A wear resistant granular gate valve for oil extraction

Abstract

The present application relates to oil well gate valve technical field, especially to a kind of wear-resistant particle gate valve special for oil exploitation, including the valve body connected with inlet pipe and outlet pipe, the inside of the valve body is slidably connected with outer gate, the inside of the outer gate is movably connected with two inner gates by differential drive mechanism, the differential drive mechanism drives outer gate and two inner gates to move at different speeds up and down.The present application drives outer gate to move up and down by opening and closing drive mechanism, and through the action of differential drive mechanism, when outer gate moves up, it can drive the two inner gates inside it to move up at a faster speed, so that the two inner gates move to the inside of outer gate, at this time, sand and stone particles in oil directly impact outer gate, without directly impacting two inner gates, so that the lower end edge of inner gate can be well prevented from being worn by sand and stone particles, preventing gate valve from leaking, and improving the use reliability of gate valve.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil well gate valves, in particular to a wear-resistant particle gate valve for oil exploitation. BACKGROUND

[0002] In oil exploitation, the oil well head gate valve is a key component for controlling the flow of oil in the oil well pipeline. By controlling the opening and closing of the gate valve, the flow state of oil in the oil well pipeline can be adjusted to regulate the production of oil and gas and isolate the wellhead pressure to ensure safe production.

[0003] The existing gate valve commonly used in the oil exploitation industry is similar in structure to the traditional industrial gate valve, which includes a valve body, a gate plate and a valve stem for driving the gate plate to move up and down. By controlling the up and down movement of the valve stem, the valve plate can be driven to move up and down, thereby achieving the opening and closing control of the oil well pipeline.

[0004] A wellhead gate valve is disclosed in Chinese Patent No. CN2599222Y, which is composed of a valve body, a valve plate, a valve seat, a sealing rubber ring, etc. The inner cavity of the valve body has two valve seats connected to the valve body, each with a sealing rubber ring on the back surface. The valve plate with a semicircular flow guide hole at the front end is located between the two valve seats in the inner cavity of the valve body and is connected to the valve stem.

[0005] Based on the above search and comparison with existing technology, it is found that the traditional structure of the gate valve has certain drawbacks when applied in oil pipelines. Since the freshly extracted oil contains a large amount of sand and other particle impurities, these impurities will flow at high speed in the pipeline along with the oil. When the gate plate is opening and closing, the gap between the gate plate and the valve body will change. When the gap decreases, the flow rate of the oil at that gap increases, and the impurity particles in the oil will impact the gate plate, thereby accelerating the wear of the surface and the edge of the gate plate. Over time, dents and cracks will appear at the edge of the gate plate, reducing the fit of the gate plate and the valve seat and the sealing effect of the gate valve. SUMMARY

[0006] The present application aims to provide a wear-resistant particle gate valve for oil exploitation to solve the problems raised in the background art.

[0007] The technical scheme of the present application is: a wear-resistant particle gate valve special for oil exploitation, comprising a valve body connected with an inlet pipe and an outlet pipe, an outer gate plate slidingly connected to the inner side of the valve body, two inner gate plates movably connected to the inner side of the outer gate plate through a differential drive mechanism, and the differential drive mechanism driving the outer gate plate and the two inner gate plates to move up and down at different speeds; the differential drive mechanism comprises two side racks fixed on both sides of the inside of the valve body, two receiving grooves opened on both sides of the inside of the outer gate plate, two gears rotatably arranged on both sides of the outer gate plate, one sliding plate slidingly connected to the inner side of the two receiving grooves, a double-sided rack fixed on the upper side of the sliding plate and penetrating the outer gate plate, the two inner gate plates slidingly connected to the lower side of the sliding plate, the double-sided rack meshing with one side of the two gears, and the two side racks meshing with the other side of the two gears; further comprising: an opening and closing drive mechanism driving the outer gate plate to move up and down; and an opening and closing guide mechanism driving the two inner gate plates to combine and separate.

