JPH0464929B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a detection device for detecting whether the sealing state of a relatively flexible package such as a bag of powder or granular material is good or bad.

For packaging products made of synthetic resin, metal foil, or a film laminated with these materials, folded into a rectangular shape, sealed on two sides, and sealed on the remaining side after filling the contents, or trays made of the above materials. Packaging products in which the upper part is sealed with various films after filling the contents are easy to package and can be processed in large quantities at low cost, so they are widely used in packaging various foods, medicines, and the like.

However, on the other hand, packaging products of this type are prone to problems such as pinholes in the seal, incomplete sealing due to contents getting caught in the seal surface, and breakage due to excessive heating near the inner edge of the seal. , and poor sealing, such as pinholes and cuts in areas other than the seal.

The above-mentioned poor sealing of the packaged product causes the contents to leak out due to spoilage or slight impact, which becomes a major problem when the packaged product is put on the market.

The present invention relates to a detection device that is capable of accurately and highly efficiently detecting a packaged product that has leaked contents due to poor sealing as described above and is in an unsuitable state for sale on the market.

(Prior art) Conventionally, no detection device with satisfactory accuracy has been developed for detecting the sealing state of this type of packaged product, and detection of sealing quality when producing this type of packaged product is difficult. At present, there is no countermeasure other than using primitive methods such as visual detection or detection by pressing the packaged item with your hand. These manual methods have major problems in terms of detection accuracy and labor saving, such as the detection criteria differing depending on individual differences among workers.

(Problems to be Solved by the Invention) The present invention aims to solve the problems of the conventional method as described above, and the first object of the present invention is to An object of the present invention is to provide a detection device capable of accurately and simply detecting . A second object of the present invention is to be able to continuously detect the sealing quality of packaged products in accordance with the production process, especially when used in the production process of producing packaged products at an industrial level. The object of the present invention is to provide a detection device.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the present inventors have conducted research on a device for detecting whether the sealing state of this type of packaged product is good or bad.

The inventors of the present invention first found that when a packaged product is made of a flexible material and contains air inside, when the package is pressurized, depending on whether or not the internal air leaks due to the quality of the sealing state. We focused on the fact that the thickness after pressurization differs between those that are well sealed and those that are not.

The present inventors further conducted research in order to obtain a detection device capable of detecting the quality of the sealing state of a packaged product by utilizing the above-mentioned phenomenon. As a result, the structure of the detection device was changed to 1) a leveling section for applying pressure to the packaged product in a horizontal state using a roller;
2) A pressure detection device that applies pressure to the packaged product after it has passed through the leveling section in a horizontal state, detects the thickness of the packaged product under pressure, and compares and analyzes the detected values; It has been confirmed that the following effects can be obtained by using the above-mentioned leveling section and a device for continuously transferring the pressure to the pressure detection device.

That is, first, after leveling the contents of the package in the leveling section, the pressure detection device applies pressure to the package,
To make the thickness of a packaged product uniform, and at the same time, reduce the thickness by leaking internal air only for packages with a poor sealing condition, and clarify the difference in thickness from those with a good sealing condition. When the thickness of the packaged product is electrically detected in the pressurized state using a pressure detection device, the detected value clearly differs depending on whether the sealed state is good or bad. Therefore, it has been found that by comparing and analyzing these detected values, the quality of the sealed state of the packaged product can be detected extremely accurately and easily. Furthermore, according to this device, the leveling section and the pressure detection device are not structurally complex, and they can be easily installed on a transfer device such as a belt conveyor, thereby making it possible to easily handle packaged products. It has been found that detection can be performed continuously by continuously sending the sample to the leveling section and the pressure detection device.

The present invention has been made based on the above findings, and the gist of the present invention is to provide a leveling unit consisting of a roller or a roller and a conveyor for applying pressure to a packaged product in a horizontal state; A pressure detection section that electrically detects the thickness of the packaged product under pressure and extracts the necessary signals, and the package is continuously transferred horizontally to the leveling section and the pressure detection section. 1. A device for detecting a sealed state in a packaged product of powder or granular material, characterized in that the device is equipped with a transfer device for the purpose of

The present invention will be explained in detail below.

First of all, the packaging product referred to in the present invention is made of synthetic resin, metal foil, laminate packaging, and other films and various flexible materials, and is filled with liquid, paste, or powder substances, or is filled with these substances and Refers to packaging products that are filled with air or other gaseous substances as well as solid substances and sealed by heat sealing, etc., or paper boxes in which these packaging products are placed in close contact with each other. do.

