Hydraulic thruster

Abstract

The present invention belongs to the technical field of hydraulic components, specifically a hydraulic thruster, including a digital oil cylinder, a control valve is provided at one end of the digital oil cylinder, and the digital oil cylinder and the control valve are connected by an oil pipe. The oil groove of the valve core of the present invention adopts an inclined design, so that the movable connection between the valve core and the valve sleeve can be sealed and separated by a sealing ring, reducing the subsequent maintenance cost; by controlling the rotation of the oil groove of the valve core to match the oil hole on the valve sleeve, the oil circuit of the device can be freely switched to accurately and flexibly control the digital oil cylinder; the problem that the valve core needs to rotate and match the linear motion to switch the oil circuit is solved, and one set of screw rods is eliminated, reducing the accuracy problem caused by the screw rod's own tolerance, while making assembly and maintenance work simpler and improving control accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic components, in particular to a hydraulic thruster. Background Art

[0002] Hydraulic thruster is a hydraulic component that controls the movement of piston rods through hydraulic power. Hydraulic components are widely used in industry, especially in the field of linear motion, because of their heavy-duty, smooth, impact-resistant and reliable performance. With the rapid development of science and technology, automation and digitalization have become a mainstream, and digital cylinders as such hydraulic components are also increasingly used.

[0003] Digital cylinder technology has been proposed in recent years with the development of information technology and the rise of intelligent manufacturing. Its ingenious structural design combines cylinders, valves, feedback and control organically to form a completely digital motion characteristic. Not only does its composition simplify the original hydraulic system engineering into one component, but it also greatly simplifies the design, debugging, use and maintenance. It reduces the impact of the use environment through a set of mechanical internal feedback devices, realizes the precise and stable control of the stroke of the large-load hydraulic cylinder by a small-power motor, and greatly reduces the application threshold and cost of high-performance motion control systems.

[0004] Therefore, the digital cylinder is the technical core of the hydraulic thruster. At present, there are two most widely used digital cylinder technologies: one is to change the driving unit of the traditional electromagnetic control valve from electromagnetic to motor, one end of the valve core is connected to the servo motor, and the other end is directly controlled by connecting to the ball screw of the mechanical feedback device of the digital cylinder through the screw rod. The other is to add a valve sleeve to the control valve of the digital cylinder, so that multiple radially rotatable oil chambers are made between the valve core and the valve sleeve, the valve sleeve is connected to the screw rod in the digital cylinder, and the valve core is connected to the motor.

[0005] The control oil circuit of the first type of hydraulic thruster requires the valve core to rotate and move in a straight line to complete the switching action. Since the device uses two sets of screw connections and there is a certain space matching requirement between the screws, poor matching will cause the digital cylinder to not work properly or the valve to be damaged. Therefore, it is difficult to assemble and has poor control accuracy. The control oil circuit of the second type of hydraulic thruster only requires the valve core to rotate to complete the switching, but because the oil chambers in the oil circuit are arranged radially, its oil chamber separation seal cannot directly use a sealing ring, but needs to customize a special shape of seal or use an oil film seal. There are many restrictions on use, and the maintenance cost is high after long-term use. Summary of the invention

