A beam and plate automatic feeding circulation device and control method

Abstract

The present invention relates to the technical field of wind turbine blade processing, specifically to an automatic feeding circulation device for beam plates and a control method. The device comprises: a feeding device for feeding or stopping feeding into a hopper according to a control signal; a float device connected to an inductive switch for detecting the liquid level and transmitting the liquid level information to a control unit; and a control unit with preset feeding durations and feeding intervals, for receiving the liquid level information transmitted by the inductive switch and outputting a control signal to control the feeding device to operate or stop according to the liquid level and time information. The present invention utilizes a design combining a float device with a proximity inductive switch. Through the precise coordination of a time relay and the inductive switch, this ensures high-precision liquid level control and prevents overfeeding or underfeeding during automatic feeding of resin glue.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine blade processing, and in particular to an automatic feeding circulation device for a beam plate and a control method thereof. Background Art

[0002] Wind turbine beam pultrusion panels currently utilize a traditional impregnation and pultrusion process. A dip tank is installed on the production line, where the glass fiber adheres to the resin adhesive as it passes through the tank. Currently, production sites utilize a semi-automatic feeding method, and the uncontrollable amount of resin adhesive leads to inconsistent product quality. Excessive resin in the tank increases the risk of moisture absorption by the curing agent, which increases viscosity and affects resin curing. This can lead to quality issues such as uneven yarn impregnation, release cloth resistance, foreign matter, and significant linearity fluctuations in the pultruded panels. Excessive resin in the tank impregnation can affect uniform yarn impregnation, resulting in white yarn on the pultruded panels.

[0003] As a core component of wind turbine blades, the mainframe plate is the blade's critical load-bearing structure, making its quality consistency during production crucial. A stable feeding system can reduce process stability fluctuations caused by variability in manual operation and significantly improve the quality consistency of the mainframe plate. Currently, production sites primarily use semi-automatic feeding, but this method is inefficient and relies on manual feeding experience, which can lead to issues with the correct amount of material added, impacting product quality.

[0004] Publication number: CN218517061U This automatic glue dipping device is used in the pultrusion process of black fiber composite materials. When the liquid level in the glue dipping tank drops to the point where the glue needs to be replaced, the liquid level sensor sends a signal to the PLC controller. The PLC controller first controls the recovery valve and recovery pump to open, and pumps the remaining glue in the glue dipping tank into the recovery tank. When the liquid level in the glue dipping tank reaches the bottom, the PLC controller controls the recovery valve and recovery pump to close, and then opens the feed valve on the feed pipe to start feeding new glue from the glue storage tank to the glue dipping tank. After the liquid level reaches the set value, the PLC controller controls the feed valve to close and stop feeding glue, thereby completing the automatic recovery and replacement of the glue. The recovered glue can be used elsewhere, avoiding waste and saving costs. However, relying on feedback from the liquid level sensor may cause the sensor to misjudge the actual liquid level due to stirring and foaming, resulting in unstable feeding, or excessive or insufficient feeding.

[0005] Therefore, there is an urgent need for a new large beam plate automatic feeding circulation device and method to solve the problem of unstable feeding in the prior art. Summary of the Invention

[0006] In view of this, the present invention aims to propose an automatic feeding circulation device and control method for a beam plate to solve the problem of unstable feeding in the prior art.

[0007] Existing technical solutions and their shortcomings: The semi-automatic feeding device is at the bottom of the barrel, and each discharge port corresponds to a dipping tank device. The operator presses the discharge button of the corresponding dipping tank on the control panel. After the button signal is transmitted, it first detects the status of the pipeline pressure sensor. If the system is normal, it outputs two instructions at the same time, one to start the conveying motor, and the other to open the discharge valve of the corresponding dipping tank. The motor drives the material to be transported through the pipeline and flows into the target dipping tank through the open valve. A flow meter is installed in the pipeline to provide feedback when the set amount is reached, closing the valve and motor; the emergency stop button can be pressed at any link to cut off the power supply. If the motor is overloaded or the valve fails, an alarm will be issued and the action will stop. There are two problems: First, semi-automatic feeding still requires operators to start, monitor or adjust regularly, which cannot achieve full process automation and increases labor costs; and improper parameter equipment and inaccurate feeding timing may lead to inaccurate ingredients and equipment failure; human factors lead to operational differences between different batches, increasing the difficulty of quality control. Second, when adjusting feeding parameters or processes in semi-automatic feeding, manual reconfiguration is required, which is time-consuming and error-prone. It is not adaptable to sticky and caking materials and requires additional processing.

