A drilling fluid layered sampler with anti-settlement function for oil fields

Abstract

The present invention relates to the technical field of oilfield sampling, and particularly to a drilling fluid layered sampler with anti-settlement function for oilfields. Technical problem: A large amount of sand and gravel in the mud of the drilling fluid obtained by the sampling bucket sinks to the bottom of the sampling bucket under the action of gravity, causing the sample of the obtained drilling fluid to settle and layer, resulting in uneven distribution of the mud in the drilling fluid. Technical solution: A drilling fluid layered sampler with anti-settlement function for oilfields includes a first housing, a second housing, a sampling mechanism, an anti-mud sedimentation mechanism, etc.; the second housing is fixedly connected to the lower surface of the first housing, the first housing is communicated with the second housing, the sampling mechanism is fixedly connected inside the first housing and the second housing, and the anti-mud sedimentation mechanism is fixedly connected inside the sampling mechanism. By setting the anti-mud sedimentation mechanism, the present invention avoids sedimentation of sediment in the drilling fluid sample obtained in the sampling bucket, layering of the drilling fluid sample obtained in the sampling bucket, and sticking of sand and gravel in the drilling fluid sample obtained in the sampling bucket to the wall.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield sampling, and particularly relates to a drilling fluid layered sampler with an anti-settling function for oilfields. Background Art

[0002] Drilling fluid is an essential circulating medium in oilfield drilling construction. After the drilling fluid works underground, it drives the cuttings drilled by the drill bit to the ground. After being screened by a high-frequency vibrating screen, the cuttings and part of the mud in the drilling fluid are screened out. After the screened drilling fluid enters the mud pit, it is mixed with other drilling fluids in the mud pit, and the properties of the mixed drilling fluid change. Since the properties of the drilling fluid affect the drilling speed, it is necessary for the staff to sample and detect the drilling fluid in the mud pit multiple times.

[0003] In the existing rapid sampling devices for oilfield drilling fluid, most are that the staff stands beside the mud pit and holds the rapid sampling device for oilfield drilling fluid to sample the drilling fluid. However, most of the existing rapid sampling devices for oilfield drilling fluid are a simple sampling bucket, which cannot sample the deep drilling fluid in the mud pit, and the sand and gravel in the drilling fluid taken by the sampling bucket sink to the bottom of the sampling bucket under the action of gravity, causing the obtained drilling fluid sample to settle and layer, resulting in uneven distribution of the mud in the drilling fluid and affecting the final test results.

[0004] In view of the deficiencies of the existing technology, we have developed a drilling fluid layered sampler with an anti-settling function for oilfields. Summary of the Invention

[0005] In order to overcome the shortcomings that most of the existing rapid sampling devices for oilfield drilling fluid are a simple sampling bucket, which cannot sample the deep drilling fluid, and the sand and gravel in the mud of the drilling fluid taken by the sampling bucket sink to the bottom of the sampling bucket in large quantities under the action of gravity, causing the obtained drilling fluid sample to settle and layer, resulting in uneven distribution of the mud in the drilling fluid and affecting the final test results, the present invention provides a drilling fluid layered sampler with an anti-settling function for oilfields.

[0006] The technical solution of the present invention is: a drilling fluid layered sampler with an anti-settling function for oilfields, including a first housing, a second housing, a third housing, a sampling mechanism, an anti-mud sedimentation mechanism, and a cleaning mechanism. A sampling port is opened at the front of the first housing, a sampling groove is opened inside the first housing, and the sampling port communicates with the sampling groove. The lower part of the second housing is threadedly connected to the third housing. The sampling mechanism is fixedly connected inside the first housing and the second housing. The sampling mechanism is used for sampling the drilling fluid. The anti-mud sedimentation mechanism is fixedly connected inside the sampling mechanism. The anti-mud sedimentation mechanism is used for preventing the obtained drilling fluid from settling and layering. The cleaning mechanism is fixedly connected inside the first housing. The cleaning mechanism is located above the sampling mechanism. The cleaning mechanism is used for cleaning the sampling groove.

[0007] Furthermore, the sampling mechanism includes a first isolation plate, a plugging barrel, a sampling barrel, a sample outlet pipe, a cross bracket, a second isolation plate, a first servo motor, a rotating plate, an electric push rod, a connecting block, a first concave bracket, a first slider, a sampling isolation door, a second slider, a first spring and a second spring. The first isolation plate is fixedly connected to the lower part of the inner wall of the first housing. The plugging barrel is rotatably connected to the lower part of the first housing. Four sampling through holes and four filtering holes are formed in the plugging barrel. Four sampling barrels are fixedly connected to the lower part of the plugging barrel. The four sampling barrels are arranged circumferentially. Each sampling through hole corresponds to a sampling barrel. The sampling barrel is used for sampling drilling fluid. The sample outlet pipe is fixedly connected to the lower left part of the inner wall of the second housing. The cross bracket is fixedly connected to the lower part of the inner wall of the second housing. A second isolation plate is fixedly connected to the cross bracket. A discharge port is formed in the second isolation plate and is used for discharging materials. A first servo motor is fixedly connected to the second isolation plate. A rotating plate is fixedly connected to the output shaft of the first servo motor. The rotating plate is fixedly connected to the four sampling barrels respectively. An electric push rod is fixedly connected to the first isolation plate. A connecting block is fixedly connected to the front side of the upper end of the telescopic rod of the electric push rod. The first concave bracket is fixedly connected to the upper surface of the first isolation plate. A first slider is slidably connected to the first concave bracket. The connecting block is fixedly connected to the front side of the lower end of the first slider. The sampling isolation door is slidably connected to the sampling port. A second slider is fixedly connected to the rear side of the sampling isolation door. The second slider is slidably connected to the first concave bracket. A first spring is fixedly connected between the first slider and the second slider. A second spring is fixedly connected between the second slider and the first concave bracket. The elastic coefficient of the second spring is greater than that of the first spring.

[0008] Furthermore, the upper end of the sampling isolation door is chamfered to prevent sand and stones in the drilling fluid from hindering the complete closing of the sampling isolation door.

