阅读说明：本技术 一种天然气脱汞分离器 (Natural gas demercuration separator ) 是由 王涛 于 2019-12-23 设计创作，主要内容包括：一种天然气脱汞分离器,包括两个分离器本体,两个分离器本体左右分布,每个分离器本体内均设有两组导向结构,位于同一个分离器本体内的两组导向结构前后分布,每组导向结构均由三根光杆与一根丝杆组成,每组导向结构内的光杆与丝杆呈矩形分布,位于同一个分离器本体内的其中一根丝杆的底端下方均设有一个防水电机,防水电机位于分离器本体的下方。本发明结构简单,使用操作便捷,本装置通过设置两个分离器本体,能够使两个分离器本体分别对天然气进行脱汞处理,其中一个分离器本体内的吸附板对天然气进行脱汞处理时,另外一个分离器本体将脱完汞的天然气进行排出,通过两个分离器本体交替工作,节约了脱汞时间,增加了脱汞效率。(The utility model provides a natural gas demercuration separator, including two separator bodies, distribute about two separator bodies, every separator is this internal all to be equipped with two sets of guide structure, distribute around being located this internal two sets of guide structure of same separator, every guide structure of group comprises three polished rods and a lead screw, polished rod and lead screw in every guide structure of group are the rectangle and distribute, the bottom below that is located this internal one of them lead screw of same separator all is equipped with a waterproof motor, waterproof motor is located the below of separator body. The natural gas demercuration device is simple in structure and convenient and fast to use and operate, the two separator bodies can be used for performing demercuration treatment on natural gas respectively through the two separator bodies, when the natural gas is subjected to demercuration treatment through the adsorption plate in one separator body, the natural gas after demercuration is discharged through the other separator body, and the two separator bodies work alternately, so that demercuration time is saved, and demercuration efficiency is improved.)

1. A demercuration separator for natural gas is characterized in that: comprises two separator bodies (1), the two separator bodies (1) are distributed left and right, two groups of guide structures are arranged in each separator body (1), the two groups of guide structures in the same separator body (1) are distributed front and back, each group of guide structures consists of three polished rods (2) and a lead screw (3), the polished rods (2) and the lead screws (3) in each group of guide structures are distributed in a rectangular shape, a waterproof motor (4) is arranged below the bottom end of one lead screw (3) in the same separator body (1), the waterproof motor is arranged below the separator body, the top surface of each waterproof motor (4) is fixedly connected with the outer wall of the bottom surface of the corresponding separator body (1), a first gear (5) is fixedly arranged at the top end of a rotating shaft of each waterproof motor (4), and a second gear (31) is fixedly arranged at the bottom end of the other lead screw (3), each second gear (31) is movably connected with the inner wall of the bottom surface of a corresponding separator body (1), the first gear (5) and the second gear (31) which are positioned in the same separator body (1) are mutually meshed, the top end of each lead screw (3) is connected with the inner wall of the top surface of the separator body (1) through a bearing, the periphery of each lead screw (3) is in threaded fit with a nut (6), the periphery of each polished rod (2) is sleeved with a guide sleeve (7), the guide sleeves (7) can move up and down along the polished rod (2), the nuts (6) positioned in the same group of guide structures are fixedly connected with the adjacent guide sleeve (7) and the other two guide sleeves (7) through a strip-shaped block (8), the two strip-shaped blocks (8) in each group of guide structures are distributed back and forth, the opposite surfaces of the two strip-shaped blocks (8) in each group of guide structures are provided with a strip-shaped groove (9), one side of each strip-shaped groove (9) is communicated with the outside, one end of a guide rod (10) is fixedly connected in each strip-shaped groove (9), the other end of each guide rod (10) is provided with a jack (11), one side of each strip-shaped block (8) is fixedly connected with one end of a fixed rod (12), the periphery of the other end of each fixed rod (12) is sleeved with an L-shaped rod (13), the L-shaped rod (13) can move along the fixed rod (12), one side of the L-shaped rod (13) is fixedly connected with one end of a first spring (14), the other end of the first spring (14) is fixedly connected with the strip-shaped block (8), one end of the L-shaped rod (13) can be inserted into the jack (11), two sliders (15) are arranged in each strip-shaped groove (9), one side of each slider (15) is provided with a through hole (16), the guide rods (10) pass through the through holes (16), the slide blocks (15) can move along the corresponding guide rods (10), four slide blocks (15) positioned in the same group of guide structures are fixedly connected through an adsorption plate (17), the inner wall of the top surface of each separator body (1) is provided with a feed inlet (18), the feed inlets are fixedly connected with one end of a connecting pipe, the inner wall of the bottom surface of each separator body (1) is provided with a discharge outlet (19), the bottom end of one side of each separator body (1) is provided with two rectangular through grooves (20), the two rectangular through grooves (20) positioned on the same separator body (1) are distributed front and back, each rectangular through groove (20) is internally hinged with a cover plate (21), the front end and the back end of each cover plate (21) are provided with a cavity (22), one side of each cavity (22) is provided with a through groove, each cavity (22) is internally provided with an insertion plate (23), the one end of every picture peg (23) all passes through the groove, the other end inner wall fixed connection of the other end of every picture peg (23) all through a second spring (24) and cavity (22), two bars are all seted up in the front of every apron (21) and are passed through groove (25), it distributes around two bars that are located on same apron (21) are passed through groove (25), every bar is passed through and all is equipped with a fixed block (26) in groove (25), the one end of every fixed block (26) all with a picture peg (23) fixed connection that corresponds, a rectangle slot (27) is all seted up to the front and back both ends inner wall that every rectangle passed through groove (20), the one end homoenergetic of every picture peg (23) is inserted in a rectangle slot (27) that corresponds.

