An electro-hydraulic servo digital pump

Abstract

The present invention belongs to the technical field of variable piston pumps, and specifically discloses an electro-hydraulic servo digital pump, comprising a connecting end cover, a housing, a rotary cradle, a transmission shaft and a cradle tilt control assembly, wherein the cradle tilt control assembly comprises a servo motor, a screw conveying rod, a mounting sleeve and a sliding sleeve, wherein the mounting sleeve is fixed in the connecting end cover, and the sliding sleeve is sealingly and slidingly connected in the mounting sleeve; the servo motor is connected to the screw conveying rod, and a sealing seat is provided between the servo motor and the screw conveying rod; the sliding sleeve is rotatably connected to the rotary cradle; the sealing seat, the sliding sleeve and the mounting sleeve form a thrust chamber; the mounting sleeve is provided with a first oil port and a second oil port, and the sliding sleeve is provided with a third oil port and a fourth oil port, and the connecting end cover realizes oil intercommunication with one side of the interior of the sliding sleeve through the first oil port and the second oil port, and realizes oil intercommunication with the other side of the interior of the sliding sleeve through the second oil port and the fourth oil port. The servo motor rotates to control the oil to push the sliding sleeve to extend outward or retract, thereby realizing the variable displacement of the variable pump.

Description

Technical Field

[0001] The invention belongs to the technical field of variable piston pumps, and in particular relates to an electro-hydraulic servo digital pump. Background Art

[0002] The variable piston pump is a commonly used hydraulic pump, which usually uses a variable swash plate mechanism and a plunger assembly to achieve the conversion of hydraulic energy. In a variable swash plate axial piston pump, the conversion of hydraulic energy is completed through the working interaction of the plunger and the swash plate. When the swash plate or the plunger rotates, the plunger moves along the working surface of the swash plate. By adjusting the inclination angle of the swash plate, the moving distance of the plunger between the working chamber and the pressure chamber can be changed, thereby adjusting the output flow of the pump. The larger the inclination angle of the swash plate, the greater the moving distance of the plunger, and the greater the output flow of the pump; conversely, the smaller the inclination angle of the swash plate, the smaller the output flow of the pump. .

[0003] With the development of science and technology, the demand for intelligent hydraulic systems has become more vigorous, prompting hydraulic pumps to develop in the direction of intelligence and digitization. Electro-hydraulic servo digital variable pumps can combine local control with networked control, and networking allows variable pumps to be managed in a networked manner. Summary of the invention