[0008] Preferably, the opening and closing guide mechanism comprises two sliding pins penetrating and rotatably connected to the inside of the two inner gate plates, and two guide grooves opened on both sides of the inside of the valve body, and the two ends of the two sliding pins are movably matched with the inner sides of the two guide grooves.

[0009] Preferably, the guide groove comprises a lower vertical groove opened on the inner side of the valve body, two mutually parallel upper vertical grooves, and two symmetrically arranged inclined grooves, one end of each of the two upper vertical grooves is smoothly connected with one end of each of the two inclined grooves, the other end of each of the two inclined grooves is smoothly connected with the upper end of the lower vertical groove, and the width of the lower vertical groove is twice the width of the inclined grooves and the upper vertical grooves.

[0010] Preferably, the lower side of the sliding plate is provided with a plurality of guide sliding grooves, and the upper ends of the two inner gate plates are each fixed with a plurality of guide sliding strips slidingly connected with the inner sides of the guide sliding grooves.

[0011] Preferably, the outer gate plate is provided with a through hole at a position corresponding to each of the two gears, and each of the two through holes is rotatably connected with a gear shaft, and each of the two gear shafts penetrates the inside of each of the two gears.

[0012] Preferably, the opening and closing drive mechanism comprises a top cover fixed on the top end of the valve body, two inner thread sleeves rotatably connected to the upper two ends of the top cover, two lifting screws penetrating the top cover and threadedly connected to the inner sides of the two inner thread sleeves, the lower ends of the two lifting screws being fixedly connected with the upper end of the outer gate plate, two sleeve gears fixed to the outer sides of the two inner thread sleeves, a driving gear rotatably connected to the upper middle position of the top cover and meshing with the two sleeve gears, and a rotating disc fixed to the upper end of the driving gear.

[0013] Preferably, the lower ends of the two receiving grooves are provided with a sealing baffle mechanism, the sealing baffle mechanism comprises two folding grooves opened in the lower ends of the two receiving grooves, the sides of the two folding grooves are fixed with connecting plates at the upper end positions, the outer sides of the two connecting plates are rotatably connected with a baffle through a baffle shaft, and the two ends of the two connecting plates are elastically connected with the two baffles through torsion springs.

[0014] Preferably, the sides of the two folding grooves are fixed with fixed limiting baffles at the upper side positions, and the upper sides of the two baffles are fixed with movable limiting baffles rotating with the baffles.

[0015] Preferably, the inner side of the valve body is provided with a sealing strip at the positions corresponding to the two inner gate plates.

[0016] Preferably, the two surfaces of the two inner gate plates in contact with each other are frosted surfaces.

[0017] The application provides a wear-resistant particle gate valve for oil extraction by improvement, and has the following improvements and advantages compared with the prior art.

[0018] Firstly, the outer gate plate is driven to move up and down by the opening and closing driving mechanism, and the two inner gate plates inside the outer gate plate are driven to move up at a faster speed by the differential speed driving mechanism when the outer gate plate moves up, so that the two inner gate plates move to the inner side of the outer gate plate, and the lower ends of the two inner gate plates are not aligned with the lower end of the outer gate plate, so that the sand and stone particles in the oil directly impact the outer gate plate and do not directly impact the two inner gate plates, thereby preventing the lower end edges of the inner gate plates from being worn by the sand and stone particles, ensuring the integrity of the lower end edges of the two inner gate plates after long-term use, and ensuring the sealing effect between the inner gate plates and the sealing strip, preventing the gate valve from leaking, and improving the use reliability of the gate valve.

[0019] Secondly, the two inner gate plates are separated when moving up to the inner sides of the two receiving grooves by the opening and closing guide mechanism, so that the two inner gate plates are respectively attached to the inner sides of the two receiving grooves, the receiving grooves can further block the sand and stone particles flowing to impact the inner gate plates, thereby further protecting the inner gate plates from being worn and further improving the sealing performance of the gate valve after long-term use.