Hereinafter, the detection device of the present invention will be explained based on examples. Figures 1-a and 1-b are a plan view and a side view showing an embodiment of the detection device of the present invention. This device includes pressure rollers 2-1 to 2-5 for pressurizing the packaged product 1, a detection unit 3 for detecting whether the packaged product 1 is sealed properly, and a detection unit 3 for detecting whether the packaged product 1 is sealed properly. Pressure roller 2 above
-1 to 2-5 and a belt conveyor 4 for transferring to the detection section 3.

When using this detection device to detect whether the sealed state of the packaged product 1 is good or not, the packaged product 1 is first fed from the left side of the drawing below the pressure roller 2-1 by the belt conveyor 4. . In this case, the packaged product 1 is placed on the conveyor 4 with one side plate facing down. Here, the belt conveyor 4 is
For example, it has a horizontal belt capable of horizontally transporting the packaged product 1, and is moved in the direction of the arrow a by the drive of the drum 6. In addition, pressure roller 2
-1 to 2-5 are packaged products 1 on conveyor 4
The upper side plate is pressurized with a constant pressure over the entire surface or almost the entire surface. The above-mentioned pressure rollers 2-1 to 2-5 are respectively attached to shafts 5-1 to 5-5 via bearings, and both ends of each shaft are
It is pivotally fixed to concave bearing blocks 7 provided at regular intervals and facing each other via the conveyor 4 so as to be able to slide up and down. In this case, pressure roller 2
-1 to 2-5 are the peripheral edge of the lower edge and the conveyor 4, respectively.
The space between the packaged product 1 and the packaged product 1 is installed so that the gap therebetween is slightly smaller than the thickness of the packaged product 1. Further, each pressure roller has an appropriate weight and hardness so that it can press the packaged product 1 as described below and at the same time leak the contents if there is a seal failure.

First, when the packaged product 1 is fed below the pressure roller 2-1, the pressure roller 2-1
The packaging product 1 is pressed against the upper side plate of the package 1 while rotating. The packaged product 1 is pressurized throughout being transferred by the conveyor 4 while being in pressure contact with the pressure roller 2-1 as described above. Subsequently, the packaged product 1 is sent below the pressure roller 2-2 as the conveyor 4 moves, and is pressed in the same manner as in the above case. Thereafter, the packaged product 1 is sequentially sent to pressure rollers 2-3, 2-4, and 2-5, and is similarly pressed. While passing through the pressure rollers as described above, the contents in the package 1 are leveled horizontally and the thickness of the package 1 is made uniform, and at the same time, the package 1 that is poorly sealed is Pressurization only allows internal air to escape. Therefore, the thickness of the packaged product 1 becomes uniform after passing through the pressure roller, and the thickness of the packaged product 1 with poor sealing is smaller than that of a packaged product 1 with good sealing.

After passing through the pressure roller, the packaged product 1 is sent to the detection section 3. The detection unit 3 includes a detection pressure roller 8,
Level detection roller 9, level detection plate 1
0, an optical sensor 11 and a photoelectric switch 12. The detection pressure roller 8 presses the package 1 at the time of detection.
The roll width is shorter than the width of the packaged product 1. The roller 8 is arranged so that its lower peripheral edge is slightly lower than the upper end of the upper side plate of the packaged product 1.
A shaft 13 installed in the width direction of the belt conveyor 4
It is rotatably installed. Furthermore, the level detection roller 9 is capable of coming into contact with a portion of the upper side plate of the packaged product 1 that cannot be pressed by the detection pressure roller 8 during detection, and is installed in the width direction of the conveyor 4 on the level detection plate 10 described below. It is rotatably provided on a shaft 14 . Note that when the level detection plate 10 is located at the lowest position, the detection roller 9
The lower peripheral edge of the detection pressure roller 8 and the lower peripheral edge of the detection pressure roller 8 are substantially on the same horizontal line. The level detection plate 10 is connected to a shaft 1 installed in the width direction of the conveyor 4.
5 by a shaft attachment part 70, and is slidably provided at the positions indicated by solid lines and chain lines in the figure with the shaft 15 as a fulcrum, and is made of a material that blocks light rays. The optical sensor 11 operates by blocking a light beam and transmits an electrical signal, and can use a phototube or the like. Further, the photoelectric switch 12 senses that the packaged product 1 has come to the detection position and simultaneously activates the optical sensor 11 described above.

