Single-cylinder double-acting hydraulic reciprocating pump and regulation and control method thereof

Abstract

The hydraulic reciprocating pump comprises a hydraulic driving device and a valve box in transmission connection with the hydraulic driving device, the valve box is communicated with a slurry inlet pipeline and a slurry outlet pipeline, the hydraulic driving device comprises a single-cylinder double-acting hydraulic cylinder, the single-cylinder double-acting hydraulic cylinder comprises a cylinder body, and the valve box comprises a box body. A connecting flange seat is arranged on one side of the single-cylinder double-acting hydraulic cylinder, a columnar connecting barrel is connected between the cylinder body and the connecting flange seat, and inner rings at the two ends of the connecting barrel are buckled and fixed with the connecting flange seat and the cylinder body through a coupling matching structure of clamping grooves and clamping teeth, so that accurate positioning is realized, and the requirement for coaxiality between the single-cylinder double-acting hydraulic cylinder and a valve box is met; uniform transmission of bidirectional stress is realized, and the overall structural strength of the hydraulic reciprocating pump is obviously improved; reinforcing ribs are further arranged in the connecting cylinder, the impact resistance effect of the connecting cylinder is further improved, meanwhile, only corresponding components need to be disassembled during maintenance, the whole structure does not need to be damaged, and maintenance convenience is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic pumps, in particular to a single-cylinder double-acting hydraulic reciprocating pump and a control method thereof. Background Art

[0002] At present, most hydraulic reciprocating pumps adopt square pump body structure (see the attached manual). Figure 5 ), the pump body is formed by welding multiple plates, and its hydraulic cylinder part is rigidly connected to the valve box by bolts, or directly connected by welding. This kind of pump body setting method, on the one hand, has insufficient structural strength, and the square pump body is prone to stress concentration under high pressure (such as above 40MPa), resulting in deformation or cracking of the connection; on the other hand, the structural setting of the square pump body makes it inconvenient to repair, and it is necessary to dismantle a large number of bolts or cut the welding parts, and maintenance is time-consuming; at the same time, the sealing performance of the square pump body is also poor, and the sealing structure with multi-plane contact is prone to leakage under high pressure.

[0003] The applicant's previous application, with publication number CN221373897U, provided a hydraulic injection pump hydraulic end and a hydraulic injection pump, and proposed a circular connection scheme. However, due to its connection method, its upper pressure limit can only reach around 35MPa, and it will still produce bending deformation under high-frequency impact, and there is also the problem of stress concentration.

[0004] The application document previously applied for by the applicant with publication number CN117759515B discloses an integral single-acting hydraulic reciprocating pump. On the one hand, it is only suitable for single-cylinder single-action and cannot meet the strength problem under double-action. On the other hand, it is limited by its connection structure, resulting in its pressure bearing capacity being only around 52MPa. Summary of the Invention

[0005] In order to solve the technical problems existing in the above background technology, the present invention provides a single-cylinder double-acting hydraulic reciprocating pump and a control method thereof.

[0006] The technical solutions of the present invention are as follows: The present invention first provides a single-cylinder double-acting hydraulic reciprocating pump, including a hydraulic drive device and a valve box connected to the hydraulic drive device. The valve box is connected to a slurry inlet pipeline and a slurry outlet pipeline. The hydraulic drive device can drive the valve box to work, and then the slurry is sucked in and discharged through the slurry inlet pipeline and the slurry outlet pipeline.

[0007] Furthermore, in order to ensure the working efficiency of the hydraulic reciprocating pump (the above-mentioned single-cylinder double-acting hydraulic reciprocating pump), the hydraulic drive device includes a single-cylinder double-acting hydraulic cylinder, which is provided with a reversing valve group capable of controlling its movement. The valve box is provided with two groups and is respectively connected to the two ends of the single-cylinder double-acting hydraulic cylinder. The suction and discharge of the slurry can be completed through the two valve boxes, which significantly improves the working efficiency of the hydraulic reciprocating pump.

