A seeding device for agricultural planting
By using agricultural drones to carry seeding devices and utilizing camera navigation and spiral feeding shaft control, the problem of seeding devices having difficulty moving on uneven terrain has been solved, enabling precise aerial seeding and efficient seeding operations.
Patent Information
- Application Number
- CN202611528267.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-30
- Publication Date
- 2026-11-06
AI Technical Summary
Existing agricultural planting and sowing equipment is difficult to operate on uneven terrain, inconvenient, and inefficient.
The plant protection drone carries the seeding device and uses camera navigation. The seeding is quantitatively and orderly discharged through the coordinated control of the spiral feeding shaft and the sealing cover. The design of the connecting shaft and the threaded receiving cylinder facilitates the quick assembly and disassembly of the seeding frame and the angle adjustment.
Completely eliminate terrain limitations, improve the quality and efficiency of sowing operations, achieve precise aerial sowing, avoid clogging and excessive spillage, and enhance adaptability to multiple scenarios and ease of maintenance.
Smart Images

Figure CN123037085A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of agricultural seeding devices, and more specifically to a seeding device for agricultural planting. Background Technology
[0002] Agricultural sowing refers to the crucial step in agricultural production where crop seeds are planted in the soil at specific sizes and densities, allowing them to germinate, grow, and eventually mature into mature plants under suitable temperature, moisture, and nutrient conditions. Before sowing, soil preparation work typically involves land preparation, fertilization, and irrigation to ensure the soil is loose, fertile, and has suitable moisture. Different crops and regions will select appropriate sowing times and row and plant spacing based on climate conditions, planting scale, and crop characteristics. The quality of sowing directly affects the germination rate, seedling growth, and final yield; therefore, it is a core step in the entire agricultural planting cycle, connecting the preceding and following stages, and is related to food security and the realization of agricultural economic benefits.
[0003] In existing agricultural planting and sowing equipment, planting personnel usually carry the sowing machine by hand and walk around the planting field to sow seeds. When sowing on uneven planting ground, the sowing machine is easily affected by the terrain, which makes it difficult to walk. This results in problems such as inconvenience in operation and low efficiency in sowing operations. Summary of the Invention
[0004] The purpose of this invention is to provide a seeding device for agricultural planting, so as to solve the problem that agricultural planting seeding machinery in the prior art is easily affected by terrain.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a seeding device for agricultural planting, comprising an agricultural drone and a plurality of cameras mounted on the agricultural drone, and further comprising: a seeding mechanism disposed at the bottom of the agricultural drone, the seeding mechanism comprising a seeding frame fixedly disposed at the bottom of the agricultural drone, a plurality of seeding chambers fixedly disposed on the seeding frame, a seeding guide tube integrally formed at the bottom of the seeding chamber, and a sealing cap rotatably disposed at the bottom of the seeding guide tube; a drive mechanism disposed on the seeding chamber, the drive mechanism comprising a drive motor fixedly disposed at the top of the seeding chamber, a spiral feeding shaft fixedly disposed at the output end of the drive motor, and the spiral feeding shaft being located inside the seeding chamber; and a connecting mechanism disposed at the bottom of the agricultural drone and on the seeding frame, a threaded receiving cylinder fixedly disposed at the bottom of the agricultural drone, a connecting shaft disposed on the seeding frame, and the seeding frame being fixedly installed at the bottom of the agricultural drone through the connecting shaft in conjunction with the threaded receiving cylinder.
[0006] Furthermore, the sowing mechanism also includes a rotating shaft rotatably disposed on the side wall of the sowing conduit, and the sealing cover is rotatably disposed on the side wall of the sowing conduit via the rotating shaft rotatably disposed; a protective box is also fixedly disposed on the side wall of the sowing conduit, and one end of the rotating shaft rotatably disposed inside the sowing conduit.
[0007] Furthermore, the sowing mechanism also includes a worm gear fixedly disposed at one end of the rotating shaft, an adjusting motor fixedly disposed on the side wall of the sowing guide tube, and a worm fixedly disposed at the output end of the adjusting motor; and the worm and the worm gear are meshed with each other.
