JPH0618779Y2 - Honing liquid supply controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a honing liquid supply control device in a liquid honing device.

<Prior Art> Conventionally, in a liquid honing device in which a honing liquid containing grinding abrasive grains is jet-supplied to a workpiece to perform polishing, it is driven by a motor 1 as shown in FIG. Using the diaphragm pump 2, the honing liquid stored in the tank 3 is sucked and discharged, and the high-pressure honing liquid is jetted from the jet port 4 toward the workpiece 5. Further, the honing liquid after polishing the workpiece 5 by the jet from the jet port 4 is returned to the tank 3 so as to be reused.

<Problems to be Solved by the Invention> However, in such a conventional liquid honing apparatus, when stopping the jetting of the honing liquid when the workpiece 5 is attached or detached, the motor 1 must be turned off one by one, Since the motor 1 is operated intermittently, there is a problem that a loss of starting torque occurs and the motor 1 is damaged.

It is also possible to provide an electromagnetic directional control valve 6 in the honing liquid pressure feed path as shown by the broken line in FIG. 2 and control the supply of honing liquid by the electromagnetic directional control valve 6 while the motor 1 is operating. However, there is a problem that the abrasive grains enter the sliding portion of the spool of the electromagnetic directional control valve 6 and become immobile, resulting in no durability.

The present invention has been made in view of such conventional problems, and an object thereof is to provide a honing liquid supply control device capable of controlling the supply of the honing liquid while continuously operating the motor without impairing the durability.

<Means for Solving Problems> Therefore, according to the present invention, the plunger reciprocated in association with the rotation of the motor and the diaphragm driven by the oil confined in the hydraulic chamber by the plunger are provided. The diaphragm pump is provided with a relief passage communicating with the hydraulic chamber and the oil reservoir, and a normally closed electromagnetic on-off valve is provided in the relief passage.

<Operation> In the above configuration, when the pump is operated and the electromagnetic opening / closing valve is kept closed, the diaphragm drives the diaphragm through the oil in the hydraulic chamber, and the displacement of the diaphragm sucks the honing liquid. Can be ejected. Also,
If the solenoid on-off valve is opened while the pump is operating continuously, the hydraulic chamber opens to the oil sump through the escape passage, so the diaphragm is not driven even when the plunger reciprocates, and honing liquid is drawn and discharged. Is stopped. Therefore, the supply of the honing liquid can be controlled by turning on / off the electromagnetic opening / closing valve while the pump is continuously operated, and the electric opening / closing valve controls the passage of the oil, not the honing liquid, so that there is no problem of durability.

<Embodiment> An embodiment of the present invention will be described below with reference to FIG.

In the diaphragm pump 2 shown in FIG. 1, a pump chamber 22 whose one side is partitioned by a diaphragm 21 is formed in the main body 20 on the pump section side, and the pump chamber 22 is communicated with the suction port 23 and the discharge port of honing liquid. An outlet 24 is formed. One-way valves 25 and 26 are provided at the suction port 23 and the discharge port 24, respectively.
Is installed.

A hydraulic chamber 28 is formed in the drive unit side main body 27 so as to face the pump chamber 22 with the diaphragm 21 interposed therebetween, and the hydraulic chamber 28 communicates with the auxiliary hydraulic chamber 30 via a through hole 29. And
A front end of a plunger 32 reciprocated by an eccentric cam 31 by the rotation of the motor 1 faces the auxiliary hydraulic chamber 30.
Further, the auxiliary hydraulic chamber 30 communicates with the oil sump 33 by the introduction passage 34, and the introduction passage 34 is connected to the auxiliary hydraulic chamber 30 from the oil sump 33.
A one-way valve 35 that is opened only in the direction of introduction of oil to 30 is provided. However, the one-way valve 35 is given a predetermined valve opening pressure by the spring 36. The above configuration is similar to the conventional one.

