Ditching and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking functions
Through the linear lifting and lowering adjustment of gear racks and racks and dual-mode vibration anti-blocking mechanism, the depth and blockage problems of traditional trenching and fertilization machinery are solved, and precise control and continuity of trenching depth and fertilization height are achieved.
Patent Information
- Application Number
- CN202510421736.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2045-04-07
AI Technical Summary
Traditional trench fertilization machinery cannot flexibly adjust the depth of trench and the height of fertilizer discharge, resulting in uneven fertilization and easy blockage, affecting crop absorption efficiency.
The linear lifting and lowering adjustment device of the gear rack and rack and the cam-controlled bidirectional self-locking ratchet mechanism are used to achieve synchronous lifting and adjustment of the trench opener and the fertilizer discharge pipe, and is equipped with a dual-motor push-type semi-circular linear vibration mechanism and an eccentric roller rotary high-frequency vibration module to prevent blockage.
It realizes precise control of the depth of trench and the height of fertilization, prevents fertilizer blockage, improves the accuracy and continuity of fertilization, and meets the needs of diversified agricultural scenarios.
Smart Images

Figure CN120283513A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of intelligent agricultural machinery and equipment for black soil protection, and particularly to a ditching and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking functions. Background Art
[0002] Traditional ditching and fertilizing machines mostly adopt an integrated design of fixed ditching tools and fertilizer discharge pipes. In actual operation, the ditching depth usually cannot be flexibly adjusted according to soil conditions, crop requirements, or fertilization techniques. Manual adjustment of the height is required, which is cumbersome and difficult to ensure the consistency of the depths of multiple ditching tools, affecting the uniformity of fertilization. In addition, in different soil environments such as sandy soil and clay soil, the fluctuation of the ditching resistance easily causes the machine to travel unstably, further exacerbating the deviation of the fertilization depth, resulting in uneven fertilizer distribution and affecting the absorption efficiency of crops.
[0003] On the other hand, existing fertilizer discharge devices are prone to produce caked fertilizers when transporting high-humidity organic fertilizers. The fertilizers are easily adhered to and accumulated on the inner wall of the fertilizer discharge pipe, resulting in fertilizer discharge interruption or even blockage. And there is a lack of active anti-blocking measures, and frequent shutdowns for cleaning are required, which seriously restricts the operation efficiency. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to provide, in view of the deficiencies of the prior art, a ditching and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking functions that can adaptively adjust the ditching depth and the height of the fertilizer discharge pipe, and at the same time has high anti-blocking ability to improve the fertilization accuracy and continuity, and meet the needs of diverse agricultural scenarios.
[0005] The technical problem to be solved by the present invention is achieved through the following technical solutions. The present invention is a ditching and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking functions, including a frame. A traction connection device and a depth-limiting wheel are installed on one side of the frame. A ditching tool and a fertilizer discharge pipe are installed on the other side of the frame. The ditching tool and the fertilizer discharge pipe are installed on the frame through a gear-rack linear lifting adjustment device. A cam-controlled bidirectional self-locking ratchet mechanism is installed on the frame for cooperating with the gear-rack linear lifting adjustment device to adjust and lock the heights of the ditching tool and the fertilizer discharge pipe. A slider clamping type ditching tool fixing device for cooperating with the ditching tool is also installed on the frame. A dual-motor push-type semi-circular sheet linear vibration mechanism and an eccentric roller rotary high-frequency vibration module for preventing fertilizers from being blocked during the fertilizer discharge process are also installed on the fertilizer discharge pipe.
[0006] The technical problem to be solved by the present invention can also be further achieved through the following technical solutions. For the above-mentioned furrowing and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking functions, the gear rack linear lifting adjustment device includes a driving shaft, a driven shaft I and a driven shaft II installed on the frame, a driving wheel I is installed on the driving shaft, a driven wheel I and a driven wheel II are installed on the driven shaft I, the driven wheel I is meshed with the driving wheel I, and a driven wheel III meshed with the driven wheel II is installed on the driven shaft II. The furrow opener and the fertilizer discharge pipe are inserted on the frame, a rack I meshed with the driven wheel II is installed on the furrow opener, and a rack II meshed with the driven wheel III is installed on the fertilizer discharge pipe.
