rotary cylinder

Abstract

The present disclosure provides a rotary oil cylinder, which belongs to the technical field of hydraulic drive. The rotary oil cylinder comprises a cylinder barrel, a piston and an output shaft, the cylinder barrel is internally provided with a pilot oil passage, a high-pressure oil inlet passage and an oil return passage which are spaced apart from each other; the piston is movably arranged in the cylinder barrel, a pilot oil cavity is in communication with the pilot oil passage, the pilot oil cavity and the high-pressure oil cavity are arranged in a spaced apart manner, the pilot oil cavity and the high-pressure oil cavity are used for driving the piston to switch from a first position to a second position, a first end of the output shaft is located in a second end of the piston, a second rotary screw pair opposite in rotation direction to the first rotary screw pair is formed between the output shaft and the piston, and a second end of the output shaft is located outside the cylinder barrel. The present disclosure can improve the output accuracy of the rotary oil cylinder.

Description

Technical Field

[0001] This disclosure belongs to the field of hydraulic drive technology, and specifically relates to a rotary cylinder. Background Technology

[0002] A rotary cylinder is a hydraulic actuator that converts the linear motion of a piston into the rotation of an output shaft. Rotary cylinders are widely used due to their advantages such as small size and large output torque.

[0003] In related technologies, a rotary cylinder includes a cylinder body, a piston, and an output shaft. The piston is located inside the cylinder body, and its outer wall and the inner wall of the cylinder body form a first rotary helical pair. The output shaft is inserted into the piston and is rotatably connected to the cylinder body. The outer wall of the output shaft and the inner wall of the piston form a second rotary helical pair with a direction opposite to that of the first rotary helical pair. Two spaced oil chambers are formed between the piston and the cylinder body on either side of the output shaft along its length. By inputting high-pressure oil into one of the two oil chambers, the piston can be driven to rotate while moving along the length of the output shaft, thereby causing the output shaft to rotate. In other words, the rotation of the output shaft is achieved through the relative motion of the two pairs of rotary helical pairs formed between the piston and the output shaft, and between the cylinder body and the piston.

[0004] The rotational speed of the output shaft in a rotary hydraulic cylinder is closely related to the pressure and flow rate of the high-pressure oil. To achieve a large output torque, both the pressure and flow rate of the high-pressure oil entering the oil chamber must be high. However, when the flow rate of the high-pressure oil increases, the pump unit may be unable to supply enough oil in time, leading to a drop in oil pressure within the oil chamber. This results in significant fluctuations in oil pressure within the chamber, causing unstable output torque and affecting output accuracy. Summary of the Invention

[0005] This disclosure provides a rotary hydraulic cylinder that can improve the output accuracy of the rotary hydraulic cylinder. The technical solution is as follows:

[0006] This disclosure provides a rotary hydraulic cylinder, which includes a cylinder barrel, a piston, and an output shaft. The cylinder barrel has mutually spaced pilot oil channels, a high-pressure oil inlet channel, and a return oil channel. The piston is movably located within the cylinder barrel. The outer wall of the piston and the inner wall of the cylinder barrel form a first rotary helical pair. The first end of the piston and the inner wall of the cylinder barrel form a pilot oil chamber, which communicates with the pilot oil channels. The middle portion of the piston and the inner wall of the cylinder barrel form a high-pressure oil inlet chamber. The pilot oil chamber and the high-pressure oil inlet chamber are arranged at intervals. The oil chamber and the high-pressure oil inlet chamber are used to drive the piston to switch from a first position to a second position. When the piston is in the first position, the high-pressure oil inlet chamber is connected to the high-pressure oil inlet channel and is not connected to the return oil channel. When the piston is in the second position, the high-pressure oil inlet chamber is connected to the return oil channel. The first end of the output shaft is located in the second end of the piston, and a second rotary helical pair opposite to the first rotary helical pair is formed between the output shaft and the piston. The second end of the output shaft is located outside the cylinder.

[0007] In another implementation of this disclosure, the rotary cylinder further includes a pilot oil control component, which is movably connected to the cylinder barrel such that the pilot oil inlet of the pilot oil control component is connected to or not connected to the pilot oil channel, and when the pilot oil inlet is not connected to the pilot oil channel, the pilot oil control component blocks the pilot oil channel.

[0008] In another implementation of this disclosure, the cylinder barrel further has an oil drain channel, which is arranged at an interval from the pilot oil channel, and when the pilot oil inlet is not connected to the pilot oil channel, the pilot oil inlet is connected to the oil drain channel.

[0009] In another implementation of this disclosure, the oil drain channel includes a connecting section and an oil drain section, the connecting section and the oil drain section being located on opposite sides of the piston axis, and the connecting section and the oil drain section being connected when the high-pressure oil inlet chamber is connected to the high-pressure oil inlet channel; the connecting section and the pilot oil channel are located on the same side of the piston at intervals, and the connecting section is connected to the pilot oil inlet when the pilot oil inlet is not connected to the pilot oil channel.

