JP3115535B2 - Distribution junction valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution / collection valve having both functions of a flow dividing valve and a flow collecting valve and used for synchronizing two hydraulic actuators.

[0002]

2. Description of the Related Art A flow dividing valve is a flow control valve having a function of dividing a flow to two hydraulic lines having different pressures at a fixed ratio, and a flow collecting valve is a two-way hydraulic line having different pressures. This is a flow control valve having a function of collecting the flow rate from the air at a constant ratio.

The distribution / collection valve is a flow control valve having both functions of the above-mentioned flow dividing valve and the flow collecting valve, and divides a flow to two hydraulic lines having different pressures at a constant ratio. It has a function of collecting flow rates from two hydraulic pipelines having different pressures at a constant ratio.

[0004] The ratio of split and converge is 1: 1, ie
Two equal-sized hydraulic actuators having the same size are used for the two hydraulic actuators of the same size by using equal distribution / collection valves in which the flow rates at the time of branching to the two hydraulic lines and the flow at the time of collecting from the two hydraulic lines are respectively equal. If the same amount of pressure oil is sent, the two hydraulic actuators operate at the same speed, and if the two hydraulic actuators converge by equal amounts, the hydraulic actuators return at the same speed. Movement can be synchronized.

Conventionally, as shown in FIG. 9, an equal distribution / collection valve has been used. This distribution / collection valve 31
A cylindrical main spool 33 which is slidably fitted in the body 32 in the axial direction (left and right directions in the figure) by a predetermined distance;
Main springs 34A and 34B provided on the left and right sides of the main spool 33 to bias the main spool 33 to maintain the neutral position, and are slidably inserted in the left and right sides of the main spool 33 by a predetermined distance in the axial direction. Cylindrical sub-spools 35A, 35B.

A supply port P for hydraulic oil is provided at the center of the body 32, and service ports A and B to the actuator are provided on the left and right.
Is provided. Sub-spool throttles 36A, 36B are provided on the side surfaces of the sub-spools 35A, 35B. Are provided with fixed apertures 38A and 38B. An oil passage 39 for communicating the inside of the main spool 33 with the supply port P is provided on a central side surface of the main spool 33, and is separated from the left and right side surfaces of the main spool 33 by a predetermined distance in the axial direction. Main spool throttles 40A ₁ and 40A ₂ for communicating the sub-spool throttle 36A and the service port A, and main spool throttles 40B ₁ and 40B ₂ for communicating the sub-spool throttle 36B and the service port B. ing.

In the distribution / collection valve 31, the sub spool 3
5A and 35B move left and right by the force of the flow of pressure oil,
The main spool 33 moves left and right due to the pressure difference between the left and right oil chambers 41A and 41B, and the main spool throttle 40A
_1, 40A _2, 40B _1, to adjust the opening of 40B _2.

The distribution / collection valves 31 are provided, for example, on both the left and right sides of a vehicle-mounted crane, and are used for synchronizing jack cylinders 20A and 20B for jacking up the vehicle-mounted crane horizontally.

The extension-side oil chambers of the jack cylinders 20A and 20B and the reduction-side oil chambers of the jack cylinders 20A and 20B are connected to a hydraulic pump 22 and a tank 23 via a switching valve 21, respectively. In order to perform the operation, the extension-side oil chambers of the jack cylinders 20A and 20B are connected to the switching valve 21.
And a distribution collecting valve 1 is provided.

As shown in FIG. 9, when there is a step on the ground 24 on which the left and right jack cylinders 20A, 20B are installed, the switching valve 21 is switched as it is, and the jack cylinders 20A, 20B are switched via the distribution / collection valve 1. When extended,
The pressure oil discharged from the hydraulic pump 22 is divided into equal amounts by the distribution / collection valve 1 and supplied to the extension-side oil chambers of the jack cylinders 20A and 20B.
20B is simultaneously extended by the same amount, and the vehicle-mounted crane is set at an angle.

Therefore, in order to jack up the vehicle-mounted crane horizontally when there is such a step, first, an operating pipeline and a switching valve for individually expanding and contracting the jack cylinder 20A and the jack cylinder 20B, respectively. (Not shown), the jack cylinder 20A and the jack cylinder 20B are respectively extended, and the lower ends thereof are grounded as shown in FIG.