[0008] Furthermore, the seeding mechanism also includes several landing gears mounted on the seeding rack.
[0009] Furthermore, the drive mechanism also includes a top cover screwed onto the top of the seeding chamber, and the drive motor is fixedly mounted on the top of the seeding chamber via the top cover; a feed cover is snapped onto the top cover.
[0010] Furthermore, the drive mechanism also includes a battery fixedly disposed inside the seeding rack, and a charging hole opened on the side wall of the seeding rack; a control chip is also fixedly installed inside the seeding rack.
[0011] Furthermore, the connecting mechanism also includes a threaded shaft fixedly disposed on the top of the connecting shaft, and the threaded shaft is paired with the threaded receiving cylinder.
[0012] Furthermore, the connecting mechanism also includes a second rotating shaft rotatably mounted on the seeding frame, and the connecting shaft is rotatably mounted inside the seeding frame via the second rotating shaft; a fixing bolt is screwed onto the side wall of the seeding frame.
[0013] Compared with existing technologies, this invention provides a sowing device for agricultural planting. By having a worker remotely control an agricultural drone, using a camera to observe the flight path, the sowing rack is carried to the target planting area. Upon arrival, the sealing cover is opened; then the drive motor is activated, driving the spiral feeding shaft to rotate, sequentially conveying the seeds stored in the sowing chamber downwards, and evenly discharging them through the bottom of the sowing guide tube, achieving precise aerial sowing. Before sowing, the installation angle of the sowing rack can be adjusted by rotating the connecting shaft in conjunction with the threaded receiving cylinder, and then locked in place to adapt to different sowing directions. The main advantages of this device are: utilizing the aerial flight of an agricultural drone completely eliminates the limitations of terrain on sowing operations, solving the problems of difficulty in walking, inconvenience in operation, and low efficiency of traditional handheld or ground machinery on uneven terrain; the coordinated control of the spiral feeding shaft and the sealing cover achieves quantitative and orderly seed discharge, avoiding blockage or excessive spillage; the cooperative design of the connecting shaft and the threaded receiving cylinder facilitates quick assembly and disassembly of the sowing rack and angle adjustment, improving the device's adaptability to multiple scenarios and ease of maintenance, significantly improving the overall quality and efficiency of sowing operations. Attached Figure Description
[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.
[0015] Figure 1 This is a schematic diagram of the overall structure of the agricultural planting and sowing device provided in an embodiment of the present invention;
[0016] Figure 2 This is a schematic diagram of the seeding rack connection structure provided in an embodiment of the present invention;
[0017] Figure 3 Provided for embodiments of the present invention Figure 2 Schematic diagram of the structure at point A in the middle;
[0018] Figure 4 This is a schematic diagram of the installation structure of the seed bin provided in an embodiment of the present invention;
[0019] Figure 5 This is a schematic diagram of the internal structure of the seeding bin provided in an embodiment of the present invention;
[0020] Figure 6 Provided for embodiments of the present invention Figure 5 Schematic diagram of the structure at point B.
[0021] Explanation of reference numerals in the attached figures:
[0022] 1. Plant protection drone; 2. Seeding rack; 3. Seeding bin; 4. Seeding guide tube; 5. Threaded receiving cylinder; 6. Connecting shaft; 7. Sealing cover; 8. Rotating shaft one; 9. Protective box; 10. Top cover; 11. Threaded shaft; 12. Rotating shaft two; 13. Drive motor; 14. Feed cover; 15. Screw feed shaft; 16. Adjusting motor; 17. Worm gear; 18. Worm wheel; 21. Camera; 22. Fixing bolt; 23. Landing gear. Detailed Implementation
[0023] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.
