Valve-controlled digital hydraulic cylinder

Abstract

This invention discloses a valve-controlled integrated digital hydraulic cylinder, comprising: a cylinder body, a piston rod, a stroke sensor, a controller, and a solenoid valve. The cylinder body includes a main cylinder and a secondary cylinder, and has a first oil passage and a second oil passage. The piston rod is movably disposed within the main cylinder along its axial direction, defining a rod-side chamber and a rodless chamber within the main cylinder. The first oil passage communicates with the rod-side chamber, and the second oil passage communicates with the rodless chamber. The stroke sensor and controller are both located within the secondary cylinder, and the solenoid valve is connected to the secondary cylinder. The controller is also connected to both the stroke sensor and the solenoid valve. By placing the stroke sensor, controller, and solenoid valve on the secondary cylinder, the integration of the hydraulic cylinder is improved. Furthermore, due to the high integration of the hydraulic cylinder, the length of the pipeline between the hydraulic cylinder and the solenoid valve is reduced, enabling the control components to quickly and accurately control the position of the piston rod. This also avoids the problem of delayed start-up and stop caused by excessive distance between the hydraulic cylinder and the valve components.

Description

Technical Field

[0001] This invention relates to the field of mechanical equipment technology, and in particular to a valve-controlled integrated digital hydraulic cylinder. Background Technology

[0002] Hydraulic cylinders, also known as oil cylinders, are actuators in power transmission processes and are widely used in the hydraulic systems of various machines. In practical applications, the control system of an oil cylinder typically consists of a displacement sensor, a controller, and a solenoid valve. The displacement sensor is mounted on the oil cylinder to monitor the displacement of the piston. However, the controller and solenoid valve are set independently of the oil cylinder body, resulting in low integration between the oil cylinder and the control system. This makes troubleshooting and maintenance difficult and time-consuming, thus affecting the production speed of the machinery. Furthermore, when the oil cylinder is too far from the valve assembly, there is a significant delay in the start and stop of the oil cylinder. In addition, when the oil cylinder and solenoid valve are separate, the connection between them requires a long hydraulic pipeline. If the machinery has multiple oil cylinders and multiple hydraulic pipelines, additional consolidation components are needed to prevent site clutter, leading to construction difficulties and high costs. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention propose a highly integrated valve-controlled digital hydraulic cylinder, which can quickly and accurately control the position of the piston.

[0005] The valve-controlled integrated digital hydraulic cylinder of this invention includes: a cylinder body, a piston rod, a stroke sensor, a controller, and a solenoid valve. The cylinder body includes a main cylinder and a secondary cylinder connected together. The cylinder body has a first oil passage and a second oil passage. The piston rod is movably disposed within the main cylinder along the axial direction of the main cylinder, defining a rod chamber and a rodless chamber within the main cylinder. The first oil passage communicates with the rod chamber, and the second oil passage communicates with the rodless chamber. The stroke sensor is disposed within the secondary cylinder and blocks the secondary cylinder. The stroke sensor is used to monitor the displacement of the piston rod. The controller is disposed within the secondary cylinder, and the stroke sensor is connected to the controller to transmit the electrical signal generated by the monitoring to the controller. The solenoid valve is connected to the secondary cylinder, and the controller is connected to the solenoid valve to control the opening and closing of the solenoid valve.

[0006] In this embodiment of the invention, the valve-controlled integrated digital hydraulic cylinder uses a stroke sensor, controller, and solenoid valve as control components. By placing the control components on a secondary cylinder, the integration of the hydraulic cylinder and control components is improved. Furthermore, the shorter distance between the hydraulic cylinder and the control components reduces the length of the piping between them, thereby enabling the control components to quickly and accurately control the piston rod position. This also avoids the problem of delayed cylinder start-up and stopping caused by excessively large distances between the hydraulic cylinder and the valve group.

[0007] In some embodiments, a seal is also included, wherein the stroke sensor is located at one end of the auxiliary cylinder near the master cylinder, the seal is disposed around the outer peripheral wall of the stroke sensor, and the seal is used to prevent oil in the master cylinder from flowing to the side of the stroke sensor away from the master cylinder, and the controller and the solenoid valve are both located on the side of the stroke sensor away from the master cylinder.