Next, when the switching valve 21 is switched as shown in FIG. 11, the pressure oil discharged from the hydraulic pump 22 flows into the supply port P of the distribution / collection valve 31, and the sub-spool 35A Move 35B to the right. Therefore sub spool aperture 36A communicates with the service port A via the main spool aperture 40A _1, sub-spool stop 3
Since 6B communicates with service port B through the main spool aperture 40B _1, pressure oil is diverted to the service port A and service port B by jacking cylinders 20A,
It is supplied to the extension side oil chamber of 20B.

Generally, the flow rate Q of the pressure oil flowing through the throttle is expressed by the following equation. Q = αS (2gΔP / ρ) ^1/2 where S: sectional area of throttle ΔP: pressure difference before and after throttle α: flow coefficient (constant) g: gravity acceleration ρ: specific weight of oil Left and right jack cylinders 20A, 20B If the load are equal, the pressure difference ΔP before and after the aperture in the main spool aperture 40A ₁ side and the main spool stop 40B ₁ side are equal,
At this time, the sectional area S of the stop is also equal.

Accordingly, the pressurized oil is divided into equal amounts by the distribution / collection valve 31 and supplied to the extension-side oil chambers of the jack cylinders 20A, 20B, so that the jack cylinders 20A, 20B simultaneously begin to extend by the same amount. That is, the vehicle-mounted crane is jacked up while maintaining the horizontal position.

If the loads on the left and right jack cylinders 20A and 20B are not equal, for example, the jack cylinder 20A
If the load on the side is large, the main spool throttle 40A
The pressure difference ΔP before and after the throttle on the _first side becomes small. Because, since the main spool 33 pressure on the left side oil chamber 41A of the main spool 33 rises to move to the right, opening the main spool aperture 40A ₁ side becomes wider, open the main spool aperture 40B ₁ side Is narrowed. Therefore, also in this case, the pressure oil is diverted into equal amounts by the distribution / collection valve 1 and supplied to the extension-side oil chambers of the jack cylinders 20A and 20B, so that the jack cylinders 20A and 20B simultaneously extend by the same amount.

When the jack cylinders 20A and 20B extend, as shown in FIG.
Reaches the stroke end (maximum extension) first. Then
The pressure in the oil chamber on the extension side of the jack cylinder 20A rises,
Since the pressure in the left oil chamber 41A of the main spool 33 rises along with this, close the main spool aperture 40B ₁ moves the main spool 33 to the right, the hydraulic pump 22
And the supply of the pressure oil to the extension-side oil chamber of the jack cylinder 20B is stopped.

Accordingly, the extension of the jack cylinder 20B is stopped, whereby the vehicle mounted crane is set in a state of being jacked up horizontally. When the jack cylinders 20A and 20B are returned from the extended state shown in FIG. 12 to the contracted state and the jack-up of the vehicle mounted crane is released, the switching valve 21 is switched as shown in FIG.
The pressure oil discharged from the hydraulic pump 22 flows into the reduction-side oil chamber of the jack cylinders 20A and 20B. Therefore, if the main spool 33 is in the neutral position, the jack cylinder 2
The hydraulic oil in the extension-side oil chambers 0A and 20B flows into the service port A and the service port B of the distribution / collection valve 31, and moves the sub spool 35A to the right and the sub spool 35B to the left. Therefore sub spool aperture 36A communicates with the service port A via the main spool aperture 40A _2,
The sub spool throttle 36B is the main spool throttle 40B ₂
, The pressure oil is collected from the service port A and the service port B, flows out from the supply port P, and returns to the tank 23.

The left and right jacking cylinders 20A, when the load of 20B are equal, the pressure differential across the diaphragm at the main spool aperture 40A ₂ side and the main spool stop 40B ₂ side Δ
P is equal, and at this time the sectional area S of the diaphragm is also equal. Accordingly, the pressurized oil from the extension-side oil chambers of the jack cylinders 20A, 20B is collected by the distribution / collection valve 31 in an equal amount, so that the jack cylinders 20A, 20B simultaneously start to contract by the same amount. That is, the jack-up of the vehicle-mounted crane is released while maintaining the horizontal position.

