JPH0679609B2 - Sudden stop device for dental air turbine hand piece - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for sudden stop of a dental air turbine handpiece, and more particularly, to one device between the dental unit body and the dental air turbine handpiece. The present invention relates to an improved quick stop device for a dental air turbine handpiece provided with a drive compressed air line.

[Conventional technology]

In a conventional quick stop device for a dental air turbine handpiece, two air pipelines, a supply pipeline for supplying compressed air to the air turbine and a long exhaust pipeline for exhausting the compressed air injected to the air turbine, are provided. When the air supply valve provided in the air supply line is closed, a circuit is formed so that the exhaust valve provided in the exhaust line is brought into a conductive state and the compressed air is sent back. The time to send back to the exhaust pipe line is set by manually setting an air timer consisting of a time switch or a throttle valve, a check valve, and a pneumatic tank, and compressed air is reverse-injected into an air turbine for a certain time to rotate inertially. The air turbine that was operating was being stopped suddenly.

(Problem to be Solved by the Invention) However, according to the conventional method of suddenly stopping the air turbine, which switches the air supply / exhaust valves of the two air supply / exhaust pipes to inject compressed air backward as in the conventional case, There is a problem that the pressure loss corresponding to the length of the exhaust pipe line is very large, and it is difficult to speed up the rotation of the air turbine.

In addition, the flexible hose connecting the dental unit body and the air turbine handpiece has a large diameter, a large weight, and poor flexibility, which causes a problem that the operability of the dental air turbine handpiece is impaired. Have.

[Means for Solving Problems] The present invention has been made in view of the above problems, and includes a dental air turbine handpiece and a dental unit main body.
By connecting with a compressed air line for driving the book, the pressure loss can be reduced to enable high-speed rotation of the air turbine, and the diameter of the flexible hose can be reduced, the weight can be reduced, and the flexibility can be improved. An apparatus for improving the operability of an air turbine handpiece for a vehicle. That is, (1) to reverse the air supply to the output side of the shuttle valve provided in the dental unit main body and the air supply to the air turbine provided directly at the base end of the dental air turbine handpiece or in the joint. Of the set pressure responsive switching valve of FIG. 1 is connected by a single compressed air pipe via an on-off valve with a time limiter, and a drive having an on-off valve for the compressed air source in the dental unit body and the shuttle valve. Stop device for a dental air turbine handpiece constructed by connecting two compressed air pipelines, a compressed air pipeline for compression and a compressed air pipeline for stopping having a pressure reducing valve, and (2) inside a dental unit body Provided on the output side of the shuttle valve provided on the dental air turbine handpiece directly or in the joint portion,
A set pressure responsive switching valve for reversing the air supply to the air turbine is connected by a compressed air pipe via an on-off valve with a timing device, and the compressed air in the dental unit body is connected. The source and the shuttle valve are connected by two compressed air pipelines, a compressed air pipeline for driving having an on-off valve with flow rate adjustment and a compressed air pipeline for stopping having a pressure reducing valve,
A sudden air stop device for a dental air turbine handpiece, characterized in that a control circuit for detecting and limiting information from an on-off valve with flow rate adjustment is provided in the time limiter.

(Embodiment) An embodiment of the sudden stop device for a dental air turbine handpiece according to the present invention will be specifically described below with reference to the drawings.

1 and 2 are circuit diagrams showing the operating state of compressed air when the dental air turbine handpiece of the first embodiment of the present invention is used and when it is suddenly stopped, and FIGS. 3 and 4 show examples. FIG. 5 and FIG. 6 are circuit diagrams showing the operating state of compressed air at the time of using the two-device dental air turbine handpiece and at the time of sudden stop, respectively. FIG. 7 and FIG. 8 are circuit diagrams showing an operating state of compressed air when stopped, and FIGS. 7 and 8 are circuit diagrams showing an operating state of compressed air when the dental air turbine handpiece of Example 4 is used and when it is suddenly stopped. .

Embodiment 1 In FIGS. 1 and 2, a cutting bar rotating air turbine 11 is installed in a dental air turbine handpiece 1, and a set pressure responsive switching valve 8 is installed in a base end portion thereof. An installed joint portion 8'and an atmosphere opening port 28 are provided.

