JPH0341686B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a directional control valve that controls an actuator, such as a cylinder, that pushes up a heavy object or moves left and right, and is particularly suited to an ultra-small, inexpensive, and fast-response valve. Concerning a fast double directional control valve with pilot function.

[Conventional technology]

Conventionally, there is a directional control valve of this type, for example, as shown in FIG. The one shown in the figure is equipped with check valves 42b, which are exactly the same as check valve 42a, in the liquid chambers A' and B' of a cylinder 46 for moving a heavy object W left and right, respectively, and an electromagnetic valve that controls these check valves 42a and 42b. Directional switching valve 41a
An electromagnetic directional control valve 41b exactly similar to the above is provided, and the pressure oil from the pressure source P' and the oil returned to the tank T' are demagnetized and an electromagnetic four-way control valve 4 with a neutral spring is provided.
5. That is, when the electromagnetic directional switching valves 41a and 42b and the electromagnetic four-way switching valve 45 are demagnetized, the cylinder 46 maintains its current state, switches to the right direction where the electromagnetic directional switching valve 45 is energized, and the electromagnetic directional switching valve 41b is activated. When excited, pressure oil enters the liquid chamber
Since the cylinder 46 enters A' and the liquid chamber B' communicates with the tank T', the cylinder 46 moves in the direction from the liquid chamber A' to B' and moves the heavy object W to the right. Solenoid 4-way switching valve 45
Even if either of the directional control valve 41b and the electromagnetic directional control valve 41b is demagnetized, the heavy object W maintains its current position. Furthermore, when the electromagnetic four-way switching valve 45 is energized and switched to the left, and the electromagnetic four-way switching valve 41a is excited, the pressure oil enters the liquid chamber B' and the liquid chamber A' communicates with the tank T', so that the cylinder 4
6 moves from the liquid chamber B' to the direction A', and moves the heavy object W to the left. Even if either the electromagnetic four-way switching valve 45 or the electromagnetic directional switching valve 41a is demagnetized, the heavy object W maintains its current position.

[Problem that the invention seeks to solve]

However, such a conventional check valve 4
2a, 42b, electromagnetic directional control valve 41a, 41b, etc., in the case of a double pilot check function directional control valve, the electromagnetic directional control valve uses a spool type control valve, and the pilot check valve installed separately is used. Connected by piping. Therefore, it takes time for the pilot check to operate due to the inflow of pilot pressure oil, which is the operation signal from the electromagnetic directional control valve, and the volume of the pilot chamber is also large, so there is a delay in the rise of the pilot pressure oil, which is the operation signal. be. In addition, the spool-type switching valve requires a wrapping margin on the land portion of the spool, which causes a delay in response. Due to these factors, the response speed was slow. Furthermore, the check valve 42a and the electromagnetic directional control valve 41a, or the check valve 42a
42b and the electromagnetic four-way switching valve 45,
For example, there is a strong demand for a low-cost and ultra-compact double pilot function directional control valve that can be accommodated in a small volume of about 150 mm in length, 100 mm in width, and 60 mm in depth. The combination of hydraulic equipment provided by the company was far from satisfactory.

[Purpose of the invention]

Therefore, the present invention arranges two combinations of an electromagnetic directional control valve and a pilot check valve in parallel in the same block, changes the spools to poppets as the functional members forming them, and uses as much piping as possible, such as
This is done in an oil passage in a small block of about 50 mm cubic size, and the center axes of the poppet, pilot piston, and check valve are aligned with the center axis of the inner hole of the block, and they are parallel to each other. In addition, all the components can be integrated and housed in the inner hole of the block, and furthermore, the cylinder is miniaturized so that it can be controlled even if the conventional electric four-way switching valve for controlling the cylinder is omitted. The purpose of this research is to miniaturize a directional control valve with a check function and increase its response speed.

[Means to solve the problem]

In order to achieve such an object, the present invention provides a pressure source P port that opens on the surface of the block 52;
It is equipped with a tank T port, a connection A port and a B port, and cylindrical inner holes 31a and 31b are provided in parallel therein, respectively. ) Electromagnetic solenoids 1a and 1b of the electromagnetic directional control valve (b) Seats 10a, 10b and annular guide 11
spherical check valves 12a and 12b held in each liquid chamber formed by a and 11b; and (c) the solenoids 1a and 1b and the check valve 12.
a, 12b, the pistons 9 slide through the respective liquid chambers in the sleeves 7a, 7b, and pilot drive the respective check valves.
a, 9b and (d) The oil passages 8a and 8b linked to the oil chambers of the pistons 9a and 9b are slid through the inner holes of the sleeves 3a and 3b by the electromagnetic drive of the respective electromagnetic solenoids, and are connected to the P port. Or wire contact type balanced poppet 2a that can be switched and connected to the T port.
and 2b and (e) the guides, sleeves, and seats are stacked in parallel and integrated so that their central axes coincide with each other, and the block 52 includes the check valve 12.
The oil chambers a and 12b are connected to the above A port and B, respectively.
Oil passages 38a, 38b connected to the ports are provided, and the pistons 9a, 9b are driven to push open the check valves 12a, 12b, so that the A port and B port are connected to the inner holes 31b, 31a.
The structure is such that oil passages 37a and 39 are provided which are connected to the oil passages 8a and 8b on the sides, respectively.

