Material transportation and carrying disc backflow system

Abstract

The invention relates to a material transportation and carrying disc backflow system which comprises at least two adjacent material transportation lines and a carrying disc backflow detection system arranged between the two material transportation lines. The carrying disc backflow detection system comprises a carrying disc backflow line, the carrying disc backflow line is used for conveying carrying discs in the first conveying direction, and the first conveying direction is opposite to the second conveying direction in the material conveying line. A material circulation path of'processing-backflow-reprocessing 'is formed according to a carrier plate backflow line and a material conveying line which are in reverse operation, so that the material conveying line and the carrier plate backflow line are integrated in the same production line, and materials are rapidly transferred in different directions on the premise that the field area is not increased. And through the at least two adjacent material conveying lines and the connection motor connected with the two material conveying lines at the same time, a redundancy mode is provided for the material conveying and carrying disc backflow system, and the overall reliability and stability of the system are further improved.

Description

Technical Field

[0001] The present application relates to the technical field of automatic material conveying, and in particular to a material transport and tray return system. Background Art

[0002] Most of the conveying devices on the market are single-sided devices. If they need to be changed, the line must be stopped and debugged, which affects the effective use time. Conveying devices with multi-sided transmission have a single application scenario and are difficult to cope with complex transportation conditions.

[0003] Chinese patent CN119117577A discloses a material transportation system, a conveying device and an automated production line; including: a first line changing component, a second line changing component and a plurality of material conveying lines, one end of the material conveying line is connected to the first line changing component, and the other end is connected to the second line changing component; the first line changing component and the second line changing component cooperate with a plurality of material conveying lines to form a serial transmission state and a parallel transmission state.

[0004] Although the above scheme solves to a certain extent the problems of the existing conveying device requiring line change and debugging and the single multilateral transmission application scenario through the cooperation of the first line changing component, the second line changing component and several material conveying lines; however, due to the lack of real-time detection means for the material transportation and carrier return process in the first line changing component and the second line changing component, the conversion between the serial transmission state and the parallel transmission state mainly depends on the preset program to switch the transmission mode; however, in the actual production process, when a carrier on a material conveying line or a carrier return line is suddenly congested for some reason, there is no corresponding sensor or detection device in the system that can perceive this abnormal situation in time, resulting in the system being unable to timely understand whether the carrier return is affected, which in turn has a chain reaction on the overall material transportation efficiency.

[0005] Therefore, we propose a material transportation and tray return system. Summary of the invention

[0006] The main purpose of the present application is to provide a material transportation and tray return system, aiming to solve the problem in the prior art that in the event of sudden congestion, the system still switches according to a fixed cycle, resulting in more trays being directed to the already congested line, thereby further aggravating the congestion.

[0007] To achieve the above-mentioned purpose, the present application provides a material transportation and tray return system, comprising: at least two adjacent material transportation lines, and a tray return detection system arranged between the two material transportation lines; the tray return detection system comprises: a tray return line, the tray return line is used to transport the tray along a first conveying direction, the first conveying direction is opposite to the second conveying direction in the material transportation line, and is used to form a "processing-reflow-reprocessing" material circulation path according to the tray return line and the material transportation line running in the opposite direction; A first docking motor is provided at one end of the carrier return line, and the first docking motor is close to the incoming end of the material transport line; a second docking motor is provided at the other opposite end of the carrier return line, and the second docking motor is far away from the incoming end of the material transport line; a sensor array is provided on both the first docking motor and the second docking motor, and the sensor array is used to detect the position and state information of the carrier, and accurately control the transfer process of the carrier based on the detected information; The sensor array includes: a through-beam photoelectric sensor, a reflective photoelectric sensor and a slot-type photoelectric sensor. The through-beam photoelectric sensor is fixedly mounted at the input end of the first docking motor and / or the second docking motor, and is arranged at an angle relative to the intersection of the material transportation line and the carrier return line, so as to detect whether the carrier is about to enter the working range of the docking motor; the reflective photoelectric sensor is fixedly mounted at the output end of the first docking motor and / or the second docking motor, and is a projection setting of the through-beam photoelectric sensor, so as to detect whether the carrier has completely left the working range of the docking motor; the slot-type photoelectric sensors are linearly arranged on the conveying track of the first docking motor and / or the second docking motor, and the slot openings thereof are opposite to the position where the carrier will pass during the transfer process, so as to detect the position information of the carrier during its movement in real time.