Compressed air pipelines 16, 17, 20, 23, 23a, 2 for driving that connect the compressed air source 2 and the dental air turbine handpiece 1
A branch pipe 18 for stop is first branched to 4, 25, 25a, then connected to the foot controller 4, and the pipe 17 continuous to the pipe 20 is for driving the well-meaning drive main valve 6a. Port, conduits 23, 23a and the other input side of the shuttle valve 10 forming a logical sum circuit, conduit 24, delay valve 7, conduit 25,
The drive port of the pressure-responsive switching valve 8 provided in the joint portion 8'and the supply line 26 provided in the dental air turbine handpiece are sequentially connected.

The hanger valve 3 is connected to the stop branch pipe line 18, and the pipe line 29 ahead thereof is branched into two pipe lines 29a and 29b. One of the conduits 29a is sequentially connected to the control port of the driving main valve 6a, and the other of the conduits 29b is sequentially connected to the pressure reducing valve 9 and the other input side of the shuttle valve 10 forming an OR circuit. ing.

Further, the branch pipe line 23b for the time limit device is a pneumatic time limit device 1 for a time limit return configured by arranging a check valve 12a and a throttle valve 12b in parallel.
It is connected via 2 to the control port of the delay valve 7.

Further, the conduit 25b branched from the conduit 25 is provided with a check valve 8a.
Is connected to the control port of the pressure-responsive switching valve 8 and the throttle valve 8b continuous to the atmosphere opening port.

The shuttle valve 10 has a state in which the compressed air pressure for stop (compressed air pressure for drive> compressed compressed air pressure for stop> normal pressure) decompressed by the decompression valve 9 and the foot controller 4 are in a conduction state (compressed drive air pressure) or a closed state. By comparing the compressed air pressure for driving at (normal pressure), the conduit side (the conduit 23a and the conduit 24 or the conduit 30 and the conduit 24) having the higher air pressure is brought into conduction.

That is, in the operating state, the compressed air pressure for driving becomes higher than the compressed air pressure for stop reduced by the pressure reducing valve 9, so that the shuttle valve 10 brings the conduits 23a and 24 into conduction. On the other hand, in the sudden stop state, as shown in FIG.
The stop compressed air pressure becomes higher than the drive compressed air pressure (normal pressure) which is released from the atmosphere opening port of the foot controller 4 and is atmospheric pressure, and the shuttle valve 10 is provided with the pipe line 30 and the pipe line 24.
To conduct.

Further, the pneumatic control device 12 adjusts the discharge speed of the compressed compressed air for control by the throttle valve 12b so that the sub valve of the delay valve 7 is kept in the pressed state even after closing the foot controller 4, and the delay The valve 7 is kept closed for a certain period of time and then closed.

The pressure-responsive switching valve 8 is provided with a check valve 8a and a throttle valve 8b whose pressures are set so as to perform a switching operation when the pressure exceeds a set pressure so that compressed air above the set pressure is applied to the pipeline. The switching operation is performed. That is, when the compressed air for driving (> set pressure) is applied, the pressure responsive switching valve 8 makes the conduit 25a and the supply conduit 26 electrically conductive, and the compressed air for stop (<set pressure) is applied. Then, the conduit 25 and the exhaust conduit 27 are brought into conduction.

When the dental air turbine handpiece 1 is removed from the hanger valve 3 for the purpose of treatment and the hanger valve 3 is released from the hooked state, the hanger valve 3 is brought into a conductive state and compressed air for stopping is used. Through the hanger valve 3 and the conduit 29b, the pressure is reduced by the pressure reducing valve 9 and then input to the stop conduit side of the shuttle valve 10 that forms an OR circuit.
At this time, the shuttle valve 10 compares the compressed compressed air on the stop line side with the air pressure (normal pressure) on the drive line side to compare Road 24
To conduct. Then, the compressed air for stopping reaches the delay valve 7.

Next, in order to start the tooth cutting operation, when the foot controller 4 is stepped on to bring it into a conducting state, the compressed air for driving is supplied to the pipe lines 16 and 17, the foot controller 4, the pipe line 20,
For controlling the delay valve 7 from the check valve 12a and the throttle valve 12b of the pneumatic timing device 12 through the drive main valve 6a and the pipe line 23 which are brought into conduction by releasing the hooked state of the hanger valve 3. A voltage is applied to the port and the shuttle valve 10 to bring the delay valve 7, the conduit 23a and the conduit 24 into conduction. At this time, the shuttle valve 10 compares the compressed air pressure for driving (> compressed compressed air pressure) and the compressed air pressure for stopping, and brings the conduits 23a and 24 on the side of the driving conduit, which has a high air pressure, into a conductive state.

