Single-cylinder double-acting hydraulic reciprocating pump and its regulation method

Abstract

A single-cylinder double-acting hydraulic reciprocating pump and a regulating method thereof, the hydraulic reciprocating pump comprising a hydraulic driving device and a valve box in driving connection with the hydraulic driving device, the valve box being in communication with a pulp inlet pipeline and a pulp outlet pipeline, the hydraulic driving device comprising a single-cylinder double-acting hydraulic cylinder, the single-cylinder double-acting hydraulic cylinder comprising a cylinder body, the valve box comprising a box body, one side of the box body being provided with a connecting flange seat, a cylindrical connecting barrel being connected between the cylinder body and the connecting flange seat, and the two end inner rings of the connecting barrel being in coupling and matching structure with the clamping grooves and the clamping teeth to be buckled and fixed with the connecting flange seat and the cylinder body, so that precise positioning is realized, the coaxiality requirement between the single-cylinder double-acting hydraulic cylinder and the valve box is ensured, bidirectional stress uniform transmission is realized, and the overall structural strength of the hydraulic reciprocating pump is significantly improved; the connecting barrel is further provided with reinforcing ribs, so that the impact resistance of the connecting barrel is further improved, and when maintenance is performed, only the corresponding components need to be disassembled, without damaging the overall structure, so that the maintenance convenience is ensured.

Description

TECHNICAL FIELD

[0001] The present application 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

[0002] At present, the hydraulic reciprocating pump mostly adopts a square pump body structure (such as the one shown in the accompanying drawings Figure 5 ), which is formed by welding various plates. The hydraulic cylinder part is rigidly connected to the valve box through bolts, or directly connected through welding. This pump body arrangement has the following problems. On the one hand, the structural strength is insufficient, and the square pump body is prone to stress concentration under high pressure (such as above 40 MPa), which causes deformation or cracking at the connection. On the other hand, the square pump body structure makes it inconvenient to maintain, as it needs to be disassembled with a large number of bolts or the welded parts need to be cut, which is time-consuming. In addition, the square pump body has poor sealing performance, and the multi-surface contact sealing structure is prone to leakage under high pressure.

[0003] The applicant previously applied for an application file with the publication number CN221373897U, which provides a hydraulic injection pump fluid end and a hydraulic injection pump, and proposes a circular connection scheme. However, due to the connection method, the upper limit of the pressure it can withstand is only about 35 MPa, and it will still deform under high-frequency impact. In addition, there is also a problem of stress concentration.

[0004] The applicant previously applied for an application file with the publication number CN117759515B, which discloses a whole single-acting hydraulic reciprocating pump. On the one hand, it is only suitable for single-cylinder single-acting and cannot meet the strength problem under double-acting. On the other hand, due to the connection structure, the pressure it can withstand is only about 52 MPa. SUMMARY

[0005] To solve the technical problems in the background art, the present application provides a single-cylinder double-acting hydraulic reciprocating pump and a control method thereof.

[0006] The technical scheme of the present application is as follows:

[0007] The present application first provides a single-cylinder double-acting hydraulic reciprocating pump, which comprises a hydraulic drive device and a valve box in transmission connection with the hydraulic drive device. The valve box is communicated with a pulp inlet pipeline and a pulp outlet pipeline. The hydraulic drive device can drive the valve box to work, and then complete the suction and discharge of the pulp through the pulp inlet pipeline and the pulp outlet pipeline.

[0008] Further, in order to ensure the working efficiency of the hydraulic reciprocating pump (one kind of single-cylinder double-acting hydraulic reciprocating pump), the hydraulic driving device comprises a single-cylinder double-acting hydraulic cylinder, which is provided with a reversing valve group capable of controlling the action thereof, the valve box is provided with two groups and is respectively drivingly 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, and the working efficiency of the hydraulic reciprocating pump is significantly improved.

[0009] As the core technical concept of the application, the valve box and the single-cylinder double-acting hydraulic cylinder are connected through the columnar connecting cylinder.

[0010] Specifically, the valve box comprises a box body, the slurry inlet pipeline and the slurry outlet pipeline are connected to the slurry inlet port and the slurry outlet port of the box body respectively, a hollow columnar guide cylinder is communicated to one side of the box body, and a plunger capable of driving the valve box to work is arranged in the guide cylinder, and the single-cylinder double-acting hydraulic cylinder comprises a cylinder body, and a piston shaft capable of reciprocating under the control of the reversing valve group is arranged in the cylinder body.

