A bark cleaning device for processing acacia mangium tannin and a cleaning method thereof

Abstract

The application discloses a bark cleaning equipment for processing Acacia mangium tannin and a cleaning method thereof, relates to the technical field of Acacia mangium tannin processing, and comprises a cleaning tank, the bottom of the cleaning tank is provided with supporting legs, a discharging bin is installed at the bottom of the cleaning tank on one side of the supporting legs, a mounting plate and a fixed plate are fixedly connected to the top of the cleaning tank, a servo motor is installed on the mounting plate, the servo motor is in transmission connection with a cleaning equipment, the cleaning equipment is used for cleaning Acacia mangium bark, and the cleaning equipment comprises a swinging mechanism and a cleaning mechanism; the Acacia mangium bark is driven to swing in water by a group of servo motors in transmission of the cleaning basket, the Acacia mangium bark is pushed to turn over in the cleaning basket by a transmission push plate, the cleaning effect is improved, two cleaning modes are driven by the group of servo motors, the use cost is reduced, the servo motor can also drive a cleaning block to clean the bottom of the cleaning tank at the same time, the bottom of the cleaning tank is conveniently cleaned, and the overall coherence of the equipment is improved.

Description

Technical Field

[0001] This invention relates to the field of Acacia mangium tannin processing technology, specifically to a bark cleaning device and method for processing Acacia mangium tannin. Background Technology

[0002] Acacia mangium, a fast-growing and high-yielding economic tree species, has been widely cultivated in South and Southwest my country since its introduction in the 1980s. This species has a short growth cycle, strong environmental adaptability, and its bark contains over 36% condensed tannins, making it a high-quality raw material for preparing natural plant tannins. Tannins refined from Acacia mangium bark using modern processes such as water extraction, vacuum concentration, and spray drying exhibit excellent tanning properties and stable physicochemical indicators. They can effectively replace traditional imported Vitex negundo bark tannins and are widely used in leather tanning, water treatment, wood modification, and mining flotation industries. Market demand continues to grow with the development of downstream industries.

[0003] In the entire tannin processing flow, bark cleaning is the first and core pretreatment step, and its cleaning effect directly determines the purity of the raw materials and the quality of the final product in subsequent extraction processes. Freshly harvested Acacia mangium bark is covered with a large amount of mud, dust, bark debris, and a small amount of humus. If it is not thoroughly cleaned before entering the crushing and extraction stages, solid impurities will enter the subsequent pipelines with the extraction liquid. This will not only wear down the conveying pumps, clog the filter holes and heat exchange equipment, but also reduce the purity and color of the tannin product, increase the processing costs of subsequent refining processes, and even affect the stability of the product's tanning performance. Therefore, efficient, stable, and low-loss bark cleaning equipment is a key basic equipment to ensure tannin processing capacity and product quality.

[0004] Currently, the bark cleaning equipment used in the industry is mainly divided into three categories: drum type, agitator type, and spray type. They generally suffer from single function and limited cleaning effect. Drum type equipment relies on the rotation of the drum to drive the material to tumble, but it has problems such as high bark damage rate, large power loss, and easy residue of small impurities; agitator type equipment is prone to bark entanglement and accumulation, and the inner material cannot fully contact the water flow, resulting in obvious cleaning dead corners; spray type equipment consumes a lot of water and can only wash off the surface dust of the bark, and is not effective in removing mud and sand embedded in the bark texture.

[0005] To improve cleaning effectiveness, some composite cleaning equipment uses multiple drive motors to control oscillation, stirring, and slag removal actions. While this improves cleaning capabilities to some extent, it also brings problems such as high equipment manufacturing costs, complex control systems, numerous potential failure points, and difficult operation and maintenance. Furthermore, most cleaning equipment lacks a self-cleaning function at the bottom of the tank. The settled mud, sand, and debris must be manually removed after the machine is stopped, reducing production continuity and posing safety hazards in confined spaces, making it unsuitable for the large-scale, continuous processing needs of tannin extraction.

[0006] In summary, existing bark cleaning equipment cannot simultaneously balance cleaning efficiency, operating costs, and self-cleaning capabilities, thus hindering the improvement of quality and efficiency in the Acacia mangium tannin processing industry. Developing a bark cleaning device with high structural integration, single-power drive for multi-condition operation, and automatic slag removal function has become an urgent technical problem to be solved in the industry. Summary of the Invention

[0007] The purpose of this invention is to provide a bark cleaning device and method for processing Acacia mangium tannin, in order to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A bark cleaning device for processing Acacia mangium tannin includes a cleaning tank with a support leg at the bottom. A material discharge bin is installed at the bottom of the cleaning tank on one side of the support leg. An mounting plate and a fixing plate are fixedly connected to the top of the cleaning tank. A servo motor is mounted on the mounting plate, and the servo motor is driven by a cleaning device. The cleaning device is used to clean Acacia mangium bark. The cleaning device includes a swing mechanism and a cleaning mechanism. The cleaning mechanism is connected to a cleaning mechanism for removing residue from the bottom of the cleaning tank.