Further, the compressed air for driving (> setting pressure) is supplied to the delay valve 7
Then, the auxiliary valve of the pressure-responsive switching valve 8 which is switched by the input of compressed air pressure higher than the set pressure via the pipe 25 is pressed to bring the pipe 25 and the supply pipe 26 into conduction.

As a result, the compressed air for driving is supplied to the conduits 16 and 17, the foot controller 4, the conduit 20, the main driving valve 6a, the conduit 23,
23a, shuttle valve 10, conduit 24, delay valve 7, conduits 25, 25a,
Air is injected into the air turbine 11 through the pressure-responsive switching valve 8 and the air supply line 26 to rotate the air turbine 11 at a high speed. The air after injection is discharged from the atmosphere opening port of the pressure-responsive switching valve 8 and the atmosphere opening port 28 of the dental air turbine handpiece 1 through the exhaust pipe line 27.

Next, when the tooth cutting work is completed and the foot pressure of the foot controller 4 is released to close the driving compressed air pipeline, as shown in FIG. 2, the driving compressed air pipelines 20, 23,
The compressed air of 23a, 25, and 25a is discharged from the atmosphere opening port of the foot controller 4, the atmosphere opening port 28 of the dental air turbine handpiece, and the atmosphere opening port of the pressure-responsive switching valve 8 to become normal pressure. . Then, compressed air for stoppage (> normal pressure) is applied to the shuttle valve 10 so that the pipeline 30 and the pipeline 24 are brought into conduction.

In addition, the pneumatic time delay device 12 for time delay reset operates, and the delay valve 7 is kept closed for a certain period of time and then closed.

Further, in the pressure-responsive switching valve 8, the compressed compressed air for control (> setting pressure) that has pressed the sub valve of the pressure-responsive switching valve 8 is released to the atmosphere from the throttle valve 8b and becomes normal pressure. After returning, the conduit 25a, the exhaust conduit 27, the supply conduit 26, and the atmosphere opening port of the pressure-responsive switching valve 8 are brought into conduction.

As a result, the compressed air for stopping is provided with the conduit 18, the hanger valve 3, the conduit 29, the pressure reducing valve 9, the conduit 30, the shuttle valve 10, the conduit 24, the delay valve 7, the conduit 25, and the pressure-responsive switching valve. 8 and the exhaust pipe 27, reverse injection is performed to the air turbine 11 which is rotating inertially, and the air turbine 11 is suddenly stopped. The air after injection is
It is discharged from the atmosphere opening port of the pressure-responsive switching valve 8 via the supply pipe line 26.

Example 2: 2 This example consists of the circuit diagrams shown in Figs. 3 and 4, and the pneumatic time limiter 12 of Example 1 is replaced by an electric time limiter.
13 and changed the delay valve 7 to the electromagnetic delay valve 7 ',
Further, a main stop valve 6b is added to the input side of the pressure reducing valve 9, and a separate conduit 19 for opening and closing the drive main valve 6a and the main stop valve 6b is provided by the hanger valve 3 for modification. is there.

That is, the pipeline branched from the driving compressed air pipeline 16
Reference numeral 19 denotes a connection to the drive port of the hanger valve 3 and a conduit further connected to the control ports of the drive main valve 6a and the stop main valve 6b.

Further, an electric delay device 13 composed of a switch 13a and a time switch 13b and an electromagnetic delay valve 7'are connected to the conduit 23b.

The electric timing device 13 starts the time switch 13b when the switch 13a detects the pressure of the compressed air in the drive pipe, and after the electromagnetic delay valve 7'is turned on for a certain time. It is a closed state.

Example 3: 3 This example is composed of the circuit diagrams shown in FIGS. 5 and 6, and the foot controller 4 and the electric timing device 13 of Example 2 are respectively used as a foot controller with flow rate adjustment 4'and pressure detection. The time delay device 14 is changed, and an auxiliary valve 5 is added to the drive pipe line.

That is, a foot controller with flow rate adjustment 4'is provided between the pipeline 17 and the pipeline 20, and the pipelines 20b and 20c branched from the pipeline 20 are respectively connected to the control port of the auxiliary valve 5 and the pressure detection time limit. Connected to the pressure detector 14a of the device 14,
Further, the pipe line 20a further ahead is connected to the drive port of the auxiliary valve 5.

