An electronic tray string lifting device with adaptive material height

Abstract

The utility model provides a kind of electronic material disc material string lifting device of self-adapting material height, including material tower, tray, lifting module and transmission module.Lifting module includes sensor, motor, ball screw, slide rail sliding block and controller, sensor detects top tray state of taking, controller drives motor to make tray ascend along slide rail sliding block by ball screw, keeps feeding height.Transmission module includes track, motor roller and electromagnet, motor roller drives material string to move to material tower specified position along track, electromagnet adsorbs material string bottom plate locking position.The device realizes tray height self-adapting adjustment and material string accurate positioning, overcome the height adjustment lag and material string deviation problem in the prior art, improve the continuity, stability and efficiency of SMT production line feeding.

Description

Technical Field

[0001] This utility model relates to the field of electronic material conveying technology, specifically to an electronic material tray lifting device that adapts to the height of the material. Background Technology

[0002] Electronic component tray lifting devices are widely used in the electronics manufacturing industry, especially in surface mount technology (SMT) production lines, to automate the feeding of electronic component trays. As electronic products develop towards miniaturization, high precision, and high efficiency, the role of automated feeding equipment in SMT production lines is becoming increasingly important. As the main carrier of electronic components, the continuity and stability of tray feeding directly affect production efficiency and product quality. In recent years, the electronics manufacturing industry has placed higher demands on the automation, adaptability, and accuracy of feeding devices, driving the evolution of tray lifting devices from manual operation to intelligent and automated operation. Modern feeding equipment not only needs to achieve rapid tray transport and positioning but also needs to have the ability to dynamically adjust the feeding height according to the production cycle to adapt to different models of placement machines and production needs. Lifting devices typically combine sensors, motors, and transmission mechanisms to achieve automatic tray replenishment and positioning through precise control. However, existing technologies still have many shortcomings in the automated transport, positioning, and height adaptive adjustment of trays, limiting the application of equipment in complex production scenarios.

[0003] Existing tray lifting devices have significant shortcomings in height adjustment. Many devices use fixed-height lifting mechanisms, requiring manual adjustment of the feeding height to accommodate the different pick-and-place machine requirements. This method is not only inefficient, but also prone to errors due to manual operation during frequent tray changes or production line switching, affecting the continuity of feeding. While some automated lifting devices are equipped with motors and transmission mechanisms, they lack the ability to detect the tray's usage status in real time. When the top tray is removed, the device cannot promptly sense and adjust the tray height, causing subsequent trays to fail to reach the feeding position quickly, resulting in production interruptions or reduced efficiency. This lag in height adjustment is particularly pronounced in high-cycle production, directly impacting the overall efficiency of the SMT production line.

[0004] Existing technologies also have shortcomings in material string conveying. Traditional material string conveying typically relies on manual pushing or simple mechanical rollers, lacking precise drive and positioning mechanisms. When the material string is fed into the designated position on the conveying tower, the conveying process is prone to deviation due to track friction or uneven weight distribution of the material string, causing the material string to fail to reach the intended position accurately. Existing conveying devices generally use mechanical limiters or spring clamping structures for material string positioning and fixing. While these methods are simple, they are prone to failure due to vibration or mechanical wear during high-speed conveying or frequent operation, resulting in unstable material string position and affecting the accuracy of subsequent lifting operations.

[0005] To address the aforementioned issues, some existing technologies attempt to optimize height adjustment by introducing sensors and control systems. For example, some devices use photoelectric sensors to detect the retrieval status of the material tray, coordinating with a motor-driven screw or belt to automatically raise the material string. However, these solutions have limited sensor sensitivity and response speed, making them unsuitable for rapid material retrieval scenarios, and the system complexity increases maintenance costs. Regarding conveying and positioning, some equipment introduces electric rollers to drive the material string movement, but its positioning still relies on mechanical structures, failing to effectively solve the problem of material string offset at the end of the conveyor. Existing electromagnetic positioning technology is mostly used in other fields and has not yet been widely applied to the precise positioning of material trays and strings, limiting its promotion in electronics manufacturing.

