Automatic nose opening control method for metal alarm of plywood continuous press production line

Abstract

The invention discloses a plywood continuous press production line metal alarm automatic nose opening control method, which comprises the following steps that 1, a mechanical arm places four plates on a forming belt of a forming line at certain intervals in sequence every time, and at the moment, a PLC of the mechanical arm records the positions of plate heads of the four plates and transmits the positions to a PLC of the forming line through a PN coupler; the PLC of the forming line reads the plate head position of each plate; 2, moving the forming line, reading data of a rotary encoder mounted on a long belt drive of the forming line by using a Siemens S120 controller every time the forming line moves by 100mm, and calculating a PLC (Programmable Logic Controller) for sending a pulse to the forming line so as to record the real-time position of the head of the substrate; 3, if one plate contains metal, a metal detector arranged above the forming belt can send an alarm signal to a PLC of a forming line, and the PLC of the forming line judges the number of the plates when the metal alarms; and 4, when the metal-containing plate moves to a specific position, the nose is opened, so that the metal-containing plate falls out of the forming line.

Description

Technical Field

[0001] The invention relates to the technical field of a continuous plywood press production line, in particular to a metal alarm automatic nose opening control method for a continuous plywood press production line. Background Art

[0002] The nose in the plywood continuous press production line refers to the transition part between the forming belt and the press. Considering the characteristics of plywood, the nose cannot be opened arbitrarily. In addition, since the plywood continuous production line is a fine surface layer of particle board on the upper and lower surfaces of the finished plywood, the slab of the production line is 1.24*2.48 plywood. When the nose is opened, it is possible that the slab is stuck in the waste hopper, causing the production line to malfunction and stop.

[0003] However, whether there is metal in the fine surface layer of the upper and lower surfaces of the finished plywood needs to be detected. If metal is found in the fine surface layer of the upper and lower surfaces of the finished plywood after detection, it is necessary to open the nose and remove the plywood blank containing metal in the fine surface layer of the upper and lower surfaces of the finished plywood.

[0004] Generally speaking, four substrates (finished plywood with a fine surface layer of particle board on the upper and lower surfaces) are placed on the forming belt by the robot arm one by one at a time. It is difficult to detect which substrate has metal and remove it. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for automatically opening the nose of a plywood continuous press production line with a metal alarm in response to the problems existing in the above-mentioned prior art. Once it is found that the board contains metal, the nose is opened to remove the board containing metal.

[0006] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0007] A method for automatically opening the nose of a metal alarm in a plywood continuous press production line comprises the following steps:

[0008] Step 1: The robot arm places four boards on the forming belt of the forming line at a certain distance each time. At this time, the PLC of the robot arm will record the position of the board heads of the four boards and transmit it to the forming line PLC through the PN coupler. The PLC of the forming line reads the board head position of each board;

[0009] Step 2: The molding line moves. Every time it moves 100 mm, the Siemens S120 controller reads the data of the rotary encoder installed on the long belt drive of the molding line and calculates and sends a pulse to the PLC of the molding line, thereby recording the real-time position of the substrate head;

[0010] Step 3: If a plate contains metal, the metal detector installed above the forming belt will send an alarm signal to the PLC of the forming line. The PLC of the forming line determines which plate the metal alarm is.

[0011] Step 4: When the sheet containing the metal moves to a specific position, the nose is opened so that the sheet containing the metal falls out of the forming line.

[0012] In a preferred embodiment of the present invention, the certain distance in step 1 refers to a distance of 30 to 50 mm between two adjacent plywood boards.

[0013] In a preferred embodiment of the present invention, the metal detector is a metal detector produced by CASSEL of Germany.

[0014] Due to the adoption of the above technical solution, the present invention can accurately open the nose position and remove the metal-containing plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the process flow of automatic nose opening control method for metal alarm of continuous press production line for plywood.

[0016] Figure 2 It is a schematic diagram of the molding line. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0018] See also Figure 1 and Figure 2 The present invention provides a method for automatically opening the nose of a metal alarm of a plywood continuous press production line, comprising the following steps:

[0019] Step 1: The robot arm places four boards A1, A2, A3, and A4 on the forming belt 10 of the forming line at a certain distance each time. At this time, the PLC of the robot arm will record the position of the board heads of the four boards and transmit it to the forming line PLC through the PN coupler. The PLC of the forming line reads the board head position of each board; the certain distance means that the interval between two adjacent plywood boards is 30 to 50 mm;

[0020] Step 2: The molding line moves. Every time it moves 100 mm, the Siemens S120 controller reads the data of the rotary encoder installed on the long belt drive of the molding line and calculates and sends a pulse to the PLC of the molding line, thereby recording the real-time position of the substrate head;

[0021] Step 3: If a plate contains metal, the metal detector 20 installed above the forming belt 10 will send an alarm signal to the PLC of the forming line, and the PLC of the forming line will determine which plate the metal alarm is. The metal detector 20 is a metal detector of CASSEL of Germany.

[0022] Step 4: When the sheet containing metal moves to a specific position, the nose 30 is opened so that the sheet containing metal falls out of the forming line.

Claims

1. A method for automatically opening the nose of a metal alarm in a plywood continuous press production line, characterized in that: The steps include: Step 1: The robot arm places four boards on the forming belt of the forming line at a certain distance each time. At this time, the PLC of the robot arm will record the position of the board heads of the four boards and transmit it to the forming line PLC through the PN coupler. The PLC of the forming line reads the board head position of each board; Step 2: The molding line moves. Every time it moves 100 mm, the Siemens S120 controller reads the data of the rotary encoder installed on the long belt drive of the molding line and calculates and sends a pulse to the PLC of the molding line, thereby recording the real-time position of the substrate head; Step 3: If a plate contains metal, the metal detector installed above the forming belt will send an alarm signal to the PLC of the forming line. The PLC of the forming line determines which plate the metal alarm is. Step 4: When the sheet containing the metal moves to a specific position, the nose is opened so that the sheet containing the metal falls out of the forming line.

2. The method for automatically opening the nose of a metal alarm in a plywood continuous press production line according to claim 1 is characterized in that: The certain distance in step 1 refers to a distance of 30 to 50 mm between two adjacent plywood boards.

3. The method for automatically opening the nose of a metal alarm in a plywood continuous press production line according to claim 1 is characterized in that: The metal detector is a metal detector from CASSEL of Germany.

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