[0006] The present invention provides a hydraulic thruster to solve the technical problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a hydraulic thruster includes a digital oil cylinder, a control valve is arranged at one end of the digital oil cylinder, the digital oil cylinder and the control valve are connected through an oil pipe, the control valve includes a valve body, a rear end cover is arranged at one end of the valve body, and a front end cover is arranged at the other end, a valve sleeve is rotatably installed in the valve body, a valve core is rotatably installed in the valve sleeve, the valve body is connected to the motor through the rear end cover, the valve body is connected to the digital oil cylinder through the front end cover, the output end of the motor extends into the valve body and is connected to the valve core, annular grooves are arranged on the side wall of the valve sleeve in sequence, an oil hole is penetrated at the same position in each annular groove, and a valve body is arranged on the side wall of the valve body. An oil port corresponding to each annular groove, oil grooves adapted to each oil hole are sequentially arranged on the side wall of the valve core, and each oil groove is inclined. Sealing rings adapted to the inner wall of the valve body are arranged at intervals on the side wall of the valve sleeve, and sealing rings adapted to the inner wall of the valve sleeve are arranged at intervals on the side wall of the valve core. The digital oil cylinder includes a cylinder body, a front cylinder cover is arranged at one end of the cylinder body, a rear cylinder cover is arranged at the end of the cylinder body away from the front cylinder cover, a piston rod is movably installed in the cylinder body, a screw rod is arranged in the piston rod, a piston adapted to the inner wall of the cylinder body is arranged at the end of the piston rod close to the control valve, a screw nut adapted to the screw rod is arranged in the piston, and the end of the valve sleeve away from the motor is connected to the screw rod.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention adopts an inclined design for the oil groove of the valve core of the device through the coordinated action of the digital oil cylinder, control valve, valve body, valve sleeve, valve core and other structures, so that the movable connection between the valve core and the valve sleeve can be sealed and separated by a sealing ring, thereby reducing the subsequent maintenance cost; by controlling the rotation of the oil groove of the valve core to cooperate with the oil hole on the valve sleeve, the oil circuit of the device can be switched freely to accurately and flexibly control the digital oil cylinder; the problem that the valve core needs to rotate and move in a straight line to switch the oil circuit is solved, one set of screw rods is eliminated, and the accuracy problem caused by the tolerance of the screw rod itself is reduced, while making the assembly and maintenance work simpler and improving the control accuracy.

[0009] As a further improvement of the above scheme, the annular groove includes: a first annular groove, a second annular groove, a third annular groove, a fourth annular groove, and a fifth annular groove, and the annular grooves are parallel to each other and have the same size.

[0010] The technical effect of the above improvement is: through the arrangement of the first annular groove, the second annular groove, the third annular groove, the fourth annular groove and the fifth annular groove, the various annular grooves on the valve sleeve of the device can be easily processed, and at the same time, the flow of hydraulic oil in the annular grooves of the device is smoother.

[0011] As a further improvement of the above solution, the oil holes include: a first oil hole, a second oil hole, a third oil hole, a fourth oil hole, and a fifth oil hole, and the oil holes are of the same size.

[0012] The technical effect of the above improvement is: through the setting of the first oil hole, the second oil hole, the third oil hole, the fourth oil hole and the fifth oil hole, the various oil holes on the valve sleeve of the device can be easily processed, and the flow of hydraulic oil in the oil holes of the device is smoother.

[0013] As a further improvement of the above scheme, an oil drain port connected to the first circular groove and the fifth circular groove is provided on one side of the outer wall of the valve body, an oil inlet connected to the third circular groove is provided on the other side of the outer wall of the valve body, and a rear connecting oil port connected to the second circular groove and a front connecting oil port connected to the fourth circular groove are provided at intervals on the upper end of the outer wall of the valve body.

[0014] The technical effect of the above improvement is: through the setting of the oil inlet, oil outlet, rear connecting oil port and front connecting oil port, the control valve of the device can be further conveniently connected to the oil pump, and it also facilitates the coordination of the oil circuit of the control valve with the digital cylinder.

[0015] As a further improvement of the above solution, the oil tank includes: a first oil tank, a second oil tank, a third oil tank, and a fourth oil tank.

[0016] The technical effect of the above improvement is: through the setting of the first oil groove, the second oil groove, the third oil groove and the fourth oil groove, the oil groove on the valve core of the device can further facilitate the oil hole on the valve sleeve to switch the oil circuit during the rotation process, thereby further improving the control accuracy of the device.

[0017] As a further improvement of the above solution, the output end of the motor is connected to the valve core through a cross coupling, and the end of the valve sleeve away from the motor is connected to the screw rod through a cross coupling.