[0008] The feeding scheme of this application is an automatic glue circulation system that replaces the existing semi-automatic feeding method. The system uses a 24V power supply, a proximity sensor switch, a set of float devices, an adjustable time relay, and two intermediate relays. When the time relay starts working, the manual feeding button of the original feeding system is connected, and the feeding system injects glue into the hopper. The duration of the glue injection is controlled by the adjustable time relay. When the set maximum liquid level is reached, the float device rises to the limit point, the proximity sensor switch is activated, the power supply of the time relay is cut off, and the manual feeding button of the original feeding system is disconnected to stop feeding, completing a feeding cycle, at which time the next feeding cycle waiting period begins.

[0009] Automated liquid control ensures continuous and stable feeding. The hopper holds only approximately 3-5L of resin, resulting in low storage volume, rapid liquid circulation, and relatively low viscosity. This maintains continuous flow and thorough mixing of the resin system, resulting in effective yarn impregnation. This effectively reduces the effects of moisture and foreign matter on the liquid, significantly improving serious quality issues such as poor release cloth adhesion, linearity fluctuations and deviations, and foreign matter inclusions. Furthermore, the low hopper storage volume significantly reduces the release of small organic molecules from the liquid into the environment, improving control over feeding, storage, and liquid return, significantly reducing liquid dripping, and significantly restoring the air quality in the impregnation room. This ensures continuous and stable production of pultruded board, improving product quality.

[0010] The automated feeding system enables multiple, small-volume feeding, reducing manual intervention and ensuring product straightness. Operators can simultaneously perform other related tasks while feeding, reducing skill requirements and easing employee onboarding. The project is expected to significantly reduce the number of steps involved in feeding and pre-form self-inspection, reducing workload in the dipping room. On average, it is estimated that 10 units of equipment will save one person. Based on an annual labor cost of approximately 80,000 RMB per person, this translates to a labor saving of 480,000 RMB, assuming full production of 60 production lines throughout the year. It also significantly reduces material waste caused by downtime, with material consumption during initial drawing and downtime expected to be reduced to 60% of current production line levels. This means that each initial drawing and downtime period can save 5 kg of raw material, or 20 RMB per kg, resulting in a material cost savings of 100 RMB per event. Based on monthly statistics for each production line, this translates to an annual saving of 72,000 RMB in rubber costs. This translates to a total annual saving of 552,000 RMB in labor and material costs.

[0011] The technical solution of the present invention is achieved as follows:

[0012] One object of the present invention is to disclose an automatic feeding circulation device for beam and plate, comprising:

[0013] A feeding device, used to feed or stop feeding into the hopper according to a control signal;

[0014] A float device connected to an induction switch for detecting the liquid level and transmitting the liquid level information to a control unit;

[0015] The control unit has a preset feeding time and feeding interval time, and is used to receive the liquid level information transmitted by the induction switch, and output a control signal to control the operation or stop of the unloading device according to the liquid level information and time information.

[0016] Furthermore, the material discharge device includes a material storage tank, a material suction pipeline, a material delivery pump, and a material delivery pipeline connected in sequence;

[0017] The material storage tank is used to store rubber material;

[0018] The material suction pipeline connects the material storage tank and the material delivery pump, serving as a channel for material delivery;

[0019] The feed pump, as a power source, is used to extract the material from the storage tank and deliver it under pressure;

[0020] The material delivery pipeline is used to deliver the material output by the material delivery pump to a target location.

[0021] Furthermore, one end of the feed pipeline away from the feed pump is connected to the inner cavity of the hopper, and the feed pipeline is provided with a valve for adjusting the flow rate and controlling the on-off.

[0022] Furthermore, the hopper is a hemispherical shell with an upper opening, a discharge pipe is provided at the bottom, and a flow control valve is provided on the discharge pipe.

[0023] Furthermore, the capacity of the rubber material in the hopper is 3-5L.

[0024] Furthermore, the float device includes a float, a sliding sleeve, an induction ring, and a guide rod connected in sequence from bottom to top;

[0025] The float floats on the liquid surface and moves up and down with the liquid level;

[0026] The sliding sleeve connects the float and the induction ring, allows the float to move freely along the guide rod, and provides a certain friction force to stabilize the position of the float;

[0027] The induction ring contains or is attached with an induction element, which triggers a signal when it moves to a specific position with the float;

[0028] The guide rod is fixedly installed vertically to provide guide support for the entire float assembly, ensuring that the float and the induction ring can move up and down smoothly.

