Hydraulic end of reciprocating oil-gas mixed transport pump and assembling equipment thereof

Abstract

This invention discloses a hydraulic end of a reciprocating oil-gas mixed-transfer pump and its assembly equipment, belonging to the technical field of oil-gas transportation equipment. The device includes a suction valve assembly; the suction valve assembly includes a valve seat, a valve plate, and a main spring assembly. The main spring assembly is located below the valve plate, pulling the valve plate downwards to fit against the top surface of the valve seat. A secondary spring assembly is provided at the bottom of the valve seat, assisting in pulling the valve plate downwards. This invention, by placing the main spring assembly of the suction valve entirely below the valve plate, achieves valve-closing drive of the valve plate by the spring traction force, eliminating the need for pre-reserved spring installation space between the valve plate and the cylinder liner. This significantly reduces the ineffective clearance volume between the suction valve and the piston, improves the compression ratio of the mixed-transfer pump, and solves the air-lock problem in high-gas-oil ratio conditions caused by excessive clearance in traditional top-mounted spring-type suction valves.

Description

Technical Field

[0001] This invention relates to the field of oil and gas transportation equipment technology, and in particular to the hydraulic end of a reciprocating oil and gas mixed transportation pump and its assembly equipment. Background Technology

[0002] Reciprocating oil-gas mixed transport pumps have become the core power equipment of oil-gas mixed transport systems due to their technical advantages of wide pressure adaptability, high volumetric efficiency, and strong tolerance to fluctuations in the gas content of the medium. The structural performance of the hydraulic end valve group directly determines the operating condition adaptability, operational reliability, and maintenance cost of the mixed transport pump.

[0003] Currently, conventional reciprocating oil-gas mixed-transfer pumps generally use an upper-mounted spring structure for their suction valve assembly. This means the valve-closing return spring is positioned on the high-pressure side of the valve plate facing the cylinder liner. This structure requires ample space for spring expansion and contraction between the valve plate and the cylinder liner, resulting in an ineffective clearance of over 70% of the pump's total clearance volume. Under high gas-to-oil ratio transport conditions, the high-pressure gaseous medium within this clearance expands during the piston's return stroke, preventing the cylinder liner from forming a sufficient negative pressure differential to open the suction valve. This easily leads to pump unit gas lock failure, causing a sharp drop in pump displacement or even complete malfunction, severely limiting the adaptability of reciprocating mixed-transfer pumps to high gas-to-oil ratio media. Furthermore, in the upper-mounted spring structure, the return spring is constantly exposed to the harsh environment of high-pressure alternating pressure and sand- and corrosive media on the cylinder liner side, making it prone to fatigue fracture, corrosion wear, and jamming failure. This significantly shortens the valve assembly's service life and increases the frequency of maintenance and unplanned downtime losses in the oilfield. Therefore, improvements are necessary. Summary of the Invention

[0004] This invention provides a hydraulic end of a reciprocating oil-gas mixed transport pump and its assembly equipment, which can solve the problem that the existing oil-gas mixed transport pump adsorption valve assembly setting method results in a large clearance, which easily causes a sudden drop in pump displacement or even failure to work normally under high gas-oil ratio transport conditions.

[0005] This invention provides a hydraulic end of a reciprocating oil-gas mixed transport pump, including a valve housing, a cylinder liner, a piston, a piston rod, an intake valve assembly, and an exhaust valve assembly; the intake valve assembly includes a valve seat, a valve plate, and a main spring assembly, the main spring assembly being located below the valve plate, and the valve plate being pulled down by the main spring assembly to fit against the top surface of the valve seat, thereby achieving the normal closure of the intake valve assembly; The bottom of the valve seat is provided with a secondary spring assembly, which is used to assist in pulling the valve plate downward under high gas content working conditions, so as to realize the rapid closing of the valve plate.

[0006] As a further aspect of the present invention: a guide rod is fixedly connected to the bottom of the valve plate, a movable sleeve is fixedly connected to the middle of the guide rod, a movable ring is provided on the top edge of the movable sleeve, a fixed seat is provided at the bottom of the guide rod, a guide hole is opened in the middle of the fixed seat, and the bottom of the guide rod is slidably disposed in the guide hole; a fixed ring is fixedly connected to the edge of the fixed seat, and a suction valve spring is fixedly connected between the top of the fixed ring and the bottom of the movable ring. Under normal conditions, the suction valve spring is in a stretched state.