[0009] Furthermore, the anti-mud sedimentation mechanism includes a first cylindrical bracket, a second servo motor, a first gear, a first rotating rod, a second gear, a reciprocating lead screw, a third gear, a vortex fan and an up-and-down anti-sedimentation component. The first cylindrical bracket is fixedly connected between the four sampling barrels. A second servo motor is fixedly connected inside the first cylindrical bracket. A first gear is fixedly connected to the output shaft of the second servo motor. A first rotating rod is rotatably connected inside the sampling barrel. A second gear is fixedly connected to the first rotating rod. The second gear meshes with the first gear. A reciprocating lead screw is rotatably connected inside the sampling barrel. A third gear is fixedly connected to the upper part of the reciprocating lead screw. The third gear meshes with the second gear. A vortex fan is fixedly connected to the lower part of the reciprocating lead screw. The vortex fan is used for stirring the drilling fluid sample taken inside the sampling barrel. The up-and-down anti-sedimentation components are fixedly connected inside the four sampling barrels respectively. The four up-and-down anti-sedimentation components mesh with the first gear respectively. The up-and-down anti-sedimentation components are used for stirring the drilling fluid sample taken inside the sampling barrel up and down.

[0010] Furthermore, the upper and lower anti-settlement components include fixed blocks, limit rods, upper and lower extrusion plates, first toothed plates, second concave brackets, fourth gears, wall-adhering scraping plates, and second toothed plates. Two fixed blocks are fixedly connected inside the sampling bucket, and the two fixed blocks are arranged vertically. The reciprocating lead screw is rotatably connected to the two fixed blocks. Two limit rods are fixedly connected between the two fixed blocks, and the two limit rods are respectively located on both sides of the reciprocating lead screw. The upper and lower extrusion plate is threadedly connected to the reciprocating lead screw and slidably connected to the two limit rods. The upper and lower extrusion plate is used to extrude the drilling fluid sample inside the sampling bucket. Two first toothed plates are fixedly connected to the lower end of the upper and lower extrusion plate. Two second concave brackets are fixedly connected to the lower end of the lower fixed block. Fourth gears are rotatably connected to the two second concave brackets, and the two fourth gears are respectively engaged with the two first toothed plates. A wall-adhering scraping plate is slidably connected inside the sampling bucket, and the wall-adhering scraping plate is used to scrape the sediment adhering to the inner wall of the sampling bucket. Two second toothed plates are fixedly connected to the wall-adhering scraping plate, and the two second toothed plates are respectively engaged with the two fourth gears.

[0011] Furthermore, the cleaning mechanism includes a first circulating water pipe, a water pump, a second circulating water pipe, a first rotating bracket, a fifth gear, an automatic water outlet pipe, a third toothed plate, a fourth toothed plate, and a cleaning and scraping component. The first circulating water pipe is embedded in the first isolation plate. The water pump is fixedly connected to the upper end inside the first housing. The upper end of the first circulating water pipe is communicated with the water inlet end of the water pump. The second circulating water pipe is nested on the first housing. The water outlet end of the water pump is communicated with the second circulating water pipe. The first rotating bracket is located in the sampling groove and is fixedly connected to the first housing. A fifth gear is rotatably connected to the first rotating bracket. The automatic water outlet pipe is slidably connected to the second circulating water pipe. The lower end of the automatic water outlet pipe is provided with a nozzle. There is a cavity on the front side inside the automatic water outlet pipe and a cavity on the rear side inside the automatic water outlet pipe. The cooperation between the second circulating water pipe and the two cavities inside the automatic water outlet pipe is used to control the water outlet. A third toothed plate is fixedly connected to the front side of the automatic water outlet pipe, and the third toothed plate is engaged with the fifth gear. The fourth toothed plate is fixedly connected to the rear end of the second slider, and the fourth toothed plate is engaged with the fifth gear. The cleaning and scraping component is fixedly connected to the lower rear side of the automatic water outlet pipe, and the cleaning and scraping component is used to clean and scrape the sand and stones attached to the inner wall of the sampling groove.

[0012] Furthermore, the cleaning and scraping component includes a right-angle plate bracket and a cleaning frame. The right-angle plate bracket is fixedly connected to the lower rear side of the automatic water outlet pipe, and the cleaning frame is fixedly connected to the lower end of the right-angle plate bracket.

[0013] Furthermore, the lower end of the right-angle plate bracket is provided with a chamfer for cleaning and scraping the sand and stones attached to the inner wall of the sampling groove.

[0014] Further, it further includes a cleaning water anti-blocking mechanism, which includes a second cylindrical bracket, an extrusion block, a third spring, a third slider, a rectangular bracket, a fifth toothed plate, a fixed rod, a sixth gear, a first bevel gear, a second rotating bracket, a second rotating rod, a second bevel gear, a first missing gear, a third rotating rod, a second missing gear, an anti-blocking cleaning plate, a fourth spring and a circulating cleaning plate. The second cylindrical bracket is fixedly connected to the right side of the upper end of the telescopic rod of the electric push rod. The lower part of the second cylindrical bracket is slidably connected with an extrusion block. The extrusion block and the second cylindrical bracket are fixedly connected with a third spring. The lower end of the extrusion block is fixedly connected with a third slider. There are two rectangular brackets, and both of the two rectangular brackets are fixedly connected to the upper surface of the first isolation plate. A fifth toothed plate is slidably connected between the two rectangular brackets. The upper end of the fifth toothed plate is fixedly connected to the right end of the third slider. The left side inner wall of the first housing is rotatably connected with a fixed rod, and a sixth gear is fixedly connected to the fixed rod. The sixth gear meshes with the fifth toothed plate. A first bevel gear is fixedly connected to the fixed rod. The left side inner wall of the first housing is fixedly connected with a second rotating bracket, and a second rotating rod is rotatably connected to the second rotating bracket. The upper end of the second rotating rod is fixedly connected with a second bevel gear, and the lower end of the second rotating rod is fixedly connected with a first missing gear. A third rotating rod is rotatably connected to the first isolation plate. The upper part of the third rotating rod is fixedly connected with a second missing gear. The second missing gear meshes with the first missing gear. Four anti-blocking cleaning plates are circumferentially fixedly connected to the lower part of the third rotating rod. The four anti-blocking cleaning plates are respectively located inside the four filter holes. A fourth spring is fixedly connected between each anti-blocking cleaning plate and the blocking bucket. A circulating cleaning plate is fixedly connected to each anti-blocking cleaning plate. The circulating cleaning plate is used to prevent the sand and stones in the drilling fluid from blocking the filter holes.

