Full-automatic cutting and membrane stacking device and process for reverse osmosis membrane element

Abstract

The invention discloses a full-automatic cutting and membrane stacking device and process for a reverse osmosis membrane element, and belongs to the technical field of water treatment equipment manufacturing. The device comprises a rack, a feeding module, a cutting module and a stacking module, wherein the feeding module, the cutting module and the stacking module are installed on the rack. And the feeding module adopts a driving and driven roller structure driven by a servo motor and is used for accurately controlling the feeding length of the diaphragm. The cutting module is located on the downstream of the feeding module, reciprocating motion of a cutting blade is achieved through a crank connecting rod mechanism driven by a motor, and the cutting module is matched with a fixed tool apron to complete cutting of the membrane. The stacking module is located under the cutting module and comprises a lead screw lifting platform driven by a lifting motor. Through cooperative automatic operation of all the modules, automation of the whole process from film roll unwinding, fixed-length feeding, accurate cutting to orderly stacking is achieved, the production efficiency and product consistency are remarkably improved, the labor intensity is lowered, and the accuracy of the cutting size and the tidiness of stacking are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of water treatment equipment manufacturing technology, and more specifically, to a membrane processing device for the production process of reverse osmosis membrane elements, and particularly to a fully automatic reverse osmosis membrane element cutting and stacking device and process. Background Technology

[0002] Reverse osmosis (RO) technology is one of the most widely used desalination technologies in modern water treatment, and its core component is the reverse osmosis membrane element. RO membrane elements are typically made by rolling multiple layers of membrane sheets, and the dimensional accuracy, cutting quality, and stacking neatness of these membrane sheets directly affect the performance, reliability, and lifespan of the final membrane element. In the manufacturing process of membrane elements, precisely cutting the rolled composite reverse osmosis membrane material into rectangular membrane sheets of specified dimensions and neatly stacking them is a crucial preparatory step before subsequent membrane winding processes.

[0003] Under current technological conditions, especially in small and medium-sized manufacturing enterprises, the level of automation in this process is generally low, and operators face numerous specific difficulties. A common operating method is purely manual work. Operators first need to move the heavy film rolls to the workbench and manually unroll them. Then, they use a long steel ruler and a utility knife or special cutting knife to mark and cut. This process is not only extremely labor-intensive but also inefficient. Operators need to concentrate intensely to ensure that each cut is accurate and that the cut edges are straight and burr-free. However, due to the inherent errors of human observation and manual operation, the consistency of the cut film dimensions is difficult to guarantee, resulting in significant dimensional fluctuations between batches. After cutting, operators must carefully pick up each thin and flexible film sheet and manually align and stack them. Because the film surface is smooth and easily attracted by static electricity, manual alignment and stacking is time-consuming and labor-intensive, and it is extremely difficult to ensure the neatness of the stacking. Often, the corners are misaligned, forming an irregular "tower-like" stack, which causes great trouble for the subsequent automated film winding process and even requires additional manual sorting, which seriously restricts the overall production line capacity.

[0004] To improve this situation, some semi-automated cutting equipment has emerged on the market. For example, a common semi-automatic device includes a simple unwinding rack and a cylinder-driven guillotine-type cutting mechanism. The operator manually pulls the film from the unwinding rack, determining the pull-out length visually or through simple mechanical limits, then uses a foot switch or presses a button to activate the cylinder, which drives the guillotine to press down and complete the cut. The cut film falls into a collection box. While this type of equipment reduces the physical exertion of the cutting action to some extent, it still has at least two significant drawbacks or shortcomings.

[0005] First, the fixed-length feeding accuracy is low and the degree of automation is insufficient. These devices typically rely on manual material handling by operators, and length control depends entirely on the operator's skill and responsibility, making precise and repeatable fixed-length control impossible. Even if some devices add simple encoders for length measurement, their feeding mechanisms are mostly manual or simple friction wheel drives, prone to slippage and accumulating large errors, failing to meet the increasingly stringent dimensional accuracy requirements of high-end membrane elements. Furthermore, the entire feeding and cutting triggering process still requires manual intervention, failing to achieve continuous automated operation. The improvement in production efficiency is limited, essentially remaining a single-step "human-machine collaboration" operation mode, failing to fundamentally solve the dependence on manual labor in the production process.

