JPH074120Y2 - Liquid supply device for ultrasonic sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of Invention] "Industrial Application Field" The present invention relates to a liquid supply device to an ultrasonic sensor of a grindstone contact position detection device of a grindstone correction device of a grinding machine. Specifically, in the device for detecting the contact position of the grindstone correcting tool with respect to the grindstone by detecting the ultrasonic vibration oscillated by the contact between the grindstone and the grindstone correcting tool of the grindstone correcting device equipped with an ultrasonic sensor in the grindstone correcting device, A device for supplying a liquid to a sensor.

"Prior Art" It is well known that ultrasonic vibration is easily attenuated in the process of propagation, but is less attenuated in liquid. Therefore, the ultrasonic sensor provided in the grindstone correcting device is arranged in the flow of tap water, and tap water is filled between the ultrasonic sensor and the grindstone.

FIG. 2 is a vertical sectional view of the grindstone correcting device.

The main body 1 of the grindstone repairing device includes a bearing group 2 and a repair tool shaft 3
Is rotatably supported. The correction tool shaft 3 has an oil seal 5 fitted and fixed to a cover 4 which is hermetically fixed to the main body 1.
And is sealed with a shaft, and a whetstone correcting tool, for example, a rotary diamond whetstone 6 having diamond embedded in the outer periphery is fixed to the shaft end. The other end of the correction tool shaft 3 is connected to a motor 8 via a belt transmission device 7. A slit 9 is provided between the end face of the rotary diamond grindstone 6 and the end face of the cover 4. A case 12 containing an ultrasonic sensor 11 is hermetically fixed to the cover 4. A filter 13 is provided on the upstream side of the ultrasonic sensor 11. Narrow gap 9 in case 12 and cover 4
Further, a passage 14 is provided between the slit 9 and the ultrasonic sensor 11 for filling and interposing a liquid. Ultrasonic sensor 11 is case 12
It crosses the passage 10 for accommodating the filter 13 inserted thereinto, and both sides of the ultrasonic sensor 1 are liquid passages. The passage 14 has an inlet passage 14a whose inlet opening faces the ultrasonic sensor 11, and an outlet passage 14b whose outlet opening faces the side surface of the rotary diamond grindstone 6 and communicates with the slit 9.
Are connected by a communication passage 14c. The liquid flows from the direction of arrow a through the pipe 15, flows from inside to outside of the filter 13 fixed to the end of the pipe 15, and surrounds the ultrasonic sensor 11. The liquid flowing through the passage 14 is discharged through the slit 9. The slit 9 is appropriately sized so that the liquid to be supplied flows by filling the passage 14 and the slit 9.

In a state in which the rotary diamond grindstone 6 is rotated by driving the motor 8 and rotating the correction tool shaft 3 via the belt transmission device 7, the grindstone correcting device is moved by a feeding device (not shown) to show the rotary diamond grindstone 6 The ultrasonic waves generated when coming into contact with a rotating grindstone that is not rotated propagates through the rotary diamond grindstone 6, propagates into the liquid in the slit 9, and propagates to the ultrasonic sensor 11 via the liquid in the passage 14. The signal detected by the ultrasonic sensor 11 is amplified, A / D converted, and sent to the control device.

Conventionally, tap water is used as the liquid supplied from the direction of the arrow a in the device for detecting the position of contact with the grindstone of the grindstone correction tool described above in consideration of clogging of the sensor filter 13.

"Problems to be solved by the device" However, when tap water is used, (1) tap water rusts each part of the machine.

(2) The amount of the grinding fluid mixed into the grinding fluid gradually increases and finally overflows from the grinding fluid tank.

(3) Only the amount of tap water must be drained from the grinding fluid so that it does not overflow from the grinding fluid tank, and drainage facilities such as drainage pipes must be installed.

(4) Water pipes are required, and it may be necessary to add water pipes due to changes in the layout of grinding machines.

(5) The concentration of the main component in the grinding fluid gradually decreases. Therefore, different grinding fluids are used for the same work, and the grinding ratio, the required grinding power, the work surface temperature rise, etc. change.

It is an object of the present invention to provide a liquid supply device for an ultrasonic sensor in a grindstone contact position detection device for a grindstone correction tool that solves the above-mentioned conventional problems.