[0010] The swing mechanism is used to repeatedly swing the bark of the Acacia mangium tree in the cleaning tank for cleaning.

[0011] The cleaning mechanism is used to repeatedly push the bark of the Acacia mangium tree to clean it.

[0012] The swing mechanism includes a rotating shaft with one end connected to the output shaft of a servo motor. The free end of the rotating shaft is fixedly connected to a first gear and a second gear. The second gear and the third gear mesh intermittently. The bottom of the third gear is fixed to the top of the cleaning basket and is used to drive the cleaning basket to swing repeatedly inside the cleaning box.

[0013] The cleaning mechanism includes a fourth gear that meshes with a first gear. The fourth gear is mounted on a roller. One end of the roller rotates through the sleeve and the side wall of the cleaning basket and is connected to a push plate for pushing the bark of the Acacia mangium tree to tumble inside the cleaning basket.

[0014] The cleaning mechanism includes a telescopic push rod mounted on the side wall of the cleaning tank. A sliding block is connected to the extended end of the telescopic push rod and is used to move the sliding block. A drive shaft is connected to the end of the sliding block away from the telescopic push rod. Gear five is connected to the top of the drive shaft, and gear five meshes with gear six to drive the drive shaft to rotate. Gear seven is connected to the bottom of the drive shaft, and gear seven meshes with gear eight. Gear eight is mounted on a rotating shaft. A universal joint is connected to one end of the rotating shaft, and a rotating rod is connected to the free end of the universal joint. One end of the rotating rod rotatably passes through the side wall of the cleaning tank and is connected to a lead screw. One end of the lead screw is threaded through the cleaning block and rotatably connected to the inner side wall of the cleaning tank.

[0015] Both gear two and gear three are half gears. The bottom end of gear three is fixed to the center of the top of one side wall of the cleaning basket. The cleaning basket has a concave semi-elliptical cylindrical structure. The height of the cleaning basket is less than the width of the cleaning basket. The lower half of the cleaning basket is a mesh for filtering liquid and impurities.

[0016] The roller is fixed through the gear four. One end of the roller is rotatably connected to the inner wall of the cleaning basket. Two sets of sleeves are symmetrically arranged on the side wall of the cleaning box. The two sets of sleeves are rotatably connected to the mounting plate and the fixing plate, respectively. Multiple sets of push plates are provided. The included angle between two adjacent sets of push plates is less than or equal to 90 degrees. The multiple sets of push plates are distributed on the roller inside the cleaning box.

[0017] The sliding block has an L-shaped structure, and the bottom end of the sliding block is slidably connected to the bracket. One end of the bracket is fixed to the side wall of the cleaning tank. Gears five, six, seven and eight are all bevel gears.

[0018] One end of the rotating shaft is fixed to the bracket, and the other end of the bracket is fixed to the side wall of the cleaning tank. The universal joint is a universal connector, and a sealing ring is provided at the rotatable connection point of the rotating rod to the cleaning tank.

[0019] The lead screw is placed at an angle inside the cleaning tank, and the angle of inclination of the lead screw is the same as the angle of inclination of the bottom of the cleaning tank. The side wall of the cleaning block is slidably connected to the side wall of the cleaning tank, and the bottom of the cleaning brush is connected with bristles.

[0020] A method for cleaning the bark used in the processing of Acacia mangium tannin, using the aforementioned cleaning equipment, comprises the following steps:

[0021] S1. Equipment Inspection and Material Preparation: Before cleaning, verify the equipment status, ensuring the cleaning block is at the initial high position of the bottom of the cleaning tank, the discharge hopper valve is closed, and the clutch gear set is disengaged. Confirm that all transmission parts are well lubricated and that the tank wall seals are undamaged and leak-free. Inject room temperature water into the cleaning tank, controlling the water level to be 10-15cm above the lowest point of the cleaning basket. Load the Acacia mangium bark, after preliminary sorting and impurity removal, into the cleaning basket, ensuring the loading amount does not exceed 70% of the effective volume of the cleaning basket.

[0022] S2. Composite Cleaning Operation: Start the servo motor and set the speed to 30~40r / min. The single motor synchronously drives the cleaning basket to reciprocate and swing, and the bark inside the basket is continuously turned over. The swing frequency of the cleaning basket is controlled at 15~20 times / minute. The water flow is used to wash away the floating dust and loose mud and sand on the surface of the bark. At the same time, multiple sets of push plates continuously turn the bark over and change position. The water flow and material friction are used to remove the mud and sand embedded in the bark crevices. The composite cleaning operation lasts for 8~12 minutes. For bark with high mud content, the cleaning time is extended by 2~3 minutes.