[0006] Secondly, the stacking function is missing or ineffective. Most semi-automatic equipment only completes the cutting action, with the cut membrane sheets falling freely into a fixed collection box. Due to airflow disturbances during the fall and the lack of effective guidance and support mechanisms, the membrane sheets pile up haphazardly in the box, exhibiting no order whatsoever. Operators must pause the equipment after cutting a certain quantity, remove all the scattered membrane sheets from the box, and then perform time-consuming and laborious manual sorting and stacking. This "cut first, then sort" approach not only fails to solve the stacking problem but also potentially increases operational complexity and leads to secondary damage to the membrane sheets (such as creases and scratches) due to centralized processing. This prevents a smooth transition between the cutting and subsequent processes, creating a significant bottleneck in the production flow and severely impacting the overall automation level of the production line and the stability of product quality.

[0007] Therefore, developing an integrated fully automatic device capable of high-precision fixed-length feeding, high-quality automatic cutting, and high-precision automatic stacking is of great practical significance for improving the manufacturing level of reverse osmosis membrane elements, in order to solve the problems of low production efficiency, high labor intensity, and unstable cutting accuracy and stacking quality in the existing technology. Summary of the Invention

[0008] To address the aforementioned problems, this invention proposes a fully automated reverse osmosis membrane element cutting and stacking device and process, which more accurately solves the problems mentioned in the background art.

[0009] This invention is achieved through the following technical solution: A fully automated reverse osmosis membrane element cutting and stacking device is proposed, comprising a frame and further comprising: a feeding module, mounted on the frame, for conveying membrane sheets along a predetermined path; the feeding module includes an active feed roller and a driven feed roller, which are arranged vertically opposite each other for clamping and conveying the membrane sheets; the feeding module also includes a feed servo motor for driving the active feed roller to rotate; a cutting module, mounted on the frame and located downstream of the feeding module along the membrane sheet conveying path; the cutting module includes a slider that reciprocates vertically, a cutting blade fixed on the slider, and a blade holder fixedly mounted on the frame and located below the cutting blade, the cutting blade cooperating with the blade holder to cut the membrane sheets; and a stacking module, mounted on the frame and located directly below the cutting module, for receiving and stacking the membrane sheets cut by the cutting module; the stacking module includes a lifting platform and a lifting drive mechanism for driving the lifting platform to move vertically.

[0010] Preferably, the feed module further includes a pressure spring disposed above the driven feed roller, which is used to apply pressure to the driven feed roller so that the driven feed roller fits tightly against the active feed roller.

[0011] Preferably, the cutting module further includes a crank-connecting rod mechanism for driving the slider to reciprocate; the crank-connecting rod mechanism includes a cutting motor, a crank connected to the output shaft of the cutting motor, and connecting rods at both ends that are rotatably connected to the crank and the slider, respectively.

[0012] Preferably, the cutting module further includes a vertical guide rail, which is fixedly mounted on the frame, and the two ends of the slider are slidably connected to the vertical guide rail.

[0013] Preferably, the lifting drive mechanism includes a vertically arranged lead screw and a lifting motor that drives the lead screw to rotate; the bottom of the lifting platform is connected to the upper end of the lead screw, and when the lifting motor drives the lead screw to rotate, it drives the lifting platform to rise and fall along the axis of the lead screw.

[0014] Preferably, the stacking module further includes a guide rod, which is vertically arranged and parallel to the lead screw. The guide rod passes through the lifting platform and slides with it to guide the lifting movement of the lifting platform and prevent it from rotating.

[0015] Preferably, the stacking module also includes a lateral guide plate, which is vertically arranged around the lifting platform and extends upward to below the knife holder, for positional constraint of the falling diaphragm.

[0016] Preferably, it also includes an unwinding module, which is mounted on the frame and located upstream of the feed module along the film conveying path. The unwinding module is used to carry and unwind the film roll. Both ends of the unwinding shaft are rotatably mounted on the frame via bearings, and the film roll is sleeved on the unwinding shaft.

[0017] Preferably, the frame includes a base, a support column extending vertically upward from the base, and a top beam connecting the top of the support column; the feed module and the cutting module are both installed between the support columns.