[Operation] For this reason, when the electromagnetic soleroids 1a and 1b are demagnetized, the pistons 9a and 9b return to the positions shown in FIG. The pressure oil does not leak out and maintains its current position.

Now, when the electromagnetic directional control valve 1a is energized, the poppet 2 is actuated to push the piston 9a leftward and open the check valve 12a, thereby opening the oil chamber A' of the cylinder 46 in the block 52. 37
The pressure oil from the port P passes through oil passages 5b and 5a, and passes through the oil passage 32a on the side of the potato 2a to the specially provided oil passage 3.
9, the check valve 12a is pushed open and the liquid flows into the liquid chamber B' of the cylinder 46, moving the weight W to the right.

Next, when the electromagnetic directional control valve 1a is demagnetized, the pressure oil from the port P drives the piston 9b, opens the check valve 12b, and passes through the oil passages 38a, 38b and 37a, 39 specially provided in the block 52.
The heavy object W can be moved to the left by the same operation as described above.

Furthermore, when the electromagnetic solenoid 1b is demagnetized, it returns to the initial state and the cylinder 46 maintains its current state.

By controlling the electromagnetic directional control valves 1a and 1b in this way, the electromagnetic 4-way control valve 45 is not used as in the conventional method, and even small directional control valves integrated in the same block can be used. You can push up heavy objects and move them freely from side to side.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment in which a double pilot check function directional control valve according to the present invention is used to control a cylinder for moving a heavy object.

In the figure, a block 52 has ports P, T, A, and B that open on its surface, and its interior has parallel cylindrical inner holes 31a and 31b, and the inner holes 31a and 31b have electromagnetic ports, respectively. Solenoids 1a and 1b (only the indicating member of the electromagnetic solenoid is shown, the others are not shown), sleeves 3a and 3b, spacers 6a and 6b,
Sleeves 7a and 7b, seats 10a and 10b, guides 11a and 11b, and plugs 16a and 16
(a) The electromagnetic solenoids 1a and 1b are fixed by screwing their supporting parts into one ends of the inner holes 31a and 31b, respectively, (b) The sleeves 3a and 3b (c) The poppets 2a and 2b are respectively held in the sleeve inner hole and are operated by electromagnetic solenoids 1a and 1b. Edges 17a and 17b of the sides of sleeves 3a and 3b that are driven and also contact spacers 6a and 6b
(d) The spacers 6a and 6b have recesses in a balanced shape that are in line contact with each other by the pressure of the springs 4a and 4b and close the oil passages 34a and 34b leading to the port P via the oil passages 5a and 5b. It has a through hole inside, and the through hole opens to oil passages 8a and 8b and 13a and 13b provided in sleeves 7a and 7b, and poppets 2a and 2b are activated by springs 4a and 4b, respectively, by actuation of electromagnetic solenoids 1a and 1b. When the sleeves 7a and 7b are compressed and brought into close contact with the end faces of the sleeves 7a and 7b, the oil passages 34a and 34b are opened, and the oil passages 13a and 13b are closed, and the oil passages 6a and 7b are closed.
and 6b each have an annular groove on the circumference, and have oil passages 32a and 32b communicating from the annular groove to the through hole, (e) Sleeves 7a and 7b have spacers 6a and 6, respectively.
The springs 4a and 4b are held on the end surface in contact with the seats 10a and 10b, and the other end surface in contact with the seats 10a and 10b is provided with an inner hole having a liquid chamber that opens and communicates with the oil passages 8a and 8b, and pistons 9a and 9b are held in the inner hole. The oil passages 14a and 14b have annular grooves at two locations on the circumference, and each annular groove leads to a portion of the inner hole corresponding to the drive shaft portion of the pistons 9a and 9b and oil passages 13a and 13b, respectively. and oil passages 35a and 35b, (f) the pistons 9a and 9b are connected to the seats 10a and 1, respectively.
0b, the check valves 12a and 12b are pilot driven, and the land diameter is larger than the diameter of the inner hole of the seats 10a and 10b; forming a liquid chamber via 11b;
Two spherical check valves 12a and 12 are provided in the liquid chamber.
(h) The guides 11a and 11b each have an annular groove on the circumference, and the check valves 12a and 12 are connected to the annular groove from the annular groove.
Oil passages 18a and 18b leading to the liquid chamber where b is located
(i) The plugs 16a and 16b each have the inner hole 31a.
and 31b, and the protrusions of the plugs 16a and 16b press against the seats 10a and 10b; (k) Oil passage 5a that connects oil passages 34a and 34b, oil passage 5b that connects oil passage 34b and port P, and oil passage 35a and 35b. Oil passage 36a, oil passage 3
Oil passage 36b connecting 5b and port T, oil passage 1
Oil passage 37a and oil passage 39, oil passage 18a and port A, and oil passage 18b and port B, which connect 4a and 32b and oil passages 14b and 32a, respectively.
Oil passage 38a and oil passage 38 connecting respectively
b. Both of these oil passages are provided in the block 52.

