A dust recovery device for an oilfield drilling pneumatic conveying system

Abstract

The application discloses a dust recovery device for an oil field drilling pneumatic conveying system and belongs to the technical field of dust recovery. The dust recovery device comprises a storage tank, an adsorption assembly is arranged in the storage tank, a cyclone dust collector is fixedly connected to the top of the storage tank, two opposite connecting size tubes are fixedly connected to the top of the cyclone dust collector, a filter assembly is fixedly connected between the two size tubes through a connecting flange, and a scraping assembly is drivingly connected to the bottom of the filter assembly. In the application, the filter assembly is arranged, the first connecting shaft drives the extruding wheel to rotate through the connecting rod, the extruding wheel periodically contacts the extruding block, the extruding wheel drives the extruding block to move, the extruding block drives the sliding ring to reciprocate in cooperation with the return spring, the sliding ring drives the filter plate to reciprocate through the sliding inner ring, the powder attached to the filter plate can be shaken off, the filter plate is prevented from being blocked to affect the powder filtering effect, and thus the purification rate of the discharged gas is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of dust recovery, and particularly relates to a dust recovery device for an oilfield drilling pneumatic conveying system. BACKGROUND

[0002] In marine drilling and cementing operations, cement, bentonite, barite and other powders need to be stored in a storage tank. Pneumatic conveying of powders is currently a common practice. The principle is that the powders are mixed with dry air to form a fluid state, and the powders are conveyed by using gas pressure as a power source. The gas-solid mixed phase flow enters the target storage tank, and the powders fall into the tank by gravity, and the gas is discharged outside, thereby realizing the conveying of the powders. The discharged gas is generally collected by a cyclone dust collector and a dust recovery device, and the gas after dust removal is directly vented or discharged into the sea.

[0003] The invention patent of Chinese patent application number CN202110588855.0 discloses a flue gas outlet device of an air preheater, which comprises a flue, the flue comprises a flue gas input end connected with a main body of the air preheater, a flue gas output end, and a flue gas dust collection end; and a connecting part connecting the flue gas input end, the flue gas output end and the dust collection end; the connecting part is provided with a slope surface for colliding flue gas to settle dust, the flue gas dust collection end is used for collecting settled dust, the flue gas output end is used for outputting flue gas after the dust is settled, the flue gas dust collection end is arranged below the connecting part, and the flue gas dust collection end comprises a settled dust hopper connected with the connecting part and a closed dust unloading device connected with the settled dust hopper. The present application effectively solves the problems of increased flue resistance, increased induced draft fan power consumption and increased exhaust gas temperature, reduced heat exchange effect of the air preheater and increased heat loss due to flue dust accumulation, and recycles the dust, which is environmentally friendly and increases the income. However, in the actual application process, the gas after dust removal is directly vented or discharged into the sea, and a part of the dust is still entrained in the gas, causing waste of powders and environmental pollution. SUMMARY

[0004] The purpose of the present application is to solve the problem of waste of powders and environmental pollution caused by the gas after dust removal being directly vented or discharged into the sea, and to provide a dust recovery device for an oilfield drilling pneumatic conveying system.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0006] A dust recovery device for an oilfield drilling pneumatic conveying system, comprising a storage tank, an adsorption assembly is arranged inside the storage tank, a cyclone dust collector is fixedly connected to the top of the storage tank, two oppositely connected size tubes are fixedly connected to the top of the cyclone dust collector, a filter assembly is fixedly connected between the two size tubes through a connecting flange, and a scraping assembly is drivingly connected to the bottom of the filter assembly.

[0007] The filter assembly comprises a connecting box fixedly connected between two connecting flanges, two mounting rods fixedly connected in the connecting box, bearings embedded in the center positions of the mounting rods, a first connecting shaft rotatably connected between the two bearings, a sliding inner ring slidingly connected to the outer surface of the first connecting shaft, a filter plate fixedly connected to the outer side of the sliding inner ring, the filter plate being circular in cross-sectional shape, a sliding outer ring fixedly connected to the outer side of the filter plate, the sliding outer ring being in abutment with the inner wall of the connecting box and slidingly connected in the connecting box, a sliding ring fixedly connected to the bottom of the sliding inner ring, the sliding ring being slidingly connected to the outer surface of the first connecting shaft, limit blocks fixedly connected to the inner wall of the sliding ring on both sides, limit grooves formed in the outer surface of the first connecting shaft on both sides, and the limit blocks being slidingly connected in the limit grooves.