[0011] On the basis of the above structure, a connecting flange seat coaxial with the guide cylinder is bolted to one side of the box body provided with the guide cylinder, a plurality of annular clamping grooves are arranged in the inner ring of the two ends of the connecting cylinder, the outer ring of the side of the connecting flange seat away from the valve box and the outer ring of the two ends of the cylinder body are all provided with a plurality of annular clamping teeth capable of cooperating with the clamping grooves, the connecting cylinder is a two-piece split structure fixed by bolts, and the two ends are respectively fixed by the cooperation of the clamping grooves and the clamping teeth, and the connecting flange seat and the cylinder body are buckled and fixed, the end of the piston shaft is connected with the plunger through the connecting cylinder, and the inner ring of the connecting cylinder is further provided with an annular reinforcing rib, one end of the guide cylinder is fixed to the box body, and the other end is attached to the inner ring of the reinforcing rib.

[0012] Based on the above structure, the single-cylinder double-acting hydraulic cylinder and the valve box of the application are connected and fixed through the connecting cylinder, and the connecting mode of the connecting cylinder and the connecting flange seat and the cylinder body is coupling and fixing through the cooperation of the clamping grooves and the clamping teeth, which realizes accurate positioning, guarantees the coaxiality requirement between the single-cylinder double-acting hydraulic cylinder and the valve box, realizes uniform transmission of bidirectional stress, and significantly improves the overall structural strength of the hydraulic reciprocating pump; the design of the reinforcing rib in the connecting cylinder significantly improves the impact resistance of the connecting cylinder; the modular design makes the single-cylinder double-acting hydraulic cylinder, the valve box and the connecting cylinder all be separately detachable, only the corresponding bolts need to be disassembled during maintenance, without damaging the overall structure, thereby guaranteeing the maintenance convenience.

[0013] As described above, the single-cylinder double-acting hydraulic reciprocating pump is a preferred embodiment, in order to facilitate the observation of the connection state or action state of the piston shaft and / or the plunger, the connecting cylinder is further provided with an observation port capable of observing the action state of the piston shaft and / or the plunger.

[0014] As a preferred embodiment of the single-cylinder double-acting hydraulic reciprocating pump as described above, in order to ensure the coupling strength between the connecting cylinder and the connecting flange seat and the cylinder, the cross section of the clamping groove and the clamping tooth is a matching trapezoidal structure.

[0015] As a further preferred, in order to facilitate the adjustment of the stroke of the hydraulic reciprocating pump, the distance between the two adjacent clamping grooves and the two adjacent clamping teeth is the same, and on this basis, by adjusting the coupling and fixing mode of the connecting cylinder and the connecting flange seat and / or the cylinder, the distance between the valve box and the single-cylinder double-acting hydraulic cylinder can be realized, thereby realizing the adjustment of the stroke of the hydraulic reciprocating pump, and finally realizing the adjustment of the overall displacement of the machine.

[0016] Further preferably, in order to further ensure the coupling strength between the connecting cylinder and the connecting flange seat and the cylinder, and further ensure the stability of the overall work of the hydraulic reciprocating pump, a matching tooth is formed between the two adjacent clamping grooves, and the tooth surfaces of the clamping tooth and the matching tooth are nitrided.

[0017] As a single-cylinder double-acting hydraulic reciprocating pump as described above, in order to facilitate the repair and maintenance work of the hydraulic reciprocating pump, in terms of the structure of the valve box, one end of the guide cylinder penetrates through the connecting flange seat and is inserted with the box body, and a clamping sleeve is further arranged between the inner ring of the side of the connecting flange seat away from the valve box and the outer ring of the middle part of the guide cylinder.

[0018] As a single-cylinder double-acting hydraulic reciprocating pump as described above, in order to facilitate the effective regulation and control of the hydraulic reciprocating pump, and further ensure that its running state can be more safe and stable, the hydraulic reciprocating pump further comprises a controller in communication connection with the reversing valve group, and the inside of the connecting cylinder is provided with a plurality of sensors in communication connection with the controller and capable of detecting the action state of the piston shaft and / or the plunger.

