Liquid pumping assembly of hydraulic slurry pump and hydraulic slurry pump adopting liquid pumping assembly

Abstract

The invention discloses a liquid pumping assembly of a hydraulic slurry pump and the hydraulic slurry pump adopting the liquid pumping assembly. The liquid pumping assembly of the hydraulic slurry pump comprises a left oil cylinder, a square box with a box cover, a cylinder sleeve, a pump head, a liquid outlet assembly and a right oil cylinder which are sequentially connected from left to right. The right end of the first power output shaft is connected with a piston capable of transversely moving in the cylinder sleeve through a movable connecting piece located in the square box. A top oil cylinder is vertically arranged at the top end of the pump head, a second power output shaft partially located in an inner cavity of the pump head is vertically arranged at the top of the top oil cylinder, and a first sealing valve is arranged at the bottom end of the second power output shaft. A pump head liquid outlet is formed in the right end of the pump head, a right oil cylinder is transversely arranged at the right end of the liquid outlet assembly, a third power output shaft partially located in an inner cavity of the liquid outlet assembly is transversely arranged in the right oil cylinder, and a second sealing valve is arranged at the left end of the third power output shaft; the liquid outlet assembly is provided with a liquid drainage hole communicated with an inner cavity of the liquid outlet assembly. The invention has the characteristics of stable and accurate flow and pressure and high stability.

Description

Technical Field

[0001] The present invention relates to the technical field of mud pumps, and particularly to a liquid extraction assembly of a hydraulic mud pump and a hydraulic mud pump adopting the liquid extraction assembly. Background Art

[0002] A mud pump is an indispensable drilling auxiliary equipment for geotechnical engineering construction such as geological exploration, oil and gas field exploitation, and special drilling. During the drilling process, it is used to convey media such as mud or clear water to the drill pipe, mainly playing the role of cooling, flushing the drill bit and soil.

[0003] At present, most of the mud pumps in service are driven by the reciprocating motion of the traditional mechanical crank - connecting rod mechanism. Usually, a diesel engine or an electric motor drives the reduction through belt transmission, then through a gear reducer for reduction, and then through the crank - connecting rod mechanism and the guiding slider to drive the piston rod and the plunger of the mud pump head to perform reciprocating motion to work, realizing the liquid suction and liquid discharge functions of the mud pump head. Due to the adoption of the crank - connecting rod mechanism in the traditional mud pump, the running speed of the plunger of the mud pump head changes approximately in a sine curve, so that the instantaneous flow rate and pressure of the discharged liquid also roughly change in a sine curve, with large fluctuations. In order to reduce the fluctuations of the flow rate and pressure in the discharge manifold of the mud pump head, a conventional technical solution is to install an air chamber at the discharge port of the mud pump head, but this increases the weight of the equipment and the difficulty of maintenance.

[0004] In order to meet the growing demand for mud pumps in geotechnical engineering construction, it has become an inevitable trend to study a mud pump with a novel structure and small fluctuation amount to replace the mud pump driven by the traditional crank - connecting rod mechanism. Summary of the Invention

[0005] The purpose of the present invention is to provide a liquid extraction assembly of a hydraulic mud pump and a hydraulic mud pump adopting the liquid extraction assembly in view of the deficiencies of the prior art.

[0006] The technical solution adopted by the present invention is as follows.