[0008] Preferably, the first docking motor and the second docking motor are both provided with an encoder, the input end of the encoder is connected to the first docking motor or the second docking motor, and is used to obtain key parameters during the operation of the motor, and the output end of the encoder is connected to the control system, and is used to transmit the obtained motor operation parameters to the control system in real time.

[0009] More preferably, the encoder forms a closed-loop control system by detecting the speed, direction and position information of the motor, combined with the position, speed and state data of the carrier provided by the sensor array; The closed-loop control system is specifically as follows: when the encoder detects that the motor speed is abnormal, the control system will immediately combine the feedback information of the sensor array to determine whether the carrier is in the correct position. If the carrier position deviates, the control system will quickly adjust the motor speed or direction to ensure that the carrier can complete the transfer according to the predetermined trajectory.

[0010] Preferably, pressure sensors are linearly arranged on the conveying track of the carrier tray return line to ensure that the carrier tray returns to the starting position of the material transportation line smoothly and reliably.

[0011] Preferably, the pressure sensor is connected to a closed-loop control system, which specifically includes the following steps: The pressure data of the carrier applied to the conveying track of the carrier return line is periodically obtained through the pressure sensor; The pressure data obtained in the above steps are compared in real time with the preset safety pressure threshold; when the obtained pressure data is greater than the safety pressure threshold, the pressure sensor continues to detect the pressure applied by the carrier to the track during the reflow process; when the obtained pressure data is less than or equal to the safety pressure threshold, the pressure sensor stops the detection of the current cycle and waits for the arrival of the next detection cycle; When the pressure data obtained by the pressure sensor exceeds the safety pressure threshold for three consecutive times or lasts for more than 30 seconds, the control system will automatically send instructions to the docking motor to reduce its driving speed, slow down the movement speed of the carrier during the reflow process, and adjust the tension of the carrier reflow line through the tension adjustment device.

[0012] Preferably, the preset safety pressure threshold Specifically: through formula (1) Calculated; in, It is the basic value of pressure generated by the weight of the carrier; is the pressure increment generated when the carrier speed increases from the initial speed 0 to the normal operating speed 1, It is the additional pressure exerted by the material on the carrier plate.

[0013] Preferably, the safety factor in formula (1) is The range is 1-1.5, and the pressure fluctuation margin The interval is .

[0014] Optionally, the front and rear input ends of the first connecting motor and the second connecting motor connected to the material transport line are also provided with an RFID reader / writer, and the RFID reader / writer is used to identify and track the identity information of the carrier and record the transportation history of the carrier.

[0015] Preferably, the opposing photoelectric sensor is arranged at an oblique angle of 15-55 degrees to the intersection of the material transport line and the carrier return line.

[0016] Preferably, a processing component is provided between the material transport line and the carrier plate return line for further processing the material transmitted from the material transport line.

[0017] The beneficial effects of the technical solution of the present invention are: Through reasonable space planning, the material conveying line and the tray return line are integrated into the same production line, and the rapid transfer of materials in different directions can be achieved without increasing the site area.

[0018] By means of at least two adjacent material transport lines and a connecting motor that simultaneously connects the two material transport lines, a redundant mode is provided for the material transport and tray return system, and the redundant mode is used to further improve the overall reliability and stability of the system. When one of the material transport lines cannot operate normally due to equipment failure, maintenance and repair, or sudden unexpected circumstances, the other material transport line can still continue to undertake the task of transporting materials to ensure that the material flow of the production line will not be interrupted. And with the coordinated action of the connecting motor, the tray return system can also adjust the operating status accordingly to ensure that the tray can be smoothly returned under the new material transport line configuration, thereby minimizing the risk of stagnation of the entire production process due to local failures, and effectively improving production efficiency and overall operational benefits.

[0019] The encoder feeds back the motor's operating information to the control system, which adjusts the speed and operating status of the material transport line based on this information to ensure that the material can be transported evenly and stably. When a material transport line fails, the encoder will promptly feed back the abnormal situation of the connected motor to the control system. The control system coordinates another normal material transport line and the tray return line for adjustment based on the information provided by the encoder.