[0029] Furthermore, the inductive switch is an inductive or capacitive proximity switch.

[0030] Furthermore, the control unit is provided with an adjustable time relay, which can automatically start and stop the unloading device according to preset time intervals.

[0031] Another object of the present invention is to disclose a control method for a beam and plate automatic feeding circulation device, based on any of the above-mentioned beam and plate automatic feeding circulation devices, specifically comprising the following steps:

[0032] S1: Pre-set the feeding time, feeding interval and liquid level value;

[0033] S2: The float device detects the liquid level in the hopper, and the induction switch transmits the liquid level information to the control unit;

[0034] S3: After the control unit receives the liquid level information, if the liquid level is lower than the set value, it executes step S4; if the liquid level is higher than the set value, it executes step S5;

[0035] S4: The feeding device starts to inject glue into the hopper. When the injection time is equal to the set feeding time, step S5 is executed. When the injection time is less than the set feeding time, step S2 is executed.

[0036] S5: stop adding material;

[0037] S6: After the set feeding interval is over, execute S2.

[0038] Furthermore, in step S1, the feeding time and the feeding interval are pre-set; wherein, the feeding time is set comprehensively based on the feeding capacity per unit time of the unloading device and the capacity of the hopper, and the feeding interval is determined based on the minimum consumption cycle of the glue during the actual processing; at the same time, the maximum liquid level threshold and the minimum liquid level threshold in the hopper are set to control the start and stop of the feeding.

[0039] Compared with the prior art, the automatic feeding circulation device and control method of the beam plate of the present invention has the following advantages:

[0040] 1. The present invention adopts a design that combines a float device with a proximity sensor switch to ensure high-precision liquid level control and no over- or under-feeding during automatic resin glue feeding. Through the precise coordination of the time relay and the sensor switch, the entire feeding process is made more intelligent and accurate, significantly reducing the problem of product quality fluctuations caused by inadequate manual monitoring, and improving the consistency and stability of quality between different batches of products.

[0041] 2. The present invention is equipped with a recovery system consisting of a specially designed inclined collection trough and a pneumatic diaphragm pump. These components can effectively collect the remaining wet material and pump it back into the hopper, ensuring the efficient recycling of the material, simplifying the operation process, greatly improving the material utilization rate, reducing the cost increase caused by material waste, and improving the overall production efficiency and environmental protection performance.

[0042] 3. The present invention provides an automatic cyclic feeding method of "small amounts and multiple times", which first accurately replenishes the current required amount, and then carries out the next round of feeding after the set interval time. This avoids the volatilization and oxidation problems of the glue that may be caused by traditional one-time large-scale feeding, can effectively reduce the impact of viscosity changes, further enhance the quality stability of the final product, and provide reliable protection for the subsequent pultrusion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0044] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention.

[0045] Reference numerals:

[0046] 1. Unloading device; 101. Material storage tank; 102. Suction pipe; 103. Feed pump; 104. Feed pipe; 2. Hopper; 201. Discharge pipe; 202. Flow control valve; 3. Float device; 301. Float; 302. Sleeve; 303. Induction ring; 304. Guide rod; 4. Induction switch; 5. Control unit; 6. Adjustable time relay. DETAILED DESCRIPTION

[0047] In order to make the technical means, objectives and effects of the present invention easier to understand, embodiments of the present invention are described in detail below with reference to specific figures.

[0048] It should be noted that all directional and positional terms in the present invention, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inside," "outside," "top," "low," "lateral," "longitudinal," and "center," are used only to explain the relative positional relationships and connections between components in a specific state. They are intended solely to facilitate the description of the present invention and do not require that the present invention be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, terms such as "first" and "second" in the present invention are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated.

[0049] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical connections; direct connections or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0050] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0051] Compared to existing automatic feeding devices using liquid level sensors, these sensors can misjudge the actual liquid level due to agitation and foaming, leading to unstable feeding. Time control, by maintaining a constant feeding rate, prevents liquid level fluctuations from interfering with the material ratio. This is particularly suitable for pultruded glass sheets, where increased extrusion time increases the viscosity of the resin curing agent and promotes foaming. Furthermore, simple liquid level control can result in response delays, leading to over- or under-feeding. However, combined with time control, precise flow metering ensures consistent feeding amounts each time, reducing batch variability and facilitating control of pultruded glass sheet straightness.