[0015] Compared with the prior art, the present invention has the following advantages: By setting the sampling mechanism, the electric push rod is used to drive the sampling isolation door to move up and down, and the first servo motor drives the four sampling buckets and the blocking bucket to rotate, achieving the purpose of sampling multiple times and avoiding inaccurate detection results caused by single sampling; By setting the anti-mud sedimentation mechanism, the second servo motor is used to drive the vortex fan to rotate, stirring the drilling fluid sample taken in the sampling bucket, avoiding the sedimentation of sand and mud in the drilling fluid sample taken in the sampling bucket. The second servo motor is used to drive the upper and lower pressing plates to move up and down, stirring the drilling fluid sample taken in the sampling bucket up and down, avoiding the stratification of the drilling fluid sample taken in the sampling bucket. The upper and lower movement of the upper and lower pressing plates drives the wall-scraping plate to move up and down, scraping the sand and stones in the drilling fluid attached to the inner wall of the sampling bucket, avoiding the sand and stones in the drilling fluid sample taken in the sampling bucket from sticking to the wall; By setting the cleaning mechanism, the electric push rod is used to drive the first rotating bracket to move up and down to clean the sampling groove, avoiding the residual sample of the first sampling from contaminating the samples of the subsequent samplings and affecting the detection results when sampling multiple times; By setting the cleaning water anti-blocking mechanism, the electric push rod is used to drive the four circulating cleaning plates to rotate, achieving the purpose of cleaning the filter holes and avoiding the filter holes being blocked by the sand and stones filtered on the filter holes. Brief Description of the Drawings

[0016] Figure 1 This is a schematic three-dimensional structure diagram of the present invention.

[0017] Figure 2 This is the first cross-sectional view of the three-dimensional structure of the sampling mechanism of the present invention.

[0018] Figure 3 This is the second cross-sectional view of the three-dimensional structure of the sampling mechanism of the present invention.

[0019] Figure 4 This is the third cross-sectional view of the three-dimensional structure of the sampling mechanism of the present invention.

[0020] Figure 5 This is a schematic three-dimensional structure diagram of the sampling mechanism of the present invention.

[0021] Figure 6 This is the fourth cross-sectional view of the three-dimensional structure of the sampling mechanism of the present invention.

[0022] Figure 7 This is the first cross-sectional view of the three-dimensional structure of the anti-mud sedimentation mechanism of the present invention.

[0023] Figure 8 This is the second cross-sectional view of the three-dimensional structure of the anti-mud sedimentation mechanism of the present invention.

[0024] Figure 9 This is an enlarged cross-sectional view of the three-dimensional structure at location A of the present invention.

[0025] Figure 10 This is a cross-sectional view of the three-dimensional structure of the cleaning mechanism of the present invention.

[0026] Figure 11 This is a large view of the three-dimensional structure prevention at location B of the present invention.

[0027] Figure 12 This is a partial cross-sectional view of the three-dimensional structure of the cleaning mechanism of the present invention.

[0028] Figure 13 This is the first cross-sectional view of the three-dimensional structure of the cleaning water anti-blocking mechanism of the present invention.

[0029] Figure 14 This is a schematic partial three-dimensional structure diagram of the cleaning water anti-blocking mechanism of the present invention.

[0030] Figure 15 This is the second cross-sectional view of the three-dimensional structure of the cleaning water anti-blocking mechanism of the present invention.

[0031] Among them, the above-mentioned drawings include the following reference numerals: 101 - the first housing, 1011 - the sampling port, 1012 - the sampling tank, 102 - the second housing, 103 - the third housing, 201 - the first isolation plate, 202 - the plugging barrel, 2021 - the sampling through hole, 2022 - the filtering hole, 203 - the sampling barrel, 204 - the sample outlet pipe, 205 - the cross bracket, 206 - the second isolation plate, 2061 - the discharge port, 207 - the first servo motor, 208 - the rotating plate, 209 - the electric push rod, 210 - the connecting block, 211 - the first concave bracket, 212 - the first slider, 213 - the sampling isolation door, 214 - the second slider, 215 - the first spring, 216 - the second spring, 301 - the first cylindrical bracket, 302 - the second servo motor, 303 - the first gear, 304 - the first rotating rod, 305 - the second gear, 306 - the reciprocating lead screw, 307 - the third gear, 308 - the vortex fan, 309 - the fixed block, 310 - the limiting rod, 311 - the upper and lower pressing plates, 312 - the first toothed plate, 313 - the second concave bracket, 314 - the fourth gear, 315 - the wall - adhering scraping plate, 316 - the second toothed plate, 401 - the first circulating water pipe, 402 - the water pump, 403 - the second circulating water pipe, 404 - the first rotating bracket, 405 - the fifth gear, 406 - the automatic water outlet pipe, 407 - the third toothed plate, 408 - the fourth toothed plate, 409 - the right - angled plate bracket, 410 - the cleaning frame, 501 - the second cylindrical bracket, 502 - the extrusion block, 503 - the third spring, 504 - the third slider, 505 - the rectangular bracket, 506 - the fifth toothed plate, 507 - the fixed rod, 508 - the sixth gear, 509 - the first bevel gear, 510 - the second rotating bracket, 511 - the second rotating rod, 512 - the second bevel gear, 513 - the first missing gear, 514 - the third rotating rod, 515 - the second missing gear, 516 - the anti - blockage cleaning plate, 517 - the fourth spring, 518 - the circulating cleaning plate. Detailed implementation manners

[0032] First of all, it should be pointed out that in different described implementation manners, the same components are provided with the same reference numerals or the same component names. Among them, the disclosed content included in the entire specification can be meaningfully applied to the same components with the same reference numerals or the same component names. The positional descriptions selected in the specification, such as up, down, lateral, etc., also refer to the directly described and illustrated drawings and are meaningfully applied to the new positions when the positions change.

[0033] Embodiment 1

[0034] A drilling fluid layered sampler for oil fields with anti - settlement function, as Figures 1 - 12As shown in the figure, it includes a first housing 101, a second housing 102, a third housing 103, a sampling mechanism, an anti-mud sedimentation mechanism and a cleaning mechanism. A sampling port 1011 is opened at the front of the first housing 101, and a sampling groove 1012 is opened inside the first housing 101. The sampling port 1011 communicates with the sampling groove 1012. The lower part of the second housing 102 is threadedly connected to the third housing 103. The sampling mechanism is fixedly connected inside the first housing 101 and the second housing 102. The sampling mechanism is used for sampling drilling fluid. The anti-mud sedimentation mechanism is fixedly connected inside the sampling mechanism. The anti-mud sedimentation mechanism is used to prevent the obtained drilling fluid from settling and stratifying. The cleaning mechanism is fixedly connected inside the first housing 101. The cleaning mechanism is located above the sampling mechanism. The cleaning mechanism is used to clean the sampling groove 1012.