[0006] This application aims to address the shortcomings of existing material string lifting devices in terms of height adaptive adjustment and conveying positioning, and to provide a device that can automatically detect the material string picking status and adjust the feeding height in real time, while achieving precise fixing of the material string through electromagnetic positioning, so as to improve the stability and efficiency of material feeding in SMT production lines. Utility Model Content

[0007] To address the aforementioned technical problems, this utility model provides an adaptive electronic tray material string lifting device. Its purpose is to automatically detect the top tray's usage status and drive the material string upward, maintaining a stable feeding height. Simultaneously, it utilizes an electric roller and electromagnet to achieve precise delivery and fixation of the material string, effectively preventing material string deviation, improving the continuity and stability of material supply in the SMT production line, and increasing production efficiency.

[0008] An adaptive material height electronic tray lifting device includes a material tower and a tray for carrying the material string, the device further includes:

[0009] The lifting module includes a sensor, a motor, a transmission mechanism, and a guide rail slider;

[0010] The sensor is fixedly installed on the inner wall of the top of the material tower to detect the usage status of the top material tray in real time and output a detection signal; the guide rail slider is fixedly installed on the inner wall of the material tower and extends in the vertical direction.

[0011] The tray is slidably engaged with the guide rail slider, and the tray moves vertically inside the material tower via the guide rail slider;

[0012] The motor is fixedly installed at the bottom of the material tower. The output shaft of the motor is connected to the tray through the transmission mechanism. The transmission mechanism includes a lead screw or a belt. The transmission mechanism is fixedly connected to the tray to drive the tray to rise along the guide rail slider. The motor drives the transmission mechanism according to the detection signal of the sensor to raise the tray to a predetermined feeding height to maintain the feeding position of the top tray of the material string.

[0013] A conveying module, comprising a track, an electric roller, and an electromagnet; the track is fixedly installed on the outside of the material tower and extends horizontally to guide the movement of the material string;

[0014] The electric roller is fixedly installed at the bottom of the track, and the roller surface of the electric roller contacts the bottom of the material string to drive the material string to slide along the track to the designated position of the material tower;

[0015] The electromagnet is fixedly installed at the end of the track. The adsorption surface of the electromagnet is arranged opposite to the magnetic area at the bottom of the material string. When the electromagnet is energized, it generates an attractive force to attract and lock the bottom of the material string, preventing the material string from shifting during subsequent operations in the material tower.

[0016] Furthermore, the sensor is a photoelectric sensor, which is fixedly installed at the center of the inner wall of the top of the material tower, and is used to detect the retrieval status of the top material tray by emitting and receiving light signals.

[0017] Furthermore, the transmission mechanism is a lead screw transmission mechanism, which includes a lead screw and a nut that is threadedly engaged with the lead screw. The nut is fixedly connected to the bottom of the tray, and the bottom end of the lead screw is coaxially fixedly connected to the output shaft of the motor.

[0018] Furthermore, the electric roller includes a roller and a drive motor. The roller is rotatably connected to the bottom of the track via a bearing, and the drive motor is fixedly installed on one side of the track. The output shaft of the drive motor is coaxially and fixedly connected to the central shaft of the roller.

[0019] Furthermore, the top inner wall of the material tower is also provided with a positioning groove, which is fixedly engaged with the sensor to fix the installation position of the sensor and ensure that its detection direction is towards the top tray of the material string.

[0020] Furthermore, it also includes a safety light curtain, which comprises multiple infrared transmitters and receivers, which are symmetrically fixed on opposite sides of the entrance to the sorting area to form a detection light curtain covering the entire entrance.

[0021] Furthermore, the track includes two parallel guide rails, the top surface of which slides in contact with the bottom of the material string, and a gap is formed between the guide rails to accommodate the rollers of the electric drum.

[0022] Furthermore, the magnetic region at the bottom of the material string is made of ferromagnetic material, which is embedded in the bottom surface of the material string and positioned opposite to the adsorption surface of the electromagnet.

[0023] Furthermore, the top surface of the tray is provided with a plurality of positioning protrusions, which correspond to and cooperate with the positioning holes at the bottom of the material string to restrict the horizontal movement of the material string on the tray.