[0024] As attached Figure 1 To be continued Figure 6 As shown:
[0025] Example 1:
[0026] This invention provides a sowing device for agricultural planting, including an agricultural drone 1 and several cameras 21 mounted on the agricultural drone 1. It also includes: a sowing mechanism located at the bottom of the agricultural drone 1, comprising a sowing frame 2 fixedly mounted at the bottom of the agricultural drone 1, several sowing chambers 3 fixedly mounted on the sowing frame 2, a sowing guide tube 4 integrally formed at the bottom of each sowing chamber 3, and a sealing cover 7 rotatably mounted at the bottom of each sowing guide tube 4; a drive mechanism located on the sowing chambers 3, comprising a drive motor 13 fixedly mounted on the top of the sowing chamber 3, a spiral feeding shaft 15 fixedly mounted at the output end of the drive motor 13, and the spiral feeding shaft 15 located inside the sowing chamber 3; and a connecting mechanism located at the bottom of the agricultural drone 1 and on the sowing frame 2, wherein a threaded receiving cylinder 5 is fixedly mounted at the bottom of the agricultural drone 1, and a connecting shaft 6 is mounted on the sowing frame 2, the sowing frame 2 being fixedly installed at the bottom of the agricultural drone 1 via the connecting shaft 6 and the threaded receiving cylinder 5.
[0027] Meanwhile, by setting up a remote-controlled agricultural drone 1, the drone uses camera 21 to observe the flight path and carry the seeding rack 2 to the target planting area. Upon arrival, the motor 16 drives the worm gear 17 and worm wheel 18 to rotate the rotating shaft 8, opening the sealing cover 7. Then, the drive motor 13 is started to drive the spiral feeding shaft 15 to rotate, conveying the seeds stored in the seeding chamber 3 downwards in sequence and evenly discharged through the bottom of the seeding guide tube 4, achieving precise aerial seeding. During the operation, the installation angle of the seeding rack 2 can be adjusted by rotating the connecting shaft 6 in conjunction with the threaded shaft 11 and the threaded receiving cylinder 5, and locked with the fixing bolt 22 to adapt to different seeding directions. The seeds in the seeding chamber 3 can be replenished through the feed cover 14, and the battery and control chip provide power and remote control for each electrical component. The main advantages of this device are: by utilizing the plant protection drone 1 for aerial flight, it completely eliminates the limitations of terrain on sowing operations, solving the problems of difficulty in walking, inconvenience in operation, and low efficiency of traditional handheld or ground machinery on uneven terrain; through the coordinated control of the spiral feeding shaft 15 and the sealing cover 7, quantitative and orderly seed discharge is achieved, avoiding blockage or excessive spillage; the self-locking structure of the worm gear 17 and worm wheel 18 ensures the stability of opening and closing the sealing cover 7; the cooperative design of the connecting shaft 6 and the threaded receiving cylinder 5 facilitates the quick disassembly and assembly and angle adjustment of the sowing frame 2, improving the device's adaptability to multiple scenarios and ease of maintenance, and significantly improving the overall quality and efficiency of sowing operations.
[0028] refer to Figure 1 , Figure 2 , Figure 3 and Figure 6 The sowing mechanism includes a sowing frame 2, a sowing bin 3, a sowing guide tube 4, a rotating shaft 8, a sealing cover 7, and a landing gear 23;
[0029] By setting up an agricultural drone 1 and several cameras 21 on the agricultural drone 1, the agricultural drone 1 can be used for aerial seeding by the staff in conjunction with the cameras 21, thereby avoiding the influence of terrain on the seeding operation. A seeding frame 2 is fixedly installed at the bottom of the agricultural drone 1, and several seeding bins 3 are fixedly installed on the seeding frame 2, so that the seeding frame 2 can follow the agricultural drone 1 for aerial seeding operations. The seeding bins 3 on the seeding frame 2 can store agricultural seeds, so that the agricultural drone 1 can carry the seeds for aerial planting. Furthermore, a seeding conduit 4 is integrally formed at the bottom of the seeding bin 3, so that the seeds stored inside the seeding bin 3 can be easily exported and sown through the seeding conduit 4.
[0030] Meanwhile, a rotating shaft 8 is fixedly connected to the bottom of the seeding conduit 4, so that the bottom of the seeding conduit 4 can be rotatably connected to the sealing cover 7 via the rotating shaft 8. This allows the sealing cover 7 to seal and protect the seeding conduit 4 and the seeding chamber 3 from the bottom of the seeding conduit 4, preventing the seeds inside the seeding chamber 3 from leaking out from the bottom of the seeding conduit 4. It also makes it easy to rotate and open the sealing cover 7 from the bottom of the seeding conduit 4 when the plant protection drone 1 and the seeding rack 2 arrive at the designated planting area, so that the seeds inside the seeding chamber 3 can be exported from the bottom of the seeding conduit 4 for planting.
