Sand filtering device for geological drilling

Abstract

The utility model relates to the field of sand filtering, in particular to a sand filtering device for geological drilling, which comprises a main bin, a filtering bin, a piston mechanism, a one-way water inlet mechanism, a driving mechanism and a pressure sensing mechanism. The piston mechanism is slidably installed in the filter bin and is in sealed connection with the inner wall of the filter bin, the one-way water inlet mechanism is installed on the piston mechanism, the driving mechanism is fixedly installed in the filter bin and is in transmission connection with the piston mechanism, and the pressure sensing mechanism is installed at the end, away from the water inlet, of the filter bin. According to the filtering device, mud and sand in flushing liquid can be filtered in an active pressure applying mode, the flushing liquid can be pressed to be actively filtered under the condition that the mesh number of the filtering holes is set to be small, mud and sand particles wrapped by the flushing liquid can be better filtered out, and the filtering effect is improved.

Description

Technical Field

[0001] The utility model relates to the field of sand filtration, in particular to a sand filtration device for geological drilling. Background Technique

[0002] The sand filtration device in geological drilling is mainly used to filter and remove sand grains and other solid particles in the flushing fluid during the drilling process. During the drilling process, the flushing fluid will carry the cuttings cut by the drill bit. If the flushing fluid contains too many sand grains or other solid particles, it will cause wear to the drilling equipment (such as the flushing fluid pump, drill bit, drill pipe, etc.). The sand filtration device can remove these solid particles, thereby protecting the equipment and extending its service life.

[0003] At present, the Chinese utility model patent application with the publication number CN209586303U and the publication date of November 5, 2019, proposed a sand filtration device for bored piles, including: a sand filtration chamber, an inlet and an outlet are arranged on the sand filtration chamber, a conical hopper is installed at the lower end of the sand filtration chamber, a cover plate is welded at the lower end of the conical hopper, a sand storage chamber is installed on the lower end surface of the cover plate through bolts, a sand discharge pipe is welded at the middle position of the lower end surface of the sand storage chamber, a carrier plate is fixed on the right side of the circumferential side of the sand storage chamber, a hand-operated blower is installed on the upper end surface of the carrier plate, an air inlet pipe is installed on the upper end surface of the cover plate, and the upper end of the air inlet pipe is connected to the hand-operated blower through a connecting pipe.

[0004] During use, the sand and gravel can be separated in the sand filtration chamber through sedimentation, and the separated sand and gravel are stored in the sand storage chamber. The sand storage chamber can be purged by the blower to discharge the sand and gravel in the sand storage chamber from the sand discharge pipe.

[0005] In view of the above related technologies, the sand and gravel are separated from the muddy water through sedimentation. When separating the sand and gravel from the flushing fluid used for drilling, due to the large density and viscosity of the flushing fluid, it will play a certain coating role on the sand and gravel. When the flushing fluid and the sand and gravel are sedimented and separated under the action of gravity, it is easy to cause a poor filtration effect on the sand and gravel coated with the flushing fluid. Content of the Utility Model

[0006] In order to improve the filtration effect of the sand and gravel in the flushing fluid without changing the density and viscosity of the flushing fluid used for drilling, the utility model provides a sand filtration device for geological drilling.

[0007] The utility model provides a sand filtration device for geological drilling, adopting the following technical scheme:

[0008] A sand filtering device for geological drilling, comprising a filtering chamber, a piston mechanism, a driving mechanism, and a main chamber; a water outlet is arranged on the main chamber, a water inlet is arranged at one end of the filtering chamber, a plurality of filter holes are arranged on the side wall of the filtering chamber, the main chamber is sleeved outside the filtering chamber, and a sealed setting is arranged between the main chamber and the filtering chamber; the piston mechanism includes a piston and a connecting part, the connecting part is fixedly connected with the piston, the piston is slidably arranged inside the filtering chamber, a sealed connection is arranged between the outer peripheral surface of the piston and the inner wall of the filtering chamber, a one-way water inlet mechanism is arranged on the piston, and the one-way water inlet mechanism allows the fluid to flow inside the filtering chamber from the water inlet to the direction away from the water inlet; the driving mechanism is fixedly installed inside the filtering chamber, and the output shaft of the driving mechanism is in transmission connection with the connecting part.