[0008] In some embodiments, the seal is an elastic sealing ring, and an annular groove is provided on the outer peripheral wall of the stroke sensor. At least a portion of the elastic sealing ring is engaged in the annular groove, and the outer peripheral wall of the elastic sealing ring abuts against the inner peripheral wall of the auxiliary cylinder.

[0009] In some embodiments, the stroke sensor is a pull-rope displacement sensor, and the moving end of the pull-rope of the pull-rope displacement sensor is connected to the end of the piston rod near the pull-rope displacement sensor.

[0010] In some embodiments, a connecting ring is further included, which is rotatably disposed on the end face of the piston rod near the pull rope displacement sensor around its own central axis. The inner peripheral wall of the connecting ring is provided with an internal thread, and the moving end of the pull rope of the pull rope displacement sensor has a cylindrical connector. The outer peripheral wall of the cylindrical connector is provided with an external thread that matches the internal thread, and the cylindrical connector is threadedly connected to the connecting ring.

[0011] In some embodiments, the valve body of the solenoid valve is connected to the end of the auxiliary cylinder that is away from the main cylinder, and the pilot valve of the solenoid valve is located inside the auxiliary cylinder.

[0012] In some embodiments, the auxiliary cylinder has a wire channel comprising a first wire segment and a second wire segment that communicate with each other. The first wire segment extends radially along the auxiliary cylinder and communicates with a chamber of the auxiliary cylinder, while the second wire segment extends axially along the auxiliary cylinder and communicates with the outside.

[0013] In some embodiments, the first oil passage is provided on the main cylinder and extends radially along the main cylinder. The valve-controlled integrated digital cylinder further includes an extension tube, which is provided on the outer peripheral wall of the main cylinder. One end of the extension tube communicates with the first oil passage, and the other end of the extension tube is adjacent to the end of the main cylinder near the auxiliary cylinder.

[0014] In some embodiments, the second oil passage is provided on the auxiliary cylinder. The second oil passage includes a first section, a second section, and a third section. The first section extends axially along the auxiliary cylinder and communicates with the rodless cavity. The third section extends axially along the auxiliary cylinder and communicates with the outside. The second section extends radially along the auxiliary cylinder, and both ends of the second section communicate with the first section and the third section, respectively.

[0015] In some embodiments, the outer peripheral wall of the auxiliary cylinder has multiple support columns, which are distributed at intervals along the circumference of the auxiliary cylinder and arranged radially along the auxiliary cylinder. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a valve-controlled integrated digital hydraulic cylinder according to an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the internal structure of the valve-controlled integrated digital hydraulic cylinder according to an embodiment of the present invention.

[0018] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle.

[0019] Figure 4 yes Figure 2 Enlarged diagram of part B.

[0020] Figure 5 This is a schematic diagram of the wiring channel of the valve-controlled integrated digital hydraulic cylinder according to an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the first oil passage of the valve-controlled integrated digital hydraulic cylinder according to an embodiment of the present invention.

[0022] Figure 7 This is a schematic diagram of the second oil passage of the valve-controlled integrated digital hydraulic cylinder according to an embodiment of the present invention.

[0023] Figure label:

[0024] Cylinder block 1, main cylinder 11, rod chamber 111, rodless chamber 112, auxiliary cylinder 12, first oil passage 13, second oil passage 14, wire channel 15.

[0025] Piston rod 2, connecting ring 21

[0026] 3. Stroke sensor; 31. Cable displacement sensor; 32. Columnar connector.

[0027] Controller 4, solenoid valve 5, extension tube 6, support column 7. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] The valve-controlled integrated digital hydraulic cylinder of the present invention will now be described in conjunction with the accompanying drawings.

[0030] like Figures 1 to 7 As shown, the valve-controlled integrated digital hydraulic cylinder of this embodiment includes: a cylinder body 1, a piston rod 2, a stroke sensor 3, a controller 4, and a solenoid valve 5. The cylinder body 1 includes a main cylinder 11 and a secondary cylinder 12 connected together, and has a first oil passage 13 and a second oil passage 14. The piston rod 2 is movably disposed within the main cylinder 11 along its axial direction, defining a rod chamber 111 and a rodless chamber 112 within the main cylinder 11. The first oil passage 13 communicates with the rod chamber 111, and the second oil passage 14 communicates with the rodless chamber 112. The stroke sensor 3 is disposed within the secondary cylinder 12 and blocks the secondary cylinder 12; the stroke sensor 3 is used to monitor the displacement of the piston rod 2. The controller 4 is disposed within the secondary cylinder 12, and the stroke sensor 3 is connected to the controller 4 to transmit the electrical signal generated by the monitoring to the controller 4. The solenoid valve 5 is connected to the secondary cylinder 12, and the controller 4 is connected to the solenoid valve 5 to control the opening and closing of the solenoid valve 5.