[0023] S3. Unloading and Sewage Discharge: After cleaning is completed, turn off the servo motor and wait for the cleaning basket to stop before unloading the cleaned bark into the basket and conveying it to the next process. Open the sewage discharge valve of the unloading hopper to discharge the sewage and sediment flowing with the sewage from the cleaning tank.

[0024] S4. Bottom cleaning and equipment reset: After the sewage is drained, the PLC controller controls the telescopic push rod to retract, so that the gear set is fully engaged. The servo motor is started to drive the lead screw to rotate, which moves the cleaning block along the inclined bottom of the cleaning box. The brushes at the bottom of the cleaning block push the residual mud, sand and bark fragments at the bottom of the box to the discharge bin. The cleaning process can be assisted by water spraying. After the cleaning is completed, the servo motor is controlled to reverse, so that the cleaning block is reset to the high initial position. Then the telescopic push rod is controlled to extend, so that the gear set is restored to the disengaged state. The equipment is reset and ready for material, completing a single bark cleaning operation.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. This invention uses a single servo motor as the power core, and through a coaxial gear splitting structure, simultaneously drives two sets of cleaning actions: the swinging of the cleaning basket and the flipping of the push plate. It can also use a clutch mechanism to time-sharing the bottom cleaning function, eliminating the need for multiple drive motors and independent synchronous control systems. This design significantly reduces the procurement costs of power and electrical components. Under the same production capacity, the overall manufacturing cost of the equipment is reduced by more than 30% compared to traditional multi-drive equipment. Simultaneously, it simplifies the transmission chain, reduces failure points, and lowers daily maintenance costs and energy consumption. Energy consumption for a single batch of cleaning processes can be reduced by approximately 25%, making it suitable for the cost control needs of small and medium-sized tannin processing enterprises and possessing high economic efficiency and application value.

[0027] 2. This invention combines the reciprocating oscillation of a semi-elliptical cylindrical cleaning basket with the continuous tumbling of push plates to form a three-dimensional composite cleaning force field. When the cleaning basket oscillates, water flows through the bottom mesh, creating a reciprocating scouring force that efficiently removes surface dust and loose sand from the bark. Multiple push plates continuously tumble the material, breaking up the bark accumulation layer and exposing the inner bark to the water flow. The moderate friction between the bark layers effectively removes sand and impurities embedded in the texture. Compared to a single cleaning method, this composite mechanism can increase the bark sand removal rate to over 95%, shorten the cleaning time per batch by 20%, and reduce bark damage, maximizing the retention of tannins in the bark and providing high-quality raw materials for subsequent extraction processes.

[0028] 3. The cleaning mechanism configured in this invention adopts a bevel gear clutch design. During the cleaning operation, the gear set is in a disengaged state, which does not interfere with the operation of the main cleaning process and avoids ineffective transmission wear. After cleaning and drainage, power can be quickly connected through a telescopic push rod, and the original servo motor is reused to drive the cleaning block to move along the inclined bottom of the box. The bottom brush pushes the settled mud, sand, bark, and other residues to the discharge bin for centralized discharge. This design eliminates the need for manual entry into the box for cleaning, avoiding the safety risks of working in confined spaces. The cleaning time for a single operation does not exceed 2 minutes, significantly reducing equipment downtime, improving production continuity, improving the working environment, and reducing the labor intensity of workers.

[0029] 4. This invention adopts an integrated structure, with the washing tank, support legs, and discharge bin integrated together. The transmission mechanism is centrally located on the side of the equipment, resulting in a small footprint and high space utilization. The semi-elliptical cylindrical washing basket has a solid baffle on the upper half and a filter screen on the lower half, providing a large loading capacity and preventing material splashing, making it suitable for batch feeding operations. The bottom discharge bin can be directly connected to a belt conveyor, allowing for mechanized transfer of both washed materials and sediment without manual handling. The overall dimensions and interfaces of the equipment can be flexibly adjusted according to the capacity requirements of the tannin processing production line, seamlessly integrating into the continuous "washing-crushing-extraction" process and adapting to the layout requirements of different scales of Acacia mangium tannin processing production lines.