[0010] In another implementation of this disclosure, the pilot oil control component includes a nozzle, a rotating arm, and a drive component. The nozzle has a control oil passage, one end of which is connected to the pilot oil inlet, and the other end of which faces the inlet of the pilot oil channel or the inlet of the connecting section. The nozzle is slidably sealed to the side wall of the cylinder where the inlet of the pilot oil channel and the inlet of the connecting section are located. The rotating arm is connected to the nozzle and rotatably connected to the cylinder, and the rotation axis of the rotating arm is perpendicular to the axis of the inlet of the connecting section. The drive component is connected to the rotating arm and is used to drive the rotating arm to rotate.

[0011] In another implementation of this disclosure, the pilot oil channel includes a pilot oil inlet section and a pilot oil flow section that are interconnected. The end of the pilot oil inlet section away from the pilot oil flow section faces the control oil passage. The inner diameter of both the pilot oil inlet section and the control oil passage is smaller than the inner diameter of the pilot oil flow section.

[0012] In another implementation of this disclosure, the outer wall of the piston has an annular groove, the center of which is located on the central axis of the piston; when the high-pressure oil inlet chamber is connected to the high-pressure oil inlet channel, the annular groove is connected to the connecting section and the drain section respectively.

[0013] In another implementation of this disclosure, the outer wall of the piston has an annular connecting groove, the center of which is located on the central axis of the piston, and the high-pressure oil inlet chamber is formed between the connecting groove and the inner wall of the cylinder.

[0014] In another implementation of this disclosure, the rotary cylinder further includes an elastic reset member located inside the cylinder barrel and sleeved outside the output shaft, with both ends of the elastic reset member clamped between the second end of the piston and the cylinder barrel.

[0015] In another implementation of this disclosure, the cylinder includes a first end cap, a second end cap, and a cylinder body, wherein the first end cap and the second end cap are detachably connected to opposite ends of the cylinder body.

[0016] In another implementation of this disclosure, the valve body includes a first end cap, a second end cap, and a valve block, wherein the first end cap and the second end cap are detachably connected to opposite ends of the valve block along the length of the piston.

[0017] The beneficial effects of the technical solutions provided in this disclosure are:

[0018] When using the rotary cylinder provided in this embodiment, since a pilot oil chamber and a high-pressure oil inlet chamber are formed between the cylinder and the piston respectively, when it is necessary to drive the piston to move so that the output shaft outputs torque, pilot oil can be filled into the pilot oil chamber through the pilot oil channel, and high-pressure oil can be filled into the high-pressure oil inlet chamber through the high-pressure oil inlet channel, so that the piston gradually moves from the first position to the second position. During this process, the oil in the pilot oil chamber and the high-pressure oil inlet chamber can simultaneously drive the piston to move while rotating, thereby driving the output shaft to output torque. When the piston is in the second position, since the high-pressure oil inlet chamber is connected to the return oil channel, the oil pressure in the high-pressure oil inlet chamber becomes zero, and the piston is no longer driven by the high-pressure oil inlet chamber. At this time, the piston can be pulled back to reset by external force (such as manually) so that the output shaft can be driven to rotate again.

[0019] Since the pilot oil chamber and the high-pressure oil inlet chamber are two independent oil chambers, they do not affect each other. Therefore, during the process of driving the piston to switch from the first position to the second position, oil can be introduced into the pilot oil chamber at the same time as the high-pressure oil inlet chamber. In this way, without changing the oil in the high-pressure oil inlet chamber, the movement state of the piston can be adjusted by adjusting the state of the oil in the pilot oil chamber, so that the output torque of the output shaft is constant, thereby improving the output accuracy of the output shaft.

[0020] In other words, in this embodiment of the present disclosure, the piston can be driven simultaneously by two independent pilot oil chambers and a high-pressure oil inlet chamber. While driving the piston, the state of the oil in the pilot oil chamber is adjusted to improve the stability of the flow rate and pressure of the oil driving the piston, thereby ensuring that the output torque of the output shaft meets the accuracy requirements. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a rotary hydraulic cylinder provided in an embodiment of the present disclosure;

[0023] Figure 2 This is a schematic diagram of the structure of the pilot oil control component provided in an embodiment of the present disclosure;

[0024] Figure 3 This is a schematic diagram of the cylinder structure provided in an embodiment of the present disclosure;

[0025] Figure 4This is a schematic diagram of the valve body provided in an embodiment of the present disclosure;

[0026] Figure 5 This is a schematic diagram of the structure of the pressure plate provided in an embodiment of the present disclosure;

[0027] Figure 6 This is a schematic diagram of the piston structure provided in an embodiment of the present disclosure;

[0028] Figure 7 This is a schematic diagram of the structure of the output shaft provided in an embodiment of this disclosure.

