JPH0755404A - Measuring equipment - Google Patents

Abstract

PURPOSE:To prevent a probe from fluctuating abruptly in the measuring direction. CONSTITUTION:A solenoid valve 46 is switched to retract side 46A thus feeding compressed air into the right chamber 34B of a spring biased single-acting cylinder 34 through a flow regulation valve 52 equipped with a check valve. Consequently, a rod section 36 elongates to cause fluctuation of the filler 22 of a probe in the retracting direction. When the tiller 22 is inserted into a work 24 and the compressed air is fed into the left chamber 34A of the cylinder 34 by switching the solenoid valve 46 to the measuring side 46B, the rod section 36 contracts to cause fluctuation of the filter 22 in the measuring direction due to the urging force of a measuring spring 40 thus bringing a contact 26 into contact with the inner diametral section 24A. When the compressed air is fed into the left chamber 34A, the air in the right chamber 34B is discharged through a flow regulation valve 52B of the flow regulation valve 42 and thereby the air flow is reduced as compared with the left chamber 34A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device, and more particularly to a measuring device for measuring the inner and outer diameters of a work and the size of a moving work.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view of a conventional inner diameter measuring type sizing device using double-acting cylinders 1, 1. According to this measuring device, when compressed air is supplied from the air compressor 2 to the right chambers 1A and 1A of the double-acting cylinders 1 and 1, the rod portions 3 and 3 are respectively extended and L-shaped probe (hereinafter, By pressing the base end portions 4A and 4A of the "feelers" 4 and 4, the feelers 4 and 4 swing in the retract direction, that is, in the direction in which they do not collide with the work 6, with the fulcrums 5 and 5 as swing fulcrums.

The feelers 4 and 4 in the retracted state
After inserting into the inner diameter portion 6A of the work 6, the solenoid valve 7 is switched to supply the compressed air to the left chambers 1B and 1B of the double-acting cylinders 1 and 1, and the rod portions 3 and 3 contract to cause the feeler 4, 4 swings in the measuring direction with the fulcrums of the measuring springs 8 and 8 using the fulcrums 5 and 5 as swing fulcrums, and the contacts 9 and 9 fixed to the tips of the feelers 4 and 4 come into contact with the inner diameter portion 6A. To do. The size of the inner diameter portion 6A of the work 6 is measured based on the output signal from the differential transformer 10 generated based on the positions of the feelers 4 and 4 at this time.

However, in the measuring device using the double-acting cylinder 1, if compressed air leaks or the air compressor 2 stops during use, the feelers 4, 4 are measured by the urging force of the measuring springs 8, 8. Since it swings in the direction, the feelers 4, 4 collide with the work 6 when the feelers 4, 4 are inserted into the inner diameter portion 6A of the work 6.

In order to solve such a problem, instead of the double-acting cylinder 1, a measuring device using a single-acting cylinder with a spring 11 shown in FIG. 4 is used. According to this measuring device, even if compressed air leaks or the air compressor 2 stops during use, the feelers 4, 4
Is oscillated in the retract direction against the urging force of the measuring springs 8 and 8 by the urging force of the springs 12 and 12 provided in the single-acting cylinders 11 and 11 with springs. Does not collide with the work 6.

[0006]

The conventional measuring device using the single-acting cylinder with a spring 11 does not want to damage the work 6, so it is used at a pressure as low as possible. When used in, the operation may become unstable due to temperature changes and changes in the lubrication state. When used in such a state, the rod portion 3 with respect to the cylinder 11
If the sliding resistance of the cylinder 11 changes with temperature and exceeds the predetermined value, the rod portion 3 does not contract smoothly even if compressed air is supplied to the left chamber 11A of the cylinder 11, and the left chamber 1
When the atmospheric pressure in 1A increases, the rod portion 3 may suddenly contract against the sliding resistance and the biasing force of the spring 12. In such a case, the feelers 4 and 4 swing rapidly in the measuring direction, so that the contact points 9 and 9 are attached to the inner diameter portion 6 of the work 6.
There is a drawback that it collides with A and damages the probe 9 and the inner diameter portion 6A.

