JPS629810A - Intermittent feed control device - Google Patents

Abstract

PURPOSE:To ensure the intermittent movement of a fluid pressure actuator by enabling the easy installation thereof on an existing circuit in such a way that an intensifying piston and a change-over valve for the reciprocating motion thereof are repeatedly actuated on a pressurized fluid, and the fluid is intermittently discharged from a load passage. CONSTITUTION:When a solenoid changeover valve 37 has been turned to the right side, a cylinder 36 is controlled in respect of speed and moves to the right side, thereby causing a pressurized fluid for a circuit 41 to move a piston 2 to the left side, and flow into and fill an intensifying chamber 8. At this stage, a pressurized fluid in a pressure passage P flows into an application chamber 11 and a change-over valve body 3 is kept at the right side position. As soon as an operation member 30 has contacted a retaining member 31, a change-over valve body 4 moves to the left side, thereby changing over application chambers 11 and 12 for continuity to a discharge passage R and said passage P respectively, while a valve body 3 is made to move to the left, thereby changing over connecting passages 13 and 14 for continuity to said passages P and R respectively. Thereafter, the piston 2 moves to the right, thereby causing an increase in fluid pressure within the intensifying chamber 8, delivering the fluid from a load passage A to a circuit 42 for retreating the cylinder 36. As a result, the valve body 4 moves to the right, due to contact by a member 30 and causes the valve body 3 to restore the original position. In this way, the cylinder 36 repeats motion back and forth for intermittent machining feed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an intermittent feed control device that is effective when placed in a hydraulic circuit for feeding cutting tools installed in a machine tool that performs cutting such as a lathe or a drill press. Conventional technology] Conventionally, in machine tools such as lathes and drill presses, when the cutting tool is fed by a hydraulic actuator such as a hydraulic cylinder, long chips are generated continuously and become entangled with the cutting tool or the workpiece. An intermittent feed control device that controls the hydraulic actuator intermittently, such as forward/reverse operation or forward/stop operation, in the hydraulic circuit for feeding the cutting tool, so as not to damage the machined surface or pose a danger to the operator. are arranged so that cutting can be performed while cutting chips.

[Problem that the invention seeks to solve]

However, in this type of intermittent feed r, m device, the electromagnet of the solenoid switching valve is repeatedly turned on at predetermined intervals by an electric timer.
The hydraulic actuator can be operated intermittently to control the feed of the cutting tool by turning it off or by continuously rotating the switching valve with an electric motor. This requires an electric circuit, which is troublesome to handle and maintain, and is difficult to install in an existing hydraulic circuit.

The present invention aims to solve such problems by providing an intermittent feed control device that can be installed in an existing hydraulic circuit with a simple configuration and can provide reliable intermittent operation of a hydraulic actuator. purpose.

[Means for solving problems]

The structure of the present invention made to solve such problems is as follows:
The main body of the device has a pressure passage through which the pressure liquid flows, a load passage connected to the hydraulic actuator side, and a discharge passage connected to the low pressure side.The pressure liquid flows into the action chamber and the liquid in the action chamber is discharged. The piston moves in the axial direction to increase the pressure of the pressure liquid and discharge it into the load passage, and the piston moves in the axial direction by the action of the pilot liquid and switches the working chamber of the piston between the pressure passage side and the discharge passage side. It is equipped with a switching valve body that communicates with each other to cause the piston to reciprocate, and a pilot switching valve body that switches and controls the direction of action of the pilot liquid acting on the switching valve body, and the piston and the pilot switching valve body are arranged approximately in parallel. One end of the coaxial direction is provided protruding from outside the main body of the device, and an elastic thin plate-like operating member is fixed to one of the protruding portions, and a locking member that comes into contact with the operating member is provided on the other for driving. It is characterized by being made to do.

[Effect]

In this configuration of the present invention, by flowing pressure liquid into the pressure passage of the device main body, the piston is moved in the axial direction by the pressure liquid flowing into the action chamber via the switching valve body, and the pilot switching valve body is moved at a predetermined position. When the piston is moved by a predetermined amount, the pyro and g switching valves are operated to return and the switching valve is activated. Operate the body as a pilot and switch the direction of movement of the piston again.

By repeating this operation, the pressure liquid increased by the piston is intermittently discharged from the load passage, and the hydraulic actuator connected to the load passage is reliably operated intermittently.

In addition, since the piston and each valve body are automatically operated by pressure liquid, it can be easily installed in an existing hydraulic circuit with a simple configuration that requires connecting piping to the pressure passage, load passage, and discharge passage. can.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In Fig. 1, 1 is the main body of the device, which includes a pressure passage P through which pressure liquid flows and a load passage A that connects to the hydraulic actuator side.
and a discharge passage hole connected to the low pressure side, a piston 2 for increasing the pressure liquid inside and performing a discharge action, a switching valve body 3 for reciprocating the piston 2, and a pilot valve for switching the switching valve body 3. It is equipped with a pilot switching valve body 4 for operation.