[0029] The symbols in the diagram represent the following meanings:

[0030] 1. Cylinder; 101. Pilot oil passage; 1011. Pilot oil inlet section; 1012. Pilot oil flow section; 102. High-pressure oil inlet passage; 103. Return oil passage; 104. Pilot oil chamber; 105. High-pressure oil inlet chamber; 107. Drain passage; 1071. Connecting section; 1072. Drain section; 1061. Connecting inlet section; 1062. Connecting intermediate section; 11. First end cover; 12. Second end cover; 13. Cylinder body; 1301. First through hole; 1302. Second through hole; 1303. Third through hole; 1304. Threaded section; 14. Valve body; 140. Receiving groove; 15. Pressure plate; 150. Rotating hole; 151. Connecting part; 152. Insertion section; 1501. Displacement hole section; 1502. Snap-fit ​​section; 1503. Sealing groove;

[0031] 2. Piston; 201. Ring groove; 202. Connecting groove; 203. Protrusion;

[0032] 3. Output shaft; 31. Limiting convex ring; 32. Bearing; 310. Helical external spline teeth;

[0033] 5. Pilot oil control component; 500. Control oil passage; 501. Pilot oil inlet; 51. Nozzle; 511. First connecting post; 512. Second connecting post; 513. Spherical body; 52. Rotating arm; 521. Disc; 522. Rod; 53. Drive component;

[0034] 6. Flexible reset component. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0036] This disclosure provides a rotary hydraulic cylinder, such as... Figure 1 As shown, the rotary cylinder includes a cylinder barrel 1, a piston 2, and an output shaft 3. The cylinder barrel 1 has pilot oil passages 101, high-pressure oil inlet passages 102, and return oil passages 103 spaced apart from each other.

[0037] Piston 2 is movably located inside cylinder 1. The outer wall of piston 2 and the inner wall of cylinder 1 form a first rotating helical pair, and the first end of piston 2 and the inner wall of cylinder 1 form a pilot oil chamber 104. Pilot oil chamber 104 is connected to pilot oil passage 101. A high-pressure oil inlet chamber 105 is formed between the middle part of piston 2 and the inner wall of cylinder 1. Pilot oil chamber 104 and high-pressure oil inlet chamber 105 are arranged at intervals. Pilot oil chamber 104 and high-pressure oil inlet chamber 105 are used to drive piston 2 to switch from a first position to a second position.

[0038] When piston 2 is in the first position, the high-pressure oil inlet chamber 105 is connected to the high-pressure oil inlet channel 102, but the high-pressure oil inlet chamber 105 is not connected to the return oil channel 103. When piston 2 is in the second position, the high-pressure oil inlet chamber 105 is connected to the return oil channel 103.

[0039] The first end of the output shaft 3 is located in the second end of the piston 2, and a second rotary helical pair is formed between the output shaft 3 and the piston 2 with the opposite rotation direction to the first rotary helical pair. The second end of the output shaft 3 is located outside the cylinder 1 and is rotatably connected to the cylinder 1.

[0040] When using the rotary cylinder provided in this embodiment, since a pilot oil chamber 104 and a high-pressure oil inlet chamber 105 are formed between the cylinder 1 and the piston 2 respectively, when it is necessary to drive the piston 2 to move so that the output shaft 3 outputs torque, pilot oil can be filled into the pilot oil chamber 104 through the pilot oil channel 101, and high-pressure oil can be filled into the high-pressure oil inlet chamber 105 through the high-pressure oil inlet channel 102, so that the piston 2 gradually moves from the first position to the second position. During this process, the oil in the pilot oil chamber 104 and the high-pressure oil inlet chamber 105 can simultaneously drive the piston 2 to move while rotating, thereby driving the output shaft 3 to output torque. When the piston 2 is in the second position, since the high-pressure oil inlet chamber 105 is connected to the return oil channel 103, the oil pressure in the high-pressure oil inlet chamber 105 becomes zero, and the piston 2 is no longer driven by the high-pressure oil inlet chamber 105. At this time, the piston 2 can be pulled back to reset by external force (such as manually) so that the output shaft 3 can be driven to rotate again.

[0041] Since the pilot oil chamber 104 and the high-pressure oil inlet chamber 105 are two independent oil chambers, they do not affect each other. Therefore, during the process of driving the piston 2 to switch from the first position to the second position, oil can be introduced into the pilot oil chamber 104 at the same time as oil is introduced into the high-pressure oil inlet chamber 105. In this way, the movement state of the piston 2 can be adjusted by adjusting the state of the oil in the pilot oil chamber 104 without changing the state of the oil in the high-pressure oil inlet chamber 105, so that the output torque of the output shaft 3 is constant, thereby improving the output accuracy of the output shaft 3.

[0042] In other words, in this embodiment of the present disclosure, the piston 2 can be driven simultaneously by two independent pilot oil chambers 104 and high-pressure oil inlet chamber 105. While driving the piston 2, the state of the oil in the pilot oil chamber 104 is adjusted to improve the stability of the flow rate and pressure of the oil driving the piston 2, thereby ensuring that the output torque of the output shaft 3 meets the accuracy requirements.

[0043] See also Figure 1 Optionally, the rotary cylinder also includes a pilot oil control component 5, which is connected to one side of the cylinder barrel 1. The pilot oil control component 5 is movably connected to the cylinder barrel 1 so that the pilot oil inlet 501 of the pilot oil control component 5 is connected to or not connected to the pilot oil channel 101. When the pilot oil inlet 501 is not connected to the pilot oil channel 101, the pilot oil control component 5 blocks the pilot oil channel 101.