[0007] The liquid extraction assembly of a hydraulic piston type mud pump includes, from left to right in sequence, a left oil cylinder, a square box with a box cover, a cylinder liner, a pump head, a liquid outlet assembly, and a right oil cylinder, which are connected in sequence; a first power output shaft is horizontally arranged in the left oil cylinder; a first through hole is arranged on the right side surface of the square box, and a second through hole is arranged on the left side surface of the square box; the diameter of the through hole on the right side surface of the square box is the same as the inner hole diameter of the cylinder liner; the right end of the first power output shaft of the left oil cylinder passes through the second through hole; the right end of the first power output shaft is connected to a piston that can move horizontally in the cylinder liner through a movable connecting piece located in the square box; the right end of the cylinder liner is communicated with the inner cavity of the pump head; a pump head liquid inlet is arranged at the bottom end of the pump head, a top oil cylinder is vertically arranged at the top end of the pump head, a second power output shaft partially located in the inner cavity of the pump head is vertically arranged at the top of the top oil cylinder, and a first sealing valve that contacts the pump head liquid inlet and seals the pump head liquid inlet is arranged at the bottom end of the second power output shaft; a pump head liquid outlet is arranged at the right end of the pump head, a right oil cylinder is horizontally arranged at the right end of the liquid outlet assembly, a third power output shaft partially located in the inner cavity of the liquid outlet assembly is horizontally arranged in the right oil cylinder, and a second sealing valve that contacts the pump head liquid outlet and seals the liquid outlet is arranged at the left end of the third power output shaft; a drain hole communicated with the inner cavity of the liquid outlet assembly is arranged on the liquid outlet assembly.

[0008] During operation, the first power output shaft of the left oil cylinder drives the piston to move leftward, and the second power output shaft of the top oil cylinder drives the first sealing valve to move upward. Under the adsorption effect of the piston on the air in the pump head liquid inlet, the mud enters the inner cavity of the pump head and the cylinder liner from the pump head liquid inlet; then, the first power output shaft of the left oil cylinder drives the piston to move rightward, the second power output shaft drives the first sealing valve to move downward and contact and seal the pump head liquid inlet, the third power output shaft of the right oil cylinder drives the second sealing valve to move rightward, the mud is output from the pump head liquid outlet, and then the third power output shaft of the right oil cylinder resets to complete one stroke. Repeat this process.

[0009] The beneficial effects of the present invention are as follows: It changes the traditional crank - connecting rod mechanism and guiding slider to drive the piston rod and the plunger of the mud pump head to perform reciprocating motion work, realizes the liquid suction and drainage functions of the mud pump head, directly uses the first power output shaft of the left oil cylinder to drive the piston, avoids the non - horizontal motion interference caused by the crank - connecting rod mechanism and guiding slider driving the piston rod, uses the second power output shaft of the top oil cylinder to drive the first sealing valve to seal / unseal the pump head liquid inlet, and uses the third power output shaft of the right oil cylinder to drive the second sealing valve to seal / unseal the pump head liquid outlet, which can control the instantaneous flow rate and pressure of the liquid discharged from the inner cavity of the pump head, and avoid the problem of large fluctuations with a sinusoidal curve change. Since the crank - connecting rod mechanism and guiding slider are not used, and the first power output shaft of the horizontally arranged left oil cylinder is directly used to drive the piston, compared with a mud pump of the same length using the crank - connecting rod mechanism and guiding slider, the liquid suction volume of the cylinder liner is greatly increased; it can accurately and quantitatively complete one - stroke liquid suction / drainage as required, making the flow rate and pressure of the mud pump stable, operating normally, precisely, with high stability and stable efficiency.

[0010] As a preferred technical solution, the piston includes a piston cap and a piston seat; a square box is connected to the left end of the cylinder liner, and the diameters of the left and right ends of the piston cap are slightly larger than the diameters of the rest of it, so as to form sealing lip rings at the left and right ends of the radially outer peripheral surface of the piston cap; the radially outer peripheral surfaces of the two sealing lip rings are in close contact with the inner hole of the cylinder liner. After the piston is worn after being used for a period of time, air is often sucked in from behind the piston when sucking slurry backward, resulting in a reduction in flow rate and unstable pressure. With this technical solution, it can prevent air from being sucked in on the left side of the piston cap, further stabilizing the flow rate and pressure of the slurry pump, enabling it to work normally, accurately, with high stability and stable efficiency.

[0011] As a preferred technical solution, a sealing ring groove is provided between the two sealing lip rings on the radially outer peripheral surface of the piston cap, and a polytetrafluoroethylene sealing ring is installed on the sealing ring groove. The radially outer peripheral surface of the polytetrafluoroethylene sealing ring is in close contact with the inner hole of the cylinder liner. With this technical solution, the wear resistance of the radially outer peripheral surface of the piston cap is increased.