[0035] When it is necessary to sample the drilling fluid in the mud pit, the staff takes out this device, connects the external device to the upper surface of the first housing 101, puts this device into the mud pit through the external device, places this device to the first detection depth through the external device, and starts the sampling mechanism. The sampling mechanism is used for sampling the drilling fluid in the mud pit. The operation of the sampling mechanism drives the cleaning mechanism to move upward. The cleaning mechanism is used to clean the sampling mechanism to avoid the drilling fluid remaining in the sampling mechanism after the first sampling from contaminating the samples taken subsequently and affecting the test results. During the sampling process, the anti-mud sedimentation mechanism is always working. The anti-mud sedimentation mechanism is used to prevent the obtained drilling fluid from settling and stratifying. When the sampling at the first detection depth is completed, the sampling mechanism is shut down. The sampling mechanism drives the cleaning mechanism to move downward. The cleaning mechanism moves downward to clean the sampling mechanism. The staff places this device to the second detection depth through the external device and repeats the above steps until the sampling is completely completed. The staff takes out this device through the external device, and the sampling is over. The staff removes the third housing 103 from the second housing 102, restarts the sampling mechanism, and takes out the drilling fluid in this device for inspection.

[0036] Embodiment 2

[0037] On the basis of Embodiment 1, as Figures 2 - 12As shown in the figure, the sampling mechanism includes a first isolation plate 201, a plugging barrel 202, a sampling barrel 203, a sample outlet pipe 204, a cross bracket 205, a second isolation plate 206, a first servo motor 207, a rotating plate 208, an electric push rod 209, a connecting block 210, a first concave bracket 211, a first slider 212, a sampling isolation door 213, a second slider 214, a first spring 215 and a second spring 216. The first isolation plate 201 is fixedly connected to the lower part of the inner wall of the first housing 101. The plugging barrel 202 is rotatably connected to the lower part of the first housing 101. Four sampling through holes 2021 and four filtering holes 2022 are formed in the plugging barrel 202. Four sampling barrels 203 are fixedly connected to the lower part of the plugging barrel 202. The four sampling barrels 203 are arranged circumferentially. Each sampling through hole 2021 corresponds to a sampling barrel 203. The sampling barrel 203 is used for sampling drilling fluid. The sample outlet pipe 204 is fixedly connected to the lower left part of the inner wall of the second housing 102. The cross bracket 205 is fixedly connected to the lower part of the inner wall of the second housing 102. A second isolation plate 206 is fixedly connected to the cross bracket 205. A discharge port 2061 is formed in the second isolation plate 206. The discharge port 2061 is used for discharging materials. A first servo motor 207 is fixedly connected to the second isolation plate 206. A rotating plate 208 is fixedly connected to the output shaft of the first servo motor 207. The rotating plate 208 is fixedly connected to the four sampling barrels 203 respectively. An electric push rod 209 is fixedly connected to the first isolation plate 201. A connecting block 210 is fixedly connected to the front side of the upper end of the telescopic rod of the electric push rod 209. The first concave bracket 211 is fixedly connected to the upper surface of the first isolation plate 201. A first slider 212 is slidably connected to the first concave bracket 211. The connecting block 210 is fixedly connected to the front side of the lower end of the first slider 212. The sampling isolation door 213 is slidably connected to the sampling port 1011. A second slider 214 is fixedly connected to the rear side of the sampling isolation door 213. The second slider 214 is slidably connected to the first concave bracket 211. A first spring 215 is fixedly connected between the first slider 212 and the second slider 214. A second spring 216 is fixedly connected between the second slider 214 and the first concave bracket 211. The elastic coefficient of the second spring 216 is greater than that of the first spring 215.

[0038] The upper end of the sampling isolation door 213 is chamfered to prevent sand and stones in the drilling fluid from hindering the complete closing of the sampling isolation door 213.

[0039] The anti-mud sedimentation mechanism includes a first cylindrical support 301, a second servo motor 302, a first gear 303, a first rotating rod 304, a second gear 305, a reciprocating screw rod 306, a third gear 307, a vortex fan 308 and an upper and lower anti-sedimentation assembly. The first cylindrical support 301 is fixedly connected between the four sampling barrels 203. A second servo motor 302 is fixedly connected inside the first cylindrical support 301. A first gear 303 is fixedly connected to the output shaft of the second servo motor 302. A first rotating rod 304 is rotatably connected inside the sampling barrel 203. A second gear 305 is fixedly connected to the first rotating rod 304. The second gear 305 meshes with the first gear 303. A reciprocating screw rod 306 is rotatably connected inside the sampling barrel 203. A third gear 307 is fixedly connected to the upper part of the reciprocating screw rod 306. The third gear 307 meshes with the second gear 305. A vortex fan 308 is fixedly connected to the lower part of the reciprocating screw rod 306. The vortex fan 308 is used to stir the drilling fluid sample taken inside the sampling barrel 203. An upper and lower anti-sedimentation assembly is fixedly connected inside each of the four sampling barrels 203. The four upper and lower anti-sedimentation assemblies are respectively meshed with the first gear 303. The upper and lower anti-sedimentation assembly is used to stir the drilling fluid sample taken inside the sampling barrel 203 up and down.

[0040] The upper and lower anti-sedimentation assembly includes a fixed block 309, a limiting rod 310, an upper and lower extrusion plate 311, a first toothed plate 312, a second concave-shaped support 313, a fourth gear 314, a wall-adhering scraping plate 315 and a second toothed plate 316. Two fixed blocks 309 are fixedly connected inside the sampling barrel 203. The two fixed blocks 309 are arranged up and down. The reciprocating screw rod 306 is rotatably connected to the two fixed blocks 309. Two limiting rods 310 are fixedly connected between the two fixed blocks 309. The two limiting rods 310 are respectively located on both sides of the reciprocating screw rod 306. The reciprocating screw rod 306 is threadedly connected with an upper and lower extrusion plate 311. The upper and lower extrusion plate 311 is slidably connected to the two limiting rods 310. The upper and lower extrusion plate 311 is used to extrude the drilling fluid sample inside the sampling barrel 203. Two first toothed plates 312 are fixedly connected to the lower end of the upper and lower extrusion plate 311. Two second concave-shaped supports 313 are fixedly connected to the lower end of the lower fixed block 309. A fourth gear 314 is rotatably connected to each of the two second concave-shaped supports 313. The two fourth gears 314 are respectively meshed with the two first toothed plates 312. A wall-adhering scraping plate 315 is slidably connected inside the sampling barrel 203. The wall-adhering scraping plate 315 is used to scrape the sediment adhering to the inner wall of the sampling barrel 203. Two second toothed plates 316 are fixedly connected to the wall-adhering scraping plate 315. The two second toothed plates 316 are respectively meshed with the two fourth gears 314.