[0020] At the same time, the encoder monitors the motor's speed, direction and position information in real time and transmits this data to the control system. At the same time, the system combines the carrier position and status information provided by the sensor array to more accurately adjust the operating parameters of the docking motor to ensure the stability and accuracy of the carrier during the transfer process, greatly reducing the risk of the carrier getting stuck or offset during the transfer process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a module structure diagram of a material transport and carrier plate return system in one embodiment of the present application; Figure 2 This is a partial module structure diagram of a material transport and carrier plate return system in another embodiment of the present application; Figure 3 This is a module structure diagram of a material transportation and carrier plate return system in another embodiment of the present application.

[0022] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0024] In addition, if the descriptions of "first", "second", etc. are involved in this application, they are only used for descriptive purposes (such as for distinguishing the same or similar elements), and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0025] See also Figure 1-Figure 2 The present invention proposes a material transportation and tray return system, comprising: at least two adjacent material transportation lines, and a tray return detection system arranged between the two material transportation lines; the tray return detection system comprises: a tray return line, the tray return line is used to transport the tray along a first conveying direction, the first conveying direction is opposite to the second conveying direction in the material transportation line, and is used to form a "processing-reflow-reprocessing" material circulation path according to the tray return line and the material transportation line running in the opposite direction; A first connecting motor is provided at one end of the tray return line, the first connecting motor is close to the incoming end of the material transport line, and is used to drive the tray to smoothly transfer from the tray return line to the material transport line, and restart the material processing and transportation process along the second conveying direction; a second connecting motor is provided at the other opposite end of the tray return line, the second connecting motor is far away from the incoming end of the material transport line, and is used to smoothly transfer the tray from the material transport line to the tray return line, and drive the tray to flow back to the incoming end of the material transport line along the first conveying direction; The first docking motor and the second docking motor are both provided with a sensor array, and the sensor array is used to detect the position and state information of the carrier, and accurately control the transfer process of the carrier based on the detected information; The sensor array includes: a through-beam photoelectric sensor, a reflective photoelectric sensor and a slot-type photoelectric sensor. The through-beam photoelectric sensor is fixedly mounted at the input end of the first docking motor and / or the second docking motor, and is arranged at an angle relative to the intersection of the material transportation line and the carrier return line, so as to detect whether the carrier is about to enter the working range of the docking motor; the reflective photoelectric sensor is fixedly mounted at the output end of the first docking motor and / or the second docking motor, and is a projection setting of the through-beam photoelectric sensor, so as to detect whether the carrier has completely left the working range of the docking motor; the slot-type photoelectric sensors are linearly arranged on the conveying track of the first docking motor and / or the second docking motor, and the slot openings thereof are opposite to the position where the carrier will pass during the transfer process, so as to detect the position information of the carrier during its movement in real time.

[0026] In this embodiment, through reasonable space planning, the material conveying line and the tray return line are integrated into the same production line, and the rapid transfer of materials in different directions can be achieved without increasing the site area.

[0027] Specifically, when the through-beam photoelectric sensor detects that the carrier is about to enter the working range, the control system will start the speed regulation program of the docking motor in advance, so that it waits for the arrival of the carrier at an appropriate speed to ensure that the carrier can smoothly enter the driving area of ​​the motor.

[0028] When the reflective photoelectric sensor detects the carrier leaving signal, the control system will determine whether the carrier leaves according to the predetermined trajectory based on the carrier position information fed back by the slot photoelectric sensor at this time. If there is a deviation, the motor speed or direction will be adjusted quickly to ensure that the carrier can accurately complete the transfer from one transport line to another or the return line.

[0029] When the carrier moves along a specific path driven by the motor, the slot photoelectric sensor can accurately determine the real-time position and operating status of the carrier by detecting the situation where the carrier blocks the light at its slot. If the carrier is offset or the operating speed is abnormal during the transfer process, the slot photoelectric sensor will immediately detect it and pass the relevant information to the control system.

[0030] At the same time, the above embodiment also provides a redundant mode for the material transportation and tray return system through at least two adjacent material transportation lines and a connecting motor that simultaneously connects the two material transportation lines. The redundant mode is used to further improve the overall reliability and stability of the system.

[0031] When one of the material transport lines cannot operate normally due to equipment failure, maintenance or unexpected circumstances, the other material transport line can continue to undertake the material transportation task to ensure that the material flow of the production line will not be interrupted. And under the synergy of the connecting motor, the carrier plate return system can also adjust the operating status accordingly to ensure that the carrier plate can be smoothly returned under the new material transport line configuration, thereby minimizing the risk of stagnation of the entire production process due to local failures and effectively improving production efficiency and overall operational benefits.