[0018] How to use a fully automated reverse osmosis membrane element cutting and stacking device: The film roll to be cut is placed on the unwinding shaft of the unwinding module. The unwinding shaft is rotatably mounted on the base of the frame via bearings at both ends, ensuring the film roll is securely installed. The installation position and connection of each module are checked to ensure that the feeding module, cutting module, stacking module, and unwinding module are all correctly installed in their respective positions on the frame. The power components, such as the feeding servo motor, cutting motor, and lifting motor, are tested to ensure they are operating normally.

[0019] The unwinding module carries the film roll. As the device starts, the film roll begins to unwind under its own tension or slight external traction, and the film is gradually released from the roll. The feed servo motor of the feed module starts, driving the active feed roller to rotate. Under the action of the pressure spring, the driven feed roller is tightly pressed against the active feed roller, and the film is clamped between the active feed roller and the driven feed roller, and conveyed downstream along a predetermined path.

[0020] When the diaphragm is conveyed to the cutting module, the cutting module begins operation. The cutting motor starts, driving a crank connected to its output shaft to rotate. During the crank's rotation, a connecting rod drives a slider to reciprocate on a vertical guide rail. The vertical guide rail is fixedly mounted on the frame, providing stable guidance for the slider's movement. As the slider moves downward, the cutting blade fixed to it also moves downward, engaging with a blade holder fixed to the frame and located below the cutting blade to cut the diaphragm to the required size. After cutting, the slider moves upward under the action of the crank-connecting rod mechanism, returning to its initial position, ready for the next cut.

[0021] After being cut, the film falls under gravity. The lifting platform of the stacking module is located directly below the cutting module to receive the cut film. As the film is continuously stacked, the lifting drive mechanism starts working. The lifting motor drives the vertically set lead screw to rotate. Since the bottom of the lifting platform is connected to the upper end of the lead screw, the rotation of the lead screw causes the lifting platform to descend along the axis of the lead screw. At the same time, the guide rod is set vertically and parallel to the lead screw, passing through the lifting platform and sliding with it, guiding the lifting movement of the lifting platform and preventing it from rotating, ensuring that the film is stacked neatly. The side guide plates of the stacking module are set vertically around the lifting platform and extend upward to below the cutter holder, constraining the position of the falling film and ensuring that the film falls accurately on the lifting platform, further improving the stacking accuracy.

[0022] Compared with the prior art, the present invention provides a fully automated reverse osmosis membrane element cutting and stacking device and process, which has the following beneficial effects: This invention, by setting up a feeding module consisting of an active feed roller and a driven feed roller precisely controlled by a feed servo motor, utilizes the high-precision positioning capability and closed-loop control characteristics of the servo motor to achieve micron-level precise control and high repeatability of the film conveying length. This results in highly accurate cutting dimensions and extremely high batch-to-batch consistency, fundamentally solving the problems of large cutting dimension errors and poor consistency caused by manual material pulling or simple mechanical feeding in the prior art.

[0023] This invention highly integrates the unwinding module, servo feed module, crank-connecting rod driven cutting module, and automatic lifting stacking module onto a single frame, and coordinates the actions of each motor with a unified control system. This achieves fully automated continuous operation from film roll unwinding, fixed-length conveying, rapid cutting to neat stacking, thus completely replacing manual operation, greatly improving production efficiency and reducing labor costs. It solves the problems of low automation, limited production efficiency, and heavy reliance on manual intervention in semi-automatic equipment in the background technology.

[0024] This invention, by setting up a stacking module directly below the cutting module, includes a lifting platform that automatically and synchronously descends according to the stacking thickness, and lateral guide plates surrounding the platform for guiding and constraining. This ensures that each cut film sheet can fall a short distance under controlled conditions and be accurately positioned on the top of the stack, thereby achieving an effect of extremely neat edges and high stacking quality of the stacked finished product. This solves the problem in the prior art of stacking chaos and misalignment caused by disordered falling and manual sorting, which affects subsequent processes.

