Large-diameter movable agricultural well digging device, manufacturing method and application

Abstract

The invention discloses a large-diameter movable agricultural well digging device and a manufacturing method and application thereof.The device comprises a tractor body, a rack, winches and a drill rod, a supporting frame is arranged at the right end of the tractor body, the rack is vertically arranged on the supporting frame, the two winches are arranged on the lower middle portion of the rack, and the drill rod is arranged on the rack; a brake mechanism is arranged above the winches, two wire guide wheels are arranged on the top of the machine frame, a pull wire on one winch bypasses one wire guide wheel to be connected with a drill bit shell, a pull wire on the other winch bypasses the other wire guide wheel to be connected with a drill rod, a drill bit driving mechanism is arranged in the middle of the drill rod, and the drill bit driving mechanism drives the drill bit shell to rotate. A spiral blade is arranged at the bottom of the drill rod; the two winches are switched to work, the drill rod or the drill bit shell can be driven to move, so that drilling and well digging at different depths are achieved, meanwhile, workers can conveniently clean mud in the drill bit shell, the lift of well drilling equipment is improved, various requirements of users are met, and the drilling equipment is convenient to use, easy to operate and easy to popularize.

Description

Technical Field

[0001] The present invention relates to a well drilling device, in particular to a large-diameter movable agricultural well drilling device, a manufacturing method and an application, belonging to the technical field of drilling wells. Background Art

[0002] Well drilling machines are mainly used for developing underground water resources, including drilling work for domestic water, agricultural water, industrial water, etc. With the in-depth implementation of the national rural revitalization and people-enriching policies, great changes have taken place in the supply side structure in rural areas. Many barren mountains, beaches, slopes, and wastelands have been developed and utilized, becoming orchards, special plantations, farms, etc., which have become treasure lands for farmers to generate income. Of course, all these are inseparable from wells and water sources; thus, teams of well drillers have emerged in the countryside. Most of them work in groups of two, moving around to serve the villagers in need.

[0003] Existing well drillers are only limited to drilling small-diameter wells with a diameter of 4 - 5 cm. For such a borehole diameter, only rigid plastic pipes with a diameter of less than 5 cm can be inserted. A water pump of about 1 kw is installed on the ground, with a suction lift of about 6 m; or a semi-mechanized manual water pump is installed, but such a well hole can only be suitable for farmers with relatively small water demands and cannot meet the needs of farmers with relatively large water demands; for farmers with large water consumption, there is an urgent need to configure a submersible pump device with a large water output and a high lift. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art and provide a large-diameter movable agricultural well drilling device, a manufacturing method and an application, which can install a submersible pump with a high lift and a large water output to meet various needs of users.

[0005] The technical solution adopted by the present invention to solve the technical problem is: A large-diameter movable agricultural well drilling device includes a tractor body, a frame, a winch, and a drill pipe. A support frame is provided at the right end of the tractor body, and a frame is vertically provided on the support frame. Two winches are provided in the middle and lower part of the frame. A braking mechanism is provided above the winch. Two wire wheels are provided at the top of the frame. The wire rope of one of the winches passes around one of the wire wheels and is connected to the drill bit housing, and the wire rope of the other winch passes around the other wire wheel and is connected to the drill pipe. The drill bit housing is sleeved on the drill pipe. A drill bit driving mechanism is provided in the middle of the drill pipe, and a spiral blade is provided at the bottom of the drill pipe. The drill pipe is a square drill pipe.

[0006] A first support rod is provided at the left end of the tractor body. A reinforcing rod is provided between the first support rod and the frame, and the right end of the reinforcing rod is fixedly connected to the lower frame body.

[0007] The frame is composed of an upper frame body and a lower frame body. The two ends of the upper frame body are located inside the lower frame body. The outer wall of the lower end of the upper frame body is rotatably connected to the inner wall of the upper end of the lower frame body and is fixed by bolts outside the lower frame body. The wire wheel is located at the top of the upper frame body, and the braking mechanism is located on the lower frame body.

