JPH0650748A - Plastic container flange inspection device - Google Patents

Abstract

(57) [Summary] [Objective] Deformation of the flange portion of a container obtained by plastic molding, deviation of thickness, and average thickness can be performed mechanically accurately and efficiently. [Structure] Main air cylinder 2, sub air cylinder 4 fixed vertically downward to an operating rod 3 of main air cylinder 2, and sub air cylinder 4
The movable holding member 7 is slidable in the vertical direction with respect to the operating rod 5 and can be tilted at a predetermined swing angle in the vertical direction so as to be suspended and supported in the horizontal posture. At least two detection plates 9 are provided on the outer side of the movable pressing member 7 as a pair, and a plastic for detecting a difference in separation distance between each pair of the displacement detector 8 and the detection plate 9. Container flange inspection device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for inspecting deformation of a flange portion in an opening portion of a plastic container molded by an injection molding method or a sheet molding method, and an uneven state of thickness, or an average value. The present invention relates to a plastic container flange inspection device.

[0002]

2. Description of the Related Art Most conventional plastic container flanges are visually inspected. When measuring the amount of deformation of the flange or measuring the thickness,
Since it is difficult to measure the thickness by 100% container inspection,
It is common to use both sampling inspection and visual inspection.

[0003]

By the way, when deformation occurs in the flange portion of the opening of the molded plastic container, the lid (resin-made film) along the flange portion impairs the external appearance of the container. It has been pointed out that it is difficult to heat, pressurize, hermetically seal and process the contents, it is difficult to fill the contents, and there is a possibility that the metal lid along the flange portion may not be tightened properly.

Further, when the thickness of the flange portion after molding is not appropriate or uneven, the sealing pressure unevenness occurs in the heating / pressurizing sealing process of the lid. There is a possibility that a sealing failure may occur or a metal lid may not be tightly wound.

According to the present invention, the deviation of the thickness of the flange portion of the container obtained by plastic molding and the average value of the thickness are obtained, and the deformation state of the flange portion can be inspected mechanically accurately and efficiently. To be able to carry out.

[0006]

The first invention of the present invention is as follows:
Via the main air cylinder 2, the sub air cylinder 4 fixed and supported vertically downward by the operating rod 3 of the main air cylinder 2, and the universal joint 6a having a slight clearance with respect to the operating rod 5 of the sub air cylinder 4. A vertical support shaft 6 which is vertically suspended and slightly tilted, and a movable holding member which is vertically supported so as to be slidable along the vertical support shaft 6 so as to maintain a horizontal posture by its own weight. 7, a displacement detector 8 is provided on the horizontal mounting table 1, and at least two or more pairs of detection plates 9 are integrally provided on the outer side of the movable holding member 7 as a pair, and mounted on a fixed position of the horizontal mounting table 1. The pressing member 7 is brought into contact with or pressed against the flange portion 11 of the placed plastic container 10 to make a pair of displacement detectors 8
It is a plastic container flange part inspection device characterized by detecting the difference or / and the average value of the respective separation distances between and the detection plate 9.

The second aspect of the present invention is to provide a main air cylinder 2, a sub air cylinder 4 fixed vertically downward to the operating rod 3 of the main air cylinder 2, and an operating rod 5 of the sub air cylinder 4. A vertical support shaft 6 slidably supported in the vertical direction and a universal joint 6a having a small clearance at the lower end of the vertical support shaft 6 so as to be suspended and supported so as to maintain a horizontal posture by its own weight. Is provided with a movable pressing member 7 which can be freely tilted, and a displacement detector 8 is provided on the horizontal mounting table 1 and a plate 9 to be detected is integrally provided on the outer side of the movable pressing member 7 in a pair.
As a set, at least two sets or more are provided, and the pressing member 7 is brought into contact with or pressed against the flange portion 11 of the plastic container 10 placed at a fixed position of the horizontal mounting table 1 to make a pair of displacement detectors 8 It is a plastic container flange part inspection device characterized by detecting the difference or / and the average value of the respective separation distances between and the detection plate 9.