[0008] As the core technical concept of the present invention, the valve box and the single-cylinder double-acting hydraulic cylinder are connected via a columnar connecting tube.

[0009] Specifically, the valve box includes a box body, the slurry inlet pipeline and the slurry outlet pipeline are respectively connected to the slurry inlet and slurry outlet of the box body, one side of the box body is connected to a hollow cylindrical guide cylinder, and a plunger is provided inside the guide cylinder to drive the valve box to work, and the single-cylinder double-acting hydraulic cylinder includes a cylinder body, inside which is provided a piston shaft that can be controlled to move back and forth by a reversing valve group.

[0010] On the basis of the above structure, the box body is provided with a guide cylinder on one side of which is bolted to a connecting flange seat coaxial with the guide cylinder, and the inner rings at both ends of the connecting cylinder are provided with a number of annular grooves, and the outer ring of the connecting flange seat on the side facing away from the valve box, as well as the outer rings at both ends of the cylinder body, are provided with a number of annular teeth that can cooperate with the grooves. The connecting cylinder is a two-piece split structure fixed by bolts, and the two ends are respectively fixed to the connecting flange seat and the cylinder body through the cooperation of the grooves and the teeth. The end of the piston shaft passes through the connecting cylinder and is connected to the plunger. The inner ring of the connecting cylinder is also provided with an annular reinforcing rib. One end of the guide cylinder is fixed to the box body, and the other end is fitted with the inner ring of the reinforcing rib.

[0011] Based on the above structure, the single-cylinder double-acting hydraulic cylinder and the valve box of the present invention are connected and fixed by a connecting tube, and the connection method between the connecting tube and the connecting flange seat and the cylinder body is coupled and fixed by the cooperation of the slot and the tooth, thereby achieving precise positioning and ensuring the coaxiality requirements between the single-cylinder double-acting hydraulic cylinder and the valve box, achieving uniform bidirectional force transmission, and significantly improving the overall structural strength of the hydraulic reciprocating pump; the design of the reinforcing ribs inside the connecting tube significantly improves the impact resistance of the connecting tube; the modular design enables the single-cylinder double-acting hydraulic cylinder, valve box and connecting tube to be disassembled separately. During maintenance, only the corresponding bolts need to be disassembled without destroying the overall structure, thereby ensuring maintenance convenience.

[0012] As a preferred embodiment of the single-cylinder double-acting hydraulic reciprocating pump described above, in order to facilitate observation of the connection status or action status of the piston shaft and / or plunger, an observation port for observing the action status of the piston shaft and / or plunger is also reserved on the connecting tube.

[0013] As a preferred embodiment of the single-cylinder double-acting hydraulic reciprocating pump described above, in order to ensure the coupling connection strength between the connecting cylinder and the connecting flange seat and the cylinder body, the cross-sections of the groove and the teeth are matched trapezoidal structures.

[0014] As a further preference, in order to facilitate the adjustment of the stroke of the hydraulic reciprocating pump, the distance between two adjacent slots and two adjacent teeth are the same. On this basis, by adjusting the coupling and fixing method of the connecting tube and the connecting flange seat and / or the cylinder body, the distance between the valve box and the single-cylinder double-acting hydraulic cylinder can be achieved, thereby achieving the adjustment of the stroke of the hydraulic reciprocating pump and ultimately achieving the adjustment of the displacement of the entire machine.

[0015] More preferably, in order to further ensure the coupling connection strength between the connecting tube and the connecting flange seat and the cylinder body, and thus ensure the overall working stability of the hydraulic reciprocating pump, a mating tooth is formed between two adjacent grooves, and the tooth surfaces of the meshing tooth and the mating tooth are both nitrided.

[0016] As described above, a single-cylinder double-acting hydraulic reciprocating pump, in order to further facilitate the disassembly and maintenance of the hydraulic reciprocating pump, specifically with respect to the structure of the valve box, one end of the guide cylinder passes through the connecting flange seat and is plugged into the box body, and a clamping sleeve is provided between the inner ring of the connecting flange seat on the side facing away from the valve box and the middle outer ring of the guide cylinder, and the middle outer ring of the guide cylinder is also provided with a clamp that presses against the side of the clamping sleeve facing away from the valve box.