When the above-mentioned detection section 3 detects whether the sealed state of the packaged product 1 is good or bad, it is performed as follows.
First, when the packaged product 1 is sent to the detection position, it is sensed by the photoelectric switch 12, and the switch 12 activates the optical sensor 11 to perform the following detection operation. That is, the packaged product 1 sent to the detection position is pressed by the detection pressure roller 8 on a part of the upper side plate. This state is shown in Figures 2-a and 2-b (Figure 2-a shows the state in which the detection pressure roller 8 is in pressure contact with the packaged product 1 which is in a good sealed state; It is a side view from the X direction in the figure, and Fig. 2-b shows a state in which the detection pressure roller 8 is in pressure contact with the packaged product 1 that is poorly sealed.
It is a side view from the X direction in Figure 1-b),
As is clear from this, in response to the pressure applied by the detection pressure roller 8, the contents 1 in the packaged product 1
7 moves to the side of the portion 18 at the top of the packaged product 1 that is not pressed by the detection pressure roller 8. As the contents 17 move as described above, the portion 1 of the packaged product 1 that cannot be pressed by the detection pressure roller 8
8 is deformed to produce a bulge ∪. in this case,
Due to the above-mentioned pressurization operation, there is a difference in the amount of contents between the well-sealed package 1 and the defective package 1 depending on whether or not there is internal air leakage. The degree of deformation and bulge ∪ of the portion 18 that is not pressed by the pressure roller 8 will naturally vary depending on the quality of the seal. That is, in a case where the sealing condition is good, the deformation and the swelling ∪ are large (Fig. 2-a), and in a case where the sealing condition is poor, both are small (Fig. 2-b).

The bulge ∪ of the portion 18 of the packaged product 1 that is not pressed by the detection pressure roller 8 is transmitted to the level detection roller 9 that comes into contact with this portion, thereby causing the level detection plate 10 to move upward about the shaft 15. Sliding. In this case, in the case of the packaged product 1 which is in a good sealed state, the upward movement of the level detection plate 10 will also be large due to the large bulge ∪ of the portion 18 that cannot be pressed by the detection pressure roller 8 as described above. , the plate rises between the optical sensors 11 as shown by the solid lines in the drawing, and blocks the light beam 19 between the optical sensors 11 . on the other hand,
In a packaged product 1 that is poorly sealed, the upward movement of the level detection plate 10 is small, and the light ray 19 is transmitted between the optical sensors 11 as shown by the chain lines in the drawing. In the above case, the level detection plate 10 and the optical sensor 11 need to be installed in a positional relationship that allows a clear judgment as to whether the sealed state of the packaged product 1 is good or bad.

A light beam 1 at the optical sensor 11 as described above
The presence or absence of the interruption of the signal 9 is converted into an electrical signal by the optical sensor 11, and if necessary, the signal is transmitted to the display meter 20 via a suitable transmission device (not shown), thereby displaying the signal. In this case, the display on the display meter 20 differs depending on the quality of the sealing condition of the packaged product 1, and therefore, it is possible to clearly determine whether the packaged product 1 is properly sealed.

After determining whether the sealing condition is good or not as described above, the packaged product 1 is conveyed by the belt conveyor 4, and the packaged products 1 located behind this are then sent to the detection section 3 and continuously Detection is performed.

In the above-described apparatus, the shape and number of pressure rollers may be any shape and number as long as the desired pressure effect can be achieved.
For example, the pressure roller can be a spring, an air cylinder,
A predetermined pressure can also be applied to the packaged product 1 by pressurizing with a hydraulic cylinder or the like. Further, the belt conveyor 4 also transfers the packaged product 1 to the pressure roller and the detection unit 3.
Any conveyor may be used as long as it is capable of conveying the packaged product 1 in a horizontal state as shown in the figure, and for example, a conveyor having an inclined belt may also be used. The detection unit 3 may have any mechanism as long as it can detect and compare the thickness of the packaged product 1. In addition, when sorting the packaged goods 1 into those with good sealing status and those with poor sealing according to the value displayed on the display meter 20, it can be done manually, for example, or by using this device and a transmission device as described later. , an adjustment device, an exclusion device (all not shown), etc. can be connected to operate as a series of control systems.