[0012] As a preferred technical solution, the piston seat and the right side surface of the piston cap are connected by a number of first connecting screws. With this technical solution, it is convenient to replace the piston cap and fix the piston cap.

[0013] As a preferred technical solution, the piston cap is provided with a blind hole for connecting the piston seat with an opening to the right; the right end of the piston seat is installed with the piston cap and the right end of the piston seat is located in the blind hole for connecting the piston seat; the piston seat includes a main shaft of the piston seat coaxial with the cylinder liner, and the diameters of the left and right ends of the main shaft of the piston seat are larger than the diameters of the rest of it, so as to form outer convex rings of the piston seat at the left and right ends of the main shaft of the piston seat. The outer convex ring at the right end of the main shaft of the piston seat is located in the blind hole for connecting the piston seat; a blocking lip ring that can cover the left side surface of the outer convex ring at the right end of the main shaft of the piston seat is provided at the left end of the blind hole for connecting the piston seat of the piston seat; the central axes of the blind hole for connecting the piston seat, the first through hole, and the second through hole are all on the same straight line as the central axis of the inner hole of the cylinder liner. With this technical solution, it is convenient to fix the piston cap.

[0014] As a preferred technical solution, the movable connecting piece includes a left connecting shaft, a right connecting shaft, and a connecting sleeve. The central axes of the left connecting shaft, the right connecting shaft, the connecting sleeve, and the inner hole of the cylinder liner are on the same straight line; the right end of the left connecting shaft and the left end of the right connecting shaft are threadedly connected to the inner hole of the connecting sleeve; the right end of the right connecting shaft is connected with a first connecting flange, and the outer convex ring at the left end of the main shaft of the piston seat is bolted to the first connecting flange. With this technical solution, after opening the box cover and twisting the connecting sleeve, the piston seat can be removed and the piston cap can be replaced.

[0015] As a preferred technical solution, the piston seat outer convex ring at the left end of the piston seat main shaft is connected to the first connection flange through a number of first connection bolts; the left end of the left connection shaft is connected to the second connection flange, the right end of the first power output shaft is connected to the third connection flange, and the second connection flange and the third connection flange are connected through a number of second connection bolts; the right end of the first power output shaft is connected to the third connection flange through a number of second connection screws.

[0016] As a preferred technical solution, the central axes of the first power output shaft, the first through hole, the second through hole, and the second power output shaft are all on the same straight line as the central axis of the inner hole of the cylinder liner.

[0017] The hydraulic mud pump includes a frame body, a number of the above-mentioned any one of the hydraulic mud pump liquid extraction assemblies arranged in parallel on the frame body, and a control system, and each hydraulic mud pump liquid extraction assembly is connected to the control system. With this technical solution, one control system can control the operation of multiple hydraulic mud pump liquid extraction assemblies, and can control the instantaneous flow rate and pressure of the discharged liquid of multiple hydraulic mud pump liquid extraction assemblies to compensate each other, further making the flow rate and pressure of the mud pump stable, accurate, with high stability and stable efficiency.

[0018] As a preferred technical solution, each pump head liquid inlet is connected to a liquid inlet pipe, and each liquid discharge hole is respectively connected to a liquid outlet pipe. Description of the Drawings

[0019] Figure 1 It is a structural schematic diagram of a piston.

[0020] Figure 2 It is a structural schematic diagram of a preferred embodiment of the hydraulic piston type mud pump liquid extraction assembly of the present invention.