[0041] The cleaning mechanism includes a first circulating water pipe 401, a water pump 402, a second circulating water pipe 403, a first rotating bracket 404, a fifth gear 405, an automatic water outlet pipe 406, a third toothed plate 407, a fourth toothed plate 408, and a cleaning and scraping component. The first insulating plate 201 is embedded with the first circulating water pipe 401. The water pump 402 is fixedly connected to the upper end inside the first housing 101. The upper end of the first circulating water pipe 401 communicates with the water inlet end of the water pump 402. The second circulating water pipe 403 is nested on the first housing 101. The water outlet end of the water pump 402 communicates with the second circulating water pipe 403. The first rotating bracket 404 is located in the sampling tank 1012. The first rotating bracket 404 is fixedly connected to the first housing 101. A fifth gear 405 is rotatably connected to the first rotating bracket 404. The automatic water outlet pipe 406 is slidably connected to the second circulating water pipe 403. The lower end of the automatic water outlet pipe 406 is provided with a nozzle. There is a cavity on the front side inside the automatic water outlet pipe 406 and a cavity on the rear side inside the automatic water outlet pipe 406. The cooperation between the second circulating water pipe 403 and the two cavities inside the automatic water outlet pipe 406 is used to control the water outlet. The third toothed plate 407 is fixedly connected to the front side of the automatic water outlet pipe 406. The third toothed plate 407 meshes with the fifth gear 405. The fourth toothed plate 408 is fixedly connected to the rear end of the second slider 214. The fourth toothed plate 408 meshes with the fifth gear 405. The cleaning and scraping component is fixedly connected to the lower rear side of the automatic water outlet pipe 406. The cleaning and scraping component is used to clean and scrape the sand and stones attached to the inner wall of the sampling tank 1012.

[0042] The cleaning and scraping component includes a right-angled plate bracket 409 and a cleaning frame 410. The right-angled plate bracket 409 is fixedly connected to the lower rear side of the automatic water outlet pipe 406. The lower end of the right-angled plate bracket 409 is fixedly connected to the cleaning frame 410.

[0043] The lower end of the right-angled plate bracket 409 is provided with a chamfer for cleaning and scraping the sand and stones attached to the inner wall of the sampling tank 1012.

[0044] When it is necessary to sample the drilling fluid in the mud pit, the staff takes out this device, connects the external device to the upper surface of the first housing 101, puts this device into the mud pit through the external device, places this device at the first detection depth through the external device, starts the electric push rod 209, and the telescopic end of the electric push rod 209 drives the connecting block 210 to move downward. The connecting block 210 drives the first slider 212 to move downward. The first slider 212 moves downward and squeezes the first spring 215.

[0045] After being squeezed, the first spring 215 generates an elastic force to squeeze the second slider 214. The second slider 214 is squeezed and moves downward to squeeze the second spring 216. The second spring 216 is squeezed to generate an elastic force. Since the elastic coefficient of the second spring 216 is much larger than that of the first spring 215, the elastic force generated by the second spring 216 is much larger than the elastic force generated by the first spring 215.

[0046] Therefore, during the initial stage of the downward movement of the first slider 212, the second slider 214 will not move downward until the first spring 215 reaches its compression limit. At this time, the second slider 214 begins to move downward, driving the sampling isolation door 213 downward. The downward movement of the sampling isolation door 213 no longer blocks the sampling port 1011, and the drilling fluid flows into a sampling bucket 203 through the sampling port 1011, the sampling tank 1012, and a sampling through-hole 2021. When the lower end of the sampling isolation door 213 is limited by the sampling port 1011 and no longer moves downward, the electric push rod 209 is shut down.

[0047] The second slider 214 drives the fourth toothed plate 408 downward. The downward movement of the fourth toothed plate 408 drives the fifth gear 405 to rotate counterclockwise. The counterclockwise rotation of the fifth gear 405 drives the third toothed plate 407 upward. The third toothed plate 407 drives the automatic water outlet pipe 406 upward. The upward movement of the automatic water outlet pipe 406 blocks the second circulation water pipe 403. The automatic water outlet pipe 406 drives the right-angle plate bracket 409 upward. The right-angle plate bracket 409 drives the cleaning frame 410 upward.

[0048] When there is enough drilling fluid sample in the sampling bucket 203, the electric push rod 209 is started. The telescopic end of the electric push rod 209 drives the connecting block 210 upward. The connecting block 210 drives the first slider 212 upward. The upward movement of the first slider 212 reduces the extrusion of the first spring 215. The first spring 215 reduces the extrusion of the second slider 214. The second slider 214 reduces the extrusion of the second spring 216. Since the elastic coefficient of the second spring 216 is much larger than that of the first spring 215, the elastic force generated by the second spring 216 is much larger than the elastic force generated by the first spring 215.

[0049] Therefore, during the above process, the second slider 214 moves upward first. The second slider 214 drives the sampling isolation door 213 upward. The upward movement of the sampling isolation door 213 re-blocks the sampling port 1011. The second slider 214 drives the fourth toothed plate 408 upward. The upward movement of the fourth toothed plate 408 drives the fifth gear 405 to rotate clockwise. The clockwise rotation of the fifth gear 405 drives the third toothed plate 407 downward. The third toothed plate 407 drives the automatic water outlet pipe 406 downward. The downward movement of the automatic water outlet pipe 406 no longer blocks the second circulation water pipe 403. The water flows into the sampling tank 1012 through the second circulation water pipe 403 and is filtered through the filter holes 2022. At this time, the water pump 402 is started and flows back into the second circulation water pipe 403 through the first circulation water pipe 401. The automatic water outlet pipe 406 drives the right-angle plate bracket 409 downward. The right-angle plate bracket 409 drives the cleaning frame 410 downward. The downward movement of the cleaning frame 410 scrapes the sand and stones attached to the inner wall of the sampling tank 1012.