The third invention of the present invention is that the main air cylinder 2, the sub air cylinder 4 fixed vertically downward to the operating rod 3 of the main air cylinder 2, and the operating rod 5 of the sub air cylinder 4. And a vertical support shaft 6 fixedly supported on the vertical support shaft 6 so as to be vertically slidable along the vertical support shaft 6 and having a slight clearance with respect to the vertical support shaft 6 so as to maintain a horizontal posture with its own weight. And a movable holding member 7 which is hung and supported by the movable holding member 7 and which can be tilted slightly. The flange portion 11 of the plastic container 10 provided in two or more sets and placed at a fixed position on the horizontal placing table 1.
With respect to the above, the pressing member 7 is contacted or pressed to detect the difference or / and the average value of the separation distances between the pair of displacement detectors 8 and the detection plate 9. It is a plastic container flange inspection device.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the plastic container flange portion inspection device of the first invention of the present invention will be described in detail with reference to FIG. 1. A horizontal mounting table 1 for mounting a plastic container 10 at a fixed position, and Main air cylinder 2 fixed and supported vertically downward on a stand 1 and capable of extending and shortening
And a sub air cylinder 4 fixed and supported vertically downward on the operating rod 3 of the main air cylinder 2 and a vertical joint by the weight of the operating rod 5 of the sub air cylinder 4 via a universal joint 6a having a slight clearance. And a vertical support shaft 6 which is hung and supported so as to hold, and is tiltable with a slight swing angle.

A plastic container 10 is slidably supported by the vertical support shaft 6 slidably, and is placed directly above the flange portion 11 of the plastic container 10 placed at a fixed position on the horizontal mounting table 1 and is spaced apart from the main air cylinder 2 and the sub-portion. Air cylinder 4
The movable pressing member 7 that comes into contact with or presses against the flange portion 11 by the extension operation of 1.

Displacement detectors 8 are provided on the horizontal mounting table 1, and at least two sets of detection plates 9 are provided on the outer side of the movable pressing member 7 in pairs, one pair at a time. The deformed state and the uneven thickness state of the flange portion 11 are inspected by detecting the difference in the separation distance from the plate 9.

The horizontal mounting table 1 is provided with a projecting fixing portion 1a for mounting and fixing the molded plastic container 10 (inspection object) at a fixed position, and the outer periphery of the fixing portion 1a is the plastic container 10 It is tightly fitted and fixed to the inner circumference of the opening 10a.

Support frames F, F are erected at both outer ends of the horizontal mounting table 1, and a support frame F ₁ is horizontally installed above the support frames F.

A main air cylinder 2 is attached and fixed to the upper side of the support frame F ₁ with its operating rod 3 oriented vertically downward.

A sub air cylinder 4 is attached and fixed to the downward tip of the operating rod 3 with the operating rod 5 vertically downward.

Incidentally, G ₁ is a guide shaft mounted vertically downward on the support frame F ₁ , and G ₂ is a guide follower integrally mounted on the sub air cylinder 4, which is vertically moved by the main air cylinder 2. This is a guide for vertically guiding the moving direction of the sub air cylinder 4.

Actuating rod 5 of the sub air cylinder 4
A vertical support shaft 6 is attached and fixed downward to the downward tip end via a universal joint portion 6a integrally connected to the vertical support shaft 6. The lower end of the vertical support shaft 6 is wider than the outer diameter of the support shaft 6. The vertical support shaft 6 is provided with a locking portion 6b.
It is possible to take an inclined posture with a predetermined allowable swing angle (for example, about ± 0.5 ° to ± 5 ° with 0 ° in the vertical direction) about the universal joint 6a. The universal joint 6a will be described later in detail with reference to FIG.

The holding member 7 is slidably inserted into the vertical support shaft 6 along the support shaft 6 for a predetermined stroke length, and is supported by the support shaft 6 in a suspended state in a horizontal state.