In addition, port P is connected to pressure source P', port T is connected to tank T', port A is connected to liquid chamber A' of cylinder 46,
Ports B are connected to liquid chambers B' of cylinders 46, respectively. W indicates a heavy object in which the cylinder 46 moves from side to side. Regarding the electromagnetic solenoids 1a and 1b, only the supporting members of the electromagnetic solenoids are shown, and the drive shaft and electromagnetic coil fixed to the movable piece are not shown. The same applies to plugs 16a and 16b provided at the other end of 31b.

Next, the operation of the double pilot function directional control valve of the present invention will be explained. Poppets 2a and 2b are connected to oil passages 5b, 34b, and 5a from port P, respectively.
For the pressure oil flowing in through 34a and 34a, and the pressure oil flowing from port P through oil passages 5b and 34b, the pressure in the left and right direction due to the pressure oil is balanced in the balance-shaped recess, so it is stationary. There is. In the illustrated state, the electromagnetic solenoids 1a and 1b are demagnetized, and the poppets 2a and 2b are pushed to the right by the spring resistance of the springs 4a and 4b, and the edges 17a and 17b of the sleeves 3a and 3b are pressed to the right.
The oil passages 34a and 34b are closed by making line contact with each of the oil passages 34a and 34b. Oil passages 8a and 8b are oil passage 1, respectively.
3a and 13b through the through holes of spacers 6a and 6b, and the oil passage 13a communicates with oil passages 35a, 36a, 35.
b and 36b to port T, and oil passage 13
b leads to port T via oil passages 35b and 36b. The pistons 9a and 9b are returned to their respective positions as shown by the check pressure of the check valves 12a and 12b, and are in the check state. Therefore, from ports A and B oil passages 38a and 38b and oil passages 18a and 18b
cylinders 4 which communicate with the liquid chambers A' and B' respectively through
Since none of the pressure oil in cylinder 6 leaks out, cylinder 4
6 is a state in which the current position is held. When the electromagnetic directional control valve 1a is next energized with both the electromagnetic solenoids 1a and 1b demagnetized,
The poppet 2a comes into close contact with the end surface of the sleeve 7a while compressing the spring 4a, thereby opening the edge 17a and closing the oil passage 13a by this contact. Pressure oil from port P flows into the open passage of edge 17a via oil passages 5a and 34a, and flows into oil passage 8a.
, enters the liquid chamber at the bottom of the sleeve inner hole of the sleeve 7a, and presses the piston 9a to the left. Since there is a difference between the pressure acting areas of the check valve 12a and the piston 9a, the piston 9a
moves to the left, and the drive shaft of the piston 9a advances to the seat 10a to open the check valve 12a.
8a to the liquid chamber, and further oil passages 14a and 37a.
It leads to the oil passage 32b through the oil passage 13b and the oil passage 3
6b, reaches port T, and returns to tank T'.
On the other hand, pressure oil from port P is oil passage 5b, 34b, 5
a and 34a, passes through the passage of the opened edge 17a, passes through oil passages 32a and 39, and flows into oil passage 14b. This pressure oil pushes open the check valve 12b and flows into the liquid chamber, passes through the oil passages 18b and 38b to port B, and flows into the liquid chamber B' of the cylinder 46. Therefore, the cylinder 46 is connected to the liquid chamber B'.
Move in the direction of A' and move the heavy object W to the right.
Next, when the electromagnetic solenoid 1a is demagnetized, it returns to the initial state and the cylinder 46 is maintained in its current state. Next, the action when the electromagnetic solenoid 1a is excited is the same as the description when the symbols a and b are exchanged, but will be briefly explained. When the electromagnetic solenoid 1b is energized, the poppet 2b opens the edge 17b and closes the oil passage 13b. Pressure oil flows from port P to piston 9
The pressure oil in the liquid chamber B' of the cylinder 46 that drives the check valve 12b and opens the check valve 12b reaches the liquid chamber of the check valve 12b, passes through the oil passages 14b and 39, reaches the oil passage 32a, and further flows through the oil passages 13a, 35a, 36a, 35b and 36b to port T and return to tank T'. On the other hand, the pressure oil from the port P passes through the open passage of the edge 17b, reaches the oil passage 14a via the oil passages 32b and 37a, pushes open the check valve 12a, flows into the liquid chamber of the check valve 12a, and enters the oil passage. 18a
and 38a to port A, and cylinder 4
The liquid flows into the liquid chamber A' of No.6. Therefore, the cylinder 46
moves from liquid chamber A' to direction B'. The heavy object W moves to the left. Next, when the electromagnetic solenoid 1a is demagnetized, it returns to the initial state, and the cylinder 46 maintains its current state. In this order, electromagnetic directional valve 1
If a and 1b are controlled, the electromagnetic four-way switching valve 45 shown in the conventional embodiment shown in FIG. 2 becomes unnecessary, resulting in a significant saving in functional components.