[0007] The technical problem to be solved by the present invention can also be further achieved through the following technical scheme. For the above-mentioned ditching and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking functions, a driving motor for driving the driving shaft to drive the driving wheel I to rotate is also installed on the frame.
[0008] The technical problem to be solved by the present invention can also be further achieved through the following technical solutions. For the above-mentioned furrowing and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking functions, the cam-controlled two-way self-locking ratchet mechanism includes a ratchet mounted on the driving shaft, and pawls cooperating with the ratchet are installed on the frames on both sides of the ratchet through springs. A driving wheel II and a driven wheel IV that mesh with each other are installed on the frame between the pawls, and an eccentric cam cooperating with the pawl is also installed on the driven wheel IV.
[0009] The technical problem to be solved by the present invention can be further achieved through the following technical solutions. For the above-mentioned trenching and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking functions, a toggle rod is also fixedly connected to the driving wheel II, and limit blocks cooperating with the toggle rod are also arranged on the frames on both sides of the toggle rod.
[0010] The technical problem to be solved by the present invention can also be further achieved through the following technical solutions. For the above-mentioned furrowing and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking functions, the slider clamping type furrow opener fixing device includes a clamping box installed on a frame, and two symmetrically arranged clamping rods are installed on the clamping box through a lifting mechanism, and a clamping gap for cooperating with the furrow opener is left between the two clamping rods. A wedge-shaped slider for frictionally cooperating with the furrow opener is hinged on the clamping rod at the clamping gap, and a ramp plate cooperating with the wedge-shaped slider is installed on the frame.
[0011] The technical problem to be solved by the present invention can be further achieved through the following technical solutions. For the above-mentioned trenching and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking functions, the lifting mechanism is a hydraulic push rod.
[0012] The technical problem to be solved by the present invention can also be further achieved through the following technical solutions. For the above-mentioned trenching and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking functions, the dual-motor push-type semicircular linear vibration mechanism includes two semicircular plates installed inside the fertilizer discharge pipe, and a support shaft that passes through the fertilizer discharge pipe is installed on the semicircular plate, and a linear motor that is transmission-connected to the support shaft is installed on the outer wall of the fertilizer discharge pipe.
[0013] The technical problem to be solved by the present invention can also be further achieved through the following technical scheme. For the above-mentioned trenching and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking functions, the eccentric roller rotary high-frequency vibration module includes a vibration box installed on the fertilizer discharge pipe, a vibration motor is installed in the vibration box, and eccentric blocks are installed at both ends of the rotor of the vibration motor.