[0020] Thirdly, the two baffles in the baffle mechanism provided at the lower ends of the two receiving grooves can be rotated to a horizontal angle when the two inner gate plates move up to the inner sides of the two receiving grooves, so as to block the lower ends of the two receiving grooves, thereby achieving a certain sealing effect, blocking the sand and stone particles in the oil from entering the inner sides of the two receiving grooves, and further preventing the sand and stone particles from impacting the two inner gate plates, thereby further protecting the inner gate plates from being worn. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed in the description of the specific embodiments or prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0022] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0023] Figure 2 is a schematic diagram of the first cross-sectional structure of the present application;

[0024] Figure 3 is a schematic diagram of the second cross-sectional structure of the present application;

[0025] Figure 4 is a schematic diagram of the cross-sectional structure of the outer gate in the present application;

[0026] Figure 5 is a schematic diagram of the Figure 3 enlarged structure of position A in the present application;

[0027] Figure 6 is a schematic diagram of the guide groove on the inner side of the valve body in the present application;

[0028] Figure 7 is a schematic diagram of the disassembled structure of the two inner gates in the present application;

[0029] Figure 8 is a schematic diagram of the structure when the outer gate and the inner gate are opened in the present application.

[0030] Reference signs:

[0031] 1, valve body; 2, liquid inlet pipe; 3, liquid outlet pipe; 4, top cover; 5, outer gate; 6, inner gate; 7, sliding plate; 8, storage groove; 9, guide sliding bar; 10, guide sliding groove; 11, sealing strip; 101, side rack; 102, gear; 103, double-sided rack; 104, gear shaft; 105, through hole; 201, lifting screw; 202, internally threaded sleeve; 203, sleeve gear; 204, driving gear; 205, rotating disc; 301, sliding pin; 302, lower vertical groove; 303, inclined groove; 304, upper vertical groove; 401, folding groove; 402, connecting plate; 403, baffle shaft; 404, baffle; 405, torsion spring; 406, movable limit baffle; 407, fixed limit baffle. DETAILED DESCRIPTION

[0032] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] This invention provides an improved wear-resistant particle gate valve specifically for oil extraction. The technical solution of this invention is as follows:

[0034] like Figures 1 to 8 As shown, this embodiment of the invention provides a wear-resistant particle gate valve for oil extraction, including a valve body 1 connected to an inlet pipe 2 and an outlet pipe 3. An outer gate 5 is slidably connected to the inner side of the valve body 1. Two inner gates 6 are movably connected to the inner side of the outer gate 5 via a differential drive mechanism. A sealing strip 11 is provided at the bottom inner side of the valve body 1 corresponding to the positions of the two inner gates 6. The differential drive mechanism drives the outer gate 5 and the two inner gates 6 to move up and down at unequal speeds. The differential drive mechanism includes two side racks 101 fixed on both sides inside the valve body 1, two receiving grooves 8 opened on both sides inside the outer gate 5, and two gears 102 rotatably disposed on both sides of the outer gate 5. The inner sides of the two receiving grooves 8 slide... The system includes a sliding plate 7, with a double-sided rack 103 fixed to the upper side of the sliding plate 7, passing through the outer gate plate 5. Two inner gate plates 6 are slidably connected to the lower side of the sliding plate 7. The two sides of the double-sided rack 103 mesh with one side of the two gears 102, and the two side racks 101 mesh with the other side of the two gears 102. Through holes 105 are provided on both sides of the outer gate plate 5 at the positions corresponding to the two gears 102. Gear shafts 104 are rotatably connected to the inner side of the two through holes 105, and the two gear shafts 104 are respectively fixed inside the two gears 102. The system also includes: an opening and closing drive mechanism for driving the outer gate plate 5 to move up and down; and an opening and closing guide mechanism for driving the two inner gate plates 6 to merge and separate.

[0035] Furthermore, the opening and closing guide mechanism includes two sliding pins 301 that are rotatably connected through the two inner gate plates 6 (e.g., Figure 7 As shown), two guide grooves are formed on both sides inside the valve body 1. The two ends of the two sliding pins 301 are respectively movably engaged with the inner sides of the two guide grooves. The guide grooves include a lower vertical groove 302 formed on the inner side of the valve body 1 (as shown). Figure 6 As shown), there are two parallel upper vertical grooves 304 and two symmetrically arranged inclined grooves 303. One end of each of the two upper vertical grooves 304 is smoothly connected to one end of each of the two inclined grooves 303. The other end of each of the two inclined grooves 303 is smoothly connected to the upper end of the lower vertical groove 302. The width of the lower vertical groove 302 is twice the width of the inclined grooves 303 and the upper vertical grooves 304.