The piston 2 is fitted into a hole 5 of different diameters provided through the main body 1 of the device so as to be movable in the axial direction.
7 is divided into sections, and a pressure intensifying chamber 8 is formed by a small diameter part connected to the end of the large diameter part, and a rod part 9 connected to the end of the small diameter part protrudes outside the main body 1 of the apparatus. The switching valve body 3 has a spool shape and is fitted into the fitting hole 10 so as to be movable in the axial direction, forming pilot action chambers 11 and 12 at both ends, and by moving in the axial direction, the pressure passage P and the discharge passage R are connected. Two communication passages 13.14 communicating with each of the working chambers 6.7 of the piston 2 are provided so as to selectively communicate with each other. The pilot switching valve body 4 has a spool shape, is arranged approximately parallel to the piston 2, and is fitted into the fitting hole 15 so as to be movable in the axial direction.By moving in the axial direction, each pilot action chamber at both ends of the switching valve body 3 is closed. 11,12
Pyro.

The pressure passage P and the discharge passage R are provided so as to be in switching communication with each other through passages 16 and 17. The pilot switching valve body 4 has one end 18 in the coaxial direction from which the piston 20 and the rod portion 9 protrude, which protrudes outside the main body 1 of the apparatus. Reference numeral 19 denotes a throttle valve section disposed in the communication passage 14, and as shown in FIG.
At the same time, the poppet valve body 23 fitted on the outer periphery of the cylindrical member 21 is seated on the valve seat 25 by the force of the spring 24, and the liquid from the action chamber 7 is It is designed to allow free flow. Reference numerals 26 and 27 designate check valves, which are arranged in the communication passages 29 formed by the throttle valve portions 19, so that the pressure liquid is increased in pressure by the axial movement of the piston 2 and is discharged into the load passage A. .

Reference numeral 30 denotes an operating member fixed to a rod portion 9 of the piston 2 that protrudes outside the device main body 1, and is made of an elastic spring material or the like and is formed into a thin plate shape, with its free end attached to the protruding portion of the pilot switching valve body 4. It fits loosely into the end portion 18. 31 and 32 are locking members provided on the protruding end portion 18 of the pilot switching valve body 4, and are
0 contact causes the pilot switching valve body 4 to interlock with the piston 2, and elastic members 33 and 34 are arranged on the contact surface to absorb the impact when the operating member 30 contacts. . The locking member 32 is screwed onto the protruding end portion 18 so as to be freely changeable in position in the axial direction.

FIG. 3 shows a hydraulic circuit in which an intermittent feed control device 40 according to the present invention is arranged, 36 is a hydraulic cylinder as a hydraulic actuator that controls the feed of a cutting tool of a machine tool, and 37 is a hydraulic cylinder that moves the hydraulic cylinder 36 forward.・The electromagnetic switching valve 38 is a non-return valve-sealing flow rate adjustment valve that operates to reverse and stop, and the two circuits 41.
42, the circuit 42 is arranged so that the liquid discharged from the hydraulic cylinder 36 can be throttle-controlled, so-called meter-out control. The intermittent feed control device 40 of the present invention has a pressure passage P
to the circuit 41, and the load passage A to the check valve and the flow rate adjustment valve 38.
The discharge passage R is connected to a circuit 42 on the side of the hydraulic cylinder 36 and to a liquid tank 43 as a low pressure side, respectively, by piping or the like.

Next, the operation of this configuration will be explained.

In the states shown in FIGS. 1 to 3, the electromagnetic switching valve 37 is in the neutral switching position, blocking pressure liquid from the pressure source side, and the hydraulic cylinder 3G is stopped.

From this state, the circuit 42 for advancing or cutting off the hydraulic cylinder 36 is connected to the low pressure side, and the hydraulic cylinder 36 moves to the right under speed control by the non-return valve sealing flow regulating valve 38. A part of the pressure liquid flowing into the circuit 41 flows into the pressure passage P of the intermittent feed control device 40 and flows into the three-way switching valve body passage 14.
It flows into the action chamber 7 through the throttle valve part 19 and moves the piston 2 to the left, and flows into the pressure increase chamber 8 through the branch passage 28 and check valve 26 to fill it. At this time, the liquid in the working chamber 6 is transferred to the discharge passage hole liquid tank 43 via the communication passage 13 and the switching valve body 3.
flows to Further, the pressure liquid in the pressure passage P flows as a pilot liquid into the pilot action chamber 11 via the pilot switching valve body 4 and the re-pilot passage 16, and holds the switching valve body 3 at the right switching position. When the piston 2 moves to the left by a predetermined amount and the operating member 30 comes into contact with the locking member 31, the pilot switching valve body 4 moves to the left in conjunction with the piston 2, causing the pilot action chamber 11 to enter the discharge passage R for pilot action. Switching the chambers 12 to the pressure passages P (right switching position),
The switching valve body 3 is moved to the left by the pilot liquid flowing into the pilot action chamber 12, and the communication passage 13 is moved to the pressure passage P.
Then, the communication passage 14 is switched to communicate with the discharge passage R (right switching position). The piston 2 moves to the right as pressure liquid flows into the working chamber 6, and the piston 2 moves the liquid in the working chamber 7 to the throttle valve part 1.
The poppet valve body 23 of No. 9 is removed from the valve seat 25 to open the communication path 1.
4 flows out to the discharge passage R via the switching valve body 3, and the pressure liquid in the pressure increase chamber 8 is increased in pressure by an amount corresponding to the pressure receiving area difference between the action chamber 6 and the pressure increase chamber 8, and the communication passage 29 is checked. A discharge action is applied to the circuit 42 from the load passage A via the valve 27. Due to the action C of this pressurized discharged liquid, the hydraulic cylinder 36 is moved backward by an amount corresponding to the discharged amount. Then, when the piston 2 moves to the right by a predetermined amount and the operating member 30 comes into contact with the locking member 32, the pilot switching valve body 4 is moved to the illustrated switching position and the switching valve body 3 is moved back to the illustrated switching position. The above-mentioned operation is automatically repeated again unless the pressure liquid flowing into the pressure passage P is cut off. Therefore, the hydraulic cylinder 36
The machine moves forward and backward repeatedly to perform intermittent cutting feed operations. Further, the return of the hydraulic pressure cylinder 36 is carried out by operating the electromagnetic switching valve 37 to the left switching position so that the pressure liquid flows into the circuit 42 and the circuit 41 is connected to the low pressure side. Then, the intermittent feed control device 40 stops because the pressure passage P is connected to the low pressure side.