[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. Adaptive adjustment capability: The present invention can adaptively adjust the depth of the furrow opener and the height of the fertilizer pipe through the cooperation of the gear rack linear lifting adjustment device and the cam-controlled two-way self-locking ratchet mechanism. This adjustment method not only improves the flexibility of operation, but also ensures the precise control of the furrowing depth and fertilization height under different soil conditions and operation requirements, thereby improving the accuracy and efficiency of fertilization; 2. High-efficiency anti-blocking capability: The dual-motor push-type semicircular linear vibration mechanism and the eccentric roller rotary high-frequency vibration module installed on the device together constitute a dual-mode vibration anti-blocking system. This design can effectively prevent fertilizer blockage during the fertilizer discharge process and ensure the continuity and stability of fertilization. The dual-mode vibration not only enhances the anti-blocking effect, but also improves the reliability and durability of the device; 3. Improve fertilization accuracy and continuity: Due to its adaptive adjustment and efficient anti-blocking capabilities, the device can maintain high accuracy and continuity during fertilization, which helps reduce fertilizer waste and improve fertilizer utilization, thereby reducing costs and improving crop yields and quality; 4. Meet the needs of diverse agricultural scenarios: The device is flexibly designed and fully functional, and can adapt to different soil conditions, crop types and fertilization needs. Whether it is flat farmland or complex terrain, the device can provide stable and precise fertilization services, meeting the needs of diverse agricultural scenarios. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 A structural schematic diagram of the present invention; Figure 2 A structural side view of the present invention; Figure 3 The structure diagram of the gear rack linear lifting adjustment device of the present invention is shown in FIG. Figure 1; Figure 4 Structural schematic of the gear-rack linear lifting and adjusting device of the present invention Figure 2 ; Figure 5 Structural schematic of the cam-controlled two-way self-locking ratchet mechanism of the present invention Figure 1 ; Figure 6 Structural schematic of the cam-controlled two-way self-locking ratchet mechanism of the present invention Figure 2 ; Figure 7 Structural schematic diagram of the slider clamping type opener fixing device of the present invention; Figure 8 Structural schematic diagram of the eccentric roller rotary high-frequency vibration module of the present invention;
[0016] Figure 9 Structural schematic diagram of the dual-motor pushing type semi-circular sheet linear vibration mechanism of the present invention. Detailed implementation manners
[0017] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0018] Referring to Figure 1-9 , a ditching and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking functions, which realizes efficient operation modes such as synchronous lifting and dual-mode vibration anti-blocking by integrating a variety of advanced technologies and functional components, and provides a more intelligent and efficient solution for agricultural production. Specifically: The device includes a frame 1. The frame 1 serves as the basic support structure of the entire device, and its design is firm and stable. A traction connection device 2 and a depth-limiting wheel 3 are installed on one side of the frame 1. The traction connection device 2 (such as a traction hook or a traction shaft) is used to connect with a tractor or other traction equipment to realize the movement and operation of the device; the depth-limiting wheel 3 is used to control the digging depth of the device during operation to ensure the accuracy and stability of ditching.
[0019] An opener 4 and a fertilizer discharging pipe 5 are installed on the other side of the frame 1, which are used as the core parts of the device. The opener 4 is used to dig a fertilizing groove in the soil, and the fertilizer discharging pipe 5 is responsible for evenly discharging the fertilizer into the groove. The opener 4 and the fertilizer discharging pipe 5 are installed on the frame 1 through a gear-rack linear lifting and adjusting device, which is convenient for height adjustment according to actual operation requirements; Preferably, the gear-rack linear lifting and adjusting device includes a driving shaft 10, a driven shaft I and a driven shaft II mounted on the frame 1. A driving wheel I 11 is mounted on the driving shaft 10. A driven wheel I 16 and a driven wheel II 13 are mounted on the driven shaft I. The driven wheel I 16 meshes with the driving wheel I 11. A driven wheel III 12 meshing with the driven wheel II 13 is mounted on the driven shaft II. The furrow opener 4 and the fertilizer discharging pipe 5 are inserted into the frame 1. A rack I 15 meshing with the driven wheel II 13 is mounted on the furrow opener 4. A rack II 14 meshing with the driven wheel III 12 is mounted on the fertilizer discharging pipe 5. The driving wheel I 11 drives the driven wheel I 16, the driven wheel I 16 drives the driven wheel II 13, the driven wheel II 13 meshes with the driven wheel III 12 and the driven wheel II 13 and the driven wheel III 12 respectively mesh with the rack I 15 and the rack II 14. The rack II 14 and the fertilizer discharging pipe 5 are integrated, and the rack I 15 and the furrow opener 4 are integrated. Thus, the lifting of the furrow opener 4 and the fertilizer discharging pipe 5 is achieved simultaneously by the rotation of the driving wheel I 11. A driving motor for driving the driving shaft 10 to drive the driving wheel I 11 to rotate is also mounted on the frame 1. The driving shaft 10 is driven to rotate by the driving motor. Then, through the cooperation of the driving wheel I 11, the driven wheel I 16, the driven wheel II 13, the driven wheel III 12 and the racks I 15 and II 14, the furrow opener 4 and the fertilizer discharging pipe 5 are driven to perform linear lifting, so as to realize the height adjustment of the furrow opener 4 and the fertilizer discharging pipe 5.