[0007] As a further aspect of the present invention: the auxiliary spring assembly includes a movable cavity formed at the bottom of the valve seat, a positioning ring is provided in the middle of the movable cavity, a displacement ring is slidably connected inside the movable cavity, an auxiliary spring seat is fixedly connected to the outer edge of the movable ring, and a closing spring is fixedly connected between the top of the auxiliary spring seat and the bottom of the displacement ring.

[0008] As a further aspect of the present invention: the stroke of the closing spring is less than the stroke of the suction valve spring, and the stiffness of the closing spring is greater than the stiffness of the suction valve spring.

[0009] As a further aspect of the present invention: a feedback flow channel is provided at the top of the inner cavity of the active cavity, and one end of the feedback flow channel is connected to the output end of the oil-gas mixed transport pump.

[0010] An assembly device for the hydraulic end of a reciprocating oil-gas mixed-transfer pump, used to assemble a secondary spring assembly and a valve seat body, includes a machine base. An assembly conveyor belt is rotatably mounted on one side of the top of the machine base, and a feeding conveyor belt is rotatably mounted on one end of the machine base. The feeding conveyor belt is perpendicular to the feeding direction of the assembly conveyor belt. Several component placement racks are fixedly mounted on the surface of the feeding conveyor belt, which is used to feed the secondary spring assembly. Several valve seat placement racks are fixedly connected to the surface of the assembly conveyor belt, which is used to transport the valve seats. An assembly robotic arm is provided in the middle of the machine base for assembling the secondary spring assembly and the valve seats.

[0011] As a further aspect of the present invention: the output end of the assembly robotic arm is provided with a detection and clamping assembly, the detection and clamping assembly includes a drive motor, the output end of the drive motor is fixedly connected to a material picking sleeve, and an electrically controlled gripper is fixedly installed inside the material picking sleeve.

[0012] As a further aspect of the present invention: a directional motor is fixedly installed on the bottom edge of the material receiving sleeve, a detection frame is fixedly connected to the output end of the directional motor, a detection rod is slidably connected inside the detection frame, a pressure sensor is fixedly installed on the top of the inner wall of the detection frame, a return spring is fixedly connected between the top of the detection rod and the pressure sensor, an extension frame is fixedly connected to the bottom of the detection rod, and a detection ball is rotatably installed on the bottom of the extension frame.

[0013] As a further aspect of the present invention: a trimming assembly is provided at the other end of the top of the machine tool, the trimming assembly including a trimming motor, and a trimming grinding disc is fixedly connected to the output end of the trimming motor.

[0014] As a further aspect of the present invention: a cleaning frame is provided on one side of the dressing grinding disc, one end of the cleaning frame extends above the dressing grinding disc and is fixedly connected to a cleaning pad, a cleaning port is opened on one side of the cleaning frame, a cleaning pipe is fixedly connected to the inner wall of the cleaning port, and a return port is opened on the bottom side of the cleaning frame away from the cleaning port, a return pipe is fixedly connected to the inner wall of the return port.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention achieves valve closing drive by placing the main spring assembly of the suction valve entirely below the valve plate, thereby eliminating the need to reserve spring installation space between the valve plate and the cylinder liner. This significantly reduces the ineffective clearance volume between the suction valve and the piston, improves the compression ratio of the mixed-transfer pump, and solves the air lock problem in high air-oil ratio conditions caused by excessive clearance in traditional top-mounted spring-type suction valves. At the same time, placing the spring on the low-pressure side of the suction chamber, away from the high-pressure medium environment of the cylinder liner, effectively reduces the risk of spring corrosion and wear caused by high-pressure medium, and improves the working reliability and service life of the spring. This invention utilizes a secondary spring assembly with a closed-loop feedback channel at the bottom of the valve seat. The feedback channel, connected to the pump output, introduces high-pressure medium to create pressure linkage, automatically pushing a displacement ring to adjust the preload of the closed spring according to changes in the gas content of the medium. This allows the valve plate's opening and closing stiffness to be adaptively adjusted in real-time according to the gas-liquid ratio. Simultaneously, the closed spring design, with a stroke shorter than the main spring and a stiffness greater, can superimpose the closing force in the same direction as the main spring, significantly improving the valve plate's closing response speed under high gas content and high pressure differential conditions. This effectively suppresses valve plate chatter and asynchronous opening and closing, expanding the operating condition adaptability range of the mixed-transfer pump. The assembly equipment of the present invention, by setting an integrated detection clamping component at the output end of the assembly robot arm, and using a circumferentially rotatable detection ball in conjunction with a pressure sensor, can perform full-circumferential flatness detection on the top surface of the auxiliary spring seat before assembly, and pre-screen and reject abnormal auxiliary spring components, thus avoiding the problems of delayed opening and closing of the main spring tilting valve plate and abnormal wear of the mechanism caused by uneven force on the abnormal auxiliary spring components, and ensuring the long-term operational stability of the suction valve assembly. Attached Figure Description Figure 1 This is a schematic cross-sectional view of the hydraulic end of the oil-gas mixed transport pump of the present invention. Figure 2 This is a cross-sectional schematic diagram of the inhalation valve assembly of the present invention; Figure 3 For the present invention Figure 2 Enlarged view of local structure A in the middle; Figure 4 This is a three-dimensional schematic diagram of the inhalation valve assembly of the present invention; Figure 5 This is a three-dimensional schematic diagram of the assembly equipment of the present invention; Figure 6 For the present invention Figure 5 Enlarged schematic diagram of local structure B in the middle; Figure 7 This is a cross-sectional schematic diagram of the detection frame of the present invention; Figure 8 This is a cross-sectional schematic diagram of the cleaning frame of the present invention; Figure 9 This is a schematic diagram of the secondary spring assembly of the present invention; Figure 10 This is a schematic diagram of the valve seat body of the present invention.