[0052] Furthermore, pultruded glass sheets require high material uniformity. The molding of pultruded composite materials requires precise control of the resin injection rate to avoid porosity. Time-controlled continuous feeding maintains a stable raw material input rate, avoids ratio deviations caused by liquid level fluctuations, and improves the consistency of pultruded glass sheet quality. Sudden changes in liquid level can introduce the risk of bubbles or delamination. Continuous feeding reduces internal defects by smoothly replenishing the material, which is especially critical for beam panels. The pultruded sheet extrusion process operates in a high-temperature or dusty environment, where liquid level sensors are prone to failure. Compared to automatic liquid level feeding control, time relay control requires timing and flow control and is more reliable. Furthermore, liquid level control requires frequent parameter adjustments to adapt to different liquid levels, while time control requires no intervention after the preset program, making it suitable for continuous production lines. This reduces reliance on liquid level sensors and avoids maintenance downtime due to sensor failure. The stable feeding rate allows for accurate calculation of raw material consumption and avoids overfeeding due to liquid level fluctuations. The multiple control methods adopted in this application have increased the pass rate from 90% to 99% in actual applications, effectively reducing the scrap rate.

[0053] The present invention discloses an automatic feeding circulation device for beams and plates, comprising:

[0054] The feeding device 1 is used to feed or stop feeding the hopper 2 according to the control signal;

[0055] The float device 3 is connected to the induction switch 4 and is used to detect the liquid level and transmit the liquid level information to the control unit 5;

[0056] The control unit 5 has a preset feeding time and feeding interval time, and is used to receive the liquid level information transmitted by the sensor switch 4, and output a control signal to control the operation or stop of the unloading device 1 according to the liquid level information and time information.

[0057] The unloading device 1 starts or stops adding material to the hopper 2 based on the control signal from the control unit 5. It has a fast response speed and can accurately control the adding process. The float device 3 + sensor switch 4 triggers the sensor switch 4 by the position of the float 301 moving with the change of liquid level to detect the height of the rubber material in the hopper 2. It has a simple structure and high reliability. It can provide real-time feedback on the current liquid level status. The control unit 5 receives the liquid level information from the float device 3 and determines whether to start or stop the unloading device 1 in combination with the preset feeding time and feeding interval time. The feeding strategy under different working conditions can be set.

[0058] The control unit 5 activates the feeding device 1 according to a preset cycle. The rubber material gradually enters the hopper 2, and the liquid level rises. When the rubber material approaches the set height, the float device 3 floats up due to buoyancy, driving the connecting rod to move. The connecting rod triggers the sensor switch 4, sending a high material level signal to the control system. After receiving the signal, the control system immediately stops feeding and enters the next feeding cycle after the set feeding interval is over. Alternatively, when the liquid level is lower than the set value, the sensor switch 4 is triggered and transmits a signal to the control unit 5. The control unit 5 determines whether to start the feeding device 1 for refilling based on the preset time parameters. The feeding device 1 performs the feeding operation until it reaches the set liquid level or stops after the time. The whole process is repeated in a cycle to achieve automated feeding control.

[0059] This setting adopts a design that combines a float device 3 with a proximity sensor switch 4, ensuring high-precision liquid level control and no over- or under-feeding during automatic resin glue feeding. Through the precise coordination of the time relay and the sensor switch 4, the entire feeding process is made more intelligent and accurate, significantly reducing the problem of product quality fluctuations caused by inadequate manual monitoring, and improving the consistency and stability of quality between different batches of products.

[0060] Specifically, the material discharge device 1 includes a material storage tank 101, a material suction pipeline 102, a material delivery pump 103, and a material delivery pipeline 104 connected in sequence;

[0061] Material storage tank 101, used for storing rubber material;

[0062] The material suction pipeline 102 connects the material storage tank 101 and the material delivery pump 103 and serves as a channel for material delivery;

[0063] The feed pump 103 serves as a power source for extracting the material from the storage tank and delivering it under pressure;

[0064] The material delivery pipeline 104 is used to deliver the material output by the material delivery pump 103 to a target location.

[0065] The material storage tank 101 provides a stable and continuous supply of material, ensuring uninterrupted material flow during system operation. The suction line 102 guides the material from the storage tank to the inlet of the feed pump 103, ensuring smooth material intake. As the core power component, the feed pump 103 provides a pressure differential for controlled material delivery. Different pump types, such as screw pumps and gear pumps, can be selected based on the material's characteristics. The feed pipeline 104 efficiently and safely transports the pumped material to the designated location and is typically equipped with valves to control flow and on / off control.