[0019] The application also provides a regulation and control method based on the above-mentioned hydraulic reciprocating pump, which specifically comprises the following steps:

[0020] S1, selecting a coupling mechanism type on the man-machine interface of the controller, the coupling mechanism type including hydraulic type, connecting rod type and piston type, and the controller pre-stores a preset control model corresponding to each coupling mechanism type;

[0021] S2, the controller calls the preset control model corresponding to the selected coupling mechanism type to control the operation of the reversing valve group;

[0022] S3, selecting a working condition mode;

[0023] S4, the controller automatically calculates and generates an optimal acceleration curve of the reversing valve group according to the data obtained under the selected working condition mode, and controls the reversing valve group to continue operating;

[0024] S5, dynamically adjusting;

[0025] A, speed adjustment;

[0026] SA5.1, when the sensor detects that the actual speed of the piston shaft and / or the plunger deviates from the preset speed parameter by 5%, the controller outputs a PWM signal to the reversing valve group:

[0027] PWMout=Kp·e(t)+Ki·e(t)+Kd·e(t);

[0028] Wherein e(t) is the speed deviation, Kp=0.8, Ki=0.2, Kd=0.1;

[0029] SA5.2, the reversing valve group adjusts its action according to the received PWM signal;

[0030] B, fault protection;

[0031] When the sensor detects that the position of the piston shaft and / or the plunger deviates by more than 0.3mm within a preset time, the controller immediately controls the reversing valve group to slow down to a safety value, and simultaneously performs an alarm prompt;

[0032] The safety value is (200±L)mm / s, wherein L≤10.

[0033] The beneficial effects of the present application are:

[0034] 1)、The single-cylinder double-acting hydraulic reciprocating pump and its control method significantly improve the working efficiency of the hydraulic reciprocating pump through the cooperation of the single-cylinder double-acting hydraulic cylinder and the setting of the two valve boxes.

[0035] 2)、The single-cylinder double-acting hydraulic reciprocating pump and its control method realize precise positioning and ensure the coaxiality requirement between the single-cylinder double-acting hydraulic cylinder and the valve box, realize uniform transmission of bidirectional stress, and significantly improve the overall structural strength of the hydraulic reciprocating pump, through the coupling and fixing of the connecting cylinder, the connecting flange seat and the cylinder body by the cooperation of the clamping groove and the clamping teeth.

[0036] 3)、The single-cylinder double-acting hydraulic reciprocating pump and its control method significantly improve the impact resistance of the connecting cylinder through the design of the internal reinforcing ribs of the connecting cylinder.

[0037] 4)、The single-cylinder double-acting hydraulic reciprocating pump and its control method make the single-cylinder double-acting hydraulic cylinder, the valve box and the connecting cylinder all can be individually disassembled, only the corresponding bolts need to be disassembled during maintenance, without damaging the overall structure, ensuring the convenience of maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0038] The solutions and advantages of the present application will become clear to those of ordinary skill in the art from the following detailed description of the preferred embodiments, read in conjunction with the accompanying drawings. The accompanying drawings are merely schematic and are not intended to limit the scope of the present application.

[0039] In the drawings:

[0040] Figure 1 Structure schematic diagram of hydraulic reciprocating pump in the embodiment;

[0041] Figure 2 Top view of hydraulic reciprocating pump in the embodiment;

[0042] Figure 3 Schematic diagram of matching connection of connecting cylinder, connecting flange seat and valve box in the embodiment;

[0043] Figure 4 is Figure 3 Local enlarged structure schematic diagram of A in the embodiment;

[0044] Figure 5 Stress analysis diagram of existing square pump body;

[0045] Figure 6 Stress analysis diagram of cylindrical connecting cylinder in the embodiment;

[0046] Figure 7 Process schematic diagram of regulation and control method in the embodiment;

[0047] Components represented by each reference sign in the drawings are:

[0048] 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, pulp inlet pipeline; 8, pulp outlet pipeline; 9, second valve box; 10, connecting frame; 11, sensor; 12, reinforcing rib; 13, connecting flange seat; 14, clamping sleeve; 15, clamp. DETAILED DESCRIPTION

[0049] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings.

[0050] EMBODIMENT

[0051] The present embodiment first provides a single-cylinder double-acting hydraulic reciprocating pump, as shown in Figure 1 and Figure 2, including hydraulic drive device and with its transmission connection valve box, the valve box is communicated with the pulp pipeline 7 and the pulp pipeline 8, through the hydraulic drive device can drive the valve box work, in turn through the pulp pipeline 7 and the pulp pipeline 8 complete pulp suction and discharge work, the structure of the hydraulic reciprocating pump will be described in detail below.