[0016] Explanation of reference numerals in the attached figures: 1. Suction valve assembly; 101. Valve seat; 102. Valve plate; 103. Guide rod; 104. Suction valve spring; 105. Closing spring; 106. Movable sleeve; 107. Secondary spring seat; 108. Movable cavity; 109. Positioning ring; 110. Shifting ring; 111. Fixed seat; 112. Feedback channel; 201. Machine base; 202. Assembly conveyor belt; 203. Feeding conveyor belt; 204. Component placement rack; 205. Valve seat placement rack; 20 6. Valve seat holder; 207. Drive motor; 208. Material handling sleeve; 209. Electrically controlled gripper; 210. Directional motor; 211. Detection frame; 212. Extension frame; 213. Detection rod; 214. Detection ball; 215. Return spring; 216. Pressure sensor; 217. Dressing disc; 218. Cleaning frame; 219. Cleaning pad; 220. Cleaning pipe; 221. Return pipe; 3. Piston rod; 4. Valve housing; 5. Discharge valve assembly. Detailed Implementation

[0017] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0018] like Figures 1 to 4 As shown in the figure, the present invention provides a hydraulic end of a reciprocating oil-gas mixed-transfer pump, including a valve housing 4, a cylinder liner, a piston, a piston rod 3, a suction valve assembly 1, and a discharge valve assembly 5; the basic structural composition of the hydraulic end of the reciprocating oil-gas mixed-transfer pump composed of the above components, and the connection structure and positional relationship between the components are all in accordance with the prior art; the improvements made in this application are as follows: the suction valve assembly 1 includes a valve seat 101, a valve plate 102, and a main spring assembly; the main spring assembly is located below the valve plate 102, and pulls the valve plate 102 down to fit against the top surface of the valve seat 101, so as to realize the normal closure of the suction valve assembly 1; The main spring assembly specifically includes a guide rod 103 fixedly connected to the bottom of the valve plate 102, a movable sleeve 106 fixedly connected to the middle of the guide rod 103, a movable ring provided on the top edge of the movable sleeve 106, a fixed seat 111 provided at the bottom of the guide rod 103, a guide hole provided in the middle of the fixed seat 111, and the bottom of the guide rod 103 slidably disposed in the guide hole; a fixed ring fixedly connected to the edge of the fixed seat 111, and a suction valve spring 104 fixedly connected between the top of the fixed ring and the bottom of the movable ring. Under normal conditions, the suction valve spring is in a stretched state. This application reduces the space between the intake valve and the piston by placing the main spring assembly below the valve plate 102, i.e., a lower-mounted spring. This results in a smaller clearance in the valve box after piston compression, leading to a higher compression ratio in the mixed-transfer pump. At the same time, it fundamentally solves the air-lock problem in high-gas-oil ratio conditions caused by excessive clearance in traditional upper-mounted spring-type intake valves, achieving stable delivery of the oil-gas mixture. The spring is positioned away from the high-pressure side of the cylinder liner, reducing the risk of corrosion and wear from the high-pressure medium and improving the spring's reliability and service life.