[0018] The technical effect of the above improvement is: through the setting of the cross coupling, the valve core and the valve sleeve of the device can have a certain radial movement without affecting the control operation process of the device, reducing the difficulty of processing parts, making assembly and maintenance work simpler, and reducing manufacturing costs.

[0019] As a further improvement of the above solution, a limit spring is arranged between the inner part of the valve core on one side close to the motor and the end surface of the output end of the motor.

[0020] The technical effect of the above improvement is: through the setting of the limit spring, the device can limit the axial movement of the valve core and the valve sleeve, while allowing the valve core and the valve sleeve to rotate relatively flexibly, further improving the control progress of the device.

[0021] As a further improvement of the above scheme, a bearing seat is provided at one end of the rear cylinder cover, one end of the screw rod extends out of the rear cylinder cover and passes through the bearing seat, bearings adapted to the side walls of the screw rod are arranged at intervals inside the bearing seat, and a locking nut is provided on the side wall of the screw rod passing through the bearing seat.

[0022] The technical effect of the above improvement is: through the setting of the bearing seat, bearing and locking nut, the operation of the screw rod and the piston rod of the device in the hydraulic cylinder is limited, which ensures the reliability of the rotation of the screw rod in the digital cylinder and makes the operation of the digital cylinder smoother.

[0023] As a further improvement of the above solution, a connector adapted to the front end cover is provided at one end of the cylinder body close to the valve body, and a rotary encoder adapted to the screw rod is provided in the connector.

[0024] The technical effect of the above improvement is: through the setting of the connecting head and the rotary encoder, the connection between the digital cylinder of the device and the control valve is more firm and stable, and the rotation position of the screw rod and the valve sleeve can be detected in real time, which facilitates the control valve to control the oil circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0026] Figure 2 It is a schematic diagram of the three-dimensional cross-sectional structure of the present invention.

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the control valve part of the present invention.

[0028] Figure 4 It is a front view cross-sectional structural schematic diagram of the digital oil cylinder of the present invention.

[0029] Figure 5 It is a schematic diagram of the three-dimensional cross-sectional structure of the connection between the digital oil cylinder and the control valve of the present invention.

[0030] Figure 6 It is a schematic diagram of the three-dimensional structure of the valve body of the present invention.

[0031] Figure 7 It is a schematic diagram of the three-dimensional structure of the valve sleeve of the present invention.

[0032] Figure 8 It is a schematic diagram of the three-dimensional structure of the valve core of the present invention.

[0033] Fig. 9 This is a schematic cross-sectional structural diagram of the valve body portion when the piston rod is driven to advance according to the present invention.

[0034] Fig.10 This is a schematic cross-sectional structural diagram of the valve body portion when the driving piston rod is retracted according to the present invention.

[0035] Fig.11 It is a schematic diagram of the cross-sectional structure of the valve body when the piston rod is in a stopped state according to the present invention.

[0036] In the figure: 1, motor; 2, rear end cover; 3, control valve; 30, valve body; 31, oil inlet; 32, oil outlet; 33, rear connecting oil port; 34, front connecting oil port; 4, valve sleeve; 41, first oil hole; 42, second oil hole; 43, third oil hole; 44, fourth oil hole; 45, fifth oil hole; 411, first annular groove; 421, second annular groove; 431, third annular groove; 441, fourth annular groove; 451, fifth annular groove; 5, Valve core; 51, first oil groove; 52, second oil groove; 53, third oil groove; 54, fourth oil groove; 6, front end cover; 7, oil pipe; 8, limit spring; 9, digital cylinder; 901, piston rod; 902, cylinder body; 903, front cylinder cover; 904, piston; 905, rear cylinder cover; 906, bearing seat; 907, screw rod; 908, screw rod nut; 909, bearing; 910, locking nut; 911, rotary encoder; 912, connector. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solution, the technical solution is described in detail below in conjunction with the embodiments. The description in this section is only exemplary and explanatory and should not have any limiting effect on the scope of protection of this patent.