[0017] As described above, a single-cylinder double-acting hydraulic reciprocating pump, in order to facilitate the effective regulation of the hydraulic reciprocating pump and thereby ensure that its operating state can be safer and more stable, the hydraulic reciprocating pump also includes a controller that is communicatively connected to the reversing valve group, and a plurality of groups of sensors that are communicatively connected to the controller and can detect the movement state of the piston shaft and / or plunger are provided inside the connecting cylinder.

[0018] The present invention also provides a control method, based on the above-mentioned hydraulic reciprocating pump, the control method specifically includes the following steps: S1. Select a coupling mechanism type on the controller's human-machine interface. The coupling mechanism types include hydraulic, connecting rod, and piston types. The controller has pre-stored preset control models corresponding to the coupling mechanism types. S2. The controller calls the corresponding preset control model according to the selected coupling mechanism type to control the operation of the reversing valve group; S3, selection of working mode; S4. The controller automatically calculates and generates the optimal acceleration curve of the reversing valve group based on the data obtained in the selected working mode, and controls the reversing valve group to continue operating; S5, dynamic adjustment; A. Speed ​​adjustment; SA5.1. When the sensor detects that the actual speed of the piston shaft and / or plunger deviates by 5% from the preset speed parameter, the controller outputs a PWM signal to the reversing valve group: PWMout=Kp·e(t)+Ki·e(t)+Kd·e(t); Where e(t) is the speed deviation, Kp=0.8, Ki=0.2, Kd=0.1; SA5.2, the reversing valve group adjusts its own action according to the received PWM signal; B. Fault protection; When the sensor detects that the position of the piston shaft and / or plunger is offset by more than 0.3mm within the preset time, the controller immediately controls the reversing valve group to slow down to a safe value and issues an alarm at the same time; The safety value is (200±L) mm / s, where L≤10.

[0019] The beneficial effects of the present invention are: 1) The present invention provides a single-cylinder double-acting hydraulic reciprocating pump and a control method thereof. The single-cylinder double-acting hydraulic cylinder is combined with two sets of valve boxes to significantly improve the working efficiency of the hydraulic reciprocating pump; 2) The present invention provides a single-cylinder double-acting hydraulic reciprocating pump and a control method thereof. The single-cylinder double-acting hydraulic cylinder and the valve box are connected and fixed by a connecting tube. The connection between the connecting tube, the connecting flange seat, and the cylinder body is coupled and fixed by the cooperation of a groove and a tooth. This achieves precise positioning, while ensuring the coaxiality requirements between the single-cylinder double-acting hydraulic cylinder and the valve box, realizing uniform bidirectional force transmission, and significantly improving the overall structural strength of the hydraulic reciprocating pump. 3) The present invention provides a single-cylinder double-acting hydraulic reciprocating pump and its control method, and the design of the internal reinforcing ribs of the connecting tube significantly improves the impact resistance of the connecting tube; 4) The present invention provides a single-cylinder double-acting hydraulic reciprocating pump and a control method thereof. The modular design enables the single-cylinder double-acting hydraulic cylinder, valve box and connecting tube to be disassembled separately. During maintenance, only the corresponding bolts need to be disassembled without destroying the overall structure, thereby ensuring convenient maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By reading the detailed description of the preferred embodiment below, the solutions and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only for illustrating the preferred embodiment and are not to be considered as limiting the present invention.