[0044] In the above implementation, the pilot oil control component 5 is used to control whether pilot oil is introduced into the pilot oil chamber 104. When it is necessary to adjust the oil pressure in the pilot oil chamber 104, the position of the pilot oil control component 5 relative to the cylinder 1 can be controlled so that the pilot oil inlet 501 is connected to the pilot oil passage 101 to introduce pilot oil into the pilot oil chamber 104, thereby increasing the oil pressure in the pilot oil chamber 104. If it is not necessary to introduce oil into the pilot oil chamber 104, and the pilot oil inlet 501 is not connected to the pilot oil passage 101, the pilot oil control component 5 blocks the pilot oil passage 101. Thus, the pilot oil control component 5 can maintain the pressure in the pilot oil chamber 104, so that the pressure in the pilot oil chamber 104 is a stable value to lock the position of the piston 2 and prevent the piston 2 from moving.

[0045] In other words, by setting the pilot oil control component 5, the oil pressure in the pilot oil chamber 104 can be controlled at any time, thereby adjusting the movement state of the piston 2. At the same time, the pilot oil chamber 104 can be pressure-maintained to lock the position of the piston 2.

[0046] See also Figure 1 Optionally, the cylinder 1 also has an oil drain passage 107, which is arranged at intervals with the pilot oil passage 101. When the pilot oil inlet 501 is not connected to the pilot oil passage 101, the pilot oil inlet 501 is connected to the oil drain passage 107.

[0047] In the above implementation, the oil drain channel 107 is used to drain and recover the oil introduced into the pilot oil control component 5 when it does not enter the pilot oil chamber 104.

[0048] Optionally, the oil drain passage 107 includes a connecting section 1071 and an oil drain section 1072, which are located on opposite sides of the axis of the piston 2. The connecting section 1071 and the pilot oil passage 101 are located on the same side of the piston 2 at intervals. When the high-pressure oil inlet chamber 105 is connected to the high-pressure oil inlet passage 102, the connecting section 1071 and the oil drain section 1072 are connected.

[0049] The connecting section 1071 and the pilot oil passage 101 are located on the same side of the piston 2 at intervals. When the pilot oil inlet 501 is not connected to the pilot oil passage 101, the connecting section 1071 is connected to the pilot oil inlet 501.

[0050] In the above implementation, the oil drain channel 107 is configured as a connecting section 1071 and an oil drain section 1072. This allows the pilot oil in the pilot oil inlet 501 to be discharged through the connecting section 1071 and the oil drain section 1072 when the high-pressure oil inlet chamber 105 is connected to the high-pressure oil inlet channel 102, that is, when the piston 2 moves from the first position to the second position. This avoids the need to frequently open and close the pilot oil control component 5 to control whether pilot oil is introduced into the pilot oil chamber 104, thus facilitating control and improving control efficiency.

[0051] Figure 2 This is a schematic diagram of the pilot oil control component provided in an embodiment of this disclosure, combined with... Figure 2 Optionally, the pilot oil control component 5 includes a nozzle 51, a rotating arm 52, and a drive component 53. The nozzle 51 has a control oil passage 500, one end of which is connected to the pilot oil inlet 501, and the other end of which faces the inlet of the pilot oil channel 101 or the inlet of the connecting section 1071. The nozzle 51 is slidably sealed to the side wall of the cylinder 1 where the inlet of the pilot oil channel 101 and the inlet of the connecting section 1071 are located. The nozzle 51 is connected to the rotating arm 52.

[0052] The rotating arm 52 is rotatably connected to the cylinder 1. The rotation axis of the rotating arm 52 is perpendicular to the axis of the inlet of the connecting section 1071 or the axis of the inlet of the pilot oil passage 101, and is also perpendicular to its own length direction. The driving component 53 is connected to the rotating arm 52 and is used to drive the rotating arm 52 to rotate.

[0053] In the above implementation, the nozzle 51 is used to connect the control oil passage 500 with the pilot oil passage 101 or the connecting section 1071. The rotating arm 52 is rotatably connected to the cylinder 1, and the driving member 53 is used to drive the rotating arm 52 to rotate, so as to control the connection between the control oil passage 500 and the pilot oil passage 101 or the connecting section 1071.

[0054] The axial direction of the rotation axis of the rotating arm 52 can be seen in [reference]. Figure 1 The direction of the center is b (perpendicular to the plane of the paper). The axial direction of the inlet of connecting segment 1071 can be found in [reference needed]. Figure 1 The axial direction of the inlet of the pilot oil passage 101 can be seen in the following direction: (a) Figure 1 The direction is c.

[0055] In this embodiment, the rotating arm 52 includes a disc-shaped body 521 and rod portions 522 located on opposite sides of the disc body 521. The axial direction of the disc body 521 is perpendicular to the length direction of the two rod portions 522. The cylinder 1 has a rotating hole. The disc body 521 is movably located within the rotating hole. The outer periphery of the disc body 521 slides in contact with the inner wall of the rotating hole. One of the two rod portions 522 is connected to the drive member 53, and the other of the two rod portions 522 is connected to the nozzle 51.

[0056] The diameter of the disc body 521 is φ8mm~φ10mm.