[0004] The object of the present invention is to provide an electro-hydraulic servo digital pump, which replaces a mechanical-hydraulic variable mechanism with an electro-hydraulic servo digital variable mechanism and adds sensors to improve the intelligence level of the pump.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the present invention is: an electro-hydraulic servo digital pump, including a connecting end cover, a shell, an adjusting mechanism, a slewing mechanism, a slewing cradle, a transmission shaft and a cradle tilt control assembly, one side of the connecting end cover is connected to the opening side of the shell; the adjusting mechanism, the slewing mechanism and the slewing cradle are installed in the shell; the connecting end cover is provided with an oil inlet channel and an oil outlet channel, and the side of the connecting end cover close to the shell is provided with an oil inlet port and an oil outlet port, and the oil inlet channel and the oil outlet channel are connected to the oil inlet port and the oil outlet port respectively; the slewing mechanism includes a cylinder body, a return disk and a plurality of groups of plungers, and the side of the cylinder body close to the connecting end cover is rotatably connected to the connecting end cover , the cylinder body is provided with a plurality of groups of sliding holes corresponding to the plungers one by one on the circumference of the cylinder body, and the length direction of the sliding holes is parallel to the axial direction of the cylinder body; the plunger is slidably connected in the sliding hole; the sliding hole can be directly opposite to and communicated with the oil inlet and the oil outlet; the side of the plunger away from the connecting end cover extends out of the cylinder body, and a sliding shoe is rotatably connected to the side of each group of plungers extending out of the cylinder body; the sliding shoe is a convex structure, and the plunger is rotatably connected to the convex end of the sliding shoe; the return plate is provided with a plurality of groups of sliding holes corresponding to the sliding shoes one by one on the circumference, the diameter of the sliding hole is smaller than the diameter of the bottom end of the sliding shoe and larger than the diameter of the convex end of the sliding shoe, and the convex end of the sliding shoe passes through the sliding hole, The return plate and the rotary cradle are respectively abutted against the two sides of the bottom end of the sliding shoe; a first through hole is provided at the center of the rotary cradle, a second through hole is provided at the center of the cylinder body, a third through hole is provided at the center of the connecting end cover, and a fourth through hole is provided on the shell; the opening area of ​​the first through hole is larger than the transmission shaft, and the transmission shaft passes through the fourth through hole, the first through hole, the second through hole and the third through hole in sequence, the transmission shaft is fixedly connected to the cylinder body, the transmission shaft is rotatably connected to the shell and the connecting end cover, and the transmission shaft is used to drive the rotary mechanism to rotate; one side of the adjusting mechanism is connected to the connecting end cover, and the other end is rotatably connected to one side of the rotary cradle; the cradle tilt control assembly is used to The other side of the rotary cradle is driven to move so as to tilt, and the adjustment mechanism can be extended and retracted; the cradle tilt control assembly comprises a servo motor, a screw conveying rod, a mounting sleeve and a sliding sleeve, the connecting end cover is provided with a mounting hole, the mounting sleeve is fixed in the mounting hole, the sliding sleeve is sealingly and slidingly connected in the mounting sleeve, and the screw conveying rod is located in the sliding sleeve; the servo motor is used to drive the screw conveying rod to rotate, and a sealing seat is provided between the servo motor and the screw conveying rod; one side of the sliding sleeve is located in the mounting sleeve, and the other side of the sliding sleeve extends out of the mounting sleeve and is rotationally connected to the rotary cradle; a thrust chamber is formed between the sealing seat, the sliding sleeve and the mounting sleeve;The first and second oil ports are provided on both sides of the mounting sleeve, and the third and fourth oil ports are provided on both sides of the sliding sleeve. The oil in the connecting end cover can communicate with one side of the interior of the sliding sleeve through the first and third oil ports, and can communicate with the other side of the interior of the sliding sleeve through the second and fourth oil ports. The spiral conveying rod can communicate the oil inside the sliding sleeve with the interior of the thrust chamber. A control board is provided on the housing, and the angle sensor and the servo motor are connected to the control board. ;

[0006] Furthermore, a fifth through hole is provided on the shell, and a rotation angle sensor is installed on the shell, and the rotation angle sensor is installed on the outside of the shell; a rotating shaft is rotatably connected in the fifth through hole, and a connecting shaft is connected to the rotating shaft; a driving block is connected to the rotating cradle, and the driving block is located on the rotation center axis of the rotating cradle; the connecting shaft is connected to the driving block; the rotation angle sensor is used to detect the rotation angle of the rotating shaft.

[0007] Furthermore, a pressure sensor connected to the control board is also provided on the housing, and a detection end of the pressure sensor is used to detect the pressure in the oil outlet channel.

[0008] Furthermore, a sealing ring is installed between the rotary shaft and the fifth through hole.

[0009] Furthermore, the servo motor is connected to the screw conveying rod via a coupling, and the coupling is provided with a thrust bearing and the sealing seat.

[0010] Furthermore, the adjustment mechanism includes a telescopic rod and a spring, one side of the telescopic rod is connected to the connecting end cover, and the other side is rotatably connected to the rotary cradle, the spring is sleeved on the outside of the telescopic rod, and both sides of the spring are fixed to both sides of the telescopic rod.

[0011] Furthermore, the control panel is connected to the control terminal via a network.

[0012] Furthermore, a first oil guide groove and a second oil guide groove are provided on both sides of the sliding sleeve, the first oil port is communicated with the first oil guide groove, and the third oil port is arranged in the first oil guide groove; the second oil port is communicated with the second oil guide groove, and the fourth oil port is arranged in the second oil guide groove; the middle part and both sides of the sliding sleeve are respectively sealed and slidably connected with the mounting sleeve.

