JPH11351831A - Veneer manufacture inspection apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a veneer manufacture inspection apparatus capable of a high accuracy detection wherein erroneous detection due to vibrations of a belt conveyer, etc., is avoidable. SOLUTION: A first perpendicular light refractor 15 mounted on a light emitter of a light emitting device 14 for refracting light incident from a mirror mounted on the top end thereof vertically from above to a belt conveyer right angles at its top end and second perpendicular light refractor 17 mounted on a light receptor of a light receiving device 18 for refracting a detected incident from a mirror mounted on the top end thereof from above vertically to a belt conveyer right angles at its top end to emit it to the light receptor are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plywood production inspection apparatus used in a plywood production line.

[0002]

2. Description of the Related Art In recent years, plywood is manufactured by rolling wood chip chips together with an adhesive or the like, and the manufacturing line is as shown in FIGS. FIG. 3 is a conceptual diagram for explaining a plywood production line. In FIG. 3, reference numeral 1 denotes a belt conveyor, 2 denotes a chip material dispersing portion, 3 denotes a cover, 4 denotes a chip material sprayed on the belt conveyor, 5 denotes a rolling roller for rolling the chip material, and 6 denotes a roll of the chip material. It is a plywood manufactured.

FIG. 4 is a diagram showing a state of the chip material 4 spread on the belt conveyor 1. FIG. 5 is a cross-sectional view showing a cross section of the belt conveyor viewed from the direction of arrow A in FIG. 4, and as shown in FIGS. A flat portion 4a is formed at the portion, and a peak 4b is formed at both ends. Then, only the flat portion 4a is rolled to produce a plywood. Therefore, as shown in FIG. 6, the height (h) of the flat portion 4a of the chip material 4 flowing on the belt conveyor 1 must be uniform, and when the foreign material 4c is mixed,
This needs to be detected. Therefore, a change in the height (h) of the flat portion and the intrusion of the foreign matter 4c are detected using the plywood manufacturing inspection device.

FIG. 7 is a view showing an example of a conventional plywood manufacturing and inspection apparatus. Reference numeral 21 denotes a laser emitter for outputting a coherent detection light beam 22, reference numeral 23 denotes a photoelectric sensor, reference numeral 24 denotes a control circuit for controlling the entire apparatus. 25 indicates an alarm device. When the height of the flat portion 4a changes or the detection light beam 22 is blocked by the foreign matter 4c, the photoelectric sensor 23 detects this and activates the alarm device 25 to generate an alarm. Inspection of the production line is performed by a worker who has been working.

[0005]

The above-mentioned conventional plywood manufacturing and inspection apparatus has the following problems. In order to detect a subtle change in the height of the flat portion 4a, it is necessary to bring the detection light beam 22 as close as possible to the flat portion 4a. Is attached to the detection end, so that it cannot be approached more than a certain degree. That is, the laser light emitter 21 and the photoelectric sensor 23 require a certain thickness due to their structures, and the detection light beam 22 can be emitted only from the vicinity of the center of the thickness. Since it can only be detected in the vicinity, it cannot be inevitably approached to the width Δw2 or less, so that a delicate change in height cannot be detected with high accuracy.
The chip material 4 is moving on the belt conveyor 1,
Although the height of the flat portion 4a changes due to the vibration generated in the belt conveyor 1, there is a problem that the vibration causes erroneous detection.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a plywood manufacturing and inspection apparatus capable of performing high-accuracy detection and preventing erroneous detection due to belt conveyor vibration or the like. I have.

[0007]

A plywood production inspection apparatus according to the present invention is used in a plywood production line, and a light emitting device and a light receiving device are installed in a short side direction of a belt conveyor, and a horizontal and a parallel to the belt conveyor are installed. In a plywood production inspection device, which transmits and receives a detection light beam at a position, and checks whether the thickness of the wood chip chip material conveyed on the belt conveyor is uniform and the inclusion of foreign matter depending on whether or not the detection light beam is blocked. A light-emitting device attached to a frame provided on a belt conveyor and emitting light rays vertically downward with respect to the belt conveyor, and a light-receiving device similarly attached to the frame and receiving light beams incident vertically upward from the belt conveyor And a mirror attached to the light emitting portion of the light emitting device and attached to the tip thereof, the light incident on the belt conveyor from above in the vertical direction. A first light perpendicular refraction part which is refracted at a right angle at the end and is used as the detection light beam, and the detection light beam is incident on the front end by a mirror attached to the light receiving part of the light receiver and attached to the front end thereof. A second right-angle refraction unit that refracts the light at a right angle and emits the light to the light receiving unit. Therefore, the detection light beam can be brought to a position very close to the flat portion, and highly accurate detection can be performed.