[0008] A third support shaft is provided in the middle and lower part of the frame. Two winches are provided on the third support shaft, and two wire wheels are provided at positions corresponding to the top of the frame. A second support shaft is rotatably connected below the winch. A first support shaft is provided below the second support shaft, and both ends of the first support shaft are fixedly connected to the inner wall of the frame. A displacement gear is slidably connected to the second support shaft. A first limit groove is provided below the displacement gear, and the first limit groove is slidably connected to the first support shaft. The end of the second support shaft is fixedly connected with a V-belt pulley. The V-belt pulley is located outside the frame, and the V-belt pulley is connected to the tractor engine through a chain. A second support rod is provided at the left end of the first limit groove. A second limit groove is provided at the end of the second support rod. A bracket is provided on the frame behind the second limit groove. A limit post is provided on the bracket. A positioning sleeve is sleeved on the limit post. A first limit handle is provided outside the positioning sleeve, and the top of the first limit handle is located on the second limit groove.

[0009] The winch is composed of a disc, a toothed ring and a central shaft. Discs are fixedly connected to both ends of the central shaft, and a toothed ring is sleeved on the outer wall of the inner disc. The central shaft is rotatably connected to the third support shaft, and a pull wire is wound on the central shaft.

[0010] The braking mechanism is composed of a bearing seat, a brake rod and a second limit handle. There are two bearing seats, which are respectively located on both sides of the frame and above the winch. A brake rod is rotatably connected in the bearing seat. A second limit handle is provided on the brake rod. A brake band is provided at the end of the second limit handle. There are two second limit handles, which respectively correspond to the discs at the ends of the lower winches.

[0011] The drill bit housing is composed of a central sleeve ring, a connecting frame, a half shell and a positioning ring. The central sleeve ring is sleeved on the drill pipe. Connecting frames are respectively provided on both sides of the central sleeve ring. Half shells are respectively provided on both sides of the connecting frame. One end of the half shell is hinged to one end of one of the connecting frames. A positioning ring is provided at the other end of the half shell, and the positioning ring is fixedly connected to the connecting frame through a positioning bolt.

[0012] The drill drive mechanism consists of a bevel gear set and a sprocket. The bevel gear set consists of a small bevel gear and a large bevel gear. The inner wall of the support frame is provided with a first sprocket and is connected to the tractor engine through a chain. The central axis of the small bevel gear is fixedly connected to the first sprocket. The large bevel gear is meshed and connected to the small bevel gear. A square hole is dug in the center of the large bevel gear. The drill rod passes through the square hole and is slidably connected to the large bevel gear.

[0013] The manufacturing method of the large-caliber movable agricultural well-drilling device comprises the following steps: S1. Prepare the materials needed for construction: 1 small tractor, 3 old steel pipes (6m long), 2 old channel steels (6m long), 2 winches, 1 set of bevel gears, 1 rectangular steel plate, 1 set of turning rods, 2 steel cables, 2 double sprockets, and 1 double chain. S2. Disassemble the gearbox at the rear of the tractor, remove the tractor's reverse gear shaft, and weld a 50mm short shaft to its left end. The short shaft must extend 45mm beyond the gearbox housing. Lathe the shaft so that its end can accommodate a 33-tooth 16A double sprocket. S3. Install a first sprocket on the inner wall of the support frame. The first sprocket is connected to the double sprocket through a chain. The central axis of the small bevel gear is fixedly connected to the center of the inner side of the first sprocket. The end of the small bevel gear is meshed with the large bevel gear. S4. Pass the drill rod through the large bevel gear, and securely connect the upper end of the drill rod to the pull rope on one of the winches. S5. Install a drill bit on the lower part of the drill pipe. The through hole of the drill bit's center collar is a square hole that matches the drill pipe. The drill bit is fixedly connected to the pull rope on another winch. S6. Weld spiral blades at the bottom of the drill pipe.

[0014] The construction method of the large-caliber movable agricultural well-drilling device comprises the following steps: S1. Start the tractor and put the tractor's high and low gears in neutral. Since most small tractors have a seesaw-type control mechanism, you need to depress the clutch, then put the tractor's control handle in reverse gear and release the clutch. At this point, the tractor's reverse gear shaft begins to rotate at high speed, and the tractor's drive wheels have no power output and do not rotate. S2. The double-row chain on the left side of the tractor's reverse gear shaft rotates rapidly, driving the small bevel gear on the drilling rig at the rear of the tractor. The large bevel gear, through its square hole and slideway, forces the square drill rod inside it to rotate at high speed. The drill bit, driven downward by its own weight and the spiral blades on the drill rod head, digs downward. S3. After the drill pipe works for 1 - 2 minutes, operate the first limit handle on the hoist to engage the displacement gear with the toothed ring on one of the hoists, and wind the cable to lift the drill bit housing and the soil inside along the drill pipe to the ground. During the lifting process, the central drill pipe is not lifted. S4. After braking with the brake band, clear the soil inside, then slowly release the brake band. Under the action of its own gravity, the drill bit housing slides down along the square drill pipe to the bottom of the drill bit. At this time, operate the tractor gear lever and place it in the reverse gear position. The drill pipe continues to drill down and repeat the operation until the well depth meets the requirements. S5. After the well hole is drilled, lower the well pipe successively according to the well depth. After the well pipe is lowered, pour a small amount of gravel into the well, and then use a submersible pump to pump out the well water.