According to this detection device, the size of the bulge ∪ of the part that is not pressed caused by partially pressing the packaged product 1 after pressurization (the presence or absence of air leakage in the packaged product 1 during pressurization) ) is clearly displayed on the display meter 20. Therefore, the quality of the sealing condition of the packaged product 1 can be detected extremely accurately and easily by the display of the display meter 20. Furthermore, in the above-mentioned apparatus, the packaged product 1 is compressed and transferred in a horizontal state by the pressure roller and the belt conveyor 4, so that the contents inside the packaged product 1 are not subjected to excessive physical shock. Therefore, it is possible to differentiate the thicknesses between those with good sealing and those with poor sealing to the extent that it is possible to easily identify whether the sealing state is good or bad.

Next, the detection device of the present invention will be explained using another embodiment. Figures 3-a and 3-b are a side view and a plan view showing another embodiment of the detection device of the present invention.

This device includes a leveling section 21 for leveling the contents of the packaged product 1 in a horizontal state, a pressure detection section 22 for pressurizing the packaged product 1 and detecting whether the sealed state is good or not, and a pressure detecting section 22 that applies pressure to the packaged product 1 and detects whether the sealed state is good or bad. It consists of a rejecting device 23 for rejecting packaged products 1 that are defective.

When this device is used to detect the quality of the sealed state of the packaged product 1, it is performed as follows. First, the packaged product 1 is fed onto the conveyor roller 24-1 from the right side of the drawing. Here, the conveyor rollers 24-1 to 24-5 are all of the same shape, each installed in the width direction of a pressure conveyor 25 to be described later, and connected to a rotating shaft 26 having a center at the same height.
will be permanently installed. The conveyor rollers are rotated in the direction of the arrow b by applying power to the rotating shaft 26 by appropriate means, and in this case, the circumferential speed of each conveyor roller is made the same as the speed of the pressurizing conveyor 25, for example.

The packaged product 1 is fed below the leveling roller 27 by the conveyor roller 24-1. The leveling roller 27 is attached to a rotating shaft 28 which is installed above and parallel to the rotating shaft 26 of the conveyor roller 24-2, on the upper side plate of the packaged product 1 whose lower peripheral edge is on the conveyor roller. It is fixed so that it is slightly lower than the top. The roller 27
is rotated in the direction of the arrow c at the same circumferential speed as the conveyor roller by applying power to the rotating shaft 28 by an appropriate means. Note that the rotation shaft 28 of the leveling roller 27 is connected to the conveyor roller 24-2.
The rollers are located above the rotating shaft 26 of the roller, and both rollers are provided facing each other. Therefore, the packaged product 1 fed below the leveling roller 27 is
As the conveyor roller 24-2 rotates, the packaged product 1 is sent between both rollers to the left in the drawing, and during this time the packaged product 1 is pressurized from above and below by both rollers, thereby causing the inside of the packaged product 1 to The contents are leveled almost horizontally.

When the contents stored in the packaged product 1 are granular raw materials, a vertical bag-forming and filling machine is often used for packaging. The distribution of raw materials tends to be uneven. Pressure detection unit 22 that moves the packaged product 1 in this state
If the package is sent to a warehouse, the operations that should be performed here, such as making the thickness of the packaged product 1 uniform and allowing internal air to leak if the sealing condition is poor, may not be carried out smoothly. However, the above-mentioned problem is solved by the leveling operation of the leveling section 21 described above, and the subsequent pressurization and detection operations at the pressure detection section 22 can be performed better.