As shown in one embodiment of FIG. 1, the pressing member 7 has an overall shape such as a cylindrical shape with a lower end opened, or a shape in which a bowl-shaped container is laid down.
An upper support plate 7b is provided in the upper portion, and a circular hole portion 7a into which the vertical support shaft 6 is fitted is formed at a position of the support plate 7b that intersects the gravity center line of the pressing member 7. .

The lower end of the pressing member 7 is open, and the main body of the plastic container 10 mounted and fixed on the horizontal mounting table 1 can be loaded in the pressing member 7.

The lower end portion 7c of the side wall of the pressing member 7 has its lower surface kept horizontal when it is suspended from the vertical support shaft 6, and the plastic container 10 facing the lower end portion 7c thereof faces downward. The flange portion 11 is provided with facing surfaces that face each other around the entire circumference, or the flange portion 11 is equally spaced so that two or more partial circumferential surfaces facing each other can be appropriately pressed in the entire circumference of the flange portion 11. Alternatively, it has a comb-like shape with unequal intervals. The pressing member 7 does not necessarily have a tubular shape or a bowl-like shape, and may be a plate-shaped frame, a rod-shaped frame, or the like.

On the outer side of the pressing member 7 suspended in a horizontal state, a plate 9 made of metal, synthetic resin or the like is horizontally arranged at a portion corresponding to a horizontal line H passing through the center of the sphere 6c of the universal joint 6a. It is attached and the detected plate 9
Are attached to at least a total of two outer surfaces of the pressing member 7 facing the vertical support shaft 6 at a total of two positions, or three or more outer surfaces of the pressing member 7, and the horizontal mounting table 1 directly below the plate 9 to be detected faces upward. The displacement detector 8 is installed so as to have a detection sensitivity.

As the displacement detector 8, for example, a visible light laser type displacement sensor can be used. The laser light emitted from the detector 8 is reflected by the plate 9 to be inspected and the reflected light is detected by the detector. It is detected by an optical sensor attached to the 8. In addition to this, it is also possible to use an ultrasonic displacement sensor, a magnetic displacement sensor, or the like.

The above is the plastic container flange inspection device according to one embodiment of the first invention, and the main air cylinder 2 is lowered by a predetermined stroke length to lower the pressing member 7. The lower end portion 7c is operated to bring it into contact with the flange portion 11 of the plastic container 10 positioned and fixed on the horizontal mounting table 1 and slide the pressing member 7 relatively along the vertical support shaft 6, The suspended state of the pressing member 7 is released, the flange portion 11 is pressed by the weight of the pressing member 7, and the deformed state of the flange portion 11 is inspected.

The sub air cylinder 4 is lowered by a predetermined stroke length to press the upper support plate 7b upper side of the pressing member 7 with the lower portion of the universal joint 6a, and the lower end of the pressing member 7. Part 7
c is pressed against the flange portion 11 to move the flange portion 11
Is to check the unevenness of the thickness.

FIG. 2 is a side sectional view for explaining the details of the universal joint 6a and the vertical support shaft 6 which connect the sub air cylinder 4 and the pressing member 7 in the first invention, and FIG. As shown in FIG. 5, the universal joint 6a attached to the tip of the operating rod 5 of the sub air cylinder 4 has a vertical support shaft 6 at the bottom thereof.
The spherical body 6c provided at the upper end of the is slidably fitted and held on a surface wider than the hemispherical surface, and when the vertical support shaft 6 is 0 ° in the vertical direction about the spherical body 6c, ± 0.1
It can be tilted at a swing angle θ of about ± 5 °, and the posture of the joint body 6a can be freely changed within the range of the swing angle.

In the movable pressing member 7, the vertical support shaft 6 is inserted into the hole portion 7a formed in the upper support plate 7b, and the vertical support shaft 6 is inserted.
At the lower end, a wide portion 6b having a diameter larger than the inner diameter of the hole 7a is formed.
By being provided, the vertical support shaft 6 is vertically suspended and supported, and the movable pressing member 7 is slidable in the vertical direction along the support shaft 6.