[0009] By adopting this technical solution, the flushing liquid enters the filtering chamber from the water inlet, and under the action of the piston mechanism, the flushing liquid is squeezed from the filter holes on the side wall of the filtering chamber into the main chamber, and finally discharged from the water outlet in the main chamber. During this process, the flushing liquid flows out from the filter holes under the extrusion of the piston mechanism, while the sand and gravel will be blocked inside the filter holes. The thickness of the piston will cause the piston to block the filter holes opposite to the moving direction one by one during the moving process, which can prevent the filtered flushing liquid from flowing back. In this way, the sand and gravel in the flushing liquid are filtered by the active pressure of the piston mechanism, ensuring that the flushing liquid can pass through the filter holes even when the filter holes are small, and separating the sand and gravel coated in the flushing liquid as much as possible without changing the density and viscosity of the flushing liquid as much as possible, reducing the sand and gravel content in the flushing liquid, and effectively improving the filtering effect.

[0010] Optionally, the one-way water inlet mechanism includes a sealing member and a connecting member, a water inlet hole is arranged on the piston, the connecting member is installed on the end face of the piston far away from the connecting part, the connecting member is arranged on one side of the water inlet hole, one end of the sealing member is rotatably connected to the connecting member, and the sealing member is correspondingly arranged with the water inlet hole.

[0011] By adopting this technical solution, when the piston moves towards the water inlet direction, the flushing liquid pushes open the sealing member arranged on the water inlet hole, and the flushing liquid passes through the water inlet hole; when the piston moves towards the direction away from the water inlet, the flushing liquid presses on the side of the sealing member away from the water inlet hole, and presses the sealing member in the water inlet hole to prevent the flushing liquid from passing through the water inlet hole, achieving the effect of one-way water inlet. In this way, the pressure of the flushing liquid itself is used to press the sealing member on the water inlet hole, so that the flushing liquid can only pass through the water inlet hole and flow from the water inlet end to the end away from the water inlet, continuously sending the flushing liquid into the filtering chamber for filtering.

[0012] Optionally, an elastic member is further disposed between the seal and the connecting member. One end of the elastic member is connected to the seal, and the other end is connected to the connecting member. The elastic member has a tendency to cover the seal on the water inlet hole.

[0013] By adopting this technical solution, the seal will be actively pressed on the surface of the water inlet hole under the action of the elastic member. When the piston moves to the side away from the water inlet, the seal can quickly seal the water inlet hole, reducing the probability of the flushing liquid leaking from the water inlet hole and improving the filtration efficiency.

[0014] Optionally, an arc portion is further provided on the end surface of the seal close to the water inlet hole. The arc portion is a flexible structure and corresponds to the position of the water inlet hole.

[0015] By adopting this technical solution, the arc portion on the seal will squeeze part of the structure into the water inlet hole under the extrusion of the seal, sealing the water inlet hole more tightly, reducing the leakage amount of the flushing liquid from the water inlet hole when the piston actively compresses the flushing liquid to separate the sand and gravel, and improving the filtration efficiency.

[0016] Optionally, a mud scraping plate is fixedly arranged on the piston. The outer peripheral surface of the mud scraping plate contacts the inner wall of the filter chamber, and the mud scraping plate is made of a flexible material.

[0017] By adopting this technical solution, when the mud scraping plate moves linearly with the piston inside the filter chamber, the mud scraping plate can scrape off the mud attached to the inner wall of the filter chamber and the sand and gravel attached to the filter holes, reducing the blockage of the filter holes by the sand and gravel and improving the filtration efficiency; the mud scraping plate can also reduce the friction of the sand and gravel on the piston and improve the service life of the piston; at the same time, the mud scraping plate and the one-way water inlet mechanism can cooperate to continuously transport the mud and sand to the end far from the water inlet, accumulating the mud and sand on one side for convenient subsequent unified treatment of the accumulated mud and sand.