[0024] Furthermore, the lifting module also includes a controller, which is electrically connected to the sensor and the motor. The controller is fixedly installed on the bottom outer wall of the material tower and is used to receive the detection signal from the sensor and control the motor to drive the transmission mechanism.

[0025] The adaptive material height electronic tray lifting device provided by this utility model has the advantage of automatically adjusting the tray height through a lifting module. Sensors in the lifting module are fixedly installed on the inner wall of the top of the material tower, enabling real-time detection of the top tray's usage status and transmitting the detection signal to the controller. The controller drives a motor based on the signal, which, through a lead screw or belt drive mechanism, raises the tray along the guide rail slider, thus maintaining the top tray of the material string at the required feeding height for the pick-and-place machine. This adaptive adjustment mechanism effectively avoids the cumbersome manual adjustment required by traditional fixed-height devices, significantly reducing the risk of production interruptions due to height errors and improving the continuity and efficiency of the SMT production line.

[0026] The device's conveying module achieves precise conveying and positioning of the material string through the coordinated operation of an electric roller and an electromagnet. The electric roller, mounted at the bottom of the track, drives the material string steadily along the horizontal track to the designated position on the tower. Compared to traditional manual pushing or simple mechanical rollers, its drive is smoother and reduces deviations caused by friction or uneven weight distribution. The electromagnet at the end of the track is energized when the material string reaches the designated position, generating an attractive force that binds to the magnetic area at the bottom of the string, ensuring its stable position during subsequent lifting operations. The electromagnet's precise locking function overcomes the shortcomings of traditional mechanical limiters or spring clamps, which are prone to failure due to vibration or wear, significantly improving the reliability and operational accuracy of the material string positioning.

[0027] Furthermore, the photoelectric sensor design and positioning groove of the sensor make the detection of the top tray more accurate and the installation position stable, ensuring that the detection direction is always aligned with the top of the material string, reducing the possibility of misjudgment. The optimized design of the lead screw drive mechanism, through the fixed connection between the nut and the tray and the coaxial connection between the lead screw and the motor output shaft, ensures transmission efficiency and smooth movement. The cooperation between the positioning protrusion on the top of the tray and the positioning hole at the bottom of the material string further restricts the horizontal movement of the material string, enhancing the stability of the overall structure. The organic combination of these technical features enables this invention to operate efficiently and stably in complex production scenarios, significantly improving the automation level and production efficiency of SMT production lines, and providing a reliable material supply solution for the electronics manufacturing industry. Attached Figure Description

[0028] Appendix Figure 1 This is a schematic diagram of the overall structure of the present invention in its initial state;

[0029] Appendix Figure 2 This is a schematic diagram of the lifting platform of this utility model operating at a high position;

[0030] Appendix Figure 3 This is a schematic diagram of the internal structure of the lifting module of this utility model;

[0031] Appendix Figure 4 This is a schematic diagram of the material string tooling of this utility model;

[0032] Appendix Figure 5 This is a schematic diagram showing the working state of the transmission module of this utility model;

[0033] Appendix Figure 6 This is a partially enlarged schematic diagram of the electromagnet adsorbing and fixing the bottom plate of the material string according to this utility model.

[0034] Figure reference numerals: Intermediate material spool rod - 1 Material tray stack - 2 Material spool frame - 3 Material tray lifting module - 4 Material tray lifting platform (low position) - 5 Material tray detection sensor - 6 Material tray - 7 Lifting position sensor - 8 Material tray lifting platform (high position) - 9 Ball screw - 10 Slide rail slider - 11 Lifting platform - 12 Servo motor - 13 Material tray lifting support plate - 14 Material spool handrail - 15 Material spool rod bottom cylinder - 16 Material spool side roller - 17 Material spool bottom plate - 18 Fully loaded material tray material spool - 19 Material spool positioning electromagnet - 20 Proximity detection sensor - 21 Material spool conveyor roller - 22 Electromagnet adsorption base plate - 23 Detailed Implementation

[0035] The technical solution of this utility model will now be clearly and completely described in conjunction with the accompanying drawings. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The utility model will be further described below with reference to the accompanying drawings.