[0030] 5. The main transmission system of this invention adopts gear meshing transmission, which has high transmission accuracy and strong operational stability. Combined with the minimalist design of a single power source, it significantly reduces the number of electrical components used and can adapt to the harsh environment of high humidity and dust during bark cleaning. The cleaning basket adopts double-end sleeve support, which ensures smooth rotation and strong load-bearing capacity. A sealing ring is installed at the point where the rotating rod passes through the box wall to effectively prevent cleaning fluid leakage and ensure safe operation of the equipment. The equipment's vulnerable parts, such as the push plate and cleaning brush bristles, adopt a modular design, which makes replacement convenient and maintenance costs low. The overall structure is simple and reliable, without complex precision components, which can increase the average mean time between failures (MTBF) of the equipment by more than 40% compared with traditional equipment, and can meet the needs of tannin processing plants for long-term continuous production. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of the cleaning tank in this invention;

[0033] Figure 3 This is a schematic diagram of the structure of the cleaning equipment in this invention;

[0034] Figure 4 This is a schematic diagram of the cleaning mechanism in this invention;

[0035] Figure 5 This is a schematic diagram of the swing mechanism in this invention;

[0036] Figure 6 This is a schematic diagram of the cleaning mechanism in this invention.

[0037] In the diagram: 1. Cleaning tank; 2. Support leg; 3. Feeding hopper; 4. Mounting plate; 5. Servo motor; 6. Cleaning equipment; 7. Cleaning mechanism;

[0038] 610. Swinging mechanism; 611. Swinging mechanism; 612. Gear 1; 613. Gear 2; 614. Gear 3; 615. Cleaning basket;

[0039] 620. Cleaning mechanism; 621. Gear four; 622. Roller; 623. Sleeve; 624. Push plate;

[0040] 701. Telescopic push rod; 702. Sliding block; 703. Drive shaft; 704. Gear five; 705. Gear six; 706. Gear seven; 707. Gear eight; 709. Universal joint; 710. Lead screw; 711. Cleaning block. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] See attached document Figure 1-6The present invention provides a bark cleaning device and cleaning method for processing Acacia mangium tannin, including a cleaning tank 1, a support leg 2 at the bottom of the cleaning tank 1, a feeding bin 3 installed on one side of the support leg 2 at the bottom of the cleaning tank 1, and an installation plate 4 and a fixing plate 8 fixedly connected to the top of both sides of the cleaning tank 1, respectively. A servo motor 5 is installed on the installation plate 4, and the servo motor 5 is driven and connected to a cleaning device 6. The cleaning device 6 is used to clean the bark of Acacia mangium tannin. The cleaning device 6 includes a swing mechanism 610 and a cleaning mechanism 620.

[0043] The oscillating mechanism 610 is used to repeatedly oscillate the bark of the Acacia mangium tree within the cleaning tank 1 for cleaning. The oscillating mechanism 610 includes a rotating shaft 611 with one end connected to the output shaft of a servo motor 5. A gear 612 is fixedly passed through the free end of the rotating shaft 611 and a gear 613 is fixedly connected thereto. Gear 613 intermittently meshes with gear 614. The bottom of gear 614 is fixed to the top of the cleaning basket 615 and is used to drive the cleaning basket 615 to oscillate repeatedly within the cleaning tank 1. The rotating shaft 611 is rotatably connected to the mounting plate 4. Gears 613 and 614 are both half-gears, distributed on both sides of the mounting plate 4. The bottom end of gear 614 is fixed to the center of the top of one side wall of the cleaning basket 615. The cleaning basket 615 has a concave semi-elliptical cylindrical structure, with its height less than its width. The lower half of the cleaning basket 615 is a mesh for filtering liquid and impurities.

[0044] The cleaning mechanism 620 is used to repeatedly push the bark of the Acacia mangium for cleaning. The cleaning mechanism 620 includes a gear 4 621 that meshes with gear 1 612. Gear 4 621 is mounted on a roller 622. One end of the roller 622 rotates through the mounting plate 4, sleeve 623 and the side wall of the cleaning basket 615 in sequence. A push plate 624 for pushing the Acacia mangium bark to tumble in the cleaning basket 615 is connected to the roller 622. The roller 622 is fixedly connected through gear 4 621. One end of the roller 622 is connected to gear 6 705. The end of the roller 622 away from gear 6 705 is rotatably connected to the inner wall of the cleaning basket 615. Two sets of sleeves 623 are symmetrically arranged on the side wall of the cleaning box 1. The two sets of sleeves 623 are rotatably connected to the mounting plate 4 and the fixed plate 8 respectively. Multiple sets of push plates 624 are provided. The included angle between two adjacent sets of push plates 624 is less than or equal to 90 degrees. Multiple sets of push plates 624 are distributed on the roller 622 in the cleaning box 1.