[0038] Embodiment 1:

[0039] like Figure 1-2As shown, the specific structure of this embodiment is: a hydraulic thruster, including a digital oil cylinder 9, a control valve 3 is arranged at one end of the digital oil cylinder 9, the digital oil cylinder 9 and the control valve 3 are connected through an oil pipe 7, the control valve 3 includes a valve body 30, one end of the valve body 30 is provided with a rear end cover 2, and the other end is provided with a front end cover 6, a valve sleeve 4 is rotatably installed in the valve body 30, a valve core 5 is rotatably installed in the valve sleeve 4, the valve body 30 is connected to the motor 1 through the rear end cover 2, the valve body 30 is connected to the digital oil cylinder 9 through the front end cover 6, the output end of the motor 1 extends into the valve body 30 and is connected to the valve core 5, annular grooves are arranged on the side wall of the valve sleeve 4 in sequence, an oil hole is penetrated at the same position in each annular groove, an oil port corresponding to each annular groove is arranged on the side wall of the valve body 30, and a valve core 5 is rotatably installed on the side wall of the valve sleeve 4. Oil grooves adapted to the oil holes are arranged on the wall in sequence, and the oil grooves are arranged obliquely. Sealing rings adapted to the inner wall of the valve body 30 are arranged at intervals on the side wall of the valve sleeve 4, and sealing rings adapted to the inner wall of the valve sleeve 4 are arranged at intervals on the side wall of the valve core 5. The digital cylinder 9 includes a cylinder body 902, a front cylinder cover 903 is arranged at one end of the cylinder body 902, a rear cylinder cover 905 is arranged at the end of the cylinder body 902 away from the front cylinder cover 903, a piston rod 901 is movably installed in the cylinder body 902, a screw rod 907 is arranged in the piston rod 901, a piston 904 adapted to the inner wall of the cylinder body 902 is arranged at the end of the piston rod 901 close to the control valve 3, a screw nut 908 adapted to the screw rod 907 is arranged in the piston 904, and the end of the valve sleeve 4 away from the motor 1 is connected to the screw rod 907. The annular grooves include: a first annular groove 411, a second annular groove 421, a third annular groove 431, a fourth annular groove 441, and a fifth annular groove 451, and the annular grooves are parallel to each other and have the same size. The oil holes include: a first oil hole 41, a second oil hole 42, a third oil hole 43, a fourth oil hole 44, and a fifth oil hole 45, and the oil holes have the same size. An oil discharge port 32 communicating with the first annular groove 411 and the fifth annular groove 451 is provided on one side of the outer wall of the valve body 30, and an oil inlet 31 communicating with the third annular groove 431 is provided on the other side of the outer wall of the valve body 30. The upper end of the outer wall of the valve body 30 is provided with a rear connecting oil port 33 communicating with the second annular groove 421 and a front connecting oil port 34 communicating with the fourth annular groove 441. The oil grooves include: a first oil groove 51, a second oil groove 52, a third oil groove 53, and a fourth oil groove 54.