[0037] This invention provides an adaptive electronic tray material string lifting device, aiming to solve the problems of lagging tray feeding height adjustment and inaccurate material string conveying and positioning in existing technologies. This device achieves automatic adjustment of the tray height and precise conveying and fixing of the material string through the coordinated operation of the lifting module and the conveying module. (See attached diagram) Figure 1 As shown, the device includes an intermediate material feeder 1, a tray stack 2, a material feeder fixture 3, a tray stack lifting module 4, a tray lifting platform at a low position 5, and a tray detection sensor 6, which together constitute the feeding system inside the material tower. The intermediate material feeder 1 is a cylindrical steel rod arranged vertically and fixed to the center of the material tower to support the tray stack 2 and ensure its stability during lifting. The tray stack 2 is formed by stacking multiple trays 7, each tray 7 being a rectangular plastic pallet that carries electronic components and has a positioning groove at its bottom to ensure stack alignment. The tray stack fixture 3 is a metal frame structure, bolted to the bottom of the intermediate material feeder 1, supporting the tray stack 2 to form a fully loaded material feeder 19. The tray stack lifting module 4 integrates lifting-related components and is installed inside the material tower to drive the tray stack 2 upward. The tray lifting platform at a low position 5 is the initial position of the lifting platform, located at the bottom of the material tower, supporting the material feeder fixture 3. The material tray detection sensor 6 is fixed to the inner wall of the top of the material tower and is used to monitor the retrieval status of the material tray 7 at the top of the material tray stack 2.

[0038] Specifically, the lifting module includes a material tray 7, a lifting position detection sensor 8, a material tray lifting platform to the highest position 9, a ball screw 10, a slide rail slider 11, a lifting platform 12, and a servo motor drive 13, as shown in the attached diagram. Figure 2 and attached Figure 3 As shown. The tray 7 is a component of the tray stack 2, employing a standardized design for easy pick-and-place machine retrieval. The tray detection sensor 6 is a photoelectric sensor, bolted to the center of the inner wall of the top of the tower. Its detection direction for emitting and receiving light signals is perpendicular to the top of the tray stack 2, ensuring accurate detection of the tray 7's retrieval status. A positioning groove is provided on the inner wall of the top of the tower, tightly fitting with the housing of the tray detection sensor 6 to ensure stable installation. The lifting position detection sensor 8 is a photoelectric sensor, fixed to the inner wall of the tower near the top, with its detection direction facing the lifting platform 12, used to confirm whether the lifting platform 12 has reached the tray lifting platform to its high position 9. The servo motor drive 13 is bolted to the bottom of the tower, its output shaft coaxially connected to the bottom end of the ball screw 10. The ball screw 10 is a high-precision transmission component, vertically positioned, its top rotatably connected to the inner wall of the top of the tower via a bearing, its axis parallel to the sliding direction of the slide rail slider 11. The ball screw 10 is threaded into a nut, which is fixed to the bottom of the lifting platform 12 by bolts. The slide rail slider 11 includes two parallel slide rails, fixed to both sides of the inner wall of the tower, extending vertically. The lifting platform 12 slides with the slide rails to ensure smooth lifting. The controller is fixed to the outer wall of the bottom of the tower and electrically connected to the tray detection sensor 6, the lifting position detection sensor 8, and the servo motor drive 13. When the tray detection sensor 6 detects that the top tray 7 has been removed, the controller receives the signal and drives the servo motor drive 13 to operate. Through the ball screw 10, the lifting platform 12 is raised from the low position 5 of the tray lifting platform to the high position 9 of the tray lifting platform, maintaining the feeding height of the top tray 7 of the tray stack 2.