[0066] This setting, through reasonable pipeline layout and power configuration, can accurately and stably complete the task of conveying rubber or other viscous materials according to the signals sent by the control system. It is the core part of the execution action in the entire feeding circulation system.

[0067] Specifically, one end of the feeding pipeline 104 away from the feeding pump 103 is connected to the inner cavity of the hopper 2. The feeding pipeline 104 can be provided with a valve to adjust the flow rate and control the on-off.

[0068] Feed line 104 connects to hopper 2, ensuring direct and efficient delivery of the rubber material to hopper 2, preventing external contamination and material loss while facilitating continuous or periodic refilling. A valve is installed on this section of feed line 104 to control the flow of material, enabling on / off functionality and adjusting the material flow rate. For example, a regulating valve can be used for refined refilling, and a control system can be used for timed and quantitative refilling. Multiple operating modes are supported, including continuous feeding, intermittent feeding, and manual commissioning, to accommodate diverse process requirements. When equipment is undergoing maintenance or a malfunction occurs, the valve can be closed to quickly shut off the material delivery path, ensuring the safety of both personnel and equipment.

[0069] This setting enhances the controllability and safety of the entire beam and slab automatic feeding circulation device, and improves its intelligence level and engineering adaptability.

[0070] Specifically, the hopper 2 may be a hemispherical shell with an upper opening, a discharge pipe 201 is provided at the bottom, and a flow control valve 202 is provided on the discharge pipe 201 .

[0071] The hemispherical hopper 2 shell takes advantage of its geometric shape to make it easier for materials to be concentrated at the bottom outlet under the action of gravity, resulting in better material fluidity, reduced residue, and improved emptying efficiency. The bottom discharge pipe 201 minimizes the discharge path, ensuring smooth material flow and avoiding blockage or accumulation. The flow control valve 202 controls the discharge rate to meet different process requirements. It can be connected to the control system to achieve on-demand discharge and support multiple working modes, such as continuous, pulse, and timing.

[0072] The hopper 2 has good mechanical properties, can withstand certain pressure and impact, is suitable for a variety of industrial environments, has strong anti-blocking ability, and has smooth discharge and low resistance, making the entire feeding circulation system respond faster and improving production rhythm.

[0073] Preferably, the capacity of the rubber material in the hopper 2 is 3-5L.

[0074] Rubber materials, such as structural adhesives and sealants, typically have a specific pot life. Controlling the capacity to 3-5L helps ensure they are used within that effective time, reducing the risk of performance degradation due to prolonged storage. A small capacity means lower power requirements for the feed pump 103, shortened refill times, and lower overall energy consumption. This also reduces material waste, improves utilization, and makes it easier to coordinate with valves and sensors to achieve functions such as rapid start and stop, precise metering, and closed-loop feedback, thereby enhancing system intelligence. The moderate capacity also facilitates both manual and automatic cleaning, making it suitable for systems with high-viscosity materials that require regular maintenance. This avoids the safety hazards associated with large amounts of rubber accumulated, especially in high-temperature or confined environments. The small capacity design reduces the risk of accidental leaks or reactions.

[0075] Specifically, the float device 3 includes a float 301, a sleeve 302, an induction ring 303, and a guide rod 304 connected in sequence from bottom to top;

[0076] The float 301 floats on the liquid surface and moves up and down with the liquid level;

[0077] The sliding sleeve 302 connects the float 301 and the induction ring 303, allowing the float 301 to move freely along the guide rod 304 and providing a certain friction force to stabilize the position of the float 301;

[0078] The induction ring 303 contains or is attached with a sensing element, such as a magnetic switch, a photoelectric sensor, etc., which triggers a signal when it moves to a specific position with the float 301;

[0079] The guide rod 304 is fixedly installed vertically to provide guide support for the entire float 301 assembly, ensuring that the float 301 and the induction ring 303 can move up and down smoothly.

[0080] It directly senses changes in liquid level, floats up and down with the liquid surface through the principle of buoyancy, adapts to liquids of different densities, and has good corrosion resistance and aging resistance. The sleeve 302 serves as a connector to transmit the movement of the float 301 to the induction ring 303, while ensuring that the float 301 can slide smoothly along the guide rod 304. Appropriate friction is used to prevent the float 301 from making unnecessary movements due to fluid fluctuations. The induction ring 303 contains or integrates a sensing element for detecting the position of the float 301 and converting it into an electrical signal to feed back to the control unit 5. It has high sensitivity and fast response. Multiple sensing points can be set as needed to achieve more precise liquid level monitoring. The guide rod 304 provides stable support and guidance for the float 301 and the induction ring 303, ensuring that they can move along the predetermined path.