[0008] As a further description of the above technical solution:

[0009] The first connecting shaft is fixedly connected with connecting rods on both sides, the connecting rods are fixedly connected with extrusion wheels at the bottom, the sliding inner ring is fixedly connected with a plurality of extrusion blocks at the top, the extrusion blocks are distributed in an equiangular circular array along the axial position of the first connecting shaft, the extrusion blocks are trapezoidal in cross-sectional shape, and the extrusion wheels are in abutment with the extrusion blocks.

[0010] As a further description of the above technical solution:

[0011] The sliding outer ring is fixedly connected with sliding sleeves around the periphery, first sliding grooves are formed in the inner wall of the connecting box around the periphery, the sliding sleeves are slidingly connected in the first sliding grooves, sliding rods are fixedly connected in the first sliding grooves, and the sliding rods are slidingly connected with the sliding sleeves.

[0012] As a further description of the above technical solution:

[0013] The first connecting shaft is clamped with a limit plate at the bottom outer surface, the first connecting shaft is sleeved with a reset spring, and the reset spring is fixedly connected with the limit plate on one side and the sliding ring on one side respectively.

[0014] As a further description of the above technical solution:

[0015] A first motor is fixedly connected to one side of the connecting box through a mounting plate, a second connecting shaft is fixedly connected to one end of the output shaft of the first motor, a first bevel gear is fixedly connected to one end of the second connecting shaft extending into the connecting box, a second bevel gear is engaged on one side of the first bevel gear, and the second bevel gear is clamped with the outer surface of the first connecting shaft.

[0016] As a further description of the above technical solution:

[0017] The scraping assembly comprises a cleaning roller, one end of the cleaning roller is fixedly connected with a rotating shaft, bearings are embedded on both sides of the sliding ring, and the rotating shaft is rotatably connected in the bearings, a second gear is fixedly connected to the end of the cleaning roller away from the sliding ring through the rotating shaft, a second tooth ring is engaged on the top of the second gear, and the top of the second tooth ring is fixedly connected with the bottom of the sliding outer ring.

[0018] As a further description of the above technical solution:

[0019] The adsorption assembly comprises a fourth connecting shaft, the fourth connecting shaft is rotatably connected in the storage box through bearings, two connecting rings are fixedly connected to the outer surface of the fourth connecting shaft, rotating rings are arranged outside the connecting rings, the outer wall of the rotating ring is attached to the inner wall of the storage box, a plurality of adsorption plates are rotatably connected between the connecting rings and the rotating rings through a third connecting shaft, a second motor is fixedly connected to the bottom of the storage box through a mounting plate, and the output shaft of the second motor extends into the storage box and is fixedly connected to one end of the fourth connecting shaft.

[0020] As a further description of the above technical solution:

[0021] The rotating ring is fixedly connected with a sliding block outside, a second sliding groove is formed in the inner wall of the storage box, the sliding block is slidably connected in the second sliding groove, and the cross-sectional shape of the second sliding groove is annular.

[0022] As a further description of the above technical solution:

[0023] A third sliding groove is formed in the inner wall of the storage box, the cross-sectional shape of the third sliding groove is annular, a first tooth ring is fixedly connected to the inner wall bottom of the third sliding groove, a first gear is fixedly connected to one end of the third connecting shaft, and the bottom of the first gear is engaged with the first tooth ring.

[0024] As a further description of the above technical solution:

[0025] A feeding port is fixedly connected to one side of the storage box, and a plurality of supporting legs are fixedly connected to the bottom of the storage box.