[0021] Figure 3 It is Figure 2 A partial enlarged view of part A of

[0022] Figure 4 It is Figure 2 A partial enlarged view of part B of

[0023] Figure 5 It is Figure 4 A partial enlarged view of part D of

[0024] Figure 6 It is Figure 4 A partial enlarged view of part E of

[0025] Figure 7 It is Figure 2 A partial enlarged view of part C of

[0026] Figure 8 It is Figure 7 A partial enlarged view of part F of

[0027] Figure 9 is Figure 8 A partial enlarged view of the H part of

[0028] Figure 10 is Figure 7 A partial enlarged view of the G part of

[0029] Figure 11 is Figure 2 A state diagram of the liquid extraction assembly of the hydraulic piston type mud pump shown in

[0030] Figure 12 is Figure 11 A partial enlarged view of the I part of

[0031] Figure 13 is Figure 11 A partial enlarged view of the J part of

[0032] Figure 14 is Figure 11 A partial enlarged view of the K part of

[0033] Figure 15 is Figure 14 A partial enlarged view of the L part of

[0034] Figure 16 is Figure 2 A state diagram of the liquid extraction assembly of the hydraulic piston type mud pump shown in

[0035] Figure 17 is Figure 16 A partial enlarged view of the M part of

[0036] Figure 18 is Figure 16 A partial enlarged view of the N part of

[0037] Figure 19 is Figure 16 A partial enlarged view of the O part of

[0038] Figure 20 is Figure 2 A disassembly diagram of the liquid extraction assembly of the hydraulic piston type mud pump shown in

[0039] Figure 21 is Figure 20 A partial enlarged view of the P part of

[0040] Figure 22 A schematic structural diagram of a piston

[0041] Figure 23 A schematic structural diagram of a preferred embodiment of the liquid extraction assembly of the hydraulic piston type mud pump of the present invention

[0042] Figure 24 is Figure 23 a partial enlarged view of the Q part of

[0043] Figure 25 a schematic structural view of a piston

[0044] Figure 26 is a schematic structural view of a preferred embodiment of the liquid pumping assembly of the hydraulic piston type mud pump of the present invention

[0045] Figure 27 is Figure 26 a partial enlarged view of the R part of

[0046] Wherein: cylinder liner - 1; square box - 2; first through hole - 21; second through hole - 22; box cover - 23; piston - 3; piston cap - 30; piston seat connection blind hole - 31; sealing lip ring - 32; polytetrafluoroethylene sealing ring - 33; first connecting screw - 34; blocking lip ring - 35; piston seat - 36; piston seat main shaft - 37; piston seat outer convex ring - 38; left oil cylinder - 4; first power output shaft - 41; pump head - 5; pump head inner cavity - 50; pump head liquid inlet - 51; pump head liquid outlet - 52; connector - 6; left connecting shaft - 61; right connecting shaft - 62; connecting sleeve - 63; first connecting flange - 64; first connecting bolt - 65; second connecting flange - 66; third connecting flange - 67; second connecting bolt - 68; second connecting screw - 69; liquid pumping assembly - 7; liquid pumping assembly inner cavity - 70; liquid discharge hole - 71; right oil cylinder - 8; third power output shaft - 81; second sealing valve - 82; top oil cylinder - 9; second power output shaft - 91; first sealing valve - 92; frame - 10; liquid inlet pipe - 11. Specific embodiments

[0047] Next, the present invention will be further described in conjunction with the drawings and embodiments.