[0031] Secondly, a protective box 9 is fixedly installed on the side wall of the seeding guide tube 4, and one end of the rotating shaft 8 is rotatably connected to the inside of the protective box 9. An adjusting motor 16 is also fixedly connected to the side wall of the seeding guide tube 4, and a worm 17 is fixedly connected to the output end of the adjusting motor 16. A worm wheel 18 is fixedly connected to one end of the rotating shaft 8, and the worm 17 and the worm wheel 18 are meshed with each other, so that the worm 17, the worm 17 and the adjusting motor 16 can all be protected inside the protective box 9. Thus, when the sealing cover 7 needs to be opened and closed during the seeding process, the adjusting motor 16 drives the worm 17 to rotate, and the worm 17 drives the worm wheel 18, the rotating shaft 8 and the sealing cover 7 to rotate, thereby facilitating the opening and closing of the sealing cover 7. The meshing structure of the worm 17 and the worm wheel 18 has self-locking properties, which improves the stability of the rotation of the sealing cover 7.
[0032] In addition, several landing gears 23 are provided on the seeding rack 2, so that when the plant protection drone 1 drives the seeding rack 2 to lift and sow, it can be supported by the landing gears 23, thereby avoiding direct contact between the seeding rack 2, the seeding tube 4 and the sealing cover 7 on the seeding rack 2 and the ground. The spacing between the several seeding chambers 3 and the seeding tube 4 on the seeding rack 2 can be customized to adapt to different planting operations.
[0033] Example 2:
[0034] refer to Figure 2 , Figure 4 and Figure 5 The drive mechanism includes a top cover 10, a drive motor 13, a screw feed shaft 15, and a feed cover 14;
[0035] A top cover 10 is screwed onto the top of the seeding bin 3, allowing for easy removal and installation from the top of the seeding bin 3. This facilitates maintenance and other operations inside the seeding bin 3. A drive motor 13 is fixedly connected to the top cover 10, enabling easy installation of the drive motor 13 onto the seeding bin 3. A screw feed shaft 15 is fixedly installed at the output end of the drive motor 13, and the screw feed shaft 15 is positioned inside the seeding bin 3, allowing the drive motor 13 to drive the screw feed shaft 15 to rotate inside the seeding bin 3. This allows the seeder 2 to plant seeds through several seeding chambers 3 and seeding conduits 4. After the plant protection drone 1 flies the seeder 2 to the planting area, the sealing cover 7 is opened first, and then the drive motor 13 drives the spiral feeding shaft 15 inside the seeding chamber 3 to rotate. This causes the spiral feeding shaft 15 to rotate and convey the seeds stored in the seeding chamber 3 downwards in sequence, and then export them for planting through the bottom of the seeding conduit 4. This facilitates the sequential export and planting of the seeds stored in the seeding chamber 3, avoiding the problem of all the seeds in the seeding chamber 3 being exported directly and causing blockages.
[0036] Meanwhile, a feed cover 14 is also attached to the top cover 10, so that when seeds need to be introduced into the seeding chamber 3, the feed cover 14 can be opened and the seeds can be introduced into the seeding chamber 3 through the opening on the top cover 10 for temporary storage.
[0037] Secondly, a storage battery and a control chip are also fixedly installed inside the seeding rack 2, so that the storage battery inside the seeding rack 2 can provide power to several electrical components installed on the seeding rack 2, and the control chip can establish a wireless connection with the ground staff through a wireless connection, so that the ground staff can control the drive motor 13, the screw feeding shaft 15, the rotating shaft 8 and the sealing cover 7 on the seeding rack 2.