After passing through the leveling roller 27, the packaged product 1 is supplied to the pressure detection section 22 by conveyor rollers 24-3 to 24-5. The pressurization detection section 22 includes a detection conveyor 30, a pressurization conveyor 25, a detector 31, a transmission device 32, an adjustment device 33, and a photoelectric switch 43. The detection conveyor 30 is provided above and opposite to the pressurization conveyor 25, which will be described later. In this case, the conveyor 30
is provided so as to be able to slide around the rotating shaft 35 of the drive drum 34 as a fulcrum to the positions indicated by the solid line and the two-dot chain line in the drawing. Further, when the conveyor 30 is at its lowest position (indicated by the solid line in the drawing), the surface of the belt 37 stretched between the drums 36 and 36' is on the pressure conveyor 25. It is installed so that it is slightly lower than the upper end of the upper side plate of a certain packaged product 1. Further, the conveyor 30 includes, for example, the surface of a belt 37 stretched between the drums 36 and 36' and the pressure conveyor 25.
It can also be installed so that the distance between the belt 38 and the surface of the belt 38 gradually narrows along the traveling direction of the packaged product 1. In the above case, the packaged product 1 is more securely held by the belts of both conveyors 25 and 30, and is smoothly conveyed in the advancing direction. In addition, the conveyor 30 applies pressure to the packaged product 1 to make the thickness of the packaged product 1 uniform, and removes the packaged product 1 that is poorly sealed.
It must be heavy enough to allow the air inside to escape. The pressure conveyor 25 has, for example, a horizontal belt 38 that can transport the packaged product 1 in a horizontal state, and the height of the belt is the same as the upper peripheral edge of the conveyor rollers 24-1 to 24-5. It will be set up.

The packaged product 1 supplied to the pressure detection section 22 is transferred to the pressure conveyor 25 and the detection conveyor 30.
are conveyed between the two conveyors to the left in the drawing by being driven at the same speed in arrow directions d and e by appropriate means, respectively. During this time, the packaged product 1 is pressurized by the pressure conveyor 25 and the detection conveyor 30 between the drums 36 and 36' of the detection conveyor 30, and the thickness is made sufficiently uniform before being conveyed below the drum 36. At the same time, internal air leaks out of the packaged product 1 which is not sealed properly. When the packaged product 1 is carried below the drum 36, the thickness of the packaged product 1 becomes uniform, and at the same time, the detection conveyor 30 is pushed upward according to the thickness of the packaged product 1. In this case, since the thickness of the packaged product 1 differs depending on whether the sealing state is good or not, the extent to which the detection conveyor 30 is pushed up may also be similar to that explained in FIGS. 1-a and 1-b. It will be different.

In the detection device of the present invention, by measuring the upward movement of the detection conveyor 30 as described above,
The quality of the sealed state of the packaged product 1 is detected. First, the packaged product 1 is transferred to the drum 36 on the detection conveyor 30.
When the light is sent to the lower detection position, it is sensed by the photoelectric switch 43, and the photoelectric switch 43
activates the detector 31, and the following operations are performed. That is, a magnetic body 39 is embedded in the drum 36 of the detection conveyor 30, and the magnetic body 39 synchronizes with the vertical movement of the detection conveyor 30. The movement of the magnetic body 39 is detected by the detection head 40 of the detector 31, which is provided in a non-contact manner opposite to the magnetic body 39. Here, the detector 31 detects the drum 36
The device strictly detects the vertical movement of the magnetic body 39 embedded in the magnetic field and converts the detected value into an electric signal, and a magnetic sensor, Magnescale, etc. can be used.
It is also possible to detect the vertical movement of the drum 36 (thickness of the packaged product 1) on the detection conveyor 30 using a phototube detector or the like.

The upward movement of the detection conveyor 30 is detected by a detection head 40, and the detected value is transmitted as a signal from there to a transmission device 32, which will be described later. In this case, since the degree of upward movement of the detection conveyor 30 differs depending on the quality of the sealed state of the packaged product 1 as described above, the signal sent from the detection head 40 of the detector 31 is The results clearly differ depending on the quality of the sealing condition.

From the detection head 40 of the detector 31 to the transmission device 32
The signal sent to the regulator 33, described herein below,
It is converted into another signal suitable for transmission that can be easily analyzed and compared. As the transmission device 32, a converter using a semiconductor is usually used.

Next, the signal converted by the transmission device 32 is analyzed and compared in the adjustment device 33, and an operation signal is sent from there to the exclusion device 23 described below. In this case,
The adjustment device 33 has a target value that can clearly determine whether the signal transmitted from the transmission device 32 indicates that the packaged product 1 is in a good sealed state or is in a bad state. The pre-stored signal sent from the transmission device 32 is compared with this target value to determine whether the sealing condition of the packaged product 1 is good or not, and only in the case of poor sealing, the rejection device 23
sends an operation signal to. As the adjustment device 33, an ordinary electronic adjustment machine or the like can be used.

In addition, for example, an LED display 41 etc. is installed, and the LED
Via the array drive circuit 42, the signal from the transmission device 32 can also be displayed in the form of an LED array. This display 41 displays the light intensity of the vertical movement of the detection conveyor 30.
It is possible to determine whether the sealed state of the packaged product 1 is good or not based on the change in the light intensity of the LED array.