[0013] The working principle of the present technical solution is: start the servo motor, the servo motor drives the spiral conveying rod to rotate, so that the oil in the connecting end cover can enter the spiral conveying rod through the first oil port, the first oil guide groove and the third oil port, and the spiral conveying rod conveys the oil into the thrust chamber, and the oil in the thrust chamber pushes the sliding sleeve to extend; or the spiral conveying rod conveys the oil in the thrust chamber back to the connecting end cover through the third oil port, the first oil guide groove and the first oil port, so that the sliding sleeve retracts. The extension and retraction of the sliding sleeve can drive the swinging cradle. The swinging cradle drives the rotating shaft to rotate through the driving block and the connecting shaft, and the angle sensor sends the rotation signal of the rotating shaft to the control board, thereby monitoring the tilting state of the swinging cradle. When the specified tilting state is reached, the control board turns off the servo motor.

[0014] The rotation of the transmission shaft drives the cylinder body to rotate, and the cylinder body drives the plunger to rotate. Due to the inclination of the rotary cradle, the plunger moves axially, and the volume of the cavity between the sliding hole and the cylinder body changes, thereby realizing oil suction and oil discharge. When suctioning oil, the oil enters the sliding hole from the oil inlet channel and the oil inlet port, and when discharging oil, the oil enters the oil outlet channel from the sliding hole and the oil outlet port and is discharged.

[0015] The beneficial effects of this technical solution are:

[0016] The servo motor rotates to make the control oil push the sleeve to extend or retract, thus realizing the variable pump variable. The electro-hydraulic servo digital variable mechanism replaces the mechanical-hydraulic variable mechanism, and the angle sensor and pressure sensor are added to improve the intelligence level of the pump. The local control can also be combined with the network control, and the network can make the pump network-based management. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the external structure of an electro-hydraulic servo digital pump of the present invention;

[0018] Figure 2 for Figure 1 The main view;

[0019] Figure 3 for Figure 1 Left view of;

[0020] Figure 4 for Figure 1 A top view of

[0021] Figure 5 for Figure 2 Horizontal cross-sectional view of

[0022] Figure 6 for Figure 2 A vertical sectional view of (the screw conveying rod is not shown);

[0023] Figure 7It is a cross-sectional view of the cradle tilt control assembly;

[0024] Figure 8 for Figure 1 Schematic diagram of the structure after removing the connecting end cover and the shell;

[0025] Fig. 9 for Figure 8 The main view;

[0026] Fig.10 It is the front view of the rotary cradle and the angle sensor;

[0027] Fig.11 It is a side view of the rotary cradle and the rotation angle sensor;

[0028] Fig.12 It is a top view of the rotary cradle and the angle sensor;

[0029] Fig.13 for Fig.11 A cross-sectional view of

[0030] Fig.14 It is a structural schematic diagram of the cylinder body in the rotary mechanism;

[0031] Fig.15 for Fig.14 The main view;

[0032] Fig.16 for Fig.14 Left view of;

[0033] Fig.17 for Fig.14 Right view of;

[0034] Fig.18 for Figure 1 A schematic diagram of the structure of the middle connection end cover;

[0035] Fig.19 for Fig.18 The main view;

[0036] Fig. 20 for Fig.18 Side view of. DETAILED DESCRIPTION

[0037] The following is further described in detail through specific implementation methods:

[0038] The reference numerals in the drawings of the specification include: connecting end cover 1, housing 2, control board 3, cradle tilt control assembly 4, oil outlet channel 5, pressure sensor 6, oil inlet channel 7, angle sensor 8, transmission shaft 9, rotary mechanism 10, adjustment mechanism 11, rotary cradle 12, servo motor 13, mounting sleeve 14, sealing seat 15, thrust bearing 16, screw conveying rod 17, sliding sleeve 18, sliding hole 19, plunger 20, sliding shoe 21, return plate 22, center spring 23, Thrust rod 24, first oil port 25, second oil port 26, third oil port 27, fourth oil port 28, first oil guide groove 29, second oil guide groove 30, thrust chamber 31, spline 32, thrust groove 33, oil inlet 34, oil outlet 35, rotary shaft 36, sealing ring 37, sealing groove 38, connecting shaft 39, driving block 40, first through hole 41, third through hole 42, second through hole 43, telescopic rod 44, spring 45, cylinder body 46, fixing plate 47, thrust plate 48.