[0050] Until the external drilling fluid no longer enters the device, the first slider 212 moves upward and resets to the initial state. Turn off the water pump 402, start the first servo motor 207. The output shaft of the first servo motor 207 drives the rotating plate 208 to rotate clockwise by forty-five degrees. The rotating plate 208 drives the four sampling buckets 203 and the blocking bucket 202 to rotate clockwise by forty-five degrees. The blocking bucket 202 rotates clockwise by forty-five degrees to connect a filtering hole 2022 with the sampling groove 1012. The staff places the device to the second detection depth through an external device and repeats the above steps until the sampling is completely completed. The staff takes out the device through the external device, and the sampling ends. The staff removes the third housing 103 from the second housing 102, restarts the first servo motor 207. The output shaft of the first servo motor 207 drives the rotating plate 208 to rotate clockwise. The rotating plate 208 drives the four sampling buckets 203 and the blocking bucket 202 to rotate clockwise until the first sampling bucket 203 that has completed sampling coincides with the discharge port 2061. Then turn off the first servo motor 207. The drilling fluid sample in the first sampling bucket 203 that has completed sampling flows out through the discharge port 2061 and the sample outlet pipe 204. The staff collects it and repeats the above steps until all the drilling fluid in the device is taken out and then sent for inspection.

[0051] During the above process, the second servo motor 302 is always in the working state. The output shaft of the second servo motor 302 drives the first gear 303 to rotate clockwise. The first gear 303 drives the second gear 305 to rotate counterclockwise. The second gear 305 drives the third gear 307 to rotate clockwise. The third gear 307 drives the reciprocating lead screw 306 to rotate clockwise. The reciprocating lead screw 306 drives the vortex fan 308 to rotate clockwise. The vortex fan 308 rotates clockwise to stir the drilling fluid sample taken in the sampling bucket 203. After the drilling fluid sample is stirred, the sand and stones in the drilling fluid, under the action of centrifugal force, adhere to the inner wall of the sampling bucket 203 and suspend in the drilling fluid. When the reciprocating lead screw 306 rotates clockwise, it drives the upper and lower pressing plates 311 to move downward through thread cooperation. The upper and lower pressing plates 311 move downward to squeeze the drilling fluid sample taken in the sampling bucket 203. The drilling fluid sample taken in the sampling bucket 203 is squeezed and moves upward to the upper surface of the upper and lower pressing plates 311. The upper and lower pressing plates 311 drive the two first toothed plates 312 to move downward. The two first toothed plates 312 move downward to drive the two fourth gears 314 to rotate counterclockwise. The two fourth gears 314 rotate counterclockwise to drive the two second toothed plates 316 to move upward. The two second toothed plates 316 drive the wall scraping plate 315 to move upward. The wall scraping plate 315 moves upward to scrape the sand and stones in the drilling fluid adhering to the inner wall of the sampling bucket 203. When the upper and lower pressing plates 311 move downward to be limited by the upper surface of the lower fixed block 309, they move upward under the action of the reciprocating lead screw 306.

[0052] The upper and lower extrusion plates 311 move upward to lift the drilling fluid sample on their upper surfaces, stirring the drilling fluid sample taken in the sampling bucket 203 up and down to prevent the drilling fluid sample taken in the sampling bucket 203 from stratifying. The upper and lower extrusion plates 311 drive the two first toothed plates 312 to move upward. The upward movement of the two first toothed plates 312 drives the two fourth gears 314 to rotate clockwise. The clockwise rotation of the two fourth gears 314 drives the two second toothed plates 316 to move downward. The two second toothed plates 316 drive the wall-adhering scraping plate 315 to move downward. The downward movement of the wall-adhering scraping plate 315 scrapes the sand and gravel in the drilling fluid adhering to the inner wall of the lower end sampling bucket 203, so that the sand and gravel in the drilling fluid sample taken in the sampling bucket 203 are always in the middle position of the sampling bucket 203 and are stirred by the vortex fan 308.

[0053] Example 3

[0054] On the basis of Example 2, as Figures 13 - 15As shown in the figure, it further includes a cleaning water anti-blocking mechanism, which includes a second cylindrical bracket 501, a pressing block 502, a third spring 503, a third slider 504, a rectangular bracket 505, a fifth toothed plate 506, a fixing rod 507, a sixth gear 508, a first bevel gear 509, a second rotating bracket 510, a second rotating rod 511, a second bevel gear 512, a first missing gear 513, a third rotating rod 514, a second missing gear 515, an anti-blocking cleaning plate 516, a fourth spring 517 and a circulating cleaning plate 518. The second cylindrical bracket 501 is fixedly connected to the right side of the upper end of the telescopic rod of the electric push rod 209. The lower part of the second cylindrical bracket 501 is slidably connected with a pressing block 502. The pressing block 502 and the second cylindrical bracket 501 are fixedly connected with a third spring 503. The lower end of the pressing block 502 is fixedly connected with a third slider 504. There are two rectangular brackets 505, and both of the two rectangular brackets 505 are fixedly connected to the upper surface of the first isolation plate 201. A fifth toothed plate 506 is slidably connected between the two rectangular brackets 505. The upper end of the fifth toothed plate 506 is fixedly connected to the right end of the third slider 504. The left side inner wall of the first housing 101 is rotatably connected with a fixing rod 507, and a sixth gear 508 is fixedly connected to the fixing rod 507. The sixth gear 508 meshes with the fifth toothed plate 506. A first bevel gear 509 is fixedly connected to the fixing rod 507. The left side inner wall of the first housing 101 is fixedly connected with a second rotating bracket 510. A second rotating rod 511 is rotatably connected to the second rotating bracket 510. The upper end of the second rotating rod 511 is fixedly connected with a second bevel gear 512, and the lower end of the second rotating rod 511 is fixedly connected with a first missing gear 513. A third rotating rod 514 is rotatably connected to the first isolation plate 201. A second missing gear 515 is fixedly connected to the upper part of the third rotating rod 514. The second missing gear 515 meshes with the first missing gear 513. Four anti-blocking cleaning plates 516 are circumferentially fixedly connected to the lower part of the third rotating rod 514. The four anti-blocking cleaning plates 516 are respectively located inside the four filtering holes 2022. A fourth spring 517 is fixedly connected between each anti-blocking cleaning plate 516 and the blocking bucket 202. A circulating cleaning plate 518 is fixedly connected to each anti-blocking cleaning plate 516. The circulating cleaning plate 518 is used to prevent the sand and stones in the drilling fluid from blocking the filtering holes 2022.