[0048] Embodiment 1. As Figure 1-19 shown, the liquid pumping assembly of the hydraulic piston type mud pump includes, in sequence from left to right, a left oil cylinder 4, a square box 2 provided with a box cover 23, a cylinder liner 1, a pump head 5, a liquid pumping assembly 7, and a right oil cylinder 8 that are connected in sequence; A first power output shaft 41 is horizontally arranged inside the left oil cylinder 4; a first through hole 21 is provided on the right side surface of the square box 2, and a second through hole 22 is provided on the left side surface of the square box 2; the diameter of the through hole on the right side surface of the square box 2 is the same as the inner hole diameter of the cylinder sleeve 1; the right end of the first power output shaft 41 of the left oil cylinder 4 passes through the second through hole 22; the right end of the first power output shaft 41 is connected to a piston 3 that can move horizontally inside the cylinder sleeve 1 through a movable connecting piece 6 located inside the square box 2; the right end of the cylinder sleeve 1 is communicated with the pump head inner cavity 50; a pump head liquid inlet 51 is provided at the bottom end of the pump head 5, a top oil cylinder 9 is vertically arranged at the top end of the pump head 5, a second power output shaft 91 partially located inside the pump head inner cavity 50 is vertically arranged at the top of the top oil cylinder 9, and a first sealing valve 92 that contacts the pump head liquid inlet 51 and seals the pump head liquid inlet 51 is provided at the bottom end of the second power output shaft 91; a pump head liquid outlet 52 is provided at the right end of the pump head 5, a right oil cylinder 8 is horizontally arranged at the right end of the liquid outlet assembly 7, a third power output shaft 81 partially located inside the liquid outlet assembly inner cavity 70 is horizontally arranged inside the right oil cylinder 8, and a second sealing valve 82 that contacts the pump head liquid outlet 52 and seals the liquid outlet is provided at the left end of the third power output shaft 81; a liquid discharge hole 71 communicated with the liquid outlet assembly inner cavity 70 is provided on the liquid outlet assembly 7.

[0049] The piston includes a piston cap 30 and a piston seat 36; the left end of the cylinder sleeve 1 is connected to the square box 2, and the diameters of the left and right ends of the piston cap 30 are slightly larger than the diameters of the rest of its parts, so as to form sealing lip rings 32 at the left and right ends of the radial outer peripheral surface of the piston cap 30; the radial outer peripheral surfaces of the two sealing lip rings 32 are in close contact with the inner hole of the cylinder sleeve 1. After the piston is worn after being used for a period of time, air is often sucked in from behind the piston when sucking slurry backward, resulting in a reduction in flow rate and unstable pressure. With this technical solution, this can prevent air from being sucked in on the left side of the piston cap 30, further making the flow rate and pressure of the slurry pump stable, enabling normal operation, being precise, having high stability, and stable efficiency.

[0050] The piston cap 30 is provided with a piston seat connecting blind hole 31 opening to the right; the right end of the piston seat 36 is installed with the piston cap 30 and the right end of the piston seat 36 is located inside the piston seat connecting blind hole 31; the piston seat 36 includes a piston seat main shaft 37 coaxial with the cylinder sleeve 1, and the diameters of the left and right ends of the piston seat main shaft 37 are larger than the diameters of the rest of its parts, so as to form piston seat outer convex rings 38 at the left and right ends of the piston seat main shaft 37. The piston seat outer convex ring 38 at the right end of the piston seat main shaft 37 is located inside the piston seat connecting blind hole 31; a blocking lip ring 35 that can cover the left side surface of the piston seat outer convex ring 38 at the right end of the piston seat main shaft 37 is provided at the left end of the piston seat connecting blind hole 31 of the piston seat 36; the central axes of the piston seat connecting blind hole 31, the first through hole 21, and the second through hole 22 are all on the same straight line as the central axis of the inner hole of the cylinder sleeve 1. With this technical solution, it is convenient to fix the piston cap 30.

[0051] The movable connecting piece 6 includes a left connecting shaft 61, a right connecting shaft 62, and a connecting sleeve 63. The central axes of the left connecting shaft 61, the right connecting shaft 62, and the connecting sleeve 63 are collinear with the central axis of the inner hole of the cylinder sleeve 1. The right end of the left connecting shaft 61 and the left end of the right connecting shaft 62 are threadedly connected to the inner hole of the connecting sleeve 63. The right end of the right connecting shaft 62 is connected with a first connecting flange 64, and the piston seat outer convex ring 38 at the left end of the piston seat main shaft 37 is bolted to the first connecting flange 64. With this technical solution, after opening the box cover 23 and twisting the connecting sleeve 63, the piston seat 36 can be removed to replace the piston cap 30.

[0052] The piston seat outer convex ring 38 at the left end of the piston seat main shaft 37 is connected to the first connecting flange 64 by a number of first connecting bolts 65.