[0026] As described above, due to the adoption of the above technical solution, the beneficial effects of the present application are:

[0027] 1. In this invention, by setting up a filter assembly, a first motor drives a first bevel gear to rotate via a second connecting shaft, the first bevel gear drives a first rotating shaft to rotate via a second bevel gear, the first connecting shaft drives an extrusion wheel to rotate via a connecting rod, the extrusion wheel periodically contacts the extrusion block, the extrusion wheel drives the extrusion block to move, the extrusion block, in conjunction with a reset spring, drives a sliding ring to reciprocate, the sliding ring drives a filter plate to reciprocate via a sliding inner ring, which can shake off the powder adhering to the filter plate, avoid the filter plate from clogging and affecting the filtration effect of the powder, thereby improving the purification rate of the exhaust gas.

[0028] 2. In this invention, by setting up an adsorption component, the second motor drives the fourth connecting shaft to rotate, the fourth connecting shaft drives the first gear to rotate on the first gear ring through the connecting ring, the first gear ring drives the first gear to rotate, and the first gear drives the adsorption plate to rotate through the third connecting shaft, thereby adsorbing and intercepting the powder, reducing the amount of powder entering the cyclone dust collector, reducing the powder content in the airflow, thereby reducing the amount of powder that the filter plate needs to filter and intercept, and thus improving the purification effect on the exhaust gas.

[0029] 3. In this invention, by setting up a scraping assembly, the first connecting shaft drives the limiting block to rotate through the limiting groove, the limiting block drives the sliding ring to rotate, the sliding ring drives the cleaning roller to rotate through the rotating shaft, and at the same time, the cleaning roller drives the second gear to rotate on the second gear ring, the second gear ring drives the second gear to rotate, and the second gear drives the cleaning roller to clean the filter plate, so as to avoid the filter plate from clogging and improve the purification effect. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural schematic diagram of a dust recovery device for an oilfield drilling pneumatic conveying system proposed in this invention;

[0031] Figure 2 This is a front view cross-sectional structural diagram of the adsorption component of a dust recovery device for an oilfield drilling pneumatic conveying system proposed in this invention.

[0032] Figure 3 This invention proposes a dust recovery device for an oilfield drilling pneumatic conveying system. Figure 2 A magnified structural diagram of part A in the diagram;

[0033] Figure 4 This is a side view cross-sectional structural diagram of a filter assembly for a dust recovery device in an oilfield drilling pneumatic conveying system, as proposed in this invention.

[0034] Figure 5 This invention proposes a dust recovery device for an oilfield drilling pneumatic conveying system. Figure 4 A magnified structural diagram of part B in the diagram;

[0035] Figure 6 The dust recovery device for the oil field drilling pneumatic conveying system of the present application is characterized in that the dust recovery device comprises a storage tank, a feeding inlet, a cyclone dust collector, a filter assembly, a connecting box, a first motor, a first bevel gear, a second bevel gear, a first connecting shaft, a connecting rod, a sliding inner ring, a limiting block, a limiting groove, a return spring, a limiting plate, a sliding ring, a filter plate, an extrusion block, an extrusion wheel, a second connecting shaft, a first sliding groove, a sliding rod, a sliding sleeve, a sliding outer ring, a mounting rod, a large pipe, a connecting flange, an adsorption assembly, a first gear, a third connecting shaft, a rotating ring, a connecting ring, an adsorption plate, a fourth connecting shaft, a second motor, a sliding block, a second sliding groove, a third sliding groove, a first tooth ring, a scraping assembly, a cleaning roller, a second gear, and a second tooth ring. Figure 4

[0036] Figure 7 The dust recovery device for the oil field drilling pneumatic conveying system of the present application is characterized in that the dust recovery device comprises a storage tank, a feeding inlet, a cyclone dust collector, a filter assembly, a connecting box, a first motor, a first bevel gear, a second bevel gear, a first connecting shaft, a connecting rod, a sliding inner ring, a limiting block, a limiting groove, a return spring, a limiting plate, a sliding ring, a filter plate, an extrusion block, an extrusion wheel, a second connecting shaft, a first sliding groove, a sliding rod, a sliding sleeve, a sliding outer ring, a mounting rod, a large pipe, a connecting flange, an adsorption assembly, a first gear, a third connecting shaft, a rotating ring, a connecting ring, an adsorption plate, a fourth connecting shaft, a second motor, a sliding block, a second sliding groove, a third sliding groove, a first tooth ring, a scraping assembly, a cleaning roller, a second gear, and a second tooth ring.