The present invention has been made in view of such circumstances, and controls the extension speed or the contraction speed of the rod portion of a single-acting cylinder with a spring to prevent the probe from abruptly swinging in the measuring direction. In addition, even when the air supply from the air compressor is stopped, the stylus oscillates in the retract direction, thus preventing accidents such as breakage of the stylus and damage to the work. An object of the present invention is to provide a measuring device capable of performing the measurement.

[0008]

In order to achieve the above-mentioned object, the present invention provides a measuring element which is swingably provided in a main body in a measuring direction and a retracting direction, and a measuring element which is provided in the main body. A biasing means for biasing in the measurement direction and a spring-equipped single-acting cylinder which is provided in the main body and operates by supplying / stopping compressed air from a compressed air source are provided, and compressed air is supplied to the spring-actuated single-acting cylinder. When supplied, the rod portion of the spring-equipped single-acting cylinder moves in a direction away from the measuring element, the measuring element swings in the measuring direction by the urging force of the urging means, and the supply of the compressed air is stopped. , The urging force of a spring provided in a single-acting cylinder with a spring moves the rod portion in a direction to press the measuring element, whereby the measuring element oscillates in the retract direction against the urging force of the urging means. Moving measuring device In the single-acting cylinder with spring, an exhaust system passage provided with an air amount restricting member is provided, and the exhaust amount exhausted from the single-acting cylinder with spring by the supply of the compressed air is smaller than the supply amount of the compressed air. It is characterized by reducing the number.

[0009]

According to the present invention, an exhaust system passage is provided in a single acting cylinder with a spring, and an air amount throttle member is provided in this exhaust system passage,
The amount of exhaust air exhausted from the single-acting cylinder with spring by supplying compressed air is smaller than the amount of compressed air supplied from the compressed air source. As a result, the rod portion of the single-acting cylinder with spring is not affected by the sliding resistance with respect to the cylinder,
It expands and contracts due to the difference between the pressure of the compressed air in the single acting cylinder with spring and the pressure in the exhaust system passage. Therefore, since the extension speed or the contraction speed of the rod portion can be delicately controlled by adjusting the supply amount of the compressed air, it is possible to prevent the probe from swinging rapidly.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the measuring apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a sectional view of an inner diameter measuring type sizing device 20 to which the measuring device according to the present invention is applied. The sizing device 20 has a pair of feelers 22, 22 formed in an L-shape.
A contact 26 that is in contact with the inner diameter portion 24A of the work 24 is fixed to the tip portion 22A. Further, the feeler 22 has a central portion 22B connected to an arm 32 swingably supported by a fulcrum 30 provided in the main body 28 so that the main body 28 is measured in the measurement direction (the interval between the feelers 22, 22 is wide). Direction) and the retract direction (direction in which the interval between the feelers 22, 22 becomes narrower). Further, the feeler 22 has a base end portion 22.
C is a rod portion 36 of a single acting cylinder 34 with a spring, which will be described later.
It is brought into contact with the tip end portion 36A of the and is restricted in swinging.

On the other hand, a plate 38 is fixed to a substantially central portion of the arm 32, and the plate 38 is connected to the main body 28 via a measuring spring 40. Therefore,
The arm 32 is urged by the urging force of the measurement spring 40 indicated by an arrow A in the figure so as to swing the feeler 22 toward the measurement direction. As a result, the feeler 22 is pushed by the tip end portion 36A when the rod portion 36 of the spring-equipped single-action cylinder 34 is extended and swings in the retract direction,
When the rod portion 36 is contracted, it can be swung in the measuring direction by the urging force of the measuring spring 40.

The spring-equipped single-acting cylinder 34 is divided into a left chamber 34A, which is a moving range of the rod portion 36, and a right chamber 34B in which a spring 42 is installed. The left chamber 34A is connected to an air compressor 50 via a tube 44, a solenoid valve 46, and a pressure reducing valve 48. The right chamber 34B is connected to the air compressor 50 via a flow control valve 52 with a check valve, which is an air amount throttle member, a tube 54, a solenoid valve 46, and a pressure reducing valve 48.

Next, the sizing device 20 constructed as described above.
The action of will be described. First, the solenoid valve 46
As shown in FIG. 1, when the compressed air from the air compressor 50 is sent to the tube 54 by switching to the retract side 46A, the compressed air is supplied to the flow control valve 52 with the check valve.
It is supplied to the right chamber 34B of the single acting cylinder 34 with a spring via the check valve 52A. As a result, the rod portion 36 extends, so that the feeler 22 swings in the retract direction.