When the loads on the left and right jack cylinders 20A and 20B are not equal, for example, the jack cylinder 20A
When the load side is large, the main spool 3 pressure in the left oil chamber 41A rises of the main spool 33 moves to the right, narrows the opening of the main spool aperture 40A ₂ side, main spool stop open 40B ₂ side becomes wider. Therefore, also in this case, the jack cylinder 20A,
The pressure oil from the expansion side oil chamber of 20B is collected by the distribution / collection valve 1 in an equal amount, so that the jack cylinders 20A and 20B are simultaneously reduced by the same amount.

As the jack cylinders 20A and 20B shrink, as shown in FIG.
B reaches the stroke end (minimum contraction) first. Then, the pressure in the extension-side oil chamber of the jack cylinder 20A increases, and accordingly, the oil chamber 41 on the left side of the main spool 33 is increased.
The pressure of A is increased, a closed main spool aperture 40A ₂ moves the main spool 33 to the right, the pressure oil color extension side oil chamber of the jack cylinder 20A will not flow out to the blocked tank 23 side . Therefore, the contraction of the jack cylinder 20A stops.

In order to completely and reduce the size of the jack cylinder 20A, the operation of reducing the jack cylinder 20A is performed by using an operating pipe and a switching valve (not shown) for individually expanding and contracting the jack cylinder 20A and the jack cylinder 20B. I do.

[0022]

However, the distribution / collection valve 1 has the following disadvantages. For example, while the main spool 33 does not return to the neutral position from the state shown in FIG. 12, when operated switching current flow immediately switching valve 21 to the reduction side, since the main spool aperture 40B ₁ is closed, the sub-spool 35B Does not move, the flow of the hydraulic oil from the extension-side oil chamber of the jack cylinder 20B remains blocked, and the sub-spool 35A moves rightward as shown in FIG. 15 by the force of the hydraulic oil flow. As a result, the flow of hydraulic oil from the extension-side oil chamber of the jack cylinder 20A is blocked. For this reason, the jack cylinder 2
0A and the jack cylinder 20B do not operate.

When the hydraulic oil in the oil chamber 41A on the left side of the main spool 33 flows out and the main spool 33 returns to the neutral position by the force of the main spring 34B, the distribution / collection valve 31
Will be able to collect normally.

Further, before the main spool 33 returns to the neutral position from the state shown in FIG.
If you switched shunt manipulate the extension side, since the main spool aperture 40A ₂ is closed, the sub-spool 35A does not move, the flow of pressure oil to the extension-side oil chamber of the jack cylinder 20A will remain blocked, and The sub-spool 35B moves rightward as shown in FIG. 16 by the force of the flow of hydraulic oil, and blocks the flow of pressure oil to the extension-side oil chamber of the jack cylinder 20B. Therefore, the jack cylinder 20A and the jack cylinder 20B do not operate.

The left and right oil chambers 41A of the main spool 33,
When the pressure of 41B becomes equal and the main spool 33 returns to the neutral position by the force of the main spring 34B, the distribution / collection valve 31 can normally divide.

In order to return the main spool 33 to the neutral position, main springs 34A and 34B are provided on the left and right sides of the main spool 33. The urging force of the main springs 34A and 34B is provided in the distribution / collection valve 31. If the pressure is weak, especially at low temperatures, the main spool 3
3 becomes difficult to return, and the above-mentioned problem is easily caused.

Conversely, if the urging force is too strong, the return to the neutral position is quick, but, for example, as shown in FIG. 12, the main spool 33 moves rightward due to the pressure of the oil chamber 41A, and If the 40B ₁ close as, the main spool 33 to attempt to return to the neutral position by the force of the main spring 34B, it will adversely affect the block accuracy of the main spool aperture 40B _1.

Further, for example, in the case of the flow dividing operation, there is a pressure difference between the jack cylinder 20A and the jack cylinder 20B, and the main spool 33 is displaced by the pressure difference to open the main spool throttles 40A ₁ and 40B _1. Adjust the jack cylinder 20A and jack cylinder 2
When an equal amount of pressure oil is to be supplied to the main springs 0B and 0B, the main springs 34A and 34B on the pressed side may have a subtle effect on the flow dividing accuracy due to the deviation of the main spool 33.