[0015] The positive and beneficial effects of the present invention are: 1. The present invention is provided with two hoists on the third support shaft. During use, by moving the displacement gear, the gear is engaged with the toothed ring outside the corresponding hoist. When the generator of the tractor drives the rotation of the V - belt pulley, the displacement gear can drive the rotation of one of the hoists. When the hoist does not need to rotate, the brake band at the end of the second limit handle is wound around the disc of the hoist and hung to fix the hoist, playing a role in limiting.

[0016] 2. By switching the rotation of the two hoists, the present invention can drive the movement of the drill pipe or the drill bit housing, thereby realizing drilling and well - digging at different depths. At the same time, it can also clean the mud in the drill bit housing according to the excavation situation, improving the lift of the device, meeting various needs of users, and being convenient to use and simple to operate.

[0017] 3. The frame of the present invention is composed of an upper frame body and a lower frame body. After the device is used up, the upper frame body and the lower frame body can be folded, which is convenient for the transportation of the device and avoids the inconvenience caused by road height limits. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the brake mechanism of the present invention; Figure 3 is a schematic structural diagram of the drill bit housing of the present invention; Figure 4 is a top view of the drill bit housing of the present invention; Figure 5 is a schematic structural diagram of the drill pipe of the present invention; Figure 6 is a schematic structural diagram of the tractor drive device of the present invention; Figure 7Schematic diagram of the transmission structure of the tractor of the present invention; Wherein: 1-frame, 2-supporting frame, 3-first supporting rod, 4-strengthening rod, 5-wire pulley, 6-braking mechanism, 601-third supporting shaft, 602-winch, 603-bearing seat, 604-braking lever, 605-second limiting handle, 7-drill pipe, 701-spiral blade, 8-bit driving mechanism, 9-bit housing, 901-connecting frame, 902-half housing, 903-positioning ring, 904-positioning bolt, 10-bracket, 11-positioning sleeve, 12-first limiting handle, 13-first supporting shaft, 14-second supporting shaft, 15-first limiting groove, 16-second supporting rod, 17-second limiting groove, 18-displacement gear, 191-V-belt pulley, 192-sprocket, A-tractor engine, B-tractor gearbox. Specific implementation method

[0019] The present invention will be further explained and described below with reference to the accompanying drawings: Embodiment 1, a large-diameter movable agricultural well drilling device, including a tractor body, a frame 1, a winch 602 and a drill pipe 7. A supporting frame 2 is arranged at the right end of the tractor body, a frame 1 is vertically arranged on the supporting frame 2, two winches 602 are arranged at the middle and lower parts of the frame 1, a braking mechanism 6 is arranged above the winch 602, and two wire pulleys 5 are arranged at the top of the frame 1. The wire of one winch 602 bypasses one wire pulley 5 and is connected to the bit housing 9, and the wire of the other winch (602) bypasses the other wire pulley 5 and is connected to the drill pipe 7. The bit housing 9 is sleeved on the drill pipe 7. A bit driving mechanism 8 is arranged in the middle of the drill pipe 7, and a spiral blade 7 is arranged at the bottom of the drill pipe 7. The drill pipe 1 is a square drill pipe.

[0020] The frame 1 is composed of an upper frame body 101 and a lower frame body 102. The two ends of the upper frame body 101 are located inside the lower frame body 102. The outer wall of the lower end of the upper frame body 101 is rotationally connected to the inner wall of the upper end of the lower frame body 102 and is fixed by bolts 103 outside the lower frame body 102. The wire pulley 5 is located at the top of the upper frame body 101, and the braking mechanism 6 is arranged on the lower frame body 102.