Finally, the packaged product 1 that has passed through the pressure detection section 22
is conveyed by a pressurizing conveyor 25.
In this case, only the packaged product 1 with a defective sealing state is removed from the pressure conveyor 25 during transportation by operating the removal device 23 in response to an operation signal from the adjustment device 33. . In this case, the detector 3
1 and the exclusion device 23 must be set up. Note that as the removal device 23, for example, an air rejector, a mechanically operated lever, or the like can be used.

Thereafter, from the right side of the drawing, the packages 1 are sent one after another onto the conveyor roller 24-1 at predetermined time intervals, and each package 1 is processed as described above.
Detection can be performed continuously by repeatedly performing the leveling operation and the pressurization detection operation.

According to this device, the vertical movement of the detection conveyor 30 is converted into an electrical signal, and the quality of the sealed state of the packaged product 1 can be determined extremely accurately and in a short time by electrically comparing and analyzing this signal. be identified. Moreover, the packaged product 1 detected as having poor sealing as described above is sent to the detector 31 and the rejecting device 23.
It is automatically removed from the line by a control system established between the two. Therefore, the effect of using this detection device in the process of industrially producing this type of packaged product is extremely large.

Next, the detection device of the present invention will be explained using still another embodiment. FIG. 4 is a side view showing still another embodiment of the detection device of the present invention.

This device consists of a leveling section 46, a pressurizing section 47, and a detecting section 48. When this device is used to detect the quality of the sealed state of the packaged product 1, it is performed as follows. First, the packaged product 1 is fed from the right side of the drawing onto the belt conveyor 49 with one side plate facing down. The belt conveyor 49 has a horizontal belt 50 capable of horizontally transporting the packaged product 1 to, for example, a leveling section 46, a pressurizing section 47, and a detecting section 48, which will be described later. is moved in direction f. Note that the belt conveyor 49 is not limited to one that can transport the packaged product 1 in a horizontal state.

The packaged product 1 is sent to the leveling section 46 by the belt conveyor 49 described above. The leveling section 46 includes a belt conveyor 49 and leveling rollers 52-1 to 52-5.
2-5. Here, the leveling rollers 52-1 to 52-5 are each installed above the belt conveyor 49 in the width direction of the belt of the conveyor 19, and are attached to rotating shafts 53- 1 to 53-5 are fixedly installed so that the lower peripheral edge thereof is slightly lower than the upper end of the upper side plate of the packaged product 1 on the belt conveyor 49. The leveling roller is rotated in the direction of the arrow g so that its circumferential speed is the same as the traveling speed of the belt conveyor 49 by applying power to the rotating shaft by appropriate means. The rotating shafts 53-1 to 53-5 of each of the leveling rollers are provided so as to be movable upward when a certain pressure is applied from below by a spring 54. Therefore, in the leveling section 46, the packaged product 1 is sent between the leveling rollers and the belt conveyor 49 to the left side in the drawing as they rotate, and during this time the packaged product 1 is Pressure is applied, whereby the contents within the package 1 are leveled horizontally.

After passing through the leveling section 46, the packaged product 1 is supplied to the pressing section 47 by a belt conveyor 49. The pressurizing section 47 includes a belt conveyor 49 and a preliminary pressurizing conveyor 55. The preliminary pressurization conveyor 55 is provided above and opposite to the belt conveyor 49. In this case, the conveyor 55 is supported by a support member 57 that is movable up and down by a slide bearing 56,
For example, if this is the lowest position, the drum 58
The surface of the belt 59 stretched by and 58' is
The surface of the belt 50 of the belt conveyor 49 is parallel to the surface of the belt 50, and the surface of the belt 59 stretched by the drums 58 and 58' is parallel to the surface of the belt 50 of the belt conveyor 49.
9 is provided so that the gap therebetween is slightly smaller than the thickness of the packaged product 1. Further, the conveyor 55 is driven in the direction of the arrow h by rotating the drum 58 by appropriate means. In addition, the preliminary pressurization conveyor 55 and the support member 5 that supports it
7 has enough weight to properly pressurize the packaged product 1, to make the thickness of the packaged product 1 uniform, and to leak air inside the packaged product 1 that is poorly sealed.