〔Effect of the invention〕

According to the present invention, a combination of a conventional pilot check valve and an electromagnetic directional valve is integrated into a single ultra-compact block to create a directional valve with a double pilot function. There is no need to provide one, and the pilot pressure oil passage is significantly shortened, the pilot pressure oil fluid chamber volume is reduced,
In addition, by changing the spool valve to a poppet valve, the response time has been shortened to about 1/3 of the conventional value, and the space for the double pilot function directional control valve has been made ultra-compact to meet the customer's needs. In particular, the combination of two sets of pilot check valves and electromagnetic directional control valves, and the specific connection of their connecting oil passages, have enabled the integration of these functions, including new functions of conventional electromagnetic 4-way control valves. It should be said that the level has improved. It is obvious that each member is simplified and miniaturized in this way, and therefore the processing and assembly time for each member is shortened, resulting in cost reduction.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the double pilot function directional control valve of the present invention, and FIG. 2 is a hydraulic circuit diagram showing a conventional embodiment. 1a and 1b...electromagnetic solenoid, 2a and 2b...
...Poppet, 3a and 3b and 7a and 7b...Sleeve, 4a and 4b...Spring, 6a and 6b...
Spacers, 9a and 9b... Pistons, 10a and 1
0b...Sheet, 11a and 11b...Guide, 1
2a and 12b...check valve, 16a and 16b...
...Plug, 17a and 17b...Edge, 5a, 8
a, 13a, 14a, 18a, 34a, 35a,
36a, 37a, 38a and 13b, 14
b, 18b, 34b, 35b, 36b, 37b,
38b, 39...oil passage, 31a and 31b...inner hole, 41a and 41b...electromagnetic directional control valve, 42a
and 42b...check valve, 43 and 45...electromagnetic 4
Directional switching valves, 44 and 46...cylinders, 51 and 52...blocks.

Claims (1)

[Claims] 1. A pressure source P for opening on the surface of the block 52.
It has a port, a T port for a tank, an A port and a B port for connection, and has cylindrical inner holes 31a and 31b arranged in parallel therein, respectively. (a) Electromagnetic solenoids 1a and 1b of the electromagnetic directional control valve and (b) Seats 10a, 10b and annular guide 11
(c) spherical check valves 12a and 12b held in each liquid chamber formed by solenoids 1a and 11b and check valve 12;
a, 12b, the pistons 9 slide through the respective liquid chambers in the sleeves 7a, 7b, and pilot drive the respective check valves.
a, 9b and (d) The oil passages 8a and 8b linked to the oil chambers of the pistons 9a and 9b are slid through the inner holes of the sleeves 3a and 3b by the electromagnetic drive of the respective electromagnetic solenoids, and are connected to the P port. Or wire contact type balanced poppet 2a that can be switched and connected to the T port.
and 2b and (e) the guides, sleeves, and seats are stacked in parallel and integrated so that their central axes coincide with each other, and the block 52 includes the check valve 12.
The oil chambers a and 12b are connected to the above A port and B, respectively.
Oil passages 38a, 38b connected to the ports are provided, and the pistons 9a, 9b are driven to push open the check valves 12a, 12b, so that the A port and B port are connected to the inner holes 31b, 31a.
A double directional control valve with a pilot check function, characterized in that oil passages 37a and 39 are connected to the side oil passages 8a and 8b, respectively.