[0018] Optionally, a sand discharge port is arranged at the end of the filter chamber far from the water inlet, and a sealing cover is installed on the sand discharge port.

[0019] By adopting this technical solution, during the operation of the sand filtering device, part of the mud and sand can be accumulated at the end far from the water inlet through the one-way water inlet mechanism. After the sand filtering device works for a period of time, the sand discharge port is opened, and the accumulated mud and sand can be discharged from the sand discharge port, reducing the accumulation of mud and sand in the sand filtering device and improving the sand filtering efficiency.

[0020] Optionally, a pressure sensing mechanism is provided on the sealing cover. The pressure sensing mechanism includes a pressure sensing member, an indicating member, and an elastic member. A through hole is provided on the sealing cover. The pressure sensing member is sealingly arranged on the through hole. The indicating member is arranged at one end of the pressure sensing member away from the filter chamber. The indicating member penetrates through the through hole. The pressure sensing member is of an elastic structure. Two ends of the elastic member are respectively connected to the indicating member and the sealing cover.

[0021] By adopting such a technical solution, when a large amount of sediment accumulates on the sealing cover, it will adhere to the surfaces of the sealing cover and the pressure sensing member. When the piston moves towards the sealing cover, the pressure sensing member will be extruded by the sediment. After the pressure part is pressed, it will drive the indicating member to move away from the piston. Subsequently, when the piston moves back, the pressure sensing member will return to its original position under the action of the elastic member. As more and more sediment accumulates on one side of the pressure sensing member, when the piston moves to the end towards the sealing cover, the effective cavity between the piston and the sealing cover will become smaller and smaller (the effective cavity refers to the cavity in the chamber that can be used for the flushing liquid to flow. Here, since the sediment occupies a certain space, the space occupied by the flushing liquid will decrease, that is, the effective cavity decreases). And the liquid flow rate pumped by the piston each time is the same. According to the flow equation, Bernoulli's principle, and the relationship between pressure and force, it can be known that when the effective cavity between the piston and the sealing cover becomes smaller, the pressure between the piston and the sealing cover will become larger. And the liquid has the characteristic of isotropic pressure. Therefore, when the area of the pressure sensing member remains unchanged, the pressure received by the pressure sensing member will become larger, that is, the more sediment accumulates on one side of the sealing cover, the greater the pressure received by the pressure sensing member, and the more the indicating member connected to the pressure sensing member will move away from the piston. In this way, by observing the indicating member outside the sealing cover, the amount of sediment accumulation inside the filter chamber can be judged, and the sealing cover can be opened in time to discharge the sediment according to the indicating member, providing a basis for when to discharge the sediment.

[0022] Optionally, a limiting ring is further provided at one end of the through hole away from the filter chamber. The indicating member includes an identification part and a limiting part. The identification part is connected to one end of the limiting part away from the filter chamber. Two ends of the elastic member respectively abut between the limiting part and the limiting ring.

[0023] By adopting such a technical solution, the cooperation of the limiting ring and the limiting part can also prevent the indicating member from moving too far and falling off the sealing cover when the indicating member moves. At the same time, the installation of the limiting ring and the limiting part also facilitates the installation of the elastic member.

[0024] Optionally, a position sensor is further provided on the sealing cover. The position sensor is arranged corresponding to the indicating member. The position sensor is electrically connected to the driving mechanism.

[0025] By adopting this technical solution, the position sensor can monitor the position of the indicating member in real time, and automatically cut off the power supply of the driving structure after the indicating member moves beyond the set range, reducing the risk of motor burnout caused by the continuous operation of the driving mechanism after the sediment is pushed and filled.

[0026] Optionally, the driving mechanism includes a motor, a turntable and a rocker arm. A waterproof chamber is also connected to one side of the filter chamber. The motor is fixedly installed inside the waterproof chamber. The turntable is connected to the output shaft of the motor. One end of the rocker arm is rotatably connected to the turntable, and the other end of the rocker arm is rotatably connected to the connecting portion of the piston mechanism.