[0020] A cam-controlled two-way self-locking ratchet mechanism 6 for cooperating with the gear-rack linear lifting and adjusting device to adjust and lock the heights of the furrow opener 4 and the fertilizer discharging pipe 5 is mounted on the frame 1 for locking the heights of the furrow opener 4 and the fertilizer discharging pipe 5. The cam-controlled two-way self-locking ratchet mechanism 6 includes a ratchet 17 sleeved on the driving shaft 10. Pawls 18 cooperating with the ratchet 17 are mounted on the frame 1 on both sides of the ratchet 17 through springs 19. A driving wheel II 21 and a driven wheel IV 20 meshing with each other are mounted on the frame 1 between the pawls 18. An eccentric cam 22 cooperating with the pawls 18 is also mounted on the driven wheel IV 20. Through the linkage of the eccentric cam 22 and the pawls 18, two-way selective locking is realized. When the driving shaft 10 needs to rotate clockwise, the eccentric cam 22 pushes the right pawl 18 out of the tooth groove of the ratchet 17 through its curved surface, allowing free clockwise rotation. At the same time, the left pawl 18 meshes with the teeth of the ratchet 17 under the pressure of the spring 19 to prevent counterclockwise rotation. When the driving shaft 10 rotates counterclockwise, the eccentric cam 22 pushes the left pawl 18 out of the tooth groove of the ratchet 17, allowing free counterclockwise rotation. The right pawl 18 meshes with the tooth groove of the ratchet 17 to prevent clockwise rotation. In order to limit the eccentric cam 22, a toggle rod 23 is fixedly connected to the driving wheel II 21. Limit blocks 24 cooperating with the toggle rod 23 are also arranged on the frame 1 on both sides of the toggle rod 23.
[0021] A slider clamping type furrow opener fixing device 7 for cooperating with the furrow opener 4 is also installed on the frame 1, which is used to fix the furrow opener 4 to ensure its stability during operation. The slider clamping type furrow opener fixing device 7 includes a clamping box 25 installed on the frame 1, and two symmetrically arranged clamping rods are installed on the clamping box 25 through a lifting mechanism 26. A clamping gap for cooperating with the furrow opener 4 is left between the two clamping rods, and a wedge-shaped slider 27 for frictionally cooperating with the furrow opener 4 is hinged on the clamping rod at the clamping gap. The ramp plate 29 matched with the wedge-shaped slider 27 makes it easy to use the lifting mechanism 26 to drive the wedge-shaped slider 27 to move along the ramp plate 29 to gradually reduce the distance to clamp the furrow opener 4, and use friction to lock the position of the furrow opener 4 to prevent it from being displaced due to soil resistance during the furrowing operation, thereby ensuring the consistency of the furrowing depth and direction. Preferably, a rubber block 28 is also installed on the wedge-shaped slider 27; the lifting mechanism 26 is used to adjust the height of the clamping rod and the wedge-shaped slider 27, and then adjust the clamping position of the furrow opener 4. Preferably, the lifting mechanism 26 is a hydraulic push rod.