[0021] In the attached figure: Figure 1 Schematic diagram of the structure of the hydraulic reciprocating pump in the embodiment; Figure 2 A top view of the hydraulic reciprocating pump in the embodiment; Figure 3 Schematic diagram of the connection mode of the connecting cylinder, the connecting flange seat and the valve box in the embodiment; Figure 4 for Figure 3 Schematic diagram of the local enlarged structure at A in the middle; Figure 5 This is the stress analysis diagram of the existing square pump body; Figure 6 This is a stress analysis diagram of the cylindrical connecting tube in this embodiment; Figure 7 Schematic diagram of the process of the control method in the embodiment; The components represented by the reference numerals in the figure are: 1. First support; 2. First valve box; 201. Box body; 202. Guide cylinder; 203. Plunger; 3. Connecting cylinder; 4. Single-cylinder double-acting hydraulic cylinder; 5. Second support; 6. Reversing valve group; 7. Slurry inlet pipeline; 8. Slurry outlet pipeline; 9. Second valve box; 10. Connecting frame; 11. Sensor; 12. Reinforcement rib; 13. Connecting flange seat; 14. Ferrule; 15. Clamp. DETAILED DESCRIPTION

[0022] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0023] Example This embodiment first provides a single-cylinder double-acting hydraulic reciprocating pump, see Figure 1 and Figure 2 , including a hydraulic drive device and a valve box connected to the same, the valve box is connected to the slurry inlet pipeline 7 and the slurry outlet pipeline 8, the hydraulic drive device can drive the valve box to work, and then complete the slurry suction and discharge work through the slurry inlet pipeline 7 and the slurry outlet pipeline 8. The structure of the hydraulic reciprocating pump is described in detail below with reference to the accompanying drawings.

[0024] In this embodiment, in order to ensure the working efficiency of the hydraulic reciprocating pump, the hydraulic drive device includes a second support 5 and a single-cylinder double-acting hydraulic cylinder 4 arranged thereon. The single-cylinder double-acting hydraulic cylinder 4 is connected to a reversing valve group 6 that can control its action. The valve box is provided with two groups. The two valve boxes are arranged on both sides of the hydraulic drive device through the first support 1, and are respectively connected to the two ends of the single-cylinder double-acting hydraulic cylinder 4 through transmission. The suction and discharge of the slurry can be completed through the two valve boxes, which significantly improves the working efficiency of the hydraulic reciprocating pump.

[0025] Specifically, the single-cylinder double-acting hydraulic cylinder 4 includes a cylinder body arranged on the second support 5, the reversing valve group 6 is connected to the cylinder body, and the interior of the cylinder body is provided with a piston shaft extending out of the cylinder body at both ends and capable of being controlled to move back and forth by the reversing valve group 6; the two groups of valve boxes are respectively the first valve box 2 and the second valve box 9, and the first valve box 2 and the second valve box 9 are respectively transmission-connected to the two ends of the single-cylinder double-acting hydraulic cylinder 4, and the two valve boxes both include a box body 201 arranged on the first support 1, the slurry inlet pipeline 7 and the slurry outlet pipeline 8 are respectively connected to the slurry inlet and slurry outlet of the box body 201, and the box body 201 is connected to a hollow cylindrical guide cylinder 202 on the side close to the single-cylinder double-acting hydraulic cylinder 4, and a plunger 203 that can drive the valve box to work is provided inside the guide cylinder 202, and the plunger 203 is transmission-connected to the piston shaft, and the plunger 203 can be driven to move by the piston shaft, thereby realizing the suction and discharge of the slurry.

[0026] In this embodiment, combined with Figure 3 and Figure 4 As the core technical concept of the present invention, the valve box and the single-cylinder double-acting hydraulic cylinder 4 are connected through a cylindrical connecting tube 3.

[0027] Specifically, one side of the guide cylinder 202 is provided on the box body 201, and a connecting flange seat 13 coaxial with the guide cylinder 202 is bolted to it. The inner rings of both ends of the connecting cylinder 3 are provided with a number of annular grooves. The outer ring of the connecting flange seat 13 facing away from the valve box, as well as the outer rings of both ends of the cylinder body, are provided with a number of annular teeth that can cooperate with the grooves. The connecting cylinder 3 is a two-piece split structure fixed by bolts, that is, the connecting cylinder 3 is composed of two cylinders with semicircular cross-sections. The two ends of the connecting cylinder 3 are respectively fixed to the connecting flange seat 13 and the cylinder body through the cooperation of the grooves and the teeth. The end of the piston shaft passes through the connecting cylinder 3 and is connected to the plunger 203. The inner ring of the connecting cylinder 3 is also provided with an annular reinforcing rib 12. One end of the guide cylinder 202 is fixed to the box body 201, and the other end is fitted with the inner ring of the reinforcing rib 12.