On the lower side of the universal joint 6a,
The spherical body 6c is provided with a partial spherical body convex surface 6d that is concentric with the center, and the upper support plate 7b of the pressing member 7 facing the partial spherical body convex surface 6d is provided with a concave surface 7c that fits with the convex surface 6d.

FIG. 2B shows a state in which the sub air cylinder 4 is moved down and the upper side of the upper support plate 7b of the pressing member 7 is pressed by the lower side of the universal joint 6a. In the above, the convex surface 6d of the universal joint 6a and the concave surface 7c of the upper support plate 7b of the pressing member 7 are fitted to each other, and the pressing member 7 is tilted in a predetermined swing angle range about the spherical body 6c. Can be taken.

As shown in FIG. 2 (c), the wide width portion 6b at the lower end of the vertical support shaft 6 has a taper portion 6k at the upper portion thereof.
And a tapered portion 7d having a shape that fits with the tapered portion 6k around the hole 7a on the lower surface of the upper support plate 7a of the movable pressing member 7. You may make it provide the centering means which aligns with the hole center 7a inner diameter center of 7.

Further, in order to prevent the movable pressing member 7 from rotating about the vertical support shaft 6 in the horizontal plane, a projection portion which fits with each other at a position where the taper portions 6k and 7d are aligned and overlapped with each other, or a loose portion. You may make it provide a raised part.

Next, the operation of the plastic container flange inspection device of the present invention will be described with reference to FIG. First, the main air cylinder 2 is started, and its operating rod 3
By lowering the holding member 7 toward the horizontal mounting table 1 to bring the lower end portion 7c of the holding member 7 into contact with the flange portion 11 of the plastic container 10 and the holding member 7 by its own weight. The main air cylinder 2 is stopped while the portion 11 is being pressed, and the lowering of the pressing member 7 is stopped.

For example, when the lower end portion 7c of the pressing member 7 presses the flange portion 11 by its own weight, they face each other.
Signal data corresponding to the separation distances D ₁ and D ₂ between the displacement detector 8 and the plate 9 to be detected are detected by using the detection signals obtained by the displacement detectors 8 and 8 detecting the plates 9 and 9 to be detected. The deformation state or / and the average thickness of the flange portion 11 is inspected.

For example, in the flange portion 11 of the molded plastic container 10, if there is no deformation such as waviness at any portion pressed by the lower end portion 7c,
The flange portion 11 has no height difference, the detected plates 9 and 9 are maintained in a horizontal state, and the distances D ₁ and D ₂ between the displacement detector 8 and the detected plate 9 at the respective positions are D ₁ = D _2, and the separation distance difference (D ₁ −D ₂ ) = S (absolute value)
Becomes S = 0. Further, the average value of the thickness of the flange portion 11 is obtained by (D ₁ + D ₂ ) / 2 = X (average value).

Also, for example, the molded plastic container 1
When the flange portion 0 of 0 has a deformation such as waviness at any place pressed by the lower end portion 7c, there is no height difference in the flange portion 11 and the detected plates 9 and 9 are slightly Inclination occurs, and a separation distance difference (D ₁ −D ₂ ) = S (absolute value) is generated in the separation distances D ₁ and D ₂ between the displacement detector 8 and the plate 9 to be detected at each position. Is.
Also, the average value of the thickness of the flange portion 11 is (D ₁ + D ₂ ).
/ 2 = X (average value).