[0081] This setting accurately reflects the liquid level height, and the induction ring 303 accurately captures the position information, ensuring that the control system obtains reliable data.

[0082] Preferably, the float device 3 can be a float 301 connecting rod mechanism.

[0083] The buoyancy of the float 301 reflects the material height, driving the connecting rod to mechanically trigger the limit signal. The structure is simple and suitable for high-viscosity resins. The stainless steel material is easy to clean and resistant to harsh environments. It is not affected by dust, humidity, and electromagnetic interference. The installation height of the float 301 can be adjusted to meet different limit requirements.

[0084] Specifically, the inductive switch 4 can be an inductive / capacitive proximity switch, which is an electronic detection. When the connecting rod of the float 301 reaches the set height, the proximity switch is triggered and an electrical signal is sent to the control unit 5. The response speed is millisecond level, suitable for high-precision control, non-contact detection, and reduced mechanical wear.

[0085] Specifically, the control unit 5 is provided with an adjustable time relay 6, which can automatically start and stop the unloading device 1 according to preset time intervals, such as solenoid valves, motors, conveyor belts, etc. The unloading cycle can be set, such as starting once every 300 seconds and the duration of a single unloading, such as running for 20 seconds each time. The control accuracy in seconds is higher, and manual / automatic switching is supported, which is convenient for debugging and maintenance. The selected model has memory function and pause function, which is convenient for flexible adjustment.

[0086] Specifically, the device also includes a 24V power supply and two intermediate relays.

[0087] The 24V power supply provides a stable 24V DC power supply for the entire automatic feeding circulation system, ensuring the normal operation of various components, such as the induction switch 4, time relay, intermediate relay, etc. Compared with the high-voltage power supply, the 24V power supply has higher safety, reduces the risk of electrical failure, and helps to reduce long-term operating costs.

[0088] Intermediate relays can isolate and amplify signals between the control system and the actuator. For example, they can convert weak control signals, such as those from a time relay or inductive switch, into strong signals capable of driving larger loads, such as motors or valves. By isolating the control circuit from the actuator circuit, faults in the actuator circuit, such as short circuits or overloads, can prevent damage to the control system.

[0089] This setting increases the redundancy of the system. Even if a part fails, other parts can still work normally, which improves the reliability of the overall system. Intermediate relays of different specifications can be selected according to different application scenarios to adapt to different load requirements and facilitate expansion and upgrading.

[0090] Specifically, the device also includes an electric or pneumatic valve for controlling the flow of liquid or powder, such as a solenoid valve, a ball valve, etc.

[0091] Electric ball valves / butterfly valves are suitable for large-caliber, high-precision flow control. Pneumatic valves are commonly used in flammable, explosive, or clean environments, offering fast response and high safety. They are typically installed on the feed line 104, between the outlet of the feed pump 103 and the hopper 2, to control whether material flows into the hopper 2 or processing equipment. Solenoid valves are suitable for low-flow, fast-start and -stop liquid control. They can be used in conjunction with control systems to achieve functions such as quantitative feeding and pulse feeding, meeting high-precision process requirements. They make the feeding process more flexible and controllable, shorten refill time, and quickly shut off material flow in the event of a fault or emergency to prevent leakage, spillage, or contamination.

[0092] Specifically, the control unit 5 includes an embedded controller, which is suitable for small systems and has a low device cost.

[0093] An embedded controller refers to a control module that integrates a microprocessor, input / output interfaces, and memory. Common types include single-chip microcomputers such as STM32, AVR, and PIC, industrial PLCs such as small integrated PLCs, and embedded industrial control motherboards such as those based on the ARM architecture. This controller receives input signals from the float 301 liquid level sensor, sensor switch 4, flow meter, and other sensors. It determines whether to activate the unloading device 1 based on preset liquid level thresholds and time parameters, controls the start and stop of the feed pump 103, opens and closes valves, and generates alarms. It also supports the configuration of process parameters such as feeding duration, feeding interval, and liquid level limits.

[0094] Specifically, the device also includes an emergency stop button for manually forcibly interrupting the feeding process.