2. The natural gas demercuration separator of claim 1, wherein: two sides and upper and lower two sides of each cover plate (21) are fixedly provided with a sealing gasket (28), and the sealing gaskets (28) have elasticity.

3. The natural gas demercuration separator of claim 1, wherein: one side of each inserting plate (23) is fixedly provided with a rubber pad (29).

4. The natural gas demercuration separator of claim 1, wherein: the other end of each fixed rod (12) is fixedly provided with a limiting block (30) with a circular section, and the diameter of the limiting block (30) is larger than that of the L-shaped rod (13).

5. The natural gas demercuration separator of claim 1, wherein: the waterproof motor (4) is a stepping motor.

6. The natural gas demercuration separator of claim 1, wherein: the two adsorption plates (17) in the same separator body (1) are made of different materials, one is made of a metal sulfide material, and the other is made of sulfur-carrying activated carbon.

Technical Field

The invention belongs to the field of natural gas demercuration, and particularly relates to a natural gas demercuration separator.

Background

Along with the development of a large amount of global natural gas resources and the application of natural gas as clean energy in industry and civilian use, the natural gas plays an increasingly important role in the energy field, the natural gas demercuration process becomes an important component of natural gas processing and treatment, the existing natural gas demercuration separator mostly adopts single-tower separation, the demercuration efficiency is low, adsorption plates are mostly fixedly installed, natural sedimentation is adopted during demercuration, the demercuration time is long, the demercuration effect is poor, meanwhile, the adsorption plates are not easy to replace and clean, and inconvenience is brought to use.

Disclosure of Invention

The invention provides a natural gas demercuration separator, which is used for overcoming the defects in the prior art.

The invention is realized by the following technical scheme:

a natural gas demercuration separator comprises two separator bodies which are distributed on the left and right, two groups of guide structures are arranged in each separator body, the two groups of guide structures in the same separator body are distributed on the front and back, each group of guide structures consists of three polished rods and a lead screw, the polished rods and the lead screws in each group of guide structures are distributed in a rectangular mode, a waterproof motor is arranged below the bottom end of one lead screw in the same separator body and located below the separator body, the top surface of each waterproof motor is fixedly connected with the outer wall of the bottom surface of the corresponding separator body, a first gear is fixedly arranged at the top end of a rotating shaft of each waterproof motor, a second gear is fixedly arranged at the bottom end of the other lead screw and movably connected with the inner wall of the bottom surface of the corresponding separator body, the first gear and the second gear which are positioned in the same separator body are mutually meshed, the top end of each lead screw is connected with the inner wall of the top surface of the separator body through a bearing, the periphery of each lead screw is in threaded fit with a nut, the periphery of each polished rod is sleeved with a guide sleeve, the guide sleeve can move up and down along the polished rod, the nuts positioned in the same group of guide structures are fixedly connected with an adjacent guide sleeve and the other two guide sleeves through a strip-shaped block, the two strip-shaped blocks in each group of guide structures are distributed front and back, the opposite surfaces of the two strip-shaped blocks in each group of guide structures are respectively provided with a strip-shaped groove, one side of each strip-shaped groove is communicated with the outside, one end of a guide rod is fixedly connected in each strip-shaped groove, the other end of each guide rod is provided with a jack, one side of each strip-shaped block is fixedly connected with one, an L-shaped rod is sleeved on the periphery of the other end of each fixed rod and can move along the fixed rods, one side of each L-shaped rod is fixedly connected with one end of a first spring, the other end of each first spring is fixedly connected with a strip-shaped block, one end of each L-shaped rod can be inserted into a jack, two sliders are arranged in each strip-shaped groove, a through hole is formed in one side of each slider, a guide rod penetrates through the through hole, the sliders can move along the corresponding guide rod, the four sliders in the same group of guide structures are fixedly connected through an adsorption plate, a feed inlet is formed in the inner wall of the top surface of each separator body and is fixedly connected with one end of a connecting pipe, a discharge outlet is formed in the inner wall of the bottom surface of each separator body, two rectangular through grooves are formed in the bottom end of one side of each separator body and are distributed in the front and back of the two rectangular through grooves on the same separator, every rectangle passes through an equal hinged joint apron of inslot, a cavity is all seted up at both ends around every apron, one side of every cavity is all seted up one and is passed the groove, all be equipped with an picture peg in every cavity, the one end of every picture peg all passes through the groove, the other end of every picture peg all passes through the other end inner wall fixed connection of a second spring and cavity, two bars in the front of every apron are all seted up and are passed the groove, be located two bars on the same apron and pass through the groove front and back and distribute, every bar is passed all to be equipped with a fixed block in the groove, the one end of every fixed block all with a picture peg fixed connection that corresponds, a rectangle slot is all seted up to both ends inner wall around every rectangle passes through the groove, the one end homoenergetic of every picture peg inserts a rectangle slot that corresponds.

According to the natural gas demercuration separator, the sealing gaskets are fixedly arranged on the two side faces and the upper face and the lower face of each cover plate, and the sealing gaskets have elasticity.

According to the natural gas demercuration separator, one side of each inserting plate is fixedly provided with one rubber pad.

According to the natural gas demercuration separator, the other end of each fixed rod is fixedly provided with a limiting block with a circular section, and the diameter of the limiting block is larger than that of the L-shaped rod.

According to the natural gas demercuration separator, the waterproof motor is a stepping motor.

According to the natural gas demercuration separator, the two adsorption plates in the same separator body are made of different materials, one adsorption plate is made of a metal sulfide material, and the other adsorption plate is made of sulfur-carrying activated carbon.

