System and method for detecting plate based on air pressure for edge bonding machine

Abstract

The invention discloses an air-pressure-based plate detection system of an edge bonding machine, which belongs to the field of edge bonding machines and comprises a plate feeding platform, a side leaning guide plate, an air source device, an air pressure sensor and a PLC (programmable logic controller) which are mounted on the edge bonding machine, and at least one micropore is formed in the working surface of each of the plate feeding platform and the side leaning guide plate; the air source device is communicated with the cavity I and the cavity II through the flow dividing pipeline, and the air pressure sensor is installed on the flow dividing pipeline and used for detecting pressure changes of the cavity I and the cavity II. By means of the air pressure sensing principle, environmental interference such as wood chips, dust and glue mist can be effectively resisted, and whether the plate reaches and abuts against the preset position or not can be accurately and reliably detected.

Description

Technical Field

[0001] This invention belongs to the field of edge banding machines, and more specifically, relates to a system and method for edge banding machines based on air pressure detection of the board material. Background Technology

[0002] An edge banding machine is a highly automated machine that replaces manual edge banding processes: conveying, applying glue and attaching the edge, cutting, front and back trimming, top and bottom trimming, top and bottom fine trimming, top and bottom scraping, and polishing. It is mainly divided into semi-automatic and handheld types.

[0003] During the processing, the board placed on the feeding platform needs to be closely attached to the side guide plate (or guide rail, guide rail) of the edge banding machine to ensure the accuracy and consistency of the edge banding position.

[0004] Currently, there are two main methods for edge banding machines to detect the presence of boards:

[0005] Photoelectric sensor detection: A photoelectric sensor is installed near the guide plate to determine the presence or absence of the board by detecting whether the light beam is blocked by the board. The disadvantages are that the sensor is susceptible to contamination from sawdust, dust, glue mist, etc., leading to false detections, and its performance is poor for transparent or semi-transparent boards.

[0006] Mechanical microswitch detection: The switch is triggered by pressing a mechanical contact against a plate. Disadvantages include the mechanical structure being prone to wear and fatigue, limited lifespan, slow response speed, and potential for poor contact.

[0007] These traditional methods are unreliable in harsh industrial environments. False detections and missed detections can lead to defects in edge banding quality (such as incomplete edge banding or empty sealing) or idle equipment, reducing production efficiency and product quality.

[0008] Therefore, there is an urgent need for a non-contact detection solution with strong anti-interference ability, high reliability, and long lifespan to solve the above problems. Summary of the Invention

[0009] To address the above deficiencies, this invention provides a system for edge banding machines based on air pressure detection of sheet material, including a feeding platform, a side guide plate, an air source device, an air pressure sensor, and a PLC controller installed on the edge banding machine;

[0010] The feeding platform is used to place the plate to be tested. The feeding platform and the side guide plate are respectively provided with cavity I and cavity II. The working surfaces of the feeding platform and the side guide plate are each provided with at least one microhole. The air source device is connected to cavity I and cavity II through a split pipeline. The air pressure sensor is installed on the split pipeline to detect the pressure changes in cavity I and cavity II.

[0011] The PLC controller is used to receive signals from the air pressure sensor and, after judgment, control the pressure roller, glue application, and cutting mechanisms of the edge banding machine to perform their functions.

[0012] Furthermore, the pore size of the micropores is 0.5-3 mm;

[0013] The micro-holes at the feed platform are located on the side near the guide plate.

[0014] Furthermore, the standard gas supply threshold of the gas source device is 0.1-0.5 MPa.

[0015] The present invention further includes a method based on the above-mentioned edge banding machine and a pneumatic pressure detection board system, comprising the following steps:

[0016] S1: Gas supply: Gas at a constant pressure is continuously or intermittently supplied to cavity I and cavity II through a gas source device;

[0017] S2: Pressure build-up: The sheet material is transported to the feeding platform by the conveyor belt, and the bottom and sides of the sheet material cover the micropores at the feeding platform and the side guide plate, respectively.

[0018] When the plate is not pressed tightly against the guide plate, the gas escapes into the external environment through the micropores. At this time, the gas pressure value at the detection point is maintained at a low baseline level P0.

[0019] S3: Status detection: Real-time detection of air pressure values ​​in cavity I and cavity II via air pressure sensors;

[0020] S4: Signal judgment: When the board is transported to the board feeding platform and pressed against the side guide plate, the board will block the micropores, preventing gas from escaping, causing the air pressure in cavity I11 and cavity II21 to rise rapidly.

[0021] Signal A: When the air pressure sensor detects an increase in air pressure and it exceeds the preset threshold P_th, it is determined that the plate is in a tight and reliable state.

[0022] Signal B: When the air pressure sensor detects that the air pressure is still the reference air pressure P0 when the micropores are not covered, it is determined that there is no board or the board is not close to the surface.