[0031] Optionally, such as Figure 1 As shown, the cylinder body 1 includes a main cylinder 11 and an auxiliary cylinder 12, both of which are cylindrical. Both the main cylinder 11 and the auxiliary cylinder 12 are arranged in a left-right direction, and the central axis of the main cylinder 11 and the central axis of the auxiliary cylinder 12 are coaxial. The right end of the main cylinder 11 and the left end of the auxiliary cylinder 12 are connected, allowing their internal spaces to communicate with each other. The left end of the main cylinder 11 has a cylinder head with a sliding hole. The piston rod 2 is arranged in a left-right direction, passing through the sliding hole, and its right end is movably disposed within the main cylinder 11 in the left-right direction. Furthermore, a sealing ring is provided within the sliding hole to prevent oil in the main cylinder 11 from flowing out through the sliding hole during the sliding of the piston rod 2.

[0032] Furthermore, such as Figure 2As shown, a piston cylinder is fitted onto the right end of the piston rod 2, and the outer peripheral wall of the piston cylinder is in sealed sliding contact with the inner peripheral wall of the main cylinder 11. The piston cylinder defines a rod chamber 111 and a rodless chamber 112 within the main cylinder 11. The rod chamber 111 is located on the left side of the piston cylinder, and the rodless chamber 112 is located on the right side of the piston cylinder. The first oil passage 13 is connected to the rod chamber 111, and the second oil passage 14 is connected to the rodless chamber 112. For example, when oil is flowing through the first oil passage 13, the oil pushes the piston cylinder and causes the piston rod 2 to move to the right. When oil is flowing through the second oil passage 14, the oil pushes the piston cylinder and causes the piston rod 2 to move to the left. The oil flowing into the main cylinder 11 is an emulsion.

[0033] Optionally, such as Figure 2 and Figure 3 As shown, stroke sensor 3 is mounted inside auxiliary cylinder 12. Stroke sensor 3 is either a wire-type mechanical sensor or a non-contact magnetic ring sensor. Examples include magnetostrictive displacement sensors and wire-type displacement sensors 31. Stroke sensor 3 monitors the displacement of piston rod 2 and also seals auxiliary cylinder 12 to prevent oil from flowing out of main cylinder 11 through auxiliary cylinder 12. Controller 4 is located inside auxiliary cylinder 12, to the right of stroke sensor 3, thus achieving physical isolation between the oil and controller 4. Stroke sensor 3 and controller 4 are connected by wires, and stroke sensor 3 transmits the electrical signal generated during monitoring to controller 4. Solenoid valve 5 is bolted to the right end face of auxiliary cylinder 12, and controller 4 is connected to solenoid valve 5 to control its opening and closing, thereby controlling the position of piston rod 2.

[0034] Therefore, in this embodiment of the invention, the valve-controlled integrated digital hydraulic cylinder uses the stroke sensor 3, controller 4, and solenoid valve 5 as control components. By placing the control components on the auxiliary cylinder 12, the integration of the hydraulic cylinder and the control components is improved. Furthermore, the shorter distance between the hydraulic cylinder and the control components reduces the length of the pipeline between them, thereby enabling the control components to quickly and accurately control the position of the piston rod 2. This also avoids the problem of delayed start-up and stop caused by excessively large distances between the hydraulic cylinder and the valve group.

[0035] Furthermore, the valve-controlled integrated digital hydraulic cylinder of this invention is suitable for applications requiring precise position control of the hydraulic cylinder, especially when using a single hydraulic cylinder and needing to ensure uninterrupted production or where the cylinder's response speed is sensitive. For example, hydraulic cylinders on the roadway support plates during mine roadway support work. Or, hydraulic cylinders on cutting equipment during cutting operations.

[0036] In some embodiments, a seal is also included. The stroke sensor 3 is located at one end of the auxiliary cylinder 12 near the main cylinder 11. The seal is disposed around the outer peripheral wall of the stroke sensor 3. The seal is used to prevent oil in the main cylinder 11 from flowing to the side of the stroke sensor 3 away from the main cylinder 11. The controller 4 and the solenoid valve 5 are both located on the side of the stroke sensor 3 away from the main cylinder 11.