[0022] The fertilizer pipe 5 is also equipped with a double-motor push-type semicircular linear vibration mechanism 8 and an eccentric roller rotary high-frequency vibration module 9 for preventing fertilizer from being blocked during the fertilizer discharge process. Preferably, The dual-motor push-to-push semicircular plate linear vibration mechanism 8 includes two semicircular plates 32 installed inside the fertilizer discharge pipe 5, a support shaft penetrating the fertilizer discharge pipe 5 is installed on the semicircular plate 32, and a linear motor 33 connected to the support shaft is installed on the outer wall of the fertilizer discharge pipe 5. When the linear motor 33 is working, it will push the semicircular plate 32 to perform linear reciprocating motion, generating low-frequency and large-amplitude mechanical shock waves in the fertilizer discharge pipe 5, which are used to break up compacted fertilizer blocks, dredge pipeline blockages, and ensure continuous and uniform transportation of fertilizers; a reciprocating dynamic seal is also installed at the junction of the support shaft and the fertilizer discharge pipe 5; The eccentric roller rotary high-frequency vibration module 9 includes a vibration box installed on the fertilizer discharge pipe 5, in which a vibration motor 30 is installed, and eccentric blocks 31 are installed at both ends of the rotor of the vibration motor 30. When the vibration motor 30 is working, the eccentric blocks 31 will generate centrifugal force and drive the entire vibration box to vibrate slightly at high frequency. This vibration method can more effectively eliminate the electrostatic adsorption and pipe wall adhesion problems of powdered fertilizers in the fertilizer discharge pipe 5, ensure continuous and uniform transportation of fertilizers, and is particularly suitable for powdered fertilizers such as ammonium bicarbonate and ammonium nitrate that are easy to absorb moisture and agglomerate.
[0023] The actual use process of the trenching and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking functions provided by the present invention is as follows: 1. Preparation Before use, a comprehensive inspection of the entire device is required to ensure that all components are intact and the connections are firm and reliable; Check the working conditions of key components such as the gear-rack linear lifting and adjusting device, the cam-controlled two-way self-locking ratchet mechanism 6, and the slider-clamping type furrow opener fixing device 7 to ensure their normal functions; Debug the double-motor pushing type semi-circular plate linear vibration mechanism 8 and the eccentric roller rotating type high-frequency vibration module 9 to ensure good vibration effect and no abnormal noise; Select the appropriate fertilizer type and application rate according to crop requirements and soil conditions; Load the fertilizer into the fertilizer box and ensure that the fertilizer pipeline is unobstructed; Connect the device to a tractor or other traction equipment through the traction connection device 2 to ensure a firm and reliable connection.
[0024] II. Operation Stage Start the engine of the tractor or traction equipment to put the device into working condition; Adjust the heights of the furrow opener 4 and the fertilizer discharge pipe 5 through the gear-rack linear lifting and adjusting device according to the operation requirements; Use the cam-controlled two-way self-locking ratchet mechanism 6 to lock the adjusted height to ensure height stability during the operation process; Under the traction of the tractor or traction equipment, the device starts to move forward and carry out furrow opening operations; The furrow opener 4 opens a fertilizer trench in the soil, and at the same time the fertilizer discharge pipe 5 evenly discharges the fertilizer into the trench; The double-motor pushing type semi-circular plate linear vibration mechanism 8 and the eccentric roller rotating type high-frequency vibration module 9 work simultaneously to prevent fertilizer blockage during the fertilizer discharge process; During the operation process, the operator needs to constantly monitor the working condition of the device to ensure that all parameters meet the requirements; If it is found that parameters such as the furrow opening depth and fertilizer application rate do not meet the requirements, the machine needs to be stopped in time for adjustment.
[0025] III. End Stage After the operation is completed, turn off the engine of the tractor or traction equipment to stop the device from working; Conduct a comprehensive cleaning of the device to remove the soil and fertilizer residues attached to the components; Regularly maintain and service the device, check the wear conditions of each component, and replace the damaged components in time; Lubricate key components such as the gear-rack linear lifting and adjusting device and the cam-controlled two-way self-locking ratchet mechanism 6 to ensure their normal functions; Carry out necessary protective treatments on the device to ensure that it can maintain a good working condition during the next use.
[0026] Through the trinity innovation of "precision control - intelligent anti-blocking - super durability", this device has redefined the technical benchmark of modern precision agricultural equipment. Whether it is a large-scale intensive farm or a special agricultural area with complex terrain, it can achieve the operation goals of "lower cost, higher income, and more sustainable", providing hardcore equipment support for food security and agricultural modernization.