[0052] In this embodiment, in order to ensure the working efficiency of the hydraulic reciprocating pump, the hydraulic drive device comprises a second support 5 and a single cylinder double acting hydraulic cylinder 4 arranged on the second support 5, the single cylinder double acting hydraulic cylinder 4 is connected with a reversing valve group 6 capable of controlling its action, the valve box is provided with two groups, two valve boxes are arranged on both sides of the hydraulic drive device through the first support 1, and are respectively in transmission connection with both ends of the single cylinder double acting hydraulic cylinder 4, the suction and discharge of pulp can be completed through the two valve boxes, which significantly improves the working efficiency of the hydraulic reciprocating pump.

[0053] Specifically, the single cylinder double acting hydraulic cylinder 4 comprises a cylinder body arranged on the second support 5, the reversing valve group 6 is connected to the cylinder body, the cylinder body is provided with a piston shaft reciprocatingly movable controlled by the reversing valve group 6; two groups of the valve box are respectively a first valve box 2 and a second valve box 9, and the first valve box 2 and the second valve box 9 are respectively in transmission connection with both ends of the single cylinder double acting hydraulic cylinder 4, both the valve boxes comprise a box body 201 arranged on the first support 1, the pulp pipeline 7 and the pulp pipeline 8 are respectively connected with the pulp inlet and the pulp outlet of the box body 201, the box body 201 is communicated with a hollow cylindrical guide cylinder 202 close to one side of the single cylinder double acting hydraulic cylinder 4, and the guide cylinder 202 is provided with a plunger 203 capable of driving the valve box to work, and the plunger 203 is in transmission connection with the piston shaft, the plunger 203 can be driven to work through the piston shaft, and in turn realizes the suction and discharge of pulp.

[0054] In this embodiment, combined with Figure 3 and Figure 4 , as the core technical concept of the present application, the valve box and the single cylinder double acting hydraulic cylinder 4 are connected through the cylindrical connecting cylinder 3.

[0055] Specifically, the box 201 is provided with a connecting flange seat 13 coaxial with the guide cylinder 202 on one side of the guide cylinder 202, the inner ring of the two ends of the connecting cylinder 3 is provided with a plurality of annular clamping grooves, the outer ring of the side of the connecting flange seat 13 away from the valve box, and the outer ring of the two ends of the cylinder body are all provided with a plurality of annular clamping teeth capable of cooperating with the clamping grooves, the connecting cylinder 3 is a two-piece split structure fixed by bolts, that is, the connecting cylinder 3 is jointly surrounded by two semicircular cylinder bodies, and the two ends of the connecting cylinder 3 are respectively fixed with the connecting flange seat 13 and the cylinder body through the cooperation of the clamping grooves and the clamping teeth, the piston shaft end is connected with the plunger 203 through the connecting cylinder 3, and 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 with the box 201, and the other end is attached to the inner ring of the reinforcing rib 12.

[0056] Based on the above structure, the single-cylinder double-acting hydraulic cylinder 4 and the valve box are connected and fixed through the connecting cylinder 3, and the connecting mode of the connecting cylinder 3 and the connecting flange seat 13 and the cylinder body is coupling and fixing through the cooperation of the clamping grooves and the clamping teeth, which realizes accurate positioning and guarantees the coaxiality requirement between the single-cylinder double-acting hydraulic cylinder 4 and the valve box, realizes uniform transmission of bidirectional stress, significantly improves the overall structural strength of the hydraulic reciprocating pump, and reduces the stress concentration of the cylindrical connecting cylinder 3 structure by more than 40% compared with the traditional square structure, improves the bending strength by 29%, and improves the fatigue life by 50%, as shown in Figure 5 and 6 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 the vibration deformation under high pressure; the modular design enables the single-cylinder double-acting hydraulic cylinder 4, the valve box and the connecting cylinder 3 to be individually disassembled, so that only the corresponding bolts need to be disassembled during maintenance, without damaging the overall structure, ensuring convenient maintenance, shortening the disassembly time by 50% without overall disassembly, and reducing the maintenance cost by 40% by independently maintaining the connecting cylinder 3, the piston shaft and the plunger 203; the use of the standardized connecting flange seat 13 can complete the disassembly and assembly using a conventional wrench, reducing the dependence on special tooling; moreover, the connecting 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 the interchangeability of φ270, φ250, φ230, φ220, φ180 and other different specifications of single-cylinder double-acting hydraulic cylinders 4, and a coupling structure can realize the free matching of various working conditions on site.