[0053] The left end of the left connecting shaft 61 is connected with a second connecting flange 66, the right end of the first power output shaft 41 is connected with a third connecting flange 67, and the second connecting flange 66 and the third connecting flange 67 are connected by a number of second connecting bolts 68.

[0054] The right end of the first power output shaft 41 is connected with a third connecting flange 67 by a number of second connecting screws 69.

[0055] The central axes of the first power output shaft 41, the first through hole 21, the second through hole 22, and the second power output shaft 91 are all collinear with the central axis of the inner hole of the cylinder sleeve 1.

[0056] When disassembling the piston, open the box cover 23, remove the second connecting bolts 68, and successively remove the second connecting flange 66, the left connecting shaft 61, the connecting sleeve 63, the right connecting shaft 62, and the bolts of the first connecting flange 64. Finally, take out the piston from the square box 2 for replacement.

[0057] During operation, the first power output shaft 41 of the left oil cylinder 4 drives the piston 3 to move leftward, and the second power output shaft 91 of the top oil cylinder 9 drives the first sealing valve 92 to move upward. Under the adsorption effect of the piston 3 on the air in the pump head liquid inlet 51, the mud enters the pump head inner cavity 50 and the cylinder sleeve 1 from the pump head liquid inlet 51. Then, the first power output shaft 41 of the left oil cylinder 4 drives the piston 3 to move rightward, the second power output shaft 91 drives the first sealing valve 92 downward and contacts and seals the pump head liquid inlet 51, and the third power output shaft 81 of the right oil cylinder 8 drives the second sealing valve 82 to move rightward. The mud is output from the pump head liquid outlet 52, and then the third power output shaft 81 of the right oil cylinder 8 resets to complete one stroke. Repeat this process.

[0058] The beneficial effects of the present invention are as follows: By changing the traditional crank - connecting rod mechanism and the guiding slider to drive the piston rod and the plunger of the mud pump head to perform reciprocating motion, the liquid suction and liquid discharge functions of the mud pump head are realized. The piston 3 is directly driven by the first power output shaft 41 of the left oil cylinder 4, avoiding the non - lateral motion interference caused by the crank - connecting rod mechanism and the guiding slider driving the piston rod. The second power output shaft 91 of the top oil cylinder 9 drives the first sealing valve 92 to seal / unseal the liquid inlet 51 of the pump head, and the third power output shaft 81 of the right oil cylinder 8 drives the second sealing valve 82 to seal / unseal the liquid outlet 52 of the pump head, which can control the instantaneous flow rate and pressure of the discharged liquid in the inner cavity 50 of the pump head, avoiding the problem of large fluctuations with a sinusoidal curve change. Since the crank - connecting rod mechanism and the guiding slider are not used, and the piston 3 is directly driven by the first power output shaft 41 of the horizontally - arranged left oil cylinder 4, compared with a mud pump of the same length using the crank - connecting rod mechanism and the guiding slider, the liquid suction capacity of the cylinder liner 1 is greatly increased; it can accurately and quantitatively complete liquid suction / discharge in one stroke as required, making the flow rate and pressure of the mud pump stable, working properly, precisely, with high stability and stable efficiency.

[0059] The hydraulic mud pump includes a frame body 10, and two sets of the hydraulic mud pump liquid - pumping assemblies described in Embodiment 1 arranged in parallel on the frame body 10, and a control system. Each hydraulic mud pump liquid - pumping assembly is connected to the control system. With this technical solution, a single control system can control the operation of the two hydraulic mud pump liquid - pumping assemblies, and can control the instantaneous flow rate and pressure of the discharged liquid of multiple hydraulic mud pump liquid - pumping assemblies to compensate each other, further making the flow rate and pressure of the mud pump stable, precise, with high stability and stable efficiency.

[0060] Each liquid inlet 51 of the pump head is connected to a liquid inlet pipe 11, and each discharge hole 71 is respectively connected to a liquid outlet pipe.