Next, the retractor 22 in the retracted state is inserted into the inner diameter portion 24A of the work 24. When the solenoid valve 46 is switched to the measurement side 46B and the compressed air is supplied to the left chamber 34A of the single-acting cylinder 34 with a spring through the tube 44, the rod portion 36 contracts and the feeler 22 causes the measurement spring 40 to move. The contact 26 swings in the measurement direction by the urging force of the contact 26 and the contact 26 contacts the inner diameter portion 24A. Based on the output signal from the differential transformer 56 (the differential transformer attached to the lower arm 32 is not shown) generated based on the position of the arm 32 at this time, the size of the inner diameter portion 24A of the work 24 is determined. To measure.

At this time, when compressed air is supplied to the left chamber 34A of the single-acting cylinder with spring 34, the air exhausted from the right chamber 34B passes through the flow rate adjusting valve 52B of the check valve with check valve 52B. The amount of compressed air supplied to the left chamber 34A is smaller than the amount of compressed air supplied to the left chamber 34A. As a result, the rod portion 36 moves to the left ventricle 34.
Since the contraction movement is caused by the difference between the pressure in A and the pressure in the right chamber 34B, the contraction operation is not affected by the sliding resistance with respect to the cylinder. Therefore, the contraction speed of the rod portion 36 can be delicately controlled by adjusting the amount of compressed air supplied into the left chamber 34A.
It is possible to prevent 2 from swinging rapidly in the measuring direction. That is,
The feeler 22 can be prevented from colliding with the inner diameter portion 24A of the work 24.

According to the sizing device 20 of this embodiment,
Even if compressed air leaks or the air compressor 50 stops during use, the feeler 22 is retracted by the biasing force of the spring 42 of the single-acting cylinder with spring 34 against the biasing force of the measuring spring 40. Since the feeler 22 does not collide with the work 24, the feeler 22 does not collide with the work 24. Figure 2
It is sectional drawing which shows the Example of the external measuring type sizing device 60 to which the measuring device which concerns on this invention is applied, The same code | symbol is attached | subjected about the same or similar member as the sizing device 20 shown in FIG. And explain.

The feeler 22 of the sizing device 60 is moved in the measurement direction (feeler 2
It is provided so as to be swingable in the retract direction (the direction in which the distance between the feelers 22 and 22 becomes wider) and in the retract direction (the direction in which the distance between the feelers 22 and 22 becomes wider). Further, the feeler 22 has a base end portion 22C having a rod portion 3 of the single acting cylinder 34 with a spring.
6 is abutted against the inner side surface 37 of the front end portion 36A of the nozzle 6, and swinging is restricted.

On the other hand, the plate 38 fixed to the arm 32 is connected to the main body 28 via a measuring spring 62. Therefore, the arm 32 is biased by the biasing force of the measurement spring 62 indicated by the arrow B so as to swing the feeler 22 in the measurement direction. As a result, the feeler 22 swings in the measurement direction by the urging force of the measuring spring 62 when the rod portion 36 of the single-acting cylinder with spring 34 is extended, and when the rod portion 36 contracts, the feeler 22 moves to the tip end portion 36A. It can be pulled and rocked in the retract direction.

The single-acting cylinder 34 with a spring has a left chamber 34A in which a spring 42 is installed in the moving range of the rod portion 36,
It is divided into the right chamber 34B. The left chamber 34A is connected to an air compressor 50 via a flow control valve 52 with a check valve, which is an air exhaust amount throttle member, a tube 44, a solenoid valve 46, and a pressure reducing valve 48. The right chamber 34B is connected to the air compressor 50 via a tube 54, a solenoid valve 46, and a pressure reducing valve 48.

Next, the sizing device 60 constructed as described above.
The action of will be described. First, the solenoid valve 46
2 is switched to the retract side 46A to send the compressed air from the air compressor 50 to the tube 44, the compressed air is supplied to the flow control valve 52 with a check valve.
It is supplied to the left chamber 34A of the single acting cylinder 34 with a spring through the check valve 52A. As a result, the rod portion 36 contracts, so that the feeler 22 swings in the retract direction.