[0038] Example 3:
[0039] refer to Figure 1 , Figure 2 and Figure 4 The connecting mechanism includes a threaded receiving cylinder 5, a connecting shaft 6, a threaded shaft 11, a rotating shaft 12, and a fixing bolt 22;
[0040] By fixing a threaded receiving cylinder 5 to the bottom of the plant protection drone 1, it is easy to install a seeding frame 2 on the bottom of the plant protection drone 1 through the threaded receiving cylinder 5. A rotating shaft 12 is rotatably connected inside the seeding frame 2, so that a connecting shaft 6 is rotatably connected inside the seeding frame 2 through the rotating shaft 12. This facilitates the rotation and adjustment of the connecting shaft 6 inside the seeding frame 2. A threaded shaft 11 is fixedly connected to the top of the connecting shaft 6, and the threaded shaft 11 is paired with the threaded receiving cylinder 5. When the seeding frame 2 is installed at the bottom of the plant protection drone 1, the connecting shaft 6 can be rotated to screw the threaded shaft 11 into the inside of the threaded receiving cylinder 5. This achieves the purpose of installing the seeding frame 2 at the bottom of the plant protection drone 1 and facilitates the disassembly and maintenance of the seeding frame 2.
[0041] Meanwhile, a fixing bolt 22 is screwed onto the side wall of the seeding frame 2, so that after the seeding frame 2 is rotatably installed on the bottom of the plant protection drone 1 via the connecting shaft 6, the angle of use of the seeding frame 2 can be adjusted. Then, by screwing the fixing bolt 22, the end of the fixing bolt 22 is pressed against the side wall of the connecting shaft 6, thereby achieving the purpose of fixing the angle of use of the seeding frame 2.
[0042] Working Principle: First, the operator needs to prepare before takeoff by opening the feed cover 14 on the top of the seeding chamber 3 and temporarily storing the crop seeds inside each seeding chamber 3 through the opening on the top cover 10. Then, the feed cover 14 is tightened to prevent spillage during flight. Simultaneously, the battery power inside the seeding rack 2 is checked, and a wireless connection is established with the ground remote control terminal via the control chip to ensure smooth signal transmission for all electrical components. Next, the seeding rack 2 is installed on the bottom of the agricultural drone 1: by rotating the connecting shaft 6, the threaded shaft 11 at its top is screwed into the threaded receiving cylinder 5 fixed at the bottom of the agricultural drone 1, firmly fixing the seeding rack 2. According to actual sowing needs, the installation angle of the seeding rack 2 is adjusted by rotating the second shaft 12, and then the fixing bolt 22 is screwed on to press the end against the side wall of the connecting shaft 6, locking the angle. After preparation, the operator remotely controls the agricultural drone 1 to take off, using several cameras 21 installed on the agricultural drone 1 to observe the flight path and the planting area below in real time, and controls the agricultural drone 1 to fly over the target planting area carrying the seeding rack 2. Upon reaching the designated planting area, the regulating motor 16 is first activated. Its output drives the worm gear 17 to rotate, which in turn drives the meshing worm wheel 18 to rotate. This, in turn, drives the sealing cover 7 to rotate and open from the bottom of the seeding guide tube 4 via the rotating shaft 8, ensuring unobstructed flow at the lower end of the seeding guide tube 4. Next, the drive motor 13 is activated. Its output drives the spiral feeding shaft 15 located inside the seeding chamber 3 to rotate. The spiral feeding shaft 15 pushes the seeds stored in the seeding chamber 3 downwards sequentially, allowing the seeds to enter the seeding guide tube 4 in an orderly manner and be evenly discharged from the bottom-opened sealing cover 7, achieving precise aerial seeding. During aerial seeding, the operator can adjust the flight altitude, speed, and path of the plant protection drone 1 in real time based on the feedback from the camera 21, ensuring that the seeds are sown according to the preset specifications and density. When the seeds in a certain seeding chamber 3 are insufficient, the drive motor 13 of that chamber can be paused. After the plant protection drone 1 lands, seeds can be replenished through the feed cover 14 before continuing the operation. After the sowing operation is completed, the operator first turns off the drive motor 13 to stop seeding, then starts the regulating motor 16 to rotate in the opposite direction. This rotates the sealing cover 7 through the worm gear 17 and worm wheel 18, resealing the bottom of the sowing tube 4 to prevent any remaining seeds from leaking out during the return journey. Then, the operator controls the plant protection drone 1 to return and land. Upon landing, the landing gear 23 on the sowing frame 2 contacts the ground first, providing support and protection for the sowing frame 2, sowing tube 4, and sealing cover 7, preventing them from being damaged by direct impact with the ground. Finally, if the sowing frame 2 needs to be replaced or repaired, simply loosen the threaded shaft 11 in the opposite direction to remove the sowing frame 2 from the bottom of the plant protection drone 1 for easy cleaning and maintenance. Throughout the entire process, the battery continuously powers the drive motor 13, regulating motor 16, and control chip. The control chip maintains constant wireless communication with the ground, providing real-time feedback on the operating status of each component, ensuring remote controllability and stable operation of the entire sowing process.