[0021] A first supporting rod 3 is arranged at the left end of the tractor body, and a strengthening rod 4 is arranged between the first supporting rod 3 and the frame 1, and the strengthening rod 4 is fixedly connected to the lower frame body 102.

[0022] A third support shaft 601 is provided in the middle and lower part of the frame 1. Two winches 602 are provided on the third support shaft 601. Two wire wheels 5 are provided at positions corresponding to the top of the frame 1. A second support shaft 14 is rotatably connected below the winch 602. A first support shaft 13 is provided below the second support shaft 14. Both ends of the first support shaft 13 are fixedly connected to the inner wall of the frame 1. A displacement gear 18 is slidably connected to the second support shaft 14. A first limit groove 15 is provided below the displacement gear 18. The first limit groove 15 is slidably connected to the first support shaft 13. The end of the second support shaft 14 is fixedly connected with a V-belt pulley 191. The V-belt pulley 191 is located outside the frame 1 and is connected to the tractor engine through a chain. A second support rod 16 is provided at the left end of the first limit groove 15. A second limit groove 17 is provided at the end of the second support rod 16. A bracket 10 is provided on the frame 1 behind the second limit groove 17. A limit post is provided on the bracket 10. A positioning sleeve 11 is sleeved on the limit post. A first limit handle 12 is provided outside the positioning sleeve 11. The end of the first limit handle 12 is located on the second limit groove 17.

[0023] The winch 602 is composed of a disc, a toothed ring and a central shaft. Discs are fixedly connected to both ends of the central shaft. A toothed ring is sleeved on the outer wall of the inner disc. The central shaft is rotatably connected to the third support shaft 601, and a pull wire is wound on the central shaft.

[0024] The braking mechanism is composed of bearing seats 603, braking rods 604 and second limit handles 605. There are two bearing seats 603, which are respectively located on the two side rods of the frame 1 and at positions above the winch 602. A braking rod 604 is rotatably connected in the bearing seat 603. A second limit handle 605 is provided on the braking rod 604. A braking belt is provided on the second limit handle 605. There are two second limit handles 605, which respectively correspond to the discs at the ends of the two lower winches 602.

[0025] The drill bit housing 9 is composed of a central collar, a connecting frame 901, a half shell 902 and a positioning ring 903. The central collar is sleeved on the drill pipe 1. Connecting frames 901 are respectively provided on both sides of the central collar. Half shells 902 are respectively provided on both sides of the connecting frame 901. One end of the half shell 902 is hinged to one end of one of the connecting frames 901. A positioning ring 903 is provided at the other end of the half shell 902, and the positioning ring 903 is fixedly connected to the connecting frame 901 through a positioning bolt 904.

[0026] The drill drive mechanism 8 is composed of a bevel gear set and a sprocket 192. The bevel gear set consists of a small bevel gear and a large bevel gear. A first sprocket is provided on the inner wall of the support frame 2 and is connected to the tractor engine through a chain. The central shaft of the small bevel gear is fixedly connected to the first sprocket. The large bevel gear is meshed and connected to the small bevel gear. A square hole is dug in the center of the large bevel gear. The drill rod 1 passes through the square hole and is slidably connected to the large bevel gear.

[0027] In the above description, the upper frame body is rotatably connected to the lower frame body for the transportation of the device. During use, the two are fixed together through the bolts on the outer wall of the lower frame body, making the upper and lower parts in a vertical state.

[0028] In the above description, bolts are provided on the outer wall of the lower frame body, and bolt positioning holes are provided at the corresponding positions on the outer wall of the upper frame body. During use, the bolts are connected to the lower frame body through threads and tightened with the bolt positioning holes through threads.

[0029] In the above description, the brake mechanism, the third support shaft, the second support shaft, and the first support shaft are all located on the lower frame body.

[0030] In the above description, a drill rod is provided on the right side of the frame. A drill drive mechanism is provided in the middle of the drill rod, and a drill bit housing is sleeved on the middle and lower parts of the drill rod.

[0031] In the above description, the connecting frames on both sides of the central collar are distributed in a T shape. The two half shells enclose the space on both sides of the connecting frames. The positioning bolts are distributed in an L shape. By rotating the positioning bolts, the positioning ring can be fixedly connected to the connecting frames.

[0032] In the above description, the winch corresponds to the position of the upper wire pulley. The wire on the winch bypasses the wire pulley at the top of the frame and is fixedly connected to the corresponding device.