[0028] Based on the above structure, the single-cylinder double-acting hydraulic cylinder 4 and the valve box of the present invention are connected and fixed by the connecting tube 3, and the connection method of the connecting tube 3, the connecting flange seat 13 and the cylinder body is coupled and fixed by the cooperation of the card groove and the card tooth, thereby achieving precise positioning, while ensuring the coaxiality requirements between the single-cylinder double-acting hydraulic cylinder 4 and the valve box, achieving uniform bidirectional force transmission, and significantly improving the overall structural strength of the hydraulic reciprocating pump. The cylindrical connecting tube 3 structure reduces stress concentration by more than 40% compared with the traditional square structure, increases bending strength by 29%, and increases fatigue life by 50%. Figure 5 and 6As shown; the design of the reinforcing rib 12 inside the connecting cylinder 3 significantly improves the impact resistance of the connecting cylinder 3, increases the overall rigidity by 25%, and reduces vibration deformation under high pressure; the modular design allows the single-cylinder double-acting hydraulic cylinder 4, the valve box and the connecting cylinder 3 to be disassembled separately. During maintenance, only the corresponding bolts need to be disassembled without destroying the overall structure, ensuring convenient maintenance. Without the need for overall disassembly, the disassembly and assembly time is shortened by 50%. At the same time, the connecting cylinder 3, the piston shaft, the plunger 203 and other vulnerable parts can be maintained independently, reducing the maintenance cost by 40%. The standard The connection flange seat 13 is connected with the standardized connection, and the disassembly and assembly can be completed using a conventional wrench, reducing the dependence on special tooling; moreover, the matching connection method of the connection flange seat 13 adopts a universal design, which can realize the free matching of low-pressure (≤35MPa), medium-pressure (35MPa~52MPa), and high-pressure (≥52MPa) valve boxes, and at the same time can realize the interchange of single-cylinder double-acting hydraulic cylinders 4 of different specifications such as φ270, φ250, φ230, φ220, and φ180. The use of a coupling structure can realize free matching of various working conditions on site.

[0029] As a preferred implementation of this embodiment, in order to facilitate observation of the connection status or action status of the piston shaft and / or plunger 203, an observation port for observing the action status of the piston shaft and / or plunger 203 is reserved on the connecting tube.

[0030] In this embodiment, as a preferred implementation, in order to ensure the coupling connection strength between the connecting tube 3 and the connecting flange seat 13 and the cylinder body, the cross-sections of the clamping groove and the clamping teeth are matched trapezoidal structures.

[0031] As a further preference, in order to facilitate the adjustment of the stroke of the hydraulic reciprocating pump, the distance between two adjacent slots and two adjacent teeth is the same. On this basis, by adjusting the coupling and fixing method, or the coupling quantity, of the connecting tube 3 and the connecting flange seat 13 and / or the cylinder body, the depth of the connecting flange seat 13 / cylinder body inserted into the connecting tube 3 can be adjusted to achieve the adjustment of the distance between the valve box and the single-cylinder double-acting hydraulic cylinder 4, thereby achieving the adjustment of the stroke of the hydraulic reciprocating pump and ultimately achieving the adjustment of the displacement of the entire machine.

[0032] More preferably, in order to further ensure the coupling connection strength between the connecting cylinder 3 and the connecting flange seat 13 and the cylinder body, and thus ensure the stability of the overall operation of the hydraulic reciprocating pump, mating teeth are formed between the two adjacent grooves, and the tooth surfaces of the meshing teeth and the mating teeth are nitrided. The connecting cylinder 3 is made of 42CrMo alloy steel and is subjected to quenching and tempering heat treatment. The tensile strength is ≥1000MPa and the yield strength is ≥800MPa. It can withstand a short-term overpressure shock of 60MPa.