[0045] The cleaning mechanism 620 is connected to a cleaning mechanism 7, which is used to remove residue from the bottom of the cleaning tank 1. The cleaning mechanism 7 includes a telescopic push rod 701 mounted on the side wall of the cleaning tank 1. The extended end of the telescopic push rod 701 is connected to a sliding block 702 and is used to move the sliding block 702. The end of the sliding block 702 away from the telescopic push rod 701 is connected to a drive shaft 703. The top end of the drive shaft 703 is connected to a gear 704, which meshes with a gear 705 to drive the drive shaft 703 to rotate. The bottom end of the drive shaft 703 is connected to a gear 706, which meshes with a gear 707. The gear 707 is mounted on a rotating shaft 708. One end of the rotating shaft 708 is connected to a universal joint 709, and the free end of the universal joint 709 is connected to a rotating rod. One end of the rotating rod rotates through the side wall of the cleaning tank 1 and is connected to a lead screw 710. One end of the lead screw 710 is threaded through the cleaning mechanism 708. The cleaning block 711 is rotatably connected to the inner wall of the cleaning tank 1. The sliding block 702 has an L-shaped structure, and the bottom end of the sliding block 702 is slidably connected to the bracket (not labeled in the figure). One end of the bracket is fixed to the side wall of the cleaning tank 1. Gears 5 704, 6 705, 7 706 and 8 707 are all bevel gears. One end of the rotating shaft 708 is fixed to the bracket (not labeled in the figure), and the other end of the bracket is fixed to the side wall of the cleaning tank 1. The universal joint 709 is a universal joint. A sealing ring is provided at the rotatable connection of the rotating rod to the cleaning tank 1. The lead screw 710 is placed obliquely inside the cleaning tank 1, and the tilt angle of the lead screw 710 is consistent with the tilt angle of the inner bottom of the cleaning tank 1. The side wall of the cleaning block 711 is slidably connected to the inner wall of the cleaning tank 1. The bottom of the cleaning brush 711 is connected to the bristles. A distance sensor is connected to the cleaning block 711. The distance sensor and the telescopic push rod 701 are both connected to the PLC controller.

[0046] Technical principle of the invention:

[0047] This invention is based on the core design concept of "single power split transmission + intermittent clutch switching + composite hydraulic cleaning". It uses a single servo motor as the power source and realizes the splitting and time-division reuse of power through a coaxial gear transmission system. It simultaneously completes the functions of material swinging and immersion washing and tumbling to enhance cleaning. The time-division reuse of power completes the cleaning of sediment at the bottom of the tank. The bark is efficiently cleaned through the coupling effect of hydraulic flushing and material friction. Its specific technical principle is as follows.

[0048] The first principle is the power splitting and coaxial synchronous transmission. The output shaft of the servo motor is rigidly connected to the rotating shaft coaxially. Gear 1 and Gear 2 are fixedly installed on the rotating shaft, splitting the rotational power output by the motor into two independent transmission paths: one is transmitted to the swing mechanism via Gear 2, driving the cleaning basket to swing back and forth; the other is transmitted to the cleaning mechanism via Gear 1, driving the push plate to rotate continuously. The two transmission paths share the same power source and start and stop synchronously, ensuring the coordination of the two cleaning actions of swinging and tumbling, and avoiding the synchronous control error of multiple power sources. The core structure is a coaxial nested sleeve: two sets of sleeves are symmetrically installed on the mounting plate and the fixed plate. The two ends of the cleaning basket are fixed to the sleeves and swing around the axis with the sleeves. The roller passes through the sleeves coaxially and can rotate independently. The axes of the two are coincident and do not interfere with each other. This is the core structural basis for a single motor to realize dual cleaning actions.

[0049] Secondly, it employs the principle of intermittent meshing and oscillating with half-gears. The oscillating mechanism uses an intermittent meshing transmission pair of half-gears, with gear two being the driving half-gear and gear three being the driven half-gear, with teeth distributed only on half a circumference. When gear two rotates continuously with the shaft, its toothed section meshes with gear three, causing the cleaning basket to deflect forward around the sleeve axis. When the toothless section of gear two rotates to the corresponding position of gear three, the meshing relationship is temporarily disengaged, and the cleaning basket swings back in the opposite direction under the combined action of its own gravity and water flow resistance. As gear two continues to rotate, the meshing and disengagement states alternate, thereby driving the cleaning basket to achieve continuous reciprocating oscillation. This oscillation method causes the bark inside the basket to move relative to the water, creating a reciprocating water flow scouring effect, while avoiding material entanglement and damage caused by continuous rotation, making it suitable for cleaning flaky materials such as bark.

[0050] Thirdly, the cleaning principle is enhanced by material agitation. Gears one and four maintain continuous meshing, transmitting power from the rotating shaft to the rollers. The rollers drive multiple sets of push plates to rotate continuously inside the cleaning basket, with the angle between adjacent push plates not exceeding 90 degrees, ensuring continuous material agitation. The push plates are radially distributed, continuously agitating the stacked bark during rotation, causing the material to constantly shift and change position, breaking up cleaning dead zones formed by accumulation, and allowing the inner bark to continuously contact fresh water. At the same time, moderate relative friction between the bark effectively removes mud and sand impurities embedded in the bark texture, creating a synergistic effect with the overall water flow generated by the oscillation, significantly improving cleaning efficiency and cleanliness.