[0033] In the above description, a gearbox is provided on the right side of the tractor. A first V-belt pulley is provided on one side of the gearbox. A second V-belt pulley is provided at the corresponding position of the tractor engine. The two V-belt pulleys are connected together through a chain. The first V-belt pulley is connected to the V-belt pulley outside the frame through a chain. A second sprocket is provided at the end of the reverse gear shaft on the other side of the gearbox. This sprocket is connected to the first sprocket on the inner wall of the support frame 2 through a chain.

[0034] In the above description, the displacement gear is meshed and connected to the tooth ring outside the inner disc of the winch.

[0035] In the above description, a connecting shaft is provided outside the frame, and the connecting shaft is fixedly connected to the end of the second support shaft. The second support shaft is rotatably connected to the frame.

[0036] In the above description, the second limiting handle is distributed in an L shape.

[0037] In the above description, the pull wire on the winch is a steel wire rope.

[0038] Example 2, a method for manufacturing the above-mentioned large-caliber movable agricultural well-drilling device, comprises the following steps: S1. Prepare the materials needed for construction: 1 small tractor, 3 old steel pipes (6m long), 2 old channel steels (6m long), 2 winches, 1 set of bevel gears, 1 rectangular steel plate, 1 set of turning rods, 2 steel cables, 2 double sprockets, and 1 double chain. S2. Disassemble the gearbox at the rear of the tractor, remove the tractor's reverse gear shaft, and weld a 50mm short shaft to its left end. The short shaft must extend 45mm beyond the gearbox housing. Lathe the shaft so that its end can accommodate a 33-tooth 16A double sprocket. S3. Install a first sprocket on the inner wall of the support frame 2. The first sprocket is connected to the double sprocket through a chain. The central axis of the small bevel gear is fixedly connected to the center of the inner side of the first sprocket. The end of the small bevel gear is meshed with the large bevel gear. S4. Pass the drill rod 7 through the large bevel gear, and securely connect the upper end of the drill rod 7 to the pull rope on one of the winches 602. S5. A drill bit is sleeved on the lower part of the drill rod 7. The through hole of the drill bit center collar is a square hole that matches the drill rod 7. The drill bit is fixedly connected to the pull rope on another winch 602. S6. Weld the spiral blade 701 to the bottom of the drill rod 7.

[0039] Example 3, a construction method using a large-caliber mobile agricultural well-drilling device, comprising the following steps: S1. Start the tractor and put the tractor's high and low gears in neutral. Since most small tractors have a seesaw-type control mechanism, you need to depress the clutch, then put the tractor's control handle in reverse gear and release the clutch. At this point, the tractor's reverse gear shaft begins to rotate at high speed, and the tractor's drive wheels have no power output and do not rotate. S2. The double-row chain on the left side of the reverse shaft of the tractor's transmission rotates rapidly, driving the small bevel gear on the drilling rig at the rear of the tractor to rotate at high speed. The large bevel gear forces the square drill rod 7 inside it to rotate at high speed through its square hole and slideway. The drill bit of the drilling rig is driven downward by its own weight and the spiral blades on the drill rod head. S3. After the drill pipe works for 1 - 2 minutes, operate the first limit handle 12 on the winch to engage the displacement gear 18 with the toothed ring on one of the winches 601, and wind the wire rope to lift the drill bit housing 9 and the soil inside along the drill pipe to the ground. During the lifting process, the central drill pipe is not lifted. S4. After braking with the brake band, clean the soil inside, and then slowly release the brake band. Under the action of its own gravity, the drill bit housing 9 slides down along the square drill pipe to the bottom of the drill bit. At this time, operate the tractor gear lever and place it in the reverse gear position. The drill pipe 7 continues to drill downwards and repeat the operation until the well depth meets the requirements. S5. After the well hole is drilled, lower the well pipes in sequence according to the well depth. After the well pipes are lowered, pour a small amount of gravel into the well, and then pump the well water clear with a submersible pump.

[0040] In the above description, the length of the well pipe is about 85 mm. The well pipe is prefabricated with cement and gravel with an outer diameter of 45 mm and an inner diameter of 38 mm, which is convenient for underground spring water to penetrate into the well. In order to facilitate filtering of the sediment at the bottom of the well, after the well pipes are lowered, a small amount of gravel needs to be poured into the well, and then pump the well water clear with a submersible pump.