[0040] Specific working principle: When using this device, first connect the valve body 30 of the control valve 3 of this device and the oil pump, that is, connect the oil inlet 31 and the oil outlet 32 ​​to the oil pump, and the hydraulic oil of the oil pump enters from the oil inlet 31 and is withdrawn from the oil outlet 32. Connect the rear connecting oil port 33 and the front connecting oil port 34 to the digital cylinder 9 respectively, and the inlet and outlet oil of the rear connecting oil port 33 and the front connecting oil port 34 will control the piston rod 901 of the digital cylinder 9 to extend or retract, and power on the motor 1. At this time, the oil circuits of the control valve 3 of the present device are as follows: the oil inlet 31 is connected to the third annular groove 431 and the third oil hole 43 in the third annular groove 431; the oil outlet 32 ​​is connected to the first annular groove 411, the fifth annular groove 451 and the first oil hole 41 in the first annular groove 411 and the fifth oil hole 45 in the fifth annular groove 451; the rear connecting oil port 33 is connected to the second annular groove 421 and the second oil hole 42 in the second annular groove 421; the front connecting oil port 34 is connected to the fourth annular groove 441 and the fourth oil hole 44 in the fourth annular groove 441. After the above process is completed, the valve sleeve 4 in the valve body 30 is connected to the screw rod 907 in the digital cylinder 9, and the screw rod 907 is connected to the piston 904 through the screw nut 908, that is, the forward and backward movement of the piston 904 will drive the screw rod 907 to rotate, and at the same time, the forward and backward movement of the piston 904 will drive the piston rod 901 connected thereto to extend or retract, and the output end of the motor 1 controls the rotation of the valve core 5 in the valve sleeve 4.

[0041] When it is necessary to drive the piston rod 901 of the device to advance, the valve core 5 in the control valve 3 is controlled by the motor 1 to rotate until the second oil groove 52 on the valve core 5 is connected to the first oil hole 41 and the second oil hole 42, the third oil groove 53 is connected to the third oil hole 43 and the fourth oil hole 44, the first oil groove 51 is not connected to any oil hole and the fourth oil groove 54 is connected to the fifth oil hole 45; the control oil circuit is switched as follows: the oil inlet 31 takes in oil and the oil is discharged from the front connecting oil port 34 to enter the digital cylinder 9, driving the piston rod 901 to advance; the rear connecting oil port 33 returns oil, that is, the oil in the digital cylinder 9 is squeezed out with the movement of the piston rod 901, and is pumped back to the oil pump from the oil discharge port 32, forming an oil circuit for the control valve 3 to positively control the digital cylinder 9 to advance.

[0042] When it is necessary to drive the piston rod 901 of the device to retract, the valve core 5 in the control valve 3 is controlled by the motor 1 to rotate until the second oil groove 52 on the valve core 5 is connected to the second oil hole 42 and the third oil hole 43, the third oil groove 53 is connected to the fourth oil hole 44 and the fifth oil hole 45, the fourth oil groove 54 is not connected to any oil hole and the first oil groove 51 is connected to the first oil hole 41; the control oil circuit is switched as follows: oil enters the oil inlet 31 and exits from the rear connecting oil port 33 to enter the digital cylinder 9, driving the piston rod 901 to retract; oil returns from the front connecting oil port 34 and is pumped back to the oil pump from the oil discharge port 32, completing the oil circuit of the control valve 3 to reversely control the retraction of the digital cylinder 9.

[0043] When the piston rod 901 of the digital oil cylinder 9 of the device needs to stop, the valve core 5 in the control valve 3 is controlled by the motor 1 to rotate until the first oil groove 51 on the valve core 5 is connected to the first oil hole 41, the second oil groove 52 is connected to the second oil hole 42, the third oil groove 53 is connected to the fourth oil hole 44, the fourth oil groove 54 is connected to the fifth oil hole 45, and the third oil hole 43 on the valve sleeve 4 is blocked by the part between the second oil groove 52 and the third oil groove 53, that is, the third oil hole 43 is not connected to any oil groove; the control oil circuit is switched as follows: the oil inlet 31 is closed because the third oil hole 43 is blocked and cannot take in oil, so the oil outlet 32, the rear connecting oil port 33, and the front connecting oil port 34 are all closed, the oil circuit is cut off, and the digital oil cylinder 9 cannot take in or out oil, completing the oil circuit for the control valve 3 to control the digital oil cylinder 9 to stop moving.