[0037] Legend:

[0038] 1, storage tank; 2, feeding inlet; 3, cyclone dust collector; 4, filter assembly; 401, connecting box; 402, first motor; 403, first bevel gear; 404, second bevel gear; 405, first connecting shaft; 406, connecting rod; 407, sliding inner ring; 408, limiting block; 409, limiting groove; 410, return spring; 411, limiting plate; 412, sliding ring; 413, filter plate; 414, extrusion block; 415, extrusion wheel; 416, second connecting shaft; 417, first sliding groove; 418, sliding rod; 419, sliding sleeve; 420, sliding outer ring; 421, mounting rod; 5, large pipe; 6, connecting flange; 7, adsorption assembly; 701, first gear; 702, third connecting shaft; 703, rotating ring; 704, connecting ring; 705, adsorption plate; 706, fourth connecting shaft; 707, second motor; 708, sliding block; 709, second sliding groove; 710, third sliding groove; 711, first tooth ring; 8, scraping assembly; 801, cleaning roller; 802, second gear; 803, second tooth ring. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0040] Please refer to Figure 1 - Figure 7 The present application provides a technical solution:

[0041] ​A dust recovery device for oil field drilling pneumatic conveying system, including storage tank 1, storage tank 1 inside is provided with adsorption assembly 7, storage tank 1 top is fixedly connected with cyclone dust collector 3, cyclone dust collector 3 top is fixedly connected with two opposite connecting size tube 5, and two size tube 5 are fixedly connected with filter assembly 4 through connecting flange 6, filter assembly 4 bottom drive connection has scraping assembly 8, storage tank 1 one side is fixedly connected with feed inlet 2, storage tank 1 bottom is fixedly connected with a plurality of support legs.

[0042] Scraping assembly 8 includes cleaning roller 801, one end of cleaning roller 801 is fixedly connected with rotating shaft, both sides of sliding ring 412 are embedded with bearing, and rotating shaft is rotatably connected in bearing, one end of cleaning roller 801 away from sliding ring 412 is fixedly connected with second gear 802 through rotating shaft, second gear 802 top is engaged with second gear ring 803, and second gear ring 803 top is fixedly connected with sliding outer ring 420 bottom.

[0043] The embodiment is specific: by setting scraping assembly 8, first connecting shaft 405 drives limiting block 408 to rotate through limiting groove 409, limiting block 408 drives sliding ring 412 to rotate, sliding ring 412 drives cleaning roller 801 to rotate through rotating shaft, at the same time, cleaning roller 801 drives second gear 802 to rotate on second gear ring 803, second gear ring 803 drives second gear 802 to rotate, second gear 802 drives cleaning roller 801 to clean filter plate 413, to avoid filter plate 413 blockage.