[0057] For example, the inlet of the pilot oil passage 101 and the inlet of the connecting section 1071 are located on the same spherical surface. The nozzle 51 includes a first connecting post 511, a second connecting post 512, and a spherical body 513 connected in sequence. The end of the first connecting post 511 away from the second connecting post 512 is coaxially connected to the other of the two rod portions 522. The outer diameter of the second connecting post 512 is larger than the outer diameter of the first connecting post 511. The spherical surface of the spherical body 513 is used for sliding contact with the cylinder 1, and the center of the sphere corresponding to the spherical surface of the spherical body 513 is located on the axis of the second connecting post 512 and the first connecting post 511. The spherical surface of the spherical body 513 is in sliding sealing contact with the spherical surfaces where the inlet of the pilot oil passage 101 and the inlet of the connecting section 1071 are located.

[0058] There are multiple pilot oil inlets 501, and multiple first connecting posts 511 are spaced apart on the outer periphery of the first connecting posts 511, all of which are connected to the control oil passage 500. The control oil passage 500 is straight, and its extension direction is perpendicular to the axis of rotation of the rotating arm 52. The control oil passage 500 is located along the axis of the first connecting posts 511, within the first connecting post 511, the second connecting post 512, and the spherical body 513. In this way, by controlling the rotation of the rotating arm 52, the other end of the control oil passage 500 can be easily aligned with the inlet of the pilot oil channel 101 or the inlet of the connecting section 1071.

[0059] When the rotating arm 52 rotates about an axis perpendicular to its length, the spherical body 513 in the nozzle 51 rotates with the rotating arm 52. When the outlet of the control oil passage 500 is aligned with the inlet of the pilot oil passage 101, the control oil passage 500 is connected to the pilot oil passage 101. When the control oil passage 500 is aligned with the connecting section 1071, the control oil passage 500 is connected to the connecting section 1071. At the same time, the spherical body 513 blocks the pilot oil passage 101 when the control oil passage 500 is not connected to the pilot oil passage 101.

[0060] The center of the disk 521 is concentric with the center of the sphere in the spherical solid 513.

[0061] In this embodiment, the driving component 53 is a motor, and the output shaft of the driving component 53 is connected to one of the two rods 522 in the rotating arm 52.

[0062] In this embodiment, the nozzle 51 and the rotating arm 52 can be an integral structural component, such as an independent jet valve. The jet valve can control the pressure of the pilot oil chamber 104. The pressure of the pilot oil chamber 104, combined with the pressure of the high-pressure inlet oil chamber 105, can jointly drive the piston 2 to produce a combined rotational and linear motion. When the jet valve is closed, it can act as a safety locking valve, preventing the piston 2 from moving. Therefore, the above configuration can improve the output angle accuracy and ensure safety and reliability.

[0063] Figure 3 This is a schematic diagram of the cylinder structure provided in the embodiments of this disclosure, combined with... Figure 3 Optionally, the pilot oil passage 101 includes a pilot oil inlet section 1011 and a pilot oil flow section 1012 that are interconnected. The end of the pilot oil inlet section 1011 away from the pilot oil flow section 1012 faces the control oil passage 500. The inner diameter of both the pilot oil inlet section 1011 and the control oil passage 500 is smaller than the inner diameter of the pilot oil flow section 1012.

[0064] In the above implementation, the pilot oil channel 101 is configured as a pilot oil inlet section 1011 and a pilot oil flow section 1012. The pilot oil inlet section 1011 can be connected to the control oil channel 500 so that the oil in the pilot oil control component 5 can enter the pilot oil chamber 104. The inner diameter of the pilot oil inlet section 1011 and the inner diameter of the control oil channel 500 are both smaller than the inner diameter of the pilot oil flow section 1012. In this way, the pressure of the oil entering the pilot oil chamber 104 can be limited by the smaller inner diameter of the control oil channel 500 and the pilot oil inlet section 1011, so that the pressure in the pilot oil chamber 104 will not increase significantly when the oil enters the pilot oil chamber 104.

[0065] Optionally, the connecting section 1071 includes a connecting inlet section 1061 and a connecting intermediate section 1062 that are interconnected. The end of the connecting inlet section 1061 away from the connecting intermediate section 1062 is used to connect with the control oil passage 500. The inner diameter of the connecting inlet section 1061 and the inner diameter of the control oil passage 500 are both smaller than the inner diameter of the connecting intermediate section 1062.

[0066] In the above implementation, the connecting segment 1071 is set as the connecting inlet segment 1061 and the connecting intermediate segment 1062. The connecting inlet segment 1061 can be connected to the control oil passage 500 so that the oil in the pilot oil control component 5 can be discharged through the oil drain passage 107.

[0067] The inner diameters of the connecting inlet section 1061 and the control oil passage 500 are both smaller than the inner diameter of the connecting intermediate section 1062. This allows the pressure of the oil discharged from the control oil passage 500 to be limited by the smaller inner diameter of the control oil passage 500 and the connecting inlet section 1061.

[0068] In this embodiment, the inlet of the connecting inlet section 1061 and the inlet of the pilot oil inlet section 1011 are located on the same spherical surface of the cylinder 1, and the angle between the position of the spherical surface where the inlet of the connecting inlet section 1061 and the inlet of the pilot oil inlet section 1011 are located and the center of the sphere is no greater than 30° (that is...). Figure 1 (The acute angle formed between the central axis a and the axis c). This allows the pilot oil control component 5 to freely switch between the state where the control oil passage 500 is connected to the connecting inlet section 1061 and the state where the control oil passage 500 is connected to the pilot oil inlet section 1011 after rotating a very small angle.