[Effect of device]

"Means for Solving the Problem" This invention is provided with an ultrasonic sensor, and a grinding fluid is interposed between the grindstone repair tool and the ultrasonic sensor to determine the contact sound between the grindstone repair tool and the grindstone through the grinding fluid. A contact position detecting device for the grindstone of the grindstone correcting tool, and grinding between the side facing the slit of the grindstone correcting tool and a member facing the slit and facing the slit and the grinding liquid supply side. In a liquid supply device for an ultrasonic sensor provided with a passage for a liquid, a liquid for an ultrasonic sensor, characterized in that an ultrasonic sensor is arranged in a passage for the grinding liquid on a main body side supporting a grindstone correcting tool. It is a supply device.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a piping diagram, and the sensor filter 13 in the figure is located at the position shown in FIG.

A suction pipe 18 with a strainer 17 attached to one end is submerged in the grinding liquid in the grinding liquid tank 16, and the grinding liquid sucked up through the suction pipe 18 is boosted and boosted by a pump 19 and discharged. Expelled to 20. A pressure switch 21 is interposed in the discharge pipe 20. The discharge pipe 20 branches into a grinding liquid supply pipe 22 for grinding and a grinding liquid supply pipe 23 for whetstone correction.

The grinding liquid flowing through the grinding liquid supply pipe 22 is ejected from the nozzle 24 at the end of the supply pipe 22 and is supplied toward the workpiece and the grindstone surface (not shown). A direction switching valve 25 is provided in the grinding fluid supply pipe 22 for grinding.

A direction switching valve 26 is provided in the grindstone-correcting grinding fluid supply pipe 23, and is branched downstream into a correction-grinding-wheel grinding fluid supply pipe 27 and a sensor-use grinding fluid supply pipe 28. The sensor grinding fluid supply pipe 28 runs through the sensor grinding fluid supply circuit 40. In the sensor grinding fluid supply circuit 40, the sensor grinding fluid supply pipe 28 is provided with a filter 29, a stop valve 30, and a flow rate checker 31 according to the flow, and the sensor grinding fluid supply circuit 40 goes out of the sensor grinding fluid supply circuit 40. The end of the supply pipe 28 is connected to the sensor filter 13 via the pipe 15.
Lead to. A differential pressure controller 32 for controlling the pressure difference across the filter 29 is provided in the sensor grinding fluid supply pipe 28. The differential pressure controller 32 issues a signal when the pressure difference between the grinding fluid before and after the filter 29 becomes equal to or more than a specified value, and the signal is used to issue an alarm to clean the filter 29. The flow rate checker 31 has a function of controlling the flow rate constant and a function of detecting the flow rate and issuing a signal.

During grinding, the direction switching valve 26 is closed and the direction switching valve 25 is open. The grinding fluid in the grinding fluid tank 16 is strainer 17, suction pipe.
It is sucked into the pump 19 via 18, and the pressure is increased and increased to the discharge pipe.
It is discharged to the grinding liquid supply pipe 22 and is supplied to the grindstone and the work (not shown) from the nozzle 24 through the direction switching valve 25. The grinding fluid applied to the grindstone is collected on the machine and passes through a reflux passage (not shown) to bring the grinding fluid tank 16
Reflux to.

When the grindstone is repaired, the direction switching valve 25 is closed, the direction switching valve 26 is opened, and the grinding fluid in the grinding fluid tank 16 is swollena 17,
It is sucked into the pump 19 through the suction pipe 18, is boosted in pressure and is discharged to the discharge pipe 20, enters the grindstone correction grinding liquid supply pipe 23, passes through the direction switching valve 26, and is passed through the correction grinding grinding liquid supply pipe.
27 and a sensor grinding fluid supply pipe 28. The grinding fluid flowing through the grinding fluid supply pipe 27 for correction grinding is supplied toward the contact position between the grindstone and the rotary diamond grindstone 6. When the grinding fluid that has flowed into the sensor grinding fluid supply pipe 28 passes through the filter 29, foreign substances such as grinding powder are removed, passes through the open stop valve 30, and is controlled by the flow rate checker 31 to a constant flow rate. Then, the fine particles are further removed by the sensor filter 13 so as to wrap around the ultrasonic sensor 11 and flow through the passage 14 and the slit 9 to fill the slit 9 with the grinding liquid. And then drain. Therefore, the passage from the ultrasonic sensor 11 to the rotary diamond 6 fills the passage 14, and the grinding liquid flowing out from the opening of the passage 14 to the slit 9 flows into the slit 19 at least near the opening. .