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] The embodiment is basically as shown in the attached Figure 1-20 As shown: an electro-hydraulic servo digital pump, including a connecting end cover 1, a housing 2, an adjusting mechanism 11, a slewing mechanism 10, a slewing cradle 12, a transmission shaft 9 and a cradle tilt control assembly 4, one side of the connecting end cover 1 is connected to the open side of the housing 2 by bolts. The adjusting mechanism 11, the slewing mechanism 10 and the slewing cradle 12 are installed in the housing 2; the connecting end cover 1 is provided with an oil inlet channel 7 and an oil outlet channel 5, and the side of the connecting end cover 1 close to the housing 2 is provided with an oil inlet port 34 and an oil outlet port 35 (such as Fig.18 , 20 As shown), the oil inlet channel 7 and the oil outlet channel 5 are communicated with the oil inlet port 34 and the oil outlet port 35 respectively.

[0041] The rotary mechanism 10 includes a cylinder body 46, a return plate 22, and a plurality of groups of plungers 20. The cylinder body 46 is rotatably connected to the connecting end cover 1 at one side thereof close to the connecting end cover 1. The cylinder body 46 is provided with a plurality of groups of sliding holes 19 corresponding to the plungers 20 in a one-to-one manner in the circumferential direction thereof. The length direction of the sliding holes 19 is parallel to the axial direction of the cylinder body 46. The plungers 20 are slidably connected in the sliding holes 19; the sliding holes 19 can be directly opposite to and communicate with the oil inlet 34 and the oil outlet 35 (such as Figure 5As shown). The side of the plunger 20 away from the connection end cover 1 extends out of the cylinder body 46, and the side of each group of plungers 20 extending out of the cylinder body 46 is rotatably connected to the sliding shoe 21; the sliding shoe 21 is a convex structure, and the plunger 20 is rotatably connected to the convex end of the sliding shoe 21. The return plate 22 is provided with a plurality of groups of sliding holes corresponding to the sliding shoes 21 in the circumferential direction, and the diameter of the sliding hole is smaller than the diameter of the bottom end of the sliding shoe 21 and larger than the diameter of the convex end of the sliding shoe 21. The convex end of the sliding shoe 21 passes through the sliding hole and is rotatably connected to the plunger 20, and the return plate 22 and the rotary cradle 12 are respectively against the two sides of the bottom end of the sliding shoe 21.

[0042] A first through hole 41 is provided at the center of the rotary cradle 12, a second through hole 43 is provided at the center of the cylinder body 46, a third through hole 42 is provided at the center of the connecting end cover 1, and a fourth through hole is provided on the housing 2. The opening area of ​​the first through hole 41 is larger than that of the transmission shaft 9, and the transmission shaft 9 passes through the fourth through hole, the first through hole 41, the second through hole 43 and the third through hole 42 in sequence. The transmission shaft 9 is fixedly connected to the cylinder body 46, and a spline 32 is provided in the second through hole 43. The transmission shaft 9 is connected to the cylinder body 46 through the spline 32. The transmission shaft 9 is rotatably connected to the housing 2 and the connecting end cover 1 through a bearing, and the transmission shaft 9 is used to drive the rotary mechanism 10 to rotate.

[0043] The second through hole 43 is also provided with a thrust groove 33 (such as Fig.16 , 17 As shown), Figure 6 As shown, a thrust rod 24 is provided in the thrust groove 33, a fixed plate 47 is fixed to one side of the transmission shaft 9, and a thrust plate 48 is slidably connected to the other side, a center spring 23 is provided between the fixed plate 47 and the thrust plate 48, the thrust plate 48 is connected to one side of the thrust rod 24, and the other side of the thrust rod 24 is abutted against the return disk 22, thereby ensuring close contact between the return disk 22 and the rotary cradle 12.

[0044] One side of the adjusting mechanism 11 is connected to the connecting end cover 1, and the other end is rotatably connected to one side of the rotary cradle 12; the adjusting mechanism 11 can be telescopic, and the adjusting mechanism 11 includes a telescopic rod 44 and a spring 45, one side of the telescopic rod 44 is connected to the connecting end cover 1, and the other side is rotatably connected to the rotary cradle 12, the spring 45 is sleeved on the outside of the telescopic rod 44, and both sides of the spring 45 are fixed to both sides of the telescopic rod 44.