[0041] In actual operation, using this equipment, 3 - 5 eye wells can be drilled every day, and the gross profit can be about 10,000 yuan.

[0042] The present invention works by switching between two winches through the movement of the displacement gear, which can drive the movement of the drill pipe or the drill bit housing, thereby realizing drilling at different depths. At the same time, it is also convenient for the staff to clean the mud in the drill bit housing, improving the lift of the drilling equipment, meeting various needs of users, being easy to use, simple to operate, and easy to promote.

Claims

1. A large-caliber movable agricultural well-drilling device, comprising a tractor body, a frame (1), a winch (602) and a drill pipe (7), characterized in that: A support frame (2) is provided at the right end of the tractor body. A frame (1) is vertically provided on the support frame (2). Two winches (602) are provided in the middle and lower part of the frame (1). A braking mechanism (6) is provided above the winch (602). Two wire wheels (5) are provided at the top of the frame (1). The wire rope on one of the winches (602) bypasses one of the wire wheels (5) and is connected to the drill bit housing (9). The wire rope on the other winch (602) bypasses the other wire wheel (5) and is connected to the drill pipe (7). The drill bit housing (9) is sleeved on the drill pipe (7). A drill bit driving mechanism (8) is provided in the middle of the drill pipe (7). A spiral blade (7) is provided at the bottom of the drill pipe (7). The drill pipe (1) is a square drill pipe.

2. The large-diameter movable agricultural well drilling device according to claim 1, characterized in that: The frame (1) is composed of an upper frame body (101) and a lower frame body (102). The two ends of the upper frame body (101) are located inside the two ends of the lower frame body (102). The lower end of the upper frame body (101) is rotatably connected to the upper end of the lower frame body (102) and is fixed by bolts (103) outside the lower frame body (102). The wire wheels (5) are located at the top of the upper frame body (101). The braking mechanism (6) is located on the lower frame body (102).

3. A large-caliber movable agricultural well drilling device according to claim 1, characterized in that: A first support rod (3) is provided at the left end of the tractor body. A reinforcing rod (4) is provided between the first support rod (3) and the frame (1), and the right end of the reinforcing rod (4) is fixedly connected to the lower frame body (102).

4. The large-caliber movable agricultural well drilling device according to claim 1, wherein: A third support shaft (601) is provided in the middle and lower part of the frame (1). Two winches (602) are provided on the third support shaft (601), and two wire wheels (5) are provided at positions corresponding to the top of the frame (1). A second support shaft (14) is rotatably connected below the winch (602). A first support shaft (13) is provided below the second support shaft (14), and both ends of the first support shaft (13) are fixedly connected to the inner wall of the frame (1). A displacement gear (18) is slidably connected to the second support shaft (14). A first limit groove (15) is provided below the displacement gear (18), and the first limit groove (15) is slidably connected to the first support shaft (13). An end of the second support shaft (14) is fixedly connected to a triangular belt pulley (191). The triangular belt pulley (191) is located outside the frame (1), and the triangular belt pulley (191) is connected to the tractor engine through a chain. A second support rod (16) is provided at the left end of the first limit groove (15). A second limit groove (17) is provided at the end of the second support rod (16). A bracket (10) is provided on the frame (1) behind the second limit groove (17). A limit post is provided on the bracket (10), and a positioning sleeve (11) is sleeved on the limit post. A first limit handle (12) is provided on the outside of the positioning sleeve (11), and the end of the first limit handle (12) is located on the second limit groove (17).

5. A large-caliber movable agricultural well drilling device according to claim 1, characterized in that: The winch (602) is composed of a disc, a toothed ring and a central shaft. Discs are fixedly connected to both ends of the central shaft, and a toothed ring is sleeved on the outer wall of the inner disc. The central shaft is rotatably connected to the third support shaft (601), and a pull wire is wound around the central shaft.

6. The large-caliber movable agricultural well drilling device according to claim 1, wherein: The braking mechanism is composed of a bearing seat (603), a brake rod (604) and a second limit handle (605). There are two bearing seats (603), which are respectively located on both sides of the frame (1) and above the winch (602). A brake rod (604) is rotatably connected in the bearing seat (603). A second limit handle (605) is provided on the brake rod (604). A brake belt is provided on the second limit handle (605). There are two second limit handles (605), which respectively correspond to the discs at the ends of the two lower winches (602).