[0033] In this embodiment, in order to further facilitate the disassembly and maintenance of the hydraulic reciprocating pump, specifically speaking of the structure of the valve box, one end of the guide cylinder 202 passes through the connecting flange seat 13 and is plugged into the box body 201. A clamping sleeve 14 is provided between the inner ring of the connecting flange seat 13 on the side facing away from the valve box and the middle outer ring of the guide cylinder 202. The middle outer ring of the guide cylinder 202 is also provided with a clamp 15 that presses against the clamping sleeve 14 on the side facing away from the valve box.

[0034] Furthermore, in order to facilitate the effective regulation of the hydraulic reciprocating pump and thereby ensure that its operating state can be safer and more stable, the hydraulic reciprocating pump also includes a controller that is communicatively connected to the reversing valve group 6, and the interior of the connecting cylinder 3 is provided with multiple groups of sensors 11 that are communicatively connected to the controller through the connecting frame 10 and can detect the movement state of the piston shaft and / or plunger 203.

[0035] This embodiment also provides a control method based on the above hydraulic reciprocating pump, combined with Figure 7 , the control method specifically includes the following steps: S1. Selecting a coupling mechanism type on the controller's human-machine interface. The coupling mechanism types include at least hydraulic, connecting rod, and piston types. The controller has pre-stored preset control models corresponding to the coupling mechanism types. S2. The controller calls the corresponding preset control model according to the selected coupling mechanism type to control the operation of the reversing valve group 6; S3, selection of working mode; A. Manual mode; Manually input the stroke length and / or stroke quantity data into the controller; B. Automatic mode; The sensor 11 provides real-time feedback of the piston shaft and / or plunger 203 action status data; S4. The controller automatically calculates and generates the optimal acceleration curve (control curve) of the reversing valve group 6 based on the data obtained in the selected working mode, and controls the reversing valve group 6 to continue operating; S5, dynamic adjustment of reversing valve group 6; A. Speed ​​adjustment; SA5.1. When sensor 11 detects that the actual speed of the piston shaft and / or plunger 203 deviates by 5% from the preset speed parameter, the controller outputs a PWM signal to the reversing valve assembly 6: PWMout=Kp·e(t)+Ki·e(t)+Kd·e(t); Where e(t) is the speed deviation, Kp=0.8, Ki=0.2, Kd=0.1; SA5.2, reversing valve group 6 adjusts its own action according to the received PWM signal; B. Fault protection; When the sensor 11 detects the position of the piston shaft and / or plunger 203, and the offset within the preset time is greater than 0.3 mm, the controller immediately controls the reversing valve group 6 to slow down to a safe value and issues an alarm; The safety value is (200±L) mm / s, where L≤10.

Claims

1. A single-cylinder double-acting hydraulic reciprocating pump, characterized in that: It comprises a hydraulic drive device and a valve box connected thereto in transmission, wherein the valve box is connected to a pulp inlet pipeline (7) and a pulp outlet pipeline (8); The hydraulic drive device comprises a single-cylinder double-acting hydraulic cylinder (4), which is provided with a reversing valve group (6) capable of controlling its movement, and the valve box is provided with two groups and is respectively connected to the two ends of the single-cylinder double-acting hydraulic cylinder (4); The valve box and the single-cylinder double-acting hydraulic cylinder (4) are connected via a columnar connecting tube (3); The valve box comprises a box body (201), the pulp inlet pipeline (7) and the pulp outlet pipeline (8) are respectively connected to the pulp inlet and pulp outlet of the box body (201), one side of the box body (201) is connected to a hollow cylindrical guide cylinder (202), and a plunger (203) capable of driving the valve box to work is provided inside the guide cylinder (202); The single-cylinder double-acting hydraulic cylinder (4) comprises a cylinder body, inside of which is provided a piston shaft capable of being controlled to move back and forth by a reversing valve group (6); The box body (201) is provided with a guide cylinder (202) on one side of which a connecting flange seat (13) coaxial with the guide cylinder (202) is bolted, and the inner rings at both ends of the connecting cylinder (3) are provided with a plurality of annular grooves, and the outer ring of the connecting flange seat (13) on the side facing away from the valve box, as well as the outer rings at both ends of the cylinder body, are provided with a plurality of annular teeth capable of cooperating with the grooves, and the connecting cylinder (3) is a two-piece split structure fixed by bolts, and the two ends are respectively fixed to the connecting flange seat (13) and the cylinder body by cooperating with the grooves and the teeth, and the end of the piston shaft passes through the connecting cylinder (3) and is connected to the plunger (203); The inner ring of the connecting cylinder (3) is further provided with an annular reinforcing rib (12); one end of the guide cylinder (202) is fixed to the box body (201), and the other end is fitted to the inner ring of the reinforcing rib (12).