FIG. 3 is a series of operation circuit diagrams in the plastic container flange inspection apparatus of the present invention, where is a start operation circuit for turning on the start switch SW to operate the relay Ry1, and is a relay switch Ry1s depending on the operation of the relay Ry1. Close the main air cylinder 2
Of the solenoid valve operation solenoid SOL1 for supplying the expansion operation air to start the lowering operation of the main air cylinder 2 for inspecting the deformed state of the flange portion 11, an operation start operation circuit,
Is OFF-DER when the relay switch Ry1s is closed.
By operating the AY timer T1 and opening the timer switch (not shown) to close the solenoid valve for air supply (not shown) after a lapse of a predetermined time to stop the extension operation of the main air cylinder 2. , A circuit for setting the extension amount of the main air cylinder 2 for setting the stroke length (extension amount), operates the ON-DELAY timer T2 by closing and closing the relay switch Ry1s, and extends the sub air cylinder 4 after a predetermined time has elapsed. ON-DELAY timer T2 is the start time setting circuit for the inspection of the deviation of the flange thickness to be operated or / and the average thickness condition inspection.
After this, the circuit that closes the timer switch T2s and operates the relay Ry2 after a lapse of a predetermined time is
Ry2s is closed and closed by the operation of y2, the solenoid valve operation solenoid SOL2 of the sub air cylinder 4 is operated, and the expansion operation air is supplied, and the sub air cylinder 4 starts the descending operation. Inspection start operation circuit for thick condition, is relay switch Ry
The OFF-DELAY timer T3 is activated by closing and closing for 2s, and a timer switch (not shown) is activated after a predetermined time has elapsed.
Is opened to close the air supply solenoid valve (not shown) to stop the extension operation of the sub air cylinder 4, and a circuit for setting the extension amount of the sub air cylinder 4 is a relay switch Ry2s. ON-DE that works
The circuit that operates the RAY timer T4 is ON-DE
This is an operation end circuit for closing the timer switch T4s and operating the relay Ry3 after a predetermined time has passed by the operation of the RAY timer T4. The relay switch Ry3s is opened by the operation of the relay Ry3, and the relay switch Ry1s, By turning off Ry2s, the solenoid valve operation solenoids SOL1 and SOL2 are switched to supply shortening operation air to the main air cylinder 2 and the sub air cylinder 4, and the cylinders 2 and 4 are supplied.
Is raised and the inspection operation for one cycle is completed.

FIG. 4 is a pneumatic circuit diagram of an embodiment of the plastic container flange inspection device of the present invention.
Reference numeral 0 is a main supply path for compressed air, 20a is a main air supply amount adjusting valve, 21 is an air supply path to the main air cylinder 2, 21a is an air supply opening / closing valve, 22 is an air supply path to the sub air cylinder 4, and 22a. Is an air supply on-off valve, 23 and 24 are solenoid valves for switching extension / shortening operation air supply, 25 is an extension operation air supply path of the main air cylinder 2, 26 is a shortening operation air supply path of the main air cylinder 2, and 27 is a sub Air cylinder 4
Extension operation air supply path, 28 is a shortening operation air supply path for the sub air cylinder 4, 29, 30, 31, 32 are air supply check valves, 33 is an expansion operation air supply path for the main air cylinder 2, and 34 is a main Shortening operation air supply path of the air cylinder 2, 35 is an extension operation air supply path of the sub air cylinder 4, 36 is a shortening operation air supply path of the sub air cylinder 4, 37 and 38 are air discharge paths of the main air cylinder 2, respectively. 39, 40
Are the air discharge passages 4 and 4 of the sub air cylinder 4, respectively.
1, 42, 43, 44 are air discharge check valves, 45, 4
Reference numerals 6, 47 and 48 are air discharge opening / closing valves.

Next, one embodiment of the plastic container flange inspection device of the second invention of the present invention will be described in detail below. The second aspect of the present invention is a horizontal mounting table 1 for mounting the plastic container 10 shown in FIG.
5, vertically slidable with respect to the operating rod 5 of the sub air cylinder 4 fixed vertically downward to the operating rod 3 of the main air cylinder 2 which is vertically supported fixed downward and capable of extending and shortening operation. A vertical support shaft 6 is attached to the vertical support shaft 6, and a movable holding member 7 is attached to the lower end of the vertical support shaft 6 so as to be tiltable.