[0069] See also Figure 3 Optionally, the cylinder 1 includes a first end cap 11, a second end cap 12, and a cylinder body 13. The first end cap 11 and the second end cap 12 are detachably connected to the opposite ends of the cylinder body 13 along the length of the piston 2.

[0070] In the above implementation, the cylinder 1 is configured with the above structure, so that it can be detachably connected to the cylinder body 13 through the first end cover 11 and the second end cover 12 respectively, making the cylinder 1 a detachable structure, which facilitates the assembly of the piston 2, output shaft 3, etc.

[0071] A sealing ring is installed between the first end cap 11 and the cylinder body 13, and a sealing ring is also installed between the second end cap 12 and the cylinder body 13, which can improve the sealing performance of the cylinder body 13.

[0072] Optionally, the cylinder 1 further includes a valve body 14 and a pressure plate 15. The valve body 14 is located outside the cylinder body 13 and connected to the outer wall of the cylinder body 13. The side wall of the valve body 14 away from the cylinder body 13 has a receiving groove 140. The pressure plate 15 covers the opening of the receiving groove 140 and is connected to the cylinder body 13. A rotating hole 150 is located in the pressure plate 15. A pilot oil control element 5 is located in the receiving groove 140 and is rotatably connected to the pressure plate 15.

[0073] In the above implementation, the valve body 14 and pressure plate 15, etc., can be installed on the cylinder 1 to mount the pilot oil control component 5.

[0074] Figure 4 This is a schematic diagram of the valve body provided in an embodiment of the present disclosure, combined with... Figure 4 In this embodiment, both the connecting inlet section 1061 and the pilot oil inlet section 1011 are located in the valve body 14. The valve body 14 is connected to the side wall of the cylinder body 13 by fasteners such as screws.

[0075] Figure 5 This is a schematic diagram of the structure of the pressure plate provided in the embodiments of this disclosure, combined with... Figure 5 To facilitate the positioning and assembly of the pressure plate and the valve body 14, the pressure plate 15 includes a plate-shaped connecting portion 151 and a cylindrical insertion section 152. One end of the insertion section 152 is connected to the connecting portion 151, and the other end of the insertion section 152 is sealed and inserted into the receiving groove 140 of the valve body 14. The connecting portion 151 is connected to the valve body 14 by fasteners such as screws.

[0076] The rotating hole 150 includes a rectangular clearance section 1501 and a retaining section 1502 with an arcuate surface. The clearance section 1501 and the retaining section 1502 are interconnected. The width of the clearance section 1501 along the length of the piston 2 is greater than the diameter of the disc 521. The center of the arcuate surface in the retaining section 1502 is concentric with the center of the disc 521. The diameter of the arcuate surface in the retaining section 1502 is the same as the diameter of the disc 521. This prevents the rod 522 from colliding with the rotating hole 150 during swinging.

[0077] The pressure plate 15 also has a sealing groove 1503 on the side facing the valve body 14. The sealing groove 1503 is located outside the insertion section 152 and a sealing ring is installed in the sealing groove 1503.

[0078] See also Figure 3In this embodiment, to facilitate the installation of various components and the setting of oil passages, the cylinder body 13 has a first through hole 1301, a second through hole 1302, and a third through hole 1303 connected in sequence in the middle. The inner diameter of the second through hole 1302 is smaller than the inner diameters of the first through hole 1301 and the third through hole 1303. The middle section of the first through hole 1301 is provided with a trapezoidal internal thread section 1304. The piston 2 is movably located in the first through hole 1301, and the outer wall of the piston 2 has a trapezoidal external thread section that mates with the internal thread section to form a first rotating helical pair. The portion of the outer wall of the piston 2 without a threaded section is in sliding sealing contact with the portion of the inner wall of the first through hole 1301 without a threaded section. The elastic reset member 6 (described below) is also located in the first through hole 1301, and one end abuts against the inner wall of the first through hole 1301.

[0079] The pilot oil flow section 1012, high-pressure oil inlet channel 102, return oil channel 103, connecting section 1071, and drain section 1072 are all located in the cylinder block 13, and all of these sections are connected to the first through hole 1301. Specifically, the pilot oil flow section 1012 and connecting section 1071 are located on one side of the length direction of the first through hole 1301, while the high-pressure oil inlet channel 102, return oil channel 103, and drain section 1072 are located on the other side of the length direction of the first through hole 1301. The high-pressure oil inlet channel 102, return oil channel 103, connecting section 1071, and drain section 1072 are all straight channels and extend radially along the first through hole 1301.

[0080] Figure 6 This is a schematic diagram of the piston structure provided in an embodiment of the present disclosure, combined with... Figure 6 Optionally, the outer wall of piston 2 has an annular groove 201, the center of which is located on the central axis of piston 2.

[0081] When the high-pressure oil inlet chamber 105 is connected to the high-pressure oil inlet channel 102, the annular groove 201 is connected to the connecting section 1071 and the drain section 1072 respectively.