[0036] When the two inner gate plates 6 drive the two sliding pins 301 to move upwards, the two sliding pins 301 move from the inner side of the lower vertical groove 302 to the inner side of the two inclined grooves 303 respectively, and then move to the inner side of the two upper vertical grooves 304 respectively. Under the guidance of the two symmetrically arranged inclined grooves 303, the two sliding pins 301 will move synchronously and reversely, and the two sliding pins 301 will drive the two inner gate plates 6 to separate respectively, so that the two inner gate plates 6 move transversely to the inner side of the two storage grooves 8 respectively, and one side of the two inner gate plates 6 is close to the side of the two storage grooves 8 respectively. The storage groove 8 can provide a certain protection effect for the inner gate plate 6 on the inner side, reducing the impact of sand particles directly on the inner gate plate 6.

[0037] Further, the lower side of the sliding plate 7 is provided with a plurality of guide sliding grooves 10, and the upper end of the two inner gate plates 6 is fixed with a plurality of guide sliding strips 9 which are slidably connected with the inner side of the guide sliding grooves 10.

[0038] Through the sliding cooperation between the guide sliding strips 9 and the guide sliding grooves 10, the inner gate plate 6 can move transversely along the lower side of the sliding plate 7, improving the stability of the opening and closing movement of the inner gate plate 6, so that the inner gate plate 6 can completely fit the inner side of the storage groove 8.

[0039] Further, the opening and closing driving mechanism comprises a top cover 4 fixed on the top end of the valve body 1, two inner threaded sleeves 202 rotatably connected on the upper side of the top cover 4, two lifting screws 201 threadedly connected on the inner side of the two inner threaded sleeves 202 and penetrating through the top cover 4, the lower ends of the two lifting screws 201 are fixedly connected with the upper end of the outer gate plate 5, the outer sides of the two inner threaded sleeves 202 are fixedly provided with sleeve gears 203, the upper side of the top cover 4 is rotatably connected with a driving gear 204 engaged with the two sleeve gears 203, and the upper end of the driving gear 204 is fixedly provided with a rotating disc 205.

[0040] By rotating the rotating disc 205 to drive the driving gear 204 to rotate, the driving gear 204 drives the two sleeve gears 203 to rotate synchronously through the engagement of the teeth, and the two sleeve gears 203 drive the two inner threaded sleeves 202 to rotate synchronously respectively. Since the two lifting screws 201 do not rotate, the two inner threaded sleeves 202 rotate to drive the two lifting screws 201 to move linearly up and down through the threads respectively, and the two lifting screws 201 drive the lower end of the outer gate plate 5 to move up and down, thereby realizing the opening and closing of the gate valve.

[0041] Further, the lower end of the two storage grooves 8 is provided with a baffle mechanism for sealing, which comprises two folding grooves 401 (as shown in the figure) formed at the lower end of the two storage grooves 8. Figure 5As shown in the figure, the side of the two folding grooves 401 is fixed with a connecting plate 402 at the upper end position, the outer side of the two connecting plates 402 is rotatably connected with a baffle 404 through a baffle shaft 403, and the two ends of the two connecting plates 402 are elastically connected with the two baffles 404 through a torsion spring 405 respectively, the side of the two folding grooves 401 is fixed with a fixed limiting baffle 407 at the upper side position, and the upper side of the two baffles 404 is fixed with a movable limiting baffle 406 rotating with the baffle 404;

