface to which the valve block is fixed.

According to the speed increasing valve according to the second aspect,
The first outlet port and the second outlet port can be connected to the actuator simply by fixing the valve block by aligning the surfaces on which the first outlet port and the second outlet port are open with the block mounting surface, and through a hose or a tube. Therefore, the valve block of the speed increasing valve can be made more compact.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a speed increasing valve according to an embodiment of the present invention will be described with reference to FIG. Figure 1 in perspective
(B), FIG. 1 (c) of a sectional view taken along the line BB of FIG. 1 (b) showing a state where a cartridge type counterbalance valve, a check valve and a pilot type check valve are removed, and FIG. 1 (c). 2 (a) and FIG. 1 (c), which are cross-sectional views taken along line CC of FIG.
FIG. 2B of a cross-sectional view taken along the line DD of FIG.
FIG. 2 (c) is a sectional view taken along the line, FIG. 2 (d) is a sectional view taken along the line FF in FIG. 1 (c), and FIG. 3 (a) is a view showing the state of attachment to the opening / closing cylinder. FIG. 3 showing a view from arrow M in FIG.
This will be described with reference to FIG.

However, the present embodiment is different from the above-mentioned conventional example only in that the passage position in the valve block of the pilot pressure passage for guiding the pilot pressure for pilot-controlling the pilot type check valve is different. Since the configuration other than the pressure oil flow path system is completely the same as that of the speed increasing valve according to the conventional example, the same components are denoted by the same reference numerals and different points will be described below.

FIG. 2 relating to the speed increasing valve 1 of the present embodiment.
(A) to (d) and FIGS.
As is well understood in comparison with (a) to (d), the pilot pressure line 10 for guiding the pilot pressure for pilot-controlling the pilot-type check valve 9 is provided with a counterbalance valve in which the counterbalance valve 7 is incorporated. Hole 2
a and communicates with the pilot-type check valve mounting hole 2c in which the pilot-type check valve 9 is mounted.

That is, the vertical hole and the horizontal hole constituting the pilot pressure line 10 are not provided on the side of the counterbalance valve mounting hole 2a or the pilot check valve mounting hole 2c, and the vertical hole and the horizontal hole of the first pilot pressure line 7a are formed. Only the side hole is provided on one side of the counterbalance valve mounting hole 2a or the pilot check valve mounting hole 2c.

By the way, the cartridge type check valve 8
The corresponding position of the pilot pressure line 10 on the outer periphery of the valve and the corresponding position of the pilot pressure line 10 on the outer periphery of the pilot type check valve 9 are from one side to the other side of the check valve mounting hole 2b and the pilot type check valve mounting hole 2c. An oil groove (not shown) for guiding hydraulic oil is provided in the periphery. Conversely, the same function can be expected even if an oil groove is provided around the inner circumference of the check valve mounting hole 2b or the pilot check valve mounting hole 2c. However, in this case, there is a slight disadvantage in terms of processing cost.

Therefore, the speed increasing valve 1 according to the present embodiment
According to the valve block 2 of the prior art, no vertical hole or horizontal hole constituting the pilot pressure passage 10 is provided at all on the other side of the counterbalance valve mounting hole 2a or the pilot type check valve mounting hole 2c. The thickness can be made thinner than the valve block of the speed increasing valve according to the above, and the drilling cost and the surface processing cost of the valve block 2 can be reduced correspondingly, and the opening of the vertical hole or the horizontal hole can be reduced accordingly. Since the number of plugs is reduced due to the reduction in the number of parts, an extremely excellent effect that the risk of oil leakage is surely reduced can be achieved.

Further, as shown in FIG. 1A, the first outlet port 5 and the second outlet port 6 of the speed increasing valve 1
The pressure oil inlet / outlet port of the opening / closing cylinder 15 is opened, and is opened on the same surface side of the valve block as the valve mounting surface to which the valve block of the speed increasing valve 1 is fixed.

Therefore, this speed increasing valve 1
As shown in (a) and (b), the first outlet port 5 and the second outlet port 6 are simply fixed to the block mounting surface of the opening / closing cylinder 15 where the pressure oil inlet / outlet port is opened. The second outlet port 6 can be communicated with the opening / closing cylinder 15, and the valve block of the speed increasing valve 1 can be made more compact because it is not configured to communicate through a hose or a tube connected to the side surface.

Incidentally, the thickness of the valve block of the speed increasing valve according to the conventional example was 132 mm, but the thickness of the valve block of the speed increasing valve according to the present embodiment was 105 mm.
Thus, the thickness could be reduced by a little over 20% as compared with the conventional case.

In the above description, the case where the speed increasing valve is applied to an opening / closing cylinder for opening / closing the nibble has been described as an example. However, the present invention can be applied to various cylinders. The invention is not limited to an opening / closing cylinder for opening and closing.