[0039] The conveyor module is used to feed the material string 19, which is fully loaded with a material tray, into the material tower. It includes a material string conveyor roller 22, a material string arrival adsorption electromagnet 20, a proximity detection sensor 21, and a material string base plate 18, as shown in the attached diagram. Figure 5 and attached Figure 6As shown. The material string conveyor roller 22 is fixed to the outside of the material tower and extends horizontally. It consists of two parallel aluminum alloy guide rails with flat top surfaces that slide in contact with the bottom surface of the material string base plate 18. The material string base plate 18 is a rectangular steel plate fixed to the bottom of the material string fixture 3, with a magnetic area made of ferromagnetic material embedded in the center of its bottom surface. The roller pulleys 17 on both sides of the material string are multiple cylindrical rollers that are rotatably connected to the gaps between the guide rails via bearings. The surface of the rollers contacts the bottom surface of the material string base plate 18. The roller pulleys 17 on both sides of the material string are driven by a drive motor, which is fixed to one side of the guide rail via a bracket. Its output shaft is coaxially fixed to the central shaft of the roller and drives the rollers to rotate via chain transmission, driving the material string fixture 3 to move along the guide rail to the designated position on the material tower. The proximity detection sensor 21 is an inductive sensor fixed at the end of the guide rail near the material tower inlet to detect whether the material string base plate 18 has reached the designated position. The material string positioning electromagnet 20 is fixed to the end of the guide rail by bolts, with its adsorption surface perpendicular to the magnetic area of ​​the material string base plate 18. When the proximity sensor 21 confirms that the material string fixture 3 is in place, the material string positioning electromagnet 20 is energized, generating a strong magnetic force to attract the material string base plate 18, as shown in the attached diagram. Figure 6 As shown, the electromagnet attracts the bottom plate 23 of the material string, ensuring that the position of the material string tooling 3 is fixed.

[0040] To ensure the stability of the material string fixture 3 during the lifting process, the material tray lifting support plate 14, the material string handrail 15, and the bottom mounting cylinder 16 of the material string rod are integrated into the material string fixture 3, as shown in the attached figure. Figure 4 As shown. The material tray lifting support plate 14 is a rectangular steel plate, fixed to the top of the lifting platform 12. Its top surface has multiple cylindrical positioning protrusions that precisely match the circular positioning holes at the bottom of the material string base plate 18, restricting the horizontal movement of the material string fixture 3 through an interference fit. The material string handles 15 are two L-shaped steel handles, bolted to both sides of the material string base plate 18, assisting in manual handling of the material string fixture 3 and maintaining its stability during transport. The bottom mounting cylinder 16 of the material string rod is a hollow cylindrical structure, welded to the center of the material string base plate 18. Its inner wall is threadedly connected to the bottom of the intermediate material string rod 1, ensuring firm support for the material tray stack 2. The material string base plate 18 is bolted to the bottom of the material string fixture 3, forming the bottom support structure for the fully loaded material string 19.

[0041] In actual operation, the material string 19, fully loaded with material trays, is conveyed to the material tower inlet via the material string conveyor roller line 22, as shown in the attached diagram. Figure 5 As shown in the attached diagram. The rollers 17 on both sides of the material string drive the bottom plate 18 of the material string to slide along the guide rails. When the proximity sensor 21 detects that the bottom plate 18 of the material string has reached the designated position, the electromagnet 20 is energized, attracting the bottom plate 18 and creating a state where the electromagnet holds the bottom plate 23 of the material string. Figure 6As shown, the precise positioning of the material string fixture 3 is completed. The lifting module then starts, and the servo motor drive 13 drives the material tray lifting plate 14 to rise through the ball screw 10 and the slide rail slider 11, adjusting the material tray lifting platform from the low position 5 to the high position 9. When the material tray detection sensor 6 detects that the top material tray 7 has been taken away by the pick-and-place machine, it triggers the controller to drive the servo motor drive 13 to continue running, and the ball screw 10 drives the lifting platform 12 to rise until the detection sensor 8 confirms that the material tray stack 2 has reached the predetermined feeding height. The tray stacking and lifting module 4 integrates the intermediate material string rod 1, tray stacking 2, tray 7, tray detection sensor 6, lifting position detection sensor 8, tray lifting platform to high position 9, ball screw 10, slide rail slider 11, lifting platform 12, servo motor drive 13, and tray lifting support plate 14. Through the coordinated work of the material string tooling 3, material string handrail 15, bottom mounting cylinder of the material string rod 16, rollers and pulleys on both sides of the material string 17, material string base plate 18, material string with full tray 19, material string position adsorption electromagnet 20, proximity detection sensor 21, and material string transport roller line 22, it effectively overcomes the problems of height adjustment lag and material string deviation in the existing technology, and significantly improves the continuity, stability, and production efficiency of material supply in the SMT production line.