[0032] In one embodiment, the first docking motor and the second docking motor are both provided with encoders. Specifically, the input end of the encoder is connected to the first docking motor or the second docking motor for obtaining key parameters during the operation of the motor, and the output end of the encoder is connected to the control system for transmitting the obtained motor operation parameters to the control system in real time.

[0033] In this embodiment, the operation information of the motor is fed back to the control system through the encoder, and the control system adjusts the speed and operation status of the material transportation line according to this information to ensure that the material can be transported evenly and stably. When a material transportation line fails, the encoder will promptly feed back the abnormal situation of the connecting motor to the control system. The control system coordinates another normal material transportation line and the carrier return line for adjustment based on the information provided by the encoder. For example, by adjusting the speed and direction of the connecting motor on the normal material transportation line, the transportation path and speed of the material are changed, so that the carrier can be smoothly transferred to the new material transportation line for continued processing and transportation. At the same time, the carrier return line will also adjust its operating status according to the information fed back by the encoder to ensure that the carrier can accurately return to the incoming end of the material transportation line, thereby realizing redundant operation and optimized configuration of the entire system.

[0034] In one embodiment, the encoder is connected to a sensor array to achieve more accurate tracking of the carrier position and real-time monitoring of the motor operation status. The encoder detects the motor speed, direction and position information, combined with the carrier position, speed and status data provided by the sensor array, to form a closed-loop control system.

[0035] The closed-loop control system is specifically as follows: when the encoder detects that the motor speed is abnormal, the control system will immediately combine the feedback information of the sensor array to determine whether the carrier is in the correct position. If the carrier position deviates, the control system will quickly adjust the motor speed or direction to ensure that the carrier can complete the transfer according to the predetermined trajectory.

[0036] In this embodiment, the encoder monitors the motor's speed, direction and position information in real time, and transmits this data to the control system. At the same time, the system combines the carrier position and status information provided by the sensor array to more accurately adjust the operating parameters of the docking motor, ensuring the stability and accuracy of the carrier during the transfer process, greatly reducing the risk of the carrier getting stuck or offset during the transfer process.

[0037] Furthermore, by real-time monitoring of the motor's operating status and the position of the carrier, the control system can detect potential faults in advance and issue early warning signals. For example, when the encoder detects that the motor speed fluctuates greatly or the sensor array detects that the carrier position frequently shifts, the control system will determine that there may be problems such as motor wear or track deviation, and prompt the operator to perform inspection and maintenance. This preventive maintenance mechanism effectively extends the service life of the equipment and reduces production interruptions caused by sudden failures.

[0038] In one embodiment, the front and rear input ends of the first docking motor and the second docking motor connected to the material transport line are also provided with an RFID reader / writer, and the RFID reader / writer is used to identify and track the identity information of the carrier and record the transportation history of the carrier.

[0039] In this embodiment, when the carrier approaches the input end of the docking motor, the RFID reader will emit electromagnetic waves to activate the RFID tag on the carrier and read the unique identification code stored therein. Through the obtained identification code, the system can accurately identify the identity of each carrier. No matter how the carrier flows on the production line, the system can query its transportation history at any time to ensure the correct tracking and management of the carrier during transportation and reflow.

[0040] In one embodiment, the RFID reader is connected to the closed-loop control system via wireless communication.

[0041] In this embodiment, wireless communication is used to connect the RFID reader and the closed-loop control system to avoid the physical constraints of traditional wired connections, so that the RFID reader can be flexibly placed according to the actual needs of the production site. Whether at the input end of the material transportation line or at other key locations, its position and quantity can be easily adjusted to adapt to different production processes and process requirements. At the same time, a large number of cables, junction boxes and other hardware equipment in traditional connection methods are eliminated.

[0042] Furthermore, during the transportation and return of the carrier, the RFID reader can continuously track and monitor the carrier, and transmit the latest data to the closed-loop control system. The closed-loop control system analyzes and processes the received carrier identity information and status data in combination with the motor operation information detected by the encoder. It also sends precise control instructions to the docking motor and other related equipment through wireless communication to adjust the motor's speed, direction and other parameters to ensure that the carrier can be transferred smoothly and accurately according to the predetermined trajectory.