[0057] As a preferred embodiment of the present embodiment, an observation port for observing the connection state or action state of the piston shaft and / or the plunger 203 is reserved on the connecting cylinder.

[0058] In this embodiment, as a preferred embodiment, to ensure the coupling strength between the connecting cylinder 3 and the connecting flange seat 13 and the cylinder, the cross section of the clamping groove and the clamping tooth is a matching trapezoidal structure.

[0059] As a further preferred, to facilitate the adjustment of the stroke of the hydraulic reciprocating pump, the distance between the two adjacent clamping grooves and the two adjacent clamping teeth is the same, and on this basis, by adjusting the coupling and fixing mode or the coupling number of the connecting cylinder 3 and the connecting flange seat 13 and / or the cylinder, the depth of the connecting flange seat 13 / cylinder inserted into the connecting cylinder 3 can be adjusted to realize the adjustment of the distance between the valve box and the single-cylinder double-acting hydraulic cylinder 4, and then realize the adjustment of the stroke of the hydraulic reciprocating pump, and finally realize the adjustment of the displacement of the whole machine.

[0060] Further preferably, to further ensure the coupling strength between the connecting cylinder 3 and the connecting flange seat 13 and the cylinder, and further ensure the stability of the whole hydraulic reciprocating pump in operation, a matching tooth is formed between the two adjacent clamping grooves, the tooth surfaces of the clamping tooth and the matching tooth 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, the yield strength is ≥800MPa, and it can withstand 60MPa short-time overpressure impact.

[0061] In this embodiment, to further facilitate the disassembly and maintenance work of the hydraulic reciprocating pump, in terms of the structure of the valve box, the guide cylinder 202 passes through the connecting flange seat 13 and is inserted with the box body 201, a clamping sleeve 14 is further arranged between the inner ring of the side of the connecting flange seat 13 away from the valve box and the middle outer ring of the guide cylinder 202, and a clamping hoop 15 is further arranged on the middle outer ring of the guide cylinder 202 and abuts against the clamping sleeve 14 away from the valve box.

[0062] Further, to facilitate the effective regulation and control of the hydraulic reciprocating pump, and further ensure that its running state can be more safe and stable, the hydraulic reciprocating pump further comprises a controller in communication connection with the reversing valve group 6, and the inside of the connecting cylinder 3 is provided with multiple groups of sensors 11 in communication connection with the controller and capable of detecting the action state of the piston shaft and / or the plunger 203 through the connecting frame 10.

[0063] The embodiment also provides a regulation and control method based on the above-mentioned hydraulic reciprocating pump, in combination with Figure 7 , the regulation and control method specifically comprises the following steps:

[0064] S1, selecting a coupling mechanism type on the man-machine interface of the controller, the coupling mechanism type at least includes hydraulic type, connecting rod type and piston type, and the controller pre-stores a preset control model corresponding to the coupling mechanism type one by one;

[0065] S2, the controller calls the preset control model corresponding to the selected coupling mechanism type to control the operation of the reversing valve group 6;

[0066] S3, selection of working condition mode;

[0067] A, manual mode;

[0068] Manual input of stroke length and / or number of strokes data into the controller;

[0069] B, automatic mode;

[0070] Sensor 11 real-time feedback of piston shaft and / or plunger 203 action state data;

[0071] S4, the controller automatically calculates and generates the optimal acceleration curve (control curve) of the reversing valve group 6 according to the data obtained under the selected working condition mode, and controls the reversing valve group 6 to continue operation;

[0072] S5, dynamic adjustment of the reversing valve group 6;

[0073] A, speed adjustment;

[0074] 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:

[0075] PWMout=Kp·e(t)+Ki·e(t)+Kd·e(t);

[0076] Where e(t) is the speed deviation, Kp=0.8, Ki=0.2, Kd=0.1;

[0077] SA5.2, the reversing valve group 6 adjusts its action according to the received PWM signal;

[0078] B, fault protection;

[0079] When the sensor 11 detects that the position of the piston shaft and / or plunger 203 deviates by more than 0.3mm within a preset time, the controller immediately controls the reversing valve group 6 to slow down to a safety value, while giving an alarm prompt;

[0080] The safety value is (200±L) mm / s, where L≤10.