[0082] In the above implementation, the annular groove 201 is used to connect the connecting section 1071 and the drain section 1072 so that the oil in the pilot oil control component 5 can be discharged through the drain section 1072 without entering the pilot oil chamber 104.

[0083] Optionally, the outer wall of the piston 2 has an annular connecting groove 202, the center of which is located on the central axis of the piston 2. A high-pressure oil inlet chamber 105 is formed between the connecting groove 202 and the cylinder 1.

[0084] In the above implementation, a connecting groove 202 is provided on the outer wall of the piston 2, so that the connecting groove 202 can be connected to the high-pressure oil inlet channel 102 or the oil return channel 103 when the piston 2 is in different positions.

[0085] In this embodiment, the annular groove 201 and the connecting groove 202 are arranged at intervals along the length direction of the piston 2, with the annular groove 201 close to the second end of the piston 2 and the connecting groove 202 close to the first end of the piston 2.

[0086] A protrusion 203 is formed between the connecting groove 202 and the annular groove 201. The protrusion 203 is used to block the oil return passage 103 when the piston 2 is in the first position.

[0087] Figure 7 This is a schematic diagram of the output shaft provided in an embodiment of the present disclosure, combined with... Figure 7 Optionally, the outer wall of the output shaft 3 has an annular limiting protrusion 31, and the two sides of the limiting protrusion 31 are clamped in the cylinder 1 by bearings 32 in the length direction of the output shaft 3.

[0088] In the above implementation, the limiting protrusion 31 is used to cooperate with the bearing 32 so that the output shaft 3 will not move axially, but can only rotate. The bearing 32 is a planar thrust bearing.

[0089] In this embodiment, the outer wall of the output shaft 3 near the first end is provided with a helical external spline 310, and the inner wall of the piston 2 is provided with a helical internal spline that cooperates with the helical external spline 310 of the outer wall of the output shaft 3 to form a second rotating helical pair.

[0090] See you again Figure 1 Optionally, the rotary cylinder also includes an elastic reset member 6, which is located inside the cylinder 1 and sleeved outside the output shaft 3. The two ends of the elastic reset member 6 are clamped between the second end of the piston 2 and the cylinder 1. The elastic reset member 6 is used to drive the piston 2 to switch from the first position to the second position.

[0091] In the above implementation, the elastic reset member 6 is used to push the piston 2 from the second position to the first position when the high pressure oil inlet chamber 105 and the pilot oil chamber 104 are draining oil, so that the output shaft 3 outputs a reverse torque.

[0092] In this embodiment, the elastic reset element 6 is a telescopic spring.

[0093] The following is a brief introduction to the installation and operation process of the rotary hydraulic cylinder provided in the embodiments of this disclosure:

[0094] First, the elastic reset member 6 is installed in the first through hole 1301 of the cylinder body 13, and then the piston 2 is installed in the first through hole 1301, so that the piston 2 and the cylinder body 13 form a first rotating helical pair.

[0095] Then, a bearing 32 is installed at each of the left and right ends of the limiting protrusion 31 of the output shaft 3. The output shaft 3 is then inserted into the third through hole 1303 of the cylinder body 13, so that the output shaft 3 meshes with the piston 2 to form a second rotating helical pair. Subsequently, the first end cover 11 and the second end cover 12 are installed.

[0096] Finally, the valve body 14 is mounted on the cylinder body 13 with screws, and the nozzle 51 is inserted into the rotating hole of the pressure plate 15. Then, the control oil passage 500 is aligned with the inlet of the connecting inlet section 1061. Finally, the pressure plate 15 and the valve body 14 are pressed together to form a sealed assembly.

[0097] During operation, in the initial position, the high-pressure oil inlet channel 102 and the high-pressure oil inlet chamber 105 are connected. The outer wall of piston 2 covers the return oil channel 103. High-pressure oil is introduced into the high-pressure oil inlet channel 102 and pressurized into the high-pressure oil inlet chamber 105. Pilot oil enters the control oil passage 500 of the pilot oil control component 5 through the pilot oil inlet 501. When the control oil passage 500 is aligned with the connecting inlet section 1061, the oil in the pilot oil control component 5 is directly discharged through the drain section 1072, and the oil in the pilot oil control component 5 does not enter the pilot oil chamber 104. However, if the pilot oil chamber 104 and the pilot oil channel 101 are full of oil at this time, the pilot oil chamber 104 still applies pressure to piston 2 to lock the position of piston 2.

[0098] When the control oil passage 500 is aligned with the pilot oil inlet section 1011, the pilot oil enters the pilot oil chamber 104. The pilot oil and the high-pressure oil work together to push the piston 2 to overcome the elastic reset member 6 and move and rotate. At this time, the output shaft 3 is supported by the thrust of the piston 2 and the axial positioning of the bearing 32 to output torque until a gap is formed between the protrusion 203 of the piston 2 and the return oil passage 103. The high-pressure oil returns after passing through the return oil passage 103.

[0099] After the hydraulic cylinder is rotated to release pressure, the elastic reset component 6 pushes the piston 2 to reset.