The present invention solves such a problem in the distribution / collection valve, and operates reliably without causing malfunction even when abruptly changing the branch / collection operation, and
It is an object of the present invention to provide a distribution / collection valve capable of improving the block accuracy by the main spool throttle and the separation / collection accuracy.

[0030]

According to the present invention, a body having a supply port for hydraulic oil in the center, a service port to an actuator on the left and right sides, and slidably inserted in the body by a predetermined distance in the left-right axial direction. Cylindrical main spool, and a cylindrical sub-spool that is slidably inserted in the left and right sides of the main spool in the axial direction by a predetermined distance, respectively. Sub-spool throttles are provided, and fixed diaphragms are provided on the partition walls that divide the inside of each sub-spool to the left and right at a position closer to the center than the sub-spool throttles, and the inside of the main spool is located on the center side of the main spool. An oil passage communicating with the supply port is provided, and the left and right sides of the main spool are provided with the respective sub spool throttles of the left and right sub spools and the left and right side spools. In a distribution / collection valve provided with a pair of main spool throttles which are spaced apart from each other by a predetermined distance in the axial direction for communicating with the service port on the right side, sub-spools are provided on both left and right sides of the partition wall. A spring is provided for holding the spool at a neutral position within the main spool, and each sub-spool is provided with an oil groove for communicating the sub-spool throttle with both of the pair of main spool throttles when the sub-spool is at the neutral position. I have.

In the distribution / collection valve of the present invention, the sub-spool moves left and right by the force of the flow of the pressure oil, and the main spool moves left and right by the pressure difference between the left and right oil chambers to open the main spool throttle. To adjust.

This distribution / collection valve is used for the synchronized operation of two actuators. When branching is performed by the distribution / collection valve, the pressure oil supplied to the supply port of the distribution / collection valve moves the left sub-spool to the left and the right sub-spool to the right. The left sub-spool throttle communicates with the left service port via the main spool throttle, and the right sub-spool throttle communicates with the right service port via the right main spool throttle. It is shunted to a port and supplied to each actuator.

When the loads of the two actuators are equal, the pressures in the left and right oil chambers are equal, the main spool is at the center, the cross-sectional areas of the left and right main spool throttles are equal, and the pressure oil is equalized by the distribution / collection valve. Shunted. If the loads of the two actuators are not equal, a pressure difference occurs between the left and right oil chambers of the main spool, the main spool moves from the high pressure side to the low pressure side, and the opening of the high pressure side main spool throttle increases, and the low pressure side The opening of the main spool throttle becomes narrower. Therefore, also in this case, the pressure oil is divided into equal amounts by the distribution / collection valve and supplied to each actuator.

When collecting from each actuator,
The hydraulic fluid of the two actuators flows into the left and right service ports of the distribution / collection valve, and moves the left sub spool to the right and the right sub spool to the left. The left sub-spool throttle communicates with the left service port via the left main spool throttle, and the right sub-spool throttle communicates with the right service port via the right main spool throttle. From the service port and out of the supply port.

When the loads of the two actuators are equal, the pressures in the left and right oil chambers are equal, the main spool is at the center, the cross-sectional areas of the left and right main spool throttles are equal, and the hydraulic oil is equalized by the distribution / collection valve. It is gathered in. If the loads of the two actuators are not equal, a pressure difference occurs between the left and right oil chambers of the main spool, the main spool moves from the high pressure side to the low pressure side, and the opening of the high spool side main spool throttle becomes narrow, and the low pressure side The opening of the main spool throttle becomes wider. Therefore, also in this case, the hydraulic oil is collected by the distribution collecting valve from each actuator in an equal amount.

In this distribution / collection valve, the main springs are not provided on the left and right sides of the main spool, and on both left and right sides of the partition wall of each sub spool, there are provided sub springs for holding the sub spools in a neutral position in the main spool. The sub spool immediately returns to the neutral position even if the main spool is displaced and the switching operation from the diversion to the diversion or from the diversion to the diversion is performed suddenly in a state where the main spool is displaced. Gathering and branching are performed without any problem.