[0027] By adopting this technical solution, the motor is used to control the piston mechanism. A turntable and a rocker arm are installed on the output shaft of the motor, converting the rotation of the motor output shaft into the linear motion of the piston, enabling the piston to perform linear motion inside the filter chamber.

[0028] In summary, the present utility model includes at least one of the following beneficial technical effects:

[0029] By filtering the sediment in the flushing liquid by means of active pressure, it is possible to filter the flushing liquid actively under pressure when the mesh number of the filter holes is set relatively small, and better filter out the sediment particles wrapped in the flushing liquid, improving the filtering effect.

[0030] A one-way water inlet mechanism is provided on the piston. The one-way water inlet mechanism can enable the flushing liquid to only move in one direction along the piston when the piston moves, ensuring that the piston can continuously provide pressure for the flushing liquid and continuously filter the flushing liquid.

[0031] By providing a mud scraping plate and a one-way water inlet mechanism, the sediment accumulated on the filter holes can be scraped off and uniformly conveyed to one end of the filter chamber far from the water inlet, facilitating the unified treatment of the accumulated sediment.

[0032] A sand discharge port and a sealing cover are provided at one end far from the water inlet, and a pressure sensing mechanism is provided on the sealing cover. The pressure sensing mechanism can be used to judge the accumulation situation of sediment inside the filter chamber, and the sand discharge port can be opened according to the pressure sensing mechanism to treat the sediment accumulated inside the filter chamber, reducing the influence of the sediment accumulated inside the filter chamber on the filtering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is the overall structural schematic diagram of an embodiment of the present utility model;

[0034] Figure 2 is the external structural schematic diagram of the filter chamber of an embodiment of the present utility model;

[0035] Figure 3It is a schematic diagram of the internal structure of the filter chamber in the embodiment of the present utility model;

[0036] Figure 4 It is a schematic diagram showing the connection of the piston mechanism and the driving mechanism in the embodiment of the present utility model;

[0037] Figure 5 It is a front view schematic diagram of the piston mechanism in the embodiment of the present utility model

[0038] Figure 6 It is Figure 5 The enlarged schematic diagram of the structure at position A in

[0039] Figure 7 It is an enlarged schematic diagram of the seal structure;

[0040] Figure 8 It is Figure 3 The enlarged schematic diagram of the structure at position B in

[0041] Figure 9 It is Figure 8 The side sectional view schematic diagram of

[0042] Figure 10 It is Figure 9 The enlarged schematic diagram of the structure at position C in

[0043] Explanation of reference numerals: 1. Filter chamber; 101. Water inlet; 102. Filter holes; 103. Sand discharge port; 104. Sealing cover; 1041. Through hole; 1042. Limiting ring; 1043. Position sensor; 105. Waterproof chamber; 2. Main chamber; 201. Water outlet; 3. Piston mechanism; 301. Piston; 3011. Water inlet hole; 302. Connection part; 303. Unidirectional water inlet mechanism; 3031. Seal; 30311. Arc part; 3032. Connecting piece; 3033. Elastic piece; 3034. Mud scraper; 4. Driving mechanism; 401. Motor; 402. Turntable; 403. Rocker arm; 5. Pressure sensing mechanism; 501. Pressure sensing part; 502. Indicator part; 5021. Marking part; 5022. Limiting part; 503. Elastic piece. Detailed implementation manners

[0044] The following Figures 1 to 10 will further elaborate on the present utility model in detail.

[0045] The embodiment of the present utility model discloses a sand filtering device for geological drilling. Refer to Figure 1A sand filtering device for geological drilling mainly includes a main compartment 2, a filter compartment 1, a piston mechanism 3, a one-way water inlet mechanism 303, a driving mechanism 4 and a pressure sensing mechanism 5. The main compartment 2 is sleeved on the outer wall of the filter compartment 1, the piston mechanism 3 is slidably installed in the filter compartment 1 and is sealed with the inner wall of the filter compartment 1, the one-way water inlet mechanism 303 is installed on the piston mechanism 3, the driving mechanism 4 is fixedly installed in the filter compartment 1 and is transmission-connected with the piston mechanism 3, the pressure sensing mechanism 5 is installed on the filter compartment 1 at one end away from the water inlet 101, and the pressure sensing mechanism 5 is used to judge the amount of mud and sand accumulated in the filter compartment 1.