[0025]

As described above, according to the speed increasing valve according to the first aspect of the present invention, the pilot pressure passage for guiding the pilot pressure for pilot-controlling the pilot type check valve has a check valve in which the check valve is incorporated. The pilot check valve is inserted through the valve installation hole and communicates with the pilot check valve installation hole, and the counterbalance valve installation hole, check valve installation hole, pilot check Since the valve block does not pass through a position in the valve block that can avoid the valve assembling hole, the valve block can be made thinner, so that the weight is reduced, and a plurality of pilot pressure passages formed vertically and horizontally in the valve block are formed. Since the number of drilled holes can be reduced, cost can be reduced, and the number of plugs that block the openings of multiple drilled holes can be reduced, which may cause oil leakage. An excellent effect that less can be expected.

According to the speed-increasing valve according to the second aspect of the present invention, the first outlet can be fixed only by fixing the valve block so that the surfaces on which the first outlet port and the second outlet port are opened coincide with the block mounting surface. Since the port and the second outlet port can be connected to the actuator and are not connected via a hose or tube, the valve block of the speed increasing valve can be made more compact, greatly contributing to the weight reduction of the actuator. can do.

[Brief description of the drawings]

FIG. 1A is an external view of a speed-increasing valve as viewed from a side mounted on an opening / closing cylinder according to an embodiment of the present invention.
FIG. 1B is a view taken in the direction of arrow A in FIG. 1A, and FIG. 1C is a view showing a state in which a cartridge type counterbalance valve, a check valve and a pilot check valve are removed.
It is a BB sectional view taken on the line of (b).

FIG. 2A shows an embodiment of the present invention, and FIG.
2C is a cross-sectional view taken along a line CC, FIG. 2B is a cross-sectional view taken along a line DD in FIG. 1C, and FIG. 2C is a cross-sectional view taken along a line EE in FIG. FIG. 2D is a sectional view taken along line FF of FIG. 1C.

FIG. 3A is a view showing a state in which a speed increasing valve is mounted on an opening / closing cylinder according to the embodiment of the present invention;
FIG. 3B is a view as viewed in the direction of the arrow M in FIG.

FIG. 4 is a pressure oil flow path diagram of a speed increasing valve according to a conventional example.

5 (a) is an external view of a speed-increasing valve as viewed from a side mounted on an opening / closing cylinder, and FIG. 5 (b) is a view taken in the direction of an arrow G in FIG. 5 (a). FIG. 5C shows a state in which a cartridge type counterbalance valve, a check valve, and a pilot type check valve are removed.
It is a line sectional view.

FIG. 6 (a) is a diagram illustrating a conventional example, and FIG.
FIG. 6B is a cross-sectional view taken along the line JJ of FIG. 5C, FIG. 6C is a cross-sectional view taken along the line KK of FIG.
FIG. 5D is a sectional view taken along line LL of FIG.

[Explanation of symbols]

1 ... speed-up valve, 2 ... valve block, 2a ... counterbalance valve installation hole, 2b ... check valve installation hole, 2c ...
Pilot type check valve installation hole, 3… First inlet port,
4 ... second inlet port, 5 ... first outlet port, 6 ... second outlet port, 7 ... counter balance valve, 7a ... first pilot pressure path, 7b ... second pilot pressure path, 8 ... check valve, 9 ... Pilot type check valve 10: pilot pressure path, 10a: vertical hole, 10b: horizontal hole,
11 ... first flow path, 12 ... second flow path, 13 ... communication flow path, 1
4: Directional control valve, 15: Open / close cylinder. 15a: rod-side pressure chamber, 15b: bottom-side pressure chamber

Continued on front page F-term (reference) 2D003 AA01 AB04 CA02 DA03 3H051 BB01 BB10 CC17 FF07 3H089 BB27 DB08 DB33 DB46 DB49 GG02 HH05 HH16 JJ02

Claims (2)

[Claims] A cartridge type counterbalance valve is incorporated in a first flow path communicating with a first outlet port for supplying pressure oil to an actuator from one of a first inlet port through which pressure oil flows in and out. A counterbalance valve and a second flow path communicating with a second outlet port for supplying pressure oil to the actuator from the other second inlet port through which pressure oil flows in and out, the cartridge type check valve; A cartridge-type pilot check valve that is opened and closed by a pilot pressure through a pilot pressure passage branched from a port and a counterbalance valve; and a first flow passage from the second flow passage side and a first flow passage from the second flow passage side. In a block-shaped speed increasing valve in which a communication flow path incorporated in a direction for preventing inflow of pressure oil to a road side communicates, the pilot pressure path is A speed-increasing valve characterized in that it penetrates a counterbalance valve mounting hole in which the counterbalance valve is mounted and communicates with a pilot-type check valve mounting hole in which the pilot-type check valve is mounted. 2. The actuator according to claim 2, wherein the first outlet port and the second outlet port are open at a pressure oil inlet / outlet port of the actuator,
2. The speed increasing valve according to claim 1, wherein the valve block is opened on the same surface side of the valve block as opposed to a block mounting surface to which the valve block is fixed.