[0095] It is installed in a conspicuous position on the equipment operation panel or outside the control box for quick and easy operation. Once triggered, it can cut off the power supply of the main control circuit or control system, achieving immediate shutdown, preventing the equipment from running out of control, protecting the operator and the equipment itself, and responding quickly with almost no delay. It is independent of the program or control system, and the physical circuit breaker is more stable.

[0096] Specifically, the device also includes an inclined collecting tank for collecting the residual infiltrated material. A pipeline is installed below the collecting tank to connect to a pneumatic diaphragm pump. The pneumatic diaphragm pump increases the pressure to pump the material into the hopper 2 to form a cycle.

[0097] An inclined collection trough, installed in the feeding area or beneath the workpiece, collects dripping, residual, or overflowing rubber. Its tilted design allows the liquid to flow naturally to the bottom outlet, collecting unused impregnated rubber or other process residues. A pneumatic diaphragm pump, driven by compressed air and featuring strong self-priming, corrosion resistance, and explosion-proof properties, is installed beneath the collection trough to transport the collected residue back to hopper 2. Connecting pipes connect the collection trough to the pneumatic diaphragm pump, and then to hopper 2, completing a complete recycling path for the residue: collection → transportation → recovery → reuse.

[0098] This setting collects unused rubber or cleaning fluid to avoid waste, improve material utilization efficiency, prevent rubber dripping from contaminating the ground or equipment, keep the working area clean and tidy, and has a simple and reliable structure.

[0099] Another object of the present invention is to disclose a control method for a beam and plate automatic feeding circulation device, based on any of the above-mentioned beam and plate automatic feeding circulation devices, specifically comprising the following steps:

[0100] S1: Pre-set the feeding time, feeding interval and liquid level value;

[0101] Set system parameters, determine the feeding time and feeding interval, liquid level value, realize timing and quantitative control, and prevent overflow.

[0102] S2: The float device 3 detects the liquid level in the hopper 2, and the induction switch 4 transmits the liquid level information to the control unit 5;

[0103] Real-time liquid level monitoring is achieved as an important basis for starting / stopping feeding.

[0104] S3: After the control unit 5 receives the liquid level information, if the liquid level is lower than the set value, it executes step S4; if the liquid level is higher than the set value, it executes step S5;

[0105] Control logic core, determine whether adding material is needed at present.

[0106] S4: The feeding device 1 starts to inject the glue into the hopper 2. When the injection time is equal to the set feeding time, step S5 is executed. When the injection time is less than the set feeding time, step S2 is executed.

[0107] Start the feeding device 1, perform the feeding operation, and prevent excessive feeding through time limit.

[0108] S5: stop adding material;

[0109] Stop the addition process to protect the equipment and prevent spills.

[0110] S6: After the set feeding interval ends, execute S2;

[0111] Wait for the set time and then re-check the liquid level to form a periodic control cycle to avoid frequent starts and stops.

[0112] The float device 3 triggers the induction switch 4, automatically cutting off the feeding process. A time relay precisely controls the duration of each feeding cycle, allowing for flexible adaptation to varying feeding speed requirements. The system employs a "small amount, multiple times" automatic circulation design to reduce glue volatilization and oxidation, improving product quality.

[0113] This setting reduces human intervention, improves the degree of automation, realizes closed-loop regulation, avoids excessive or insufficient feeding, and the residual material is returned to hopper 2 through the collection tank and the pneumatic diaphragm pump to form a circulation, which solves the problem of unstable quality caused by human factors in the semi-automatic feeding process, improves the feeding accuracy and efficiency through automation, and realizes more precise feeding control.

[0114] Specifically, in step S1, the feeding time and the feeding interval are pre-set; wherein, the feeding time is set comprehensively based on the feeding capacity per unit time of the unloading device 1 and the capacity of the hopper 2, and the feeding interval is determined based on the minimum consumption cycle of the glue liquid during the actual processing; at the same time, the maximum liquid level threshold and the minimum liquid level threshold in the hopper 2 are set to control the start and stop of the feeding.

[0115] Due to the uncertainty of liquid consumption, the system sets feeding parameters based on saturated feeding to ensure continuous feeding even under high-load conditions without interruptions. This prevents frequent starts and stops. The float device 3 is set according to the maximum liquid level required by the process, achieving upper and lower level control to ensure safe operation and provide a basis for determining when to start and stop feeding. The feeding duration is determined by the maximum feeding volume per unit time of the feeding device 1 to avoid overflow or system pressure fluctuations caused by excessive single feeding, ensuring controllable feeding.