[0019] A secondary spring assembly is provided at the bottom of the valve seat 101. This assembly assists in lowering the valve plate 102 under high gas content operating conditions. The secondary spring assembly includes a movable cavity 108 located at the bottom of the valve seat 101. A positioning ring 109 is located in the middle of the movable cavity 108, limiting the movement height of the shifting ring 110. The shifting ring 110 is slidably connected inside the movable cavity 108. A secondary spring seat 107 is fixedly connected to the outer edge of the movable ring. A closing spring 105 is fixedly connected between the top of the secondary spring seat 107 and the bottom of the shifting ring 110. Under high gas content or high pressure differential operating conditions, the intervention of the secondary spring and the main spring create a superimposed valve-closing force in the same direction, significantly improving the valve-closing stiffness and effectively suppressing the problem of asynchronous opening and closing of the valve plate 102, thus avoiding medium backflow and impact wear on the sealing surface.

[0020] In one embodiment, to ensure that the working state of the main spring assembly is not affected, and at the same time to effectively traction the valve plate 102 under high pressure differential conditions, the stroke of the closing spring 105 is less than the stroke of the suction valve spring 104, and the stiffness of the closing spring 105 is greater than the stiffness of the suction valve spring 104.

[0021] In one embodiment, a feedback channel 112 is provided at the top of the inner cavity of the active chamber 108, and a positioning ring 109 is disposed between the feedback channel 112 and the displacement ring 110. A through groove for the medium to pass through is provided in the middle of the positioning ring 109. One end of the feedback channel 112 is connected to the output end of the oil-gas mixed transport pump. By opening an integrated pneumatic control feedback channel 112 in the valve box, the high-pressure medium at the output end is introduced into the active chamber 108 to form a closed-loop pressure feedback. When the gas content of the medium increases, the pressure fluctuation amplitude at the output end increases synchronously. The feedback pressure automatically drives the displacement ring 110 to press down, thereby adjusting the preload of the auxiliary spring and realizing the real-time adaptive adjustment of the opening and closing stiffness of the valve plate 102 with the gas-liquid ratio. The higher the gas content, the greater the spring preload, and the faster the opening and closing response speed of the valve plate 102, thereby avoiding the problem of lag in the movement of the valve plate 102 under high gas content conditions.

[0022] The working principle of the hydraulic end of the above-mentioned reciprocating oil-gas mixed transport pump is as follows: When the mixed-transfer pump starts up, the piston returns to draw in the gas, creating a negative pressure inside the cylinder liner. The medium pushes upward against the valve plate 102, causing the guide rod 103 to slide upward. The tensioned suction valve spring 104 is further stretched, separating the valve plate 102 from the valve seat 101. As the piston enters the compression stroke, the pressure inside the cylinder liner increases, the upward thrust of the medium disappears, the suction valve spring 104 rebounds, pulling the guide rod 103 and valve plate 102 downward to reset, and the valve plate 102 and valve seat 101 re-engage. When the mixed-transfer pump enters a high-gas-content or high-pressure differential operating state, the feedback channel 112, connected to the output end of the oil-gas mixed-transfer pump, introduces the high-pressure medium from the output end. In the movable cavity 108 at the bottom of valve seat 101, the high-pressure medium passes through the through groove in the middle of the positioning ring 109, pushing the displacement ring 110 in the movable cavity 108 downward. This causes the auxiliary spring seat 107 to press down synchronously through the closing spring 105, which in turn causes the guide rod 103 to move down, increasing the closing pressure on the valve plate 102. This allows the valve plate 102 to overcome a larger pressure difference and achieve rapid and stable closure. When the gas content of the medium decreases and the pressure fluctuation at the output end decreases, the feedback pressure in the movable cavity 108 decreases, the closing spring 105 rebounds, and the displacement ring 110 is driven to reset upward. The auxiliary spring assembly is reset, and the mixed pump returns to normal operation.