7. A large-caliber movable agricultural well-drilling device according to claim 1, characterized in that: The drill bit housing (9) is composed of a central collar, a connecting frame (901), a half shell (902) and a positioning ring (903). The central collar is sleeved on the drill rod (1). Connecting frames (901) are respectively provided on both sides of the central collar. Half shells (902) are respectively provided on both sides of the connecting frame (901). One end of the half shell (902) is hinged to one end of one of the connecting frames (901). A positioning ring (903) is provided at the other end of the half shell (902), and the positioning ring (903) is fixedly connected to the connecting frame (901) through a positioning bolt (904).

8. A large-caliber movable agricultural well drilling device according to claim 1, characterized in that: The drill driving mechanism (8) is composed of a bevel gear set and a sprocket (192), wherein the bevel gear set is composed of a small bevel gear and a large bevel gear. A first sprocket is provided on the inner wall of the support frame (2) and is connected to the tractor engine via a chain. The central axis of the small bevel gear is fixedly connected to the first sprocket. The large bevel gear is meshed and connected to the small bevel gear. A square hole is dug in the center of the large bevel gear. The drill rod (1) passes through the square hole and is slidably connected to the large bevel gear.

9. The manufacturing method of a large-diameter movable agricultural well drilling device according to any one of claims 1-8, characterized in that, The steps include: S1. Prepare the materials needed for construction: 1 small tractor, 3 old steel pipes (6m long), 2 old channel steels (6m long), 2 winches, 1 set of bevel gears, 1 rectangular steel plate, 1 set of turning rods, 2 steel cables, 2 double sprockets, and 1 double chain. S2. Disassemble the gearbox at the rear of the tractor, remove the tractor's reverse gear shaft, and weld a 50mm short shaft to its left end. The short shaft must extend 45mm beyond the gearbox housing. Lathe the shaft so that its end can accommodate a 33-tooth 16A double sprocket. S3, a first sprocket is installed on the inner wall of the support frame (2), the first sprocket is connected to the double sprocket through a chain, the central axis of the small bevel gear is fixedly connected to the center of the inner side of the first sprocket, and the end of the small bevel gear is meshed with a large bevel gear; S4, passing the drill rod (7) through the large bevel gear, and the upper end of the drill rod (7) is fixedly connected to the pull rope on one of the winches (602); S5. A drill bit is sleeved on the lower part of the drill rod (7), and the through hole of the drill bit center collar is a square hole that matches the drill rod (7), and the drill bit is fixedly connected to the pull rope on another winch (602); S6. Welding the spiral blade (701) to the bottom of the drill rod (7).

10. A construction method of a large-diameter movable agricultural well drilling device according to any one of claims 1-8, characterized in that, The steps include: S1. Start the tractor and put the tractor's high and low gears in neutral. Since most small tractors have a seesaw-type control mechanism, you need to depress the clutch, then put the tractor's control handle in reverse gear and release the clutch. At this point, the tractor's reverse gear shaft begins to rotate at high speed, and the tractor's drive wheels have no power output and do not rotate. S2, the double-row chain on the left side of the reverse gear shaft of the tractor gearbox rotates rapidly, and drives the small bevel gear on the drilling rig at the rear of the tractor to rotate at high speed through the double-row chain. The large bevel gear forces the square drill rod (7) inside it to rotate at high speed through its square hole and slideway. The drill bit of the drilling rig digs downwards by its own weight and the spiral blades on the head of the drill rod; S3, after the drill rod has been working for 1-2 minutes, the first limit handle (12) on the winch is operated to engage the displacement gear (18) with the gear ring on one of the winches (601) and the pull line is wound to lift the drill bit housing (9) and the soil inside to the ground along the drill rod. During the lifting process, the center drill rod is not lifted; S4. After braking with the brake band, clean the soil inside, and then slowly release the brake band so that the drill bit housing (9) slides down along the square drill pipe to the bottom of the drill bit under the action of its own gravity. At this time, operate the tractor gear lever and place it in the reverse gear position. The drill pipe (7) continues to drill downwards, and repeat the operation until the well depth meets the requirements; S5. After the well hole is drilled, lower the well pipe successively according to the well depth. After the well pipe is lowered, pour a small amount of gravel into the well, and then pump the well water clear with a submersible pump.

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