[0055] During sampling, the telescopic end of the electric push rod 209 drives the second cylinder bracket 501 to move downward. The second cylinder bracket 501 drives the third spring 503 to move downward. The third spring 503 squeezes the extrusion block 502 to move downward. The extrusion block 502 drives the third slider 504 to move downward. The third slider 504 drives the fifth toothed plate 506 to move downward. The downward movement of the fifth toothed plate 506 drives the sixth gear 508 to rotate counterclockwise. The sixth gear 508 drives the fixed rod 507 to rotate counterclockwise. The fixed rod 507 drives the first bevel gear 509 to rotate counterclockwise. The counterclockwise rotation of the first bevel gear 509 drives the second bevel gear 512 to rotate clockwise. The second bevel gear 512 drives the second rotating rod 511 to rotate clockwise. The second rotating rod 511 drives the first missing gear 513 to rotate clockwise. The first missing gear 513 drives the second missing gear 515 to rotate counterclockwise. The second missing gear 515 drives the third rotating rod 514 to rotate counterclockwise. The third rotating rod 514 drives the four anti-blocking cleaning plates 516 to rotate counterclockwise. The four anti-blocking cleaning plates 516 drive the four circulating cleaning plates 518 to rotate counterclockwise. The counterclockwise rotation of the four circulating cleaning plates 518 is used to clean the sand and gravel filtered out on the four filter holes 2022. The four anti-blocking cleaning plates 516 rotating counterclockwise squeeze the four fourth springs 517. The four fourth springs 517 generate opposite acting forces when being squeezed. When the first missing gear 513 is no longer engaged with the second missing gear 515, at this time, under the action of the four fourth springs 517, the four anti-blocking cleaning plates 516 drive the four circulating cleaning plates 518 to rotate clockwise to reset.

[0056] Those skilled in the art should understand that the above embodiments do not limit the present invention in any form. Any technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A drilling fluid layered sampler with anti-settling function for oil fields, comprising a first housing (101), a second housing (102), and a third housing (103), characterized in that: It also includes a sampling mechanism, an anti-mud sedimentation mechanism, and a cleaning mechanism. A sampling port (1011) is provided at the front of the first housing (101), and a sampling groove (1012) is provided inside the first housing (101). The sampling port (1011) communicates with the sampling groove (1012). The lower part of the second housing (102) is threadedly connected to the third housing (103). The sampling mechanism is fixedly connected inside the first housing (101) and the second housing (102). The sampling mechanism is used for sampling drilling fluid. The anti-mud sedimentation mechanism is fixedly connected inside the sampling mechanism. The anti-mud sedimentation mechanism is used to prevent the obtained drilling fluid from settling and stratifying. The cleaning mechanism is fixedly connected inside the first housing (101). The cleaning mechanism is located above the sampling mechanism. The cleaning mechanism is used to clean the sampling groove (1012); The sampling mechanism includes a first isolation plate (201), a plugging barrel (202), a sampling barrel (203), a sample outlet pipe (204), a cross bracket (205), a second isolation plate (206), a first servo motor (207), a rotating plate (208), an electric push rod (209), a connecting block (210), a first concave bracket (211), a first slider (212), a sampling isolation door (213), a second slider (214), a first spring (215) and a second spring (216). The first isolation plate (201) is fixedly connected to the lower part of the inner wall of the first housing (101). The plugging barrel (202) is rotatably connected to the lower part of the first housing (101). Four sampling through holes (2021) and four filtering holes (2022) are formed in the plugging barrel (202). Four sampling barrels (203) are fixedly connected to the lower part of the plugging barrel (202). The four sampling barrels (203) are arranged circumferentially. Each sampling through hole (2021) corresponds to a sampling barrel (203). The sampling barrel (203) is used for sampling drilling fluid. The sample outlet pipe (204) is fixedly connected to the lower left part of the inner wall of the second housing (102). The cross bracket (205) is fixedly connected to the lower part of the inner wall of the second housing (102). A second isolation plate (206) is fixedly connected to the cross bracket (205). A discharge port (2061) is formed in the second isolation plate (206). The discharge port (2061) is used for discharging materials. A first servo motor (207) is fixedly connected to the second isolation plate (206). A rotating plate (208) is fixedly connected to the output shaft of the first servo motor (207). The rotating plate (208) is fixedly connected to the four sampling barrels (203) respectively. An electric push rod (209) is fixedly connected to the first isolation plate (201). A connecting block (210) is fixedly connected to the front side of the upper end of the telescopic rod of the electric push rod (209). The first concave bracket (211) is fixedly connected to the upper surface of the first isolation plate (201). A first slider (212) is slidably connected to the first concave bracket (211). The connecting block (210) is fixedly connected to the front side of the lower end of the first slider (212). The sampling isolation door (213) is slidably connected to the sampling port (1011). A second slider (214) is fixedly connected to the rear side of the sampling isolation door (213). The second slider (214) is slidably connected to the first concave bracket (211). A first spring (215) is fixedly connected between the first slider (212) and the second slider (214). A second spring (216) is fixedly connected between the second slider (214) and the first concave bracket (211). The elastic coefficient of the second spring (216) is greater than that of the first spring (215); The anti-sludge settlement mechanism includes a first cylindrical bracket (301), a second servo motor (302), a first gear (303), a first rotating rod (304), a second gear (305), a reciprocating lead screw (306), a third gear (307), a vortex fan (308) and an upper and lower anti-settlement assembly. The first cylindrical bracket (301) is fixedly connected between four sampling buckets (203). A second servo motor (302) is fixedly connected inside the first cylindrical bracket (301). A first gear (303) is fixedly connected to the output shaft of the second servo motor (302). A first rotating rod (304) is rotatably connected inside the sampling bucket (203). A second gear (305) is fixedly connected to the first rotating rod (304). The second gear (305) meshes with the first gear (303). A reciprocating lead screw (306) is rotatably connected inside the sampling bucket (203). A third gear (307) is fixedly connected to the upper part of the reciprocating lead screw (306). The third gear (307) meshes with the second gear (305). A vortex fan (308) is fixedly connected to the lower part of the reciprocating lead screw (306). The vortex fan (308) is used to stir the drilling fluid sample taken inside the sampling bucket (203). An upper and lower anti-settlement assembly is fixedly connected inside each of the four sampling buckets (203). The four upper and lower anti-settlement assemblies are respectively meshed with the first gear (303). The upper and lower anti-settlement assembly is used to stir the drilling fluid sample taken inside the sampling bucket (203) up and down.

2. The drilling fluid layered sampler with anti-settling function for oil fields according to claim 1, characterized in that: The upper end of the sampling isolation door (213) is chamfered to prevent the sand and stones in the drilling fluid from hindering the complete closing of the sampling isolation door (213).