[0025] This invention employs a crank-connecting rod mechanism driven by a cutting motor as the actuator of the cutting module, and slides the slider on a vertical guide rail, achieving stable, reliable, and efficient reciprocating cutting motion. Compared to common pneumatic punching methods that rely on air sources, this purely mechanical transmission structure is more compact, easier to maintain, consumes less energy, and operates with less noise. It is unaffected by fluctuations in air source pressure and exhibits higher consistency in action, thereby improving the overall operational stability and durability of the equipment and reducing long-term operating costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front view of the overall structure of the present invention; Figure 3 This is a top view of the overall structure of the present invention; Figure 4 This is a partially enlarged structural diagram of the feed module in this invention; Figure 5 This is a schematic diagram of the driving mechanism of the cutting module in this invention; Figure 6 This is a cross-sectional schematic diagram of the cooperation relationship between the cutting blade and the blade holder in this invention; Figure 7 This is a schematic diagram of the stacking module in this invention.

[0027] 1. Frame; 11. Base; 12. Support column; 13. Top beam; 2. Unwinding module; 21. Unwinding shaft; 22. Film roll; 3. Feed module; 31. Feed servo motor; 32. Active feed roller; 33. Driven feed roller; 34. Pressure spring; 4. Cutting module; 41. Cutting motor; 42. Crank; 43. Connecting rod; 44. Slider; 45. Cutting blade; 46. Blade holder; 47. Vertical guide rail; 5. Stacking module; 51. Lifting platform; 52. Lead screw; 53. Lifting motor; 54. Guide rod; 55. Side guide plate. Detailed Implementation

[0028] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can more fully and accurately understand the technical solution of the present invention. It should be noted that the following embodiments are for illustrating the present invention, and not for limiting the scope of the present invention.

[0029] Please see Figures 1 to 7This embodiment discloses a fully automated reverse osmosis membrane element cutting and stacking device. The overall support structure of the device is a frame 1, which provides a stable installation reference and load-bearing platform for the entire device. In this embodiment, the frame 1 is welded from industrial-grade Q235 square steel pipe and undergoes annealing treatment to eliminate welding stress, ensuring its long-term structural stability and dimensional accuracy. The frame 1 mainly includes a horizontally placed base 11, four support columns 12 extending vertically upward from the four corners of the base 11, and a top beam 13 connecting the tops of each support column 12. This frame structure has high rigidity and good openness, facilitating the installation, commissioning, and maintenance of various functional modules.

[0030] At the very upstream end of the film conveying path in this device, an unwinding module 2 is installed on frame 1. (Refer to...) Figure 1 The unwinding module 2 is used to carry the film roll 22 to be processed. Specifically, the unwinding module 2 includes a horizontally arranged unwinding shaft 21. The unwinding shaft 21 is a precision-machined and chrome-plated 45# steel round bar with sufficient strength and rigidity to support the heavy film roll 22 without significant bending. The two ends of the unwinding shaft 21 are rotatably mounted on bearing seats on the upper part of two opposing support columns 12 by seated deep groove ball bearings, ensuring that it can rotate freely with minimal frictional resistance. In use, the operator fits the center hole of the film roll 22 onto the unwinding shaft 21 and secures it with a retaining ring or tapered sleeve at the shaft end to prevent axial movement of the film roll during unwinding.

[0031] Following the unwinding module 2 on the membrane conveying path is the feeding module 3, whose function is to precisely pull the membrane from the membrane roll 22 and convey it forward for a preset length. (Refer to...) Figure 1 and Figure 2The core components of the feed module 3 are a pair of rollers arranged opposite each other, namely the active feed roller 32 and the driven feed roller 33. The active feed roller 32 is located below, and its roller body is made of a steel core covered with a layer of high wear-resistant, high-friction coefficient polyurethane material to increase the friction with the diaphragm and ensure that the diaphragm does not slip during the conveying process. The two ends of the shaft of the active feed roller 32 are mounted on a bracket fixed to the support column 12 by bearings. One end is directly connected to the output shaft of the feed servo motor 31 by a coupling. The feed servo motor 31 (for example, an AC servo motor with a high-resolution encoder) is fixedly mounted on the crossbeam of the frame 1. By precisely controlling the angle of this motor through a servo driver, the number of rotations of the active feed roller 32 can be precisely controlled, which in turn translates into precise control of the diaphragm conveying length. The driven feed roller 33 is located directly above the active feed roller 32. Its structure is similar to that of the active feed roller 32, but its two ends are mounted on sliding bearing seats that can move within a small range in the vertical direction. Above each sliding bearing housing, a compression spring 34 is provided. The compression spring 34 is a high-strength helical compression spring, with its lower end abutting against the bearing housing of the driven feed roller 33 and its upper end abutting against the crossbeam of the frame 1. The compression spring 34 provides a continuous and stable downward pressure, allowing the driven feed roller 33 to press tightly against the diaphragm and firmly clamp the diaphragm between the driving feed roller 32 and the driven feed roller 33, forming a reliable feed friction force.