Claims
1. A ditching and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking function, characterized in that: The utility model comprises a frame, a traction connection device and a depth limiting wheel are installed on one side of the frame, a furrow opener and a fertilizer discharge pipe are installed on the other side of the frame, the furrow opener and the fertilizer discharge pipe are installed on the frame through a gear rack linear lifting adjustment device, and a cam-controlled two-way self-locking ratchet mechanism is installed on the frame for cooperating with the gear rack linear lifting adjustment device to adjust and lock the height of the furrow opener and the fertilizer discharge pipe; a slider clamping furrow opener fixing device for cooperating with the furrow opener is also installed on the frame, and a dual-motor push-type semicircular linear vibration mechanism and an eccentric roller rotary high-frequency vibration module are also installed on the fertilizer discharge pipe for preventing fertilizer from being blocked during the fertilizer discharge process.
2. The ditch digging and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking function according to claim 1, characterized in that: The gear rack linear lifting and adjusting device includes a driving shaft, a driven shaft I and a driven shaft II installed on a frame, a driving wheel I is installed on the driving shaft, a driven wheel I and a driven wheel II are installed on the driven shaft I, the driven wheel I is meshed with the driving wheel I, a driven wheel III meshed with the driven wheel II is installed on the driven shaft II, a furrow opener and a fertilizer discharge pipe are inserted on the frame, a rack I meshed with the driven wheel II is installed on the furrow opener, and a rack II meshed with the driven wheel III is installed on the fertilizer discharge pipe.
3. The ditch-opening and fertilizing device with the functions of synchronous lifting and dual-mode vibration anti-blocking according to claim 2, wherein: A driving motor for driving the driving shaft to drive the driving wheel 1 to rotate is also installed on the frame.
4. The ditch digging and fertilizing device with synchronous lifting and dual-mode vibration anti-clogging function according to claim 2, characterized in that: The cam-controlled two-way self-locking ratchet mechanism includes a ratchet mounted on a driving shaft, pawls cooperating with the ratchet are installed on the frames on both sides of the ratchet through springs, a driving wheel II and a driven wheel IV meshing with each other are installed on the frames between the pawls, and an eccentric cam cooperating with the pawl is also installed on the driven wheel IV.
5. The ditching and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking function according to claim 4, characterized in that: A toggle rod is also fixedly connected to the driving wheel II, and limit blocks cooperating with the toggle rod are also arranged on the frames on both sides of the toggle rod.
6. The ditching and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking function according to claim 1, wherein: The slider clamping furrow opener fixing device includes a clamping box installed on a frame, on which two symmetrically arranged clamping rods are installed through a lifting mechanism, a clamping gap for cooperating with the furrow opener is left between the two clamping rods, a wedge-shaped slider for frictionally cooperating with the furrow opener is hinged on the clamping rod at the clamping gap, and a ramp plate for cooperating with the wedge-shaped slider is installed on the frame.
7. The ditch-opening and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking function according to claim 6, characterized in that: The lifting mechanism is a hydraulic push rod.
8. The ditching and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking function according to claim 1, characterized in that: The dual-motor push-type semicircular plate linear vibration mechanism includes two semicircular plates installed inside the fertilizer discharge pipe, a support shaft penetrating the fertilizer discharge pipe is installed on the semicircular plate, and a linear motor connected to the support shaft is installed on the outer wall of the fertilizer discharge pipe.
9. The ditch-opening and fertilizing device with synchronous lifting and dual-mode vibration anti-blocking function according to claim 1 or 8, characterized in that: The eccentric roller rotary high-frequency vibration module comprises a vibration box installed on the fertilizer discharge pipe, a vibration motor is installed in the vibration box, and eccentric blocks are installed at both ends of the rotor of the vibration motor.
Citation Information
Patent Citations
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