[0046] Reference Figure 2 The filter chamber 1 is cylindrical, and a plurality of filter holes 102 are evenly arranged on the side wall of the filter chamber 1. One end of the filter chamber 1 is a water inlet 101, and the other end of the filter chamber 1 is connected to a cover plate by bolts. A circular sand discharge port 103 is opened in the middle of the cover plate, and the sand discharge port 103 is connected to a sealing cover 104 by threads. A waterproof chamber 105 is also arranged inside the filter chamber 1, and a plurality of flange plates are also arranged on the outer wall of the filter chamber 1 by welding. In this way, after the flushing liquid enters the filter chamber 1 through the water inlet 101, it is filtered through the filter holes 102 on the side wall of the filter chamber 1, and the flushing liquid flows to the outside through the filter holes 102, and the sand and gravel are left inside the filter chamber 1; the setting of the sealing cover 104 facilitates the treatment of the mud and sand accumulated inside the filter chamber 1.

[0047] Reference Figures 1 to 2 The main chamber 2 is also cylindrical, and the diameter of the main chamber 2 is larger than the diameter of the filter chamber 1. The main chamber 2 is sleeved on the outer wall of the filter chamber 1. Flange plates are also provided at both ends of the main chamber 2. The main chamber 2 is connected to the flange plate of the filter chamber 1 by installing bolts on the flange plates at both ends. A water outlet 201 is provided on the side wall of the main chamber 2. In this way, the flushing liquid flows into the main chamber 2 after being filtered by the filter chamber 1, and flows away through the water outlet 201 provided on the side wall of the main chamber 2. The connection of the filter chamber 1 and the main chamber 2 through the flange plate can reduce the probability of the flushing liquid leaking from the gap between the filter chamber 1 and the main chamber 2.

[0048] Reference Figures 3 to 5, the piston mechanism 3 includes a piston 301, a connecting part 302, a mud scraper 3034 and a unidirectional water inlet mechanism 303. The piston 301 is circularly arranged, and the diameter of the piston 301 is smaller than the inner diameter of the filter chamber 1. The mud scraper 3034 is circularly arranged, and the inner edge of the mud scraper 3034 is fixedly connected to the piston 301. The outer diameter of the mud scraper 3034 is equal to the inner diameter of the filter chamber 1. The mud scraper 3034 is flexibly arranged. The connecting part 302 is fixedly installed on one end face of the piston 301. The connecting part 302 is arranged at the middle position of the piston 301. The unidirectional water inlet mechanism 303 is arranged on the piston 301. In this way, when the piston mechanism 3 moves inside the filter chamber 1, it can squeeze the flushing liquid and extrude the flushing liquid from the filter holes 102 on the side wall of the filter chamber 1. At the same time, since the piston 301 has a thickness, the filter holes 102 behind the piston will be blocked during the process of squeezing the flushing liquid to one side by the piston 301, preventing the filtered flushing liquid from flowing back. Filtering by squeezing the piston 301 can actively apply pressure to the flushing liquid when the filter holes 102 are small, and the filtering effect is better; the mud scraper 3034 can scrape off the sediment attached to the inner wall of the filter chamber 1 and reduce the probability of blockage of the filter holes 102.

[0049] Referring to Figures 3 to 4 , the driving mechanism 4 includes a motor 401, a turntable 402 and a rocker arm 403. The motor 401 is fixedly installed in the waterproof chamber 105 inside the filter chamber 1, and a control circuit is integrated on the motor 401. One end face of the turntable 402 is fixedly connected to the output shaft of the motor 401. The turntable 402 and the output shaft of the motor 401 are coaxially arranged. A positioning post is arranged on one end face of the turntable 402 away from the motor 401. The rocker arm 403 is a connecting part 302 with circular sleeves opened at both ends. The circular sleeve at one end of the rocker arm 403 is sleeved on the positioning post, and the sleeve at the other end is sleeved on the connecting post at one end of the connecting part 302 of the piston mechanism 3. In this way, the rotation of the output shaft of the motor 401 can be converted into the linear motion of the piston 301, so that the piston 301 can perform linear motion inside the filter chamber 1 and continuously apply pressure to the flushing liquid for active filtering.