The packaged product 1 supplied to the pressurizing section 47 is transported by the belt conveyor 49 and the preliminary pressurizing conveyor 55.
By being driven at the same speed in the directions of arrows f and h, they are conveyed between both conveyors to the left in the drawing. During this time, the packaged product 1 is pressurized by both conveyors to make the thickness uniform, and at the same time, the internal air of the packaged product 1 that is poorly sealed is leaked out.

Subsequently, the packaged product 1 is sent to the detection section 48. The detection unit 48 includes a belt conveyor 49, a detection pressure conveyor 60, a detection unit 61, and a photoelectric switch 6.
Consists of 2. The detection pressure conveyor 60 is provided above and opposite the belt conveyor 49. The conveyor 60 is similar to the prepressing conveyor 55 described above and is supported by a support member 63 in the same manner.

The packaged product 1 sent to the detection section 48 is conveyed to the left side of the drawing between the belt conveyor 49 and the detection and pressure conveyor 60 in the same manner as in the above-mentioned pressurization section 47. At this time, the detection pressure conveyor 60 is pushed upward depending on the thickness of the packaged product 1. As described above, since the thickness of the packaged product 1 differs depending on whether the packaged product 1 is sealed after passing through the pressurizing section 47, the extent to which the conveyor 60 is pushed up differs.

In this detection device, by measuring the upward movement of the detection pressure conveyor 60 as described above,
The quality of the sealed state of the packaged product 1 is detected. First, when the packaged product 1 is sent to a predetermined detection position between the belt conveyor 49 and the detection pressure conveyor 60, it is detected by the photoelectric switch 62, and the photoelectric switch 62 activates the detection section 61. The following detection operations are performed. That is, a magnetic body 64 is installed on the support member 63 that supports the detection and pressurizing conveyor 60, and synchronizes with the vertical movement of the support member 63. The movement of the magnetic body 64 is detected by the detection head 65 of the detection section 61, which is provided in a non-contact manner opposite to the magnetic body 64. The detector 61 is one that strictly detects the vertical movement of the magnetizing body 64 and converts the detected value into an electric signal, and a magnetic sensor, magnet scale, or the like can be used. Detector 61
The detected value is transmitted as a signal to the display meter 66 via a suitable transmission device (not shown), if necessary, and displayed.

In the above case, if the sealed state of the packaged product 1 is good, the upward movement of the detection pressure conveyor 60 will be a relatively large value and will be displayed on the display meter 66, while if the sealed state is poor. , this movement is smaller than when the seal is in good condition, and a fluctuating value is displayed. Therefore, actually packaged product 1
When detecting whether the sealing condition is good or bad, the value on the display meter 66, which can determine whether the sealing condition is good or bad, is determined in advance experimentally. This is done by comparing. In addition, when sorting the packaged goods 1 into those with good sealing status and those with poor sealing status based on the value displayed on the display meter 66, it may be done manually, for example, or this device and the It is also possible to connect the transmission device, adjustment device, exclusion device (all not shown), etc. as shown in Fig. a, and operate them as a series of control systems.

Thereafter, the packaged products 1 are sent one after another onto the belt conveyor 49 at predetermined time intervals from the right side of the drawing.
Detection can be continuously performed for each packaged product 1 by repeatedly performing the leveling operation, pressurizing operation, and detection operation as described above.

According to this detection device, the thickness of the packaged product 1 after pressurization is clearly digitized and displayed on the display meter 66. Therefore, by determining whether the detection value detected for each packaged product 1 is the one when the sealing state is good or the one when the sealed state is bad, the detection value for the packaged product 1 can be determined. The quality of the sealing condition can be detected extremely accurately and easily.

In the above-mentioned apparatus, the pressurizing operation of the packaged product 1 is carried out by the preliminary pressurizing conveyor 55, and the detecting operation is carried out by the detection pressurizing conveyor 60. It is also possible to omit this and perform the pressurization and detection operations using only the detection and pressurization conveyor 60. In the above case, for example, the space between the drums 68 and 68' in the detection and pressure conveyor 60 is widened, the length of the belt 69 to be stretched is increased, and the photoelectric switch 62 is installed to some extent on the drum 68' side. In the operation, the pressurizing operation is performed at the front part in the transport direction of the packaged product 1 between the belt 50 of the belt conveyor 49 and the belt 69 of the detection pressure conveyor 60, and the detection operation is performed at the rear part. This allows the desired detection effect to be achieved.