Here, as the configuration according to the present invention, the relief passages 37a, 37b, 37b, 37b, 37b, 37b that connect the hydraulic chamber 28 and the auxiliary hydraulic chamber 30 to the oil sump 33 are communicated with each other.
A normally closed electromagnetic on-off valve 38 is provided between the upstream escape passages 37a and 37b and the downstream escape passage 37c. In the drive circuit of the electromagnetic opening / closing valve 38, a detachment detection switch 39 such as a limit switch is inserted in series because the detachment operation of the workpiece is detected and the switch is turned on.

Next, the operation will be described.

If the motor 1 is operated and the electromagnetic opening / closing valve 38 is kept closed, when the plunger 32 is reciprocated by the rotation of the motor 1 via the eccentric cam 31, it is contained in the auxiliary hydraulic chamber 30 and the hydraulic chamber 28. The diaphragm 21 is driven via the hydraulic pressure. Then, the diaphragm 21 accompanying the rightward movement of the plunger 32
The displacement of the pump chamber 22 to the right expands the pump chamber 22, opening the one-way valve 25 and pumping the honing liquid from the suction port 23.
Inhaled into 22, diaphragm 21 with plunger 32 leftward
The pump chamber 22 is contracted by the displacement to the left, and the honing liquid in the pump chamber 22 is pressurized and the one-way valve 26 is pushed open and discharged from the discharge port 24.

In addition, when the workpiece is attached / detached, the attachment / detachment detection switch 39 is turned on and the electromagnetic open / close valve is set even if the motor 1 is continuously operated.
As a result of energizing the coil of 38 and opening the solenoid on-off valve 38,
The hydraulic passage 28, the auxiliary hydraulic chamber 30, and the oil sump 33 release passage 37
It communicates with a, 37b, 37c. Then, even if the plunger 32 reciprocates through the eccentric cam 31 due to the rotation of the motor 1, the oil in the auxiliary hydraulic chamber 30 and the hydraulic chamber 28 escapes to the oil sump 33, so the reciprocating motion of the plunger 32 is transmitted to the diaphragm 21. Not done. Therefore, the diaphragm 21 is not driven, and suction / discharge of the honing liquid is stopped.

In this embodiment, the electromagnetic opening / closing valve 38 is automatically opened when the work piece is attached / detached, which greatly improves the workability, but it can be opened / closed manually by a manual switch or the like. You may

<Effects of the Invention> As described above, according to the present invention, it is possible to control the supply of honing liquid by turning on / off the electromagnetic opening / closing valve while the motor is continuously operating, which leads to the extension of the life of the motor and the electromagnetic opening / closing valve. Since it may be provided in the passage of oil instead of the honing liquid, it is possible to obtain the effect that there is no problem in the durability of the electromagnetic opening / closing valve.

[Brief description of drawings]

FIG. 1 is a sectional view of a diaphragm pump for supplying honing liquid showing an embodiment of the present invention, and FIG. 2 is a circuit diagram of a honing liquid supply circuit showing a conventional example. 1 ... Motor, 2 ... Diaphragm pump, 21 ... Diaphragm, 22 ... Pump chamber, 23 ... Suction port, 24 ... Discharge port, 28 ... Hydraulic chamber, 30 ... Auxiliary hydraulic chamber, 31 ... Eccentric cam, 32 ... Plunger, 37a, 37b, 37c ... Relief passage, 38 ... Solenoid on-off valve

Claims (1)

[Scope of utility model registration request] 1. A diaphragm pump having a plunger reciprocating in association with the rotation of a motor and a diaphragm driven by oil contained in a hydraulic chamber by the plunger, and a grinding pump is provided by the diaphragm pump. In a liquid honing device that pressure-feeds a honing liquid containing particles and sprays it on a workpiece for polishing, a relief passage that connects the hydraulic chamber and the oil sump is provided, and a normally closed electromagnetic on-off valve is provided in this relief passage. A honing liquid supply control device characterized by being interposed.