[0023] Please see Figures 5-10 To achieve the assembly of the auxiliary spring assembly and the valve seat 101 body, this application provides an assembly device for the hydraulic end of a reciprocating oil-gas mixed-transfer pump. The state of the auxiliary spring assembly before assembly is shown in the attached diagram. Figure 9 For the status of the valve seat 101 body, please refer to [the documentation / reference]. Figure 10 It includes a valve seat 101, a valve, and a guide rod 103 thereon; subsequent suction valve spring 104, as well as fixed seat 111 and movable sleeve 106 and other components, which are assembled by subsequent processes; Please refer to the assembly equipment for the hydraulic end of a reciprocating oil-gas mixed-transfer pump. Figure 5 The system includes a machine base 201, an assembly conveyor belt 202 rotatably mounted on one side of the top of the machine base 201, a feeding conveyor belt 203 rotatably mounted on one end of the machine base 201, and the conveying direction of the feeding conveyor belt 203 is perpendicular to the conveying direction of the assembly conveyor belt. Several component placement racks 204 are fixedly mounted on the surface of the feeding conveyor belt 203, which is used to feed the auxiliary spring assembly. Several valve seat placement racks 205 are fixedly connected on the surface of the assembly conveyor belt, which is used to transport the valve seat 101. An assembly robotic arm 206 is provided in the middle of the machine base 201, which is used to pick up the auxiliary spring assembly and assemble it with the valve seat 101 body.

[0024] In one embodiment, see Figures 5-6 To enable the gripping and retrieval of the secondary spring assembly, the output end of the assembly robot arm 206 is equipped with a detection and gripping component. The detection and gripping component includes a drive motor 207, and the output end of the drive motor 207 is fixedly connected to a material picking sleeve 208. The inner diameter of the material picking sleeve 208 is larger than the diameter of the secondary spring seat 107 of the secondary spring assembly. An electrically controlled gripper 209 is fixedly installed inside the material picking sleeve 208. The secondary spring seat 107 is gripped by the electrically controlled gripper 209 to achieve the overall displacement of the secondary spring assembly. The specific structure of the electrically controlled gripper 209 is implemented with reference to existing technical means.

[0025] In one embodiment, see Figures 6-7To ensure that the secondary spring assembly applies a uniform force to the main spring assembly during operation, thus preventing uneven force distribution and tilting of the main spring assembly, which could affect the closing reaction speed of the valve plate 102 and increase wear on the mechanical mechanism, this application first inspects the structural condition of the secondary spring assembly before assembly. Specifically, a directional motor 210 is fixedly installed on the bottom edge of the material handling sleeve 208. A detection frame 211 is fixedly connected to the output end of the directional motor 210. A detection rod 213 is slidably connected inside the detection frame 211. A pressure sensor 216 is fixedly installed on the top of the inner wall of the detection frame 211. A return spring 215 is fixedly connected between the top of the detection rod 213 and the pressure sensor 216. An extension frame 212 is fixedly connected to the bottom of the detection rod 213, and a detection ball bearing 214 is rotatably installed on the bottom of the extension frame 212. When inspection is required, the directional motor 210 first drives... The rotating detection frame 211 drives the extension frame 212 to rotate inward towards the inside of the picking sleeve 208, aligning the detection ball 214 with the top of the secondary spring seat 107. Then, the assembly robot arm 206 drives the entire detection clamping assembly to move downward. Through the contact between the detection ball 214 and the secondary spring seat 107, the pressure sensor 216 detects the contact pressure between the two, which is recorded as the starting pressure. The drive motor 207 then drives the picking sleeve 208 to rotate, causing the detection roller to rotate along the top of the secondary spring seat 107. When the difference between the pressure sensor 216 reading and the starting pressure value exceeds the preset allowable deviation value, it is recorded as an abnormality of the secondary spring assembly. If the pressure sensor 216 reading stabilizes within the allowable deviation range, the reversing motor 210 drives the detection frame 211 and the extension frame 212 to reset, and the mechanical gripper picks up the secondary spring assembly and assembles it with the valve seat 101 body.