[0050] Referring to Figures 5 to 7, the unidirectional water inlet mechanism 303 includes a seal 3031, a connecting member 3032 and an elastic member 3033. A plurality of circular water inlet holes 3011 are also formed in the piston 301. The connecting member 3032 includes a fixing portion and a rotating portion. The fixing portion is a boss welded to the piston 301, and a circular hole is provided in the middle of the boss. The rotating portion is a cylindrical rotating shaft, and the rotating shaft is inserted into the circular hole of the boss structure. The connecting member 3032 includes a rotating portion and a cover plate portion. The rotating portion is provided at one end of the cover plate portion. The rotating portion is provided with a through circular hole, and the rotating shaft is inserted into the circular hole of the rotating portion and the rotating portion is arranged on the boss. The cover plate portion is a circular cover plate with a diameter larger than the water inlet hole 3011. An arc portion 30311 is also provided on the end face of the cover plate portion close to the water inlet hole 3011. The arc portion 30311 is a patch made of rubber material, and the patch is adhered to the cover plate portion by glue. The arc portion 30311 can better seal the water inlet hole 3011; protrusions are also correspondingly provided on the fixing portion of the connecting member 3032 and the rotating portion of the seal 3031. The elastic member 3033 is a torsion spring sleeved on the rotating shaft of the connecting member 3032, and the two ends of the torsion spring respectively abut against the protrusions correspondingly provided on the fixing portion of the connecting member 3032 and the rotating portion of the seal 3031. In this way, when the piston 301 moves in the direction close to the water inlet 101, the seal 3031 opens. When the piston 301 moves in the direction away from the water inlet 101, the seal 3031 can abut against the water inlet hole 3011 under the pressure of the flushing liquid, achieving a sealing effect, so that the flushing liquid can only flow from the direction of the water inlet 101 to the direction away from the water inlet 101; the elastic member 3033 can actively press the seal 3031 against the water inlet hole 3011, reducing the probability of the flushing liquid leaking from the water inlet hole 3011.

[0051] Refer to Figures 8 to 10, the pressure sensing mechanism 5 includes a pressure sensing member 501, an indicating member 502 and an elastic member 503. A circular through hole 1041 is also provided on the sealing cover 104. A limiting ring 1042 is provided on the side of the through hole 1041 away from the piston 301. The limiting ring 1042 is a metal ring clamped inside the through hole 1041. The pressure sensing member 501 is an elastic rubber film fixedly arranged at one end of the through hole 1041. The elastic rubber film is fixed at the end of the through hole 1041 close to the filter chamber 1. The indicating member 502 is a cylindrical structure coated with a mark. A circular limiting portion 5022 is provided at one end of the cylindrical structure close to the pressure sensing member 501. The cooperation between the limiting portion 5022 and the limiting ring 1042 can limit the movement of the limiting portion 5022 between the limiting ring 1042 and the pressure sensing member 501. An elastic member 503 is also provided between the limiting ring 1042 and the limiting portion 5022. The elastic member 503 is a thrust spring sleeved on the indicating member 502. The two ends of the thrust spring respectively abut against the limiting ring 1042 and the limiting portion 5022. The other end of the limiting portion 5022 is adhered to the elastic rubber film by glue. The other cylindrical structure is the marking portion 5021. The marking portion 5021 passes through the through hole 1041 and is connected to a position sensor 1043 fixedly installed on the sealing cover 104. The position sensor 1043 is also electrically connected to the control circuit integrated on the motor 401. The position sensor 1043 uses a linear displacement sensor. The fixed end of the linear displacement sensor is fixedly installed on the sealing cover 104. The moving end of the linear displacement sensor abuts against the marking portion 5021 of the indicating member 502. After the sediment accumulates on the surface of the sealing cover 104, it will generate a certain pressure on the pressure sensing member 501. And the more sediment accumulates between the sealing cover 104 and the piston 301, the smaller the effective cavity between the sealing cover 104 and the piston 301 will be, and the greater the pressure of the flushing liquid between the sealing cover 104 and the piston 301 will be. During the movement of the piston 301, the more deformation the pressure sensing member 501 generates. After the pressure sensing member 501 is deformed under pressure, it drives the indicating member 502 to move more obviously in the direction away from the filter chamber 1. The staff can judge whether it is necessary to open the sealing cover 104 to discharge the sediment according to the moving distance of the indicating member 502. The setting of the position sensor 1043 can monitor the position of the indicating member 502 in real time, so as to send a signal to stop the motor 401 when the sediment accumulates full in the filter chamber 1, reducing the risk that the motor 401 cannot continue to compress and burn out after the sediment accumulates full between the sealing cover 104 and the piston 301.