The pressure detection type time limit device 14 includes a pressure detector 14a for detecting the pressure in the drive pipe from the pipe 20c, and the pressure detector 14 described above.
A control circuit 14b having amplification, calculation, comparison, and delay functions for controlling according to the detected value of a, and a motor (servo motor) for controlling the opening of the throttle valve by the operation amount from the control circuit 14b Is.

Further, the pressure detection type time limit device 14 sends back the stop compressed air necessary for suddenly stopping the air turbine 11 even when the rotation speed of the air turbine 11 is changed by the stepping pressure of the foot controller 4 '. The time is automatically controlled by detecting the air pressure on the output side of the foot controller with flow rate adjustment 4 '.

That is, when the air turbine 11 is rotating at a high speed, the pressure detection time limiter detects the compressed air for driving with high air pressure by the pressure detector 14a, and amplifies / calculates the detected value by the control circuit 14b. Comparison ・ After delaying for a certain period of time, the motor is controlled to reduce the opening of the throttle valve to lengthen the backward feeding time of the compressed air for stop, thereby effectively making the air turbine 11 that is inertially rotating rapidly. It's a stop. Further, when the air turbine 11 is rotating at a low speed, contrary to the case where the air turbine 11 is rotating at a high speed, the control circuit is controlled to increase the opening degree of the throttle valve, and the compressed air for stopping is sent backward. By shortening the time, the inertially rotating air turbine 11 is effectively stopped suddenly.

Example 4: 4 This example comprises the circuit diagrams shown in FIG. 7 and FIG. 8, and the foot controller with flow rate adjustment 4 ′ and the pressure detection type timing device 14 of Example 3 are respectively depressed at different depression angles (stepping amounts). ) A foot controller 4 ″ with a detector and a stepping angle (stepping amount) detecting time limiter 15 are changed.

The stepping angle (stepping amount) detection type timing device 15 detects the pedaling angle (stepping amount) of the foot controller 4 ″ with the stepping angle (stepping amount) detector by the rotary sliding resistance (stepping amount). ) Amplification / computation that controls according to the detection values of the detector 15a and the depression angle (depression amount) detector 15a
Control circuit 15b having the comparison / delay function and the control circuit 1
It is composed of a motor (servo motor) that controls the opening of the throttle valve by the operation amount from 5b.

Then, the stepping angle (stepping amount) detection type time limit device 15 is
Even when the rotation speed of the air turbine 11 is changed by stepping on the foot controller 4 ″ with the stepping angle (stepping amount) detector, the back-feeding time of the compressed air for stopping necessary to suddenly stop the air turbine 11 is set. The foot controller 4 ″ with the stepping angle (stepping amount) detector is automatically controlled by detecting the stepping angle (stepping amount).

That is, when the air turbine 11 is rotating at a high speed, the stepping angle (stepping amount) detecting type timing device 15 detects a large stepping angle (stepping amount) by detecting the stepping angle (stepping amount) 15.
The control circuit 15b amplifies, calculates, compares, and delays this detected value for a fixed time, and then controls the motor to reduce the opening of the throttle valve to reduce the reverse feed time of the compressed air for stop. By making the length longer, the air turbine 11 rotating inertially can be effectively stopped suddenly. Further, when the air turbine 11 is rotating at a low speed, the control circuit 15b controls the opening degree of the throttle valve so as to be larger than that at the time when rotating at a high speed, and reverses the compressed air for stopping. By shortening the feeding time, the air turbine 11 rotating by inertia can be effectively stopped suddenly.

(Effects of the Invention) As described in detail in the above embodiments, the rapid stop device for a dental air turbine handpiece according to the present invention does not require a long exhaust pipe line as in the prior art, but has only one drive compressed air pipe. Since the passage is used, a pressure loss due to air resistance does not occur unlike in the exhaust pipe, and the air turbine can be rotated at a high speed during a tooth cutting operation.

Further, since one compressed air line for driving is used for the flexible hose connecting the inside of the dental unit main body and the dental air turbine handpiece, the diameter of the flexible hose is thin, the weight is light, and the bend is small. The workability is improved and the operability during tooth cutting work is improved.

Furthermore, even in a sudden stop device that uses a foot controller with flow rate adjustment, by using a timed device that automatically detects and controls the pressure of driving air or the stepping angle (stepping amount) of the foot controller with flow rate adjustment, The air turbine can be effectively stopped suddenly in response to the fluctuation of the compressed air pressure for use.