[0042] When the two inner gate plates 6 are moved to the inner side of the two storage grooves 8, the surface of the two inner gate plates 6 no longer blocks the lower side of the two baffles 404, and under the action of the torsion spring 405, the two baffles 404 are simultaneously rotated to the horizontal direction. Since the upper side of the two baffles 404 is fixed with the movable limiting baffle 406, when the baffle 404 is rotated to the horizontal angle, the movable limiting baffles 406 on the upper side of the two baffles 404 are in contact with the fixed limiting baffles 407 on the upper side of the two folding grooves 401 respectively, thereby preventing the two baffles 404 from continuing to rotate, and the two baffles 404 are simultaneously at the horizontal angle, as shown in the figure. At this time, the two baffles 404 can seal the two storage grooves 8, thereby preventing the sand particles in the oil from entering the inner side of the two storage grooves 8, thereby further avoiding the impact of the sand particles on the two inner gate plates 6, further protecting the inner gate plates 6 from being worn, and prolonging the service life of the gate valve. Figure 8

[0043] Further, the two surfaces of the two inner gate plates 6 in contact with each other are both frosted surfaces;

[0044] It can prevent the two inner gate plates 6 from being fully attached to each other, and air can enter between the two frosted surfaces, which helps to balance the air pressure inside and outside the two inner gate plates 6, prevents the two inner gate plates 6 from being attracted, and ensures that the two inner gate plates 6 can stably separate and enter the storage groove 8.

[0045] Working principle: when used, the gate valve is connected to the oil extraction wellhead pipeline through the liquid inlet pipe 2 and the liquid outlet pipe 3, when the gate valve is closed, the lower end of the outer gate plate 5 and the two inner gate plates 6 are aligned, the lower end of the outer gate plate 5 is tightly abutted with the inner bottom end of the valve body 1, and the lower end of the two inner gate plates 6 is tightly abutted with the sealing strip 11, the oil in the wellhead pipeline is blocked by the two side surfaces of the outer gate plate 5, and the oil leakage in the wellhead pipeline is blocked by the sealing action between the two inner gate plates 6 and the sealing strip 11;

[0046] ​When it is necessary to open the wellhead pipe, it is necessary to rotate the rotating disc 205 of the opening and closing driving mechanism, which drives the main gear 204 to rotate, and the main gear 204 drives the two sleeve gears 203 to rotate synchronously through the meshing of the teeth, and the two sleeve gears 203 drive the two internally threaded sleeves 202 to rotate synchronously, and since the two lifting screws 201 cannot rotate, the two internally threaded sleeves 202 drive the two lifting screws 201 to move up and down linearly through the threads when rotating, and the two lifting screws 201 drive the outer gate plate 5 at the lower end to move up and down, when the outer gate plate 5 moves upward, the lower end of the outer gate plate 5 gradually separates from the inner bottom end of the valve body 1, and the outer gate plate 5 drives the two gears 102 and the two gear shafts 104 inside it to move upward at the same time, when the two gears 102 move upward, the two gears 102 mesh with the two side racks 101 through the teeth, respectively, so that the two gears 102 can rotate at a constant speed in opposite directions, since the two gears 102 can drive the double-sided rack 103 to move upward synchronously with the outer gate plate 5, and the two gears 102 mesh with the double-sided rack 103 on both sides through the teeth, respectively, so that the rotation of the two gears 102 drives the double-sided rack 103 to move upward, therefore, the speed of the double-sided rack 103 moving upward can be greater than the speed of the outer gate plate 5 moving upward, and the double-sided rack 103 drives the two inner gate plates 6 to move upward synchronously through the sliding plate 7, therefore, the speed of the two inner gate plates 6 moving upward is also greater than the speed of the outer gate plate 5 moving upward, therefore, when the outer gate plate 5 is driven to move upward, the two inner gate plates 6 can be driven to move to the inner side of the outer gate plate 5 at a faster speed, achieving the effect of differential drive, when the lower end of the outer gate plate 5 separates from the inner bottom end of the valve body 1, a gap is formed, at this time, the oil in the wellhead pipe flows through the lower end of the outer gate plate 5 at a very fast flow rate, at this time, the sand and stone particles mixed in the oil will impact the two side surfaces and the lower end edge position of the outer gate plate 5, since the two inner gate plates 6 move to the inner side of the outer gate plate 5, the sand and stone particles will not directly impact the two inner gate plates 6, thereby preventing the lower end edge of the inner gate plate 6 from being worn by the sand and stone particles, and ensuring the integrity of the lower end edge of the inner gate plate 6 after long-term use, thereby ensuring the sealing effect between the inner gate plate 6 and the sealing strip 11, preventing the gate valve from leaking, and improving the use reliability of the gate valve;