Claims

1. A single cylinder double acting hydraulic reciprocating pump characterized by, The hydraulic drive device comprises a single-cylinder double-acting hydraulic cylinder (4) provided with a reversing valve group (6) capable of controlling the action thereof, and the valve box is provided with two groups and is respectively drivingly 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 through a columnar connecting cylinder (3); The valve box comprises a box body (201), the pulp inlet pipeline (7) and the pulp outlet pipeline (8) are respectively connected with the pulp inlet and the pulp outlet of the box body (201), one side of the box body (201) is communicated with a hollow columnar guide cylinder (202), and the inside of the guide cylinder (202) is provided with a plunger (203) capable of driving the valve box to work; The single-cylinder double-acting hydraulic cylinder (4) comprises a cylinder body, and the inside of the cylinder body is provided with a piston shaft capable of reciprocating under the control of the reversing valve group (6); The side of the box body (201) provided with the guide cylinder (202) is bolted with a connecting flange seat (13) coaxial with the guide cylinder (202), the inner ring of the two ends of the connecting cylinder (3) is provided with a plurality of annular clamping grooves, the outer ring of the side of the connecting flange seat (13) away from the valve box and the outer ring of the two ends of the cylinder body are all provided with a plurality of annular clamping teeth capable of cooperating with the clamping grooves, the connecting cylinder (3) is a two-piece split structure fixed by bolts, and the two ends are respectively fixed with the connecting flange seat (13) and the cylinder body through the cooperation of the clamping grooves and the clamping teeth, and the end of the piston shaft is connected with the plunger (203) through the connecting cylinder (3); 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 with the box body (201), and the other end is attached to the inner ring of the reinforcing rib (12). The connecting cylinder (3) is further provided with an observation port capable of observing the action state of the piston shaft and / or the plunger (203).

2. A single cylinder double acting hydraulic reciprocating pump as claimed in claim 1 wherein, The cross section of the clamping groove and the clamping tooth is a matching trapezoidal structure.

3. A single cylinder double acting hydraulic reciprocating pump as claimed in claim 1 wherein, The distance between the adjacent two clamping grooves and the distance between the adjacent two clamping teeth are the same.

4. A single cylinder double acting hydraulic reciprocating pump as claimed in claim 3 wherein, The matching teeth are formed between the adjacent two clamping grooves, and the tooth surfaces of the clamping teeth and the matching teeth are nitrided.

5. A single cylinder double acting hydraulic reciprocating pump as claimed in claim 4 wherein, One end of the guide cylinder (202) penetrates through the connecting flange seat (13) and is inserted into the box body (201); 6. A single cylinder double acting hydraulic reciprocating pump as claimed in claim 1 wherein, The inner ring of the side of the connecting flange seat (13) away from the valve box and the middle outer ring of the guide cylinder (202) are further provided with a clamping sleeve (14), and the middle outer ring of the guide cylinder (202) is further provided with a clamping hoop (15) abutting against the side of the clamping sleeve (14) away from the valve box. Further comprising a controller in communication connection with the reversing valve group (6), and the inside of the connecting cylinder (3) is provided with a plurality of sensors (11) in communication connection with the controller and capable of detecting the action state of the piston shaft and / or the plunger (203).

7. A single cylinder double acting hydraulic reciprocating pump as claimed in any one of the claims 1 to 6, wherein, The method comprises the following steps:

8. A method of regulating, based on the single-cylinder double-acting hydraulic reciprocating pump of claim 7, characterized by, S1, selecting a coupling mechanism type on the man-machine interface of the controller, the coupling mechanism type comprises hydraulic type, connecting rod type and piston type, and the controller pre-stores a preset control model corresponding to the coupling mechanism type one by one; ​ S2, the controller calls the preset control model corresponding to the selected coupling mechanism type to control the operation of the reversing valve group (6); S3, selection of working condition mode; S4, the controller automatically calculates and generates the optimal acceleration curve of the reversing valve group (6) according to the data obtained in the selected working condition 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 the 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); Wherein e(t) is the speed deviation, Kp=0.8, Ki=0.2, Kd=0.1; SA5.2, the reversing valve group (6) adjusts its 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 >0.3mm within a preset time, the controller immediately controls the reversing valve group (6) to slow down to a safety value, and at the same time an alarm prompt is given; The safety value is (200±L) mm / s, wherein L≤10.

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