[0043] In one embodiment, the opposing photoelectric sensor is arranged at an angle of 15-55 degrees to the intersection of the material transport line and the carrier return line.

[0044] In this embodiment, a through-beam photoelectric sensor installed at a specific oblique angle is used, and the path of its emission and reception of light forms a more favorable geometric relationship with the material transportation direction. Compared with the installation method perpendicular to the transportation line or parallel to the transportation line, the oblique angle of 15-55 degrees can significantly reduce the detection blind area between the sensor and the carrier. Therefore, during the material transportation process, when the carrier gradually approaches the intersection of the transportation line and the return line, the sensor can detect the existence of the carrier earlier and more reliably, avoiding the missed detection caused by the carrier being in the sensor blind area at the intersection, and ensuring the smoothness and reliability of the entire material transportation and return process.

[0045] In one embodiment, pressure sensors are linearly arranged on the conveying track of the carrier return line, and the pressure sensors periodically detect the pressure applied by the carrier on the track during the return process to ensure that the carrier smoothly and reliably returns to the starting position of the material transportation line.

[0046] Further, the pressure sensor is connected to a closed-loop control system, which specifically includes the following steps: The pressure data of the carrier applied to the conveying track of the carrier return line is periodically obtained through the pressure sensor; The pressure data obtained in the above steps are compared in real time with the preset safety pressure threshold; when the obtained pressure data is greater than the safety pressure threshold, the pressure sensor continues to detect the pressure applied by the carrier to the track during the reflow process; when the obtained pressure data is less than or equal to the safety pressure threshold, the pressure sensor stops the detection of the current cycle and waits for the arrival of the next detection cycle; When the pressure data obtained by the pressure sensor exceeds the safety pressure threshold for three consecutive times or lasts for more than 30 seconds, the control system will automatically send instructions to the docking motor to reduce its driving speed, slow down the movement speed of the carrier during the reflow process, and adjust the tension of the carrier reflow line through the tension adjustment device.

[0047] In this embodiment, the full-section rail pressure monitoring is achieved through a linearly distributed sensor array, and a closed-loop feedback mechanism is constructed by combining real-time data comparison. When the pressure is detected to be continuously abnormal, the system can trigger the dual adjustment of speed reduction and tension compensation within 30 seconds, effectively preventing track deformation accidents caused by carrier displacement, material accumulation or mechanical jamming.

[0048] On the other hand, the dual threshold judgment strategy of "exceeding the limit three times / timeout for 30 seconds" is adopted to avoid false operation caused by instantaneous interference and ensure rapid response to real faults. And by connecting the gradient speed regulation of the motor and coordinating the tension device, a smooth transition of the carrier motion state is achieved to ensure continuous operation of the production line.

[0049] In one embodiment, the preset safety pressure threshold Specifically: through formula (1) Calculated; in, It is the basic value of pressure generated by the weight of the carrier; is the pressure increment generated when the carrier speed increases from the initial speed 0 to the normal operating speed 1, It is the additional pressure exerted by the material on the carrier plate.

[0050] In this embodiment, the pressure exerted by the carrier on the track under different working conditions can be considered more comprehensively, thereby providing an accurate judgment basis for the closed-loop control system, effectively preventing various problems caused by abnormal pressure, and ensuring the stable operation of the material transportation line and the carrier return line.

[0051] In one embodiment, the safety factor in formula (1) is The range is 1-1.5, and the pressure fluctuation margin The interval is .

[0052] In one embodiment, a loading device is further provided at the incoming end of the material transport line for loading the material to be processed onto a carrier plate.

[0053] See also Figure 3 In one embodiment, a processing component is provided between the material transport line and the carrier return line for further processing the material transmitted from the material transport line.

[0054] For example, the processing components include: toner UV curing reservation, cleaning station, glue filling station, fastening station and reservation station.

[0055] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, device, article or material transport and tray reflow system including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, device, article or material transport and tray reflow system. In the absence of more restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, device, article or material transport and tray reflow system including the element.