3. The drilling fluid layered sampler with anti-settling function for oil fields according to claim 1, characterized in that: The up-and-down anti-settlement assembly includes a fixed block (309), a limiting rod (310), an up-and-down extrusion plate (311), a first toothed plate (312), a second concave bracket (313), a fourth gear (314), a wall-adhering scraping plate (315) and a second toothed plate (316). Two fixed blocks (309) are fixedly connected inside the sampling bucket (203). The two fixed blocks (309) are arranged vertically. The reciprocating lead screw (306) is rotatably connected to the two fixed blocks (309). Two limiting rods (310) are fixedly connected between the two fixed blocks (309). The two limiting rods (310) are respectively located on both sides of the reciprocating lead screw (306). The up-and-down extrusion plate (311) is threadedly connected to the reciprocating lead screw (306). The up-and-down extrusion plate (311) is slidably connected to the two limiting rods (310). The up-and-down extrusion plate (311) is used to extrude the drilling fluid sample inside the sampling bucket (203). Two first toothed plates (312) are fixedly connected to the lower end of the up-and-down extrusion plate (311). Two second concave brackets (313) are fixedly connected to the lower end of the lower fixed block (309). A fourth gear (314) is rotatably connected to each of the two second concave brackets (313). The two fourth gears (314) are respectively meshed with the two first toothed plates (312). A wall-adhering scraping plate (315) is slidably connected inside the sampling bucket (203). The wall-adhering scraping plate (315) is used to scrape the sediment adhering to the inner wall of the sampling bucket (203). Two second toothed plates (316) are fixedly connected to the wall-adhering scraping plate (315). The two second toothed plates (316) are respectively meshed with the two fourth gears (314).

4. The drilling fluid layered sampler with anti-settling function for oil fields according to claim 1, characterized in that: The cleaning mechanism includes a first circulating water pipe (401), a water pump (402), a second circulating water pipe (403), a first rotating bracket (404), a fifth gear (405), an automatic water outlet pipe (406), a third toothed plate (407), a fourth toothed plate (408) and a cleaning and scraping component. The first isolating plate (201) is embedded with the first circulating water pipe (401). The water pump (402) is fixedly connected to the upper end inside the first housing (101). The upper end of the first circulating water pipe (401) is communicated with the water inlet end of the water pump (402). The second circulating water pipe (403) is nested on the first housing (101). The water outlet end of the water pump (402) is communicated with the second circulating water pipe (403). The first rotating bracket (404) is located in the sampling tank (1012). The first rotating bracket (404) is fixedly connected to the first housing (101). A fifth gear (405) is rotatably connected to the first rotating bracket (404). The automatic water outlet pipe (406) is slidably connected to the second circulating water pipe (403). The lower end of the automatic water outlet pipe (406) is provided with a nozzle. There is a cavity on the front side inside the automatic water outlet pipe (406) and a cavity on the rear side inside the automatic water outlet pipe (406). The two cavities inside the second circulating water pipe (403) and the automatic water outlet pipe (406) cooperate to control the water outlet. The third toothed plate (407) is fixedly connected to the front side of the automatic water outlet pipe (406). The third toothed plate (407) meshes with the fifth gear (405). The fourth toothed plate (408) is fixedly connected to the rear end of the second slider (214). The fourth toothed plate (408) meshes with the fifth gear (405). The cleaning and scraping component is fixedly connected to the lower rear side of the automatic water outlet pipe (406). The cleaning and scraping component is used to clean and scrape the sand and stones attached to the inner wall of the sampling tank (1012).

5. The drilling fluid layered sampler with anti-settling function for oil fields according to claim 4, characterized in that: The cleaning and scraping component includes a right-angle plate bracket (409) and a cleaning frame (410). The right-angle plate bracket (409) is fixedly connected to the lower rear side of the automatic water outlet pipe (406). The lower end of the right-angle plate bracket (409) is fixedly connected to the cleaning frame (410).

6. The drilling fluid layered sampler with anti-settling function for oil fields according to claim 5, characterized in that: The lower end of the right-angle plate bracket (409) is provided with a chamfer for cleaning and scraping the sand and stones attached to the inner wall of the sampling tank (1012).

7. The drilling fluid layered sampler with anti-settling function for oil fields according to claim 1, characterized in that: It further includes a water cleaning and anti-blocking mechanism, which includes a second cylindrical bracket (501), a pressing block (502), a third spring (503), a third slider (504), a rectangular bracket (505), a fifth toothed plate (506), a fixed rod (507), a sixth gear (508), a first bevel gear (509), a second rotating bracket (510), a second rotating rod (511), a second bevel gear (512), a first partial gear (513), a third rotating rod (514), a second partial gear (515), an anti-blocking cleaning plate (516), a fourth spring (517) and a circulating cleaning plate (518). The second cylindrical bracket (501) is fixedly connected to the right side of the upper end of the telescopic rod of the electric push rod (209). A pressing block (502) is slidably connected to the lower part of the second cylindrical bracket (501). The pressing block (502) and the second cylindrical bracket (501) are fixedly connected with a third spring (503). The lower end of the pressing block (502) is fixedly connected with a third slider (504). There are two rectangular brackets (505), and both of the two rectangular brackets (505) are fixedly connected to the upper surface of the first isolation plate (201). A fifth toothed plate (506) is slidably connected between the two rectangular brackets (505). The upper end of the fifth toothed plate (506) is fixedly connected to the right end of the third slider (504). The left side inner wall of the first housing (101) is rotatably connected with a fixed rod (507). A sixth gear (508) is fixedly connected to the fixed rod (507). The sixth gear (508) meshes with the fifth toothed plate (506). A first bevel gear (509) is fixedly connected to the fixed rod (507). The second rotating bracket (510) is fixedly connected to the left side inner wall of the first housing (101). A second rotating rod (511) is rotatably connected to the second rotating bracket (510). The upper end of the second rotating rod (511) is fixedly connected with a second bevel gear (512). The lower end of the second rotating rod (511) is fixedly connected with a first partial gear (513). A third rotating rod (514) is rotatably connected to the first isolation plate (201). A second partial gear (515) is fixedly connected to the upper part of the third rotating rod (514). The second partial gear (515) meshes with the first partial gear (513). Four anti-blocking cleaning plates (516) are circumferentially fixedly connected to the lower part of the third rotating rod (514). The four anti-blocking cleaning plates (516) are respectively located inside the four filter holes (2022). A fourth spring (517) is fixedly connected between each anti-blocking cleaning plate (516) and the blocking bucket (202). A circulating cleaning plate (518) is fixedly connected to each anti-blocking cleaning plate (516). The circulating cleaning plate (518) is used to prevent the sand and stones in the drilling fluid from blocking the filter holes (2022).

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