The second invention will be described with reference to FIG.
A slide guide block 4a having a vertical guide hole 4b is fixedly supported on an operating rod 5 of the sub air cylinder 4, and a slide plate 6e vertically slidable along the vertical guide hole 4b is provided at an upper end portion thereof. The support shaft 6 is provided.

At the lower end of the vertical support shaft 6, a universal joint 6a having a slight clearance is used to vertically suspend and support the horizontal support by its own weight so that it can be tilted at a slight swing angle. In addition, the movable pressing member 7 is provided.

A plastic container 10 slidably supported by the slide guide block 4a in the vertical direction and mounted on the horizontal mounting table 1 shown in FIG. 1 at a fixed position.
A movable pressing member 7 is provided directly above the flange portion 11 and is opposed to the flange portion 11 and contacts or presses the flange portion 11 by the extension operation of the main air cylinder 2 and the sub air cylinder 4. (See Figure 1)

A displacement detector 8 is provided on the horizontal mounting table 1, and a pair of detection plates 9 are provided on the outer side of the movable pressing member 7 at a portion corresponding to a horizontal line H passing through the center of the sphere 6c of the universal joint 6a. As at least two sets, and inspects the deformed state and the uneven thickness state of the flange portion 11 by detecting the difference in the separation distance between each pair of the displacement detector 8 and the detection plate 9. Is.

The movable pressing member 7 is attached to the vertical support shaft 6 which is vertically slidable in the slide guide block 4a, and is freely slidable in the vertical direction along the slide guide block 4a by a predetermined stroke length. Moving.

The overall shape of the pressing member 7 is substantially the same as that of the first invention shown in FIG. 1, and it is not necessarily required to have a tubular shape or a bowl-like shape. It may be a rod-shaped frame or the like.

In FIG. 5, on the outer side of the pressing member 7 suspended in a horizontal state, a plate to be detected made of metal, synthetic resin or the like is provided at a portion corresponding to a horizontal line H passing through the center of the sphere 6c of the universal joint 6a. 9 (reflecting plate) is attached in the horizontal direction, and the displacement detector 8 is installed so as to face the plate 9 to be detected and have upward detection sensitivity as in the first aspect of the invention.

Next, one embodiment of the plastic container flange inspection device of the third invention of the present invention will be described in detail below with reference to FIG. In the third aspect of the invention, the operating rod 3 of the main air cylinder 2 that is vertically supported and fixed vertically above the horizontal mounting table 1 on which the plastic container 10 shown in FIG.
Sub air cylinder 4 fixed vertically downward to the
6 (a), a columnar vertical support shaft 6 is fixedly supported on the operating rod 5 of FIG.
A columnar narrow width portion 6f is provided between i and the lower end portion 6j,
The narrow width portion 6f of the vertical support shaft 6 has a tapered portion 6f.
g and 6h.

The narrow width portion 6f of the vertical support shaft 6 is freely fitted in the circular hole portion 7a formed in the upper support plate 7a of the movable holding member 7 with a slight clearance. Has been.

The upper support plate 7a of the movable pressing member 7
Tapered portions 7c and 7 that match the tapered portions 6g and 6h of the vertical support shaft 6 are provided around the holed portions 7a on the front and back sides.
and d.

It should be noted that, in order to prevent the movable pressing member 7 from rotating about the vertical support shaft 6 in a horizontal plane, a projection portion which fits with each other at a position where the taper portions 6h and 7d are aligned and overlapped with each other, or a loose portion. You may make it provide a raised part.

The movable pressing member 7 is slidable in the vertical direction along the narrow portion 6f, and the narrow portion 6 is also provided.
Due to the small clearance provided between f and the hole 7a, the movable pressing member 7 can be tilted at a slight angle with respect to all the horizontal directions with respect to the vertical support shaft 6, and The movable holding member 7 is in a state of not falling off from the vertical support shaft 6 by the wide width portions of the upper end portion 6i and the lower end portion 6j of the vertical support shaft 6 having a diameter larger than the inner diameter of the holed portion 7a. There is.