The invention has the advantages that: the invention has simple structure and convenient use and operation, when the invention is used, firstly, natural gas is respectively added into two separator bodies through a feed inlet, then the waterproof motor works, a rotating shaft of the waterproof motor rotates to drive a first gear to rotate, the first gear rotates to drive a second gear to rotate reversely, the first gear and the second gear rotate to drive a screw rod to rotate, a nut is in threaded connection with the screw rod, a strip-shaped block limits the rotation of the nut, two nuts positioned in the same separator body move reversely up and down along the screw rod, the nut moves to drive a corresponding strip-shaped block to move, the strip-shaped block moves to drive a corresponding adsorption plate to move, the adsorption plate moves to drive a corresponding guide sleeve to move, two adsorption plates positioned in the same separator body move reversely, namely, the adsorption plates move up and down, the adsorption plates carry out demercuration treatment on the natural gas, when the adsorption plates need to be taken out for cleaning, firstly, respectively moving an adsorption plate to the bottom of a separator body, then relatively moving two fixed blocks on the same cover plate, moving the fixed blocks to relatively move two plug boards on the same cover plate, compressing a second spring, moving the plug boards out of a rectangular slot, upwards turning the cover plate by taking a hinged point of the cover plate and a strip-shaped through slot as a turning center, then pulling an L-shaped rod to move one end of the L-shaped rod out of a jack, compressing a first spring, then rotating the L-shaped rod, outwards pulling the adsorption plate, moving the adsorption plate to drive a sliding block to outwards move along a guide rod, taking the adsorption plate out of the separator body, cleaning and replacing the adsorption plate, after cleaning, then enabling the guide rod to pass through a through hole, inwards pushing the adsorption plate to enable the sliding block to inwards move along the guide rod, then rotating the L-shaped rod, enabling one end of the L-shaped rod to be inserted into the jack under the elastic force of the first spring, then the cover plate is turned downwards, the fixed block is loosened, under the action of the elastic force of the second spring, the inserting plate is inserted into the rectangular slot, the replacement and the cleaning of the adsorption plate are completed, the device can enable the two separator bodies to respectively carry out mercury removal treatment on natural gas by arranging the two separator bodies, when the adsorption plate in one separator body carries out mercury removal treatment on the natural gas, the other separator body discharges the natural gas after mercury removal, the two separator bodies alternately work, the mercury removal time is saved, the mercury removal efficiency is increased, meanwhile, the two adsorption plates are arranged in each separator body, and the adsorption plates reversely move, when the adsorption plates move, the device has a stirring effect on the natural gas, the contact area between the adsorption plates and the natural gas is increased, the mercury removal of the natural gas is more rapid, and the mercury removal efficiency of the natural gas is improved, meanwhile, the adsorption plate in the device is movably mounted, so that the adsorption plate is convenient to replace and clean, and convenience is brought to use.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention; FIG. 2 is an enlarged view of the view from the direction A of FIG. 1; FIG. 3 is a view from the direction B of FIG. 1; FIG. 4 is a view in the direction C of FIG. 1; FIG. 5 is an enlarged view of the view of FIG. 2 taken along line D; FIG. 6 is an enlarged view of the structure of the cover plate; FIG. 7 is an enlarged view of the view of FIG. 2 from direction E; FIG. 8 is an enlarged view of the view of FIG. 4 in the direction F; fig. 9 is a partial enlarged view of i of fig. 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A natural gas demercuration separator comprises two separator bodies 1, wherein the two separator bodies 1 are distributed on the left and right, two groups of guide structures are arranged in each separator body 1, the two groups of guide structures in the same separator body 1 are distributed in the front and back, each group of guide structures consists of three polished rods 2 and a lead screw 3, the polished rods 2 and the lead screws 3 in each group of guide structures are distributed in a rectangular mode, a waterproof motor 4 is arranged below the bottom end of one lead screw 3 in the same separator body 1 and is positioned below the separator body, the top surface of each waterproof motor 4 is fixedly connected with the outer wall of the bottom surface of the corresponding separator body 1, the bottom end of each lead screw penetrates through the separator body and is connected with the separator body through a sealing bearing, and a first gear 5 is fixedly mounted at the top end of the rotating shaft of each waterproof motor 4, a second gear 31 is fixedly arranged at the bottom end of another lead screw 3, each second gear 31 is movably connected with the inner wall of the bottom surface of a corresponding separator body 1, a first gear 5 and the second gear 31 which are positioned in the same separator body 1 are mutually meshed, the top end of each lead screw 3 is connected with the inner wall of the top surface of the separator body 1 through a bearing, the periphery of each lead screw 3 is in threaded fit with a nut 6, the periphery of each polished rod 2 is sleeved with a guide sleeve 7, the guide sleeves 7 can move up and down along the polished rods 2, the nuts 6 positioned in the same group of guide structures are fixedly connected with the adjacent guide sleeves 7 and the other two guide sleeves 7 through a strip-shaped block 8, the two strip-shaped blocks 8 in each group of guide structures are distributed back and forth, the opposite surfaces of the two strip-shaped blocks 8 in each group of guide structures are provided with a strip-shaped groove 9, one side of each strip-shaped groove 9 is communicated with the outside, one end of a guide rod 10 is fixedly connected in each strip-shaped groove 9, the other end of each guide rod 10 is provided with a jack 11, one side of each strip-shaped block 8 is fixedly connected with one end of a fixed rod 12, the periphery of the other end of each fixed rod 12 is sleeved with an L-shaped rod 13, the L-shaped rod 13 can move along the fixed rod 12, one side of the L-shaped rod 13 is fixedly connected with one end of a first spring 14, the other end of the first spring 14 is fixedly connected with the strip-shaped block 8, one end of the L-shaped rod 13 can be inserted into the jack 11, each fixed