[0044] In summary, the oil groove of the valve core 5 of the control valve adopts an inclined design, so that the movable connection between the valve core 5 and the valve sleeve 4 can be sealed and separated by a sealing ring, reducing the subsequent maintenance cost; by controlling the rotation of the oil groove of the valve core 5 to match the oil hole on the valve sleeve 4, the oil circuit of the device can be freely switched to accurately and flexibly control the digital cylinder 9; the problem that the valve core 5 needs to rotate and move in a straight line to switch the oil circuit is solved, one set of screw rods is eliminated, and the accuracy problem caused by the tolerance of the screw rod itself is reduced, while making the assembly and maintenance work simpler and improving the control accuracy.

[0045] Embodiment 2:

[0046] like Figure 3-5 As shown, as a preferred embodiment of Example 1, the output end of the motor 1 is connected to the valve core 5 through a cross coupling, and the end of the valve sleeve 4 away from the motor 1 is connected to the screw rod 907 through a cross coupling. By setting the cross coupling, the valve core 5 and the valve sleeve 4 of the device can have a certain radial movement without affecting the operation process of the device, reducing the difficulty of processing parts, making assembly and maintenance work simpler, and reducing manufacturing costs.

[0047] Embodiment 3:

[0048] like Figure 3 As shown, as a preferred embodiment of Example 1, a limit spring 8 is provided between the inner side of the valve core 5 close to the motor 1 and the end surface of the output end of the motor 1. By providing the limit spring 8, the device can limit the axial movement of the valve core 5 and the valve sleeve 4, and at the same time allow the valve core 5 and the valve sleeve 4 to rotate relatively flexibly, further improving the control progress of the device.

[0049] Embodiment 4:

[0050] like Figure 4 , Figure 5As shown, as a preferred embodiment of Example 1, a bearing seat 906 is provided at one end of the rear cylinder cover 905, one end of the screw rod 907 extends out of the rear cylinder cover 905 and passes through the bearing seat 906, a bearing 909 adapted to the side wall of the screw rod 907 is arranged at intervals in the bearing seat 906, and a locking nut 910 is arranged on the side wall of the screw rod 907 passing through the bearing seat 906. Through the arrangement of the bearing seat 906, the bearing 909, and the locking nut 910, the operation of the screw rod 907 and the piston rod 901 of the device in the hydraulic cylinder is limited, which ensures the reliability of the screw rod 907 rotating in the digital oil cylinder 9, and makes the operation of the digital oil cylinder 9 more stable.

[0051] Embodiment 5:

[0052] like Figure 4 , Figure 5 As shown, as a preferred mode of the above embodiment, a connector 912 adapted to the front end cover 6 is provided at one end of the cylinder body 902 close to the control valve 3, and a rotary encoder 911 adapted to the screw rod 907 is provided in the connector 912. Through the arrangement of the connector 912 and the rotary encoder 911, the connection between the digital oil cylinder 9 of the device and the control valve 3 is made more firm and stable, and the rotation position of the screw rod 907 and the valve sleeve 4 can be detected in real time, so that the control valve 3 is convenient for oil circuit control.

[0053] It should be noted that, in this article, the terms "include", "comprises" 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. This article uses specific examples to illustrate the principles and implementation methods of the technical solution of this patent. The above examples are only used to help understand the method of this patent and its core ideas. The above is only a preferred implementation method of this patent. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this patent, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the patent's concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this patent.