[0008] Further, the present invention is characterized in that the first right-angle refracting portion and the second right-angle refracting portion are configured by using prisms instead of mirrors.

In addition, the first light orthogonal refraction part and / or
The second light orthogonal refraction section is provided with a slit for preventing the spread of the emitted light beam. With this configuration, the detection accuracy can be further improved.

Further, a frame provided on the belt conveyor is a movable frame vertically movable by an actuator, and a plurality of distance sensors for constantly detecting a distance from a reference position to a wood chip material on the belt conveyor at a plurality of locations. Means for feedback-controlling the height position of the movable frame by the actuator when it is determined that the height position of the belt conveyor has changed based on distance measurement information from the plurality of distance sensors. It is characterized by the following. With such a configuration, it is possible to prevent erroneous detection due to vibration of the belt conveyor or the like, and to achieve a stable apparatus.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing the overall configuration of a plywood production inspection apparatus according to the present invention, and FIG.
FIG. In FIG. 1, 10 is a fixed frame, 1
1 is an actuator, 12 is a movable frame, 13 is a distance sensor, 14 is a laser emitter, 15 is a first right-angle refraction unit, 16 is a detection light beam, 17 is a second right-angle refraction unit,
8 is a photoelectric sensor, 19 is a control circuit, and 20 is an alarm device.

As shown in FIG. 1, the plywood manufacturing and inspection apparatus of the present invention comprises an actuator 11 mounted on a fixed frame 10.
A movable frame 12 movable up and down with respect to the belt conveyor plane, a laser emitter 14 that emits a light beam perpendicular to the belt conveyor direction, and a photoelectric sensor 18 that receives a light beam perpendicular to the belt conveyor direction. Is attached. A first light orthogonal refraction unit 15 is attached to the light emitting end of the laser light emitter 14, and a second light orthogonal refraction unit 17 having the same structure is attached to the light receiving end of the photoelectric sensor 18. I have. Further, on both sides of the fixed frame 10, a plurality of distance sensors 13 are provided at a plurality of locations to constantly measure the distance from the reference position to the flat portion 4a of the chip member 4 on the belt conveyor 1. FIG. 2 is a cross-sectional view showing the configuration of the right-angle refracting portions 15 and 17, where 100 indicates a mirror and 101 indicates a slit.

Next, the operation of the plywood manufacturing and inspection apparatus shown in FIGS. 1 and 2 will be described. A light beam emitted downward from the laser light emitter 14 in the direction perpendicular to the belt conveyor 1 is drawn out to a position immediately near the flat portion 4 a by the first right-angle refracting portion 15, is refracted at a right angle, and is parallel to the belt conveyor 1. The detection light 16 is emitted. As shown in FIG. 2, each of the right-angle refracting portions 15 and 17 can have a simple structure in which a mirror (or a right-angle prism) inclined at 45 degrees is attached to the tip. As for the detection light beam 16, a light beam having a smaller beam diameter can be detected with higher accuracy, and therefore, a mirror or prism attached to the tip can be smaller, and as a result,
The detection light beam 16 can be emitted immediately near the flat portion 4a, and the width Δw1 between the flat portion 4a and the detection light beam 16 can be reduced, and Δw1 << Δw2. As a result, it is possible to detect a fine change in the height of the flat portion 4a and a small foreign substance 4c, which cannot be detected by the conventional plywood manufacturing and inspection apparatus.