[0052] The implementation principle of a sand filtration device for geological drilling in an embodiment of the present utility model is as follows: After the flushing fluid enters the filtration chamber 1 through the water inlet 101, under the action of the piston mechanism 3 and the one-way water inlet mechanism 303, it flows out from the filter holes 102 on the side wall of the filtration chamber 1 and enters the main chamber 2, while the mud and sand are blocked inside the filtration chamber 1 by the filter holes 102. During the movement of the piston mechanism 3, the mud and sand on the inner wall of the filtration chamber 1 are scraped off by the mud scraping plate 3034 and gradually accumulate at one end far from the water inlet 101 through the one-way water inlet mechanism 303 on the piston 301. After the mud and sand accumulate at one end of the filtration chamber 1 far from the water inlet 101, it exerts pressure on the pressure sensing member 501. After being pressurized, the pressure sensing member 501 drives the indicating member 502 to move. The accumulation situation of the mud and sand inside the filtration chamber 1 can be judged according to the extrusion situation of the indicating member 502 of the pressure sensing mechanism 5, and the sealing cover 104 is opened according to the mud and sand accumulation situation, so that the mud and sand are discharged from the sand discharge port 103.

[0053] In summary, this embodiment can actively press the flushing fluid through the movement of the piston 301 and filter the mud and sand in the flushing fluid through the filtration chamber 1. When the mesh number of the filter holes 102 is set to be relatively small, the flushing fluid is actively filtered under pressure, and the mud and sand particles wrapped in the flushing fluid can be better filtered out; the mud scraping plate 3034 and the one-way water inlet mechanism 303 provided on the piston 301 can scrape off the mud and sand accumulated on the filter holes 102 and uniformly transport them to one end of the filtration chamber 1 far from the water inlet 101, which is convenient for uniformly treating the accumulated mud and sand; the sand discharge port 103 and the pressure sensing mechanism 5 are provided at one end far from the water inlet 101, so that the accumulation situation of the mud and sand inside the filtration chamber 1 can be judged through the pressure sensing mechanism 5, and the sand discharge port 103 is opened according to the pressure sensing mechanism 5 to treat the mud and sand accumulated inside the filtration chamber 1, reducing the influence of the mud and sand accumulated inside the filtration chamber 1 on the filtration effect.

[0054] The above are all the preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present utility model shall be covered within the protection scope of the present utility model.

Claims

1. A sand filter device for geological drilling, comprising a filter chamber (1), characterized in that: It also includes a piston mechanism (3), a drive mechanism (4), and a main chamber (2); The main chamber (2) is provided with a water outlet (201), one end of the filter chamber (1) is provided with a water inlet (101), a plurality of filter holes (102) are provided on the side wall of the filter chamber (1), the main chamber (2) is sleeved outside the filter chamber (1), and a sealing arrangement is provided between the main chamber (2) and the filter chamber (1); The piston mechanism (3) comprises a piston (301) and a connecting portion (302), the connecting portion (302) being fixedly connected to the piston (301), the piston (301) being slidably arranged inside the filter chamber (1), the outer peripheral surface of the piston (301) being sealedly connected to the inner wall of the filter chamber (1), and a one-way water inlet mechanism (303) being arranged on the piston (301), the one-way water inlet mechanism (303) allowing fluid to flow inside the filter chamber (1) from the water inlet (101) to a direction away from the water inlet (101); The driving mechanism (4) is fixedly mounted inside the filter bin (1), and an output shaft of the driving mechanism (4) is drivingly connected to the connecting portion (302).