Further, since there is no main spring, when the main spool is displaced, it is not affected by the main spring, so that the block accuracy and the branching accuracy are improved.

[0038]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a distribution / collection valve according to an embodiment of the present invention when it is used for tuning operation of a jack cylinder of a crane mounted on a vehicle, and FIGS.
FIG. 4 is an explanatory diagram of an operation when the distribution / collection valve is used for tuning operation of a jack cylinder of a crane for mounting on a vehicle.

The distribution / collection valve 1 includes a cylindrical main spool 3 which is slidably inserted in the body 2 in the axial direction (left / right direction in the figure) by a predetermined distance, and left and right sides of the main spool 3. Are provided with cylindrical sub-spools 5A and 5B respectively slidably fitted in the axial direction by a predetermined distance.

The center of the body 2 is provided with a supply port P for hydraulic oil, and service ports A and B to the actuator on the left and right sides. Sub-spool throttles 6A and 6B are provided on the side surfaces of the sub-spools 5A and 5B, respectively. , 7B are provided with fixed diaphragms 8A, 8B.

An oil passage 9 for communicating the inside of the main spool 3 with the supply port P is provided on the center side surface of the main spool 3. A pair of main spool throttles 10A ₁ , 10A ₂ for communicating the sub-spool throttle 6A with the service port A and a pair of main spools for communicating the sub-spool throttle 6B with the service port B at a predetermined distance in the direction. Spool throttle 10B ₁ , 10B ₂
Are provided respectively.

The partition walls 7A, 7 of each sub-spool 5A, 5B
On both left and right sides of B, springs 12AL for holding the sub-spools 5A, 5B at a neutral position in the main spool 3,
12AR and 12BL, 12BR are provided.

The sub spool 5A is provided with an oil groove 13A for communicating the sub spool throttle 6A with both of the pair of main spool throttles 10A ₁ and 10A ₂ when the sub spool 5A is at the neutral position. 5B, when the sub-spool 5B is at the neutral position, the sub-spool throttle 6B is moved to a pair of main spool throttles 10B ₁ , 1B.
Oil groove 13B to communicate both the communicating of 0B ₂ is provided.

In the distribution / collection valve 1, the sub spool 5
A and 5B move right and left by the force of the flow of the pressure oil, and the main spool 3 moves left and right by the pressure difference between the left and right oil chambers 11A and 11B, and the main spool throttles 10A ₁ and 1A.
Adjust the opening of 0A ₂ , 10B ₁ , 10B ₂ .

The distribution / collection valve 1 is provided on each of the right and left sides of the vehicle-mounted crane, and is used to jack up the vehicle-mounted crane horizontally.
A, 20B are used for the tuning operation.

The extension-side oil chambers of the jack cylinders 20A and 20B and the reduction-side oil chambers of the jack cylinders 20A and 20B are connected to a hydraulic pump 22 and a tank 23 via a switching valve 21, respectively. The distribution collecting valve 1 is provided between the extension-side oil chambers of the jack cylinders 20A and 20B and the switching valve 21.

As shown in FIG. 1, when there is a step on the ground 24 on which the left and right jack cylinders 20A, 20B are installed, the switching valve 21 is switched as it is, and the jack cylinders 20A, 20B are connected via the distribution / collection valve 1. When extended,
The pressure oil discharged from the hydraulic pump 22 is divided into equal amounts by the distribution / collection valve 1 and supplied to the extension-side oil chambers of the jack cylinders 20A and 20B.
20B is simultaneously extended by the same amount, and the vehicle-mounted crane is set at an angle.

Therefore, in order to jack up the vehicle-mounted crane horizontally when there is such a step, first, an operating pipe and a switching valve for individually expanding and contracting the jack cylinder 20A and the jack cylinder 20B respectively. (Not shown), the jack cylinder 20A and the jack cylinder 20B are respectively extended, and the lower ends thereof are grounded as shown in FIG.