That is, in the conventional plywood production and inspection apparatus, the detection light beam 22 emitted directly from the laser light emitter 21 in parallel with the belt conveyor 1 is directly received by the photoelectric sensor. However, in the plywood manufacturing and inspection apparatus of the present invention, the tip portion is made up of the right-angle refraction portions 15 and 17 that can be made up of small mirrors or prisms, so that it can be brought very close to the flat portion 4a. This enables highly accurate detection.

By attaching the right-angle refracting portions 15 and 17, as shown in FIG.
1 can be provided, and the spread of the detection light beam 16 can be easily prevented. According to the experiments conducted by the applicants of the present application, the plywood production inspection apparatus of the present invention can detect a change in height of 4 mm or more for a chip material having a thickness of 6 to 7 cm.

In the plywood manufacturing and inspection apparatus of the present invention, the distance sensor 13 attached to the fixed frame 10 constantly detects the distance to the flat portion 4a at a plurality of locations. Is detected, it can be assumed that there is a change due to vibration of the belt conveyor 1 or the like, and the actuator 11 is operated to move the movable frame 12 to perform feedback control to correct this change. However, this is no longer erroneously detected as the foreign substance 4c or the like.

In the above embodiment, the light emitting device is a laser light emitting device and the light receiving device is a photoelectric sensor. However, any light emitting device and light receiving device that operate similarly can be used.

[0018]

As described above, the plywood manufacturing / inspection apparatus of the present invention can detect a slight change in the height of a flat portion, and can perform highly accurate detection. In addition, since erroneous detection due to vibration of the belt conveyor or the like can be prevented, there is an effect that stable detection can be performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing the overall configuration of a plywood production inspection apparatus according to the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of a light orthogonal refraction unit illustrated in FIG.

FIG. 3 is a diagram for explaining a plywood production line.

FIG. 4 is a diagram for explaining a plywood production line.

FIG. 5 is a diagram for explaining a plywood production line.

FIG. 6 is a diagram for explaining a plywood production line.

FIG. 7 is a diagram showing an example of a conventional plywood production inspection apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Fixed frame 11 Actuator 12 Movable frame 13 Each distance sensor 14 Laser light emitting device 15 1st light right angle refraction part 16 Detection light 17 2nd light right angle refraction part 18 Photoelectric sensor 19 Control circuit 20 Alarm device 100 Mirror 101 Slit

Claims (4)

[Claims] 1. Used in a plywood production line, a light-emitting device and a light-receiving device are installed in the short direction of a belt conveyor to transmit and receive a detection light beam at a horizontal position parallel to the belt conveyor, and the detection light beam is blocked. In a plywood production inspection device for checking the uniformity of the thickness of wood chip material and the mixing of foreign matter that are conveyed on a belt conveyor depending on whether or not the belt conveyor is attached, the belt conveyor attached to a frame provided on the belt conveyor A light-emitting device that emits light rays vertically downward with respect to a light-receiving device that is also attached to the frame and receives light beams that enter vertically upward from the belt conveyor; A first light which is refracted at a front end thereof by a mirror mounted on the belt conveyor from a direction perpendicular to the belt conveyor at a right angle and becomes the detection light. A right-angle refraction unit, and a second light right-angle refraction unit that receives the detection light beam at the end by a mirror attached to the light-receiving unit of the light receiver and attached to the end, refracts the detection light at a right angle, and emits the light to the light-receiving unit. A plywood production inspection apparatus characterized by comprising: 2. The plywood production inspection apparatus according to claim 1, wherein the first right-angle refraction section and the second right-angle refraction section are configured using a prism instead of a mirror. Manufacturing inspection equipment. 3. The plywood production inspection device according to claim 1, wherein the first light orthogonal refraction part and / or the second light orthogonal refraction part prevent the spread of the emitted light beam. A plywood production inspection device, characterized in that a slit is provided. 4. The plywood manufacturing and inspection apparatus according to claim 1, wherein the frame provided on the belt conveyor is a movable frame vertically movable by an actuator, and the belt is moved from a reference position. Providing a plurality of distance sensors that constantly detect the distance to the wood chip material on the conveyor at a plurality of locations, and when it is determined that the height position of the belt conveyor has changed based on distance measurement information from the plurality of distance sensors. Is
A plywood production inspection device, comprising: means for feedback-controlling the height position of the movable frame by the actuator.