The grinding fluid supplied to act on the contact portion of the grinding wheel and the rotary diamond grinding wheel 6 and the grinding fluid flowing out from the slit 9 are collected on the machine and flow back to the grinding fluid tank 16 through a reflux path which is not disclosed. The contact sound between the grindstone and the rotary diamond grindstone 6 is transmitted to the ultrasonic sensor 11 and the contact position is determined. Therefore, it is possible to accurately determine the corrected depth of cut into the grindstone. The signal detected by the flow rate checker 31 is sent to the control device, and the control device displays an alarm on the outside of the set flow rate range or stops the grindstone correcting action.

In the embodiment, the whetstone correcting tool is a rotary diamond whetstone, but the same applies to a single stone diamond.

[Effect of device]

This invention is provided with an ultrasonic sensor, and a grinding fluid is interposed between the grindstone repair tool and the ultrasonic sensor to determine the contact sound between the grindstone repair tool and the grindstone through the grinding fluid. An ultrasonic sensor provided with a position detection device and provided with a passage for a grinding fluid between an opening facing a side surface of the grindstone correcting tool with a slit and facing the slit and a grinding fluid supply side. In the liquid supply device to the grinding machine, since it is a liquid supply device to the ultrasonic sensor, characterized in that the ultrasonic sensor is arranged in the passage of the grinding liquid on the main body side that supports the grindstone correction tool. Does not cause rust. Since water does not flow into the grinding liquid, the amount of the grinding liquid is increased and the grinding liquid is not diluted. It is easy to handle because only one type of liquid needs to be managed. Taking advantage of advantages such as no need for water pipes and drainage facilities, ultrasonic waves are propagated only from the grinding fluid to the ultrasonic sensor through the grinding fluid, so ultrasonic waves are detected with little attenuation,
This has the effect of accurately grasping the contact between the grindstone and the grindstone correction tool. Further, since the liquid checker is provided on the liquid supply side up to the ultrasonic sensor, it is ensured that the cutting liquid is always filled between the ultrasonic sensor and the grindstone correction tool. Furthermore, by providing a filter in the grinding liquid supply circuit, the abrasive grains and chips mixed in the grinding liquid are removed in the grinding action portion, and stable detection is possible.

[Brief description of drawings]

FIG. 1 is a piping diagram of an embodiment of the present invention, and FIG. 2 is a vertical sectional view of a grindstone correcting device. 1 ... Main body, 2 ... Bearing group, 3 ... Repair tool axis, 4 ...
Cover, 5 ... Oil seal, 6 ... Rotary diamond grindstone, 7 ... Belt transmission device, 8 ... Motor, 9 ...
… Slit, 11 …… Ultrasonic sensor, 12 …… Case, 13 …… Filter, 14 …… Passage, 15 …… Piping, 16 …… Grinding fluid tank, 17 …… Strainer, 18 …… Suction pipe, 19 ……pump,
20 …… Discharge pipe, 21 …… Pressure switch, 22 …… Grinding liquid supply pipe for grinding, 23 …… Grinding liquid supply pipe for grinding wheel correction, 24 …… Nozzle, 25,26 …… Direction switching valve, 27 …… Grinding liquid supply pipe for correction wheel, 28 …… Sensor grinding liquid supply pipe, 29 …… Filter,
30 …… Stop valve, 31 …… Flow checker, 32 …… Differential pressure controller, 40 …… Grinding fluid supply circuit for sensor.

Claims (3)

[Scope of utility model registration request] 1. A grindstone of a grindstone correcting tool, comprising an ultrasonic sensor, wherein a grinding liquid is interposed between the grindstone correcting tool and the ultrasonic sensor to determine a contact sound between the grindstone correcting tool and the grindstone through the grinding liquid. A contact position detecting device for the grinding wheel, and a grinding fluid passage is provided between the grinding fluid supply side and an opening provided in a member facing the side surface of the grindstone with a slit therebetween. A liquid supply device for an ultrasonic sensor, wherein the ultrasonic sensor is arranged in a passage of the grinding liquid on a main body side supporting a grindstone correction tool. 2. A utility model registration claim according to claim 1, wherein a flow rate checker for controlling the flow rate of the grinding fluid to a constant level is provided on the grinding fluid supply side to the grinding fluid supply source and the ultrasonic sensor. Liquid supply device for the ultrasonic sensor described. 3. A practical use characterized in that a filter for filtering the grinding fluid is provided on the upstream side of the flow of the grinding fluid with respect to the flow rate checker, and a differential pressure controller for controlling the pressure difference before and after the filter is provided. A device for supplying liquid to the ultrasonic sensor according to claim 1 or 2 of the new model registration.