[0100] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A rotary hydraulic cylinder, characterized in that, The rotary cylinder includes a cylinder barrel (1), a piston (2), an output shaft (3), and a pilot oil control component (5). The cylinder barrel (1) has mutually spaced pilot oil channels (101), high-pressure oil inlet channels (102), oil return channels (103), and oil drain channels (107). The oil drain channels (107) include a connecting section (1071) and an oil drain section (1072). The piston (2) is movably located inside the cylinder (1). The outer wall of the piston (2) and the inner wall of the cylinder (1) form a first rotating helical pair. The first end of the piston (2) and the inner wall of the cylinder (1) form a pilot oil chamber (104). The pilot oil chamber (104) is connected to the pilot oil channel (101). The middle part of the piston (2) and the inner wall of the cylinder (1) form a high-pressure oil inlet chamber (105). The pilot oil chamber (104) and the high-pressure oil inlet chamber (105) are connected. The pilot oil chamber (104) and the high-pressure oil inlet chamber (105) are arranged at intervals to drive the piston (2) to switch from a first position to a second position. When the piston (2) is in the first position, the high-pressure oil inlet chamber (105) is connected to the high-pressure oil inlet channel (102), and the high-pressure oil inlet chamber (105) is not connected to the return oil channel (103). When the piston (2) is in the second position, the high-pressure oil inlet chamber (105) is connected to the return oil channel (103). The first end of the output shaft (3) is located in the second end of the piston (2), and a second rotating helical pair opposite to the first rotating helical pair is formed between the output shaft (3) and the piston (2), and the second end of the output shaft (3) is located outside the cylinder (1); The pilot oil control component (5) is movably connected to the cylinder (1) such that the pilot oil inlet (501) of the pilot oil control component (5) is connected to or not connected to the pilot oil passage (101). When the pilot oil inlet (501) is not connected to the pilot oil passage (101), the pilot oil control component (5) blocks the pilot oil passage (101). The pilot oil control component (5) includes a nozzle (51), a rotating arm (52), and a drive component (53). The nozzle (51) has a control oil passage (500). One end of the control oil passage (500) is connected to the pilot oil inlet (501). The other end of the nozzle (51) is oriented toward the inlet of the pilot oil channel (101) or the inlet of the connecting section (1071); the nozzle (51) is slidably sealed to the side wall of the cylinder (1) where the inlet of the pilot oil channel (101) and the inlet of the connecting section (1071) are located; the rotating arm (52) is connected to the nozzle (51), the rotating arm (52) is rotatably connected to the cylinder (1), and the rotation axis of the rotating arm (52) is perpendicular to the axis of the inlet of the connecting section (1071); the driving member (53) is connected to the rotating arm (52), and the driving member (53) is used to drive the rotating arm (52) to rotate.

2. The rotary cylinder according to claim 1, characterized in that, The drain channel (107) is arranged at intervals with the pilot oil channel (101), and when the pilot oil inlet (501) is not connected to the pilot oil channel (101), the pilot oil inlet (501) is connected to the drain channel (107).

3. The rotary cylinder according to claim 2, characterized in that, The connecting section (1071) and the drain section (1072) are located on opposite sides of the axis of the piston (2), and the connecting section (1071) and the drain section (1072) are connected when the high pressure oil inlet chamber (105) is connected to the high pressure oil inlet channel (102). The connecting section (1071) and the pilot oil passage (101) are located on the same side of the piston (2) at intervals. When the pilot oil inlet (501) and the pilot oil passage (101) are not connected, the connecting section (1071) is connected to the pilot oil inlet (501).

4. The rotary cylinder according to claim 1, characterized in that, The pilot oil passage (101) includes a pilot oil inlet section (1011) and a pilot oil flow section (1012) that are interconnected. The end of the pilot oil inlet section (1011) away from the pilot oil flow section (1012) faces the control oil passage (500). The inner diameter of the pilot oil inlet section (1011) and the inner diameter of the control oil passage (500) are both smaller than the inner diameter of the pilot oil flow section (1012).

5. The rotary cylinder according to claim 3, characterized in that, The outer wall of the piston (2) has an annular groove (201), the center of which is located on the central axis of the piston (2); When the high-pressure oil inlet chamber (105) is connected to the high-pressure oil inlet channel (102), the annular groove (201) is connected to the connecting section (1071) and the drain section (1072) respectively.

6. The rotary cylinder according to any one of claims 1-5, characterized in that, The outer wall of the piston (2) has an annular connecting groove (202), the center of which is located on the central axis of the piston (2), and the high-pressure oil inlet chamber (105) is formed between the connecting groove (202) and the inner wall of the cylinder (1).

7. The rotary cylinder according to any one of claims 1-5, characterized in that, The rotary cylinder also includes an elastic reset member (6), which is located inside the cylinder (1) and sleeved outside the output shaft (3). The two ends of the elastic reset member (6) are clamped between the second end of the piston (2) and the cylinder (1).

8. The rotary cylinder according to any one of claims 1-5, characterized in that, The cylinder (1) includes a first end cap (11), a second end cap (12) and a cylinder body (13), wherein the first end cap (11) and the second end cap (12) are detachably connected to the opposite ends of the cylinder body (13).

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