[0026] In one embodiment, see Figure 5 For abnormal secondary spring assemblies, the assembly robot arm 206 can remove them for disposal or for repair. This embodiment provides a feasible repair method. A repair component is provided at the other end of the top of the machine tool 201. The repair component includes a repair motor. The output end of the repair motor is fixedly connected to a repair grinding disc 217. The assembly robot arm 206 clamps and moves the secondary spring onto the repair grinding disc, so that the top surface of the displacement ring 110 contacts the repair grinding disc 217. The repair motor drives the repair grinding disc 217 to rotate, thereby rubbing the displacement ring 110. With the downward pressure of the assembly robot arm 206, the secondary spring assembly is repaired. After the repair is completed, another test is performed. If the test is qualified, the secondary spring assembly is assembled. If the test is still unqualified, it is discarded.

[0027] In one embodiment, see Figure 5 and Figure 8To clean the dressing grinding disc 217 and prevent debris and impurities attached to it from affecting the dressing operation, a cleaning frame 218 is provided on one side of the dressing grinding disc 217. One end of the cleaning frame 218 extends above the dressing grinding disc 217 and is fixedly connected to a cleaning pad 219. A cleaning port is opened on one side of the cleaning frame 218, and a cleaning pipe 220 is fixedly connected to the inner wall of the cleaning port. A return port is opened on the bottom side of the cleaning frame 218 away from the cleaning port, and a return pipe 221 is fixedly connected to the inner wall of the return port. The return pipe 221 is connected to a suction device to extract and remove impurities. The cleaning pipe 220 is connected to a water supply device to deliver clean water or polishing agent. At the same time, the introduction of clean water or polishing agent can also cool down the dressing grinding disc 217 and reduce the heat loss of the dressing grinding disc 217 and the secondary spring assembly.

[0028] The working principle of the assembly equipment of the present invention is as follows: the feeding conveyor belt 203 and the assembly conveyor belt work together to transport the auxiliary spring assembly and the valve seat 101 body through the surface component placement frame 204 and the valve seat placement frame 205 respectively. Then, the assembly robot arm 206 moves the end-mounted detection clamping assembly above the secondary spring assembly. The directional motor 210 drives the detection frame 211 to rotate, causing the extension frame 212 to rotate towards the inside of the picking sleeve 208, so that the detection ball 214 is aligned with the top surface of the secondary spring seat 107. The assembly robot arm 206 drives the detection clamping assembly downward, and the detection ball 214 contacts the top surface of the secondary spring seat 107. The pressure sensor 216 collects the contact pressure and calibrates it as the starting point pressure. The drive motor 207 drives the picking sleeve 208. 8. Rotate the detection roller to roll around the top surface of the secondary spring seat 107, and the pressure sensor 216 collects the contact pressure data. After the detection is completed, the directional motor 210 drives the detection frame 211 and the extension frame 212 to reset. The electrically controlled gripper 209 inside the material picking sleeve 208 clamps the secondary spring assembly. The assembly robot arm 206 drives the secondary spring assembly to the corresponding installation position of the valve seat 101 body and presses the secondary spring assembly into the movable cavity 108 at the bottom of the valve seat 101. The assembly conveyor belt sends the assembled valve seat 101 out of the work area. The auxiliary spring assembly determined to be abnormal is held by the assembly robot arm 206 via the electrically controlled gripper 209 and transferred to the trimming assembly work area. The assembly robot arm 206 moves the auxiliary spring assembly downward, so that the top surface of the displacement ring 110 contacts the trimming grinding disc 217. The trimming motor drives the trimming grinding disc 217 to rotate, polishing the top surface of the displacement ring 110. During the trimming process, the cleaning pipe 220 delivers clean water or polishing agent to the trimming grinding disc 217, the cleaning pad 219 scrapes off the debris on the surface of the trimming grinding disc 217, and the return pipe 221 extracts the waste liquid from the surface of the trimming grinding disc 217 through the return port. After the trimming is completed, the assembly robot arm 206 moves the auxiliary spring assembly back into the inspection process. The auxiliary spring assembly that fails the re-inspection is transferred by the assembly robot arm 206 for disposal.

[0029] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A hydraulic end of a reciprocating oil-gas mixed-transfer pump, comprising a valve housing (4), a cylinder liner, a piston, a piston rod (3), an intake valve assembly (1), and an exhaust valve assembly (5); wherein the intake valve assembly (1) comprises a valve seat (101), a valve plate (102), and a main spring assembly, characterized in that, The main spring assembly is located below the valve plate (102). The main spring assembly pulls the valve plate (102) down and makes it fit against the top surface of the valve seat (101). A secondary spring assembly is provided at the bottom of the valve seat (101). The secondary spring assembly is used to assist in pulling the valve plate (102) down.