Further, in the above-described apparatus, the sealed state of the packaged product 1 is detected by detecting only the upward movement of the detection pressure conveyor 60, but the detection pressure conveyor 55 also detects the sealed state of the packaged product 1 by detecting the upward movement of the detection pressure conveyor 60. 6
A detection mechanism similar to 0 is arranged to detect this upward movement, and the two are compared together with the detected value on the rear detection pressure conveyor 60, and based on this comparison, the sealed state of the packaged product 1 is determined. It is also possible to detect. As mentioned above, even when only the detection pressure conveyor 60 is provided, the conveyor 6
0 and the belt conveyor 49, a photoelectric switch 62 is disposed at two locations, one in front and the other in the transport direction of the packaged product 1, and the thickness of the packaged product 1 is detected at two locations. Detection can also be done by comparing values. In these cases, by comparing and analyzing multidimensionally determined detection values, the sealed state of the packaged product 1 can be detected extremely accurately.

The above has merely described one embodiment of the present invention, and it goes without saying that various modifications and applications can be easily made without departing from the gist of the present invention.

(Effects of the Invention) As described above, according to the detection device of the present invention, it is possible to reliably and easily detect a defect in the sealing state of a packaged product.Moreover, this detection device has a simple structure and can be used in various ways. Since it can be incorporated into a packaging machine or the like to achieve an excellent detection effect, it is extremely effective when used in the production process of producing this type of packaged products on an industrial level.

[Brief explanation of drawings]

Figures 1-a and 1-b are a plan view and a side view showing an embodiment of the detection device of the present invention, and Figures 2-a and 2-b show a detection pressure roller on a packaged product. A side view from the X direction in FIG. 1-b showing a pressed state, and FIGS. 3-a and 3-b are a side view and a plan view showing another embodiment of the detection device of the present invention. , FIG. 4 is a side view showing still another embodiment of the detection device of the present invention. 1... Packaged product, 2-1 to 2-5... Pressure roller, 3, 48... Detection section, 4, 49... Belt conveyor, 5-1 to 5-5, 13, 14, 15,
26, 28, 35, 53-1 to 53-5...rotating shaft, 6, 6', 36, 36', 50, 51, 58,
58', 68, 68'...Drum, 7...Bearing, 8
...Detection pressure roller, 9...Level detection roller, 10...Level detection plate, 11...Optical sensor, 12, 43, 62...Photoelectric switch,
17...Contents, 19...Light beam, 20, 66...Display meter, 21...Leveling section, 22...Pressure detection section, 23...Exclusion device, 24-1 to 24-5...
Conveyor roller, 25... Pressure conveyor,
27, 52-1 to 52-5... Leveling roller, 3
0...Detection conveyor, 31, 61...Detector, 32...Transmission device, 33...Adjustment device, 34
... Drive drum, 37, 38, 50, 59, 69
... Belt, 39,64 ... Magnetizing body, 40,65
...Detection head, 41...LED indicator, 42...
...LED array drive circuit, 46...leveling section,
47... Pressure section, 54... Spring, 55... Conveyor for preliminary pressure application, 56, 67... Slide bearing, 57, 63... Support member, 60... Conveyor for detection pressure application, 70... Shaft attachment part .

Claims (1)

[Scope of Claims] 1. A leveling unit consisting of a roller or a roller and a conveyor for pressurizing a packaged product in a horizontal state; It is characterized by being equipped with a pressure detection part for detecting the pressure and extracting the necessary signal, and a transfer device for continuously transporting the packaged products in a horizontal state to the leveling part and the pressure detection part. A device for detecting the sealing state of packaged powder and granular materials. 2. A leveling unit consisting of rollers or rollers and a conveyor for applying pressure to the packaged product in a horizontal state; A pressure detection unit for extracting the necessary signal; a transmission device for converting the signal obtained by the detection unit into another signal suitable for transmission and transmitting the same; and converting the signal from the transmission device to a target value. a control device for comparing the control device with the control device and outputting an operation signal; a device for receiving the control signal from the control device and rejecting poorly sealed packages; and transferring the package to the leveling unit and pressure detection unit in a horizontal state. 1. A device for detecting a sealed state of a packaged product of powder or granular material, characterized in that the device is equipped with a transfer device for continuously transferring the packaged product.