2. A sand filter device for geological drilling according to claim 1, characterized in that: The one-way water inlet mechanism (303) comprises a sealing member (3031) and a connecting member (3032); a water inlet hole (3011) is provided on the piston (301); the connecting member (3032) is mounted on an end surface of the piston (301) away from the connecting portion (302); the connecting member (3032) is arranged on one side of the water inlet hole (3011); one end of the sealing member (3031) is rotatably connected to the connecting member (3032); and the sealing member (3031) is arranged corresponding to the water inlet hole (3011).

3. A sand filter device for geological drilling according to claim 2, characterized in that: An elastic member (3033) is also provided between the sealing member (3031) and the connecting member (3032); one end of the elastic member (3033) is connected to the sealing member (3031), and the other end is connected to the connecting member (3032); the elastic member (3033) has a tendency to cause the sealing member (3031) to cover the water inlet hole (3011).

4. A sand filter device for geological drilling according to claim 3, characterized in that: An arc-shaped portion (30311) is also provided on the end surface of the sealing member (3031) close to the water inlet hole (3011); the arc-shaped portion (30311) is a flexible structure, and the position of the arc-shaped portion (30311) corresponds to the water inlet hole (3011).

5. A sand filter device for geological drilling according to any one of claims 1 to 4, characterized in that: A scraper plate (3034) is also fixedly arranged on the piston (301), the outer peripheral surface of the scraper plate (3034) is in contact with the inner wall of the filter bin (1), and the scraper plate (3034) is made of a flexible material.

6. A sand filter device for geological drilling according to claim 5, characterized in that: The end of the filter bin (1) away from the water inlet (101) is provided with a sand discharge port (103), and a sealing cover (104) is installed on the sand discharge port (103).

7. A sand filter device for geological drilling according to claim 6, characterized in that: The sealing cover (104) is provided with a pressure-sensing mechanism (5), the pressure-sensing mechanism (5) comprising a pressure-sensing member (501), an indicating member (502) and an elastic member (503); the sealing cover (104) is provided with a through hole (1041); the pressure-sensing member (501) is sealingly arranged on the through hole (1041); the indicating member (502) is arranged at one end of the pressure-sensing member (501) away from the filter bin (1); the indicating member (502) is inserted into the through hole (1041); the pressure-sensing member (501) is an elastic structure; and two ends of the elastic member (503) are respectively connected to the indicating member (502) and the sealing cover (104).

8. A sand filter device for geological drilling according to claim 7, characterized in that: A limiting ring (1042) is further provided at one end of the through hole (1041) away from the filter bin (1); the indicator (502) comprises an identification portion (5021) and a limiting portion (5022); the identification portion (5021) is connected to one end of the limiting portion (5022) away from the filter bin (1); and two ends of the elastic member (503) are respectively abutted between the limiting portion (5022) and the limiting ring (1042).

9. A sand filter device for geological drilling according to claim 8, characterized in that: A position sensor (1043) is also provided on the sealing cover (104), the position sensor (1043) is provided corresponding to the indicator (502), and the position sensor (1043) is electrically connected to the driving mechanism (4).

10. A sand filter device for geological drilling according to any one of claims 1 to 4, characterized in that: The driving mechanism (4) comprises a motor (401), a rotating disk (402) and a rocker arm (403); one side of the filter chamber (1) is also connected to a waterproof chamber (105); the motor (401) is fixedly mounted inside the waterproof chamber (105); the rotating disk (402) is connected to an output shaft of the motor (401); one end of the rocker arm (403) is rotatably connected to the rotating disk (402); and the other end of the rocker arm (403) is rotatably connected to the connecting portion (302) of the piston mechanism (3).

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