The movable holding member 7 is slidable in the vertical direction along the vertical narrow portion 6f by a stroke length corresponding to the length of the width portion 6f.

The movable pressing member 7 in the third invention.
At least two sets of detected plates 9 are provided on the outer side, for example, at a portion corresponding to a horizontal line K passing through the thickness center of the upper support part 7a as one pair, and at least two pairs of displacement detectors 8
By detecting the difference in the separation distance between the detection plate 9 and the detection plate 9, the deformed state and the uneven thickness state of the flange portion 11 are inspected.

The overall shape of the pressing member 7 in the third invention is substantially the same as that in the first invention shown in FIG. 1, and it is not necessarily required to be a tubular shape or a bowl shape. It may be a plate-shaped frame, a rod-shaped frame, or the like.

[0054]

The plastic container flange inspection apparatus according to the present invention comprises a sub air cylinder 4 fixed vertically downward to an operating rod 3 of a main air cylinder 2 and a vertical support attached to and supported by an operating rod 5 of the sub air cylinder 4. The shaft 6 is slidably supported by the vertical support shaft 6 so as to be slidably supported by the vertical support shaft 6 and is spaced directly above the flange portion 11 of the plastic container 10 placed at a fixed position on the horizontal mounting table 1 and the main air cylinder 2 and By the movable pressing member 7 that comes into contact with or presses the flange portion 11 by the extension operation of the sub air cylinder 4, the pressing member 7 is pressed against the flange portion 11 of the plastic container 10.
It is possible to realize a switching operation between the pressing operation by the self-weight of the air cylinder and the pressing operation by the pressing force of the air cylinder. Depending on the relatively light pressing operation by the self-weight of one side, the flatness of the flange portion 11 under relatively natural conditions, etc. The deformation state can be inspected, and the original thickness deviation state or the average thickness state in which the deformation of the flange portion 11 is eliminated can be inspected by the pressing operation by the other air cylinder.

Further, since the displacement detector 8 is provided on the horizontal mounting table 1 and at least two or more pairs of detection plates 9 are provided on the outer side of the movable holding member 7 as one pair, the flange portion 11 formed by the holding member 7 is provided. It is possible to detect the difference in the separation distance between the pair of displacement detectors 8 and the detection plate 9 during the pressing operation, and the deformation state of the flange portion 11 and the deviation of the thickness based on the difference amount. The condition and the average thickness condition can be inspected.

[0056]

The plastic container flange inspection apparatus of the present invention is a machine for checking the deformation of the flange portion of a container obtained by plastic molding, unevenness in thickness, and average thickness without relying on visual inspection as in the prior art. In addition to improving the inspection efficiency of the sampling inspection method, it is also possible to adopt the 100% inspection method, and the appearance of the flange part of the opening of the molded plastic container is improved. Stable quality, and it is difficult to heat and pressure seal the lid along the flange as in the past, it is difficult to fill the contents, and the metal lid winding process along the flange tends to be defective. The problem can be solved, and a remarkable effect can be obtained in the efficiency improvement and the quality improvement in the molding and filling process of the plastic container.

[Brief description of drawings]

FIG. 1 is a front view illustrating an embodiment of a plastic container flange portion inspection device according to a first aspect of the present invention.

FIG. 2 (a) is a front sectional view for explaining the connection structure between the sub air cylinder and the movable pressing member in the embodiment of the plastic container flange portion inspection device of the first invention. (B) It is a front sectional view for explaining the connection structure in a state in which the movable holding member is pressed by the sub air cylinder in one embodiment of the plastic container flange portion inspection device of the first invention. (C) It is a front sectional view for explaining the centering mechanism of the vertical support shaft in the embodiment of the plastic container flange portion inspection device of the first invention.

FIG. 3 is an example of a series of operation circuit diagrams of the plastic container flange inspection device of the present invention.