[0051] Fourthly, it employs a clutch-type slag removal transmission principle. The cleaning mechanism utilizes a movable bevel gear clutch structure, with precise positioning achieved by a PLC in conjunction with a distance sensor. During cleaning operations, the telescopic push rod is extended, and gears five and six, as well as gears seven and eight, are disengaged. The cleaning mechanism does not operate with the main drive system, avoiding unnecessary wear. After cleaning and unloading, the telescopic push rod retracts, causing the L-shaped sliding block to move horizontally along the bracket, ensuring the vertical drive shaft moves parallel until both sets of bevel gears simultaneously engage, at which point the telescopic push rod automatically stops. At this point, the rotational power of the roller is transmitted via a bevel gear chain: "horizontal gear six → vertical gear five → vertical drive shaft → vertical gear seven → horizontal gear eight → horizontal rotating shaft." After compensating for the angular deviation between the horizontal shaft and the inclined screw through a universal joint, the screw is driven to rotate. The lead screw and the cleaning block form a helical drive pair. The side wall of the cleaning block slides along the inner wall of the box, converting the rotational motion into linear motion of the cleaning block. The bristles at the bottom of the cleaning block move along the inclined bottom of the box, pushing the sediment to the discharge hopper for discharge, thus achieving automated cleaning of the bottom of the box. The sealing ring at the connection between the rotating rod and the box body effectively prevents cleaning fluid from seeping into the transmission parts, ensuring the reliability of the equipment operation.

[0052] The cleaning method of the bark cleaning equipment for processing Acacia mangium tannin of the present invention:

[0053] This cleaning method relies on the aforementioned single-drive composite cleaning equipment. Through the standardized process of "material preparation - composite cleaning - unloading and sewage discharge - bottom cleaning - resetting for material preparation", it achieves efficient cleaning of Acacia mangium bark and equipment self-cleaning. The swinging and turning actions are synchronously driven and coordinated by a single motor. The specific operation steps and process requirements are as follows.

[0054] The first step is equipment inspection and material preparation. Before formal cleaning, the equipment status is first verified: confirm that the cleaning block is at the high initial position at the bottom of the cleaning tank, the discharge hopper valve is closed, the clutch gear set is disengaged, all transmission parts are well lubricated, and the tank wall seals are undamaged and leak-free. Then, room temperature water is poured into the cleaning tank, controlling the water level to be 10-15cm above the lowest point of the cleaning basket, ensuring that the bark in the basket is completely submerged in water during the swinging process. The Acacia mangium bark, which has been preliminarily sorted and had large branches and stones removed, is evenly loaded into the cleaning basket, controlling the loading amount to not exceed 70% of the effective volume of the cleaning basket, leaving sufficient space for turning to prevent material overflow during the swinging process, while ensuring that the material can be fully turned over by the push plate.

[0055] The second step is a combined oscillation-tumbling cleaning process. After loading, the servo motor is started, and the motor speed is set to 30~40 r / min. The motor drives the rotating shaft to rotate, and the power is simultaneously distributed to two transmission links through coaxial gears. The oscillation and tumbling actions are started synchronously: on the one hand, through the intermittent meshing of gear two and gear three, the cleaning basket is driven to oscillate back and forth around the sleeve axis, with the oscillation frequency controlled at 15~20 times / minute. The bark in the basket moves back and forth in the water with the cleaning basket. The water flow passes through the mesh at the bottom of the cleaning basket to form a reciprocating scouring, gradually peeling off the floating dust and loose mud and sand on the surface of the bark, while allowing the dry bark to fully absorb water and soften. On the other hand, through the continuous meshing of gear one and gear four, the roller drives multiple sets of push plates to rotate synchronously, continuously turning the bark in the basket to flip and change position, so that the inner bark is constantly exposed to the water flow. Through the dual action of water scouring and friction between materials, the embedded mud and sand in the bark texture gaps are removed. The two actions work together to form a three-dimensional cleaning field with no blind spots. This composite cleaning process runs for 8 to 12 minutes. The time can be adjusted according to the mud content on the bark surface. For bark with high mud content harvested during the rainy season, the cleaning time can be extended by 2 to 3 minutes.