[0045] like Figure 6 , 7As shown, the cradle tilt control assembly 4 is used to drive one side of the rotary cradle 12 to move so as to tilt. The cradle tilt control assembly 4 includes a servo motor 13, a screw conveying rod 17, a mounting sleeve 14 and a sliding sleeve 18. A mounting hole is provided on the connecting end cover 1. The mounting sleeve 14 is fixed in the mounting hole. A sealing member is provided between the mounting sleeve 14 and the mounting hole. The sliding sleeve 18 is sealed and slidably connected in the mounting sleeve 14. The screw conveying rod 17 is located in the sliding sleeve 18. The servo motor 13 is used to drive the screw conveying rod 17 to rotate. The servo motor 13 and the screw conveying rod 17 are connected through a coupling. The coupling is provided with a thrust bearing 16 and a sealing seat 15. One side of the sliding sleeve 18 is located in the mounting sleeve 14, and the other side of the sliding sleeve 18 extends out of the mounting sleeve 14 and is rotatably connected to the rotary cradle 12. A thrust chamber 31 is formed between the sealing seat 15, the sliding sleeve 18 and the mounting sleeve 14. The mounting sleeve 14 is provided with a first oil port 25 and a second oil port 26 on both sides, the sliding sleeve 18 is provided with a third oil port 27 and a fourth oil port 28 on both sides, and the sliding sleeve 18 is also provided with a first oil guide groove 29 and a second oil guide groove 30 on both sides. The first oil port 25 is communicated with the first oil guide groove 29, and the third oil port 27 is arranged in the first oil guide groove 29; the second oil port 26 is communicated with the second oil guide groove 30, and the fourth oil port 28 is arranged in the second oil guide groove 30. The middle part and both sides of the sliding sleeve 18 are sealed and slidably connected with the mounting sleeve 14 respectively. The oil in the connecting end cover 1 can realize oil communication with one side of the interior of the sliding sleeve 18 through the first oil port 25, the first oil guide groove 30, and the third oil port 27, and can realize oil communication with the other side of the interior of the sliding sleeve 18 through the second oil port 26 and the fourth oil port 28. The screw conveying rod 17 can realize oil communication between the oil in the sliding sleeve 18 and the interior of the thrust chamber 31. The first oil port 25 and the second oil port 26 are communicated with the connection end cover 1 through pipelines.

[0046] like Figure 5 , 10 As shown in Figure 13, the housing 2 is provided with a fifth through hole, the housing 2 is provided with a rotation angle sensor 8, the rotation angle sensor 8 is installed on the outside of the housing 2, a rotary shaft 36 is rotatably connected in the fifth through hole, a sealing ring 37 is installed between the rotary shaft 36 and the fifth through hole, a sealing groove 38 is provided on the rotary shaft 36, and the sealing ring 37 is placed in the sealing groove 38. A connecting shaft 39 is connected to the rotary shaft 36; a driving block 40 is connected to the rotary cradle 12, and the driving block 40 is located on the rotation center axis of the rotary cradle 12; the connecting shaft 39 is connected to the driving block 40; the rotation angle sensor 8 is used to detect the rotation angle of the rotary shaft 36.

[0047] The housing 2 is also provided with a pressure sensor 6, the detection end of which is used to detect the pressure in the oil outlet channel 5. The housing 2 is provided with a control board 3, the pressure sensor 6, the rotation angle sensor 8 and the servo motor 13 are connected to the control board 3, and the control board 3 is connected to the control terminal through a network.

[0048] The parts in the entire pump body that need to be sealed are all sealed with seals to avoid leakage.