[0023] S5: Signal Output

[0024] When the PLC controller receives signal A from the air pressure sensor, it generates a board ready signal and sends the signal to the control system of the edge banding machine. The control system then starts or continues to perform the edge banding operation.

[0025] When the PLC controller receives signal B from the air pressure sensor, it generates a signal indicating that the plate is not in place.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] Replacing the traditional photoelectric and mechanical detection structure, this device utilizes the principle of air pressure sensing to effectively resist environmental interference such as wood chips, dust, and glue mist. It completely avoids the problem of photoelectric sensors failing due to contamination, has no mechanical wear, and has an extremely long lifespan. Regardless of the color, material (wood, plastic, glass, metal, etc.), or transparency of the board, as long as its surface can form an effective seal, it can accurately and reliably detect whether the board has reached and is close to the predetermined position. At the same time, ventilation can remove dust from the board surface, thereby improving the automation level and processing quality of the edge banding machine.

[0028] It can be modified by machining air chambers and micropores on the guide plate of the existing edge banding machine. The modification cost is low and it is easy to promote. Attached Figure Description

[0029] Figure 1 This is a schematic diagram showing the positions of the infeed platform and the side guide plate in this invention.

[0030] Figure 2 This is a perspective view of the feed platform and the side guide plate in this invention.

[0031] Figure 3 This is a schematic diagram of the side-mounted guide plate in this invention.

[0032] Figure 4 This is a partial cross-sectional view of the guide plate on the side in this invention.

[0033] Figure 5 This is a schematic diagram of the board entry platform in this invention.

[0034] Figure 6 This is a partial cross-sectional view of the feed plate platform in this invention.

[0035] Figure 7 This is a schematic diagram of the workflow in this invention.

[0036] In the diagram: 1. Feeding platform; 2. Side guide plate; 6. Microhole; 11. Cavity I; 21. Cavity II; 8. Edge banding machine. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Example 1

[0039] like Figures 1 to 6 As shown, this embodiment provides a system for edge banding machines based on air pressure detection of sheet material, including a board feeding platform 1 and a side guide plate 2 installed on the edge banding machine 8 for receiving sheet material conveyed from the conveyor belt, an air source device for supplying air, an air pressure sensor for detecting air pressure, and a PLC controller for automatic control according to preset parameters.

[0040] The feeding platform 1 is used to place the board to be tested. Cavities I11 and II21 are respectively formed inside the feeding platform 1 and the side guide plate 2. At least one microhole 6 (with a diameter of 0.5-3mm) is formed on the working surfaces of both the feeding platform 1 and the side guide plate 2. The microholes 6 cooperate to contact the bottom surface and sidewalls of the board. The number and layout of the microholes 6 can be adjusted according to the length of the feeding platform 1 and the side guide plate 2, as well as the required detection sensitivity. A microhole 6 is placed at regular intervals to ensure effective detection regardless of where the board is pressed against the surface. Figure 2 As shown, the two micropores 6 can be distinguished by pore 1 61 and pore 2 62, which are used to detect the ventilation of the horizontal and vertical planes, respectively.

[0041] The air supply unit includes an air pump, an air tank, and a pressure regulating valve, used to provide stable and clean compressed air. The air supply unit is connected to cavities I11 and II21 via branch lines, such as... Figure 2 As shown, the two branch ports of the branch pipeline are connected to cavity I11 (lower end opening) and cavity II21 (side opening) respectively to supply air into the two cavities, and then overflow from the micro-hole 6. The pressure sensor is installed on the branch pipeline to detect the pressure changes in cavity I11 and cavity II21. The air source device provides filtered and pressure-stabilized compressed air, and the air pressure is adjusted within the range of 0.1-0.5MPa.

[0042] When the plate is not pressed against the side guide plate 2, gas escapes into the external environment through the micropores 6. At this time, the detected air pressure value is maintained at a low reference level P0. When the plate is conveyed to the plate feeding platform 1 and pressed against the working surface of the side guide plate 2, the plate surface will block the micropores 6, preventing air from escaping. The air pressure in the corresponding cavity I11 or cavity II21 will increase accordingly. The air pressure sensor detects this pressure change. When the pressure value exceeds the preset threshold (e.g., 0.05MPa), the air pressure sensor outputs a signal to the PLC controller for judgment.

[0043] It should be noted that the threshold P_th should be higher than the reference air pressure P0 when there is no board, but much lower than the supply air pressure of the air source device. The specific value can be determined through actual operation, and the standard should be that the presence or absence of board can be clearly distinguished.

[0044] The PLC controller receives and interprets signals from the air pressure sensor, then inputs the signals to the main control system of the edge banding machine 8 to control the subsequent operation of the pressing roller, gluing, and cutting mechanisms of the edge banding machine 8.