rod 12 passes through the corresponding longitudinal rod of the L-shaped rod 13, one end of the transverse rod of each L-shaped rod 13 is inserted into the jack 11, two sliders 15 are arranged in each strip-shaped groove 9, one side of each slider 15 is provided with a through hole 16, the guide rods 10 pass through, the sliding blocks 15 can move along the corresponding guide rods 10, four sliding blocks 15 in the same group of guide structures are fixedly connected through an adsorption plate 17, two sliding blocks on one side of the strip-shaped groove in the same group of guide structures are respectively contacted with the longitudinal rod of the corresponding L-shaped rod, the adsorption plate can be prevented from shaking in the up-and-down moving process, the adsorption plate can be limited between two strip-shaped blocks 8 in the group of guide structures by the tensile force of a spring, the spring can be stretched by the force of a person when the L-shaped rod is pulled outwards, a feed inlet 18 is formed in the inner wall of the top surface of each separator body 1 and is fixedly connected with one end of a connecting pipe, the other ends of the two connecting pipes are connected with a feed pipe of natural gas with a control valve, the natural gas can be firstly conveyed to one of the connecting pipes through the control valve of the natural gas and can react in the separator body, then after a period of time, conveying the natural gas into another connecting pipe, reacting in another separator body, alternately working the two separator bodies, arranging a discharge hole 19 on the inner wall of the bottom surface of each separator body 1, connecting the discharge hole 19 with a natural gas discharge pipe with a control valve, arranging two rectangular through grooves 20 at the bottom end of one side of each separator body 1, distributing the two rectangular through grooves 20 on the same separator body 1 in the front and back direction, connecting a cover plate 21 in each rectangular through groove 20 through a hinge, arranging a cavity 22 at the front end and the back end of each cover plate 21, arranging a through groove at one side of each cavity 22, arranging an insert plate 23 in each cavity 22, enabling one end of each insert plate 23 to penetrate through the through grooves, and fixedly connecting the other end of each insert plate 23 with the inner wall of the other end of the cavity 22 through a second spring 24, the groove 25 is passed through to two bars all seted up in the front of every apron 21, two bars that are located on same apron 21 are passed through groove 25 front and back and are distributed, every bar is passed through and all is equipped with a fixed block 26 in the groove 25, every fixed block 26's one end all with a picture peg 23 fixed connection that corresponds, a rectangle slot 27 is all seted up to the both ends inner wall around every rectangle passes through groove 20, the one end homoenergetic of every picture peg 23 inserts a rectangle slot 27 that corresponds, picture peg 23 inserts back in the rectangle slot 27, apron 21 passes through groove 20 in close contact with the bar, form confined space. The natural gas separator is simple in structure and convenient and fast to use and operate, firstly, natural gas is respectively added into two separator bodies 1 through a feed port 18, then a waterproof motor 4 works, a rotating shaft of the waterproof motor 4 rotates to drive a first gear 5 to rotate, the first gear 5 rotates to drive a second gear 31 to rotate reversely, the first gear 5 and the second gear 31 rotate to drive a screw rod 3 to rotate, a nut 6 is in threaded connection with the screw rod 3, a strip-shaped block 8 limits the rotation of the nut 6, two nuts 6 positioned in the same separator body 1 move in an up-down reverse direction along the screw rod 3, the nut 6 moves to drive a corresponding strip-shaped block 8 to move, the strip-shaped block 8 moves to drive a corresponding adsorption plate 17 to move, the adsorption plate 17 moves to drive a corresponding guide sleeve 7 to move, two adsorption plates 17 positioned in the same separator body 1 move in a reverse direction, namely move in an up-down direction, the adsorption plate 17 carries out demercuration treatment on the natural gas, when the adsorption plate 17 needs to be taken out and cleaned, the adsorption plate 17 is firstly respectively moved to the bottom of the separator body 1, then two fixed blocks 26 on the same cover plate 21 are relatively moved, the fixed blocks 26 are moved, two inserting plates 23 on the same cover plate 21 are relatively moved, the second spring 24 is compressed, the inserting plates 23 are moved out from the rectangular slot 27, then the cover plate 21 is upwards turned by taking the hinged point of the cover plate 21 and the strip-shaped through groove 25 as a turning center, then the L-shaped rod 13 is pulled, one end of the L-shaped rod 13 is moved out from the inserting hole 11, the first spring 14 is compressed, then the L-shaped rod 13 is rotated, the adsorption plate 17 is pulled outwards, the adsorption plate 17 moves to drive the sliding block 15 to outwards move along the guide rod 10, the adsorption plate 17 is taken out of the separator body 1 for cleaning and replacement, and after cleaning is finished, then the guide rod 10 passes through the through hole 16, the adsorption plate 17 is pushed inwards, the slide block 15 moves inwards along the guide rod 10, then the L-shaped rod 13 is rotated, one end of the L-shaped rod 13 is inserted into the jack 11 under the action of the elastic force of the first spring 14, then the cover plate 21 is turned downwards, the fixed block 26 is loosened, the inserting plate 23 is inserted into the rectangular slot 27 under the action of the elastic force of the second spring 24, the replacement and the cleaning of the adsorption plate 17 are completed, the device can enable the two separator bodies 1 to respectively carry out the demercuration treatment on the natural gas by arranging the two separator bodies 1, when the adsorption plate 17 in one separator body 1 carries out the demercuration treatment on the natural gas, the other separator body 1 discharges the natural gas after the demercuration, the two separator bodies 1 alternately work, the demercuration time is saved, the demercuration efficiency is increased, and simultaneously two adsorption plates 17 are arranged in each separator body 1, and make adsorption plate 17 reverse motion, when adsorption plate 17 moved, had the stirring effect to the natural gas, increased the area of contact of adsorption plate 17 with the natural gas, made the natural gas demercuration rapider, improved natural gas demercuration efficiency, adsorption plate 17 in this device is movable mounting simultaneously, is convenient for change and clearance adsorption plate 17, brings the convenience for the use.

Specifically, as shown in the figure, a gasket 28 is fixedly mounted on both side surfaces and both upper and lower surfaces of each cover plate 21, and the gasket 28 has elasticity. The sealing gasket 28 enables the cover plate 21 to be in closer contact with the rectangular through groove 20, natural gas leakage is avoided, and the sealing performance of the structure is improved.

Specifically, as shown in the drawings, a rubber pad 29 is fixedly mounted on one side of each inserting plate 23 in the embodiment. The rubber pad 29 has elasticity and has a buffer function, so that the inserting plate 23 can be prevented from colliding with the rectangular inserting groove 27.

Further, as shown in the drawings, a limiting block 30 with a circular cross section is fixedly installed at the other end of each fixing rod 12 in the embodiment, and the diameter of the limiting block 30 is larger than that of the L-shaped rod 13. The limiting block 30 has a limiting effect on the L-shaped rod 13, so that the L-shaped rod 13 can be prevented from being separated from the fixed rod 12, and the structural stability is improved.

Further, as shown in the figure, the waterproof motor 4 of the present embodiment is a stepping motor. The stepping motor is convenient for adjusting the rotation angle and the speed of the waterproof motor 4, so that the waterproof motor 4 can rotate more accurately.

Furthermore, as shown in the figure, the two adsorption plates 17 in the same separator body 1 of the present embodiment are made of different materials, one is made of metal sulfide material, and the other is made of sulfur-carrying activated carbon. The adsorption plates 17 made of different materials improve the efficiency of natural gas demercuration and enable the effect of natural gas demercuration to be better.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.