[0044] The filter assembly 4 comprises a connecting box 401 fixedly connected between the two connecting flanges 6, two mounting rods 421 fixedly connected in the connecting box 401, bearings embedded at the center positions of the mounting rods 421, a first connecting shaft 405 rotatably connected between the two bearings, a sliding inner ring 407 slidingly connected to the outer surface of the first connecting shaft 405, a filter plate 413 fixedly connected to the outer side of the sliding inner ring 407, the filter plate 413 being circular in cross-sectional shape, a sliding outer ring 420 fixedly connected to the outer side of the filter plate 413, the sliding outer ring 420 being in abutment with the inner wall of the connecting box 401 and slidingly connected in the connecting box 401, a sliding ring 412 fixedly connected to the bottom of the sliding inner ring 407 and slidingly connected to the outer surface of the first connecting shaft 405, limit blocks 408 fixedly connected to the inner wall of the sliding ring 412 on both sides, limit grooves 409 formed in the outer surface of the first connecting shaft 405 on both sides and in which the limit blocks 408 are slidingly connected, connecting rods 406 fixedly connected to the first connecting shaft 405 on both sides, extrusion wheels 415 fixedly connected to the bottom of the connecting rods 406, a plurality of extrusion blocks 414 fixedly connected to the top of the sliding inner ring 407 and arranged in an equiangular circular array along the axial position of the first connecting shaft 405, the extrusion blocks 414 being trapezoidal in cross-sectional shape, the extrusion wheels 415 being in abutment with the extrusion blocks 414, sliding sleeves 419 fixedly connected to the periphery of the sliding outer ring 420, first sliding grooves 417 formed in the inner wall of the connecting box 401 on the periphery and in which the sliding sleeves 419 are slidingly connected, sliding rods 418 fixedly connected in the first sliding grooves 417 and slidingly connected with the sliding sleeves 419, a limit plate 411 clamped to the outer surface of the bottom of the first connecting shaft 405, a return spring 410 sleeved on the outer surface of the first connecting shaft 405 and fixedly connected at both ends to one side of the limit plate 411 and one side of the sliding ring 412, a first motor 402 fixedly connected to one side of the connecting box 401 through a mounting plate, a second connecting shaft 416 fixedly connected at one end to the output shaft of the first motor 402 and extending into the connecting box 401 and fixedly connected at one end to a first bevel gear 403, a second bevel gear 404 engaged on one side of the first bevel gear 403 and clamped to the outer surface of the first connecting shaft 405.

[0045] The embodiment is specific: by setting the filtering assembly 4, the first motor 402 drives the first bevel gear 403 to rotate, the first bevel gear 403 drives the first rotating shaft to rotate, the first connecting shaft 405 drives the extrusion wheel 415 to rotate, the extrusion wheel 415 periodically contacts the extrusion block 414, the extrusion wheel 415 drives the extrusion block 414 to move, the extrusion block 414 cooperates with the return spring 410 to drive the sliding ring 412 to reciprocate, the sliding ring 412 drives the filter plate 413 to reciprocate through the sliding inner ring 407, and the powder attached to the filter plate 413 can be shaken off, so that the filter plate 413 is prevented from being blocked and the filtering effect on the powder is affected.

[0046] The adsorption assembly 7 comprises a fourth connecting shaft 706 rotatably connected in the storage box 1 through a bearing, two connecting rings 704 are fixedly connected to the outer surface of the fourth connecting shaft 706, a rotating ring 703 is arranged on the outer side of the connecting ring 704, the outer wall of the rotating ring 703 is in close contact with the inner wall of the storage box 1, a plurality of adsorption plates 705 are rotatably connected between the connecting ring 704 and the rotating ring 703 through a third connecting shaft 702, a second motor 707 is fixedly connected to the bottom of the storage box 1 through a mounting plate, one end of the output shaft of the second motor 707 extends into the storage box 1 and is fixedly connected to one end of the fourth connecting shaft 706, a sliding block 708 is fixedly connected to the outer side of the rotating ring 703, a second sliding groove 709 is formed in the inner wall of the storage box 1, and the sliding block 708 is slidably connected in the second sliding groove 709. The second sliding groove 709 has an annular cross-sectional shape, a third sliding groove 710 is formed in the inner wall of the storage box 1, the third sliding groove 710 has an annular cross-sectional shape, a first tooth ring 711 is fixedly connected to the inner wall bottom of the third sliding groove 710, and a first gear 701 is fixedly connected to one end of the third connecting shaft 702. The bottom of the first gear 701 is engaged with the first tooth ring 711.

[0047] The embodiment is specific: by setting the adsorption assembly 7, the second motor 707 drives the first gear 701 to rotate on the first tooth ring 711 through the fourth connecting shaft 706, the first tooth ring 711 drives the first gear 701 to rotate, the first gear 701 drives the adsorption plate 705 to rotate, and the powder is adsorbed and intercepted, so that the amount of powder entering the cyclone dust collector 3 is reduced, the content of the powder in the airflow is reduced, the filtering burden of the filtering assembly 4 is reduced, and the filtering efficiency is improved.