[0049] The specific implementation process is as follows:

[0050] The servo motor 13 is started, and the servo motor 13 drives the screw conveying rod 17 to rotate, so that the oil in the connecting end cover 1 can enter the screw conveying rod 17 through the first oil port 25, the first oil guide groove 29 and the third oil port 27, and the screw conveying rod 17 conveys the oil to the thrust chamber 31, and the oil in the thrust chamber 31 pushes the sleeve 18 to extend (the oil in the sleeve 18 will pass through the fourth oil port 28, the second oil guide groove 30, and the second oil port 26 to return to the connecting end cover 1); or the screw conveying rod 17 conveys the oil in the thrust chamber 31 back to the connecting end cover 1 through the third oil port 27, the first oil guide groove 29 and the first oil port 25, so that the sleeve 18 retracts (the oil in the connecting end cover 1 will pass through the second oil port 26, the second oil guide groove 30, and the fourth oil port 28 to flow into the sleeve 18). The extension and retraction of the sleeve 18 can drive the swing cradle 12 to swing. The rotary cradle 12 drives the rotary shaft 36 to rotate through the driving block 40 and the connecting shaft 39, and the rotation angle sensor 8 sends the rotation signal of the rotary shaft 36 to the control board 3, thereby monitoring the tilt state of the rotary cradle 12. When the specified tilt state is reached, the control board 3 turns off the servo motor 13.

[0051] The rotation of the transmission shaft 9 drives the cylinder body 46 to rotate, and the cylinder body 46 drives the plunger 20 to rotate. Due to the inclination of the rotary cradle 12, the plunger 20 moves axially, and the volume of the cavity between the sliding hole 19 and the cylinder body 46 changes, thereby realizing oil suction and oil discharge. When suctioning oil, the oil enters the sliding hole 19 from the oil inlet channel 7 and the oil inlet port 34, and when discharging oil, the oil enters the oil outlet channel 5 from the sliding hole 19 and the oil outlet port 35 and is discharged.

[0052] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0053] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An electro-hydraulic servo digital pump, characterized in that: The invention comprises a connecting end cover (1), a shell (2), an adjusting mechanism (11), a slewing mechanism (10), a slewing cradle (12), a transmission shaft (9) and a cradle tilt control assembly (4); one side of the connecting end cover (1) is connected to the opening side of the shell (2); the adjusting mechanism (11), the slewing mechanism (10) and the slewing cradle (12) are installed in the shell (2); an oil inlet channel (7) and an oil outlet channel (5) are provided on the connecting end cover (1); an oil inlet port (34) and an oil outlet port (35) are provided on a side of the connecting end cover (1) close to the shell (2); the oil inlet channel (7) and the oil outlet channel (5) are respectively connected to the oil inlet port (34) and the oil outlet port (35); the slewing mechanism (10) comprises a cylinder body ( 46), a return plate (22) and a plurality of groups of plungers (20); the cylinder body (46) is rotatably connected to the connecting end cover (1) on one side thereof; the cylinder body (46) is provided with a plurality of groups of sliding holes (19) corresponding to the plungers (20) in a one-to-one manner in the circumferential direction; the length direction of the sliding holes (19) is parallel to the axial direction of the cylinder body (46); the plungers (20) are slidably connected in the sliding holes (19); the sliding holes (19) can be directly opposite to and communicate with the oil inlet (34) and the oil outlet (35); the plungers (20) extend out of the cylinder body (46) on the side thereof away from the connecting end cover (1), and a sliding shoe ( 21); the sliding shoe (21) is a convex structure, and the plunger (20) is rotatably connected to the convex end of the sliding shoe (21); the return plate (22) is provided with a plurality of sliding holes corresponding to the sliding shoes (21) in a circumferential direction, the diameter of the sliding holes is smaller than the diameter of the bottom end of the sliding shoe (21) and larger than the diameter of the convex end of the sliding shoe (21), the convex end of the sliding shoe (21) passes through the sliding holes, and the return plate (22) and the rotary cradle (12) are respectively abutted against the two sides of the bottom end of the sliding shoe (21); a first through hole (41) is provided at the center of the rotary cradle (12), a second through hole (43) is provided at the center of the cylinder body (46), a third through hole (42) is provided at the center of the connecting end cover (1), and a a fourth through hole; the opening area of ​​the first through hole (41) is larger than that of the transmission shaft (9); the transmission shaft (9) passes through the fourth through hole, the first through hole (41), the second through hole (43) and the third through hole (42) in sequence; the transmission shaft (9) is fixedly connected to the cylinder body (46); the transmission shaft (9) is rotatably connected to the housing (2) and the connecting end cover (1); the transmission shaft (9) is used to drive the rotary mechanism (10) to rotate; one side of the adjustment mechanism (11) is connected to the connecting end cover (1), and the other end is rotatably connected to one side of the rotary cradle (12); the cradle tilt control assembly (4) is used to drive the other side of the rotary cradle (12) to move so as to tilt; the adjustment mechanism (11) can be extended and retracted;The cradle tilt control assembly (4) comprises a servo motor (13), a screw conveying rod (17), a mounting sleeve (14) and a sliding sleeve (18); a mounting hole is provided on the connecting end cover (1), the mounting sleeve (14) is fixed in the mounting hole, the sliding sleeve (18) is sealingly and slidingly connected in the mounting sleeve (14), and the screw conveying rod (17) is located in the sliding sleeve (18); the servo motor (13) is used to drive the screw conveying rod (17) to rotate, and a sealing seat (15) is provided between the servo motor (13) and the screw conveying rod (17); one side of the sliding sleeve (18) is located in the mounting sleeve (14), and the other side of the sliding sleeve (18) extends out of the mounting sleeve (14) and is rotatably connected to the rotary cradle (12); the sealing seat (15), the sliding sleeve (18) and the mounting sleeve (18) are A thrust chamber (31) is formed between the mounting sleeve (14); a first oil port (25) and a second oil port (26) are provided on both sides of the mounting sleeve (14); a third oil port (27) and a fourth oil port (28) are provided on both sides of the sliding sleeve (18); the oil in the connecting end cover (1) can communicate with one side of the interior of the sliding sleeve (18) through the first oil port (25) and the third oil port (27); and can communicate with the other side of the interior of the sliding sleeve (18) through the second oil port (26) and the fourth oil port (28); the spiral conveying rod (17) can communicate the oil in the interior of the sliding sleeve (18) with the interior of the thrust chamber (31); a control panel (3) is provided on the housing (2); the rotation angle sensor (8) and the servo motor (13) are connected to the control panel (3). ; 2. An electro-hydraulic servo digital pump according to claim 1, characterized in that: The shell (2) is provided with a fifth through hole, the shell (2) is provided with a rotation angle sensor (8), the rotation angle sensor (8) is provided outside the shell (2), a rotary shaft (36) is rotatably connected in the fifth through hole, the rotary shaft (36) is connected with a connecting shaft (39); the rotary cradle (12) is connected with a driving block (40), the driving block (40) is located on the rotation center axis of the rotary cradle (12); the connecting shaft (39) is connected with the driving block (40); the rotation angle sensor (8) is used to detect the rotation angle of the rotary shaft (36).