As described above, the present invention has novel and excellent effects.

[Brief description of drawings]

1 and 2 are circuit diagrams showing the operating state of compressed air when the dental air turbine handpiece of the first embodiment of the present invention is used and when it is suddenly stopped, and FIGS. 3 and 4 show examples. Circuit diagrams showing the operating state of compressed air at the time of using the two-unit dental air turbine handpiece and at the time of sudden stop are shown in FIGS. 5 and 6 at the time of using the third-unit dental air turbine handpiece and FIG. 7 and FIG. 8 are circuit diagrams showing the operating state of compressed air at the time of sudden stop, and FIG. 7 and FIG. 8 are circuit diagrams showing the operating state of compressed air at the time of using the dental air turbine handpiece of the fourth embodiment device and during the sudden stop. Is. 1: Dental air turbine handpiece 2: Compressed air source, 3: Hanger valve 4: Foot controller 4 ': Foot controller with flow rate adjustment 4 ": Foot controller with stepping detector 5: Auxiliary valve, 6a: Main for driving Valve 6b: Stop main valve, 7: Delay valve 7 ': Solenoid delay valve 8: Set pressure responsive switching valve 8a: Check valve, 8b: Throttle valve 8': Joint part, 9: Pressure reducing valve 10: Shuttle valve , 11: Air turbine 12: Pneumatic time device, 12a: Check valve 12a: Throttle valve, 13: Electric time device 13a: Switch, 13b: Time switch 14: Pressure detection time device 14a: Pressure detector, 14b : Control circuit 15: Stepping angle detection type time limiter 15a: Stepping angle detector, 15b: Control circuit 18: Branching pipeline for stop 16 to 30: Pipeline (however, pipelines include a and b) 23b : Branch line for timed device 26: Supply line, 27: Exhaust line 28: Atmosphere opening port

Claims (6)

[Claims] 1. An air supply to an output side of a shuttle valve provided in a dental unit main body and an air turbine provided directly at a base end of a dental air turbine handpiece or in a joint part is reversed in a normal direction. And a set pressure responsive switching valve for connecting the compressed air source and the shuttle valve in the dental unit body with an on-off valve. An abrupt stop device for a dental air turbine handpiece, which is configured to be connected by two compressed air pipelines, a compressed air pipeline for driving and a compressed air pipeline for stopping having a pressure reducing valve. 2. A set pressure responsive switching valve is configured such that a sub valve thereof is provided with a check valve which opens by inputting compressed air having a pressure equal to or higher than a set pressure and a throttle valve which communicates with an atmosphere opening port. A quick stop device for a dental air turbine handpiece according to claim 1. 3. The air supply to the output side of the shuttle valve provided in the dental unit main body and to the air turbine provided directly at the base end of the dental air turbine handpiece or in the joint is reversed. And a set pressure responsive switching valve for connecting the compressed air source in the dental unit main body and the shuttle valve with a flow rate control, by connecting the set pressure responsive switching valve for 2 a drive compressed air pipeline having a valve and a stop compressed air pipeline having a pressure reducing valve
A device for sudden stop of a dental air turbine handpiece, which is connected by a compressed air line of a book, and is provided with a control circuit for detecting and controlling information from the on-off valve with flow rate adjustment in the time limiter. 4. A timing device, a pressure detector for detecting the pressure in a driving pipe, a control circuit having an amplification / calculation / comparison / delay function for controlling according to a detection value of the pressure detector, and the control. The sudden stop device for a dental air turbine handpiece according to claim 3, wherein the sudden air stop device comprises a motor that controls the opening of the throttle valve according to the operation amount from the circuit. 5. A timing device comprising an angle detector for detecting a displacement of a petal stepping angle of a foot controller, which is an on-off valve with flow rate adjustment, and an amplification / calculation / comparison / control which is controlled according to a detection value of the angle detector. 4. The dental air turbine handpiece according to claim 3, comprising a control circuit having a delay function and a motor for controlling the opening of the throttle valve according to the operation amount from the control circuit. Stop device. 6. A set pressure responsive switching valve is configured such that a sub valve thereof is provided with a check valve which opens by inputting compressed air having a pressure equal to or higher than a set pressure and a throttle valve which communicates with an atmosphere opening port. An abrupt stop device for a dental air turbine handpiece according to any one of claims 3 to 5, which is characterized.