[0048] Working principle: in use, the staff will be powder through the feed inlet 2 to the storage tank 1, then, cyclone dust collector 3 on the powder in the storage tank 1 is adsorbed output, in the process, the second motor 707 driven fourth connecting shaft 706 rotation, fourth connecting shaft 706 drive connecting ring 704 rotation, connecting ring 704 through the third connecting shaft 702 rotation, the third connecting shaft 702 drive first gear 701 on the first gear ring 711 rotation, the first gear ring 711 drive first gear 701 rotation, first gear 701 through the third connecting shaft 702 drive adsorption plate 705 rotation, and the powder adsorption interception, so that the cyclone dust collector 3 into the powder quantity is reduced.

[0049] At the same time, when the cyclone dust collector 3 with powder gas flow through the discharge port and size tube 5 into the connecting box 401, filter plate 413 can filter the powder in the gas flow isolation, in the process, the first motor 402 drive second connecting shaft 416 rotation, the second shaft drive first bevel gear 403 rotation, the first bevel gear 403 drive second bevel gear 404 rotation, the second bevel gear 404 drive first shaft rotation, the first connecting shaft 405 drive connecting rod 406 rotation, connecting rod 406 drive extrusion wheel 415 rotation, extrusion wheel 415 periodically with extrusion block 414 interface, extrusion wheel 415 drive extrusion block 414 movement, extrusion block 414 drive sliding inner ring 407 on the first connecting shaft 405 outer surface sliding, at the same time, reset spring 410 drive sliding ring 412 reset movement, sliding ring 412 drive sliding inner ring 407 reset movement, sliding inner ring 407 drive filter plate 413 reciprocating motion, can be attached to the filter plate 413 on the powder vibration fall, at the same time, the first connecting shaft 405 drive limit groove 409 rotation, limit groove 409 drive limit block 408 rotation, limit block 408 drive sliding ring 412 rotation, sliding ring 412 through the shaft drive cleaning roller 801 rotation, at the same time, cleaning roller 801 drive second gear 802 on the second gear ring 803 rotation, the second gear ring 803 drive second gear 802 rotation, second gear 802 drive cleaning roller 801 clean filter plate 413, after the filter treatment of gas through size tube 5 after discharge.

[0050] The above, only for the preferred specific embodiments of the present application, but the scope of protection of the present application is not limited to this, any skilled in the art of the technical personnel in the technical range disclosed by the present application, according to the technical scheme of the present application and the invention concept of equivalent replacement or change, should be covered in the protection scope of the present application.

Claims

1. A dust recovery device for an oil field drilling pneumatic conveying system comprising a storage tank (1), characterized in that, The storage box (1) is internally provided with an adsorption assembly (7), the top of the cyclone dust collector (3) is fixedly connected with two oppositely connected size tubes (5), and the filter assembly (4) is fixedly connected between the two size tubes (5) through the connecting flanges (6), and the bottom of the filter assembly (4) is drivingly connected with a scraping assembly (8); The filter assembly (4) comprises a connecting box (401) fixedly connected between the two connecting flanges (6), two mounting rods (421) fixedly connected in the connecting box (401), bearings embedded in the center positions of the mounting rods (421), a first connecting shaft (405) rotatably connected between the two bearings, a sliding inner ring (407) slidingly connected to the outer surface of the first connecting shaft (405), a filter plate (413) fixedly connected to the outer side of the sliding inner ring (407), the filter plate (413) being circular in cross-sectional shape, a sliding outer ring (420) fixedly connected to the outer side of the filter plate (413), the sliding outer ring (420) being in abutment with the inner wall of the connecting box (401) and slidingly connected in the connecting box (401), a sliding ring (412) fixedly connected to the bottom of the sliding inner ring (407), the sliding ring (412) slidingly connected to the outer surface of the first connecting shaft (405), limit blocks (408) fixedly connected to the inner wall of the sliding ring (412) on both sides, limit grooves (409) formed in the outer surface of the first connecting shaft (405) on both sides, and the limit blocks (408) slidingly connected in the limit grooves (409); The first connecting shaft (405) is fixedly connected with connecting rods (406) on both sides, the connecting rods (406) are fixedly connected with extrusion wheels (415) at the bottom, the sliding inner ring (407) is fixedly connected with a plurality of extrusion blocks (414) at the top, the plurality of extrusion blocks (414) are distributed in an equiangular circular array along the axial position of the first connecting shaft (405), the extrusion blocks (414) are trapezoidal in cross-sectional shape, and the extrusion wheels (415) are in abutment with the extrusion blocks (414); The sliding outer ring (420) is fixedly connected with sliding sleeves (419) around, the inner wall of the connecting box (401) is provided with first sliding grooves (417) around, the sliding sleeves (419) are slidingly connected in the first sliding grooves (417), the first sliding grooves (417) are fixedly connected with sliding rods (418) therein, and the sliding rods (418) are slidingly connected with the sliding sleeves (419); The first connecting shaft (405) is clamped with a limit plate (411) at the bottom of the outer surface, the first connecting shaft (405) is sleeved with a reset spring (410) on the outer surface, and the reset spring (410) is fixedly connected with the limit plate (411) on one side and the sliding ring (412) on the other side. The scraping assembly (8) comprises a cleaning roller (801), one end of the cleaning roller (801) is fixedly connected with a rotating shaft, both sides of the sliding ring (412) are embedded with bearings, and the rotating shaft is rotationally connected in the bearings.