[0043] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.
Claims
1. A seeding device for agricultural planting, comprising an agricultural drone (1) and a plurality of cameras (21) mounted on the agricultural drone (1), characterized in that, Also includes: The seeding mechanism is located at the bottom of the plant protection drone (1). The seeding mechanism includes a seeding frame (2) fixedly installed at the bottom of the plant protection drone (1). Several seeding chambers (3) are fixedly installed on the seeding frame (2). A seeding guide tube (4) is integrally formed at the bottom of the seeding chamber (3). A sealing cover (7) is rotatably installed at the bottom of the seeding guide tube (4). A drive mechanism is provided on the seeding bin (3). The drive mechanism includes a drive motor (13) fixedly installed on the top of the seeding bin (3). A spiral feeding shaft (15) is fixedly installed at the output end of the drive motor (13), and the spiral feeding shaft (15) is located inside the seeding bin (3). A connecting mechanism is provided on the bottom of the plant protection drone (1) and the seeding frame (2). A threaded receiving cylinder (5) is fixedly provided on the bottom of the plant protection drone (1), and a connecting shaft (6) is provided on the seeding frame (2). The seeding frame (2) is fixedly installed on the bottom of the plant protection drone (1) through the connecting shaft (6) and the threaded receiving cylinder (5).
2. The seeding device for agricultural planting according to claim 1, characterized in that, The sowing mechanism also includes a rotating shaft (8) rotatably disposed on the side wall of the sowing conduit (4), and the sealing cover (7) is rotatably disposed on the side wall of the sowing conduit (4) via the rotating shaft (8). The side wall of the seeding guide tube (4) is also fixedly provided with a protective box (9), and one end of the rotating shaft (8) is rotatably disposed inside the seeding guide tube (4).
3. A seeding device for agricultural planting according to claim 2, characterized in that, The sowing mechanism also includes a worm gear (18) fixedly installed at one end of the rotating shaft (8), an adjusting motor (16) fixedly installed on the side wall of the sowing guide tube (4), and a worm (17) fixedly installed at the output end of the adjusting motor (16). Furthermore, the worm (17) and the worm wheel (18) are meshed with each other.
4. A seeding device for agricultural planting according to claim 3, characterized in that, The sowing mechanism also includes several landing gears (23) mounted on the sowing rack (2).
5. A seeding device for agricultural planting according to claim 1, characterized in that, The drive mechanism also includes a top cover (10) screwed onto the top of the seeding bin (3), and the drive motor (13) is fixedly mounted on the top of the seeding bin (3) through the top cover (10); The top cover (10) is fitted with a feed cover (14).
6. A seeding device for agricultural planting according to claim 5, characterized in that, The drive mechanism also includes a battery fixedly installed inside the seeding rack (2) and a charging hole opened on the side wall of the seeding rack (2); The seeding rack (2) also has a control chip fixedly installed inside.
7. A seeding device for agricultural planting according to claim 1, characterized in that, The connecting mechanism also includes a threaded shaft (11) fixedly disposed on the top of the connecting shaft (6), and the threaded shaft (11) is paired with the threaded receiving cylinder (5).
8. A seeding device for agricultural planting according to claim 7, characterized in that, The connecting mechanism further includes a second rotating shaft (12) rotatably mounted on the seeding rack (2), and the connecting shaft (6) is rotatably mounted inside the seeding rack (2) via the second rotating shaft (12); The side wall of the seeding rack (2) is screwed with a fixing bolt (22).