[0037] Optionally, such as Figure 2 and Figure 3 As shown, the stroke sensor 3 is located at the left end of the auxiliary cylinder 12. A seal is arranged around the outer peripheral wall of the stroke sensor 3 to prevent oil in the main cylinder 11 from flowing to the right side of the stroke sensor 3. The controller 4 and the solenoid valve 5 are both located to the right of the stroke sensor 3, thus preventing oil from affecting the operation of the controller 4 and the solenoid valve 5. Furthermore, the seal not only seals the oil but also secures the stroke sensor 3 within the auxiliary cylinder 12.

[0038] Specifically, the sealing element is an elastic sealing ring. The outer peripheral wall of the stroke sensor 3 is provided with an annular groove, at least part of the elastic sealing ring is engaged in the annular groove, and the outer peripheral wall of the elastic sealing ring abuts against the inner peripheral wall of the auxiliary cylinder 12.

[0039] In some embodiments, such as Figures 2 to 4 As shown, the stroke sensor 3 is a pull rope displacement sensor 31, and the moving end of the pull rope of the pull rope displacement sensor 31 is connected to the end of the piston rod 2 that is close to the pull rope displacement sensor 31.

[0040] Understandably, the cable displacement sensor 31 remains stationary, and the cable of the sensor is connected to the moving object (piston rod 2). Furthermore, the linear motion of the cable and the axis of motion of the moving object are aligned. During motion, the cable extends and contracts. An internal spring ensures that the tension of the cable remains constant. A threaded hub drives a precision rotary sensor to rotate, outputting an electrical signal proportional to the distance the cable has moved. Measuring the output signal allows determination of the displacement, direction, or speed of the moving object.

[0041] In some embodiments, such as Figures 2 to 4 As shown, it also includes a connecting ring 21, which is rotatably disposed on the end face of the piston rod 2 near the pull rope displacement sensor 31 around its own central axis. The inner peripheral wall of the connecting ring 21 is provided with an internal thread, and the moving end of the pull rope of the pull rope displacement sensor 31 has a cylindrical connector 32. The outer peripheral wall of the cylindrical connector 32 is provided with an external thread that matches the internal thread, and the cylindrical connector 32 is threadedly connected to the connecting ring 21.

[0042] Optionally, such as Figure 4As shown, the connecting ring 21 is rotatably mounted on the right end face of the piston rod 2, and the central axis of the connecting ring 21 is coaxial with the central axis of the piston rod 2. The inner peripheral wall of the connecting ring 21 is provided with an internal thread (not shown in the figure), and the outer peripheral wall of the cylindrical connector 32 is provided with an external thread (not shown in the figure). The left end of the cylindrical connector 32 is threadedly connected to the connecting ring 21.

[0043] Therefore, when installing the cylindrical connector 32, the connecting ring 21 is first fixed. After the cylindrical connector 32 is screwed into the connecting ring 21, the pull rope rotates together with the cylindrical connector 32. After the cylindrical connector 32 and the connecting ring 21 are installed, the connecting ring 21 is rotated, which simultaneously drives the cylindrical connector 32 and the pull rope to rotate, so that the pull rope returns to its initial state. This avoids the monitoring error of the pull rope displacement sensor 31 caused by the twisting and deformation of the pull rope during the assembly process of the cylindrical connector 32.

[0044] In some embodiments, such as Figures 1 to 3 As shown, the valve body of the solenoid valve 5 is connected to the end of the auxiliary cylinder 12 that is away from the main cylinder 11, and the pilot valve of the solenoid valve 5 is located inside the auxiliary cylinder 12.

[0045] Specifically, such as Figures 1 to 3 As shown, the valve body of the solenoid valve 5 is connected to the right end face of the auxiliary cylinder 12 by bolt connection, and the valve body of the solenoid valve 5 seals the opening at the right end of the auxiliary cylinder 12, thereby preventing external factors (such as water, dust, coal slag, etc.) from affecting the components inside the auxiliary cylinder 12.