2. The hydraulic end of the reciprocating oil-gas mixed-transfer pump as described in claim 1, characterized in that, A guide rod (103) is fixedly connected to the bottom of the valve plate (102), a movable sleeve (106) is fixedly connected to the middle of the guide rod (103), a movable ring is provided on the top edge of the movable sleeve (106), a fixed seat (111) is provided at the bottom of the guide rod (103), a fixed ring is fixedly connected to the edge of the fixed seat (111), and a suction valve spring (104) is fixedly connected between the top of the fixed ring and the bottom of the movable ring.

3. The hydraulic end of a reciprocating oil-gas mixed-transfer pump as described in claim 2, characterized in that, The secondary spring assembly includes a movable cavity (108) opened at the bottom of the valve seat (101), a positioning ring (109) is provided in the middle of the movable cavity (108), a displacement ring (110) is slidably connected inside the movable cavity (108), a secondary spring seat (107) is fixedly connected to the outer edge of the movable ring, and a closing spring (105) is fixedly connected between the top of the secondary spring seat (107) and the bottom of the displacement ring (110).

4. The hydraulic end of a reciprocating oil-gas mixed-transfer pump as described in claim 3, characterized in that, The stroke of the closing spring (105) is less than that of the suction valve spring (104), and the stiffness of the closing spring (105) is greater than that of the suction valve spring (104).

5. The hydraulic end of a reciprocating oil-gas mixed-transfer pump as described in claim 3, characterized in that, The top of the inner cavity of the active cavity (108) is provided with a feedback channel (112), one end of which is connected to the output end of the oil-gas mixed transport pump.

6. An assembly device for the hydraulic end of a reciprocating oil-gas mixed-transfer pump, characterized in that, The machine includes a machine base (201), an assembly conveyor belt (202) is rotatably mounted on one side of the top of the machine base (201), a feeding conveyor belt (203) is rotatably mounted on one end of the machine base (201), a number of component placement racks (204) are fixedly mounted on the surface of the feeding conveyor belt (203), a number of valve seat placement racks (205) are fixedly connected on the surface of the assembly conveyor belt, and an assembly robotic arm (206) is provided in the middle of the machine base (201).

7. The assembly equipment for the hydraulic end of a reciprocating oil-gas mixed-transfer pump as described in claim 6, characterized in that, The output end of the assembly robot arm (206) is provided with a detection clamping component, which includes a drive motor (207). The output end of the drive motor (207) is fixedly connected to a material picking sleeve (208), and an electrically controlled gripper (209) is fixedly installed inside the material picking sleeve (208).

8. The assembly equipment for the hydraulic end of a reciprocating oil-gas mixed-transfer pump as described in claim 7, characterized in that, A directional motor (210) is fixedly installed on the bottom edge of the material receiving sleeve (208). A detection frame (211) is fixedly connected to the output end of the directional motor (210). A detection rod (213) is slidably connected inside the detection frame (211). A pressure sensor (216) is fixedly installed on the top of the inner wall of the detection frame (211). A reset spring (215) is fixedly connected between the top of the detection rod (213) and the pressure sensor (216). An extension frame (212) is fixedly connected to the bottom of the detection rod (213). A detection ball (214) is rotatably installed on the bottom of the extension frame (212).

9. The assembly equipment for the hydraulic end of a reciprocating oil-gas mixed-transfer pump as described in claim 6, characterized in that, A trimming assembly is provided at the other end of the top of the machine (201). The trimming assembly includes a trimming motor, and the output end of the trimming motor is fixedly connected to a trimming grinding disc (217).

10. The assembly equipment for the hydraulic end of a reciprocating oil-gas mixed-transfer pump as described in claim 9, characterized in that, A cleaning rack (218) is provided on one side of the dressing grinding disc (217). One end of the cleaning rack (218) extends above the dressing grinding disc (217) and is fixedly connected to a cleaning pad (219). A cleaning port is provided on one side of the cleaning rack (218). A cleaning pipe (220) is fixedly connected to the inner wall of the cleaning port. A return port is provided on the bottom side of the cleaning rack (218) away from the cleaning port. A return pipe (221) is fixedly connected to the inner wall of the return port.

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