Next, when the switching valve 21 is switched as shown in FIG. 3, the pressure oil discharged from the hydraulic pump 22 flows into the supply port P of the distribution / collection valve 1, and moves the sub-spool 5A to the left.
The sub-spool 5B is moved rightward. Therefore, the sub-spool throttle 6A has an oil groove 13A and the main spool throttle 10A
Communicates with the service port A via _1, sub-spool aperture 6B oil groove 13B, since the communication with the service port B through the main spool aperture 10B _1, pressure oil is diverted to the service port A and service port B And supplied to the extension-side oil chambers of the jack cylinders 20A and 20B. The hydraulic oil in the reduced-side oil chambers of the jack cylinders 20A and 20B returns to the tank 23 via the switching valve 21.

The left and right jacking cylinders 20A, when the load of 20B are equal, the pressure differential across the diaphragm at the main spool aperture 10A ₁ side and the main spool stop 10B ₁ side are equal, also equal cross-sectional area of the aperture at this time . Accordingly, the pressurized oil is divided into equal amounts by the distribution / collection valve 1 and supplied to the extension-side oil chambers of the jack cylinders 20A and 20B, so that the jack cylinders 20A and 20B simultaneously start to extend by the same amount. That is, the vehicle-mounted crane is jacked up while maintaining the horizontal position.

When the loads on the left and right jack cylinders 20A and 20B are not equal, for example, the jack cylinder 20A
If the load on the side is large, the main spool throttle 10A
The pressure difference before and after the throttle on the ₁ side becomes smaller. Because, since the main spool 3 the pressure in the left oil chamber 11A of the main spool 3 is raised to move rightward, the opening of the main spool aperture 10A ₁ side becomes wider, open the main spool aperture 10B ₁ side Is narrowed. Therefore, also in this case, the pressure oil is diverted into equal amounts by the distribution / collection valve 1 and supplied to the extension-side oil chambers of the jack cylinders 20A and 20B, so that the jack cylinders 20A and 20B simultaneously extend by the same amount.

As the jack cylinders 20A and 20B extend, the jack cylinder 20A reaches the stroke end (maximum extension) first as shown in FIG. Then, the pressure in the oil chamber on the extension side of the jack cylinder 20A rises, and the pressure in the oil chamber 11A on the left side of the main spool 3 rises accordingly, so that the main spool 3 moves to the right and the main spool throttle 10B _1. Is closed, the pressure oil from the hydraulic pump 22 is blocked, and the supply of the pressure oil to the extension-side oil chamber of the jack cylinder 20B is stopped. Accordingly, the extension of the jack cylinder 20B is stopped, whereby the vehicle mounted crane is set in a state of being jacked up horizontally.

When the jack cylinders 20A and 20B are returned from the extended state shown in FIG. 4 to the contracted state and the jack-up of the vehicle mounted crane is released, the switching valve 21 is switched as shown in FIG. The pressure oil discharged from the pump 22 flows into the reduction-side oil chamber of the jack cylinders 20A and 20B. Therefore, if the main spool 3 is at the neutral position, the hydraulic oil of the extension-side oil chamber of the jack cylinders 20A and 20B is distributed. It flows into the service ports A and B of the flow collecting valve 1, and moves the sub-spool 5A to the right and the sub-spool 5B to the left. Therefore sub spool aperture 6A communicates with the service port A via the main spool aperture 10A _2, since the sub-spool aperture 6B communicates with service port B through the main spool aperture 10B _2, pressure oil is a service port A Service The water is collected from the port B, flows out of the supply port P, and returns to the tank 23.

[0054] left and right jacking cylinders 20A, when the load of 20B are equal, the pressure differential across the diaphragm at the main spool aperture 10A ₂ side and the main spool stop 10B ₂ side are equal, also equal cross-sectional area of the aperture at this time . Accordingly, the pressurized oil from the extension-side oil chambers of the jack cylinders 20A, 20B is collected by the distribution / collection valve 1 in an equal amount, so that the jack cylinders 20A, 20B simultaneously start to contract by the same amount. That is, the jack-up of the vehicle-mounted crane is released while maintaining the horizontal position.

If the loads on the left and right jack cylinders 20A and 20B are not equal, for example, the jack cylinder 20A
When the load side is large, the main spool 3 the pressure in the left oil chamber 11A of the main spool 3 is raised to move rightward, narrows the opening of the main spool aperture 10A ₂ side, main spool stop open 10B ₂ side becomes wider. Therefore, also in this case, the jack cylinders 20A, 2A
Since the pressure oil from the oil chamber on the extension side of 0B is collected by the distribution / collection valve 1 in an equal amount, the jack cylinders 20A and 20B are simultaneously reduced by the same amount.

