CN217341145U

CN217341145U - A mix curing device for chemical flooding oil recovery

Info

Publication number: CN217341145U
Application number: CN202220402703.7U
Authority: CN
Inventors: 施雷庭; 唐瑜; 丁志奇; 易龙; 李尧
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2022-09-02
Anticipated expiration: 2032-02-28

Abstract

The application discloses mix curing device for chemical flooding oil recovery, including unable adjustment base, solid fixed bin, transfer pump A, mixed structure, extrusion structure and transport structure, unable adjustment base's the fixed bin of upper surface fixedly connected with, the installation is provided with mixed structure in the inner chamber of solid fixed bin, unable adjustment base's the fixed mounting of upper surface department has transfer pump A, the installation is provided with extrusion structure in the inner chamber of solid fixed bin, unable adjustment base's the installation of upper surface department sets up transport structure. This application has mixed structure, can mix the chemical agent through mixed structure comparatively high-efficient, mixes comparatively evenly, and mixing effect is better, and this application has extrusion structure, can carry out abundant extrusion shearing to the chemical agent through extrusion structure, and then can make inside polymer micelle destroy for the curing that the chemical agent can be abundant.

Description

A mix curing device for chemical flooding oil recovery

Technical Field

The application relates to the field of chemical flooding oil production, in particular to a mixed curing device for chemical flooding oil production.

Background

Chemical flooding, also known as modified water flooding chemistry, is an oil recovery process that adds chemical agents to the injected water to change the physicochemical properties of the displacement fluid and the interfacial properties between the displacement fluid and the crude oil and rock minerals, thereby facilitating the production of crude oil.

Chemistry is driven and is mixing the chemistry agent when carrying out the during operation, and traditional mixing arrangement is when mixing the chemistry agent, and the efficiency of mixing is lower, and the not good enough of mixing appears the polymer micelle easily during the mixing simultaneously, the work such as transport in the later stage of being not convenient for simultaneously. Therefore, a mixed curing device for chemical flooding oil production is provided to solve the above problems.

Disclosure of Invention

The utility model provides a mix curing device for chemical flooding oil recovery is provided in this embodiment for solving ordinary mixing arrangement among the prior art when mixing the chemical agent, the efficiency of mixing is lower, and the not good enough of mixing appears the polymer micelle easily during the while mixes, the problem of work such as the transport in later stage of not being convenient for simultaneously.

According to one aspect of the application, a hybrid curing device for chemical flooding oil production is provided, which comprises a fixed base, a fixed bin, an infusion pump A, a hybrid structure, an extrusion structure and a conveying structure;

the improved infusion pump is characterized in that a fixed bin is fixedly connected to the upper surface of the fixed base, a mixing structure is arranged in the inner cavity of the fixed bin, an infusion pump A is fixedly arranged at the upper surface of the fixed base, an extrusion structure is arranged in the inner cavity of the fixed bin, and a conveying structure is arranged at the upper surface of the fixed base.

Further, the mixed structure includes mixing tub, spliced pole, power servo motor, rotating electrical machines, dwang and stirring vane, the one end of the equal fixedly connected with spliced pole of both sides lateral wall department of mixing tub, two the other end of spliced pole all extends to the inner chamber lateral wall department of fixed storehouse and with fixed storehouse between rotate be connected, the lateral wall department fixed mounting of fixed storehouse has power servo motor, fixed connection between power servo motor's the output shaft end and the one end of spliced pole.

Further, the upper surface department fixed mounting of tempering tank has the rotating electrical machines, the output shaft of rotating electrical machines extends to in the inner chamber of tempering tank, the one end of fixedly connected with dwang is held to the output shaft end department of rotating electrical machines, rotate between the other end of dwang and the inner chamber diapire of tempering tank and be connected, the arc wall department fixedly connected with stirring vane of dwang.

Further, the transfer pump A total a plurality of, a plurality of transfer pump A's the equal fixedly connected with coupling hose's of output end department one end, coupling hose's the other end extend to in the inner chamber of blending tank and with the blending tank between fixed connection, the last installation of coupling hose is provided with the solenoid valve.

Further, the extrusion structure includes fixed bucket, transfer pump B, coupling hose C, guide bar, sliding plate, servo drive motor and threaded rod, the fixed bucket that is provided with in the inner chamber in fixed storehouse, the equal fixedly connected with guide bar of inner chamber both sides department of fixed bucket, sliding connection has the sliding plate on the guide bar, a plurality of filtration pores have been seted up on the sliding plate.

Furthermore, a servo driving motor is fixedly mounted on the upper surface of the fixed barrel, one end of a threaded rod is fixedly connected to the tail end of an output shaft of the servo driving motor, the other end of the threaded rod extends to the bottom wall of the inner cavity of the fixed barrel and is rotatably connected with the fixed barrel, and the threaded rod penetrates through the sliding plate and is in threaded fit with the sliding plate.

Further, inner chamber wall department fixed mounting in fixed storehouse has transfer pump B, transfer pump B's input end department fixedly connected with coupling hose B's one end, coupling hose B's the other end extend to the inner chamber of blending bin in and with between the blending bin fixed connection, transfer pump B's output end department fixedly connected with coupling hose C's one end, coupling hose C's the other end extends in the inner chamber of fixed bucket, all install on coupling hose B and the coupling hose C and be provided with the solenoid valve. Further, transport structure includes connecting pipe B, carries storehouse, conveyer pipe, piston, fixed plate, rectangle fixed column, lifting slide, connecting plate, servo motor and screw thread post, unable adjustment base's upper surface department fixedly connected with carries the storehouse, the bottom surface department installation in transport storehouse is provided with the conveyer pipe, it is provided with the piston to slide in the inner chamber in transport storehouse, the upper surface department fixedly connected with fixed plate of piston.

Further, the lateral wall department fixed mounting in fixed storehouse has the transfer pump C, transfer pump C's input end department fixedly connected with connecting pipe A's one end, connecting pipe A's the other end extends to be fixed to the inner chamber of fixed bucket in, transfer pump C's output end department fixedly connected with connecting pipe B's one end, connecting pipe B's the other end extends to be fixed to the inner chamber of carrying the storehouse in, all install on connecting pipe A and the connecting pipe B and be provided with the solenoid valve.

Further, the upper surface of the conveying bin is fixedly connected with a rectangular fixing column, a lifting slider is connected in an inner cavity of the rectangular fixing column in a sliding mode, one end of a connecting plate is fixedly connected to the bottom surface of the lifting slider, the other end of the connecting plate penetrates through the conveying bin and is fixedly connected with the fixing plate, a servo motor is fixedly mounted at the upper surface of the rectangular fixing column, one end of a threaded column is fixedly connected to the tail end of an output shaft of the servo motor, the other end of the threaded column extends into the inner cavity of the rectangular fixing column, the other end of the threaded column is rotatably connected with the bottom wall of the inner cavity of the rectangular fixing column, and the threaded column penetrates through the lifting slider and is in threaded fit with the lifting slider.

Through the above-mentioned embodiment of this application, can mix chemical agent by comparatively efficient through mixed structure, it is comparatively even to mix, the mixed effect is better, this application has extrusion structure, can carry out abundant extrusion shearing to chemical agent through extrusion structure, and then can make inside polymer micelle destroy, make the curing that chemical agent can be abundant, this application has transport structure, can carry chemical agent through transport structure, the volume of the chemical agent of carrying simultaneously can carry out nimble control, can pressurize and carry, excellent in use effect, and is suitable for being generalized to use.

Drawings

In order to more clearly illustrate the embodiments of the present application 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 only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a schematic perspective view of an embodiment of the present application;

FIG. 2 is a schematic diagram of an internal structure of an embodiment of the present application;

FIG. 3 is an enlarged view of a portion of the structure at A in FIG. 2 according to an embodiment of the present application;

FIG. 4 is a schematic cross-sectional view of a mixing barrel according to an embodiment of the present application;

FIG. 5 is a schematic cross-sectional view of a stationary barrel according to an embodiment of the present application;

fig. 6 is a schematic cross-sectional view of a rectangular fixing post according to an embodiment of the present application.

In the figure: 1. a fixed base; 2. fixing the bin; 3. an infusion pump A; 4. a connecting hose; 5. a mixing barrel; 6. connecting columns; 7. a power servo motor; 8. a rotating electric machine; 9. rotating the rod; 10. a stirring blade; 11. fixing the barrel; 12. an infusion pump B; 13. a connecting hose B; 14. a connecting hose C; 15. a guide bar; 16. a sliding plate; 17. a servo drive motor; 18. a threaded rod; 19. an infusion pump C; 20. a connecting pipe A; 21. a connecting pipe B; 22. a conveying bin; 23. a delivery pipe; 24. a piston; 25. a fixing plate; 26. a rectangular fixing column; 27. a lifting slide block; 28. a connecting plate; 29. a servo motor; 30. a threaded post.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the application herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.

Referring to fig. 1-6, a mixing and curing device for chemical flooding oil production includes a fixed base 1, a fixed bin 2, an infusion pump a3, a mixing structure, an extrusion structure and a conveying structure;

the upper surface of the fixed base 1 is fixedly connected with the fixed bin 2, the inner cavity of the fixed bin 2 is provided with a mixing structure, the upper surface of the fixed base 1 is fixedly provided with an infusion pump A3, the inner cavity of the fixed bin 2 is provided with an extrusion structure, the upper surface of the fixed base 1 is provided with a conveying structure, the mixed structure can be used for efficiently mixing chemical agents, the mixing is uniform, the mixing effect is good, the extrusion structure is provided, the chemical agents can be fully extruded and sheared through the extrusion structure, then the inner polymer micelle can be damaged, the chemical agents can be fully cured, the conveying structure is provided, the chemical agents can be conveyed through the conveying structure, and meanwhile, the volume of the conveyed chemical agents can be flexibly controlled, can pressurize and convey, has good use effect and is suitable for popularization and use.

The mixing structure comprises a mixing barrel 5, connecting columns 6, power servo motors 7, rotating motors 8, rotating rods 9 and stirring blades 10, wherein one ends of the connecting columns 6 are fixedly connected to the side walls of the two sides of the mixing barrel 5, the other ends of the two connecting columns 6 extend to the inner cavity side wall of the fixed bin 2 and are rotatably connected with the fixed bin 2, the power servo motors 7 are fixedly mounted at the side walls of the fixed bin 2, the tail ends of output shafts of the power servo motors 7 are fixedly connected with one ends of the connecting columns 6, the connecting columns 6 can be driven to rotate through the work of the power servo motors 7, the mixing barrel 5 can be driven to turn back and forth, and then the internal chemical agents can be fully mixed through the turning of the mixing barrel 5; the upper surface of the mixing barrel 5 is fixedly provided with a rotating motor 8, an output shaft of the rotating motor 8 extends into an inner cavity of the mixing barrel 5, one end of a rotating rod 9 is fixedly connected at the tail end of the output shaft of the rotating motor 8, the other end of the rotating rod 9 is rotatably connected with the bottom wall of the inner cavity of the mixing barrel 5, an agitating blade 10 is fixedly connected at the arc-shaped wall of the rotating rod 9, the rotating rod 9 can be driven to rotate through the work of the rotating motor 8, the agitating blade 10 can be driven to rotate through the rotation of the rotating rod 9, chemical agents in the mixing barrel can be fully mixed through the rotation of the agitating blade 10, and the mixing effect is better and the mixing efficiency is higher by matching with the overturning of the mixing barrel 5; the infusion pumps A3 are provided with a plurality of infusion pumps A3, the output ends of the infusion pumps A3 are fixedly connected with one ends of connecting hoses 4, the other ends of the connecting hoses 4 extend into the inner cavity of the mixing barrel 5 and are fixedly connected with the mixing barrel 5, electromagnetic valves are arranged on the connecting hoses 4, and different chemical agents can be conveyed into the inner cavity of the mixing barrel 5 through the infusion pumps A3; the extrusion structure comprises a fixed barrel 11, an infusion pump B12, a connecting hose B13, a connecting hose C14, guide rods 15, a sliding plate 16, a servo driving motor 17 and a threaded rod 18, wherein the fixed barrel 11 is fixedly arranged in an inner cavity of the fixed bin 2, the guide rods 15 are fixedly connected to two sides of the inner cavity of the fixed barrel 11, the sliding plate 16 is connected onto the guide rods 15 in a sliding manner, and a plurality of filtering holes are formed in the sliding plate 16; a servo driving motor 17 is fixedly installed on the upper surface of the fixed barrel 11, one end of a threaded rod 18 is fixedly connected to the tail end of an output shaft of the servo driving motor 17, the other end of the threaded rod 18 extends to the bottom wall of an inner cavity of the fixed barrel 11 and is rotatably connected with the fixed barrel 11, the threaded rod 18 penetrates through the sliding plate 16 and is in threaded fit with the sliding plate 16, the threaded rod 18 can be driven to rotate through the work of the servo driving motor 17, the sliding plate 16 can be driven to move through the rotation of the threaded rod 18, chemical agents can be extruded and filtered through the movement of the sliding plate 16, and then polymer micelles in the fixed barrel are damaged; the inner cavity wall of the fixed bin 2 is fixedly provided with an infusion pump B12, the input end of the infusion pump B12 is fixedly connected with one end of a connecting hose B13, the other end of the connecting hose B13 extends into the inner cavity of the mixing barrel 5 and is fixedly connected with the mixing barrel 5, the output end of the infusion pump B12 is fixedly connected with one end of a connecting hose C14, the other end of the connecting hose C14 extends and is fixed into the inner cavity of the fixed barrel 11, electromagnetic valves are arranged on the connecting hose B13 and the connecting hose C14, and a chemical agent can be conveyed into the inner cavity of the fixed barrel 11 through the work of the infusion pump B12; the conveying structure comprises a connecting pipe B21, a conveying bin 22, a conveying pipe 23, a piston 24, a fixing plate 25, a rectangular fixing column 26, a lifting slider 27, a connecting plate 28, a servo motor 29 and a threaded column 30, wherein the upper surface of the fixed base 1 is fixedly connected with the conveying bin 22, the conveying pipe 23 is arranged on the bottom surface of the conveying bin 22, the piston 24 is arranged in an inner cavity of the conveying bin 22 in a sliding mode, and the fixing plate 25 is fixedly connected to the upper surface of the piston 24; an infusion pump C19 is fixedly mounted on the side wall of the fixed bin 2, one end of a connecting pipe A20 is fixedly connected to the input end of the infusion pump C19, the other end of the connecting pipe A20 extends and is fixed in the inner cavity of the fixed bin 11, one end of a connecting pipe B21 is fixedly connected to the output end of the infusion pump C19, the other end of the connecting pipe B21 extends and is fixed in the inner cavity of the conveying bin 22, electromagnetic valves are mounted on the connecting pipe A20 and the connecting pipe B21, and a chemical agent can be conveyed to the conveying bin 22 through the operation of the infusion pump C19; a rectangular fixing column 26 is fixedly connected to the upper surface of the conveying bin 22, a lifting slider 27 is slidably connected to the inner cavity of the rectangular fixing column 26, one end of a connecting plate 28 is fixedly connected to the bottom surface of the lifting slider 27, the other end of the connecting plate 28 penetrates through the conveying bin 22 and is fixedly connected to the fixing plate 25, a servo motor 29 is fixedly mounted on the upper surface of the rectangular fixing column 26, one end of a threaded column 30 is fixedly connected to the tail end of an output shaft of the servo motor 29, the other end of the threaded column 30 extends into the inner cavity of the rectangular fixing column 26, the other end of the threaded column 30 is rotatably connected to the bottom wall of the inner cavity of the rectangular fixing column 26, the threaded column 30 penetrates through the lifting slider 27 and is in threaded fit with the lifting slider 27, the threaded column 30 can be driven to rotate by the operation of the servo motor 29, and the lifting slider 27 can be driven to move by the rotation of the threaded column 30, the connecting plate 28 can be driven to move by the movement of the lifting slide block 27, the fixing plate 25 can be driven to move by the movement of the connecting plate 28, the piston 24 is driven to move, and the chemical agent can be extruded and output by the pushing of the piston 24.

The application has the advantages that:

1. the chemical agent mixer is reasonable in structure and convenient to use, has a mixing structure, can be used for mixing chemical agents more efficiently, is more uniform in mixing, and has a better mixing effect;

2. the chemical agent extruding and shearing device is provided with an extruding structure, and the chemical agent can be fully extruded and sheared through the extruding structure, so that an internal polymer micelle can be damaged, and the chemical agent can be fully cured;

3. this application has transport structure, can carry the chemical agent through transport structure, and the volume of the chemical agent of carrying simultaneously can carry out nimble control, can pressurize and carry, and the result of use is better, is fit for using widely.

It is well within the skill of those in the art to implement, without undue experimentation, the present application is not directed to software and process improvements, as they relate to circuits and electronic components and modules.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A mix curing device for chemical flooding oil recovery which characterized in that: comprises a fixed base (1), a fixed bin (2), an infusion pump A (3), a mixing structure, an extrusion structure and a conveying structure; the infusion pump is characterized in that a fixed bin (2) is fixedly connected to the upper surface of the fixed base (1), a mixing structure is arranged in an inner cavity of the fixed bin (2), an infusion pump A (3) is fixedly arranged on the upper surface of the fixed base (1), an extrusion structure is arranged in the inner cavity of the fixed bin (2), and a conveying structure is arranged on the upper surface of the fixed base (1); the mixing structure comprises a mixing barrel (5), connecting columns (6), a power servo motor (7), a rotating motor (8), a rotating rod (9) and stirring blades (10), wherein the side walls of the two sides of the mixing barrel (5) are fixedly connected with one end of each connecting column (6), the other ends of the two connecting columns (6) extend to the inner cavity side wall of the fixed bin (2) and are rotatably connected with the fixed bin (2), the power servo motor (7) is fixedly installed on the side wall of the fixed bin (2), and the tail end of an output shaft of the power servo motor (7) is fixedly connected with one end of each connecting column (6); a rotating motor (8) is fixedly installed on the upper surface of the mixing barrel (5), an output shaft of the rotating motor (8) extends into an inner cavity of the mixing barrel (5), one end of a rotating rod (9) is fixedly connected to the tail end of the output shaft of the rotating motor (8), the other end of the rotating rod (9) is rotatably connected with the bottom wall of the inner cavity of the mixing barrel (5), and stirring blades (10) are fixedly connected to the arc-shaped wall of the rotating rod (9); the infusion pump A (3) is provided with a plurality of infusion pumps, the output ends of the infusion pumps A (3) are fixedly connected with one ends of connecting hoses (4), the other ends of the connecting hoses (4) extend into the inner cavity of the mixing barrel (5) and are fixedly connected with the mixing barrel (5), and the connecting hoses (4) are provided with electromagnetic valves; the extrusion structure includes fixed bucket (11), transfer pump B (12), coupling hose B (13), coupling hose C (14), guide bar (15), sliding plate (16), servo drive motor (17) and threaded rod (18), fixed being provided with fixed bucket (11) in the inner chamber of fixed storehouse (2), the equal fixedly connected with guide bar (15) of inner chamber both sides department of fixed bucket (11), sliding connection has sliding plate (16) on guide bar (15), a plurality of filtration pores have been seted up on sliding plate (16).

2. The hybrid curing device for chemical flooding oil recovery of claim 1, characterized in that: the upper surface department fixed mounting of fixed bucket (11) has servo drive motor (17), the output shaft terminal fixedly connected with one end of threaded rod (18) of servo drive motor (17), the other end of threaded rod (18) extend to the inner chamber diapire of fixed bucket (11) and with rotate between fixed bucket (11) be connected, threaded rod (18) run through sliding plate (16) and with between sliding plate (16) screw-thread fit.

3. The hybrid curing device for chemical flooding oil recovery as set forth in claim 1, characterized in that: inner chamber wall department fixed mounting in fixed storehouse (2) has transfer pump B (12), the one end of the input end department fixedly connected with coupling hose B (13) of transfer pump B (12), the other end of coupling hose B (13) extend to in the inner chamber of blending bin (5) and with between blending bin (5) fixed connection, the one end of the output end department fixedly connected with coupling hose C (14) of transfer pump B (12), the other end of coupling hose C (14) extends in the inner chamber of fixed bucket (11), all install on coupling hose B (13) and coupling hose C (14) and be provided with the solenoid valve.

4. The hybrid curing device for chemical flooding oil recovery as set forth in claim 1, characterized in that: conveying structure includes connecting pipe B (21), carries storehouse (22), conveyer pipe (23), piston (24), fixed plate (25), rectangle fixed column (26), lift slider (27), connecting plate (28), servo motor (29) and screw thread post (30), last surface department fixedly connected with of unable adjustment base (1) carries storehouse (22), the bottom surface department installation of carrying storehouse (22) is provided with conveyer pipe (23), it is provided with piston (24) to slide in the inner chamber of carrying storehouse (22), the last surface department fixedly connected with fixed plate (25) of piston (24).

5. The hybrid curing device for chemical flooding oil recovery as set forth in claim 4, characterized in that: the lateral wall department fixed mounting in fixed storehouse (2) has transfer pump C (19), the one end of the input end department fixedly connected with connecting pipe A (20) of transfer pump C (19), the other end of connecting pipe A (20) extends to be fixed to in the inner chamber of fixed bucket (11), the one end of the output end department fixedly connected with connecting pipe B (21) of transfer pump C (19), the other end of connecting pipe B (21) extends to be fixed to in the inner chamber of carrying storehouse (22), all install on connecting pipe A (20) and connecting pipe B (21) and be provided with the solenoid valve.

6. The hybrid curing device for chemical flooding oil recovery of claim 4, characterized in that: a rectangular fixing column (26) is fixedly connected to the upper surface of the conveying bin (22), a lifting slide block (27) is connected in the inner cavity of the rectangular fixed column (26) in a sliding way, one end of a connecting plate (28) is fixedly connected with the bottom surface of the lifting slide block (27), the other end of the connecting plate (28) penetrates through the conveying bin (22) and is fixedly connected with the fixing plate (25), a servo motor (29) is fixedly arranged on the upper surface of the rectangular fixing column (26), one end of a threaded column (30) is fixedly connected at the tail end of an output shaft of the servo motor (29), the other end of the threaded column (30) extends into the inner cavity of the rectangular fixed column (26), the other end of the threaded column (30) is rotationally connected with the bottom wall of the inner cavity of the rectangular fixed column (26), the threaded column (30) penetrates through the lifting slide block (27) and is in threaded fit with the lifting slide block (27).