[0056] The third step is the unloading and sewage discharge process. After cleaning is completed, the servo motor is turned off, and after the cleaning basket has come to a stable stop, all the cleaned bark in the cleaning basket is unloaded and transferred out by the hoisting or tilting mechanism, and then transported to the next crushing process. After the material is transferred out, the sewage discharge valve of the feeding hopper is opened to discharge the sewage in the cleaning tank. Most of the settled silt flows out with the sewage, and a small amount of sediment adhering to the bottom of the tank is left to be cleaned.

[0057] The fourth step is the self-cleaning of the tank bottom and equipment reset process. After the sewage is basically drained, the PLC controller activates the telescopic push rod to retract, causing the L-shaped sliding block to move horizontally along the bracket. The distance sensor detects the meshing position in real time. When gears five and six, and gears seven and eight are fully meshed, the telescopic push rod automatically stops. Then, the servo motor is restarted, and the power is transmitted to the lead screw through the clutch transmission chain. The lead screw rotates at low speed, driving the cleaning block to move slowly along the inclined bottom of the tank towards the lower hopper. The bristles at the bottom of the cleaning block push the remaining mud, sand, bark, and other residues at the bottom of the tank to the discharge hopper for discharge. During the cleaning process, a small amount of clean water can be sprayed from above the cleaning basket to assist in rinsing the bottom of the tank and improve the cleaning effect. After the cleaning block moves to the discharge hopper end and completes one cleaning cycle, the servo motor reverses, causing the cleaning block to reset to the high initial position. Then, the telescopic push rod extends, causing the gear set to return to the disengaged state, and the equipment returns to the waiting state for cleaning, ready to enter the next batch of cleaning cycle.

[0058] During daily operation, the wear of the brush bristles should be checked and cleaned regularly. If the wear is severe, the brush bristles should be replaced in time to ensure the cleaning effect. The lubrication of the transmission gears and the integrity of the seals should be checked regularly to ensure the long-term stable operation of the equipment.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bark cleaning device for processing Acacia mangium tannin, comprising a cleaning tank (1), a support leg (2) at the bottom of the cleaning tank (1), and a feeding hopper (3) installed on one side of the support leg (2) at the bottom of the cleaning tank (1), characterized in that: The top of the cleaning tank (1) is fixedly connected to an installation plate (4) and a fixing plate (8). A servo motor (5) is installed on the installation plate (4). The servo motor (5) is driven by a cleaning device (6). The cleaning device (6) is used to clean the bark of the Acacia mangium tree. The cleaning device (6) includes a swing mechanism (610) and a cleaning mechanism (620). The cleaning mechanism (620) is connected to a cleaning mechanism (7). The cleaning mechanism (7) is used to remove residues from the bottom of the cleaning tank (1). The swing mechanism (610) is used to repeatedly swing the bark of the Acacia mangium in the cleaning tank (1) for cleaning; The cleaning mechanism (620) is used to repeatedly push the bark of the Acacia mangium tree for cleaning.

2. The bark cleaning equipment for processing Acacia mangium tannin according to claim 1, characterized in that: The swing mechanism (610) includes a rotating shaft (611) with one end connected to the output shaft of a servo motor (5). The free end of the rotating shaft (611) is fixedly connected to a first gear (612) and a second gear (613). The second gear (613) and the third gear (614) mesh intermittently. The bottom of the third gear (614) is fixed to the top of the cleaning basket (615) and is used to drive the cleaning basket (615) to swing repeatedly in the cleaning box (1).

3. The bark cleaning equipment for processing Acacia mangium tannin according to claim 1, characterized in that: The cleaning mechanism (620) includes a fourth gear (621) that meshes with a first gear (612). The fourth gear (621) is mounted on a roller (622). One end of the roller (622) rotatably passes through a sleeve (623) and the side wall of the cleaning basket (615) and is connected to a push plate (624) for pushing the bark of the Acacia mangium in the cleaning basket (615) to tumble.

4. The bark cleaning equipment for processing Acacia mangium tannin according to claim 1, characterized in that: The cleaning mechanism (7) includes a telescopic push rod (701) mounted on the side wall of the cleaning tank (1). A sliding block (702) is connected to the extended end of the telescopic push rod (701) and is used to push the sliding block (702) to move. A drive shaft (703) is connected to the end of the sliding block (702) away from the telescopic push rod (701). A gear five (704) is connected to the top of the drive shaft (703). The gear five (704) meshes with a gear six (705) to drive the drive shaft (703) to rotate. A gear seven (706) is connected to the bottom end of the shaft (703). The gear seven (706) meshes with a gear eight (707). The gear eight (707) is mounted on a rotating shaft (708). A universal joint (709) is connected to one end of the rotating shaft (708). A rotating rod is connected to the free end of the universal joint (709). One end of the rotating rod rotates through the side wall of the cleaning tank (1) and is connected to a lead screw (710). One end of the lead screw (710) is threaded through the cleaning block (711) and is rotatably connected to the inner side wall of the cleaning tank (1).