As the jack cylinders 20A and 20B contract, as shown in FIG.
Reaches the stroke end (minimum contraction) first. Then
The pressure in the oil chamber on the extension side of the jack cylinder 20A rises,
Since the pressure in the left oil chamber 11A of the main spool 3 increases along with this, close the main spool aperture 10A ₂ moves the main spool 3 to the right, jacking cylinders 2
The pressure oil from the 0A extension side oil chamber is blocked and
No more flows to the 3 side. Therefore, the jack cylinder 20
The reduction of A stops.

In order to completely and shrink the jack cylinder 20A, the jack cylinder 20A is contracted by using an operating pipe and a switching valve (not shown) for respectively expanding and contracting the jack cylinder 20A and the jack cylinder 20B. I do.

In the conventional distribution / collection valve 31, for example, FIG.
From the state shown in 2 While main spool 33 does not return to the neutral position, when operated switching current flow immediately switching valve 21 to the reduction side, since the main spool aperture 40B ₁ is closed, the sub-spool 35B is moved not Then, the flow of hydraulic oil from the extension-side oil chamber of the jack cylinder 20B remains blocked, and the sub-spool 35A moves rightward as shown in FIG.
The flow of hydraulic oil from the extension-side oil chamber of the jack cylinder 20A is blocked. For this reason, the jack cylinder 20A
And the jack cylinder 20B do not operate.

However, in the distribution / collection valve 1, before the main spool 3 returns to the neutral position from the state of FIG.
When the switching valve 21 is immediately switched to the reduction side and the flow collecting operation is performed,
Sub spools 5A and 5B are springs 12AL and 12B
Return to the neutral position immediately with the force of R. Therefore, even if the main spool 3 has not returned to the neutral position, the service port B
The sub spool aperture 6B as shown in FIG. 7, communicate with each other through the main spool aperture 10B _2.

Therefore, the jack cylinders 20A, 20B
The hydraulic oil in the expansion side oil chamber flows into the service port A and the service port B of the distribution / collection valve 1 and can collect without any problem.

Further, in the conventional distribution / collection valve 31, FIG.
When the switching valve 21 is immediately switched to the extension side to perform the diversion operation before the main spool 33 returns to the neutral position from the state shown in FIG. 7, the sub spool 5A does not move because the main spool throttle 40A ₂ is closed, and the jack is not moved. Cylinder 20
The flow of pressurized oil to the oil chamber on the extension side of A remains blocked, and the sub-spool 5B is driven by the flow of hydraulic oil,
As shown in FIG. 16, the cylinder moves to the right and blocks the flow of the pressure oil to the extension-side oil chamber of the jack cylinder 20B. Therefore, the jack cylinder 20A and the jack cylinder 20B do not operate.

However, in the distribution / collection valve 1, before the main spool 3 returns to the neutral position from the state shown in FIG.
When the switching valve 21 is immediately switched to the extension side to perform the diversion operation,
Sub spools 5A and 5B are springs 12AR and 12B
It returns to the neutral position immediately with the force of L. Therefore, even if the main spool 3 has not returned to the neutral position, the service port A
The sub spool aperture 6A as shown in FIG. 8, communicating via 10A ₁ diaphragm main spool.

Therefore, the supply port P
Flows into the service port A and the service port B of the distribution / collection valve 1, so that the flow can be divided without any problem.

Further, the distribution / collection valve 1 is provided with a main spring for returning the main spool 3 to the neutral position.
Since it is not provided on the left and right sides of the main spool 3,
When the main spool 3 is displaced due to the pressure difference, it is not affected by the main spring on the displaced side.
Block accuracy and branch accuracy can be increased.

[0065]

As described above, the distribution / collection valve of the present invention can be reliably operated without causing a malfunction even when abruptly switching the branch / collection operation. Further, since no main spring for returning the main spool to the neutral position is provided, the block of the main spool throttle is reliably performed, so that the block accuracy is good and the accuracy of separation and flow can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram when a distribution / collection valve according to an embodiment of the present invention is used for a tuning operation of a jack cylinder of a crane for mounting on a vehicle.