[0032] Downstream of the feed module 3, a cutting module 4 is installed to perform the cutting action. The cutting module 4 uses a purely mechanical transmission method to ensure the stability and reliability of the action. The power source for the cutting module 4 is a cutting motor 41, which can be a three-phase asynchronous motor with a reducer, fixedly mounted on one side of the base 11. A crank 42 is fixedly mounted on the output shaft of the cutting motor 41 via a key connection. The other end of the crank 42 is rotatably connected to one end of a connecting rod 43 via a pin and needle roller bearing. The other end of the connecting rod 43 is also rotatably connected to the middle of a slider 44 via a pin and needle roller bearing. The slider 44 is a rigid component, either integrally cast or machined from thick steel plate, with T-slots or threaded holes machined on its lower surface for mounting the cutting blade 45. The cutting blade 45 is made of high-speed tool steel (such as W18Cr4V), precision ground and heat-treated, possessing extremely high hardness and sharpness, and is bolted to the lower surface of the slider 44. To ensure that the slider 44 reciprocates along a strictly vertical path during its movement, linear sliding units (such as ball linear guide sliders) are installed at both ends of the slider 44, and these units slide in cooperation with two vertical guide rails 47 (such as ball linear guides) fixed inside the adjacent support columns 12. These two vertical guide rails 47 are parallel and precisely calibrated, providing precise guidance and support for the movement of the slider 44. Directly below the cutting blade 45, a robust blade holder 46 is fixedly installed on the frame 1. The upper surface of the blade holder 46 is hardened and precision ground to form a flat and hard anvil, and its cutting edge forms a shearing pair with the cutting edge of the cutting blade 45. When the cutting motor 41 rotates, the crank 42 drives the connecting rod 43, which in turn drives the slider 44 to reciprocate up and down along the vertical guide rails 47. The cutting blade 45 then descends and cooperates with the blade holder 46 to cleanly cut the diaphragm by shearing.

[0033] Directly below the cutting module 4, a stacking module 5 is provided for collecting and stacking the cut film sheets. The core component of the stacking module 5 is a vertically movable lifting platform 51. The lifting platform 51 is a flat aluminum alloy plate, slightly larger than the size of the film sheet to be cut. The lifting movement of the lifting platform 51 is achieved by a lifting drive mechanism. This mechanism includes a vertically mounted lead screw 52 (preferably a high-precision ball screw) and a lifting motor 53 (preferably a stepper motor or servo motor) that drives the lead screw to rotate. The lifting motor 53 is connected to the lower end of the lead screw 52 via a coupling, and the motor body is fixed to the base 11. A nut (ball screw nut) that matches the lead screw 52 is fixedly connected to the center of the bottom of the lifting platform 51. When the lifting motor 53 rotates, the lead screw 52 rotates accordingly. Since the nut is fixed to the platform, the platform will smoothly rise or fall along the axis of the lead screw 52. To prevent the lifting platform 51 from rotating with the lead screw during lifting and to further improve its motion stability, the stacking module 5 also includes at least two guide rods 54. These guide rods 54 are smooth, chrome-plated round steel bars, vertically fixed to the base 11, and distributed parallel to the lead screw 52. The lifting platform 51 has through holes corresponding to the guide rods 54, and linear bearings or self-lubricating bushings are press-fitted into the through holes, through which the guide rods 54 pass. In this way, the platform is effectively constrained by the guide rods 54 during lifting and can only perform pure vertical translation. In addition, to ensure that the cut diaphragm falls accurately to the designated position on the lifting platform 51, lateral guide plates 55 are also vertically fixed around the lifting platform 51. These guide plates 55 are made of anti-static plexiglass or stainless steel plates, with their lower ends close to the edge of the platform and their upper ends extending to the bottom of the cutter holder 46, forming a closed "hopper" or "chute" that effectively constrains the lateral drift of the diaphragm during the falling process.