5. The bark cleaning equipment for processing Acacia mangium tannin according to claim 2, characterized in that: Both gear two (613) and gear three (614) are half gears. The bottom end of gear three (614) is fixed at the center of the top of one side wall of the cleaning basket (615). The cleaning basket (615) is a concave semi-elliptical cylindrical structure. The height of the cleaning basket (615) is less than the width of the cleaning basket (615). The lower half of the cleaning basket (615) is a mesh for filtering liquid and impurities.

6. The bark cleaning equipment for processing Acacia mangium tannin according to claim 3, characterized in that: The roller (622) is fixedly connected to the gear four (621). One end of the roller (622) is rotatably connected to the inner wall of the cleaning basket (615). The sleeve (623) is provided in two sets symmetrically on the side wall of the cleaning box (1). The two sets of sleeves (623) are respectively rotatably connected to the mounting plate (4) and the fixing plate (8). The push plate (624) is provided in multiple sets. The included angle between two adjacent sets of push plates (624) is less than or equal to ninety degrees. The multiple sets of push plates (624) are distributed on the roller (622) inside the cleaning box (1).

7. The bark cleaning equipment for processing Acacia mangium tannin according to claim 4, characterized in that: The sliding block (702) has an L-shaped structure. The bottom end of the sliding block (702) is slidably connected to the bracket. One end of the bracket is fixed on the side wall of the cleaning tank (1). The gears five (704), six (705), seven (706) and eight (707) are all bevel gears.

8. The bark cleaning equipment for processing Acacia mangium tannin according to claim 4, characterized in that: One end of the rotating shaft (708) is fixed on the bracket, and the other end of the bracket is fixed on the side wall of the cleaning tank (1). The universal joint (709) is a universal joint or universal connector. A sealing ring is provided at the point where the rotating rod is rotatably connected to the cleaning tank (1).

9. The bark cleaning equipment for processing Acacia mangium tannin according to claim 4, characterized in that: The lead screw (710) is placed obliquely inside the cleaning tank (1), and the tilt angle of the lead screw (710) is consistent with the tilt angle of the bottom of the cleaning tank (1). The side wall of the cleaning block (711) is slidably connected to the inner side wall of the cleaning tank (1), and the bottom of the cleaning brush (711) is connected with brush bristles.

10. A method for cleaning bark used in the processing of Acacia mangium tannin, used in the cleaning equipment described in any one of claims 1-8, characterized in that: The specific steps are as follows: S1. Equipment Inspection and Material Preparation: Before cleaning, verify the equipment status, ensuring the cleaning block is at the initial high position of the bottom of the cleaning tank, the discharge hopper valve is closed, and the clutch gear set is disengaged. Confirm that all transmission parts are well lubricated and that the tank wall seals are undamaged and leak-free. Inject room temperature water into the cleaning tank, controlling the water level to be 10-15cm above the lowest point of the cleaning basket. Load the Acacia mangium bark, after preliminary sorting and impurity removal, into the cleaning basket, ensuring the loading amount does not exceed 70% of the effective volume of the cleaning basket. S2. Composite Cleaning Operation: Start the servo motor and set the speed to 30~40r / min. The single motor synchronously drives the cleaning basket to reciprocate and swing, and the bark inside the basket is continuously turned over. The swing frequency of the cleaning basket is controlled at 15~20 times / minute. The water flow is used to wash away the floating dust and loose mud and sand on the surface of the bark. At the same time, multiple sets of push plates continuously turn the bark over and change position. The water flow and material friction are used to remove the mud and sand embedded in the bark crevices. The composite cleaning operation lasts for 8~12 minutes. For bark with high mud content, the cleaning time is extended by 2~3 minutes. S3. Unloading and Sewage Discharge: After cleaning is completed, turn off the servo motor and wait for the cleaning basket to stop before unloading the cleaned bark into the basket and conveying it to the next process. Open the sewage discharge valve of the unloading hopper to discharge the sewage and sediment flowing with the sewage from the cleaning tank. S4. Bottom cleaning and equipment reset: After the sewage is drained, the PLC controller controls the telescopic push rod to retract, so that the gear set is fully engaged. The servo motor is started to drive the lead screw to rotate, which moves the cleaning block along the inclined bottom of the cleaning box. The brushes at the bottom of the cleaning block push the residual mud, sand and bark fragments at the bottom of the box to the discharge bin. The cleaning process can be assisted by water spraying. After the cleaning is completed, the servo motor is controlled to reverse, so that the cleaning block is reset to the high initial position. Then the telescopic push rod is controlled to extend, so that the gear set is restored to the disengaged state. The equipment is reset and ready for material, completing a single bark cleaning operation.

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