[0046] Furthermore, such as Figures 1 to 5 As shown, the auxiliary cylinder 12 has a wire channel 15. The wire channel 15 includes a first wire segment and a second wire segment that are connected. The first wire segment extends radially along the auxiliary cylinder 12 and communicates with the chamber of the auxiliary cylinder 12, while the second wire segment extends axially along the auxiliary cylinder 12 and communicates with the outside.

[0047] It is understandable that the cable displacement sensor 31, controller 4 and solenoid valve 5 all need to be powered. Therefore, a wire channel 15 is opened on the auxiliary cylinder 12 so that the wires used for connection can enter the auxiliary cylinder 12 through the wire channel 15, thereby meeting the power supply requirements of the components in the auxiliary cylinder 12.

[0048] Optionally, such as Figure 5 As shown, the outer peripheral wall of the auxiliary cylinder 12 has a wire protrusion. A first wire segment is formed on the wire protrusion, and a second wire segment is formed on both the wire protrusion and the auxiliary cylinder 12. The first wire segment extends in a left-right direction, with its left end located on the left end face of the wire protrusion and its right end located on the right end face of the wire protrusion. The second wire segment extends radially along the auxiliary cylinder 12. The end of the second wire segment away from the central axis of the auxiliary cylinder 12 communicates with the first wire segment, and the end of the second wire segment closer to the auxiliary cylinder 12 communicates with the chamber of the auxiliary cylinder 12.

[0049] In some embodiments, such as Figure 1 and Figure 6 As shown, the first oil passage 13 is provided on the main cylinder 11 and extends radially along the main cylinder 11. The valve-controlled integrated digital cylinder of this embodiment also includes an extension tube 6, which is provided on the outer peripheral wall of the main cylinder 11. One end of the extension tube 6 is connected to the first oil passage 13, and the other end of the extension tube 6 is adjacent to the end of the main cylinder 11 near the auxiliary cylinder 12.

[0050] Optionally, such as Figure 1 and Figure 6 As shown, the first oil passage 13 extends radially along the master cylinder 11 and is located at the left end of the master cylinder 11. The extension tube 6 is arranged in the left-right direction. The end of the first oil passage 13 near the central axis of the master cylinder 11 is connected to the rod chamber 111, and the end of the first oil passage 13 away from the central axis of the master cylinder 11 is connected to the left end of the extension tube 6. The right end of the extension tube 6 is closer to the right end of the master cylinder 11 than the left and right ends of the master cylinder 11.

[0051] For example, if the valve-controlled integrated digital hydraulic cylinder of this embodiment is used in a coal cutting device in underground mining, the hydraulic pipeline of the first oil passage 13 is connected to the tail of the cylinder body 1 by setting an extension pipe 6, thereby avoiding the hydraulic pipeline from being too close to the coal seam being cut, which would cause the cut coal block to affect the hydraulic pipeline.

[0052] In some embodiments, such as Figure 1 and Figure 7 As shown, the second oil passage 14 is provided on the auxiliary cylinder 12. The second oil passage 14 includes a first section, a second section and a third section. The first section extends along the axial direction of the auxiliary cylinder 12 and communicates with the rodless chamber 112. The third section extends along the axial direction of the auxiliary cylinder 12 and communicates with the outside. The second section extends along the radial direction of the auxiliary cylinder 12, and the two ends of the second section are respectively connected to the first section and the third section.

[0053] Optionally, such as Figure 1 and Figure 7As shown, the outer peripheral wall of the auxiliary cylinder 12 has an oil guide protrusion. The first section of the second oil passage 14 is formed on the auxiliary cylinder 12, the second section of the second oil passage 14 is formed on both the oil guide protrusion and the auxiliary cylinder 12, and the third section of the second oil passage 14 is formed on the oil guide protrusion. Both the first and third sections of the second oil passage 14 extend in a left-right direction, and the second section of the second oil passage 14 extends radially along the auxiliary cylinder 12. The left end of the first section of the second oil passage 14 communicates with the rodless cavity 112, the left end of the third section of the second oil passage 14 communicates with the outside, the end of the second section of the second oil passage 14 near the central axis of the auxiliary cylinder 12 communicates with the right end of the first section of the second oil passage 14, and the end of the second section of the second oil passage 14 away from the central axis of the auxiliary cylinder 12 communicates with the right end of the third section of the second oil passage 14.