[0034] The overall workflow of this embodiment is as follows: The operator installs the film roll 22 onto the unwinding shaft 21 and manually passes the head of the film sheet between the active feed roller 32 and the driven feed roller 33, placing it below the cutting blade 45. On the human-machine interface (HMI) connected to the equipment, process parameters such as the single-cut length and the number of sheets per stack are set. After starting the equipment, the central controller (such as a PLC) first controls the lifting motor 53 to move the lifting platform 51 to its initial highest position, with its upper surface only slightly lower than the lower surface of the blade holder 46, to reduce the falling distance of the first film sheet. The controller sends a command to the driver of the feed servo motor 31, which precisely rotates at a preset angle, conveying the film sheet forward by a set length through the clamping and conveying action of the active feed roller 32 and the driven feed roller 33. After feeding is complete, the controller starts the cutting motor 41 to rotate one revolution. The crank-connecting rod mechanism drives the slider 44 and the cutting blade 45 to quickly complete one cycle of descent and elevation, precisely cutting the film sheet. The cut membrane sheets fall under gravity along the channel formed by the lateral guide plates 55 and are stacked flat on the lifting platform 51. After each cut, the controller instructs the lifting motor 53 to rotate a small angle according to the preset membrane thickness, causing the lifting platform 51 to descend a distance equal to the membrane thickness. This ensures that the top surface of the newly stacked membrane sheets always remains at almost the same height, guaranteeing the consistency of the subsequent membrane sheet descent. The above-mentioned feeding, cutting, and stacking descent processes are performed automatically and continuously in a loop. When the number of stacked membrane sheets reaches the preset value, the equipment will automatically pause and issue an audible and visual prompt, waiting for the operator to remove the entire stack of membrane sheets before continuing to the next cycle.

[0035] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fully automatic reverse osmosis membrane element cutting and stacking device, comprising a frame (1), characterized in that, Also includes: The feeding module (3) is mounted on the frame (1) and is used to transport the film along a predetermined path. The feeding module (3) includes an active feeding roller (32) and a driven feeding roller (33). The active feeding roller (32) and the driven feeding roller (33) are arranged opposite each other to clamp and transport the film. The feeding module (3) also includes a feeding servo motor (31) for driving the active feeding roller (32) to rotate. A cutting module (4) is mounted on the frame (1) and located downstream of the feed module (3) along the film conveying path; the cutting module (4) includes a slider (44) that reciprocates in a vertical direction, a cutting blade (45) fixed on the slider (44), and a blade holder (46) fixedly mounted on the frame (1) and located below the cutting blade (45), the cutting blade (45) cooperating with the blade holder (46) to cut the film; The stacking module (5) is installed on the frame (1) and located directly below the cutting module (4) for receiving and stacking the film cut by the cutting module (4); the stacking module (5) includes a lifting platform (51) and a lifting drive mechanism for driving the lifting platform (51) to move in the vertical direction.

2. The apparatus according to claim 1, characterized in that, The feed module (3) also includes a pressure spring (34), which is disposed above the driven feed roller (33) and is used to apply pressure to the driven feed roller (33) so that the driven feed roller (33) fits tightly against the active feed roller (32).

3. The apparatus according to claim 1, characterized in that, The cutting module (4) further includes a crank-connecting rod mechanism for driving the slider (44) to reciprocate; the crank-connecting rod mechanism includes a cutting motor (41), a crank (42) connected to the output shaft of the cutting motor (41), and a connecting rod (43) whose two ends are respectively rotatably connected to the crank (42) and the slider (44).

4. The apparatus according to claim 3, characterized in that, The cutting module (4) also includes a vertical guide rail (47), which is fixedly installed on the frame (1), and the two ends of the slider (44) are slidably connected to the vertical guide rail (47).

5. The apparatus according to claim 1, characterized in that, The lifting drive mechanism includes a vertically arranged lead screw (52) and a lifting motor (53) that drives the lead screw (52) to rotate; the bottom of the lifting platform (51) is connected to the upper end of the lead screw (52) for transmission. When the lifting motor (53) drives the lead screw (52) to rotate, it drives the lifting platform (51) to rise and fall along the axis of the lead screw (52).