[0047] The two inner gate plates 6 move simultaneously to drive the two slide pins 301 in the opening and closing guide mechanism. When the two inner gate plates 6 have not moved to the inside of the two receiving grooves 8, the two slide pins 301 are simultaneously inside the lower vertical grooves 302. When the two inner gate plates 6 move upward to the inside of the two receiving grooves 8, the two slide pins 301 are simultaneously moved from the inside of the lower vertical grooves 302 to the inside of the two inclined grooves 303, and then to the inside of the two upper vertical grooves 304. Under the guidance of the two symmetrically arranged inclined grooves 303, the two slide pins 301 are synchronously and reversely moved, and the two inner gate plates 6 are separated and moved horizontally to the inside of the two receiving grooves 8, so that one side of each inner gate plate 6 is close to the side of the two receiving grooves 8, as shown in the state of Figure 8 The two inner gate plates 6 are located inside the two receiving grooves 8, and the two receiving grooves 8 can further protect the two inner gate plates 6 and effectively avoid the impact of sand particles in the oil on the lower end edges of the inner gate plates 6, thereby further protecting the inner gate plates 6 from being worn and improving the sealing performance of the gate valve after long-term use.

[0048] To further improve the protection effect of the inner gate plates 6, the baffle mechanism is arranged. When the two inner gate plates 6 have not completely moved to the inside of the two receiving grooves 8, the two baffles 404 in the baffle mechanism are rotated under the elastic force of the torsion springs 405, and the two baffles 404 are opposite in rotational torque, so that the lower sides of the two baffles 404 are respectively attached to the two surfaces of the inner gate plates 6 that are not in contact, as shown in Figure 5 When the two inner gate plates 6 are completely moved to the inside of the two receiving grooves 8, the surfaces of the two inner gate plates 6 no longer block the lower sides of the two baffles 404, and the two baffles 404 are simultaneously rotated in the horizontal direction under the action of the torsion springs 405. Since the upper sides of the two baffles 404 are fixed with the movable limiting baffles 406, when the baffles 404 are rotated to the horizontal angle, the movable limiting baffles 406 on the upper sides of the two baffles 404 are respectively in contact with the fixed limiting baffles 407 on the upper sides of the two folding grooves 401, thereby preventing the two baffles 404 from continuing to rotate, and the two baffles 404 are simultaneously at the horizontal angle, as shown in the state of Figure 8 The two baffles 404 can seal the two receiving grooves 8, thereby blocking the sand particles in the oil from entering the inside of the two receiving grooves 8, thereby further avoiding the impact of the sand particles on the two inner gate plates 6, further protecting the inner gate plates 6 from being worn, and prolonging the service life of the gate valve.

[0049] In order to further improve the service life of the gate valve, wear-resistant particles mixed with a binder can also be attached to the surface of the outer gate plate 5 by a sintering process, which can be ceramic or metal powder, which has high wear resistance. When the ceramic or metal powder is attached to the surface of the outer gate plate 5 by high-temperature sintering, the wear resistance of the outer gate plate 5 can be greatly improved, thereby effectively reducing the wear of the outer gate plate 5.