[0054] In some embodiments, such as Figure 1 As shown, the outer peripheral wall of the auxiliary cylinder 12 has multiple support columns 7, which are distributed at intervals along the circumference of the auxiliary cylinder 12 and arranged radially along the auxiliary cylinder 12.

[0055] It is understood that, in practical applications, the valve-controlled integrated digital hydraulic cylinder of this embodiment is mounted on mechanical equipment via the cylinder support column 7. Optionally, as... Figure 1 As shown, there are two support columns 7, which are symmetrically arranged on the outer peripheral wall of the auxiliary cylinder 12 along the front-rear direction.

[0056] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0058] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0060] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A valve-controlled integrated digital hydraulic cylinder, characterized in that, include: The cylinder body includes a main cylinder and a secondary cylinder connected together. The cylinder body has a first oil passage and a second oil passage. The outer peripheral wall of the secondary cylinder has multiple support columns, which are distributed at intervals along the circumference of the secondary cylinder and arranged radially along the secondary cylinder. A piston rod is movably disposed within the main cylinder along the axial direction of the main cylinder. The piston rod defines a rod chamber and a rodless chamber within the main cylinder. A first oil passage is connected to the rod chamber, and a second oil passage is connected to the rodless chamber. A stroke sensor is disposed inside and sealed within the auxiliary cylinder, and the stroke sensor is used to monitor the displacement of the piston rod; A controller is located inside the auxiliary cylinder, and the stroke sensor is connected to the controller to transmit the electrical signal generated by the monitoring to the controller; A solenoid valve is connected to the auxiliary cylinder, and a controller is connected to the solenoid valve to control the opening and closing of the solenoid valve; A seal is provided, wherein the stroke sensor is located at the end of the auxiliary cylinder near the main cylinder, the seal is arranged around the outer peripheral wall of the stroke sensor, and the seal is used to prevent oil in the main cylinder from flowing to the side of the stroke sensor away from the main cylinder. The controller and the solenoid valve are both located on the side of the stroke sensor away from the main cylinder. The auxiliary cylinder has a wire channel, which includes a first wire segment and a second wire segment that are connected. The first wire segment extends radially along the auxiliary cylinder and communicates with the chamber of the auxiliary cylinder, while the second wire segment extends axially along the auxiliary cylinder and communicates with the outside. The first oil passage is provided on the main cylinder and extends radially along the main cylinder. The valve-controlled integrated digital cylinder also includes an extension tube, which is provided on the outer peripheral wall of the main cylinder. One end of the extension tube is connected to the first oil passage, and the other end of the extension tube is adjacent to the end of the main cylinder near the auxiliary cylinder. The second oil passage is provided on the auxiliary cylinder. The second oil passage includes a first section, a second section and a third section. The first section extends along the axial direction of the auxiliary cylinder and communicates with the rodless cavity. The third section extends along the axial direction of the auxiliary cylinder and communicates with the outside. The second section extends along the radial direction of the auxiliary cylinder, and the two ends of the second section are respectively connected to the first section and the third section.

2. The valve-controlled integrated digital hydraulic cylinder according to claim 1, characterized in that, The sealing element is an elastic sealing ring. The outer peripheral wall of the stroke sensor is provided with an annular groove. At least a portion of the elastic sealing ring is engaged in the annular groove. The outer peripheral wall of the elastic sealing ring abuts against the inner peripheral wall of the auxiliary cylinder.

3. The valve-controlled integrated digital hydraulic cylinder according to claim 1, characterized in that, The stroke sensor is a pull-rope displacement sensor, and the moving end of the pull-rope of the pull-rope displacement sensor is connected to the end of the piston rod closest to the pull-rope displacement sensor.

4. The valve-controlled integrated digital hydraulic cylinder according to claim 3, characterized in that, It also includes a connecting ring, which is rotatably disposed on the end face of the piston rod near the pull rope displacement sensor around its own central axis. The inner peripheral wall of the connecting ring is provided with an internal thread, and the moving end of the pull rope of the pull rope displacement sensor has a cylindrical connector. The outer peripheral wall of the cylindrical connector is provided with an external thread that matches the internal thread. The cylindrical connector is threadedly connected to the connecting ring.

5. The valve-controlled integrated digital hydraulic cylinder according to claim 1, characterized in that, The valve body of the solenoid valve is connected to the end of the auxiliary cylinder that is furthest from the main cylinder, and the pilot valve of the solenoid valve is located inside the auxiliary cylinder.

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