FIG. 2 is an explanatory diagram of an operation when a distribution / collection valve is used for a tuning operation of a jack cylinder of a vehicle-mounted crane.

FIG. 3 is an explanatory diagram of an operation when the distribution / collection valve is used for a tuning operation of a jack cylinder of a vehicle-mounted crane.

FIG. 4 is an explanatory diagram of an operation when the distribution / collection valve is used for a tuning operation of a jack cylinder of a vehicle-mounted crane.

FIG. 5 is an explanatory diagram of an operation when the distribution / collection valve is used for a tuning operation of a jack cylinder of a vehicle-mounted crane.

FIG. 6 is an explanatory diagram of an operation when the distribution / collection valve is used for a tuning operation of a jack cylinder of a vehicle-mounted crane.

FIG. 7 is an explanatory diagram of an operation when the distribution / collection valve is used for a tuning operation of a jack cylinder of a vehicle-mounted crane.

FIG. 8 is an explanatory diagram of an operation when the distribution / collection valve is used for a tuning operation of a jack cylinder of a vehicle-mounted crane.

FIG. 9 is a configuration diagram when a conventional distribution / collection valve is used for tuning operation of a jack cylinder of a crane mounted on a vehicle.

FIG. 10 is an explanatory diagram of an operation when a conventional distribution / collection valve is used for a tuning operation of a jack cylinder of a vehicle-mounted crane.

FIG. 11 is an explanatory diagram of an operation when a conventional distribution / collection valve is used for a tuning operation of a jack cylinder of a vehicle-mounted crane.

FIG. 12 is an explanatory diagram of an operation when a conventional distribution / collection valve is used for tuning operation of a jack cylinder of a vehicle-mounted crane.

FIG. 13 is an explanatory diagram of an operation when a conventional distribution / collection valve is used for tuning operation of a jack cylinder of a vehicle-mounted crane.

FIG. 14 is an explanatory diagram of an operation when a conventional distribution / collection valve is used for tuning operation of a jack cylinder of a vehicle-mounted crane.

FIG. 15 is an explanatory diagram of an operation when a conventional distribution / collection valve is used for tuning operation of a jack cylinder of a vehicle-mounted crane.

FIG. 16 is an explanatory diagram of an operation when a conventional distribution / collection valve is used for a tuning operation of a jack cylinder of a vehicle-mounted crane.

[Explanation of symbols]

1 distribution current flow valve 2 body 3 main spool 5A, 5B sub spool 6A, 6B sub spool aperture 7A, 7B partition wall 8A, 8B fixed throttle 9 oil passage _{10A 1, 10A 2, 10B 1} , 10B 2 main spool aperture 11A, 11B Oil chamber 12AL, 12AR, 12BL, 12BR Spring 13A, 13B Oil groove 20A, 20B Jack cylinder 21 Switching valve 22 Hydraulic pump 23 Tank 24 Ground

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16K 11/00-11/24 F16K 21/00

Claims (1)

(57) [Claims] 1. A body having a hydraulic oil supply port in the center, a service port to an actuator on the left and right sides, and a cylindrical main spool inserted in the body so as to be slidable in the left-right axis direction by a predetermined distance. A cylindrical sub-spool that is slidably inserted in the main spool on the left and right sides in the axial direction so as to be slidable by a predetermined distance, and a sub-spool throttle is provided on a side surface of each sub-spool. A fixed throttle is provided on each of the partition walls that divide the inside of the sub-spool at a position on the center side from the sub-spool throttle, and an oil passage that communicates the inside of the main spool with the supply port is provided on the side of the center of the main spool. Each of the left and right sides of the main spool is provided with a sub-spool throttle of the left and right sub-spools and a left and right service port. A distribution / collection valve provided with a pair of main spool throttles which are spaced apart from each other by a predetermined distance in the axial direction for communication with each other. The sub-spool is provided with an oil groove for communicating the sub-spool throttle with both of the pair of main spool throttles when the sub-spool is in the neutral position. Distribution collector valve.