[0061] Embodiment 2. The difference between this embodiment and Embodiment 1 is that: The hydraulic mud pump includes a frame body 10, and three sets of the hydraulic mud pump liquid - pumping assemblies described in Embodiment 1 arranged in parallel on the frame body 10, and a control system. Each hydraulic mud pump liquid - pumping assembly is connected to the control system. With this technical solution, a single control system can control the operation of the two hydraulic mud pump liquid - pumping assemblies, and can control the instantaneous flow rate and pressure of the discharged liquid of three hydraulic mud pump liquid - pumping assemblies to compensate each other, further making the flow rate and pressure of the mud pump stable, precise, with high stability and stable efficiency. Each liquid inlet 51 of the pump head is connected to a liquid inlet pipe 11, and each discharge hole 71 is respectively connected to a liquid outlet pipe.

[0062] Embodiment 3. As Figure 22-24As shown in the figure, the difference between this embodiment and Embodiment 1 lies in that: a sealing ring groove is provided between two sealing lip rings 32 on the radially outer peripheral surface of the piston cap 30, and a polytetrafluoroethylene sealing ring 33 is installed in the sealing ring groove. The radially outer peripheral surface of the polytetrafluoroethylene sealing ring 33 is in close contact with the inner hole of the cylinder liner 1. With this technical solution, the wear resistance of the radially outer peripheral surface of the piston cap 30 is increased.

[0063] Embodiment 4. As Figure 25-27 shown in the figure, the difference between this embodiment and Embodiment 1 lies in that: the piston seat 36 and the right side surface of the piston cap 30 are connected by a plurality of first connecting screws 34. With this technical solution, it is convenient to replace and fix the piston cap 30.

[0064] As mentioned above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent replacements or changes, and all should be covered within the protection scope of the present invention.

Claims

1. The liquid extraction assembly of a hydraulic piston type mud pump, characterized in that: From left to right, it successively includes a left oil cylinder (4), a square box (2) provided with a box cover (23), a cylinder liner (1), a pump head (5), a liquid outlet assembly (7), and a right oil cylinder (8) which are successively connected; a first power output shaft (41) is horizontally arranged in the left oil cylinder (4); a first through hole (21) is provided on the right side surface of the square box (2), and a second through hole (22) is provided on the left side surface of the square box (2); the diameter of the through hole on the right side surface of the square box (2) is the same as the inner hole diameter of the cylinder liner (1); the right end of the first power output shaft (41) of the left oil cylinder (4) passes through the second through hole (22); the right end of the first power output shaft (41) is connected to a piston (3) that can move horizontally in the cylinder liner (1) through a movable connecting piece (6) located in the square box (2); the right end of the cylinder liner (1) is communicated with the pump head inner cavity (50); a pump head liquid inlet (51) is provided at the bottom end of the pump head (5), a top oil cylinder (9) is vertically arranged at the top end of the pump head (5), a second power output shaft (91) partially located in the pump head inner cavity (50) is vertically arranged at the top of the top oil cylinder (9), and a first sealing valve (92) that contacts the pump head liquid inlet (51) and seals the pump head liquid inlet (51) is provided at the bottom end of the second power output shaft (91); a pump head liquid outlet (52) is provided at the right end of the pump head (5), a right oil cylinder (8) is horizontally arranged at the right end of the liquid outlet assembly (7), a third power output shaft (81) partially located in the liquid outlet assembly inner cavity (70) is horizontally arranged in the right oil cylinder (8), and a second sealing valve (82) that contacts the pump head liquid outlet (52) and seals the liquid outlet is provided at the left end of the third power output shaft (81); a drain hole (71) communicated with the liquid outlet assembly inner cavity (70) is provided on the liquid outlet assembly (7).

2. The liquid extraction assembly of a hydraulic piston type mud pump according to claim 1, characterized in that: The piston includes a piston cap (30) and a piston seat (36); the left end of the cylinder liner (1) is connected to the square box (2), and the diameters of the left and right ends of the piston cap (30) are slightly larger than the diameters of the other parts thereof, so that sealing lip rings (32) are formed at the left and right ends of the radial outer peripheral surface of the piston cap (30); the radial outer peripheral surfaces of the two sealing lip rings (32) are in close contact with the inner hole of the cylinder liner (1).