Claims

1. A hydraulic thruster, comprising a digital oil cylinder (9), wherein one end of the digital oil cylinder (9) is provided with a control valve (3), the digital oil cylinder (9) and the control valve (3) are connected via an oil pipe (7), one end of the control valve (3) is provided with a rear end cover (2), and the other end of the control valve (3) is provided with a front end cover (6), characterized in that: The control valve (3) comprises a valve body (30), a valve sleeve (4) is rotatably mounted in the valve body (30), a valve core (5) is rotatably mounted in the valve sleeve (4), the valve body (30) is connected to the motor (1) via the rear end cover (2), the valve body (30) is connected to the digital oil cylinder (9) via the front end cover (6), the output end of the motor (1) extends into the valve body (30) and is connected to the valve core (5), annular grooves are sequentially arranged on the side wall of the valve sleeve (4), an oil hole is penetrated at the same position in each annular groove, an oil port corresponding to each annular groove is arranged on the side wall of the valve body (30), oil grooves adapted to each oil hole are sequentially arranged on the side wall of the valve core (5), each oil groove is arranged obliquely, the corresponding relationship between the oil hole and the oil groove is adjusted by the rotation of the valve core (5) to control the working state of the digital oil cylinder (9), and the side of the valve sleeve (4) is arranged at an angle to the oil hole. Sealing rings adapted to the inner wall of the valve body (30) are arranged at intervals on the wall, sealing rings adapted to the inner wall of the valve sleeve (4) are arranged at intervals on the side wall of the valve core (5), the digital oil cylinder (9) comprises a cylinder body (902), a front cylinder cover (903) is arranged at one end of the cylinder body (902), a rear cylinder cover (905) is arranged at the end of the cylinder body (902) away from the front cylinder cover (903), a piston rod (901) adapted to the inner wall of the cylinder body (902) is movably installed in the cylinder body (902), a screw rod (907) is arranged in the piston rod (901), a piston (904) is arranged at the end of the piston rod (901) close to the control valve (3), a screw nut (908) adapted to the screw rod (907) is arranged in the piston (904), and the end of the valve sleeve (4) away from the motor (1) is connected to the screw rod (907).

2. The hydraulic thruster according to claim 1, characterized in that: The annular grooves include: a first annular groove (411), a second annular groove (421), a third annular groove (431), a fourth annular groove (441), and a fifth annular groove (451), and the annular grooves are parallel to each other and have the same size.

3. The hydraulic thruster according to claim 2, characterized in that: The oil holes include: a first oil hole (41), a second oil hole (42), a third oil hole (43), a fourth oil hole (44), and a fifth oil hole (45), and the oil holes are of the same size.

4. The hydraulic thruster according to claim 3, characterized in that: An oil discharge port (32) communicating with the first annular groove (411) and the fifth annular groove (451) is provided on one side of the outer wall of the valve body (30), an oil inlet (31) communicating with the third annular groove (431) is provided on the other side of the outer wall of the valve body (30), and a rear connecting oil port (33) communicating with the second annular groove (421) and a front connecting oil port (34) communicating with the fourth annular groove (441) are provided at intervals at the upper end of the outer wall of the valve body (30).

5. The hydraulic thruster according to claim 4, characterized in that: The oil grooves include: a first oil groove (51), a second oil groove (52), a third oil groove (53), and a fourth oil groove (54).

6. The hydraulic thruster according to claim 5, characterized in that: The output end of the motor (1) is connected to the valve core (5) through a cross coupling, and the end of the valve sleeve (4) away from the motor (1) is connected to the screw rod (907) through the cross coupling.

7. The hydraulic thruster according to claim 6, characterized in that: A limit spring (8) is arranged between the interior of the valve core (5) on a side close to the motor (1) and the end surface of the output end of the motor (1).

8. The hydraulic thruster according to claim 1, characterized in that: A bearing seat (906) is disposed at one end of the rear cylinder cover (905); one end of the screw rod (907) extends out of the rear cylinder cover (905) and passes through the bearing seat (906); a bearing (909) adapted to the side wall of the screw rod (907) is disposed at intervals inside the bearing seat (906); and a locking nut (910) is disposed on the side wall of the screw rod (907) that passes through the bearing seat (906).

9. The hydraulic thruster according to claim 8, characterized in that: A connector (912) adapted to the front end cover (6) is provided at one end of the cylinder body (902) close to the control valve (3), and a rotary encoder (911) adapted to the lead screw (907) is provided in the connector (912).

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