[0116] The dual control of setting time and liquid level makes the material supply more accurate and stable, and the parameters can be flexibly adjusted according to different process requirements. It can effectively prevent overflow, protect equipment and the environment, avoid the feed pump 103 from idling or clogging for a long time, reduce unnecessary start and stop times, and reduce mechanical impact and energy consumption.

[0117] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A control method for a beam plate automatic feeding circulation device, characterized in that: The specific steps include: S1: Pre-set the feeding time, feeding interval and liquid level value; S2: The float device (3) detects the liquid level in the hopper (2), and the induction switch (4) transmits the liquid level information to the control unit (5); S3: After the control unit (5) receives the liquid level information, if the liquid level is lower than the set value, it executes step S4; if the liquid level is higher than the set value, it executes step S5; S4: the feeding device (1) starts to inject the glue into the hopper (2). When the injection time is equal to the set feeding time, step S5 is executed. When the injection time is less than the set feeding time, step S2 is executed. S5: stop adding material; S6: After the set feeding interval ends, execute S2; The automatic feeding circulation device for beam and plate includes: A feeding device (1) is used to feed or stop feeding into a hopper (2) according to a control signal; The capacity of the rubber material in the hopper (2) is 3-5L; A float device (3), the float device (3) being connected to a sensor switch (4) for detecting a liquid level and transmitting the liquid level information to a control unit (5); A float device (3) connected to an induction switch (4) for detecting a liquid level and transmitting the liquid level information to a control unit (5), wherein the float device (3) comprises a float (301), a sliding sleeve (302), an induction ring (303), and a guide rod (304) connected in sequence from bottom to top; The float (301) floats on the liquid surface and moves up and down with the liquid level; The sliding sleeve (302) connects the float (301) and the induction ring (303), allows the float (301) to move freely along the guide rod (304), and provides friction to stabilize the position of the float (301); The induction ring (303) contains or is attached with an induction element, which triggers a signal when it moves to a specific position along with the float (301); The guide rod (304) is fixedly installed vertically to provide guide support for the entire float (301) assembly, ensuring that the float (301) and the induction ring (303) can move up and down smoothly; The control unit (5) is internally preset with a feeding time and a feeding interval time, and is used to receive the liquid level information transmitted by the induction switch (4), and output a control signal to control the operation or stop of the unloading device (1) according to the liquid level information and time information.

2. The control method of the automatic feeding circulation device for beam slabs according to claim 1 is characterized in that: The material discharge device (1) comprises a material storage tank (101), a material suction pipeline (102), a material delivery pump (103), and a material delivery pipeline (104) connected in sequence; The material storage tank (101) is used to store rubber material; The material suction pipeline (102) connects the material storage tank (101) and the material delivery pump (103) and serves as a channel for material delivery; The feed pump (103) serves as a power source for extracting the material from the storage tank and delivering it under pressure; The material delivery pipeline (104) is used to deliver the material output by the material delivery pump (103) to a target location.

3. The control method of the automatic feeding circulation device of the beam plate according to claim 2 is characterized in that: One end of the material delivery pipeline (104) away from the material delivery pump (103) is connected to the inner cavity of the hopper (2). The material delivery pipeline (104) is provided with a valve for adjusting the flow rate and controlling the on-off.

4. The control method of the beam plate automatic feeding circulation device according to claim 1 is characterized in that: The hopper (2) is a hemispherical shell with an upper opening, a discharge pipe (201) is provided at the bottom, and a flow control valve (202) is provided on the discharge pipe (201).

5. The control method of the automatic feeding circulation device for beam and slab according to claim 1 is characterized in that: The inductive switch (4) is an inductive or capacitive proximity switch.

6. The control method of the beam plate automatic feeding circulation device according to claim 1 is characterized in that: The control unit (5) is provided with an adjustable time relay (6) capable of automatically starting and stopping the unloading device (1) according to preset time intervals.

7. The control method of the beam plate automatic feeding circulation device according to claim 1 is characterized in that: In step S1, the feeding time and the feeding interval are pre-set; wherein, the feeding time is comprehensively set based on the feeding capacity per unit time of the feeding device (1) and the capacity of the hopper (2), and the feeding interval is determined based on the minimum consumption cycle of the glue liquid during the actual processing; at the same time, the maximum liquid level threshold and the minimum liquid level threshold in the hopper (2) are set to control the start and stop of feeding.

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