3. The liquid extraction assembly of a hydraulic piston type mud pump according to claim 1, characterized in that: A sealing ring groove is provided between the two sealing lip rings (32) on the radial outer peripheral surface of the piston cap (30), and a polytetrafluoroethylene sealing ring (33) is installed in the sealing ring groove. The radial outer peripheral surface of the polytetrafluoroethylene sealing ring (33) is in close contact with the inner hole of the cylinder liner (1).

4. The liquid extraction assembly of a hydraulic piston type mud pump according to claim 1, characterized in that: The piston seat (36) is connected to the right side surface of the piston cap (30) through a plurality of first connecting screws (34).

5. The piston connection structure of a double-acting mud pump according to claim 1, characterized in that: The piston cap (30) is provided with a piston seat connecting blind hole (31) opening to the right; the right end of the piston seat (36) is installed with the piston cap (30) and the right end of the piston seat (36) is located within the piston seat connecting blind hole (31); the piston seat (36) includes a piston seat main shaft (37) coaxial with the cylinder liner (1), the diameters of the left and right ends of the piston seat main shaft (37) are greater than the diameters of the remaining parts thereof, thereby forming piston seat outer convex rings (38) at the left and right ends of the piston seat main shaft (37), and the piston seat outer convex ring (38) at the right end of the piston seat main shaft (37) is located within the piston seat connecting blind hole (31); a blocking lip ring (35) capable of covering the left side surface of the piston seat outer convex ring (38) at the right end of the piston seat main shaft (37) is provided at the left end of the piston seat connecting blind hole (31) of the piston seat (36); the central axes of the piston seat connecting blind hole (31), the first through hole (21), and the second through hole (22) are all on the same straight line as the central axis of the inner hole of the cylinder liner (1).

6. The liquid extraction assembly of a double-hydraulic piston type mud pump according to claim 5, characterized in that: The movable connecting member (6) includes a left connecting shaft (61), a right connecting shaft (62), and a connecting sleeve (63), and the central axes of the left connecting shaft (61), the right connecting shaft (62), and the connecting sleeve (63) are on the same straight line as the central axis of the inner hole of the cylinder liner (1); the right end of the left connecting shaft (61) and the left end of the right connecting shaft (62) are threadedly connected to the inner hole of the connecting sleeve (63); the right end of the right connecting shaft (62) is connected with a first connecting flange (64), and the piston seat outer convex ring (38) at the left end of the piston seat main shaft (37) is bolted to the first connecting flange (64).

7. The piston connection structure of a double-acting mud pump according to claim 6, characterized in that: The piston seat outer convex ring (38) at the left end of the piston seat main shaft (37) is connected to the first connecting flange (64) by a plurality of first connecting bolts (65); the left end of the left connecting shaft (61) is connected with a second connecting flange (66), the right end of the first power output shaft (41) is connected with a third connecting flange (67), and the second connecting flange (66) and the third connecting flange (67) are connected by a plurality of second connecting bolts (68); the right end of the first power output shaft (41) is connected with a third connecting flange (67) by a plurality of second connecting screws (69).

8. The piston connection structure of a double-acting mud pump according to claim 1, characterized in that: The central axes of the first power output shaft (41), the first through hole (21), the second through hole (22), and the second power output shaft (91) are all on the same straight line as the central axis of the inner hole of the cylinder liner (1).

9. A hydraulic mud pump, characterized in that: It includes a frame body (10) and a plurality of hydraulic mud pump liquid extraction assemblies as described in any one of claims 1 - 8 arranged in parallel on the frame body (10), and each hydraulic mud pump liquid extraction assembly is connected to the control system.

10. The hydraulic mud pump according to claim 9, characterized in that: Each pump head liquid inlet (51) is connected to a liquid inlet pipe (11), and each liquid discharge hole (71) is respectively connected to a liquid discharge pipe.

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