[0045] Example 2

[0046] like Figure 7 As shown, the method for testing the edge banding machine based on the air pressure detection system of the board material in Example 1 is as follows:

[0047] S1: Gas supply: Gas at a constant pressure is continuously or intermittently supplied to cavities I11 and II21 through a gas source device;

[0048] S2: Pressure build-up: The sheet material is transported to the feeding platform 1 by the conveyor belt, and the bottom and sides of the sheet material cover the microholes 6 at the feeding platform 1 and the side guide plate 2, respectively.

[0049] When the plate is not close to the guide plate, the gas escapes to the outside environment through the micropore 6. At this time, the air pressure value detected by the air pressure sensor 3 is maintained at a low reference level P0. When there is a plate, the air pressure value will change.

[0050] S3: Status detection: Real-time detection of air pressure values ​​in cavities I11 and II21 via air pressure sensors;

[0051] S4: Signal judgment: When the board is transported to the board feeding platform and pressed against the side guide plate, the board will block the micropores 6, preventing gas from escaping, causing the air pressure in cavity I11 and cavity II21 to rise rapidly.

[0052] Signal A: When the air pressure sensor detects an increase in air pressure and it exceeds the preset threshold P_th, the plate is determined to be in a reliable and tight state.

[0053] Signal B: When the air pressure sensor detects that the air pressure is still the reference air pressure P0 when the micro-hole 6 is uncovered, it is determined that there is no board or the board is not close to the surface.

[0054] S5: Signal Output

[0055] When the PLC controller receives signal A from the air pressure sensor, it generates a board ready signal and sends the signal to the control system of the edge banding machine 8. The control system starts or continues to perform the edge banding operation. After the board leaves, the micropore 6 reconnects with the atmosphere, the air pressure drops, and it continues to wait for the next board.

[0056] When the PLC controller receives signal B from the air pressure sensor, it generates a board not in place signal (i.e., the board is not tightly attached or the board has been sealed and is waiting for the next board).

[0057] It should be noted that the structure described in this invention can be implemented in many different forms and is not limited to the embodiments described. Any equivalent transformations made by those skilled in the art based on the description and drawings of this invention, or direct or indirect applications in other related technical fields, such as the loading and unloading of other items, are included within the protection scope of this invention.

Claims

1. A system for edge banding machines based on air pressure detection of sheet materials, characterized in that, Includes an infeed platform, side guide plate, air source device, air pressure sensor and PLC controller installed on the edge banding machine; The feeding platform is used to place the plate to be tested. The feeding platform and the side guide plate are respectively provided with cavity I and cavity II. The working surfaces of the feeding platform and the side guide plate are each provided with at least one microhole. The air source device is connected to cavity I and cavity II through a split pipeline. The air pressure sensor is installed on the split pipeline to detect the pressure changes in cavity I and cavity II. The PLC controller is used to receive signals from the air pressure sensor and, after judgment, control the pressure roller, glue application, and cutting mechanisms of the edge banding machine to perform their functions.

2. The edge banding machine system based on air pressure detection of the board material as described in claim 1, characterized in that: The pore size of the micropores is 0.5-3 mm; The micro-holes at the feed platform are located on the side near the guide plate.

3. The edge banding machine system based on air pressure detection of the board material as described in claim 1, characterized in that: The standard gas supply threshold of the gas source device is 0.1-0.5 MPa.

4. A method based on a pneumatic pressure detection board system using an edge banding machine according to any one of claims 1-3, characterized in that, Includes the following steps: S1: Gas supply: Gas at a constant pressure is continuously or intermittently supplied to cavity I and cavity II through a gas source device; S2: Pressure build-up: The sheet material is transported to the feeding platform by the conveyor belt, and the bottom and sides of the sheet material cover the micropores at the feeding platform and the side guide plate, respectively. S3: Status detection: Real-time detection of air pressure values ​​in cavity I and cavity II via air pressure sensors; S4: Signal judgment: When the board is transported to the board feeding platform and pressed against the side guide plate, the board will block the micropores, preventing gas from escaping, causing the air pressure in cavity I and cavity II to rise rapidly. Signal A: When the air pressure sensor detects an increase in air pressure and it exceeds the preset threshold P_th, it is determined that the plate is in a tight and reliable state. Signal B: When the air pressure sensor detects that the air pressure is still the reference air pressure P0 under the condition of no micropore coverage, it is determined that there is no board or the board is not in close contact. S5: Signal Output When the PLC controller receives signal A from the air pressure sensor, it generates a board ready signal and sends the signal to the control system of the edge banding machine. The control system then starts or continues to perform the edge banding operation. When the PLC controller receives signal B from the air pressure sensor, it generates a signal indicating that the plate is not in place.

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