FIG. 4 is an example of a schematic diagram of a series of pneumatic systems of the plastic container flange inspection device of the present invention.

FIG. 5 is a partial front view illustrating an embodiment of the plastic container flange inspection device according to the second invention of the present invention.

FIG. 6 (a) is a partial front view illustrating an embodiment of the plastic container flange inspection device of the third invention of the present invention. (B) It is a partial front view explaining one Example of the plastic container flange inspection device of the 3rd invention in the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Horizontal mounting base 1a ... Positioning fixed protrusion 2 ... Main air cylinder 3 ... Operating rod 4 ... Sub air cylinder 5 ... Operating rod 6 ... Vertical support shaft 7 ... Pressing member 7a ... Upper support 8 ... Displacement detector
9 ... plate to be detected 10 ... plastic container 11 ... flange portion 21a, 22a ... air supply valve 23, 24 ... solenoid valve for switching expansion and contracting operation air supply D _1, D ₂ ... distance F, F ₁ ... supporting frame G ₁ … Guide shaft G ₂ … Guide follower H, K… Horizontal line

Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display area B29L 22:00 4F

Claims (3)

[Claims] 1. A main air cylinder 2, a sub air cylinder 4 fixed and supported vertically downward by an operating rod 3 of the main air cylinder 2, and a small clearance with respect to an operating rod 5 of the sub air cylinder 4. A vertical support shaft 6 which is suspended and supported in a vertical direction through a universal joint 6a and which is slightly tiltable, and a vertical support shaft 6 which is slidable along the vertical support shaft 6 and vertically suspended so as to maintain a horizontal posture with its own weight. The horizontal mounting table 1 is provided with at least two sets of displacement detectors 8 on the horizontal mounting table 1, and detection plates 9 integrally formed on the outer side of the movable pressing member 7 as a pair. The pressing member 7 is brought into contact with or pressed against the flange portion 11 of the plastic container 10 placed at the fixed position to detect the pair of displacement detectors 8 and the pair of displacement detectors 8. Plastic container flange portion inspection apparatus characterized by detecting the respective difference distance and / or the mean value between the plate 9. 2. A main air cylinder 2, a sub air cylinder 4 fixed vertically downward to the operating rod 3 of the main air cylinder 2, and an operating rod 5 of the sub air cylinder 4 slidably supported in the vertical direction. A vertical support shaft 6 and a movable pressing member 7 which is suspended and supported so as to maintain a horizontal posture by its own weight through a universal joint 6a having a small clearance at a lower end portion of the vertical support shaft 6, and a slightly tiltable movable holding member 7. The horizontal mounting table 1 is provided with a displacement detector 8 and at least two sets of detection plates 9 are integrally provided on the outer side of the movable holding member 7 as a pair, and placed at a fixed position on the horizontal mounting table 1. The pressing member 7 is brought into contact with or pressed against the flange portion 11 of the plastic container 10 to separate each pair of the displacement detector 8 and the detection plate 9 from each other. Distance difference or / and plastic containers flange portion inspection apparatus characterized by detecting the average value. 3. A main air cylinder 2, a sub air cylinder 4 fixed vertically downward to an operating rod 3 of the main air cylinder 2, and a vertical support shaft 6 fixedly supported to an operating rod 5 of the sub air cylinder 4. , Vertically slidable along the vertical support shaft 6 and having a small clearance with respect to the vertical support shaft 6 so as to maintain a horizontal posture with its own weight, suspended vertically and slightly inclined A horizontal mounting table 1 provided with a freely movable holding member 7.
The displacement detector 8 and the movable holding member 7 are integrally provided on the outer side thereof with at least two pairs of plates 9 to be detected, and a flange portion 11 of a plastic container 10 placed at a fixed position on the horizontal placing table 1. With respect to the above, the pressing member 7 is contacted or pressed to detect the difference or / and the average value of the separation distances between the pair of displacement detectors 8 and the detection plate 9. Plastic container flange inspection device.