2. A single-cylinder double-acting hydraulic reciprocating pump according to claim 1, characterized in that: An observation port is also reserved on the connecting cylinder (3) for observing the operating state of the piston shaft and / or the plunger (203).

3. A single-cylinder double-acting hydraulic reciprocating pump according to claim 1, characterized in that: The cross sections of the latching slot and the latching teeth are matched trapezoidal structures.

4. A single-cylinder double-acting hydraulic reciprocating pump according to claim 3, characterized in that: The distances between two adjacent slots and two adjacent teeth are the same.

5. A single-cylinder double-acting hydraulic reciprocating pump according to claim 4, characterized in that: A matching tooth is formed between two adjacent clamping grooves, and the tooth surfaces of the clamping tooth and the matching tooth are both nitrided.

6. The single-cylinder double-acting hydraulic reciprocating pump according to claim 1, characterized in that: One end of the guide cylinder (202) passes through the connecting flange seat (13) and is plugged into the box body (201); A clamping sleeve (14) is provided between the inner ring of the connecting flange seat (13) on the side facing away from the valve box and the middle outer ring of the guide cylinder (202). The middle outer ring of the guide cylinder (202) is also provided with a clamping hoop (15) that presses against the clamping sleeve (14) on the side facing away from the valve box.

7. A single-cylinder double-acting hydraulic reciprocating pump according to any one of claims 1 to 6, characterized in that: It also includes a controller that is communicatively connected to the reversing valve group (6), and the connecting cylinder (3) is internally provided with a plurality of sensors (11) that are communicatively connected to the controller and capable of detecting the operating state of the piston shaft and / or the plunger (203).

8. A control method, based on the single-cylinder double-acting hydraulic reciprocating pump according to claim 7, characterized in that: The steps include: S1. Select a coupling mechanism type on the controller's human-machine interface. The coupling mechanism types include hydraulic, connecting rod, and piston types. The controller has pre-stored preset control models corresponding to the coupling mechanism types. S2, the controller calls the corresponding preset control model according to the selected coupling mechanism type to control the operation of the reversing valve group (6); S3, selection of working mode; S4, the controller automatically calculates and generates an optimal acceleration curve for the reversing valve group (6) based on the data obtained in the selected working mode, and controls the reversing valve group (6) to continue operating; S5, dynamic adjustment; A. Speed ​​adjustment; SA5.

1. When the sensor (11) detects that the actual speed of the piston shaft and / or plunger (203) deviates from the preset speed parameter by 5%, the controller outputs a PWM signal to the reversing valve group (6): PWMout=Kp·e(t)+Ki·e(t)+Kd·e(t); Where e(t) is the speed deviation, Kp=0.8, Ki=0.2, Kd=0.1; SA5.2, the reversing valve group (6) adjusts its own action according to the received PWM signal; B. Fault protection; When the sensor (11) detects that the position of the piston shaft and / or the plunger (203) deviates by more than 0.3 mm within a preset time, the controller immediately controls the reversing valve group (6) to decelerate to a safe value and issues an alarm. The safety value is (200±L) mm / s, where L≤10.

Images