With this operation, the intermittent feed control device 40 automatically operates by flowing pressure liquid into the pressure passage P, so it can be easily configured by providing connection piping to the pressure passage P, load passage A, and discharge passage R. Easily placed in hydraulic circuits. Furthermore, the moving speed of the piston 2 is changed by moving the throttle valve body 20 of the throttle valve part 19 in the axial direction to adjust the flow rate of the pressure liquid flowing into the working chamber 7, and the arrangement position of the locking member 32 is also adjusted. By changing the contact position with the operating member 30, the amount of movement of the piston 2, that is, the amount of liquid discharged, is changed, so if these are manipulated as desired, it is possible to obtain the optimum intermittent feed control depending on the application. I can do it. Moreover, the operation member 3 in the form of a thin plate having elasticity allows the piston 2 and the pilot switching valve body 4 to interlock with each other.
0 is carried out by contacting the locking members 31 and 32,
When the movement of the piston 2 is adjusted at a very small speed, the pyro/toggle switching valve body 4 can be moved quickly and well due to the accumulated elastic force of the operating member 30 after contact, and when adjusted at a high speed, the elastic deflection causes an impact. As a result, the generation of operational vibration and operational noise can be reduced to an extremely small level compared to conventional electromagnets. In addition, in the present invention, since elastic members 88 and 84 are provided on the contact surfaces of the locking members 31 and 32, vibration and noise can be further reduced.

FIG. 4 is a simplified symbol diagram of an intermittent feed control device showing another embodiment of the present invention. To explain the difference in structure from the first embodiment, the piston 20 and the rod side action chamber 7 also serve as a pressure increase chamber. At the same time, the check valve function of the throttle valve section 19 is omitted, and the same effect as described above is obtained.

〔Effect of the invention〕

As explained above, according to the intermittent feed control device of the present invention, by flowing the pressure body into the pressure passage, the piston for increasing the pressure liquid provided in the device main body and each switching for reciprocating the piston are controlled. Since the valve body can be operated automatically and repeatedly, it can be easily installed in an existing hydraulic circuit with a simple configuration, and reliable intermittent operation of the hydraulic actiniator can be obtained. In addition, since the piston and the pilot switching valve body are linked together by making use of the elastic force of the elastic thin plate operating member that comes into contact with the locking member, the movement speed of the piston can be adjusted over a wide range. It has features such as being able to move the body quickly and efficiently, reducing vibration and noise generated during contact, and achieving smooth operation.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an intermittent feed control device showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is an intermittent feed control device of the present invention. FIG. 4 is a simplified symbol diagram of an intermittent feed control device showing another embodiment. 1-m-device body, 2-m-piston, 3-m-switching valve body, 4-m-pilot switching valve body, 30-m-operating member, 31.32--one locking member, P-- One pressure passage, A-
-One load passage, 几-m-Discharge passage.

Claims (1)

[Claims] The main body of the device has a pressure passage through which the pressure liquid flows, a load passage connected to the hydraulic actuator side, and a discharge passage connected to the low pressure side.The pressure liquid flows into the working chamber and the liquid in the working chamber is discharged. The piston moves in the axial direction to increase the pressure of the pressure liquid and discharge it into the load passage, and the piston moves in the axial direction by the action of the pilot liquid and switches the working chamber of the piston between the pressure passage side and the discharge passage side. It is equipped with a switching valve body that communicates with each other to cause the piston to reciprocate, and a pilot switching valve body that switches and controls the direction of action of the pilot liquid acting on the switching valve body, and the piston and the pilot switching valve body are arranged approximately in parallel. One end of the coaxial direction is provided protruding from the outside of the device main body, an elastic thin plate-like operating member is fixed to one of the protruding parts, and a locking member that comes into contact with the operating member is provided on the other for interlocking. An intermittent feed control device characterized in that: