Automatic liquid supplementing type mud pump structure based on pressure feedback

Abstract

The application discloses a kind of automatic liquid supplementing formula mud pump structure based on pressure feedback, it is related to mud pump liquid supplementing technical field, including frequency conversion liquid supplementing pump and mud pump body, connecting pipe assembly is arranged between the frequency conversion liquid supplementing pump and mud pump body, the right end of the frequency conversion liquid supplementing pump is provided with liquid supplementing pump feed inlet, the upper portion of the liquid supplementing pump feed inlet is provided with liquid supplementing pump discharge outlet.The application is provided with frequency conversion liquid supplementing pump, improves the water performance on mud pump suction end, improves mud pump work efficiency, and the working parameter of liquid supplementing pump is adjusted in time by the change feedback of mud pump outlet pressure, ensures that liquid supplementing is timely and appropriate, and the relative constancy of mud pump output end mud pressure, because mud pump is supplemented according to mud pump outlet pressure feedback, so when mud liquid level is higher, and self-suction capacity can satisfy, liquid supplementing pump does not need to be started, greatly reduce energy consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mud pump liquid supplementing, in particular to an automatic liquid supplementing mud pump structure based on pressure feedback. BACKGROUND

[0002] The mud pump is widely used in the fields of oil drilling and oil exploitation, and is used for conveying mud, water, sand and other substances, and plays a role of cooling, lubricating and cleaning well hole, and is one of indispensable equipment in oil drilling engineering. The function of the mud pump is to suck the mud in the mud purification tank, then pressurize and deliver to the well through the high-pressure manifold, riser and drill pipe, to cool and lubricate the drill pipe and other drilling tools, and carry out the cuttings generated in the drilling process to the mud purification system for purification treatment.

[0003] With the increase of well depth and the development of ultra-deep wells, the stability and size of mud pressure are required more strictly. With the increase of discharge pressure requirement, the self-suction of the mud pump cannot meet the actual demand. The common methods are: 1. increasing the height of the tank to realize the mud suction inlet pressure, 2. matching a sand pump to start the sand pump to pump mud into the mud pump suction inlet at the same time as starting the mud pump. The main problems of the above methods are: increasing the height of the tank leads to high cost and unsatisfactory effect; increasing the sand pump for liquid supply cannot realize the on-demand supplement, and the liquid supplement is not accurate enough. SUMMARY

[0004] (I) The technical problem solved: in view of the above-mentioned shortcomings of the prior art, the present application provides an automatic liquid supplementing mud pump structure based on pressure feedback, which can effectively solve the problems of the prior art.

[0005] (II) Technical scheme: in order to achieve the above purpose, the present application is realized by the following technical scheme: the present application discloses an automatic liquid supplementing mud pump structure based on pressure feedback, comprising a variable frequency liquid supplementing pump and a mud pump body, a connecting pipe assembly is arranged between the variable frequency liquid supplementing pump and the mud pump body, a liquid supplementing pump inlet is arranged at the right end of the variable frequency liquid supplementing pump, a liquid supplementing pump outlet is arranged above the liquid supplementing pump inlet, a mud pump inlet is arranged at the left end of the mud pump body, a mud pump outlet is sleeved on the surface of the mud pump inlet, and a pressure transmitter is fixedly installed on the mud pump outlet.

[0006] The connecting pipe assembly comprises a first pipe piece and a second pipe piece, the left end front side of the first pipe piece is provided with a slag discharge port, the middle position of the left end of the first pipe piece is provided with a secondary feeding pipe, the rear side of the left end of the first pipe piece is provided with a main feeding pipe, the rear side of the right end of the second pipe piece is provided with a main discharging pipe, the front sides of the first pipe piece and the second pipe piece are provided with a fixed base, a screw rod is installed in the fixed base through a driving mechanism, the rear end of the screw rod is fixedly connected with a sealing plug block, the rear end of the sealing plug block is fixedly connected with a connecting rod, the rear end of the connecting rod is fixedly connected with a first movable plug block, the rear end of the first movable plug block is fixedly connected with a stirring shaft, and the rear end of the stirring shaft is fixedly connected with a second movable plug block.

[0007] Further, the end surface of the first pipe piece and the second pipe piece that are attached to each other is provided with a first flange sealing groove, the end surface of the second pipe piece and the first pipe piece that are attached to each other is provided with a first flange sealing pad, the first flange sealing groove and the first flange sealing pad are matched, and the first pipe piece and the second pipe piece are fixed through bolts.

[0008] Further, the front ends of the first pipe piece and the second pipe piece are provided with a second flange sealing pad, the rear end of the fixed base is provided with a second flange sealing groove matched with the second flange sealing pad, and the first pipe piece, the second pipe piece and the fixed base are fixed through bolts.

[0009] Further, the driving mechanism comprises a motor, the motor is fixedly installed on the fixed base, a driving gear and a driven gear are rotatably installed in the fixed base and are engaged with each other, the driving gear is fixedly connected with the output shaft of the motor, a screw sleeve is fixedly installed in the fixed base, and the screw rod is inserted in the screw sleeve through threads.

[0010] Further, a guide groove is formed in the middle position of the screw rod, a limiting block is fixedly arranged in the driven gear, the limiting block slides in the guide groove, and the screw rod is movably inserted in the driven gear.

[0011] Further, the outer diameter of the sealing plug block is matched with the inner diameter of the first pipe piece and the second pipe piece, when the first pipe piece abuts against the lower side of the first limiting sealing ring, the second movable plug block abuts against the front side of the second limiting sealing ring, and the sealing plug block is located in front of the slag discharge port, when the front side of the second movable plug block abuts against the rear side of the first limiting sealing ring, the first movable plug block is located in front of the slag discharge port, the first limiting sealing ring and the second limiting sealing ring are arranged in the first pipe piece and the second pipe piece, the first limiting sealing ring is located in front of the secondary feeding pipe, and the second limiting sealing ring is located on the upper side of the secondary feeding pipe.

[0012] Further, the rear end of the first movable plug and the front and rear ends of the second movable plug are provided with round table type protrusions, the front and rear ends of the first limiting sealing ring and the front end of the second limiting sealing ring are provided with round table type openings, and the maximum outer diameters of the first movable plug and the second movable plug are adapted to the inner diameters of the first pipe piece and the second pipe piece.

[0013] Further, the outer diameter of the stirring shaft is smaller than the minimum inner diameter of the first limiting sealing ring, the blades of the stirring shaft are in a spiral shape, and the length of the stirring shaft is adapted to the spacing between the first limiting sealing ring and the second limiting sealing ring.

[0014] (Three) beneficial effects: compared with the known prior art, the technical scheme provided by the present application has the following beneficial effects: 1. By setting the variable frequency liquid supplementing pump, the water intake performance of the mud pump suction end is improved, the working efficiency of the mud pump is improved, and the working parameters of the liquid supplementing pump are adjusted in time through the feedback of the mud pump outlet pressure, ensuring that the liquid is supplemented in time and the output end mud pressure of the mud pump is relatively constant. Because the liquid supplementing pump is supplemented according to the mud pump outlet pressure feedback, it is not necessary to start the liquid supplementing pump when the mud level is high and the self-suction capacity can meet the requirements, which greatly reduces the energy consumption, and ensures that the drilling fluid circulation is smooth during oil exploitation, carries the rock cuttings to the ground in time, avoids the repeated cutting of the drill bit caused by the accumulation of the bottom of the hole, reduces the wear and improves the efficiency.

[0015] 2. By setting the connecting pipe assembly, the variable frequency liquid supplementing pump can realize opening and closing with respect to the liquid supplementing passage of the mud pump body. In this way, when the variable frequency liquid supplementing pump stops, the mud will not flow into the variable frequency liquid supplementing pump due to the always open pipeline, and the mud pump body will not be empty pumped due to the existence of the branch pipe, which can realize real-time self-starting and closing during drilling and exploitation, on the one hand, can reduce the waste of energy, and on the other hand, can ensure the normal work of the liquid supplementing pump.

[0016] 3、By setting the driving mechanism, the motor can control the closure and communication of the connecting passage of the auxiliary feeding pipe and the main discharging pipe and the auxiliary feeding pipe and the slag discharge port, so that when the connecting passage of the auxiliary feeding pipe and the main discharging pipe is closed for a long time, the mud remaining in the connecting pipe assembly is easy to dry, and the dried mud entering the main pipeline is easy to cause adverse effects, so that when the first movable plug moves forward to the slag discharge port, the second movable plug is still on the upper side of the auxiliary feeding pipe, that is, the passage of the auxiliary feeding pipe and the main discharging pipe is closed, and the mud can only be discharged through the slag discharge port. In the process of discharging the mud, the dried mud in the pipeline can be discharged together, so as to avoid entering the mud pump feeding port, and the stirring shaft can stir the dried mud, which is more convenient for the dried mud to be scattered and discharged. After part of the mud is discharged, the second movable plug moves to abut against the first limiting sealing ring, at this time the passage of the auxiliary feeding pipe and the slag discharge port is closed, and the passage of the auxiliary feeding pipe and the main discharging pipe is opened, at this time the liquid can be smoothly supplemented, and without the interference of dried mud, the lubrication quality of the mud is better, thereby benefiting the drilling work during oil exploitation, and improving the drilling mud supply quality during oil exploitation. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0018] Figure 1 It is a front view of the structure of the present application.

[0019] Figure 2 It is a rear view of the structure of the present application.

[0020] Figure 3 It is a structure diagram of the connecting pipe assembly in the present application.

[0021] Figure 4 It is a structure section view of the connecting pipe assembly in the present application.

[0022] Figure 5 It is a structure diagram of the first flange sealing gasket and the second flange sealing gasket in the present application.

[0023] Figure 6 It is a structure diagram of the first flange sealing groove and the second flange sealing groove in the present application.

[0024] Figure 7 It is a structure diagram of the connecting pipe assembly in the present application in the liquid supplementing state.

[0025] Figure 8 It is a structural schematic diagram of the stop state of the connecting pipe assembly in the application.

[0026] Figure 9 It is a structural schematic diagram of the start state of the connecting pipe assembly in the application.

[0027] Figure 10 It is a structural schematic diagram of the guide groove in the application.

[0028] The numbers in the figure respectively represent, 1, a variable frequency liquid supplement pump; 2, a liquid supplement pump feed inlet; 3, a liquid supplement pump discharge outlet; 4, a mud pump body; 5, a mud pump feed inlet; 6, a mud pump discharge outlet; 7, a pressure transmitter; 8, a first pipe piece; 9, a residue discharge port; 10, a secondary feed pipe; 11, a primary feed pipe; 12, a second pipe piece; 13, a primary discharge pipe; 14, a first flange sealing groove; 15, a first flange sealing pad; 16, a fixed base; 17, a second flange sealing pad; 18, a second flange sealing groove; 19, a motor; 20, a driving gear; 21, a driven gear; 22, a screw sleeve; 23, a screw rod; 24, a guide groove; 25, a limiting block; 26, a sealing plug block; 27, a connecting rod; 28, a first movable plug block; 29, a first limiting sealing ring; 30, a stirring shaft; 31, a second movable plug block; 32, a second limiting sealing ring. DETAILED DESCRIPTION

[0029] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments but not all of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0030] The present application will be further described below with reference to the embodiments.

[0031] Please refer to Figures 1-9 An embodiment provided by the present application: an automatic liquid supplement type mud pump structure based on pressure feedback, comprising a variable frequency liquid supplement pump 1 and a mud pump body 4, a connecting pipe assembly is arranged between the variable frequency liquid supplement pump 1 and the mud pump body 4, a liquid supplement pump feed inlet 2 is arranged at the right end of the variable frequency liquid supplement pump 1, a liquid supplement pump discharge outlet 3 is arranged above the liquid supplement pump feed inlet 2, a mud pump feed inlet 5 is arranged at the left end of the mud pump body 4, the mud pump feed inlet 5 is sleeved with a mud pump discharge outlet 6, and the mud pump discharge outlet 6 is fixedly installed with a pressure transmitter 7.

[0032] The connecting pipe assembly comprises a first pipe piece 8 and a second pipe piece 12, the left end front side of the first pipe piece 8 is provided with a residue discharging port 9, a sub-feeding pipe 10 is arranged at the middle position of the left end of the first pipe piece 8 and is communicated with the outlet of the liquid supplementing pump 3, a main feeding pipe 11 is arranged at the rear side of the left end of the first pipe piece 8, a main discharging pipe 13 is arranged at the rear side of the right end of the second pipe piece 12 and is communicated with the inlet of the mud pump 5, the front sides of the first pipe piece 8 and the second pipe piece 12 are provided with a fixed base 16, a screw rod 23 is arranged in the fixed base 16 through a driving mechanism, the rear end of the screw rod 23 is fixedly connected with a sealing plug 26, the rear end of the sealing plug 26 is fixedly connected with a connecting rod 27, the rear end of the connecting rod 27 is fixedly connected with a first movable plug 28, the rear end of the first movable plug 28 is fixedly connected with a stirring shaft 30, and the rear end of the stirring shaft 30 is fixedly connected with a second movable plug 31.

[0033] The sub-feeding pipe 10 can be connected with the outlet of the liquid supplementing pump 3 through a flange connecting pipe, and the main discharging pipe 13 can be connected with the inlet of the mud pump 5 through a flange connecting pipe.

[0034] In operation, the control system and the equipment in the prior art are matched, the control mode and principle of the part are the mature technology in the prior art, and the specific structure and principle will not be described here. First, the mud pump parameters are input through the touch screen in the control room, the PLC master control compares the pressure feedback by the pressure transmitter with the preset mud pump parameters, when the pressure is low, the variable frequency pump is started to pump the mud in the mud tank to supply the mud pump, the input mud amount of the mud pump is increased, so that the output pressure of the mud pump is increased until the output pressure reaches the predetermined value, after the output pressure reaches the predetermined value, the pressure feedback value reaches the predetermined value, the PLC master control sends a command, and the variable frequency pump stops working.

[0035] As a preferred embodiment in the embodiment, as shown in Figure 3 , Figure 5 and Figure 6 , the surface of the one end of the first pipe piece 8 and the second pipe piece 12 abutting each other is provided with a first flange sealing groove 14, the surface of the one end of the second pipe piece 12 and the first pipe piece 8 abutting each other is provided with a first flange sealing gasket 15, the first flange sealing groove 14 and the first flange sealing gasket 15 are matched, and the first pipe piece 8 and the second pipe piece 12 are fixed through bolts. The structure is used for separating the first pipe piece 8 and the second pipe piece 12, so that the internal cavity is convenient to clean, and the installation, disassembly and replacement of the internal structure components are convenient.

[0036] As a preferred embodiment in the embodiment, as shown in Figure 3 , Figure 5 and Figure 6As shown, the front end of the first tube piece 8 and the second tube piece 12 is provided with a second flange sealing gasket 17, the rear end of the fixed base 16 is provided with a second flange sealing groove 18 matched with the second flange sealing gasket 17, and the first tube piece 8 and the second tube piece 12 are fixed with the fixed base 16 by bolts. This structure is used to separate the combination of the fixed base 16, the first tube piece 8 and the second tube piece 12, so as to facilitate the disassembly and assembly of the internal components of the first tube piece 8 and the second tube piece 12.

[0037] Wherein the thickness of the first flange sealing groove 14 is greater than the inner side size of the first flange sealing gasket 15, and the thickness of the second flange sealing gasket 17 is greater than the inner side size of the second flange sealing groove 18, so that when fixed by tightening the bolts, the first flange sealing groove 14 and the second flange sealing groove 18 can be tightly connected to the connection by deformation, thereby realizing sealing. The specific structure material and principle are the existing flange technology, which will not be described here.

[0038] As a preferred embodiment in the present embodiment, as shown in Figure 4 and Figure 7 The driving mechanism includes a motor 19, the motor 19 is fixedly installed on the fixed base 16, a driving gear 20 and a driven gear 21 are rotatably installed in the fixed base 16, and the driving gear 20 and the driven gear 21 are engaged, the driving gear 20 is fixedly connected with the output shaft of the motor 19, a screw sleeve 22 is fixedly installed in the fixed base 16, and a screw rod 23 is threadedly inserted in the screw sleeve 22. This structure is used to rotate the screw rod 23 by electric drive, so that the screw rod 23 can also realize displacement by cooperating with the screw sleeve 22 while rotating, so as to achieve the functions of opening and closing the slag discharge port 9 and the auxiliary feed pipe 10.

[0039] As a preferred embodiment in the present embodiment, as shown in Figure 10 The middle position of the screw rod 23 is provided with a guide groove 24, a limiting block 25 is fixedly arranged in the driven gear 21, the limiting block 25 slides in the guide groove 24, and the screw rod 23 is movably inserted in the driven gear 21. This structure is used to limit the screw rod 23 by the limiting block 25 in the guide groove 24, so that the driven gear 21 can drive the screw rod 23 to rotate when the driven gear 21 rotates, so as to realize transmission, and when the screw rod 23 and the screw sleeve 22 threadedly act, the screw rod 23 can axially displace.

[0040] As a preferred embodiment in the present embodiment, as shown in Figure 4 , Figure 7 and Figure 8As shown, the outer diameter of the sealing plug 26 is matched with the inner diameter of the first tube piece 8 and the second tube piece 12, when the first tube piece 8 abuts against the lower side of the first limiting sealing ring 29, the second movable plug 31 abuts against the front side of the second limiting sealing ring 32, and the sealing plug 26 is at the front side of the slag outlet 9, when the front side of the second movable plug 31 abuts against the rear side of the first limiting sealing ring 29, the first movable plug 28 is at the front side of the slag outlet 9, the first limiting sealing ring 29 is at the front side of the auxiliary feeding pipe 10, and the second limiting sealing ring 32 is at the upper side of the auxiliary feeding pipe 10. The outer side of the sealing plug 26 is provided with a sealing rubber ring, which makes the outer side of the sealing plug 26 always adhere to the inner wall of the auxiliary feeding pipe 10, so as to play a sealing role, avoiding the liquid entering the front side of the first tube piece 8 through the slag outlet 9 or even flowing into the fixed base 16 to cause influence, and meanwhile, when the second movable plug 31 moves forward to open the connecting passage of the auxiliary feeding pipe 10 and the main discharging pipe 13, the liquid supplementing work can be carried out, and at the same time, since the second movable plug 31 abuts against the first limiting sealing ring 29 to close the passage to the side of the slag outlet 9, the liquid can be prevented from flowing out, and meanwhile, when the second movable plug 31 abuts against the second limiting sealing ring 32, the first movable plug 28 abuts against the first limiting sealing ring 29, so that the auxiliary feeding pipe 10 cannot form a passage with the main discharging pipe 13 and the slag outlet 9, thereby closing the liquid supplementing passage.

[0041] As a preferred embodiment in the present embodiment, as shown in Figure 4 、 Figure 7 and Figure 8 , the rear end of the first movable plug 28 and the front and rear ends of the second movable plug 31 are provided with circular truncated cone-shaped protrusions, the front and rear ends of the first limiting sealing ring 29 and the front end of the second limiting sealing ring 32 are provided with circular truncated cone-shaped openings, the maximum outer diameters of the first movable plug 28 and the second movable plug 31 are matched with the inner diameters of the first tube piece 8 and the second tube piece 12. The outer walls of the circular truncated cone-shaped protrusions of the second movable plug 31 and the first movable plug 28 are glued with sealing rubber pads, and through the cooperation of the circular truncated cone-shaped connecting structure and the sealing rubber pads, the sealing effect can be ensured under a certain pressure.

[0042] As a preferred embodiment in the present embodiment, as shown in Figure 4 and Figure 8As shown, the outer diameter of the stirring shaft 30 is smaller than the minimum inner diameter of the first limiting sealing ring 29, the blades of the stirring shaft 30 are helical, and the length of the stirring shaft 30 is adapted to the spacing between the first limiting sealing ring 29 and the second limiting sealing ring 32. This structure is used to agitate the mud in the position by rotating the stirring shaft 30, so that the mud can be prevented from drying and solidifying and flowing out, and the mud is loosened by agitation to facilitate flowing out.

[0043] Working principle, before use, the main feed pipe 11 is connected to the main pipeline through the flange, and the auxiliary pipeline is connected to the feed inlet 2 of the liquid supplementing pump, and the main pipeline and the auxiliary pipeline are both connected to the mud tank, and then when used, the second movable plug 31 is first ensured to be in the state of abutting against the second limiting sealing ring 32, as shown in the figure, Figure 8 At this time, when the mud pump body 4 is started, the mud will be extracted from the mud tank through the main pipeline, the mud enters the main feed pipe 11, and flows into the mud pump feed inlet 5 from the main discharge pipe 13, and is discharged from the mud pump discharge outlet 6, and the pressure transmitter 7 can detect the pressure and flow rate at the time of discharge, and when the pressure and flow rate are low and need to be supplemented, the motor 19 is started, the motor 19 drives the driving gear 20 to rotate, and the driving gear 20 drives the driven gear 21 engaged therewith to rotate, and when the driven gear 21 rotates, the screw rod 23 is driven to rotate through the limiting block 25, and the screw rod 23 is displaced through the threaded action with the screw sleeve 22, and the screw rod 23 moves forward and rotates, thereby driving the sealing plug 26, the connecting rod 27, the first movable plug 28, the stirring shaft 30 and the second movable plug 31 to rotate and move forward together, and the stirring shaft 30 rotates to agitate the mud in the position to prevent the mud from caking and flowing out, and after the first movable plug 28 moves to the discharge port 9, as shown in the figure, Figure 9 At this time, the second movable plug 31 is on the upper side of the auxiliary feed pipe 10, and the discharge port 9 is in the open state, and at this time, the frequency conversion liquid supplementing pump 1 is started, the frequency conversion liquid supplementing pump 1 sucks the mud through the liquid supplementing pump feed inlet 2, and discharges the mud into the auxiliary feed pipe 10 through the liquid supplementing pump discharge outlet 3, and the mud is discharged through the discharge port 9, and at this time, the mud remaining in the auxiliary feed pipe 10 during the previous use is discharged from the discharge port 9, and when the second movable plug 31 abuts against the first limiting sealing ring 29, as shown in the figure, Figure 7 The passage of the auxiliary feed pipe 10 and the main discharge pipe 13 is opened, and the mud enters the mud pump feed inlet 5 through the main discharge pipe 13, thereby completing the liquid supplementing operation, and after the liquid supplementing operation, the second movable plug 31 is moved upward to abut against the second limiting sealing ring 32 to close, and the frequency conversion liquid supplementing pump 1 is closed synchronously, and when the sealing plug 26 moves upward, the mud in the position is pushed out, thereby preventing a large amount of mud from accumulating at the position close to the discharge port 9 of the first pipe piece 8 and the second pipe piece 12.

[0044] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A structure for an automatic replenishment mud pump based on pressure feedback, characterized in that: The system includes a variable frequency replenishing pump (1) and a mud pump body (4). A connecting pipe assembly is provided between the variable frequency replenishing pump (1) and the mud pump body (4). A replenishing pump inlet (2) is provided at the right end of the variable frequency replenishing pump (1), and a replenishing pump outlet (3) is provided above the replenishing pump inlet (2). A mud pump inlet (5) is provided at the left end of the mud pump body (4). A mud pump outlet (6) is sleeved on the surface of the mud pump inlet (5), and a pressure transmitter (7) is fixedly installed on the mud pump outlet (6). The connecting pipe assembly includes a first tube segment (8) and a second tube segment (12). A slag discharge port (9) is provided on the front side of the left end of the first tube segment (8), and a secondary feed is provided at the middle position of the left end of the first tube segment (8). The tube (10) has a main feed pipe (11) on the rear side of the left end of the first tube segment (8) and a main discharge pipe (13) on the rear side of the right end of the second tube segment (12). A fixed base (16) is provided on the front side of the first tube segment (8) and the second tube segment (12). A screw (23) is installed in the fixed base (16) through a drive mechanism. A sealing plug (26) is fixedly connected to the rear end of the screw (23). A connecting rod (27) is fixedly connected to the rear end of the sealing plug (26). A first movable plug (28) is fixedly connected to the rear end of the connecting rod (27). A stirring shaft (30) is fixedly connected to the rear end of the first movable plug (28), and a second movable plug (31) is fixedly connected to the rear end of the stirring shaft (30).

2. The automatic replenishment mud pump structure based on pressure feedback according to claim 1, characterized in that: The first pipe segment (8) and the second pipe segment (12) are provided with a first flange sealing groove (14) on the end surface where they are attached, and the second pipe segment (12) and the first pipe segment (8) are provided with a first flange sealing gasket (15) on the end surface where they are attached. The first flange sealing groove (14) and the first flange sealing gasket (15) are adapted to each other, and the first pipe segment (8) and the second pipe segment (12) are fixed together by bolts.

3. The automatic fluid replenishment mud pump structure based on pressure feedback according to claim 1, characterized in that: The first tube segment (8) and the second tube segment (12) are provided with a second flange sealing gasket (17) at their front ends. The fixed base (16) is provided with a second flange sealing groove (18) that is compatible with the second flange sealing gasket (17) at its rear end. The first tube segment (8) and the second tube segment (12) are fixed to the fixed base (16) by bolts.

4. The automatic fluid replenishment mud pump structure based on pressure feedback according to claim 1, characterized in that: The drive mechanism includes a motor (19), the motor (19) is fixedly mounted on the fixed base (16), the drive gear (20) and the driven gear (21) are rotatably mounted in the fixed base (16), and the drive gear (20) and the driven gear (21) mesh with each other. The drive gear (20) is fixedly connected to the output shaft of the motor (19). The screw sleeve (22) is fixedly mounted in the fixed base (16), and the screw (23) is threaded into the screw sleeve (22).

5. The automatic replenishment mud pump structure based on pressure feedback according to claim 4, characterized in that: A guide groove (24) is provided in the middle of the screw (23), and a limit block (25) is fixedly provided in the driven gear (21). The limit block (25) slides in the guide groove (24), and the screw (23) is movably inserted in the driven gear (21).

6. The automatic replenishment mud pump structure based on pressure feedback according to claim 1, characterized in that: The outer diameter of the sealing plug (26) is adapted to the inner diameter of the first tube segment (8) and the second tube segment (12). When the first movable plug (28) abuts against the lower side of the first limiting sealing ring (29), the second movable plug (31) abuts against the front side of the second limiting sealing ring (32). The sealing plug (26) is located in front of the slag discharge port (9). When the front side of the second movable plug (31) abuts against the rear side of the first limiting sealing ring (29), the first movable plug (28) is located in front of the slag discharge port (9). The first tube segment (8) and the second tube segment (12) are both provided with the first limiting sealing ring (29) and the second limiting sealing ring (32). The first limiting sealing ring (29) is located in front of the auxiliary feed pipe (10), and the second limiting sealing ring (32) is located in front of the auxiliary feed pipe (10).

7. The automatic replenishment mud pump structure based on pressure feedback according to claim 6, characterized in that: The rear end of the first movable plug (28) and the front and rear ends of the second movable plug (31) are provided with frustum-shaped protrusions. The front and rear ends of the first limiting sealing ring (29) and the front end of the second limiting sealing ring (32) are provided with frustum-shaped openings. The maximum outer diameter of the first movable plug (28) and the second movable plug (31) are adapted to the inner diameter of the first tube segment (8) and the second tube segment (12).

8. The automatic replenishment mud pump structure based on pressure feedback according to claim 1, characterized in that: The outer diameter of the stirring shaft (30) is smaller than the minimum inner diameter of the first limiting sealing ring (29). The blades of the stirring shaft (30) are spiral. The length of the stirring shaft (30) is adapted to the distance between the first limiting sealing ring (29) and the second limiting sealing ring (32).

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