3. The electro-hydraulic servo digital pump according to claim 1, characterized in that: The housing (2) is also provided with a pressure sensor (6) connected to the control panel (3), and the detection end of the pressure sensor (6) is used to detect the pressure in the oil outlet channel (5).

4. The electro-hydraulic servo digital pump according to claim 2, characterized in that: A sealing ring (37) is installed between the rotary shaft (36) and the fifth through hole.

5. The electro-hydraulic servo digital pump according to claim 1, characterized in that: The servo motor (13) and the screw conveying rod (17) are connected via a coupling, and a thrust bearing (16) and the sealing seat (15) are provided on the coupling.

6. The electro-hydraulic servo digital pump according to claim 1, characterized in that: The adjustment mechanism (11) comprises a telescopic rod (44) and a spring (45); one side of the telescopic rod (44) is connected to the connecting end cover (1), and the other side is rotatably connected to the rotary cradle (12); the spring (45) is sleeved on the outside of the telescopic rod (44), and two sides of the spring (45) are fixed to two sides of the telescopic rod (44).

7. The electro-hydraulic servo digital pump according to claim 1, characterized in that: The control panel (3) is connected to the control terminal via a network.

8. The electro-hydraulic servo digital pump according to claim 1, characterized in that: A first oil guide groove (29) and a second oil guide groove (30) are provided on both sides of the sliding sleeve (18); the first oil port (25) is communicated with the first oil guide groove (29), and the third oil port (27) is arranged in the first oil guide groove (29); the second oil port (26) is communicated with the second oil guide groove (30), and the fourth oil port (28) is arranged in the second oil guide groove (30); the middle part and both sides of the sliding sleeve (18) are respectively connected to the mounting sleeve (14) in a sealing and sliding manner.

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