[0050] The above description enables one of ordinary skill in the art to make and use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wear-resistant particle gate valve for oil extraction, comprising a valve body (1) connected to an inlet pipe (2) and an outlet pipe (3), characterized in that, An outer gate (5) is slidably connected to the inner side of the valve body (1). Two inner gates (6) are movably connected to the inner side of the outer gate (5) through a differential drive mechanism. The differential drive mechanism drives the outer gate (5) and the two inner gates (6) to move up and down at different speeds. The differential drive mechanism includes two side racks (101) fixed inside the valve body (1) on both sides, two storage slots (8) opened inside the outer gate (5) on both sides, and two gears (102) rotatably set on both sides of the outer gate (5). A slide plate (7) is slidably connected to the inner side of the two storage slots (8). A double-sided rack (103) penetrating the outer gate (5) is fixed on the upper side of the slide plate (7). Two inner gates (6) are slidably connected to the lower side of the slide plate (7). The two sides of the double-sided rack (103) mesh with one side of the two gears (102) respectively, and the two side racks (101) mesh with the other side of the two gears (102) respectively. Also includes: An opening and closing drive mechanism that drives the outer gate (5) to move up and down; An opening and closing guide mechanism that drives the merging and separation of the two inner gates (6); The opening and closing guide mechanism includes two sliding pins (301) that are rotatably connected inside the two inner gates (6) and two guide grooves opened on both sides inside the valve body (1). The two ends of the two sliding pins (301) are respectively in movable cooperation with the inner side of the two guide grooves. The guide groove includes a lower vertical groove (302) opened inside the valve body (1), two parallel upper vertical grooves (304), and two symmetrically arranged inclined grooves (303). One end of the two upper vertical grooves (304) is smoothly connected to one end of the two inclined grooves (303), and the other end of the two inclined grooves (303) is smoothly connected to the upper end of the lower vertical groove (302). The width of the lower vertical groove (302) is twice the width of the inclined grooves (303) and the upper vertical grooves (304).

2. The wear-resistant particle gate valve for oil extraction as described in claim 1, characterized in that: Multiple guide grooves (10) are provided on the lower side of the slide plate (7), and multiple guide strips (9) that are slidably connected to the inner side of the guide grooves (10) are fixed on the upper ends of the two inner gates (6).

3. The wear-resistant particle gate valve for oil extraction as described in claim 1, characterized in that: The outer gate (5) has through holes (105) on both sides corresponding to the positions of the two gears (102). The inner sides of the two through holes (105) are rotatably connected to gear shafts (104), and the two gear shafts (104) are respectively fixed inside the two gears (102).

4. The wear-resistant particle gate valve for oil extraction as described in claim 1, characterized in that: The opening and closing drive mechanism includes a top cover (4) fixed to the top of the valve body (1). Two internal threaded sleeves (202) are rotatably connected to the upper two ends of the top cover (4). The inner sides of the two internal threaded sleeves (202) are threaded with lifting screws (201) that penetrate the top cover (4). The lower ends of the two lifting screws (201) are fixedly connected to the upper end of the outer gate (5). Sleeve gears (203) are fixed to the outer sides of the two internal threaded sleeves (202). The upper side of the top cover (4) is rotatably connected to a drive gear (204) that meshes with the two sleeve gears (203). A turntable (205) is fixed to the upper end of the drive gear (204).

5. The wear-resistant particle gate valve for oil extraction as described in claim 1, characterized in that: The lower ends of the two storage slots (8) are provided with a baffle mechanism for sealing. The baffle mechanism includes two folding slots (401) opened at the lower ends of the two storage slots (8). The sides of the two folding slots (401) are fixed with connecting plates (402) at the upper positions. The outer sides of the two connecting plates (402) are rotatably connected to a baffle (404) through a baffle shaft (403). The two ends of the two connecting plates (402) are elastically connected to the two baffles (404) respectively through torsion springs (405).

6. The wear-resistant particle gate valve for oil extraction as described in claim 5, characterized in that: Fixed limiting baffles (407) are fixed on the upper side of the two folding slots (401), and movable limiting baffles (406) are fixed on the upper side of the two baffles (404) as the baffles (404) rotate.

7. The wear-resistant particle gate valve for oil extraction as described in claim 1, characterized in that: A sealing strip (11) is provided at the bottom inner side of the valve body (1) corresponding to the positions of the two inner gates (6).

8. The wear-resistant particle gate valve for oil extraction as described in claim 1, characterized in that: Both surfaces of the two inner gates (6) that come into contact with each other are frosted.

Images