[0056] The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A material transport and tray return system, characterized in that: include: At least two adjacent material transport lines, and a tray return flow detection system disposed between the two material transport lines; The tray return detection system comprises: a tray return line, the tray return line is used to transport the tray along a first transport direction, the first transport direction is opposite to the second transport direction in the material transport line, and is used to form a "processing-reflow-reprocessing" material circulation path according to the tray return line and the material transport line running in the opposite direction; A first docking motor is provided at one end of the carrier return line, and the first docking motor is close to the incoming end of the material transport line; a second docking motor is provided at the other opposite end of the carrier return line, and the second docking motor is far away from the incoming end of the material transport line; a sensor array is provided on both the first docking motor and the second docking motor, and the sensor array is used to detect the position and state information of the carrier, and accurately control the transfer process of the carrier based on the detected information; The sensor array includes: a through-beam photoelectric sensor, a reflective photoelectric sensor and a slot-type photoelectric sensor. The through-beam photoelectric sensor is fixedly mounted at the input end of the first docking motor and / or the second docking motor, and is arranged at an angle relative to the intersection of the material transportation line and the carrier return line, so as to detect whether the carrier is about to enter the working range of the docking motor; the reflective photoelectric sensor is fixedly mounted at the output end of the first docking motor and / or the second docking motor, and is a projection setting of the through-beam photoelectric sensor, so as to detect whether the carrier has completely left the working range of the docking motor; the slot-type photoelectric sensors are linearly arranged on the conveying track of the first docking motor and / or the second docking motor, and the slot openings thereof are opposite to the position where the carrier will pass during the transfer process, so as to detect the position information of the carrier during its movement in real time.

2. A material transport and tray return system according to claim 1, characterized in that: The first docking motor and the second docking motor are both provided with an encoder, the input end of the encoder is connected to the first docking motor or the second docking motor for obtaining key parameters during the operation of the motor, and the output end of the encoder is connected to the control system for transmitting the obtained motor operation parameters to the control system in real time.

3. A material transport and tray return system according to claim 2, characterized in that: The encoder forms a closed-loop control system by detecting the speed, direction and position information of the motor and combining the position, speed and status data of the carrier provided by the sensor array; The closed-loop control system is specifically as follows: when the encoder detects that the motor speed is abnormal, the control system will immediately combine the feedback information of the sensor array to determine whether the carrier is in the correct position. If the carrier position deviates, the control system will quickly adjust the motor speed or direction to ensure that the carrier can complete the transfer according to the predetermined trajectory.

4. A material transport and tray return system according to claim 3, characterized in that: Pressure sensors are linearly arranged on the conveying track of the carrier tray return line to ensure that the carrier tray returns to the starting position of the material transportation line smoothly and reliably.

5. A material transport and tray return system according to claim 4, characterized in that: The pressure sensor is connected to a closed-loop control system, which specifically includes the following steps: The pressure data of the carrier applied to the conveying track of the carrier return line is periodically obtained through the pressure sensor; The pressure data obtained in the above steps are compared in real time with the preset safety pressure threshold; when the obtained pressure data is greater than the safety pressure threshold, the pressure sensor continues to detect the pressure applied by the carrier to the track during the reflow process; when the obtained pressure data is less than or equal to the safety pressure threshold, the pressure sensor stops the detection of the current cycle and waits for the arrival of the next detection cycle; When the pressure data obtained by the pressure sensor exceeds the safety pressure threshold for three consecutive times or lasts for more than 30 seconds, the control system will automatically send instructions to the docking motor to reduce its driving speed, slow down the movement speed of the carrier during the reflow process, and adjust the tension of the carrier reflow line through the tension adjustment device.

6. A material transport and tray return system according to claim 5, characterized in that: The pre-set safety pressure threshold Specifically: through formula (1) Calculated; in, It is the basic value of pressure generated by the weight of the carrier; is the pressure increment generated when the carrier speed increases from the initial speed 0 to the normal operating speed 1, It is the additional pressure exerted by the material on the carrier plate.

7. A material transport and tray return system according to claim 6, characterized in that: The safety factor in formula (1) is The range is 1-1.5, and the pressure fluctuation margin The interval is .

8. A material transport and tray return system according to claim 1, characterized in that: The front and rear input ends of the first connecting motor and the second connecting motor connected to the material transport line are also provided with RFID readers, and the RFID readers are used to identify and track the identity information of the carrier and record the transportation history of the carrier.

9. A material transport and tray return system according to claim 1, characterized in that: The opposing photoelectric sensor is arranged at an oblique angle of 15-55 degrees at the intersection of the material transport line and the carrier return line.

10. A material transport and tray return system according to claim 1, characterized in that: A processing component is provided between the material transport line and the carrier plate return line for further processing the material transmitted from the material transport line.

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