[0042] The above are merely preferred embodiments of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Other parts of this utility model not described in detail belong to the prior art and will not be elaborated upon here.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An adaptive material height electronic tray lifting device, comprising a material tower and a tray for supporting the material string, characterized in that, The device further includes: The lifting module includes a sensor, a motor, a transmission mechanism, and a guide rail slider; The sensor is fixedly installed on the inner wall of the top of the material tower to detect the usage status of the top material tray in real time and output a detection signal; the guide rail slider is fixedly installed on the inner wall of the material tower and extends in the vertical direction. The tray is slidably engaged with the guide rail slider, and the tray moves vertically inside the material tower via the guide rail slider; The motor is fixedly installed at the bottom of the material tower. The output shaft of the motor is connected to the tray through the transmission mechanism. The transmission mechanism includes a lead screw or a belt. The transmission mechanism is fixedly connected to the tray to drive the tray to rise along the guide rail slider. The motor drives the transmission mechanism according to the detection signal of the sensor to raise the tray to a predetermined feeding height to maintain the feeding position of the top tray of the material string. A conveying module, comprising a track, an electric roller, and an electromagnet; the track is fixedly installed on the outside of the material tower and extends horizontally to guide the movement of the material string; The electric roller is fixedly installed at the bottom of the track, and the roller surface of the electric roller contacts the bottom of the material string to drive the material string to slide along the track to the designated position of the material tower; The electromagnet is fixedly installed at the end of the track. The adsorption surface of the electromagnet is arranged opposite to the magnetic area at the bottom of the material string. When the electromagnet is energized, it generates an attractive force to attract and lock the bottom of the material string, preventing the material string from shifting during subsequent operations in the material tower.

2. The adaptive material height electronic tray lifting device according to claim 1, characterized in that, The sensor is a photoelectric sensor, which is fixedly installed at the center of the inner wall of the top of the material tower and is used to detect the usage status of the top material tray by emitting and receiving light signals.

3. The adaptive material height electronic tray lifting device according to claim 1, characterized in that, The transmission mechanism is a lead screw transmission mechanism, which includes a lead screw and a nut that is threadedly engaged with the lead screw. The nut is fixedly connected to the bottom of the tray, and the bottom end of the lead screw is coaxially fixedly connected to the output shaft of the motor.

4. The adaptive material height electronic tray lifting device according to claim 1, characterized in that, The electric roller includes a roller and a drive motor. The roller is rotatably connected to the bottom of the track via a bearing. The drive motor is fixedly installed on one side of the track. The output shaft of the drive motor is coaxially and fixedly connected to the central shaft of the roller.

5. The adaptive material height electronic tray lifting device according to claim 1, characterized in that, The top inner wall of the material tower is also provided with a positioning groove, which is fixedly engaged with the sensor to fix the installation position of the sensor and ensure that its detection direction is towards the top tray of the material string.

6. The adaptive material height electronic tray lifting device according to claim 1, characterized in that, It also includes a safety light curtain, which comprises multiple infrared transmitters and receivers, which are symmetrically fixed on opposite sides of the entrance to the sorting area to form a detection light curtain covering the entire entrance.

7. The adaptive material height electronic tray lifting device according to claim 1, characterized in that, The track includes two parallel guide rails, the top surface of which slides in contact with the bottom of the material string, and a gap is formed between the guide rails to accommodate the rollers of the electric drum.

8. The adaptive material height electronic tray lifting device according to claim 1, characterized in that, The magnetic region at the bottom of the material string is made of ferromagnetic material, which is embedded in the bottom surface of the material string and positioned opposite to the adsorption surface of the electromagnet.

9. The adaptive material height electronic tray lifting device according to claim 1, characterized in that, The top surface of the tray is provided with multiple positioning protrusions, which correspond to the positioning holes at the bottom of the material string to restrict the horizontal movement of the material string on the tray.

10. The adaptive material height electronic tray lifting device according to claim 1, characterized in that, The lifting module also includes a controller, which is electrically connected to the sensor and the motor. The controller is fixedly installed on the bottom outer wall of the material tower and is used to receive the detection signal from the sensor and control the motor to drive the transmission mechanism.

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