6. The apparatus according to claim 5, characterized in that, The stacking module (5) also includes a guide rod (54), which is vertically arranged and parallel to the lead screw (52). The guide rod (54) passes through the lifting platform (51) and slides with it, and is used to guide the lifting movement of the lifting platform (51) and prevent it from rotating.

7. The apparatus according to claim 1, characterized in that, The stacking module (5) also includes a side guide plate (55), which is vertically arranged around the lifting platform (51) and extends upward to below the knife holder (46) to constrain the position of the falling film. It also includes an unwinding module (2), which is installed on the frame (1) and located upstream of the feed module (3) along the film conveying path. The unwinding module (2) is used to carry and unwind the film roll (22).

8. The apparatus according to claim 7, characterized in that, The unwinding module (2) includes an unwinding shaft (21), the two ends of which are rotatably mounted on the frame (1) via bearings, and the film roll (22) is sleeved on the unwinding shaft (21).

9. The apparatus according to claim 1, characterized in that, The frame (1) includes a base (11), a support column (12) extending vertically upward from the base (11), and a top beam (13) connecting the top of the support column (12); the feed module (3) and the cutting module (4) are both installed between the support column (12).

10. A method of using a fully automatic reverse osmosis membrane element cutting and stacking device, comprising the fully automatic reverse osmosis membrane element cutting and stacking device according to claims 1-9, characterized in that: The film roll (22) to be cut is placed on the unwinding shaft (21) of the unwinding module (2). The two ends of the unwinding shaft (21) are rotatably mounted on the base (11) of the frame (1) through bearings to ensure that the film roll is installed firmly. Check the installation position and connection of each module to ensure that the feeding module (3), cutting module (4), stacking module (5) and unwinding module (2) are all correctly installed in the corresponding positions of the frame (1). The power components such as the feeding servo motor (31), cutting motor (41), and lifting motor (53) are debugged to ensure that they can operate normally. The unwinding module (2) carries the film roll (22). As the device is started, the film roll begins to unwind under its own tension or slight external traction. The film is gradually released from the film roll. The feed servo motor (31) of the feed module (3) is started, driving the active feed roller (32) to rotate. Under the action of the clamping spring (34), the driven feed roller (33) is tightly attached to the active feed roller (32). The film is clamped between the active feed roller (32) and the driven feed roller (33) and is conveyed downstream along a predetermined path. When the diaphragm is conveyed to the cutting module (4), the cutting module (4) starts working. The cutting motor (41) starts, driving the crank (42) connected to its output shaft to rotate. During the rotation of the crank (42), the slider (44) is driven to reciprocate on the vertical guide rail (47) through the connecting rod (43). The vertical guide rail (47) is fixedly installed on the frame (1) to provide stable guidance for the movement of the slider (44). When the slider (44) moves downward, the cutting blade (45) fixed on the slider (44) moves downward accordingly, cooperating with the blade holder (46) fixedly installed on the frame (1) and located below the cutting blade (45) to cut the diaphragm into the required size. After the cutting is completed, the slider (44) moves upward under the action of the crank-connecting rod mechanism, returning to the initial position, waiting for the next cutting. The cut film falls under gravity. The lifting platform (51) of the stacking module (5) is located directly below the cutting module (4) to receive the cut film. As the film is stacked, the lifting drive mechanism starts to work. The lifting motor (53) drives the vertically set lead screw (52) to rotate. Since the bottom of the lifting platform (51) is connected to the upper end of the lead screw (52), the rotation of the lead screw (52) causes the lifting platform (51) to descend along the axis of the lead screw (52). Meanwhile, the guide rod (54) is set vertically and parallel to the lead screw (52), passes through the lifting platform (51) and slides with it, guides the lifting movement of the lifting platform (51) and prevents it from rotating, ensuring that the diaphragm is stacked neatly. The side guide plate (55) of the stacking module (5) is set vertically around the lifting platform (51) and extends upward to the bottom of the knife holder (46), constraining the position of the falling diaphragm, ensuring that the diaphragm falls accurately on the lifting platform (51), and further improving the stacking accuracy.

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