2. A dust recovery device for an oilfield drilling pneumatic conveying system as defined in claim 1, wherein, One side of the connecting box (401) is fixedly connected with a first motor (402) through a mounting plate, one end of an output shaft of the first motor (402) is fixedly connected with a second connecting shaft (416), one end of the second connecting shaft (416) extends into the connecting box (401) and is fixedly connected with a first bevel gear (403), one side of the first bevel gear (403) is engaged with a second bevel gear (404), and the second bevel gear (404) is clamped with the outer surface of a first connecting shaft (405).

3. A dust recovery device for an oilfield drilling pneumatic conveying system as defined in claim 1, wherein, One end of the cleaning roller (801) away from the sliding ring (412) is fixedly connected with a second gear (802) through the rotating shaft, the top of the second gear (802) is engaged with a second tooth ring (803), and the top of the second tooth ring (803) is fixedly connected with the bottom of the sliding outer ring (420).

4. The dust recovery device for an oilfield drilling pneumatic conveying system of claim 1, wherein, The adsorption assembly (7) comprises a fourth connecting shaft (706), the fourth connecting shaft (706) is rotationally connected in the storage box (1) through a bearing, the outer surface of the fourth connecting shaft (706) is fixedly connected with two connecting rings (704), the outer side of the connecting ring (704) is provided with a rotating ring (703), the outer wall of the rotating ring (703) is attached with the inner wall of the storage box (1), a plurality of adsorption plates (705) are rotationally connected between the connecting ring (704) and the rotating ring (703) through a third connecting shaft (702), the bottom of the storage box (1) is fixedly connected with a second motor (707) through a mounting plate, one end of an output shaft of the second motor (707) extends into the storage box (1) and is fixedly connected with one end of the fourth connecting shaft (706).

5. A dust recovery device for an oilfield drilling pneumatic conveying system as defined in claim 4, wherein, The outer side of the rotating ring (703) is fixedly connected with a sliding block (708), the inner wall of the storage box (1) is provided with a second sliding groove (709), the sliding block (708) is slidingly connected in the second sliding groove (709), and the second sliding groove (709) is annular in cross-section shape.

6. A dust recovery device for an oilfield drilling pneumatic conveying system as defined in claim 4, wherein, The inner wall of the storage box (1) is provided with a third sliding groove (710), the third sliding groove (710) is annular in cross-section shape, the inner wall bottom of the third sliding groove (710) is fixedly connected with a first tooth ring (711), one end of the third connecting shaft (702) is fixedly connected with a first gear (701), and the bottom of the first gear (701) is engaged with the first tooth ring (711).

7. The dust recovery device for an air-assisted delivery system for drilling oil and gas wells of claim 1, wherein, One side of the storage box (1) is fixedly connected with a feeding port (2), and the bottom of the storage box (1) is fixedly connected with a plurality of supporting legs.

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