Next, the feeler 22 in the retracted state is moved to the outside of the work 64. Then, the solenoid valve 46 is switched to the measurement side 46B, and the compressed air is passed through the tube 54 to the right chamber 34B of the single acting cylinder 34 with a spring.
, The feeler 22 swings in the measuring direction by the urging force of the measuring spring 62, and the contact 26 contacts the work 64.
Thereby, the outer dimensions of the work 64 can be measured.

At this time, when compressed air is supplied to the right chamber 34B of the single-acting cylinder with spring 34, the air exhausted from the left chamber 34A passes through the flow rate adjusting valve 52B of the check valve with check valve 52B. The amount of compressed air supplied to the right chamber 34B is smaller than the amount of compressed air supplied to the right chamber 34B. As a result, the rod portion 36 moves to the right chamber 34.
The contraction movement is caused by the difference between the pressure of the compressed air in B and the pressure in the left chamber 34A, so that the contraction operation is not affected by the sliding resistance with respect to the cylinder. Therefore, the right ventricle 34B
Since the extension speed of the rod portion 36 can be delicately controlled by adjusting the amount of compressed air supplied to the inside, the feeler 22 can be prevented from rapidly swinging in the measurement direction. That is, it is possible to prevent the feeler 22 from colliding with the work 64.

According to the sizing device 60 of this embodiment,
Even if compressed air leaks or the air compressor 50 stops during use, the feeler 22 is retracted by the biasing force of the spring 42 of the single-acting cylinder with spring 34 against the biasing force of the measuring spring 62. Since the feeler 22 does not collide with the work 64, the feeler 22 does not collide with the work 64. In this embodiment, the measuring device of the inner diameter measuring type and the measuring device of the outer shape measuring type are described, but the applicable range is not limited to this, and the height dimension of the work moving by the conveyor or the like can be determined. It can also be applied to measuring devices for measurement.

[0024]

As described above, according to the measuring device of the present invention, the exhaust system passage is provided in the single acting cylinder with spring,
An air amount throttle member is provided in this exhaust system passage to reduce the amount of exhaust air discharged from the spring-loaded single-acting cylinder to less than the amount of compressed air supplied from the compressed air source. , Is expanded and contracted by the difference between the pressure in the single-acting cylinder with spring and the pressure in the exhaust system passage without being affected by the sliding resistance with respect to the cylinder. Therefore, it is possible to delicately control the extension speed or the contraction speed of the rod portion, and thus it is possible to prevent the probe from swinging rapidly.
Moreover, even when the supply of air from the air compressor is stopped, the tracing stylus oscillates in the retract direction, so that it is possible to prevent an accident such as damage to the tracing stylus or damage to the work.

[Brief description of drawings]

FIG. 1 is a sectional view of an inner diameter measuring type sizing device to which a measuring device according to the present invention is applied.

FIG. 2 is a sectional view of a contour measuring type sizing device to which the measuring device according to the present invention is applied.

FIG. 3 is a sectional view of a conventional measuring device using a double-acting cylinder.

FIG. 4 is a sectional view of a conventional measuring device using a single-acting cylinder.

[Explanation of symbols]

 20, 60 ... Sizing device 22 ... Feeler 26 ... Contact 28 ... Main body 32 ... Arm 34 ... Spring single acting cylinder 36 ... Rod part 40, 62 ... Measuring spring 46 ... Solenoid valve 50 ... Air compressor 52 ... Check valve Flow control valve with

Claims (1)

[Claims] 1. A probe provided on the main body so as to be swingable in a measurement direction and a retract direction, an urging means provided on the main body for urging the probe in the measurement direction, and provided on the main body. A single-acting cylinder with a spring that operates by supplying / stopping compressed air from a compressed air source. When compressed air is supplied to the single-acting cylinder with a spring, the rod portion of the single-acting cylinder with a spring causes the measuring element to move. When the probe is moved in a direction away from, and the probe is oscillated in the measuring direction by the urging force of the urging means, and the supply of the compressed air is stopped, the urging force of the spring provided in the spring-equipped single-acting cylinder causes In a measuring device in which the rod moves in the retracting direction against the urging force of the urging means by the rod portion moving in the direction of pressing the probe, the air-operated cylinder with the spring Amount reduction part The exhaust system path provided with the exhaust amount which is exhausted from the spring with single-acting cylinders by the supply of the compressed air, the measuring device being characterized in that less than the supply amount of the compressed air.